This is a note to let you know that I've just added the patch titled
raid5: set bio bi_vcnt 0 for discard request
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
raid5-set-bio-bi_vcnt-0-for-discard-request.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 37c61ff31e9b5e3fcf3cc6579f5c68f6ad40c4b1 Mon Sep 17 00:00:00 2001
From: Shaohua Li <shli@xxxxxxxxxx>
Date: Sat, 19 Oct 2013 14:50:28 +0800
Subject: raid5: set bio bi_vcnt 0 for discard request
From: Shaohua Li <shli@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Acked-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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),
Patches currently in stable-queue which might be from shli@xxxxxxxxxx are
queue-3.11/raid5-set-bio-bi_vcnt-0-for-discard-request.patch
queue-3.11/raid5-avoid-finding-discard-stripe.patch
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