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-rw-r--r--block/blk-core.c4
-rw-r--r--block/blk-mq.c2
-rw-r--r--include/linux/blk-mq.h1
3 files changed, 6 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 0f7093dfc010..17eed16a6e04 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1263,6 +1263,8 @@ static struct request *__get_request(struct request_list *rl, unsigned int op,
blk_rq_set_rl(rq, rl);
rq->cmd_flags = op;
rq->rq_flags = rq_flags;
+ if (flags & BLK_MQ_REQ_PREEMPT)
+ rq->rq_flags |= RQF_PREEMPT;
/* init elvpriv */
if (rq_flags & RQF_ELVPRIV) {
@@ -1444,7 +1446,7 @@ struct request *blk_get_request_flags(struct request_queue *q, unsigned int op,
struct request *req;
WARN_ON_ONCE(op & REQ_NOWAIT);
- WARN_ON_ONCE(flags & ~BLK_MQ_REQ_NOWAIT);
+ WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PREEMPT));
if (q->mq_ops) {
req = blk_mq_alloc_request(q, op, flags);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7173d4bd64af..e21876778cec 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -291,6 +291,8 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
rq->q = data->q;
rq->mq_ctx = data->ctx;
rq->cmd_flags = op;
+ if (data->flags & BLK_MQ_REQ_PREEMPT)
+ rq->rq_flags |= RQF_PREEMPT;
if (blk_queue_io_stat(data->q))
rq->rq_flags |= RQF_IO_STAT;
/* do not touch atomic flags, it needs atomic ops against the timer */
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 4ae987c2352c..82b56609736a 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -212,6 +212,7 @@ enum {
BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
+ BLK_MQ_REQ_PREEMPT = (1 << 3), /* set RQF_PREEMPT */
};
struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,