scsi_debug: virtual_gb ignores sector_size

commit 5447ed6c upstream.

In the scsi_debug driver, the virtual_gb option ignores the
sector_size, implicitly assuming that is 512 bytes.  So if
'virtual_gb=1 sector_size=4096' the result is an 8 GB (virtual) disk.
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/scsi/scsi_debug.c

@@ -914,7 +914,8 @@ static int resp_start_stop(struct scsi_cmnd * scp,
 static sector_t get_sdebug_capacity(void)
 {
 	if (scsi_debug_virtual_gb > 0)
-		return 2048 * 1024 * (sector_t)scsi_debug_virtual_gb;
+		return (sector_t)scsi_debug_virtual_gb *
+			(1073741824 / scsi_debug_sector_size);
 	else
 		return sdebug_store_sectors;
 }