From owner-freebsd-hackers@FreeBSD.ORG Wed May 12 19:25:30 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7DE561065676 for ; Wed, 12 May 2010 19:25:30 +0000 (UTC) (envelope-from pluknet@gmail.com) Received: from mail-yw0-f181.google.com (mail-yw0-f181.google.com [209.85.211.181]) by mx1.freebsd.org (Postfix) with ESMTP id 307D48FC13 for ; Wed, 12 May 2010 19:25:29 +0000 (UTC) Received: by ywh11 with SMTP id 11so186904ywh.7 for ; Wed, 12 May 2010 12:25:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=VXUv5XFfz5wkb1hedo3ntPsKY73Z4ybBDnxQ6sbLOyw=; b=PmYROGl3Tl/eoVHqv7Ix/ttagxGDfqL2O7VX9kzIp8WNG5e2Yuw1JE5z6tBCJAZXvw GJFMCWQszB2cmupkVIhDb2Ly+rc8x4Qz5oZ8/Z6W+4jYRn4Mpqxe5zEadyyMDq1El0FE wHmXQevEzhXopl1BDCUgXqzEu2+nsMuYZTdCY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=miXgDMU0HPVP9KW0iRyw/OstGO0uqtYn9VWca1A+d68dC9X+ykI43E/8ZQe2Sza/1X W8zfzS2+4TkJC0d+UnLL1KwY3O5MwrlxKySNtoOYP6ofH6VYHCNTCNEtoJWEzsAtNQEc l0wcKJzysViPws3PLXvtLCBMo7HGcHeukUF4A= MIME-Version: 1.0 Received: by 10.101.5.15 with SMTP id h15mr4993385ani.81.1273692325616; Wed, 12 May 2010 12:25:25 -0700 (PDT) Received: by 10.100.208.9 with HTTP; Wed, 12 May 2010 12:25:25 -0700 (PDT) In-Reply-To: <20100512203825.1db158db@ernst.jennejohn.org> References: <20100512203825.1db158db@ernst.jennejohn.org> Date: Wed, 12 May 2010 23:25:25 +0400 Message-ID: From: pluknet To: gljennjohn@googlemail.com Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-hackers@freebsd.org, Knowledge Seeker Subject: Re: utimes(2): changing the birth time X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2010 19:25:30 -0000 On 12 May 2010 22:38, Gary Jennejohn wrote: > On Wed, 12 May 2010 17:53:38 +0000 > Knowledge Seeker wrote: > >> Hi, >> Is there a way to set birth time to a value greater(newer) than the actu= al >> birth time (not in the future, but not the current time)? >> The man page utimes(2) says that is only possible to change to an older >> value. >> >> I saw a way to do this by opening a new file, coping the data, setting t= he >> other attributes, then calling utimes 2 times to set the birth and the >> modification time. >> >> Is there a way to change it without creating a new file? >> > > Not with the current code. =A0vfs_syscalls.c:setutimes() explicitly check= s > that the new time is less than va_birthtime. > > Interestingly enough, there's code in the routine to handle what this > comment in utimes(2) mentions, but it's not implemented yet. > > "Ideally a new system call will be added that allows the setting of all > three times at once." > btw, there's a paper someone can find something interesting at. http://www.usenix.org/events/bsdcon03/tech/full_papers/mckusick/mckusick_ht= ml/ --=20 wbr, pluknet