From 1bb39b8908dfc455d3bf7eb74c3ae50047bceacf Mon Sep 17 00:00:00 2001
From: green <green>
Date: Thu, 16 Sep 2004 18:13:48 +0000
Subject: [PATCH] r=adilger Patch from SuSE: revalidate_special() is called
 from link_path_walk as the last path component is (".."). In
 revalidate_special() we called

real_lookup(dentry->d_parent,&dentry->d_name, nd), which called cifs_lookup().
which doesnot initialises dentry->d_op pointer if there is no corresponding
inode to the dentry. cifs_lookup() returned NULL dentry with d_op() as NULL.

so, in the second iteration of the loop in revalidate_special() we have d_op
as NULL and hence the crash in

  if (!dentry->d_op->d_revalidate(dentry, nd)) {
---
 lustre/kernel_patches/patches/vfs_intent-2.6-suse.patch    | 2 +-
 lustre/kernel_patches/patches/vfs_intent-2.6-vanilla.patch | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lustre/kernel_patches/patches/vfs_intent-2.6-suse.patch b/lustre/kernel_patches/patches/vfs_intent-2.6-suse.patch
index f8781be..bff461f 100644
--- a/lustre/kernel_patches/patches/vfs_intent-2.6-suse.patch
+++ b/lustre/kernel_patches/patches/vfs_intent-2.6-suse.patch
@@ -101,9 +101,9 @@ Index: linux-2.6.5-12.1/fs/namei.c
 +	struct dentry *dentry = nd->dentry;
 +	int err, counter = 0;
 +
++ revalidate_again:
 +	if (!dentry->d_op || !dentry->d_op->d_revalidate)
 +		return 0;
-+ revalidate_again:
 +	if (!dentry->d_op->d_revalidate(dentry, nd)) {
 +		struct dentry *new;
 +		if ((err = permission(dentry->d_parent->d_inode, MAY_EXEC,nd)))
diff --git a/lustre/kernel_patches/patches/vfs_intent-2.6-vanilla.patch b/lustre/kernel_patches/patches/vfs_intent-2.6-vanilla.patch
index 90c1223..592f0e2 100644
--- a/lustre/kernel_patches/patches/vfs_intent-2.6-vanilla.patch
+++ b/lustre/kernel_patches/patches/vfs_intent-2.6-vanilla.patch
@@ -101,9 +101,9 @@ Index: linux-2.6.6-vanilla/fs/namei.c
 +	struct dentry *dentry = nd->dentry;
 +	int err, counter = 0;
 +
++ revalidate_again:
 +	if (!dentry->d_op || !dentry->d_op->d_revalidate)
 +		return 0;
-+ revalidate_again:
 +	if (!dentry->d_op->d_revalidate(dentry, nd)) {
 +		struct dentry *new;
 +		if ((err = permission(dentry->d_parent->d_inode, MAY_EXEC, nd)))
-- 
1.8.3.1