Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422925AbWHYX43 (ORCPT ); Fri, 25 Aug 2006 19:56:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422927AbWHYX42 (ORCPT ); Fri, 25 Aug 2006 19:56:28 -0400 Received: from mga07.intel.com ([143.182.124.22]:27729 "EHLO azsmga101.ch.intel.com") by vger.kernel.org with ESMTP id S1422925AbWHYX41 (ORCPT ); Fri, 25 Aug 2006 19:56:27 -0400 X-ExtLoop1: 1 X-IronPort-AV: i="4.08,170,1154934000"; d="scan'208"; a="107788887:sNHT52182641" Date: Fri, 25 Aug 2006 16:56:19 -0700 From: Valerie Henson To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Akkana Peck , Mark Fasheh , Jesse Barnes , Arjan van de Ven , Chris Wedgewood , jsipek@cs.sunysb.edu, Al Viro , Christoph Hellwig , Adrian Bunk Subject: [patch] Relative atime - userspace Message-ID: <20060825235619.GB25003@goober> References: <20060825235215.820563000@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060825235215.820563000@linux.intel.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2361 Lines: 63 Add the "relatime" (relative atime) option support to mount. Relative atime only updates the atime if the previous atime is older than the mtime or ctime. Like noatime, but useful for applications like mutt that need to know when a file has been read since it was last modified. Signed-off-by: Valerie Henson --- mount/mount.8 | 7 +++++++ mount/mount.c | 6 ++++++ mount/mount_constants.h | 4 ++++ 3 files changed, 17 insertions(+) --- util-linux-2.13-pre7.orig/mount/mount.8 +++ util-linux-2.13-pre7/mount/mount.8 @@ -586,6 +586,13 @@ access on the news spool to speed up new .B nodiratime Do not update directory inode access times on this filesystem. .TP +.B relatime +Update inode access times relative to modify or change time. Access +time is only updated if the previous access time was earlier than the +current modify or change time. (Similar to noatime, but doesn't break +mutt or other applications that need to know if a file has been read +since the last time it was modified.) +.TP .B noauto Can only be mounted explicitly (i.e., the .B \-a --- util-linux-2.13-pre7.orig/mount/mount.c +++ util-linux-2.13-pre7/mount/mount.c @@ -164,6 +164,12 @@ static const struct opt_map opt_map[] = { "diratime", 0, 1, MS_NODIRATIME }, /* Update dir access times */ { "nodiratime", 0, 0, MS_NODIRATIME },/* Do not update dir access times */ #endif +#ifdef MS_RELATIME + { "relatime", 0, 0, MS_RELATIME }, /* Update access times relative to + mtime/ctime */ + { "norelatime", 0, 1, MS_RELATIME }, /* Update access time without regard + to mtime/ctime */ +#endif { NULL, 0, 0, 0 } }; --- util-linux-2.13-pre7.orig/mount/mount_constants.h +++ util-linux-2.13-pre7/mount/mount_constants.h @@ -57,6 +57,10 @@ if we have a stack or plain mount - moun #ifndef MS_VERBOSE #define MS_VERBOSE 0x8000 /* 32768 */ #endif +#ifndef MS_RELATIME +#define MS_RELATIME 0x200000 /* 200000: Update access times relative + to mtime/ctime */ +#endif /* * Magic mount flag number. Had to be or-ed to the flag values. */ - 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/