block: split blk_zone_update_request_bio into two functions

blk_zone_update_request_bio() does two things. First it checks if the
request to be completed was written via ZONE APPEND and if yes it then
updates the sector to the one that the data was written to.

This is small enough to be an inline function. But upcoming changes adding
a tracepoint don't work if the function is inlined.

Split the function into two, the first is blk_req_bio_is_zone_append()
checking if the sector needs to be updated. This can still be an inline
function. The second is blk_zone_append_update_request_bio() doing the
sector update.

Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Johannes Thumshirn <[email protected]>

Author: morbidrsa

block/blk-mq.c

@@ -883,7 +883,8 @@ static void blk_complete_request(struct request *req)
 		/* Completion has already been traced */
 		bio_clear_flag(bio, BIO_TRACE_COMPLETION);
 
-		blk_zone_update_request_bio(req, bio);
+		if (blk_req_bio_is_zone_append(req, bio))
+			blk_zone_append_update_request_bio(req, bio);
 
 		if (!is_flush)
 			bio_endio(bio);
@@ -982,7 +983,8 @@ bool blk_update_request(struct request *req, blk_status_t error,
 
 		/* Don't actually finish bio if it's part of flush sequence */
 		if (!bio->bi_iter.bi_size) {
-			blk_zone_update_request_bio(req, bio);
+			if (blk_req_bio_is_zone_append(req, bio))
+				blk_zone_append_update_request_bio(req, bio);
 			if (!is_flush)
 				bio_endio(bio);
 		}

block/blk-zoned.c

@@ -1205,6 +1205,19 @@ static void disk_zone_wplug_unplug_bio(struct gendisk *disk,
 	spin_unlock_irqrestore(&zwplug->lock, flags);
 }
 
+void blk_zone_append_update_request_bio(struct request *rq, struct bio *bio)
+{
+	/*
+	 * For zone append requests, the request sector indicates the location
+	 * at which the BIO data was written. Return this value to the BIO
+	 * issuer through the BIO iter sector.
+	 * For plugged zone writes, which include emulated zone append, we need
+	 * the original BIO sector so that blk_zone_write_plug_bio_endio() can
+	 * lookup the zone write plug.
+	 */
+	bio->bi_iter.bi_sector = rq->__sector;
+}
+
 void blk_zone_write_plug_bio_endio(struct bio *bio)
 {
 	struct gendisk *disk = bio->bi_bdev->bd_disk;

block/blk.h

@@ -467,23 +467,15 @@ static inline bool bio_zone_write_plugging(struct bio *bio)
 {
 	return bio_flagged(bio, BIO_ZONE_WRITE_PLUGGING);
 }
-void blk_zone_write_plug_bio_merged(struct bio *bio);
-void blk_zone_write_plug_init_request(struct request *rq);
-static inline void blk_zone_update_request_bio(struct request *rq,
-					       struct bio *bio)
+static inline bool blk_req_bio_is_zone_append(struct request *rq,
+					      struct bio *bio)
 {
-	/*
-	 * For zone append requests, the request sector indicates the location
-	 * at which the BIO data was written. Return this value to the BIO
-	 * issuer through the BIO iter sector.
-	 * For plugged zone writes, which include emulated zone append, we need
-	 * the original BIO sector so that blk_zone_write_plug_bio_endio() can
-	 * lookup the zone write plug.
-	 */
-	if (req_op(rq) == REQ_OP_ZONE_APPEND ||
-	    bio_flagged(bio, BIO_EMULATES_ZONE_APPEND))
-		bio->bi_iter.bi_sector = rq->__sector;
+	return req_op(rq) == REQ_OP_ZONE_APPEND ||
+	       bio_flagged(bio, BIO_EMULATES_ZONE_APPEND);
 }
+void blk_zone_write_plug_bio_merged(struct bio *bio);
+void blk_zone_write_plug_init_request(struct request *rq);
+void blk_zone_append_update_request_bio(struct request *rq, struct bio *bio);
 void blk_zone_write_plug_bio_endio(struct bio *bio);
 static inline void blk_zone_bio_endio(struct bio *bio)
 {
@@ -516,14 +508,19 @@ static inline bool bio_zone_write_plugging(struct bio *bio)
 {
 	return false;
 }
+static inline bool blk_req_bio_is_zone_append(struct request *req,
+					      struct bio *bio)
+{
+	return false;
+}
 static inline void blk_zone_write_plug_bio_merged(struct bio *bio)
 {
 }
 static inline void blk_zone_write_plug_init_request(struct request *rq)
 {
 }
-static inline void blk_zone_update_request_bio(struct request *rq,
-					       struct bio *bio)
+static inline void blk_zone_append_update_request_bio(struct request *rq,
+						      struct bio *bio)
 {
 }
 static inline void blk_zone_bio_endio(struct bio *bio)