From 5a2b36f1e2cccb1d452a20659114ccdbf77b1536 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Thu, 17 Mar 2016 17:41:56 -0400
Subject: [PATCH] os/bluestore: only use tail if tail_offset matches

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/os/bluestore/BlueStore.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index ca1f93d3520..8af1c6a7547 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -5466,6 +5466,7 @@ int BlueStore::_do_write(
     if (offset >= bp->first &&
 	offset > tail_start &&
 	offset + length >= o->onode.size &&
+	o->tail_offset == tail_start &&
 	o->tail_bl.length() &&
 	(offset / block_size == (o->onode.size - 1) / block_size)) {
       dout(20) << __func__ << " using cached tail" << dendl;