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| author | Wang Shilong <wangsl.fnst@cn.fujitsu.com> | 2014-02-13 11:19:47 +0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-04-11 16:43:49 +0200 |
| commit | a8a83b61ee4585fdae046a98fc1bd20cdb122fc7 (patch) | |
| tree | 0fdc725a4a2a8e37ba598cc1f6ff46e1912d0f49 | |
| parent | 5f3284939089d34d1a7685ad83aeca797c3896ae (diff) | |
| download | lwn-a8a83b61ee4585fdae046a98fc1bd20cdb122fc7.tar.gz lwn-a8a83b61ee4585fdae046a98fc1bd20cdb122fc7.zip | |
Btrfs: skip locking when searching commit root
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@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | fs/btrfs/backref.c | 4 |
1 files changed, 3 insertions, 1 deletions
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. |