From: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit e84752d434b5cca0869e906e7b94d0531b25c6d3 upstream.
We won't change commit root, skip locking dance with commit root
when walking backrefs, this can speed up btrfs send operations.
Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/btrfs/backref.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 5859a05f3a76..b7f40f2630f4 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -842,8 +842,10 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
- if (!trans)
+ if (!trans) {
path->search_commit_root = 1;
+ path->skip_locking = 1;
+ }
/*
* grab both a lock on the path and a lock on the delayed ref head.
--
2.7.4
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