| Message ID | 1459381857-1001-1-git-send-email-kamal@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0d4f7b1..a6917f0 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -6958,8 +6958,8 @@ 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
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-4.2.y-queue branch of the 4.2.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue This patch is scheduled to be released in version 4.2.8-ckt7. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 4.2.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ---8<------------------------------------------------------------ From b312592c05414147e679fd389dd49c84ccc1b9cd Mon Sep 17 00:00:00 2001 From: Jes Sorensen <Jes.Sorensen@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@redhat.com> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/md/raid5.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 2.7.4