linux-kernel - [PATCH 04/25] Unionfs: cache-coherency fixes

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Message-Id: <1190776206791-git-send-email-ezk@cs.sunysb.edu>
Date:	Tue, 25 Sep 2007 23:09:43 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Olivier Blin <blino@...driva.com>,
	Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 04/25] Unionfs: cache-coherency fixes

From: Olivier Blin <blino@...driva.com>

Do not update mtime if there is no upper branch for the inode.  This
prevents from calling unionfs_lower_inode_idx() with a negative index, which
triggers a bug.

Signed-off-by: Olivier Blin <blino@...driva.com>
Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/fanout.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/unionfs/fanout.h b/fs/unionfs/fanout.h
index afeb9f6..51aa0de 100644
--- a/fs/unionfs/fanout.h
+++ b/fs/unionfs/fanout.h
@@ -308,7 +308,7 @@ static inline void unionfs_copy_attr_times(struct inode *upper)
 	int bindex;
 	struct inode *lower;
 
-	if (!upper)
+	if (!upper || ibstart(upper) < 0)
 		return;
 	for (bindex=ibstart(upper); bindex <= ibend(upper); bindex++) {
 		lower = unionfs_lower_inode_idx(upper, bindex);
-- 
1.5.2.2

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