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 //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_HPFS          0
  46 #define ENABLE_FEATURE_VOLUMEID_UFS           0
  47
  48
  49 typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
  50 typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
  51
  52 static const raid_probe_fptr raid1[] = {
  53 #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
  54         volume_id_probe_linux_raid,
  55 #endif
  56 #if ENABLE_FEATURE_VOLUMEID_ISWRAID
  57         volume_id_probe_intel_software_raid,
  58 #endif
  59 #if ENABLE_FEATURE_VOLUMEID_LSIRAID
  60         volume_id_probe_lsi_mega_raid,
  61 #endif
  62 #if ENABLE_FEATURE_VOLUMEID_VIARAID
  63         volume_id_probe_via_raid,
  64 #endif
  65 #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
  66         volume_id_probe_silicon_medley_raid,
  67 #endif
  68 #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
  69         volume_id_probe_nvidia_raid,
  70 #endif
  71 #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
  72         volume_id_probe_promise_fasttrack_raid,
  73 #endif
  74 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  75         volume_id_probe_highpoint_45x_raid,
  76 #endif
  77 };
  78
  79 static const probe_fptr raid2[] = {
  80 #if ENABLE_FEATURE_VOLUMEID_LVM
  81         volume_id_probe_lvm1,
  82         volume_id_probe_lvm2,
  83 #endif
  84 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
  85         volume_id_probe_highpoint_37x_raid,
  86 #endif
  87 #if ENABLE_FEATURE_VOLUMEID_LUKS
  88         volume_id_probe_luks,
  89 #endif
  90 };
  91
  92 /* signature in the first block, only small buffer needed */
  93 static const probe_fptr fs1[] = {
  94 #if ENABLE_FEATURE_VOLUMEID_FAT
  95         volume_id_probe_vfat,
  96 #endif
  97 #if ENABLE_FEATURE_VOLUMEID_EXFAT
  98         volume_id_probe_exfat,
  99 #endif
 100 #if ENABLE_FEATURE_VOLUMEID_MAC
 101         volume_id_probe_mac_partition_map,
 102 #endif
 103 #if ENABLE_FEATURE_VOLUMEID_SQUASHFS
 104         volume_id_probe_squashfs,
 105 #endif
 106 #if ENABLE_FEATURE_VOLUMEID_XFS
 107         volume_id_probe_xfs,
 108 #endif
 109 #if ENABLE_FEATURE_VOLUMEID_BCACHE
 110         volume_id_probe_bcache,
 111 #endif
 112 };
 113
 114 /* fill buffer with maximum */
 115 static const probe_fptr fs2[] = {
 116 #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
 117         volume_id_probe_linux_swap,
 118 #endif
 119 #if ENABLE_FEATURE_VOLUMEID_EXT
 120         volume_id_probe_ext,
 121 #endif
 122 #if ENABLE_FEATURE_VOLUMEID_BTRFS
 123         volume_id_probe_btrfs,
 124 #endif
 125 #if ENABLE_FEATURE_VOLUMEID_REISERFS
 126         volume_id_probe_reiserfs,
 127 #endif
 128 #if ENABLE_FEATURE_VOLUMEID_JFS
 129         volume_id_probe_jfs,
 130 #endif
 131 #if ENABLE_FEATURE_VOLUMEID_UDF
 132         volume_id_probe_udf,
 133 #endif
 134 #if ENABLE_FEATURE_VOLUMEID_ISO9660
 135         volume_id_probe_iso9660,
 136 #endif
 137 #if ENABLE_FEATURE_VOLUMEID_HFS
 138         volume_id_probe_hfs_hfsplus,
 139 #endif
 140 #if ENABLE_FEATURE_VOLUMEID_UFS
 141         volume_id_probe_ufs,
 142 #endif
 143 #if ENABLE_FEATURE_VOLUMEID_F2FS
 144         volume_id_probe_f2fs,
 145 #endif
 146 #if ENABLE_FEATURE_VOLUMEID_NILFS
 147         volume_id_probe_nilfs,
 148 #endif
 149 #if ENABLE_FEATURE_VOLUMEID_NTFS
 150         volume_id_probe_ntfs,
 151 #endif
 152 #if ENABLE_FEATURE_VOLUMEID_CRAMFS
 153         volume_id_probe_cramfs,
 154 #endif
 155 #if ENABLE_FEATURE_VOLUMEID_ROMFS
 156         volume_id_probe_romfs,
 157 #endif
 158 #if ENABLE_FEATURE_VOLUMEID_HPFS
 159         volume_id_probe_hpfs,
 160 #endif
 161 #if ENABLE_FEATURE_VOLUMEID_SYSV
 162         volume_id_probe_sysv,
 163 #endif
 164 #if ENABLE_FEATURE_VOLUMEID_MINIX
 165         volume_id_probe_minix,
 166 #endif
 167 #if ENABLE_FEATURE_VOLUMEID_OCFS2
 168         volume_id_probe_ocfs2,
 169 #endif
 170 #if ENABLE_FEATURE_VOLUMEID_UBIFS
 171         volume_id_probe_ubifs,
 172 #endif
 173 };
 174
 175 int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
 176 {
 177         unsigned i;
 178
 179         /* probe for raid first, cause fs probes may be successful on raid members */
 180         if (size) {
 181                 for (i = 0; i < ARRAY_SIZE(raid1); i++) {
 182                         if (raid1[i](id, /*off,*/ size) == 0)
 183                                 goto ret;
 184                         if (id->error)
 185                                 goto ret;
 186                 }
 187         }
 188
 189         for (i = 0; i < ARRAY_SIZE(raid2); i++) {
 190                 if (raid2[i](id /*,off*/) == 0)
 191                         goto ret;
 192                 if (id->error)
 193                         goto ret;
 194         }
 195
 196         /* signature in the first block, only small buffer needed */
 197         for (i = 0; i < ARRAY_SIZE(fs1); i++) {
 198                 if (fs1[i](id /*,off*/) == 0)
 199                         goto ret;
 200                 if (id->error)
 201                         goto ret;
 202         }
 203
 204         /* fill buffer with maximum */
 205         volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
 206
 207         for (i = 0; i < ARRAY_SIZE(fs2); i++) {
 208                 if (fs2[i](id /*,off*/) == 0)
 209                         goto ret;
 210                 if (id->error)
 211                         goto ret;
 212         }
 213
 214  ret:
 215         volume_id_free_buffer(id);
 216         return (- id->error); /* 0 or -1 */
 217 }
 218
 219 /* open volume by device node */
 220 struct volume_id* FAST_FUNC volume_id_open_node(int fd)
 221 {
 222         struct volume_id *id;
 223
 224         id = xzalloc(sizeof(struct volume_id));
 225         id->fd = fd;
 226         ///* close fd on device close */
 227         //id->fd_close = 1;
 228         return id;
 229 }
 230
 231 #ifdef UNUSED
 232 /* open volume by major/minor */
 233 struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
 234 {
 235         struct volume_id *id;
 236         char *tmp_node[VOLUME_ID_PATH_MAX];
 237
 238         tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
 239                 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
 240
 241         /* create temporary node to open block device */
 242         unlink(tmp_node);
 243         if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
 244                 bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
 245
 246         id = volume_id_open_node(tmp_node);
 247         unlink(tmp_node);
 248         free(tmp_node);
 249         return id;
 250 }
 251 #endif
 252
 253 void FAST_FUNC free_volume_id(struct volume_id *id)
 254 {
 255         if (id == NULL)
 256                 return;
 257
 258         //if (id->fd_close != 0) - always true
 259                 close(id->fd);
 260         volume_id_free_buffer(id);
 261 #ifdef UNUSED_PARTITION_CODE
 262         free(id->partitions);
 263 #endif
 264         free(id);
 265 }