Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762226AbXENJca (ORCPT ); Mon, 14 May 2007 05:32:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757407AbXENJcV (ORCPT ); Mon, 14 May 2007 05:32:21 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:40563 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755836AbXENJcU (ORCPT ); Mon, 14 May 2007 05:32:20 -0400 Date: Mon, 14 May 2007 15:09:43 +0530 From: Bharata B Rao To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, Jan Blunck Subject: [RFC][PATCH 3/14] Add the whiteout file type Message-ID: <20070514093943.GE4139@in.ibm.com> Reply-To: bharata@linux.vnet.ibm.com References: <20070514093722.GB4139@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070514093722.GB4139@in.ibm.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1329 Lines: 37 From: Jan Blunck Subject: Add the whiteout file type 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 Signed-off-by: Bharata B Rao --- 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 @@ -28,6 +29,7 @@ #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK) #define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) #define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK) +#define S_ISWHT(m) (((m) & S_IFMT) == S_IFWHT) #define S_IRWXU 00700 #define S_IRUSR 00400 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/