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authorJonathan E Brassow <jbrassow@redhat.com>2006-11-08 17:44:44 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-11-08 18:29:23 -0800
commit33184048dc4f9d5550d3b6a88c8e0ff92033eb6e (patch)
treee48a69f43b6efd99c6bd82ee768e5bff2358dbcd /drivers/md/dm-raid1.c
parent5d55fdf94998db1df9ee7f1def8806bfd0e5ff73 (diff)
[PATCH] dm: raid1: fix waiting for io on suspend
All device-mapper targets must complete outstanding I/O before suspending. The mirror target generates I/O in its recovery phase and fails to wait for it. It needs to be tracked so we can ensure that it has completed before we suspend. [akpm@osdl.org: cleanup] Signed-off-by: Jonathan E Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: <dm-devel@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/dm-raid1.c')
-rw-r--r--drivers/md/dm-raid1.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 659224cb7c53..48a653b3f518 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -24,6 +24,7 @@
static struct workqueue_struct *_kmirrord_wq;
static struct work_struct _kmirrord_work;
+static DECLARE_WAIT_QUEUE_HEAD(_kmirrord_recovery_stopped);
static inline void wake(void)
{
@@ -83,6 +84,7 @@ struct region_hash {
struct list_head *buckets;
spinlock_t region_lock;
+ atomic_t recovery_in_flight;
struct semaphore recovery_count;
struct list_head clean_regions;
struct list_head quiesced_regions;
@@ -191,6 +193,7 @@ static int rh_init(struct region_hash *rh, struct mirror_set *ms,
spin_lock_init(&rh->region_lock);
sema_init(&rh->recovery_count, 0);
+ atomic_set(&rh->recovery_in_flight, 0);
INIT_LIST_HEAD(&rh->clean_regions);
INIT_LIST_HEAD(&rh->quiesced_regions);
INIT_LIST_HEAD(&rh->recovered_regions);
@@ -382,6 +385,8 @@ static void rh_update_states(struct region_hash *rh)
rh->log->type->clear_region(rh->log, reg->key);
rh->log->type->complete_resync_work(rh->log, reg->key, 1);
dispatch_bios(rh->ms, &reg->delayed_bios);
+ if (atomic_dec_and_test(&rh->recovery_in_flight))
+ wake_up_all(&_kmirrord_recovery_stopped);
up(&rh->recovery_count);
mempool_free(reg, rh->region_pool);
}
@@ -502,11 +507,21 @@ static int __rh_recovery_prepare(struct region_hash *rh)
static void rh_recovery_prepare(struct region_hash *rh)
{
- while (!down_trylock(&rh->recovery_count))
+ /* Extra reference to avoid race with rh_stop_recovery */
+ atomic_inc(&rh->recovery_in_flight);
+
+ while (!down_trylock(&rh->recovery_count)) {
+ atomic_inc(&rh->recovery_in_flight);
if (__rh_recovery_prepare(rh) <= 0) {
+ atomic_dec(&rh->recovery_in_flight);
up(&rh->recovery_count);
break;
}
+ }
+
+ /* Drop the extra reference */
+ if (atomic_dec_and_test(&rh->recovery_in_flight))
+ wake_up_all(&_kmirrord_recovery_stopped);
}
/*
@@ -1177,6 +1192,11 @@ static void mirror_postsuspend(struct dm_target *ti)
struct dirty_log *log = ms->rh.log;
rh_stop_recovery(&ms->rh);
+
+ /* Wait for all I/O we generated to complete */
+ wait_event(_kmirrord_recovery_stopped,
+ !atomic_read(&ms->rh.recovery_in_flight));
+
if (log->type->suspend && log->type->suspend(log))
/* FIXME: need better error handling */
DMWARN("log suspend failed");