Commit b312592c authored by Jes Sorensen's avatar Jes Sorensen Committed by Kamal Mostafa

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

commit e7597e69 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: 620125f2 ("MD: raid5 trim support")
Signed-off-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
parent d390d1cd
......@@ -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
......
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