blob: 3a23e665676ff672c838f2f9deb1c3ca47e7e173 [file] [log] [blame]
/*
* 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/stat.h>
#include "kerncompat.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
#include "list.h"
#include "version.h"
#include "utils.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 btree_space_waste = 0;
static u64 data_bytes_allocated = 0;
static u64 data_bytes_referenced = 0;
static int found_old_backref = 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;
};
struct data_backref {
struct extent_backref node;
union {
u64 parent;
u64 root;
};
u64 owner;
u64 offset;
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 cache_extent cache;
struct btrfs_disk_key parent_key;
u64 start;
u64 nr;
u64 refs;
u64 extent_item_refs;
unsigned int content_checked:1;
unsigned int owner_ref_checked:1;
unsigned int is_root: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;
u64 dir;
u64 index;
u16 namelen;
char name[0];
};
#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;
};
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 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 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 = find_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;
ret = insert_existing_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 && (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 = find_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(root, &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 (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) {
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;
backref->index = index;
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,
BTRFS_INODE_REF_KEY, 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 = find_first_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_existing_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_recs(struct cache_tree *inode_cache)
{
struct cache_extent *cache;
struct ptr_node *node;
struct inode_record *rec;
while (1) {
cache = find_first_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);
free_inode_rec(rec);
}
}
static struct shared_node *find_shared_node(struct cache_tree *shared,
u64 bytenr)
{
struct cache_extent *cache;
struct shared_node *node;
cache = find_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_existing_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(&node->root_cache);
free_inode_recs(&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;
}
static int process_dir_item(struct extent_buffer *eb,
int slot, struct btrfs_key *key,
struct shared_node *active_node)
{
u32 total;
u32 cur = 0;
u32 len;
u32 name_len;
u32 data_len;
int error;
int nritems = 0;
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, "warning line %d\n", __LINE__);
}
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 u64 count_csum_range(struct btrfs_root *root, u64 start, u64 len)
{
struct btrfs_key key;
struct btrfs_path path;
struct extent_buffer *leaf;
int ret ;
size_t size;
u64 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);
BUG_ON(ret < 0);
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);
BUG_ON(ret < 0);
if (ret > 0)
break;
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]++;
}
btrfs_release_path(root->fs_info->csum_root, &path);
return found;
}
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;
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, 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;
found = count_csum_range(root, disk_bytenr, num_bytes);
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 (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(eb, i, &key, active_node);
break;
case BTRFS_INODE_REF_KEY:
ret = process_inode_ref(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 ret;
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);
ret = readahead_tree_block(root, bytenr, blocksize, ptr_gen);
if (ret)
break;
}
}
static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path,
struct walk_control *wc, int *level)
{
u64 bytenr;
u64 ptr_gen;
struct extent_buffer *next;
struct extent_buffer *cur;
u32 blocksize;
int ret;
u64 refs;
WARN_ON(*level < 0);
WARN_ON(*level >= BTRFS_MAX_LEVEL);
ret = btrfs_lookup_extent_info(NULL, root,
path->nodes[*level]->start,
path->nodes[*level]->len, &refs, NULL);
BUG_ON(ret);
if (refs > 1) {
ret = enter_shared_node(root, path->nodes[*level]->start,
refs, wc, *level);
if (ret > 0)
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);
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, blocksize,
&refs, NULL);
BUG_ON(ret);
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);
}
*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 0;
}
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 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 ret;
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;
}
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 = find_first_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;
}
}
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;
fprintf(stderr, "root %llu inode %llu errors %x\n",
(unsigned long long) root->root_key.objectid,
(unsigned long long) rec->ino, rec->errors);
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 error %x\n",
(unsigned long long)backref->dir,
(unsigned long long)backref->index,
backref->namelen, backref->name,
backref->filetype, 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 = find_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_existing_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_recs(struct cache_tree *root_cache)
{
struct cache_extent *cache;
struct root_record *rec;
struct root_backref *backref;
while (1) {
cache = find_first_cache_extent(root_cache, 0);
if (!cache)
break;
rec = container_of(cache, struct root_record, cache);
remove_cache_extent(root_cache, &rec->cache);
while (!list_empty(&rec->backrefs)) {
backref = list_entry(rec->backrefs.next,
struct root_backref, list);
list_del(&backref->list);
free(backref);
}
kfree(rec);
}
}
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) {
backref->found_dir_item = 1;
backref->reachable = 1;
rec->found_ref++;
} 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;
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);
}
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;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
free_inode_recs(src_cache);
return 0;
}
while (1) {
cache = find_first_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);
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);
}
free_inode_rec(rec);
}
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 = find_first_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 = find_first_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;
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 error %x\n",
(unsigned long long)backref->ref_root,
(unsigned long long)backref->dir,
(unsigned long long)backref->index,
backref->namelen, backref->name,
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 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;
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;
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);
BUG_ON(wret < 0);
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;
}
btrfs_release_path(root, &path);
merge_root_recs(root, &root_node.root_cache, root_cache);
if (root_node.current) {
root_node.current->checked = 1;
maybe_free_inode_rec(&root_node.inode_cache,
root_node.current);
}
ret = check_inode_recs(root, &root_node.inode_cache);
return ret;
}
static int fs_root_objectid(u64 objectid)
{
if (objectid == BTRFS_FS_TREE_OBJECTID ||
objectid == BTRFS_TREE_RELOC_OBJECTID ||
objectid == BTRFS_DATA_RELOC_TREE_OBJECTID ||
(objectid >= BTRFS_FIRST_FREE_OBJECTID &&
objectid <= BTRFS_LAST_FREE_OBJECTID))
return 1;
return 0;
}
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;
struct btrfs_root *tmp_root;
struct btrfs_root *tree_root = root->fs_info->tree_root;
int ret;
int err = 0;
memset(&wc, 0, sizeof(wc));
cache_tree_init(&wc.shared);
btrfs_init_path(&path);
key.offset = 0;
key.objectid = 0;
key.type = BTRFS_ROOT_ITEM_KEY;
ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
BUG_ON(ret < 0);
while (1) {
leaf = path.nodes[0];
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(tree_root, &path);
if (ret != 0)
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)) {
tmp_root = btrfs_read_fs_root_no_cache(root->fs_info,
&key);
ret = check_fs_root(tmp_root, root_cache, &wc);
if (ret)
err = 1;
btrfs_free_fs_root(root->fs_info, 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);
}
path.slots[0]++;
}
btrfs_release_path(tree_root, &path);
if (!cache_tree_empty(&wc.shared))
fprintf(stderr, "warning line %d\n", __LINE__);
return err;
}
static int check_node(struct btrfs_root *root,
struct btrfs_disk_key *parent_key,
struct extent_buffer *buf)
{
int i;
struct btrfs_key cpukey;
struct btrfs_disk_key key;
u32 nritems = btrfs_header_nritems(buf);
if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(root))
return 1;
if (parent_key->type) {
btrfs_node_key(buf, &key, 0);
if (memcmp(parent_key, &key, sizeof(key)))
return 1;
}
for (i = 0; nritems > 1 && i < nritems - 2; i++) {
btrfs_node_key(buf, &key, i);
btrfs_node_key_to_cpu(buf, &cpukey, i + 1);
if (btrfs_comp_keys(&key, &cpukey) >= 0)
return 1;
}
return 0;
}
static int check_leaf(struct btrfs_root *root,
struct btrfs_disk_key *parent_key,
struct extent_buffer *buf)
{
int i;
struct btrfs_key cpukey;
struct btrfs_disk_key key;
u32 nritems = btrfs_header_nritems(buf);
if (btrfs_header_level(buf) != 0) {
fprintf(stderr, "leaf is not a leaf %llu\n",
(unsigned long long)btrfs_header_bytenr(buf));
return 1;
}
if (btrfs_leaf_free_space(root, buf) < 0) {
fprintf(stderr, "leaf free space incorrect %llu %d\n",
(unsigned long long)btrfs_header_bytenr(buf),
btrfs_leaf_free_space(root, buf));
return 1;
}
if (nritems == 0)
return 0;
btrfs_item_key(buf, &key, 0);
if (parent_key->type && memcmp(parent_key, &key, sizeof(key))) {
fprintf(stderr, "leaf parent key incorrect %llu\n",
(unsigned long long)btrfs_header_bytenr(buf));
return 1;
}
for (i = 0; nritems > 1 && i < nritems - 2; i++) {
btrfs_item_key(buf, &key, i);
btrfs_item_key_to_cpu(buf, &cpukey, i + 1);
if (btrfs_comp_keys(&key, &cpukey) >= 0) {
fprintf(stderr, "bad key ordering %d %d\n", i, i+1);
return 1;
}
if (btrfs_item_offset_nr(buf, i) !=
btrfs_item_end_nr(buf, i + 1)) {
fprintf(stderr, "incorrect offsets %u %u\n",
btrfs_item_offset_nr(buf, i),
btrfs_item_end_nr(buf, i + 1));
return 1;
}
if (i == 0 && btrfs_item_end_nr(buf, i) !=
BTRFS_LEAF_DATA_SIZE(root)) {
fprintf(stderr, "bad item end %u wanted %u\n",
btrfs_item_end_nr(buf, i),
(unsigned)BTRFS_LEAF_DATA_SIZE(root));
return 1;
}
}
return 0;
}
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\n",
(unsigned long long)rec->start,
back->full_backref ? "parent" : "root",
back->full_backref ?
(unsigned long long)tback->parent :
(unsigned long long)tback->root);
}
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\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);
}
}
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 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 &&
!all_backpointers_checked(rec, 0)) {
remove_cache_extent(extent_cache, &rec->cache);
free_all_extent_backrefs(rec);
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;
int level;
int found = 0;
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);
BUG_ON(IS_ERR(ref_root));
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;
btrfs_search_slot(NULL, ref_root, &key, &path, 0, 0);
if (buf->start == btrfs_node_blockptr(path.nodes[level + 1],
path.slots[level + 1]))
rec->owner_ref_checked = 1;
btrfs_release_path(ref_root, &path);
return found ? 0 : 1;
}
static int check_block(struct btrfs_root *root,
struct cache_tree *extent_cache,
struct extent_buffer *buf, u64 flags)
{
struct extent_record *rec;
struct cache_extent *cache;
int ret = 1;
cache = find_cache_extent(extent_cache, buf->start, buf->len);
if (!cache)
return 1;
rec = container_of(cache, struct extent_record, cache);
if (btrfs_is_leaf(buf)) {
ret = check_leaf(root, &rec->parent_key, buf);
} else {
ret = check_node(root, &rec->parent_key, buf);
}
if (ret) {
fprintf(stderr, "bad block %llu\n",
(unsigned long long)buf->start);
} 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)
{
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)
return back;
}
}
return NULL;
}
static struct data_backref *alloc_data_backref(struct extent_record *rec,
u64 parent, u64 root,
u64 owner, u64 offset)
{
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->found_ref = 0;
ref->num_refs = 0;
list_add_tail(&ref->node.list, &rec->backrefs);
return ref;
}
static int add_extent_rec(struct cache_tree *extent_cache,
struct btrfs_key *parent_key,
u64 start, u64 nr, u64 extent_item_refs,
int is_root, int inc_ref, int set_checked)
{
struct extent_record *rec;
struct cache_extent *cache;
int ret = 0;
cache = find_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 = nr;
if (start != rec->start) {
fprintf(stderr, "warning, start mismatch %llu %llu\n",
(unsigned long long)rec->start,
(unsigned long long)start);
ret = 1;
}
if (extent_item_refs) {
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);
maybe_free_extent_rec(extent_cache, rec);
return ret;
}
rec = malloc(sizeof(*rec));
rec->start = start;
rec->nr = nr;
rec->content_checked = 0;
rec->owner_ref_checked = 0;
INIT_LIST_HEAD(&rec->backrefs);
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));
rec->cache.start = start;
rec->cache.size = nr;
ret = insert_existing_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 = find_cache_extent(extent_cache, bytenr, 1);
if (!cache) {
add_extent_rec(extent_cache, NULL, bytenr, 1, 0, 0, 0, 0);
cache = find_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;
}
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)
{
struct extent_record *rec;
struct data_backref *back;
struct cache_extent *cache;
cache = find_cache_extent(extent_cache, bytenr, 1);
if (!cache) {
add_extent_rec(extent_cache, NULL, bytenr, 1, 0, 0, 0, 0);
cache = find_cache_extent(extent_cache, bytenr, 1);
if (!cache)
abort();
}
rec = container_of(cache, struct extent_record, cache);
if (rec->start != bytenr) {
abort();
}
back = find_data_backref(rec, parent, root, owner, offset);
if (!back)
back = alloc_data_backref(rec, parent, root, owner, offset);
if (found_ref) {
BUG_ON(num_refs != 1);
back->node.found_ref = 1;
back->found_ref += 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;
}
return 0;
}
static int add_pending(struct cache_tree *pending,
struct cache_tree *seen, u64 bytenr, u32 size)
{
int ret;
ret = insert_cache_extent(seen, bytenr, size);
if (ret)
return ret;
insert_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 = find_first_cache_extent(reada, 0);
if (cache) {
bits[0].start = cache->start;
bits[1].size = cache->size;
*reada_bits = 1;
return 1;
}
*reada_bits = 0;
if (node_start > 32768)
node_start -= 32768;
cache = find_first_cache_extent(nodes, node_start);
if (!cache)
cache = find_first_cache_extent(nodes, 0);
if (!cache) {
cache = find_first_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 = find_first_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;
}
#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);
}
return 0;
}
#endif
static int process_extent_item(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;
btrfs_item_key_to_cpu(eb, &key, slot);
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, key.objectid,
key.offset, refs, 0, 0, 0);
}
ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
refs = btrfs_extent_refs(eb, ei);
add_extent_rec(extent_cache, NULL, key.objectid, key.offset,
refs, 0, 0, 0);
ptr = (unsigned long)(ei + 1);
if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK)
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);
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);
break;
default:
BUG();
}
ptr += btrfs_extent_inline_ref_size(type);
}
WARN_ON(ptr > end);
return 0;
}
static int run_next_block(struct btrfs_root *root,
struct block_info *bits,
int bits_nr,
u64 *last,
struct cache_tree *pending,
struct cache_tree *seen,
struct cache_tree *reada,
struct cache_tree *nodes,
struct cache_tree *extent_cache)
{
struct extent_buffer *buf;
u64 bytenr;
u32 size;
u64 parent;
u64 owner;
u64 flags;
int ret;
int i;
int nritems;
struct btrfs_key key;
struct cache_extent *cache;
int reada_bits;
ret = pick_next_pending(pending, reada, nodes, *last, bits,
bits_nr, &reada_bits);
if (ret == 0) {
return 1;
}
if (!reada_bits) {
for(i = 0; i < ret; i++) {
insert_cache_extent(reada, bits[i].start,
bits[i].size);
/* 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 = find_cache_extent(pending, bytenr, size);
if (cache) {
remove_cache_extent(pending, cache);
free(cache);
}
cache = find_cache_extent(reada, bytenr, size);
if (cache) {
remove_cache_extent(reada, cache);
free(cache);
}
cache = find_cache_extent(nodes, bytenr, size);
if (cache) {
remove_cache_extent(nodes, cache);
free(cache);
}
/* fixme, get the real parent transid */
buf = read_tree_block(root, bytenr, size, 0);
nritems = btrfs_header_nritems(buf);
ret = btrfs_lookup_extent_info(NULL, root, bytenr, size, NULL, &flags);
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
parent = bytenr;
owner = 0;
} else {
parent = 0;
owner = btrfs_header_owner(buf);
}
ret = check_block(root, extent_cache, buf, flags);
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(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_BLOCK_GROUP_ITEM_KEY) {
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;