1 | /*
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2 | * volume_id - reads filesystem label and uuid
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3 | *
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4 | * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU Lesser General Public
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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11 | * This library is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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17 | * License along with this library; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 | */
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20 |
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21 | #include "volume_id_internal.h"
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22 |
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23 |
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24 | /* Some detection routines do not set label or uuid anyway,
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25 | * so they are disabled. */
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26 |
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27 | /* Looks for partitions, we don't use it: */
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28 | #define ENABLE_FEATURE_VOLUMEID_MAC 0
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29 | /* #define ENABLE_FEATURE_VOLUMEID_MSDOS 0 - NB: this one
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30 | * was not properly added to probe table anyway - ??! */
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31 |
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32 | /* None of RAIDs have label or uuid, except LinuxRAID: */
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33 | #define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
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34 | #define ENABLE_FEATURE_VOLUMEID_ISWRAID 0
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35 | #define ENABLE_FEATURE_VOLUMEID_LSIRAID 0
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36 | #define ENABLE_FEATURE_VOLUMEID_LVM 0
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37 | #define ENABLE_FEATURE_VOLUMEID_NVIDIARAID 0
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38 | #define ENABLE_FEATURE_VOLUMEID_PROMISERAID 0
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39 | #define ENABLE_FEATURE_VOLUMEID_SILICONRAID 0
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40 | #define ENABLE_FEATURE_VOLUMEID_VIARAID 0
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41 |
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42 | /* These filesystems also have no label or uuid: */
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43 | #define ENABLE_FEATURE_VOLUMEID_MINIX 0
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44 | #define ENABLE_FEATURE_VOLUMEID_HPFS 0
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45 | #define ENABLE_FEATURE_VOLUMEID_UFS 0
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46 |
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47 |
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48 | typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
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49 | typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
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50 |
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51 | static const raid_probe_fptr raid1[] = {
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52 | #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
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53 | volume_id_probe_linux_raid,
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54 | #endif
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55 | #if ENABLE_FEATURE_VOLUMEID_ISWRAID
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56 | volume_id_probe_intel_software_raid,
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57 | #endif
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58 | #if ENABLE_FEATURE_VOLUMEID_LSIRAID
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59 | volume_id_probe_lsi_mega_raid,
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60 | #endif
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61 | #if ENABLE_FEATURE_VOLUMEID_VIARAID
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62 | volume_id_probe_via_raid,
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63 | #endif
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64 | #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
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65 | volume_id_probe_silicon_medley_raid,
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66 | #endif
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67 | #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
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68 | volume_id_probe_nvidia_raid,
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69 | #endif
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70 | #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
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71 | volume_id_probe_promise_fasttrack_raid,
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72 | #endif
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73 | #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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74 | volume_id_probe_highpoint_45x_raid,
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75 | #endif
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76 | };
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77 |
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78 | static const probe_fptr raid2[] = {
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79 | #if ENABLE_FEATURE_VOLUMEID_LVM
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80 | volume_id_probe_lvm1,
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81 | volume_id_probe_lvm2,
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82 | #endif
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83 | #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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84 | volume_id_probe_highpoint_37x_raid,
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85 | #endif
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86 | #if ENABLE_FEATURE_VOLUMEID_LUKS
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87 | volume_id_probe_luks,
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88 | #endif
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89 | };
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90 |
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91 | /* signature in the first block, only small buffer needed */
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92 | static const probe_fptr fs1[] = {
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93 | #if ENABLE_FEATURE_VOLUMEID_FAT
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94 | volume_id_probe_vfat,
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95 | #endif
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96 | #if ENABLE_FEATURE_VOLUMEID_MAC
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97 | volume_id_probe_mac_partition_map,
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98 | #endif
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99 | #if ENABLE_FEATURE_VOLUMEID_XFS
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100 | volume_id_probe_xfs,
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101 | #endif
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102 | };
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103 |
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104 | /* fill buffer with maximum */
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105 | static const probe_fptr fs2[] = {
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106 | #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
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107 | volume_id_probe_linux_swap,
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108 | #endif
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109 | #if ENABLE_FEATURE_VOLUMEID_EXT
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110 | volume_id_probe_ext,
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111 | #endif
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112 | #if ENABLE_FEATURE_VOLUMEID_BTRFS
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113 | volume_id_probe_btrfs,
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114 | #endif
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115 | #if ENABLE_FEATURE_VOLUMEID_REISERFS
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116 | volume_id_probe_reiserfs,
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117 | #endif
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118 | #if ENABLE_FEATURE_VOLUMEID_JFS
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119 | volume_id_probe_jfs,
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120 | #endif
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121 | #if ENABLE_FEATURE_VOLUMEID_UDF
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122 | volume_id_probe_udf,
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123 | #endif
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124 | #if ENABLE_FEATURE_VOLUMEID_ISO9660
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125 | volume_id_probe_iso9660,
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126 | #endif
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127 | #if ENABLE_FEATURE_VOLUMEID_HFS
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128 | volume_id_probe_hfs_hfsplus,
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129 | #endif
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130 | #if ENABLE_FEATURE_VOLUMEID_UFS
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131 | volume_id_probe_ufs,
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132 | #endif
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133 | #if ENABLE_FEATURE_VOLUMEID_NTFS
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134 | volume_id_probe_ntfs,
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135 | #endif
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136 | #if ENABLE_FEATURE_VOLUMEID_CRAMFS
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137 | volume_id_probe_cramfs,
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138 | #endif
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139 | #if ENABLE_FEATURE_VOLUMEID_ROMFS
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140 | volume_id_probe_romfs,
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141 | #endif
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142 | #if ENABLE_FEATURE_VOLUMEID_HPFS
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143 | volume_id_probe_hpfs,
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144 | #endif
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145 | #if ENABLE_FEATURE_VOLUMEID_SYSV
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146 | volume_id_probe_sysv,
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147 | #endif
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148 | #if ENABLE_FEATURE_VOLUMEID_MINIX
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149 | volume_id_probe_minix,
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150 | #endif
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151 | #if ENABLE_FEATURE_VOLUMEID_OCFS2
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152 | volume_id_probe_ocfs2,
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153 | #endif
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154 | };
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155 |
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156 | int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
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157 | {
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158 | unsigned i;
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159 |
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160 | /* probe for raid first, cause fs probes may be successful on raid members */
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161 | if (size) {
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162 | for (i = 0; i < ARRAY_SIZE(raid1); i++) {
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163 | if (raid1[i](id, /*off,*/ size) == 0)
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164 | goto ret;
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165 | if (id->error)
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166 | goto ret;
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167 | }
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168 | }
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169 |
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170 | for (i = 0; i < ARRAY_SIZE(raid2); i++) {
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171 | if (raid2[i](id /*,off*/) == 0)
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172 | goto ret;
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173 | if (id->error)
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174 | goto ret;
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175 | }
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176 |
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177 | /* signature in the first block, only small buffer needed */
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178 | for (i = 0; i < ARRAY_SIZE(fs1); i++) {
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179 | if (fs1[i](id /*,off*/) == 0)
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180 | goto ret;
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181 | if (id->error)
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182 | goto ret;
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183 | }
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184 |
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185 | /* fill buffer with maximum */
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186 | volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
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187 |
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188 | for (i = 0; i < ARRAY_SIZE(fs2); i++) {
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189 | if (fs2[i](id /*,off*/) == 0)
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190 | goto ret;
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191 | if (id->error)
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192 | goto ret;
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193 | }
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194 |
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195 | ret:
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196 | volume_id_free_buffer(id);
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197 | return (- id->error); /* 0 or -1 */
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198 | }
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199 |
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200 | /* open volume by device node */
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201 | struct volume_id* FAST_FUNC volume_id_open_node(int fd)
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202 | {
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203 | struct volume_id *id;
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204 |
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205 | id = xzalloc(sizeof(struct volume_id));
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206 | id->fd = fd;
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207 | ///* close fd on device close */
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208 | //id->fd_close = 1;
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209 | return id;
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210 | }
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211 |
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212 | #ifdef UNUSED
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213 | /* open volume by major/minor */
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214 | struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
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215 | {
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216 | struct volume_id *id;
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217 | char *tmp_node[VOLUME_ID_PATH_MAX];
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218 |
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219 | tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
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220 | (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
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221 |
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222 | /* create temporary node to open block device */
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223 | unlink(tmp_node);
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224 | if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
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225 | bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
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226 |
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227 | id = volume_id_open_node(tmp_node);
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228 | unlink(tmp_node);
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229 | free(tmp_node);
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230 | return id;
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231 | }
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232 | #endif
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233 |
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234 | void FAST_FUNC free_volume_id(struct volume_id *id)
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235 | {
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236 | if (id == NULL)
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237 | return;
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238 |
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239 | //if (id->fd_close != 0) - always true
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240 | close(id->fd);
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241 | volume_id_free_buffer(id);
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242 | #ifdef UNUSED_PARTITION_CODE
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243 | free(id->partitions);
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244 | #endif
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245 | free(id);
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246 | }
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