From: dongdong tao <tdd21151186@gmail.com>
Date: Mon, 28 May 2018 21:44:59 +0000 (+0800)
Subject: osdc: Fix the wrong BufferHead offset
X-Git-Tag: v13.2.1~33^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F22869%2Fhead;p=ceph.git

osdc: Fix the wrong BufferHead offset

the BufferHead offset should be "opos - bh->start()"

Fixes: https://tracker.ceph.com/issues/24484
Signed-off-by: dongdong tao <tdd21151186@gmail.com>
(cherry picked from commit 10f3204cca240c7172aef94b16fde203b33a19fd)
---

diff --git a/src/osdc/ObjectCacher.cc b/src/osdc/ObjectCacher.cc
index 4b658408ab2c..249f24636f68 100644
--- a/src/osdc/ObjectCacher.cc
+++ b/src/osdc/ObjectCacher.cc
@@ -1729,7 +1729,7 @@ int ObjectCacher::writex(OSDWrite *wr, ObjectSet *oset, Context *onfreespace,
       ldout(cct, 10) << "writex writing " << f_it->first << "~"
 		     << f_it->second << " into " << *bh << " at " << opos
 		     << dendl;
-      uint64_t bhoff = bh->start() - opos;
+      uint64_t bhoff = opos - bh->start();
       assert(f_it->second <= bh->length() - bhoff);
 
       // get the frag we're mapping in