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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: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Martin K. Petersen 2010-09-10 01:23:18 -04:00 committed by Jeff Garzik
parent 9950110cf0
commit 02e0a60477
1 changed files with 14 additions and 0 deletions
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14
drivers/ata/libata-scsi.c
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@ -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;