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 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_SYSV) += sysv.o
  22
  23 //config:
  24 //config:config FEATURE_VOLUMEID_SYSV
  25 //config:       bool "sysv filesystem"
  26 //config:       default y
  27 //config:       depends on VOLUMEID
  28 //config:       help
  29 //config:         TODO
  30 //config:
  31
  32 #include "volume_id_internal.h"
  33
  34 #define SYSV_NICINOD                    100
  35 #define SYSV_NICFREE                    50
  36
  37 struct sysv_super {
  38         uint16_t        s_isize;
  39         uint16_t        s_pad0;
  40         uint32_t        s_fsize;
  41         uint16_t        s_nfree;
  42         uint16_t        s_pad1;
  43         uint32_t        s_free[SYSV_NICFREE];
  44         uint16_t        s_ninode;
  45         uint16_t        s_pad2;
  46         uint16_t        s_inode[SYSV_NICINOD];
  47         uint8_t         s_flock;
  48         uint8_t         s_ilock;
  49         uint8_t         s_fmod;
  50         uint8_t         s_ronly;
  51         uint32_t        s_time;
  52         uint16_t        s_dinfo[4];
  53         uint32_t        s_tfree;
  54         uint16_t        s_tinode;
  55         uint16_t        s_pad3;
  56         uint8_t         s_fname[6];
  57         uint8_t         s_fpack[6];
  58         uint32_t        s_fill[12];
  59         uint32_t        s_state;
  60         uint32_t        s_magic;
  61         uint32_t        s_type;
  62 } PACKED;
  63
  64 #define XENIX_NICINOD                           100
  65 #define XENIX_NICFREE                           100
  66
  67 struct xenix_super {
  68         uint16_t        s_isize;
  69         uint32_t        s_fsize;
  70         uint16_t        s_nfree;
  71         uint32_t        s_free[XENIX_NICFREE];
  72         uint16_t        s_ninode;
  73         uint16_t        s_inode[XENIX_NICINOD];
  74         uint8_t         s_flock;
  75         uint8_t         s_ilock;
  76         uint8_t         s_fmod;
  77         uint8_t         s_ronly;
  78         uint32_t        s_time;
  79         uint32_t        s_tfree;
  80         uint16_t        s_tinode;
  81         uint16_t        s_dinfo[4];
  82         uint8_t         s_fname[6];
  83         uint8_t         s_fpack[6];
  84         uint8_t         s_clean;
  85         uint8_t         s_fill[371];
  86         uint32_t        s_magic;
  87         uint32_t        s_type;
  88 } PACKED;
  89
  90 #define SYSV_SUPERBLOCK_BLOCK                   0x01
  91 #define SYSV_MAGIC                              0xfd187e20
  92 #define XENIX_SUPERBLOCK_BLOCK                  0x18
  93 #define XENIX_MAGIC                             0x2b5544
  94 #define SYSV_MAX_BLOCKSIZE                      0x800
  95
  96 int FAST_FUNC volume_id_probe_sysv(struct volume_id *id /*,uint64_t off*/)
  97 {
  98 #define off ((uint64_t)0)
  99         struct sysv_super *vs;
 100         struct xenix_super *xs;
 101         unsigned boff;
 102
 103         dbg("probing at offset 0x%llx", (unsigned long long) off);
 104
 105         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 106                 vs = volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
 107                 if (vs == NULL)
 108                         return -1;
 109
 110                 if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
 111 //                      volume_id_set_label_raw(id, vs->s_fname, 6);
 112                         volume_id_set_label_string(id, vs->s_fname, 6);
 113                         IF_FEATURE_BLKID_TYPE(id->type = "sysv");
 114                         goto found;
 115                 }
 116         }
 117
 118         for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
 119                 xs = volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
 120                 if (xs == NULL)
 121                         return -1;
 122
 123                 if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
 124 //                      volume_id_set_label_raw(id, xs->s_fname, 6);
 125                         volume_id_set_label_string(id, xs->s_fname, 6);
 126                         IF_FEATURE_BLKID_TYPE(id->type = "xenix";)
 127                         goto found;
 128                 }
 129         }
 130
 131         return -1;
 132
 133  found:
 134 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 135         return 0;
 136 }