1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1af5ddd0f631..2147e2381a22 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -632,6 +632,7 @@ struct request_queue {
 #define QUEUE_FLAG_REGISTERED  26       /* queue has been registered to a disk */
 #define QUEUE_FLAG_SCSI_PASSTHROUGH 27  /* queue supports SCSI commands */
 #define QUEUE_FLAG_QUIESCED    28       /* queue has been quiesced */
+#define QUEUE_FLAG_PREEMPT_ONLY 29      /* only process REQ_PREEMPT requests */
 
 #define QUEUE_FLAG_DEFAULT      ((1 << QUEUE_FLAG_IO_STAT) |            \
                                  (1 << QUEUE_FLAG_SAME_COMP)    |       \
@@ -732,6 +733,11 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
         ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
                              REQ_FAILFAST_DRIVER))
 #define blk_queue_quiesced(q)   test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
+#define blk_queue_preempt_only(q)                               \
+        test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags)
+
+extern int blk_set_preempt_only(struct request_queue *q);
+extern void blk_clear_preempt_only(struct request_queue *q);
 
 static inline bool blk_account_rq(struct request *rq)
 {