From db79734cd10335ccdc631b87393c07af9b4bf02b Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Fri, 4 Aug 2017 10:27:54 -0400
Subject: [PATCH] os/bluestore: fix dirty_shard off-by-one

If we dirty an extent that abuts the end of a
shard, we should not dirty the next shard too.

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/os/bluestore/BlueStore.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index e28f6e757fa..d4d95b3ab68 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -2676,7 +2676,10 @@ void BlueStore::ExtentMap::dirty_range(
     return;
   }
   auto start = seek_shard(offset);
-  auto last = seek_shard(offset + length);
+  if (length == 0) {
+    length = 1;
+  }
+  auto last = seek_shard(offset + length - 1);
   if (start < 0)
     return;
 
-- 
2.39.5