97371ba2a9
(gpt)zfsboot will read one-time boot directives from a special ZFS pool area. The area was previously described as "Boot Block Header", but currently it is know as Pad2, marked as reserved and is zeroed out on pool creation. The new code interprets data in this area, if any, using the same format as boot.config. The area is immediately wiped out. Failure to parse the directives results in a reboot right after the cleanup. Otherwise the boot sequence proceeds as usual. zfsbootcfg writes zfsboot arguments specified on its command line to the Pad2 area of a disk identified by vfs.zfs.boot.primary_pool and vfs.zfs.boot.primary_vdev kenv variables that are set by loader during boot. Please see the manual page for more. Thanks to all who reviewed, contributed and made suggestions! There are many potential improvements to the feature, please see the review for details. Reviewed by: wblock (docs) Discussed with: jhb, tsoome MFC after: 3 weeks Relnotes: yes Differential Revision: https://reviews.freebsd.org/D7612
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/*-
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* Copyright (c) 2010 Pawel Jakub Dawidek <pjd@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 AUTHORS 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 AUTHORS 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 _DRV_H_
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#define _DRV_H_
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struct dsk {
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unsigned int drive;
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unsigned int type;
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unsigned int unit;
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unsigned int slice;
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int part;
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daddr_t start;
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int init;
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};
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int drvread(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk);
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#if defined(GPT) || defined(ZFS)
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int drvwrite(struct dsk *dskp, void *buf, daddr_t lba, unsigned nblk);
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#endif /* GPT || ZFS */
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uint64_t drvsize(struct dsk *dskp);
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#endif /* !_DRV_H_ */
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