libata: Report zeroed read after TRIM and max discard size
Our current TRIM payload is a single sector that can accommodate 64 *
65535 blocks being unmapped. Report this value in the Block Limits
Maximum Unmap LBA count field.
If a storage device supports TRIM and the DRAT and RZAT bits are set,
report TPRZ=1 in Read Capacity(16).
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 340a616d..e1e186b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2115,8 +2115,10 @@
* that we support some form of unmap - in thise case via WRITE SAME
* with the unmap bit set.
*/
- if (ata_id_has_trim(args->id))
+ if (ata_id_has_trim(args->id)) {
+ put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
put_unaligned_be32(1, &rbuf[28]);
+ }
return 0;
}
@@ -2411,8 +2413,12 @@
rbuf[14] = (lowest_aligned >> 8) & 0x3f;
rbuf[15] = lowest_aligned;
- if (ata_id_has_trim(args->id))
- rbuf[14] |= 0x80;
+ if (ata_id_has_trim(args->id)) {
+ rbuf[14] |= 0x80; /* TPE */
+
+ if (ata_id_has_zero_after_trim(args->id))
+ rbuf[14] |= 0x40; /* TPRZ */
+ }
}
return 0;
