dm snapshot: avoid storing private suspended state

Use dm_suspended() rather than having each snapshot target maintain a
private 'suspended' flag in struct dm_snapshot.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 0f47698..fdde53c 100644 (file)
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -79,9 +79,6 @@ 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;
-
        atomic_t pending_exceptions_count;
 
        mempool_t *pending_pool;
@@ -1102,7 +1099,6 @@ 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);
        INIT_LIST_HEAD(&s->list);
@@ -1733,15 +1729,6 @@ static void snapshot_merge_presuspend(struct dm_target *ti)
        stop_merge(s);
 }
 
-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 int snapshot_preresume(struct dm_target *ti)
 {
        int r = 0;
@@ -1756,7 +1743,7 @@ static int snapshot_preresume(struct dm_target *ti)
                        DMERR("Unable to resume snapshot source until "
                              "handover completes.");
                        r = -EINVAL;
-               } else if (!snap_src->suspended) {
+               } else if (!dm_suspended(snap_src->ti)) {
                        DMERR("Unable to perform snapshot handover until "
                              "source is suspended.");
                        r = -EINVAL;
@@ -1789,7 +1776,6 @@ static void snapshot_resume(struct dm_target *ti)
 
        down_write(&s->lock);
        s->active = 1;
-       s->suspended = 0;
        up_write(&s->lock);
 }
 
@@ -2167,7 +2153,7 @@ static int origin_iterate_devices(struct dm_target *ti,
 
 static struct target_type origin_target = {
        .name    = "snapshot-origin",
-       .version = {1, 7, 0},
+       .version = {1, 7, 1},
        .module  = THIS_MODULE,
        .ctr     = origin_ctr,
        .dtr     = origin_dtr,
@@ -2180,13 +2166,12 @@ static struct target_type origin_target = {
 
 static struct target_type snapshot_target = {
        .name    = "snapshot",
-       .version = {1, 9, 0},
+       .version = {1, 10, 0},
        .module  = THIS_MODULE,
        .ctr     = snapshot_ctr,
        .dtr     = snapshot_dtr,
        .map     = snapshot_map,
        .end_io  = snapshot_end_io,
-       .postsuspend = snapshot_postsuspend,
        .preresume  = snapshot_preresume,
        .resume  = snapshot_resume,
        .status  = snapshot_status,
@@ -2195,14 +2180,13 @@ static struct target_type snapshot_target = {
 
 static struct target_type merge_target = {
        .name    = dm_snapshot_merge_target_name,
-       .version = {1, 0, 0},
+       .version = {1, 1, 0},
        .module  = THIS_MODULE,
        .ctr     = snapshot_ctr,
        .dtr     = snapshot_dtr,
        .map     = snapshot_merge_map,
        .end_io  = snapshot_end_io,
        .presuspend = snapshot_merge_presuspend,
-       .postsuspend = snapshot_postsuspend,
        .preresume  = snapshot_preresume,
        .resume  = snapshot_merge_resume,
        .status  = snapshot_status,