wrapper for access to ->bd_partno

On the next step it's going to get folded into a field where flags will go.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

block/early-lookup.c

@@ -78,7 +78,7 @@ static int __init devt_from_partuuid(const char *uuid_str, dev_t *devt)
 		 * to the partition number found by UUID.
 		 */
 		*devt = part_devt(dev_to_disk(dev),
-				  dev_to_bdev(dev)->bd_partno + offset);
+				  bdev_partno(dev_to_bdev(dev)) + offset);
 	} else {
 		*devt = dev->devt;
 	}

block/partitions/core.c

@@ -173,7 +173,7 @@ static struct parsed_partitions *check_partition(struct gendisk *hd)
 static ssize_t part_partition_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_partno);
+	return sprintf(buf, "%d\n", bdev_partno(dev_to_bdev(dev)));
 }
 
 static ssize_t part_start_show(struct device *dev,
@@ -250,7 +250,7 @@ static int part_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct block_device *part = dev_to_bdev(dev);
 
-	add_uevent_var(env, "PARTN=%u", part->bd_partno);
+	add_uevent_var(env, "PARTN=%u", bdev_partno(part));
 	if (part->bd_meta_info && part->bd_meta_info->volname[0])
 		add_uevent_var(env, "PARTNAME=%s", part->bd_meta_info->volname);
 	return 0;
@@ -267,7 +267,7 @@ void drop_partition(struct block_device *part)
 {
 	lockdep_assert_held(&part->bd_disk->open_mutex);
 
-	xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
+	xa_erase(&part->bd_disk->part_tbl, bdev_partno(part));
 	kobject_put(part->bd_holder_dir);
 
 	device_del(&part->bd_device);
@@ -338,8 +338,8 @@ static struct block_device *add_partition(struct gendisk *disk, int partno,
 	pdev->parent = ddev;
 
 	/* in consecutive minor range? */
-	if (bdev->bd_partno < disk->minors) {
-		devt = MKDEV(disk->major, disk->first_minor + bdev->bd_partno);
+	if (bdev_partno(bdev) < disk->minors) {
+		devt = MKDEV(disk->major, disk->first_minor + bdev_partno(bdev));
 	} else {
 		err = blk_alloc_ext_minor();
 		if (err < 0)
@@ -404,7 +404,7 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start,
 
 	rcu_read_lock();
 	xa_for_each_start(&disk->part_tbl, idx, part, 1) {
-		if (part->bd_partno != skip_partno &&
+		if (bdev_partno(part) != skip_partno &&
 		    start < part->bd_start_sect + bdev_nr_sectors(part) &&
 		    start + length > part->bd_start_sect) {
 			overlap = true;

include/linux/blkdev.h

@@ -720,6 +720,11 @@ void invalidate_disk(struct gendisk *disk);
 void set_disk_ro(struct gendisk *disk, bool read_only);
 void disk_uevent(struct gendisk *disk, enum kobject_action action);
 
+static inline u8 bdev_partno(const struct block_device *bdev)
+{
+	return bdev->bd_partno;
+}
+
 static inline int get_disk_ro(struct gendisk *disk)
 {
 	return disk->part0->bd_read_only ||
@@ -1095,7 +1100,7 @@ static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
 
 static inline bool bdev_is_partition(struct block_device *bdev)
 {
-	return bdev->bd_partno;
+	return bdev_partno(bdev) != 0;
 }
 
 enum blk_default_limits {

lib/vsprintf.c

@@ -972,7 +972,7 @@ char *bdev_name(char *buf, char *end, struct block_device *bdev,
 				*buf = 'p';
 			buf++;
 		}
-		buf = number(buf, end, bdev->bd_partno, spec);
+		buf = number(buf, end, bdev_partno(bdev), spec);
 	}
 	return buf;
 }