From 07169fd478ed2fbb3c894d524be9400658f16747 Mon Sep 17 00:00:00 2001 From: majianpeng Date: Thu, 14 Nov 2013 15:16:18 +1100 Subject: [PATCH] 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 Signed-off-by: NeilBrown --- drivers/md/raid1.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 729db21..ba5efb0 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -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); -- 2.7.4