linux-kernel - Re: [RFC][PATCH 3/14] Add the whiteout file type

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Date:	Mon, 14 May 2007 22:39:58 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Blunck <j.blunck@...harburg.de>
Subject: Re: [RFC][PATCH  3/14] Add the whiteout file type


On May 14 2007 15:09, Bharata B Rao wrote:
>
>A white-out stops the VFS from further lookups of the white-outs name and
>returns -ENOENT. This is the same behaviour as if the filename isn't
>found. This can be used in combination with union mounts to virtually
>delete (white-out) files by creating a file with this file type.
>
>Signed-off-by: Jan Blunck <j.blunck@...harburg.de>
>Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
>---
> include/linux/stat.h |    2 ++
> 1 files changed, 2 insertions(+)
>
>--- a/include/linux/stat.h
>+++ b/include/linux/stat.h
>@@ -10,6 +10,7 @@
> #if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
> 
> #define S_IFMT  00170000
>+#define S_IFWHT  0160000	/* whiteout */
> #define S_IFSOCK 0140000
> #define S_IFLNK	 0120000
> #define S_IFREG  0100000

I wonder why 110000, 130000 or 150000 could not also be used?


	Jan
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