block: remove the revalidate_disk method

No implementations left.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210308074550.422714-4-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

Documentation/filesystems/locking.rst

@@ -469,7 +469,6 @@ prototypes::
 	int (*direct_access) (struct block_device *, sector_t, void **,
 				unsigned long *);
 	void (*unlock_native_capacity) (struct gendisk *);
-	int (*revalidate_disk) (struct gendisk *);
 	int (*getgeo)(struct block_device *, struct hd_geometry *);
 	void (*swap_slot_free_notify) (struct block_device *, unsigned long);
 
@@ -484,7 +483,6 @@ ioctl:			no
 compat_ioctl:		no
 direct_access:		no
 unlock_native_capacity:	no
-revalidate_disk:	no
 getgeo:			no
 swap_slot_free_notify:	no	(see below)
 ======================= ===================

fs/block_dev.c

@@ -1259,9 +1259,6 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate)
 		if (disk_part_scan_enabled(disk) ||
 		    !(disk->flags & GENHD_FL_REMOVABLE))
 			set_capacity(disk, 0);
-	} else {
-		if (disk->fops->revalidate_disk)
-			disk->fops->revalidate_disk(disk);
 	}
 
 	if (get_capacity(disk)) {

include/linux/blkdev.h

@@ -1870,7 +1870,6 @@ struct block_device_operations {
 	unsigned int (*check_events) (struct gendisk *disk,
 				      unsigned int clearing);
 	void (*unlock_native_capacity) (struct gendisk *);
-	int (*revalidate_disk) (struct gendisk *);
 	int (*getgeo)(struct block_device *, struct hd_geometry *);
 	int (*set_read_only)(struct block_device *bdev, bool ro);
 	/* this callback is with swap_lock and sometimes page table lock held */