32 /* for extended dynamic devt allocation, currently only one major is used */
397 	int major;  member
402 static inline int major_to_index(unsigned major)  in major_to_index()  argument
404 	return major % BLKDEV_MAJOR_HASH_SIZE;  in major_to_index()
414 		if (dp->major == offset)  in blkdev_show()
415 			seq_printf(seqf, "%3d %s\n", dp->major, dp->name);  in blkdev_show()
423  * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If
424  *         @major = 0, try to allocate any unused major number.
429  * The return value depends on the @major input parameter:
431  *  - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1]
433  *  - if any unused major number was requested with @major = 0 parameter
434  *    then the return value is the allocated major number in range
438  * major numbers.
440 int register_blkdev(unsigned int major, const char *name)  in register_blkdev()  argument
448 	if (major == 0) {  in register_blkdev()
455 			printk("%s: failed to get major for %s\n",  in register_blkdev()
460 		major = index;  in register_blkdev()
461 		ret = major;  in register_blkdev()
464 	if (major >= BLKDEV_MAJOR_MAX) {  in register_blkdev()
465 		pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n",  in register_blkdev()
466 		       __func__, major, BLKDEV_MAJOR_MAX-1, name);  in register_blkdev()
478 	p->major = major;  in register_blkdev()
481 	index = major_to_index(major);  in register_blkdev()
484 		if ((*n)->major == major)  in register_blkdev()
493 		printk("register_blkdev: cannot get major %u for %s\n",  in register_blkdev()
494 		       major, name);  in register_blkdev()
504 void unregister_blkdev(unsigned int major, const char *name)  in unregister_blkdev()  argument
508 	int index = major_to_index(major);  in unregister_blkdev()
512 		if ((*n)->major == major)  in unregister_blkdev()
581 		*devt = MKDEV(disk->major, disk->first_minor + part->partno);  in blk_alloc_devt()
614 	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {  in blk_free_devt()
626 	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {  in blk_invalidate_devt()
635 	if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) {  in bdevt_str()
637 		snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt));  in bdevt_str()
640 		snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt));  in bdevt_str()
790 	WARN_ON(disk->minors && !(disk->major || disk->first_minor));  in __device_add_disk()
801 	disk->major = MAJOR(devt);  in __device_add_disk()
820 		ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt));  in __device_add_disk()
998 	if (MAJOR(devt) != BLOCK_EXT_MAJOR) {  in get_gendisk()
1169 		seq_puts(seqf, "major minor  #blocks  name\n\n");  in show_partition_start()
1191 			   MAJOR(part_devt(part)), MINOR(part_devt(part)),  in show_partition()
1210 	if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)  in base_probe()
1212 		request_module("block-major-%d", MAJOR(devt));  in base_probe()
1610 		seq_puts(seqf,	"major minor name"  in diskstats_show()
1631 			   MAJOR(part_devt(hd)), MINOR(part_devt(hd)),  in diskstats_show()
1699 			devt = MKDEV(MAJOR(dev->devt),  in blk_lookup_devt()