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/geom/geom_sunlabel_enc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003 Jake Burkholder
    5  * Copyright (c) 2003 Poul-Henning Kamp
    6  * Copyright (c) 2004,2005 Joerg Wunsch
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 /* Functions to encode or decode struct sun_disklabel into a bytestream
   31  * of correct endianness and packing.
   32  *
   33  * NB!  This file must be usable both in kernel and userland.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/12.0/sys/geom/geom_sunlabel_enc.c 326270 2017-11-27 15:17:37Z pfg $");
   38 
   39 #include <sys/types.h>
   40 #include <sys/endian.h>
   41 #include <sys/errno.h>
   42 #include <sys/sun_disklabel.h>
   43 #ifdef _KERNEL
   44 #include <sys/systm.h>
   45 #else
   46 #include <string.h>
   47 #endif
   48 
   49 #define SL_TEXT         0x0
   50 #define SL_TEXT_SIZEOF  0x80
   51 #define SL_VTOC_VERS    0x80
   52 #define SL_VTOC_VOLNAME 0x84
   53 #define SL_VTOC_NPART   0x8c
   54 #define SL_VTOC_MAP     0x8e
   55 #define SL_VTOC_SANITY  0xbc
   56 #define SL_RPM          0x1a4
   57 #define SL_PCYLINDERS   0x1a6
   58 #define SL_SPARESPERCYL 0x1a8
   59 #define SL_INTERLEAVE   0x1ae
   60 #define SL_NCYLINDERS   0x1b0
   61 #define SL_ACYLINDERS   0x1b2
   62 #define SL_NTRACKS      0x1b4
   63 #define SL_NSECTORS     0x1b6
   64 #define SL_PART         0x1bc
   65 #define SL_MAGIC        0x1fc
   66 #define SL_CKSUM        0x1fe
   67 
   68 #define SDKP_CYLOFFSET  0
   69 #define SDKP_NSECTORS   0x4
   70 #define SDKP_SIZEOF     0x8     /* size of a partition entry */
   71 
   72 #define SVTOC_TAG       0
   73 #define SVTOC_FLAG      0x2
   74 #define SVTOC_SIZEOF    0x4     /* size of a VTOC tag/flag entry */
   75 
   76 /*
   77  * Decode the relevant fields of a sun disk label, and return zero if the
   78  * magic and checksum works out OK.
   79  */
   80 int
   81 sunlabel_dec(void const *pp, struct sun_disklabel *sl)
   82 {
   83         const uint8_t *p;
   84         size_t i;
   85         u_int u;
   86         uint32_t vtocsane;
   87         uint16_t npart;
   88 
   89         p = pp;
   90         for (i = 0; i < sizeof(sl->sl_text); i++)
   91                 sl->sl_text[i] = p[SL_TEXT + i];
   92         sl->sl_rpm = be16dec(p + SL_RPM);
   93         sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
   94         sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
   95         sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
   96         sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
   97         sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
   98         sl->sl_ntracks = be16dec(p + SL_NTRACKS);
   99         sl->sl_nsectors = be16dec(p + SL_NSECTORS);
  100         for (i = 0; i < SUN_NPART; i++) {
  101                 sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
  102                     (i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
  103                 sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
  104                     (i * SDKP_SIZEOF) + SDKP_NSECTORS);
  105         }
  106         sl->sl_magic = be16dec(p + SL_MAGIC);
  107         vtocsane = be32dec(p + SL_VTOC_SANITY);
  108         npart = be16dec(p + SL_VTOC_NPART);
  109         if (vtocsane == SUN_VTOC_SANE && npart == SUN_NPART) {
  110                 /*
  111                  * Seems we've got SVR4-compatible VTOC information
  112                  * as well, decode it.
  113                  */
  114                 sl->sl_vtoc_sane = vtocsane;
  115                 sl->sl_vtoc_vers = be32dec(p + SL_VTOC_VERS);
  116                 memcpy(sl->sl_vtoc_volname, p + SL_VTOC_VOLNAME,
  117                     SUN_VOLNAME_LEN);
  118                 sl->sl_vtoc_nparts = SUN_NPART;
  119                 for (i = 0; i < SUN_NPART; i++) {
  120                         sl->sl_vtoc_map[i].svtoc_tag = be16dec(p +
  121                                 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_TAG);
  122                         sl->sl_vtoc_map[i].svtoc_flag = be16dec(p +
  123                                 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_FLAG);
  124                 }
  125         }
  126         for (i = u = 0; i < SUN_SIZE; i += 2)
  127                 u ^= be16dec(p + i);
  128         if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
  129                 return (0);
  130         else
  131                 return (EINVAL);
  132 }
  133 
  134 /*
  135  * Encode the relevant fields into a sun disklabel, compute new checksum.
  136  */
  137 void
  138 sunlabel_enc(void *pp, struct sun_disklabel *sl)
  139 {
  140         uint8_t *p;
  141         size_t i;
  142         u_int u;
  143 
  144         p = pp;
  145         for (i = 0; i < SL_TEXT_SIZEOF; i++)
  146                 p[SL_TEXT + i] = sl->sl_text[i];
  147         be16enc(p + SL_RPM, sl->sl_rpm);
  148         be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
  149         be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
  150         be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
  151         be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
  152         be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
  153         be16enc(p + SL_NTRACKS, sl->sl_ntracks);
  154         be16enc(p + SL_NSECTORS, sl->sl_nsectors);
  155         for (i = 0; i < SUN_NPART; i++) {
  156                 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
  157                     sl->sl_part[i].sdkp_cyloffset);
  158                 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
  159                     sl->sl_part[i].sdkp_nsectors);
  160         }
  161         be16enc(p + SL_MAGIC, sl->sl_magic);
  162         if (sl->sl_vtoc_sane == SUN_VTOC_SANE
  163             && sl->sl_vtoc_nparts == SUN_NPART) {
  164                 /*
  165                  * Write SVR4-compatible VTOC elements.
  166                  */
  167                 be32enc(p + SL_VTOC_VERS, sl->sl_vtoc_vers);
  168                 be32enc(p + SL_VTOC_SANITY, SUN_VTOC_SANE);
  169                 memcpy(p + SL_VTOC_VOLNAME, sl->sl_vtoc_volname,
  170                     SUN_VOLNAME_LEN);
  171                 be16enc(p + SL_VTOC_NPART, SUN_NPART);
  172                 for (i = 0; i < SUN_NPART; i++) {
  173                         be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
  174                                 + SVTOC_TAG,
  175                                 sl->sl_vtoc_map[i].svtoc_tag);
  176                         be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
  177                                 + SVTOC_FLAG,
  178                                 sl->sl_vtoc_map[i].svtoc_flag);
  179                 }
  180         }
  181         for (i = u = 0; i < SUN_SIZE; i += 2)
  182                 u ^= be16dec(p + i);
  183         be16enc(p + SL_CKSUM, u);
  184 }

Cache object: 36177cb3f892bbffd61f6f978351a0cf


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