Commit e84752d4 authored Feb 13, 2014 by Wang Shilong Committed by Josef Bacik Mar 10, 2014

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>

parent 32a44789

fs/btrfs/backref.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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.