[PATCH 1/5] block: Introduce the blk_rq_is_seq_write() function

[Bart Van Assche <bvanassche@acm.org>]

Introduce a function that makes it easy to verify whether a write
request is for a sequential write required or sequential write preferred
zone.

Cc: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 include/linux/blk-mq.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index e2d9daf7e8dd..3e7feb48105f 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -1129,6 +1129,15 @@ static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
 	return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
 }
 
+/**
+ * blk_rq_is_seq_write() - Whether @rq is a write request for a sequential zone.
+ * @rq: Request to examine.
+ */
+static inline bool blk_rq_is_seq_write(struct request *rq)
+{
+	return req_op(rq) == REQ_OP_WRITE && blk_rq_zone_is_seq(rq);
+}
+
 bool blk_req_needs_zone_write_lock(struct request *rq);
 bool blk_req_zone_write_trylock(struct request *rq);
 void __blk_req_zone_write_lock(struct request *rq);
@@ -1159,6 +1168,11 @@ static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
 	return !blk_req_zone_is_write_locked(rq);
 }
 #else /* CONFIG_BLK_DEV_ZONED */
+static inline bool blk_rq_is_seq_write(struct request *rq)
+{
+	return false;
+}
+
 static inline bool blk_req_needs_zone_write_lock(struct request *rq)
 {
 	return false;