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

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commit e7597e69de 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: 620125f2bf ("MD: raid5 trim support")
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jes Sorensen 2016-02-16 16:44:24 -05:00 committed by Greg Kroah-Hartman
parent 2b9eb2b223
commit fad8b6fc04
1 changed files with 2 additions and 2 deletions
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4
drivers/md/raid5.c
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@ -7015,8 +7015,8 @@ 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