btrfs: fix invalid extref key setup when replaying dentry

[ Upstream commit b62fd63ade7cb573b114972ef8f9fa505be8d74a ]

The offset for an extref item's key is not the object ID of the parent
dir, otherwise we would not need the extref item and would use plain ref
items. Instead the offset is the result of a hash computation that uses
the object ID of the parent dir and the name associated to the entry.
So fix this by setting the key offset at replay_one_name() to be the
result of calling btrfs_extref_hash().

Fixes: 725af92a6251 ("btrfs: Open-code name_in_log_ref in replay_one_name")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index f917fdae7e672ba6dea9432bee53fda54e3d1ebc..0022ad003791f47b796d0762ffe0b505b4799f98 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1946,7 +1946,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
 
        search_key.objectid = log_key.objectid;
        search_key.type = BTRFS_INODE_EXTREF_KEY;
-       search_key.offset = key->objectid;
+       search_key.offset = btrfs_extref_hash(key->objectid, name.name, name.len);
        ret = backref_in_log(root->log_root, &search_key, key->objectid, &name);
        if (ret < 0) {
                goto out;