| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <getopt.h> |
| #include <uuid/uuid.h> |
| #include "ctree.h" |
| #include "volumes.h" |
| #include "repair.h" |
| #include "disk-io.h" |
| #include "print-tree.h" |
| #include "task-utils.h" |
| #include "transaction.h" |
| #include "utils.h" |
| #include "commands.h" |
| #include "free-space-cache.h" |
| #include "free-space-tree.h" |
| #include "btrfsck.h" |
| #include "qgroup-verify.h" |
| #include "rbtree-utils.h" |
| #include "backref.h" |
| #include "kernel-shared/ulist.h" |
| #include "hash.h" |
| #include "help.h" |
| |
| enum task_position { |
| TASK_EXTENTS, |
| TASK_FREE_SPACE, |
| TASK_FS_ROOTS, |
| TASK_NOTHING, /* have to be the last element */ |
| }; |
| |
| struct task_ctx { |
| int progress_enabled; |
| enum task_position tp; |
| |
| struct task_info *info; |
| }; |
| |
| static u64 bytes_used = 0; |
| static u64 total_csum_bytes = 0; |
| static u64 total_btree_bytes = 0; |
| static u64 total_fs_tree_bytes = 0; |
| static u64 total_extent_tree_bytes = 0; |
| static u64 btree_space_waste = 0; |
| static u64 data_bytes_allocated = 0; |
| static u64 data_bytes_referenced = 0; |
| static int found_old_backref = 0; |
| static LIST_HEAD(duplicate_extents); |
| static LIST_HEAD(delete_items); |
| static int no_holes = 0; |
| static int init_extent_tree = 0; |
| static int check_data_csum = 0; |
| static struct btrfs_fs_info *global_info; |
| static struct task_ctx ctx = { 0 }; |
| static struct cache_tree *roots_info_cache = NULL; |
| |
| enum btrfs_check_mode { |
| CHECK_MODE_ORIGINAL, |
| CHECK_MODE_LOWMEM, |
| CHECK_MODE_UNKNOWN, |
| CHECK_MODE_DEFAULT = CHECK_MODE_ORIGINAL |
| }; |
| |
| static enum btrfs_check_mode check_mode = CHECK_MODE_DEFAULT; |
| |
| struct extent_backref { |
| struct list_head list; |
| unsigned int is_data:1; |
| unsigned int found_extent_tree:1; |
| unsigned int full_backref:1; |
| unsigned int found_ref:1; |
| unsigned int broken:1; |
| }; |
| |
| static inline struct extent_backref* to_extent_backref(struct list_head *entry) |
| { |
| return list_entry(entry, struct extent_backref, list); |
| } |
| |
| struct data_backref { |
| struct extent_backref node; |
| union { |
| u64 parent; |
| u64 root; |
| }; |
| u64 owner; |
| u64 offset; |
| u64 disk_bytenr; |
| u64 bytes; |
| u64 ram_bytes; |
| u32 num_refs; |
| u32 found_ref; |
| }; |
| |
| #define ROOT_DIR_ERROR (1<<1) /* bad ROOT_DIR */ |
| #define DIR_ITEM_MISSING (1<<2) /* DIR_ITEM not found */ |
| #define DIR_ITEM_MISMATCH (1<<3) /* DIR_ITEM found but not match */ |
| #define INODE_REF_MISSING (1<<4) /* INODE_REF/INODE_EXTREF not found */ |
| #define INODE_ITEM_MISSING (1<<5) /* INODE_ITEM not found */ |
| #define INODE_ITEM_MISMATCH (1<<6) /* INODE_ITEM found but not match */ |
| #define FILE_EXTENT_ERROR (1<<7) /* bad FILE_EXTENT */ |
| #define ODD_CSUM_ITEM (1<<8) /* CSUM_ITEM error */ |
| #define CSUM_ITEM_MISSING (1<<9) /* CSUM_ITEM not found */ |
| #define LINK_COUNT_ERROR (1<<10) /* INODE_ITEM nlink count error */ |
| #define NBYTES_ERROR (1<<11) /* INODE_ITEM nbytes count error */ |
| #define ISIZE_ERROR (1<<12) /* INODE_ITEM size count error */ |
| #define ORPHAN_ITEM (1<<13) /* INODE_ITEM no reference */ |
| #define NO_INODE_ITEM (1<<14) /* no inode_item */ |
| #define LAST_ITEM (1<<15) /* Complete this tree traversal */ |
| #define ROOT_REF_MISSING (1<<16) /* ROOT_REF not found */ |
| #define ROOT_REF_MISMATCH (1<<17) /* ROOT_REF found but not match */ |
| |
| static inline struct data_backref* to_data_backref(struct extent_backref *back) |
| { |
| return container_of(back, struct data_backref, node); |
| } |
| |
| /* |
| * Much like data_backref, just removed the undetermined members |
| * and change it to use list_head. |
| * During extent scan, it is stored in root->orphan_data_extent. |
| * During fs tree scan, it is then moved to inode_rec->orphan_data_extents. |
| */ |
| struct orphan_data_extent { |
| struct list_head list; |
| u64 root; |
| u64 objectid; |
| u64 offset; |
| u64 disk_bytenr; |
| u64 disk_len; |
| }; |
| |
| struct tree_backref { |
| struct extent_backref node; |
| union { |
| u64 parent; |
| u64 root; |
| }; |
| }; |
| |
| static inline struct tree_backref* to_tree_backref(struct extent_backref *back) |
| { |
| return container_of(back, struct tree_backref, node); |
| } |
| |
| /* Explicit initialization for extent_record::flag_block_full_backref */ |
| enum { FLAG_UNSET = 2 }; |
| |
| struct extent_record { |
| struct list_head backrefs; |
| struct list_head dups; |
| struct list_head list; |
| struct cache_extent cache; |
| struct btrfs_disk_key parent_key; |
| u64 start; |
| u64 max_size; |
| u64 nr; |
| u64 refs; |
| u64 extent_item_refs; |
| u64 generation; |
| u64 parent_generation; |
| u64 info_objectid; |
| u32 num_duplicates; |
| u8 info_level; |
| unsigned int flag_block_full_backref:2; |
| unsigned int found_rec:1; |
| unsigned int content_checked:1; |
| unsigned int owner_ref_checked:1; |
| unsigned int is_root:1; |
| unsigned int metadata:1; |
| unsigned int bad_full_backref:1; |
| unsigned int crossing_stripes:1; |
| unsigned int wrong_chunk_type:1; |
| }; |
| |
| static inline struct extent_record* to_extent_record(struct list_head *entry) |
| { |
| return container_of(entry, struct extent_record, list); |
| } |
| |
| struct inode_backref { |
| struct list_head list; |
| unsigned int found_dir_item:1; |
| unsigned int found_dir_index:1; |
| unsigned int found_inode_ref:1; |
| u8 filetype; |
| u8 ref_type; |
| int errors; |
| u64 dir; |
| u64 index; |
| u16 namelen; |
| char name[0]; |
| }; |
| |
| static inline struct inode_backref* to_inode_backref(struct list_head *entry) |
| { |
| return list_entry(entry, struct inode_backref, list); |
| } |
| |
| struct root_item_record { |
| struct list_head list; |
| u64 objectid; |
| u64 bytenr; |
| u64 last_snapshot; |
| u8 level; |
| u8 drop_level; |
| int level_size; |
| struct btrfs_key drop_key; |
| }; |
| |
| #define REF_ERR_NO_DIR_ITEM (1 << 0) |
| #define REF_ERR_NO_DIR_INDEX (1 << 1) |
| #define REF_ERR_NO_INODE_REF (1 << 2) |
| #define REF_ERR_DUP_DIR_ITEM (1 << 3) |
| #define REF_ERR_DUP_DIR_INDEX (1 << 4) |
| #define REF_ERR_DUP_INODE_REF (1 << 5) |
| #define REF_ERR_INDEX_UNMATCH (1 << 6) |
| #define REF_ERR_FILETYPE_UNMATCH (1 << 7) |
| #define REF_ERR_NAME_TOO_LONG (1 << 8) // 100 |
| #define REF_ERR_NO_ROOT_REF (1 << 9) |
| #define REF_ERR_NO_ROOT_BACKREF (1 << 10) |
| #define REF_ERR_DUP_ROOT_REF (1 << 11) |
| #define REF_ERR_DUP_ROOT_BACKREF (1 << 12) |
| |
| struct file_extent_hole { |
| struct rb_node node; |
| u64 start; |
| u64 len; |
| }; |
| |
| struct inode_record { |
| struct list_head backrefs; |
| unsigned int checked:1; |
| unsigned int merging:1; |
| unsigned int found_inode_item:1; |
| unsigned int found_dir_item:1; |
| unsigned int found_file_extent:1; |
| unsigned int found_csum_item:1; |
| unsigned int some_csum_missing:1; |
| unsigned int nodatasum:1; |
| int errors; |
| |
| u64 ino; |
| u32 nlink; |
| u32 imode; |
| u64 isize; |
| u64 nbytes; |
| |
| u32 found_link; |
| u64 found_size; |
| u64 extent_start; |
| u64 extent_end; |
| struct rb_root holes; |
| struct list_head orphan_extents; |
| |
| u32 refs; |
| }; |
| |
| #define I_ERR_NO_INODE_ITEM (1 << 0) |
| #define I_ERR_NO_ORPHAN_ITEM (1 << 1) |
| #define I_ERR_DUP_INODE_ITEM (1 << 2) |
| #define I_ERR_DUP_DIR_INDEX (1 << 3) |
| #define I_ERR_ODD_DIR_ITEM (1 << 4) |
| #define I_ERR_ODD_FILE_EXTENT (1 << 5) |
| #define I_ERR_BAD_FILE_EXTENT (1 << 6) |
| #define I_ERR_FILE_EXTENT_OVERLAP (1 << 7) |
| #define I_ERR_FILE_EXTENT_DISCOUNT (1 << 8) // 100 |
| #define I_ERR_DIR_ISIZE_WRONG (1 << 9) |
| #define I_ERR_FILE_NBYTES_WRONG (1 << 10) // 400 |
| #define I_ERR_ODD_CSUM_ITEM (1 << 11) |
| #define I_ERR_SOME_CSUM_MISSING (1 << 12) |
| #define I_ERR_LINK_COUNT_WRONG (1 << 13) |
| #define I_ERR_FILE_EXTENT_ORPHAN (1 << 14) |
| |
| struct root_backref { |
| struct list_head list; |
| unsigned int found_dir_item:1; |
| unsigned int found_dir_index:1; |
| unsigned int found_back_ref:1; |
| unsigned int found_forward_ref:1; |
| unsigned int reachable:1; |
| int errors; |
| u64 ref_root; |
| u64 dir; |
| u64 index; |
| u16 namelen; |
| char name[0]; |
| }; |
| |
| static inline struct root_backref* to_root_backref(struct list_head *entry) |
| { |
| return list_entry(entry, struct root_backref, list); |
| } |
| |
| struct root_record { |
| struct list_head backrefs; |
| struct cache_extent cache; |
| unsigned int found_root_item:1; |
| u64 objectid; |
| u32 found_ref; |
| }; |
| |
| struct ptr_node { |
| struct cache_extent cache; |
| void *data; |
| }; |
| |
| struct shared_node { |
| struct cache_extent cache; |
| struct cache_tree root_cache; |
| struct cache_tree inode_cache; |
| struct inode_record *current; |
| u32 refs; |
| }; |
| |
| struct block_info { |
| u64 start; |
| u32 size; |
| }; |
| |
| struct walk_control { |
| struct cache_tree shared; |
| struct shared_node *nodes[BTRFS_MAX_LEVEL]; |
| int active_node; |
| int root_level; |
| }; |
| |
| struct bad_item { |
| struct btrfs_key key; |
| u64 root_id; |
| struct list_head list; |
| }; |
| |
| struct extent_entry { |
| u64 bytenr; |
| u64 bytes; |
| int count; |
| int broken; |
| struct list_head list; |
| }; |
| |
| struct root_item_info { |
| /* level of the root */ |
| u8 level; |
| /* number of nodes at this level, must be 1 for a root */ |
| int node_count; |
| u64 bytenr; |
| u64 gen; |
| struct cache_extent cache_extent; |
| }; |
| |
| /* |
| * Error bit for low memory mode check. |
| * |
| * Currently no caller cares about it yet. Just internal use for error |
| * classification. |
| */ |
| #define BACKREF_MISSING (1 << 0) /* Backref missing in extent tree */ |
| #define BACKREF_MISMATCH (1 << 1) /* Backref exists but does not match */ |
| #define BYTES_UNALIGNED (1 << 2) /* Some bytes are not aligned */ |
| #define REFERENCER_MISSING (1 << 3) /* Referencer not found */ |
| #define REFERENCER_MISMATCH (1 << 4) /* Referenceer found but does not match */ |
| #define CROSSING_STRIPE_BOUNDARY (1 << 4) /* For kernel scrub workaround */ |
| #define ITEM_SIZE_MISMATCH (1 << 5) /* Bad item size */ |
| #define UNKNOWN_TYPE (1 << 6) /* Unknown type */ |
| #define ACCOUNTING_MISMATCH (1 << 7) /* Used space accounting error */ |
| #define CHUNK_TYPE_MISMATCH (1 << 8) |
| |
| static void *print_status_check(void *p) |
| { |
| struct task_ctx *priv = p; |
| const char work_indicator[] = { '.', 'o', 'O', 'o' }; |
| uint32_t count = 0; |
| static char *task_position_string[] = { |
| "checking extents", |
| "checking free space cache", |
| "checking fs roots", |
| }; |
| |
| task_period_start(priv->info, 1000 /* 1s */); |
| |
| if (priv->tp == TASK_NOTHING) |
| return NULL; |
| |
| while (1) { |
| printf("%s [%c]\r", task_position_string[priv->tp], |
| work_indicator[count % 4]); |
| count++; |
| fflush(stdout); |
| task_period_wait(priv->info); |
| } |
| return NULL; |
| } |
| |
| static int print_status_return(void *p) |
| { |
| printf("\n"); |
| fflush(stdout); |
| |
| return 0; |
| } |
| |
| static enum btrfs_check_mode parse_check_mode(const char *str) |
| { |
| if (strcmp(str, "lowmem") == 0) |
| return CHECK_MODE_LOWMEM; |
| if (strcmp(str, "orig") == 0) |
| return CHECK_MODE_ORIGINAL; |
| if (strcmp(str, "original") == 0) |
| return CHECK_MODE_ORIGINAL; |
| |
| return CHECK_MODE_UNKNOWN; |
| } |
| |
| /* Compatible function to allow reuse of old codes */ |
| static u64 first_extent_gap(struct rb_root *holes) |
| { |
| struct file_extent_hole *hole; |
| |
| if (RB_EMPTY_ROOT(holes)) |
| return (u64)-1; |
| |
| hole = rb_entry(rb_first(holes), struct file_extent_hole, node); |
| return hole->start; |
| } |
| |
| static int compare_hole(struct rb_node *node1, struct rb_node *node2) |
| { |
| struct file_extent_hole *hole1; |
| struct file_extent_hole *hole2; |
| |
| hole1 = rb_entry(node1, struct file_extent_hole, node); |
| hole2 = rb_entry(node2, struct file_extent_hole, node); |
| |
| if (hole1->start > hole2->start) |
| return -1; |
| if (hole1->start < hole2->start) |
| return 1; |
| /* Now hole1->start == hole2->start */ |
| if (hole1->len >= hole2->len) |
| /* |
| * Hole 1 will be merge center |
| * Same hole will be merged later |
| */ |
| return -1; |
| /* Hole 2 will be merge center */ |
| return 1; |
| } |
| |
| /* |
| * Add a hole to the record |
| * |
| * This will do hole merge for copy_file_extent_holes(), |
| * which will ensure there won't be continuous holes. |
| */ |
| static int add_file_extent_hole(struct rb_root *holes, |
| u64 start, u64 len) |
| { |
| struct file_extent_hole *hole; |
| struct file_extent_hole *prev = NULL; |
| struct file_extent_hole *next = NULL; |
| |
| hole = malloc(sizeof(*hole)); |
| if (!hole) |
| return -ENOMEM; |
| hole->start = start; |
| hole->len = len; |
| /* Since compare will not return 0, no -EEXIST will happen */ |
| rb_insert(holes, &hole->node, compare_hole); |
| |
| /* simple merge with previous hole */ |
| if (rb_prev(&hole->node)) |
| prev = rb_entry(rb_prev(&hole->node), struct file_extent_hole, |
| node); |
| if (prev && prev->start + prev->len >= hole->start) { |
| hole->len = hole->start + hole->len - prev->start; |
| hole->start = prev->start; |
| rb_erase(&prev->node, holes); |
| free(prev); |
| prev = NULL; |
| } |
| |
| /* iterate merge with next holes */ |
| while (1) { |
| if (!rb_next(&hole->node)) |
| break; |
| next = rb_entry(rb_next(&hole->node), struct file_extent_hole, |
| node); |
| if (hole->start + hole->len >= next->start) { |
| if (hole->start + hole->len <= next->start + next->len) |
| hole->len = next->start + next->len - |
| hole->start; |
| rb_erase(&next->node, holes); |
| free(next); |
| next = NULL; |
| } else |
| break; |
| } |
| return 0; |
| } |
| |
| static int compare_hole_range(struct rb_node *node, void *data) |
| { |
| struct file_extent_hole *hole; |
| u64 start; |
| |
| hole = (struct file_extent_hole *)data; |
| start = hole->start; |
| |
| hole = rb_entry(node, struct file_extent_hole, node); |
| if (start < hole->start) |
| return -1; |
| if (start >= hole->start && start < hole->start + hole->len) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Delete a hole in the record |
| * |
| * This will do the hole split and is much restrict than add. |
| */ |
| static int del_file_extent_hole(struct rb_root *holes, |
| u64 start, u64 len) |
| { |
| struct file_extent_hole *hole; |
| struct file_extent_hole tmp; |
| u64 prev_start = 0; |
| u64 prev_len = 0; |
| u64 next_start = 0; |
| u64 next_len = 0; |
| struct rb_node *node; |
| int have_prev = 0; |
| int have_next = 0; |
| int ret = 0; |
| |
| tmp.start = start; |
| tmp.len = len; |
| node = rb_search(holes, &tmp, compare_hole_range, NULL); |
| if (!node) |
| return -EEXIST; |
| hole = rb_entry(node, struct file_extent_hole, node); |
| if (start + len > hole->start + hole->len) |
| return -EEXIST; |
| |
| /* |
| * Now there will be no overlap, delete the hole and re-add the |
| * split(s) if they exists. |
| */ |
| if (start > hole->start) { |
| prev_start = hole->start; |
| prev_len = start - hole->start; |
| have_prev = 1; |
| } |
| if (hole->start + hole->len > start + len) { |
| next_start = start + len; |
| next_len = hole->start + hole->len - start - len; |
| have_next = 1; |
| } |
| rb_erase(node, holes); |
| free(hole); |
| if (have_prev) { |
| ret = add_file_extent_hole(holes, prev_start, prev_len); |
| if (ret < 0) |
| return ret; |
| } |
| if (have_next) { |
| ret = add_file_extent_hole(holes, next_start, next_len); |
| if (ret < 0) |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int copy_file_extent_holes(struct rb_root *dst, |
| struct rb_root *src) |
| { |
| struct file_extent_hole *hole; |
| struct rb_node *node; |
| int ret = 0; |
| |
| node = rb_first(src); |
| while (node) { |
| hole = rb_entry(node, struct file_extent_hole, node); |
| ret = add_file_extent_hole(dst, hole->start, hole->len); |
| if (ret) |
| break; |
| node = rb_next(node); |
| } |
| return ret; |
| } |
| |
| static void free_file_extent_holes(struct rb_root *holes) |
| { |
| struct rb_node *node; |
| struct file_extent_hole *hole; |
| |
| node = rb_first(holes); |
| while (node) { |
| hole = rb_entry(node, struct file_extent_hole, node); |
| rb_erase(node, holes); |
| free(hole); |
| node = rb_first(holes); |
| } |
| } |
| |
| static void reset_cached_block_groups(struct btrfs_fs_info *fs_info); |
| |
| static void record_root_in_trans(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root) |
| { |
| if (root->last_trans != trans->transid) { |
| root->track_dirty = 1; |
| root->last_trans = trans->transid; |
| root->commit_root = root->node; |
| extent_buffer_get(root->node); |
| } |
| } |
| |
| static u8 imode_to_type(u32 imode) |
| { |
| #define S_SHIFT 12 |
| static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { |
| [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, |
| [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, |
| [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, |
| [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, |
| [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, |
| [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, |
| [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, |
| }; |
| |
| return btrfs_type_by_mode[(imode & S_IFMT) >> S_SHIFT]; |
| #undef S_SHIFT |
| } |
| |
| static int device_record_compare(struct rb_node *node1, struct rb_node *node2) |
| { |
| struct device_record *rec1; |
| struct device_record *rec2; |
| |
| rec1 = rb_entry(node1, struct device_record, node); |
| rec2 = rb_entry(node2, struct device_record, node); |
| if (rec1->devid > rec2->devid) |
| return -1; |
| else if (rec1->devid < rec2->devid) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static struct inode_record *clone_inode_rec(struct inode_record *orig_rec) |
| { |
| struct inode_record *rec; |
| struct inode_backref *backref; |
| struct inode_backref *orig; |
| struct inode_backref *tmp; |
| struct orphan_data_extent *src_orphan; |
| struct orphan_data_extent *dst_orphan; |
| struct rb_node *rb; |
| size_t size; |
| int ret; |
| |
| rec = malloc(sizeof(*rec)); |
| if (!rec) |
| return ERR_PTR(-ENOMEM); |
| memcpy(rec, orig_rec, sizeof(*rec)); |
| rec->refs = 1; |
| INIT_LIST_HEAD(&rec->backrefs); |
| INIT_LIST_HEAD(&rec->orphan_extents); |
| rec->holes = RB_ROOT; |
| |
| list_for_each_entry(orig, &orig_rec->backrefs, list) { |
| size = sizeof(*orig) + orig->namelen + 1; |
| backref = malloc(size); |
| if (!backref) { |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| memcpy(backref, orig, size); |
| list_add_tail(&backref->list, &rec->backrefs); |
| } |
| list_for_each_entry(src_orphan, &orig_rec->orphan_extents, list) { |
| dst_orphan = malloc(sizeof(*dst_orphan)); |
| if (!dst_orphan) { |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| memcpy(dst_orphan, src_orphan, sizeof(*src_orphan)); |
| list_add_tail(&dst_orphan->list, &rec->orphan_extents); |
| } |
| ret = copy_file_extent_holes(&rec->holes, &orig_rec->holes); |
| if (ret < 0) |
| goto cleanup_rb; |
| |
| return rec; |
| |
| cleanup_rb: |
| rb = rb_first(&rec->holes); |
| while (rb) { |
| struct file_extent_hole *hole; |
| |
| hole = rb_entry(rb, struct file_extent_hole, node); |
| rb = rb_next(rb); |
| free(hole); |
| } |
| |
| cleanup: |
| if (!list_empty(&rec->backrefs)) |
| list_for_each_entry_safe(orig, tmp, &rec->backrefs, list) { |
| list_del(&orig->list); |
| free(orig); |
| } |
| |
| if (!list_empty(&rec->orphan_extents)) |
| list_for_each_entry_safe(orig, tmp, &rec->orphan_extents, list) { |
| list_del(&orig->list); |
| free(orig); |
| } |
| |
| free(rec); |
| |
| return ERR_PTR(ret); |
| } |
| |
| static void print_orphan_data_extents(struct list_head *orphan_extents, |
| u64 objectid) |
| { |
| struct orphan_data_extent *orphan; |
| |
| if (list_empty(orphan_extents)) |
| return; |
| printf("The following data extent is lost in tree %llu:\n", |
| objectid); |
| list_for_each_entry(orphan, orphan_extents, list) { |
| printf("\tinode: %llu, offset:%llu, disk_bytenr: %llu, disk_len: %llu\n", |
| orphan->objectid, orphan->offset, orphan->disk_bytenr, |
| orphan->disk_len); |
| } |
| } |
| |
| static void print_inode_error(struct btrfs_root *root, struct inode_record *rec) |
| { |
| u64 root_objectid = root->root_key.objectid; |
| int errors = rec->errors; |
| |
| if (!errors) |
| return; |
| /* reloc root errors, we print its corresponding fs root objectid*/ |
| if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| root_objectid = root->root_key.offset; |
| fprintf(stderr, "reloc"); |
| } |
| fprintf(stderr, "root %llu inode %llu errors %x", |
| (unsigned long long) root_objectid, |
| (unsigned long long) rec->ino, rec->errors); |
| |
| if (errors & I_ERR_NO_INODE_ITEM) |
| fprintf(stderr, ", no inode item"); |
| if (errors & I_ERR_NO_ORPHAN_ITEM) |
| fprintf(stderr, ", no orphan item"); |
| if (errors & I_ERR_DUP_INODE_ITEM) |
| fprintf(stderr, ", dup inode item"); |
| if (errors & I_ERR_DUP_DIR_INDEX) |
| fprintf(stderr, ", dup dir index"); |
| if (errors & I_ERR_ODD_DIR_ITEM) |
| fprintf(stderr, ", odd dir item"); |
| if (errors & I_ERR_ODD_FILE_EXTENT) |
| fprintf(stderr, ", odd file extent"); |
| if (errors & I_ERR_BAD_FILE_EXTENT) |
| fprintf(stderr, ", bad file extent"); |
| if (errors & I_ERR_FILE_EXTENT_OVERLAP) |
| fprintf(stderr, ", file extent overlap"); |
| if (errors & I_ERR_FILE_EXTENT_DISCOUNT) |
| fprintf(stderr, ", file extent discount"); |
| if (errors & I_ERR_DIR_ISIZE_WRONG) |
| fprintf(stderr, ", dir isize wrong"); |
| if (errors & I_ERR_FILE_NBYTES_WRONG) |
| fprintf(stderr, ", nbytes wrong"); |
| if (errors & I_ERR_ODD_CSUM_ITEM) |
| fprintf(stderr, ", odd csum item"); |
| if (errors & I_ERR_SOME_CSUM_MISSING) |
| fprintf(stderr, ", some csum missing"); |
| if (errors & I_ERR_LINK_COUNT_WRONG) |
| fprintf(stderr, ", link count wrong"); |
| if (errors & I_ERR_FILE_EXTENT_ORPHAN) |
| fprintf(stderr, ", orphan file extent"); |
| fprintf(stderr, "\n"); |
| /* Print the orphan extents if needed */ |
| if (errors & I_ERR_FILE_EXTENT_ORPHAN) |
| print_orphan_data_extents(&rec->orphan_extents, root->objectid); |
| |
| /* Print the holes if needed */ |
| if (errors & I_ERR_FILE_EXTENT_DISCOUNT) { |
| struct file_extent_hole *hole; |
| struct rb_node *node; |
| int found = 0; |
| |
| node = rb_first(&rec->holes); |
| fprintf(stderr, "Found file extent holes:\n"); |
| while (node) { |
| found = 1; |
| hole = rb_entry(node, struct file_extent_hole, node); |
| fprintf(stderr, "\tstart: %llu, len: %llu\n", |
| hole->start, hole->len); |
| node = rb_next(node); |
| } |
| if (!found) |
| fprintf(stderr, "\tstart: 0, len: %llu\n", |
| round_up(rec->isize, root->sectorsize)); |
| } |
| } |
| |
| static void print_ref_error(int errors) |
| { |
| if (errors & REF_ERR_NO_DIR_ITEM) |
| fprintf(stderr, ", no dir item"); |
| if (errors & REF_ERR_NO_DIR_INDEX) |
| fprintf(stderr, ", no dir index"); |
| if (errors & REF_ERR_NO_INODE_REF) |
| fprintf(stderr, ", no inode ref"); |
| if (errors & REF_ERR_DUP_DIR_ITEM) |
| fprintf(stderr, ", dup dir item"); |
| if (errors & REF_ERR_DUP_DIR_INDEX) |
| fprintf(stderr, ", dup dir index"); |
| if (errors & REF_ERR_DUP_INODE_REF) |
| fprintf(stderr, ", dup inode ref"); |
| if (errors & REF_ERR_INDEX_UNMATCH) |
| fprintf(stderr, ", index mismatch"); |
| if (errors & REF_ERR_FILETYPE_UNMATCH) |
| fprintf(stderr, ", filetype mismatch"); |
| if (errors & REF_ERR_NAME_TOO_LONG) |
| fprintf(stderr, ", name too long"); |
| if (errors & REF_ERR_NO_ROOT_REF) |
| fprintf(stderr, ", no root ref"); |
| if (errors & REF_ERR_NO_ROOT_BACKREF) |
| fprintf(stderr, ", no root backref"); |
| if (errors & REF_ERR_DUP_ROOT_REF) |
| fprintf(stderr, ", dup root ref"); |
| if (errors & REF_ERR_DUP_ROOT_BACKREF) |
| fprintf(stderr, ", dup root backref"); |
| fprintf(stderr, "\n"); |
| } |
| |
| static struct inode_record *get_inode_rec(struct cache_tree *inode_cache, |
| u64 ino, int mod) |
| { |
| struct ptr_node *node; |
| struct cache_extent *cache; |
| struct inode_record *rec = NULL; |
| int ret; |
| |
| cache = lookup_cache_extent(inode_cache, ino, 1); |
| if (cache) { |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| if (mod && rec->refs > 1) { |
| node->data = clone_inode_rec(rec); |
| if (IS_ERR(node->data)) |
| return node->data; |
| rec->refs--; |
| rec = node->data; |
| } |
| } else if (mod) { |
| rec = calloc(1, sizeof(*rec)); |
| if (!rec) |
| return ERR_PTR(-ENOMEM); |
| rec->ino = ino; |
| rec->extent_start = (u64)-1; |
| rec->refs = 1; |
| INIT_LIST_HEAD(&rec->backrefs); |
| INIT_LIST_HEAD(&rec->orphan_extents); |
| rec->holes = RB_ROOT; |
| |
| node = malloc(sizeof(*node)); |
| if (!node) { |
| free(rec); |
| return ERR_PTR(-ENOMEM); |
| } |
| node->cache.start = ino; |
| node->cache.size = 1; |
| node->data = rec; |
| |
| if (ino == BTRFS_FREE_INO_OBJECTID) |
| rec->found_link = 1; |
| |
| ret = insert_cache_extent(inode_cache, &node->cache); |
| if (ret) |
| return ERR_PTR(-EEXIST); |
| } |
| return rec; |
| } |
| |
| static void free_orphan_data_extents(struct list_head *orphan_extents) |
| { |
| struct orphan_data_extent *orphan; |
| |
| while (!list_empty(orphan_extents)) { |
| orphan = list_entry(orphan_extents->next, |
| struct orphan_data_extent, list); |
| list_del(&orphan->list); |
| free(orphan); |
| } |
| } |
| |
| static void free_inode_rec(struct inode_record *rec) |
| { |
| struct inode_backref *backref; |
| |
| if (--rec->refs > 0) |
| return; |
| |
| while (!list_empty(&rec->backrefs)) { |
| backref = to_inode_backref(rec->backrefs.next); |
| list_del(&backref->list); |
| free(backref); |
| } |
| free_orphan_data_extents(&rec->orphan_extents); |
| free_file_extent_holes(&rec->holes); |
| free(rec); |
| } |
| |
| static int can_free_inode_rec(struct inode_record *rec) |
| { |
| if (!rec->errors && rec->checked && rec->found_inode_item && |
| rec->nlink == rec->found_link && list_empty(&rec->backrefs)) |
| return 1; |
| return 0; |
| } |
| |
| static void maybe_free_inode_rec(struct cache_tree *inode_cache, |
| struct inode_record *rec) |
| { |
| struct cache_extent *cache; |
| struct inode_backref *tmp, *backref; |
| struct ptr_node *node; |
| u8 filetype; |
| |
| if (!rec->found_inode_item) |
| return; |
| |
| filetype = imode_to_type(rec->imode); |
| list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { |
| if (backref->found_dir_item && backref->found_dir_index) { |
| if (backref->filetype != filetype) |
| backref->errors |= REF_ERR_FILETYPE_UNMATCH; |
| if (!backref->errors && backref->found_inode_ref && |
| rec->nlink == rec->found_link) { |
| list_del(&backref->list); |
| free(backref); |
| } |
| } |
| } |
| |
| if (!rec->checked || rec->merging) |
| return; |
| |
| if (S_ISDIR(rec->imode)) { |
| if (rec->found_size != rec->isize) |
| rec->errors |= I_ERR_DIR_ISIZE_WRONG; |
| if (rec->found_file_extent) |
| rec->errors |= I_ERR_ODD_FILE_EXTENT; |
| } else if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) { |
| if (rec->found_dir_item) |
| rec->errors |= I_ERR_ODD_DIR_ITEM; |
| if (rec->found_size != rec->nbytes) |
| rec->errors |= I_ERR_FILE_NBYTES_WRONG; |
| if (rec->nlink > 0 && !no_holes && |
| (rec->extent_end < rec->isize || |
| first_extent_gap(&rec->holes) < rec->isize)) |
| rec->errors |= I_ERR_FILE_EXTENT_DISCOUNT; |
| } |
| |
| if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) { |
| if (rec->found_csum_item && rec->nodatasum) |
| rec->errors |= I_ERR_ODD_CSUM_ITEM; |
| if (rec->some_csum_missing && !rec->nodatasum) |
| rec->errors |= I_ERR_SOME_CSUM_MISSING; |
| } |
| |
| BUG_ON(rec->refs != 1); |
| if (can_free_inode_rec(rec)) { |
| cache = lookup_cache_extent(inode_cache, rec->ino, 1); |
| node = container_of(cache, struct ptr_node, cache); |
| BUG_ON(node->data != rec); |
| remove_cache_extent(inode_cache, &node->cache); |
| free(node); |
| free_inode_rec(rec); |
| } |
| } |
| |
| static int check_orphan_item(struct btrfs_root *root, u64 ino) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| int ret; |
| |
| key.objectid = BTRFS_ORPHAN_OBJECTID; |
| key.type = BTRFS_ORPHAN_ITEM_KEY; |
| key.offset = ino; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| btrfs_release_path(&path); |
| if (ret > 0) |
| ret = -ENOENT; |
| return ret; |
| } |
| |
| static int process_inode_item(struct extent_buffer *eb, |
| int slot, struct btrfs_key *key, |
| struct shared_node *active_node) |
| { |
| struct inode_record *rec; |
| struct btrfs_inode_item *item; |
| |
| rec = active_node->current; |
| BUG_ON(rec->ino != key->objectid || rec->refs > 1); |
| if (rec->found_inode_item) { |
| rec->errors |= I_ERR_DUP_INODE_ITEM; |
| return 1; |
| } |
| item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); |
| rec->nlink = btrfs_inode_nlink(eb, item); |
| rec->isize = btrfs_inode_size(eb, item); |
| rec->nbytes = btrfs_inode_nbytes(eb, item); |
| rec->imode = btrfs_inode_mode(eb, item); |
| if (btrfs_inode_flags(eb, item) & BTRFS_INODE_NODATASUM) |
| rec->nodatasum = 1; |
| rec->found_inode_item = 1; |
| if (rec->nlink == 0) |
| rec->errors |= I_ERR_NO_ORPHAN_ITEM; |
| maybe_free_inode_rec(&active_node->inode_cache, rec); |
| return 0; |
| } |
| |
| static struct inode_backref *get_inode_backref(struct inode_record *rec, |
| const char *name, |
| int namelen, u64 dir) |
| { |
| struct inode_backref *backref; |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (rec->ino == BTRFS_MULTIPLE_OBJECTIDS) |
| break; |
| if (backref->dir != dir || backref->namelen != namelen) |
| continue; |
| if (memcmp(name, backref->name, namelen)) |
| continue; |
| return backref; |
| } |
| |
| backref = malloc(sizeof(*backref) + namelen + 1); |
| if (!backref) |
| return NULL; |
| memset(backref, 0, sizeof(*backref)); |
| backref->dir = dir; |
| backref->namelen = namelen; |
| memcpy(backref->name, name, namelen); |
| backref->name[namelen] = '\0'; |
| list_add_tail(&backref->list, &rec->backrefs); |
| return backref; |
| } |
| |
| static int add_inode_backref(struct cache_tree *inode_cache, |
| u64 ino, u64 dir, u64 index, |
| const char *name, int namelen, |
| u8 filetype, u8 itemtype, int errors) |
| { |
| struct inode_record *rec; |
| struct inode_backref *backref; |
| |
| rec = get_inode_rec(inode_cache, ino, 1); |
| BUG_ON(IS_ERR(rec)); |
| backref = get_inode_backref(rec, name, namelen, dir); |
| BUG_ON(!backref); |
| if (errors) |
| backref->errors |= errors; |
| if (itemtype == BTRFS_DIR_INDEX_KEY) { |
| if (backref->found_dir_index) |
| backref->errors |= REF_ERR_DUP_DIR_INDEX; |
| if (backref->found_inode_ref && backref->index != index) |
| backref->errors |= REF_ERR_INDEX_UNMATCH; |
| if (backref->found_dir_item && backref->filetype != filetype) |
| backref->errors |= REF_ERR_FILETYPE_UNMATCH; |
| |
| backref->index = index; |
| backref->filetype = filetype; |
| backref->found_dir_index = 1; |
| } else if (itemtype == BTRFS_DIR_ITEM_KEY) { |
| rec->found_link++; |
| if (backref->found_dir_item) |
| backref->errors |= REF_ERR_DUP_DIR_ITEM; |
| if (backref->found_dir_index && backref->filetype != filetype) |
| backref->errors |= REF_ERR_FILETYPE_UNMATCH; |
| |
| backref->filetype = filetype; |
| backref->found_dir_item = 1; |
| } else if ((itemtype == BTRFS_INODE_REF_KEY) || |
| (itemtype == BTRFS_INODE_EXTREF_KEY)) { |
| if (backref->found_inode_ref) |
| backref->errors |= REF_ERR_DUP_INODE_REF; |
| if (backref->found_dir_index && backref->index != index) |
| backref->errors |= REF_ERR_INDEX_UNMATCH; |
| else |
| backref->index = index; |
| |
| backref->ref_type = itemtype; |
| backref->found_inode_ref = 1; |
| } else { |
| BUG_ON(1); |
| } |
| |
| maybe_free_inode_rec(inode_cache, rec); |
| return 0; |
| } |
| |
| static int merge_inode_recs(struct inode_record *src, struct inode_record *dst, |
| struct cache_tree *dst_cache) |
| { |
| struct inode_backref *backref; |
| u32 dir_count = 0; |
| int ret = 0; |
| |
| dst->merging = 1; |
| list_for_each_entry(backref, &src->backrefs, list) { |
| if (backref->found_dir_index) { |
| add_inode_backref(dst_cache, dst->ino, backref->dir, |
| backref->index, backref->name, |
| backref->namelen, backref->filetype, |
| BTRFS_DIR_INDEX_KEY, backref->errors); |
| } |
| if (backref->found_dir_item) { |
| dir_count++; |
| add_inode_backref(dst_cache, dst->ino, |
| backref->dir, 0, backref->name, |
| backref->namelen, backref->filetype, |
| BTRFS_DIR_ITEM_KEY, backref->errors); |
| } |
| if (backref->found_inode_ref) { |
| add_inode_backref(dst_cache, dst->ino, |
| backref->dir, backref->index, |
| backref->name, backref->namelen, 0, |
| backref->ref_type, backref->errors); |
| } |
| } |
| |
| if (src->found_dir_item) |
| dst->found_dir_item = 1; |
| if (src->found_file_extent) |
| dst->found_file_extent = 1; |
| if (src->found_csum_item) |
| dst->found_csum_item = 1; |
| if (src->some_csum_missing) |
| dst->some_csum_missing = 1; |
| if (first_extent_gap(&dst->holes) > first_extent_gap(&src->holes)) { |
| ret = copy_file_extent_holes(&dst->holes, &src->holes); |
| if (ret < 0) |
| return ret; |
| } |
| |
| BUG_ON(src->found_link < dir_count); |
| dst->found_link += src->found_link - dir_count; |
| dst->found_size += src->found_size; |
| if (src->extent_start != (u64)-1) { |
| if (dst->extent_start == (u64)-1) { |
| dst->extent_start = src->extent_start; |
| dst->extent_end = src->extent_end; |
| } else { |
| if (dst->extent_end > src->extent_start) |
| dst->errors |= I_ERR_FILE_EXTENT_OVERLAP; |
| else if (dst->extent_end < src->extent_start) { |
| ret = add_file_extent_hole(&dst->holes, |
| dst->extent_end, |
| src->extent_start - dst->extent_end); |
| } |
| if (dst->extent_end < src->extent_end) |
| dst->extent_end = src->extent_end; |
| } |
| } |
| |
| dst->errors |= src->errors; |
| if (src->found_inode_item) { |
| if (!dst->found_inode_item) { |
| dst->nlink = src->nlink; |
| dst->isize = src->isize; |
| dst->nbytes = src->nbytes; |
| dst->imode = src->imode; |
| dst->nodatasum = src->nodatasum; |
| dst->found_inode_item = 1; |
| } else { |
| dst->errors |= I_ERR_DUP_INODE_ITEM; |
| } |
| } |
| dst->merging = 0; |
| |
| return 0; |
| } |
| |
| static int splice_shared_node(struct shared_node *src_node, |
| struct shared_node *dst_node) |
| { |
| struct cache_extent *cache; |
| struct ptr_node *node, *ins; |
| struct cache_tree *src, *dst; |
| struct inode_record *rec, *conflict; |
| u64 current_ino = 0; |
| int splice = 0; |
| int ret; |
| |
| if (--src_node->refs == 0) |
| splice = 1; |
| if (src_node->current) |
| current_ino = src_node->current->ino; |
| |
| src = &src_node->root_cache; |
| dst = &dst_node->root_cache; |
| again: |
| cache = search_cache_extent(src, 0); |
| while (cache) { |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| cache = next_cache_extent(cache); |
| |
| if (splice) { |
| remove_cache_extent(src, &node->cache); |
| ins = node; |
| } else { |
| ins = malloc(sizeof(*ins)); |
| BUG_ON(!ins); |
| ins->cache.start = node->cache.start; |
| ins->cache.size = node->cache.size; |
| ins->data = rec; |
| rec->refs++; |
| } |
| ret = insert_cache_extent(dst, &ins->cache); |
| if (ret == -EEXIST) { |
| conflict = get_inode_rec(dst, rec->ino, 1); |
| BUG_ON(IS_ERR(conflict)); |
| merge_inode_recs(rec, conflict, dst); |
| if (rec->checked) { |
| conflict->checked = 1; |
| if (dst_node->current == conflict) |
| dst_node->current = NULL; |
| } |
| maybe_free_inode_rec(dst, conflict); |
| free_inode_rec(rec); |
| free(ins); |
| } else { |
| BUG_ON(ret); |
| } |
| } |
| |
| if (src == &src_node->root_cache) { |
| src = &src_node->inode_cache; |
| dst = &dst_node->inode_cache; |
| goto again; |
| } |
| |
| if (current_ino > 0 && (!dst_node->current || |
| current_ino > dst_node->current->ino)) { |
| if (dst_node->current) { |
| dst_node->current->checked = 1; |
| maybe_free_inode_rec(dst, dst_node->current); |
| } |
| dst_node->current = get_inode_rec(dst, current_ino, 1); |
| BUG_ON(IS_ERR(dst_node->current)); |
| } |
| return 0; |
| } |
| |
| static void free_inode_ptr(struct cache_extent *cache) |
| { |
| struct ptr_node *node; |
| struct inode_record *rec; |
| |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| free_inode_rec(rec); |
| free(node); |
| } |
| |
| FREE_EXTENT_CACHE_BASED_TREE(inode_recs, free_inode_ptr); |
| |
| static struct shared_node *find_shared_node(struct cache_tree *shared, |
| u64 bytenr) |
| { |
| struct cache_extent *cache; |
| struct shared_node *node; |
| |
| cache = lookup_cache_extent(shared, bytenr, 1); |
| if (cache) { |
| node = container_of(cache, struct shared_node, cache); |
| return node; |
| } |
| return NULL; |
| } |
| |
| static int add_shared_node(struct cache_tree *shared, u64 bytenr, u32 refs) |
| { |
| int ret; |
| struct shared_node *node; |
| |
| node = calloc(1, sizeof(*node)); |
| if (!node) |
| return -ENOMEM; |
| node->cache.start = bytenr; |
| node->cache.size = 1; |
| cache_tree_init(&node->root_cache); |
| cache_tree_init(&node->inode_cache); |
| node->refs = refs; |
| |
| ret = insert_cache_extent(shared, &node->cache); |
| |
| return ret; |
| } |
| |
| static int enter_shared_node(struct btrfs_root *root, u64 bytenr, u32 refs, |
| struct walk_control *wc, int level) |
| { |
| struct shared_node *node; |
| struct shared_node *dest; |
| int ret; |
| |
| if (level == wc->active_node) |
| return 0; |
| |
| BUG_ON(wc->active_node <= level); |
| node = find_shared_node(&wc->shared, bytenr); |
| if (!node) { |
| ret = add_shared_node(&wc->shared, bytenr, refs); |
| BUG_ON(ret); |
| node = find_shared_node(&wc->shared, bytenr); |
| wc->nodes[level] = node; |
| wc->active_node = level; |
| return 0; |
| } |
| |
| if (wc->root_level == wc->active_node && |
| btrfs_root_refs(&root->root_item) == 0) { |
| if (--node->refs == 0) { |
| free_inode_recs_tree(&node->root_cache); |
| free_inode_recs_tree(&node->inode_cache); |
| remove_cache_extent(&wc->shared, &node->cache); |
| free(node); |
| } |
| return 1; |
| } |
| |
| dest = wc->nodes[wc->active_node]; |
| splice_shared_node(node, dest); |
| if (node->refs == 0) { |
| remove_cache_extent(&wc->shared, &node->cache); |
| free(node); |
| } |
| return 1; |
| } |
| |
| static int leave_shared_node(struct btrfs_root *root, |
| struct walk_control *wc, int level) |
| { |
| struct shared_node *node; |
| struct shared_node *dest; |
| int i; |
| |
| if (level == wc->root_level) |
| return 0; |
| |
| for (i = level + 1; i < BTRFS_MAX_LEVEL; i++) { |
| if (wc->nodes[i]) |
| break; |
| } |
| BUG_ON(i >= BTRFS_MAX_LEVEL); |
| |
| node = wc->nodes[wc->active_node]; |
| wc->nodes[wc->active_node] = NULL; |
| wc->active_node = i; |
| |
| dest = wc->nodes[wc->active_node]; |
| if (wc->active_node < wc->root_level || |
| btrfs_root_refs(&root->root_item) > 0) { |
| BUG_ON(node->refs <= 1); |
| splice_shared_node(node, dest); |
| } else { |
| BUG_ON(node->refs < 2); |
| node->refs--; |
| } |
| return 0; |
| } |
| |
| /* |
| * Returns: |
| * < 0 - on error |
| * 1 - if the root with id child_root_id is a child of root parent_root_id |
| * 0 - if the root child_root_id isn't a child of the root parent_root_id but |
| * has other root(s) as parent(s) |
| * 2 - if the root child_root_id doesn't have any parent roots |
| */ |
| static int is_child_root(struct btrfs_root *root, u64 parent_root_id, |
| u64 child_root_id) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct extent_buffer *leaf; |
| int has_parent = 0; |
| int ret; |
| |
| btrfs_init_path(&path); |
| |
| key.objectid = parent_root_id; |
| key.type = BTRFS_ROOT_REF_KEY; |
| key.offset = child_root_id; |
| ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, |
| 0, 0); |
| if (ret < 0) |
| return ret; |
| btrfs_release_path(&path); |
| if (!ret) |
| return 1; |
| |
| key.objectid = child_root_id; |
| key.type = BTRFS_ROOT_BACKREF_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, |
| 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| while (1) { |
| leaf = path.nodes[0]; |
| if (path.slots[0] >= btrfs_header_nritems(leaf)) { |
| ret = btrfs_next_leaf(root->fs_info->tree_root, &path); |
| if (ret) |
| break; |
| leaf = path.nodes[0]; |
| } |
| |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.objectid != child_root_id || |
| key.type != BTRFS_ROOT_BACKREF_KEY) |
| break; |
| |
| has_parent = 1; |
| |
| if (key.offset == parent_root_id) { |
| btrfs_release_path(&path); |
| return 1; |
| } |
| |
| path.slots[0]++; |
| } |
| out: |
| btrfs_release_path(&path); |
| if (ret < 0) |
| return ret; |
| return has_parent ? 0 : 2; |
| } |
| |
| static int process_dir_item(struct extent_buffer *eb, |
| int slot, struct btrfs_key *key, |
| struct shared_node *active_node) |
| { |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u32 data_len; |
| int error; |
| int nritems = 0; |
| u8 filetype; |
| struct btrfs_dir_item *di; |
| struct inode_record *rec; |
| struct cache_tree *root_cache; |
| struct cache_tree *inode_cache; |
| struct btrfs_key location; |
| char namebuf[BTRFS_NAME_LEN]; |
| |
| root_cache = &active_node->root_cache; |
| inode_cache = &active_node->inode_cache; |
| rec = active_node->current; |
| rec->found_dir_item = 1; |
| |
| di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); |
| total = btrfs_item_size_nr(eb, slot); |
| while (cur < total) { |
| nritems++; |
| btrfs_dir_item_key_to_cpu(eb, di, &location); |
| name_len = btrfs_dir_name_len(eb, di); |
| data_len = btrfs_dir_data_len(eb, di); |
| filetype = btrfs_dir_type(eb, di); |
| |
| rec->found_size += name_len; |
| if (cur + sizeof(*di) + name_len > total || |
| name_len > BTRFS_NAME_LEN) { |
| error = REF_ERR_NAME_TOO_LONG; |
| |
| if (cur + sizeof(*di) > total) |
| break; |
| len = min_t(u32, total - cur - sizeof(*di), |
| BTRFS_NAME_LEN); |
| } else { |
| len = name_len; |
| error = 0; |
| } |
| |
| read_extent_buffer(eb, namebuf, (unsigned long)(di + 1), len); |
| |
| if (location.type == BTRFS_INODE_ITEM_KEY) { |
| add_inode_backref(inode_cache, location.objectid, |
| key->objectid, key->offset, namebuf, |
| len, filetype, key->type, error); |
| } else if (location.type == BTRFS_ROOT_ITEM_KEY) { |
| add_inode_backref(root_cache, location.objectid, |
| key->objectid, key->offset, |
| namebuf, len, filetype, |
| key->type, error); |
| } else { |
| fprintf(stderr, "invalid location in dir item %u\n", |
| location.type); |
| add_inode_backref(inode_cache, BTRFS_MULTIPLE_OBJECTIDS, |
| key->objectid, key->offset, namebuf, |
| len, filetype, key->type, error); |
| } |
| |
| len = sizeof(*di) + name_len + data_len; |
| di = (struct btrfs_dir_item *)((char *)di + len); |
| cur += len; |
| } |
| if (key->type == BTRFS_DIR_INDEX_KEY && nritems > 1) |
| rec->errors |= I_ERR_DUP_DIR_INDEX; |
| |
| return 0; |
| } |
| |
| static int process_inode_ref(struct extent_buffer *eb, |
| int slot, struct btrfs_key *key, |
| struct shared_node *active_node) |
| { |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u64 index; |
| int error; |
| struct cache_tree *inode_cache; |
| struct btrfs_inode_ref *ref; |
| char namebuf[BTRFS_NAME_LEN]; |
| |
| inode_cache = &active_node->inode_cache; |
| |
| ref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref); |
| total = btrfs_item_size_nr(eb, slot); |
| while (cur < total) { |
| name_len = btrfs_inode_ref_name_len(eb, ref); |
| index = btrfs_inode_ref_index(eb, ref); |
| |
| /* inode_ref + namelen should not cross item boundary */ |
| if (cur + sizeof(*ref) + name_len > total || |
| name_len > BTRFS_NAME_LEN) { |
| if (total < cur + sizeof(*ref)) |
| break; |
| |
| /* Still try to read out the remaining part */ |
| len = min_t(u32, total - cur - sizeof(*ref), |
| BTRFS_NAME_LEN); |
| error = REF_ERR_NAME_TOO_LONG; |
| } else { |
| len = name_len; |
| error = 0; |
| } |
| |
| read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len); |
| add_inode_backref(inode_cache, key->objectid, key->offset, |
| index, namebuf, len, 0, key->type, error); |
| |
| len = sizeof(*ref) + name_len; |
| ref = (struct btrfs_inode_ref *)((char *)ref + len); |
| cur += len; |
| } |
| return 0; |
| } |
| |
| static int process_inode_extref(struct extent_buffer *eb, |
| int slot, struct btrfs_key *key, |
| struct shared_node *active_node) |
| { |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u64 index; |
| u64 parent; |
| int error; |
| struct cache_tree *inode_cache; |
| struct btrfs_inode_extref *extref; |
| char namebuf[BTRFS_NAME_LEN]; |
| |
| inode_cache = &active_node->inode_cache; |
| |
| extref = btrfs_item_ptr(eb, slot, struct btrfs_inode_extref); |
| total = btrfs_item_size_nr(eb, slot); |
| while (cur < total) { |
| name_len = btrfs_inode_extref_name_len(eb, extref); |
| index = btrfs_inode_extref_index(eb, extref); |
| parent = btrfs_inode_extref_parent(eb, extref); |
| if (name_len <= BTRFS_NAME_LEN) { |
| len = name_len; |
| error = 0; |
| } else { |
| len = BTRFS_NAME_LEN; |
| error = REF_ERR_NAME_TOO_LONG; |
| } |
| read_extent_buffer(eb, namebuf, |
| (unsigned long)(extref + 1), len); |
| add_inode_backref(inode_cache, key->objectid, parent, |
| index, namebuf, len, 0, key->type, error); |
| |
| len = sizeof(*extref) + name_len; |
| extref = (struct btrfs_inode_extref *)((char *)extref + len); |
| cur += len; |
| } |
| return 0; |
| |
| } |
| |
| static int count_csum_range(struct btrfs_root *root, u64 start, |
| u64 len, u64 *found) |
| { |
| struct btrfs_key key; |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| int ret; |
| size_t size; |
| *found = 0; |
| u64 csum_end; |
| u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
| |
| btrfs_init_path(&path); |
| |
| key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| key.offset = start; |
| key.type = BTRFS_EXTENT_CSUM_KEY; |
| |
| ret = btrfs_search_slot(NULL, root->fs_info->csum_root, |
| &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| if (ret > 0 && path.slots[0] > 0) { |
| leaf = path.nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0] - 1); |
| if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID && |
| key.type == BTRFS_EXTENT_CSUM_KEY) |
| path.slots[0]--; |
| } |
| |
| while (len > 0) { |
| leaf = path.nodes[0]; |
| if (path.slots[0] >= btrfs_header_nritems(leaf)) { |
| ret = btrfs_next_leaf(root->fs_info->csum_root, &path); |
| if (ret > 0) |
| break; |
| else if (ret < 0) |
| goto out; |
| leaf = path.nodes[0]; |
| } |
| |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
| key.type != BTRFS_EXTENT_CSUM_KEY) |
| break; |
| |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.offset >= start + len) |
| break; |
| |
| if (key.offset > start) |
| start = key.offset; |
| |
| size = btrfs_item_size_nr(leaf, path.slots[0]); |
| csum_end = key.offset + (size / csum_size) * root->sectorsize; |
| if (csum_end > start) { |
| size = min(csum_end - start, len); |
| len -= size; |
| start += size; |
| *found += size; |
| } |
| |
| path.slots[0]++; |
| } |
| out: |
| btrfs_release_path(&path); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| static int process_file_extent(struct btrfs_root *root, |
| struct extent_buffer *eb, |
| int slot, struct btrfs_key *key, |
| struct shared_node *active_node) |
| { |
| struct inode_record *rec; |
| struct btrfs_file_extent_item *fi; |
| u64 num_bytes = 0; |
| u64 disk_bytenr = 0; |
| u64 extent_offset = 0; |
| u64 mask = root->sectorsize - 1; |
| int extent_type; |
| int ret; |
| |
| rec = active_node->current; |
| BUG_ON(rec->ino != key->objectid || rec->refs > 1); |
| rec->found_file_extent = 1; |
| |
| if (rec->extent_start == (u64)-1) { |
| rec->extent_start = key->offset; |
| rec->extent_end = key->offset; |
| } |
| |
| if (rec->extent_end > key->offset) |
| rec->errors |= I_ERR_FILE_EXTENT_OVERLAP; |
| else if (rec->extent_end < key->offset) { |
| ret = add_file_extent_hole(&rec->holes, rec->extent_end, |
| key->offset - rec->extent_end); |
| if (ret < 0) |
| return ret; |
| } |
| |
| fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); |
| extent_type = btrfs_file_extent_type(eb, fi); |
| |
| if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| num_bytes = btrfs_file_extent_inline_len(eb, slot, fi); |
| if (num_bytes == 0) |
| rec->errors |= I_ERR_BAD_FILE_EXTENT; |
| rec->found_size += num_bytes; |
| num_bytes = (num_bytes + mask) & ~mask; |
| } else if (extent_type == BTRFS_FILE_EXTENT_REG || |
| extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| num_bytes = btrfs_file_extent_num_bytes(eb, fi); |
| disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi); |
| extent_offset = btrfs_file_extent_offset(eb, fi); |
| if (num_bytes == 0 || (num_bytes & mask)) |
| rec->errors |= I_ERR_BAD_FILE_EXTENT; |
| if (num_bytes + extent_offset > |
| btrfs_file_extent_ram_bytes(eb, fi)) |
| rec->errors |= I_ERR_BAD_FILE_EXTENT; |
| if (extent_type == BTRFS_FILE_EXTENT_PREALLOC && |
| (btrfs_file_extent_compression(eb, fi) || |
| btrfs_file_extent_encryption(eb, fi) || |
| btrfs_file_extent_other_encoding(eb, fi))) |
| rec->errors |= I_ERR_BAD_FILE_EXTENT; |
| if (disk_bytenr > 0) |
| rec->found_size += num_bytes; |
| } else { |
| rec->errors |= I_ERR_BAD_FILE_EXTENT; |
| } |
| rec->extent_end = key->offset + num_bytes; |
| |
| /* |
| * The data reloc tree will copy full extents into its inode and then |
| * copy the corresponding csums. Because the extent it copied could be |
| * a preallocated extent that hasn't been written to yet there may be no |
| * csums to copy, ergo we won't have csums for our file extent. This is |
| * ok so just don't bother checking csums if the inode belongs to the |
| * data reloc tree. |
| */ |
| if (disk_bytenr > 0 && |
| btrfs_header_owner(eb) != BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| u64 found; |
| if (btrfs_file_extent_compression(eb, fi)) |
| num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); |
| else |
| disk_bytenr += extent_offset; |
| |
| ret = count_csum_range(root, disk_bytenr, num_bytes, &found); |
| if (ret < 0) |
| return ret; |
| if (extent_type == BTRFS_FILE_EXTENT_REG) { |
| if (found > 0) |
| rec->found_csum_item = 1; |
| if (found < num_bytes) |
| rec->some_csum_missing = 1; |
| } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| if (found > 0) |
| rec->errors |= I_ERR_ODD_CSUM_ITEM; |
| } |
| } |
| return 0; |
| } |
| |
| static int process_one_leaf(struct btrfs_root *root, struct extent_buffer *eb, |
| struct walk_control *wc) |
| { |
| struct btrfs_key key; |
| u32 nritems; |
| int i; |
| int ret = 0; |
| struct cache_tree *inode_cache; |
| struct shared_node *active_node; |
| |
| if (wc->root_level == wc->active_node && |
| btrfs_root_refs(&root->root_item) == 0) |
| return 0; |
| |
| active_node = wc->nodes[wc->active_node]; |
| inode_cache = &active_node->inode_cache; |
| nritems = btrfs_header_nritems(eb); |
| for (i = 0; i < nritems; i++) { |
| btrfs_item_key_to_cpu(eb, &key, i); |
| |
| if (key.objectid == BTRFS_FREE_SPACE_OBJECTID) |
| continue; |
| if (key.type == BTRFS_ORPHAN_ITEM_KEY) |
| continue; |
| |
| if (active_node->current == NULL || |
| active_node->current->ino < key.objectid) { |
| if (active_node->current) { |
| active_node->current->checked = 1; |
| maybe_free_inode_rec(inode_cache, |
| active_node->current); |
| } |
| active_node->current = get_inode_rec(inode_cache, |
| key.objectid, 1); |
| BUG_ON(IS_ERR(active_node->current)); |
| } |
| switch (key.type) { |
| case BTRFS_DIR_ITEM_KEY: |
| case BTRFS_DIR_INDEX_KEY: |
| ret = process_dir_item(eb, i, &key, active_node); |
| break; |
| case BTRFS_INODE_REF_KEY: |
| ret = process_inode_ref(eb, i, &key, active_node); |
| break; |
| case BTRFS_INODE_EXTREF_KEY: |
| ret = process_inode_extref(eb, i, &key, active_node); |
| break; |
| case BTRFS_INODE_ITEM_KEY: |
| ret = process_inode_item(eb, i, &key, active_node); |
| break; |
| case BTRFS_EXTENT_DATA_KEY: |
| ret = process_file_extent(root, eb, i, &key, |
| active_node); |
| break; |
| default: |
| break; |
| }; |
| } |
| return ret; |
| } |
| |
| struct node_refs { |
| u64 bytenr[BTRFS_MAX_LEVEL]; |
| u64 refs[BTRFS_MAX_LEVEL]; |
| int need_check[BTRFS_MAX_LEVEL]; |
| }; |
| |
| static int update_nodes_refs(struct btrfs_root *root, u64 bytenr, |
| struct node_refs *nrefs, u64 level); |
| static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path, |
| unsigned int ext_ref); |
| |
| /* |
| * Returns >0 Found error, not fatal, should continue |
| * Returns <0 Fatal error, must exit the whole check |
| * Returns 0 No errors found |
| */ |
| static int process_one_leaf_v2(struct btrfs_root *root, struct btrfs_path *path, |
| struct node_refs *nrefs, int *level, int ext_ref) |
| { |
| struct extent_buffer *cur = path->nodes[0]; |
| struct btrfs_key key; |
| u64 cur_bytenr; |
| u32 nritems; |
| u64 first_ino = 0; |
| int root_level = btrfs_header_level(root->node); |
| int i; |
| int ret = 0; /* Final return value */ |
| int err = 0; /* Positive error bitmap */ |
| |
| cur_bytenr = cur->start; |
| |
| /* skip to first inode item or the first inode number change */ |
| nritems = btrfs_header_nritems(cur); |
| for (i = 0; i < nritems; i++) { |
| btrfs_item_key_to_cpu(cur, &key, i); |
| if (i == 0) |
| first_ino = key.objectid; |
| if (key.type == BTRFS_INODE_ITEM_KEY || |
| (first_ino && first_ino != key.objectid)) |
| break; |
| } |
| if (i == nritems) { |
| path->slots[0] = nritems; |
| return 0; |
| } |
| path->slots[0] = i; |
| |
| again: |
| err |= check_inode_item(root, path, ext_ref); |
| |
| if (err & LAST_ITEM) |
| goto out; |
| |
| /* still have inode items in thie leaf */ |
| if (cur->start == cur_bytenr) |
| goto again; |
| |
| /* |
| * we have switched to another leaf, above nodes may |
| * have changed, here walk down the path, if a node |
| * or leaf is shared, check whether we can skip this |
| * node or leaf. |
| */ |
| for (i = root_level; i >= 0; i--) { |
| if (path->nodes[i]->start == nrefs->bytenr[i]) |
| continue; |
| |
| ret = update_nodes_refs(root, |
| path->nodes[i]->start, |
| nrefs, i); |
| if (ret) |
| goto out; |
| |
| if (!nrefs->need_check[i]) { |
| *level += 1; |
| break; |
| } |
| } |
| |
| for (i = 0; i < *level; i++) { |
| free_extent_buffer(path->nodes[i]); |
| path->nodes[i] = NULL; |
| } |
| out: |
| err &= ~LAST_ITEM; |
| if (err && !ret) |
| ret = err; |
| return ret; |
| } |
| |
| static void reada_walk_down(struct btrfs_root *root, |
| struct extent_buffer *node, int slot) |
| { |
| u64 bytenr; |
| u64 ptr_gen; |
| u32 nritems; |
| u32 blocksize; |
| int i; |
| int level; |
| |
| level = btrfs_header_level(node); |
| if (level != 1) |
| return; |
| |
| nritems = btrfs_header_nritems(node); |
| blocksize = root->nodesize; |
| for (i = slot; i < nritems; i++) { |
| bytenr = btrfs_node_blockptr(node, i); |
| ptr_gen = btrfs_node_ptr_generation(node, i); |
| readahead_tree_block(root, bytenr, blocksize, ptr_gen); |
| } |
| } |
| |
| /* |
| * Check the child node/leaf by the following condition: |
| * 1. the first item key of the node/leaf should be the same with the one |
| * in parent. |
| * 2. block in parent node should match the child node/leaf. |
| * 3. generation of parent node and child's header should be consistent. |
| * |
| * Or the child node/leaf pointed by the key in parent is not valid. |
| * |
| * We hope to check leaf owner too, but since subvol may share leaves, |
| * which makes leaf owner check not so strong, key check should be |
| * sufficient enough for that case. |
| */ |
| static int check_child_node(struct extent_buffer *parent, int slot, |
| struct extent_buffer *child) |
| { |
| struct btrfs_key parent_key; |
| struct btrfs_key child_key; |
| int ret = 0; |
| |
| btrfs_node_key_to_cpu(parent, &parent_key, slot); |
| if (btrfs_header_level(child) == 0) |
| btrfs_item_key_to_cpu(child, &child_key, 0); |
| else |
| btrfs_node_key_to_cpu(child, &child_key, 0); |
| |
| if (memcmp(&parent_key, &child_key, sizeof(parent_key))) { |
| ret = -EINVAL; |
| fprintf(stderr, |
| "Wrong key of child node/leaf, wanted: (%llu, %u, %llu), have: (%llu, %u, %llu)\n", |
| parent_key.objectid, parent_key.type, parent_key.offset, |
| child_key.objectid, child_key.type, child_key.offset); |
| } |
| if (btrfs_header_bytenr(child) != btrfs_node_blockptr(parent, slot)) { |
| ret = -EINVAL; |
| fprintf(stderr, "Wrong block of child node/leaf, wanted: %llu, have: %llu\n", |
| btrfs_node_blockptr(parent, slot), |
| btrfs_header_bytenr(child)); |
| } |
| if (btrfs_node_ptr_generation(parent, slot) != |
| btrfs_header_generation(child)) { |
| ret = -EINVAL; |
| fprintf(stderr, "Wrong generation of child node/leaf, wanted: %llu, have: %llu\n", |
| btrfs_header_generation(child), |
| btrfs_node_ptr_generation(parent, slot)); |
| } |
| return ret; |
| } |
| |
| /* |
| * for a tree node or leaf, if it's shared, indeed we don't need to iterate it |
| * in every fs or file tree check. Here we find its all root ids, and only check |
| * it in the fs or file tree which has the smallest root id. |
| */ |
| static int need_check(struct btrfs_root *root, struct ulist *roots) |
| { |
| struct rb_node *node; |
| struct ulist_node *u; |
| |
| if (roots->nnodes == 1) |
| return 1; |
| |
| node = rb_first(&roots->root); |
| u = rb_entry(node, struct ulist_node, rb_node); |
| /* |
| * current root id is not smallest, we skip it and let it be checked |
| * in the fs or file tree who hash the smallest root id. |
| */ |
| if (root->objectid != u->val) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* |
| * for a tree node or leaf, we record its reference count, so later if we still |
| * process this node or leaf, don't need to compute its reference count again. |
| */ |
| static int update_nodes_refs(struct btrfs_root *root, u64 bytenr, |
| struct node_refs *nrefs, u64 level) |
| { |
| int check, ret; |
| u64 refs; |
| struct ulist *roots; |
| |
| if (nrefs->bytenr[level] != bytenr) { |
| ret = btrfs_lookup_extent_info(NULL, root, bytenr, |
| level, 1, &refs, NULL); |
| if (ret < 0) |
| return ret; |
| |
| nrefs->bytenr[level] = bytenr; |
| nrefs->refs[level] = refs; |
| if (refs > 1) { |
| ret = btrfs_find_all_roots(NULL, root->fs_info, bytenr, |
| 0, &roots); |
| if (ret) |
| return -EIO; |
| |
| check = need_check(root, roots); |
| ulist_free(roots); |
| nrefs->need_check[level] = check; |
| } else { |
| nrefs->need_check[level] = 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, |
| struct walk_control *wc, int *level, |
| struct node_refs *nrefs) |
| { |
| enum btrfs_tree_block_status status; |
| u64 bytenr; |
| u64 ptr_gen; |
| struct extent_buffer *next; |
| struct extent_buffer *cur; |
| u32 blocksize; |
| int ret, err = 0; |
| u64 refs; |
| |
| WARN_ON(*level < 0); |
| WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| |
| if (path->nodes[*level]->start == nrefs->bytenr[*level]) { |
| refs = nrefs->refs[*level]; |
| ret = 0; |
| } else { |
| ret = btrfs_lookup_extent_info(NULL, root, |
| path->nodes[*level]->start, |
| *level, 1, &refs, NULL); |
| if (ret < 0) { |
| err = ret; |
| goto out; |
| } |
| nrefs->bytenr[*level] = path->nodes[*level]->start; |
| nrefs->refs[*level] = refs; |
| } |
| |
| if (refs > 1) { |
| ret = enter_shared_node(root, path->nodes[*level]->start, |
| refs, wc, *level); |
| if (ret > 0) { |
| err = ret; |
| goto out; |
| } |
| } |
| |
| while (*level >= 0) { |
| WARN_ON(*level < 0); |
| WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| cur = path->nodes[*level]; |
| |
| if (btrfs_header_level(cur) != *level) |
| WARN_ON(1); |
| |
| if (path->slots[*level] >= btrfs_header_nritems(cur)) |
| break; |
| if (*level == 0) { |
| ret = process_one_leaf(root, cur, wc); |
| if (ret < 0) |
| err = ret; |
| break; |
| } |
| bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
| ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
| blocksize = root->nodesize; |
| |
| if (bytenr == nrefs->bytenr[*level - 1]) { |
| refs = nrefs->refs[*level - 1]; |
| } else { |
| ret = btrfs_lookup_extent_info(NULL, root, bytenr, |
| *level - 1, 1, &refs, NULL); |
| if (ret < 0) { |
| refs = 0; |
| } else { |
| nrefs->bytenr[*level - 1] = bytenr; |
| nrefs->refs[*level - 1] = refs; |
| } |
| } |
| |
| if (refs > 1) { |
| ret = enter_shared_node(root, bytenr, refs, |
| wc, *level - 1); |
| if (ret > 0) { |
| path->slots[*level]++; |
| continue; |
| } |
| } |
| |
| next = btrfs_find_tree_block(root, bytenr, blocksize); |
| if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
| free_extent_buffer(next); |
| reada_walk_down(root, cur, path->slots[*level]); |
| next = read_tree_block(root, bytenr, blocksize, |
| ptr_gen); |
| if (!extent_buffer_uptodate(next)) { |
| struct btrfs_key node_key; |
| |
| btrfs_node_key_to_cpu(path->nodes[*level], |
| &node_key, |
| path->slots[*level]); |
| btrfs_add_corrupt_extent_record(root->fs_info, |
| &node_key, |
| path->nodes[*level]->start, |
| root->nodesize, *level); |
| err = -EIO; |
| goto out; |
| } |
| } |
| |
| ret = check_child_node(cur, path->slots[*level], next); |
| if (ret) { |
| free_extent_buffer(next); |
| err = ret; |
| goto out; |
| } |
| |
| if (btrfs_is_leaf(next)) |
| status = btrfs_check_leaf(root, NULL, next); |
| else |
| status = btrfs_check_node(root, NULL, next); |
| if (status != BTRFS_TREE_BLOCK_CLEAN) { |
| free_extent_buffer(next); |
| err = -EIO; |
| goto out; |
| } |
| |
| *level = *level - 1; |
| free_extent_buffer(path->nodes[*level]); |
| path->nodes[*level] = next; |
| path->slots[*level] = 0; |
| } |
| out: |
| path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
| return err; |
| } |
| |
| static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path, |
| unsigned int ext_ref); |
| |
| /* |
| * Returns >0 Found error, should continue |
| * Returns <0 Fatal error, must exit the whole check |
| * Returns 0 No errors found |
| */ |
| static int walk_down_tree_v2(struct btrfs_root *root, struct btrfs_path *path, |
| int *level, struct node_refs *nrefs, int ext_ref) |
| { |
| enum btrfs_tree_block_status status; |
| u64 bytenr; |
| u64 ptr_gen; |
| struct extent_buffer *next; |
| struct extent_buffer *cur; |
| u32 blocksize; |
| int ret; |
| |
| WARN_ON(*level < 0); |
| WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| |
| ret = update_nodes_refs(root, path->nodes[*level]->start, |
| nrefs, *level); |
| if (ret < 0) |
| return ret; |
| |
| while (*level >= 0) { |
| WARN_ON(*level < 0); |
| WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| cur = path->nodes[*level]; |
| |
| if (btrfs_header_level(cur) != *level) |
| WARN_ON(1); |
| |
| if (path->slots[*level] >= btrfs_header_nritems(cur)) |
| break; |
| /* Don't forgot to check leaf/node validation */ |
| if (*level == 0) { |
| ret = btrfs_check_leaf(root, NULL, cur); |
| if (ret != BTRFS_TREE_BLOCK_CLEAN) { |
| ret = -EIO; |
| break; |
| } |
| ret = process_one_leaf_v2(root, path, nrefs, |
| level, ext_ref); |
| break; |
| } else { |
| ret = btrfs_check_node(root, NULL, cur); |
| if (ret != BTRFS_TREE_BLOCK_CLEAN) { |
| ret = -EIO; |
| break; |
| } |
| } |
| bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
| ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
| blocksize = root->nodesize; |
| |
| ret = update_nodes_refs(root, bytenr, nrefs, *level - 1); |
| if (ret) |
| break; |
| if (!nrefs->need_check[*level - 1]) { |
| path->slots[*level]++; |
| continue; |
| } |
| |
| next = btrfs_find_tree_block(root, bytenr, blocksize); |
| if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { |
| free_extent_buffer(next); |
| reada_walk_down(root, cur, path->slots[*level]); |
| next = read_tree_block(root, bytenr, blocksize, |
| ptr_gen); |
| if (!extent_buffer_uptodate(next)) { |
| struct btrfs_key node_key; |
| |
| btrfs_node_key_to_cpu(path->nodes[*level], |
| &node_key, |
| path->slots[*level]); |
| btrfs_add_corrupt_extent_record(root->fs_info, |
| &node_key, |
| path->nodes[*level]->start, |
| root->nodesize, *level); |
| ret = -EIO; |
| break; |
| } |
| } |
| |
| ret = check_child_node(cur, path->slots[*level], next); |
| if (ret < 0) |
| break; |
| |
| if (btrfs_is_leaf(next)) |
| status = btrfs_check_leaf(root, NULL, next); |
| else |
| status = btrfs_check_node(root, NULL, next); |
| if (status != BTRFS_TREE_BLOCK_CLEAN) { |
| free_extent_buffer(next); |
| ret = -EIO; |
| break; |
| } |
| |
| *level = *level - 1; |
| free_extent_buffer(path->nodes[*level]); |
| path->nodes[*level] = next; |
| path->slots[*level] = 0; |
| } |
| return ret; |
| } |
| |
| static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path, |
| struct walk_control *wc, int *level) |
| { |
| int i; |
| struct extent_buffer *leaf; |
| |
| for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
| leaf = path->nodes[i]; |
| if (path->slots[i] + 1 < btrfs_header_nritems(leaf)) { |
| path->slots[i]++; |
| *level = i; |
| return 0; |
| } else { |
| free_extent_buffer(path->nodes[*level]); |
| path->nodes[*level] = NULL; |
| BUG_ON(*level > wc->active_node); |
| if (*level == wc->active_node) |
| leave_shared_node(root, wc, *level); |
| *level = i + 1; |
| } |
| } |
| return 1; |
| } |
| |
| static int walk_up_tree_v2(struct btrfs_root *root, struct btrfs_path *path, |
| int *level) |
| { |
| int i; |
| struct extent_buffer *leaf; |
| |
| for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
| leaf = path->nodes[i]; |
| if (path->slots[i] + 1 < btrfs_header_nritems(leaf)) { |
| path->slots[i]++; |
| *level = i; |
| return 0; |
| } else { |
| free_extent_buffer(path->nodes[*level]); |
| path->nodes[*level] = NULL; |
| *level = i + 1; |
| } |
| } |
| return 1; |
| } |
| |
| static int check_root_dir(struct inode_record *rec) |
| { |
| struct inode_backref *backref; |
| int ret = -1; |
| |
| if (!rec->found_inode_item || rec->errors) |
| goto out; |
| if (rec->nlink != 1 || rec->found_link != 0) |
| goto out; |
| if (list_empty(&rec->backrefs)) |
| goto out; |
| backref = to_inode_backref(rec->backrefs.next); |
| if (!backref->found_inode_ref) |
| goto out; |
| if (backref->index != 0 || backref->namelen != 2 || |
| memcmp(backref->name, "..", 2)) |
| goto out; |
| if (backref->found_dir_index || backref->found_dir_item) |
| goto out; |
| ret = 0; |
| out: |
| return ret; |
| } |
| |
| static int repair_inode_isize(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| struct btrfs_inode_item *ei; |
| struct btrfs_key key; |
| int ret; |
| |
| key.objectid = rec->ino; |
| key.type = BTRFS_INODE_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| if (ret < 0) |
| goto out; |
| if (ret) { |
| if (!path->slots[0]) { |
| ret = -ENOENT; |
| goto out; |
| } |
| path->slots[0]--; |
| ret = 0; |
| } |
| btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| if (key.objectid != rec->ino) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| ei = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| struct btrfs_inode_item); |
| btrfs_set_inode_size(path->nodes[0], ei, rec->found_size); |
| btrfs_mark_buffer_dirty(path->nodes[0]); |
| rec->errors &= ~I_ERR_DIR_ISIZE_WRONG; |
| printf("reset isize for dir %Lu root %Lu\n", rec->ino, |
| root->root_key.objectid); |
| out: |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| static int repair_inode_orphan_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| int ret; |
| |
| ret = btrfs_add_orphan_item(trans, root, path, rec->ino); |
| btrfs_release_path(path); |
| if (!ret) |
| rec->errors &= ~I_ERR_NO_ORPHAN_ITEM; |
| return ret; |
| } |
| |
| static int repair_inode_nbytes(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| struct btrfs_inode_item *ei; |
| struct btrfs_key key; |
| int ret = 0; |
| |
| key.objectid = rec->ino; |
| key.type = BTRFS_INODE_ITEM_KEY; |
| key.offset = 0; |
| |
| ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| if (ret) { |
| if (ret > 0) |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| /* Since ret == 0, no need to check anything */ |
| ei = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| struct btrfs_inode_item); |
| btrfs_set_inode_nbytes(path->nodes[0], ei, rec->found_size); |
| btrfs_mark_buffer_dirty(path->nodes[0]); |
| rec->errors &= ~I_ERR_FILE_NBYTES_WRONG; |
| printf("reset nbytes for ino %llu root %llu\n", |
| rec->ino, root->root_key.objectid); |
| out: |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| static int add_missing_dir_index(struct btrfs_root *root, |
| struct cache_tree *inode_cache, |
| struct inode_record *rec, |
| struct inode_backref *backref) |
| { |
| struct btrfs_path path; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_dir_item *dir_item; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| struct btrfs_disk_key disk_key; |
| struct inode_record *dir_rec; |
| unsigned long name_ptr; |
| u32 data_size = sizeof(*dir_item) + backref->namelen; |
| int ret; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| fprintf(stderr, "repairing missing dir index item for inode %llu\n", |
| (unsigned long long)rec->ino); |
| |
| btrfs_init_path(&path); |
| key.objectid = backref->dir; |
| key.type = BTRFS_DIR_INDEX_KEY; |
| key.offset = backref->index; |
| ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size); |
| BUG_ON(ret); |
| |
| leaf = path.nodes[0]; |
| dir_item = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_dir_item); |
| |
| disk_key.objectid = cpu_to_le64(rec->ino); |
| disk_key.type = BTRFS_INODE_ITEM_KEY; |
| disk_key.offset = 0; |
| |
| btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
| btrfs_set_dir_type(leaf, dir_item, imode_to_type(rec->imode)); |
| btrfs_set_dir_data_len(leaf, dir_item, 0); |
| btrfs_set_dir_name_len(leaf, dir_item, backref->namelen); |
| name_ptr = (unsigned long)(dir_item + 1); |
| write_extent_buffer(leaf, backref->name, name_ptr, backref->namelen); |
| btrfs_mark_buffer_dirty(leaf); |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, root); |
| |
| backref->found_dir_index = 1; |
| dir_rec = get_inode_rec(inode_cache, backref->dir, 0); |
| BUG_ON(IS_ERR(dir_rec)); |
| if (!dir_rec) |
| return 0; |
| dir_rec->found_size += backref->namelen; |
| if (dir_rec->found_size == dir_rec->isize && |
| (dir_rec->errors & I_ERR_DIR_ISIZE_WRONG)) |
| dir_rec->errors &= ~I_ERR_DIR_ISIZE_WRONG; |
| if (dir_rec->found_size != dir_rec->isize) |
| dir_rec->errors |= I_ERR_DIR_ISIZE_WRONG; |
| |
| return 0; |
| } |
| |
| static int delete_dir_index(struct btrfs_root *root, |
| struct inode_backref *backref) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_dir_item *di; |
| struct btrfs_path path; |
| int ret = 0; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| fprintf(stderr, "Deleting bad dir index [%llu,%u,%llu] root %llu\n", |
| (unsigned long long)backref->dir, |
| BTRFS_DIR_INDEX_KEY, (unsigned long long)backref->index, |
| (unsigned long long)root->objectid); |
| |
| btrfs_init_path(&path); |
| di = btrfs_lookup_dir_index(trans, root, &path, backref->dir, |
| backref->name, backref->namelen, |
| backref->index, -1); |
| if (IS_ERR(di)) { |
| ret = PTR_ERR(di); |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, root); |
| if (ret == -ENOENT) |
| return 0; |
| return ret; |
| } |
| |
| if (!di) |
| ret = btrfs_del_item(trans, root, &path); |
| else |
| ret = btrfs_delete_one_dir_name(trans, root, &path, di); |
| BUG_ON(ret); |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, root); |
| return ret; |
| } |
| |
| static int create_inode_item(struct btrfs_root *root, |
| struct inode_record *rec, |
| int root_dir) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_inode_item inode_item; |
| time_t now = time(NULL); |
| int ret; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| return ret; |
| } |
| |
| fprintf(stderr, "root %llu inode %llu recreating inode item, this may " |
| "be incomplete, please check permissions and content after " |
| "the fsck completes.\n", (unsigned long long)root->objectid, |
| (unsigned long long)rec->ino); |
| |
| memset(&inode_item, 0, sizeof(inode_item)); |
| btrfs_set_stack_inode_generation(&inode_item, trans->transid); |
| if (root_dir) |
| btrfs_set_stack_inode_nlink(&inode_item, 1); |
| else |
| btrfs_set_stack_inode_nlink(&inode_item, rec->found_link); |
| btrfs_set_stack_inode_nbytes(&inode_item, rec->found_size); |
| if (rec->found_dir_item) { |
| if (rec->found_file_extent) |
| fprintf(stderr, "root %llu inode %llu has both a dir " |
| "item and extents, unsure if it is a dir or a " |
| "regular file so setting it as a directory\n", |
| (unsigned long long)root->objectid, |
| (unsigned long long)rec->ino); |
| btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755); |
| btrfs_set_stack_inode_size(&inode_item, rec->found_size); |
| } else if (!rec->found_dir_item) { |
| btrfs_set_stack_inode_size(&inode_item, rec->extent_end); |
| btrfs_set_stack_inode_mode(&inode_item, S_IFREG | 0755); |
| } |
| btrfs_set_stack_timespec_sec(&inode_item.atime, now); |
| btrfs_set_stack_timespec_nsec(&inode_item.atime, 0); |
| btrfs_set_stack_timespec_sec(&inode_item.ctime, now); |
| btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0); |
| btrfs_set_stack_timespec_sec(&inode_item.mtime, now); |
| btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0); |
| btrfs_set_stack_timespec_sec(&inode_item.otime, 0); |
| btrfs_set_stack_timespec_nsec(&inode_item.otime, 0); |
| |
| ret = btrfs_insert_inode(trans, root, rec->ino, &inode_item); |
| BUG_ON(ret); |
| btrfs_commit_transaction(trans, root); |
| return 0; |
| } |
| |
| static int repair_inode_backrefs(struct btrfs_root *root, |
| struct inode_record *rec, |
| struct cache_tree *inode_cache, |
| int delete) |
| { |
| struct inode_backref *tmp, *backref; |
| u64 root_dirid = btrfs_root_dirid(&root->root_item); |
| int ret = 0; |
| int repaired = 0; |
| |
| list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { |
| if (!delete && rec->ino == root_dirid) { |
| if (!rec->found_inode_item) { |
| ret = create_inode_item(root, rec, 1); |
| if (ret) |
| break; |
| repaired++; |
| } |
| } |
| |
| /* Index 0 for root dir's are special, don't mess with it */ |
| if (rec->ino == root_dirid && backref->index == 0) |
| continue; |
| |
| if (delete && |
| ((backref->found_dir_index && !backref->found_inode_ref) || |
| (backref->found_dir_index && backref->found_inode_ref && |
| (backref->errors & REF_ERR_INDEX_UNMATCH)))) { |
| ret = delete_dir_index(root, backref); |
| if (ret) |
| break; |
| repaired++; |
| list_del(&backref->list); |
| free(backref); |
| continue; |
| } |
| |
| if (!delete && !backref->found_dir_index && |
| backref->found_dir_item && backref->found_inode_ref) { |
| ret = add_missing_dir_index(root, inode_cache, rec, |
| backref); |
| if (ret) |
| break; |
| repaired++; |
| if (backref->found_dir_item && |
| backref->found_dir_index) { |
| if (!backref->errors && |
| backref->found_inode_ref) { |
| list_del(&backref->list); |
| free(backref); |
| continue; |
| } |
| } |
| } |
| |
| if (!delete && (!backref->found_dir_index && |
| !backref->found_dir_item && |
| backref->found_inode_ref)) { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_key location; |
| |
| ret = check_dir_conflict(root, backref->name, |
| backref->namelen, |
| backref->dir, |
| backref->index); |
| if (ret) { |
| /* |
| * let nlink fixing routine to handle it, |
| * which can do it better. |
| */ |
| ret = 0; |
| break; |
| } |
| location.objectid = rec->ino; |
| location.type = BTRFS_INODE_ITEM_KEY; |
| location.offset = 0; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| break; |
| } |
| fprintf(stderr, "adding missing dir index/item pair " |
| "for inode %llu\n", |
| (unsigned long long)rec->ino); |
| ret = btrfs_insert_dir_item(trans, root, backref->name, |
| backref->namelen, |
| backref->dir, &location, |
| imode_to_type(rec->imode), |
| backref->index); |
| BUG_ON(ret); |
| btrfs_commit_transaction(trans, root); |
| repaired++; |
| } |
| |
| if (!delete && (backref->found_inode_ref && |
| backref->found_dir_index && |
| backref->found_dir_item && |
| !(backref->errors & REF_ERR_INDEX_UNMATCH) && |
| !rec->found_inode_item)) { |
| ret = create_inode_item(root, rec, 0); |
| if (ret) |
| break; |
| repaired++; |
| } |
| |
| } |
| return ret ? ret : repaired; |
| } |
| |
| /* |
| * To determine the file type for nlink/inode_item repair |
| * |
| * Return 0 if file type is found and BTRFS_FT_* is stored into type. |
| * Return -ENOENT if file type is not found. |
| */ |
| static int find_file_type(struct inode_record *rec, u8 *type) |
| { |
| struct inode_backref *backref; |
| |
| /* For inode item recovered case */ |
| if (rec->found_inode_item) { |
| *type = imode_to_type(rec->imode); |
| return 0; |
| } |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (backref->found_dir_index || backref->found_dir_item) { |
| *type = backref->filetype; |
| return 0; |
| } |
| } |
| return -ENOENT; |
| } |
| |
| /* |
| * To determine the file name for nlink repair |
| * |
| * Return 0 if file name is found, set name and namelen. |
| * Return -ENOENT if file name is not found. |
| */ |
| static int find_file_name(struct inode_record *rec, |
| char *name, int *namelen) |
| { |
| struct inode_backref *backref; |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (backref->found_dir_index || backref->found_dir_item || |
| backref->found_inode_ref) { |
| memcpy(name, backref->name, backref->namelen); |
| *namelen = backref->namelen; |
| return 0; |
| } |
| } |
| return -ENOENT; |
| } |
| |
| /* Reset the nlink of the inode to the correct one */ |
| static int reset_nlink(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| struct inode_backref *backref; |
| struct inode_backref *tmp; |
| struct btrfs_key key; |
| struct btrfs_inode_item *inode_item; |
| int ret = 0; |
| |
| /* We don't believe this either, reset it and iterate backref */ |
| rec->found_link = 0; |
| |
| /* Remove all backref including the valid ones */ |
| list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { |
| ret = btrfs_unlink(trans, root, rec->ino, backref->dir, |
| backref->index, backref->name, |
| backref->namelen, 0); |
| if (ret < 0) |
| goto out; |
| |
| /* remove invalid backref, so it won't be added back */ |
| if (!(backref->found_dir_index && |
| backref->found_dir_item && |
| backref->found_inode_ref)) { |
| list_del(&backref->list); |
| free(backref); |
| } else { |
| rec->found_link++; |
| } |
| } |
| |
| /* Set nlink to 0 */ |
| key.objectid = rec->ino; |
| key.type = BTRFS_INODE_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = -ENOENT; |
| goto out; |
| } |
| inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| struct btrfs_inode_item); |
| btrfs_set_inode_nlink(path->nodes[0], inode_item, 0); |
| btrfs_mark_buffer_dirty(path->nodes[0]); |
| btrfs_release_path(path); |
| |
| /* |
| * Add back valid inode_ref/dir_item/dir_index, |
| * add_link() will handle the nlink inc, so new nlink must be correct |
| */ |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| ret = btrfs_add_link(trans, root, rec->ino, backref->dir, |
| backref->name, backref->namelen, |
| backref->filetype, &backref->index, 1); |
| if (ret < 0) |
| goto out; |
| } |
| out: |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| static int get_highest_inode(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| u64 *highest_ino) |
| { |
| struct btrfs_key key, found_key; |
| int ret; |
| |
| btrfs_init_path(path); |
| key.objectid = BTRFS_LAST_FREE_OBJECTID; |
| key.offset = -1; |
| key.type = BTRFS_INODE_ITEM_KEY; |
| ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| if (ret == 1) { |
| btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| path->slots[0] - 1); |
| *highest_ino = found_key.objectid; |
| ret = 0; |
| } |
| if (*highest_ino >= BTRFS_LAST_FREE_OBJECTID) |
| ret = -EOVERFLOW; |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| static int repair_inode_nlinks(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| char *dir_name = "lost+found"; |
| char namebuf[BTRFS_NAME_LEN] = {0}; |
| u64 lost_found_ino; |
| u32 mode = 0700; |
| u8 type = 0; |
| int namelen = 0; |
| int name_recovered = 0; |
| int type_recovered = 0; |
| int ret = 0; |
| |
| /* |
| * Get file name and type first before these invalid inode ref |
| * are deleted by remove_all_invalid_backref() |
| */ |
| name_recovered = !find_file_name(rec, namebuf, &namelen); |
| type_recovered = !find_file_type(rec, &type); |
| |
| if (!name_recovered) { |
| printf("Can't get file name for inode %llu, using '%llu' as fallback\n", |
| rec->ino, rec->ino); |
| namelen = count_digits(rec->ino); |
| sprintf(namebuf, "%llu", rec->ino); |
| name_recovered = 1; |
| } |
| if (!type_recovered) { |
| printf("Can't get file type for inode %llu, using FILE as fallback\n", |
| rec->ino); |
| type = BTRFS_FT_REG_FILE; |
| type_recovered = 1; |
| } |
| |
| ret = reset_nlink(trans, root, path, rec); |
| if (ret < 0) { |
| fprintf(stderr, |
| "Failed to reset nlink for inode %llu: %s\n", |
| rec->ino, strerror(-ret)); |
| goto out; |
| } |
| |
| if (rec->found_link == 0) { |
| ret = get_highest_inode(trans, root, path, &lost_found_ino); |
| if (ret < 0) |
| goto out; |
| lost_found_ino++; |
| ret = btrfs_mkdir(trans, root, dir_name, strlen(dir_name), |
| BTRFS_FIRST_FREE_OBJECTID, &lost_found_ino, |
| mode); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to create '%s' dir: %s\n", |
| dir_name, strerror(-ret)); |
| goto out; |
| } |
| ret = btrfs_add_link(trans, root, rec->ino, lost_found_ino, |
| namebuf, namelen, type, NULL, 1); |
| /* |
| * Add ".INO" suffix several times to handle case where |
| * "FILENAME.INO" is already taken by another file. |
| */ |
| while (ret == -EEXIST) { |
| /* |
| * Conflicting file name, add ".INO" as suffix * +1 for '.' |
| */ |
| if (namelen + count_digits(rec->ino) + 1 > |
| BTRFS_NAME_LEN) { |
| ret = -EFBIG; |
| goto out; |
| } |
| snprintf(namebuf + namelen, BTRFS_NAME_LEN - namelen, |
| ".%llu", rec->ino); |
| namelen += count_digits(rec->ino) + 1; |
| ret = btrfs_add_link(trans, root, rec->ino, |
| lost_found_ino, namebuf, |
| namelen, type, NULL, 1); |
| } |
| if (ret < 0) { |
| fprintf(stderr, |
| "Failed to link the inode %llu to %s dir: %s\n", |
| rec->ino, dir_name, strerror(-ret)); |
| goto out; |
| } |
| /* |
| * Just increase the found_link, don't actually add the |
| * backref. This will make things easier and this inode |
| * record will be freed after the repair is done. |
| * So fsck will not report problem about this inode. |
| */ |
| rec->found_link++; |
| printf("Moving file '%.*s' to '%s' dir since it has no valid backref\n", |
| namelen, namebuf, dir_name); |
| } |
| printf("Fixed the nlink of inode %llu\n", rec->ino); |
| out: |
| /* |
| * Clear the flag anyway, or we will loop forever for the same inode |
| * as it will not be removed from the bad inode list and the dead loop |
| * happens. |
| */ |
| rec->errors &= ~I_ERR_LINK_COUNT_WRONG; |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| /* |
| * Check if there is any normal(reg or prealloc) file extent for given |
| * ino. |
| * This is used to determine the file type when neither its dir_index/item or |
| * inode_item exists. |
| * |
| * This will *NOT* report error, if any error happens, just consider it does |
| * not have any normal file extent. |
| */ |
| static int find_normal_file_extent(struct btrfs_root *root, u64 ino) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_key found_key; |
| struct btrfs_file_extent_item *fi; |
| u8 type; |
| int ret = 0; |
| |
| btrfs_init_path(&path); |
| key.objectid = ino; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| key.offset = 0; |
| |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) { |
| ret = 0; |
| goto out; |
| } |
| if (ret && path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(root, &path); |
| if (ret) { |
| ret = 0; |
| goto out; |
| } |
| } |
| while (1) { |
| btrfs_item_key_to_cpu(path.nodes[0], &found_key, |
| path.slots[0]); |
| if (found_key.objectid != ino || |
| found_key.type != BTRFS_EXTENT_DATA_KEY) |
| break; |
| fi = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_file_extent_item); |
| type = btrfs_file_extent_type(path.nodes[0], fi); |
| if (type != BTRFS_FILE_EXTENT_INLINE) { |
| ret = 1; |
| goto out; |
| } |
| } |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static u32 btrfs_type_to_imode(u8 type) |
| { |
| static u32 imode_by_btrfs_type[] = { |
| [BTRFS_FT_REG_FILE] = S_IFREG, |
| [BTRFS_FT_DIR] = S_IFDIR, |
| [BTRFS_FT_CHRDEV] = S_IFCHR, |
| [BTRFS_FT_BLKDEV] = S_IFBLK, |
| [BTRFS_FT_FIFO] = S_IFIFO, |
| [BTRFS_FT_SOCK] = S_IFSOCK, |
| [BTRFS_FT_SYMLINK] = S_IFLNK, |
| }; |
| |
| return imode_by_btrfs_type[(type)]; |
| } |
| |
| static int repair_inode_no_item(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| u8 filetype; |
| u32 mode = 0700; |
| int type_recovered = 0; |
| int ret = 0; |
| |
| printf("Trying to rebuild inode:%llu\n", rec->ino); |
| |
| type_recovered = !find_file_type(rec, &filetype); |
| |
| /* |
| * Try to determine inode type if type not found. |
| * |
| * For found regular file extent, it must be FILE. |
| * For found dir_item/index, it must be DIR. |
| * |
| * For undetermined one, use FILE as fallback. |
| * |
| * TODO: |
| * 1. If found backref(inode_index/item is already handled) to it, |
| * it must be DIR. |
| * Need new inode-inode ref structure to allow search for that. |
| */ |
| if (!type_recovered) { |
| if (rec->found_file_extent && |
| find_normal_file_extent(root, rec->ino)) { |
| type_recovered = 1; |
| filetype = BTRFS_FT_REG_FILE; |
| } else if (rec->found_dir_item) { |
| type_recovered = 1; |
| filetype = BTRFS_FT_DIR; |
| } else if (!list_empty(&rec->orphan_extents)) { |
| type_recovered = 1; |
| filetype = BTRFS_FT_REG_FILE; |
| } else{ |
| printf("Can't determine the filetype for inode %llu, assume it is a normal file\n", |
| rec->ino); |
| type_recovered = 1; |
| filetype = BTRFS_FT_REG_FILE; |
| } |
| } |
| |
| ret = btrfs_new_inode(trans, root, rec->ino, |
| mode | btrfs_type_to_imode(filetype)); |
| if (ret < 0) |
| goto out; |
| |
| /* |
| * Here inode rebuild is done, we only rebuild the inode item, |
| * don't repair the nlink(like move to lost+found). |
| * That is the job of nlink repair. |
| * |
| * We just fill the record and return |
| */ |
| rec->found_dir_item = 1; |
| rec->imode = mode | btrfs_type_to_imode(filetype); |
| rec->nlink = 0; |
| rec->errors &= ~I_ERR_NO_INODE_ITEM; |
| /* Ensure the inode_nlinks repair function will be called */ |
| rec->errors |= I_ERR_LINK_COUNT_WRONG; |
| out: |
| return ret; |
| } |
| |
| static int repair_inode_orphan_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| struct orphan_data_extent *orphan; |
| struct orphan_data_extent *tmp; |
| int ret = 0; |
| |
| list_for_each_entry_safe(orphan, tmp, &rec->orphan_extents, list) { |
| /* |
| * Check for conflicting file extents |
| * |
| * Here we don't know whether the extents is compressed or not, |
| * so we can only assume it not compressed nor data offset, |
| * and use its disk_len as extent length. |
| */ |
| ret = btrfs_get_extent(NULL, root, path, orphan->objectid, |
| orphan->offset, orphan->disk_len, 0); |
| btrfs_release_path(path); |
| if (ret < 0) |
| goto out; |
| if (!ret) { |
| fprintf(stderr, |
| "orphan extent (%llu, %llu) conflicts, delete the orphan\n", |
| orphan->disk_bytenr, orphan->disk_len); |
| ret = btrfs_free_extent(trans, |
| root->fs_info->extent_root, |
| orphan->disk_bytenr, orphan->disk_len, |
| 0, root->objectid, orphan->objectid, |
| orphan->offset); |
| if (ret < 0) |
| goto out; |
| } |
| ret = btrfs_insert_file_extent(trans, root, orphan->objectid, |
| orphan->offset, orphan->disk_bytenr, |
| orphan->disk_len, orphan->disk_len); |
| if (ret < 0) |
| goto out; |
| |
| /* Update file size info */ |
| rec->found_size += orphan->disk_len; |
| if (rec->found_size == rec->nbytes) |
| rec->errors &= ~I_ERR_FILE_NBYTES_WRONG; |
| |
| /* Update the file extent hole info too */ |
| ret = del_file_extent_hole(&rec->holes, orphan->offset, |
| orphan->disk_len); |
| if (ret < 0) |
| goto out; |
| if (RB_EMPTY_ROOT(&rec->holes)) |
| rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT; |
| |
| list_del(&orphan->list); |
| free(orphan); |
| } |
| rec->errors &= ~I_ERR_FILE_EXTENT_ORPHAN; |
| out: |
| return ret; |
| } |
| |
| static int repair_inode_discount_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct inode_record *rec) |
| { |
| struct rb_node *node; |
| struct file_extent_hole *hole; |
| int found = 0; |
| int ret = 0; |
| |
| node = rb_first(&rec->holes); |
| |
| while (node) { |
| found = 1; |
| hole = rb_entry(node, struct file_extent_hole, node); |
| ret = btrfs_punch_hole(trans, root, rec->ino, |
| hole->start, hole->len); |
| if (ret < 0) |
| goto out; |
| ret = del_file_extent_hole(&rec->holes, hole->start, |
| hole->len); |
| if (ret < 0) |
| goto out; |
| if (RB_EMPTY_ROOT(&rec->holes)) |
| rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT; |
| node = rb_first(&rec->holes); |
| } |
| /* special case for a file losing all its file extent */ |
| if (!found) { |
| ret = btrfs_punch_hole(trans, root, rec->ino, 0, |
| round_up(rec->isize, root->sectorsize)); |
| if (ret < 0) |
| goto out; |
| } |
| printf("Fixed discount file extents for inode: %llu in root: %llu\n", |
| rec->ino, root->objectid); |
| out: |
| return ret; |
| } |
| |
| static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_path path; |
| int ret = 0; |
| |
| if (!(rec->errors & (I_ERR_DIR_ISIZE_WRONG | |
| I_ERR_NO_ORPHAN_ITEM | |
| I_ERR_LINK_COUNT_WRONG | |
| I_ERR_NO_INODE_ITEM | |
| I_ERR_FILE_EXTENT_ORPHAN | |
| I_ERR_FILE_EXTENT_DISCOUNT| |
| I_ERR_FILE_NBYTES_WRONG))) |
| return rec->errors; |
| |
| /* |
| * For nlink repair, it may create a dir and add link, so |
| * 2 for parent(256)'s dir_index and dir_item |
| * 2 for lost+found dir's inode_item and inode_ref |
| * 1 for the new inode_ref of the file |
| * 2 for lost+found dir's dir_index and dir_item for the file |
| */ |
| trans = btrfs_start_transaction(root, 7); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| btrfs_init_path(&path); |
| if (rec->errors & I_ERR_NO_INODE_ITEM) |
| ret = repair_inode_no_item(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_FILE_EXTENT_ORPHAN) |
| ret = repair_inode_orphan_extent(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_FILE_EXTENT_DISCOUNT) |
| ret = repair_inode_discount_extent(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_DIR_ISIZE_WRONG) |
| ret = repair_inode_isize(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_NO_ORPHAN_ITEM) |
| ret = repair_inode_orphan_item(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_LINK_COUNT_WRONG) |
| ret = repair_inode_nlinks(trans, root, &path, rec); |
| if (!ret && rec->errors & I_ERR_FILE_NBYTES_WRONG) |
| ret = repair_inode_nbytes(trans, root, &path, rec); |
| btrfs_commit_transaction(trans, root); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int check_inode_recs(struct btrfs_root *root, |
| struct cache_tree *inode_cache) |
| { |
| struct cache_extent *cache; |
| struct ptr_node *node; |
| struct inode_record *rec; |
| struct inode_backref *backref; |
| int stage = 0; |
| int ret = 0; |
| int err = 0; |
| u64 error = 0; |
| u64 root_dirid = btrfs_root_dirid(&root->root_item); |
| |
| if (btrfs_root_refs(&root->root_item) == 0) { |
| if (!cache_tree_empty(inode_cache)) |
| fprintf(stderr, "warning line %d\n", __LINE__); |
| return 0; |
| } |
| |
| /* |
| * We need to repair backrefs first because we could change some of the |
| * errors in the inode recs. |
| * |
| * We also need to go through and delete invalid backrefs first and then |
| * add the correct ones second. We do this because we may get EEXIST |
| * when adding back the correct index because we hadn't yet deleted the |
| * invalid index. |
| * |
| * For example, if we were missing a dir index then the directories |
| * isize would be wrong, so if we fixed the isize to what we thought it |
| * would be and then fixed the backref we'd still have a invalid fs, so |
| * we need to add back the dir index and then check to see if the isize |
| * is still wrong. |
| */ |
| while (stage < 3) { |
| stage++; |
| if (stage == 3 && !err) |
| break; |
| |
| cache = search_cache_extent(inode_cache, 0); |
| while (repair && cache) { |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| cache = next_cache_extent(cache); |
| |
| /* Need to free everything up and rescan */ |
| if (stage == 3) { |
| remove_cache_extent(inode_cache, &node->cache); |
| free(node); |
| free_inode_rec(rec); |
| continue; |
| } |
| |
| if (list_empty(&rec->backrefs)) |
| continue; |
| |
| ret = repair_inode_backrefs(root, rec, inode_cache, |
| stage == 1); |
| if (ret < 0) { |
| err = ret; |
| stage = 2; |
| break; |
| } if (ret > 0) { |
| err = -EAGAIN; |
| } |
| } |
| } |
| if (err) |
| return err; |
| |
| rec = get_inode_rec(inode_cache, root_dirid, 0); |
| BUG_ON(IS_ERR(rec)); |
| if (rec) { |
| ret = check_root_dir(rec); |
| if (ret) { |
| fprintf(stderr, "root %llu root dir %llu error\n", |
| (unsigned long long)root->root_key.objectid, |
| (unsigned long long)root_dirid); |
| print_inode_error(root, rec); |
| error++; |
| } |
| } else { |
| if (repair) { |
| struct btrfs_trans_handle *trans; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| err = PTR_ERR(trans); |
| return err; |
| } |
| |
| fprintf(stderr, |
| "root %llu missing its root dir, recreating\n", |
| (unsigned long long)root->objectid); |
| |
| ret = btrfs_make_root_dir(trans, root, root_dirid); |
| BUG_ON(ret); |
| |
| btrfs_commit_transaction(trans, root); |
| return -EAGAIN; |
| } |
| |
| fprintf(stderr, "root %llu root dir %llu not found\n", |
| (unsigned long long)root->root_key.objectid, |
| (unsigned long long)root_dirid); |
| } |
| |
| while (1) { |
| cache = search_cache_extent(inode_cache, 0); |
| if (!cache) |
| break; |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| remove_cache_extent(inode_cache, &node->cache); |
| free(node); |
| if (rec->ino == root_dirid || |
| rec->ino == BTRFS_ORPHAN_OBJECTID) { |
| free_inode_rec(rec); |
| continue; |
| } |
| |
| if (rec->errors & I_ERR_NO_ORPHAN_ITEM) { |
| ret = check_orphan_item(root, rec->ino); |
| if (ret == 0) |
| rec->errors &= ~I_ERR_NO_ORPHAN_ITEM; |
| if (can_free_inode_rec(rec)) { |
| free_inode_rec(rec); |
| continue; |
| } |
| } |
| |
| if (!rec->found_inode_item) |
| rec->errors |= I_ERR_NO_INODE_ITEM; |
| if (rec->found_link != rec->nlink) |
| rec->errors |= I_ERR_LINK_COUNT_WRONG; |
| if (repair) { |
| ret = try_repair_inode(root, rec); |
| if (ret == 0 && can_free_inode_rec(rec)) { |
| free_inode_rec(rec); |
| continue; |
| } |
| ret = 0; |
| } |
| |
| if (!(repair && ret == 0)) |
| error++; |
| print_inode_error(root, rec); |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (!backref->found_dir_item) |
| backref->errors |= REF_ERR_NO_DIR_ITEM; |
| if (!backref->found_dir_index) |
| backref->errors |= REF_ERR_NO_DIR_INDEX; |
| if (!backref->found_inode_ref) |
| backref->errors |= REF_ERR_NO_INODE_REF; |
| fprintf(stderr, "\tunresolved ref dir %llu index %llu" |
| " namelen %u name %s filetype %d errors %x", |
| (unsigned long long)backref->dir, |
| (unsigned long long)backref->index, |
| backref->namelen, backref->name, |
| backref->filetype, backref->errors); |
| print_ref_error(backref->errors); |
| } |
| free_inode_rec(rec); |
| } |
| return (error > 0) ? -1 : 0; |
| } |
| |
| static struct root_record *get_root_rec(struct cache_tree *root_cache, |
| u64 objectid) |
| { |
| struct cache_extent *cache; |
| struct root_record *rec = NULL; |
| int ret; |
| |
| cache = lookup_cache_extent(root_cache, objectid, 1); |
| if (cache) { |
| rec = container_of(cache, struct root_record, cache); |
| } else { |
| rec = calloc(1, sizeof(*rec)); |
| if (!rec) |
| return ERR_PTR(-ENOMEM); |
| rec->objectid = objectid; |
| INIT_LIST_HEAD(&rec->backrefs); |
| rec->cache.start = objectid; |
| rec->cache.size = 1; |
| |
| ret = insert_cache_extent(root_cache, &rec->cache); |
| if (ret) |
| return ERR_PTR(-EEXIST); |
| } |
| return rec; |
| } |
| |
| static struct root_backref *get_root_backref(struct root_record *rec, |
| u64 ref_root, u64 dir, u64 index, |
| const char *name, int namelen) |
| { |
| struct root_backref *backref; |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (backref->ref_root != ref_root || backref->dir != dir || |
| backref->namelen != namelen) |
| continue; |
| if (memcmp(name, backref->name, namelen)) |
| continue; |
| return backref; |
| } |
| |
| backref = calloc(1, sizeof(*backref) + namelen + 1); |
| if (!backref) |
| return NULL; |
| backref->ref_root = ref_root; |
| backref->dir = dir; |
| backref->index = index; |
| backref->namelen = namelen; |
| memcpy(backref->name, name, namelen); |
| backref->name[namelen] = '\0'; |
| list_add_tail(&backref->list, &rec->backrefs); |
| return backref; |
| } |
| |
| static void free_root_record(struct cache_extent *cache) |
| { |
| struct root_record *rec; |
| struct root_backref *backref; |
| |
| rec = container_of(cache, struct root_record, cache); |
| while (!list_empty(&rec->backrefs)) { |
| backref = to_root_backref(rec->backrefs.next); |
| list_del(&backref->list); |
| free(backref); |
| } |
| |
| free(rec); |
| } |
| |
| FREE_EXTENT_CACHE_BASED_TREE(root_recs, free_root_record); |
| |
| static int add_root_backref(struct cache_tree *root_cache, |
| u64 root_id, u64 ref_root, u64 dir, u64 index, |
| const char *name, int namelen, |
| int item_type, int errors) |
| { |
| struct root_record *rec; |
| struct root_backref *backref; |
| |
| rec = get_root_rec(root_cache, root_id); |
| BUG_ON(IS_ERR(rec)); |
| backref = get_root_backref(rec, ref_root, dir, index, name, namelen); |
| BUG_ON(!backref); |
| |
| backref->errors |= errors; |
| |
| if (item_type != BTRFS_DIR_ITEM_KEY) { |
| if (backref->found_dir_index || backref->found_back_ref || |
| backref->found_forward_ref) { |
| if (backref->index != index) |
| backref->errors |= REF_ERR_INDEX_UNMATCH; |
| } else { |
| backref->index = index; |
| } |
| } |
| |
| if (item_type == BTRFS_DIR_ITEM_KEY) { |
| if (backref->found_forward_ref) |
| rec->found_ref++; |
| backref->found_dir_item = 1; |
| } else if (item_type == BTRFS_DIR_INDEX_KEY) { |
| backref->found_dir_index = 1; |
| } else if (item_type == BTRFS_ROOT_REF_KEY) { |
| if (backref->found_forward_ref) |
| backref->errors |= REF_ERR_DUP_ROOT_REF; |
| else if (backref->found_dir_item) |
| rec->found_ref++; |
| backref->found_forward_ref = 1; |
| } else if (item_type == BTRFS_ROOT_BACKREF_KEY) { |
| if (backref->found_back_ref) |
| backref->errors |= REF_ERR_DUP_ROOT_BACKREF; |
| backref->found_back_ref = 1; |
| } else { |
| BUG_ON(1); |
| } |
| |
| if (backref->found_forward_ref && backref->found_dir_item) |
| backref->reachable = 1; |
| return 0; |
| } |
| |
| static int merge_root_recs(struct btrfs_root *root, |
| struct cache_tree *src_cache, |
| struct cache_tree *dst_cache) |
| { |
| struct cache_extent *cache; |
| struct ptr_node *node; |
| struct inode_record *rec; |
| struct inode_backref *backref; |
| int ret = 0; |
| |
| if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| free_inode_recs_tree(src_cache); |
| return 0; |
| } |
| |
| while (1) { |
| cache = search_cache_extent(src_cache, 0); |
| if (!cache) |
| break; |
| node = container_of(cache, struct ptr_node, cache); |
| rec = node->data; |
| remove_cache_extent(src_cache, &node->cache); |
| free(node); |
| |
| ret = is_child_root(root, root->objectid, rec->ino); |
| if (ret < 0) |
| break; |
| else if (ret == 0) |
| goto skip; |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| BUG_ON(backref->found_inode_ref); |
| if (backref->found_dir_item) |
| add_root_backref(dst_cache, rec->ino, |
| root->root_key.objectid, backref->dir, |
| backref->index, backref->name, |
| backref->namelen, BTRFS_DIR_ITEM_KEY, |
| backref->errors); |
| if (backref->found_dir_index) |
| add_root_backref(dst_cache, rec->ino, |
| root->root_key.objectid, backref->dir, |
| backref->index, backref->name, |
| backref->namelen, BTRFS_DIR_INDEX_KEY, |
| backref->errors); |
| } |
| skip: |
| free_inode_rec(rec); |
| } |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| static int check_root_refs(struct btrfs_root *root, |
| struct cache_tree *root_cache) |
| { |
| struct root_record *rec; |
| struct root_record *ref_root; |
| struct root_backref *backref; |
| struct cache_extent *cache; |
| int loop = 1; |
| int ret; |
| int error; |
| int errors = 0; |
| |
| rec = get_root_rec(root_cache, BTRFS_FS_TREE_OBJECTID); |
| BUG_ON(IS_ERR(rec)); |
| rec->found_ref = 1; |
| |
| /* fixme: this can not detect circular references */ |
| while (loop) { |
| loop = 0; |
| cache = search_cache_extent(root_cache, 0); |
| while (1) { |
| if (!cache) |
| break; |
| rec = container_of(cache, struct root_record, cache); |
| cache = next_cache_extent(cache); |
| |
| if (rec->found_ref == 0) |
| continue; |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (!backref->reachable) |
| continue; |
| |
| ref_root = get_root_rec(root_cache, |
| backref->ref_root); |
| BUG_ON(IS_ERR(ref_root)); |
| if (ref_root->found_ref > 0) |
| continue; |
| |
| backref->reachable = 0; |
| rec->found_ref--; |
| if (rec->found_ref == 0) |
| loop = 1; |
| } |
| } |
| } |
| |
| cache = search_cache_extent(root_cache, 0); |
| while (1) { |
| if (!cache) |
| break; |
| rec = container_of(cache, struct root_record, cache); |
| cache = next_cache_extent(cache); |
| |
| if (rec->found_ref == 0 && |
| rec->objectid >= BTRFS_FIRST_FREE_OBJECTID && |
| rec->objectid <= BTRFS_LAST_FREE_OBJECTID) { |
| ret = check_orphan_item(root->fs_info->tree_root, |
| rec->objectid); |
| if (ret == 0) |
| continue; |
| |
| /* |
| * If we don't have a root item then we likely just have |
| * a dir item in a snapshot for this root but no actual |
| * ref key or anything so it's meaningless. |
| */ |
| if (!rec->found_root_item) |
| continue; |
| errors++; |
| fprintf(stderr, "fs tree %llu not referenced\n", |
| (unsigned long long)rec->objectid); |
| } |
| |
| error = 0; |
| if (rec->found_ref > 0 && !rec->found_root_item) |
| error = 1; |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (!backref->found_dir_item) |
| backref->errors |= REF_ERR_NO_DIR_ITEM; |
| if (!backref->found_dir_index) |
| backref->errors |= REF_ERR_NO_DIR_INDEX; |
| if (!backref->found_back_ref) |
| backref->errors |= REF_ERR_NO_ROOT_BACKREF; |
| if (!backref->found_forward_ref) |
| backref->errors |= REF_ERR_NO_ROOT_REF; |
| if (backref->reachable && backref->errors) |
| error = 1; |
| } |
| if (!error) |
| continue; |
| |
| errors++; |
| fprintf(stderr, "fs tree %llu refs %u %s\n", |
| (unsigned long long)rec->objectid, rec->found_ref, |
| rec->found_root_item ? "" : "not found"); |
| |
| list_for_each_entry(backref, &rec->backrefs, list) { |
| if (!backref->reachable) |
| continue; |
| if (!backref->errors && rec->found_root_item) |
| continue; |
| fprintf(stderr, "\tunresolved ref root %llu dir %llu" |
| " index %llu namelen %u name %s errors %x\n", |
| (unsigned long long)backref->ref_root, |
| (unsigned long long)backref->dir, |
| (unsigned long long)backref->index, |
| backref->namelen, backref->name, |
| backref->errors); |
| print_ref_error(backref->errors); |
| } |
| } |
| return errors > 0 ? 1 : 0; |
| } |
| |
| static int process_root_ref(struct extent_buffer *eb, int slot, |
| struct btrfs_key *key, |
| struct cache_tree *root_cache) |
| { |
| u64 dirid; |
| u64 index; |
| u32 len; |
| u32 name_len; |
| struct btrfs_root_ref *ref; |
| char namebuf[BTRFS_NAME_LEN]; |
| int error; |
| |
| ref = btrfs_item_ptr(eb, slot, struct btrfs_root_ref); |
| |
| dirid = btrfs_root_ref_dirid(eb, ref); |
| index = btrfs_root_ref_sequence(eb, ref); |
| name_len = btrfs_root_ref_name_len(eb, ref); |
| |
| if (name_len <= BTRFS_NAME_LEN) { |
| len = name_len; |
| error = 0; |
| } else { |
| len = BTRFS_NAME_LEN; |
| error = REF_ERR_NAME_TOO_LONG; |
| } |
| read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len); |
| |
| if (key->type == BTRFS_ROOT_REF_KEY) { |
| add_root_backref(root_cache, key->offset, key->objectid, dirid, |
| index, namebuf, len, key->type, error); |
| } else { |
| add_root_backref(root_cache, key->objectid, key->offset, dirid, |
| index, namebuf, len, key->type, error); |
| } |
| return 0; |
| } |
| |
| static void free_corrupt_block(struct cache_extent *cache) |
| { |
| struct btrfs_corrupt_block *corrupt; |
| |
| corrupt = container_of(cache, struct btrfs_corrupt_block, cache); |
| free(corrupt); |
| } |
| |
| FREE_EXTENT_CACHE_BASED_TREE(corrupt_blocks, free_corrupt_block); |
| |
| /* |
| * Repair the btree of the given root. |
| * |
| * The fix is to remove the node key in corrupt_blocks cache_tree. |
| * and rebalance the tree. |
| * After the fix, the btree should be writeable. |
| */ |
| static int repair_btree(struct btrfs_root *root, |
| struct cache_tree *corrupt_blocks) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_path path; |
| struct btrfs_corrupt_block *corrupt; |
| struct cache_extent *cache; |
| struct btrfs_key key; |
| u64 offset; |
| int level; |
| int ret = 0; |
| |
| if (cache_tree_empty(corrupt_blocks)) |
| return 0; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| fprintf(stderr, "Error starting transaction: %s\n", |
| strerror(-ret)); |
| return ret; |
| } |
| btrfs_init_path(&path); |
| cache = first_cache_extent(corrupt_blocks); |
| while (cache) { |
| corrupt = container_of(cache, struct btrfs_corrupt_block, |
| cache); |
| level = corrupt->level; |
| path.lowest_level = level; |
| key.objectid = corrupt->key.objectid; |
| key.type = corrupt->key.type; |
| key.offset = corrupt->key.offset; |
| |
| /* |
| * Here we don't want to do any tree balance, since it may |
| * cause a balance with corrupted brother leaf/node, |
| * so ins_len set to 0 here. |
| * Balance will be done after all corrupt node/leaf is deleted. |
| */ |
| ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); |
| if (ret < 0) |
| goto out; |
| offset = btrfs_node_blockptr(path.nodes[level], |
| path.slots[level]); |
| |
| /* Remove the ptr */ |
| ret = btrfs_del_ptr(root, &path, level, path.slots[level]); |
| if (ret < 0) |
| goto out; |
| /* |
| * Remove the corresponding extent |
| * return value is not concerned. |
| */ |
| btrfs_release_path(&path); |
| ret = btrfs_free_extent(trans, root, offset, root->nodesize, |
| 0, root->root_key.objectid, |
| level - 1, 0); |
| cache = next_cache_extent(cache); |
| } |
| |
| /* Balance the btree using btrfs_search_slot() */ |
| cache = first_cache_extent(corrupt_blocks); |
| while (cache) { |
| corrupt = container_of(cache, struct btrfs_corrupt_block, |
| cache); |
| memcpy(&key, &corrupt->key, sizeof(key)); |
| ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); |
| if (ret < 0) |
| goto out; |
| /* return will always >0 since it won't find the item */ |
| ret = 0; |
| btrfs_release_path(&path); |
| cache = next_cache_extent(cache); |
| } |
| out: |
| btrfs_commit_transaction(trans, root); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int check_fs_root(struct btrfs_root *root, |
| struct cache_tree *root_cache, |
| struct walk_control *wc) |
| { |
| int ret = 0; |
| int err = 0; |
| int wret; |
| int level; |
| struct btrfs_path path; |
| struct shared_node root_node; |
| struct root_record *rec; |
| struct btrfs_root_item *root_item = &root->root_item; |
| struct cache_tree corrupt_blocks; |
| struct orphan_data_extent *orphan; |
| struct orphan_data_extent *tmp; |
| enum btrfs_tree_block_status status; |
| struct node_refs nrefs; |
| |
| /* |
| * Reuse the corrupt_block cache tree to record corrupted tree block |
| * |
| * Unlike the usage in extent tree check, here we do it in a per |
| * fs/subvol tree base. |
| */ |
| cache_tree_init(&corrupt_blocks); |
| root->fs_info->corrupt_blocks = &corrupt_blocks; |
| |
| if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
| rec = get_root_rec(root_cache, root->root_key.objectid); |
| BUG_ON(IS_ERR(rec)); |
| if (btrfs_root_refs(root_item) > 0) |
| rec->found_root_item = 1; |
| } |
| |
| btrfs_init_path(&path); |
| memset(&root_node, 0, sizeof(root_node)); |
| cache_tree_init(&root_node.root_cache); |
| cache_tree_init(&root_node.inode_cache); |
| memset(&nrefs, 0, sizeof(nrefs)); |
| |
| /* Move the orphan extent record to corresponding inode_record */ |
| list_for_each_entry_safe(orphan, tmp, |
| &root->orphan_data_extents, list) { |
| struct inode_record *inode; |
| |
| inode = get_inode_rec(&root_node.inode_cache, orphan->objectid, |
| 1); |
| BUG_ON(IS_ERR(inode)); |
| inode->errors |= I_ERR_FILE_EXTENT_ORPHAN; |
| list_move(&orphan->list, &inode->orphan_extents); |
| } |
| |
| level = btrfs_header_level(root->node); |
| memset(wc->nodes, 0, sizeof(wc->nodes)); |
| wc->nodes[level] = &root_node; |
| wc->active_node = level; |
| wc->root_level = level; |
| |
| /* We may not have checked the root block, lets do that now */ |
| if (btrfs_is_leaf(root->node)) |
| status = btrfs_check_leaf(root, NULL, root->node); |
| else |
| status = btrfs_check_node(root, NULL, root->node); |
| if (status != BTRFS_TREE_BLOCK_CLEAN) |
| return -EIO; |
| |
| if (btrfs_root_refs(root_item) > 0 || |
| btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| path.nodes[level] = root->node; |
| extent_buffer_get(root->node); |
| path.slots[level] = 0; |
| } else { |
| struct btrfs_key key; |
| struct btrfs_disk_key found_key; |
| |
| btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
| level = root_item->drop_level; |
| path.lowest_level = level; |
| if (level > btrfs_header_level(root->node) || |
| level >= BTRFS_MAX_LEVEL) { |
| error("ignoring invalid drop level: %u", level); |
| goto skip_walking; |
| } |
| wret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (wret < 0) |
| goto skip_walking; |
| btrfs_node_key(path.nodes[level], &found_key, |
| path.slots[level]); |
| WARN_ON(memcmp(&found_key, &root_item->drop_progress, |
| sizeof(found_key))); |
| } |
| |
| while (1) { |
| wret = walk_down_tree(root, &path, wc, &level, &nrefs); |
| if (wret < 0) |
| ret = wret; |
| if (wret != 0) |
| break; |
| |
| wret = walk_up_tree(root, &path, wc, &level); |
| if (wret < 0) |
| ret = wret; |
| if (wret != 0) |
| break; |
| } |
| skip_walking: |
| btrfs_release_path(&path); |
| |
| if (!cache_tree_empty(&corrupt_blocks)) { |
| struct cache_extent *cache; |
| struct btrfs_corrupt_block *corrupt; |
| |
| printf("The following tree block(s) is corrupted in tree %llu:\n", |
| root->root_key.objectid); |
| cache = first_cache_extent(&corrupt_blocks); |
| while (cache) { |
| corrupt = container_of(cache, |
| struct btrfs_corrupt_block, |
| cache); |
| printf("\ttree block bytenr: %llu, level: %d, node key: (%llu, %u, %llu)\n", |
| cache->start, corrupt->level, |
| corrupt->key.objectid, corrupt->key.type, |
| corrupt->key.offset); |
| cache = next_cache_extent(cache); |
| } |
| if (repair) { |
| printf("Try to repair the btree for root %llu\n", |
| root->root_key.objectid); |
| ret = repair_btree(root, &corrupt_blocks); |
| if (ret < 0) |
| fprintf(stderr, "Failed to repair btree: %s\n", |
| strerror(-ret)); |
| if (!ret) |
| printf("Btree for root %llu is fixed\n", |
| root->root_key.objectid); |
| } |
| } |
| |
| err = merge_root_recs(root, &root_node.root_cache, root_cache); |
| if (err < 0) |
| ret = err; |
| |
| if (root_node.current) { |
| root_node.current->checked = 1; |
| maybe_free_inode_rec(&root_node.inode_cache, |
| root_node.current); |
| } |
| |
| err = check_inode_recs(root, &root_node.inode_cache); |
| if (!ret) |
| ret = err; |
| |
| free_corrupt_blocks_tree(&corrupt_blocks); |
| root->fs_info->corrupt_blocks = NULL; |
| free_orphan_data_extents(&root->orphan_data_extents); |
| return ret; |
| } |
| |
| static int fs_root_objectid(u64 objectid) |
| { |
| if (objectid == BTRFS_TREE_RELOC_OBJECTID || |
| objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| return 1; |
| return is_fstree(objectid); |
| } |
| |
| static int check_fs_roots(struct btrfs_root *root, |
| struct cache_tree *root_cache) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct walk_control wc; |
| struct extent_buffer *leaf, *tree_node; |
| struct btrfs_root *tmp_root; |
| struct btrfs_root *tree_root = root->fs_info->tree_root; |
| int ret; |
| int err = 0; |
| |
| if (ctx.progress_enabled) { |
| ctx.tp = TASK_FS_ROOTS; |
| task_start(ctx.info); |
| } |
| |
| /* |
| * Just in case we made any changes to the extent tree that weren't |
| * reflected into the free space cache yet. |
| */ |
| if (repair) |
| reset_cached_block_groups(root->fs_info); |
| memset(&wc, 0, sizeof(wc)); |
| cache_tree_init(&wc.shared); |
| btrfs_init_path(&path); |
| |
| again: |
| key.offset = 0; |
| key.objectid = 0; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| err = 1; |
| goto out; |
| } |
| tree_node = tree_root->node; |
| while (1) { |
| if (tree_node != tree_root->node) { |
| free_root_recs_tree(root_cache); |
| btrfs_release_path(&path); |
| goto again; |
| } |
| leaf = path.nodes[0]; |
| if (path.slots[0] >= btrfs_header_nritems(leaf)) { |
| ret = btrfs_next_leaf(tree_root, &path); |
| if (ret) { |
| if (ret < 0) |
| err = 1; |
| break; |
| } |
| leaf = path.nodes[0]; |
| } |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.type == BTRFS_ROOT_ITEM_KEY && |
| fs_root_objectid(key.objectid)) { |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| tmp_root = btrfs_read_fs_root_no_cache( |
| root->fs_info, &key); |
| } else { |
| key.offset = (u64)-1; |
| tmp_root = btrfs_read_fs_root( |
| root->fs_info, &key); |
| } |
| if (IS_ERR(tmp_root)) { |
| err = 1; |
| goto next; |
| } |
| ret = check_fs_root(tmp_root, root_cache, &wc); |
| if (ret == -EAGAIN) { |
| free_root_recs_tree(root_cache); |
| btrfs_release_path(&path); |
| goto again; |
| } |
| if (ret) |
| err = 1; |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| btrfs_free_fs_root(tmp_root); |
| } else if (key.type == BTRFS_ROOT_REF_KEY || |
| key.type == BTRFS_ROOT_BACKREF_KEY) { |
| process_root_ref(leaf, path.slots[0], &key, |
| root_cache); |
| } |
| next: |
| path.slots[0]++; |
| } |
| out: |
| btrfs_release_path(&path); |
| if (err) |
| free_extent_cache_tree(&wc.shared); |
| if (!cache_tree_empty(&wc.shared)) |
| fprintf(stderr, "warning line %d\n", __LINE__); |
| |
| task_stop(ctx.info); |
| |
| return err; |
| } |
| |
| /* |
| * Find DIR_ITEM/DIR_INDEX for the given key and check it with the specified |
| * INODE_REF/INODE_EXTREF match. |
| * |
| * @root: the root of the fs/file tree |
| * @ref_key: the key of the INODE_REF/INODE_EXTREF |
| * @key: the key of the DIR_ITEM/DIR_INDEX |
| * @index: the index in the INODE_REF/INODE_EXTREF, be used to |
| * distinguish root_dir between normal dir/file |
| * @name: the name in the INODE_REF/INODE_EXTREF |
| * @namelen: the length of name in the INODE_REF/INODE_EXTREF |
| * @mode: the st_mode of INODE_ITEM |
| * |
| * Return 0 if no error occurred. |
| * Return ROOT_DIR_ERROR if found DIR_ITEM/DIR_INDEX for root_dir. |
| * Return DIR_ITEM_MISSING if couldn't find DIR_ITEM/DIR_INDEX for normal |
| * dir/file. |
| * Return DIR_ITEM_MISMATCH if INODE_REF/INODE_EXTREF and DIR_ITEM/DIR_INDEX |
| * not match for normal dir/file. |
| */ |
| static int find_dir_item(struct btrfs_root *root, struct btrfs_key *ref_key, |
| struct btrfs_key *key, u64 index, char *name, |
| u32 namelen, u32 mode) |
| { |
| struct btrfs_path path; |
| struct extent_buffer *node; |
| struct btrfs_dir_item *di; |
| struct btrfs_key location; |
| char namebuf[BTRFS_NAME_LEN] = {0}; |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u32 data_len; |
| u8 filetype; |
| int slot; |
| int ret; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, root, key, &path, 0, 0); |
| if (ret < 0) { |
| ret = DIR_ITEM_MISSING; |
| goto out; |
| } |
| |
| /* Process root dir and goto out*/ |
| if (index == 0) { |
| if (ret == 0) { |
| ret = ROOT_DIR_ERROR; |
| error( |
| "root %llu INODE %s[%llu %llu] ROOT_DIR shouldn't have %s", |
| root->objectid, |
| ref_key->type == BTRFS_INODE_REF_KEY ? |
| "REF" : "EXTREF", |
| ref_key->objectid, ref_key->offset, |
| key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX"); |
| } else { |
| ret = 0; |
| } |
| |
| goto out; |
| } |
| |
| /* Process normal file/dir */ |
| if (ret > 0) { |
| ret = DIR_ITEM_MISSING; |
| error( |
| "root %llu INODE %s[%llu %llu] doesn't have related %s[%llu %llu] namelen %u filename %s filetype %d", |
| root->objectid, |
| ref_key->type == BTRFS_INODE_REF_KEY ? "REF" : "EXTREF", |
| ref_key->objectid, ref_key->offset, |
| key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", |
| key->objectid, key->offset, namelen, name, |
| imode_to_type(mode)); |
| goto out; |
| } |
| |
| /* Check whether inode_id/filetype/name match */ |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| di = btrfs_item_ptr(node, slot, struct btrfs_dir_item); |
| total = btrfs_item_size_nr(node, slot); |
| while (cur < total) { |
| ret = DIR_ITEM_MISMATCH; |
| name_len = btrfs_dir_name_len(node, di); |
| data_len = btrfs_dir_data_len(node, di); |
| |
| btrfs_dir_item_key_to_cpu(node, di, &location); |
| if (location.objectid != ref_key->objectid || |
| location.type != BTRFS_INODE_ITEM_KEY || |
| location.offset != 0) |
| goto next; |
| |
| filetype = btrfs_dir_type(node, di); |
| if (imode_to_type(mode) != filetype) |
| goto next; |
| |
| if (cur + sizeof(*di) + name_len > total || |
| name_len > BTRFS_NAME_LEN) { |
| warning("root %llu %s[%llu %llu] name too long %u, trimmed", |
| root->objectid, |
| key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", |
| key->objectid, key->offset, name_len); |
| |
| if (cur + sizeof(*di) > total) |
| break; |
| len = min_t(u32, total - cur - sizeof(*di), |
| BTRFS_NAME_LEN); |
| } else { |
| len = name_len; |
| } |
| |
| read_extent_buffer(node, namebuf, (unsigned long)(di + 1), len); |
| if (len != namelen || strncmp(namebuf, name, len)) |
| goto next; |
| |
| ret = 0; |
| goto out; |
| next: |
| len = sizeof(*di) + name_len + data_len; |
| di = (struct btrfs_dir_item *)((char *)di + len); |
| cur += len; |
| } |
| if (ret == DIR_ITEM_MISMATCH) |
| error( |
| "root %llu INODE %s[%llu %llu] and %s[%llu %llu] mismatch namelen %u filename %s filetype %d", |
| root->objectid, |
| ref_key->type == BTRFS_INODE_REF_KEY ? "REF" : "EXTREF", |
| ref_key->objectid, ref_key->offset, |
| key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", |
| key->objectid, key->offset, namelen, name, |
| imode_to_type(mode)); |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * Traverse the given INODE_REF and call find_dir_item() to find related |
| * DIR_ITEM/DIR_INDEX. |
| * |
| * @root: the root of the fs/file tree |
| * @ref_key: the key of the INODE_REF |
| * @refs: the count of INODE_REF |
| * @mode: the st_mode of INODE_ITEM |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_inode_ref(struct btrfs_root *root, struct btrfs_key *ref_key, |
| struct extent_buffer *node, int slot, u64 *refs, |
| int mode) |
| { |
| struct btrfs_key key; |
| struct btrfs_inode_ref *ref; |
| char namebuf[BTRFS_NAME_LEN] = {0}; |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u64 index; |
| int ret, err = 0; |
| |
| ref = btrfs_item_ptr(node, slot, struct btrfs_inode_ref); |
| total = btrfs_item_size_nr(node, slot); |
| |
| next: |
| /* Update inode ref count */ |
| (*refs)++; |
| |
| index = btrfs_inode_ref_index(node, ref); |
| name_len = btrfs_inode_ref_name_len(node, ref); |
| if (cur + sizeof(*ref) + name_len > total || |
| name_len > BTRFS_NAME_LEN) { |
| warning("root %llu INODE_REF[%llu %llu] name too long", |
| root->objectid, ref_key->objectid, ref_key->offset); |
| |
| if (total < cur + sizeof(*ref)) |
| goto out; |
| len = min_t(u32, total - cur - sizeof(*ref), BTRFS_NAME_LEN); |
| } else { |
| len = name_len; |
| } |
| |
| read_extent_buffer(node, namebuf, (unsigned long)(ref + 1), len); |
| |
| /* Check root dir ref name */ |
| if (index == 0 && strncmp(namebuf, "..", name_len)) { |
| error("root %llu INODE_REF[%llu %llu] ROOT_DIR name shouldn't be %s", |
| root->objectid, ref_key->objectid, ref_key->offset, |
| namebuf); |
| err |= ROOT_DIR_ERROR; |
| } |
| |
| /* Find related DIR_INDEX */ |
| key.objectid = ref_key->offset; |
| key.type = BTRFS_DIR_INDEX_KEY; |
| key.offset = index; |
| ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode); |
| err |= ret; |
| |
| /* Find related dir_item */ |
| key.objectid = ref_key->offset; |
| key.type = BTRFS_DIR_ITEM_KEY; |
| key.offset = btrfs_name_hash(namebuf, len); |
| ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode); |
| err |= ret; |
| |
| len = sizeof(*ref) + name_len; |
| ref = (struct btrfs_inode_ref *)((char *)ref + len); |
| cur += len; |
| if (cur < total) |
| goto next; |
| |
| out: |
| return err; |
| } |
| |
| /* |
| * Traverse the given INODE_EXTREF and call find_dir_item() to find related |
| * DIR_ITEM/DIR_INDEX. |
| * |
| * @root: the root of the fs/file tree |
| * @ref_key: the key of the INODE_EXTREF |
| * @refs: the count of INODE_EXTREF |
| * @mode: the st_mode of INODE_ITEM |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_inode_extref(struct btrfs_root *root, |
| struct btrfs_key *ref_key, |
| struct extent_buffer *node, int slot, u64 *refs, |
| int mode) |
| { |
| struct btrfs_key key; |
| struct btrfs_inode_extref *extref; |
| char namebuf[BTRFS_NAME_LEN] = {0}; |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u64 index; |
| u64 parent; |
| int ret; |
| int err = 0; |
| |
| extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref); |
| total = btrfs_item_size_nr(node, slot); |
| |
| next: |
| /* update inode ref count */ |
| (*refs)++; |
| name_len = btrfs_inode_extref_name_len(node, extref); |
| index = btrfs_inode_extref_index(node, extref); |
| parent = btrfs_inode_extref_parent(node, extref); |
| if (name_len <= BTRFS_NAME_LEN) { |
| len = name_len; |
| } else { |
| len = BTRFS_NAME_LEN; |
| warning("root %llu INODE_EXTREF[%llu %llu] name too long", |
| root->objectid, ref_key->objectid, ref_key->offset); |
| } |
| read_extent_buffer(node, namebuf, (unsigned long)(extref + 1), len); |
| |
| /* Check root dir ref name */ |
| if (index == 0 && strncmp(namebuf, "..", name_len)) { |
| error("root %llu INODE_EXTREF[%llu %llu] ROOT_DIR name shouldn't be %s", |
| root->objectid, ref_key->objectid, ref_key->offset, |
| namebuf); |
| err |= ROOT_DIR_ERROR; |
| } |
| |
| /* find related dir_index */ |
| key.objectid = parent; |
| key.type = BTRFS_DIR_INDEX_KEY; |
| key.offset = index; |
| ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode); |
| err |= ret; |
| |
| /* find related dir_item */ |
| key.objectid = parent; |
| key.type = BTRFS_DIR_ITEM_KEY; |
| key.offset = btrfs_name_hash(namebuf, len); |
| ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode); |
| err |= ret; |
| |
| len = sizeof(*extref) + name_len; |
| extref = (struct btrfs_inode_extref *)((char *)extref + len); |
| cur += len; |
| |
| if (cur < total) |
| goto next; |
| |
| return err; |
| } |
| |
| /* |
| * Find INODE_REF/INODE_EXTREF for the given key and check it with the specified |
| * DIR_ITEM/DIR_INDEX match. |
| * |
| * @root: the root of the fs/file tree |
| * @key: the key of the INODE_REF/INODE_EXTREF |
| * @name: the name in the INODE_REF/INODE_EXTREF |
| * @namelen: the length of name in the INODE_REF/INODE_EXTREF |
| * @index: the index in the INODE_REF/INODE_EXTREF, for DIR_ITEM set index |
| * to (u64)-1 |
| * @ext_ref: the EXTENDED_IREF feature |
| * |
| * Return 0 if no error occurred. |
| * Return >0 for error bitmap |
| */ |
| static int find_inode_ref(struct btrfs_root *root, struct btrfs_key *key, |
| char *name, int namelen, u64 index, |
| unsigned int ext_ref) |
| { |
| struct btrfs_path path; |
| struct btrfs_inode_ref *ref; |
| struct btrfs_inode_extref *extref; |
| struct extent_buffer *node; |
| char ref_namebuf[BTRFS_NAME_LEN] = {0}; |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 ref_namelen; |
| u64 ref_index; |
| u64 parent; |
| u64 dir_id; |
| int slot; |
| int ret; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, root, key, &path, 0, 0); |
| if (ret) { |
| ret = INODE_REF_MISSING; |
| goto extref; |
| } |
| |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| |
| ref = btrfs_item_ptr(node, slot, struct btrfs_inode_ref); |
| total = btrfs_item_size_nr(node, slot); |
| |
| /* Iterate all entry of INODE_REF */ |
| while (cur < total) { |
| ret = INODE_REF_MISSING; |
| |
| ref_namelen = btrfs_inode_ref_name_len(node, ref); |
| ref_index = btrfs_inode_ref_index(node, ref); |
| if (index != (u64)-1 && index != ref_index) |
| goto next_ref; |
| |
| if (cur + sizeof(*ref) + ref_namelen > total || |
| ref_namelen > BTRFS_NAME_LEN) { |
| warning("root %llu INODE %s[%llu %llu] name too long", |
| root->objectid, |
| key->type == BTRFS_INODE_REF_KEY ? |
| "REF" : "EXTREF", |
| key->objectid, key->offset); |
| |
| if (cur + sizeof(*ref) > total) |
| break; |
| len = min_t(u32, total - cur - sizeof(*ref), |
| BTRFS_NAME_LEN); |
| } else { |
| len = ref_namelen; |
| } |
| |
| read_extent_buffer(node, ref_namebuf, (unsigned long)(ref + 1), |
| len); |
| |
| if (len != namelen || strncmp(ref_namebuf, name, len)) |
| goto next_ref; |
| |
| ret = 0; |
| goto out; |
| next_ref: |
| len = sizeof(*ref) + ref_namelen; |
| ref = (struct btrfs_inode_ref *)((char *)ref + len); |
| cur += len; |
| } |
| |
| extref: |
| /* Skip if not support EXTENDED_IREF feature */ |
| if (!ext_ref) |
| goto out; |
| |
| btrfs_release_path(&path); |
| btrfs_init_path(&path); |
| |
| dir_id = key->offset; |
| key->type = BTRFS_INODE_EXTREF_KEY; |
| key->offset = btrfs_extref_hash(dir_id, name, namelen); |
| |
| ret = btrfs_search_slot(NULL, root, key, &path, 0, 0); |
| if (ret) { |
| ret = INODE_REF_MISSING; |
| goto out; |
| } |
| |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| |
| extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref); |
| cur = 0; |
| total = btrfs_item_size_nr(node, slot); |
| |
| /* Iterate all entry of INODE_EXTREF */ |
| while (cur < total) { |
| ret = INODE_REF_MISSING; |
| |
| ref_namelen = btrfs_inode_extref_name_len(node, extref); |
| ref_index = btrfs_inode_extref_index(node, extref); |
| parent = btrfs_inode_extref_parent(node, extref); |
| if (index != (u64)-1 && index != ref_index) |
| goto next_extref; |
| |
| if (parent != dir_id) |
| goto next_extref; |
| |
| if (ref_namelen <= BTRFS_NAME_LEN) { |
| len = ref_namelen; |
| } else { |
| len = BTRFS_NAME_LEN; |
| warning("root %llu INODE %s[%llu %llu] name too long", |
| root->objectid, |
| key->type == BTRFS_INODE_REF_KEY ? |
| "REF" : "EXTREF", |
| key->objectid, key->offset); |
| } |
| read_extent_buffer(node, ref_namebuf, |
| (unsigned long)(extref + 1), len); |
| |
| if (len != namelen || strncmp(ref_namebuf, name, len)) |
| goto next_extref; |
| |
| ret = 0; |
| goto out; |
| |
| next_extref: |
| len = sizeof(*extref) + ref_namelen; |
| extref = (struct btrfs_inode_extref *)((char *)extref + len); |
| cur += len; |
| |
| } |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * Traverse the given DIR_ITEM/DIR_INDEX and check related INODE_ITEM and |
| * call find_inode_ref() to check related INODE_REF/INODE_EXTREF. |
| * |
| * @root: the root of the fs/file tree |
| * @key: the key of the INODE_REF/INODE_EXTREF |
| * @size: the st_size of the INODE_ITEM |
| * @ext_ref: the EXTENDED_IREF feature |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_dir_item(struct btrfs_root *root, struct btrfs_key *key, |
| struct extent_buffer *node, int slot, u64 *size, |
| unsigned int ext_ref) |
| { |
| struct btrfs_dir_item *di; |
| struct btrfs_inode_item *ii; |
| struct btrfs_path path; |
| struct btrfs_key location; |
| char namebuf[BTRFS_NAME_LEN] = {0}; |
| u32 total; |
| u32 cur = 0; |
| u32 len; |
| u32 name_len; |
| u32 data_len; |
| u8 filetype; |
| u32 mode; |
| u64 index; |
| int ret; |
| int err = 0; |
| |
| /* |
| * For DIR_ITEM set index to (u64)-1, so that find_inode_ref |
| * ignore index check. |
| */ |
| index = (key->type == BTRFS_DIR_INDEX_KEY) ? key->offset : (u64)-1; |
| |
| di = btrfs_item_ptr(node, slot, struct btrfs_dir_item); |
| total = btrfs_item_size_nr(node, slot); |
| |
| while (cur < total) { |
| data_len = btrfs_dir_data_len(node, di); |
| if (data_len) |
| error("root %llu %s[%llu %llu] data_len shouldn't be %u", |
| root->objectid, key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", |
| key->objectid, key->offset, data_len); |
| |
| name_len = btrfs_dir_name_len(node, di); |
| if (cur + sizeof(*di) + name_len > total || |
| name_len > BTRFS_NAME_LEN) { |
| warning("root %llu %s[%llu %llu] name too long", |
| root->objectid, |
| key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", |
| key->objectid, key->offset); |
| |
| if (cur + sizeof(*di) > total) |
| break; |
| len = min_t(u32, total - cur - sizeof(*di), |
| BTRFS_NAME_LEN); |
| } else { |
| len = name_len; |
| } |
| (*size) += name_len; |
| |
| read_extent_buffer(node, namebuf, (unsigned long)(di + 1), len); |
| filetype = btrfs_dir_type(node, di); |
| |
| btrfs_init_path(&path); |
| btrfs_dir_item_key_to_cpu(node, di, &location); |
| |
| /* Ignore related ROOT_ITEM check */ |
| if (location.type == BTRFS_ROOT_ITEM_KEY) |
| goto next; |
| |
| /* Check relative INODE_ITEM(existence/filetype) */ |
| ret = btrfs_search_slot(NULL, root, &location, &path, 0, 0); |
| if (ret) { |
| err |= INODE_ITEM_MISSING; |
| error("root %llu %s[%llu %llu] couldn't find relative INODE_ITEM[%llu] namelen %u filename %s filetype %x", |
| root->objectid, key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", key->objectid, |
| key->offset, location.objectid, name_len, |
| namebuf, filetype); |
| goto next; |
| } |
| |
| ii = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_inode_item); |
| mode = btrfs_inode_mode(path.nodes[0], ii); |
| |
| if (imode_to_type(mode) != filetype) { |
| err |= INODE_ITEM_MISMATCH; |
| error("root %llu %s[%llu %llu] relative INODE_ITEM filetype mismatch namelen %u filename %s filetype %d", |
| root->objectid, key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", key->objectid, |
| key->offset, name_len, namebuf, filetype); |
| } |
| |
| /* Check relative INODE_REF/INODE_EXTREF */ |
| location.type = BTRFS_INODE_REF_KEY; |
| location.offset = key->objectid; |
| ret = find_inode_ref(root, &location, namebuf, len, |
| index, ext_ref); |
| err |= ret; |
| if (ret & INODE_REF_MISSING) |
| error("root %llu %s[%llu %llu] relative INODE_REF missing namelen %u filename %s filetype %d", |
| root->objectid, key->type == BTRFS_DIR_ITEM_KEY ? |
| "DIR_ITEM" : "DIR_INDEX", key->objectid, |
| key->offset, name_len, namebuf, filetype); |
| |
| next: |
| btrfs_release_path(&path); |
| len = sizeof(*di) + name_len + data_len; |
| di = (struct btrfs_dir_item *)((char *)di + len); |
| cur += len; |
| |
| if (key->type == BTRFS_DIR_INDEX_KEY && cur < total) { |
| error("root %llu DIR_INDEX[%llu %llu] should contain only one entry", |
| root->objectid, key->objectid, key->offset); |
| break; |
| } |
| } |
| |
| return err; |
| } |
| |
| /* |
| * Check file extent datasum/hole, update the size of the file extents, |
| * check and update the last offset of the file extent. |
| * |
| * @root: the root of fs/file tree. |
| * @fkey: the key of the file extent. |
| * @nodatasum: INODE_NODATASUM feature. |
| * @size: the sum of all EXTENT_DATA items size for this inode. |
| * @end: the offset of the last extent. |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey, |
| struct extent_buffer *node, int slot, |
| unsigned int nodatasum, u64 *size, u64 *end) |
| { |
| struct btrfs_file_extent_item *fi; |
| u64 disk_bytenr; |
| u64 disk_num_bytes; |
| u64 extent_num_bytes; |
| u64 extent_offset; |
| u64 csum_found; /* In byte size, sectorsize aligned */ |
| u64 search_start; /* Logical range start we search for csum */ |
| u64 search_len; /* Logical range len we search for csum */ |
| unsigned int extent_type; |
| unsigned int is_hole; |
| int compressed = 0; |
| int ret; |
| int err = 0; |
| |
| fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item); |
| |
| /* Check inline extent */ |
| extent_type = btrfs_file_extent_type(node, fi); |
| if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| struct btrfs_item *e = btrfs_item_nr(slot); |
| u32 item_inline_len; |
| |
| item_inline_len = btrfs_file_extent_inline_item_len(node, e); |
| extent_num_bytes = btrfs_file_extent_inline_len(node, slot, fi); |
| compressed = btrfs_file_extent_compression(node, fi); |
| if (extent_num_bytes == 0) { |
| error( |
| "root %llu EXTENT_DATA[%llu %llu] has empty inline extent", |
| root->objectid, fkey->objectid, fkey->offset); |
| err |= FILE_EXTENT_ERROR; |
| } |
| if (!compressed && extent_num_bytes != item_inline_len) { |
| error( |
| "root %llu EXTENT_DATA[%llu %llu] wrong inline size, have: %llu, expected: %u", |
| root->objectid, fkey->objectid, fkey->offset, |
| extent_num_bytes, item_inline_len); |
| err |= FILE_EXTENT_ERROR; |
| } |
| *size += extent_num_bytes; |
| return err; |
| } |
| |
| /* Check extent type */ |
| if (extent_type != BTRFS_FILE_EXTENT_REG && |
| extent_type != BTRFS_FILE_EXTENT_PREALLOC) { |
| err |= FILE_EXTENT_ERROR; |
| error("root %llu EXTENT_DATA[%llu %llu] type bad", |
| root->objectid, fkey->objectid, fkey->offset); |
| return err; |
| } |
| |
| /* Check REG_EXTENT/PREALLOC_EXTENT */ |
| disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi); |
| disk_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi); |
| extent_num_bytes = btrfs_file_extent_num_bytes(node, fi); |
| extent_offset = btrfs_file_extent_offset(node, fi); |
| compressed = btrfs_file_extent_compression(node, fi); |
| is_hole = (disk_bytenr == 0) && (disk_num_bytes == 0); |
| |
| /* |
| * Check EXTENT_DATA csum |
| * |
| * For plain (uncompressed) extent, we should only check the range |
| * we're referring to, as it's possible that part of prealloc extent |
| * has been written, and has csum: |
| * |
| * |<--- Original large preallocated extent A ---->| |
| * |<- Prealloc File Extent ->|<- Regular Extent ->| |
| * No csum Has csum |
| * |
| * For compressed extent, we should check the whole range. |
| */ |
| if (!compressed) { |
| search_start = disk_bytenr + extent_offset; |
| search_len = extent_num_bytes; |
| } else { |
| search_start = disk_bytenr; |
| search_len = disk_num_bytes; |
| } |
| ret = count_csum_range(root, search_start, search_len, &csum_found); |
| if (csum_found > 0 && nodatasum) { |
| err |= ODD_CSUM_ITEM; |
| error("root %llu EXTENT_DATA[%llu %llu] nodatasum shouldn't have datasum", |
| root->objectid, fkey->objectid, fkey->offset); |
| } else if (extent_type == BTRFS_FILE_EXTENT_REG && !nodatasum && |
| !is_hole && (ret < 0 || csum_found < search_len)) { |
| err |= CSUM_ITEM_MISSING; |
| error("root %llu EXTENT_DATA[%llu %llu] csum missing, have: %llu, expected: %llu", |
| root->objectid, fkey->objectid, fkey->offset, |
| csum_found, search_len); |
| } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC && csum_found > 0) { |
| err |= ODD_CSUM_ITEM; |
| error("root %llu EXTENT_DATA[%llu %llu] prealloc shouldn't have csum, but has: %llu", |
| root->objectid, fkey->objectid, fkey->offset, csum_found); |
| } |
| |
| /* Check EXTENT_DATA hole */ |
| if (no_holes && is_hole) { |
| err |= FILE_EXTENT_ERROR; |
| error("root %llu EXTENT_DATA[%llu %llu] shouldn't be hole", |
| root->objectid, fkey->objectid, fkey->offset); |
| } else if (!no_holes && *end != fkey->offset) { |
| err |= FILE_EXTENT_ERROR; |
| error("root %llu EXTENT_DATA[%llu %llu] interrupt", |
| root->objectid, fkey->objectid, fkey->offset); |
| } |
| |
| *end += extent_num_bytes; |
| if (!is_hole) |
| *size += extent_num_bytes; |
| |
| return err; |
| } |
| |
| /* |
| * Check INODE_ITEM and related ITEMs (the same inode number) |
| * 1. check link count |
| * 2. check inode ref/extref |
| * 3. check dir item/index |
| * |
| * @ext_ref: the EXTENDED_IREF feature |
| * |
| * Return 0 if no error occurred. |
| * Return >0 for error or hit the traversal is done(by error bitmap) |
| */ |
| static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path, |
| unsigned int ext_ref) |
| { |
| struct extent_buffer *node; |
| struct btrfs_inode_item *ii; |
| struct btrfs_key key; |
| u64 inode_id; |
| u32 mode; |
| u64 nlink; |
| u64 nbytes; |
| u64 isize; |
| u64 size = 0; |
| u64 refs = 0; |
| u64 extent_end = 0; |
| u64 extent_size = 0; |
| unsigned int dir; |
| unsigned int nodatasum; |
| int slot; |
| int ret; |
| int err = 0; |
| |
| node = path->nodes[0]; |
| slot = path->slots[0]; |
| |
| btrfs_item_key_to_cpu(node, &key, slot); |
| inode_id = key.objectid; |
| |
| if (inode_id == BTRFS_ORPHAN_OBJECTID) { |
| ret = btrfs_next_item(root, path); |
| if (ret > 0) |
| err |= LAST_ITEM; |
| return err; |
| } |
| |
| ii = btrfs_item_ptr(node, slot, struct btrfs_inode_item); |
| isize = btrfs_inode_size(node, ii); |
| nbytes = btrfs_inode_nbytes(node, ii); |
| mode = btrfs_inode_mode(node, ii); |
| dir = imode_to_type(mode) == BTRFS_FT_DIR; |
| nlink = btrfs_inode_nlink(node, ii); |
| nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM; |
| |
| while (1) { |
| ret = btrfs_next_item(root, path); |
| if (ret < 0) { |
| /* out will fill 'err' rusing current statistics */ |
| goto out; |
| } else if (ret > 0) { |
| err |= LAST_ITEM; |
| goto out; |
| } |
| |
| node = path->nodes[0]; |
| slot = path->slots[0]; |
| btrfs_item_key_to_cpu(node, &key, slot); |
| if (key.objectid != inode_id) |
| goto out; |
| |
| switch (key.type) { |
| case BTRFS_INODE_REF_KEY: |
| ret = check_inode_ref(root, &key, node, slot, &refs, |
| mode); |
| err |= ret; |
| break; |
| case BTRFS_INODE_EXTREF_KEY: |
| if (key.type == BTRFS_INODE_EXTREF_KEY && !ext_ref) |
| warning("root %llu EXTREF[%llu %llu] isn't supported", |
| root->objectid, key.objectid, |
| key.offset); |
| ret = check_inode_extref(root, &key, node, slot, &refs, |
| mode); |
| err |= ret; |
| break; |
| case BTRFS_DIR_ITEM_KEY: |
| case BTRFS_DIR_INDEX_KEY: |
| if (!dir) { |
| warning("root %llu INODE[%llu] mode %u shouldn't have DIR_INDEX[%llu %llu]", |
| root->objectid, inode_id, |
| imode_to_type(mode), key.objectid, |
| key.offset); |
| } |
| ret = check_dir_item(root, &key, node, slot, &size, |
| ext_ref); |
| err |= ret; |
| break; |
| case BTRFS_EXTENT_DATA_KEY: |
| if (dir) { |
| warning("root %llu DIR INODE[%llu] shouldn't EXTENT_DATA[%llu %llu]", |
| root->objectid, inode_id, key.objectid, |
| key.offset); |
| } |
| ret = check_file_extent(root, &key, node, slot, |
| nodatasum, &extent_size, |
| &extent_end); |
| err |= ret; |
| break; |
| case BTRFS_XATTR_ITEM_KEY: |
| break; |
| default: |
| error("ITEM[%llu %u %llu] UNKNOWN TYPE", |
| key.objectid, key.type, key.offset); |
| } |
| } |
| |
| out: |
| /* verify INODE_ITEM nlink/isize/nbytes */ |
| if (dir) { |
| if (nlink != 1) { |
| err |= LINK_COUNT_ERROR; |
| error("root %llu DIR INODE[%llu] shouldn't have more than one link(%llu)", |
| root->objectid, inode_id, nlink); |
| } |
| |
| /* |
| * Just a warning, as dir inode nbytes is just an |
| * instructive value. |
| */ |
| if (!IS_ALIGNED(nbytes, root->nodesize)) { |
| warning("root %llu DIR INODE[%llu] nbytes should be aligned to %u", |
| root->objectid, inode_id, root->nodesize); |
| } |
| |
| if (isize != size) { |
| err |= ISIZE_ERROR; |
| error("root %llu DIR INODE [%llu] size(%llu) not equal to %llu", |
| root->objectid, inode_id, isize, size); |
| } |
| } else { |
| if (nlink != refs) { |
| err |= LINK_COUNT_ERROR; |
| error("root %llu INODE[%llu] nlink(%llu) not equal to inode_refs(%llu)", |
| root->objectid, inode_id, nlink, refs); |
| } else if (!nlink) { |
| err |= ORPHAN_ITEM; |
| } |
| |
| if (!nbytes && !no_holes && extent_end < isize) { |
| err |= NBYTES_ERROR; |
| error("root %llu INODE[%llu] size (%llu) should have a file extent hole", |
| root->objectid, inode_id, isize); |
| } |
| |
| if (nbytes != extent_size) { |
| err |= NBYTES_ERROR; |
| error("root %llu INODE[%llu] nbytes(%llu) not equal to extent_size(%llu)", |
| root->objectid, inode_id, nbytes, extent_size); |
| } |
| } |
| |
| return err; |
| } |
| |
| static int check_fs_first_inode(struct btrfs_root *root, unsigned int ext_ref) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| int err = 0; |
| int ret; |
| |
| key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| key.type = BTRFS_INODE_ITEM_KEY; |
| key.offset = 0; |
| |
| /* For root being dropped, we don't need to check first inode */ |
| if (btrfs_root_refs(&root->root_item) == 0 && |
| btrfs_disk_key_objectid(&root->root_item.drop_progress) >= |
| key.objectid) |
| return 0; |
| |
| btrfs_init_path(&path); |
| |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = 0; |
| err |= INODE_ITEM_MISSING; |
| error("first inode item of root %llu is missing", |
| root->objectid); |
| } |
| |
| err |= check_inode_item(root, &path, ext_ref); |
| err &= ~LAST_ITEM; |
| if (err && !ret) |
| ret = -EIO; |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * Iterate all item on the tree and call check_inode_item() to check. |
| * |
| * @root: the root of the tree to be checked. |
| * @ext_ref: the EXTENDED_IREF feature |
| * |
| * Return 0 if no error found. |
| * Return <0 for error. |
| */ |
| static int check_fs_root_v2(struct btrfs_root *root, unsigned int ext_ref) |
| { |
| struct btrfs_path path; |
| struct node_refs nrefs; |
| struct btrfs_root_item *root_item = &root->root_item; |
| int ret; |
| int level; |
| int err = 0; |
| |
| /* |
| * We need to manually check the first inode item(256) |
| * As the following traversal function will only start from |
| * the first inode item in the leaf, if inode item(256) is missing |
| * we will just skip it forever. |
| */ |
| ret = check_fs_first_inode(root, ext_ref); |
| if (ret < 0) |
| return ret; |
| |
| memset(&nrefs, 0, sizeof(nrefs)); |
| level = btrfs_header_level(root->node); |
| btrfs_init_path(&path); |
| |
| if (btrfs_root_refs(root_item) > 0 || |
| btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| path.nodes[level] = root->node; |
| path.slots[level] = 0; |
| extent_buffer_get(root->node); |
| } else { |
| struct btrfs_key key; |
| |
| btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
| level = root_item->drop_level; |
| path.lowest_level = level; |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| ret = 0; |
| } |
| |
| while (1) { |
| ret = walk_down_tree_v2(root, &path, &level, &nrefs, ext_ref); |
| err |= !!ret; |
| |
| /* if ret is negative, walk shall stop */ |
| if (ret < 0) { |
| ret = err; |
| break; |
| } |
| |
| ret = walk_up_tree_v2(root, &path, &level); |
| if (ret != 0) { |
| /* Normal exit, reset ret to err */ |
| ret = err; |
| break; |
| } |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * Find the relative ref for root_ref and root_backref. |
| * |
| * @root: the root of the root tree. |
| * @ref_key: the key of the root ref. |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_root_ref(struct btrfs_root *root, struct btrfs_key *ref_key, |
| struct extent_buffer *node, int slot) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_root_ref *ref; |
| struct btrfs_root_ref *backref; |
| char ref_name[BTRFS_NAME_LEN] = {0}; |
| char backref_name[BTRFS_NAME_LEN] = {0}; |
| u64 ref_dirid; |
| u64 ref_seq; |
| u32 ref_namelen; |
| u64 backref_dirid; |
| u64 backref_seq; |
| u32 backref_namelen; |
| u32 len; |
| int ret; |
| int err = 0; |
| |
| ref = btrfs_item_ptr(node, slot, struct btrfs_root_ref); |
| ref_dirid = btrfs_root_ref_dirid(node, ref); |
| ref_seq = btrfs_root_ref_sequence(node, ref); |
| ref_namelen = btrfs_root_ref_name_len(node, ref); |
| |
| if (ref_namelen <= BTRFS_NAME_LEN) { |
| len = ref_namelen; |
| } else { |
| len = BTRFS_NAME_LEN; |
| warning("%s[%llu %llu] ref_name too long", |
| ref_key->type == BTRFS_ROOT_REF_KEY ? |
| "ROOT_REF" : "ROOT_BACKREF", ref_key->objectid, |
| ref_key->offset); |
| } |
| read_extent_buffer(node, ref_name, (unsigned long)(ref + 1), len); |
| |
| /* Find relative root_ref */ |
| key.objectid = ref_key->offset; |
| key.type = BTRFS_ROOT_BACKREF_KEY + BTRFS_ROOT_REF_KEY - ref_key->type; |
| key.offset = ref_key->objectid; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret) { |
| err |= ROOT_REF_MISSING; |
| error("%s[%llu %llu] couldn't find relative ref", |
| ref_key->type == BTRFS_ROOT_REF_KEY ? |
| "ROOT_REF" : "ROOT_BACKREF", |
| ref_key->objectid, ref_key->offset); |
| goto out; |
| } |
| |
| backref = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_root_ref); |
| backref_dirid = btrfs_root_ref_dirid(path.nodes[0], backref); |
| backref_seq = btrfs_root_ref_sequence(path.nodes[0], backref); |
| backref_namelen = btrfs_root_ref_name_len(path.nodes[0], backref); |
| |
| if (backref_namelen <= BTRFS_NAME_LEN) { |
| len = backref_namelen; |
| } else { |
| len = BTRFS_NAME_LEN; |
| warning("%s[%llu %llu] ref_name too long", |
| key.type == BTRFS_ROOT_REF_KEY ? |
| "ROOT_REF" : "ROOT_BACKREF", |
| key.objectid, key.offset); |
| } |
| read_extent_buffer(path.nodes[0], backref_name, |
| (unsigned long)(backref + 1), len); |
| |
| if (ref_dirid != backref_dirid || ref_seq != backref_seq || |
| ref_namelen != backref_namelen || |
| strncmp(ref_name, backref_name, len)) { |
| err |= ROOT_REF_MISMATCH; |
| error("%s[%llu %llu] mismatch relative ref", |
| ref_key->type == BTRFS_ROOT_REF_KEY ? |
| "ROOT_REF" : "ROOT_BACKREF", |
| ref_key->objectid, ref_key->offset); |
| } |
| out: |
| btrfs_release_path(&path); |
| return err; |
| } |
| |
| /* |
| * Check all fs/file tree in low_memory mode. |
| * |
| * 1. for fs tree root item, call check_fs_root_v2() |
| * 2. for fs tree root ref/backref, call check_root_ref() |
| * |
| * Return 0 if no error occurred. |
| */ |
| static int check_fs_roots_v2(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_root *tree_root = fs_info->tree_root; |
| struct btrfs_root *cur_root = NULL; |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct extent_buffer *node; |
| unsigned int ext_ref; |
| int slot; |
| int ret; |
| int err = 0; |
| |
| ext_ref = btrfs_fs_incompat(fs_info, EXTENDED_IREF); |
| |
| btrfs_init_path(&path); |
| key.objectid = BTRFS_FS_TREE_OBJECTID; |
| key.offset = 0; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| |
| ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| err = ret; |
| goto out; |
| } else if (ret > 0) { |
| err = -ENOENT; |
| goto out; |
| } |
| |
| while (1) { |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| btrfs_item_key_to_cpu(node, &key, slot); |
| if (key.objectid > BTRFS_LAST_FREE_OBJECTID) |
| goto out; |
| if (key.type == BTRFS_ROOT_ITEM_KEY && |
| fs_root_objectid(key.objectid)) { |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) { |
| cur_root = btrfs_read_fs_root_no_cache(fs_info, |
| &key); |
| } else { |
| key.offset = (u64)-1; |
| cur_root = btrfs_read_fs_root(fs_info, &key); |
| } |
| |
| if (IS_ERR(cur_root)) { |
| error("Fail to read fs/subvol tree: %lld", |
| key.objectid); |
| err = -EIO; |
| goto next; |
| } |
| |
| ret = check_fs_root_v2(cur_root, ext_ref); |
| err |= ret; |
| |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| btrfs_free_fs_root(cur_root); |
| } else if (key.type == BTRFS_ROOT_REF_KEY || |
| key.type == BTRFS_ROOT_BACKREF_KEY) { |
| ret = check_root_ref(tree_root, &key, node, slot); |
| err |= ret; |
| } |
| next: |
| ret = btrfs_next_item(tree_root, &path); |
| if (ret > 0) |
| goto out; |
| if (ret < 0) { |
| err = ret; |
| goto out; |
| } |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| return err; |
| } |
| |
| static int all_backpointers_checked(struct extent_record *rec, int print_errs) |
| { |
| struct list_head *cur = rec->backrefs.next; |
| struct extent_backref *back; |
| struct tree_backref *tback; |
| struct data_backref *dback; |
| u64 found = 0; |
| int err = 0; |
| |
| while(cur != &rec->backrefs) { |
| back = to_extent_backref(cur); |
| cur = cur->next; |
| if (!back->found_extent_tree) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| if (back->is_data) { |
| dback = to_data_backref(back); |
| fprintf(stderr, "Backref %llu %s %llu" |
| " owner %llu offset %llu num_refs %lu" |
| " not found in extent tree\n", |
| (unsigned long long)rec->start, |
| back->full_backref ? |
| "parent" : "root", |
| back->full_backref ? |
| (unsigned long long)dback->parent: |
| (unsigned long long)dback->root, |
| (unsigned long long)dback->owner, |
| (unsigned long long)dback->offset, |
| (unsigned long)dback->num_refs); |
| } else { |
| tback = to_tree_backref(back); |
| fprintf(stderr, "Backref %llu parent %llu" |
| " root %llu not found in extent tree\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)tback->parent, |
| (unsigned long long)tback->root); |
| } |
| } |
| if (!back->is_data && !back->found_ref) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| tback = to_tree_backref(back); |
| fprintf(stderr, "Backref %llu %s %llu not referenced back %p\n", |
| (unsigned long long)rec->start, |
| back->full_backref ? "parent" : "root", |
| back->full_backref ? |
| (unsigned long long)tback->parent : |
| (unsigned long long)tback->root, back); |
| } |
| if (back->is_data) { |
| dback = to_data_backref(back); |
| if (dback->found_ref != dback->num_refs) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| fprintf(stderr, "Incorrect local backref count" |
| " on %llu %s %llu owner %llu" |
| " offset %llu found %u wanted %u back %p\n", |
| (unsigned long long)rec->start, |
| back->full_backref ? |
| "parent" : "root", |
| back->full_backref ? |
| (unsigned long long)dback->parent: |
| (unsigned long long)dback->root, |
| (unsigned long long)dback->owner, |
| (unsigned long long)dback->offset, |
| dback->found_ref, dback->num_refs, back); |
| } |
| if (dback->disk_bytenr != rec->start) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| fprintf(stderr, "Backref disk bytenr does not" |
| " match extent record, bytenr=%llu, " |
| "ref bytenr=%llu\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)dback->disk_bytenr); |
| } |
| |
| if (dback->bytes != rec->nr) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| fprintf(stderr, "Backref bytes do not match " |
| "extent backref, bytenr=%llu, ref " |
| "bytes=%llu, backref bytes=%llu\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)rec->nr, |
| (unsigned long long)dback->bytes); |
| } |
| } |
| if (!back->is_data) { |
| found += 1; |
| } else { |
| dback = to_data_backref(back); |
| found += dback->found_ref; |
| } |
| } |
| if (found != rec->refs) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| fprintf(stderr, "Incorrect global backref count " |
| "on %llu found %llu wanted %llu\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)found, |
| (unsigned long long)rec->refs); |
| } |
| out: |
| return err; |
| } |
| |
| static int free_all_extent_backrefs(struct extent_record *rec) |
| { |
| struct extent_backref *back; |
| struct list_head *cur; |
| while (!list_empty(&rec->backrefs)) { |
| cur = rec->backrefs.next; |
| back = to_extent_backref(cur); |
| list_del(cur); |
| free(back); |
| } |
| return 0; |
| } |
| |
| static void free_extent_record_cache(struct cache_tree *extent_cache) |
| { |
| struct cache_extent *cache; |
| struct extent_record *rec; |
| |
| while (1) { |
| cache = first_cache_extent(extent_cache); |
| if (!cache) |
| break; |
| rec = container_of(cache, struct extent_record, cache); |
| remove_cache_extent(extent_cache, cache); |
| free_all_extent_backrefs(rec); |
| free(rec); |
| } |
| } |
| |
| static int maybe_free_extent_rec(struct cache_tree *extent_cache, |
| struct extent_record *rec) |
| { |
| if (rec->content_checked && rec->owner_ref_checked && |
| rec->extent_item_refs == rec->refs && rec->refs > 0 && |
| rec->num_duplicates == 0 && !all_backpointers_checked(rec, 0) && |
| !rec->bad_full_backref && !rec->crossing_stripes && |
| !rec->wrong_chunk_type) { |
| remove_cache_extent(extent_cache, &rec->cache); |
| free_all_extent_backrefs(rec); |
| list_del_init(&rec->list); |
| free(rec); |
| } |
| return 0; |
| } |
| |
| static int check_owner_ref(struct btrfs_root *root, |
| struct extent_record *rec, |
| struct extent_buffer *buf) |
| { |
| struct extent_backref *node; |
| struct tree_backref *back; |
| struct btrfs_root *ref_root; |
| struct btrfs_key key; |
| struct btrfs_path path; |
| struct extent_buffer *parent; |
| int level; |
| int found = 0; |
| int ret; |
| |
| list_for_each_entry(node, &rec->backrefs, list) { |
| if (node->is_data) |
| continue; |
| if (!node->found_ref) |
| continue; |
| if (node->full_backref) |
| continue; |
| back = to_tree_backref(node); |
| if (btrfs_header_owner(buf) == back->root) |
| return 0; |
| } |
| BUG_ON(rec->is_root); |
| |
| /* try to find the block by search corresponding fs tree */ |
| key.objectid = btrfs_header_owner(buf); |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| ref_root = btrfs_read_fs_root(root->fs_info, &key); |
| if (IS_ERR(ref_root)) |
| return 1; |
| |
| level = btrfs_header_level(buf); |
| if (level == 0) |
| btrfs_item_key_to_cpu(buf, &key, 0); |
| else |
| btrfs_node_key_to_cpu(buf, &key, 0); |
| |
| btrfs_init_path(&path); |
| path.lowest_level = level + 1; |
| ret = btrfs_search_slot(NULL, ref_root, &key, &path, 0, 0); |
| if (ret < 0) |
| return 0; |
| |
| parent = path.nodes[level + 1]; |
| if (parent && buf->start == btrfs_node_blockptr(parent, |
| path.slots[level + 1])) |
| found = 1; |
| |
| btrfs_release_path(&path); |
| return found ? 0 : 1; |
| } |
| |
| static int is_extent_tree_record(struct extent_record *rec) |
| { |
| struct list_head *cur = rec->backrefs.next; |
| struct extent_backref *node; |
| struct tree_backref *back; |
| int is_extent = 0; |
| |
| while(cur != &rec->backrefs) { |
| node = to_extent_backref(cur); |
| cur = cur->next; |
| if (node->is_data) |
| return 0; |
| back = to_tree_backref(node); |
| if (node->full_backref) |
| return 0; |
| if (back->root == BTRFS_EXTENT_TREE_OBJECTID) |
| is_extent = 1; |
| } |
| return is_extent; |
| } |
| |
| |
| static int record_bad_block_io(struct btrfs_fs_info *info, |
| struct cache_tree *extent_cache, |
| u64 start, u64 len) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| struct btrfs_key key; |
| |
| cache = lookup_cache_extent(extent_cache, start, len); |
| if (!cache) |
| return 0; |
| |
| rec = container_of(cache, struct extent_record, cache); |
| if (!is_extent_tree_record(rec)) |
| return 0; |
| |
| btrfs_disk_key_to_cpu(&key, &rec->parent_key); |
| return btrfs_add_corrupt_extent_record(info, &key, start, len, 0); |
| } |
| |
| static int swap_values(struct btrfs_root *root, struct btrfs_path *path, |
| struct extent_buffer *buf, int slot) |
| { |
| if (btrfs_header_level(buf)) { |
| struct btrfs_key_ptr ptr1, ptr2; |
| |
| read_extent_buffer(buf, &ptr1, btrfs_node_key_ptr_offset(slot), |
| sizeof(struct btrfs_key_ptr)); |
| read_extent_buffer(buf, &ptr2, |
| btrfs_node_key_ptr_offset(slot + 1), |
| sizeof(struct btrfs_key_ptr)); |
| write_extent_buffer(buf, &ptr1, |
| btrfs_node_key_ptr_offset(slot + 1), |
| sizeof(struct btrfs_key_ptr)); |
| write_extent_buffer(buf, &ptr2, |
| btrfs_node_key_ptr_offset(slot), |
| sizeof(struct btrfs_key_ptr)); |
| if (slot == 0) { |
| struct btrfs_disk_key key; |
| btrfs_node_key(buf, &key, 0); |
| btrfs_fixup_low_keys(root, path, &key, |
| btrfs_header_level(buf) + 1); |
| } |
| } else { |
| struct btrfs_item *item1, *item2; |
| struct btrfs_key k1, k2; |
| char *item1_data, *item2_data; |
| u32 item1_offset, item2_offset, item1_size, item2_size; |
| |
| item1 = btrfs_item_nr(slot); |
| item2 = btrfs_item_nr(slot + 1); |
| btrfs_item_key_to_cpu(buf, &k1, slot); |
| btrfs_item_key_to_cpu(buf, &k2, slot + 1); |
| item1_offset = btrfs_item_offset(buf, item1); |
| item2_offset = btrfs_item_offset(buf, item2); |
| item1_size = btrfs_item_size(buf, item1); |
| item2_size = btrfs_item_size(buf, item2); |
| |
| item1_data = malloc(item1_size); |
| if (!item1_data) |
| return -ENOMEM; |
| item2_data = malloc(item2_size); |
| if (!item2_data) { |
| free(item1_data); |
| return -ENOMEM; |
| } |
| |
| read_extent_buffer(buf, item1_data, item1_offset, item1_size); |
| read_extent_buffer(buf, item2_data, item2_offset, item2_size); |
| |
| write_extent_buffer(buf, item1_data, item2_offset, item2_size); |
| write_extent_buffer(buf, item2_data, item1_offset, item1_size); |
| free(item1_data); |
| free(item2_data); |
| |
| btrfs_set_item_offset(buf, item1, item2_offset); |
| btrfs_set_item_offset(buf, item2, item1_offset); |
| btrfs_set_item_size(buf, item1, item2_size); |
| btrfs_set_item_size(buf, item2, item1_size); |
| |
| path->slots[0] = slot; |
| btrfs_set_item_key_unsafe(root, path, &k2); |
| path->slots[0] = slot + 1; |
| btrfs_set_item_key_unsafe(root, path, &k1); |
| } |
| return 0; |
| } |
| |
| static int fix_key_order(struct btrfs_root *root, struct btrfs_path *path) |
| { |
| struct extent_buffer *buf; |
| struct btrfs_key k1, k2; |
| int i; |
| int level = path->lowest_level; |
| int ret = -EIO; |
| |
| buf = path->nodes[level]; |
| for (i = 0; i < btrfs_header_nritems(buf) - 1; i++) { |
| if (level) { |
| btrfs_node_key_to_cpu(buf, &k1, i); |
| btrfs_node_key_to_cpu(buf, &k2, i + 1); |
| } else { |
| btrfs_item_key_to_cpu(buf, &k1, i); |
| btrfs_item_key_to_cpu(buf, &k2, i + 1); |
| } |
| if (btrfs_comp_cpu_keys(&k1, &k2) < 0) |
| continue; |
| ret = swap_values(root, path, buf, i); |
| if (ret) |
| break; |
| btrfs_mark_buffer_dirty(buf); |
| i = 0; |
| } |
| return ret; |
| } |
| |
| static int delete_bogus_item(struct btrfs_root *root, |
| struct btrfs_path *path, |
| struct extent_buffer *buf, int slot) |
| { |
| struct btrfs_key key; |
| int nritems = btrfs_header_nritems(buf); |
| |
| btrfs_item_key_to_cpu(buf, &key, slot); |
| |
| /* These are all the keys we can deal with missing. */ |
| if (key.type != BTRFS_DIR_INDEX_KEY && |
| key.type != BTRFS_EXTENT_ITEM_KEY && |
| key.type != BTRFS_METADATA_ITEM_KEY && |
| key.type != BTRFS_TREE_BLOCK_REF_KEY && |
| key.type != BTRFS_EXTENT_DATA_REF_KEY) |
| return -1; |
| |
| printf("Deleting bogus item [%llu,%u,%llu] at slot %d on block %llu\n", |
| (unsigned long long)key.objectid, key.type, |
| (unsigned long long)key.offset, slot, buf->start); |
| memmove_extent_buffer(buf, btrfs_item_nr_offset(slot), |
| btrfs_item_nr_offset(slot + 1), |
| sizeof(struct btrfs_item) * |
| (nritems - slot - 1)); |
| btrfs_set_header_nritems(buf, nritems - 1); |
| if (slot == 0) { |
| struct btrfs_disk_key disk_key; |
| |
| btrfs_item_key(buf, &disk_key, 0); |
| btrfs_fixup_low_keys(root, path, &disk_key, 1); |
| } |
| btrfs_mark_buffer_dirty(buf); |
| return 0; |
| } |
| |
| static int fix_item_offset(struct btrfs_root *root, struct btrfs_path *path) |
| { |
| struct extent_buffer *buf; |
| int i; |
| int ret = 0; |
| |
| /* We should only get this for leaves */ |
| BUG_ON(path->lowest_level); |
| buf = path->nodes[0]; |
| again: |
| for (i = 0; i < btrfs_header_nritems(buf); i++) { |
| unsigned int shift = 0, offset; |
| |
| if (i == 0 && btrfs_item_end_nr(buf, i) != |
| BTRFS_LEAF_DATA_SIZE(root)) { |
| if (btrfs_item_end_nr(buf, i) > |
| BTRFS_LEAF_DATA_SIZE(root)) { |
| ret = delete_bogus_item(root, path, buf, i); |
| if (!ret) |
| goto again; |
| fprintf(stderr, "item is off the end of the " |
| "leaf, can't fix\n"); |
| ret = -EIO; |
| break; |
| } |
| shift = BTRFS_LEAF_DATA_SIZE(root) - |
| btrfs_item_end_nr(buf, i); |
| } else if (i > 0 && btrfs_item_end_nr(buf, i) != |
| btrfs_item_offset_nr(buf, i - 1)) { |
| if (btrfs_item_end_nr(buf, i) > |
| btrfs_item_offset_nr(buf, i - 1)) { |
| ret = delete_bogus_item(root, path, buf, i); |
| if (!ret) |
| goto again; |
| fprintf(stderr, "items overlap, can't fix\n"); |
| ret = -EIO; |
| break; |
| } |
| shift = btrfs_item_offset_nr(buf, i - 1) - |
| btrfs_item_end_nr(buf, i); |
| } |
| if (!shift) |
| continue; |
| |
| printf("Shifting item nr %d by %u bytes in block %llu\n", |
| i, shift, (unsigned long long)buf->start); |
| offset = btrfs_item_offset_nr(buf, i); |
| memmove_extent_buffer(buf, |
| btrfs_leaf_data(buf) + offset + shift, |
| btrfs_leaf_data(buf) + offset, |
| btrfs_item_size_nr(buf, i)); |
| btrfs_set_item_offset(buf, btrfs_item_nr(i), |
| offset + shift); |
| btrfs_mark_buffer_dirty(buf); |
| } |
| |
| /* |
| * We may have moved things, in which case we want to exit so we don't |
| * write those changes out. Once we have proper abort functionality in |
| * progs this can be changed to something nicer. |
| */ |
| BUG_ON(ret); |
| return ret; |
| } |
| |
| /* |
| * Attempt to fix basic block failures. If we can't fix it for whatever reason |
| * then just return -EIO. |
| */ |
| static int try_to_fix_bad_block(struct btrfs_root *root, |
| struct extent_buffer *buf, |
| enum btrfs_tree_block_status status) |
| { |
| struct btrfs_trans_handle *trans; |
| struct ulist *roots; |
| struct ulist_node *node; |
| struct btrfs_root *search_root; |
| struct btrfs_path path; |
| struct ulist_iterator iter; |
| struct btrfs_key root_key, key; |
| int ret; |
| |
| if (status != BTRFS_TREE_BLOCK_BAD_KEY_ORDER && |
| status != BTRFS_TREE_BLOCK_INVALID_OFFSETS) |
| return -EIO; |
| |
| ret = btrfs_find_all_roots(NULL, root->fs_info, buf->start, 0, &roots); |
| if (ret) |
| return -EIO; |
| |
| btrfs_init_path(&path); |
| ULIST_ITER_INIT(&iter); |
| while ((node = ulist_next(roots, &iter))) { |
| root_key.objectid = node->val; |
| root_key.type = BTRFS_ROOT_ITEM_KEY; |
| root_key.offset = (u64)-1; |
| |
| search_root = btrfs_read_fs_root(root->fs_info, &root_key); |
| if (IS_ERR(root)) { |
| ret = -EIO; |
| break; |
| } |
| |
| |
| trans = btrfs_start_transaction(search_root, 0); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| break; |
| } |
| |
| path.lowest_level = btrfs_header_level(buf); |
| path.skip_check_block = 1; |
| if (path.lowest_level) |
| btrfs_node_key_to_cpu(buf, &key, 0); |
| else |
| btrfs_item_key_to_cpu(buf, &key, 0); |
| ret = btrfs_search_slot(trans, search_root, &key, &path, 0, 1); |
| if (ret) { |
| ret = -EIO; |
| btrfs_commit_transaction(trans, search_root); |
| break; |
| } |
| if (status == BTRFS_TREE_BLOCK_BAD_KEY_ORDER) |
| ret = fix_key_order(search_root, &path); |
| else if (status == BTRFS_TREE_BLOCK_INVALID_OFFSETS) |
| ret = fix_item_offset(search_root, &path); |
| if (ret) { |
| btrfs_commit_transaction(trans, search_root); |
| break; |
| } |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, search_root); |
| } |
| ulist_free(roots); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int check_block(struct btrfs_root *root, |
| struct cache_tree *extent_cache, |
| struct extent_buffer *buf, u64 flags) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| struct btrfs_key key; |
| enum btrfs_tree_block_status status; |
| int ret = 0; |
| int level; |
| |
| cache = lookup_cache_extent(extent_cache, buf->start, buf->len); |
| if (!cache) |
| return 1; |
| rec = container_of(cache, struct extent_record, cache); |
| rec->generation = btrfs_header_generation(buf); |
| |
| level = btrfs_header_level(buf); |
| if (btrfs_header_nritems(buf) > 0) { |
| |
| if (level == 0) |
| btrfs_item_key_to_cpu(buf, &key, 0); |
| else |
| btrfs_node_key_to_cpu(buf, &key, 0); |
| |
| rec->info_objectid = key.objectid; |
| } |
| rec->info_level = level; |
| |
| if (btrfs_is_leaf(buf)) |
| status = btrfs_check_leaf(root, &rec->parent_key, buf); |
| else |
| status = btrfs_check_node(root, &rec->parent_key, buf); |
| |
| if (status != BTRFS_TREE_BLOCK_CLEAN) { |
| if (repair) |
| status = try_to_fix_bad_block(root, buf, status); |
| if (status != BTRFS_TREE_BLOCK_CLEAN) { |
| ret = -EIO; |
| fprintf(stderr, "bad block %llu\n", |
| (unsigned long long)buf->start); |
| } else { |
| /* |
| * Signal to callers we need to start the scan over |
| * again since we'll have cowed blocks. |
| */ |
| ret = -EAGAIN; |
| } |
| } else { |
| rec->content_checked = 1; |
| if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) |
| rec->owner_ref_checked = 1; |
| else { |
| ret = check_owner_ref(root, rec, buf); |
| if (!ret) |
| rec->owner_ref_checked = 1; |
| } |
| } |
| if (!ret) |
| maybe_free_extent_rec(extent_cache, rec); |
| return ret; |
| } |
| |
| static struct tree_backref *find_tree_backref(struct extent_record *rec, |
| u64 parent, u64 root) |
| { |
| struct list_head *cur = rec->backrefs.next; |
| struct extent_backref *node; |
| struct tree_backref *back; |
| |
| while(cur != &rec->backrefs) { |
| node = to_extent_backref(cur); |
| cur = cur->next; |
| if (node->is_data) |
| continue; |
| back = to_tree_backref(node); |
| if (parent > 0) { |
| if (!node->full_backref) |
| continue; |
| if (parent == back->parent) |
| return back; |
| } else { |
| if (node->full_backref) |
| continue; |
| if (back->root == root) |
| return back; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct tree_backref *alloc_tree_backref(struct extent_record *rec, |
| u64 parent, u64 root) |
| { |
| struct tree_backref *ref = malloc(sizeof(*ref)); |
| |
| if (!ref) |
| return NULL; |
| memset(&ref->node, 0, sizeof(ref->node)); |
| if (parent > 0) { |
| ref->parent = parent; |
| ref->node.full_backref = 1; |
| } else { |
| ref->root = root; |
| ref->node.full_backref = 0; |
| } |
| list_add_tail(&ref->node.list, &rec->backrefs); |
| |
| return ref; |
| } |
| |
| static struct data_backref *find_data_backref(struct extent_record *rec, |
| u64 parent, u64 root, |
| u64 owner, u64 offset, |
| int found_ref, |
| u64 disk_bytenr, u64 bytes) |
| { |
| struct list_head *cur = rec->backrefs.next; |
| struct extent_backref *node; |
| struct data_backref *back; |
| |
| while(cur != &rec->backrefs) { |
| node = to_extent_backref(cur); |
| cur = cur->next; |
| if (!node->is_data) |
| continue; |
| back = to_data_backref(node); |
| if (parent > 0) { |
| if (!node->full_backref) |
| continue; |
| if (parent == back->parent) |
| return back; |
| } else { |
| if (node->full_backref) |
| continue; |
| if (back->root == root && back->owner == owner && |
| back->offset == offset) { |
| if (found_ref && node->found_ref && |
| (back->bytes != bytes || |
| back->disk_bytenr != disk_bytenr)) |
| continue; |
| return back; |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| static struct data_backref *alloc_data_backref(struct extent_record *rec, |
| u64 parent, u64 root, |
| u64 owner, u64 offset, |
| u64 max_size) |
| { |
| struct data_backref *ref = malloc(sizeof(*ref)); |
| |
| if (!ref) |
| return NULL; |
| memset(&ref->node, 0, sizeof(ref->node)); |
| ref->node.is_data = 1; |
| |
| if (parent > 0) { |
| ref->parent = parent; |
| ref->owner = 0; |
| ref->offset = 0; |
| ref->node.full_backref = 1; |
| } else { |
| ref->root = root; |
| ref->owner = owner; |
| ref->offset = offset; |
| ref->node.full_backref = 0; |
| } |
| ref->bytes = max_size; |
| ref->found_ref = 0; |
| ref->num_refs = 0; |
| list_add_tail(&ref->node.list, &rec->backrefs); |
| if (max_size > rec->max_size) |
| rec->max_size = max_size; |
| return ref; |
| } |
| |
| /* Check if the type of extent matches with its chunk */ |
| static void check_extent_type(struct extent_record *rec) |
| { |
| struct btrfs_block_group_cache *bg_cache; |
| |
| bg_cache = btrfs_lookup_first_block_group(global_info, rec->start); |
| if (!bg_cache) |
| return; |
| |
| /* data extent, check chunk directly*/ |
| if (!rec->metadata) { |
| if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_DATA)) |
| rec->wrong_chunk_type = 1; |
| return; |
| } |
| |
| /* metadata extent, check the obvious case first */ |
| if (!(bg_cache->flags & (BTRFS_BLOCK_GROUP_SYSTEM | |
| BTRFS_BLOCK_GROUP_METADATA))) { |
| rec->wrong_chunk_type = 1; |
| return; |
| } |
| |
| /* |
| * Check SYSTEM extent, as it's also marked as metadata, we can only |
| * make sure it's a SYSTEM extent by its backref |
| */ |
| if (!list_empty(&rec->backrefs)) { |
| struct extent_backref *node; |
| struct tree_backref *tback; |
| u64 bg_type; |
| |
| node = to_extent_backref(rec->backrefs.next); |
| if (node->is_data) { |
| /* tree block shouldn't have data backref */ |
| rec->wrong_chunk_type = 1; |
| return; |
| } |
| tback = container_of(node, struct tree_backref, node); |
| |
| if (tback->root == BTRFS_CHUNK_TREE_OBJECTID) |
| bg_type = BTRFS_BLOCK_GROUP_SYSTEM; |
| else |
| bg_type = BTRFS_BLOCK_GROUP_METADATA; |
| if (!(bg_cache->flags & bg_type)) |
| rec->wrong_chunk_type = 1; |
| } |
| } |
| |
| /* |
| * Allocate a new extent record, fill default values from @tmpl and insert int |
| * @extent_cache. Caller is supposed to make sure the [start,nr) is not in |
| * the cache, otherwise it fails. |
| */ |
| static int add_extent_rec_nolookup(struct cache_tree *extent_cache, |
| struct extent_record *tmpl) |
| { |
| struct extent_record *rec; |
| int ret = 0; |
| |
| BUG_ON(tmpl->max_size == 0); |
| rec = malloc(sizeof(*rec)); |
| if (!rec) |
| return -ENOMEM; |
| rec->start = tmpl->start; |
| rec->max_size = tmpl->max_size; |
| rec->nr = max(tmpl->nr, tmpl->max_size); |
| rec->found_rec = tmpl->found_rec; |
| rec->content_checked = tmpl->content_checked; |
| rec->owner_ref_checked = tmpl->owner_ref_checked; |
| rec->num_duplicates = 0; |
| rec->metadata = tmpl->metadata; |
| rec->flag_block_full_backref = FLAG_UNSET; |
| rec->bad_full_backref = 0; |
| rec->crossing_stripes = 0; |
| rec->wrong_chunk_type = 0; |
| rec->is_root = tmpl->is_root; |
| rec->refs = tmpl->refs; |
| rec->extent_item_refs = tmpl->extent_item_refs; |
| rec->parent_generation = tmpl->parent_generation; |
| INIT_LIST_HEAD(&rec->backrefs); |
| INIT_LIST_HEAD(&rec->dups); |
| INIT_LIST_HEAD(&rec->list); |
| memcpy(&rec->parent_key, &tmpl->parent_key, sizeof(tmpl->parent_key)); |
| rec->cache.start = tmpl->start; |
| rec->cache.size = tmpl->nr; |
| ret = insert_cache_extent(extent_cache, &rec->cache); |
| if (ret) { |
| free(rec); |
| return ret; |
| } |
| bytes_used += rec->nr; |
| |
| if (tmpl->metadata) |
| rec->crossing_stripes = check_crossing_stripes(global_info, |
| rec->start, global_info->tree_root->nodesize); |
| check_extent_type(rec); |
| return ret; |
| } |
| |
| /* |
| * Lookup and modify an extent, some values of @tmpl are interpreted verbatim, |
| * some are hints: |
| * - refs - if found, increase refs |
| * - is_root - if found, set |
| * - content_checked - if found, set |
| * - owner_ref_checked - if found, set |
| * |
| * If not found, create a new one, initialize and insert. |
| */ |
| static int add_extent_rec(struct cache_tree *extent_cache, |
| struct extent_record *tmpl) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| int ret = 0; |
| int dup = 0; |
| |
| cache = lookup_cache_extent(extent_cache, tmpl->start, tmpl->nr); |
| if (cache) { |
| rec = container_of(cache, struct extent_record, cache); |
| if (tmpl->refs) |
| rec->refs++; |
| if (rec->nr == 1) |
| rec->nr = max(tmpl->nr, tmpl->max_size); |
| |
| /* |
| * We need to make sure to reset nr to whatever the extent |
| * record says was the real size, this way we can compare it to |
| * the backrefs. |
| */ |
| if (tmpl->found_rec) { |
| if (tmpl->start != rec->start || rec->found_rec) { |
| struct extent_record *tmp; |
| |
| dup = 1; |
| if (list_empty(&rec->list)) |
| list_add_tail(&rec->list, |
| &duplicate_extents); |
| |
| /* |
| * We have to do this song and dance in case we |
| * find an extent record that falls inside of |
| * our current extent record but does not have |
| * the same objectid. |
| */ |
| tmp = malloc(sizeof(*tmp)); |
| if (!tmp) |
| return -ENOMEM; |
| tmp->start = tmpl->start; |
| tmp->max_size = tmpl->max_size; |
| tmp->nr = tmpl->nr; |
| tmp->found_rec = 1; |
| tmp->metadata = tmpl->metadata; |
| tmp->extent_item_refs = tmpl->extent_item_refs; |
| INIT_LIST_HEAD(&tmp->list); |
| list_add_tail(&tmp->list, &rec->dups); |
| rec->num_duplicates++; |
| } else { |
| rec->nr = tmpl->nr; |
| rec->found_rec = 1; |
| } |
| } |
| |
| if (tmpl->extent_item_refs && !dup) { |
| if (rec->extent_item_refs) { |
| fprintf(stderr, "block %llu rec " |
| "extent_item_refs %llu, passed %llu\n", |
| (unsigned long long)tmpl->start, |
| (unsigned long long) |
| rec->extent_item_refs, |
| (unsigned long long)tmpl->extent_item_refs); |
| } |
| rec->extent_item_refs = tmpl->extent_item_refs; |
| } |
| if (tmpl->is_root) |
| rec->is_root = 1; |
| if (tmpl->content_checked) |
| rec->content_checked = 1; |
| if (tmpl->owner_ref_checked) |
| rec->owner_ref_checked = 1; |
| memcpy(&rec->parent_key, &tmpl->parent_key, |
| sizeof(tmpl->parent_key)); |
| if (tmpl->parent_generation) |
| rec->parent_generation = tmpl->parent_generation; |
| if (rec->max_size < tmpl->max_size) |
| rec->max_size = tmpl->max_size; |
| |
| /* |
| * A metadata extent can't cross stripe_len boundary, otherwise |
| * kernel scrub won't be able to handle it. |
| * As now stripe_len is fixed to BTRFS_STRIPE_LEN, just check |
| * it. |
| */ |
| if (tmpl->metadata) |
| rec->crossing_stripes = check_crossing_stripes( |
| global_info, rec->start, |
| global_info->tree_root->nodesize); |
| check_extent_type(rec); |
| maybe_free_extent_rec(extent_cache, rec); |
| return ret; |
| } |
| |
| ret = add_extent_rec_nolookup(extent_cache, tmpl); |
| |
| return ret; |
| } |
| |
| static int add_tree_backref(struct cache_tree *extent_cache, u64 bytenr, |
| u64 parent, u64 root, int found_ref) |
| { |
| struct extent_record *rec; |
| struct tree_backref *back; |
| struct cache_extent *cache; |
| int ret; |
| |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) { |
| struct extent_record tmpl; |
| |
| memset(&tmpl, 0, sizeof(tmpl)); |
| tmpl.start = bytenr; |
| tmpl.nr = 1; |
| tmpl.metadata = 1; |
| tmpl.max_size = 1; |
| |
| ret = add_extent_rec_nolookup(extent_cache, &tmpl); |
| if (ret) |
| return ret; |
| |
| /* really a bug in cache_extent implement now */ |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) |
| return -ENOENT; |
| } |
| |
| rec = container_of(cache, struct extent_record, cache); |
| if (rec->start != bytenr) { |
| /* |
| * Several cause, from unaligned bytenr to over lapping extents |
| */ |
| return -EEXIST; |
| } |
| |
| back = find_tree_backref(rec, parent, root); |
| if (!back) { |
| back = alloc_tree_backref(rec, parent, root); |
| if (!back) |
| return -ENOMEM; |
| } |
| |
| if (found_ref) { |
| if (back->node.found_ref) { |
| fprintf(stderr, "Extent back ref already exists " |
| "for %llu parent %llu root %llu \n", |
| (unsigned long long)bytenr, |
| (unsigned long long)parent, |
| (unsigned long long)root); |
| } |
| back->node.found_ref = 1; |
| } else { |
| if (back->node.found_extent_tree) { |
| fprintf(stderr, "Extent back ref already exists " |
| "for %llu parent %llu root %llu \n", |
| (unsigned long long)bytenr, |
| (unsigned long long)parent, |
| (unsigned long long)root); |
| } |
| back->node.found_extent_tree = 1; |
| } |
| check_extent_type(rec); |
| maybe_free_extent_rec(extent_cache, rec); |
| return 0; |
| } |
| |
| static int add_data_backref(struct cache_tree *extent_cache, u64 bytenr, |
| u64 parent, u64 root, u64 owner, u64 offset, |
| u32 num_refs, int found_ref, u64 max_size) |
| { |
| struct extent_record *rec; |
| struct data_backref *back; |
| struct cache_extent *cache; |
| int ret; |
| |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) { |
| struct extent_record tmpl; |
| |
| memset(&tmpl, 0, sizeof(tmpl)); |
| tmpl.start = bytenr; |
| tmpl.nr = 1; |
| tmpl.max_size = max_size; |
| |
| ret = add_extent_rec_nolookup(extent_cache, &tmpl); |
| if (ret) |
| return ret; |
| |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) |
| abort(); |
| } |
| |
| rec = container_of(cache, struct extent_record, cache); |
| if (rec->max_size < max_size) |
| rec->max_size = max_size; |
| |
| /* |
| * If found_ref is set then max_size is the real size and must match the |
| * existing refs. So if we have already found a ref then we need to |
| * make sure that this ref matches the existing one, otherwise we need |
| * to add a new backref so we can notice that the backrefs don't match |
| * and we need to figure out who is telling the truth. This is to |
| * account for that awful fsync bug I introduced where we'd end up with |
| * a btrfs_file_extent_item that would have its length include multiple |
| * prealloc extents or point inside of a prealloc extent. |
| */ |
| back = find_data_backref(rec, parent, root, owner, offset, found_ref, |
| bytenr, max_size); |
| if (!back) { |
| back = alloc_data_backref(rec, parent, root, owner, offset, |
| max_size); |
| BUG_ON(!back); |
| } |
| |
| if (found_ref) { |
| BUG_ON(num_refs != 1); |
| if (back->node.found_ref) |
| BUG_ON(back->bytes != max_size); |
| back->node.found_ref = 1; |
| back->found_ref += 1; |
| back->bytes = max_size; |
| back->disk_bytenr = bytenr; |
| rec->refs += 1; |
| rec->content_checked = 1; |
| rec->owner_ref_checked = 1; |
| } else { |
| if (back->node.found_extent_tree) { |
| fprintf(stderr, "Extent back ref already exists " |
| "for %llu parent %llu root %llu " |
| "owner %llu offset %llu num_refs %lu\n", |
| (unsigned long long)bytenr, |
| (unsigned long long)parent, |
| (unsigned long long)root, |
| (unsigned long long)owner, |
| (unsigned long long)offset, |
| (unsigned long)num_refs); |
| } |
| back->num_refs = num_refs; |
| back->node.found_extent_tree = 1; |
| } |
| maybe_free_extent_rec(extent_cache, rec); |
| return 0; |
| } |
| |
| static int add_pending(struct cache_tree *pending, |
| struct cache_tree *seen, u64 bytenr, u32 size) |
| { |
| int ret; |
| ret = add_cache_extent(seen, bytenr, size); |
| if (ret) |
| return ret; |
| add_cache_extent(pending, bytenr, size); |
| return 0; |
| } |
| |
| static int pick_next_pending(struct cache_tree *pending, |
| struct cache_tree *reada, |
| struct cache_tree *nodes, |
| u64 last, struct block_info *bits, int bits_nr, |
| int *reada_bits) |
| { |
| unsigned long node_start = last; |
| struct cache_extent *cache; |
| int ret; |
| |
| cache = search_cache_extent(reada, 0); |
| if (cache) { |
| bits[0].start = cache->start; |
| bits[0].size = cache->size; |
| *reada_bits = 1; |
| return 1; |
| } |
| *reada_bits = 0; |
| if (node_start > 32768) |
| node_start -= 32768; |
| |
| cache = search_cache_extent(nodes, node_start); |
| if (!cache) |
| cache = search_cache_extent(nodes, 0); |
| |
| if (!cache) { |
| cache = search_cache_extent(pending, 0); |
| if (!cache) |
| return 0; |
| ret = 0; |
| do { |
| bits[ret].start = cache->start; |
| bits[ret].size = cache->size; |
| cache = next_cache_extent(cache); |
| ret++; |
| } while (cache && ret < bits_nr); |
| return ret; |
| } |
| |
| ret = 0; |
| do { |
| bits[ret].start = cache->start; |
| bits[ret].size = cache->size; |
| cache = next_cache_extent(cache); |
| ret++; |
| } while (cache && ret < bits_nr); |
| |
| if (bits_nr - ret > 8) { |
| u64 lookup = bits[0].start + bits[0].size; |
| struct cache_extent *next; |
| next = search_cache_extent(pending, lookup); |
| while(next) { |
| if (next->start - lookup > 32768) |
| break; |
| bits[ret].start = next->start; |
| bits[ret].size = next->size; |
| lookup = next->start + next->size; |
| ret++; |
| if (ret == bits_nr) |
| break; |
| next = next_cache_extent(next); |
| if (!next) |
| break; |
| } |
| } |
| return ret; |
| } |
| |
| static void free_chunk_record(struct cache_extent *cache) |
| { |
| struct chunk_record *rec; |
| |
| rec = container_of(cache, struct chunk_record, cache); |
| list_del_init(&rec->list); |
| list_del_init(&rec->dextents); |
| free(rec); |
| } |
| |
| void free_chunk_cache_tree(struct cache_tree *chunk_cache) |
| { |
| cache_tree_free_extents(chunk_cache, free_chunk_record); |
| } |
| |
| static void free_device_record(struct rb_node *node) |
| { |
| struct device_record *rec; |
| |
| rec = container_of(node, struct device_record, node); |
| free(rec); |
| } |
| |
| FREE_RB_BASED_TREE(device_cache, free_device_record); |
| |
| int insert_block_group_record(struct block_group_tree *tree, |
| struct block_group_record *bg_rec) |
| { |
| int ret; |
| |
| ret = insert_cache_extent(&tree->tree, &bg_rec->cache); |
| if (ret) |
| return ret; |
| |
| list_add_tail(&bg_rec->list, &tree->block_groups); |
| return 0; |
| } |
| |
| static void free_block_group_record(struct cache_extent *cache) |
| { |
| struct block_group_record *rec; |
| |
| rec = container_of(cache, struct block_group_record, cache); |
| list_del_init(&rec->list); |
| free(rec); |
| } |
| |
| void free_block_group_tree(struct block_group_tree *tree) |
| { |
| cache_tree_free_extents(&tree->tree, free_block_group_record); |
| } |
| |
| int insert_device_extent_record(struct device_extent_tree *tree, |
| struct device_extent_record *de_rec) |
| { |
| int ret; |
| |
| /* |
| * Device extent is a bit different from the other extents, because |
| * the extents which belong to the different devices may have the |
| * same start and size, so we need use the special extent cache |
| * search/insert functions. |
| */ |
| ret = insert_cache_extent2(&tree->tree, &de_rec->cache); |
| if (ret) |
| return ret; |
| |
| list_add_tail(&de_rec->chunk_list, &tree->no_chunk_orphans); |
| list_add_tail(&de_rec->device_list, &tree->no_device_orphans); |
| return 0; |
| } |
| |
| static void free_device_extent_record(struct cache_extent *cache) |
| { |
| struct device_extent_record *rec; |
| |
| rec = container_of(cache, struct device_extent_record, cache); |
| if (!list_empty(&rec->chunk_list)) |
| list_del_init(&rec->chunk_list); |
| if (!list_empty(&rec->device_list)) |
| list_del_init(&rec->device_list); |
| free(rec); |
| } |
| |
| void free_device_extent_tree(struct device_extent_tree *tree) |
| { |
| cache_tree_free_extents(&tree->tree, free_device_extent_record); |
| } |
| |
| #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| static int process_extent_ref_v0(struct cache_tree *extent_cache, |
| struct extent_buffer *leaf, int slot) |
| { |
| struct btrfs_extent_ref_v0 *ref0; |
| struct btrfs_key key; |
| int ret; |
| |
| btrfs_item_key_to_cpu(leaf, &key, slot); |
| ref0 = btrfs_item_ptr(leaf, slot, struct btrfs_extent_ref_v0); |
| if (btrfs_ref_objectid_v0(leaf, ref0) < BTRFS_FIRST_FREE_OBJECTID) { |
| ret = add_tree_backref(extent_cache, key.objectid, key.offset, |
| 0, 0); |
| } else { |
| ret = add_data_backref(extent_cache, key.objectid, key.offset, |
| 0, 0, 0, btrfs_ref_count_v0(leaf, ref0), 0, 0); |
| } |
| return ret; |
| } |
| #endif |
| |
| struct chunk_record *btrfs_new_chunk_record(struct extent_buffer *leaf, |
| struct btrfs_key *key, |
| int slot) |
| { |
| struct btrfs_chunk *ptr; |
| struct chunk_record *rec; |
| int num_stripes, i; |
| |
| ptr = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); |
| num_stripes = btrfs_chunk_num_stripes(leaf, ptr); |
| |
| rec = calloc(1, btrfs_chunk_record_size(num_stripes)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| |
| INIT_LIST_HEAD(&rec->list); |
| INIT_LIST_HEAD(&rec->dextents); |
| rec->bg_rec = NULL; |
| |
| rec->cache.start = key->offset; |
| rec->cache.size = btrfs_chunk_length(leaf, ptr); |
| |
| rec->generation = btrfs_header_generation(leaf); |
| |
| rec->objectid = key->objectid; |
| rec->type = key->type; |
| rec->offset = key->offset; |
| |
| rec->length = rec->cache.size; |
| rec->owner = btrfs_chunk_owner(leaf, ptr); |
| rec->stripe_len = btrfs_chunk_stripe_len(leaf, ptr); |
| rec->type_flags = btrfs_chunk_type(leaf, ptr); |
| rec->io_width = btrfs_chunk_io_width(leaf, ptr); |
| rec->io_align = btrfs_chunk_io_align(leaf, ptr); |
| rec->sector_size = btrfs_chunk_sector_size(leaf, ptr); |
| rec->num_stripes = num_stripes; |
| rec->sub_stripes = btrfs_chunk_sub_stripes(leaf, ptr); |
| |
| for (i = 0; i < rec->num_stripes; ++i) { |
| rec->stripes[i].devid = |
| btrfs_stripe_devid_nr(leaf, ptr, i); |
| rec->stripes[i].offset = |
| btrfs_stripe_offset_nr(leaf, ptr, i); |
| read_extent_buffer(leaf, rec->stripes[i].dev_uuid, |
| (unsigned long)btrfs_stripe_dev_uuid_nr(ptr, i), |
| BTRFS_UUID_SIZE); |
| } |
| |
| return rec; |
| } |
| |
| static int process_chunk_item(struct cache_tree *chunk_cache, |
| struct btrfs_key *key, struct extent_buffer *eb, |
| int slot) |
| { |
| struct chunk_record *rec; |
| struct btrfs_chunk *chunk; |
| int ret = 0; |
| |
| chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk); |
| /* |
| * Do extra check for this chunk item, |
| * |
| * It's still possible one can craft a leaf with CHUNK_ITEM, with |
| * wrong onwer(3) out of chunk tree, to pass both chunk tree check |
| * and owner<->key_type check. |
| */ |
| ret = btrfs_check_chunk_valid(global_info->tree_root, eb, chunk, slot, |
| key->offset); |
| if (ret < 0) { |
| error("chunk(%llu, %llu) is not valid, ignore it", |
| key->offset, btrfs_chunk_length(eb, chunk)); |
| return 0; |
| } |
| rec = btrfs_new_chunk_record(eb, key, slot); |
| ret = insert_cache_extent(chunk_cache, &rec->cache); |
| if (ret) { |
| fprintf(stderr, "Chunk[%llu, %llu] existed.\n", |
| rec->offset, rec->length); |
| free(rec); |
| } |
| |
| return ret; |
| } |
| |
| static int process_device_item(struct rb_root *dev_cache, |
| struct btrfs_key *key, struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_dev_item *ptr; |
| struct device_record *rec; |
| int ret = 0; |
| |
| ptr = btrfs_item_ptr(eb, |
| slot, struct btrfs_dev_item); |
| |
| rec = malloc(sizeof(*rec)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| return -ENOMEM; |
| } |
| |
| rec->devid = key->offset; |
| rec->generation = btrfs_header_generation(eb); |
| |
| rec->objectid = key->objectid; |
| rec->type = key->type; |
| rec->offset = key->offset; |
| |
| rec->devid = btrfs_device_id(eb, ptr); |
| rec->total_byte = btrfs_device_total_bytes(eb, ptr); |
| rec->byte_used = btrfs_device_bytes_used(eb, ptr); |
| |
| ret = rb_insert(dev_cache, &rec->node, device_record_compare); |
| if (ret) { |
| fprintf(stderr, "Device[%llu] existed.\n", rec->devid); |
| free(rec); |
| } |
| |
| return ret; |
| } |
| |
| struct block_group_record * |
| btrfs_new_block_group_record(struct extent_buffer *leaf, struct btrfs_key *key, |
| int slot) |
| { |
| struct btrfs_block_group_item *ptr; |
| struct block_group_record *rec; |
| |
| rec = calloc(1, sizeof(*rec)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| |
| rec->cache.start = key->objectid; |
| rec->cache.size = key->offset; |
| |
| rec->generation = btrfs_header_generation(leaf); |
| |
| rec->objectid = key->objectid; |
| rec->type = key->type; |
| rec->offset = key->offset; |
| |
| ptr = btrfs_item_ptr(leaf, slot, struct btrfs_block_group_item); |
| rec->flags = btrfs_disk_block_group_flags(leaf, ptr); |
| |
| INIT_LIST_HEAD(&rec->list); |
| |
| return rec; |
| } |
| |
| static int process_block_group_item(struct block_group_tree *block_group_cache, |
| struct btrfs_key *key, |
| struct extent_buffer *eb, int slot) |
| { |
| struct block_group_record *rec; |
| int ret = 0; |
| |
| rec = btrfs_new_block_group_record(eb, key, slot); |
| ret = insert_block_group_record(block_group_cache, rec); |
| if (ret) { |
| fprintf(stderr, "Block Group[%llu, %llu] existed.\n", |
| rec->objectid, rec->offset); |
| free(rec); |
| } |
| |
| return ret; |
| } |
| |
| struct device_extent_record * |
| btrfs_new_device_extent_record(struct extent_buffer *leaf, |
| struct btrfs_key *key, int slot) |
| { |
| struct device_extent_record *rec; |
| struct btrfs_dev_extent *ptr; |
| |
| rec = calloc(1, sizeof(*rec)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| |
| rec->cache.objectid = key->objectid; |
| rec->cache.start = key->offset; |
| |
| rec->generation = btrfs_header_generation(leaf); |
| |
| rec->objectid = key->objectid; |
| rec->type = key->type; |
| rec->offset = key->offset; |
| |
| ptr = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent); |
| rec->chunk_objecteid = |
| btrfs_dev_extent_chunk_objectid(leaf, ptr); |
| rec->chunk_offset = |
| btrfs_dev_extent_chunk_offset(leaf, ptr); |
| rec->length = btrfs_dev_extent_length(leaf, ptr); |
| rec->cache.size = rec->length; |
| |
| INIT_LIST_HEAD(&rec->chunk_list); |
| INIT_LIST_HEAD(&rec->device_list); |
| |
| return rec; |
| } |
| |
| static int |
| process_device_extent_item(struct device_extent_tree *dev_extent_cache, |
| struct btrfs_key *key, struct extent_buffer *eb, |
| int slot) |
| { |
| struct device_extent_record *rec; |
| int ret; |
| |
| rec = btrfs_new_device_extent_record(eb, key, slot); |
| ret = insert_device_extent_record(dev_extent_cache, rec); |
| if (ret) { |
| fprintf(stderr, |
| "Device extent[%llu, %llu, %llu] existed.\n", |
| rec->objectid, rec->offset, rec->length); |
| free(rec); |
| } |
| |
| return ret; |
| } |
| |
| static int process_extent_item(struct btrfs_root *root, |
| struct cache_tree *extent_cache, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_extent_item *ei; |
| struct btrfs_extent_inline_ref *iref; |
| struct btrfs_extent_data_ref *dref; |
| struct btrfs_shared_data_ref *sref; |
| struct btrfs_key key; |
| struct extent_record tmpl; |
| unsigned long end; |
| unsigned long ptr; |
| int ret; |
| int type; |
| u32 item_size = btrfs_item_size_nr(eb, slot); |
| u64 refs = 0; |
| u64 offset; |
| u64 num_bytes; |
| int metadata = 0; |
| |
| btrfs_item_key_to_cpu(eb, &key, slot); |
| |
| if (key.type == BTRFS_METADATA_ITEM_KEY) { |
| metadata = 1; |
| num_bytes = root->nodesize; |
| } else { |
| num_bytes = key.offset; |
| } |
| |
| if (!IS_ALIGNED(key.objectid, root->sectorsize)) { |
| error("ignoring invalid extent, bytenr %llu is not aligned to %u", |
| key.objectid, root->sectorsize); |
| return -EIO; |
| } |
| if (item_size < sizeof(*ei)) { |
| #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| struct btrfs_extent_item_v0 *ei0; |
| BUG_ON(item_size != sizeof(*ei0)); |
| ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0); |
| refs = btrfs_extent_refs_v0(eb, ei0); |
| #else |
| BUG(); |
| #endif |
| memset(&tmpl, 0, sizeof(tmpl)); |
| tmpl.start = key.objectid; |
| tmpl.nr = num_bytes; |
| tmpl.extent_item_refs = refs; |
| tmpl.metadata = metadata; |
| tmpl.found_rec = 1; |
| tmpl.max_size = num_bytes; |
| |
| return add_extent_rec(extent_cache, &tmpl); |
| } |
| |
| ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); |
| refs = btrfs_extent_refs(eb, ei); |
| if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK) |
| metadata = 1; |
| else |
| metadata = 0; |
| if (metadata && num_bytes != root->nodesize) { |
| error("ignore invalid metadata extent, length %llu does not equal to %u", |
| num_bytes, root->nodesize); |
| return -EIO; |
| } |
| if (!metadata && !IS_ALIGNED(num_bytes, root->sectorsize)) { |
| error("ignore invalid data extent, length %llu is not aligned to %u", |
| num_bytes, root->sectorsize); |
| return -EIO; |
| } |
| |
| memset(&tmpl, 0, sizeof(tmpl)); |
| tmpl.start = key.objectid; |
| tmpl.nr = num_bytes; |
| tmpl.extent_item_refs = refs; |
| tmpl.metadata = metadata; |
| tmpl.found_rec = 1; |
| tmpl.max_size = num_bytes; |
| add_extent_rec(extent_cache, &tmpl); |
| |
| ptr = (unsigned long)(ei + 1); |
| if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK && |
| key.type == BTRFS_EXTENT_ITEM_KEY) |
| ptr += sizeof(struct btrfs_tree_block_info); |
| |
| end = (unsigned long)ei + item_size; |
| while (ptr < end) { |
| iref = (struct btrfs_extent_inline_ref *)ptr; |
| type = btrfs_extent_inline_ref_type(eb, iref); |
| offset = btrfs_extent_inline_ref_offset(eb, iref); |
| switch (type) { |
| case BTRFS_TREE_BLOCK_REF_KEY: |
| ret = add_tree_backref(extent_cache, key.objectid, |
| 0, offset, 0); |
| if (ret < 0) |
| error( |
| "add_tree_backref failed (extent items tree block): %s", |
| strerror(-ret)); |
| break; |
| case BTRFS_SHARED_BLOCK_REF_KEY: |
| ret = add_tree_backref(extent_cache, key.objectid, |
| offset, 0, 0); |
| if (ret < 0) |
| error( |
| "add_tree_backref failed (extent items shared block): %s", |
| strerror(-ret)); |
| break; |
| case BTRFS_EXTENT_DATA_REF_KEY: |
| dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| add_data_backref(extent_cache, key.objectid, 0, |
| btrfs_extent_data_ref_root(eb, dref), |
| btrfs_extent_data_ref_objectid(eb, |
| dref), |
| btrfs_extent_data_ref_offset(eb, dref), |
| btrfs_extent_data_ref_count(eb, dref), |
| 0, num_bytes); |
| break; |
| case BTRFS_SHARED_DATA_REF_KEY: |
| sref = (struct btrfs_shared_data_ref *)(iref + 1); |
| add_data_backref(extent_cache, key.objectid, offset, |
| 0, 0, 0, |
| btrfs_shared_data_ref_count(eb, sref), |
| 0, num_bytes); |
| break; |
| default: |
| fprintf(stderr, "corrupt extent record: key %Lu %u %Lu\n", |
| key.objectid, key.type, num_bytes); |
| goto out; |
| } |
| ptr += btrfs_extent_inline_ref_size(type); |
| } |
| WARN_ON(ptr > end); |
| out: |
| return 0; |
| } |
| |
| static int check_cache_range(struct btrfs_root *root, |
| struct btrfs_block_group_cache *cache, |
| u64 offset, u64 bytes) |
| { |
| struct btrfs_free_space *entry; |
| u64 *logical; |
| u64 bytenr; |
| int stripe_len; |
| int i, nr, ret; |
| |
| for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| bytenr = btrfs_sb_offset(i); |
| ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| cache->key.objectid, bytenr, 0, |
| &logical, &nr, &stripe_len); |
| if (ret) |
| return ret; |
| |
| while (nr--) { |
| if (logical[nr] + stripe_len <= offset) |
| continue; |
| if (offset + bytes <= logical[nr]) |
| continue; |
| if (logical[nr] == offset) { |
| if (stripe_len >= bytes) { |
| free(logical); |
| return 0; |
| } |
| bytes -= stripe_len; |
| offset += stripe_len; |
| } else if (logical[nr] < offset) { |
| if (logical[nr] + stripe_len >= |
| offset + bytes) { |
| free(logical); |
| return 0; |
| } |
| bytes = (offset + bytes) - |
| (logical[nr] + stripe_len); |
| offset = logical[nr] + stripe_len; |
| } else { |
| /* |
| * Could be tricky, the super may land in the |
| * middle of the area we're checking. First |
| * check the easiest case, it's at the end. |
| */ |
| if (logical[nr] + stripe_len >= |
| bytes + offset) { |
| bytes = logical[nr] - offset; |
| continue; |
| } |
| |
| /* Check the left side */ |
| ret = check_cache_range(root, cache, |
| offset, |
| logical[nr] - offset); |
| if (ret) { |
| free(logical); |
| return ret; |
| } |
| |
| /* Now we continue with the right side */ |
| bytes = (offset + bytes) - |
| (logical[nr] + stripe_len); |
| offset = logical[nr] + stripe_len; |
| } |
| } |
| |
| free(logical); |
| } |
| |
| entry = btrfs_find_free_space(cache->free_space_ctl, offset, bytes); |
| if (!entry) { |
| fprintf(stderr, "There is no free space entry for %Lu-%Lu\n", |
| offset, offset+bytes); |
| return -EINVAL; |
| } |
| |
| if (entry->offset != offset) { |
| fprintf(stderr, "Wanted offset %Lu, found %Lu\n", offset, |
| entry->offset); |
| return -EINVAL; |
| } |
| |
| if (entry->bytes != bytes) { |
| fprintf(stderr, "Wanted bytes %Lu, found %Lu for off %Lu\n", |
| bytes, entry->bytes, offset); |
| return -EINVAL; |
| } |
| |
| unlink_free_space(cache->free_space_ctl, entry); |
| free(entry); |
| return 0; |
| } |
| |
| static int verify_space_cache(struct btrfs_root *root, |
| struct btrfs_block_group_cache *cache) |
| { |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| u64 last; |
| int ret = 0; |
| |
| root = root->fs_info->extent_root; |
| |
| last = max_t(u64, cache->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
| |
| btrfs_init_path(&path); |
| key.objectid = last; |
| key.offset = 0; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| ret = 0; |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(root, &path); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = 0; |
| break; |
| } |
| } |
| leaf = path.nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.objectid >= cache->key.offset + cache->key.objectid) |
| break; |
| if (key.type != BTRFS_EXTENT_ITEM_KEY && |
| key.type != BTRFS_METADATA_ITEM_KEY) { |
| path.slots[0]++; |
| continue; |
| } |
| |
| if (last == key.objectid) { |
| if (key.type == BTRFS_EXTENT_ITEM_KEY) |
| last = key.objectid + key.offset; |
| else |
| last = key.objectid + root->nodesize; |
| path.slots[0]++; |
| continue; |
| } |
| |
| ret = check_cache_range(root, cache, last, |
| key.objectid - last); |
| if (ret) |
| break; |
| if (key.type == BTRFS_EXTENT_ITEM_KEY) |
| last = key.objectid + key.offset; |
| else |
| last = key.objectid + root->nodesize; |
| path.slots[0]++; |
| } |
| |
| if (last < cache->key.objectid + cache->key.offset) |
| ret = check_cache_range(root, cache, last, |
| cache->key.objectid + |
| cache->key.offset - last); |
| |
| out: |
| btrfs_release_path(&path); |
| |
| if (!ret && |
| !RB_EMPTY_ROOT(&cache->free_space_ctl->free_space_offset)) { |
| fprintf(stderr, "There are still entries left in the space " |
| "cache\n"); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int check_space_cache(struct btrfs_root *root) |
| { |
| struct btrfs_block_group_cache *cache; |
| u64 start = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE; |
| int ret; |
| int error = 0; |
| |
| if (btrfs_super_cache_generation(root->fs_info->super_copy) != -1ULL && |
| btrfs_super_generation(root->fs_info->super_copy) != |
| btrfs_super_cache_generation(root->fs_info->super_copy)) { |
| printf("cache and super generation don't match, space cache " |
| "will be invalidated\n"); |
| return 0; |
| } |
| |
| if (ctx.progress_enabled) { |
| ctx.tp = TASK_FREE_SPACE; |
| task_start(ctx.info); |
| } |
| |
| while (1) { |
| cache = btrfs_lookup_first_block_group(root->fs_info, start); |
| if (!cache) |
| break; |
| |
| start = cache->key.objectid + cache->key.offset; |
| if (!cache->free_space_ctl) { |
| if (btrfs_init_free_space_ctl(cache, |
| root->sectorsize)) { |
| ret = -ENOMEM; |
| break; |
| } |
| } else { |
| btrfs_remove_free_space_cache(cache); |
| } |
| |
| if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) { |
| ret = exclude_super_stripes(root, cache); |
| if (ret) { |
| fprintf(stderr, "could not exclude super stripes: %s\n", |
| strerror(-ret)); |
| error++; |
| continue; |
| } |
| ret = load_free_space_tree(root->fs_info, cache); |
| free_excluded_extents(root, cache); |
| if (ret < 0) { |
| fprintf(stderr, "could not load free space tree: %s\n", |
| strerror(-ret)); |
| error++; |
| continue; |
| } |
| error += ret; |
| } else { |
| ret = load_free_space_cache(root->fs_info, cache); |
| if (!ret) |
| continue; |
| } |
| |
| ret = verify_space_cache(root, cache); |
| if (ret) { |
| fprintf(stderr, "cache appears valid but isn't %Lu\n", |
| cache->key.objectid); |
| error++; |
| } |
| } |
| |
| task_stop(ctx.info); |
| |
| return error ? -EINVAL : 0; |
| } |
| |
| static int check_extent_csums(struct btrfs_root *root, u64 bytenr, |
| u64 num_bytes, unsigned long leaf_offset, |
| struct extent_buffer *eb) { |
| |
| u64 offset = 0; |
| u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
| char *data; |
| unsigned long csum_offset; |
| u32 csum; |
| u32 csum_expected; |
| u64 read_len; |
| u64 data_checked = 0; |
| u64 tmp; |
| int ret = 0; |
| int mirror; |
| int num_copies; |
| |
| if (num_bytes % root->sectorsize) |
| return -EINVAL; |
| |
| data = malloc(num_bytes); |
| if (!data) |
| return -ENOMEM; |
| |
| while (offset < num_bytes) { |
| mirror = 0; |
| again: |
| read_len = num_bytes - offset; |
| /* read as much space once a time */ |
| ret = read_extent_data(root, data + offset, |
| bytenr + offset, &read_len, mirror); |
| if (ret) |
| goto out; |
| data_checked = 0; |
| /* verify every 4k data's checksum */ |
| while (data_checked < read_len) { |
| csum = ~(u32)0; |
| tmp = offset + data_checked; |
| |
| csum = btrfs_csum_data((char *)data + tmp, |
| csum, root->sectorsize); |
| btrfs_csum_final(csum, (u8 *)&csum); |
| |
| csum_offset = leaf_offset + |
| tmp / root->sectorsize * csum_size; |
| read_extent_buffer(eb, (char *)&csum_expected, |
| csum_offset, csum_size); |
| /* try another mirror */ |
| if (csum != csum_expected) { |
| fprintf(stderr, "mirror %d bytenr %llu csum %u expected csum %u\n", |
| mirror, bytenr + tmp, |
| csum, csum_expected); |
| num_copies = btrfs_num_copies( |
| &root->fs_info->mapping_tree, |
| bytenr, num_bytes); |
| if (mirror < num_copies - 1) { |
| mirror += 1; |
| goto again; |
| } |
| } |
| data_checked += root->sectorsize; |
| } |
| offset += read_len; |
| } |
| out: |
| free(data); |
| return ret; |
| } |
| |
| static int check_extent_exists(struct btrfs_root *root, u64 bytenr, |
| u64 num_bytes) |
| { |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| int ret; |
| |
| btrfs_init_path(&path); |
| key.objectid = bytenr; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| again: |
| ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, &path, |
| 0, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error looking up extent record %d\n", ret); |
| btrfs_release_path(&path); |
| return ret; |
| } else if (ret) { |
| if (path.slots[0] > 0) { |
| path.slots[0]--; |
| } else { |
| ret = btrfs_prev_leaf(root, &path); |
| if (ret < 0) { |
| goto out; |
| } else if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| } |
| } |
| |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| |
| /* |
| * Block group items come before extent items if they have the same |
| * bytenr, so walk back one more just in case. Dear future traveller, |
| * first congrats on mastering time travel. Now if it's not too much |
| * trouble could you go back to 2006 and tell Chris to make the |
| * BLOCK_GROUP_ITEM_KEY (and BTRFS_*_REF_KEY) lower than the |
| * EXTENT_ITEM_KEY please? |
| */ |
| while (key.type > BTRFS_EXTENT_ITEM_KEY) { |
| if (path.slots[0] > 0) { |
| path.slots[0]--; |
| } else { |
| ret = btrfs_prev_leaf(root, &path); |
| if (ret < 0) { |
| goto out; |
| } else if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| } |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| } |
| |
| while (num_bytes) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(root, &path); |
| if (ret < 0) { |
| fprintf(stderr, "Error going to next leaf " |
| "%d\n", ret); |
| btrfs_release_path(&path); |
| return ret; |
| } else if (ret) { |
| break; |
| } |
| } |
| leaf = path.nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.type != BTRFS_EXTENT_ITEM_KEY) { |
| path.slots[0]++; |
| continue; |
| } |
| if (key.objectid + key.offset < bytenr) { |
| path.slots[0]++; |
| continue; |
| } |
| if (key.objectid > bytenr + num_bytes) |
| break; |
| |
| if (key.objectid == bytenr) { |
| if (key.offset >= num_bytes) { |
| num_bytes = 0; |
| break; |
| } |
| num_bytes -= key.offset; |
| bytenr += key.offset; |
| } else if (key.objectid < bytenr) { |
| if (key.objectid + key.offset >= bytenr + num_bytes) { |
| num_bytes = 0; |
| break; |
| } |
| num_bytes = (bytenr + num_bytes) - |
| (key.objectid + key.offset); |
| bytenr = key.objectid + key.offset; |
| } else { |
| if (key.objectid + key.offset < bytenr + num_bytes) { |
| u64 new_start = key.objectid + key.offset; |
| u64 new_bytes = bytenr + num_bytes - new_start; |
| |
| /* |
| * Weird case, the extent is in the middle of |
| * our range, we'll have to search one side |
| * and then the other. Not sure if this happens |
| * in real life, but no harm in coding it up |
| * anyway just in case. |
| */ |
| btrfs_release_path(&path); |
| ret = check_extent_exists(root, new_start, |
| new_bytes); |
| if (ret) { |
| fprintf(stderr, "Right section didn't " |
| "have a record\n"); |
| break; |
| } |
| num_bytes = key.objectid - bytenr; |
| goto again; |
| } |
| num_bytes = key.objectid - bytenr; |
| } |
| path.slots[0]++; |
| } |
| ret = 0; |
| |
| out: |
| if (num_bytes && !ret) { |
| fprintf(stderr, "There are no extents for csum range " |
| "%Lu-%Lu\n", bytenr, bytenr+num_bytes); |
| ret = 1; |
| } |
| |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int check_csums(struct btrfs_root *root) |
| { |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| u64 offset = 0, num_bytes = 0; |
| u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
| int errors = 0; |
| int ret; |
| u64 data_len; |
| unsigned long leaf_offset; |
| |
| root = root->fs_info->csum_root; |
| if (!extent_buffer_uptodate(root->node)) { |
| fprintf(stderr, "No valid csum tree found\n"); |
| return -ENOENT; |
| } |
| |
| btrfs_init_path(&path); |
| key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| key.type = BTRFS_EXTENT_CSUM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error searching csum tree %d\n", ret); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| if (ret > 0 && path.slots[0]) |
| path.slots[0]--; |
| ret = 0; |
| |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(root, &path); |
| if (ret < 0) { |
| fprintf(stderr, "Error going to next leaf " |
| "%d\n", ret); |
| break; |
| } |
| if (ret) |
| break; |
| } |
| leaf = path.nodes[0]; |
| |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.type != BTRFS_EXTENT_CSUM_KEY) { |
| path.slots[0]++; |
| continue; |
| } |
| |
| data_len = (btrfs_item_size_nr(leaf, path.slots[0]) / |
| csum_size) * root->sectorsize; |
| if (!check_data_csum) |
| goto skip_csum_check; |
| leaf_offset = btrfs_item_ptr_offset(leaf, path.slots[0]); |
| ret = check_extent_csums(root, key.offset, data_len, |
| leaf_offset, leaf); |
| if (ret) |
| break; |
| skip_csum_check: |
| if (!num_bytes) { |
| offset = key.offset; |
| } else if (key.offset != offset + num_bytes) { |
| ret = check_extent_exists(root, offset, num_bytes); |
| if (ret) { |
| fprintf(stderr, "Csum exists for %Lu-%Lu but " |
| "there is no extent record\n", |
| offset, offset+num_bytes); |
| errors++; |
| } |
| offset = key.offset; |
| num_bytes = 0; |
| } |
| num_bytes += data_len; |
| path.slots[0]++; |
| } |
| |
| btrfs_release_path(&path); |
| return errors; |
| } |
| |
| static int is_dropped_key(struct btrfs_key *key, |
| struct btrfs_key *drop_key) { |
| if (key->objectid < drop_key->objectid) |
| return 1; |
| else if (key->objectid == drop_key->objectid) { |
| if (key->type < drop_key->type) |
| return 1; |
| else if (key->type == drop_key->type) { |
| if (key->offset < drop_key->offset) |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Here are the rules for FULL_BACKREF. |
| * |
| * 1) If BTRFS_HEADER_FLAG_RELOC is set then we have FULL_BACKREF set. |
| * 2) If btrfs_header_owner(buf) no longer points to buf then we have |
| * FULL_BACKREF set. |
| * 3) We cowed the block walking down a reloc tree. This is impossible to tell |
| * if it happened after the relocation occurred since we'll have dropped the |
| * reloc root, so it's entirely possible to have FULL_BACKREF set on buf and |
| * have no real way to know for sure. |
| * |
| * We process the blocks one root at a time, and we start from the lowest root |
| * objectid and go to the highest. So we can just lookup the owner backref for |
| * the record and if we don't find it then we know it doesn't exist and we have |
| * a FULL BACKREF. |
| * |
| * FIXME: if we ever start reclaiming root objectid's then we need to fix this |
| * assumption and simply indicate that we _think_ that the FULL BACKREF needs to |
| * be set or not and then we can check later once we've gathered all the refs. |
| */ |
| static int calc_extent_flag(struct cache_tree *extent_cache, |
| struct extent_buffer *buf, |
| struct root_item_record *ri, |
| u64 *flags) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| struct tree_backref *tback; |
| u64 owner = 0; |
| |
| cache = lookup_cache_extent(extent_cache, buf->start, 1); |
| /* we have added this extent before */ |
| if (!cache) |
| return -ENOENT; |
| |
| rec = container_of(cache, struct extent_record, cache); |
| |
| /* |
| * Except file/reloc tree, we can not have |
| * FULL BACKREF MODE |
| */ |
| if (ri->objectid < BTRFS_FIRST_FREE_OBJECTID) |
| goto normal; |
| /* |
| * root node |
| */ |
| if (buf->start == ri->bytenr) |
| goto normal; |
| |
| if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)) |
| goto full_backref; |
| |
| owner = btrfs_header_owner(buf); |
| if (owner == ri->objectid) |
| goto normal; |
| |
| tback = find_tree_backref(rec, 0, owner); |
| if (!tback) |
| goto full_backref; |
| normal: |
| *flags = 0; |
| if (rec->flag_block_full_backref != FLAG_UNSET && |
| rec->flag_block_full_backref != 0) |
| rec->bad_full_backref = 1; |
| return 0; |
| full_backref: |
| *flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| if (rec->flag_block_full_backref != FLAG_UNSET && |
| rec->flag_block_full_backref != 1) |
| rec->bad_full_backref = 1; |
| return 0; |
| } |
| |
| static void report_mismatch_key_root(u8 key_type, u64 rootid) |
| { |
| fprintf(stderr, "Invalid key type("); |
| print_key_type(stderr, 0, key_type); |
| fprintf(stderr, ") found in root("); |
| print_objectid(stderr, rootid, 0); |
| fprintf(stderr, ")\n"); |
| } |
| |
| /* |
| * Check if the key is valid with its extent buffer. |
| * |
| * This is a early check in case invalid key exists in a extent buffer |
| * This is not comprehensive yet, but should prevent wrong key/item passed |
| * further |
| */ |
| static int check_type_with_root(u64 rootid, u8 key_type) |
| { |
| switch (key_type) { |
| /* Only valid in chunk tree */ |
| case BTRFS_DEV_ITEM_KEY: |
| case BTRFS_CHUNK_ITEM_KEY: |
| if (rootid != BTRFS_CHUNK_TREE_OBJECTID) |
| goto err; |
| break; |
| /* valid in csum and log tree */ |
| case BTRFS_CSUM_TREE_OBJECTID: |
| if (!(rootid == BTRFS_TREE_LOG_OBJECTID || |
| is_fstree(rootid))) |
| goto err; |
| break; |
| case BTRFS_EXTENT_ITEM_KEY: |
| case BTRFS_METADATA_ITEM_KEY: |
| case BTRFS_BLOCK_GROUP_ITEM_KEY: |
| if (rootid != BTRFS_EXTENT_TREE_OBJECTID) |
| goto err; |
| break; |
| case BTRFS_ROOT_ITEM_KEY: |
| if (rootid != BTRFS_ROOT_TREE_OBJECTID) |
| goto err; |
| break; |
| case BTRFS_DEV_EXTENT_KEY: |
| if (rootid != BTRFS_DEV_TREE_OBJECTID) |
| goto err; |
| break; |
| } |
| return 0; |
| err: |
| report_mismatch_key_root(key_type, rootid); |
| return -EINVAL; |
| } |
| |
| static int run_next_block(struct btrfs_root *root, |
| struct block_info *bits, |
| int bits_nr, |
| u64 *last, |
| struct cache_tree *pending, |
| struct cache_tree *seen, |
| struct cache_tree *reada, |
| struct cache_tree *nodes, |
| struct cache_tree *extent_cache, |
| struct cache_tree *chunk_cache, |
| struct rb_root *dev_cache, |
| struct block_group_tree *block_group_cache, |
| struct device_extent_tree *dev_extent_cache, |
| struct root_item_record *ri) |
| { |
| struct extent_buffer *buf; |
| struct extent_record *rec = NULL; |
| u64 bytenr; |
| u32 size; |
| u64 parent; |
| u64 owner; |
| u64 flags; |
| u64 ptr; |
| u64 gen = 0; |
| int ret = 0; |
| int i; |
| int nritems; |
| struct btrfs_key key; |
| struct cache_extent *cache; |
| int reada_bits; |
| |
| nritems = pick_next_pending(pending, reada, nodes, *last, bits, |
| bits_nr, &reada_bits); |
| if (nritems == 0) |
| return 1; |
| |
| if (!reada_bits) { |
| for(i = 0; i < nritems; i++) { |
| ret = add_cache_extent(reada, bits[i].start, |
| bits[i].size); |
| if (ret == -EEXIST) |
| continue; |
| |
| /* fixme, get the parent transid */ |
| readahead_tree_block(root, bits[i].start, |
| bits[i].size, 0); |
| } |
| } |
| *last = bits[0].start; |
| bytenr = bits[0].start; |
| size = bits[0].size; |
| |
| cache = lookup_cache_extent(pending, bytenr, size); |
| if (cache) { |
| remove_cache_extent(pending, cache); |
| free(cache); |
| } |
| cache = lookup_cache_extent(reada, bytenr, size); |
| if (cache) { |
| remove_cache_extent(reada, cache); |
| free(cache); |
| } |
| cache = lookup_cache_extent(nodes, bytenr, size); |
| if (cache) { |
| remove_cache_extent(nodes, cache); |
| free(cache); |
| } |
| cache = lookup_cache_extent(extent_cache, bytenr, size); |
| if (cache) { |
| rec = container_of(cache, struct extent_record, cache); |
| gen = rec->parent_generation; |
| } |
| |
| /* fixme, get the real parent transid */ |
| buf = read_tree_block(root, bytenr, size, gen); |
| if (!extent_buffer_uptodate(buf)) { |
| record_bad_block_io(root->fs_info, |
| extent_cache, bytenr, size); |
| goto out; |
| } |
| |
| nritems = btrfs_header_nritems(buf); |
| |
| flags = 0; |
| if (!init_extent_tree) { |
| ret = btrfs_lookup_extent_info(NULL, root, bytenr, |
| btrfs_header_level(buf), 1, NULL, |
| &flags); |
| if (ret < 0) { |
| ret = calc_extent_flag(extent_cache, buf, ri, &flags); |
| if (ret < 0) { |
| fprintf(stderr, "Couldn't calc extent flags\n"); |
| flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| } |
| } |
| } else { |
| flags = 0; |
| ret = calc_extent_flag(extent_cache, buf, ri, &flags); |
| if (ret < 0) { |
| fprintf(stderr, "Couldn't calc extent flags\n"); |
| flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| } |
| } |
| |
| if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| if (ri != NULL && |
| ri->objectid != BTRFS_TREE_RELOC_OBJECTID && |
| ri->objectid == btrfs_header_owner(buf)) { |
| /* |
| * Ok we got to this block from it's original owner and |
| * we have FULL_BACKREF set. Relocation can leave |
| * converted blocks over so this is altogether possible, |
| * however it's not possible if the generation > the |
| * last snapshot, so check for this case. |
| */ |
| if (!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC) && |
| btrfs_header_generation(buf) > ri->last_snapshot) { |
| flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| rec->bad_full_backref = 1; |
| } |
| } |
| } else { |
| if (ri != NULL && |
| (ri->objectid == BTRFS_TREE_RELOC_OBJECTID || |
| btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))) { |
| flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| rec->bad_full_backref = 1; |
| } |
| } |
| |
| if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| rec->flag_block_full_backref = 1; |
| parent = bytenr; |
| owner = 0; |
| } else { |
| rec->flag_block_full_backref = 0; |
| parent = 0; |
| owner = btrfs_header_owner(buf); |
| } |
| |
| ret = check_block(root, extent_cache, buf, flags); |
| if (ret) |
| goto out; |
| |
| if (btrfs_is_leaf(buf)) { |
| btree_space_waste += btrfs_leaf_free_space(root, buf); |
| for (i = 0; i < nritems; i++) { |
| struct btrfs_file_extent_item *fi; |
| btrfs_item_key_to_cpu(buf, &key, i); |
| /* |
| * Check key type against the leaf owner. |
| * Could filter quite a lot of early error if |
| * owner is correct |
| */ |
| if (check_type_with_root(btrfs_header_owner(buf), |
| key.type)) { |
| fprintf(stderr, "ignoring invalid key\n"); |
| continue; |
| } |
| if (key.type == BTRFS_EXTENT_ITEM_KEY) { |
| process_extent_item(root, extent_cache, buf, |
| i); |
| continue; |
| } |
| if (key.type == BTRFS_METADATA_ITEM_KEY) { |
| process_extent_item(root, extent_cache, buf, |
| i); |
| continue; |
| } |
| if (key.type == BTRFS_EXTENT_CSUM_KEY) { |
| total_csum_bytes += |
| btrfs_item_size_nr(buf, i); |
| continue; |
| } |
| if (key.type == BTRFS_CHUNK_ITEM_KEY) { |
| process_chunk_item(chunk_cache, &key, buf, i); |
| continue; |
| } |
| if (key.type == BTRFS_DEV_ITEM_KEY) { |
| process_device_item(dev_cache, &key, buf, i); |
| continue; |
| } |
| if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| process_block_group_item(block_group_cache, |
| &key, buf, i); |
| continue; |
| } |
| if (key.type == BTRFS_DEV_EXTENT_KEY) { |
| process_device_extent_item(dev_extent_cache, |
| &key, buf, i); |
| continue; |
| |
| } |
| if (key.type == BTRFS_EXTENT_REF_V0_KEY) { |
| #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 |
| process_extent_ref_v0(extent_cache, buf, i); |
| #else |
| BUG(); |
| #endif |
| continue; |
| } |
| |
| if (key.type == BTRFS_TREE_BLOCK_REF_KEY) { |
| ret = add_tree_backref(extent_cache, |
| key.objectid, 0, key.offset, 0); |
| if (ret < 0) |
| error( |
| "add_tree_backref failed (leaf tree block): %s", |
| strerror(-ret)); |
| continue; |
| } |
| if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| ret = add_tree_backref(extent_cache, |
| key.objectid, key.offset, 0, 0); |
| if (ret < 0) |
| error( |
| "add_tree_backref failed (leaf shared block): %s", |
| strerror(-ret)); |
| continue; |
| } |
| if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { |
| struct btrfs_extent_data_ref *ref; |
| ref = btrfs_item_ptr(buf, i, |
| struct btrfs_extent_data_ref); |
| add_data_backref(extent_cache, |
| key.objectid, 0, |
| btrfs_extent_data_ref_root(buf, ref), |
| btrfs_extent_data_ref_objectid(buf, |
| ref), |
| btrfs_extent_data_ref_offset(buf, ref), |
| btrfs_extent_data_ref_count(buf, ref), |
| 0, root->sectorsize); |
| continue; |
| } |
| if (key.type == BTRFS_SHARED_DATA_REF_KEY) { |
| struct btrfs_shared_data_ref *ref; |
| ref = btrfs_item_ptr(buf, i, |
| struct btrfs_shared_data_ref); |
| add_data_backref(extent_cache, |
| key.objectid, key.offset, 0, 0, 0, |
| btrfs_shared_data_ref_count(buf, ref), |
| 0, root->sectorsize); |
| continue; |
| } |
| if (key.type == BTRFS_ORPHAN_ITEM_KEY) { |
| struct bad_item *bad; |
| |
| if (key.objectid == BTRFS_ORPHAN_OBJECTID) |
| continue; |
| if (!owner) |
| continue; |
| bad = malloc(sizeof(struct bad_item)); |
| if (!bad) |
| continue; |
| INIT_LIST_HEAD(&bad->list); |
| memcpy(&bad->key, &key, |
| sizeof(struct btrfs_key)); |
| bad->root_id = owner; |
| list_add_tail(&bad->list, &delete_items); |
| continue; |
| } |
| if (key.type != BTRFS_EXTENT_DATA_KEY) |
| continue; |
| fi = btrfs_item_ptr(buf, i, |
| struct btrfs_file_extent_item); |
| if (btrfs_file_extent_type(buf, fi) == |
| BTRFS_FILE_EXTENT_INLINE) |
| continue; |
| if (btrfs_file_extent_disk_bytenr(buf, fi) == 0) |
| continue; |
| |
| data_bytes_allocated += |
| btrfs_file_extent_disk_num_bytes(buf, fi); |
| if (data_bytes_allocated < root->sectorsize) { |
| abort(); |
| } |
| data_bytes_referenced += |
| btrfs_file_extent_num_bytes(buf, fi); |
| add_data_backref(extent_cache, |
| btrfs_file_extent_disk_bytenr(buf, fi), |
| parent, owner, key.objectid, key.offset - |
| btrfs_file_extent_offset(buf, fi), 1, 1, |
| btrfs_file_extent_disk_num_bytes(buf, fi)); |
| } |
| } else { |
| int level; |
| struct btrfs_key first_key; |
| |
| first_key.objectid = 0; |
| |
| if (nritems > 0) |
| btrfs_item_key_to_cpu(buf, &first_key, 0); |
| level = btrfs_header_level(buf); |
| for (i = 0; i < nritems; i++) { |
| struct extent_record tmpl; |
| |
| ptr = btrfs_node_blockptr(buf, i); |
| size = root->nodesize; |
| btrfs_node_key_to_cpu(buf, &key, i); |
| if (ri != NULL) { |
| if ((level == ri->drop_level) |
| && is_dropped_key(&key, &ri->drop_key)) { |
| continue; |
| } |
| } |
| |
| memset(&tmpl, 0, sizeof(tmpl)); |
| btrfs_cpu_key_to_disk(&tmpl.parent_key, &key); |
| tmpl.parent_generation = btrfs_node_ptr_generation(buf, i); |
| tmpl.start = ptr; |
| tmpl.nr = size; |
| tmpl.refs = 1; |
| tmpl.metadata = 1; |
| tmpl.max_size = size; |
| ret = add_extent_rec(extent_cache, &tmpl); |
| if (ret < 0) |
| goto out; |
| |
| ret = add_tree_backref(extent_cache, ptr, parent, |
| owner, 1); |
| if (ret < 0) { |
| error( |
| "add_tree_backref failed (non-leaf block): %s", |
| strerror(-ret)); |
| continue; |
| } |
| |
| if (level > 1) { |
| add_pending(nodes, seen, ptr, size); |
| } else { |
| add_pending(pending, seen, ptr, size); |
| } |
| } |
| btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) - |
| nritems) * sizeof(struct btrfs_key_ptr); |
| } |
| total_btree_bytes += buf->len; |
| if (fs_root_objectid(btrfs_header_owner(buf))) |
| total_fs_tree_bytes += buf->len; |
| if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) |
| total_extent_tree_bytes += buf->len; |
| if (!found_old_backref && |
| btrfs_header_owner(buf) == BTRFS_TREE_RELOC_OBJECTID && |
| btrfs_header_backref_rev(buf) == BTRFS_MIXED_BACKREF_REV && |
| !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)) |
| found_old_backref = 1; |
| out: |
| free_extent_buffer(buf); |
| return ret; |
| } |
| |
| static int add_root_to_pending(struct extent_buffer *buf, |
| struct cache_tree *extent_cache, |
| struct cache_tree *pending, |
| struct cache_tree *seen, |
| struct cache_tree *nodes, |
| u64 objectid) |
| { |
| struct extent_record tmpl; |
| int ret; |
| |
| if (btrfs_header_level(buf) > 0) |
| add_pending(nodes, seen, buf->start, buf->len); |
| else |
| add_pending(pending, seen, buf->start, buf->len); |
| |
| memset(&tmpl, 0, sizeof(tmpl)); |
| tmpl.start = buf->start; |
| tmpl.nr = buf->len; |
| tmpl.is_root = 1; |
| tmpl.refs = 1; |
| tmpl.metadata = 1; |
| tmpl.max_size = buf->len; |
| add_extent_rec(extent_cache, &tmpl); |
| |
| if (objectid == BTRFS_TREE_RELOC_OBJECTID || |
| btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV) |
| ret = add_tree_backref(extent_cache, buf->start, buf->start, |
| 0, 1); |
| else |
| ret = add_tree_backref(extent_cache, buf->start, 0, objectid, |
| 1); |
| return ret; |
| } |
| |
| /* as we fix the tree, we might be deleting blocks that |
| * we're tracking for repair. This hook makes sure we |
| * remove any backrefs for blocks as we are fixing them. |
| */ |
| static int free_extent_hook(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| u64 bytenr, u64 num_bytes, u64 parent, |
| u64 root_objectid, u64 owner, u64 offset, |
| int refs_to_drop) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| int is_data; |
| struct cache_tree *extent_cache = root->fs_info->fsck_extent_cache; |
| |
| is_data = owner >= BTRFS_FIRST_FREE_OBJECTID; |
| cache = lookup_cache_extent(extent_cache, bytenr, num_bytes); |
| if (!cache) |
| return 0; |
| |
| rec = container_of(cache, struct extent_record, cache); |
| if (is_data) { |
| struct data_backref *back; |
| back = find_data_backref(rec, parent, root_objectid, owner, |
| offset, 1, bytenr, num_bytes); |
| if (!back) |
| goto out; |
| if (back->node.found_ref) { |
| back->found_ref -= refs_to_drop; |
| if (rec->refs) |
| rec->refs -= refs_to_drop; |
| } |
| if (back->node.found_extent_tree) { |
| back->num_refs -= refs_to_drop; |
| if (rec->extent_item_refs) |
| rec->extent_item_refs -= refs_to_drop; |
| } |
| if (back->found_ref == 0) |
| back->node.found_ref = 0; |
| if (back->num_refs == 0) |
| back->node.found_extent_tree = 0; |
| |
| if (!back->node.found_extent_tree && back->node.found_ref) { |
| list_del(&back->node.list); |
| free(back); |
| } |
| } else { |
| struct tree_backref *back; |
| back = find_tree_backref(rec, parent, root_objectid); |
| if (!back) |
| goto out; |
| if (back->node.found_ref) { |
| if (rec->refs) |
| rec->refs--; |
| back->node.found_ref = 0; |
| } |
| if (back->node.found_extent_tree) { |
| if (rec->extent_item_refs) |
| rec->extent_item_refs--; |
| back->node.found_extent_tree = 0; |
| } |
| if (!back->node.found_extent_tree && back->node.found_ref) { |
| list_del(&back->node.list); |
| free(back); |
| } |
| } |
| maybe_free_extent_rec(extent_cache, rec); |
| out: |
| return 0; |
| } |
| |
| static int delete_extent_records(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, |
| struct btrfs_path *path, |
| u64 bytenr) |
| { |
| struct btrfs_key key; |
| struct btrfs_key found_key; |
| struct extent_buffer *leaf; |
| int ret; |
| int slot; |
| |
| |
| key.objectid = bytenr; |
| key.type = (u8)-1; |
| key.offset = (u64)-1; |
| |
| while(1) { |
| ret = btrfs_search_slot(trans, root->fs_info->extent_root, |
| &key, path, 0, 1); |
| if (ret < 0) |
| break; |
| |
| if (ret > 0) { |
| ret = 0; |
| if (path->slots[0] == 0) |
| break; |
| path->slots[0]--; |
| } |
| ret = 0; |
| |
| leaf = path->nodes[0]; |
| slot = path->slots[0]; |
| |
| btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| if (found_key.objectid != bytenr) |
| break; |
| |
| if (found_key.type != BTRFS_EXTENT_ITEM_KEY && |
| found_key.type != BTRFS_METADATA_ITEM_KEY && |
| found_key.type != BTRFS_TREE_BLOCK_REF_KEY && |
| found_key.type != BTRFS_EXTENT_DATA_REF_KEY && |
| found_key.type != BTRFS_EXTENT_REF_V0_KEY && |
| found_key.type != BTRFS_SHARED_BLOCK_REF_KEY && |
| found_key.type != BTRFS_SHARED_DATA_REF_KEY) { |
| btrfs_release_path(path); |
| if (found_key.type == 0) { |
| if (found_key.offset == 0) |
| break; |
| key.offset = found_key.offset - 1; |
| key.type = found_key.type; |
| } |
| key.type = found_key.type - 1; |
| key.offset = (u64)-1; |
| continue; |
| } |
| |
| fprintf(stderr, "repair deleting extent record: key %Lu %u %Lu\n", |
| found_key.objectid, found_key.type, found_key.offset); |
| |
| ret = btrfs_del_item(trans, root->fs_info->extent_root, path); |
| if (ret) |
| break; |
| btrfs_release_path(path); |
| |
| if (found_key.type == BTRFS_EXTENT_ITEM_KEY || |
| found_key.type == BTRFS_METADATA_ITEM_KEY) { |
| u64 bytes = (found_key.type == BTRFS_EXTENT_ITEM_KEY) ? |
| found_key.offset : root->nodesize; |
| |
| ret = btrfs_update_block_group(trans, root, bytenr, |
| bytes, 0, 0); |
| if (ret) |
| break; |
| } |
| } |
| |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| /* |
| * for a single backref, this will allocate a new extent |
| * and add the backref to it. |
| */ |
| static int record_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *info, |
| struct btrfs_path *path, |
| struct extent_record *rec, |
| struct extent_backref *back, |
| int allocated, u64 flags) |
| { |
| int ret = 0; |
| struct btrfs_root *extent_root = info->extent_root; |
| struct extent_buffer *leaf; |
| struct btrfs_key ins_key; |
| struct btrfs_extent_item *ei; |
| struct data_backref *dback; |
| struct btrfs_tree_block_info *bi; |
| |
| if (!back->is_data) |
| rec->max_size = max_t(u64, rec->max_size, |
| info->extent_root->nodesize); |
| |
| if (!allocated) { |
| u32 item_size = sizeof(*ei); |
| |
| if (!back->is_data) |
| item_size += sizeof(*bi); |
| |
| ins_key.objectid = rec->start; |
| ins_key.offset = rec->max_size; |
| ins_key.type = BTRFS_EXTENT_ITEM_KEY; |
| |
| ret = btrfs_insert_empty_item(trans, extent_root, path, |
| &ins_key, item_size); |
| if (ret) |
| goto fail; |
| |
| leaf = path->nodes[0]; |
| ei = btrfs_item_ptr(leaf, path->slots[0], |
| struct btrfs_extent_item); |
| |
| btrfs_set_extent_refs(leaf, ei, 0); |
| btrfs_set_extent_generation(leaf, ei, rec->generation); |
| |
| if (back->is_data) { |
| btrfs_set_extent_flags(leaf, ei, |
| BTRFS_EXTENT_FLAG_DATA); |
| } else { |
| struct btrfs_disk_key copy_key;; |
| |
| bi = (struct btrfs_tree_block_info *)(ei + 1); |
| memset_extent_buffer(leaf, 0, (unsigned long)bi, |
| sizeof(*bi)); |
| |
| btrfs_set_disk_key_objectid(©_key, |
| rec->info_objectid); |
| btrfs_set_disk_key_type(©_key, 0); |
| btrfs_set_disk_key_offset(©_key, 0); |
| |
| btrfs_set_tree_block_level(leaf, bi, rec->info_level); |
| btrfs_set_tree_block_key(leaf, bi, ©_key); |
| |
| btrfs_set_extent_flags(leaf, ei, |
| BTRFS_EXTENT_FLAG_TREE_BLOCK | flags); |
| } |
| |
| btrfs_mark_buffer_dirty(leaf); |
| ret = btrfs_update_block_group(trans, extent_root, rec->start, |
| rec->max_size, 1, 0); |
| if (ret) |
| goto fail; |
| btrfs_release_path(path); |
| } |
| |
| if (back->is_data) { |
| u64 parent; |
| int i; |
| |
| dback = to_data_backref(back); |
| if (back->full_backref) |
| parent = dback->parent; |
| else |
| parent = 0; |
| |
| for (i = 0; i < dback->found_ref; i++) { |
| /* if parent != 0, we're doing a full backref |
| * passing BTRFS_FIRST_FREE_OBJECTID as the owner |
| * just makes the backref allocator create a data |
| * backref |
| */ |
| ret = btrfs_inc_extent_ref(trans, info->extent_root, |
| rec->start, rec->max_size, |
| parent, |
| dback->root, |
| parent ? |
| BTRFS_FIRST_FREE_OBJECTID : |
| dback->owner, |
| dback->offset); |
| if (ret) |
| break; |
| } |
| fprintf(stderr, "adding new data backref" |
| " on %llu %s %llu owner %llu" |
| " offset %llu found %d\n", |
| (unsigned long long)rec->start, |
| back->full_backref ? |
| "parent" : "root", |
| back->full_backref ? |
| (unsigned long long)parent : |
| (unsigned long long)dback->root, |
| (unsigned long long)dback->owner, |
| (unsigned long long)dback->offset, |
| dback->found_ref); |
| } else { |
| u64 parent; |
| struct tree_backref *tback; |
| |
| tback = to_tree_backref(back); |
| if (back->full_backref) |
| parent = tback->parent; |
| else |
| parent = 0; |
| |
| ret = btrfs_inc_extent_ref(trans, info->extent_root, |
| rec->start, rec->max_size, |
| parent, tback->root, 0, 0); |
| fprintf(stderr, "adding new tree backref on " |
| "start %llu len %llu parent %llu root %llu\n", |
| rec->start, rec->max_size, parent, tback->root); |
| } |
| fail: |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| static struct extent_entry *find_entry(struct list_head *entries, |
| u64 bytenr, u64 bytes) |
| { |
| struct extent_entry *entry = NULL; |
| |
| list_for_each_entry(entry, entries, list) { |
| if (entry->bytenr == bytenr && entry->bytes == bytes) |
| return entry; |
| } |
| |
| return NULL; |
| } |
| |
| static struct extent_entry *find_most_right_entry(struct list_head *entries) |
| { |
| struct extent_entry *entry, *best = NULL, *prev = NULL; |
| |
| list_for_each_entry(entry, entries, list) { |
| /* |
| * If there are as many broken entries as entries then we know |
| * not to trust this particular entry. |
| */ |
| if (entry->broken == entry->count) |
| continue; |
| |
| /* |
| * Special case, when there are only two entries and 'best' is |
| * the first one |
| */ |
| if (!prev) { |
| best = entry; |
| prev = entry; |
| continue; |
| } |
| |
| /* |
| * If our current entry == best then we can't be sure our best |
| * is really the best, so we need to keep searching. |
| */ |
| if (best && best->count == entry->count) { |
| prev = entry; |
| best = NULL; |
| continue; |
| } |
| |
| /* Prev == entry, not good enough, have to keep searching */ |
| if (!prev->broken && prev->count == entry->count) |
| continue; |
| |
| if (!best) |
| best = (prev->count > entry->count) ? prev : entry; |
| else if (best->count < entry->count) |
| best = entry; |
| prev = entry; |
| } |
| |
| return best; |
| } |
| |
| static int repair_ref(struct btrfs_fs_info *info, struct btrfs_path *path, |
| struct data_backref *dback, struct extent_entry *entry) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_root *root; |
| struct btrfs_file_extent_item *fi; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| u64 bytenr, bytes; |
| int ret, err; |
| |
| key.objectid = dback->root; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| root = btrfs_read_fs_root(info, &key); |
| if (IS_ERR(root)) { |
| fprintf(stderr, "Couldn't find root for our ref\n"); |
| return -EINVAL; |
| } |
| |
| /* |
| * The backref points to the original offset of the extent if it was |
| * split, so we need to search down to the offset we have and then walk |
| * forward until we find the backref we're looking for. |
| */ |
| key.objectid = dback->owner; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| key.offset = dback->offset; |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error looking up ref %d\n", ret); |
| return ret; |
| } |
| |
| while (1) { |
| if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { |
| ret = btrfs_next_leaf(root, path); |
| if (ret) { |
| fprintf(stderr, "Couldn't find our ref, next\n"); |
| return -EINVAL; |
| } |
| } |
| leaf = path->nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| if (key.objectid != dback->owner || |
| key.type != BTRFS_EXTENT_DATA_KEY) { |
| fprintf(stderr, "Couldn't find our ref, search\n"); |
| return -EINVAL; |
| } |
| fi = btrfs_item_ptr(leaf, path->slots[0], |
| struct btrfs_file_extent_item); |
| bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| |
| if (bytenr == dback->disk_bytenr && bytes == dback->bytes) |
| break; |
| path->slots[0]++; |
| } |
| |
| btrfs_release_path(path); |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| /* |
| * Ok we have the key of the file extent we want to fix, now we can cow |
| * down to the thing and fix it. |
| */ |
| ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| if (ret < 0) { |
| fprintf(stderr, "Error cowing down to ref [%Lu, %u, %Lu]: %d\n", |
| key.objectid, key.type, key.offset, ret); |
| goto out; |
| } |
| if (ret > 0) { |
| fprintf(stderr, "Well that's odd, we just found this key " |
| "[%Lu, %u, %Lu]\n", key.objectid, key.type, |
| key.offset); |
| ret = -EINVAL; |
| goto out; |
| } |
| leaf = path->nodes[0]; |
| fi = btrfs_item_ptr(leaf, path->slots[0], |
| struct btrfs_file_extent_item); |
| |
| if (btrfs_file_extent_compression(leaf, fi) && |
| dback->disk_bytenr != entry->bytenr) { |
| fprintf(stderr, "Ref doesn't match the record start and is " |
| "compressed, please take a btrfs-image of this file " |
| "system and send it to a btrfs developer so they can " |
| "complete this functionality for bytenr %Lu\n", |
| dback->disk_bytenr); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (dback->node.broken && dback->disk_bytenr != entry->bytenr) { |
| btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); |
| } else if (dback->disk_bytenr > entry->bytenr) { |
| u64 off_diff, offset; |
| |
| off_diff = dback->disk_bytenr - entry->bytenr; |
| offset = btrfs_file_extent_offset(leaf, fi); |
| if (dback->disk_bytenr + offset + |
| btrfs_file_extent_num_bytes(leaf, fi) > |
| entry->bytenr + entry->bytes) { |
| fprintf(stderr, "Ref is past the entry end, please " |
| "take a btrfs-image of this file system and " |
| "send it to a btrfs developer, ref %Lu\n", |
| dback->disk_bytenr); |
| ret = -EINVAL; |
| goto out; |
| } |
| offset += off_diff; |
| btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); |
| btrfs_set_file_extent_offset(leaf, fi, offset); |
| } else if (dback->disk_bytenr < entry->bytenr) { |
| u64 offset; |
| |
| offset = btrfs_file_extent_offset(leaf, fi); |
| if (dback->disk_bytenr + offset < entry->bytenr) { |
| fprintf(stderr, "Ref is before the entry start, please" |
| " take a btrfs-image of this file system and " |
| "send it to a btrfs developer, ref %Lu\n", |
| dback->disk_bytenr); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| offset += dback->disk_bytenr; |
| offset -= entry->bytenr; |
| btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); |
| btrfs_set_file_extent_offset(leaf, fi, offset); |
| } |
| |
| btrfs_set_file_extent_disk_num_bytes(leaf, fi, entry->bytes); |
| |
| /* |
| * Chances are if disk_num_bytes were wrong then so is ram_bytes, but |
| * only do this if we aren't using compression, otherwise it's a |
| * trickier case. |
| */ |
| if (!btrfs_file_extent_compression(leaf, fi)) |
| btrfs_set_file_extent_ram_bytes(leaf, fi, entry->bytes); |
| else |
| printf("ram bytes may be wrong?\n"); |
| btrfs_mark_buffer_dirty(leaf); |
| out: |
| err = btrfs_commit_transaction(trans, root); |
| btrfs_release_path(path); |
| return ret ? ret : err; |
| } |
| |
| static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path, |
| struct extent_record *rec) |
| { |
| struct extent_backref *back; |
| struct data_backref *dback; |
| struct extent_entry *entry, *best = NULL; |
| LIST_HEAD(entries); |
| int nr_entries = 0; |
| int broken_entries = 0; |
| int ret = 0; |
| short mismatch = 0; |
| |
| /* |
| * Metadata is easy and the backrefs should always agree on bytenr and |
| * size, if not we've got bigger issues. |
| */ |
| if (rec->metadata) |
| return 0; |
| |
| list_for_each_entry(back, &rec->backrefs, list) { |
| if (back->full_backref || !back->is_data) |
| continue; |
| |
| dback = to_data_backref(back); |
| |
| /* |
| * We only pay attention to backrefs that we found a real |
| * backref for. |
| */ |
| if (dback->found_ref == 0) |
| continue; |
| |
| /* |
| * For now we only catch when the bytes don't match, not the |
| * bytenr. We can easily do this at the same time, but I want |
| * to have a fs image to test on before we just add repair |
| * functionality willy-nilly so we know we won't screw up the |
| * repair. |
| */ |
| |
| entry = find_entry(&entries, dback->disk_bytenr, |
| dback->bytes); |
| if (!entry) { |
| entry = malloc(sizeof(struct extent_entry)); |
| if (!entry) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| memset(entry, 0, sizeof(*entry)); |
| entry->bytenr = dback->disk_bytenr; |
| entry->bytes = dback->bytes; |
| list_add_tail(&entry->list, &entries); |
| nr_entries++; |
| } |
| |
| /* |
| * If we only have on entry we may think the entries agree when |
| * in reality they don't so we have to do some extra checking. |
| */ |
| if (dback->disk_bytenr != rec->start || |
| dback->bytes != rec->nr || back->broken) |
| mismatch = 1; |
| |
| if (back->broken) { |
| entry->broken++; |
| broken_entries++; |
| } |
| |
| entry->count++; |
| } |
| |
| /* Yay all the backrefs agree, carry on good sir */ |
| if (nr_entries <= 1 && !mismatch) |
| goto out; |
| |
| fprintf(stderr, "attempting to repair backref discrepency for bytenr " |
| "%Lu\n", rec->start); |
| |
| /* |
| * First we want to see if the backrefs can agree amongst themselves who |
| * is right, so figure out which one of the entries has the highest |
| * count. |
| */ |
| best = find_most_right_entry(&entries); |
| |
| /* |
| * Ok so we may have an even split between what the backrefs think, so |
| * this is where we use the extent ref to see what it thinks. |
| */ |
| if (!best) { |
| entry = find_entry(&entries, rec->start, rec->nr); |
| if (!entry && (!broken_entries || !rec->found_rec)) { |
| fprintf(stderr, "Backrefs don't agree with each other " |
| "and extent record doesn't agree with anybody," |
| " so we can't fix bytenr %Lu bytes %Lu\n", |
| rec->start, rec->nr); |
| ret = -EINVAL; |
| goto out; |
| } else if (!entry) { |
| /* |
| * Ok our backrefs were broken, we'll assume this is the |
| * correct value and add an entry for this range. |
| */ |
| entry = malloc(sizeof(struct extent_entry)); |
| if (!entry) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| memset(entry, 0, sizeof(*entry)); |
| entry->bytenr = rec->start; |
| entry->bytes = rec->nr; |
| list_add_tail(&entry->list, &entries); |
| nr_entries++; |
| } |
| entry->count++; |
| best = find_most_right_entry(&entries); |
| if (!best) { |
| fprintf(stderr, "Backrefs and extent record evenly " |
| "split on who is right, this is going to " |
| "require user input to fix bytenr %Lu bytes " |
| "%Lu\n", rec->start, rec->nr); |
| ret = -EINVAL; |
| goto out; |
| } |
| } |
| |
| /* |
| * I don't think this can happen currently as we'll abort() if we catch |
| * this case higher up, but in case somebody removes that we still can't |
| * deal with it properly here yet, so just bail out of that's the case. |
| */ |
| if (best->bytenr != rec->start) { |
| fprintf(stderr, "Extent start and backref starts don't match, " |
| "please use btrfs-image on this file system and send " |
| "it to a btrfs developer so they can make fsck fix " |
| "this particular case. bytenr is %Lu, bytes is %Lu\n", |
| rec->start, rec->nr); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* |
| * Ok great we all agreed on an extent record, let's go find the real |
| * references and fix up the ones that don't match. |
| */ |
| list_for_each_entry(back, &rec->backrefs, list) { |
| if (back->full_backref || !back->is_data) |
| continue; |
| |
| dback = to_data_backref(back); |
| |
| /* |
| * Still ignoring backrefs that don't have a real ref attached |
| * to them. |
| */ |
| if (dback->found_ref == 0) |
| continue; |
| |
| if (dback->bytes == best->bytes && |
| dback->disk_bytenr == best->bytenr) |
| continue; |
| |
| ret = repair_ref(info, path, dback, best); |
| if (ret) |
| goto out; |
| } |
| |
| /* |
| * Ok we messed with the actual refs, which means we need to drop our |
| * entire cache and go back and rescan. I know this is a huge pain and |
| * adds a lot of extra work, but it's the only way to be safe. Once all |
| * the backrefs agree we may not need to do anything to the extent |
| * record itself. |
| */ |
| ret = -EAGAIN; |
| out: |
| while (!list_empty(&entries)) { |
| entry = list_entry(entries.next, struct extent_entry, list); |
| list_del_init(&entry->list); |
| free(entry); |
| } |
| return ret; |
| } |
| |
| static int process_duplicates(struct cache_tree *extent_cache, |
| struct extent_record *rec) |
| { |
| struct extent_record *good, *tmp; |
| struct cache_extent *cache; |
| int ret; |
| |
| /* |
| * If we found a extent record for this extent then return, or if we |
| * have more than one duplicate we are likely going to need to delete |
| * something. |
| */ |
| if (rec->found_rec || rec->num_duplicates > 1) |
| return 0; |
| |
| /* Shouldn't happen but just in case */ |
| BUG_ON(!rec->num_duplicates); |
| |
| /* |
| * So this happens if we end up with a backref that doesn't match the |
| * actual extent entry. So either the backref is bad or the extent |
| * entry is bad. Either way we want to have the extent_record actually |
| * reflect what we found in the extent_tree, so we need to take the |
| * duplicate out and use that as the extent_record since the only way we |
| * get a duplicate is if we find a real life BTRFS_EXTENT_ITEM_KEY. |
| */ |
| remove_cache_extent(extent_cache, &rec->cache); |
| |
| good = to_extent_record(rec->dups.next); |
| list_del_init(&good->list); |
| INIT_LIST_HEAD(&good->backrefs); |
| INIT_LIST_HEAD(&good->dups); |
| good->cache.start = good->start; |
| good->cache.size = good->nr; |
| good->content_checked = 0; |
| good->owner_ref_checked = 0; |
| good->num_duplicates = 0; |
| good->refs = rec->refs; |
| list_splice_init(&rec->backrefs, &good->backrefs); |
| while (1) { |
| cache = lookup_cache_extent(extent_cache, good->start, |
| good->nr); |
| if (!cache) |
| break; |
| tmp = container_of(cache, struct extent_record, cache); |
| |
| /* |
| * If we find another overlapping extent and it's found_rec is |
| * set then it's a duplicate and we need to try and delete |
| * something. |
| */ |
| if (tmp->found_rec || tmp->num_duplicates > 0) { |
| if (list_empty(&good->list)) |
| list_add_tail(&good->list, |
| &duplicate_extents); |
| good->num_duplicates += tmp->num_duplicates + 1; |
| list_splice_init(&tmp->dups, &good->dups); |
| list_del_init(&tmp->list); |
| list_add_tail(&tmp->list, &good->dups); |
| remove_cache_extent(extent_cache, &tmp->cache); |
| continue; |
| } |
| |
| /* |
| * Ok we have another non extent item backed extent rec, so lets |
| * just add it to this extent and carry on like we did above. |
| */ |
| good->refs += tmp->refs; |
| list_splice_init(&tmp->backrefs, &good->backrefs); |
| remove_cache_extent(extent_cache, &tmp->cache); |
| free(tmp); |
| } |
| ret = insert_cache_extent(extent_cache, &good->cache); |
| BUG_ON(ret); |
| free(rec); |
| return good->num_duplicates ? 0 : 1; |
| } |
| |
| static int delete_duplicate_records(struct btrfs_root *root, |
| struct extent_record *rec) |
| { |
| struct btrfs_trans_handle *trans; |
| LIST_HEAD(delete_list); |
| struct btrfs_path path; |
| struct extent_record *tmp, *good, *n; |
| int nr_del = 0; |
| int ret = 0, err; |
| struct btrfs_key key; |
| |
| btrfs_init_path(&path); |
| |
| good = rec; |
| /* Find the record that covers all of the duplicates. */ |
| list_for_each_entry(tmp, &rec->dups, list) { |
| if (good->start < tmp->start) |
| continue; |
| if (good->nr > tmp->nr) |
| continue; |
| |
| if (tmp->start + tmp->nr < good->start + good->nr) { |
| fprintf(stderr, "Ok we have overlapping extents that " |
| "aren't completely covered by each other, this " |
| "is going to require more careful thought. " |
| "The extents are [%Lu-%Lu] and [%Lu-%Lu]\n", |
| tmp->start, tmp->nr, good->start, good->nr); |
| abort(); |
| } |
| good = tmp; |
| } |
| |
| if (good != rec) |
| list_add_tail(&rec->list, &delete_list); |
| |
| list_for_each_entry_safe(tmp, n, &rec->dups, list) { |
| if (tmp == good) |
| continue; |
| list_move_tail(&tmp->list, &delete_list); |
| } |
| |
| root = root->fs_info->extent_root; |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| goto out; |
| } |
| |
| list_for_each_entry(tmp, &delete_list, list) { |
| if (tmp->found_rec == 0) |
| continue; |
| key.objectid = tmp->start; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = tmp->nr; |
| |
| /* Shouldn't happen but just in case */ |
| if (tmp->metadata) { |
| fprintf(stderr, "Well this shouldn't happen, extent " |
| "record overlaps but is metadata? " |
| "[%Lu, %Lu]\n", tmp->start, tmp->nr); |
| abort(); |
| } |
| |
| ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); |
| if (ret) { |
| if (ret > 0) |
| ret = -EINVAL; |
| break; |
| } |
| ret = btrfs_del_item(trans, root, &path); |
| if (ret) |
| break; |
| btrfs_release_path(&path); |
| nr_del++; |
| } |
| err = btrfs_commit_transaction(trans, root); |
| if (err && !ret) |
| ret = err; |
| out: |
| while (!list_empty(&delete_list)) { |
| tmp = to_extent_record(delete_list.next); |
| list_del_init(&tmp->list); |
| if (tmp == rec) |
| continue; |
| free(tmp); |
| } |
| |
| while (!list_empty(&rec->dups)) { |
| tmp = to_extent_record(rec->dups.next); |
| list_del_init(&tmp->list); |
| free(tmp); |
| } |
| |
| btrfs_release_path(&path); |
| |
| if (!ret && !nr_del) |
| rec->num_duplicates = 0; |
| |
| return ret ? ret : nr_del; |
| } |
| |
| static int find_possible_backrefs(struct btrfs_fs_info *info, |
| struct btrfs_path *path, |
| struct cache_tree *extent_cache, |
| struct extent_record *rec) |
| { |
| struct btrfs_root *root; |
| struct extent_backref *back; |
| struct data_backref *dback; |
| struct cache_extent *cache; |
| struct btrfs_file_extent_item *fi; |
| struct btrfs_key key; |
| u64 bytenr, bytes; |
| int ret; |
| |
| list_for_each_entry(back, &rec->backrefs, list) { |
| /* Don't care about full backrefs (poor unloved backrefs) */ |
| if (back->full_backref || !back->is_data) |
| continue; |
| |
| dback = to_data_backref(back); |
| |
| /* We found this one, we don't need to do a lookup */ |
| if (dback->found_ref) |
| continue; |
| |
| key.objectid = dback->root; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| root = btrfs_read_fs_root(info, &key); |
| |
| /* No root, definitely a bad ref, skip */ |
| if (IS_ERR(root) && PTR_ERR(root) == -ENOENT) |
| continue; |
| /* Other err, exit */ |
| if (IS_ERR(root)) |
| return PTR_ERR(root); |
| |
| key.objectid = dback->owner; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| key.offset = dback->offset; |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret) { |
| btrfs_release_path(path); |
| if (ret < 0) |
| return ret; |
| /* Didn't find it, we can carry on */ |
| ret = 0; |
| continue; |
| } |
| |
| fi = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| struct btrfs_file_extent_item); |
| bytenr = btrfs_file_extent_disk_bytenr(path->nodes[0], fi); |
| bytes = btrfs_file_extent_disk_num_bytes(path->nodes[0], fi); |
| btrfs_release_path(path); |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (cache) { |
| struct extent_record *tmp; |
| tmp = container_of(cache, struct extent_record, cache); |
| |
| /* |
| * If we found an extent record for the bytenr for this |
| * particular backref then we can't add it to our |
| * current extent record. We only want to add backrefs |
| * that don't have a corresponding extent item in the |
| * extent tree since they likely belong to this record |
| * and we need to fix it if it doesn't match bytenrs. |
| */ |
| if (tmp->found_rec) |
| continue; |
| } |
| |
| dback->found_ref += 1; |
| dback->disk_bytenr = bytenr; |
| dback->bytes = bytes; |
| |
| /* |
| * Set this so the verify backref code knows not to trust the |
| * values in this backref. |
| */ |
| back->broken = 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Record orphan data ref into corresponding root. |
| * |
| * Return 0 if the extent item contains data ref and recorded. |
| * Return 1 if the extent item contains no useful data ref |
| * On that case, it may contains only shared_dataref or metadata backref |
| * or the file extent exists(this should be handled by the extent bytenr |
| * recovery routine) |
| * Return <0 if something goes wrong. |
| */ |
| static int record_orphan_data_extents(struct btrfs_fs_info *fs_info, |
| struct extent_record *rec) |
| { |
| struct btrfs_key key; |
| struct btrfs_root *dest_root; |
| struct extent_backref *back; |
| struct data_backref *dback; |
| struct orphan_data_extent *orphan; |
| struct btrfs_path path; |
| int recorded_data_ref = 0; |
| int ret = 0; |
| |
| if (rec->metadata) |
| return 1; |
| btrfs_init_path(&path); |
| list_for_each_entry(back, &rec->backrefs, list) { |
| if (back->full_backref || !back->is_data || |
| !back->found_extent_tree) |
| continue; |
| dback = to_data_backref(back); |
| if (dback->found_ref) |
| continue; |
| key.objectid = dback->root; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| dest_root = btrfs_read_fs_root(fs_info, &key); |
| |
| /* For non-exist root we just skip it */ |
| if (IS_ERR(dest_root) || !dest_root) |
| continue; |
| |
| key.objectid = dback->owner; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| key.offset = dback->offset; |
| |
| ret = btrfs_search_slot(NULL, dest_root, &key, &path, 0, 0); |
| btrfs_release_path(&path); |
| /* |
| * For ret < 0, it's OK since the fs-tree may be corrupted, |
| * we need to record it for inode/file extent rebuild. |
| * For ret > 0, we record it only for file extent rebuild. |
| * For ret == 0, the file extent exists but only bytenr |
| * mismatch, let the original bytenr fix routine to handle, |
| * don't record it. |
| */ |
| if (ret == 0) |
| continue; |
| ret = 0; |
| orphan = malloc(sizeof(*orphan)); |
| if (!orphan) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| INIT_LIST_HEAD(&orphan->list); |
| orphan->root = dback->root; |
| orphan->objectid = dback->owner; |
| orphan->offset = dback->offset; |
| orphan->disk_bytenr = rec->cache.start; |
| orphan->disk_len = rec->cache.size; |
| list_add(&dest_root->orphan_data_extents, &orphan->list); |
| recorded_data_ref = 1; |
| } |
| out: |
| btrfs_release_path(&path); |
| if (!ret) |
| return !recorded_data_ref; |
| else |
| return ret; |
| } |
| |
| /* |
| * when an incorrect extent item is found, this will delete |
| * all of the existing entries for it and recreate them |
| * based on what the tree scan found. |
| */ |
| static int fixup_extent_refs(struct btrfs_fs_info *info, |
| struct cache_tree *extent_cache, |
| struct extent_record *rec) |
| { |
| struct btrfs_trans_handle *trans = NULL; |
| int ret; |
| struct btrfs_path path; |
| struct list_head *cur = rec->backrefs.next; |
| struct cache_extent *cache; |
| struct extent_backref *back; |
| int allocated = 0; |
| u64 flags = 0; |
| |
| if (rec->flag_block_full_backref) |
| flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| |
| btrfs_init_path(&path); |
| if (rec->refs != rec->extent_item_refs && !rec->metadata) { |
| /* |
| * Sometimes the backrefs themselves are so broken they don't |
| * get attached to any meaningful rec, so first go back and |
| * check any of our backrefs that we couldn't find and throw |
| * them into the list if we find the backref so that |
| * verify_backrefs can figure out what to do. |
| */ |
| ret = find_possible_backrefs(info, &path, extent_cache, rec); |
| if (ret < 0) |
| goto out; |
| } |
| |
| /* step one, make sure all of the backrefs agree */ |
| ret = verify_backrefs(info, &path, rec); |
| if (ret < 0) |
| goto out; |
| |
| trans = btrfs_start_transaction(info->extent_root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| goto out; |
| } |
| |
| /* step two, delete all the existing records */ |
| ret = delete_extent_records(trans, info->extent_root, &path, |
| rec->start); |
| |
| if (ret < 0) |
| goto out; |
| |
| /* was this block corrupt? If so, don't add references to it */ |
| cache = lookup_cache_extent(info->corrupt_blocks, |
| rec->start, rec->max_size); |
| if (cache) { |
| ret = 0; |
| goto out; |
| } |
| |
| /* step three, recreate all the refs we did find */ |
| while(cur != &rec->backrefs) { |
| back = to_extent_backref(cur); |
| cur = cur->next; |
| |
| /* |
| * if we didn't find any references, don't create a |
| * new extent record |
| */ |
| if (!back->found_ref) |
| continue; |
| |
| rec->bad_full_backref = 0; |
| ret = record_extent(trans, info, &path, rec, back, allocated, flags); |
| allocated = 1; |
| |
| if (ret) |
| goto out; |
| } |
| out: |
| if (trans) { |
| int err = btrfs_commit_transaction(trans, info->extent_root); |
| if (!ret) |
| ret = err; |
| } |
| |
| if (!ret) |
| fprintf(stderr, "Repaired extent references for %llu\n", |
| (unsigned long long)rec->start); |
| |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int fixup_extent_flags(struct btrfs_fs_info *fs_info, |
| struct extent_record *rec) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_root *root = fs_info->extent_root; |
| struct btrfs_path path; |
| struct btrfs_extent_item *ei; |
| struct btrfs_key key; |
| u64 flags; |
| int ret = 0; |
| |
| key.objectid = rec->start; |
| if (rec->metadata) { |
| key.type = BTRFS_METADATA_ITEM_KEY; |
| key.offset = rec->info_level; |
| } else { |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = rec->max_size; |
| } |
| |
| trans = btrfs_start_transaction(root, 0); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); |
| if (ret < 0) { |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, root); |
| return ret; |
| } else if (ret) { |
| fprintf(stderr, "Didn't find extent for %llu\n", |
| (unsigned long long)rec->start); |
| btrfs_release_path(&path); |
| btrfs_commit_transaction(trans, root); |
| return -ENOENT; |
| } |
| |
| ei = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_extent_item); |
| flags = btrfs_extent_flags(path.nodes[0], ei); |
| if (rec->flag_block_full_backref) { |
| fprintf(stderr, "setting full backref on %llu\n", |
| (unsigned long long)key.objectid); |
| flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| } else { |
| fprintf(stderr, "clearing full backref on %llu\n", |
| (unsigned long long)key.objectid); |
| flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF; |
| } |
| btrfs_set_extent_flags(path.nodes[0], ei, flags); |
| btrfs_mark_buffer_dirty(path.nodes[0]); |
| btrfs_release_path(&path); |
| ret = btrfs_commit_transaction(trans, root); |
| if (!ret) |
| fprintf(stderr, "Repaired extent flags for %llu\n", |
| (unsigned long long)rec->start); |
| |
| return ret; |
| } |
| |
| /* right now we only prune from the extent allocation tree */ |
| static int prune_one_block(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *info, |
| struct btrfs_corrupt_block *corrupt) |
| { |
| int ret; |
| struct btrfs_path path; |
| struct extent_buffer *eb; |
| u64 found; |
| int slot; |
| int nritems; |
| int level = corrupt->level + 1; |
| |
| btrfs_init_path(&path); |
| again: |
| /* we want to stop at the parent to our busted block */ |
| path.lowest_level = level; |
| |
| ret = btrfs_search_slot(trans, info->extent_root, |
| &corrupt->key, &path, -1, 1); |
| |
| if (ret < 0) |
| goto out; |
| |
| eb = path.nodes[level]; |
| if (!eb) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| /* |
| * hopefully the search gave us the block we want to prune, |
| * lets try that first |
| */ |
| slot = path.slots[level]; |
| found = btrfs_node_blockptr(eb, slot); |
| if (found == corrupt->cache.start) |
| goto del_ptr; |
| |
| nritems = btrfs_header_nritems(eb); |
| |
| /* the search failed, lets scan this node and hope we find it */ |
| for (slot = 0; slot < nritems; slot++) { |
| found = btrfs_node_blockptr(eb, slot); |
| if (found == corrupt->cache.start) |
| goto del_ptr; |
| } |
| /* |
| * we couldn't find the bad block. TODO, search all the nodes for pointers |
| * to this block |
| */ |
| if (eb == info->extent_root->node) { |
| ret = -ENOENT; |
| goto out; |
| } else { |
| level++; |
| btrfs_release_path(&path); |
| goto again; |
| } |
| |
| del_ptr: |
| printk("deleting pointer to block %Lu\n", corrupt->cache.start); |
| ret = btrfs_del_ptr(info->extent_root, &path, level, slot); |
| |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int prune_corrupt_blocks(struct btrfs_fs_info *info) |
| { |
| struct btrfs_trans_handle *trans = NULL; |
| struct cache_extent *cache; |
| struct btrfs_corrupt_block *corrupt; |
| |
| while (1) { |
| cache = search_cache_extent(info->corrupt_blocks, 0); |
| if (!cache) |
| break; |
| if (!trans) { |
| trans = btrfs_start_transaction(info->extent_root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| } |
| corrupt = container_of(cache, struct btrfs_corrupt_block, cache); |
| prune_one_block(trans, info, corrupt); |
| remove_cache_extent(info->corrupt_blocks, cache); |
| } |
| if (trans) |
| return btrfs_commit_transaction(trans, info->extent_root); |
| return 0; |
| } |
| |
| static void reset_cached_block_groups(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_block_group_cache *cache; |
| u64 start, end; |
| int ret; |
| |
| while (1) { |
| ret = find_first_extent_bit(&fs_info->free_space_cache, 0, |
| &start, &end, EXTENT_DIRTY); |
| if (ret) |
| break; |
| clear_extent_dirty(&fs_info->free_space_cache, start, end); |
| } |
| |
| start = 0; |
| while (1) { |
| cache = btrfs_lookup_first_block_group(fs_info, start); |
| if (!cache) |
| break; |
| if (cache->cached) |
| cache->cached = 0; |
| start = cache->key.objectid + cache->key.offset; |
| } |
| } |
| |
| static int check_extent_refs(struct btrfs_root *root, |
| struct cache_tree *extent_cache) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| int ret = 0; |
| int had_dups = 0; |
| |
| if (repair) { |
| /* |
| * if we're doing a repair, we have to make sure |
| * we don't allocate from the problem extents. |
| * In the worst case, this will be all the |
| * extents in the FS |
| */ |
| cache = search_cache_extent(extent_cache, 0); |
| while(cache) { |
| rec = container_of(cache, struct extent_record, cache); |
| set_extent_dirty(root->fs_info->excluded_extents, |
| rec->start, |
| rec->start + rec->max_size - 1); |
| cache = next_cache_extent(cache); |
| } |
| |
| /* pin down all the corrupted blocks too */ |
| cache = search_cache_extent(root->fs_info->corrupt_blocks, 0); |
| while(cache) { |
| set_extent_dirty(root->fs_info->excluded_extents, |
| cache->start, |
| cache->start + cache->size - 1); |
| cache = next_cache_extent(cache); |
| } |
| prune_corrupt_blocks(root->fs_info); |
| reset_cached_block_groups(root->fs_info); |
| } |
| |
| reset_cached_block_groups(root->fs_info); |
| |
| /* |
| * We need to delete any duplicate entries we find first otherwise we |
| * could mess up the extent tree when we have backrefs that actually |
| * belong to a different extent item and not the weird duplicate one. |
| */ |
| while (repair && !list_empty(&duplicate_extents)) { |
| rec = to_extent_record(duplicate_extents.next); |
| list_del_init(&rec->list); |
| |
| /* Sometimes we can find a backref before we find an actual |
| * extent, so we need to process it a little bit to see if there |
| * truly are multiple EXTENT_ITEM_KEY's for the same range, or |
| * if this is a backref screwup. If we need to delete stuff |
| * process_duplicates() will return 0, otherwise it will return |
| * 1 and we |
| */ |
| if (process_duplicates(extent_cache, rec)) |
| continue; |
| ret = delete_duplicate_records(root, rec); |
| if (ret < 0) |
| return ret; |
| /* |
| * delete_duplicate_records will return the number of entries |
| * deleted, so if it's greater than 0 then we know we actually |
| * did something and we need to remove. |
| */ |
| if (ret) |
| had_dups = 1; |
| } |
| |
| if (had_dups) |
| return -EAGAIN; |
| |
| while(1) { |
| int cur_err = 0; |
| int fix = 0; |
| |
| cache = search_cache_extent(extent_cache, 0); |
| if (!cache) |
| break; |
| rec = container_of(cache, struct extent_record, cache); |
| if (rec->num_duplicates) { |
| fprintf(stderr, "extent item %llu has multiple extent " |
| "items\n", (unsigned long long)rec->start); |
| cur_err = 1; |
| } |
| |
| if (rec->refs != rec->extent_item_refs) { |
| fprintf(stderr, "ref mismatch on [%llu %llu] ", |
| (unsigned long long)rec->start, |
| (unsigned long long)rec->nr); |
| fprintf(stderr, "extent item %llu, found %llu\n", |
| (unsigned long long)rec->extent_item_refs, |
| (unsigned long long)rec->refs); |
| ret = record_orphan_data_extents(root->fs_info, rec); |
| if (ret < 0) |
| goto repair_abort; |
| fix = ret; |
| cur_err = 1; |
| } |
| if (all_backpointers_checked(rec, 1)) { |
| fprintf(stderr, "backpointer mismatch on [%llu %llu]\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)rec->nr); |
| fix = 1; |
| cur_err = 1; |
| } |
| if (!rec->owner_ref_checked) { |
| fprintf(stderr, "owner ref check failed [%llu %llu]\n", |
| (unsigned long long)rec->start, |
| (unsigned long long)rec->nr); |
| fix = 1; |
| cur_err = 1; |
| } |
| |
| if (repair && fix) { |
| ret = fixup_extent_refs(root->fs_info, extent_cache, rec); |
| if (ret) |
| goto repair_abort; |
| } |
| |
| |
| if (rec->bad_full_backref) { |
| fprintf(stderr, "bad full backref, on [%llu]\n", |
| (unsigned long long)rec->start); |
| if (repair) { |
| ret = fixup_extent_flags(root->fs_info, rec); |
| if (ret) |
| goto repair_abort; |
| fix = 1; |
| } |
| cur_err = 1; |
| } |
| /* |
| * Although it's not a extent ref's problem, we reuse this |
| * routine for error reporting. |
| * No repair function yet. |
| */ |
| if (rec->crossing_stripes) { |
| fprintf(stderr, |
| "bad metadata [%llu, %llu) crossing stripe boundary\n", |
| rec->start, rec->start + rec->max_size); |
| cur_err = 1; |
| } |
| |
| if (rec->wrong_chunk_type) { |
| fprintf(stderr, |
| "bad extent [%llu, %llu), type mismatch with chunk\n", |
| rec->start, rec->start + rec->max_size); |
| cur_err = 1; |
| } |
| |
| remove_cache_extent(extent_cache, cache); |
| free_all_extent_backrefs(rec); |
| if (!init_extent_tree && repair && (!cur_err || fix)) |
| clear_extent_dirty(root->fs_info->excluded_extents, |
| rec->start, |
| rec->start + rec->max_size - 1); |
| free(rec); |
| } |
| repair_abort: |
| if (repair) { |
| if (ret && ret != -EAGAIN) { |
| fprintf(stderr, "failed to repair damaged filesystem, aborting\n"); |
| exit(1); |
| } else if (!ret) { |
| struct btrfs_trans_handle *trans; |
| |
| root = root->fs_info->extent_root; |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| goto repair_abort; |
| } |
| |
| btrfs_fix_block_accounting(trans, root); |
| ret = btrfs_commit_transaction(trans, root); |
| if (ret) |
| goto repair_abort; |
| } |
| return ret; |
| } |
| return 0; |
| } |
| |
| u64 calc_stripe_length(u64 type, u64 length, int num_stripes) |
| { |
| u64 stripe_size; |
| |
| if (type & BTRFS_BLOCK_GROUP_RAID0) { |
| stripe_size = length; |
| stripe_size /= num_stripes; |
| } else if (type & BTRFS_BLOCK_GROUP_RAID10) { |
| stripe_size = length * 2; |
| stripe_size /= num_stripes; |
| } else if (type & BTRFS_BLOCK_GROUP_RAID5) { |
| stripe_size = length; |
| stripe_size /= (num_stripes - 1); |
| } else if (type & BTRFS_BLOCK_GROUP_RAID6) { |
| stripe_size = length; |
| stripe_size /= (num_stripes - 2); |
| } else { |
| stripe_size = length; |
| } |
| return stripe_size; |
| } |
| |
| /* |
| * Check the chunk with its block group/dev list ref: |
| * Return 0 if all refs seems valid. |
| * Return 1 if part of refs seems valid, need later check for rebuild ref |
| * like missing block group and needs to search extent tree to rebuild them. |
| * Return -1 if essential refs are missing and unable to rebuild. |
| */ |
| static int check_chunk_refs(struct chunk_record *chunk_rec, |
| struct block_group_tree *block_group_cache, |
| struct device_extent_tree *dev_extent_cache, |
| int silent) |
| { |
| struct cache_extent *block_group_item; |
| struct block_group_record *block_group_rec; |
| struct cache_extent *dev_extent_item; |
| struct device_extent_record *dev_extent_rec; |
| u64 devid; |
| u64 offset; |
| u64 length; |
| int metadump_v2 = 0; |
| int i; |
| int ret = 0; |
| |
| block_group_item = lookup_cache_extent(&block_group_cache->tree, |
| chunk_rec->offset, |
| chunk_rec->length); |
| if (block_group_item) { |
| block_group_rec = container_of(block_group_item, |
| struct block_group_record, |
| cache); |
| if (chunk_rec->length != block_group_rec->offset || |
| chunk_rec->offset != block_group_rec->objectid || |
| (!metadump_v2 && |
| chunk_rec->type_flags != block_group_rec->flags)) { |
| if (!silent) |
| fprintf(stderr, |
| "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) mismatch with block group[%llu, %u, %llu]: offset(%llu), objectid(%llu), flags(%llu)\n", |
| chunk_rec->objectid, |
| chunk_rec->type, |
| chunk_rec->offset, |
| chunk_rec->length, |
| chunk_rec->offset, |
| chunk_rec->type_flags, |
| block_group_rec->objectid, |
| block_group_rec->type, |
| block_group_rec->offset, |
| block_group_rec->offset, |
| block_group_rec->objectid, |
| block_group_rec->flags); |
| ret = -1; |
| } else { |
| list_del_init(&block_group_rec->list); |
| chunk_rec->bg_rec = block_group_rec; |
| } |
| } else { |
| if (!silent) |
| fprintf(stderr, |
| "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) is not found in block group\n", |
| chunk_rec->objectid, |
| chunk_rec->type, |
| chunk_rec->offset, |
| chunk_rec->length, |
| chunk_rec->offset, |
| chunk_rec->type_flags); |
| ret = 1; |
| } |
| |
| if (metadump_v2) |
| return ret; |
| |
| length = calc_stripe_length(chunk_rec->type_flags, chunk_rec->length, |
| chunk_rec->num_stripes); |
| for (i = 0; i < chunk_rec->num_stripes; ++i) { |
| devid = chunk_rec->stripes[i].devid; |
| offset = chunk_rec->stripes[i].offset; |
| dev_extent_item = lookup_cache_extent2(&dev_extent_cache->tree, |
| devid, offset, length); |
| if (dev_extent_item) { |
| dev_extent_rec = container_of(dev_extent_item, |
| struct device_extent_record, |
| cache); |
| if (dev_extent_rec->objectid != devid || |
| dev_extent_rec->offset != offset || |
| dev_extent_rec->chunk_offset != chunk_rec->offset || |
| dev_extent_rec->length != length) { |
| if (!silent) |
| fprintf(stderr, |
| "Chunk[%llu, %u, %llu] stripe[%llu, %llu] dismatch dev extent[%llu, %llu, %llu]\n", |
| chunk_rec->objectid, |
| chunk_rec->type, |
| chunk_rec->offset, |
| chunk_rec->stripes[i].devid, |
| chunk_rec->stripes[i].offset, |
| dev_extent_rec->objectid, |
| dev_extent_rec->offset, |
| dev_extent_rec->length); |
| ret = -1; |
| } else { |
| list_move(&dev_extent_rec->chunk_list, |
| &chunk_rec->dextents); |
| } |
| } else { |
| if (!silent) |
| fprintf(stderr, |
| "Chunk[%llu, %u, %llu] stripe[%llu, %llu] is not found in dev extent\n", |
| chunk_rec->objectid, |
| chunk_rec->type, |
| chunk_rec->offset, |
| chunk_rec->stripes[i].devid, |
| chunk_rec->stripes[i].offset); |
| ret = -1; |
| } |
| } |
| return ret; |
| } |
| |
| /* check btrfs_chunk -> btrfs_dev_extent / btrfs_block_group_item */ |
| int check_chunks(struct cache_tree *chunk_cache, |
| struct block_group_tree *block_group_cache, |
| struct device_extent_tree *dev_extent_cache, |
| struct list_head *good, struct list_head *bad, |
| struct list_head *rebuild, int silent) |
| { |
| struct cache_extent *chunk_item; |
| struct chunk_record *chunk_rec; |
| struct block_group_record *bg_rec; |
| struct device_extent_record *dext_rec; |
| int err; |
| int ret = 0; |
| |
| chunk_item = first_cache_extent(chunk_cache); |
| while (chunk_item) { |
| chunk_rec = container_of(chunk_item, struct chunk_record, |
| cache); |
| err = check_chunk_refs(chunk_rec, block_group_cache, |
| dev_extent_cache, silent); |
| if (err < 0) |
| ret = err; |
| if (err == 0 && good) |
| list_add_tail(&chunk_rec->list, good); |
| if (err > 0 && rebuild) |
| list_add_tail(&chunk_rec->list, rebuild); |
| if (err < 0 && bad) |
| list_add_tail(&chunk_rec->list, bad); |
| chunk_item = next_cache_extent(chunk_item); |
| } |
| |
| list_for_each_entry(bg_rec, &block_group_cache->block_groups, list) { |
| if (!silent) |
| fprintf(stderr, |
| "Block group[%llu, %llu] (flags = %llu) didn't find the relative chunk.\n", |
| bg_rec->objectid, |
| bg_rec->offset, |
| bg_rec->flags); |
| if (!ret) |
| ret = 1; |
| } |
| |
| list_for_each_entry(dext_rec, &dev_extent_cache->no_chunk_orphans, |
| chunk_list) { |
| if (!silent) |
| fprintf(stderr, |
| "Device extent[%llu, %llu, %llu] didn't find the relative chunk.\n", |
| dext_rec->objectid, |
| dext_rec->offset, |
| dext_rec->length); |
| if (!ret) |
| ret = 1; |
| } |
| return ret; |
| } |
| |
| |
| static int check_device_used(struct device_record *dev_rec, |
| struct device_extent_tree *dext_cache) |
| { |
| struct cache_extent *cache; |
| struct device_extent_record *dev_extent_rec; |
| u64 total_byte = 0; |
| |
| cache = search_cache_extent2(&dext_cache->tree, dev_rec->devid, 0); |
| while (cache) { |
| dev_extent_rec = container_of(cache, |
| struct device_extent_record, |
| cache); |
| if (dev_extent_rec->objectid != dev_rec->devid) |
| break; |
| |
| list_del_init(&dev_extent_rec->device_list); |
| total_byte += dev_extent_rec->length; |
| cache = next_cache_extent(cache); |
| } |
| |
| if (total_byte != dev_rec->byte_used) { |
| fprintf(stderr, |
| "Dev extent's total-byte(%llu) is not equal to byte-used(%llu) in dev[%llu, %u, %llu]\n", |
| total_byte, dev_rec->byte_used, dev_rec->objectid, |
| dev_rec->type, dev_rec->offset); |
| return -1; |
| } else { |
| return 0; |
| } |
| } |
| |
| /* check btrfs_dev_item -> btrfs_dev_extent */ |
| static int check_devices(struct rb_root *dev_cache, |
| struct device_extent_tree *dev_extent_cache) |
| { |
| struct rb_node *dev_node; |
| struct device_record *dev_rec; |
| struct device_extent_record *dext_rec; |
| int err; |
| int ret = 0; |
| |
| dev_node = rb_first(dev_cache); |
| while (dev_node) { |
| dev_rec = container_of(dev_node, struct device_record, node); |
| err = check_device_used(dev_rec, dev_extent_cache); |
| if (err) |
| ret = err; |
| |
| dev_node = rb_next(dev_node); |
| } |
| list_for_each_entry(dext_rec, &dev_extent_cache->no_device_orphans, |
| device_list) { |
| fprintf(stderr, |
| "Device extent[%llu, %llu, %llu] didn't find its device.\n", |
| dext_rec->objectid, dext_rec->offset, dext_rec->length); |
| if (!ret) |
| ret = 1; |
| } |
| return ret; |
| } |
| |
| static int add_root_item_to_list(struct list_head *head, |
| u64 objectid, u64 bytenr, u64 last_snapshot, |
| u8 level, u8 drop_level, |
| int level_size, struct btrfs_key *drop_key) |
| { |
| |
| struct root_item_record *ri_rec; |
| ri_rec = malloc(sizeof(*ri_rec)); |
| if (!ri_rec) |
| return -ENOMEM; |
| ri_rec->bytenr = bytenr; |
| ri_rec->objectid = objectid; |
| ri_rec->level = level; |
| ri_rec->level_size = level_size; |
| ri_rec->drop_level = drop_level; |
| ri_rec->last_snapshot = last_snapshot; |
| if (drop_key) |
| memcpy(&ri_rec->drop_key, drop_key, sizeof(*drop_key)); |
| list_add_tail(&ri_rec->list, head); |
| |
| return 0; |
| } |
| |
| static void free_root_item_list(struct list_head *list) |
| { |
| struct root_item_record *ri_rec; |
| |
| while (!list_empty(list)) { |
| ri_rec = list_first_entry(list, struct root_item_record, |
| list); |
| list_del_init(&ri_rec->list); |
| free(ri_rec); |
| } |
| } |
| |
| static int deal_root_from_list(struct list_head *list, |
| struct btrfs_root *root, |
| struct block_info *bits, |
| int bits_nr, |
| struct cache_tree *pending, |
| struct cache_tree *seen, |
| struct cache_tree *reada, |
| struct cache_tree *nodes, |
| struct cache_tree *extent_cache, |
| struct cache_tree *chunk_cache, |
| struct rb_root *dev_cache, |
| struct block_group_tree *block_group_cache, |
| struct device_extent_tree *dev_extent_cache) |
| { |
| int ret = 0; |
| u64 last; |
| |
| while (!list_empty(list)) { |
| struct root_item_record *rec; |
| struct extent_buffer *buf; |
| rec = list_entry(list->next, |
| struct root_item_record, list); |
| last = 0; |
| buf = read_tree_block(root->fs_info->tree_root, |
| rec->bytenr, rec->level_size, 0); |
| if (!extent_buffer_uptodate(buf)) { |
| free_extent_buffer(buf); |
| ret = -EIO; |
| break; |
| } |
| ret = add_root_to_pending(buf, extent_cache, pending, |
| seen, nodes, rec->objectid); |
| if (ret < 0) |
| break; |
| /* |
| * To rebuild extent tree, we need deal with snapshot |
| * one by one, otherwise we deal with node firstly which |
| * can maximize readahead. |
| */ |
| while (1) { |
| ret = run_next_block(root, bits, bits_nr, &last, |
| pending, seen, reada, nodes, |
| extent_cache, chunk_cache, |
| dev_cache, block_group_cache, |
| dev_extent_cache, rec); |
| if (ret != 0) |
| break; |
| } |
| free_extent_buffer(buf); |
| list_del(&rec->list); |
| free(rec); |
| if (ret < 0) |
| break; |
| } |
| while (ret >= 0) { |
| ret = run_next_block(root, bits, bits_nr, &last, pending, seen, |
| reada, nodes, extent_cache, chunk_cache, |
| dev_cache, block_group_cache, |
| dev_extent_cache, NULL); |
| if (ret != 0) { |
| if (ret > 0) |
| ret = 0; |
| break; |
| } |
| } |
| return ret; |
| } |
| |
| static int check_chunks_and_extents(struct btrfs_root *root) |
| { |
| struct rb_root dev_cache; |
| struct cache_tree chunk_cache; |
| struct block_group_tree block_group_cache; |
| struct device_extent_tree dev_extent_cache; |
| struct cache_tree extent_cache; |
| struct cache_tree seen; |
| struct cache_tree pending; |
| struct cache_tree reada; |
| struct cache_tree nodes; |
| struct extent_io_tree excluded_extents; |
| struct cache_tree corrupt_blocks; |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_key found_key; |
| int ret, err = 0; |
| struct block_info *bits; |
| int bits_nr; |
| struct extent_buffer *leaf; |
| int slot; |
| struct btrfs_root_item ri; |
| struct list_head dropping_trees; |
| struct list_head normal_trees; |
| struct btrfs_root *root1; |
| u64 objectid; |
| u32 level_size; |
| u8 level; |
| |
| dev_cache = RB_ROOT; |
| cache_tree_init(&chunk_cache); |
| block_group_tree_init(&block_group_cache); |
| device_extent_tree_init(&dev_extent_cache); |
| |
| cache_tree_init(&extent_cache); |
| cache_tree_init(&seen); |
| cache_tree_init(&pending); |
| cache_tree_init(&nodes); |
| cache_tree_init(&reada); |
| cache_tree_init(&corrupt_blocks); |
| extent_io_tree_init(&excluded_extents); |
| INIT_LIST_HEAD(&dropping_trees); |
| INIT_LIST_HEAD(&normal_trees); |
| |
| if (repair) { |
| root->fs_info->excluded_extents = &excluded_extents; |
| root->fs_info->fsck_extent_cache = &extent_cache; |
| root->fs_info->free_extent_hook = free_extent_hook; |
| root->fs_info->corrupt_blocks = &corrupt_blocks; |
| } |
| |
| bits_nr = 1024; |
| bits = malloc(bits_nr * sizeof(struct block_info)); |
| if (!bits) { |
| perror("malloc"); |
| exit(1); |
| } |
| |
| if (ctx.progress_enabled) { |
| ctx.tp = TASK_EXTENTS; |
| task_start(ctx.info); |
| } |
| |
| again: |
| root1 = root->fs_info->tree_root; |
| level = btrfs_header_level(root1->node); |
| ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid, |
| root1->node->start, 0, level, 0, |
| root1->nodesize, NULL); |
| if (ret < 0) |
| goto out; |
| root1 = root->fs_info->chunk_root; |
| level = btrfs_header_level(root1->node); |
| ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid, |
| root1->node->start, 0, level, 0, |
| root1->nodesize, NULL); |
| if (ret < 0) |
| goto out; |
| btrfs_init_path(&path); |
| key.offset = 0; |
| key.objectid = 0; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| ret = btrfs_search_slot(NULL, root->fs_info->tree_root, |
| &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| while(1) { |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| if (slot >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(root, &path); |
| if (ret != 0) |
| break; |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| } |
| btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); |
| if (found_key.type == BTRFS_ROOT_ITEM_KEY) { |
| unsigned long offset; |
| u64 last_snapshot; |
| |
| offset = btrfs_item_ptr_offset(leaf, path.slots[0]); |
| read_extent_buffer(leaf, &ri, offset, sizeof(ri)); |
| last_snapshot = btrfs_root_last_snapshot(&ri); |
| if (btrfs_disk_key_objectid(&ri.drop_progress) == 0) { |
| level = btrfs_root_level(&ri); |
| level_size = root->nodesize; |
| ret = add_root_item_to_list(&normal_trees, |
| found_key.objectid, |
| btrfs_root_bytenr(&ri), |
| last_snapshot, level, |
| 0, level_size, NULL); |
| if (ret < 0) |
| goto out; |
| } else { |
| level = btrfs_root_level(&ri); |
| level_size = root->nodesize; |
| objectid = found_key.objectid; |
| btrfs_disk_key_to_cpu(&found_key, |
| &ri.drop_progress); |
| ret = add_root_item_to_list(&dropping_trees, |
| objectid, |
| btrfs_root_bytenr(&ri), |
| last_snapshot, level, |
| ri.drop_level, |
| level_size, &found_key); |
| if (ret < 0) |
| goto out; |
| } |
| } |
| path.slots[0]++; |
| } |
| btrfs_release_path(&path); |
| |
| /* |
| * check_block can return -EAGAIN if it fixes something, please keep |
| * this in mind when dealing with return values from these functions, if |
| * we get -EAGAIN we want to fall through and restart the loop. |
| */ |
| ret = deal_root_from_list(&normal_trees, root, bits, bits_nr, &pending, |
| &seen, &reada, &nodes, &extent_cache, |
| &chunk_cache, &dev_cache, &block_group_cache, |
| &dev_extent_cache); |
| if (ret < 0) { |
| if (ret == -EAGAIN) |
| goto loop; |
| goto out; |
| } |
| ret = deal_root_from_list(&dropping_trees, root, bits, bits_nr, |
| &pending, &seen, &reada, &nodes, |
| &extent_cache, &chunk_cache, &dev_cache, |
| &block_group_cache, &dev_extent_cache); |
| if (ret < 0) { |
| if (ret == -EAGAIN) |
| goto loop; |
| goto out; |
| } |
| |
| ret = check_chunks(&chunk_cache, &block_group_cache, |
| &dev_extent_cache, NULL, NULL, NULL, 0); |
| if (ret) { |
| if (ret == -EAGAIN) |
| goto loop; |
| err = ret; |
| } |
| |
| ret = check_extent_refs(root, &extent_cache); |
| if (ret < 0) { |
| if (ret == -EAGAIN) |
| goto loop; |
| goto out; |
| } |
| |
| ret = check_devices(&dev_cache, &dev_extent_cache); |
| if (ret && err) |
| ret = err; |
| |
| out: |
| task_stop(ctx.info); |
| if (repair) { |
| free_corrupt_blocks_tree(root->fs_info->corrupt_blocks); |
| extent_io_tree_cleanup(&excluded_extents); |
| root->fs_info->fsck_extent_cache = NULL; |
| root->fs_info->free_extent_hook = NULL; |
| root->fs_info->corrupt_blocks = NULL; |
| root->fs_info->excluded_extents = NULL; |
| } |
| free(bits); |
| free_chunk_cache_tree(&chunk_cache); |
| free_device_cache_tree(&dev_cache); |
| free_block_group_tree(&block_group_cache); |
| free_device_extent_tree(&dev_extent_cache); |
| free_extent_cache_tree(&seen); |
| free_extent_cache_tree(&pending); |
| free_extent_cache_tree(&reada); |
| free_extent_cache_tree(&nodes); |
| free_root_item_list(&normal_trees); |
| free_root_item_list(&dropping_trees); |
| return ret; |
| loop: |
| free_corrupt_blocks_tree(root->fs_info->corrupt_blocks); |
| free_extent_cache_tree(&seen); |
| free_extent_cache_tree(&pending); |
| free_extent_cache_tree(&reada); |
| free_extent_cache_tree(&nodes); |
| free_chunk_cache_tree(&chunk_cache); |
| free_block_group_tree(&block_group_cache); |
| free_device_cache_tree(&dev_cache); |
| free_device_extent_tree(&dev_extent_cache); |
| free_extent_record_cache(&extent_cache); |
| free_root_item_list(&normal_trees); |
| free_root_item_list(&dropping_trees); |
| extent_io_tree_cleanup(&excluded_extents); |
| goto again; |
| } |
| |
| /* |
| * Check backrefs of a tree block given by @bytenr or @eb. |
| * |
| * @root: the root containing the @bytenr or @eb |
| * @eb: tree block extent buffer, can be NULL |
| * @bytenr: bytenr of the tree block to search |
| * @level: tree level of the tree block |
| * @owner: owner of the tree block |
| * |
| * Return >0 for any error found and output error message |
| * Return 0 for no error found |
| */ |
| static int check_tree_block_ref(struct btrfs_root *root, |
| struct extent_buffer *eb, u64 bytenr, |
| int level, u64 owner) |
| { |
| struct btrfs_key key; |
| struct btrfs_root *extent_root = root->fs_info->extent_root; |
| struct btrfs_path path; |
| struct btrfs_extent_item *ei; |
| struct btrfs_extent_inline_ref *iref; |
| struct extent_buffer *leaf; |
| unsigned long end; |
| unsigned long ptr; |
| int slot; |
| int skinny_level; |
| int type; |
| u32 nodesize = root->nodesize; |
| u32 item_size; |
| u64 offset; |
| int tree_reloc_root = 0; |
| int found_ref = 0; |
| int err = 0; |
| int ret; |
| |
| if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID && |
| btrfs_header_bytenr(root->node) == bytenr) |
| tree_reloc_root = 1; |
| |
| btrfs_init_path(&path); |
| key.objectid = bytenr; |
| if (btrfs_fs_incompat(root->fs_info, SKINNY_METADATA)) |
| key.type = BTRFS_METADATA_ITEM_KEY; |
| else |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| /* Search for the backref in extent tree */ |
| ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| err |= BACKREF_MISSING; |
| goto out; |
| } |
| ret = btrfs_previous_extent_item(extent_root, &path, bytenr); |
| if (ret) { |
| err |= BACKREF_MISSING; |
| goto out; |
| } |
| |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| btrfs_item_key_to_cpu(leaf, &key, slot); |
| |
| ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); |
| |
| if (key.type == BTRFS_METADATA_ITEM_KEY) { |
| skinny_level = (int)key.offset; |
| iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| } else { |
| struct btrfs_tree_block_info *info; |
| |
| info = (struct btrfs_tree_block_info *)(ei + 1); |
| skinny_level = btrfs_tree_block_level(leaf, info); |
| iref = (struct btrfs_extent_inline_ref *)(info + 1); |
| } |
| |
| if (eb) { |
| u64 header_gen; |
| u64 extent_gen; |
| |
| if (!(btrfs_extent_flags(leaf, ei) & |
| BTRFS_EXTENT_FLAG_TREE_BLOCK)) { |
| error( |
| "extent[%llu %u] backref type mismatch, missing bit: %llx", |
| key.objectid, nodesize, |
| BTRFS_EXTENT_FLAG_TREE_BLOCK); |
| err = BACKREF_MISMATCH; |
| } |
| header_gen = btrfs_header_generation(eb); |
| extent_gen = btrfs_extent_generation(leaf, ei); |
| if (header_gen != extent_gen) { |
| error( |
| "extent[%llu %u] backref generation mismatch, wanted: %llu, have: %llu", |
| key.objectid, nodesize, header_gen, |
| extent_gen); |
| err = BACKREF_MISMATCH; |
| } |
| if (level != skinny_level) { |
| error( |
| "extent[%llu %u] level mismatch, wanted: %u, have: %u", |
| key.objectid, nodesize, level, skinny_level); |
| err = BACKREF_MISMATCH; |
| } |
| if (!is_fstree(owner) && btrfs_extent_refs(leaf, ei) != 1) { |
| error( |
| "extent[%llu %u] is referred by other roots than %llu", |
| key.objectid, nodesize, root->objectid); |
| err = BACKREF_MISMATCH; |
| } |
| } |
| |
| /* |
| * Iterate the extent/metadata item to find the exact backref |
| */ |
| item_size = btrfs_item_size_nr(leaf, slot); |
| ptr = (unsigned long)iref; |
| end = (unsigned long)ei + item_size; |
| while (ptr < end) { |
| iref = (struct btrfs_extent_inline_ref *)ptr; |
| type = btrfs_extent_inline_ref_type(leaf, iref); |
| offset = btrfs_extent_inline_ref_offset(leaf, iref); |
| |
| if (type == BTRFS_TREE_BLOCK_REF_KEY && |
| (offset == root->objectid || offset == owner)) { |
| found_ref = 1; |
| } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| /* |
| * Backref of tree reloc root points to itself, no need |
| * to check backref any more. |
| */ |
| if (tree_reloc_root) |
| found_ref = 1; |
| else |
| /* Check if the backref points to valid referencer */ |
| found_ref = !check_tree_block_ref(root, NULL, |
| offset, level + 1, owner); |
| } |
| |
| if (found_ref) |
| break; |
| ptr += btrfs_extent_inline_ref_size(type); |
| } |
| |
| /* |
| * Inlined extent item doesn't have what we need, check |
| * TREE_BLOCK_REF_KEY |
| */ |
| if (!found_ref) { |
| btrfs_release_path(&path); |
| key.objectid = bytenr; |
| key.type = BTRFS_TREE_BLOCK_REF_KEY; |
| key.offset = root->objectid; |
| |
| ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); |
| if (!ret) |
| found_ref = 1; |
| } |
| if (!found_ref) |
| err |= BACKREF_MISSING; |
| out: |
| btrfs_release_path(&path); |
| if (eb && (err & BACKREF_MISSING)) |
| error("extent[%llu %u] backref lost (owner: %llu, level: %u)", |
| bytenr, nodesize, owner, level); |
| return err; |
| } |
| |
| /* |
| * Check EXTENT_DATA item, mainly for its dbackref in extent tree |
| * |
| * Return >0 any error found and output error message |
| * Return 0 for no error found |
| */ |
| static int check_extent_data_item(struct btrfs_root *root, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_file_extent_item *fi; |
| struct btrfs_path path; |
| struct btrfs_root *extent_root = root->fs_info->extent_root; |
| struct btrfs_key fi_key; |
| struct btrfs_key dbref_key; |
| struct extent_buffer *leaf; |
| struct btrfs_extent_item *ei; |
| struct btrfs_extent_inline_ref *iref; |
| struct btrfs_extent_data_ref *dref; |
| u64 owner; |
| u64 disk_bytenr; |
| u64 disk_num_bytes; |
| u64 extent_num_bytes; |
| u64 extent_flags; |
| u32 item_size; |
| unsigned long end; |
| unsigned long ptr; |
| int type; |
| u64 ref_root; |
| int found_dbackref = 0; |
| int err = 0; |
| int ret; |
| |
| btrfs_item_key_to_cpu(eb, &fi_key, slot); |
| fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); |
| |
| /* Nothing to check for hole and inline data extents */ |
| if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE || |
| btrfs_file_extent_disk_bytenr(eb, fi) == 0) |
| return 0; |
| |
| disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi); |
| disk_num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); |
| extent_num_bytes = btrfs_file_extent_num_bytes(eb, fi); |
| |
| /* Check unaligned disk_num_bytes and num_bytes */ |
| if (!IS_ALIGNED(disk_num_bytes, root->sectorsize)) { |
| error( |
| "file extent [%llu, %llu] has unaligned disk num bytes: %llu, should be aligned to %u", |
| fi_key.objectid, fi_key.offset, disk_num_bytes, |
| root->sectorsize); |
| err |= BYTES_UNALIGNED; |
| } else { |
| data_bytes_allocated += disk_num_bytes; |
| } |
| if (!IS_ALIGNED(extent_num_bytes, root->sectorsize)) { |
| error( |
| "file extent [%llu, %llu] has unaligned num bytes: %llu, should be aligned to %u", |
| fi_key.objectid, fi_key.offset, extent_num_bytes, |
| root->sectorsize); |
| err |= BYTES_UNALIGNED; |
| } else { |
| data_bytes_referenced += extent_num_bytes; |
| } |
| owner = btrfs_header_owner(eb); |
| |
| /* Check the extent item of the file extent in extent tree */ |
| btrfs_init_path(&path); |
| dbref_key.objectid = btrfs_file_extent_disk_bytenr(eb, fi); |
| dbref_key.type = BTRFS_EXTENT_ITEM_KEY; |
| dbref_key.offset = btrfs_file_extent_disk_num_bytes(eb, fi); |
| |
| ret = btrfs_search_slot(NULL, extent_root, &dbref_key, &path, 0, 0); |
| if (ret) |
| goto out; |
| |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); |
| |
| extent_flags = btrfs_extent_flags(leaf, ei); |
| |
| if (!(extent_flags & BTRFS_EXTENT_FLAG_DATA)) { |
| error( |
| "extent[%llu %llu] backref type mismatch, wanted bit: %llx", |
| disk_bytenr, disk_num_bytes, |
| BTRFS_EXTENT_FLAG_DATA); |
| err |= BACKREF_MISMATCH; |
| } |
| |
| /* Check data backref inside that extent item */ |
| item_size = btrfs_item_size_nr(leaf, path.slots[0]); |
| iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| ptr = (unsigned long)iref; |
| end = (unsigned long)ei + item_size; |
| while (ptr < end) { |
| iref = (struct btrfs_extent_inline_ref *)ptr; |
| type = btrfs_extent_inline_ref_type(leaf, iref); |
| dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| |
| if (type == BTRFS_EXTENT_DATA_REF_KEY) { |
| ref_root = btrfs_extent_data_ref_root(leaf, dref); |
| if (ref_root == owner || ref_root == root->objectid) |
| found_dbackref = 1; |
| } else if (type == BTRFS_SHARED_DATA_REF_KEY) { |
| found_dbackref = !check_tree_block_ref(root, NULL, |
| btrfs_extent_inline_ref_offset(leaf, iref), |
| 0, owner); |
| } |
| |
| if (found_dbackref) |
| break; |
| ptr += btrfs_extent_inline_ref_size(type); |
| } |
| |
| if (!found_dbackref) { |
| btrfs_release_path(&path); |
| |
| /* Didn't find inlined data backref, try EXTENT_DATA_REF_KEY */ |
| dbref_key.objectid = btrfs_file_extent_disk_bytenr(eb, fi); |
| dbref_key.type = BTRFS_EXTENT_DATA_REF_KEY; |
| dbref_key.offset = hash_extent_data_ref(root->objectid, |
| fi_key.objectid, fi_key.offset); |
| |
| ret = btrfs_search_slot(NULL, root->fs_info->extent_root, |
| &dbref_key, &path, 0, 0); |
| if (!ret) { |
| found_dbackref = 1; |
| goto out; |
| } |
| |
| btrfs_release_path(&path); |
| |
| /* |
| * Neither inlined nor EXTENT_DATA_REF found, try |
| * SHARED_DATA_REF as last chance. |
| */ |
| dbref_key.objectid = disk_bytenr; |
| dbref_key.type = BTRFS_SHARED_DATA_REF_KEY; |
| dbref_key.offset = eb->start; |
| |
| ret = btrfs_search_slot(NULL, root->fs_info->extent_root, |
| &dbref_key, &path, 0, 0); |
| if (!ret) { |
| found_dbackref = 1; |
| goto out; |
| } |
| } |
| |
| out: |
| if (!found_dbackref) |
| err |= BACKREF_MISSING; |
| btrfs_release_path(&path); |
| if (err & BACKREF_MISSING) { |
| error("data extent[%llu %llu] backref lost", |
| disk_bytenr, disk_num_bytes); |
| } |
| return err; |
| } |
| |
| /* |
| * Get real tree block level for the case like shared block |
| * Return >= 0 as tree level |
| * Return <0 for error |
| */ |
| static int query_tree_block_level(struct btrfs_fs_info *fs_info, u64 bytenr) |
| { |
| struct extent_buffer *eb; |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_extent_item *ei; |
| u64 flags; |
| u64 transid; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| u8 backref_level; |
| u8 header_level; |
| int ret; |
| |
| /* Search extent tree for extent generation and level */ |
| key.objectid = bytenr; |
| key.type = BTRFS_METADATA_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto release_out; |
| ret = btrfs_previous_extent_item(fs_info->extent_root, &path, bytenr); |
| if (ret < 0) |
| goto release_out; |
| if (ret > 0) { |
| ret = -ENOENT; |
| goto release_out; |
| } |
| |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| ei = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_extent_item); |
| flags = btrfs_extent_flags(path.nodes[0], ei); |
| if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { |
| ret = -ENOENT; |
| goto release_out; |
| } |
| |
| /* Get transid for later read_tree_block() check */ |
| transid = btrfs_extent_generation(path.nodes[0], ei); |
| |
| /* Get backref level as one source */ |
| if (key.type == BTRFS_METADATA_ITEM_KEY) { |
| backref_level = key.offset; |
| } else { |
| struct btrfs_tree_block_info *info; |
| |
| info = (struct btrfs_tree_block_info *)(ei + 1); |
| backref_level = btrfs_tree_block_level(path.nodes[0], info); |
| } |
| btrfs_release_path(&path); |
| |
| /* Get level from tree block as an alternative source */ |
| eb = read_tree_block_fs_info(fs_info, bytenr, nodesize, transid); |
| if (!extent_buffer_uptodate(eb)) { |
| free_extent_buffer(eb); |
| return -EIO; |
| } |
| header_level = btrfs_header_level(eb); |
| free_extent_buffer(eb); |
| |
| if (header_level != backref_level) |
| return -EIO; |
| return header_level; |
| |
| release_out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * Check if a tree block backref is valid (points to a valid tree block) |
| * if level == -1, level will be resolved |
| * Return >0 for any error found and print error message |
| */ |
| static int check_tree_block_backref(struct btrfs_fs_info *fs_info, u64 root_id, |
| u64 bytenr, int level) |
| { |
| struct btrfs_root *root; |
| struct btrfs_key key; |
| struct btrfs_path path; |
| struct extent_buffer *eb; |
| struct extent_buffer *node; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| int err = 0; |
| int ret; |
| |
| /* Query level for level == -1 special case */ |
| if (level == -1) |
| level = query_tree_block_level(fs_info, bytenr); |
| if (level < 0) { |
| err |= REFERENCER_MISSING; |
| goto out; |
| } |
| |
| key.objectid = root_id; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| root = btrfs_read_fs_root(fs_info, &key); |
| if (IS_ERR(root)) { |
| err |= REFERENCER_MISSING; |
| goto out; |
| } |
| |
| /* Read out the tree block to get item/node key */ |
| eb = read_tree_block(root, bytenr, root->nodesize, 0); |
| if (!extent_buffer_uptodate(eb)) { |
| err |= REFERENCER_MISSING; |
| free_extent_buffer(eb); |
| goto out; |
| } |
| |
| /* Empty tree, no need to check key */ |
| if (!btrfs_header_nritems(eb) && !level) { |
| free_extent_buffer(eb); |
| goto out; |
| } |
| |
| if (level) |
| btrfs_node_key_to_cpu(eb, &key, 0); |
| else |
| btrfs_item_key_to_cpu(eb, &key, 0); |
| |
| free_extent_buffer(eb); |
| |
| btrfs_init_path(&path); |
| path.lowest_level = level; |
| /* Search with the first key, to ensure we can reach it */ |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) { |
| err |= REFERENCER_MISSING; |
| goto release_out; |
| } |
| |
| node = path.nodes[level]; |
| if (btrfs_header_bytenr(node) != bytenr) { |
| error( |
| "extent [%llu %d] referencer bytenr mismatch, wanted: %llu, have: %llu", |
| bytenr, nodesize, bytenr, |
| btrfs_header_bytenr(node)); |
| err |= REFERENCER_MISMATCH; |
| } |
| if (btrfs_header_level(node) != level) { |
| error( |
| "extent [%llu %d] referencer level mismatch, wanted: %d, have: %d", |
| bytenr, nodesize, level, |
| btrfs_header_level(node)); |
| err |= REFERENCER_MISMATCH; |
| } |
| |
| release_out: |
| btrfs_release_path(&path); |
| out: |
| if (err & REFERENCER_MISSING) { |
| if (level < 0) |
| error("extent [%llu %d] lost referencer (owner: %llu)", |
| bytenr, nodesize, root_id); |
| else |
| error( |
| "extent [%llu %d] lost referencer (owner: %llu, level: %u)", |
| bytenr, nodesize, root_id, level); |
| } |
| |
| return err; |
| } |
| |
| /* |
| * Check if tree block @eb is tree reloc root. |
| * Return 0 if it's not or any problem happens |
| * Return 1 if it's a tree reloc root |
| */ |
| static int is_tree_reloc_root(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb) |
| { |
| struct btrfs_root *tree_reloc_root; |
| struct btrfs_key key; |
| u64 bytenr = btrfs_header_bytenr(eb); |
| u64 owner = btrfs_header_owner(eb); |
| int ret = 0; |
| |
| key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| key.offset = owner; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| |
| tree_reloc_root = btrfs_read_fs_root_no_cache(fs_info, &key); |
| if (IS_ERR(tree_reloc_root)) |
| return 0; |
| |
| if (bytenr == btrfs_header_bytenr(tree_reloc_root->node)) |
| ret = 1; |
| btrfs_free_fs_root(tree_reloc_root); |
| return ret; |
| } |
| |
| /* |
| * Check referencer for shared block backref |
| * If level == -1, this function will resolve the level. |
| */ |
| static int check_shared_block_backref(struct btrfs_fs_info *fs_info, |
| u64 parent, u64 bytenr, int level) |
| { |
| struct extent_buffer *eb; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| u32 nr; |
| int found_parent = 0; |
| int i; |
| |
| eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0); |
| if (!extent_buffer_uptodate(eb)) |
| goto out; |
| |
| if (level == -1) |
| level = query_tree_block_level(fs_info, bytenr); |
| if (level < 0) |
| goto out; |
| |
| /* It's possible it's a tree reloc root */ |
| if (parent == bytenr) { |
| if (is_tree_reloc_root(fs_info, eb)) |
| found_parent = 1; |
| goto out; |
| } |
| |
| if (level + 1 != btrfs_header_level(eb)) |
| goto out; |
| |
| nr = btrfs_header_nritems(eb); |
| for (i = 0; i < nr; i++) { |
| if (bytenr == btrfs_node_blockptr(eb, i)) { |
| found_parent = 1; |
| break; |
| } |
| } |
| out: |
| free_extent_buffer(eb); |
| if (!found_parent) { |
| error( |
| "shared extent[%llu %u] lost its parent (parent: %llu, level: %u)", |
| bytenr, nodesize, parent, level); |
| return REFERENCER_MISSING; |
| } |
| return 0; |
| } |
| |
| /* |
| * Check referencer for normal (inlined) data ref |
| * If len == 0, it will be resolved by searching in extent tree |
| */ |
| static int check_extent_data_backref(struct btrfs_fs_info *fs_info, |
| u64 root_id, u64 objectid, u64 offset, |
| u64 bytenr, u64 len, u32 count) |
| { |
| struct btrfs_root *root; |
| struct btrfs_root *extent_root = fs_info->extent_root; |
| struct btrfs_key key; |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_file_extent_item *fi; |
| u32 found_count = 0; |
| int slot; |
| int ret = 0; |
| |
| if (!len) { |
| key.objectid = bytenr; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| ret = btrfs_previous_extent_item(extent_root, &path, bytenr); |
| if (ret) |
| goto out; |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| if (key.objectid != bytenr || |
| key.type != BTRFS_EXTENT_ITEM_KEY) |
| goto out; |
| len = key.offset; |
| btrfs_release_path(&path); |
| } |
| key.objectid = root_id; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| btrfs_init_path(&path); |
| |
| root = btrfs_read_fs_root(fs_info, &key); |
| if (IS_ERR(root)) |
| goto out; |
| |
| key.objectid = objectid; |
| key.type = BTRFS_EXTENT_DATA_KEY; |
| /* |
| * It can be nasty as data backref offset is |
| * file offset - file extent offset, which is smaller or |
| * equal to original backref offset. The only special case is |
| * overflow. So we need to special check and do further search. |
| */ |
| key.offset = offset & (1ULL << 63) ? 0 : offset; |
| |
| ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| /* |
| * Search afterwards to get correct one |
| * NOTE: As we must do a comprehensive check on the data backref to |
| * make sure the dref count also matches, we must iterate all file |
| * extents for that inode. |
| */ |
| while (1) { |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| |
| if (slot >= btrfs_header_nritems(leaf)) |
| goto next; |
| btrfs_item_key_to_cpu(leaf, &key, slot); |
| if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) |
| break; |
| fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| /* |
| * Except normal disk bytenr and disk num bytes, we still |
| * need to do extra check on dbackref offset as |
| * dbackref offset = file_offset - file_extent_offset |
| */ |
| if (btrfs_file_extent_disk_bytenr(leaf, fi) == bytenr && |
| btrfs_file_extent_disk_num_bytes(leaf, fi) == len && |
| (u64)(key.offset - btrfs_file_extent_offset(leaf, fi)) == |
| offset) |
| found_count++; |
| |
| next: |
| ret = btrfs_next_item(root, &path); |
| if (ret) |
| break; |
| } |
| out: |
| btrfs_release_path(&path); |
| if (found_count != count) { |
| error( |
| "extent[%llu, %llu] referencer count mismatch (root: %llu, owner: %llu, offset: %llu) wanted: %u, have: %u", |
| bytenr, len, root_id, objectid, offset, count, found_count); |
| return REFERENCER_MISSING; |
| } |
| return 0; |
| } |
| |
| /* |
| * Check if the referencer of a shared data backref exists |
| */ |
| static int check_shared_data_backref(struct btrfs_fs_info *fs_info, |
| u64 parent, u64 bytenr) |
| { |
| struct extent_buffer *eb; |
| struct btrfs_key key; |
| struct btrfs_file_extent_item *fi; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| u32 nr; |
| int found_parent = 0; |
| int i; |
| |
| eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0); |
| if (!extent_buffer_uptodate(eb)) |
| goto out; |
| |
| nr = btrfs_header_nritems(eb); |
| for (i = 0; i < nr; i++) { |
| btrfs_item_key_to_cpu(eb, &key, i); |
| if (key.type != BTRFS_EXTENT_DATA_KEY) |
| continue; |
| |
| fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); |
| if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE) |
| continue; |
| |
| if (btrfs_file_extent_disk_bytenr(eb, fi) == bytenr) { |
| found_parent = 1; |
| break; |
| } |
| } |
| |
| out: |
| free_extent_buffer(eb); |
| if (!found_parent) { |
| error("shared extent %llu referencer lost (parent: %llu)", |
| bytenr, parent); |
| return REFERENCER_MISSING; |
| } |
| return 0; |
| } |
| |
| /* |
| * This function will check a given extent item, including its backref and |
| * itself (like crossing stripe boundary and type) |
| * |
| * Since we don't use extent_record anymore, introduce new error bit |
| */ |
| static int check_extent_item(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_extent_item *ei; |
| struct btrfs_extent_inline_ref *iref; |
| struct btrfs_extent_data_ref *dref; |
| unsigned long end; |
| unsigned long ptr; |
| int type; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| u32 item_size = btrfs_item_size_nr(eb, slot); |
| u64 flags; |
| u64 offset; |
| int metadata = 0; |
| int level; |
| struct btrfs_key key; |
| int ret; |
| int err = 0; |
| |
| btrfs_item_key_to_cpu(eb, &key, slot); |
| if (key.type == BTRFS_EXTENT_ITEM_KEY) |
| bytes_used += key.offset; |
| else |
| bytes_used += nodesize; |
| |
| if (item_size < sizeof(*ei)) { |
| /* |
| * COMPAT_EXTENT_TREE_V0 case, but it's already a super |
| * old thing when on disk format is still un-determined. |
| * No need to care about it anymore |
| */ |
| error("unsupported COMPAT_EXTENT_TREE_V0 detected"); |
| return -ENOTTY; |
| } |
| |
| ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); |
| flags = btrfs_extent_flags(eb, ei); |
| |
| if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) |
| metadata = 1; |
| if (metadata && check_crossing_stripes(global_info, key.objectid, |
| eb->len)) { |
| error("bad metadata [%llu, %llu) crossing stripe boundary", |
| key.objectid, key.objectid + nodesize); |
| err |= CROSSING_STRIPE_BOUNDARY; |
| } |
| |
| ptr = (unsigned long)(ei + 1); |
| |
| if (metadata && key.type == BTRFS_EXTENT_ITEM_KEY) { |
| /* Old EXTENT_ITEM metadata */ |
| struct btrfs_tree_block_info *info; |
| |
| info = (struct btrfs_tree_block_info *)ptr; |
| level = btrfs_tree_block_level(eb, info); |
| ptr += sizeof(struct btrfs_tree_block_info); |
| } else { |
| /* New METADATA_ITEM */ |
| level = key.offset; |
| } |
| end = (unsigned long)ei + item_size; |
| |
| next: |
| /* Reached extent item end normally */ |
| if (ptr == end) |
| goto out; |
| |
| /* Beyond extent item end, wrong item size */ |
| if (ptr > end) { |
| err |= ITEM_SIZE_MISMATCH; |
| error("extent item at bytenr %llu slot %d has wrong size", |
| eb->start, slot); |
| goto out; |
| } |
| |
| /* Now check every backref in this extent item */ |
| iref = (struct btrfs_extent_inline_ref *)ptr; |
| type = btrfs_extent_inline_ref_type(eb, iref); |
| offset = btrfs_extent_inline_ref_offset(eb, iref); |
| switch (type) { |
| case BTRFS_TREE_BLOCK_REF_KEY: |
| ret = check_tree_block_backref(fs_info, offset, key.objectid, |
| level); |
| err |= ret; |
| break; |
| case BTRFS_SHARED_BLOCK_REF_KEY: |
| ret = check_shared_block_backref(fs_info, offset, key.objectid, |
| level); |
| err |= ret; |
| break; |
| case BTRFS_EXTENT_DATA_REF_KEY: |
| dref = (struct btrfs_extent_data_ref *)(&iref->offset); |
| ret = check_extent_data_backref(fs_info, |
| btrfs_extent_data_ref_root(eb, dref), |
| btrfs_extent_data_ref_objectid(eb, dref), |
| btrfs_extent_data_ref_offset(eb, dref), |
| key.objectid, key.offset, |
| btrfs_extent_data_ref_count(eb, dref)); |
| err |= ret; |
| break; |
| case BTRFS_SHARED_DATA_REF_KEY: |
| ret = check_shared_data_backref(fs_info, offset, key.objectid); |
| err |= ret; |
| break; |
| default: |
| error("extent[%llu %d %llu] has unknown ref type: %d", |
| key.objectid, key.type, key.offset, type); |
| err |= UNKNOWN_TYPE; |
| goto out; |
| } |
| |
| ptr += btrfs_extent_inline_ref_size(type); |
| goto next; |
| |
| out: |
| return err; |
| } |
| |
| /* |
| * Check if a dev extent item is referred correctly by its chunk |
| */ |
| static int check_dev_extent_item(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_root *chunk_root = fs_info->chunk_root; |
| struct btrfs_dev_extent *ptr; |
| struct btrfs_path path; |
| struct btrfs_key chunk_key; |
| struct btrfs_key devext_key; |
| struct btrfs_chunk *chunk; |
| struct extent_buffer *l; |
| int num_stripes; |
| u64 length; |
| int i; |
| int found_chunk = 0; |
| int ret; |
| |
| btrfs_item_key_to_cpu(eb, &devext_key, slot); |
| ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_extent); |
| length = btrfs_dev_extent_length(eb, ptr); |
| |
| chunk_key.objectid = btrfs_dev_extent_chunk_objectid(eb, ptr); |
| chunk_key.type = BTRFS_CHUNK_ITEM_KEY; |
| chunk_key.offset = btrfs_dev_extent_chunk_offset(eb, ptr); |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, chunk_root, &chunk_key, &path, 0, 0); |
| if (ret) |
| goto out; |
| |
| l = path.nodes[0]; |
| chunk = btrfs_item_ptr(l, path.slots[0], struct btrfs_chunk); |
| if (btrfs_chunk_length(l, chunk) != length) |
| goto out; |
| |
| num_stripes = btrfs_chunk_num_stripes(l, chunk); |
| for (i = 0; i < num_stripes; i++) { |
| u64 devid = btrfs_stripe_devid_nr(l, chunk, i); |
| u64 offset = btrfs_stripe_offset_nr(l, chunk, i); |
| |
| if (devid == devext_key.objectid && |
| offset == devext_key.offset) { |
| found_chunk = 1; |
| break; |
| } |
| } |
| out: |
| btrfs_release_path(&path); |
| if (!found_chunk) { |
| error( |
| "device extent[%llu, %llu, %llu] did not find the related chunk", |
| devext_key.objectid, devext_key.offset, length); |
| return REFERENCER_MISSING; |
| } |
| return 0; |
| } |
| |
| /* |
| * Check if the used space is correct with the dev item |
| */ |
| static int check_dev_item(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_root *dev_root = fs_info->dev_root; |
| struct btrfs_dev_item *dev_item; |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_dev_extent *ptr; |
| u64 dev_id; |
| u64 used; |
| u64 total = 0; |
| int ret; |
| |
| dev_item = btrfs_item_ptr(eb, slot, struct btrfs_dev_item); |
| dev_id = btrfs_device_id(eb, dev_item); |
| used = btrfs_device_bytes_used(eb, dev_item); |
| |
| key.objectid = dev_id; |
| key.type = BTRFS_DEV_EXTENT_KEY; |
| key.offset = 0; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| btrfs_item_key_to_cpu(eb, &key, slot); |
| error("cannot find any related dev extent for dev[%llu, %u, %llu]", |
| key.objectid, key.type, key.offset); |
| btrfs_release_path(&path); |
| return REFERENCER_MISSING; |
| } |
| |
| /* Iterate dev_extents to calculate the used space of a device */ |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) |
| goto next; |
| |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| if (key.objectid > dev_id) |
| break; |
| if (key.type != BTRFS_DEV_EXTENT_KEY || key.objectid != dev_id) |
| goto next; |
| |
| ptr = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_dev_extent); |
| total += btrfs_dev_extent_length(path.nodes[0], ptr); |
| next: |
| ret = btrfs_next_item(dev_root, &path); |
| if (ret) |
| break; |
| } |
| btrfs_release_path(&path); |
| |
| if (used != total) { |
| btrfs_item_key_to_cpu(eb, &key, slot); |
| error( |
| "Dev extent's total-byte %llu is not equal to bytes-used %llu in dev[%llu, %u, %llu]", |
| total, used, BTRFS_ROOT_TREE_OBJECTID, |
| BTRFS_DEV_EXTENT_KEY, dev_id); |
| return ACCOUNTING_MISMATCH; |
| } |
| return 0; |
| } |
| |
| /* |
| * Check a block group item with its referener (chunk) and its used space |
| * with extent/metadata item |
| */ |
| static int check_block_group_item(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_root *extent_root = fs_info->extent_root; |
| struct btrfs_root *chunk_root = fs_info->chunk_root; |
| struct btrfs_block_group_item *bi; |
| struct btrfs_block_group_item bg_item; |
| struct btrfs_path path; |
| struct btrfs_key bg_key; |
| struct btrfs_key chunk_key; |
| struct btrfs_key extent_key; |
| struct btrfs_chunk *chunk; |
| struct extent_buffer *leaf; |
| struct btrfs_extent_item *ei; |
| u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| u64 flags; |
| u64 bg_flags; |
| u64 used; |
| u64 total = 0; |
| int ret; |
| int err = 0; |
| |
| btrfs_item_key_to_cpu(eb, &bg_key, slot); |
| bi = btrfs_item_ptr(eb, slot, struct btrfs_block_group_item); |
| read_extent_buffer(eb, &bg_item, (unsigned long)bi, sizeof(bg_item)); |
| used = btrfs_block_group_used(&bg_item); |
| bg_flags = btrfs_block_group_flags(&bg_item); |
| |
| chunk_key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; |
| chunk_key.type = BTRFS_CHUNK_ITEM_KEY; |
| chunk_key.offset = bg_key.objectid; |
| |
| btrfs_init_path(&path); |
| /* Search for the referencer chunk */ |
| ret = btrfs_search_slot(NULL, chunk_root, &chunk_key, &path, 0, 0); |
| if (ret) { |
| error( |
| "block group[%llu %llu] did not find the related chunk item", |
| bg_key.objectid, bg_key.offset); |
| err |= REFERENCER_MISSING; |
| } else { |
| chunk = btrfs_item_ptr(path.nodes[0], path.slots[0], |
| struct btrfs_chunk); |
| if (btrfs_chunk_length(path.nodes[0], chunk) != |
| bg_key.offset) { |
| error( |
| "block group[%llu %llu] related chunk item length does not match", |
| bg_key.objectid, bg_key.offset); |
| err |= REFERENCER_MISMATCH; |
| } |
| } |
| btrfs_release_path(&path); |
| |
| /* Search from the block group bytenr */ |
| extent_key.objectid = bg_key.objectid; |
| extent_key.type = 0; |
| extent_key.offset = 0; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, extent_root, &extent_key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| |
| /* Iterate extent tree to account used space */ |
| while (1) { |
| leaf = path.nodes[0]; |
| |
| /* Search slot can point to the last item beyond leaf nritems */ |
| if (path.slots[0] >= btrfs_header_nritems(leaf)) |
| goto next; |
| |
| btrfs_item_key_to_cpu(leaf, &extent_key, path.slots[0]); |
| if (extent_key.objectid >= bg_key.objectid + bg_key.offset) |
| break; |
| |
| if (extent_key.type != BTRFS_METADATA_ITEM_KEY && |
| extent_key.type != BTRFS_EXTENT_ITEM_KEY) |
| goto next; |
| if (extent_key.objectid < bg_key.objectid) |
| goto next; |
| |
| if (extent_key.type == BTRFS_METADATA_ITEM_KEY) |
| total += nodesize; |
| else |
| total += extent_key.offset; |
| |
| ei = btrfs_item_ptr(leaf, path.slots[0], |
| struct btrfs_extent_item); |
| flags = btrfs_extent_flags(leaf, ei); |
| if (flags & BTRFS_EXTENT_FLAG_DATA) { |
| if (!(bg_flags & BTRFS_BLOCK_GROUP_DATA)) { |
| error( |
| "bad extent[%llu, %llu) type mismatch with chunk", |
| extent_key.objectid, |
| extent_key.objectid + extent_key.offset); |
| err |= CHUNK_TYPE_MISMATCH; |
| } |
| } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { |
| if (!(bg_flags & (BTRFS_BLOCK_GROUP_SYSTEM | |
| BTRFS_BLOCK_GROUP_METADATA))) { |
| error( |
| "bad extent[%llu, %llu) type mismatch with chunk", |
| extent_key.objectid, |
| extent_key.objectid + nodesize); |
| err |= CHUNK_TYPE_MISMATCH; |
| } |
| } |
| next: |
| ret = btrfs_next_item(extent_root, &path); |
| if (ret) |
| break; |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| |
| if (total != used) { |
| error( |
| "block group[%llu %llu] used %llu but extent items used %llu", |
| bg_key.objectid, bg_key.offset, used, total); |
| err |= ACCOUNTING_MISMATCH; |
| } |
| return err; |
| } |
| |
| /* |
| * Check a chunk item. |
| * Including checking all referred dev_extents and block group |
| */ |
| static int check_chunk_item(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int slot) |
| { |
| struct btrfs_root *extent_root = fs_info->extent_root; |
| struct btrfs_root *dev_root = fs_info->dev_root; |
| struct btrfs_path path; |
| struct btrfs_key chunk_key; |
| struct btrfs_key bg_key; |
| struct btrfs_key devext_key; |
| struct btrfs_chunk *chunk; |
| struct extent_buffer *leaf; |
| struct btrfs_block_group_item *bi; |
| struct btrfs_block_group_item bg_item; |
| struct btrfs_dev_extent *ptr; |
| u32 sectorsize = btrfs_super_sectorsize(fs_info->super_copy); |
| u64 length; |
| u64 chunk_end; |
| u64 type; |
| u64 profile; |
| int num_stripes; |
| u64 offset; |
| u64 objectid; |
| int i; |
| int ret; |
| int err = 0; |
| |
| btrfs_item_key_to_cpu(eb, &chunk_key, slot); |
| chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk); |
| length = btrfs_chunk_length(eb, chunk); |
| chunk_end = chunk_key.offset + length; |
| if (!IS_ALIGNED(length, sectorsize)) { |
| error("chunk[%llu %llu) not aligned to %u", |
| chunk_key.offset, chunk_end, sectorsize); |
| err |= BYTES_UNALIGNED; |
| goto out; |
| } |
| |
| type = btrfs_chunk_type(eb, chunk); |
| profile = type & BTRFS_BLOCK_GROUP_PROFILE_MASK; |
| if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) { |
| error("chunk[%llu %llu) has no chunk type", |
| chunk_key.offset, chunk_end); |
| err |= UNKNOWN_TYPE; |
| } |
| if (profile && (profile & (profile - 1))) { |
| error("chunk[%llu %llu) multiple profiles detected: %llx", |
| chunk_key.offset, chunk_end, profile); |
| err |= UNKNOWN_TYPE; |
| } |
| |
| bg_key.objectid = chunk_key.offset; |
| bg_key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
| bg_key.offset = length; |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(NULL, extent_root, &bg_key, &path, 0, 0); |
| if (ret) { |
| error( |
| "chunk[%llu %llu) did not find the related block group item", |
| chunk_key.offset, chunk_end); |
| err |= REFERENCER_MISSING; |
| } else{ |
| leaf = path.nodes[0]; |
| bi = btrfs_item_ptr(leaf, path.slots[0], |
| struct btrfs_block_group_item); |
| read_extent_buffer(leaf, &bg_item, (unsigned long)bi, |
| sizeof(bg_item)); |
| if (btrfs_block_group_flags(&bg_item) != type) { |
| error( |
| "chunk[%llu %llu) related block group item flags mismatch, wanted: %llu, have: %llu", |
| chunk_key.offset, chunk_end, type, |
| btrfs_block_group_flags(&bg_item)); |
| err |= REFERENCER_MISSING; |
| } |
| } |
| |
| num_stripes = btrfs_chunk_num_stripes(eb, chunk); |
| for (i = 0; i < num_stripes; i++) { |
| btrfs_release_path(&path); |
| btrfs_init_path(&path); |
| devext_key.objectid = btrfs_stripe_devid_nr(eb, chunk, i); |
| devext_key.type = BTRFS_DEV_EXTENT_KEY; |
| devext_key.offset = btrfs_stripe_offset_nr(eb, chunk, i); |
| |
| ret = btrfs_search_slot(NULL, dev_root, &devext_key, &path, |
| 0, 0); |
| if (ret) |
| goto not_match_dev; |
| |
| leaf = path.nodes[0]; |
| ptr = btrfs_item_ptr(leaf, path.slots[0], |
| struct btrfs_dev_extent); |
| objectid = btrfs_dev_extent_chunk_objectid(leaf, ptr); |
| offset = btrfs_dev_extent_chunk_offset(leaf, ptr); |
| if (objectid != chunk_key.objectid || |
| offset != chunk_key.offset || |
| btrfs_dev_extent_length(leaf, ptr) != length) |
| goto not_match_dev; |
| continue; |
| not_match_dev: |
| err |= BACKREF_MISSING; |
| error( |
| "chunk[%llu %llu) stripe %d did not find the related dev extent", |
| chunk_key.objectid, chunk_end, i); |
| continue; |
| } |
| btrfs_release_path(&path); |
| out: |
| return err; |
| } |
| |
| /* |
| * Main entry function to check known items and update related accounting info |
| */ |
| static int check_leaf_items(struct btrfs_root *root, struct extent_buffer *eb) |
| { |
| struct btrfs_fs_info *fs_info = root->fs_info; |
| struct btrfs_key key; |
| int slot = 0; |
| int type; |
| struct btrfs_extent_data_ref *dref; |
| int ret; |
| int err = 0; |
| |
| next: |
| btrfs_item_key_to_cpu(eb, &key, slot); |
| type = key.type; |
| |
| switch (type) { |
| case BTRFS_EXTENT_DATA_KEY: |
| ret = check_extent_data_item(root, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_BLOCK_GROUP_ITEM_KEY: |
| ret = check_block_group_item(fs_info, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_DEV_ITEM_KEY: |
| ret = check_dev_item(fs_info, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_CHUNK_ITEM_KEY: |
| ret = check_chunk_item(fs_info, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_DEV_EXTENT_KEY: |
| ret = check_dev_extent_item(fs_info, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_EXTENT_ITEM_KEY: |
| case BTRFS_METADATA_ITEM_KEY: |
| ret = check_extent_item(fs_info, eb, slot); |
| err |= ret; |
| break; |
| case BTRFS_EXTENT_CSUM_KEY: |
| total_csum_bytes += btrfs_item_size_nr(eb, slot); |
| break; |
| case BTRFS_TREE_BLOCK_REF_KEY: |
| ret = check_tree_block_backref(fs_info, key.offset, |
| key.objectid, -1); |
| err |= ret; |
| break; |
| case BTRFS_EXTENT_DATA_REF_KEY: |
| dref = btrfs_item_ptr(eb, slot, struct btrfs_extent_data_ref); |
| ret = check_extent_data_backref(fs_info, |
| btrfs_extent_data_ref_root(eb, dref), |
| btrfs_extent_data_ref_objectid(eb, dref), |
| btrfs_extent_data_ref_offset(eb, dref), |
| key.objectid, 0, |
| btrfs_extent_data_ref_count(eb, dref)); |
| err |= ret; |
| break; |
| case BTRFS_SHARED_BLOCK_REF_KEY: |
| ret = check_shared_block_backref(fs_info, key.offset, |
| key.objectid, -1); |
| err |= ret; |
| break; |
| case BTRFS_SHARED_DATA_REF_KEY: |
| ret = check_shared_data_backref(fs_info, key.offset, |
| key.objectid); |
| err |= ret; |
| break; |
| default: |
| break; |
| } |
| |
| if (++slot < btrfs_header_nritems(eb)) |
| goto next; |
| |
| return err; |
| } |
| |
| /* |
| * Helper function for later fs/subvol tree check. To determine if a tree |
| * block should be checked. |
| * This function will ensure only the direct referencer with lowest rootid to |
| * check a fs/subvolume tree block. |
| * |
| * Backref check at extent tree would detect errors like missing subvolume |
| * tree, so we can do aggressive check to reduce duplicated checks. |
| */ |
| static int should_check(struct btrfs_root *root, struct extent_buffer *eb) |
| { |
| struct btrfs_root *extent_root = root->fs_info->extent_root; |
| struct btrfs_key key; |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| int slot; |
| struct btrfs_extent_item *ei; |
| unsigned long ptr; |
| unsigned long end; |
| int type; |
| u32 item_size; |
| u64 offset; |
| struct btrfs_extent_inline_ref *iref; |
| int ret; |
| |
| btrfs_init_path(&path); |
| key.objectid = btrfs_header_bytenr(eb); |
| key.type = BTRFS_METADATA_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| /* |
| * Any failure in backref resolving means we can't determine |
| * whom the tree block belongs to. |
| * So in that case, we need to check that tree block |
| */ |
| ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto need_check; |
| |
| ret = btrfs_previous_extent_item(extent_root, &path, |
| btrfs_header_bytenr(eb)); |
| if (ret) |
| goto need_check; |
| |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| btrfs_item_key_to_cpu(leaf, &key, slot); |
| ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); |
| |
| if (key.type == BTRFS_METADATA_ITEM_KEY) { |
| iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| } else { |
| struct btrfs_tree_block_info *info; |
| |
| info = (struct btrfs_tree_block_info *)(ei + 1); |
| iref = (struct btrfs_extent_inline_ref *)(info + 1); |
| } |
| |
| item_size = btrfs_item_size_nr(leaf, slot); |
| ptr = (unsigned long)iref; |
| end = (unsigned long)ei + item_size; |
| while (ptr < end) { |
| iref = (struct btrfs_extent_inline_ref *)ptr; |
| type = btrfs_extent_inline_ref_type(leaf, iref); |
| offset = btrfs_extent_inline_ref_offset(leaf, iref); |
| |
| /* |
| * We only check the tree block if current root is |
| * the lowest referencer of it. |
| */ |
| if (type == BTRFS_TREE_BLOCK_REF_KEY && |
| offset < root->objectid) { |
| btrfs_release_path(&path); |
| return 0; |
| } |
| |
| ptr += btrfs_extent_inline_ref_size(type); |
| } |
| /* |
| * Normally we should also check keyed tree block ref, but that may be |
| * very time consuming. Inlined ref should already make us skip a lot |
| * of refs now. So skip search keyed tree block ref. |
| */ |
| |
| need_check: |
| btrfs_release_path(&path); |
| return 1; |
| } |
| |
| /* |
| * Traversal function for tree block. We will do: |
| * 1) Skip shared fs/subvolume tree blocks |
| * 2) Update related bytes accounting |
| * 3) Pre-order traversal |
| */ |
| static int traverse_tree_block(struct btrfs_root *root, |
| struct extent_buffer *node) |
| { |
| struct extent_buffer *eb; |
| struct btrfs_key key; |
| struct btrfs_key drop_key; |
| int level; |
| u64 nr; |
| int i; |
| int err = 0; |
| int ret; |
| |
| /* |
| * Skip shared fs/subvolume tree block, in that case they will |
| * be checked by referencer with lowest rootid |
| */ |
| if (is_fstree(root->objectid) && !should_check(root, node)) |
| return 0; |
| |
| /* Update bytes accounting */ |
| total_btree_bytes += node->len; |
| if (fs_root_objectid(btrfs_header_owner(node))) |
| total_fs_tree_bytes += node->len; |
| if (btrfs_header_owner(node) == BTRFS_EXTENT_TREE_OBJECTID) |
| total_extent_tree_bytes += node->len; |
| if (!found_old_backref && |
| btrfs_header_owner(node) == BTRFS_TREE_RELOC_OBJECTID && |
| btrfs_header_backref_rev(node) == BTRFS_MIXED_BACKREF_REV && |
| !btrfs_header_flag(node, BTRFS_HEADER_FLAG_RELOC)) |
| found_old_backref = 1; |
| |
| /* pre-order tranversal, check itself first */ |
| level = btrfs_header_level(node); |
| ret = check_tree_block_ref(root, node, btrfs_header_bytenr(node), |
| btrfs_header_level(node), |
| btrfs_header_owner(node)); |
| err |= ret; |
| if (err) |
| error( |
| "check %s failed root %llu bytenr %llu level %d, force continue check", |
| level ? "node":"leaf", root->objectid, |
| btrfs_header_bytenr(node), btrfs_header_level(node)); |
| |
| if (!level) { |
| btree_space_waste += btrfs_leaf_free_space(root, node); |
| ret = check_leaf_items(root, node); |
| err |= ret; |
| return err; |
| } |
| |
| nr = btrfs_header_nritems(node); |
| btrfs_disk_key_to_cpu(&drop_key, &root->root_item.drop_progress); |
| btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) - nr) * |
| sizeof(struct btrfs_key_ptr); |
| |
| /* Then check all its children */ |
| for (i = 0; i < nr; i++) { |
| u64 blocknr = btrfs_node_blockptr(node, i); |
| |
| btrfs_node_key_to_cpu(node, &key, i); |
| if (level == root->root_item.drop_level && |
| is_dropped_key(&key, &drop_key)) |
| continue; |
| |
| /* |
| * As a btrfs tree has most 8 levels (0..7), so it's quite safe |
| * to call the function itself. |
| */ |
| eb = read_tree_block(root, blocknr, root->nodesize, 0); |
| if (extent_buffer_uptodate(eb)) { |
| ret = traverse_tree_block(root, eb); |
| err |= ret; |
| } |
| free_extent_buffer(eb); |
| } |
| |
| return err; |
| } |
| |
| /* |
| * Low memory usage version check_chunks_and_extents. |
| */ |
| static int check_chunks_and_extents_v2(struct btrfs_root *root) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_root *root1; |
| struct btrfs_root *cur_root; |
| int err = 0; |
| int ret; |
| |
| root1 = root->fs_info->chunk_root; |
| ret = traverse_tree_block(root1, root1->node); |
| err |= ret; |
| |
| root1 = root->fs_info->tree_root; |
| ret = traverse_tree_block(root1, root1->node); |
| err |= ret; |
| |
| btrfs_init_path(&path); |
| key.objectid = BTRFS_EXTENT_TREE_OBJECTID; |
| key.offset = 0; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| |
| ret = btrfs_search_slot(NULL, root1, &key, &path, 0, 0); |
| if (ret) { |
| error("cannot find extent treet in tree_root"); |
| goto out; |
| } |
| |
| while (1) { |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| if (key.type != BTRFS_ROOT_ITEM_KEY) |
| goto next; |
| key.offset = (u64)-1; |
| |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| cur_root = btrfs_read_fs_root_no_cache(root->fs_info, |
| &key); |
| else |
| cur_root = btrfs_read_fs_root(root->fs_info, &key); |
| if (IS_ERR(cur_root) || !cur_root) { |
| error("failed to read tree: %lld", key.objectid); |
| goto next; |
| } |
| |
| ret = traverse_tree_block(cur_root, cur_root->node); |
| err |= ret; |
| |
| if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| btrfs_free_fs_root(cur_root); |
| next: |
| ret = btrfs_next_item(root1, &path); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| return err; |
| } |
| |
| static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, int overwrite) |
| { |
| struct extent_buffer *c; |
| struct extent_buffer *old = root->node; |
| int level; |
| int ret; |
| struct btrfs_disk_key disk_key = {0,0,0}; |
| |
| level = 0; |
| |
| if (overwrite) { |
| c = old; |
| extent_buffer_get(c); |
| goto init; |
| } |
| c = btrfs_alloc_free_block(trans, root, |
| root->nodesize, |
| root->root_key.objectid, |
| &disk_key, level, 0, 0); |
| if (IS_ERR(c)) { |
| c = old; |
| extent_buffer_get(c); |
| overwrite = 1; |
| } |
| init: |
| memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header)); |
| btrfs_set_header_level(c, level); |
| btrfs_set_header_bytenr(c, c->start); |
| btrfs_set_header_generation(c, trans->transid); |
| btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV); |
| btrfs_set_header_owner(c, root->root_key.objectid); |
| |
| write_extent_buffer(c, root->fs_info->fsid, |
| btrfs_header_fsid(), BTRFS_FSID_SIZE); |
| |
| write_extent_buffer(c, root->fs_info->chunk_tree_uuid, |
| btrfs_header_chunk_tree_uuid(c), |
| BTRFS_UUID_SIZE); |
| |
| btrfs_mark_buffer_dirty(c); |
| /* |
| * this case can happen in the following case: |
| * |
| * 1.overwrite previous root. |
| * |
| * 2.reinit reloc data root, this is because we skip pin |
| * down reloc data tree before which means we can allocate |
| * same block bytenr here. |
| */ |
| if (old->start == c->start) { |
| btrfs_set_root_generation(&root->root_item, |
| trans->transid); |
| root->root_item.level = btrfs_header_level(root->node); |
| ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| &root->root_key, &root->root_item); |
| if (ret) { |
| free_extent_buffer(c); |
| return ret; |
| } |
| } |
| free_extent_buffer(old); |
| root->node = c; |
| add_root_to_dirty_list(root); |
| return 0; |
| } |
| |
| static int pin_down_tree_blocks(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int tree_root) |
| { |
| struct extent_buffer *tmp; |
| struct btrfs_root_item *ri; |
| struct btrfs_key key; |
| u64 bytenr; |
| u32 nodesize; |
| int level = btrfs_header_level(eb); |
| int nritems; |
| int ret; |
| int i; |
| |
| /* |
| * If we have pinned this block before, don't pin it again. |
| * This can not only avoid forever loop with broken filesystem |
| * but also give us some speedups. |
| */ |
| if (test_range_bit(&fs_info->pinned_extents, eb->start, |
| eb->start + eb->len - 1, EXTENT_DIRTY, 0)) |
| return 0; |
| |
| btrfs_pin_extent(fs_info, eb->start, eb->len); |
| |
| nodesize = btrfs_super_nodesize(fs_info->super_copy); |
| nritems = btrfs_header_nritems(eb); |
| for (i = 0; i < nritems; i++) { |
| if (level == 0) { |
| btrfs_item_key_to_cpu(eb, &key, i); |
| if (key.type != BTRFS_ROOT_ITEM_KEY) |
| continue; |
| /* Skip the extent root and reloc roots */ |
| if (key.objectid == BTRFS_EXTENT_TREE_OBJECTID || |
| key.objectid == BTRFS_TREE_RELOC_OBJECTID || |
| key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| continue; |
| ri = btrfs_item_ptr(eb, i, struct btrfs_root_item); |
| bytenr = btrfs_disk_root_bytenr(eb, ri); |
| |
| /* |
| * If at any point we start needing the real root we |
| * will have to build a stump root for the root we are |
| * in, but for now this doesn't actually use the root so |
| * just pass in extent_root. |
| */ |
| tmp = read_tree_block(fs_info->extent_root, bytenr, |
| nodesize, 0); |
| if (!extent_buffer_uptodate(tmp)) { |
| fprintf(stderr, "Error reading root block\n"); |
| return -EIO; |
| } |
| ret = pin_down_tree_blocks(fs_info, tmp, 0); |
| free_extent_buffer(tmp); |
| if (ret) |
| return ret; |
| } else { |
| bytenr = btrfs_node_blockptr(eb, i); |
| |
| /* If we aren't the tree root don't read the block */ |
| if (level == 1 && !tree_root) { |
| btrfs_pin_extent(fs_info, bytenr, nodesize); |
| continue; |
| } |
| |
| tmp = read_tree_block(fs_info->extent_root, bytenr, |
| nodesize, 0); |
| if (!extent_buffer_uptodate(tmp)) { |
| fprintf(stderr, "Error reading tree block\n"); |
| return -EIO; |
| } |
| ret = pin_down_tree_blocks(fs_info, tmp, tree_root); |
| free_extent_buffer(tmp); |
| if (ret) |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int pin_metadata_blocks(struct btrfs_fs_info *fs_info) |
| { |
| int ret; |
| |
| ret = pin_down_tree_blocks(fs_info, fs_info->chunk_root->node, 0); |
| if (ret) |
| return ret; |
| |
| return pin_down_tree_blocks(fs_info, fs_info->tree_root->node, 1); |
| } |
| |
| static int reset_block_groups(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_block_group_cache *cache; |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_chunk *chunk; |
| struct btrfs_key key; |
| int ret; |
| u64 start; |
| |
| btrfs_init_path(&path); |
| key.objectid = 0; |
| key.type = BTRFS_CHUNK_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| /* |
| * We do this in case the block groups were screwed up and had alloc |
| * bits that aren't actually set on the chunks. This happens with |
| * restored images every time and could happen in real life I guess. |
| */ |
| fs_info->avail_data_alloc_bits = 0; |
| fs_info->avail_metadata_alloc_bits = 0; |
| fs_info->avail_system_alloc_bits = 0; |
| |
| /* First we need to create the in-memory block groups */ |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(fs_info->chunk_root, &path); |
| if (ret < 0) { |
| btrfs_release_path(&path); |
| return ret; |
| } |
| if (ret) { |
| ret = 0; |
| break; |
| } |
| } |
| leaf = path.nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.type != BTRFS_CHUNK_ITEM_KEY) { |
| path.slots[0]++; |
| continue; |
| } |
| |
| chunk = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_chunk); |
| btrfs_add_block_group(fs_info, 0, |
| btrfs_chunk_type(leaf, chunk), |
| key.objectid, key.offset, |
| btrfs_chunk_length(leaf, chunk)); |
| set_extent_dirty(&fs_info->free_space_cache, key.offset, |
| key.offset + btrfs_chunk_length(leaf, chunk)); |
| path.slots[0]++; |
| } |
| start = 0; |
| while (1) { |
| cache = btrfs_lookup_first_block_group(fs_info, start); |
| if (!cache) |
| break; |
| cache->cached = 1; |
| start = cache->key.objectid + cache->key.offset; |
| } |
| |
| btrfs_release_path(&path); |
| return 0; |
| } |
| |
| static int reset_balance(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_root *root = fs_info->tree_root; |
| struct btrfs_path path; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| int del_slot, del_nr = 0; |
| int ret; |
| int found = 0; |
| |
| btrfs_init_path(&path); |
| key.objectid = BTRFS_BALANCE_OBJECTID; |
| key.type = BTRFS_BALANCE_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); |
| if (ret) { |
| if (ret > 0) |
| ret = 0; |
| if (!ret) |
| goto reinit_data_reloc; |
| else |
| goto out; |
| } |
| |
| ret = btrfs_del_item(trans, root, &path); |
| if (ret) |
| goto out; |
| btrfs_release_path(&path); |
| |
| key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); |
| if (ret < 0) |
| goto out; |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| if (!found) |
| break; |
| |
| if (del_nr) { |
| ret = btrfs_del_items(trans, root, &path, |
| del_slot, del_nr); |
| del_nr = 0; |
| if (ret) |
| goto out; |
| } |
| key.offset++; |
| btrfs_release_path(&path); |
| |
| found = 0; |
| ret = btrfs_search_slot(trans, root, &key, &path, |
| -1, 1); |
| if (ret < 0) |
| goto out; |
| continue; |
| } |
| found = 1; |
| leaf = path.nodes[0]; |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.objectid > BTRFS_TREE_RELOC_OBJECTID) |
| break; |
| if (key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
| path.slots[0]++; |
| continue; |
| } |
| if (!del_nr) { |
| del_slot = path.slots[0]; |
| del_nr = 1; |
| } else { |
| del_nr++; |
| } |
| path.slots[0]++; |
| } |
| |
| if (del_nr) { |
| ret = btrfs_del_items(trans, root, &path, del_slot, del_nr); |
| if (ret) |
| goto out; |
| } |
| btrfs_release_path(&path); |
| |
| reinit_data_reloc: |
| key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| root = btrfs_read_fs_root(fs_info, &key); |
| if (IS_ERR(root)) { |
| fprintf(stderr, "Error reading data reloc tree\n"); |
| ret = PTR_ERR(root); |
| goto out; |
| } |
| record_root_in_trans(trans, root); |
| ret = btrfs_fsck_reinit_root(trans, root, 0); |
| if (ret) |
| goto out; |
| ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID); |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int reinit_extent_tree(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info) |
| { |
| u64 start = 0; |
| int ret; |
| |
| /* |
| * The only reason we don't do this is because right now we're just |
| * walking the trees we find and pinning down their bytes, we don't look |
| * at any of the leaves. In order to do mixed groups we'd have to check |
| * the leaves of any fs roots and pin down the bytes for any file |
| * extents we find. Not hard but why do it if we don't have to? |
| */ |
| if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { |
| fprintf(stderr, "We don't support re-initing the extent tree " |
| "for mixed block groups yet, please notify a btrfs " |
| "developer you want to do this so they can add this " |
| "functionality.\n"); |
| return -EINVAL; |
| } |
| |
| /* |
| * first we need to walk all of the trees except the extent tree and pin |
| * down the bytes that are in use so we don't overwrite any existing |
| * metadata. |
| */ |
| ret = pin_metadata_blocks(fs_info); |
| if (ret) { |
| fprintf(stderr, "error pinning down used bytes\n"); |
| return ret; |
| } |
| |
| /* |
| * Need to drop all the block groups since we're going to recreate all |
| * of them again. |
| */ |
| btrfs_free_block_groups(fs_info); |
| ret = reset_block_groups(fs_info); |
| if (ret) { |
| fprintf(stderr, "error resetting the block groups\n"); |
| return ret; |
| } |
| |
| /* Ok we can allocate now, reinit the extent root */ |
| ret = btrfs_fsck_reinit_root(trans, fs_info->extent_root, 0); |
| if (ret) { |
| fprintf(stderr, "extent root initialization failed\n"); |
| /* |
| * When the transaction code is updated we should end the |
| * transaction, but for now progs only knows about commit so |
| * just return an error. |
| */ |
| return ret; |
| } |
| |
| /* |
| * Now we have all the in-memory block groups setup so we can make |
| * allocations properly, and the metadata we care about is safe since we |
| * pinned all of it above. |
| */ |
| while (1) { |
| struct btrfs_block_group_cache *cache; |
| |
| cache = btrfs_lookup_first_block_group(fs_info, start); |
| if (!cache) |
| break; |
| start = cache->key.objectid + cache->key.offset; |
| ret = btrfs_insert_item(trans, fs_info->extent_root, |
| &cache->key, &cache->item, |
| sizeof(cache->item)); |
| if (ret) { |
| fprintf(stderr, "Error adding block group\n"); |
| return ret; |
| } |
| btrfs_extent_post_op(trans, fs_info->extent_root); |
| } |
| |
| ret = reset_balance(trans, fs_info); |
| if (ret) |
| fprintf(stderr, "error resetting the pending balance\n"); |
| |
| return ret; |
| } |
| |
| static int recow_extent_buffer(struct btrfs_root *root, struct extent_buffer *eb) |
| { |
| struct btrfs_path path; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_key key; |
| int ret; |
| |
| printf("Recowing metadata block %llu\n", eb->start); |
| key.objectid = btrfs_header_owner(eb); |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| root = btrfs_read_fs_root(root->fs_info, &key); |
| if (IS_ERR(root)) { |
| fprintf(stderr, "Couldn't find owner root %llu\n", |
| key.objectid); |
| return PTR_ERR(root); |
| } |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| btrfs_init_path(&path); |
| path.lowest_level = btrfs_header_level(eb); |
| if (path.lowest_level) |
| btrfs_node_key_to_cpu(eb, &key, 0); |
| else |
| btrfs_item_key_to_cpu(eb, &key, 0); |
| |
| ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); |
| btrfs_commit_transaction(trans, root); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int delete_bad_item(struct btrfs_root *root, struct bad_item *bad) |
| { |
| struct btrfs_path path; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_key key; |
| int ret; |
| |
| printf("Deleting bad item [%llu,%u,%llu]\n", bad->key.objectid, |
| bad->key.type, bad->key.offset); |
| key.objectid = bad->root_id; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = (u64)-1; |
| |
| root = btrfs_read_fs_root(root->fs_info, &key); |
| if (IS_ERR(root)) { |
| fprintf(stderr, "Couldn't find owner root %llu\n", |
| key.objectid); |
| return PTR_ERR(root); |
| } |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) |
| return PTR_ERR(trans); |
| |
| btrfs_init_path(&path); |
| ret = btrfs_search_slot(trans, root, &bad->key, &path, -1, 1); |
| if (ret) { |
| if (ret > 0) |
| ret = 0; |
| goto out; |
| } |
| ret = btrfs_del_item(trans, root, &path); |
| out: |
| btrfs_commit_transaction(trans, root); |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int zero_log_tree(struct btrfs_root *root) |
| { |
| struct btrfs_trans_handle *trans; |
| int ret; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| return ret; |
| } |
| btrfs_set_super_log_root(root->fs_info->super_copy, 0); |
| btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); |
| ret = btrfs_commit_transaction(trans, root); |
| return ret; |
| } |
| |
| static int populate_csum(struct btrfs_trans_handle *trans, |
| struct btrfs_root *csum_root, char *buf, u64 start, |
| u64 len) |
| { |
| u64 offset = 0; |
| u64 sectorsize; |
| int ret = 0; |
| |
| while (offset < len) { |
| sectorsize = csum_root->sectorsize; |
| ret = read_extent_data(csum_root, buf, start + offset, |
| §orsize, 0); |
| if (ret) |
| break; |
| ret = btrfs_csum_file_block(trans, csum_root, start + len, |
| start + offset, buf, sectorsize); |
| if (ret) |
| break; |
| offset += sectorsize; |
| } |
| return ret; |
| } |
| |
| static int fill_csum_tree_from_one_fs_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *csum_root, |
| struct btrfs_root *cur_root) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct extent_buffer *node; |
| struct btrfs_file_extent_item *fi; |
| char *buf = NULL; |
| u64 start = 0; |
| u64 len = 0; |
| int slot = 0; |
| int ret = 0; |
| |
| buf = malloc(cur_root->fs_info->csum_root->sectorsize); |
| if (!buf) |
| return -ENOMEM; |
| |
| btrfs_init_path(&path); |
| key.objectid = 0; |
| key.offset = 0; |
| key.type = 0; |
| ret = btrfs_search_slot(NULL, cur_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| /* Iterate all regular file extents and fill its csum */ |
| while (1) { |
| btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); |
| |
| if (key.type != BTRFS_EXTENT_DATA_KEY) |
| goto next; |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item); |
| if (btrfs_file_extent_type(node, fi) != BTRFS_FILE_EXTENT_REG) |
| goto next; |
| start = btrfs_file_extent_disk_bytenr(node, fi); |
| len = btrfs_file_extent_disk_num_bytes(node, fi); |
| |
| ret = populate_csum(trans, csum_root, buf, start, len); |
| if (ret == -EEXIST) |
| ret = 0; |
| if (ret < 0) |
| goto out; |
| next: |
| /* |
| * TODO: if next leaf is corrupted, jump to nearest next valid |
| * leaf. |
| */ |
| ret = btrfs_next_item(cur_root, &path); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| free(buf); |
| return ret; |
| } |
| |
| static int fill_csum_tree_from_fs(struct btrfs_trans_handle *trans, |
| struct btrfs_root *csum_root) |
| { |
| struct btrfs_fs_info *fs_info = csum_root->fs_info; |
| struct btrfs_path path; |
| struct btrfs_root *tree_root = fs_info->tree_root; |
| struct btrfs_root *cur_root; |
| struct extent_buffer *node; |
| struct btrfs_key key; |
| int slot = 0; |
| int ret = 0; |
| |
| btrfs_init_path(&path); |
| key.objectid = BTRFS_FS_TREE_OBJECTID; |
| key.offset = 0; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| if (ret > 0) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| while (1) { |
| node = path.nodes[0]; |
| slot = path.slots[0]; |
| btrfs_item_key_to_cpu(node, &key, slot); |
| if (key.objectid > BTRFS_LAST_FREE_OBJECTID) |
| goto out; |
| if (key.type != BTRFS_ROOT_ITEM_KEY) |
| goto next; |
| if (!is_fstree(key.objectid)) |
| goto next; |
| key.offset = (u64)-1; |
| |
| cur_root = btrfs_read_fs_root(fs_info, &key); |
| if (IS_ERR(cur_root) || !cur_root) { |
| fprintf(stderr, "Fail to read fs/subvol tree: %lld\n", |
| key.objectid); |
| goto out; |
| } |
| ret = fill_csum_tree_from_one_fs_root(trans, csum_root, |
| cur_root); |
| if (ret < 0) |
| goto out; |
| next: |
| ret = btrfs_next_item(tree_root, &path); |
| if (ret > 0) { |
| ret = 0; |
| goto out; |
| } |
| if (ret < 0) |
| goto out; |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int fill_csum_tree_from_extent(struct btrfs_trans_handle *trans, |
| struct btrfs_root *csum_root) |
| { |
| struct btrfs_root *extent_root = csum_root->fs_info->extent_root; |
| struct btrfs_path path; |
| struct btrfs_extent_item *ei; |
| struct extent_buffer *leaf; |
| char *buf; |
| struct btrfs_key key; |
| int ret; |
| |
| btrfs_init_path(&path); |
| key.objectid = 0; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); |
| if (ret < 0) { |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| buf = malloc(csum_root->sectorsize); |
| if (!buf) { |
| btrfs_release_path(&path); |
| return -ENOMEM; |
| } |
| |
| while (1) { |
| if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { |
| ret = btrfs_next_leaf(extent_root, &path); |
| if (ret < 0) |
| break; |
| if (ret) { |
| ret = 0; |
| break; |
| } |
| } |
| leaf = path.nodes[0]; |
| |
| btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); |
| if (key.type != BTRFS_EXTENT_ITEM_KEY) { |
| path.slots[0]++; |
| continue; |
| } |
| |
| ei = btrfs_item_ptr(leaf, path.slots[0], |
| struct btrfs_extent_item); |
| if (!(btrfs_extent_flags(leaf, ei) & |
| BTRFS_EXTENT_FLAG_DATA)) { |
| path.slots[0]++; |
| continue; |
| } |
| |
| ret = populate_csum(trans, csum_root, buf, key.objectid, |
| key.offset); |
| if (ret) |
| break; |
| path.slots[0]++; |
| } |
| |
| btrfs_release_path(&path); |
| free(buf); |
| return ret; |
| } |
| |
| /* |
| * Recalculate the csum and put it into the csum tree. |
| * |
| * Extent tree init will wipe out all the extent info, so in that case, we |
| * can't depend on extent tree, but use fs tree. If search_fs_tree is set, we |
| * will use fs/subvol trees to init the csum tree. |
| */ |
| static int fill_csum_tree(struct btrfs_trans_handle *trans, |
| struct btrfs_root *csum_root, |
| int search_fs_tree) |
| { |
| if (search_fs_tree) |
| return fill_csum_tree_from_fs(trans, csum_root); |
| else |
| return fill_csum_tree_from_extent(trans, csum_root); |
| } |
| |
| static void free_roots_info_cache(void) |
| { |
| if (!roots_info_cache) |
| return; |
| |
| while (!cache_tree_empty(roots_info_cache)) { |
| struct cache_extent *entry; |
| struct root_item_info *rii; |
| |
| entry = first_cache_extent(roots_info_cache); |
| if (!entry) |
| break; |
| remove_cache_extent(roots_info_cache, entry); |
| rii = container_of(entry, struct root_item_info, cache_extent); |
| free(rii); |
| } |
| |
| free(roots_info_cache); |
| roots_info_cache = NULL; |
| } |
| |
| static int build_roots_info_cache(struct btrfs_fs_info *info) |
| { |
| int ret = 0; |
| struct btrfs_key key; |
| struct extent_buffer *leaf; |
| struct btrfs_path path; |
| |
| if (!roots_info_cache) { |
| roots_info_cache = malloc(sizeof(*roots_info_cache)); |
| if (!roots_info_cache) |
| return -ENOMEM; |
| cache_tree_init(roots_info_cache); |
| } |
| |
| btrfs_init_path(&path); |
| key.objectid = 0; |
| key.type = BTRFS_EXTENT_ITEM_KEY; |
| key.offset = 0; |
| ret = btrfs_search_slot(NULL, info->extent_root, &key, &path, 0, 0); |
| if (ret < 0) |
| goto out; |
| leaf = path.nodes[0]; |
| |
| while (1) { |
| struct btrfs_key found_key; |
| struct btrfs_extent_item *ei; |
| struct btrfs_extent_inline_ref *iref; |
| int slot = path.slots[0]; |
| int type; |
| u64 flags; |
| u64 root_id; |
| u8 level; |
| struct cache_extent *entry; |
| struct root_item_info *rii; |
| |
| if (slot >= btrfs_header_nritems(leaf)) { |
| ret = btrfs_next_leaf(info->extent_root, &path); |
| if (ret < 0) { |
| break; |
| } else if (ret) { |
| ret = 0; |
| break; |
| } |
| leaf = path.nodes[0]; |
| slot = path.slots[0]; |
| } |
| |
| btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); |
| |
| if (found_key.type != BTRFS_EXTENT_ITEM_KEY && |
| found_key.type != BTRFS_METADATA_ITEM_KEY) |
| goto next; |
| |
| ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); |
| flags = btrfs_extent_flags(leaf, ei); |
| |
| if (found_key.type == BTRFS_EXTENT_ITEM_KEY && |
| !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) |
| goto next; |
| |
| if (found_key.type == BTRFS_METADATA_ITEM_KEY) { |
| iref = (struct btrfs_extent_inline_ref *)(ei + 1); |
| level = found_key.offset; |
| } else { |
| struct btrfs_tree_block_info *binfo; |
| |
| binfo = (struct btrfs_tree_block_info *)(ei + 1); |
| iref = (struct btrfs_extent_inline_ref *)(binfo + 1); |
| level = btrfs_tree_block_level(leaf, binfo); |
| } |
| |
| /* |
| * For a root extent, it must be of the following type and the |
| * first (and only one) iref in the item. |
| */ |
| type = btrfs_extent_inline_ref_type(leaf, iref); |
| if (type != BTRFS_TREE_BLOCK_REF_KEY) |
| goto next; |
| |
| root_id = btrfs_extent_inline_ref_offset(leaf, iref); |
| entry = lookup_cache_extent(roots_info_cache, root_id, 1); |
| if (!entry) { |
| rii = malloc(sizeof(struct root_item_info)); |
| if (!rii) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| rii->cache_extent.start = root_id; |
| rii->cache_extent.size = 1; |
| rii->level = (u8)-1; |
| entry = &rii->cache_extent; |
| ret = insert_cache_extent(roots_info_cache, entry); |
| ASSERT(ret == 0); |
| } else { |
| rii = container_of(entry, struct root_item_info, |
| cache_extent); |
| } |
| |
| ASSERT(rii->cache_extent.start == root_id); |
| ASSERT(rii->cache_extent.size == 1); |
| |
| if (level > rii->level || rii->level == (u8)-1) { |
| rii->level = level; |
| rii->bytenr = found_key.objectid; |
| rii->gen = btrfs_extent_generation(leaf, ei); |
| rii->node_count = 1; |
| } else if (level == rii->level) { |
| rii->node_count++; |
| } |
| next: |
| path.slots[0]++; |
| } |
| |
| out: |
| btrfs_release_path(&path); |
| |
| return ret; |
| } |
| |
| static int maybe_repair_root_item(struct btrfs_path *path, |
| const struct btrfs_key *root_key, |
| const int read_only_mode) |
| { |
| const u64 root_id = root_key->objectid; |
| struct cache_extent *entry; |
| struct root_item_info *rii; |
| struct btrfs_root_item ri; |
| unsigned long offset; |
| |
| entry = lookup_cache_extent(roots_info_cache, root_id, 1); |
| if (!entry) { |
| fprintf(stderr, |
| "Error: could not find extent items for root %llu\n", |
| root_key->objectid); |
| return -ENOENT; |
| } |
| |
| rii = container_of(entry, struct root_item_info, cache_extent); |
| ASSERT(rii->cache_extent.start == root_id); |
| ASSERT(rii->cache_extent.size == 1); |
| |
| if (rii->node_count != 1) { |
| fprintf(stderr, |
| "Error: could not find btree root extent for root %llu\n", |
| root_id); |
| return -ENOENT; |
| } |
| |
| offset = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
| read_extent_buffer(path->nodes[0], &ri, offset, sizeof(ri)); |
| |
| if (btrfs_root_bytenr(&ri) != rii->bytenr || |
| btrfs_root_level(&ri) != rii->level || |
| btrfs_root_generation(&ri) != rii->gen) { |
| |
| /* |
| * If we're in repair mode but our caller told us to not update |
| * the root item, i.e. just check if it needs to be updated, don't |
| * print this message, since the caller will call us again shortly |
| * for the same root item without read only mode (the caller will |
| * open a transaction first). |
| */ |
| if (!(read_only_mode && repair)) |
| fprintf(stderr, |
| "%sroot item for root %llu," |
| " current bytenr %llu, current gen %llu, current level %u," |
| " new bytenr %llu, new gen %llu, new level %u\n", |
| (read_only_mode ? "" : "fixing "), |
| root_id, |
| btrfs_root_bytenr(&ri), btrfs_root_generation(&ri), |
| btrfs_root_level(&ri), |
| rii->bytenr, rii->gen, rii->level); |
| |
| if (btrfs_root_generation(&ri) > rii->gen) { |
| fprintf(stderr, |
| "root %llu has a root item with a more recent gen (%llu) compared to the found root node (%llu)\n", |
| root_id, btrfs_root_generation(&ri), rii->gen); |
| return -EINVAL; |
| } |
| |
| if (!read_only_mode) { |
| btrfs_set_root_bytenr(&ri, rii->bytenr); |
| btrfs_set_root_level(&ri, rii->level); |
| btrfs_set_root_generation(&ri, rii->gen); |
| write_extent_buffer(path->nodes[0], &ri, |
| offset, sizeof(ri)); |
| } |
| |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * A regression introduced in the 3.17 kernel (more specifically in 3.17-rc2), |
| * caused read-only snapshots to be corrupted if they were created at a moment |
| * when the source subvolume/snapshot had orphan items. The issue was that the |
| * on-disk root items became incorrect, referring to the pre orphan cleanup root |
| * node instead of the post orphan cleanup root node. |
| * So this function, and its callees, just detects and fixes those cases. Even |
| * though the regression was for read-only snapshots, this function applies to |
| * any snapshot/subvolume root. |
| * This must be run before any other repair code - not doing it so, makes other |
| * repair code delete or modify backrefs in the extent tree for example, which |
| * will result in an inconsistent fs after repairing the root items. |
| */ |
| static int repair_root_items(struct btrfs_fs_info *info) |
| { |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct extent_buffer *leaf; |
| struct btrfs_trans_handle *trans = NULL; |
| int ret = 0; |
| int bad_roots = 0; |
| int need_trans = 0; |
| |
| btrfs_init_path(&path); |
| |
| ret = build_roots_info_cache(info); |
| if (ret) |
| goto out; |
| |
| key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| key.type = BTRFS_ROOT_ITEM_KEY; |
| key.offset = 0; |
| |
| again: |
| /* |
| * Avoid opening and committing transactions if a leaf doesn't have |
| * any root items that need to be fixed, so that we avoid rotating |
| * backup roots unnecessarily. |
| */ |
| if (need_trans) { |
| trans = btrfs_start_transaction(info->tree_root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| goto out; |
| } |
| } |
| |
| ret = btrfs_search_slot(trans, info->tree_root, &key, &path, |
| 0, trans ? 1 : 0); |
| if (ret < 0) |
| goto out; |
| leaf = path.nodes[0]; |
| |
| while (1) { |
| struct btrfs_key found_key; |
| |
| if (path.slots[0] >= btrfs_header_nritems(leaf)) { |
| int no_more_keys = find_next_key(&path, &key); |
| |
| btrfs_release_path(&path); |
| if (trans) { |
| ret = btrfs_commit_transaction(trans, |
| info->tree_root); |
| trans = NULL; |
| if (ret < 0) |
| goto out; |
| } |
| need_trans = 0; |
| if (no_more_keys) |
| break; |
| goto again; |
| } |
| |
| btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); |
| |
| if (found_key.type != BTRFS_ROOT_ITEM_KEY) |
| goto next; |
| if (found_key.objectid == BTRFS_TREE_RELOC_OBJECTID) |
| goto next; |
| |
| ret = maybe_repair_root_item(&path, &found_key, trans ? 0 : 1); |
| if (ret < 0) |
| goto out; |
| if (ret) { |
| if (!trans && repair) { |
| need_trans = 1; |
| key = found_key; |
| btrfs_release_path(&path); |
| goto again; |
| } |
| bad_roots++; |
| } |
| next: |
| path.slots[0]++; |
| } |
| ret = 0; |
| out: |
| free_roots_info_cache(); |
| btrfs_release_path(&path); |
| if (trans) |
| btrfs_commit_transaction(trans, info->tree_root); |
| if (ret < 0) |
| return ret; |
| |
| return bad_roots; |
| } |
| |
| static int clear_free_space_cache(struct btrfs_fs_info *fs_info) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_block_group_cache *bg_cache; |
| u64 current = 0; |
| int ret = 0; |
| |
| /* Clear all free space cache inodes and its extent data */ |
| while (1) { |
| bg_cache = btrfs_lookup_first_block_group(fs_info, current); |
| if (!bg_cache) |
| break; |
| ret = btrfs_clear_free_space_cache(fs_info, bg_cache); |
| if (ret < 0) |
| return ret; |
| current = bg_cache->key.objectid + bg_cache->key.offset; |
| } |
| |
| /* Don't forget to set cache_generation to -1 */ |
| trans = btrfs_start_transaction(fs_info->tree_root, 0); |
| if (IS_ERR(trans)) { |
| error("failed to update super block cache generation"); |
| return PTR_ERR(trans); |
| } |
| btrfs_set_super_cache_generation(fs_info->super_copy, (u64)-1); |
| btrfs_commit_transaction(trans, fs_info->tree_root); |
| |
| return ret; |
| } |
| |
| const char * const cmd_check_usage[] = { |
| "btrfs check [options] <device>", |
| "Check structural integrity of a filesystem (unmounted).", |
| "Check structural integrity of an unmounted filesystem. Verify internal", |
| "trees' consistency and item connectivity. In the repair mode try to", |
| "fix the problems found. ", |
| "WARNING: the repair mode is considered dangerous", |
| "", |
| "-s|--super <superblock> use this superblock copy", |
| "-b|--backup use the first valid backup root copy", |
| "--repair try to repair the filesystem", |
| "--readonly run in read-only mode (default)", |
| "--init-csum-tree create a new CRC tree", |
| "--init-extent-tree create a new extent tree", |
| "--mode <MODE> allows choice of memory/IO trade-offs", |
| " where MODE is one of:", |
| " original - read inodes and extents to memory (requires", |
| " more memory, does less IO)", |
| " lowmem - try to use less memory but read blocks again", |
| " when needed", |
| "--check-data-csum verify checksums of data blocks", |
| "-Q|--qgroup-report print a report on qgroup consistency", |
| "-E|--subvol-extents <subvolid>", |
| " print subvolume extents and sharing state", |
| "-r|--tree-root <bytenr> use the given bytenr for the tree root", |
| "--chunk-root <bytenr> use the given bytenr for the chunk tree root", |
| "-p|--progress indicate progress", |
| "--clear-space-cache v1|v2 clear space cache for v1 or v2", |
| NULL |
| }; |
| |
| int cmd_check(int argc, char **argv) |
| { |
| struct cache_tree root_cache; |
| struct btrfs_root *root; |
| struct btrfs_fs_info *info; |
| u64 bytenr = 0; |
| u64 subvolid = 0; |
| u64 tree_root_bytenr = 0; |
| u64 chunk_root_bytenr = 0; |
| char uuidbuf[BTRFS_UUID_UNPARSED_SIZE]; |
| int ret; |
| int err = 0; |
| u64 num; |
| int init_csum_tree = 0; |
| int readonly = 0; |
| int clear_space_cache = 0; |
| int qgroup_report = 0; |
| int qgroups_repaired = 0; |
| unsigned ctree_flags = OPEN_CTREE_EXCLUSIVE; |
| |
| while(1) { |
| int c; |
| enum { GETOPT_VAL_REPAIR = 257, GETOPT_VAL_INIT_CSUM, |
| GETOPT_VAL_INIT_EXTENT, GETOPT_VAL_CHECK_CSUM, |
| GETOPT_VAL_READONLY, GETOPT_VAL_CHUNK_TREE, |
| GETOPT_VAL_MODE, GETOPT_VAL_CLEAR_SPACE_CACHE }; |
| static const struct option long_options[] = { |
| { "super", required_argument, NULL, 's' }, |
| { "repair", no_argument, NULL, GETOPT_VAL_REPAIR }, |
| { "readonly", no_argument, NULL, GETOPT_VAL_READONLY }, |
| { "init-csum-tree", no_argument, NULL, |
| GETOPT_VAL_INIT_CSUM }, |
| { "init-extent-tree", no_argument, NULL, |
| GETOPT_VAL_INIT_EXTENT }, |
| { "check-data-csum", no_argument, NULL, |
| GETOPT_VAL_CHECK_CSUM }, |
| { "backup", no_argument, NULL, 'b' }, |
| { "subvol-extents", required_argument, NULL, 'E' }, |
| { "qgroup-report", no_argument, NULL, 'Q' }, |
| { "tree-root", required_argument, NULL, 'r' }, |
| { "chunk-root", required_argument, NULL, |
| GETOPT_VAL_CHUNK_TREE }, |
| { "progress", no_argument, NULL, 'p' }, |
| { "mode", required_argument, NULL, |
| GETOPT_VAL_MODE }, |
| { "clear-space-cache", required_argument, NULL, |
| GETOPT_VAL_CLEAR_SPACE_CACHE}, |
| { NULL, 0, NULL, 0} |
| }; |
| |
| c = getopt_long(argc, argv, "as:br:p", long_options, NULL); |
| if (c < 0) |
| break; |
| switch(c) { |
| case 'a': /* ignored */ break; |
| case 'b': |
| ctree_flags |= OPEN_CTREE_BACKUP_ROOT; |
| break; |
| case 's': |
| num = arg_strtou64(optarg); |
| if (num >= BTRFS_SUPER_MIRROR_MAX) { |
| error( |
| "super mirror should be less than %d", |
| BTRFS_SUPER_MIRROR_MAX); |
| exit(1); |
| } |
| bytenr = btrfs_sb_offset(((int)num)); |
| printf("using SB copy %llu, bytenr %llu\n", num, |
| (unsigned long long)bytenr); |
| break; |
| case 'Q': |
| qgroup_report = 1; |
| break; |
| case 'E': |
| subvolid = arg_strtou64(optarg); |
| break; |
| case 'r': |
| tree_root_bytenr = arg_strtou64(optarg); |
| break; |
| case GETOPT_VAL_CHUNK_TREE: |
| chunk_root_bytenr = arg_strtou64(optarg); |
| break; |
| case 'p': |
| ctx.progress_enabled = true; |
| break; |
| case '?': |
| case 'h': |
| usage(cmd_check_usage); |
| case GETOPT_VAL_REPAIR: |
| printf("enabling repair mode\n"); |
| repair = 1; |
| ctree_flags |= OPEN_CTREE_WRITES; |
| break; |
| case GETOPT_VAL_READONLY: |
| readonly = 1; |
| break; |
| case GETOPT_VAL_INIT_CSUM: |
| printf("Creating a new CRC tree\n"); |
| init_csum_tree = 1; |
| repair = 1; |
| ctree_flags |= OPEN_CTREE_WRITES; |
| break; |
| case GETOPT_VAL_INIT_EXTENT: |
| init_extent_tree = 1; |
| ctree_flags |= (OPEN_CTREE_WRITES | |
| OPEN_CTREE_NO_BLOCK_GROUPS); |
| repair = 1; |
| break; |
| case GETOPT_VAL_CHECK_CSUM: |
| check_data_csum = 1; |
| break; |
| case GETOPT_VAL_MODE: |
| check_mode = parse_check_mode(optarg); |
| if (check_mode == CHECK_MODE_UNKNOWN) { |
| error("unknown mode: %s", optarg); |
| exit(1); |
| } |
| break; |
| case GETOPT_VAL_CLEAR_SPACE_CACHE: |
| if (strcmp(optarg, "v1") == 0) { |
| clear_space_cache = 1; |
| } else if (strcmp(optarg, "v2") == 0) { |
| clear_space_cache = 2; |
| ctree_flags |= OPEN_CTREE_INVALIDATE_FST; |
| } else { |
| error( |
| "invalid argument to --clear-space-cache, must be v1 or v2"); |
| exit(1); |
| } |
| ctree_flags |= OPEN_CTREE_WRITES; |
| break; |
| } |
| } |
| |
| if (check_argc_exact(argc - optind, 1)) |
| usage(cmd_check_usage); |
| |
| if (ctx.progress_enabled) { |
| ctx.tp = TASK_NOTHING; |
| ctx.info = task_init(print_status_check, print_status_return, &ctx); |
| } |
| |
| /* This check is the only reason for --readonly to exist */ |
| if (readonly && repair) { |
| error("repair options are not compatible with --readonly"); |
| exit(1); |
| } |
| |
| /* |
| * Not supported yet |
| */ |
| if (repair && check_mode == CHECK_MODE_LOWMEM) { |
| error("low memory mode doesn't support repair yet"); |
| exit(1); |
| } |
| |
| radix_tree_init(); |
| cache_tree_init(&root_cache); |
| |
| if((ret = check_mounted(argv[optind])) < 0) { |
| error("could not check mount status: %s", strerror(-ret)); |
| err |= !!ret; |
| goto err_out; |
| } else if(ret) { |
| error("%s is currently mounted, aborting", argv[optind]); |
| ret = -EBUSY; |
| err |= !!ret; |
| goto err_out; |
| } |
| |
| /* only allow partial opening under repair mode */ |
| if (repair) |
| ctree_flags |= OPEN_CTREE_PARTIAL; |
| |
| info = open_ctree_fs_info(argv[optind], bytenr, tree_root_bytenr, |
| chunk_root_bytenr, ctree_flags); |
| if (!info) { |
| error("cannot open file system"); |
| ret = -EIO; |
| err |= !!ret; |
| goto err_out; |
| } |
| |
| global_info = info; |
| root = info->fs_root; |
| if (clear_space_cache == 1) { |
| if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) { |
| error( |
| "free space cache v2 detected, use --clear-space-cache v2"); |
| ret = 1; |
| goto close_out; |
| } |
| printf("Clearing free space cache\n"); |
| ret = clear_free_space_cache(info); |
| if (ret) { |
| error("failed to clear free space cache"); |
| ret = 1; |
| } else { |
| printf("Free space cache cleared\n"); |
| } |
| goto close_out; |
| } else if (clear_space_cache == 2) { |
| if (!btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) { |
| printf("no free space cache v2 to clear\n"); |
| ret = 0; |
| goto close_out; |
| } |
| printf("Clear free space cache v2\n"); |
| ret = btrfs_clear_free_space_tree(info); |
| if (ret) { |
| error("failed to clear free space cache v2: %d", ret); |
| ret = 1; |
| } else { |
| printf("free space cache v2 cleared\n"); |
| } |
| goto close_out; |
| } |
| |
| /* |
| * repair mode will force us to commit transaction which |
| * will make us fail to load log tree when mounting. |
| */ |
| if (repair && btrfs_super_log_root(info->super_copy)) { |
| ret = ask_user("repair mode will force to clear out log tree, are you sure?"); |
| if (!ret) { |
| ret = 1; |
| err |= !!ret; |
| goto close_out; |
| } |
| ret = zero_log_tree(root); |
| err |= !!ret; |
| if (ret) { |
| error("failed to zero log tree: %d", ret); |
| goto close_out; |
| } |
| } |
| |
| uuid_unparse(info->super_copy->fsid, uuidbuf); |
| if (qgroup_report) { |
| printf("Print quota groups for %s\nUUID: %s\n", argv[optind], |
| uuidbuf); |
| ret = qgroup_verify_all(info); |
| err |= !!ret; |
| if (ret == 0) |
| report_qgroups(1); |
| goto close_out; |
| } |
| if (subvolid) { |
| printf("Print extent state for subvolume %llu on %s\nUUID: %s\n", |
| subvolid, argv[optind], uuidbuf); |
| ret = print_extent_state(info, subvolid); |
| err |= !!ret; |
| goto close_out; |
| } |
| printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf); |
| |
| if (!extent_buffer_uptodate(info->tree_root->node) || |
| !extent_buffer_uptodate(info->dev_root->node) || |
| !extent_buffer_uptodate(info->chunk_root->node)) { |
| error("critical roots corrupted, unable to check the filesystem"); |
| err |= !!ret; |
| ret = -EIO; |
| goto close_out; |
| } |
| |
| if (init_extent_tree || init_csum_tree) { |
| struct btrfs_trans_handle *trans; |
| |
| trans = btrfs_start_transaction(info->extent_root, 0); |
| if (IS_ERR(trans)) { |
| error("error starting transaction"); |
| ret = PTR_ERR(trans); |
| err |= !!ret; |
| goto close_out; |
| } |
| |
| if (init_extent_tree) { |
| printf("Creating a new extent tree\n"); |
| ret = reinit_extent_tree(trans, info); |
| err |= !!ret; |
| if (ret) |
| goto close_out; |
| } |
| |
| if (init_csum_tree) { |
| printf("Reinitialize checksum tree\n"); |
| ret = btrfs_fsck_reinit_root(trans, info->csum_root, 0); |
| if (ret) { |
| error("checksum tree initialization failed: %d", |
| ret); |
| ret = -EIO; |
| err |= !!ret; |
| goto close_out; |
| } |
| |
| ret = fill_csum_tree(trans, info->csum_root, |
| init_extent_tree); |
| err |= !!ret; |
| if (ret) { |
| error("checksum tree refilling failed: %d", ret); |
| return -EIO; |
| } |
| } |
| /* |
| * Ok now we commit and run the normal fsck, which will add |
| * extent entries for all of the items it finds. |
| */ |
| ret = btrfs_commit_transaction(trans, info->extent_root); |
| err |= !!ret; |
| if (ret) |
| goto close_out; |
| } |
| if (!extent_buffer_uptodate(info->extent_root->node)) { |
| error("critical: extent_root, unable to check the filesystem"); |
| ret = -EIO; |
| err |= !!ret; |
| goto close_out; |
| } |
| if (!extent_buffer_uptodate(info->csum_root->node)) { |
| error("critical: csum_root, unable to check the filesystem"); |
| ret = -EIO; |
| err |= !!ret; |
| goto close_out; |
| } |
| |
| if (!ctx.progress_enabled) |
| fprintf(stderr, "checking extents\n"); |
| if (check_mode == CHECK_MODE_LOWMEM) |
| ret = check_chunks_and_extents_v2(root); |
| else |
| ret = check_chunks_and_extents(root); |
| err |= !!ret; |
| if (ret) |
| error( |
| "errors found in extent allocation tree or chunk allocation"); |
| |
| ret = repair_root_items(info); |
| err |= !!ret; |
| if (ret < 0) { |
| error("failed to repair root items: %s", strerror(-ret)); |
| goto close_out; |
| } |
| if (repair) { |
| fprintf(stderr, "Fixed %d roots.\n", ret); |
| ret = 0; |
| } else if (ret > 0) { |
| fprintf(stderr, |
| "Found %d roots with an outdated root item.\n", |
| ret); |
| fprintf(stderr, |
| "Please run a filesystem check with the option --repair to fix them.\n"); |
| ret = 1; |
| err |= !!ret; |
| goto close_out; |
| } |
| |
| if (!ctx.progress_enabled) { |
| if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
| fprintf(stderr, "checking free space tree\n"); |
| else |
| fprintf(stderr, "checking free space cache\n"); |
| } |
| ret = check_space_cache(root); |
| err |= !!ret; |
| if (ret) { |
| if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
| error("errors found in free space tree"); |
| else |
| error("errors found in free space cache"); |
| goto out; |
| } |
| |
| /* |
| * We used to have to have these hole extents in between our real |
| * extents so if we don't have this flag set we need to make sure there |
| * are no gaps in the file extents for inodes, otherwise we can just |
| * ignore it when this happens. |
| */ |
| no_holes = btrfs_fs_incompat(root->fs_info, NO_HOLES); |
| if (!ctx.progress_enabled) |
| fprintf(stderr, "checking fs roots\n"); |
| if (check_mode == CHECK_MODE_LOWMEM) |
| ret = check_fs_roots_v2(root->fs_info); |
| else |
| ret = check_fs_roots(root, &root_cache); |
| err |= !!ret; |
| if (ret) { |
| error("errors found in fs roots"); |
| goto out; |
| } |
| |
| fprintf(stderr, "checking csums\n"); |
| ret = check_csums(root); |
| err |= !!ret; |
| if (ret) { |
| error("errors found in csum tree"); |
| goto out; |
| } |
| |
| fprintf(stderr, "checking root refs\n"); |
| /* For low memory mode, check_fs_roots_v2 handles root refs */ |
| if (check_mode != CHECK_MODE_LOWMEM) { |
| ret = check_root_refs(root, &root_cache); |
| err |= !!ret; |
| if (ret) { |
| error("errors found in root refs"); |
| goto out; |
| } |
| } |
| |
| while (repair && !list_empty(&root->fs_info->recow_ebs)) { |
| struct extent_buffer *eb; |
| |
| eb = list_first_entry(&root->fs_info->recow_ebs, |
| struct extent_buffer, recow); |
| list_del_init(&eb->recow); |
| ret = recow_extent_buffer(root, eb); |
| err |= !!ret; |
| if (ret) { |
| error("fails to fix transid errors"); |
| break; |
| } |
| } |
| |
| while (!list_empty(&delete_items)) { |
| struct bad_item *bad; |
| |
| bad = list_first_entry(&delete_items, struct bad_item, list); |
| list_del_init(&bad->list); |
| if (repair) { |
| ret = delete_bad_item(root, bad); |
| err |= !!ret; |
| } |
| free(bad); |
| } |
| |
| if (info->quota_enabled) { |
| fprintf(stderr, "checking quota groups\n"); |
| ret = qgroup_verify_all(info); |
| err |= !!ret; |
| if (ret) { |
| error("failed to check quota groups"); |
| goto out; |
| } |
| report_qgroups(0); |
| ret = repair_qgroups(info, &qgroups_repaired); |
| err |= !!ret; |
| if (err) { |
| error("failed to repair quota groups"); |
| goto out; |
| } |
| ret = 0; |
| } |
| |
| if (!list_empty(&root->fs_info->recow_ebs)) { |
| error("transid errors in file system"); |
| ret = 1; |
| err |= !!ret; |
| } |
| out: |
| if (found_old_backref) { /* |
| * there was a disk format change when mixed |
| * backref was in testing tree. The old format |
| * existed about one week. |
| */ |
| printf("\n * Found old mixed backref format. " |
| "The old format is not supported! *" |
| "\n * Please mount the FS in readonly mode, " |
| "backup data and re-format the FS. *\n\n"); |
| err |= 1; |
| } |
| printf("found %llu bytes used, ", |
| (unsigned long long)bytes_used); |
| if (err) |
| printf("error(s) found\n"); |
| else |
| printf("no error found\n"); |
| printf("total csum bytes: %llu\n",(unsigned long long)total_csum_bytes); |
| printf("total tree bytes: %llu\n", |
| (unsigned long long)total_btree_bytes); |
| printf("total fs tree bytes: %llu\n", |
| (unsigned long long)total_fs_tree_bytes); |
| printf("total extent tree bytes: %llu\n", |
| (unsigned long long)total_extent_tree_bytes); |
| printf("btree space waste bytes: %llu\n", |
| (unsigned long long)btree_space_waste); |
| printf("file data blocks allocated: %llu\n referenced %llu\n", |
| (unsigned long long)data_bytes_allocated, |
| (unsigned long long)data_bytes_referenced); |
| |
| free_qgroup_counts(); |
| free_root_recs_tree(&root_cache); |
| close_out: |
| close_ctree(root); |
| err_out: |
| if (ctx.progress_enabled) |
| task_deinit(ctx.info); |
| |
| return err; |
| } |