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_MINIX         0
  46 #define ENABLE_FEATURE_VOLUMEID_HPFS          0
  47 #define ENABLE_FEATURE_VOLUMEID_UFS           0
  48
  49
  50 typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
  51 typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
  52
  53 static 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
  80 static 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 */
  94 static 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 */
 113 static 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
 170 int 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 */
 215 struct 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 */
 228 struct 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
 248 void 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 }