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-rw-r--r--block/elevator.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 52ada14cfe45..ff45d8388f48 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -336,6 +336,9 @@ enum elv_merge elv_merge(struct request_queue *q, struct request **req,
__rq = elv_rqhash_find(q, bio->bi_iter.bi_sector);
if (__rq && elv_bio_merge_ok(__rq, bio)) {
*req = __rq;
+
+ if (blk_discard_mergable(__rq))
+ return ELEVATOR_DISCARD_MERGE;
return ELEVATOR_BACK_MERGE;
}
@@ -630,6 +633,9 @@ static inline bool elv_support_iosched(struct request_queue *q)
*/
static struct elevator_type *elevator_get_default(struct request_queue *q)
{
+ if (q->tag_set && q->tag_set->flags & BLK_MQ_F_NO_SCHED_BY_DEFAULT)
+ return NULL;
+
if (q->nr_hw_queues != 1 &&
!blk_mq_is_sbitmap_shared(q->tag_set->flags))
return NULL;
@@ -702,7 +708,6 @@ void elevator_init_mq(struct request_queue *q)
elevator_put(e);
}
}
-EXPORT_SYMBOL_GPL(elevator_init_mq); /* only for dm-rq */
/*
* switch to new_e io scheduler. be careful not to introduce deadlocks -