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dm snapshot: track suspended state in target 

Keep track of whether or not the device is suspended within the snapshot
target module, the same as we do in dm-raid1.

We will use this later to enforce the correct sequence of ioctls to
transfer the in-core exceptions from a snapshot target instance in
one table to a replacement one capable of merging them back
into the origin.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2009-12-10 23:52:12 +00:00 committed by Alasdair G Kergon
parent fc56f6fbcc
commit c26655ca3c
1 changed files with 16 additions and 1 deletions
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17
drivers/md/dm-snap.c
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@ -72,6 +72,9 @@ struct dm_snapshot {
/* Origin writes don't trigger exceptions until this is set */
int active;
/* Whether or not owning mapped_device is suspended */
int suspended;
mempool_t *pending_pool;
atomic_t pending_exceptions_count;
@ -656,6 +659,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
s->ti = ti;
s->valid = 1;
s->active = 0;
s->suspended = 0;
atomic_set(&s->pending_exceptions_count, 0);
init_rwsem(&s->lock);
spin_lock_init(&s->pe_lock);
@ -1175,12 +1179,22 @@ static int snapshot_end_io(struct dm_target *ti, struct bio *bio,
return 0;
}
static void snapshot_postsuspend(struct dm_target *ti)
{
struct dm_snapshot *s = ti->private;
down_write(&s->lock);
s->suspended = 1;
up_write(&s->lock);
}
static void snapshot_resume(struct dm_target *ti)
{
struct dm_snapshot *s = ti->private;
down_write(&s->lock);
s->active = 1;
s->suspended = 0;
up_write(&s->lock);
}
@ -1489,12 +1503,13 @@ static struct target_type origin_target = {
static struct target_type snapshot_target = {
.name = "snapshot",
.version = {1, 8, 0},
.version = {1, 9, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,
.map = snapshot_map,
.end_io = snapshot_end_io,
.postsuspend = snapshot_postsuspend,
.resume = snapshot_resume,
.status = snapshot_status,
.iterate_devices = snapshot_iterate_devices,