The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_disklabel.c

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    1 /*      $NetBSD: subr_disklabel.c,v 1.3 2019/04/07 02:58:02 rin Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ufs_disksubr.c      7.16 (Berkeley) 5/4/91
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: subr_disklabel.c,v 1.3 2019/04/07 02:58:02 rin Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/disklabel.h>
   40 
   41 #if !defined(__HAVE_SETDISKLABEL) || defined(_RUMPKERNEL)
   42 
   43 #ifdef DEBUG
   44 #define DPRINTF(a, ...) printf(a, ##__VA_ARGS__)
   45 #else
   46 #define DPRINTF(a, ...) __nothing
   47 #endif
   48 
   49 /*
   50  * Check new disk label for sensibility
   51  * before setting it.
   52  */
   53 int
   54 setdisklabel(struct disklabel *olp, struct disklabel *nlp, u_long openmask,
   55     struct cpu_disklabel *osdep)
   56 {
   57         int i;
   58         struct partition *opp, *npp;
   59 
   60         /* sanity clause */
   61         if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0
   62                 || (nlp->d_secsize % DEV_BSIZE) != 0) {
   63                 DPRINTF("%s: secpercyl/secsize %u/%u\n", __func__,
   64                     nlp->d_secpercyl, nlp->d_secsize);
   65                 return EINVAL;
   66         }
   67 
   68         /* special case to allow disklabel to be invalidated */
   69         if (nlp->d_magic == 0xffffffff) {
   70                 *olp = *nlp;
   71                 return 0;
   72         }
   73 
   74         if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
   75             nlp->d_npartitions > MAXPARTITIONS || dkcksum(nlp) != 0) {
   76                 DPRINTF("%s: bad magic %#x/%#x != %#x, partitions %u != %u"
   77                     ", bad sum=%#x\n", __func__,
   78                     nlp->d_magic, nlp->d_magic2, DISKMAGIC,
   79                     nlp->d_npartitions, MAXPARTITIONS, dkcksum(nlp));
   80                 return EINVAL;
   81         }
   82 
   83         while (openmask != 0) {
   84                 i = ffs(openmask) - 1;
   85                 openmask &= ~(1 << i);
   86                 if (i >= nlp->d_npartitions) {
   87                         DPRINTF("%s: partition not found\n", __func__);
   88                         return EBUSY;
   89                 }
   90                 opp = &olp->d_partitions[i];
   91                 npp = &nlp->d_partitions[i];
   92                 /*
   93                  * Copy internally-set partition information
   94                  * if new label doesn't include it.             XXX
   95                  */
   96                 if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
   97                         *npp = *opp;
   98                         continue;
   99                 }
  100                 if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
  101                 {
  102                         DPRINTF("%s: mismatched offset/size", __func__);
  103                         return EBUSY;
  104                 }
  105         }
  106         nlp->d_checksum = 0;
  107         nlp->d_checksum = dkcksum(nlp);
  108         *olp = *nlp;
  109         return 0;
  110 }
  111 #endif

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