linux-kernel - next round of blk-mq updates

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Date:	Wed, 16 Apr 2014 09:44:51 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: next round of blk-mq updates

Hi Jens,

these are the final blk-mq changes for a fully working SCSI midlayer
using blk-mq.

Summary of the changes:

 - a new split I/O completion handler that allow the driver to free
   ressources when it knows a request will be fully completed, but
   before it has been freed
 - support for bidirectional requests, which is very trivial when
   used with the above split I/O completion handler.
 - support to requeue a request that already entered the driver,
   which is needed by the SCSI midlayer to support partial completions
   as well as various error conditions.
 - a couple of new ways to poke a queue:
	- an equivalent to blk_delay_queue to wake a stopped
	  queue after a delay
	- a new function to kick a queue that might be stopped or not
	- a parameter to blk_mq_start_stopped_hw_queues so that it can
	  be called from (soft)irq context

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