| /* |
| * 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. |
| */ |
| |
| #define _XOPEN_SOURCE 500 |
| #define _GNU_SOURCE 1 |
| #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 "transaction.h" |
| #include "version.h" |
| #include "utils.h" |
| #include "commands.h" |
| #include "free-space-cache.h" |
| #include "btrfsck.h" |
| #include "qgroup-verify.h" |
| #include "rbtree-utils.h" |
| #include "backref.h" |
| #include "ulist.h" |
| |
| 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 repair = 0; |
| static int no_holes = 0; |
| static int init_extent_tree = 0; |
| static int check_data_csum = 0; |
| |
| 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; |
| }; |
| |
| 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; |
| }; |
| |
| struct tree_backref { |
| struct extent_backref node; |
| union { |
| u64 parent; |
| u64 root; |
| }; |
| }; |
| |
| 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 found_rec:1; |
| unsigned int content_checked:1; |
| unsigned int owner_ref_checked:1; |
| unsigned int is_root:1; |
| unsigned int metadata:1; |
| }; |
| |
| 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; |
| unsigned int filetype:8; |
| int errors; |
| unsigned int ref_type; |
| u64 dir; |
| u64 index; |
| u16 namelen; |
| char name[0]; |
| }; |
| |
| struct dropping_root_item_record { |
| struct list_head list; |
| struct btrfs_root_item ri; |
| struct btrfs_key found_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 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; |
| u64 first_extent_gap; |
| |
| 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) |
| |
| 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]; |
| }; |
| |
| 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; |
| }; |
| |
| 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; |
| size_t size; |
| |
| rec = malloc(sizeof(*rec)); |
| memcpy(rec, orig_rec, sizeof(*rec)); |
| rec->refs = 1; |
| INIT_LIST_HEAD(&rec->backrefs); |
| |
| list_for_each_entry(orig, &orig_rec->backrefs, list) { |
| size = sizeof(*orig) + orig->namelen + 1; |
| backref = malloc(size); |
| memcpy(backref, orig, size); |
| list_add_tail(&backref->list, &rec->backrefs); |
| } |
| return rec; |
| } |
| |
| 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"); |
| fprintf(stderr, "\n"); |
| } |
| |
| 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 unmatch"); |
| if (errors & REF_ERR_FILETYPE_UNMATCH) |
| fprintf(stderr, ", filetype unmatch"); |
| 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); |
| rec->refs--; |
| rec = node->data; |
| } |
| } else if (mod) { |
| rec = calloc(1, sizeof(*rec)); |
| rec->ino = ino; |
| rec->extent_start = (u64)-1; |
| rec->first_extent_gap = (u64)-1; |
| rec->refs = 1; |
| INIT_LIST_HEAD(&rec->backrefs); |
| |
| node = malloc(sizeof(*node)); |
| 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); |
| BUG_ON(ret); |
| } |
| return rec; |
| } |
| |
| static void free_inode_rec(struct inode_record *rec) |
| { |
| struct inode_backref *backref; |
| |
| if (--rec->refs > 0) |
| return; |
| |
| while (!list_empty(&rec->backrefs)) { |
| backref = list_entry(rec->backrefs.next, |
| struct inode_backref, list); |
| list_del(&backref->list); |
| free(backref); |
| } |
| 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; |
| unsigned char 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) { |
| 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->extent_start == (u64)-1 || rec->extent_start > 0) |
| rec->first_extent_gap = 0; |
| if (rec->nlink > 0 && !no_holes && |
| (rec->extent_end < rec->isize || |
| rec->first_extent_gap < 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); |
| 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, |
| int filetype, int itemtype, int errors) |
| { |
| struct inode_record *rec; |
| struct inode_backref *backref; |
| |
| rec = get_inode_rec(inode_cache, ino, 1); |
| backref = get_inode_backref(rec, name, namelen, dir); |
| 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; |
| |
| 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 (dst->first_extent_gap > src->first_extent_gap) |
| dst->first_extent_gap = src->first_extent_gap; |
| |
| 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 && |
| dst->extent_end < dst->first_extent_gap) |
| dst->first_extent_gap = 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)); |
| 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); |
| 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); |
| } |
| 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)); |
| 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); |
| BUG_ON(ret); |
| return 0; |
| } |
| |
| 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; |
| |
| if (level == wc->active_node) |
| return 0; |
| |
| BUG_ON(wc->active_node <= level); |
| node = find_shared_node(&wc->shared, bytenr); |
| if (!node) { |
| add_shared_node(&wc->shared, bytenr, refs); |
| 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 btrfs_root *root, |
| 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; |
| int 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 (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)(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); |
| 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); |
| 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: |
| if (ret < 0) |
| return ret; |
| btrfs_release_path(&path); |
| 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 && |
| rec->extent_end < rec->first_extent_gap) |
| rec->first_extent_gap = rec->extent_end; |
| |
| 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; |
| |
| if (disk_bytenr > 0) { |
| 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); |
| } |
| switch (key.type) { |
| case BTRFS_DIR_ITEM_KEY: |
| case BTRFS_DIR_INDEX_KEY: |
| ret = process_dir_item(root, 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; |
| } |
| |
| 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 = btrfs_level_size(root, level - 1); |
| 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 btrfs_root *root, |
| 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; |
| } |
| |
| static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, |
| struct walk_control *wc, int *level) |
| { |
| 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); |
| ret = btrfs_lookup_extent_info(NULL, root, |
| path->nodes[*level]->start, |
| *level, 1, &refs, NULL); |
| if (ret < 0) { |
| err = ret; |
| goto out; |
| } |
| |
| 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 = btrfs_level_size(root, *level - 1); |
| ret = btrfs_lookup_extent_info(NULL, root, bytenr, *level - 1, |
| 1, &refs, NULL); |
| if (ret < 0) |
| refs = 0; |
| |
| 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 (!next) { |
| err = -EIO; |
| goto out; |
| } |
| } |
| |
| ret = check_child_node(root, cur, path->slots[*level], next); |
| if (ret) { |
| 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 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 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 = list_entry(rec->backrefs.next, struct inode_backref, list); |
| 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) |
| { |
| struct btrfs_key key; |
| int ret; |
| |
| key.objectid = BTRFS_ORPHAN_OBJECTID; |
| key.type = BTRFS_ORPHAN_ITEM_KEY; |
| key.offset = rec->ino; |
| |
| ret = btrfs_insert_empty_item(trans, root, path, &key, 0); |
| btrfs_release_path(path); |
| if (!ret) |
| rec->errors &= ~I_ERR_NO_ORPHAN_ITEM; |
| 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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| btrfs_free_path(path); |
| return PTR_ERR(trans); |
| } |
| |
| fprintf(stderr, "repairing missing dir index item for inode %llu\n", |
| (unsigned long long)rec->ino); |
| 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_free_path(path); |
| btrfs_commit_transaction(trans, root); |
| |
| backref->found_dir_index = 1; |
| dir_rec = get_inode_rec(inode_cache, backref->dir, 0); |
| 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 cache_tree *inode_cache, |
| struct inode_record *rec, |
| struct inode_backref *backref) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_dir_item *di; |
| struct btrfs_path *path; |
| int ret = 0; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| btrfs_free_path(path); |
| 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); |
| |
| 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_free_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_free_path(path); |
| btrfs_commit_transaction(trans, root); |
| return ret; |
| } |
| |
| 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) { |
| /* 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, inode_cache, rec, backref); |
| if (ret) |
| break; |
| repaired++; |
| list_del(&backref->list); |
| free(backref); |
| } |
| |
| 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 && |
| backref->found_dir_index) { |
| if (!backref->errors && |
| backref->found_inode_ref) { |
| list_del(&backref->list); |
| free(backref); |
| } |
| } |
| } |
| |
| } |
| return ret ? ret : repaired; |
| } |
| |
| 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))) |
| return rec->errors; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| btrfs_free_path(path); |
| return PTR_ERR(trans); |
| } |
| |
| if (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); |
| btrfs_commit_transaction(trans, root); |
| btrfs_free_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; |
| 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); |
| 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); |
| error++; |
| } |
| } else { |
| 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 (repair) { |
| ret = try_repair_inode(root, rec); |
| if (ret == 0 && can_free_inode_rec(rec)) { |
| free_inode_rec(rec); |
| continue; |
| } |
| ret = 0; |
| } |
| |
| error++; |
| 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; |
| 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)); |
| rec->objectid = objectid; |
| INIT_LIST_HEAD(&rec->backrefs); |
| rec->cache.start = objectid; |
| rec->cache.size = 1; |
| |
| ret = insert_cache_extent(root_cache, &rec->cache); |
| BUG_ON(ret); |
| } |
| 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 = malloc(sizeof(*backref) + namelen + 1); |
| memset(backref, 0, sizeof(*backref)); |
| 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 = list_entry(rec->backrefs.next, |
| struct root_backref, list); |
| list_del(&backref->list); |
| free(backref); |
| } |
| |
| kfree(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); |
| backref = get_root_backref(rec, ref_root, dir, index, name, namelen); |
| |
| 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); |
| 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); |
| 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 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; |
| enum btrfs_tree_block_status status; |
| |
| if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
| rec = get_root_rec(root_cache, root->root_key.objectid); |
| 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); |
| |
| 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; |
| 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); |
| 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); |
| |
| 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; |
| 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; |
| |
| /* |
| * 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__); |
| |
| 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 = list_entry(cur, struct extent_backref, list); |
| cur = cur->next; |
| if (!back->found_extent_tree) { |
| err = 1; |
| if (!print_errs) |
| goto out; |
| if (back->is_data) { |
| dback = (struct 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 = (struct 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 = (struct 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 = (struct 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 = (struct 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 = list_entry(cur, struct extent_backref, list); |
| list_del(cur); |
| free(back); |
| } |
| return 0; |
| } |
| |
| static void free_extent_record_cache(struct btrfs_fs_info *fs_info, |
| 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); |
| btrfs_unpin_extent(fs_info, rec->start, rec->max_size); |
| 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)) { |
| 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 = (struct 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 = list_entry(cur, struct extent_backref, list); |
| cur = cur->next; |
| if (node->is_data) |
| return 0; |
| back = (struct 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_trans_handle *trans, |
| 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; |
| |
| 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_trans_handle *trans, |
| 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_trans_handle *trans, |
| 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(trans, 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(trans, 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_trans_handle *trans, |
| struct btrfs_root *root, |
| struct extent_buffer *buf, |
| enum btrfs_tree_block_status status) |
| { |
| 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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -EIO; |
| |
| ret = btrfs_find_all_roots(trans, root->fs_info, buf->start, |
| 0, &roots); |
| if (ret) { |
| btrfs_free_path(path); |
| return -EIO; |
| } |
| |
| 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; |
| } |
| |
| record_root_in_trans(trans, search_root); |
| |
| 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; |
| break; |
| } |
| if (status == BTRFS_TREE_BLOCK_BAD_KEY_ORDER) |
| ret = fix_key_order(trans, search_root, path); |
| else if (status == BTRFS_TREE_BLOCK_INVALID_OFFSETS) |
| ret = fix_item_offset(trans, search_root, path); |
| if (ret) |
| break; |
| btrfs_release_path(path); |
| } |
| ulist_free(roots); |
| btrfs_free_path(path); |
| return ret; |
| } |
| |
| static int check_block(struct btrfs_trans_handle *trans, |
| 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(trans, 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 cow'ed 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 = list_entry(cur, struct extent_backref, list); |
| cur = cur->next; |
| if (node->is_data) |
| continue; |
| back = (struct 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)); |
| 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 = list_entry(cur, struct extent_backref, list); |
| cur = cur->next; |
| if (!node->is_data) |
| continue; |
| back = (struct 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)); |
| 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; |
| } |
| |
| static int add_extent_rec(struct cache_tree *extent_cache, |
| struct btrfs_key *parent_key, u64 parent_gen, |
| u64 start, u64 nr, u64 extent_item_refs, |
| int is_root, int inc_ref, int set_checked, |
| int metadata, int extent_rec, u64 max_size) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| int ret = 0; |
| int dup = 0; |
| |
| cache = lookup_cache_extent(extent_cache, start, nr); |
| if (cache) { |
| rec = container_of(cache, struct extent_record, cache); |
| if (inc_ref) |
| rec->refs++; |
| if (rec->nr == 1) |
| rec->nr = max(nr, 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 (extent_rec) { |
| if (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 = start; |
| tmp->max_size = max_size; |
| tmp->nr = nr; |
| tmp->found_rec = 1; |
| tmp->metadata = metadata; |
| tmp->extent_item_refs = extent_item_refs; |
| INIT_LIST_HEAD(&tmp->list); |
| list_add_tail(&tmp->list, &rec->dups); |
| rec->num_duplicates++; |
| } else { |
| rec->nr = nr; |
| rec->found_rec = 1; |
| } |
| } |
| |
| if (extent_item_refs && !dup) { |
| if (rec->extent_item_refs) { |
| fprintf(stderr, "block %llu rec " |
| "extent_item_refs %llu, passed %llu\n", |
| (unsigned long long)start, |
| (unsigned long long) |
| rec->extent_item_refs, |
| (unsigned long long)extent_item_refs); |
| } |
| rec->extent_item_refs = extent_item_refs; |
| } |
| if (is_root) |
| rec->is_root = 1; |
| if (set_checked) { |
| rec->content_checked = 1; |
| rec->owner_ref_checked = 1; |
| } |
| |
| if (parent_key) |
| btrfs_cpu_key_to_disk(&rec->parent_key, parent_key); |
| if (parent_gen) |
| rec->parent_generation = parent_gen; |
| |
| if (rec->max_size < max_size) |
| rec->max_size = max_size; |
| |
| maybe_free_extent_rec(extent_cache, rec); |
| return ret; |
| } |
| rec = malloc(sizeof(*rec)); |
| rec->start = start; |
| rec->max_size = max_size; |
| rec->nr = max(nr, max_size); |
| rec->found_rec = !!extent_rec; |
| rec->content_checked = 0; |
| rec->owner_ref_checked = 0; |
| rec->num_duplicates = 0; |
| rec->metadata = metadata; |
| INIT_LIST_HEAD(&rec->backrefs); |
| INIT_LIST_HEAD(&rec->dups); |
| INIT_LIST_HEAD(&rec->list); |
| |
| if (is_root) |
| rec->is_root = 1; |
| else |
| rec->is_root = 0; |
| |
| if (inc_ref) |
| rec->refs = 1; |
| else |
| rec->refs = 0; |
| |
| if (extent_item_refs) |
| rec->extent_item_refs = extent_item_refs; |
| else |
| rec->extent_item_refs = 0; |
| |
| if (parent_key) |
| btrfs_cpu_key_to_disk(&rec->parent_key, parent_key); |
| else |
| memset(&rec->parent_key, 0, sizeof(*parent_key)); |
| |
| if (parent_gen) |
| rec->parent_generation = parent_gen; |
| else |
| rec->parent_generation = 0; |
| |
| rec->cache.start = start; |
| rec->cache.size = nr; |
| ret = insert_cache_extent(extent_cache, &rec->cache); |
| BUG_ON(ret); |
| bytes_used += nr; |
| if (set_checked) { |
| rec->content_checked = 1; |
| rec->owner_ref_checked = 1; |
| } |
| 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; |
| |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) { |
| add_extent_rec(extent_cache, NULL, 0, bytenr, |
| 1, 0, 0, 0, 0, 1, 0, 0); |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) |
| abort(); |
| } |
| |
| rec = container_of(cache, struct extent_record, cache); |
| if (rec->start != bytenr) { |
| abort(); |
| } |
| |
| back = find_tree_backref(rec, parent, root); |
| if (!back) |
| back = alloc_tree_backref(rec, parent, root); |
| |
| 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; |
| } |
| 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; |
| |
| cache = lookup_cache_extent(extent_cache, bytenr, 1); |
| if (!cache) { |
| add_extent_rec(extent_cache, NULL, 0, bytenr, 1, 0, 0, 0, 0, |
| 0, 0, max_size); |
| 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); |
| |
| 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; |
| |
| 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) { |
| add_tree_backref(extent_cache, key.objectid, key.offset, 0, 0); |
| } else { |
| add_data_backref(extent_cache, key.objectid, key.offset, 0, |
| 0, 0, btrfs_ref_count_v0(leaf, ref0), 0, 0); |
| } |
| return 0; |
| } |
| #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 = malloc(btrfs_chunk_record_size(num_stripes)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| |
| memset(rec, 0, btrfs_chunk_record_size(num_stripes)); |
| |
| 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; |
| int ret = 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 = malloc(sizeof(*rec)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| memset(rec, 0, sizeof(*rec)); |
| |
| 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 = malloc(sizeof(*rec)); |
| if (!rec) { |
| fprintf(stderr, "memory allocation failed\n"); |
| exit(-1); |
| } |
| memset(rec, 0, sizeof(*rec)); |
| |
| 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; |
| unsigned long end; |
| unsigned long ptr; |
| 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->leafsize; |
| } else { |
| num_bytes = key.offset; |
| } |
| |
| 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 |
| return add_extent_rec(extent_cache, NULL, 0, key.objectid, |
| num_bytes, refs, 0, 0, 0, metadata, 1, |
| num_bytes); |
| } |
| |
| ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); |
| refs = btrfs_extent_refs(eb, ei); |
| |
| add_extent_rec(extent_cache, NULL, 0, key.objectid, num_bytes, |
| refs, 0, 0, 0, metadata, 1, num_bytes); |
| |
| 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: |
| add_tree_backref(extent_cache, key.objectid, |
| 0, offset, 0); |
| break; |
| case BTRFS_SHARED_BLOCK_REF_KEY: |
| add_tree_backref(extent_cache, key.objectid, |
| offset, 0, 0); |
| 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) { |
| kfree(logical); |
| return 0; |
| } |
| bytes -= stripe_len; |
| offset += stripe_len; |
| } else if (logical[nr] < offset) { |
| if (logical[nr] + stripe_len >= |
| offset + bytes) { |
| kfree(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) { |
| kfree(logical); |
| return ret; |
| } |
| |
| /* Now we continue with the right side */ |
| bytes = (offset + bytes) - |
| (logical[nr] + stripe_len); |
| offset = logical[nr] + stripe_len; |
| } |
| } |
| |
| kfree(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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| root = root->fs_info->extent_root; |
| |
| last = max_t(u64, cache->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
| |
| 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->leafsize; |
| 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->leafsize; |
| 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_free_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; |
| } |
| |
| 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); |
| } |
| |
| 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 isnt %Lu\n", |
| cache->key.objectid); |
| error++; |
| } |
| } |
| |
| return error ? -EINVAL : 0; |
| } |
| |
| static int read_extent_data(struct btrfs_root *root, char *data, |
| u64 logical, u64 *len, int mirror) |
| { |
| u64 offset = 0; |
| struct btrfs_multi_bio *multi = NULL; |
| struct btrfs_fs_info *info = root->fs_info; |
| struct btrfs_device *device; |
| int ret = 0; |
| u64 max_len = *len; |
| |
| ret = btrfs_map_block(&info->mapping_tree, READ, logical, len, |
| &multi, mirror, NULL); |
| if (ret) { |
| fprintf(stderr, "Couldn't map the block %llu\n", |
| logical + offset); |
| goto err; |
| } |
| device = multi->stripes[0].dev; |
| |
| if (device->fd == 0) |
| goto err; |
| if (*len > max_len) |
| *len = max_len; |
| |
| ret = pread64(device->fd, data, *len, multi->stripes[0].physical); |
| if (ret != *len) |
| ret = -EIO; |
| else |
| ret = 0; |
| err: |
| kfree(multi); |
| return ret; |
| } |
| |
| 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(NULL, (char *)data + tmp, |
| csum, root->sectorsize); |
| btrfs_csum_final(csum, (char *)&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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) { |
| fprintf(stderr, "Error allocing path\n"); |
| return -ENOMEM; |
| } |
| |
| 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_free_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 traveler, |
| * 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_free_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_free_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; |
| } |
| |
| key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| key.type = BTRFS_EXTENT_CSUM_KEY; |
| key.offset = 0; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error searching csum tree %d\n", ret); |
| btrfs_free_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_free_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; |
| } |
| |
| static int run_next_block(struct btrfs_trans_handle *trans, |
| 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 btrfs_root_item *ri) |
| { |
| struct extent_buffer *buf; |
| 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) { |
| struct extent_record *rec; |
| |
| 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); |
| |
| /* |
| * FIXME, this only works only if we don't have any full |
| * backref mode. |
| */ |
| if (!init_extent_tree) { |
| ret = btrfs_lookup_extent_info(NULL, root, bytenr, |
| btrfs_header_level(buf), 1, NULL, |
| &flags); |
| if (ret < 0) |
| flags = 0; |
| } else { |
| flags = 0; |
| } |
| |
| if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { |
| parent = bytenr; |
| owner = 0; |
| } else { |
| parent = 0; |
| owner = btrfs_header_owner(buf); |
| } |
| |
| ret = check_block(trans, 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); |
| 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) { |
| add_tree_backref(extent_cache, key.objectid, 0, |
| key.offset, 0); |
| continue; |
| } |
| if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| add_tree_backref(extent_cache, key.objectid, |
| key.offset, 0, 0); |
| 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++) { |
| ptr = btrfs_node_blockptr(buf, i); |
| size = btrfs_level_size(root, level - 1); |
| btrfs_node_key_to_cpu(buf, &key, i); |
| if (ri != NULL) { |
| struct btrfs_key drop_key; |
| btrfs_disk_key_to_cpu(&drop_key, |
| &ri->drop_progress); |
| if ((level == ri->drop_level) |
| && is_dropped_key(&key, &drop_key)) { |
| continue; |
| } |
| } |
| ret = add_extent_rec(extent_cache, &key, |
| btrfs_node_ptr_generation(buf, i), |
| ptr, size, 0, 0, 1, 0, 1, 0, |
| size); |
| BUG_ON(ret); |
| |
| add_tree_backref(extent_cache, ptr, parent, owner, 1); |
| |
| 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, |
| struct btrfs_key *root_key) |
| { |
| if (btrfs_header_level(buf) > 0) |
| add_pending(nodes, seen, buf->start, buf->len); |
| else |
| add_pending(pending, seen, buf->start, buf->len); |
| add_extent_rec(extent_cache, NULL, 0, buf->start, buf->len, |
| 0, 1, 1, 0, 1, 0, buf->len); |
| |
| if (root_key->objectid == BTRFS_TREE_RELOC_OBJECTID || |
| btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV) |
| add_tree_backref(extent_cache, buf->start, buf->start, |
| 0, 1); |
| else |
| add_tree_backref(extent_cache, buf->start, 0, |
| root_key->objectid, 1); |
| return 0; |
| } |
| |
| /* 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, u64 new_len) |
| { |
| 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->leafsize; |
| |
| 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; |
| struct btrfs_root *extent_root = info->extent_root; |
| struct extent_buffer *leaf; |
| struct btrfs_key ins_key; |
| struct btrfs_extent_item *ei; |
| struct tree_backref *tback; |
| 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->leafsize); |
| |
| 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;; |
| |
| tback = (struct tree_backref *)back; |
| 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 = (struct 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; |
| |
| tback = (struct 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, tback->parent, tback->root); |
| } |
| if (ret) |
| goto fail; |
| fail: |
| btrfs_release_path(path); |
| return ret; |
| } |
| |
| struct extent_entry { |
| u64 bytenr; |
| u64 bytes; |
| int count; |
| int broken; |
| struct list_head list; |
| }; |
| |
| 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 (!prev) { |
| prev = entry; |
| continue; |
| } |
| |
| /* |
| * If there are as many broken entries as entries then we know |
| * not to trust this particular entry. |
| */ |
| if (entry->broken == entry->count) |
| 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_trans_handle *trans, |
| struct btrfs_fs_info *info, struct btrfs_path *path, |
| struct data_backref *dback, struct extent_entry *entry) |
| { |
| struct btrfs_root *root; |
| struct btrfs_file_extent_item *fi; |
| struct extent_buffer *leaf; |
| struct btrfs_key key; |
| u64 bytenr, bytes; |
| int ret; |
| |
| 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); |
| |
| /* |
| * Have to make sure that this root gets updated when we commit the |
| * transaction |
| */ |
| record_root_in_trans(trans, root); |
| |
| /* |
| * 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); |
| return ret; |
| } |
| if (ret > 0) { |
| fprintf(stderr, "Well that's odd, we just found this key " |
| "[%Lu, %u, %Lu]\n", key.objectid, key.type, |
| key.offset); |
| return -EINVAL; |
| } |
| 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); |
| return -EINVAL; |
| } |
| |
| 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); |
| return -EINVAL; |
| } |
| 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); |
| return -EINVAL; |
| } |
| |
| 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); |
| btrfs_release_path(path); |
| return 0; |
| } |
| |
| static int verify_backrefs(struct btrfs_trans_handle *trans, |
| 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 = (struct 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 = (struct 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(trans, 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 btrfs_root *root, |
| 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 = list_entry(rec->dups.next, struct extent_record, list); |
| 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_trans_handle *trans, |
| struct btrfs_root *root, |
| struct extent_record *rec) |
| { |
| LIST_HEAD(delete_list); |
| struct btrfs_path *path; |
| struct extent_record *tmp, *good, *n; |
| int nr_del = 0; |
| int ret = 0; |
| struct btrfs_key key; |
| |
| path = btrfs_alloc_path(); |
| if (!path) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| 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 eachother, 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; |
| 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; |
| goto out; |
| } |
| ret = btrfs_del_item(trans, root, path); |
| if (ret) |
| goto out; |
| btrfs_release_path(path); |
| nr_del++; |
| } |
| |
| out: |
| while (!list_empty(&delete_list)) { |
| tmp = list_entry(delete_list.next, struct extent_record, list); |
| list_del_init(&tmp->list); |
| if (tmp == rec) |
| continue; |
| free(tmp); |
| } |
| |
| while (!list_empty(&rec->dups)) { |
| tmp = list_entry(rec->dups.next, struct extent_record, list); |
| list_del_init(&tmp->list); |
| free(tmp); |
| } |
| |
| btrfs_free_path(path); |
| |
| if (!ret && !nr_del) |
| rec->num_duplicates = 0; |
| |
| return ret ? ret : nr_del; |
| } |
| |
| static int find_possible_backrefs(struct btrfs_trans_handle *trans, |
| 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 = (struct 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; |
| } |
| |
| /* |
| * 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_trans_handle *trans, |
| struct btrfs_fs_info *info, |
| struct cache_tree *extent_cache, |
| struct extent_record *rec) |
| { |
| 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; |
| |
| /* |
| * remember our flags for recreating the extent. |
| * FIXME, if we have cleared extent tree, we can not |
| * lookup extent info in extent tree. |
| */ |
| if (!init_extent_tree) { |
| ret = btrfs_lookup_extent_info(NULL, info->extent_root, |
| rec->start, rec->max_size, |
| rec->metadata, NULL, &flags); |
| if (ret < 0) |
| flags = 0; |
| } else { |
| flags = 0; |
| } |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| 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(trans, info, path, extent_cache, |
| rec); |
| if (ret < 0) |
| goto out; |
| } |
| |
| /* step one, make sure all of the backrefs agree */ |
| ret = verify_backrefs(trans, info, path, rec); |
| if (ret < 0) |
| goto out; |
| |
| /* step two, delete all the existing records */ |
| ret = delete_extent_records(trans, info->extent_root, path, |
| rec->start, rec->max_size); |
| |
| 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 = list_entry(cur, struct extent_backref, list); |
| cur = cur->next; |
| |
| /* |
| * if we didn't find any references, don't create a |
| * new extent record |
| */ |
| if (!back->found_ref) |
| continue; |
| |
| ret = record_extent(trans, info, path, rec, back, allocated, flags); |
| allocated = 1; |
| |
| if (ret) |
| goto out; |
| } |
| out: |
| btrfs_free_path(path); |
| 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(trans, info->extent_root, &path, level, slot); |
| |
| out: |
| btrfs_release_path(&path); |
| return ret; |
| } |
| |
| static int prune_corrupt_blocks(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *info) |
| { |
| struct cache_extent *cache; |
| struct btrfs_corrupt_block *corrupt; |
| |
| cache = search_cache_extent(info->corrupt_blocks, 0); |
| while (1) { |
| if (!cache) |
| break; |
| corrupt = container_of(cache, struct btrfs_corrupt_block, cache); |
| prune_one_block(trans, info, corrupt); |
| cache = next_cache_extent(cache); |
| } |
| 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); |
| |
| 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, |
| GFP_NOFS); |
| } |
| |
| 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_trans_handle *trans, |
| struct btrfs_root *root, |
| struct cache_tree *extent_cache) |
| { |
| struct extent_record *rec; |
| struct cache_extent *cache; |
| int err = 0; |
| int ret = 0; |
| int fixed = 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); |
| btrfs_pin_extent(root->fs_info, |
| rec->start, rec->max_size); |
| cache = next_cache_extent(cache); |
| } |
| |
| /* pin down all the corrupted blocks too */ |
| cache = search_cache_extent(root->fs_info->corrupt_blocks, 0); |
| while(cache) { |
| btrfs_pin_extent(root->fs_info, |
| cache->start, cache->size); |
| cache = next_cache_extent(cache); |
| } |
| prune_corrupt_blocks(trans, 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 = list_entry(duplicate_extents.next, struct extent_record, |
| list); |
| 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(root, extent_cache, rec)) |
| continue; |
| ret = delete_duplicate_records(trans, 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) { |
| fixed = 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); |
| 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); |
| if (!fixed && repair) { |
| ret = fixup_extent_refs(trans, root->fs_info, |
| extent_cache, rec); |
| if (ret) |
| goto repair_abort; |
| fixed = 1; |
| } |
| 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); |
| |
| if (!fixed && repair) { |
| ret = fixup_extent_refs(trans, root->fs_info, |
| extent_cache, rec); |
| if (ret) |
| goto repair_abort; |
| fixed = 1; |
| } |
| |
| 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); |
| if (!fixed && repair) { |
| ret = fixup_extent_refs(trans, root->fs_info, |
| extent_cache, rec); |
| if (ret) |
| goto repair_abort; |
| fixed = 1; |
| } |
| err = 1; |
| } |
| |
| remove_cache_extent(extent_cache, cache); |
| free_all_extent_backrefs(rec); |
| free(rec); |
| } |
| repair_abort: |
| if (repair) { |
| if (ret && ret != -EAGAIN) { |
| fprintf(stderr, "failed to repair damaged filesystem, aborting\n"); |
| exit(1); |
| } else if (!ret) { |
| btrfs_fix_block_accounting(trans, root); |
| } |
| if (err) |
| fprintf(stderr, "repaired damaged extent references\n"); |
| return ret; |
| } |
| return err; |
| } |
| |
| 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; |
| } |
| |
| 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 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 || |
| 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; |
| } |
| |
| 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, 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) { |
| ret = err; |
| if (bad) |
| list_add_tail(&chunk_rec->list, bad); |
| } else { |
| if (good) |
| list_add_tail(&chunk_rec->list, good); |
| } |
| |
| 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 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 cache_tree corrupt_blocks; |
| struct btrfs_path path; |
| struct btrfs_key key; |
| struct btrfs_key found_key; |
| int ret, err = 0; |
| u64 last = 0; |
| struct block_info *bits; |
| int bits_nr; |
| struct extent_buffer *leaf; |
| struct btrfs_trans_handle *trans = NULL; |
| int slot; |
| struct btrfs_root_item ri; |
| struct list_head dropping_trees; |
| |
| 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); |
| INIT_LIST_HEAD(&dropping_trees); |
| |
| if (repair) { |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| fprintf(stderr, "Error starting transaction\n"); |
| return PTR_ERR(trans); |
| } |
| 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); |
| } |
| |
| again: |
| add_root_to_pending(root->fs_info->tree_root->node, |
| &extent_cache, &pending, &seen, &nodes, |
| &root->fs_info->tree_root->root_key); |
| |
| add_root_to_pending(root->fs_info->chunk_root->node, |
| &extent_cache, &pending, &seen, &nodes, |
| &root->fs_info->chunk_root->root_key); |
| |
| btrfs_init_path(&path); |
| key.offset = 0; |
| key.objectid = 0; |
| btrfs_set_key_type(&key, 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 (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) { |
| unsigned long offset; |
| struct extent_buffer *buf; |
| |
| offset = btrfs_item_ptr_offset(leaf, path.slots[0]); |
| read_extent_buffer(leaf, &ri, offset, sizeof(ri)); |
| if (btrfs_disk_key_objectid(&ri.drop_progress) == 0) { |
| buf = read_tree_block(root->fs_info->tree_root, |
| btrfs_root_bytenr(&ri), |
| btrfs_level_size(root, |
| btrfs_root_level(&ri)), |
| 0); |
| if (!buf) { |
| ret = -EIO; |
| goto out; |
| } |
| add_root_to_pending(buf, &extent_cache, |
| &pending, &seen, &nodes, |
| &found_key); |
| free_extent_buffer(buf); |
| } else { |
| struct dropping_root_item_record *dri_rec; |
| dri_rec = malloc(sizeof(*dri_rec)); |
| if (!dri_rec) { |
| perror("malloc"); |
| exit(1); |
| } |
| memcpy(&dri_rec->ri, &ri, sizeof(ri)); |
| memcpy(&dri_rec->found_key, &found_key, |
| sizeof(found_key)); |
| list_add_tail(&dri_rec->list, &dropping_trees); |
| } |
| } |
| path.slots[0]++; |
| } |
| btrfs_release_path(&path); |
| while (1) { |
| ret = run_next_block(trans, 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) |
| break; |
| } |
| |
| while (!list_empty(&dropping_trees)) { |
| struct dropping_root_item_record *rec; |
| struct extent_buffer *buf; |
| rec = list_entry(dropping_trees.next, |
| struct dropping_root_item_record, list); |
| last = 0; |
| if (!bits) { |
| perror("realloc"); |
| exit(1); |
| } |
| buf = read_tree_block(root->fs_info->tree_root, |
| btrfs_root_bytenr(&rec->ri), |
| btrfs_level_size(root, |
| btrfs_root_level(&rec->ri)), 0); |
| if (!buf) { |
| ret = -EIO; |
| goto out; |
| } |
| add_root_to_pending(buf, &extent_cache, &pending, |
| &seen, &nodes, &rec->found_key); |
| while (1) { |
| ret = run_next_block(trans, root, bits, bits_nr, &last, |
| &pending, &seen, &reada, |
| &nodes, &extent_cache, |
| &chunk_cache, &dev_cache, |
| &block_group_cache, |
| &dev_extent_cache, |
| &rec->ri); |
| if (ret != 0) |
| break; |
| } |
| free_extent_buffer(buf); |
| list_del(&rec->list); |
| free(rec); |
| } |
| |
| if (ret >= 0) |
| ret = check_extent_refs(trans, root, &extent_cache); |
| if (ret == -EAGAIN) { |
| ret = btrfs_commit_transaction(trans, root); |
| if (ret) |
| goto out; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| ret = PTR_ERR(trans); |
| goto out; |
| } |
| |
| 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(root->fs_info, &extent_cache); |
| goto again; |
| } |
| |
| err = check_chunks(&chunk_cache, &block_group_cache, |
| &dev_extent_cache, NULL, NULL, 0); |
| if (err && !ret) |
| ret = err; |
| |
| err = check_devices(&dev_cache, &dev_extent_cache); |
| if (err && !ret) |
| ret = err; |
| |
| out: |
| if (trans) { |
| err = btrfs_commit_transaction(trans, root); |
| if (!ret) |
| ret = err; |
| } |
| if (repair) { |
| free_corrupt_blocks_tree(root->fs_info->corrupt_blocks); |
| root->fs_info->fsck_extent_cache = NULL; |
| root->fs_info->free_extent_hook = NULL; |
| root->fs_info->corrupt_blocks = 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); |
| return ret; |
| } |
| |
| 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, |
| btrfs_level_size(root, 0), |
| 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 leafsize; |
| 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); |
| |
| leafsize = btrfs_super_leafsize(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, |
| leafsize, 0); |
| if (!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, leafsize); |
| continue; |
| } |
| |
| tmp = read_tree_block(fs_info->extent_root, bytenr, |
| leafsize, 0); |
| if (!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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| 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_free_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_free_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), |
| GFP_NOFS); |
| 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_free_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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| 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"); |
| return PTR_ERR(root); |
| } |
| 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_free_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, BTRFS_FEATURE_INCOMPAT_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 reseting 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); |
| } |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| btrfs_free_path(path); |
| return PTR_ERR(trans); |
| } |
| |
| 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_free_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); |
| } |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| trans = btrfs_start_transaction(root, 1); |
| if (IS_ERR(trans)) { |
| btrfs_free_path(path); |
| return PTR_ERR(trans); |
| } |
| |
| 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_free_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(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; |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| 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_free_path(path); |
| return ret; |
| } |
| |
| buf = malloc(csum_root->sectorsize); |
| if (!buf) { |
| btrfs_free_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_free_path(path); |
| free(buf); |
| return ret; |
| } |
| |
| 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; |
| }; |
| |
| static struct cache_tree *roots_info_cache = NULL; |
| |
| 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); |
| 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); |
| } |
| |
| path = btrfs_alloc_path(); |
| if (!path) |
| return -ENOMEM; |
| |
| 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 *info; |
| |
| info = (struct btrfs_tree_block_info *)(ei + 1); |
| iref = (struct btrfs_extent_inline_ref *)(info + 1); |
| level = btrfs_tree_block_level(leaf, info); |
| } |
| |
| /* |
| * 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_free_path(path); |
| |
| return ret; |
| } |
| |
| static int maybe_repair_root_item(struct btrfs_fs_info *info, |
| 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 = NULL; |
| 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; |
| |
| ret = build_roots_info_cache(info); |
| if (ret) |
| goto out; |
| |
| path = btrfs_alloc_path(); |
| if (!path) { |
| ret = -ENOMEM; |
| 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; |
| |
| ret = maybe_repair_root_item(info, 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(); |
| if (path) |
| btrfs_free_path(path); |
| if (ret < 0) |
| return ret; |
| |
| return bad_roots; |
| } |
| |
| static struct option long_options[] = { |
| { "super", 1, NULL, 's' }, |
| { "repair", 0, NULL, 0 }, |
| { "init-csum-tree", 0, NULL, 0 }, |
| { "init-extent-tree", 0, NULL, 0 }, |
| { "check-data-csum", 0, NULL, 0 }, |
| { "backup", 0, NULL, 0 }, |
| { "subvol-extents", 1, NULL, 'E' }, |
| { "qgroup-report", 0, NULL, 'Q' }, |
| { NULL, 0, NULL, 0} |
| }; |
| |
| const char * const cmd_check_usage[] = { |
| "btrfs check [options] <device>", |
| "Check an unmounted btrfs filesystem.", |
| "", |
| "-s|--super <superblock> use this superblock copy", |
| "-b|--backup use the backup root copy", |
| "--repair try to repair the filesystem", |
| "--init-csum-tree create a new CRC tree", |
| "--init-extent-tree create a new extent tree", |
| "--check-data-csum verify checkums of data blocks", |
| "--qgroup-report print a report on qgroup consistency", |
| "--subvol-extents <subvolid> print subvolume extents and sharing state", |
| 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; |
| char uuidbuf[BTRFS_UUID_UNPARSED_SIZE]; |
| int ret; |
| u64 num; |
| int option_index = 0; |
| int init_csum_tree = 0; |
| int qgroup_report = 0; |
| enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_EXCLUSIVE; |
| |
| while(1) { |
| int c; |
| c = getopt_long(argc, argv, "as:b", long_options, |
| &option_index); |
| 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) { |
| fprintf(stderr, |
| "ERROR: super mirror should be less than: %d\n", |
| 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 '?': |
| case 'h': |
| usage(cmd_check_usage); |
| } |
| if (option_index == 1) { |
| printf("enabling repair mode\n"); |
| repair = 1; |
| ctree_flags |= OPEN_CTREE_WRITES; |
| } else if (option_index == 2) { |
| printf("Creating a new CRC tree\n"); |
| init_csum_tree = 1; |
| repair = 1; |
| ctree_flags |= OPEN_CTREE_WRITES; |
| } else if (option_index == 3) { |
| init_extent_tree = 1; |
| ctree_flags |= (OPEN_CTREE_WRITES | |
| OPEN_CTREE_NO_BLOCK_GROUPS); |
| repair = 1; |
| } else if (option_index == 4) { |
| check_data_csum = 1; |
| } |
| } |
| argc = argc - optind; |
| |
| if (check_argc_exact(argc, 1)) |
| usage(cmd_check_usage); |
| |
| radix_tree_init(); |
| cache_tree_init(&root_cache); |
| |
| if((ret = check_mounted(argv[optind])) < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret)); |
| goto err_out; |
| } else if(ret) { |
| fprintf(stderr, "%s is currently mounted. Aborting.\n", argv[optind]); |
| ret = -EBUSY; |
| 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, 0, ctree_flags); |
| if (!info) { |
| fprintf(stderr, "Couldn't open file system\n"); |
| ret = -EIO; |
| goto err_out; |
| } |
| |
| root = info->fs_root; |
| |
| ret = repair_root_items(info); |
| if (ret < 0) |
| 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; |
| 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; |
| goto close_out; |
| } |
| ret = zero_log_tree(root); |
| if (ret) { |
| fprintf(stderr, "fail to zero log tree\n"); |
| 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); |
| if (ret == 0) |
| print_qgroup_report(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); |
| 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)) { |
| fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n"); |
| 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)) { |
| fprintf(stderr, "Error starting transaction\n"); |
| ret = PTR_ERR(trans); |
| goto close_out; |
| } |
| |
| if (init_extent_tree) { |
| printf("Creating a new extent tree\n"); |
| ret = reinit_extent_tree(trans, info); |
| if (ret) |
| goto close_out; |
| } |
| |
| if (init_csum_tree) { |
| fprintf(stderr, "Reinit crc root\n"); |
| ret = btrfs_fsck_reinit_root(trans, info->csum_root, 0); |
| if (ret) { |
| fprintf(stderr, "crc root initialization failed\n"); |
| ret = -EIO; |
| goto close_out; |
| } |
| |
| ret = fill_csum_tree(trans, info->csum_root); |
| if (ret) { |
| fprintf(stderr, "crc refilling failed\n"); |
| 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); |
| if (ret) |
| goto close_out; |
| } |
| if (!extent_buffer_uptodate(info->extent_root->node)) { |
| fprintf(stderr, "Critical roots corrupted, unable to fsck the FS\n"); |
| ret = -EIO; |
| goto close_out; |
| } |
| if (!extent_buffer_uptodate(info->csum_root->node)) { |
| fprintf(stderr, "Checksum root corrupted, rerun with --init-csum-tree option\n"); |
| ret = -EIO; |
| goto close_out; |
| } |
| |
| fprintf(stderr, "checking extents\n"); |
| ret = check_chunks_and_extents(root); |
| if (ret) |
| fprintf(stderr, "Errors found in extent allocation tree or chunk allocation\n"); |
| |
| fprintf(stderr, "checking free space cache\n"); |
| ret = check_space_cache(root); |
| if (ret) |
| 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, |
| BTRFS_FEATURE_INCOMPAT_NO_HOLES); |
| fprintf(stderr, "checking fs roots\n"); |
| ret = check_fs_roots(root, &root_cache); |
| if (ret) |
| goto out; |
| |
| fprintf(stderr, "checking csums\n"); |
| ret = check_csums(root); |
| if (ret) |
| goto out; |
| |
| fprintf(stderr, "checking root refs\n"); |
| ret = check_root_refs(root, &root_cache); |
| if (ret) |
| 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); |
| if (ret) |
| 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); |
| free(bad); |
| } |
| |
| if (info->quota_enabled) { |
| int err; |
| fprintf(stderr, "checking quota groups\n"); |
| err = qgroup_verify_all(info); |
| if (err) |
| goto out; |
| } |
| |
| if (!list_empty(&root->fs_info->recow_ebs)) { |
| fprintf(stderr, "Transid errors in file system\n"); |
| ret = 1; |
| } |
| out: |
| print_qgroup_report(0); |
| 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"); |
| ret = 1; |
| } |
| printf("found %llu bytes used err is %d\n", |
| (unsigned long long)bytes_used, ret); |
| 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); |
| printf("%s\n", BTRFS_BUILD_VERSION); |
| |
| free_root_recs_tree(&root_cache); |
| close_out: |
| close_ctree(root); |
| err_out: |
| return ret; |
| } |