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btrfs-progs: check: verify dir item name and hash in lowmem mode 

Although lowmem mode can detect name and hash mismatch in dir_item,
it's done by checking inode_ref to expose such problem.

This patch will enhance dir_item check, by also comparing name and
hash when checking dir_items.

Reported-by: Filippe LeMarchand <gasinvein@gmail.com>
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Su Yue 2017-07-14 15:47:45 +08:00 committed by David Sterba
parent d4833d709b
commit 7f3ba48000
1 changed files with 9 additions and 0 deletions
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9
cmds-check.c
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@ -4680,6 +4680,15 @@ static int check_dir_item(struct btrfs_root *root, struct btrfs_key *key,
read_extent_buffer(node, namebuf, (unsigned long)(di + 1), len);
filetype = btrfs_dir_type(node, di);
if (key->type == BTRFS_DIR_ITEM_KEY &&
key->offset != btrfs_name_hash(namebuf, len)) {
err |= -EIO;
error("root %llu DIR_ITEM[%llu %llu] name %s namelen %u filetype %u mismatch with its hash, wanted %llu have %llu",
root->objectid, key->objectid, key->offset,
namebuf, len, filetype, key->offset,
btrfs_name_hash(namebuf, len));
}
btrfs_init_path(&path);
btrfs_dir_item_key_to_cpu(node, di, &location);