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btrfs: tree-checker: Add check for INODE_REF 

For INODE_REF we will check:
- Objectid (ino) against previous key
  To detect missing INODE_ITEM.

- No overflow/padding in the data payload
  Much like DIR_ITEM, but with less members to check.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-08-26 15:40:39 +08:00 committed by David Sterba
parent c18679ebd8
commit 71bf92a9b8
1 changed files with 53 additions and 0 deletions
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53
fs/btrfs/tree-checker.c
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@ -1247,6 +1247,56 @@ static int check_extent_data_ref(struct extent_buffer *leaf,
return 0;
}
#define inode_ref_err(fs_info, eb, slot, fmt, args...) \
inode_item_err(fs_info, eb, slot, fmt, ##args)
static int check_inode_ref(struct extent_buffer *leaf,
struct btrfs_key *key, struct btrfs_key *prev_key,
int slot)
{
struct btrfs_inode_ref *iref;
unsigned long ptr;
unsigned long end;
/* namelen can't be 0, so item_size == sizeof() is also invalid */
if (btrfs_item_size_nr(leaf, slot) <= sizeof(*iref)) {
inode_ref_err(fs_info, leaf, slot,
"invalid item size, have %u expect (%zu, %u)",
btrfs_item_size_nr(leaf, slot),
sizeof(*iref), BTRFS_LEAF_DATA_SIZE(leaf->fs_info));
return -EUCLEAN;
}
ptr = btrfs_item_ptr_offset(leaf, slot);
end = ptr + btrfs_item_size_nr(leaf, slot);
while (ptr < end) {
u16 namelen;
if (ptr + sizeof(iref) > end) {
inode_ref_err(fs_info, leaf, slot,
"inode ref overflow, ptr %lu end %lu inode_ref_size %zu",
ptr, end, sizeof(iref));
return -EUCLEAN;
}
iref = (struct btrfs_inode_ref *)ptr;
namelen = btrfs_inode_ref_name_len(leaf, iref);
if (ptr + sizeof(*iref) + namelen > end) {
inode_ref_err(fs_info, leaf, slot,
"inode ref overflow, ptr %lu end %lu namelen %u",
ptr, end, namelen);
return -EUCLEAN;
}
/*
* NOTE: In theory we should record all found index numbers
* to find any duplicated indexes, but that will be too time
* consuming for inodes with too many hard links.
*/
ptr += sizeof(*iref) + namelen;
}
return 0;
}
/*
* Common point to switch the item-specific validation.
*/
@ -1269,6 +1319,9 @@ static int check_leaf_item(struct extent_buffer *leaf,
case BTRFS_XATTR_ITEM_KEY:
ret = check_dir_item(leaf, key, prev_key, slot);
break;
case BTRFS_INODE_REF_KEY:
ret = check_inode_ref(leaf, key, prev_key, slot);
break;
case BTRFS_BLOCK_GROUP_ITEM_KEY:
ret = check_block_group_item(leaf, key, slot);
break;