Man page 9 : ata_scsi_translate

ata_scsi_translate - Translate then issue SCSI command to ATA device

int ata_scsi_translate(struct ata_device *  dev , struct scsi_cmnd *  cmd , ata_xlat_func_t  xlat_func );

dev
    ATA device to which the command is addressed

cmd
    SCSI command to execute

xlat_func
    Actor which translates cmd to an ATA taskfile

Our ->queuecommand function has decided that the SCSI command issued can be directly translated into an ATA command, rather than handled internally.

This function sets up an ata_queued_cmd structure for the SCSI command, and sends that ata_queued_cmd to the hardware.

The xlat_func argument (actor) returns 0 if ready to execute ATA command, else 1 to finish translation. If 1 is returned then cmd->result (and possibly cmd->sense_buffer) are assumed to be set reflecting an error condition or clean (early) termination.

spin_lock_irqsave(host lock)

0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command needs to be deferred.

Jeff Garzik
    Author.