From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Fri, 25 Oct 2013 11:12:02 +0000 (+0800)
Subject: Btrfs: remove scrub_super_lock holding in btrfs_sync_log()
X-Git-Tag: v3.13-rc1~85^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b011adfe14977fcda977234609d43ca52463a3d;p=pandora-kernel.git

Btrfs: remove scrub_super_lock holding in btrfs_sync_log()

Originally, we introduced scrub_super_lock to synchronize
tree log code with scrubbing super.

However we can replace scrub_super_lock with device_list_mutex,
because writing super will hold this mutex, this will reduce an extra
lock holding when writing supers in sync log code.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

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