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In zfs loader zfs device name format now is "zfs:pool/fs", fully qualified file path is "zfs:pool/fs:/path/to/file" loader allows accessing files from various pools and filesystems as well as changing currdev to a different pool/filesystem. zfsboot accepts kernel/loader name in a format pool:fs:path/to/file or, as before, pool:path/to/file; in the latter case a default filesystem is used (pool root or bootfs). zfsboot passes guids of the selected pool and dataset to zfsloader to be used as its defaults. zfs support should be architecture independent and is provided in a separate library, but architectures wishing to use this zfs support still have to provide some glue code and their devdesc should be compatible with zfs_devdesc. arch_zfs_probe method is used to discover all disk devices that may be part of ZFS pool(s). libi386 unconditionally includes zfs support, but some zfs-specific functions are stubbed out as weak symbols. The strong definitions are provided in libzfsboot. This change mean that the size of i386_devspec becomes larger to match zfs_devspec. Backward-compatibility shims are provided for recently added sparc64 zfs boot support. Currently that architecture still works the old way and does not support the new features. TODO: - clear up pool root filesystem vs pool bootfs filesystem distinction - update sparc64 support - set vfs.root.mountfrom based on currdev (for zfs) Mid-future TODO: - loader sub-menu for selecting alternative boot environment Distant future TODO: - support accessing snapshots, using a snapshot as readonly root Reviewed by: marius (sparc64), Gavin Mu <gavin.mu@gmail.com> (sparc64) Tested by: Florian Wagner <florian@wagner-flo.net> (x86), marius (sparc64) No objections: fs@, hackers@ MFC after: 1 month
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``world'' target should only be used in cases where the source tree has not changed from the currently running version. See: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html