1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * probe.c - identify a block device by its contents, and return a dev
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4 | * struct with the details
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5 | *
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6 | * Copyright (C) 1999 by Andries Brouwer
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7 | * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
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8 | * Copyright (C) 2001 by Andreas Dilger
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9 | *
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10 | * %Begin-Header%
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11 | * This file may be redistributed under the terms of the
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12 | * GNU Lesser General Public License.
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13 | * %End-Header%
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14 | */
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15 |
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16 | #include <stdio.h>
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17 | #include <string.h>
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18 | #include <stdlib.h>
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19 | #include <unistd.h>
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20 | #include <fcntl.h>
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21 | #include <sys/types.h>
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22 | #ifdef HAVE_SYS_STAT_H
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23 | #include <sys/stat.h>
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24 | #endif
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25 | #ifdef HAVE_SYS_MKDEV_H
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26 | #include <sys/mkdev.h>
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27 | #endif
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28 | #ifdef HAVE_ERRNO_H
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29 | #include <errno.h>
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30 | #endif
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31 | #include "blkidP.h"
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32 | #include "../uuid/uuid.h"
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33 | #include "probe.h"
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34 |
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35 | /*
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36 | * This is a special case code to check for an MDRAID device. We do
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37 | * this special since it requires checking for a superblock at the end
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38 | * of the device.
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39 | */
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40 | static int check_mdraid(int fd, unsigned char *ret_uuid)
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41 | {
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42 | struct mdp_superblock_s *md;
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43 | blkid_loff_t offset;
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44 | char buf[4096];
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45 |
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46 | if (fd < 0)
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47 | return -BLKID_ERR_PARAM;
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48 |
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49 | offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536;
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50 |
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51 | if (blkid_llseek(fd, offset, 0) < 0 ||
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52 | read(fd, buf, 4096) != 4096)
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53 | return -BLKID_ERR_IO;
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54 |
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55 | /* Check for magic number */
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56 | if (memcmp("\251+N\374", buf, 4))
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57 | return -BLKID_ERR_PARAM;
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58 |
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59 | if (!ret_uuid)
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60 | return 0;
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61 | *ret_uuid = 0;
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62 |
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63 | /* The MD UUID is not contiguous in the superblock, make it so */
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64 | md = (struct mdp_superblock_s *)buf;
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65 | if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) {
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66 | memcpy(ret_uuid, &md->set_uuid0, 4);
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67 | memcpy(ret_uuid, &md->set_uuid1, 12);
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68 | }
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69 | return 0;
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70 | }
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71 |
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72 | static void set_uuid(blkid_dev dev, uuid_t uuid)
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73 | {
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74 | char str[37];
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75 |
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76 | if (!uuid_is_null(uuid)) {
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77 | uuid_unparse(uuid, str);
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78 | blkid_set_tag(dev, "UUID", str, sizeof(str));
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79 | }
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80 | }
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81 |
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82 | static void get_ext2_info(blkid_dev dev, unsigned char *buf)
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83 | {
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84 | struct ext2_super_block *es = (struct ext2_super_block *) buf;
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85 | const char *label = NULL;
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86 |
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87 | DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n",
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88 | blkid_le32(es->s_feature_compat),
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89 | blkid_le32(es->s_feature_incompat),
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90 | blkid_le32(es->s_feature_ro_compat)));
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91 |
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92 | if (strlen(es->s_volume_name))
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93 | label = es->s_volume_name;
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94 | blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name));
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95 |
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96 | set_uuid(dev, es->s_uuid);
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97 | }
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98 |
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99 | static int probe_ext3(int fd __BLKID_ATTR((unused)),
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100 | blkid_cache cache __BLKID_ATTR((unused)),
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101 | blkid_dev dev,
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102 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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103 | unsigned char *buf)
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104 | {
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105 | struct ext2_super_block *es;
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106 |
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107 | es = (struct ext2_super_block *)buf;
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108 |
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109 | /* Distinguish between jbd and ext2/3 fs */
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110 | if (blkid_le32(es->s_feature_incompat) &
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111 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
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112 | return -BLKID_ERR_PARAM;
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113 |
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114 | /* Distinguish between ext3 and ext2 */
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115 | if (!(blkid_le32(es->s_feature_compat) &
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116 | EXT3_FEATURE_COMPAT_HAS_JOURNAL))
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117 | return -BLKID_ERR_PARAM;
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118 |
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119 | get_ext2_info(dev, buf);
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120 |
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121 | blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2"));
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122 |
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123 | return 0;
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124 | }
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125 |
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126 | static int probe_ext2(int fd __BLKID_ATTR((unused)),
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127 | blkid_cache cache __BLKID_ATTR((unused)),
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128 | blkid_dev dev,
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129 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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130 | unsigned char *buf)
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131 | {
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132 | struct ext2_super_block *es;
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133 |
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134 | es = (struct ext2_super_block *)buf;
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135 |
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136 | /* Distinguish between jbd and ext2/3 fs */
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137 | if (blkid_le32(es->s_feature_incompat) &
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138 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
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139 | return -BLKID_ERR_PARAM;
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140 |
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141 | get_ext2_info(dev, buf);
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142 |
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143 | return 0;
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144 | }
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145 |
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146 | static int probe_jbd(int fd __BLKID_ATTR((unused)),
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147 | blkid_cache cache __BLKID_ATTR((unused)),
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148 | blkid_dev dev,
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149 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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150 | unsigned char *buf)
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151 | {
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152 | struct ext2_super_block *es = (struct ext2_super_block *) buf;
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153 |
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154 | if (!(blkid_le32(es->s_feature_incompat) &
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155 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV))
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156 | return -BLKID_ERR_PARAM;
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157 |
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158 | get_ext2_info(dev, buf);
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159 |
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160 | return 0;
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161 | }
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162 |
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163 | static int probe_vfat(int fd __BLKID_ATTR((unused)),
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164 | blkid_cache cache __BLKID_ATTR((unused)),
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165 | blkid_dev dev,
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166 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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167 | unsigned char *buf)
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168 | {
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169 | struct vfat_super_block *vs;
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170 | char serno[10];
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171 | const char *label = NULL;
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172 | int label_len = 0;
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173 |
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174 | vs = (struct vfat_super_block *)buf;
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175 |
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176 | if (strncmp(vs->vs_label, "NO NAME", 7)) {
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177 | char *end = vs->vs_label + sizeof(vs->vs_label) - 1;
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178 |
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179 | while (*end == ' ' && end >= vs->vs_label)
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180 | --end;
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181 | if (end >= vs->vs_label) {
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182 | label = vs->vs_label;
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183 | label_len = end - vs->vs_label + 1;
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184 | }
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185 | }
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186 |
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187 | /* We can't just print them as %04X, because they are unaligned */
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188 | sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2],
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189 | vs->vs_serno[1], vs->vs_serno[0]);
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190 | blkid_set_tag(dev, "LABEL", label, label_len);
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191 | blkid_set_tag(dev, "UUID", serno, sizeof(serno));
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192 |
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193 | return 0;
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194 | }
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195 |
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196 | static int probe_msdos(int fd __BLKID_ATTR((unused)),
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197 | blkid_cache cache __BLKID_ATTR((unused)),
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198 | blkid_dev dev,
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199 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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200 | unsigned char *buf)
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201 | {
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202 | struct msdos_super_block *ms = (struct msdos_super_block *) buf;
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203 | char serno[10];
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204 | const char *label = NULL;
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205 | int label_len = 0;
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206 |
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207 | if (strncmp(ms->ms_label, "NO NAME", 7)) {
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208 | char *end = ms->ms_label + sizeof(ms->ms_label) - 1;
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209 |
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210 | while (*end == ' ' && end >= ms->ms_label)
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211 | --end;
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212 | if (end >= ms->ms_label) {
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213 | label = ms->ms_label;
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214 | label_len = end - ms->ms_label + 1;
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215 | }
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216 | }
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217 |
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218 | /* We can't just print them as %04X, because they are unaligned */
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219 | sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2],
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220 | ms->ms_serno[1], ms->ms_serno[0]);
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221 | blkid_set_tag(dev, "UUID", serno, 0);
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222 | blkid_set_tag(dev, "LABEL", label, label_len);
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223 | blkid_set_tag(dev, "SEC_TYPE", "msdos", sizeof("msdos"));
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224 |
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225 | return 0;
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226 | }
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227 |
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228 | static int probe_xfs(int fd __BLKID_ATTR((unused)),
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229 | blkid_cache cache __BLKID_ATTR((unused)),
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230 | blkid_dev dev,
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231 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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232 | unsigned char *buf)
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233 | {
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234 | struct xfs_super_block *xs;
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235 | const char *label = NULL;
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236 |
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237 | xs = (struct xfs_super_block *)buf;
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238 |
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239 | if (strlen(xs->xs_fname))
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240 | label = xs->xs_fname;
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241 | blkid_set_tag(dev, "LABEL", label, sizeof(xs->xs_fname));
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242 | set_uuid(dev, xs->xs_uuid);
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243 | return 0;
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244 | }
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245 |
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246 | static int probe_reiserfs(int fd __BLKID_ATTR((unused)),
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247 | blkid_cache cache __BLKID_ATTR((unused)),
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248 | blkid_dev dev,
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249 | const struct blkid_magic *id, unsigned char *buf)
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250 | {
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251 | struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf;
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252 | unsigned int blocksize;
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253 | const char *label = NULL;
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254 |
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255 | blocksize = blkid_le16(rs->rs_blocksize);
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256 |
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257 | /* If the superblock is inside the journal, we have the wrong one */
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258 | if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block))
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259 | return -BLKID_ERR_BIG;
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260 |
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261 | /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */
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262 | if (!strcmp(id->bim_magic, "ReIsEr2Fs") ||
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263 | !strcmp(id->bim_magic, "ReIsEr3Fs")) {
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264 | if (strlen(rs->rs_label))
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265 | label = rs->rs_label;
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266 | set_uuid(dev, rs->rs_uuid);
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267 | }
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268 | blkid_set_tag(dev, "LABEL", label, sizeof(rs->rs_label));
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269 |
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270 | return 0;
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271 | }
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272 |
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273 | static int probe_jfs(int fd __BLKID_ATTR((unused)),
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274 | blkid_cache cache __BLKID_ATTR((unused)),
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275 | blkid_dev dev,
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276 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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277 | unsigned char *buf)
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278 | {
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279 | struct jfs_super_block *js;
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280 | const char *label = NULL;
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281 |
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282 | js = (struct jfs_super_block *)buf;
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283 |
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284 | if (strlen((char *) js->js_label))
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285 | label = (char *) js->js_label;
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286 | blkid_set_tag(dev, "LABEL", label, sizeof(js->js_label));
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287 | set_uuid(dev, js->js_uuid);
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288 | return 0;
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289 | }
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290 |
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291 | static int probe_romfs(int fd __BLKID_ATTR((unused)),
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292 | blkid_cache cache __BLKID_ATTR((unused)),
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293 | blkid_dev dev,
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294 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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295 | unsigned char *buf)
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296 | {
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297 | struct romfs_super_block *ros;
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298 | const char *label = NULL;
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299 |
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300 | ros = (struct romfs_super_block *)buf;
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301 |
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302 | if (strlen((char *) ros->ros_volume))
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303 | label = (char *) ros->ros_volume;
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304 | blkid_set_tag(dev, "LABEL", label, 0);
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305 | return 0;
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306 | }
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307 |
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308 | static int probe_cramfs(int fd __BLKID_ATTR((unused)),
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309 | blkid_cache cache __BLKID_ATTR((unused)),
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310 | blkid_dev dev,
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311 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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312 | unsigned char *buf)
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313 | {
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314 | struct cramfs_super_block *csb;
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315 | const char *label = NULL;
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316 |
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317 | csb = (struct cramfs_super_block *)buf;
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318 |
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319 | if (strlen((char *) csb->name))
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320 | label = (char *) csb->name;
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321 | blkid_set_tag(dev, "LABEL", label, 0);
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322 | return 0;
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323 | }
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324 |
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325 | static int probe_swap0(int fd __BLKID_ATTR((unused)),
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326 | blkid_cache cache __BLKID_ATTR((unused)),
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327 | blkid_dev dev,
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328 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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329 | unsigned char *buf __BLKID_ATTR((unused)))
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330 | {
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331 | blkid_set_tag(dev, "UUID", 0, 0);
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332 | blkid_set_tag(dev, "LABEL", 0, 0);
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333 | return 0;
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334 | }
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335 |
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336 | static int probe_swap1(int fd,
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337 | blkid_cache cache __BLKID_ATTR((unused)),
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338 | blkid_dev dev,
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339 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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340 | unsigned char *buf __BLKID_ATTR((unused)))
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341 | {
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342 | struct swap_id_block *sws;
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343 |
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344 | probe_swap0(fd, cache, dev, id, buf);
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345 | /*
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346 | * Version 1 swap headers are always located at offset of 1024
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347 | * bytes, although the swap signature itself is located at the
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348 | * end of the page (which may vary depending on hardware
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349 | * pagesize).
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350 | */
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351 | if (lseek(fd, 1024, SEEK_SET) < 0) return 1;
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352 | sws = xmalloc(1024);
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353 | if (read(fd, sws, 1024) != 1024) {
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354 | free(sws);
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355 | return 1;
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356 | }
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357 |
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358 | /* arbitrary sanity check.. is there any garbage down there? */
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359 | if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) {
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360 | if (sws->sws_volume[0])
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361 | blkid_set_tag(dev, "LABEL", (const char*)sws->sws_volume,
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362 | sizeof(sws->sws_volume));
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363 | if (sws->sws_uuid[0])
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364 | set_uuid(dev, sws->sws_uuid);
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365 | }
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366 | free(sws);
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367 |
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368 | return 0;
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369 | }
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370 |
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371 | static const char
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372 | * const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02",
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373 | "NSR03", "TEA01", 0 };
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374 |
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375 | static int probe_udf(int fd, blkid_cache cache __BLKID_ATTR((unused)),
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376 | blkid_dev dev __BLKID_ATTR((unused)),
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377 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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378 | unsigned char *buf __BLKID_ATTR((unused)))
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379 | {
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380 | int j, bs;
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381 | struct iso_volume_descriptor isosb;
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382 | const char *const *m;
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383 |
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384 | /* determine the block size by scanning in 2K increments
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385 | (block sizes larger than 2K will be null padded) */
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386 | for (bs = 1; bs < 16; bs++) {
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387 | lseek(fd, bs*2048+32768, SEEK_SET);
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388 | if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb))
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389 | return 1;
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390 | if (isosb.id[0])
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391 | break;
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392 | }
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393 |
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394 | /* Scan up to another 64 blocks looking for additional VSD's */
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395 | for (j = 1; j < 64; j++) {
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396 | if (j > 1) {
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397 | lseek(fd, j*bs*2048+32768, SEEK_SET);
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398 | if (read(fd, (char *)&isosb, sizeof(isosb))
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399 | != sizeof(isosb))
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400 | return 1;
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401 | }
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402 | /* If we find NSR0x then call it udf:
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403 | NSR01 for UDF 1.00
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404 | NSR02 for UDF 1.50
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405 | NSR03 for UDF 2.00 */
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406 | if (!strncmp(isosb.id, "NSR0", 4))
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407 | return 0;
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408 | for (m = udf_magic; *m; m++)
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409 | if (!strncmp(*m, isosb.id, 5))
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410 | break;
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411 | if (*m == 0)
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412 | return 1;
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413 | }
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414 | return 1;
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415 | }
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416 |
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417 | static int probe_ocfs(int fd __BLKID_ATTR((unused)),
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418 | blkid_cache cache __BLKID_ATTR((unused)),
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419 | blkid_dev dev,
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420 | const struct blkid_magic *id __BLKID_ATTR((unused)),
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421 | unsigned char *buf)
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422 | {
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423 | struct ocfs_volume_header ovh;
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424 | struct ocfs_volume_label ovl;
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425 | __u32 major;
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426 |
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427 | memcpy(&ovh, buf, sizeof(ovh));
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428 | memcpy(&ovl, buf+512, sizeof(ovl));
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429 |
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430 | major = ocfsmajor(ovh);
|
---|
431 | if (major == 1)
|
---|
432 | blkid_set_tag(dev, "SEC_TYPE", "ocfs1", sizeof("ocfs1"));
|
---|
433 | else if (major >= 9)
|
---|
434 | blkid_set_tag(dev, "SEC_TYPE", "ntocfs", sizeof("ntocfs"));
|
---|
435 |
|
---|
436 | blkid_set_tag(dev, "LABEL", (const char*)ovl.label, ocfslabellen(ovl));
|
---|
437 | blkid_set_tag(dev, "MOUNT", (const char*)ovh.mount, ocfsmountlen(ovh));
|
---|
438 | set_uuid(dev, ovl.vol_id);
|
---|
439 | return 0;
|
---|
440 | }
|
---|
441 |
|
---|
442 | static int probe_ocfs2(int fd __BLKID_ATTR((unused)),
|
---|
443 | blkid_cache cache __BLKID_ATTR((unused)),
|
---|
444 | blkid_dev dev,
|
---|
445 | const struct blkid_magic *id __BLKID_ATTR((unused)),
|
---|
446 | unsigned char *buf)
|
---|
447 | {
|
---|
448 | struct ocfs2_super_block *osb;
|
---|
449 |
|
---|
450 | osb = (struct ocfs2_super_block *)buf;
|
---|
451 |
|
---|
452 | blkid_set_tag(dev, "LABEL", (const char*)osb->s_label, sizeof(osb->s_label));
|
---|
453 | set_uuid(dev, osb->s_uuid);
|
---|
454 | return 0;
|
---|
455 | }
|
---|
456 |
|
---|
457 | static int probe_oracleasm(int fd __BLKID_ATTR((unused)),
|
---|
458 | blkid_cache cache __BLKID_ATTR((unused)),
|
---|
459 | blkid_dev dev,
|
---|
460 | const struct blkid_magic *id __BLKID_ATTR((unused)),
|
---|
461 | unsigned char *buf)
|
---|
462 | {
|
---|
463 | struct oracle_asm_disk_label *dl;
|
---|
464 |
|
---|
465 | dl = (struct oracle_asm_disk_label *)buf;
|
---|
466 |
|
---|
467 | blkid_set_tag(dev, "LABEL", dl->dl_id, sizeof(dl->dl_id));
|
---|
468 | return 0;
|
---|
469 | }
|
---|
470 |
|
---|
471 | /*
|
---|
472 | * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined
|
---|
473 | * in the type_array table below + bim_kbalign.
|
---|
474 | *
|
---|
475 | * When probing for a lot of magics, we handle everything in 1kB buffers so
|
---|
476 | * that we don't have to worry about reading each combination of block sizes.
|
---|
477 | */
|
---|
478 | #define BLKID_BLK_OFFS 64 /* currently reiserfs */
|
---|
479 |
|
---|
480 | /*
|
---|
481 | * Various filesystem magics that we can check for. Note that kboff and
|
---|
482 | * sboff are in kilobytes and bytes respectively. All magics are in
|
---|
483 | * byte strings so we don't worry about endian issues.
|
---|
484 | */
|
---|
485 | static const struct blkid_magic type_array[] = {
|
---|
486 | /* type kboff sboff len magic probe */
|
---|
487 | { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm },
|
---|
488 | { "ntfs", 0, 3, 8, "NTFS ", 0 },
|
---|
489 | { "jbd", 1, 0x38, 2, "\123\357", probe_jbd },
|
---|
490 | { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 },
|
---|
491 | { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 },
|
---|
492 | { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs },
|
---|
493 | { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs },
|
---|
494 | { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs },
|
---|
495 | { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs },
|
---|
496 | { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs },
|
---|
497 | { "vfat", 0, 0x52, 5, "MSWIN", probe_vfat },
|
---|
498 | { "vfat", 0, 0x52, 8, "FAT32 ", probe_vfat },
|
---|
499 | { "vfat", 0, 0x36, 5, "MSDOS", probe_msdos },
|
---|
500 | { "vfat", 0, 0x36, 8, "FAT16 ", probe_msdos },
|
---|
501 | { "vfat", 0, 0x36, 8, "FAT12 ", probe_msdos },
|
---|
502 | { "minix", 1, 0x10, 2, "\177\023", 0 },
|
---|
503 | { "minix", 1, 0x10, 2, "\217\023", 0 },
|
---|
504 | { "minix", 1, 0x10, 2, "\150\044", 0 },
|
---|
505 | { "minix", 1, 0x10, 2, "\170\044", 0 },
|
---|
506 | { "vxfs", 1, 0, 4, "\365\374\001\245", 0 },
|
---|
507 | { "xfs", 0, 0, 4, "XFSB", probe_xfs },
|
---|
508 | { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs },
|
---|
509 | { "bfs", 0, 0, 4, "\316\372\173\033", 0 },
|
---|
510 | { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs },
|
---|
511 | { "qnx4", 0, 4, 6, "QNX4FS", 0 },
|
---|
512 | { "udf", 32, 1, 5, "BEA01", probe_udf },
|
---|
513 | { "udf", 32, 1, 5, "BOOT2", probe_udf },
|
---|
514 | { "udf", 32, 1, 5, "CD001", probe_udf },
|
---|
515 | { "udf", 32, 1, 5, "CDW02", probe_udf },
|
---|
516 | { "udf", 32, 1, 5, "NSR02", probe_udf },
|
---|
517 | { "udf", 32, 1, 5, "NSR03", probe_udf },
|
---|
518 | { "udf", 32, 1, 5, "TEA01", probe_udf },
|
---|
519 | { "iso9660", 32, 1, 5, "CD001", 0 },
|
---|
520 | { "iso9660", 32, 9, 5, "CDROM", 0 },
|
---|
521 | { "jfs", 32, 0, 4, "JFS1", probe_jfs },
|
---|
522 | { "hfs", 1, 0, 2, "BD", 0 },
|
---|
523 | { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 },
|
---|
524 | { "hpfs", 8, 0, 4, "I\350\225\371", 0 },
|
---|
525 | { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 },
|
---|
526 | { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
527 | { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
528 | { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
529 | { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
530 | { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
531 | { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
532 | { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
533 | { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
534 | { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 },
|
---|
535 | { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 },
|
---|
536 | { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs },
|
---|
537 | { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
538 | { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
539 | { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
540 | { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 },
|
---|
541 | { NULL, 0, 0, 0, NULL, NULL }
|
---|
542 | };
|
---|
543 |
|
---|
544 | /*
|
---|
545 | * Verify that the data in dev is consistent with what is on the actual
|
---|
546 | * block device (using the devname field only). Normally this will be
|
---|
547 | * called when finding items in the cache, but for long running processes
|
---|
548 | * is also desirable to revalidate an item before use.
|
---|
549 | *
|
---|
550 | * If we are unable to revalidate the data, we return the old data and
|
---|
551 | * do not set the BLKID_BID_FL_VERIFIED flag on it.
|
---|
552 | */
|
---|
553 | blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
|
---|
554 | {
|
---|
555 | const struct blkid_magic *id;
|
---|
556 | unsigned char *bufs[BLKID_BLK_OFFS + 1], *buf;
|
---|
557 | const char *type;
|
---|
558 | struct stat st;
|
---|
559 | time_t diff, now;
|
---|
560 | int fd, idx;
|
---|
561 |
|
---|
562 | if (!dev)
|
---|
563 | return NULL;
|
---|
564 |
|
---|
565 | now = time(NULL);
|
---|
566 | diff = now - dev->bid_time;
|
---|
567 |
|
---|
568 | if ((now < dev->bid_time) ||
|
---|
569 | (diff < BLKID_PROBE_MIN) ||
|
---|
570 | (dev->bid_flags & BLKID_BID_FL_VERIFIED &&
|
---|
571 | diff < BLKID_PROBE_INTERVAL))
|
---|
572 | return dev;
|
---|
573 |
|
---|
574 | DBG(DEBUG_PROBE,
|
---|
575 | printf("need to revalidate %s (time since last check %lu)\n",
|
---|
576 | dev->bid_name, diff));
|
---|
577 |
|
---|
578 | fd = open(dev->bid_name, O_RDONLY);
|
---|
579 | if (fd < 0
|
---|
580 | || fstat(fd, &st) < 0
|
---|
581 | ) {
|
---|
582 | if (fd >= 0)
|
---|
583 | close(fd);
|
---|
584 | if (errno == ENXIO || errno == ENODEV || errno == ENOENT) {
|
---|
585 | blkid_free_dev(dev);
|
---|
586 | return NULL;
|
---|
587 | }
|
---|
588 | /* We don't have read permission, just return cache data. */
|
---|
589 | DBG(DEBUG_PROBE,
|
---|
590 | printf("returning unverified data for %s\n",
|
---|
591 | dev->bid_name));
|
---|
592 | return dev;
|
---|
593 | }
|
---|
594 |
|
---|
595 | memset(bufs, 0, sizeof(bufs));
|
---|
596 |
|
---|
597 | /*
|
---|
598 | * Iterate over the type array. If we already know the type,
|
---|
599 | * then try that first. If it doesn't work, then blow away
|
---|
600 | * the type information, and try again.
|
---|
601 | *
|
---|
602 | */
|
---|
603 | try_again:
|
---|
604 | type = 0;
|
---|
605 | if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) {
|
---|
606 | uuid_t uuid;
|
---|
607 |
|
---|
608 | if (check_mdraid(fd, uuid) == 0) {
|
---|
609 | set_uuid(dev, uuid);
|
---|
610 | type = "mdraid";
|
---|
611 | goto found_type;
|
---|
612 | }
|
---|
613 | }
|
---|
614 | for (id = type_array; id->bim_type; id++) {
|
---|
615 | if (dev->bid_type &&
|
---|
616 | strcmp(id->bim_type, dev->bid_type))
|
---|
617 | continue;
|
---|
618 |
|
---|
619 | idx = id->bim_kboff + (id->bim_sboff >> 10);
|
---|
620 | if (idx > BLKID_BLK_OFFS || idx < 0)
|
---|
621 | continue;
|
---|
622 | buf = bufs[idx];
|
---|
623 | if (!buf) {
|
---|
624 | if (lseek(fd, idx << 10, SEEK_SET) < 0)
|
---|
625 | continue;
|
---|
626 |
|
---|
627 | buf = xmalloc(1024);
|
---|
628 |
|
---|
629 | if (read(fd, buf, 1024) != 1024) {
|
---|
630 | free(buf);
|
---|
631 | continue;
|
---|
632 | }
|
---|
633 | bufs[idx] = buf;
|
---|
634 | }
|
---|
635 |
|
---|
636 | if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff),
|
---|
637 | id->bim_len))
|
---|
638 | continue;
|
---|
639 |
|
---|
640 | if ((id->bim_probe == NULL) ||
|
---|
641 | (id->bim_probe(fd, cache, dev, id, buf) == 0)) {
|
---|
642 | type = id->bim_type;
|
---|
643 | goto found_type;
|
---|
644 | }
|
---|
645 | }
|
---|
646 |
|
---|
647 | if (!id->bim_type && dev->bid_type) {
|
---|
648 | /*
|
---|
649 | * Zap the device filesystem type and try again
|
---|
650 | */
|
---|
651 | blkid_set_tag(dev, "TYPE", 0, 0);
|
---|
652 | blkid_set_tag(dev, "SEC_TYPE", 0, 0);
|
---|
653 | blkid_set_tag(dev, "LABEL", 0, 0);
|
---|
654 | blkid_set_tag(dev, "UUID", 0, 0);
|
---|
655 | goto try_again;
|
---|
656 | }
|
---|
657 |
|
---|
658 | if (!dev->bid_type) {
|
---|
659 | blkid_free_dev(dev);
|
---|
660 | close(fd);
|
---|
661 | return NULL;
|
---|
662 | }
|
---|
663 |
|
---|
664 | found_type:
|
---|
665 | if (dev && type) {
|
---|
666 | dev->bid_devno = st.st_rdev;
|
---|
667 | dev->bid_time = time(NULL);
|
---|
668 | dev->bid_flags |= BLKID_BID_FL_VERIFIED;
|
---|
669 | cache->bic_flags |= BLKID_BIC_FL_CHANGED;
|
---|
670 |
|
---|
671 | blkid_set_tag(dev, "TYPE", type, 0);
|
---|
672 |
|
---|
673 | DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n",
|
---|
674 | dev->bid_name, st.st_rdev, type));
|
---|
675 | }
|
---|
676 |
|
---|
677 | close(fd);
|
---|
678 |
|
---|
679 | return dev;
|
---|
680 | }
|
---|
681 |
|
---|
682 | int blkid_known_fstype(const char *fstype)
|
---|
683 | {
|
---|
684 | const struct blkid_magic *id;
|
---|
685 |
|
---|
686 | for (id = type_array; id->bim_type; id++) {
|
---|
687 | if (strcmp(fstype, id->bim_type) == 0)
|
---|
688 | return 1;
|
---|
689 | }
|
---|
690 | return 0;
|
---|
691 | }
|
---|
692 |
|
---|
693 | #ifdef TEST_PROGRAM
|
---|
694 | int main(int argc, char **argv)
|
---|
695 | {
|
---|
696 | blkid_dev dev;
|
---|
697 | blkid_cache cache;
|
---|
698 | int ret;
|
---|
699 |
|
---|
700 | blkid_debug_mask = DEBUG_ALL;
|
---|
701 | if (argc != 2) {
|
---|
702 | fprintf(stderr, "Usage: %s device\n"
|
---|
703 | "Probe a single device to determine type\n", argv[0]);
|
---|
704 | exit(1);
|
---|
705 | }
|
---|
706 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
|
---|
707 | fprintf(stderr, "%s: error creating cache (%d)\n",
|
---|
708 | argv[0], ret);
|
---|
709 | exit(1);
|
---|
710 | }
|
---|
711 | dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL);
|
---|
712 | if (!dev) {
|
---|
713 | printf("%s: %s has an unsupported type\n", argv[0], argv[1]);
|
---|
714 | return 1;
|
---|
715 | }
|
---|
716 | printf("%s is type %s\n", argv[1], dev->bid_type ?
|
---|
717 | dev->bid_type : "(null)");
|
---|
718 | if (dev->bid_label)
|
---|
719 | printf("\tlabel is '%s'\n", dev->bid_label);
|
---|
720 | if (dev->bid_uuid)
|
---|
721 | printf("\tuuid is %s\n", dev->bid_uuid);
|
---|
722 |
|
---|
723 | blkid_free_dev(dev);
|
---|
724 | return 0;
|
---|
725 | }
|
---|
726 | #endif
|
---|