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authorWang Shilong <wangsl.fnst@cn.fujitsu.com>2014-02-13 11:19:47 +0800
committerJosef Bacik <jbacik@fb.com>2014-03-10 15:16:55 -0400
commite84752d434b5cca0869e906e7b94d0531b25c6d3 (patch)
treeead4db0b6f80fef7abfde5396dbd1f7967cc2b9a /fs/btrfs/backref.c
parent32a447896c7b4c5cf5502a3ca7f5ef57d498fb03 (diff)
downloadlinux-e84752d434b5cca0869e906e7b94d0531b25c6d3.tar.bz2
Btrfs: skip locking when searching commit root
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> Signed-off-by: Josef Bacik <jbacik@fb.com>
Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index a88da721dfc5..860f4f22b9b0 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.