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| author | Shaohua Li <shli@kernel.org> | 2013-10-19 14:50:28 +0800 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2013-10-24 12:57:36 +1100 |
| commit | 37c61ff31e9b5e3fcf3cc6579f5c68f6ad40c4b1 (patch) | |
| tree | 531c906f33e284c2916213fb994b632b03ab885a /drivers/md | |
| parent | 905b0297a9533d7a6ee00a01a990456636877dd6 (diff) | |
| download | linux-37c61ff31e9b5e3fcf3cc6579f5c68f6ad40c4b1.tar.gz | |
raid5: set bio bi_vcnt 0 for discard request
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+ Cc: stable@vger.kernel.org (v3.7+) Reported-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 7ff4f252ca1a..302d7cd2076c 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -778,6 +778,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) 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); @@ -816,6 +822,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) 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), |