Use bdev_is_paritition() instead of open-coding it

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

block/blk-core.c

@@ -759,7 +759,8 @@ void submit_bio_noacct(struct bio *bio)
 	if (!bio_flagged(bio, BIO_REMAPPED)) {
 		if (unlikely(bio_check_eod(bio)))
 			goto end_io;
-		if (bdev->bd_partno && unlikely(blk_partition_remap(bio)))
+		if (bdev_is_partition(bdev) &&
+		    unlikely(blk_partition_remap(bio)))
 			goto end_io;
 	}
 
@@ -989,7 +990,7 @@ void update_io_ticks(struct block_device *part, unsigned long now, bool end)
 		if (likely(try_cmpxchg(&part->bd_stamp, &stamp, now)))
 			__part_stat_add(part, io_ticks, end ? now - stamp : 1);
 	}
-	if (part->bd_partno) {
+	if (bdev_is_partition(part)) {
 		part = bdev_whole(part);
 		goto again;
 	}

block/blk-mq.c

@@ -92,7 +92,7 @@ static bool blk_mq_check_inflight(struct request *rq, void *priv)
 	struct mq_inflight *mi = priv;
 
 	if (rq->part && blk_do_io_stat(rq) &&
-	    (!mi->part->bd_partno || rq->part == mi->part) &&
+	    (!bdev_is_partition(mi->part) || rq->part == mi->part) &&
 	    blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT)
 		mi->inflight[rq_data_dir(rq)]++;
 

include/linux/part_stat.h

@@ -59,7 +59,7 @@ static inline void part_stat_set_all(struct block_device *part, int value)
 
 #define part_stat_add(part, field, addnd)	do {			\
 	__part_stat_add((part), field, addnd);				\
-	if ((part)->bd_partno)						\
+	if (bdev_is_partition(part))					\
 		__part_stat_add(bdev_whole(part), field, addnd);	\
 } while (0)
 

lib/vsprintf.c

@@ -966,7 +966,7 @@ char *bdev_name(char *buf, char *end, struct block_device *bdev,
 
 	hd = bdev->bd_disk;
 	buf = string(buf, end, hd->disk_name, spec);
-	if (bdev->bd_partno) {
+	if (bdev_is_partition(bdev)) {
 		if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
 			if (buf < end)
 				*buf = 'p';