From owner-freebsd-current@FreeBSD.ORG Sun Nov 30 11:51:54 2008 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 508D41065672 for ; Sun, 30 Nov 2008 11:51:54 +0000 (UTC) (envelope-from luigi@onelab2.iet.unipi.it) Received: from onelab2.iet.unipi.it (onelab2.iet.unipi.it [131.114.9.129]) by mx1.freebsd.org (Postfix) with ESMTP id 128528FC16 for ; Sun, 30 Nov 2008 11:51:53 +0000 (UTC) (envelope-from luigi@onelab2.iet.unipi.it) Received: by onelab2.iet.unipi.it (Postfix, from userid 275) id C680D73098; Sun, 30 Nov 2008 12:56:39 +0100 (CET) Date: Sun, 30 Nov 2008 12:56:39 +0100 From: Luigi Rizzo To: Kostik Belousov Message-ID: <20081130115639.GA60027@onelab2.iet.unipi.it> References: <20081130043110.GA48062@onelab2.iet.unipi.it> <20081130105859.GF3045@deviant.kiev.zoral.com.ua> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081130105859.GF3045@deviant.kiev.zoral.com.ua> User-Agent: Mutt/1.4.2.3i Cc: current@freebsd.org Subject: Re: libufs limitation trying to make newfs work on plain files X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 30 Nov 2008 11:51:54 -0000 On Sun, Nov 30, 2008 at 12:58:59PM +0200, Kostik Belousov wrote: > On Sun, Nov 30, 2008 at 05:31:10AM +0100, Luigi Rizzo wrote: > > libufs limitation trying to make newfs work on plain files ... > You proposal would introduce incompatibility in the ABI exposed by > one of the system library. The solution adopted by Linux and (recently) > by FreeBSD, is to use ELF symbol versioning. It seems that this case > can be handled by symver. As additional benefit, after your work > we would got one more symver-ed system library. could you point me to an example in freebsd that shows how to use this feature ? thanks luigi