linux-kernel - [PATCH 1/1] nfs: BUG_ON in nfs_follow

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Date:	Mon, 11 Aug 2008 12:02:34 +0400
From:	"Denis V. Lunev" <den@...nvz.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	"Denis V. Lunev" <den@...nvz.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	"J. Bruce Fields" <bfields@...ldses.org>
Subject: [PATCH 1/1] nfs: BUG_ON in nfs_follow_mountpoint

Unfortunately, BUG_ON(IS_ROOT(dentry)) can happen inside
nfs_follow_mountpoint with NFS running Fedora 8 using a
specific setup.
https://bugzilla.redhat.com/show_bug.cgi?id=458622

So, the situation should be handled on NFS client gracefully.

Signed-off-by: Denis V. Lunev <den@...nvz.org>
CC: Trond Myklebust <Trond.Myklebust@...app.com>
CC: J. Bruce Fields <bfields@...ldses.org>
---
 fs/nfs/namespace.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 66df08d..4f11c13 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -105,7 +105,10 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
 
 	dprintk("--> nfs_follow_mountpoint()\n");
 
-	BUG_ON(IS_ROOT(dentry));
+	err = -ESTALE;
+	if (IS_ROOT(dentry))
+		goto out_err;
+
 	dprintk("%s: enter\n", __func__);
 	dput(nd->path.dentry);
 	nd->path.dentry = dget(dentry);
-- 
1.5.6.4

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