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btrfs-progs: check: introduce function to check inode_extref

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Introduce a new function check_inode_extref() to check INODE_EXTREF, and
call find_dir_item() to find the related DIR_ITEM/DIR_INDEX.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Lu Fengqi 2016-07-26 14:00:01 +08:00 committed by David Sterba
parent 6c9569fac2
commit ec7b85da52
1 changed files with 78 additions and 0 deletions
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78
cmds-check.c
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@ -4041,6 +4041,84 @@ next:
return err;
}
/*
* Traverse the given INODE_EXTREF and call find_dir_item() to find related
* DIR_ITEM/DIR_INDEX.
*
* @root: the root of the fs/file tree
* @ref_key: the key of the INODE_EXTREF
* @refs: the count of INODE_EXTREF
* @mode: the st_mode of INODE_ITEM
*
* Return 0 if no error occurred.
*/
static int check_inode_extref(struct btrfs_root *root,
struct btrfs_key *ref_key,
struct extent_buffer *node, int slot, u64 *refs,
int mode)
{
struct btrfs_key key;
struct btrfs_inode_extref *extref;
char namebuf[BTRFS_NAME_LEN] = {0};
u32 total;
u32 cur = 0;
u32 len;
u32 name_len;
u64 index;
u64 parent;
int ret;
int err = 0;
extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref);
total = btrfs_item_size_nr(node, slot);
next:
/* update inode ref count */
(*refs)++;
name_len = btrfs_inode_extref_name_len(node, extref);
index = btrfs_inode_extref_index(node, extref);
parent = btrfs_inode_extref_parent(node, extref);
if (name_len <= BTRFS_NAME_LEN) {
len = name_len;
} else {
len = BTRFS_NAME_LEN;
warning("root %llu INODE_EXTREF[%llu %llu] name too long",
root->objectid, ref_key->objectid, ref_key->offset);
}
read_extent_buffer(node, namebuf, (unsigned long)(extref + 1), len);
/* Check root dir ref name */
if (index == 0 && strncmp(namebuf, "..", name_len)) {
error("root %llu INODE_EXTREF[%llu %llu] ROOT_DIR name shouldn't be %s",
root->objectid, ref_key->objectid, ref_key->offset,
namebuf);
err |= ROOT_DIR_ERROR;
}
/* find related dir_index */
key.objectid = parent;
key.type = BTRFS_DIR_INDEX_KEY;
key.offset = index;
ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode);
err |= ret;
/* find related dir_item */
key.objectid = parent;
key.type = BTRFS_DIR_ITEM_KEY;
key.offset = btrfs_name_hash(namebuf, len);
ret = find_dir_item(root, ref_key, &key, index, namebuf, len, mode);
err |= ret;
len = sizeof(*extref) + name_len;
extref = (struct btrfs_inode_extref *)((char *)extref + len);
cur += len;
if (cur < total)
goto next;
return err;
}
static int all_backpointers_checked(struct extent_record *rec, int print_errs)
{
struct list_head *cur = rec->backrefs.next;