From: xie xingguo <xie.xingguo@zte.com.cn>
Date: Thu, 30 Jun 2016 11:31:45 +0000 (+0800)
Subject: os/bluestore: check against if tail_pad is already 0
X-Git-Tag: ses5-milestone5~554^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F9999%2Fhead;p=ceph.git

os/bluestore: check against if tail_pad is already 0

So we may skip the potential has_any_lextents() check.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 54cf1e23b2ab..f80795e1738c 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -5639,7 +5639,7 @@ void BlueStore::_do_write_small(
     }
     uint64_t tail_pad =
       ROUND_UP_TO(offset + length, chunk_size) - (offset + length);
-    if (o->onode.has_any_lextents(offset + length, tail_pad)) {
+    if (tail_pad && o->onode.has_any_lextents(offset + length, tail_pad)) {
       tail_pad = 0;
     }
     bufferlist padded = bl;