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OpenZFS uses feature flags instead of a zpool version number to track features since the split from Oracle. In addition to avoiding confusion on ZFS vs OpenZFS version numbers, this also allows features to be added to different operating systems that use OpenZFS in different order. The previous zfs boot code (gptzfsboot) and loader (zfsloader) blindly tries to read the pool, and if failed provided only a vague error message. With this change, both the boot code and loader check the MOS features list in the ZFS label and compare it against the list of features that the loader supports. If any unsupported feature is active, the pool is not considered as a candidate for booting, and a helpful diagnostic message is printed to the screen. Features that are merely enabled via zpool upgrade, but not in use, do not block booting from the pool. Submitted by: Toomas Soome <tsoome@me.com> Reviewed by: delphij, mav Relnotes: yes Differential Revision: https://reviews.freebsd.org/D6857
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/*-
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* Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _BOOT_LIBZFS_H_
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#define _BOOT_LIBZFS_H_
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#define ZFS_MAXNAMELEN 256
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/*
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* ZFS fully-qualified device descriptor.
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* Note, this must match the 'struct devdesc' declaration in bootstrap.h.
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* Arch-specific device descriptors should be binary compatible with this
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* structure if they are to support ZFS.
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*/
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struct zfs_devdesc
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{
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struct devsw *d_dev;
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int d_type;
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int d_unit;
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void *d_opendata;
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uint64_t pool_guid;
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uint64_t root_guid;
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};
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struct zfs_boot_args
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{
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uint32_t size;
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uint32_t reserved;
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uint64_t pool;
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uint64_t root;
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uint64_t primary_pool;
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uint64_t primary_vdev;
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char gelipw[256];
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};
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int zfs_parsedev(struct zfs_devdesc *dev, const char *devspec,
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const char **path);
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char *zfs_fmtdev(void *vdev);
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int zfs_probe_dev(const char *devname, uint64_t *pool_guid);
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int zfs_list(const char *name);
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void init_zfs_bootenv(char *currdev);
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int zfs_bootenv(const char *name);
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int zfs_belist_add(const char *name, uint64_t __unused);
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int zfs_set_env(void);
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extern struct devsw zfs_dev;
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extern struct fs_ops zfs_fsops;
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#endif /*_BOOT_LIBZFS_H_*/
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