412 int blk_alloc_devt(struct hd_struct *part, dev_t *devt)  in blk_alloc_devt()  argument
419 		*devt = MKDEV(disk->major, disk->first_minor + part->partno);  in blk_alloc_devt()
434 	*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));  in blk_alloc_devt()
447 void blk_free_devt(dev_t devt)  in blk_free_devt()  argument
449 	if (devt == MKDEV(0, 0))  in blk_free_devt()
452 	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {  in blk_free_devt()
454 		idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));  in blk_free_devt()
459 static char *bdevt_str(dev_t devt, char *buf)  in bdevt_str()  argument
461 	if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) {  in bdevt_str()
463 		snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt));  in bdevt_str()
466 		snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt));  in bdevt_str()
476 void blk_register_region(dev_t devt, unsigned long range, struct module *module,  in blk_register_region()  argument
480 	kobj_map(bdev_map, devt, range, module, probe, lock, data);  in blk_register_region()
485 void blk_unregister_region(dev_t devt, unsigned long range)  in blk_unregister_region()  argument
487 	kobj_unmap(bdev_map, devt, range);  in blk_unregister_region()
492 static struct kobject *exact_match(dev_t devt, int *partno, void *data)  in exact_match()  argument
499 static int exact_lock(dev_t devt, void *data)  in exact_lock()  argument
586 	dev_t devt;  in add_disk()  local
598 	retval = blk_alloc_devt(&disk->part0, &devt);  in add_disk()
603 	disk_to_dev(disk)->devt = devt;  in add_disk()
608 	disk->major = MAJOR(devt);  in add_disk()
609 	disk->first_minor = MINOR(devt);  in add_disk()
683 struct gendisk *get_gendisk(dev_t devt, int *partno)  in get_gendisk()  argument
687 	if (MAJOR(devt) != BLOCK_EXT_MAJOR) {  in get_gendisk()
690 		kobj = kobj_lookup(bdev_map, devt, partno);  in get_gendisk()
697 		part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));  in get_gendisk()
894 static struct kobject *base_probe(dev_t devt, int *partno, void *data)  in base_probe()  argument
896 	if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)  in base_probe()
898 		request_module("block-major-%d", MAJOR(devt));  in base_probe()
1111 	blk_free_devt(dev->devt);  in disk_release()
1222 	dev_t devt = MKDEV(0, 0);  in blk_lookup_devt()  local
1238 			devt = MKDEV(MAJOR(dev->devt),  in blk_lookup_devt()
1239 				     MINOR(dev->devt) + partno);  in blk_lookup_devt()
1244 			devt = part_devt(part);  in blk_lookup_devt()
1251 	return devt;  in blk_lookup_devt()