Date: Wed, 18 Apr 2012 11:57:47 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: freebsd-hackers@FreeBSD.org, freebsd-fs@FreeBSD.org Subject: Re: [review request] zfsboot/zfsloader: support accessing filesystems within a pool Message-ID: <4F8E820B.6080400@FreeBSD.org> In-Reply-To: <4F8999D2.1080902@FreeBSD.org> References: <4F8999D2.1080902@FreeBSD.org>
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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
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