725 static bool bd_may_claim(struct block_device *bdev, struct block_device *whole,  in bd_may_claim()  argument
735 	else if (whole->bd_holder == bd_may_claim)  in bd_may_claim()
737 	else if (whole->bd_holder != NULL)  in bd_may_claim()
762 			       struct block_device *whole, void *holder)  in bd_prepare_to_claim()  argument
766 	if (!bd_may_claim(bdev, whole, holder))  in bd_prepare_to_claim()
770 	if (whole->bd_claiming) {  in bd_prepare_to_claim()
771 		wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0);  in bd_prepare_to_claim()
813 	struct block_device *whole;  in bd_start_claiming()  local
835 		whole = bdget_disk(disk, 0);  in bd_start_claiming()
837 		whole = bdgrab(bdev);  in bd_start_claiming()
841 	if (!whole)  in bd_start_claiming()
847 	err = bd_prepare_to_claim(bdev, whole, holder);  in bd_start_claiming()
849 		whole->bd_claiming = holder;  in bd_start_claiming()
851 		return whole;  in bd_start_claiming()
854 		bdput(whole);  in bd_start_claiming()
1220 			struct block_device *whole;  in __blkdev_get()  local
1221 			whole = bdget_disk(disk, 0);  in __blkdev_get()
1223 			if (!whole)  in __blkdev_get()
1226 			ret = __blkdev_get(whole, mode, 1);  in __blkdev_get()
1229 			bdev->bd_contains = whole;  in __blkdev_get()
1311 	struct block_device *whole = NULL;  in blkdev_get()  local
1317 		whole = bd_start_claiming(bdev, holder);  in blkdev_get()
1318 		if (IS_ERR(whole)) {  in blkdev_get()
1320 			return PTR_ERR(whole);  in blkdev_get()
1326 	if (whole) {  in blkdev_get()
1327 		struct gendisk *disk = whole->bd_disk;  in blkdev_get()
1334 			BUG_ON(!bd_may_claim(bdev, whole, holder));  in blkdev_get()
1341 			whole->bd_holders++;  in blkdev_get()
1342 			whole->bd_holder = bd_may_claim;  in blkdev_get()
1348 		BUG_ON(whole->bd_claiming != holder);  in blkdev_get()
1349 		whole->bd_claiming = NULL;  in blkdev_get()
1350 		wake_up_bit(&whole->bd_claiming, 0);  in blkdev_get()
1368 		bdput(whole);  in blkdev_get()