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target: Handle ATA_16 passthrough for pSCSI backend devices

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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: Cong Meng <mc@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
mengcong 2012-05-17 11:14:46 +08:00 committed by Nicholas Bellinger
parent 5b9a4d7280
commit 8da10935bc
1 changed files with 32 additions and 0 deletions
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32
drivers/target/target_core_transport.c
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@ -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",