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dm thin: suspend/resume active thin devices when reloading thin-pool 

Before this change it was expected that userspace would first suspend
all active thin devices, reload/resize the thin-pool target, then resume
all active thin devices.  Now the thin-pool suspend/resume will trigger
the suspend/resume of all active thins via appropriate calls to
dm_internal_suspend and dm_internal_resume.

Store the mapped_device for each thin device in struct thin_c to make
these calls possible.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer 2014-10-28 20:58:45 -04:00
parent ffcc393641
commit 583024d248
1 changed files with 38 additions and 2 deletions
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40
drivers/md/dm-thin.c
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@ -292,6 +292,8 @@ struct thin_c {
struct pool *pool;
struct dm_thin_device *td;
struct mapped_device *thin_md;
bool requeue_mode:1;
spinlock_t lock;
struct list_head deferred_cells;
@ -3113,19 +3115,48 @@ static int pool_preresume(struct dm_target *ti)
return 0;
}
static void pool_suspend_active_thins(struct pool *pool)
{
struct thin_c *tc;
/* Suspend all active thin devices */
tc = get_first_thin(pool);
while (tc) {
dm_internal_suspend_noflush(tc->thin_md);
tc = get_next_thin(pool, tc);
}
}
static void pool_resume_active_thins(struct pool *pool)
{
struct thin_c *tc;
/* Resume all active thin devices */
tc = get_first_thin(pool);
while (tc) {
dm_internal_resume(tc->thin_md);
tc = get_next_thin(pool, tc);
}
}
static void pool_resume(struct dm_target *ti)
{
struct pool_c *pt = ti->private;
struct pool *pool = pt->pool;
unsigned long flags;
/*
* Must requeue active_thins' bios and then resume
* active_thins _before_ clearing 'suspend' flag.
*/
requeue_bios(pool);
pool_resume_active_thins(pool);
spin_lock_irqsave(&pool->lock, flags);
pool->low_water_triggered = false;
pool->suspended = false;
spin_unlock_irqrestore(&pool->lock, flags);
requeue_bios(pool);
do_waker(&pool->waker.work);
}
@ -3138,6 +3169,8 @@ static void pool_presuspend(struct dm_target *ti)
spin_lock_irqsave(&pool->lock, flags);
pool->suspended = true;
spin_unlock_irqrestore(&pool->lock, flags);
pool_suspend_active_thins(pool);
}
static void pool_presuspend_undo(struct dm_target *ti)
@ -3146,6 +3179,8 @@ static void pool_presuspend_undo(struct dm_target *ti)
struct pool *pool = pt->pool;
unsigned long flags;
pool_resume_active_thins(pool);
spin_lock_irqsave(&pool->lock, flags);
pool->suspended = false;
spin_unlock_irqrestore(&pool->lock, flags);
@ -3703,6 +3738,7 @@ static int thin_ctr(struct dm_target *ti, unsigned argc, char **argv)
r = -ENOMEM;
goto out_unlock;
}
tc->thin_md = dm_table_get_md(ti->table);
spin_lock_init(&tc->lock);
INIT_LIST_HEAD(&tc->deferred_cells);
bio_list_init(&tc->deferred_bio_list);