Patch "sd: Optimal I/O size is in bytes, not sectors" has been added to the 4.4-stable tree

Patch "sd: Optimal I/O size is in bytes, not sectors" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sd: Optimal I/O size is in bytes, not sectors

to the 4.4-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:
     sd-optimal-i-o-size-is-in-bytes-not-sectors.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d0eb20a863ba7dc1d3f4b841639671f134560be2 Mon Sep 17 00:00:00 2001
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Wed, 20 Jan 2016 11:01:23 -0500
Subject: sd: Optimal I/O size is in bytes, not sectors

From: Martin K. Petersen <martin.petersen@oracle.com>

commit d0eb20a863ba7dc1d3f4b841639671f134560be2 upstream.

Commit ca369d51b3e1 ("block/sd: Fix device-imposed transfer length
limits") accidentally switched optimal I/O size reporting from bytes to
block layer sectors.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: ca369d51b3e1649be4a72addd6d6a168cfb3f537
Reviewed-by: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/sd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2893,7 +2893,7 @@ static int sd_revalidate_disk(struct gen
 	    sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
 	    sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_CACHE_SIZE)
 		rw_max = q->limits.io_opt =
-			logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
+			sdkp->opt_xfer_blocks * sdp->sector_size;
 	else
 		rw_max = BLK_DEF_MAX_SECTORS;
 


Patches currently in stable-queue which might be from martin.petersen@oracle.com are

queue-4.4/sd-optimal-i-o-size-is-in-bytes-not-sectors.patch