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authorChris Mason <chris.mason@oracle.com>2009-03-25 09:55:11 -0400
committerChris Mason <chris.mason@oracle.com>2009-03-25 09:55:11 -0400
commit1a81af4d1d9c60d4313309f937a1fc5567205a87 (patch)
tree535b65b3948d34f0948613afc6ebdfe693683f33 /fs/btrfs/delayed-ref.c
parentaf4176b49c5ee15a9c9b10720c92456b28e7aac7 (diff)
downloadlinux-1a81af4d1d9c60d4313309f937a1fc5567205a87.tar.bz2
Btrfs: make sure btrfs_update_delayed_ref doesn't increase ref_mod
btrfs_update_delayed_ref is optimized to add and remove different references in one pass through the delayed ref tree. It is a zero sum on the total number of refs on a given extent. But, the code was recording an extra ref in the head node. This never made it down to the disk but was used when deciding if it was safe to free the extent while dropping snapshots. The fix used here is to make sure the ref_mod count is unchanged on the head ref when btrfs_update_delayed_ref is called. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/delayed-ref.c')
-rw-r--r--fs/btrfs/delayed-ref.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 759fa247ced8..cbf7dc8ae3ec 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -450,8 +450,12 @@ static noinline int __btrfs_add_delayed_ref(struct btrfs_trans_handle *trans,
* the head node stores the sum of all the mods, so dropping a ref
* should drop the sum in the head node by one.
*/
- if (parent == (u64)-1 && action == BTRFS_DROP_DELAYED_REF)
- count_mod = -1;
+ if (parent == (u64)-1) {
+ if (action == BTRFS_DROP_DELAYED_REF)
+ count_mod = -1;
+ else if (action == BTRFS_UPDATE_DELAYED_HEAD)
+ count_mod = 0;
+ }
/*
* BTRFS_ADD_DELAYED_EXTENT means that we need to update
@@ -647,7 +651,7 @@ int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
*/
ret = __btrfs_add_delayed_ref(trans, &head_ref->node, bytenr, num_bytes,
(u64)-1, 0, 0, 0,
- BTRFS_ADD_DELAYED_REF, 0);
+ BTRFS_UPDATE_DELAYED_HEAD, 0);
BUG_ON(ret);
ret = __btrfs_add_delayed_ref(trans, &ref->node, bytenr, num_bytes,