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Btrfs: skip locking when searching commit root

Message ID 1392261587-29035-1-git-send-email-wangsl.fnst@cn.fujitsu.com (mailing list archive)
State Accepted, archived
Headers show

Commit Message

Wang Shilong Feb. 13, 2014, 3:19 a.m. UTC 
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@cn.fujitsu.com>
---
 fs/btrfs/backref.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index a88da72..860f4f2 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -873,8 +873,10 @@  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.