This is a note to let you know that I've just added the patch titled
libata: Use Maximum Write Same Length to report discard size
to the 2.6.39-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libata-use-maximum-write-same-length-to-report-discard-size.patch
and it can be found in the queue-2.6.39 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 5f4e206666f834340b69ddb43f86de3851c8675a Mon Sep 17 00:00:00 2001
From: "Martin K. Petersen" <[email protected]>
Date: Tue, 17 May 2011 22:13:23 -0400
Subject: libata: Use Maximum Write Same Length to report discard size
limit
From: "Martin K. Petersen" <[email protected]>
commit 5f4e206666f834340b69ddb43f86de3851c8675a upstream.
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 <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/ata/libata-scsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2139,7 +2139,7 @@ static unsigned int ata_scsiop_inq_b0(st
* 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]);
}
Patches currently in stable-queue which might be from
[email protected] are
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