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md/raid5: round discard alignment up to power of 2.

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blkdev_issue_discard currently assumes that the granularity
is a power of 2.  So in raid5, round the chosen number up to
avoid embarrassment.

Cc: Shaohua Li <shli@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-11-19 13:11:26 +11:00
parent 5eff3c439d
commit 4ac6875eeb
1 changed files with 4 additions and 0 deletions
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drivers/md/raid5.c
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@ -5529,6 +5529,10 @@ static int run(struct mddev *mddev)
* discard data disk but write parity disk
*/
stripe = stripe * PAGE_SIZE;
/* Round up to power of 2, as discard handling
* currently assumes that */
while ((stripe-1) & stripe)
stripe = (stripe | (stripe-1)) + 1;
mddev->queue->limits.discard_alignment = stripe;
mddev->queue->limits.discard_granularity = stripe;
/*