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raid5: avoid finding "discard" stripe 

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+.

Cc: <stable@vger.kernel.org> (3.7+)
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Shaohua Li 2013-10-19 14:51:42 +08:00 committed by NeilBrown
parent 37c61ff31e
commit d47648fcf0
1 changed files with 8 additions and 0 deletions
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8
drivers/md/raid5.c
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@ -2922,6 +2922,14 @@ 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);