From: Tejun Heo <tj@kernel.org>
Date: Mon, 5 Mar 2012 21:14:59 +0000 (-0800)
Subject: block: extend queue bypassing to cover blkcg policies
X-Git-Tag: v3.5-rc1~42^2~87
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ecf23afab13c39d3bb0e2d826d0984b0dd53733;p=pandora-kernel.git

block: extend queue bypassing to cover blkcg policies

Extend queue bypassing such that dying queue is always bypassing and
blk-throttle is drained on bypass.  With blkcg policies updated to
test blk_queue_bypass() instead of blk_queue_dead(), this ensures that
no bio or request is held by or going through blkcg policies on a
bypassing queue.

This will be used to implement blkg cleanup on elevator switches and
policy changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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