755 static bool bd_may_claim(struct block_device *bdev, struct block_device *whole,  in bd_may_claim()  argument
765 	else if (whole->bd_holder == bd_may_claim)  in bd_may_claim()
767 	else if (whole->bd_holder != NULL)  in bd_may_claim()
792 			       struct block_device *whole, void *holder)  in bd_prepare_to_claim()  argument
796 	if (!bd_may_claim(bdev, whole, holder))  in bd_prepare_to_claim()
800 	if (whole->bd_claiming) {  in bd_prepare_to_claim()
801 		wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0);  in bd_prepare_to_claim()
843 	struct block_device *whole;  in bd_start_claiming()  local
865 		whole = bdget_disk(disk, 0);  in bd_start_claiming()
867 		whole = bdgrab(bdev);  in bd_start_claiming()
871 	if (!whole)  in bd_start_claiming()
877 	err = bd_prepare_to_claim(bdev, whole, holder);  in bd_start_claiming()
879 		whole->bd_claiming = holder;  in bd_start_claiming()
881 		return whole;  in bd_start_claiming()
884 		bdput(whole);  in bd_start_claiming()
1251 			struct block_device *whole;  in __blkdev_get()  local
1252 			whole = bdget_disk(disk, 0);  in __blkdev_get()
1254 			if (!whole)  in __blkdev_get()
1257 			ret = __blkdev_get(whole, mode, 1);  in __blkdev_get()
1260 			bdev->bd_contains = whole;  in __blkdev_get()
1342 	struct block_device *whole = NULL;  in blkdev_get()  local
1348 		whole = bd_start_claiming(bdev, holder);  in blkdev_get()
1349 		if (IS_ERR(whole)) {  in blkdev_get()
1351 			return PTR_ERR(whole);  in blkdev_get()
1357 	if (whole) {  in blkdev_get()
1358 		struct gendisk *disk = whole->bd_disk;  in blkdev_get()
1365 			BUG_ON(!bd_may_claim(bdev, whole, holder));  in blkdev_get()
1372 			whole->bd_holders++;  in blkdev_get()
1373 			whole->bd_holder = bd_may_claim;  in blkdev_get()
1379 		BUG_ON(whole->bd_claiming != holder);  in blkdev_get()
1380 		whole->bd_claiming = NULL;  in blkdev_get()
1381 		wake_up_bit(&whole->bd_claiming, 0);  in blkdev_get()
1399 		bdput(whole);  in blkdev_get()