dm snapshot: use per device mempools
Change snapshot per-module mempool to per-device mempool.
Per-module mempools could cause a deadlock if multiple
snapshot devices are stacked above each other.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index 70dc961..292c156 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -161,6 +161,8 @@
/* The last percentage we notified */
int last_percent;
+ mempool_t *pending_pool;
+
struct exception_table pending;
struct exception_table complete;