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