From: Haomai Wang <haomaiwang@gmail.com>
Date: Sun, 27 Jul 2014 05:37:49 +0000 (+0800)
Subject: Only write bufferhead when it's dirty
X-Git-Tag: v0.84~55^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F2149%2Fhead;p=ceph.git

Only write bufferhead when it's dirty

The TX state bh should be skipped because the bh should be inflight. We only
need to write dirty bh. And TX and dirty state bh both should be waited until
flushed.

Signed-off-by: Haomai Wang <haomaiwang@gmail.com>
---

diff --git a/src/osdc/ObjectCacher.cc b/src/osdc/ObjectCacher.cc
index ed18adc7e854..e7dfe18bb060 100644
--- a/src/osdc/ObjectCacher.cc
+++ b/src/osdc/ObjectCacher.cc
@@ -1621,7 +1621,10 @@ bool ObjectCacher::flush_set(ObjectSet *oset, Context *onfinish)
     next++;
     BufferHead *bh = *it;
     waitfor_commit.insert(bh->ob);
-    bh_write(bh);
+
+    if (bh->is_dirty())
+      bh_write(bh);
+
     it = next;
   }