+static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned command, unsigned long argument)
+{
+ struct blkfront_info *info = bdev->bd_disk->private_data;
+ int i;
+
+ dev_dbg(&info->xbdev->dev, "command: 0x%x, argument: 0x%lx\n",
+ command, (long)argument);
+
+ switch (command) {
+ case CDROMMULTISESSION:
+ dev_dbg(&info->xbdev->dev, "FIXME: support multisession CDs later\n");
+ for (i = 0; i < sizeof(struct cdrom_multisession); i++)
+ if (put_user(0, (char __user *)(argument + i)))
+ return -EFAULT;
+ return 0;
+
+ case CDROM_GET_CAPABILITY: {
+ struct gendisk *gd = info->gd;
+ if (gd->flags & GENHD_FL_CD)
+ return 0;
+ return -EINVAL;
+ }
+
+ default:
+ /*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
+ command);*/
+ return -EINVAL; /* same return as native Linux */
+ }
+
+ return 0;
+}
+