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_bsd_enc.c

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    1 /*-
    2  * Copyright (c) 2002 Poul-Henning Kamp
    3  * Copyright (c) 2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
    8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
    9  * DARPA CHATS research program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The names of the authors may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  */
   35 
   36 /*
   37  * Functions to encode and decode struct disklabel and struct partition into
   38  * a bytestream of little endianess and correct packing.
   39  *
   40  * NB!  This file must be usable both in kernel and userland.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/8.3/sys/geom/geom_bsd_enc.c 199583 2009-11-20 15:27:52Z jhb $");
   45 
   46 #include <sys/types.h>
   47 #include <sys/endian.h>
   48 #include <sys/disklabel.h>
   49 #include <sys/errno.h>
   50 #ifdef _KERNEL
   51 #include <sys/systm.h>
   52 #else
   53 #include <string.h>
   54 #endif
   55 
   56 void
   57 bsd_partition_le_dec(u_char *ptr, struct partition *d)
   58 {
   59         d->p_size = le32dec(ptr + 0);
   60         d->p_offset = le32dec(ptr + 4);
   61         d->p_fsize = le32dec(ptr + 8);
   62         d->p_fstype = ptr[12];
   63         d->p_frag = ptr[13];
   64         d->p_cpg = le16dec(ptr + 14);
   65 }
   66 
   67 int
   68 bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart)
   69 {
   70         int i;
   71         u_char *p, *pe;
   72         uint16_t sum;
   73 
   74         d->d_magic = le32dec(ptr + 0);
   75         if (d->d_magic != DISKMAGIC)
   76                 return(EINVAL);
   77 
   78         d->d_magic2 = le32dec(ptr + 132);
   79         if (d->d_magic2 != DISKMAGIC) {
   80                 return(EINVAL);
   81         }
   82 
   83         d->d_npartitions = le16dec(ptr + 138);
   84         if (d->d_npartitions > maxpart) {
   85                 return(EINVAL);
   86         }
   87 
   88         pe = ptr + 148 + 16 * d->d_npartitions;
   89         sum = 0;
   90         for (p = ptr; p < pe; p += 2)
   91                 sum ^= le16dec(p);
   92         if (sum != 0) {
   93                 return(EINVAL);
   94         }
   95 
   96         d->d_type = le16dec(ptr + 4);
   97         d->d_subtype = le16dec(ptr + 6);
   98         bcopy(ptr + 8, d->d_typename, 16);
   99         bcopy(ptr + 24, d->d_packname, 16);
  100         d->d_secsize = le32dec(ptr + 40);
  101         d->d_nsectors = le32dec(ptr + 44);
  102         d->d_ntracks = le32dec(ptr + 48);
  103         d->d_ncylinders = le32dec(ptr + 52);
  104         d->d_secpercyl = le32dec(ptr + 56);
  105         d->d_secperunit = le32dec(ptr + 60);
  106         d->d_sparespertrack = le16dec(ptr + 64);
  107         d->d_sparespercyl = le16dec(ptr + 66);
  108         d->d_acylinders = le32dec(ptr + 68);
  109         d->d_rpm = le16dec(ptr + 72);
  110         d->d_interleave = le16dec(ptr + 74);
  111         d->d_trackskew = le16dec(ptr + 76);
  112         d->d_cylskew = le16dec(ptr + 78);
  113         d->d_headswitch = le32dec(ptr + 80);
  114         d->d_trkseek = le32dec(ptr + 84);
  115         d->d_flags = le32dec(ptr + 88);
  116         d->d_drivedata[0] = le32dec(ptr + 92);
  117         d->d_drivedata[1] = le32dec(ptr + 96);
  118         d->d_drivedata[2] = le32dec(ptr + 100);
  119         d->d_drivedata[3] = le32dec(ptr + 104);
  120         d->d_drivedata[4] = le32dec(ptr + 108);
  121         d->d_spare[0] = le32dec(ptr + 112);
  122         d->d_spare[1] = le32dec(ptr + 116);
  123         d->d_spare[2] = le32dec(ptr + 120);
  124         d->d_spare[3] = le32dec(ptr + 124);
  125         d->d_spare[4] = le32dec(ptr + 128);
  126         d->d_checksum = le16dec(ptr + 136);
  127         d->d_npartitions = le16dec(ptr + 138);
  128         d->d_bbsize = le32dec(ptr + 140);
  129         d->d_sbsize = le32dec(ptr + 144);
  130         for (i = 0; i < d->d_npartitions; i++)
  131                 bsd_partition_le_dec(ptr + 148 + 16 * i, &d->d_partitions[i]);
  132         return(0);
  133 }
  134 
  135 void
  136 bsd_partition_le_enc(u_char *ptr, struct partition *d)
  137 {
  138         le32enc(ptr + 0, d->p_size);
  139         le32enc(ptr + 4, d->p_offset);
  140         le32enc(ptr + 8, d->p_fsize);
  141         ptr[12] = d->p_fstype;
  142         ptr[13] = d->p_frag;
  143         le16enc(ptr + 14, d->p_cpg);
  144 }
  145 
  146 void
  147 bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d)
  148 {
  149         int i;
  150         u_char *p, *pe;
  151         uint16_t sum;
  152 
  153         le32enc(ptr + 0, d->d_magic);
  154         le16enc(ptr + 4, d->d_type);
  155         le16enc(ptr + 6, d->d_subtype);
  156         bcopy(d->d_typename, ptr + 8, 16);
  157         bcopy(d->d_packname, ptr + 24, 16);
  158         le32enc(ptr + 40, d->d_secsize);
  159         le32enc(ptr + 44, d->d_nsectors);
  160         le32enc(ptr + 48, d->d_ntracks);
  161         le32enc(ptr + 52, d->d_ncylinders);
  162         le32enc(ptr + 56, d->d_secpercyl);
  163         le32enc(ptr + 60, d->d_secperunit);
  164         le16enc(ptr + 64, d->d_sparespertrack);
  165         le16enc(ptr + 66, d->d_sparespercyl);
  166         le32enc(ptr + 68, d->d_acylinders);
  167         le16enc(ptr + 72, d->d_rpm);
  168         le16enc(ptr + 74, d->d_interleave);
  169         le16enc(ptr + 76, d->d_trackskew);
  170         le16enc(ptr + 78, d->d_cylskew);
  171         le32enc(ptr + 80, d->d_headswitch);
  172         le32enc(ptr + 84, d->d_trkseek);
  173         le32enc(ptr + 88, d->d_flags);
  174         le32enc(ptr + 92, d->d_drivedata[0]);
  175         le32enc(ptr + 96, d->d_drivedata[1]);
  176         le32enc(ptr + 100, d->d_drivedata[2]);
  177         le32enc(ptr + 104, d->d_drivedata[3]);
  178         le32enc(ptr + 108, d->d_drivedata[4]);
  179         le32enc(ptr + 112, d->d_spare[0]);
  180         le32enc(ptr + 116, d->d_spare[1]);
  181         le32enc(ptr + 120, d->d_spare[2]);
  182         le32enc(ptr + 124, d->d_spare[3]);
  183         le32enc(ptr + 128, d->d_spare[4]);
  184         le32enc(ptr + 132, d->d_magic2);
  185         le16enc(ptr + 136, 0);
  186         le16enc(ptr + 138, d->d_npartitions);
  187         le32enc(ptr + 140, d->d_bbsize);
  188         le32enc(ptr + 144, d->d_sbsize);
  189         for (i = 0; i < d->d_npartitions; i++)
  190                 bsd_partition_le_enc(ptr + 148 + 16 * i, &d->d_partitions[i]);
  191         pe = ptr + 148 + 16 * d->d_npartitions;
  192         sum = 0;
  193         for (p = ptr; p < pe; p += 2)
  194                 sum ^= le16dec(p);
  195         le16enc(ptr + 136, sum);
  196 }

Cache object: 60d145ee5a3b727b76297363d2564c97


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