Re: [PATCH] V2: target: Handle ATA_PASS_THROUGH_16 passthrough

[mengcong <mc@linux.vnet.ibm.com>]

On Wed, 2012-05-16 at 23:13 -0700, Nicholas A. Bellinger wrote:
> On Thu, 2012-05-17 at 11:14 +0800, mengcong wrote:
> > 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.
> > 
> > Signed-off-by: Cong Meng <mc@linux.vnet.ibm.com>
> > ---
> >  drivers/target/target_core_transport.c |   30 ++++++++++++++++++++++++++++++
> >  1 files changed, 30 insertions(+), 0 deletions(-)
> > 
> 
> Ok, I've added the extra !passthrough check to enforce pSCSI backends
> only usage + /* ... */ style comments changes mentioned as feedback you
> missed in the last mail.  (That's OK this time, but please don't get
> into the habit of ignoring patch feedback..)

Sorry to the ignoreance of the feedback. My client gets new mail with
problem sometimes. 

About the passthrough check, I explains in my last mail. 

Thanks.
mc.

> 
> So committed into lio-core.git, and queuing shortly into
> target-pending/for-next to be picked up for tomorrow's linux-next build.
> 
> Thanks for your patch MC!
> 
> --nab
> 
> > diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
> > index 2d75c29..25e0fc0 100644
> > --- a/drivers/target/target_core_transport.c
> > +++ b/drivers/target/target_core_transport.c
> > @@ -2926,6 +2926,36 @@ 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:
> > +		// 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\n");
> > +			goto out_invalid_cdb_field;
> > +			break;
> > +		}
> > +		
> > +		// 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",
> 
>