util-linux/volume_id/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 library is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU Lesser General Public
   8  *      License as published by the Free Software Foundation; either
   9  *      version 2.1 of the License, or (at your option) any later version.
  10  *
  11  *      This library is distributed in the hope that it will be useful,
  12  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  *      Lesser General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU Lesser General Public
  17  *      License along with this library; if not, write to the Free Software
  18  *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o
  22
  23 #include "volume_id_internal.h"
  24
  25 #define SYSV_NICINOD                    100
  26 #define SYSV_NICFREE                    50
  27
  28 struct sysv_super {
  29         uint16_t        s_isize;
  30         uint16_t        s_pad0;
  31         uint32_t        s_fsize;
  32         uint16_t        s_nfree;
  33         uint16_t        s_pad1;
  34         uint32_t        s_free[SYSV_NICFREE];
  35         uint16_t        s_ninode;
  36         uint16_t        s_pad2;
  37         uint16_t        s_inode[SYSV_NICINOD];
  38         uint8_t         s_flock;
  39         uint8_t         s_ilock;
  40         uint8_t         s_fmod;
  41         uint8_t         s_ronly;
  42         uint32_t        s_time;
  43         uint16_t        s_dinfo[4];
  44         uint32_t        s_tfree;
  45         uint16_t        s_tinode;
  46         uint16_t        s_pad3;
  47         uint8_t         s_fname[6];
  48         uint8_t         s_fpack[6];
  49         uint32_t        s_fill[12];
  50         uint32_t        s_state;
  51         uint32_t        s_magic;
  52         uint32_t        s_type;
  53 } PACKED;
  54
  55 #define XENIX_NICINOD                           100
  56 #define XENIX_NICFREE                           100
  57
  58 struct xenix_super {
  59         uint16_t        s_isize;
  60         uint32_t        s_fsize;
  61         uint16_t        s_nfree;
  62         uint32_t        s_free[XENIX_NICFREE];
  63         uint16_t        s_ninode;
  64         uint16_t        s_inode[XENIX_NICINOD];
  65         uint8_t         s_flock;
  66         uint8_t         s_ilock;
  67         uint8_t         s_fmod;
  68         uint8_t         s_ronly;
  69         uint32_t        s_time;
  70         uint32_t        s_tfree;
  71         uint16_t        s_tinode;
  72         uint16_t        s_dinfo[4];
  73         uint8_t         s_fname[6];
  74         uint8_t         s_fpack[6];
  75         uint8_t         s_clean;
  76         uint8_t         s_fill[371];
  77         uint32_t        s_magic;
  78         uint32_t        s_type;
  79 } PACKED;
  80
  81 #define SYSV_SUPERBLOCK_BLOCK                   0x01
  82 #define SYSV_MAGIC                              0xfd187e20
  83 #define XENIX_SUPERBLOCK_BLOCK                  0x18
  84 #define XENIX_MAGIC                             0x2b5544
  85 #define SYSV_MAX_BLOCKSIZE                      0x800
  86
  87 int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
  88 {
  89 #define off ((uint64_t)0)
  90         struct sysv_super *vs;
  91         struct xenix_super *xs;
  92         unsigned boff;
  93
  94         dbg("probing at offset 0x%llx", (unsigned long long) off);
  95
  96         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
  97                 vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
  98                 if (vs == NULL)
  99                         return -1;
 100
 101                 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
 102 //                      volume_id_set_label_raw(id, vs->s_fname, 6);
 103                         volume_id_set_label_string(id, vs->s_fname, 6);
 104                         IF_FEATURE_BLKID_TYPE(id->type = "sysv");
 105                         goto found;
 106                 }
 107         }
 108
 109         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 110                 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
 111                 if (xs == NULL)
 112                         return -1;
 113
 114                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
 115 //                      volume_id_set_label_raw(id, xs->s_fname, 6);
 116                         volume_id_set_label_string(id, xs->s_fname, 6);
 117                         IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
 118                         goto found;
 119                 }
 120         }
 121
 122         return -1;
 123
 124  found:
 125 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 126         return 0;
 127 }