static int sd_ioctl(struct block_device *bdev, fmode_t mode,
		    unsigned int cmd, unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdp = sdkp->device;
	void __user *p = (void __user *)arg;
	int error;
    
	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
				    "cmd=0x%x\n", disk->disk_name, cmd));

	error = scsi_verify_blk_ioctl(bdev, cmd);
	if (error < 0)
		return error;

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
	error = scsi_nonblockable_ioctl(sdp, cmd, p,
					(mode & FMODE_NDELAY) != 0);
	if (!scsi_block_when_processing_errors(sdp) || !error)
		goto out;

	/*
	 * Send SCSI addressing ioctls directly to mid level, send other
	 * ioctls to block level and then onto mid level if they can't be
	 * resolved.
	 */
	switch (cmd) {
		case SCSI_IOCTL_GET_IDLUN:
		case SCSI_IOCTL_GET_BUS_NUMBER:
			error = scsi_ioctl(sdp, cmd, p);
			break;
		default:
			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
			if (error != -ENOTTY)
				break;
			error = scsi_ioctl(sdp, cmd, p);
			break;
	}
out:
	return error;
}
static int sd_ioctl(struct block_device *bdev, fmode_t mode,
		    unsigned int cmd, unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdp = sdkp->device;
	void __user *p = (void __user *)arg;
	int error;
    
	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
				    "cmd=0x%x\n", disk->disk_name, cmd));

	error = scsi_verify_blk_ioctl(bdev, cmd);
	if (error < 0)
		return error;

	 
	error = scsi_nonblockable_ioctl(sdp, cmd, p,
					(mode & FMODE_NDELAY) != 0);
	if (!scsi_block_when_processing_errors(sdp) || !error)
		goto out;

	 
	switch (cmd) {
		case SCSI_IOCTL_GET_IDLUN:
		case SCSI_IOCTL_GET_BUS_NUMBER:
			error = scsi_ioctl(sdp, cmd, p);
			break;
		default:
			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
			if (error != -ENOTTY)
				break;
			error = scsi_ioctl(sdp, cmd, p);
			break;
	}
out:
	return error;
}