[3320] | 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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