1 | #if ENABLE_FEATURE_GPT_LABEL
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2 | /*
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3 | * Copyright (C) 2010 Kevin Cernekee <cernekee@gmail.com>
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4 | *
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5 | * Licensed under GPLv2, see file LICENSE in this source tree.
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6 | */
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7 |
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8 | #define GPT_MAGIC 0x5452415020494645ULL
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9 | enum {
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10 | LEGACY_GPT_TYPE = 0xee,
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11 | GPT_MAX_PARTS = 256,
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12 | GPT_MAX_PART_ENTRY_LEN = 4096,
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13 | GUID_LEN = 16,
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14 | };
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15 |
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16 | typedef struct {
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17 | uint64_t magic;
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18 | uint32_t revision;
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19 | uint32_t hdr_size;
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20 | uint32_t hdr_crc32;
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21 | uint32_t reserved;
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22 | uint64_t current_lba;
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23 | uint64_t backup_lba;
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24 | uint64_t first_usable_lba;
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25 | uint64_t last_usable_lba;
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26 | uint8_t disk_guid[GUID_LEN];
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27 | uint64_t first_part_lba;
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28 | uint32_t n_parts;
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29 | uint32_t part_entry_len;
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30 | uint32_t part_array_crc32;
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31 | } gpt_header;
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32 |
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33 | typedef struct {
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34 | uint8_t type_guid[GUID_LEN];
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35 | uint8_t part_guid[GUID_LEN];
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36 | uint64_t lba_start;
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37 | uint64_t lba_end;
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38 | uint64_t flags;
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39 | uint16_t name[36];
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40 | } gpt_partition;
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41 |
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42 | static gpt_header *gpt_hdr;
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43 |
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44 | static char *part_array;
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45 | static unsigned int n_parts;
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46 | static unsigned int part_array_len;
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47 | static unsigned int part_entry_len;
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48 |
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49 | static inline gpt_partition *
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50 | gpt_part(int i)
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51 | {
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52 | if (i >= n_parts) {
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53 | return NULL;
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54 | }
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55 | return (gpt_partition *)&part_array[i * part_entry_len];
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56 | }
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57 |
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58 | static uint32_t
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59 | gpt_crc32(void *buf, int len)
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60 | {
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61 | return ~crc32_block_endian0(0xffffffff, buf, len, global_crc32_table);
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62 | }
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63 |
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64 | static void
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65 | gpt_print_guid(uint8_t *buf)
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66 | {
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67 | printf(
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68 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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69 | buf[3], buf[2], buf[1], buf[0],
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70 | buf[5], buf[4],
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71 | buf[7], buf[6],
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72 | buf[8], buf[9],
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73 | buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
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74 | }
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75 |
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76 | /* TODO: real unicode support */
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77 | static void
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78 | gpt_print_wide(uint16_t *s, int max_len)
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79 | {
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80 | int i = 0;
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81 |
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82 | while (i < max_len) {
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83 | if (*s == 0)
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84 | return;
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85 | fputc(*s, stdout);
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86 | s++;
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87 | }
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88 | }
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89 |
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90 | static void
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91 | gpt_list_table(int xtra UNUSED_PARAM)
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92 | {
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93 | int i;
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94 | char numstr6[6];
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95 |
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96 | numstr6[5] = '\0';
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97 |
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98 | smart_ulltoa5(total_number_of_sectors, numstr6, " KMGTPEZY");
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99 | printf("Disk %s: %llu sectors, %s\n", disk_device,
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100 | (unsigned long long)total_number_of_sectors,
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101 | numstr6);
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102 | printf("Logical sector size: %u\n", sector_size);
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103 | printf("Disk identifier (GUID): ");
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104 | gpt_print_guid(gpt_hdr->disk_guid);
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105 | printf("\nPartition table holds up to %u entries\n",
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106 | (int)SWAP_LE32(gpt_hdr->n_parts));
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107 | printf("First usable sector is %llu, last usable sector is %llu\n\n",
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108 | (unsigned long long)SWAP_LE64(gpt_hdr->first_usable_lba),
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109 | (unsigned long long)SWAP_LE64(gpt_hdr->last_usable_lba));
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110 |
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111 | printf("Number Start (sector) End (sector) Size Code Name\n");
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112 | for (i = 0; i < n_parts; i++) {
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113 | gpt_partition *p = gpt_part(i);
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114 | if (p->lba_start) {
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115 | smart_ulltoa5(1 + SWAP_LE64(p->lba_end) - SWAP_LE64(p->lba_start),
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116 | numstr6, " KMGTPEZY");
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117 | printf("%4u %15llu %15llu %11s %04x ",
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118 | i + 1,
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119 | (unsigned long long)SWAP_LE64(p->lba_start),
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120 | (unsigned long long)SWAP_LE64(p->lba_end),
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121 | numstr6,
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122 | 0x0700 /* FIXME */);
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123 | gpt_print_wide(p->name, 18);
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124 | printf("\n");
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125 | }
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126 | }
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127 | }
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128 |
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129 | static int
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130 | check_gpt_label(void)
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131 | {
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132 | struct partition *first = pt_offset(MBRbuffer, 0);
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133 | struct pte pe;
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134 | uint32_t crc;
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135 |
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136 | /* LBA 0 contains the legacy MBR */
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137 |
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138 | if (!valid_part_table_flag(MBRbuffer)
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139 | || first->sys_ind != LEGACY_GPT_TYPE
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140 | ) {
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141 | current_label_type = 0;
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142 | return 0;
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143 | }
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144 |
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145 | /* LBA 1 contains the GPT header */
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146 |
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147 | read_pte(&pe, 1);
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148 | gpt_hdr = (void *)pe.sectorbuffer;
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149 |
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150 | if (gpt_hdr->magic != SWAP_LE64(GPT_MAGIC)) {
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151 | current_label_type = 0;
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152 | return 0;
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153 | }
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154 |
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155 | if (!global_crc32_table) {
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156 | global_crc32_table = crc32_filltable(NULL, 0);
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157 | }
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158 |
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159 | crc = SWAP_LE32(gpt_hdr->hdr_crc32);
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160 | gpt_hdr->hdr_crc32 = 0;
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161 | if (gpt_crc32(gpt_hdr, SWAP_LE32(gpt_hdr->hdr_size)) != crc) {
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162 | /* FIXME: read the backup table */
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163 | puts("\nwarning: GPT header CRC is invalid\n");
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164 | }
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165 |
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166 | n_parts = SWAP_LE32(gpt_hdr->n_parts);
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167 | part_entry_len = SWAP_LE32(gpt_hdr->part_entry_len);
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168 | if (n_parts > GPT_MAX_PARTS
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169 | || part_entry_len > GPT_MAX_PART_ENTRY_LEN
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170 | || SWAP_LE32(gpt_hdr->hdr_size) > sector_size
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171 | ) {
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172 | puts("\nwarning: unable to parse GPT disklabel\n");
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173 | current_label_type = 0;
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174 | return 0;
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175 | }
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176 |
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177 | part_array_len = n_parts * part_entry_len;
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178 | part_array = xmalloc(part_array_len);
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179 | seek_sector(SWAP_LE64(gpt_hdr->first_part_lba));
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180 | if (full_read(dev_fd, part_array, part_array_len) != part_array_len) {
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181 | fdisk_fatal(unable_to_read);
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182 | }
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183 |
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184 | if (gpt_crc32(part_array, part_array_len) != gpt_hdr->part_array_crc32) {
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185 | /* FIXME: read the backup table */
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186 | puts("\nwarning: GPT array CRC is invalid\n");
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187 | }
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188 |
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189 | puts("Found valid GPT with protective MBR; using GPT\n");
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190 |
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191 | current_label_type = LABEL_GPT;
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192 | return 1;
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193 | }
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194 |
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195 | #endif /* GPT_LABEL */
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