block: remove the minors argument to __alloc_disk_node

This was a leftover from the legacy alloc_disk interface.  Switch
the scsi ULPs and dasd to set ->minors directly like all other
drivers and remove the argument.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>	[dasd]
Link: https://lore.kernel.org/r/20210816131910.615153-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -3143,7 +3143,7 @@ struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata,
 	if (IS_ERR(q))
 		return ERR_CAST(q);
 
-	disk = __alloc_disk_node(0, set->numa_node, lkclass);
+	disk = __alloc_disk_node(set->numa_node, lkclass);
 	if (!disk) {
 		blk_cleanup_queue(q);
 		return ERR_PTR(-ENOMEM);

block/genhd.c

@@ -1254,8 +1254,7 @@ dev_t blk_lookup_devt(const char *name, int partno)
 	return devt;
 }
 
-struct gendisk *__alloc_disk_node(int minors, int node_id,
-		struct lock_class_key *lkclass)
+struct gendisk *__alloc_disk_node(int node_id, struct lock_class_key *lkclass)
 {
 	struct gendisk *disk;
 
@@ -1277,7 +1276,6 @@ struct gendisk *__alloc_disk_node(int minors, int node_id,
 	if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL))
 		goto out_destroy_part_tbl;
 
-	disk->minors = minors;
 	rand_initialize_disk(disk);
 	disk_to_dev(disk)->class = &block_class;
 	disk_to_dev(disk)->type = &disk_type;
@@ -1309,7 +1307,7 @@ struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass)
 	if (!q)
 		return NULL;
 
-	disk = __alloc_disk_node(0, node, lkclass);
+	disk = __alloc_disk_node(node, lkclass);
 	if (!disk) {
 		blk_cleanup_queue(q);
 		return NULL;

drivers/s390/block/dasd_genhd.c

@@ -40,14 +40,14 @@ int dasd_gendisk_alloc(struct dasd_block *block)
 	if (base->devindex >= DASD_PER_MAJOR)
 		return -EBUSY;
 
-	gdp = __alloc_disk_node(1 << DASD_PARTN_BITS, NUMA_NO_NODE,
-				&dasd_bio_compl_lkclass);
+	gdp = __alloc_disk_node(NUMA_NO_NODE, &dasd_bio_compl_lkclass);
 	if (!gdp)
 		return -ENOMEM;
 
 	/* Initialize gendisk structure. */
 	gdp->major = DASD_MAJOR;
 	gdp->first_minor = base->devindex << DASD_PARTN_BITS;
+	gdp->minors = 1 << DASD_PARTN_BITS;
 	gdp->fops = &dasd_device_operations;
 
 	/*

drivers/scsi/sd.c

@@ -3409,7 +3409,7 @@ static int sd_probe(struct device *dev)
 	if (!sdkp)
 		goto out;
 
-	gd = __alloc_disk_node(SD_MINORS, NUMA_NO_NODE, &sd_bio_compl_lkclass);
+	gd = __alloc_disk_node(NUMA_NO_NODE, &sd_bio_compl_lkclass);
 	if (!gd)
 		goto out_free;
 
@@ -3455,6 +3455,7 @@ static int sd_probe(struct device *dev)
 
 	gd->major = sd_major((index & 0xf0) >> 4);
 	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+	gd->minors = SD_MINORS;
 
 	gd->fops = &sd_fops;
 	gd->private_data = &sdkp->driver;

drivers/scsi/sr.c

@@ -714,7 +714,7 @@ static int sr_probe(struct device *dev)
 
 	kref_init(&cd->kref);
 
-	disk = __alloc_disk_node(1, NUMA_NO_NODE, &sr_bio_compl_lkclass);
+	disk = __alloc_disk_node(NUMA_NO_NODE, &sr_bio_compl_lkclass);
 	if (!disk)
 		goto fail_free;
 	mutex_init(&cd->lock);
@@ -731,6 +731,7 @@ static int sr_probe(struct device *dev)
 
 	disk->major = SCSI_CDROM_MAJOR;
 	disk->first_minor = minor;
+	disk->minors = 1;
 	sprintf(disk->disk_name, "sr%d", minor);
 	disk->fops = &sr_bdops;
 	disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;

include/linux/genhd.h

@@ -259,8 +259,7 @@ static inline sector_t get_capacity(struct gendisk *disk)
 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
 void blk_drop_partitions(struct gendisk *disk);
 
-struct gendisk *__alloc_disk_node(int minors, int node_id,
-		struct lock_class_key *lkclass);
+struct gendisk *__alloc_disk_node(int node_id, struct lock_class_key *lkclass);
 extern void put_disk(struct gendisk *disk);
 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);