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authorJonathan Brassow <jbrassow@redhat.com>2012-12-21 20:23:33 +0000
committerAlasdair G Kergon <agk@redhat.com>2012-12-21 20:23:33 +0000
commit3a0f9aaee02857609d79b20c809c02a8b7c39d06 (patch)
tree274ae68dfc2d955bb8f9a771388947e947b359b4
parent2aab38502d0e1bf6cf98183769e35a9ff999dcb1 (diff)
downloadlinux-stericsson-3a0f9aaee02857609d79b20c809c02a8b7c39d06.tar.gz
dm raid: round region_size to power of two
If the user does not supply a bitmap region_size to the dm raid target, a reasonable size is computed automatically. If this is not a power of 2, the md code will report an error later. This patch catches the problem early and rounds the region_size to the next power of two. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
-rw-r--r--drivers/md/dm-raid.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 45d94a7e7f6d..4a20bf8c72da 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -295,9 +295,11 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
* Choose a reasonable default. All figures in sectors.
*/
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);
DMINFO("Choosing default region size of %lu sectors",
region_size);
- region_size = min_region_size;
} else {
DMINFO("Choosing default region size of 4MiB");
region_size = 1 << 13; /* sectors */