zram: use set_capacity_and_notify

Use set_capacity_and_notify to set the size of both the disk and block
device.  This also gets the uevent notifications for the resize for free.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/zram/zram_drv.c

@@ -1695,7 +1695,7 @@ static void zram_reset_device(struct zram *zram)
 	disksize = zram->disksize;
 	zram->disksize = 0;
 
-	set_capacity(zram->disk, 0);
+	set_capacity_and_notify(zram->disk, 0);
 	part_stat_set_all(&zram->disk->part0, 0);
 
 	up_write(&zram->init_lock);
@@ -1741,9 +1741,7 @@ static ssize_t disksize_store(struct device *dev,
 
 	zram->comp = comp;
 	zram->disksize = disksize;
-	set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
-
-	revalidate_disk_size(zram->disk, true);
+	set_capacity_and_notify(zram->disk, zram->disksize >> SECTOR_SHIFT);
 	up_write(&zram->init_lock);
 
 	return len;
@@ -1790,7 +1788,6 @@ static ssize_t reset_store(struct device *dev,
 	/* Make sure all the pending I/O are finished */
 	fsync_bdev(bdev);
 	zram_reset_device(zram);
-	revalidate_disk_size(zram->disk, true);
 	bdput(bdev);
 
 	mutex_lock(&bdev->bd_mutex);