[3.16.y-ckt stable] Patch "dm raid: fix round up of default region size" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Thu Nov 12 16:45:29 UTC 2015
This is a note to let you know that I have just added a patch titled
dm raid: fix round up of default region size
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt20.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 8a0d1a56acd67366dbf449ec3b029b6c41f8267f Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka at redhat.com>
Date: Fri, 2 Oct 2015 11:17:37 -0400
Subject: dm raid: fix round up of default region size
commit 042745ee53a0a7c1f5aff191a4a24213c6dcfb52 upstream.
Commit 3a0f9aaee028 ("dm raid: round region_size to power of two")
intended to make sure that the default region size is a power of two.
However, the logic in that commit is incorrect and sets the variable
region_size to 0 or 1, depending on whether min_region_size is a power
of two.
Fix this logic, using roundup_pow_of_two(), so that region_size is
properly rounded up to the next power of two.
Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
Fixes: 3a0f9aaee028 ("dm raid: round region_size to power of two")
Signed-off-by: Mike Snitzer <snitzer at redhat.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
drivers/md/dm-raid.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 59715389b3cf..19cfd7affebe 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -325,8 +325,7 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
*/
if (min_region_size > (1 << 13)) {
/* If not a power of 2, make it the next power of 2 */
- if (min_region_size & (min_region_size - 1))
- region_size = 1 << fls(region_size);
+ region_size = roundup_pow_of_two(min_region_size);
DMINFO("Choosing default region size of %lu sectors",
region_size);
} else {
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