diff options
| -rw-r--r-- | drivers/md/dm-snap.c | 35 | ||||
| -rw-r--r-- | drivers/md/dm.c | 13 | ||||
| -rw-r--r-- | include/linux/device-mapper.h | 1 |
3 files changed, 43 insertions, 6 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index c2bf822..f83a0f3 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1888,20 +1888,39 @@ static int snapshot_preresume(struct dm_target *ti) static void snapshot_resume(struct dm_target *ti) { struct dm_snapshot *s = ti->private; - struct dm_snapshot *snap_src = NULL, *snap_dest = NULL; + struct dm_snapshot *snap_src = NULL, *snap_dest = NULL, *snap_merging = NULL; struct dm_origin *o; struct mapped_device *origin_md = NULL; + bool must_restart_merging = false; down_read(&_origins_lock); o = __lookup_dm_origin(s->origin->bdev); if (o) origin_md = dm_table_get_md(o->ti->table); + if (!origin_md) { + (void) __find_snapshots_sharing_cow(s, NULL, NULL, &snap_merging); + if (snap_merging) + origin_md = dm_table_get_md(snap_merging->ti->table); + } if (origin_md == dm_table_get_md(ti->table)) origin_md = NULL; + if (origin_md) { + if (dm_hold(origin_md)) + origin_md = NULL; + } - if (origin_md) + up_read(&_origins_lock); + + if (origin_md) { dm_internal_suspend_fast(origin_md); + if (snap_merging && test_bit(RUNNING_MERGE, &snap_merging->state_bits)) { + must_restart_merging = true; + stop_merge(snap_merging); + } + } + + down_read(&_origins_lock); (void) __find_snapshots_sharing_cow(s, &snap_src, &snap_dest, NULL); if (snap_src && snap_dest) { @@ -1912,11 +1931,15 @@ static void snapshot_resume(struct dm_target *ti) up_write(&snap_src->lock); } - if (origin_md) - dm_internal_resume_fast(origin_md); - up_read(&_origins_lock); + if (origin_md) { + if (must_restart_merging) + start_merge(snap_merging); + dm_internal_resume_fast(origin_md); + dm_put(origin_md); + } + /* Now we have correct chunk size, reregister */ reregister_snapshot(s); @@ -2360,7 +2383,7 @@ static struct target_type snapshot_target = { static struct target_type merge_target = { .name = dm_snapshot_merge_target_name, - .version = {1, 2, 0}, + .version = {1, 3, 0}, .module = THIS_MODULE, .ctr = snapshot_ctr, .dtr = snapshot_dtr, diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 6e2b2e9..9b641b3 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2616,6 +2616,19 @@ void dm_get(struct mapped_device *md) BUG_ON(test_bit(DMF_FREEING, &md->flags)); } +int dm_hold(struct mapped_device *md) +{ + spin_lock(&_minor_lock); + if (test_bit(DMF_FREEING, &md->flags)) { + spin_unlock(&_minor_lock); + return -EBUSY; + } + dm_get(md); + spin_unlock(&_minor_lock); + return 0; +} +EXPORT_SYMBOL_GPL(dm_hold); + const char *dm_device_name(struct mapped_device *md) { return md->name; diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 2646aed..fd23978 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -375,6 +375,7 @@ int dm_create(int minor, struct mapped_device **md); */ struct mapped_device *dm_get_md(dev_t dev); void dm_get(struct mapped_device *md); +int dm_hold(struct mapped_device *md); void dm_put(struct mapped_device *md); /* |