From: Eric Sandeen <sandeen@redhat.com>
Subject: [RHEL5 PATCH 1/2] FUSE: Minor vfs change
Date: Wed, 06 Jun 2007 14:03:05 -0500
Bugzilla: 193720
Message-Id: <466704E9.7000300@redhat.com>
Changelog: [fs] FUSE: Minor vfs change


For Bug 193720: Enable FUSE

This is a very minor change to the vfs for upstream fuse, 
and should not affect anyone else.

X-Git-Tag: v2.6.19-rc1~798
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=650a898342b3fa21c392c06a2b7010fa19823efa

[PATCH] vfs: define new lookup flag for chdir

In the "operation does permission checking" model used by fuse, chdir
permission is not checked, since there's no chdir method.

For this case set a lookup flag, which will be passed to ->permission(), so
fuse can distinguish it from permission checks for other operations.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

Index: linux-2.6.18-20.EL/fs/open.c
===================================================================
--- linux-2.6.18-20.EL.orig/fs/open.c
+++ linux-2.6.18-20.EL/fs/open.c
@@ -546,7 +546,8 @@ asmlinkage long sys_chdir(const char __u
 	struct nameidata nd;
 	int error;
 
-	error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
+	error = __user_walk(filename,
+			    LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
 	if (error)
 		goto out;
 
Index: linux-2.6.18-20.EL/include/linux/namei.h
===================================================================
--- linux-2.6.18-20.EL.orig/include/linux/namei.h
+++ linux-2.6.18-20.EL/include/linux/namei.h
@@ -56,6 +56,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LA
 #define LOOKUP_OPEN		(0x0100)
 #define LOOKUP_CREATE		(0x0200)
 #define LOOKUP_ACCESS		(0x0400)
+#define LOOKUP_CHDIR		(0x0800)
 
 extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
 extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));