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Commit 8da10935 authored by mengcong's avatar mengcong Committed by Nicholas Bellinger
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target: Handle ATA_16 passthrough for pSCSI backend devices 



The cdrecord uses ATA_PASS_THROUGH_16 command while burning CDs
with a SATA CD-ROM. This patch adds support to it so that PSCSI
CD-ROM passthrough works with the cdrecord.

(nab: Add !passthrough check to prevent non pSCSI backends from ATA_16)

Signed-off-by: default avatarCong Meng <mc@linux.vnet.ibm.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 5b9a4d72

drivers/target/target_core_transport.c

+32 −0
Original line number Diff line number Diff line
@@ -2927,6 +2927,38 @@ static int transport_generic_cmd_sequencer( 
		size = (cdb[7] << 8) | cdb[8];

		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;

		break;

	case ATA_16:

		/* Only support ATA passthrough to pSCSI backends.. */

		if (!passthrough)

			goto out_unsupported_cdb;



		/* T_LENGTH */

		switch (cdb[2] & 0x3) {

		case 0x0:

			sectors = 0;

			break;

		case 0x1:

			sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];

			break;

		case 0x2:

			sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];

			break;

		case 0x3:

			pr_err("T_LENGTH=0x3 not supported for ATA_16\n");

			goto out_invalid_cdb_field;

		}



		/* BYTE_BLOCK */

		if (cdb[2] & 0x4) {

			/* BLOCK T_TYPE: 512 or sector */

			size = sectors * ((cdb[2] & 0x10) ?

				dev->se_sub_dev->se_dev_attrib.block_size : 512);

		} else {

			/* BYTE */

			size = sectors;

		}

		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;

		break;

	default:

		pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"

			" 0x%02x, sending CHECK_CONDITION.\n",