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raid1: Add a field array_frozen to indicate whether raid in freeze state. 

Because the following patch will rewrite the content between normal IO
and resync IO. So we used a parameter to indicate whether raid is in freeze
array.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
majianpeng 2013-11-14 15:16:18 +11:00 committed by NeilBrown
parent 82592c38a8
commit b364e3d048
2 changed files with 8 additions and 8 deletions
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15
drivers/md/raid1.c
View File

@ -829,6 +829,7 @@ static void raise_barrier(struct r1conf *conf)
/* Now wait for all pending IO to complete */
wait_event_lock_irq(conf->wait_barrier,
!conf->array_frozen &&
!conf->nr_pending && conf->barrier < RESYNC_DEPTH,
conf->resync_lock);
@ -860,10 +861,11 @@ static void wait_barrier(struct r1conf *conf)
* count down.
*/
wait_event_lock_irq(conf->wait_barrier,
!conf->barrier ||
!conf->array_frozen &&
(!conf->barrier ||
(conf->nr_pending &&
current->bio_list &&
!bio_list_empty(current->bio_list)),
!bio_list_empty(current->bio_list))),
conf->resync_lock);
conf->nr_waiting--;
}
@ -884,8 +886,7 @@ static void freeze_array(struct r1conf *conf, int extra)
{
/* stop syncio and normal IO and wait for everything to
* go quite.
* We increment barrier and nr_waiting, and then
* wait until nr_pending match nr_queued+extra
* We wait until nr_pending match nr_queued+extra
* This is called in the context of one normal IO request
* that has failed. Thus any sync request that might be pending
* will be blocked by nr_pending, and we need to wait for
@ -895,8 +896,7 @@ static void freeze_array(struct r1conf *conf, int extra)
* we continue.
*/
spin_lock_irq(&conf->resync_lock);
conf->barrier++;
conf->nr_waiting++;
conf->array_frozen = 1;
wait_event_lock_irq_cmd(conf->wait_barrier,
conf->nr_pending == conf->nr_queued+extra,
conf->resync_lock,
@ -907,8 +907,7 @@ static void unfreeze_array(struct r1conf *conf)
{
/* reverse the effect of the freeze */
spin_lock_irq(&conf->resync_lock);
conf->barrier--;
conf->nr_waiting--;
conf->array_frozen = 0;
wake_up(&conf->wait_barrier);
spin_unlock_irq(&conf->resync_lock);
}

1
drivers/md/raid1.h
View File

@ -65,6 +65,7 @@ struct r1conf {
int nr_waiting;
int nr_queued;
int barrier;
int array_frozen;
/* Set to 1 if a full sync is needed, (fresh device added).
* Cleared when a sync completes.