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subr_disklabel.c revision 1.3.4.2 
      1 /*	$NetBSD: subr_disklabel.c,v 1.3.4.2 2019/06/10 22:09:03 christos 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 1.3.4.2 2019/06/10 22:09:03 christos 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
    112