LXR busybox/util-linux/volume_id/volume

   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
  48typedef int (*raid_probe_fptr)(struct volume_id *id, uint64_t off, uint64_t size);
  49typedef int (*probe_fptr)(struct volume_id *id, uint64_t off);
  50
  51static 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
  78static 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 */
  92static const probe_fptr fs1[] = {
  93#if ENABLE_FEATURE_VOLUMEID_FAT
  94        volume_id_probe_vfat,
  95#endif
  96#if ENABLE_FEATURE_VOLUMEID_MAC
  97        volume_id_probe_mac_partition_map,
  98#endif
  99#if ENABLE_FEATURE_VOLUMEID_XFS
 100        volume_id_probe_xfs,
 101#endif
 102};
 103
 104/* fill buffer with maximum */
 105static const probe_fptr fs2[] = {
 106#if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
 107        volume_id_probe_linux_swap,
 108#endif
 109#if ENABLE_FEATURE_VOLUMEID_EXT
 110        volume_id_probe_ext,
 111#endif
 112#if ENABLE_FEATURE_VOLUMEID_REISERFS
 113        volume_id_probe_reiserfs,
 114#endif
 115#if ENABLE_FEATURE_VOLUMEID_JFS
 116        volume_id_probe_jfs,
 117#endif
 118#if ENABLE_FEATURE_VOLUMEID_UDF
 119        volume_id_probe_udf,
 120#endif
 121#if ENABLE_FEATURE_VOLUMEID_ISO9660
 122        volume_id_probe_iso9660,
 123#endif
 124#if ENABLE_FEATURE_VOLUMEID_HFS
 125        volume_id_probe_hfs_hfsplus,
 126#endif
 127#if ENABLE_FEATURE_VOLUMEID_UFS
 128        volume_id_probe_ufs,
 129#endif
 130#if ENABLE_FEATURE_VOLUMEID_NTFS
 131        volume_id_probe_ntfs,
 132#endif
 133#if ENABLE_FEATURE_VOLUMEID_CRAMFS
 134        volume_id_probe_cramfs,
 135#endif
 136#if ENABLE_FEATURE_VOLUMEID_ROMFS
 137        volume_id_probe_romfs,
 138#endif
 139#if ENABLE_FEATURE_VOLUMEID_HPFS
 140        volume_id_probe_hpfs,
 141#endif
 142#if ENABLE_FEATURE_VOLUMEID_SYSV
 143        volume_id_probe_sysv,
 144#endif
 145#if ENABLE_FEATURE_VOLUMEID_MINIX
 146        volume_id_probe_minix,
 147#endif
 148#if ENABLE_FEATURE_VOLUMEID_OCFS2
 149        volume_id_probe_ocfs2,
 150#endif
 151};
 152
 153int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 154{
 155        unsigned i;
 156
 157        if (id == NULL)
 158                return -EINVAL;
 159
 160        /* probe for raid first, cause fs probes may be successful on raid members */
 161        if (size) {
 162                for (i = 0; i < ARRAY_SIZE(raid1); i++)
 163                        if (raid1[i](id, off, size) == 0)
 164                                goto ret;
 165        }
 166
 167        for (i = 0; i < ARRAY_SIZE(raid2); i++)
 168                if (raid2[i](id, off) == 0)
 169                        goto ret;
 170
 171        /* signature in the first block, only small buffer needed */
 172        for (i = 0; i < ARRAY_SIZE(fs1); i++)
 173                if (fs1[i](id, off) == 0)
 174                        goto ret;
 175
 176        /* fill buffer with maximum */
 177        volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 178
 179        for (i = 0; i < ARRAY_SIZE(fs2); i++)
 180                if (fs2[i](id, off) == 0)
 181                        goto ret;
 182        return -1;
 183
 184 ret:
 185        /* If the filestystem in recognized, we free the allocated buffers,
 186           otherwise they will stay in place for the possible next probe call */
 187        volume_id_free_buffer(id);
 188
 189        return 0;
 190}
 191
 192/* open volume by device node */
 193struct volume_id *volume_id_open_node(int fd)
 194{
 195        struct volume_id *id;
 196
 197        id = xzalloc(sizeof(struct volume_id));
 198        id->fd = fd;
 199        ///* close fd on device close */
 200        //id->fd_close = 1;
 201        return id;
 202}
 203
 204#ifdef UNUSED
 205/* open volume by major/minor */
 206struct volume_id *volume_id_open_dev_t(dev_t devt)
 207{
 208        struct volume_id *id;
 209        char *tmp_node[VOLUME_ID_PATH_MAX];
 210
 211        tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
 212                (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
 213
 214        /* create temporary node to open block device */
 215        unlink(tmp_node);
 216        if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
 217                bb_perror_msg_and_die("cannot mknod(%s)", tmp_node);
 218
 219        id = volume_id_open_node(tmp_node);
 220        unlink(tmp_node);
 221        free(tmp_node);
 222        return id;
 223}
 224#endif
 225
 226void free_volume_id(struct volume_id *id)
 227{
 228        if (id == NULL)
 229                return;
 230
 231        //if (id->fd_close != 0) - always true
 232                close(id->fd);
 233        volume_id_free_buffer(id);
 234#ifdef UNUSED_PARTITION_CODE
 235        free(id->partitions);
 236#endif
 237        free(id);
 238}
 239