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| author | Mike Snitzer <snitzer@redhat.com> | 2009-12-10 23:52:12 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-10 23:52:12 +0000 |
| commit | c26655ca3ca7550740a63820ee981e5c7c797523 (patch) | |
| tree | 1ac39d32d93a6fd5dbcfb5fa95304aecb6cb5efe /drivers/md/dm-snap.c | |
| parent | fc56f6fbcca3672c63c93c65f45105faacfc13cb (diff) | |
| download | kernel-common-c26655ca3ca7550740a63820ee981e5c7c797523.tar.gz kernel-common-c26655ca3ca7550740a63820ee981e5c7c797523.tar.bz2 kernel-common-c26655ca3ca7550740a63820ee981e5c7c797523.zip | |
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>
Diffstat (limited to 'drivers/md/dm-snap.c')
| -rw-r--r-- | drivers/md/dm-snap.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index dc500a6f6232..fd04caa90340 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -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, |