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  * Copyright (c) 2003 Jake Burkholder
    3  * Copyright (c) 2003 Poul-Henning Kamp
    4  * Copyright (c) 2004,2005 Joerg Wunsch
    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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 /* Functions to encode or decode struct sun_disklabel into a bytestream
   29  * of correct endianess and packing.
   30  *
   31  * NB!  This file must be usable both in kernel and userland.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/8.3/sys/geom/geom_sunlabel_enc.c 199583 2009-11-20 15:27:52Z jhb $");
   36 
   37 #include <sys/types.h>
   38 #include <sys/endian.h>
   39 #include <sys/errno.h>
   40 #include <sys/sun_disklabel.h>
   41 #ifdef _KERNEL
   42 #include <sys/systm.h>
   43 #else
   44 #include <string.h>
   45 #endif
   46 
   47 #define SL_TEXT         0x0
   48 #define SL_TEXT_SIZEOF  0x80
   49 #define SL_VTOC_VERS    0x80
   50 #define SL_VTOC_VOLNAME 0x84
   51 #define SL_VTOC_NPART   0x8c
   52 #define SL_VTOC_MAP     0x8e
   53 #define SL_VTOC_SANITY  0xbc
   54 #define SL_RPM          0x1a4
   55 #define SL_PCYLINDERS   0x1a6
   56 #define SL_SPARESPERCYL 0x1a8
   57 #define SL_INTERLEAVE   0x1ae
   58 #define SL_NCYLINDERS   0x1b0
   59 #define SL_ACYLINDERS   0x1b2
   60 #define SL_NTRACKS      0x1b4
   61 #define SL_NSECTORS     0x1b6
   62 #define SL_PART         0x1bc
   63 #define SL_MAGIC        0x1fc
   64 #define SL_CKSUM        0x1fe
   65 
   66 #define SDKP_CYLOFFSET  0
   67 #define SDKP_NSECTORS   0x4
   68 #define SDKP_SIZEOF     0x8     /* size of a partition entry */
   69 
   70 #define SVTOC_TAG       0
   71 #define SVTOC_FLAG      0x2
   72 #define SVTOC_SIZEOF    0x4     /* size of a VTOC tag/flag entry */
   73 
   74 /*
   75  * Decode the relevant fields of a sun disk label, and return zero if the
   76  * magic and checksum works out OK.
   77  */
   78 int
   79 sunlabel_dec(void const *pp, struct sun_disklabel *sl)
   80 {
   81         const uint8_t *p;
   82         size_t i;
   83         u_int u;
   84         uint32_t vtocsane;
   85         uint16_t npart;
   86 
   87         p = pp;
   88         for (i = 0; i < sizeof(sl->sl_text); i++)
   89                 sl->sl_text[i] = p[SL_TEXT + i];
   90         sl->sl_rpm = be16dec(p + SL_RPM);
   91         sl->sl_pcylinders = be16dec(p + SL_PCYLINDERS);
   92         sl->sl_sparespercyl = be16dec(p + SL_SPARESPERCYL);
   93         sl->sl_interleave = be16dec(p + SL_INTERLEAVE);
   94         sl->sl_ncylinders = be16dec(p + SL_NCYLINDERS);
   95         sl->sl_acylinders = be16dec(p + SL_ACYLINDERS);
   96         sl->sl_ntracks = be16dec(p + SL_NTRACKS);
   97         sl->sl_nsectors = be16dec(p + SL_NSECTORS);
   98         for (i = 0; i < SUN_NPART; i++) {
   99                 sl->sl_part[i].sdkp_cyloffset = be32dec(p + SL_PART +
  100                     (i * SDKP_SIZEOF) + SDKP_CYLOFFSET);
  101                 sl->sl_part[i].sdkp_nsectors = be32dec(p + SL_PART +
  102                     (i * SDKP_SIZEOF) + SDKP_NSECTORS);
  103         }
  104         sl->sl_magic = be16dec(p + SL_MAGIC);
  105         vtocsane = be32dec(p + SL_VTOC_SANITY);
  106         npart = be16dec(p + SL_VTOC_NPART);
  107         if (vtocsane == SUN_VTOC_SANE && npart == SUN_NPART) {
  108                 /*
  109                  * Seems we've got SVR4-compatible VTOC information
  110                  * as well, decode it.
  111                  */
  112                 sl->sl_vtoc_sane = vtocsane;
  113                 sl->sl_vtoc_vers = be32dec(p + SL_VTOC_VERS);
  114                 memcpy(sl->sl_vtoc_volname, p + SL_VTOC_VOLNAME,
  115                     SUN_VOLNAME_LEN);
  116                 sl->sl_vtoc_nparts = SUN_NPART;
  117                 for (i = 0; i < SUN_NPART; i++) {
  118                         sl->sl_vtoc_map[i].svtoc_tag = be16dec(p +
  119                                 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_TAG);
  120                         sl->sl_vtoc_map[i].svtoc_flag = be16dec(p +
  121                                 SL_VTOC_MAP + (i * SVTOC_SIZEOF) + SVTOC_FLAG);
  122                 }
  123         }
  124         for (i = u = 0; i < SUN_SIZE; i += 2)
  125                 u ^= be16dec(p + i);
  126         if (u == 0 && sl->sl_magic == SUN_DKMAGIC)
  127                 return (0);
  128         else
  129                 return (EINVAL);
  130 }
  131 
  132 /*
  133  * Encode the relevant fields into a sun disklabel, compute new checksum.
  134  */
  135 void
  136 sunlabel_enc(void *pp, struct sun_disklabel *sl)
  137 {
  138         uint8_t *p;
  139         size_t i;
  140         u_int u;
  141 
  142         p = pp;
  143         for (i = 0; i < SL_TEXT_SIZEOF; i++)
  144                 p[SL_TEXT + i] = sl->sl_text[i];
  145         be16enc(p + SL_RPM, sl->sl_rpm);
  146         be16enc(p + SL_PCYLINDERS, sl->sl_pcylinders);
  147         be16enc(p + SL_SPARESPERCYL, sl->sl_sparespercyl);
  148         be16enc(p + SL_INTERLEAVE, sl->sl_interleave);
  149         be16enc(p + SL_NCYLINDERS, sl->sl_ncylinders);
  150         be16enc(p + SL_ACYLINDERS, sl->sl_acylinders);
  151         be16enc(p + SL_NTRACKS, sl->sl_ntracks);
  152         be16enc(p + SL_NSECTORS, sl->sl_nsectors);
  153         for (i = 0; i < SUN_NPART; i++) {
  154                 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_CYLOFFSET,
  155                     sl->sl_part[i].sdkp_cyloffset);
  156                 be32enc(p + SL_PART + (i * SDKP_SIZEOF) + SDKP_NSECTORS,
  157                     sl->sl_part[i].sdkp_nsectors);
  158         }
  159         be16enc(p + SL_MAGIC, sl->sl_magic);
  160         if (sl->sl_vtoc_sane == SUN_VTOC_SANE
  161             && sl->sl_vtoc_nparts == SUN_NPART) {
  162                 /*
  163                  * Write SVR4-compatible VTOC elements.
  164                  */
  165                 be32enc(p + SL_VTOC_VERS, sl->sl_vtoc_vers);
  166                 be32enc(p + SL_VTOC_SANITY, SUN_VTOC_SANE);
  167                 memcpy(p + SL_VTOC_VOLNAME, sl->sl_vtoc_volname,
  168                     SUN_VOLNAME_LEN);
  169                 be16enc(p + SL_VTOC_NPART, SUN_NPART);
  170                 for (i = 0; i < SUN_NPART; i++) {
  171                         be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
  172                                 + SVTOC_TAG,
  173                                 sl->sl_vtoc_map[i].svtoc_tag);
  174                         be16enc(p + SL_VTOC_MAP + (i * SVTOC_SIZEOF)
  175                                 + SVTOC_FLAG,
  176                                 sl->sl_vtoc_map[i].svtoc_flag);
  177                 }
  178         }
  179         for (i = u = 0; i < SUN_SIZE; i += 2)
  180                 u ^= be16dec(p + i);
  181         be16enc(p + SL_CKSUM, u);
  182 }

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