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| author | Jonathan Brassow <jbrassow@redhat.com> | 2012-12-21 20:23:33 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-12-21 20:23:33 +0000 |
| commit | 3a0f9aaee02857609d79b20c809c02a8b7c39d06 (patch) | |
| tree | 274ae68dfc2d955bb8f9a771388947e947b359b4 | |
| parent | 2aab38502d0e1bf6cf98183769e35a9ff999dcb1 (diff) | |
| download | blackbird-op-linux-3a0f9aaee02857609d79b20c809c02a8b7c39d06.tar.gz blackbird-op-linux-3a0f9aaee02857609d79b20c809c02a8b7c39d06.zip | |
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.c | 4 |
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 */ |
