linux-kernel - request->ioprio

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Date:	Wed, 06 Aug 2008 18:32:38 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: request->ioprio

(CCing LKML)

Hi Jens, Rusty,

Trying to implement i/o tracking all the way up to the page cache (so
that cfq and the future cgroup-based I/O controllers can schedule
buffered I/O properly) I noticed that struct request's ioprio is
initialized but never used for I/O scheduling purposes. Indeed there
seems to be one single user of this member: virtio_blk. Virtio uses
struct request's ioprio in the request() function of the virtio block
driver, which just copies the ioprio value to the output header of
virtblk_req.

Is this the intended use of struct request's ioprio? Is it OK for device
drivers to use it? If the answer two the previous to questions is no I
would like to send some clean-up patches.

- Fernando

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