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 //config:config FEATURE_VOLUMEID_SYSV
  21 //config:       bool "sysv filesystem"
  22 //config:       default y
  23 //config:       depends on VOLUMEID
  24
  25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o
  26
  27 #include "volume_id_internal.h"
  28
  29 #define SYSV_NICINOD                    100
  30 #define SYSV_NICFREE                    50
  31
  32 struct sysv_super {
  33         uint16_t        s_isize;
  34         uint16_t        s_pad0;
  35         uint32_t        s_fsize;
  36         uint16_t        s_nfree;
  37         uint16_t        s_pad1;
  38         uint32_t        s_free[SYSV_NICFREE];
  39         uint16_t        s_ninode;
  40         uint16_t        s_pad2;
  41         uint16_t        s_inode[SYSV_NICINOD];
  42         uint8_t         s_flock;
  43         uint8_t         s_ilock;
  44         uint8_t         s_fmod;
  45         uint8_t         s_ronly;
  46         uint32_t        s_time;
  47         uint16_t        s_dinfo[4];
  48         uint32_t        s_tfree;
  49         uint16_t        s_tinode;
  50         uint16_t        s_pad3;
  51         uint8_t         s_fname[6];
  52         uint8_t         s_fpack[6];
  53         uint32_t        s_fill[12];
  54         uint32_t        s_state;
  55         uint32_t        s_magic;
  56         uint32_t        s_type;
  57 } PACKED;
  58
  59 #define XENIX_NICINOD                           100
  60 #define XENIX_NICFREE                           100
  61
  62 struct xenix_super {
  63         uint16_t        s_isize;
  64         uint32_t        s_fsize;
  65         uint16_t        s_nfree;
  66         uint32_t        s_free[XENIX_NICFREE];
  67         uint16_t        s_ninode;
  68         uint16_t        s_inode[XENIX_NICINOD];
  69         uint8_t         s_flock;
  70         uint8_t         s_ilock;
  71         uint8_t         s_fmod;
  72         uint8_t         s_ronly;
  73         uint32_t        s_time;
  74         uint32_t        s_tfree;
  75         uint16_t        s_tinode;
  76         uint16_t        s_dinfo[4];
  77         uint8_t         s_fname[6];
  78         uint8_t         s_fpack[6];
  79         uint8_t         s_clean;
  80         uint8_t         s_fill[371];
  81         uint32_t        s_magic;
  82         uint32_t        s_type;
  83 } PACKED;
  84
  85 #define SYSV_SUPERBLOCK_BLOCK                   0x01
  86 #define SYSV_MAGIC                              0xfd187e20
  87 #define XENIX_SUPERBLOCK_BLOCK                  0x18
  88 #define XENIX_MAGIC                             0x2b5544
  89 #define SYSV_MAX_BLOCKSIZE                      0x800
  90
  91 int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
  92 {
  93 #define off ((uint64_t)0)
  94         struct sysv_super *vs;
  95         struct xenix_super *xs;
  96         unsigned boff;
  97
  98         dbg("probing at offset 0x%llx", (unsigned long long) off);
  99
 100         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 101                 vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
 102                 if (vs == NULL)
 103                         return -1;
 104
 105                 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
 106 //                      volume_id_set_label_raw(id, vs->s_fname, 6);
 107                         volume_id_set_label_string(id, vs->s_fname, 6);
 108                         IF_FEATURE_BLKID_TYPE(id->type = "sysv");
 109                         goto found;
 110                 }
 111         }
 112
 113         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 114                 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
 115                 if (xs == NULL)
 116                         return -1;
 117
 118                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
 119 //                      volume_id_set_label_raw(id, xs->s_fname, 6);
 120                         volume_id_set_label_string(id, xs->s_fname, 6);
 121                         IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
 122                         goto found;
 123                 }
 124         }
 125
 126         return -1;
 127
 128  found:
 129 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 130         return 0;
 131 }