From fc22617e451f23b466d4d63bb016f5f6111b69e4 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Sat, 21 Oct 2006 10:24:24 -0700
Subject: [PATCH] [PATCH] NFS: Cache invalidation fixup

If someone has renamed a directory on the server, triggering the d_move
code in d_materialise_unique(), then we need to invalidate the cached
directory information in the source parent directory.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Maneesh Soni <maneesh@in.ibm.com>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/nfs/dir.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 27b5a1051b..b34cd16f47 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -936,8 +936,14 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
 no_entry:
 	res = d_materialise_unique(dentry, inode);
 	if (res != NULL) {
+		struct dentry *parent;
 		if (IS_ERR(res))
 			goto out_unlock;
+		/* Was a directory renamed! */
+		parent = dget_parent(res);
+		if (!IS_ROOT(parent))
+			nfs_mark_for_revalidate(parent->d_inode);
+		dput(parent);
 		dentry = res;
 	}
 	nfs_renew_times(dentry);
-- 
2.39.5