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libata: Use Maximum Write Same Length to report discard size limit

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Previously we used Maximum Unmap LBA Count in the Block Limits VPD to
signal the maximum number of sectors we could handle in a single Write
Same command.

Starting with SBC3r26 the Block Limits VPD has an explicit limit on the
number of blocks in a Write Same. This means we can stop abusing a field
related to the Unmap command and let our SAT use the proper value in the
VPD (Maximum Write Same Length).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Cc: stable@kernel.org
This commit is contained in:
Martin K. Petersen 2011-05-17 22:13:23 -04:00 committed by Jeff Garzik
parent f68b3afe45
commit 5f4e206666
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-scsi.c
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@ -2138,7 +2138,7 @@ static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
* with the unmap bit set.
*/
if (ata_id_has_trim(args->id)) {
put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
put_unaligned_be32(1, &rbuf[28]);
}