From: Sage Weil <sage@redhat.com>
Date: Fri, 4 Aug 2017 14:27:54 +0000 (-0400)
Subject: os/bluestore: fix dirty_shard off-by-one
X-Git-Tag: v13.0.0~147^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=db79734cd10335ccdc631b87393c07af9b4bf02b;p=ceph.git

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>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index e28f6e757fae..d4d95b3ab68f 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;