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md: fix up raid1/raid10 unplugging.

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We just need to make sure that an unplug event wakes up the md
thread, which is exactly what mddev_check_plugged does.

Also remove some plug-related code that is no longer needed.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2011-04-18 18:25:43 +10:00
parent 7c13edc875
commit c3b328ac84
2 changed files with 20 additions and 28 deletions
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24
drivers/md/raid10.c
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@@ -634,12 +634,6 @@ static void flush_pending_writes(conf_t *conf)
spin_unlock_irq(&conf->device_lock);
}
static void md_kick_device(mddev_t *mddev)
{
blk_flush_plug(current);
md_wakeup_thread(mddev->thread);
}
/* Barriers....
* Sometimes we need to suspend IO while we do something else,
* either some resync/recovery, or reconfigure the array.
@@ -669,15 +663,15 @@ static void raise_barrier(conf_t *conf, int force)
/* Wait until no block IO is waiting (unless 'force') */
wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
conf->resync_lock, md_kick_device(conf->mddev));
conf->resync_lock, );
/* block any new IO from starting */
conf->barrier++;
/* No wait for all pending IO to complete */
/* Now wait for all pending IO to complete */
wait_event_lock_irq(conf->wait_barrier,
!conf->nr_pending && conf->barrier < RESYNC_DEPTH,
conf->resync_lock, md_kick_device(conf->mddev));
conf->resync_lock, );
spin_unlock_irq(&conf->resync_lock);
}
@@ -698,7 +692,7 @@ static void wait_barrier(conf_t *conf)
conf->nr_waiting++;
wait_event_lock_irq(conf->wait_barrier, !conf->barrier,
conf->resync_lock,
md_kick_device(conf->mddev));
);
conf->nr_waiting--;
}
conf->nr_pending++;
@@ -734,8 +728,8 @@ static void freeze_array(conf_t *conf)
wait_event_lock_irq(conf->wait_barrier,
conf->nr_pending == conf->nr_queued+1,
conf->resync_lock,
({ flush_pending_writes(conf);
md_kick_device(conf->mddev); }));
flush_pending_writes(conf));
spin_unlock_irq(&conf->resync_lock);
}
@@ -762,6 +756,7 @@ static int make_request(mddev_t *mddev, struct bio * bio)
const unsigned long do_fua = (bio->bi_rw & REQ_FUA);
unsigned long flags;
mdk_rdev_t *blocked_rdev;
int plugged;
if (unlikely(bio->bi_rw & REQ_FLUSH)) {
md_flush_request(mddev, bio);
@@ -870,6 +865,8 @@ static int make_request(mddev_t *mddev, struct bio * bio)
* inc refcount on their rdev. Record them by setting
* bios[x] to bio
*/
plugged = mddev_check_plugged(mddev);
raid10_find_phys(conf, r10_bio);
retry_write:
blocked_rdev = NULL;
@@ -946,9 +943,8 @@ static int make_request(mddev_t *mddev, struct bio * bio)
/* In case raid10d snuck in to freeze_array */
wake_up(&conf->wait_barrier);
if (do_sync || !mddev->bitmap)
if (do_sync || !mddev->bitmap || !plugged)
md_wakeup_thread(mddev->thread);
return 0;
}