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Commit 02e0a604 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jeff Garzik
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libata: Signal that our SATL supports WRITE SAME(16) with UNMAP 



Until now identifying that a device supports WRITE SAME(16) with the
UNMAP bit set has been black magic.  Implement support for the SBC-3
Thin Provisioning VPD page and set the TPWS bit.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 9950110c

drivers/ata/libata-scsi.c

+14 −0
Original line number Diff line number Diff line
@@ -1972,6 +1972,7 @@ static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) 
		0x89,	/* page 0x89, ata info page */

		0xb0,	/* page 0xb0, block limits page */

		0xb1,	/* page 0xb1, block device characteristics page */

		0xb2,	/* page 0xb2, thin provisioning page */

	};



	rbuf[3] = sizeof(pages);	/* number of supported VPD pages */
@@ -2140,6 +2141,16 @@ static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) 
	return 0;

}



static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)

{

	/* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */

	rbuf[1] = 0xb2;

	rbuf[3] = 0x4;

	rbuf[5] = 1 << 6;	/* TPWS */



	return 0;

}



/**

 *	ata_scsiop_noop - Command handler that simply returns success.

 *	@args: device IDENTIFY data / SCSI command of interest.
@@ -3252,6 +3263,9 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd, 
		case 0xb1:

			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);

			break;

		case 0xb2:

			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);

			break;

		default:

			ata_scsi_invalid_field(cmd, done);

			break;