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authorNeilBrown <neilb@suse.de>2012-11-19 13:11:26 +1100
committerNeilBrown <neilb@suse.de>2012-11-20 19:42:56 +1100
commit4ac6875eeb97a49bad7bc8d56b5ec935904fc6e7 (patch)
tree3443bf90a75f43f118487bcb822ff5e511ee3e3b /drivers/md/raid5.c
parent5eff3c439d3478ba9e8ba5f8c0aaf6e6fadb6e58 (diff)
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md/raid5: round discard alignment up to power of 2.
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>
Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r--drivers/md/raid5.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c5439dc..baea94f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -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;
/*
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