extras/volume_id/lib/sysv.c

   1 /*
   2  * volume_id - reads filesystem label and uuid
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the
   8  *      Free Software Foundation version 2 of the License.
   9  */
  10
  11 #ifndef _GNU_SOURCE
  12 #define _GNU_SOURCE 1
  13 #endif
  14
  15 #ifdef HAVE_CONFIG_H
  16 #  include <config.h>
  17 #endif
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25
  26 #include "libvolume_id.h"
  27 #include "util.h"
  28
  29 #define SYSV_NICINOD                    100
  30 #define SYSV_NICFREE                    50
  31
  32 struct sysv_super
  33 {
  34         uint16_t        s_isize;
  35         uint16_t        s_pad0;
  36         uint32_t        s_fsize;
  37         uint16_t        s_nfree;
  38         uint16_t        s_pad1;
  39         uint32_t        s_free[SYSV_NICFREE];
  40         uint16_t        s_ninode;
  41         uint16_t        s_pad2;
  42         uint16_t        s_inode[SYSV_NICINOD];
  43         uint8_t         s_flock;
  44         uint8_t         s_ilock;
  45         uint8_t         s_fmod;
  46         uint8_t         s_ronly;
  47         uint32_t        s_time;
  48         uint16_t        s_dinfo[4];
  49         uint32_t        s_tfree;
  50         uint16_t        s_tinode;
  51         uint16_t        s_pad3;
  52         uint8_t         s_fname[6];
  53         uint8_t         s_fpack[6];
  54         uint32_t        s_fill[12];
  55         uint32_t        s_state;
  56         uint32_t        s_magic;
  57         uint32_t        s_type;
  58 } PACKED;
  59
  60 #define XENIX_NICINOD                           100
  61 #define XENIX_NICFREE                           100
  62
  63 struct xenix_super {
  64         uint16_t        s_isize;
  65         uint32_t        s_fsize;
  66         uint16_t        s_nfree;
  67         uint32_t        s_free[XENIX_NICFREE];
  68         uint16_t        s_ninode;
  69         uint16_t        s_inode[XENIX_NICINOD];
  70         uint8_t         s_flock;
  71         uint8_t         s_ilock;
  72         uint8_t         s_fmod;
  73         uint8_t         s_ronly;
  74         uint32_t        s_time;
  75         uint32_t        s_tfree;
  76         uint16_t        s_tinode;
  77         uint16_t        s_dinfo[4];
  78         uint8_t         s_fname[6];
  79         uint8_t         s_fpack[6];
  80         uint8_t         s_clean;
  81         uint8_t         s_fill[371];
  82         uint32_t        s_magic;
  83         uint32_t        s_type;
  84 } PACKED;
  85
  86 #define SYSV_SUPERBLOCK_BLOCK                   0x01
  87 #define SYSV_MAGIC                              0xfd187e20
  88 #define XENIX_SUPERBLOCK_BLOCK                  0x18
  89 #define XENIX_MAGIC                             0x2b5544
  90 #define SYSV_MAX_BLOCKSIZE                      0x800
  91
  92 int volume_id_probe_sysv(struct volume_id *id, uint64_t off, uint64_t size)
  93 {
  94         struct sysv_super *vs;
  95         struct xenix_super *xs;
  96         unsigned int boff;
  97
  98         info("probing at offset 0x%llx", (unsigned long long) off);
  99
 100         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 101                 vs = (struct sysv_super *)
 102                         volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
 103                 if (vs == NULL)
 104                         return -1;
 105
 106                 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
 107                         volume_id_set_label_raw(id, vs->s_fname, 6);
 108                         volume_id_set_label_string(id, vs->s_fname, 6);
 109                         id->type = "sysv";
 110                         goto found;
 111                 }
 112         }
 113
 114         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 115                 xs = (struct xenix_super *)
 116                         volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
 117                 if (xs == NULL)
 118                         return -1;
 119
 120                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
 121                         volume_id_set_label_raw(id, xs->s_fname, 6);
 122                         volume_id_set_label_string(id, xs->s_fname, 6);
 123                         id->type = "xenix";
 124                         goto found;
 125                 }
 126         }
 127
 128         return -1;
 129
 130 found:
 131         volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 132         return 0;
 133 }