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Btrfs: bugfix in btrfs_find_parent_nodes

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That one has been around since the addition of backref.c. Due to the way we
calculate our slot numbers, after adding inline refs we're missing one keyed
ref unless it's located at the beginning of a new leaf.

Reported-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2012-05-22 13:43:25 +02:00
parent cd1b413c5c
commit dadcaf78b5
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/backref.c
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@ -413,7 +413,7 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
* enumerate all inline refs
*/
leaf = path->nodes[0];
slot = path->slots[0] - 1;
slot = path->slots[0];
item_size = btrfs_item_size_nr(leaf, slot);
BUG_ON(item_size < sizeof(*ei));
@ -661,8 +661,9 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct extent_buffer *leaf;
int slot;
path->slots[0]--;
leaf = path->nodes[0];
slot = path->slots[0] - 1;
slot = path->slots[0];
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid == bytenr &&
key.type == BTRFS_EXTENT_ITEM_KEY) {