release/src/router/busybox/util-linux/volume_id/volume_id.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
  24 /* Some detection routines do not set label or uuid anyway,
  25  * so they are disabled. */
  26
  27 /* Looks for partitions, we don't use it: */
  28 #define ENABLE_FEATURE_VOLUMEID_MAC           0
  29 /* #define ENABLE_FEATURE_VOLUMEID_MSDOS      0 - NB: this one
  30  * was not properly added to probe table anyway - ??! */
  31
  32 /* None of RAIDs have label or uuid, except LinuxRAID: */
  33 #define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
  34 #define ENABLE_FEATURE_VOLUMEID_ISWRAID       0
  35 #define ENABLE_FEATURE_VOLUMEID_LSIRAID       0
  36 #define ENABLE_FEATURE_VOLUMEID_LVM           0
  37 #define ENABLE_FEATURE_VOLUMEID_NVIDIARAID    0
  38 #define ENABLE_FEATURE_VOLUMEID_PROMISERAID   0
  39 #define ENABLE_FEATURE_VOLUMEID_SILICONRAID   0
  40 #define ENABLE_FEATURE_VOLUMEID_VIARAID       0
  41
  42 /* These filesystems also have no label or uuid: */
  43 #define ENABLE_FEATURE_VOLUMEID_MINIX         0
  44 #define ENABLE_FEATURE_VOLUMEID_HPFS          0
  45 #define ENABLE_FEATURE_VOLUMEID_UFS           0
  46
  47
  48 typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
  49 typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
  50
  51 static const raid_probe_fptr raid1[] = {
  52 #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
  53         volume_id_probe_linux_raid,
  54 #endif
  55 #if ENABLE_FEATURE_VOLUMEID_ISWRAID
  56         volume_id_probe_intel_software_raid,
  57 #endif
  58 #if ENABLE_FEATURE_VOLUMEID_LSIRAID
  59         volume_id_probe_lsi_mega_raid,
  60 #endif
  61 #if ENABLE_FEATURE_VOLUMEID_VIARAID
  62         volume_id_probe_via_raid,
  63 #endif
  64 #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
  65         volume_id_probe_silicon_medley_raid,
  66 #endif
  67 #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
  68         volume_id_probe_nvidia_raid,
  69 #endif
  70 #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
  71         volume_id_probe_promise_fasttrack_raid,
  72 #endif
  73 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  74         volume_id_probe_highpoint_45x_raid,
  75 #endif
  76 };
  77
  78 static const probe_fptr raid2[] = {
  79 #if ENABLE_FEATURE_VOLUMEID_LVM
  80         volume_id_probe_lvm1,
  81         volume_id_probe_lvm2,
  82 #endif
  83 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  84         volume_id_probe_highpoint_37x_raid,
  85 #endif
  86 #if ENABLE_FEATURE_VOLUMEID_LUKS
  87         volume_id_probe_luks,
  88 #endif
  89 };
  90
  91 /* signature in the first block, only small buffer needed */
  92 static const probe_fptr fs1[] = {
  93 #if ENABLE_FEATURE_VOLUMEID_FAT
  94         volume_id_probe_vfat,
  95 #endif
  96 #if ENABLE_FEATURE_VOLUMEID_EXFAT
  97         volume_id_probe_exfat,
  98 #endif
  99 #if ENABLE_FEATURE_VOLUMEID_MAC
 100         volume_id_probe_mac_partition_map,
 101 #endif
 102 #if ENABLE_FEATURE_VOLUMEID_XFS
 103         volume_id_probe_xfs,
 104 #endif
 105 };
 106
 107 /* fill buffer with maximum */
 108 static const probe_fptr fs2[] = {
 109 #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
 110         volume_id_probe_linux_swap,
 111 #endif
 112 #if ENABLE_FEATURE_VOLUMEID_EXT
 113         volume_id_probe_ext,
 114 #endif
 115 #if ENABLE_FEATURE_VOLUMEID_BTRFS
 116         volume_id_probe_btrfs,
 117 #endif
 118 #if ENABLE_FEATURE_VOLUMEID_REISERFS
 119         volume_id_probe_reiserfs,
 120 #endif
 121 #if ENABLE_FEATURE_VOLUMEID_JFS
 122         volume_id_probe_jfs,
 123 #endif
 124 #if ENABLE_FEATURE_VOLUMEID_UDF
 125         volume_id_probe_udf,
 126 #endif
 127 #if ENABLE_FEATURE_VOLUMEID_ISO9660
 128         volume_id_probe_iso9660,
 129 #endif
 130 #if ENABLE_FEATURE_VOLUMEID_HFS
 131         volume_id_probe_hfs_hfsplus,
 132 #endif
 133 #if ENABLE_FEATURE_VOLUMEID_UFS
 134         volume_id_probe_ufs,
 135 #endif
 136 #if ENABLE_FEATURE_VOLUMEID_NTFS
 137         volume_id_probe_ntfs,
 138 #endif
 139 #if ENABLE_FEATURE_VOLUMEID_CRAMFS
 140         volume_id_probe_cramfs,
 141 #endif
 142 #if ENABLE_FEATURE_VOLUMEID_ROMFS
 143         volume_id_probe_romfs,
 144 #endif
 145 #if ENABLE_FEATURE_VOLUMEID_HPFS
 146         volume_id_probe_hpfs,
 147 #endif
 148 #if ENABLE_FEATURE_VOLUMEID_SYSV
 149         volume_id_probe_sysv,
 150 #endif
 151 #if ENABLE_FEATURE_VOLUMEID_MINIX
 152         volume_id_probe_minix,
 153 #endif
 154 #if ENABLE_FEATURE_VOLUMEID_OCFS2
 155         volume_id_probe_ocfs2,
 156 #endif
 157 };
 158
 159 int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
 160 {
 161         unsigned i;
 162
 163         /* probe for raid first, cause fs probes may be successful on raid members */
 164         if (size) {
 165                 for (i = 0; i < ARRAY_SIZE(raid1); i++) {
 166                         if (raid1[i](id, /*off,*/ size) == 0)
 167                                 goto ret;
 168                         if (id->error)
 169                                 goto ret;
 170                 }
 171         }
 172
 173         for (i = 0; i < ARRAY_SIZE(raid2); i++) {
 174                 if (raid2[i](id /*,off*/) == 0)
 175                         goto ret;
 176                 if (id->error)
 177                         goto ret;
 178         }
 179
 180         /* signature in the first block, only small buffer needed */
 181         for (i = 0; i < ARRAY_SIZE(fs1); i++) {
 182                 if (fs1[i](id /*,off*/) == 0)
 183                         goto ret;
 184                 if (id->error)
 185                         goto ret;
 186         }
 187
 188         /* fill buffer with maximum */
 189         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 190
 191         for (i = 0; i < ARRAY_SIZE(fs2); i++) {
 192                 if (fs2[i](id /*,off*/) == 0)
 193                         goto ret;
 194                 if (id->error)
 195                         goto ret;
 196         }
 197
 198  ret:
 199         volume_id_free_buffer(id);
 200         return (- id->error); /* 0 or -1 */
 201 }
 202
 203 /* open volume by device node */
 204 struct volume_id* FAST_FUNC volume_id_open_node(int fd)
 205 {
 206         struct volume_id *id;
 207
 208         id = xzalloc(sizeof(struct volume_id));
 209         id->fd = fd;
 210         ///* close fd on device close */
 211         //id->fd_close = 1;
 212         return id;
 213 }
 214
 215 #ifdef UNUSED
 216 /* open volume by major/minor */
 217 struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
 218 {
 219         struct volume_id *id;
 220         char *tmp_node[VOLUME_ID_PATH_MAX];
 221
 222         tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
 223                 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
 224
 225         /* create temporary node to open block device */
 226         unlink(tmp_node);
 227         if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
 228                 bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
 229
 230         id = volume_id_open_node(tmp_node);
 231         unlink(tmp_node);
 232         free(tmp_node);
 233         return id;
 234 }
 235 #endif
 236
 237 void FAST_FUNC free_volume_id(struct volume_id *id)
 238 {
 239         if (id == NULL)
 240                 return;
 241
 242         //if (id->fd_close != 0) - always true
 243                 close(id->fd);
 244         volume_id_free_buffer(id);
 245 #ifdef UNUSED_PARTITION_CODE
 246         free(id->partitions);
 247 #endif
 248         free(id);
 249 }