linux-kernel - [PATCH 0/2] use q->prep_rq_fn for flush requests instead of q->prepare_flush

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Message-Id: <1278056005-25438-1-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Fri,  2 Jul 2010 16:33:23 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	James.Bottomley@...e.de, axboe@...nel.dk
Cc:	hch@....de, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, fujita.tomonori@....ntt.co.jp
Subject: [PATCH 0/2] use q->prep_rq_fn for flush requests instead of q->prepare_flush_fn()

scsi-ml builds flush requests via q->prepare_flush_fn(), however,
builds discard requests via q->prep_rq_fn.

Using two different mechnisms for the similar requests (building
commands in SCSI ULD) doesn't make sense.

Handing both via q->prep_rq_fn makes the code simpler.

We could kill q->prepare_flush_fn(). Except for ide, all the users
just mark flush requests. They can use REQ_FLUSH flag instead. Ide can
do like SCSI.

==
 block/blk-barrier.c |   12 ++++--------
 drivers/scsi/sd.c   |   26 ++++++++++++++++----------
 include/linux/bio.h |    2 ++
 3 files changed, 22 insertions(+), 18 deletions(-)
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