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>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 56f6224fd6e6..d050e073e570 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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;