linux-kernel - [PATCH vfs-2.6 6/6] vfs: add LOOKUP_RENAME

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Date:	Thu, 16 Oct 2008 07:50:29 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	viro@...iv.linux.org.uk
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hirofumi@...l.parknet.co.jp
Subject: [PATCH vfs-2.6 6/6] vfs: add LOOKUP_RENAME_TARGET intent


This adds LOOKUP_RENAME_TARGET intent for lookup of rename destination.

LOOKUP_RENAME_TARGET is going to be used like LOOKUP_CREATE. But since
the destination of rename() can be existing directory entry, so it has a
difference. Although that difference doesn't matter in my usage, this
tells it to user of this intent.

Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
---

 fs/namei.c            |    1 +
 include/linux/namei.h |    1 +
 2 files changed, 2 insertions(+)

diff -puN fs/namei.c~dcache-add-rename-intent fs/namei.c
--- vfs-2.6/fs/namei.c~dcache-add-rename-intent	2008-10-16 06:57:40.000000000 +0900
+++ vfs-2.6-hirofumi/fs/namei.c	2008-10-16 06:57:40.000000000 +0900
@@ -2654,6 +2654,7 @@ asmlinkage long sys_renameat(int olddfd,
 
 	oldnd.flags &= ~LOOKUP_PARENT;
 	newnd.flags &= ~LOOKUP_PARENT;
+	newnd.flags |= LOOKUP_RENAME_TARGET;
 
 	trap = lock_rename(new_dir, old_dir);
 
diff -puN include/linux/namei.h~dcache-add-rename-intent include/linux/namei.h
--- vfs-2.6/include/linux/namei.h~dcache-add-rename-intent	2008-10-16 06:57:40.000000000 +0900
+++ vfs-2.6-hirofumi/include/linux/namei.h	2008-10-16 06:58:05.000000000 +0900
@@ -54,6 +54,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LA
 #define LOOKUP_OPEN		0x0100
 #define LOOKUP_CREATE		0x0200
 #define LOOKUP_EXCL		0x0400
+#define LOOKUP_RENAME_TARGET	0x0800
 
 extern int user_path_at(int, const char __user *, unsigned, struct path *);
 
_
--
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