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[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>
This commit is contained in:
Jonathan E Brassow 2006-11-08 17:44:44 -08:00 committed by Linus Torvalds
parent 5d55fdf949
commit 33184048dc
1 changed files with 21 additions and 1 deletions
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22
drivers/md/dm-raid1.c
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@ -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");