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 | //kbuild:lib-$(CONFIG_VOLUMEID) += volume_id.o util.o
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22 |
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23 | #include "volume_id_internal.h"
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24 |
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25 |
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26 | /* Some detection routines do not set label or uuid anyway,
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27 | * so they are disabled. */
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28 |
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29 | /* Looks for partitions, we don't use it: */
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30 | #define ENABLE_FEATURE_VOLUMEID_MAC 0
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31 | /* #define ENABLE_FEATURE_VOLUMEID_MSDOS 0 - NB: this one
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32 | * was not properly added to probe table anyway - ??! */
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33 |
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34 | /* None of RAIDs have label or uuid, except LinuxRAID: */
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35 | #define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
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36 | #define ENABLE_FEATURE_VOLUMEID_ISWRAID 0
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37 | #define ENABLE_FEATURE_VOLUMEID_LSIRAID 0
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38 | #define ENABLE_FEATURE_VOLUMEID_LVM 0
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39 | #define ENABLE_FEATURE_VOLUMEID_NVIDIARAID 0
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40 | #define ENABLE_FEATURE_VOLUMEID_PROMISERAID 0
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41 | #define ENABLE_FEATURE_VOLUMEID_SILICONRAID 0
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42 | #define ENABLE_FEATURE_VOLUMEID_VIARAID 0
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43 |
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44 | /* These filesystems also have no label or uuid: */
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45 | #define ENABLE_FEATURE_VOLUMEID_MINIX 0
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46 | #define ENABLE_FEATURE_VOLUMEID_HPFS 0
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47 | #define ENABLE_FEATURE_VOLUMEID_UFS 0
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48 |
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49 |
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50 | typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
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51 | typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
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52 |
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53 | static const raid_probe_fptr raid1[] = {
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54 | #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
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55 | volume_id_probe_linux_raid,
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56 | #endif
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57 | #if ENABLE_FEATURE_VOLUMEID_ISWRAID
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58 | volume_id_probe_intel_software_raid,
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59 | #endif
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60 | #if ENABLE_FEATURE_VOLUMEID_LSIRAID
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61 | volume_id_probe_lsi_mega_raid,
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62 | #endif
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63 | #if ENABLE_FEATURE_VOLUMEID_VIARAID
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64 | volume_id_probe_via_raid,
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65 | #endif
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66 | #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
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67 | volume_id_probe_silicon_medley_raid,
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68 | #endif
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69 | #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
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70 | volume_id_probe_nvidia_raid,
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71 | #endif
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72 | #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
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73 | volume_id_probe_promise_fasttrack_raid,
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74 | #endif
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75 | #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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76 | volume_id_probe_highpoint_45x_raid,
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77 | #endif
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78 | };
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79 |
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80 | static const probe_fptr raid2[] = {
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81 | #if ENABLE_FEATURE_VOLUMEID_LVM
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82 | volume_id_probe_lvm1,
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83 | volume_id_probe_lvm2,
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84 | #endif
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85 | #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
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86 | volume_id_probe_highpoint_37x_raid,
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87 | #endif
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88 | #if ENABLE_FEATURE_VOLUMEID_LUKS
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89 | volume_id_probe_luks,
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90 | #endif
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91 | };
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92 |
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93 | /* signature in the first block, only small buffer needed */
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94 | static const probe_fptr fs1[] = {
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95 | #if ENABLE_FEATURE_VOLUMEID_FAT
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96 | volume_id_probe_vfat,
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97 | #endif
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98 | #if ENABLE_FEATURE_VOLUMEID_EXFAT
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99 | volume_id_probe_exfat,
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100 | #endif
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101 | #if ENABLE_FEATURE_VOLUMEID_MAC
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102 | volume_id_probe_mac_partition_map,
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103 | #endif
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104 | #if ENABLE_FEATURE_VOLUMEID_SQUASHFS
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105 | volume_id_probe_squashfs,
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106 | #endif
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107 | #if ENABLE_FEATURE_VOLUMEID_XFS
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108 | volume_id_probe_xfs,
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109 | #endif
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110 | #if ENABLE_FEATURE_VOLUMEID_BCACHE
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111 | volume_id_probe_bcache,
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112 | #endif
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113 | };
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114 |
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115 | /* fill buffer with maximum */
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116 | static const probe_fptr fs2[] = {
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117 | #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
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118 | volume_id_probe_linux_swap,
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119 | #endif
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120 | #if ENABLE_FEATURE_VOLUMEID_EXT
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121 | volume_id_probe_ext,
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122 | #endif
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123 | #if ENABLE_FEATURE_VOLUMEID_BTRFS
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124 | volume_id_probe_btrfs,
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125 | #endif
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126 | #if ENABLE_FEATURE_VOLUMEID_REISERFS
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127 | volume_id_probe_reiserfs,
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128 | #endif
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129 | #if ENABLE_FEATURE_VOLUMEID_JFS
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130 | volume_id_probe_jfs,
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131 | #endif
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132 | #if ENABLE_FEATURE_VOLUMEID_UDF
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133 | volume_id_probe_udf,
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134 | #endif
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135 | #if ENABLE_FEATURE_VOLUMEID_ISO9660
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136 | volume_id_probe_iso9660,
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137 | #endif
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138 | #if ENABLE_FEATURE_VOLUMEID_HFS
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139 | volume_id_probe_hfs_hfsplus,
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140 | #endif
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141 | #if ENABLE_FEATURE_VOLUMEID_UFS
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142 | volume_id_probe_ufs,
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143 | #endif
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144 | #if ENABLE_FEATURE_VOLUMEID_F2FS
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145 | volume_id_probe_f2fs,
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146 | #endif
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147 | #if ENABLE_FEATURE_VOLUMEID_NILFS
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148 | volume_id_probe_nilfs,
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149 | #endif
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150 | #if ENABLE_FEATURE_VOLUMEID_NTFS
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151 | volume_id_probe_ntfs,
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152 | #endif
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153 | #if ENABLE_FEATURE_VOLUMEID_CRAMFS
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154 | volume_id_probe_cramfs,
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155 | #endif
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156 | #if ENABLE_FEATURE_VOLUMEID_ROMFS
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157 | volume_id_probe_romfs,
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158 | #endif
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159 | #if ENABLE_FEATURE_VOLUMEID_HPFS
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160 | volume_id_probe_hpfs,
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161 | #endif
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162 | #if ENABLE_FEATURE_VOLUMEID_SYSV
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163 | volume_id_probe_sysv,
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164 | #endif
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165 | #if ENABLE_FEATURE_VOLUMEID_MINIX
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166 | volume_id_probe_minix,
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167 | #endif
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168 | #if ENABLE_FEATURE_VOLUMEID_OCFS2
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169 | volume_id_probe_ocfs2,
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170 | #endif
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171 | };
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172 |
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173 | int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
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174 | {
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175 | unsigned i;
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176 |
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177 | /* probe for raid first, cause fs probes may be successful on raid members */
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178 | if (size) {
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179 | for (i = 0; i < ARRAY_SIZE(raid1); i++) {
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180 | if (raid1[i](id, /*off,*/ size) == 0)
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181 | goto ret;
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182 | if (id->error)
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183 | goto ret;
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184 | }
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185 | }
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186 |
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187 | for (i = 0; i < ARRAY_SIZE(raid2); i++) {
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188 | if (raid2[i](id /*,off*/) == 0)
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189 | goto ret;
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190 | if (id->error)
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191 | goto ret;
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192 | }
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193 |
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194 | /* signature in the first block, only small buffer needed */
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195 | for (i = 0; i < ARRAY_SIZE(fs1); i++) {
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196 | if (fs1[i](id /*,off*/) == 0)
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197 | goto ret;
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198 | if (id->error)
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199 | goto ret;
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200 | }
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201 |
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202 | /* fill buffer with maximum */
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203 | volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
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204 |
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205 | for (i = 0; i < ARRAY_SIZE(fs2); i++) {
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206 | if (fs2[i](id /*,off*/) == 0)
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207 | goto ret;
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208 | if (id->error)
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209 | goto ret;
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210 | }
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211 |
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212 | ret:
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213 | volume_id_free_buffer(id);
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214 | return (- id->error); /* 0 or -1 */
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215 | }
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216 |
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217 | /* open volume by device node */
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218 | struct volume_id* FAST_FUNC volume_id_open_node(int fd)
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219 | {
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220 | struct volume_id *id;
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221 |
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222 | id = xzalloc(sizeof(struct volume_id));
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223 | id->fd = fd;
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224 | ///* close fd on device close */
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225 | //id->fd_close = 1;
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226 | return id;
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227 | }
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228 |
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229 | #ifdef UNUSED
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230 | /* open volume by major/minor */
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231 | struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
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232 | {
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233 | struct volume_id *id;
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234 | char *tmp_node[VOLUME_ID_PATH_MAX];
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235 |
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236 | tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
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237 | (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
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238 |
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239 | /* create temporary node to open block device */
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240 | unlink(tmp_node);
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241 | if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
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242 | bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
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243 |
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244 | id = volume_id_open_node(tmp_node);
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245 | unlink(tmp_node);
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246 | free(tmp_node);
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247 | return id;
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248 | }
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249 | #endif
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250 |
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251 | void FAST_FUNC free_volume_id(struct volume_id *id)
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252 | {
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253 | if (id == NULL)
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254 | return;
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255 |
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256 | //if (id->fd_close != 0) - always true
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257 | close(id->fd);
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258 | volume_id_free_buffer(id);
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259 | #ifdef UNUSED_PARTITION_CODE
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260 | free(id->partitions);
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261 | #endif
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262 | free(id);
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263 | }
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