linux-kernel - Re: [PATCH 0/4] minor blk-mq updates

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Date:	Fri, 07 Feb 2014 11:36:45 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH 0/4] minor blk-mq updates

On Fri, 2014-02-07 at 10:22 -0800, Christoph Hellwig wrote:
> Hi Jens,
> 
> these small blk-mq core updates fell out of the scsi multiqueue work.

That reminds me, the following blk-mq patch was required to get DIF
working with scsi-mq.

Jens, care to pick this up as well..?

--nab

>From 1428a390cc16025f93905852777d4afd8aeba05d Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@...ux-iscsi.org>
Date: Sun, 22 Dec 2013 11:58:49 +0000
Subject: blk-mq: Add bio_integrity setup to blk_mq_make_request

This patch adds the missing bio_integrity_enabled() +
bio_integrity_prep() setup into blk_mq_make_request()
in order to use DIF protection with scsi-mq.

Cc: Jens Axboe <axboe@...nel.dk>
Cc: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
---
diff --git a/block/blk-mq.c b/block/blk-mq.c
index c79126e..a520c39 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -916,6 +916,11 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
 
 	blk_queue_bounce(q, &bio);
 
+	if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
+		bio_endio(bio, -EIO);
+		return;
+	}
+
 	if (use_plug && blk_attempt_plug_merge(q, bio, &request_count))
 		return;
 

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