112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* $NetBSD: subr_disklabel.c,v 1.3 2019/04/07 02:58:02 rin Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_disklabel.c,v 1.3 2019/04/07 02:58:02 rin Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/disklabel.h>
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#if !defined(__HAVE_SETDISKLABEL) || defined(_RUMPKERNEL)
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#ifdef DEBUG
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#define DPRINTF(a, ...) printf(a, ##__VA_ARGS__)
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#else
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#define DPRINTF(a, ...) __nothing
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#endif
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/*
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* Check new disk label for sensibility
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* before setting it.
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*/
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int
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setdisklabel(struct disklabel *olp, struct disklabel *nlp, u_long openmask,
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struct cpu_disklabel *osdep)
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{
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int i;
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struct partition *opp, *npp;
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/* sanity clause */
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if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0
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|| (nlp->d_secsize % DEV_BSIZE) != 0) {
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DPRINTF("%s: secpercyl/secsize %u/%u\n", __func__,
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nlp->d_secpercyl, nlp->d_secsize);
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return EINVAL;
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}
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/* special case to allow disklabel to be invalidated */
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if (nlp->d_magic == 0xffffffff) {
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*olp = *nlp;
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return 0;
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}
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if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
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nlp->d_npartitions > MAXPARTITIONS || dkcksum(nlp) != 0) {
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DPRINTF("%s: bad magic %#x/%#x != %#x, partitions %u != %u"
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", bad sum=%#x\n", __func__,
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nlp->d_magic, nlp->d_magic2, DISKMAGIC,
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nlp->d_npartitions, MAXPARTITIONS, dkcksum(nlp));
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return EINVAL;
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}
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while (openmask != 0) {
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i = ffs(openmask) - 1;
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openmask &= ~(1 << i);
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if (i >= nlp->d_npartitions) {
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DPRINTF("%s: partition not found\n", __func__);
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return EBUSY;
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}
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opp = &olp->d_partitions[i];
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npp = &nlp->d_partitions[i];
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/*
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* Copy internally-set partition information
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* if new label doesn't include it. XXX
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*/
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if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
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*npp = *opp;
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continue;
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}
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if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
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{
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DPRINTF("%s: mismatched offset/size", __func__);
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return EBUSY;
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}
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}
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nlp->d_checksum = 0;
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nlp->d_checksum = dkcksum(nlp);
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*olp = *nlp;
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return 0;
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}
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#endif
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