Man page 9 : ata_cmd_ioctl

ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl

int ata_cmd_ioctl(struct scsi_device *  scsidev , void __user *  arg );

scsidev
    Device to which we are issuing command

arg
    User provided data for issuing command

Defined by the SCSI layer. We donAqt really care.

Zero on success, negative errno on error.

Jeff Garzik
    Author.