raid5: avoid finding "discard" stripe

commit d47648fcf0611812286f68131b40251c6fa54f5e upstream.

SCSI discard will damage discard stripe bio setting, eg, some fields are
changed. If the stripe is reused very soon, we have wrong bios setting. We
remove discard stripe from hash list, so next time the strip will be fully
initialized.

Suitable for backport to 3.7+.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 279dd99bd4c8..4bed5454b8dc 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2812,6 +2812,14 @@ static void handle_stripe_clean_event(struct r5conf *conf,
                 }
                 /* now that discard is done we can proceed with any sync */
                 clear_bit(STRIPE_DISCARD, &sh->state);
+                /*
+                 * SCSI discard will change some bio fields and the stripe has
+                 * no updated data, so remove it from hash list and the stripe
+                 * will be reinitialized
+                 */
+                spin_lock_irq(&conf->device_lock);
+                remove_hash(sh);
+                spin_unlock_irq(&conf->device_lock);
                 if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state))
                         set_bit(STRIPE_HANDLE, &sh->state);