From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Fri, 28 Feb 2014 02:46:04 +0000 (+0800)
Subject: btrfs: Add high priority workqueue support for btrfs_workqueue_struct
X-Git-Tag: v3.15-rc1~96^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ca08976ae94f3594dd7303584581cf8099ce47e;p=pandora-kernel.git

btrfs: Add high priority workqueue support for btrfs_workqueue_struct

Add high priority function to btrfs_workqueue.

This is implemented by embedding a btrfs_workqueue into a
btrfs_workqueue and use some helper functions to differ the normal
priority wq and high priority wq.
So the high priority wq is completely independent from the normal
workqueue.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Tested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
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