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

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'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: 620125f2bf ("MD: raid5 trim support")
Cc: stable@vger.kernel.org v3.7+
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Jes Sorensen 2016-02-16 16:44:24 -05:00 committed by Shaohua Li
parent 6dc390ad61
commit e7597e69de
1 changed files with 2 additions and 2 deletions
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4
drivers/md/raid5.c
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@ -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