ata_sg_init(9) [centos man page]
ATA_SG_INIT(9) libata Library ATA_SG_INIT(9) NAME
ata_sg_init - Associate command with scatter-gather table. SYNOPSIS
void ata_sg_init(struct ata_queued_cmd * qc, struct scatterlist * sg, unsigned int n_elem); ARGUMENTS
qc Command to be associated sg Scatter-gather table. n_elem Number of elements in s/g table. DESCRIPTION
Initialize the data-related elements of queued_cmd qc to point to a scatter-gather table sg, containing n_elem elements. LOCKING
spin_lock_irqsave(host lock) AUTHOR
Jeff Garzik Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 ATA_SG_INIT(9)
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ATA_SCSI_TRANSLATE(9) libata SCSI translation/emulat ATA_SCSI_TRANSLATE(9) NAME
ata_scsi_translate - Translate then issue SCSI command to ATA device SYNOPSIS
int ata_scsi_translate(struct ata_device * dev, struct scsi_cmnd * cmd, void (*done) (struct scsi_cmnd *), ata_xlat_func_t xlat_func); ARGUMENTS
dev ATA device to which the command is addressed cmd SCSI command to execute done SCSI command completion function xlat_func Actor which translates cmd to an ATA taskfile DESCRIPTION
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. LOCKING
spin_lock_irqsave(host lock) RETURNS
0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command needs to be deferred. AUTHOR
Jeff Garzik Author. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 ATA_SCSI_TRANSLATE(9)