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raid5: update analysis state for failed stripe 

handle_failed_stripe() makes the stripe fail, eg, all IO will return
with a failure, but it doesn't update stripe_head_state. Later
handle_stripe() has special handling for raid6 for handle_stripe_fill().
That check before handle_stripe_fill() doesn't skip the failed stripe
and we get a kernel crash in need_this_block.  This patch clear the
analysis state to make sure no functions wrongly called after
handle_failed_stripe()

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li 2015-09-18 10:20:13 -07:00 committed by NeilBrown
parent 88724bfa68
commit ebda780bce
1 changed files with 4 additions and 0 deletions
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4
drivers/md/raid5.c
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@ -3150,6 +3150,8 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
spin_unlock_irq(&sh->stripe_lock);
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
wake_up(&conf->wait_for_overlap);
if (bi)
s->to_read--;
while (bi && bi->bi_iter.bi_sector <
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi =
@ -3169,6 +3171,8 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
*/
clear_bit(R5_LOCKED, &sh->dev[i].flags);
}
s->to_write = 0;
s->written = 0;
if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))
if (atomic_dec_and_test(&conf->pending_full_writes))