From: Sage Weil <sage@redhat.com>
Date: Thu, 3 Mar 2016 15:13:51 +0000 (-0500)
Subject: os/bluestore/BlueStore: do not cow_rmw_tail at or past eof
X-Git-Tag: v10.1.0~113^2~8
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=a2ecb1a88f721b3089901de76963f856dcbc0c9b;p=ceph.git

os/bluestore/BlueStore: do not cow_rmw_tail at or past eof

Signed-off-by: Sage Weil <sage@redhat.com>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index afca750451b1..078de2998b49 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -5174,7 +5174,8 @@ int BlueStore::_do_allocate(
     } else {
       dout(20) << "  tail shared, but no COW needed" << dendl;
     }
-    if (cow_offset_raw & ~block_mask) {
+    if (cow_offset_raw < o->onode.size &&
+	(cow_offset_raw & ~block_mask)) {
       *cow_rmw_tail = bp->second.offset + cow_offset_raw - bp->first;
       dout(20) << "  cow_rmw_tail " << *cow_rmw_tail
 	       << " from " << bp->second << dendl;