From owner-freebsd-hackers@FreeBSD.ORG Wed Apr 18 08:57:51 2012 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 DDE73106566C; Wed, 18 Apr 2012 08:57:51 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 042928FC14; Wed, 18 Apr 2012 08:57:50 +0000 (UTC) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id LAA08986; Wed, 18 Apr 2012 11:57:49 +0300 (EEST) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1SKQhx-000Lz9-82; Wed, 18 Apr 2012 11:57:49 +0300 Message-ID: <4F8E820B.6080400@FreeBSD.org> Date: Wed, 18 Apr 2012 11:57:47 +0300 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.3) Gecko/20120317 Thunderbird/10.0.3 MIME-Version: 1.0 To: freebsd-hackers@FreeBSD.org, freebsd-fs@FreeBSD.org References: <4F8999D2.1080902@FreeBSD.org> In-Reply-To: <4F8999D2.1080902@FreeBSD.org> X-Enigmail-Version: 1.4 Content-Type: text/plain; charset=x-viet-vps Content-Transfer-Encoding: 7bit Cc: Subject: Re: [review request] zfsboot/zfsloader: support accessing filesystems within a pool 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, 18 Apr 2012 08:57:52 -0000 on 14/04/2012 18:37 Andriy Gapon said the following: > > I would like to ask for a review and/or testing of the following three patches: > http://people.freebsd.org/~avg/zfsboot.patches.diff I've put a new version of the patch here: http://people.freebsd.org/~avg/zfsboot.patches.2.diff Most prominent changes: - new zfsloader should be compatible with previous zfsboot - libi386 unconditionally includes zfs support via use of weak symbols for some functions Unfortunately, unconditional compatibility between i386_devdesc and zfs_devdesc means that i386_devdesc becomes much larger (> 512 bytes). But I think that it shouldn't cause any real problems. > These patches add support for booting from an arbitrary filesystem of any > detected ZFS pool. A filesystem could be selected in zfsboot and thus will > affectfrom where zfsloader would be loaded. zfsboot passes information about > the boot pool and filesystem to zfsloader, which uses those for loaddev and > default value of currdev. A different pool+filesystem could be selected in > zfsloader for booting kernel. Also if vfs.root.mountfrom is not explicitly set > and is not derived from fstab, then it gets set to the selected boot filesystem. > > This should could be used as a foundation for the support of Solaris-like boot > environment selection. I believe that other people have already developed > scripts utilizing ZFS capabilities to provide other aspects of management of > boot environments. > > I am particularly interested in reviews of my attempt to make ZFS boot support > arch-independent. The arches, of course, would have to add some code to make > use of that support. Currently I only enabled it for x86. > > Thank you very much! -- Andriy Gapon