488 int blk_alloc_devt(struct hd_struct *part, dev_t *devt)  in blk_alloc_devt()  argument
495 		*devt = MKDEV(disk->major, disk->first_minor + part->partno);  in blk_alloc_devt()
510 	*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));  in blk_alloc_devt()
523 void blk_free_devt(dev_t devt)  in blk_free_devt()  argument
525 	if (devt == MKDEV(0, 0))  in blk_free_devt()
528 	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {  in blk_free_devt()
530 		idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));  in blk_free_devt()
538 void blk_invalidate_devt(dev_t devt)  in blk_invalidate_devt()  argument
540 	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {  in blk_invalidate_devt()
542 		idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt)));  in blk_invalidate_devt()
547 static char *bdevt_str(dev_t devt, char *buf)  in bdevt_str()  argument
549 	if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) {  in bdevt_str()
551 		snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt));  in bdevt_str()
554 		snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt));  in bdevt_str()
564 void blk_register_region(dev_t devt, unsigned long range, struct module *module,  in blk_register_region()  argument
568 	kobj_map(bdev_map, devt, range, module, probe, lock, data);  in blk_register_region()
573 void blk_unregister_region(dev_t devt, unsigned long range)  in blk_unregister_region()  argument
575 	kobj_unmap(bdev_map, devt, range);  in blk_unregister_region()
580 static struct kobject *exact_match(dev_t devt, int *partno, void *data)  in exact_match()  argument
587 static int exact_lock(dev_t devt, void *data)  in exact_lock()  argument
695 	dev_t devt;  in __device_add_disk()  local
717 	retval = blk_alloc_devt(&disk->part0, &devt);  in __device_add_disk()
722 	disk->major = MAJOR(devt);  in __device_add_disk()
723 	disk->first_minor = MINOR(devt);  in __device_add_disk()
738 		disk_to_dev(disk)->devt = devt;  in __device_add_disk()
871 struct gendisk *get_gendisk(dev_t devt, int *partno)  in get_gendisk()  argument
875 	if (MAJOR(devt) != BLOCK_EXT_MAJOR) {  in get_gendisk()
878 		kobj = kobj_lookup(bdev_map, devt, partno);  in get_gendisk()
885 		part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));  in get_gendisk()
1086 static struct kobject *base_probe(dev_t devt, int *partno, void *data)  in base_probe()  argument
1088 	if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)  in base_probe()
1090 		request_module("block-major-%d", MAJOR(devt));  in base_probe()
1327 	blk_free_devt(dev->devt);  in disk_release()
1431 	dev_t devt = MKDEV(0, 0);  in blk_lookup_devt()  local
1447 			devt = MKDEV(MAJOR(dev->devt),  in blk_lookup_devt()
1448 				     MINOR(dev->devt) + partno);  in blk_lookup_devt()
1453 			devt = part_devt(part);  in blk_lookup_devt()
1460 	return devt;  in blk_lookup_devt()