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-rw-r--r--fs/btrfs/delayed-ref.c10
-rw-r--r--fs/btrfs/delayed-ref.h1
2 files changed, 8 insertions, 3 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 759fa247ced..cbf7dc8ae3e 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,
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 57153fcc347..3bec2ff0b15 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -22,6 +22,7 @@
#define BTRFS_ADD_DELAYED_REF 1 /* add one backref to the tree */
#define BTRFS_DROP_DELAYED_REF 2 /* delete one backref from the tree */
#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
+#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */
struct btrfs_delayed_ref_node {
struct rb_node rb_node;