136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/* $NetBSD: disklabel_swap.c,v 1.1 2021/05/17 08:50:36 mrg Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: disklabel_swap.c,v 1.1 2021/05/17 08:50:36 mrg Exp $");
|
|
|
|
#ifdef _KERNEL_OPT
|
|
#include "opt_disklabel.h"
|
|
#endif /* _KERNEL_OPT */
|
|
|
|
#if defined(DISKLABEL_EI) || defined(LIBSA_DISKLABEL_EI)
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/conf.h>
|
|
#include <lib/libkern/libkern.h>
|
|
|
|
/*
|
|
* from sh3/disksubr.c and kern/subr_disk_mbr.c with modifications:
|
|
* - update d_checksum properly
|
|
* - replace memcpy(9) by memmove(9) as a precaution
|
|
* - avoid memmove(9) for libkern version, check if the labels
|
|
* are the same and skip copying in-place.
|
|
*/
|
|
void
|
|
disklabel_swap(struct disklabel *nlp, struct disklabel *olp)
|
|
{
|
|
int i;
|
|
uint16_t npartitions;
|
|
|
|
#define SWAP16(x) nlp->x = bswap16(olp->x)
|
|
#define SWAP32(x) nlp->x = bswap32(olp->x)
|
|
|
|
SWAP32(d_magic);
|
|
SWAP16(d_type);
|
|
SWAP16(d_subtype);
|
|
if (nlp != olp) {
|
|
/* Do not need to swap char strings. */
|
|
memcpy(nlp->d_typename, olp->d_typename,
|
|
sizeof(nlp->d_typename));
|
|
|
|
/*
|
|
* XXX What should we do for d_un (an union of char and
|
|
* pointers)?
|
|
*/
|
|
memcpy(nlp->d_packname, olp->d_packname,
|
|
sizeof(nlp->d_packname));
|
|
}
|
|
|
|
SWAP32(d_secsize);
|
|
SWAP32(d_nsectors);
|
|
SWAP32(d_ntracks);
|
|
SWAP32(d_ncylinders);
|
|
SWAP32(d_secpercyl);
|
|
SWAP32(d_secperunit);
|
|
|
|
SWAP16(d_sparespertrack);
|
|
SWAP16(d_sparespercyl);
|
|
|
|
SWAP32(d_acylinders);
|
|
|
|
SWAP16(d_rpm);
|
|
SWAP16(d_interleave);
|
|
SWAP16(d_trackskew);
|
|
SWAP16(d_cylskew);
|
|
SWAP32(d_headswitch);
|
|
SWAP32(d_trkseek);
|
|
SWAP32(d_flags);
|
|
for (i = 0; i < NDDATA; i++)
|
|
SWAP32(d_drivedata[i]);
|
|
for (i = 0; i < NSPARE; i++)
|
|
SWAP32(d_spare[i]);
|
|
SWAP32(d_magic2);
|
|
/* d_checksum is updated later. */
|
|
|
|
SWAP16(d_npartitions);
|
|
SWAP32(d_bbsize);
|
|
SWAP32(d_sbsize);
|
|
for (i = 0; i < MAXPARTITIONS; i++) {
|
|
SWAP32(d_partitions[i].p_size);
|
|
SWAP32(d_partitions[i].p_offset);
|
|
SWAP32(d_partitions[i].p_fsize);
|
|
/* p_fstype and p_frag is uint8_t, so no need to swap. */
|
|
nlp->d_partitions[i].p_fstype = olp->d_partitions[i].p_fstype;
|
|
nlp->d_partitions[i].p_frag = olp->d_partitions[i].p_frag;
|
|
SWAP16(d_partitions[i].p_cpg);
|
|
}
|
|
|
|
#undef SWAP16
|
|
#undef SWAP32
|
|
|
|
/* Update checksum in the target endian. */
|
|
nlp->d_checksum = 0;
|
|
npartitions = nlp->d_magic == DISKMAGIC ?
|
|
nlp->d_npartitions : olp->d_npartitions;
|
|
/*
|
|
* npartitions can be larger than MAXPARTITIONS when the label was not
|
|
* validated by setdisklabel. If so, the label is intentionally(?)
|
|
* corrupted and checksum should be meaningless.
|
|
*/
|
|
if (npartitions <= MAXPARTITIONS)
|
|
nlp->d_checksum = dkcksum_sized(nlp, npartitions);
|
|
}
|
|
#endif /* DISKLABEL_EI || LIBSA_DISKLABEL_EI */
|