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 //config:config FEATURE_VOLUMEID_SYSV
  24 //config:       bool "sysv filesystem"
  25 //config:       default y
  26 //config:       depends on VOLUMEID
  27
  28 #include "volume_id_internal.h"
  29
  30 #define SYSV_NICINOD                    100
  31 #define SYSV_NICFREE                    50
  32
  33 struct sysv_super {
  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 FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
  93 {
  94 #define off ((uint64_t)0)
  95         struct sysv_super *vs;
  96         struct xenix_super *xs;
  97         unsigned boff;
  98
  99         dbg("probing at offset 0x%llx", (unsigned long long) off);
 100
 101         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 102                 vs = 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                         IF_FEATURE_BLKID_TYPE(id->type = "sysv");
 110                         goto found;
 111                 }
 112         }
 113
 114         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 115                 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
 116                 if (xs == NULL)
 117                         return -1;
 118
 119                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
 120 //                      volume_id_set_label_raw(id, xs->s_fname, 6);
 121                         volume_id_set_label_string(id, xs->s_fname, 6);
 122                         IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
 123                         goto found;
 124                 }
 125         }
 126
 127         return -1;
 128
 129  found:
 130 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 131         return 0;
 132 }