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/sys/disklabel.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1987, 1988, 1993
    5  *      The Regents of the University of California.  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  *      @(#)disklabel.h 8.2 (Berkeley) 7/10/94
   32  * $FreeBSD: releng/12.0/sys/sys/disklabel.h 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 
   35 #ifndef _SYS_DISKLABEL_H_
   36 #define _SYS_DISKLABEL_H_
   37 
   38 #ifndef _KERNEL
   39 #include <sys/types.h>
   40 #endif
   41 #include <sys/ioccom.h>
   42 
   43 #include <sys/disk/bsd.h>
   44 
   45 /* Disk description table, see disktab(5) */
   46 #define _PATH_DISKTAB   "/etc/disktab"
   47 
   48 /*
   49  * The label is in block 0 or 1, possibly offset from the beginning
   50  * to leave room for a bootstrap, etc.
   51  * XXX these should be defined per controller (or drive) elsewhere, not here!
   52  * XXX in actuality it can't even be per controller or drive. It should be
   53  * constant/fixed across storage hardware and CPU architectures. Disks can
   54  * travel from one machine to another and a label created on one machine
   55  * should be detectable and understood by the other.
   56  */
   57 #define LABELSECTOR     1                       /* sector containing label */
   58 #define LABELOFFSET     0                       /* offset of label in sector */
   59 
   60 #define DISKMAGIC       BSD_MAGIC               /* The disk magic number */
   61 
   62 #ifndef MAXPARTITIONS
   63 #define MAXPARTITIONS   BSD_NPARTS_MIN
   64 #endif
   65 
   66 /* Size of bootblock area in sector-size neutral bytes */
   67 #define BBSIZE          BSD_BOOTBLOCK_SIZE
   68 
   69 #define LABEL_PART      BSD_PART_RAW
   70 #define RAW_PART        BSD_PART_RAW
   71 #define SWAP_PART       BSD_PART_SWAP
   72 
   73 #define NDDATA          BSD_NDRIVEDATA
   74 #define NSPARE          BSD_NSPARE
   75 
   76 static __inline u_int16_t dkcksum(struct disklabel *lp);
   77 static __inline u_int16_t
   78 dkcksum(struct disklabel *lp)
   79 {
   80         u_int16_t *start, *end;
   81         u_int16_t sum = 0;
   82 
   83         start = (u_int16_t *)lp;
   84         end = (u_int16_t *)&lp->d_partitions[lp->d_npartitions];
   85         while (start < end)
   86                 sum ^= *start++;
   87         return (sum);
   88 }
   89 
   90 #ifdef DKTYPENAMES
   91 static const char *dktypenames[] = {
   92         "unknown",
   93         "SMD",
   94         "MSCP",
   95         "old DEC",
   96         "SCSI",
   97         "ESDI",
   98         "ST506",
   99         "HP-IB",
  100         "HP-FL",
  101         "type 9",
  102         "floppy",
  103         "CCD",
  104         "Vinum",
  105         "DOC2K",
  106         "Raid",
  107         "?",
  108         "jfs",
  109         NULL
  110 };
  111 #define DKMAXTYPES      (sizeof(dktypenames) / sizeof(dktypenames[0]) - 1)
  112 #endif
  113 
  114 #ifdef  FSTYPENAMES
  115 static const char *fstypenames[] = {
  116         "unused",
  117         "swap",
  118         "Version 6",
  119         "Version 7",
  120         "System V",
  121         "4.1BSD",
  122         "Eighth Edition",
  123         "4.2BSD",
  124         "MSDOS",
  125         "4.4LFS",
  126         "unknown",
  127         "HPFS",
  128         "ISO9660",
  129         "boot",
  130         "vinum",
  131         "raid",
  132         "Filecore",
  133         "EXT2FS",
  134         "NTFS",
  135         "?",
  136         "ccd",
  137         "jfs",
  138         "HAMMER",
  139         "HAMMER2",
  140         "UDF",
  141         "?",
  142         "EFS",
  143         "ZFS",
  144         "?",
  145         "?",
  146         "nandfs",
  147         NULL
  148 };
  149 #define FSMAXTYPES      (sizeof(fstypenames) / sizeof(fstypenames[0]) - 1)
  150 #endif
  151 
  152 /*
  153  * NB: <sys/disk.h> defines ioctls from 'd'/128 and up.
  154  */
  155 
  156 /*
  157  * Functions for proper encoding/decoding of struct disklabel into/from
  158  * bytestring.
  159  */
  160 void bsd_partition_le_dec(u_char *ptr, struct partition *d);
  161 int bsd_disklabel_le_dec(u_char *ptr, struct disklabel *d, int maxpart);
  162 void bsd_partition_le_enc(u_char *ptr, struct partition *d);
  163 void bsd_disklabel_le_enc(u_char *ptr, struct disklabel *d);
  164 
  165 #ifndef _KERNEL
  166 __BEGIN_DECLS
  167 struct disklabel *getdiskbyname(const char *);
  168 __END_DECLS
  169 #endif
  170 
  171 #endif /* !_SYS_DISKLABEL_H_ */

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