linux-kernel - [PATCH 3.11 35/94] raid5: set bio bi

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Message-Id: <20131109065206.718908827@linuxfoundation.org>
Date:	Fri,  8 Nov 2013 22:51:41 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jes Sorensen <Jes.Sorensen@...hat.com>,
	Shaohua Li <shli@...ionio.com>, NeilBrown <neilb@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.11 35/94] raid5: set bio bi_vcnt 0 for discard request

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shaohua Li <shli@...nel.org>

commit 37c61ff31e9b5e3fcf3cc6579f5c68f6ad40c4b1 upstream.

SCSI layer will add new payload for discard request. If two bios are merged
to one, the second bio has bi_vcnt 1 which is set in raid5. This will confuse
SCSI and cause oops.

Suitable for backport to 3.7+

Reported-by: Jes Sorensen <Jes.Sorensen@...hat.com>
Signed-off-by: Shaohua Li <shli@...ionio.com>
Signed-off-by: NeilBrown <neilb@...e.de>
Acked-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/raid5.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -668,6 +668,12 @@ static void ops_run_io(struct stripe_hea
 			bi->bi_io_vec[0].bv_len = STRIPE_SIZE;
 			bi->bi_io_vec[0].bv_offset = 0;
 			bi->bi_size = STRIPE_SIZE;
+			/*
+			 * If this is discard request, set bi_vcnt 0. We don't
+			 * want to confuse SCSI because SCSI will replace payload
+			 */
+			if (rw & REQ_DISCARD)
+				bi->bi_vcnt = 0;
 			if (rrdev)
 				set_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags);
 
@@ -706,6 +712,12 @@ static void ops_run_io(struct stripe_hea
 			rbi->bi_io_vec[0].bv_len = STRIPE_SIZE;
 			rbi->bi_io_vec[0].bv_offset = 0;
 			rbi->bi_size = STRIPE_SIZE;
+			/*
+			 * If this is discard request, set bi_vcnt 0. We don't
+			 * want to confuse SCSI because SCSI will replace payload
+			 */
+			if (rw & REQ_DISCARD)
+				rbi->bi_vcnt = 0;
 			if (conf->mddev->gendisk)
 				trace_block_bio_remap(bdev_get_queue(rbi->bi_bdev),
 						      rbi, disk_devt(conf->mddev->gendisk),


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