Unfortunately, BUG_ON(IS_ROOT(dentry)) can happen inside
nfs_follow_mountpoint with NFS running Fedora 8 using a
specific setup.

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

Signed-off-by: Denis V. Lunev
CC: Trond Myklebust
CC: J. Bruce Fields
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__);
nd->path.dentry = dget(dentry);

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