tree ea4e8e21df1b639603693e6f5fdfc5a620cd8737
parent b2fab5acd28ead6f0dd6c3996ba23f0ef1772f15
author Tejun Heo <tj@kernel.org> 1330982098 -0800
committer Jens Axboe <axboe@kernel.dk> 1331065641 +0100

block: implement blk_queue_bypass_start/end()

Rename and extend elv_queisce_start/end() to
blk_queue_bypass_start/end() which are exported and supports nesting
via @q->bypass_depth.  Also add blk_queue_bypass() to test bypass
state.

This will be further extended and used for blkio_group management.

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