sd: open code revalidate_disk

Instead of calling revalidate_disk just do the work directly by
calling sd_revalidate_disk, and revalidate_disk_size where needed.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJosef Bacik <josef@toxicpanda.com>
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/scsi/sd.c

@@ -217,7 +217,7 @@ cache_type_store(struct device *dev, struct device_attribute *attr,
 			sd_print_sense_hdr(sdkp, &sshdr);
 		return -EINVAL;
 	}
-	revalidate_disk(sdkp->disk);
+	sd_revalidate_disk(sdkp->disk);
 	return count;
 }
 
@@ -1706,8 +1706,10 @@ static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
 static void sd_rescan(struct device *dev)
 {
 	struct scsi_disk *sdkp = dev_get_drvdata(dev);
+	int ret;
 
-	revalidate_disk(sdkp->disk);
+	ret = sd_revalidate_disk(sdkp->disk);
+	revalidate_disk_size(sdkp->disk, ret == 0);
 }
 
 static int sd_ioctl(struct block_device *bdev, fmode_t mode,