From: Loic Dachary <ldachary@redhat.com>
Date: Tue, 2 Dec 2014 01:04:14 +0000 (+0100)
Subject: common: allow size alignment that is not a power of two
X-Git-Tag: v0.87.1~15^2~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=5205d4dacf7ebe2e42d2294bc30cb27f226c8d22;p=ceph.git

common: allow size alignment that is not a power of two

Do not assume the alignment is a power of two in the is_n_align_sized()
predicate. When used in the context of erasure code it is common
for chunks to not be powers of two.

Signed-off-by: Loic Dachary <loic@dachary.org>
(cherry picked from commit 73ad2d63d479b09037d50246106bbd4075fbce80)
---

diff --git a/src/include/buffer.h b/src/include/buffer.h
index 3cd0a7a19a07..0ce133a29641 100644
--- a/src/include/buffer.h
+++ b/src/include/buffer.h
@@ -184,7 +184,7 @@ public:
     bool is_page_aligned() const { return is_aligned(CEPH_PAGE_SIZE); }
     bool is_n_align_sized(unsigned align) const
     {
-      return (length() & (align-1)) == 0;
+      return (length() % align) == 0;
     }
     bool is_n_page_sized() const { return is_n_align_sized(CEPH_PAGE_SIZE); }