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authorMike Snitzer <snitzer@redhat.com>2011-01-13 22:59:59 +0300
committerAlasdair G Kergon <agk@redhat.com>2011-01-13 22:59:59 +0300
commitb83b2f295aec418c7501c05df4dfd168a79d165a (patch)
tree55249c09281930055439c449f55f156784d0bb68 /drivers
parent239c8dd533e74de4a7f3c85c4f9f430eb08867c1 (diff)
downloadlinux-b83b2f295aec418c7501c05df4dfd168a79d165a.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-snap.c24
1 files changed, 4 insertions, 20 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 0f47698beafa..fdde53cd12b7 100644
--- 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,