From: Zhiqiang Wang <zhiqiang.wang@intel.com>
Date: Wed, 2 Sep 2015 03:20:12 +0000 (+0800)
Subject: librbd: do write_full for whole object write
X-Git-Tag: v9.1.0~97^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=7bfb7f9025a8ee0d2305f49bf0336d2424da5b5b;p=ceph.git

librbd: do write_full for whole object write

This is useful when ec is the base tier in the cache tiering setup. The
write_full can be proxied from the cache tier to the base tier. So that
we don't need to promote the object.

Signed-off-by: Zhiqiang Wang <zhiqiang.wang@intel.com>
Suggested-by: Nick Fisk<nick@fisk.me.uk>
---

diff --git a/src/librbd/AioRequest.cc b/src/librbd/AioRequest.cc
index 0bfadc841b5a0..b6fc1f918a6a1 100644
--- a/src/librbd/AioRequest.cc
+++ b/src/librbd/AioRequest.cc
@@ -508,7 +508,11 @@ namespace librbd {
   void AioWrite::add_write_ops(librados::ObjectWriteOperation *wr) {
     if (m_ictx->enable_alloc_hint && !m_ictx->object_map.object_may_exist(m_object_no))
       wr->set_alloc_hint(m_ictx->get_object_size(), m_ictx->get_object_size());
-    wr->write(m_object_off, m_write_data);
+    if (m_object_off == 0 && m_object_len == m_ictx->get_object_size()) {
+      wr->write_full(m_write_data);
+    } else {
+      wr->write(m_object_off, m_write_data);
+    }
     wr->set_op_flags2(m_op_flags);
   }