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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-30 12:16:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-30 12:16:38 -0700
commit7f82f000ed030d1108b4de47d9e2d556092980c6 (patch)
tree13fde544ba1e30285e94b82cad3a9c14cfaf2d63 /drivers
parentd6c3112abe44d7f718bd5aec8ab9469fecff6041 (diff)
parent879129d208f725267366296b631aef31409cf304 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: dm snapshot: wait for chunks in destructor dm snapshot: fix register_snapshot deadlock dm raid1: fix do_failures
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-raid1.c3
-rw-r--r--drivers/md/dm-snap.c32
-rw-r--r--drivers/md/dm-snap.h2
3 files changed, 28 insertions, 9 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 92dcc06832a..9d7b53ed75b 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -656,9 +656,10 @@ static void do_failures(struct mirror_set *ms, struct bio_list *failures)
return;
if (!ms->log_failure) {
- while ((bio = bio_list_pop(failures)))
+ while ((bio = bio_list_pop(failures))) {
ms->in_sync = 0;
dm_rh_mark_nosync(ms->rh, bio, bio->bi_size, 0);
+ }
return;
}
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index b2d9d1ac28a..6c96db26b87 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -229,19 +229,21 @@ static void __insert_origin(struct origin *o)
*/
static int register_snapshot(struct dm_snapshot *snap)
{
- struct origin *o;
+ struct origin *o, *new_o;
struct block_device *bdev = snap->origin->bdev;
+ new_o = kmalloc(sizeof(*new_o), GFP_KERNEL);
+ if (!new_o)
+ return -ENOMEM;
+
down_write(&_origins_lock);
o = __lookup_origin(bdev);
- if (!o) {
+ if (o)
+ kfree(new_o);
+ else {
/* New origin */
- o = kmalloc(sizeof(*o), GFP_KERNEL);
- if (!o) {
- up_write(&_origins_lock);
- return -ENOMEM;
- }
+ o = new_o;
/* Initialise the struct */
INIT_LIST_HEAD(&o->snapshots);
@@ -368,6 +370,7 @@ static struct dm_snap_pending_exception *alloc_pending_exception(struct dm_snaps
struct dm_snap_pending_exception *pe = mempool_alloc(s->pending_pool,
GFP_NOIO);
+ atomic_inc(&s->pending_exceptions_count);
pe->snap = s;
return pe;
@@ -375,7 +378,11 @@ static struct dm_snap_pending_exception *alloc_pending_exception(struct dm_snaps
static void free_pending_exception(struct dm_snap_pending_exception *pe)
{
- mempool_free(pe, pe->snap->pending_pool);
+ struct dm_snapshot *s = pe->snap;
+
+ mempool_free(pe, s->pending_pool);
+ smp_mb__before_atomic_dec();
+ atomic_dec(&s->pending_exceptions_count);
}
static void insert_completed_exception(struct dm_snapshot *s,
@@ -600,6 +607,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
s->valid = 1;
s->active = 0;
+ atomic_set(&s->pending_exceptions_count, 0);
init_rwsem(&s->lock);
spin_lock_init(&s->pe_lock);
s->ti = ti;
@@ -726,6 +734,14 @@ static void snapshot_dtr(struct dm_target *ti)
/* After this returns there can be no new kcopyd jobs. */
unregister_snapshot(s);
+ while (atomic_read(&s->pending_exceptions_count))
+ yield();
+ /*
+ * Ensure instructions in mempool_destroy aren't reordered
+ * before atomic_read.
+ */
+ smp_mb();
+
#ifdef CONFIG_DM_DEBUG
for (i = 0; i < DM_TRACKED_CHUNK_HASH_SIZE; i++)
BUG_ON(!hlist_empty(&s->tracked_chunk_hash[i]));
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index f07315fe236..99c0106ede2 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -160,6 +160,8 @@ struct dm_snapshot {
mempool_t *pending_pool;
+ atomic_t pending_exceptions_count;
+
struct exception_table pending;
struct exception_table complete;