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//kbuild:lib-$(CONFIG_VOLUMEID) += volume_id.o util.o
  22
  23#include "volume_id_internal.h"
  24
  25
  26/* Some detection routines do not set label or uuid anyway,
  27 * so they are disabled. */
  28
  29/* Looks for partitions, we don't use it: */
  30#define ENABLE_FEATURE_VOLUMEID_MAC           0
  31/* #define ENABLE_FEATURE_VOLUMEID_MSDOS      0 - NB: this one
  32 * was not properly added to probe table anyway - ??! */
  33
  34/* None of RAIDs have label or uuid, except LinuxRAID: */
  35#define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
  36#define ENABLE_FEATURE_VOLUMEID_ISWRAID       0
  37#define ENABLE_FEATURE_VOLUMEID_LSIRAID       0
  38#define ENABLE_FEATURE_VOLUMEID_LVM           0
  39#define ENABLE_FEATURE_VOLUMEID_NVIDIARAID    0
  40#define ENABLE_FEATURE_VOLUMEID_PROMISERAID   0
  41#define ENABLE_FEATURE_VOLUMEID_SILICONRAID   0
  42#define ENABLE_FEATURE_VOLUMEID_VIARAID       0
  43
  44/* These filesystems also have no label or uuid: */
  45#define ENABLE_FEATURE_VOLUMEID_MINIX         0
  46#define ENABLE_FEATURE_VOLUMEID_HPFS          0
  47#define ENABLE_FEATURE_VOLUMEID_UFS           0
  48
  49
  50typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
  51typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
  52
  53static const raid_probe_fptr raid1[] = {
  54#if ENABLE_FEATURE_VOLUMEID_LINUXRAID
  55        volume_id_probe_linux_raid,
  56#endif
  57#if ENABLE_FEATURE_VOLUMEID_ISWRAID
  58        volume_id_probe_intel_software_raid,
  59#endif
  60#if ENABLE_FEATURE_VOLUMEID_LSIRAID
  61        volume_id_probe_lsi_mega_raid,
  62#endif
  63#if ENABLE_FEATURE_VOLUMEID_VIARAID
  64        volume_id_probe_via_raid,
  65#endif
  66#if ENABLE_FEATURE_VOLUMEID_SILICONRAID
  67        volume_id_probe_silicon_medley_raid,
  68#endif
  69#if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
  70        volume_id_probe_nvidia_raid,
  71#endif
  72#if ENABLE_FEATURE_VOLUMEID_PROMISERAID
  73        volume_id_probe_promise_fasttrack_raid,
  74#endif
  75#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  76        volume_id_probe_highpoint_45x_raid,
  77#endif
  78};
  79
  80static const probe_fptr raid2[] = {
  81#if ENABLE_FEATURE_VOLUMEID_LVM
  82        volume_id_probe_lvm1,
  83        volume_id_probe_lvm2,
  84#endif
  85#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  86        volume_id_probe_highpoint_37x_raid,
  87#endif
  88#if ENABLE_FEATURE_VOLUMEID_LUKS
  89        volume_id_probe_luks,
  90#endif
  91};
  92
  93/* signature in the first block, only small buffer needed */
  94static const probe_fptr fs1[] = {
  95#if ENABLE_FEATURE_VOLUMEID_FAT
  96        volume_id_probe_vfat,
  97#endif
  98#if ENABLE_FEATURE_VOLUMEID_EXFAT
  99        volume_id_probe_exfat,
 100#endif
 101#if ENABLE_FEATURE_VOLUMEID_MAC
 102        volume_id_probe_mac_partition_map,
 103#endif
 104#if ENABLE_FEATURE_VOLUMEID_SQUASHFS
 105        volume_id_probe_squashfs,
 106#endif
 107#if ENABLE_FEATURE_VOLUMEID_XFS
 108        volume_id_probe_xfs,
 109#endif
 110};
 111
 112/* fill buffer with maximum */
 113static const probe_fptr fs2[] = {
 114#if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
 115        volume_id_probe_linux_swap,
 116#endif
 117#if ENABLE_FEATURE_VOLUMEID_EXT
 118        volume_id_probe_ext,
 119#endif
 120#if ENABLE_FEATURE_VOLUMEID_BTRFS
 121        volume_id_probe_btrfs,
 122#endif
 123#if ENABLE_FEATURE_VOLUMEID_REISERFS
 124        volume_id_probe_reiserfs,
 125#endif
 126#if ENABLE_FEATURE_VOLUMEID_JFS
 127        volume_id_probe_jfs,
 128#endif
 129#if ENABLE_FEATURE_VOLUMEID_UDF
 130        volume_id_probe_udf,
 131#endif
 132#if ENABLE_FEATURE_VOLUMEID_ISO9660
 133        volume_id_probe_iso9660,
 134#endif
 135#if ENABLE_FEATURE_VOLUMEID_HFS
 136        volume_id_probe_hfs_hfsplus,
 137#endif
 138#if ENABLE_FEATURE_VOLUMEID_UFS
 139        volume_id_probe_ufs,
 140#endif
 141#if ENABLE_FEATURE_VOLUMEID_F2FS
 142        volume_id_probe_f2fs,
 143#endif
 144#if ENABLE_FEATURE_VOLUMEID_NILFS
 145        volume_id_probe_nilfs,
 146#endif
 147#if ENABLE_FEATURE_VOLUMEID_NTFS
 148        volume_id_probe_ntfs,
 149#endif
 150#if ENABLE_FEATURE_VOLUMEID_CRAMFS
 151        volume_id_probe_cramfs,
 152#endif
 153#if ENABLE_FEATURE_VOLUMEID_ROMFS
 154        volume_id_probe_romfs,
 155#endif
 156#if ENABLE_FEATURE_VOLUMEID_HPFS
 157        volume_id_probe_hpfs,
 158#endif
 159#if ENABLE_FEATURE_VOLUMEID_SYSV
 160        volume_id_probe_sysv,
 161#endif
 162#if ENABLE_FEATURE_VOLUMEID_MINIX
 163        volume_id_probe_minix,
 164#endif
 165#if ENABLE_FEATURE_VOLUMEID_OCFS2
 166        volume_id_probe_ocfs2,
 167#endif
 168};
 169
 170int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
 171{
 172        unsigned i;
 173
 174        /* probe for raid first, cause fs probes may be successful on raid members */
 175        if (size) {
 176                for (i = 0; i < ARRAY_SIZE(raid1); i++) {
 177                        if (raid1[i](id, /*off,*/ size) == 0)
 178                                goto ret;
 179                        if (id->error)
 180                                goto ret;
 181                }
 182        }
 183
 184        for (i = 0; i < ARRAY_SIZE(raid2); i++) {
 185                if (raid2[i](id /*,off*/) == 0)
 186                        goto ret;
 187                if (id->error)
 188                        goto ret;
 189        }
 190
 191        /* signature in the first block, only small buffer needed */
 192        for (i = 0; i < ARRAY_SIZE(fs1); i++) {
 193                if (fs1[i](id /*,off*/) == 0)
 194                        goto ret;
 195                if (id->error)
 196                        goto ret;
 197        }
 198
 199        /* fill buffer with maximum */
 200        volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 201
 202        for (i = 0; i < ARRAY_SIZE(fs2); i++) {
 203                if (fs2[i](id /*,off*/) == 0)
 204                        goto ret;
 205                if (id->error)
 206                        goto ret;
 207        }
 208
 209 ret:
 210        volume_id_free_buffer(id);
 211        return (- id->error); /* 0 or -1 */
 212}
 213
 214/* open volume by device node */
 215struct volume_id* FAST_FUNC volume_id_open_node(int fd)
 216{
 217        struct volume_id *id;
 218
 219        id = xzalloc(sizeof(struct volume_id));
 220        id->fd = fd;
 221        ///* close fd on device close */
 222        //id->fd_close = 1;
 223        return id;
 224}
 225
 226#ifdef UNUSED
 227/* open volume by major/minor */
 228struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
 229{
 230        struct volume_id *id;
 231        char *tmp_node[VOLUME_ID_PATH_MAX];
 232
 233        tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
 234                (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
 235
 236        /* create temporary node to open block device */
 237        unlink(tmp_node);
 238        if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
 239                bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
 240
 241        id = volume_id_open_node(tmp_node);
 242        unlink(tmp_node);
 243        free(tmp_node);
 244        return id;
 245}
 246#endif
 247
 248void FAST_FUNC free_volume_id(struct volume_id *id)
 249{
 250        if (id == NULL)
 251                return;
 252
 253        //if (id->fd_close != 0) - always true
 254                close(id->fd);
 255        volume_id_free_buffer(id);
 256#ifdef UNUSED_PARTITION_CODE
 257        free(id->partitions);
 258#endif
 259        free(id);
 260}
 261