dm: optimize dm_mq_queue_rq()

[linux-block.git] / drivers / md / dm-table.c

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index a49e62b8611f2ed11bde45153b158d766534531f..89180fdbd28c1f35c542e7803d3091e839817185 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -920,6 +920,16 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
        return t->immutable_target_type;
 }
 
+struct dm_target *dm_table_get_immutable_target(struct dm_table *t)
+{
+       /* Immutable target is implicitly a singleton */
+       if (t->num_targets > 1 ||
+           !dm_target_is_immutable(t->targets[0].type))
+               return NULL;
+
+       return t->targets;
+}
+
 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
 {
        struct dm_target *uninitialized_var(ti);