[3.16.y-ckt stable] Patch "md/raid5: Compare apples to apples (or sectors to sectors)" has been added to the 3.16.y-ckt tree

Luis Henriques luis.henriques at canonical.com
Mon Apr 11 17:21:59 UTC 2016


This is a note to let you know that I have just added a patch titled

    md/raid5: Compare apples to apples (or sectors to sectors)

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt27.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

---8<------------------------------------------------------------

>From 6bbd5301f512917d0e345e38c56b1f490530b50f Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen at redhat.com>
Date: Tue, 16 Feb 2016 16:44:24 -0500
Subject: md/raid5: Compare apples to apples (or sectors to sectors)

commit e7597e69dec59b65c5525db1626b9d34afdfa678 upstream.

'max_discard_sectors' is in sectors, while 'stripe' is in bytes.

This fixes the problem where DISCARD would get disabled on some larger
RAID5 configurations (6 or more drives in my testing), while it worked
as expected with smaller configurations.

Fixes: 620125f2bf8 ("MD: raid5 trim support")
Signed-off-by: Jes Sorensen <Jes.Sorensen at redhat.com>
Signed-off-by: Shaohua Li <shli at fb.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/md/raid5.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f90752ce95dc..9d9d757a3488 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6264,8 +6264,8 @@ static int run(struct mddev *mddev)
 		}

 		if (discard_supported &&
-		   mddev->queue->limits.max_discard_sectors >= stripe &&
-		   mddev->queue->limits.discard_granularity >= stripe)
+		    mddev->queue->limits.max_discard_sectors >= (stripe >> 9) &&
+		    mddev->queue->limits.discard_granularity >= stripe)
 			queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
 						mddev->queue);
 		else




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