Commit 042745ee authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm raid: fix round up of default region size

Commit 3a0f9aae

 ("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: default avatarMikulas Patocka <>
Fixes: 3a0f9aae

 ("dm raid: round region_size to power of two")
Cc: # v3.8+
Signed-off-by: default avatarMike Snitzer <>
parent 2a708cff
......@@ -329,8 +329,7 @@ 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",
} else {
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment