From 31df8a3f2ef17d7cc53ff5778b32dd778aea5c5d Mon Sep 17 00:00:00 2001
From: yangsheng <yangsheng>
Date: Tue, 21 Apr 2009 14:42:04 +0000
Subject: [PATCH] Branch HEAD b=18810

i=bzzz, adilger

Use sb_bgl_lock to protect bitmaps.

Author: adilger
---
 lustre/ChangeLog | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lustre/ChangeLog b/lustre/ChangeLog
index 08d6c14..a9c1b8b 100644
--- a/lustre/ChangeLog
+++ b/lustre/ChangeLog
@@ -13,6 +13,17 @@ tbd  Sun Microsystems, Inc.
 	 removed cwd "./" (refer to Bugzilla 14399).
        * File join has been disabled in this release, refer to Bugzilla 16929.
 
+Severity   : major
+Frequency  : rare
+Bugzilla   : 18810
+Description: fix racy locking of mballoc block bitmaps causing BUG
+Details    : The locking of the mballoc buddy bitmap and the in-memory
+	     block bitmap was using two different spin locks in some
+	     cases.  This made it possible to incorrectly access the
+	     mballoc bitmap while another process was modifying it,
+	     causing a sanity assertion to fail.  While no on-disk corruption
+	     was reported, there was some risk of this happening.
+
 Severity   : normal
 Frequency  : rare, on llog test 6
 Bugzilla   : 16839
-- 
1.8.3.1