diff options
Diffstat (limited to 'fs/btrfs/delayed-ref.c')
| -rw-r--r-- | fs/btrfs/delayed-ref.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index 874565a1f634..3e7eeaf86408 100644 --- a/fs/btrfs/delayed-ref.c +++ b/fs/btrfs/delayed-ref.c @@ -511,6 +511,24 @@ int btrfs_add_delayed_ref(struct btrfs_trans_handle *trans, } /* + * this does a simple search for the head node for a given extent. + * It must be called with the delayed ref spinlock held, and it returns + * the head node if any where found, or NULL if not. + */ +struct btrfs_delayed_ref_head * +btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr) +{ + struct btrfs_delayed_ref_node *ref; + struct btrfs_delayed_ref_root *delayed_refs; + + delayed_refs = &trans->transaction->delayed_refs; + ref = tree_search(&delayed_refs->root, bytenr, (u64)-1); + if (ref) + return btrfs_delayed_node_to_head(ref); + return NULL; +} + +/* * add a delayed ref to the tree. This does all of the accounting required * to make sure the delayed ref is eventually processed before this * transaction commits. |