linux-kernel - [NFS] Use a zero sized array for raw field in struct fid

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Message-Id: <1207659686.3635.278.camel@quoit>
Date:	Tue, 08 Apr 2008 14:01:26 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Adrian Bunk <bunk@...nel.org>,
	ChristophHellwig <hch@...radead.org>
Subject: [NFS] Use a zero sized array for raw field in struct fid

>>From b8732f8bea4e8abc331b8fa58a4047c91e2e7d02 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@...hat.com>
Date: Tue, 8 Apr 2008 13:12:52 +0100
Subject: [PATCH] [NFS] Use a zero sized array for raw field in struct fid

The raw field's size can vary so we use a zero sized array since
gcc will not allow a variable sized array inside a union. This
has been tested with ext3 and gfs2 and relates to the bug
report: http://lkml.org/lkml/2007/10/24/374 and discussion
thread: http://lkml.org/lkml/2008/4/7/65

Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Neil Brown <neilb@...e.de>
Cc: J. Bruce Fields <bfields@...ldses.org>
Cc: Adrian Bunk <bunk@...nel.org>

diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index adcbb05..de8387b 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -43,7 +43,7 @@ struct fid {
 			u32 parent_ino;
 			u32 parent_gen;
 		} i32;
-		__u32 raw[6];
+		__u32 raw[0];
 	};
 };
 
-- 
1.5.1.2



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