From e7597e69dec59b65c5525db1626b9d34afdfa678 Mon Sep 17 00:00:00 2001 From: Jes Sorensen Date: Tue, 16 Feb 2016 16:44:24 -0500 Subject: md/raid5: Compare apples to apples (or sectors to sectors) '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") Cc: stable@vger.kernel.org v3.7+ Signed-off-by: Jes Sorensen Signed-off-by: Shaohua Li diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b4f02c9..7f770b0 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7014,8 +7014,8 @@ static int raid5_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 -- cgit v0.10.2