linux-kernel - blk-mq: allow to defer ->queue

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Message-Id: <1415003008-16683-1-git-send-email-hch@lst.de>
Date:	Mon,  3 Nov 2014 09:23:26 +0100
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...com>
Cc:	Richard Weinberger <richard@....at>,
	Ming Lei <tom.leiming@...il.com>, ceph-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: blk-mq: allow to defer ->queue_rq invocations to workqueue

Drivers that need to do synchronous, blocking operations to do I/O generally
want to defer all I/O to a drіver-private workqueue.  Examples for that are
the loop driver, rbd, or ubi block driver, and probably lots more that haven't
been evaluated yet.

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