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raid1: Replace raise_barrier/lower_barrier with freeze_array/unfreeze_array when reconfiguring the array. 

We used to use raise_barrier to suspend normal IO while we reconfigure
the array.  However raise_barrier will soon only suspend some normal
IO, not all.  So we need something else.
Change it to use freeze_array.
But freeze_array not only suspends normal io, it also suspends
resync io.
For the place where call raise_barrier for reconfigure, it isn't a
problem.

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 b364e3d048
commit 07169fd478
1 changed files with 6 additions and 5 deletions
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11
drivers/md/raid1.c
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@ -2870,8 +2870,8 @@ static int stop(struct mddev *mddev)
atomic_read(&bitmap->behind_writes) == 0);
}
raise_barrier(conf);
lower_barrier(conf);
freeze_array(conf, 0);
unfreeze_array(conf);
md_unregister_thread(&mddev->thread);
if (conf->r1bio_pool)
@ -3030,10 +3030,10 @@ static void raid1_quiesce(struct mddev *mddev, int state)
wake_up(&conf->wait_barrier);
break;
case 1:
raise_barrier(conf);
freeze_array(conf, 0);
break;
case 0:
lower_barrier(conf);
unfreeze_array(conf);
break;
}
}
@ -3050,7 +3050,8 @@ static void *raid1_takeover(struct mddev *mddev)
mddev->new_chunk_sectors = 0;
conf = setup_conf(mddev);
if (!IS_ERR(conf))
conf->barrier = 1;
/* Array must appear to be quiesced */
conf->array_frozen = 1;
return conf;
}
return ERR_PTR(-EINVAL);