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btrfs-progs: check: introduce function to find inode_ref

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Introduce a new function find_inode_ref() to find
INODE_REF/INODE_EXTREF for the given key, and check it with the
specified DIR_ITEM/DIR_INDEX match.

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 2016-07-25 13:12:35 +08:00 committed by David Sterba
parent ec7b85da52
commit cf4ada1f13
1 changed files with 149 additions and 0 deletions
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149
cmds-check.c
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@ -3830,6 +3830,7 @@ out:
#define ROOT_DIR_ERROR (1<<1) /* bad ROOT_DIR */
#define DIR_ITEM_MISSING (1<<2) /* DIR_ITEM not found */
#define DIR_ITEM_MISMATCH (1<<3) /* DIR_ITEM found but not match */
#define INODE_REF_MISSING (1<<4) /* INODE_REF/INODE_EXTREF not found */
/*
* Find DIR_ITEM/DIR_INDEX for the given key and check it with the specified
@ -4119,6 +4120,154 @@ next:
return err;
}
/*
* Find INODE_REF/INODE_EXTREF for the given key and check it with the specified
* DIR_ITEM/DIR_INDEX match.
*
* @root: the root of the fs/file tree
* @key: the key of the INODE_REF/INODE_EXTREF
* @name: the name in the INODE_REF/INODE_EXTREF
* @namelen: the length of name in the INODE_REF/INODE_EXTREF
* @index: the index in the INODE_REF/INODE_EXTREF, for DIR_ITEM set index
* to (u64)-1
* @ext_ref: the EXTENDED_IREF feature
*
* Return 0 if no error occurred.
* Return >0 for error bitmap
*/
static int find_inode_ref(struct btrfs_root *root, struct btrfs_key *key,
char *name, int namelen, u64 index,
unsigned int ext_ref)
{
struct btrfs_path path;
struct btrfs_inode_ref *ref;
struct btrfs_inode_extref *extref;
struct extent_buffer *node;
char ref_namebuf[BTRFS_NAME_LEN] = {0};
u32 total;
u32 cur = 0;
u32 len;
u32 ref_namelen;
u64 ref_index;
u64 parent;
u64 dir_id;
int slot;
int ret;
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
if (ret) {
ret = INODE_REF_MISSING;
goto extref;
}
node = path.nodes[0];
slot = path.slots[0];
ref = btrfs_item_ptr(node, slot, struct btrfs_inode_ref);
total = btrfs_item_size_nr(node, slot);
/* Iterate all entry of INODE_REF */
while (cur < total) {
ret = INODE_REF_MISSING;
ref_namelen = btrfs_inode_ref_name_len(node, ref);
ref_index = btrfs_inode_ref_index(node, ref);
if (index != (u64)-1 && index != ref_index)
goto next_ref;
if (ref_namelen <= BTRFS_NAME_LEN) {
len = ref_namelen;
} else {
len = BTRFS_NAME_LEN;
warning("root %llu INODE %s[%llu %llu] name too long",
root->objectid,
key->type == BTRFS_INODE_REF_KEY ?
"REF" : "EXTREF",
key->objectid, key->offset);
}
read_extent_buffer(node, ref_namebuf, (unsigned long)(ref + 1),
len);
if (len != namelen || strncmp(ref_namebuf, name, len))
goto next_ref;
ret = 0;
goto out;
next_ref:
len = sizeof(*ref) + ref_namelen;
ref = (struct btrfs_inode_ref *)((char *)ref + len);
cur += len;
}
extref:
/* Skip if not support EXTENDED_IREF feature */
if (!ext_ref)
goto out;
btrfs_release_path(&path);
btrfs_init_path(&path);
dir_id = key->offset;
key->type = BTRFS_INODE_EXTREF_KEY;
key->offset = btrfs_extref_hash(dir_id, name, namelen);
ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
if (ret) {
ret = INODE_REF_MISSING;
goto out;
}
node = path.nodes[0];
slot = path.slots[0];
extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref);
cur = 0;
total = btrfs_item_size_nr(node, slot);
/* Iterate all entry of INODE_EXTREF */
while (cur < total) {
ret = INODE_REF_MISSING;
ref_namelen = btrfs_inode_extref_name_len(node, extref);
ref_index = btrfs_inode_extref_index(node, extref);
parent = btrfs_inode_extref_parent(node, extref);
if (index != (u64)-1 && index != ref_index)
goto next_extref;
if (parent != dir_id)
goto next_extref;
if (ref_namelen <= BTRFS_NAME_LEN) {
len = ref_namelen;
} else {
len = BTRFS_NAME_LEN;
warning("Warning: root %llu INODE %s[%llu %llu] name too long\n",
root->objectid,
key->type == BTRFS_INODE_REF_KEY ?
"REF" : "EXTREF",
key->objectid, key->offset);
}
read_extent_buffer(node, ref_namebuf,
(unsigned long)(extref + 1), len);
if (len != namelen || strncmp(ref_namebuf, name, len))
goto next_extref;
ret = 0;
goto out;
next_extref:
len = sizeof(*extref) + ref_namelen;
extref = (struct btrfs_inode_extref *)((char *)extref + len);
cur += len;
}
out:
btrfs_release_path(&path);
return ret;
}
static int all_backpointers_checked(struct extent_record *rec, int print_errs)
{
struct list_head *cur = rec->backrefs.next;