/* * Copyright (C) 2007 Karel Zak * Copyright (C) 2012 Davidlohr Bueso * * GUID Partition Table (GPT) support. Based on UEFI Specs 2.3.1 * Chapter 5: GUID Partition Table (GPT) Disk Layout (Jun 27th, 2012). * Some ideas and inspiration from GNU parted and gptfdisk. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include "nls.h" #include "xalloc.h" #include "common.h" #include "fdisk.h" #include "crc32.h" #include "gpt.h" #include "blkdev.h" #include "bitops.h" #include "strutils.h" #include "all-io.h" #define GPT_HEADER_SIGNATURE 0x5452415020494645LL /* EFI PART */ #define GPT_HEADER_REVISION_V1_02 0x00010200 #define GPT_HEADER_REVISION_V1_00 0x00010000 #define GPT_HEADER_REVISION_V0_99 0x00009900 #define GPT_HEADER_MINSZ 92 /* bytes */ #define GPT_PMBR_LBA 0 #define GPT_MBR_PROTECTIVE 1 #define GPT_MBR_HYBRID 2 #define GPT_PRIMARY_PARTITION_TABLE_LBA 0x00000001 #define EFI_PMBR_OSTYPE 0xEE #define MSDOS_MBR_SIGNATURE 0xAA55 #define GPT_PART_NAME_LEN 72 / sizeof(uint16_t) #define GPT_NPARTITIONS 128 /* Globally unique identifier */ struct gpt_guid { uint32_t time_low; uint16_t time_mid; uint16_t time_hi_and_version; uint8_t clock_seq_hi; uint8_t clock_seq_low; uint8_t node[6]; }; /* only checking that the GUID is 0 is enough to verify an empty partition. */ #define GPT_UNUSED_ENTRY_GUID \ ((struct gpt_guid) { 0x00000000, 0x0000, 0x0000, 0x00, 0x00, \ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }}) /* Linux native partition type */ #define GPT_DEFAULT_ENTRY_GUID \ ((struct gpt_guid) { 0x0FC63DAF, 0x8483, 0x4772, 0x8E, 0x79, \ { 0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4 }}) /* * Attribute bits */ struct gpt_attr { uint64_t required_to_function:1; uint64_t no_blockio_protocol:1; uint64_t legacy_bios_bootable:1; uint64_t reserved:45; uint64_t guid_secific:16; } __attribute__ ((packed)); /* The GPT Partition entry array contains an array of GPT entries. */ struct gpt_entry { struct gpt_guid partition_type_guid; /* purpose and type of the partition */ struct gpt_guid unique_partition_guid; uint64_t lba_start; uint64_t lba_end; struct gpt_attr attr; uint16_t partition_name[GPT_PART_NAME_LEN]; } __attribute__ ((packed)); /* GPT header */ struct gpt_header { uint64_t signature; /* header identification */ uint32_t revision; /* header version */ uint32_t size; /* in bytes */ uint32_t crc32; /* header CRC checksum */ uint32_t reserved1; /* must be 0 */ uint64_t my_lba; /* LBA that contains this struct (LBA 1) */ uint64_t alternative_lba; /* backup GPT header */ uint64_t first_usable_lba; /* first usable logical block for partitions */ uint64_t last_usable_lba; /* last usable logical block for partitions */ struct gpt_guid disk_guid; /* unique disk identifier */ uint64_t partition_entry_lba; /* stat LBA of the partition entry array */ uint32_t npartition_entries; /* total partition entries - normally 128 */ uint32_t sizeof_partition_entry; /* bytes for each GUID pt */ uint32_t partition_entry_array_crc32; /* partition CRC checksum */ uint8_t reserved2[512 - 92]; /* must be 0 */ } __attribute__ ((packed)); struct gpt_record { uint8_t boot_indicator; /* unused by EFI, set to 0x80 for bootable */ uint8_t start_head; /* unused by EFI, pt start in CHS */ uint8_t start_sector; /* unused by EFI, pt start in CHS */ uint8_t start_track; uint8_t os_type; /* EFI and legacy non-EFI OS types */ uint8_t end_head; /* unused by EFI, pt end in CHS */ uint8_t end_sector; /* unused by EFI, pt end in CHS */ uint8_t end_track; /* unused by EFI, pt end in CHS */ uint32_t starting_lba; /* used by EFI - start addr of the on disk pt */ uint32_t size_in_lba; /* used by EFI - size of pt in LBA */ } __attribute__ ((packed)); /* Protected MBR and legacy MBR share same structure */ struct gpt_legacy_mbr { uint8_t boot_code[440]; uint32_t unique_mbr_signature; uint16_t unknown; struct gpt_record partition_record[4]; uint16_t signature; } __attribute__ ((packed)); /* * Here be dragons! * See: http://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs */ #define DEF_GUID(_u, _n) \ { \ .typestr = (_u), \ .name = (_n), \ } static struct fdisk_parttype gpt_parttypes[] = { /* Generic OS */ DEF_GUID("C12A7328-F81F-11D2-BA4B-00A0C93EC93B", N_("EFI System")), DEF_GUID("024DEE41-33E7-11D3-9D69-0008C781F39F", N_("MBR partition scheme")), /* Hah!IdontneedEFI */ DEF_GUID("21686148-6449-6E6F-744E-656564454649", N_("BIOS boot partition")), /* Windows */ DEF_GUID("E3C9E316-0B5C-4DB8-817D-F92DF00215AE", N_("Microsoft reserved")), DEF_GUID("EBD0A0A2-B9E5-4433-87C0-68B6B72699C7", N_("Microsoft basic data")), DEF_GUID("5808C8AA-7E8F-42E0-85D2-E1E90434CFB3", N_("Microsoft LDM metadata")), DEF_GUID("AF9B60A0-1431-4F62-BC68-3311714A69AD", N_("Microsoft LDM data")), DEF_GUID("DE94BBA4-06D1-4D40-A16A-BFD50179D6AC", N_("Windows recovery evironmnet")), DEF_GUID("37AFFC90-EF7D-4E96-91C3-2D7AE055B174", N_("IBM General Parallel Fs")), /* HP-UX */ DEF_GUID("75894C1E-3AEB-11D3-B7C1-7B03A0000000", N_("HP-UX data partition")), DEF_GUID("E2A1E728-32E3-11D6-A682-7B03A0000000", N_("HP-UX service partition")), /* Linux */ DEF_GUID("0FC63DAF-8483-4772-8E79-3D69D8477DE4", N_("Linux filesystem")), DEF_GUID("A19D880F-05FC-4D3B-A006-743F0F84911E", N_("Linux RAID")), DEF_GUID("0657FD6D-A4AB-43C4-84E5-0933C84B4F4F", N_("Linux swap")), DEF_GUID("E6D6D379-F507-44C2-A23C-238F2A3DF928", N_("Linux LVM")), DEF_GUID("8DA63339-0007-60C0-C436-083AC8230908", N_("Linux reserved")), /* FreeBSD */ DEF_GUID("516E7CB4-6ECF-11D6-8FF8-00022D09712B", N_("FreeBSD data")), DEF_GUID("83BD6B9D-7F41-11DC-BE0B-001560B84F0F", N_("FreeBSD boot")), DEF_GUID("516E7CB5-6ECF-11D6-8FF8-00022D09712B", N_("FreeBSD swap")), DEF_GUID("516E7CB6-6ECF-11D6-8FF8-00022D09712B", N_("FreeBSD UFS")), DEF_GUID("516E7CBA-6ECF-11D6-8FF8-00022D09712B", N_("FreeBSD ZFS")), DEF_GUID("516E7CB8-6ECF-11D6-8FF8-00022D09712B", N_("FreeBSD Vinum")), /* Apple OSX */ DEF_GUID("48465300-0000-11AA-AA11-00306543ECAC", N_("Apple HFS/HFS+")), DEF_GUID("55465300-0000-11AA-AA11-00306543ECAC", N_("Apple UFS")), DEF_GUID("52414944-0000-11AA-AA11-00306543ECAC", N_("Apple RAID")), DEF_GUID("52414944-5F4F-11AA-AA11-00306543ECAC", N_("Apple RAID offline")), DEF_GUID("426F6F74-0000-11AA-AA11-00306543ECAC", N_("Apple boot")), DEF_GUID("4C616265-6C00-11AA-AA11-00306543ECAC", N_("Apple label")), DEF_GUID("5265636F-7665-11AA-AA11-00306543ECAC", N_("Apple TV recovery")), DEF_GUID("53746F72-6167-11AA-AA11-00306543ECAC", N_("Apple Core storage")), /* Solaris */ DEF_GUID("6A82CB45-1DD2-11B2-99A6-080020736631", N_("Solaris boot")), DEF_GUID("6A85CF4D-1DD2-11B2-99A6-080020736631", N_("Solaris root")), /* same as Apple ZFS */ DEF_GUID("6A898CC3-1DD2-11B2-99A6-080020736631", N_("Solaris /usr & Apple ZFS")), DEF_GUID("6A87C46F-1DD2-11B2-99A6-080020736631", N_("Solaris swap")), DEF_GUID("6A8B642B-1DD2-11B2-99A6-080020736631", N_("Solaris backup")), DEF_GUID("6A8EF2E9-1DD2-11B2-99A6-080020736631", N_("Solaris /var")), DEF_GUID("6A90BA39-1DD2-11B2-99A6-080020736631", N_("Solaris /home")), DEF_GUID("6A9283A5-1DD2-11B2-99A6-080020736631", N_("Solaris alternate sector")), DEF_GUID("6A945A3B-1DD2-11B2-99A6-080020736631", N_("Solaris reserved 1")), DEF_GUID("6A9630D1-1DD2-11B2-99A6-080020736631", N_("Solaris reserved 2")), DEF_GUID("6A980767-1DD2-11B2-99A6-080020736631", N_("Solaris reserved 3")), DEF_GUID("6A96237F-1DD2-11B2-99A6-080020736631", N_("Solaris reserved 4")), DEF_GUID("6A8D2AC7-1DD2-11B2-99A6-080020736631", N_("Solaris reserved 5")), /* NetBSD */ DEF_GUID("49F48D32-B10E-11DC-B99B-0019D1879648", N_("NetBSD swap")), DEF_GUID("49F48D5A-B10E-11DC-B99B-0019D1879648", N_("NetBSD FFS")), DEF_GUID("49F48D82-B10E-11DC-B99B-0019D1879648", N_("NetBSD LFS")), DEF_GUID("2DB519C4-B10E-11DC-B99B-0019D1879648", N_("NetBSD concatenated")), DEF_GUID("2DB519EC-B10E-11DC-B99B-0019D1879648", N_("NetBSD encrypted")), DEF_GUID("49F48DAA-B10E-11DC-B99B-0019D1879648", N_("NetBSD RAID")), /* ChromeOS */ DEF_GUID("FE3A2A5D-4F32-41A7-B725-ACCC3285A309", N_("ChromeOS kernel")), DEF_GUID("3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC", N_("ChromeOS root fs")), DEF_GUID("2E0A753D-9E48-43B0-8337-B15192CB1B5E", N_("ChromeOS reserved")), /* MidnightBSD */ DEF_GUID("85D5E45A-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD data")), DEF_GUID("85D5E45E-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD boot")), DEF_GUID("85D5E45B-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD swap")), DEF_GUID("0394Ef8B-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD UFS")), DEF_GUID("85D5E45D-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD ZFS")), DEF_GUID("85D5E45C-237C-11E1-B4B3-E89A8F7FC3A7", N_("MidnightBSD Vinum")), }; /* primary GPT header */ static struct gpt_header *pheader = NULL; /* backup GPT header */ static struct gpt_header *bheader = NULL; /* partition entry array */ static struct gpt_entry *ents = NULL; #define gpt_partition_start(_e) le64_to_cpu((_e)->lba_start) #define gpt_partition_end(_e) le64_to_cpu((_e)->lba_end) /* * Returns the partition length, or 0 if end is before beginning. */ static uint64_t gpt_partition_size(const struct gpt_entry *e) { uint64_t start = gpt_partition_start(e); uint64_t end = gpt_partition_end(e); return start > end ? 0 : end - start + 1ULL; } /* * UUID is traditionally 16 byte big-endian array, except Intel EFI * specification where the UUID is a structure of little-endian fields. */ static void swap_efi_guid(struct gpt_guid *uid) { uid->time_low = swab32(uid->time_low); uid->time_mid = swab16(uid->time_mid); uid->time_hi_and_version = swab16(uid->time_hi_and_version); } static int string_to_uuid(const char *in, struct gpt_guid *uuid) { if (uuid_parse(in, (unsigned char *) uuid)) return -1; swap_efi_guid(uuid); return 0; } static void uuid_to_string(struct gpt_guid *uuid, char *out) { uuid_unparse_upper((unsigned char *) uuid, out); } static const char *gpt_get_header_revstr(struct gpt_header *header) { if (!header) goto unknown; switch (header->revision) { case GPT_HEADER_REVISION_V1_02: return "1.2"; case GPT_HEADER_REVISION_V1_00: return "1.0"; case GPT_HEADER_REVISION_V0_99: return "0.99"; default: goto unknown; } unknown: return "unknown"; } static inline int partition_unused(const struct gpt_entry *e) { return !memcmp(&e->partition_type_guid, &GPT_UNUSED_ENTRY_GUID, sizeof(struct gpt_guid)); } /* * Builds a clean new valid protective MBR - will wipe out any existing data. * Returns 0 on success, otherwise < 0 on error. */ static int gpt_mknew_pmbr(struct fdisk_context *cxt) { struct gpt_legacy_mbr *pmbr = NULL; if (!cxt || !cxt->firstsector) return -ENOSYS; fdisk_zeroize_firstsector(cxt); pmbr = (struct gpt_legacy_mbr *) cxt->firstsector; pmbr->signature = cpu_to_le16(MSDOS_MBR_SIGNATURE); pmbr->partition_record[0].os_type = EFI_PMBR_OSTYPE; pmbr->partition_record[0].start_sector = 1; pmbr->partition_record[0].end_head = 0xFE; pmbr->partition_record[0].end_sector = 0xFF; pmbr->partition_record[0].end_track = 0xFF; pmbr->partition_record[0].starting_lba = cpu_to_le32(1); pmbr->partition_record[0].size_in_lba = cpu_to_le32(min((uint32_t) cxt->total_sectors - 1, 0xFFFFFFFF)); return 0; } /* some universal differences between the headers */ static void gpt_mknew_header_common(struct fdisk_context *cxt, struct gpt_header *header, uint64_t lba) { if (!cxt || !header) return; header->my_lba = cpu_to_le64(lba); if (lba == GPT_PRIMARY_PARTITION_TABLE_LBA) { /* primary */ header->alternative_lba = cpu_to_le64(cxt->total_sectors - 1); header->partition_entry_lba = cpu_to_le64(2); } else { /* backup */ uint64_t esz = le32_to_cpu(header->npartition_entries) * sizeof(struct gpt_entry); uint64_t esects = (esz + cxt->sector_size - 1) / cxt->sector_size; header->alternative_lba = cpu_to_le64(GPT_PRIMARY_PARTITION_TABLE_LBA); header->partition_entry_lba = cpu_to_le64(cxt->total_sectors - 1 - esects); } } /* * Builds a new GPT header (at sector lba) from a backup header2. * If building a primary header, then backup is the secondary, and vice versa. * * Always pass a new (zeroized) header to build upon as we don't * explicitly zero-set some values such as CRCs and reserved. * * Returns 0 on success, otherwise < 0 on error. */ static int gpt_mknew_header_from_bkp(struct fdisk_context *cxt, struct gpt_header *header, uint64_t lba, struct gpt_header *header2) { if (!cxt || !header || !header2) return -ENOSYS; header->signature = header2->signature; header->revision = header2->revision; header->size = header2->size; header->npartition_entries = header2->npartition_entries; header->sizeof_partition_entry = header2->sizeof_partition_entry; header->first_usable_lba = header2->first_usable_lba; header->last_usable_lba = header2->last_usable_lba; memcpy(&header->disk_guid, &header2->disk_guid, sizeof(header2->disk_guid)); gpt_mknew_header_common(cxt, header, lba); return 0; } /* * Builds a clean new GPT header (currently under revision 1.0). * * Always pass a new (zeroized) header to build upon as we don't * explicitly zero-set some values such as CRCs and reserved. * * Returns 0 on success, otherwise < 0 on error. */ static int gpt_mknew_header(struct fdisk_context *cxt, struct gpt_header *header, uint64_t lba) { uint64_t esz = 0, first, last; if (!cxt || !header) return -ENOSYS; esz = sizeof(struct gpt_entry) * GPT_NPARTITIONS / cxt->sector_size; header->signature = cpu_to_le64(GPT_HEADER_SIGNATURE); header->revision = cpu_to_le32(GPT_HEADER_REVISION_V1_00); header->size = cpu_to_le32(sizeof(struct gpt_header)); /* * 128 partitions is the default. It can go behond this, however, * we're creating a de facto header here, so no funny business. */ header->npartition_entries = cpu_to_le32(GPT_NPARTITIONS); header->sizeof_partition_entry = cpu_to_le32(sizeof(struct gpt_entry)); last = cxt->total_sectors - 2 - esz; first = esz + 2; if (first < cxt->first_lba && cxt->first_lba < last) /* Align according to topology */ first = cxt->first_lba; header->first_usable_lba = cpu_to_le64(first); header->last_usable_lba = cpu_to_le64(last); gpt_mknew_header_common(cxt, header, lba); uuid_generate_random((unsigned char *) &header->disk_guid); swap_efi_guid(&header->disk_guid); return 0; } /* * Checks if there is a valid protective MBR partition table. * Returns 0 if it is invalid or failure. Otherwise, return * GPT_MBR_PROTECTIVE or GPT_MBR_HYBRID, depeding on the detection. */ static int valid_pmbr(struct fdisk_context *cxt) { int i, ret = 0; /* invalid by default */ struct gpt_legacy_mbr *pmbr = NULL; if (!cxt->firstsector) goto done; pmbr = (struct gpt_legacy_mbr *) cxt->firstsector; if (pmbr->signature != cpu_to_le64(MSDOS_MBR_SIGNATURE)) goto done; /* LBA of the GPT partition header */ if (pmbr->partition_record[0].starting_lba != cpu_to_le32(GPT_PRIMARY_PARTITION_TABLE_LBA)) goto done; /* seems like a valid MBR was found, check DOS primary partitions */ for (i = 0; i < 4; i++) if (pmbr->partition_record[i].os_type == EFI_PMBR_OSTYPE) { /* * Ok, we at least know that there's a protective MBR, * now check if there are other partition types for * hybrid MBR. */ ret = GPT_MBR_PROTECTIVE; goto check_hybrid; } check_hybrid: if (ret != GPT_MBR_PROTECTIVE) goto done; for (i = 0 ; i < 4; i++) if ((pmbr->partition_record[i].os_type != EFI_PMBR_OSTYPE) && (pmbr->partition_record[i].os_type != 0x00)) ret = GPT_MBR_HYBRID; /* * Protective MBRs take up the lesser of the whole disk * or 2 TiB (32bit LBA), ignoring the rest of the disk. * * Hybrid MBRs do not necessarily comply with this. */ if (ret == GPT_MBR_PROTECTIVE) if (pmbr->partition_record[0].size_in_lba != cpu_to_le32(min((uint32_t) cxt->total_sectors - 1, 0xFFFFFFFF))) ret = 0; done: return ret; } static uint64_t last_lba(struct fdisk_context *cxt) { struct stat s; memset(&s, 0, sizeof(s)); if (fstat(cxt->dev_fd, &s) == -1) { fprintf(stderr, "last_lba() could not stat: %m\n"); return 0; } if (S_ISBLK(s.st_mode)) return cxt->total_sectors - 1; else if (S_ISREG(s.st_mode)) { uint64_t sectors = s.st_size >> cxt->sector_size; return (sectors / cxt->sector_size) - 1ULL; } else { fprintf(stderr, "last_lba(): I don't know how to handle files with mode %o\n", s.st_mode); } return 0; } static ssize_t read_lba(struct fdisk_context *cxt, uint64_t lba, void *buffer, const size_t bytes) { off_t offset = lba * cxt->sector_size; lseek(cxt->dev_fd, offset, SEEK_SET); return read(cxt->dev_fd, buffer, bytes); } /* Returns the GPT entry array */ static struct gpt_entry *gpt_get_entries(struct fdisk_context *cxt, struct gpt_header *header, const ssize_t sz) { struct gpt_entry *ret = xcalloc(1, sizeof(*ents) * sz); off_t offset = le64_to_cpu(header->partition_entry_lba) * cxt->sector_size; if (offset != lseek(cxt->dev_fd, offset, SEEK_SET)) return NULL; if (sz != read(cxt->dev_fd, ret, sz)) return NULL; return ret; } static inline uint32_t count_crc32(const unsigned char *buf, size_t len) { return (crc32(~0L, buf, len) ^ ~0L); } /* * Recompute header and partition array 32bit CRC checksums. * This function does not fail - if there's corruption, then it * will be reported when checksuming it again (ie: probing or verify). */ static void gpt_recompute_crc(struct gpt_header *header, struct gpt_entry *e) { uint32_t crc = 0; size_t entry_sz = 0; if (!header) return; /* header CRC */ header->crc32 = 0; crc = count_crc32((unsigned char *) header, le32_to_cpu(header->size)); header->crc32 = cpu_to_le32(crc); /* partition entry array CRC */ header->partition_entry_array_crc32 = 0; entry_sz = le32_to_cpu(header->npartition_entries) * le32_to_cpu(header->sizeof_partition_entry); crc = count_crc32((unsigned char *) e, entry_sz); header->partition_entry_array_crc32 = cpu_to_le32(crc); } /* * Compute the 32bit CRC checksum of the partition table header. * Returns 1 if it is valid, otherwise 0. */ static int gpt_check_header_crc(struct gpt_header *header) { uint32_t crc, orgcrc = le32_to_cpu(header->crc32); header->crc32 = 0; crc = count_crc32((unsigned char *) header, le32_to_cpu(header->size)); header->crc32 = cpu_to_le32(orgcrc); /* * If we have checksum mismatch it may be due to stale data, * like a partition being added or deleted. Recompute the CRC again * and make sure this is not the case. */ if (crc != le32_to_cpu(header->crc32)) { gpt_recompute_crc(header, ents); orgcrc = le32_to_cpu(header->crc32); header->crc32 = 0; crc = count_crc32((unsigned char *) header, le32_to_cpu(header->size)); header->crc32 = cpu_to_le32(orgcrc); return crc == le32_to_cpu(header->crc32); } else return 1; } /* * It initializes the partition entry array. * Returns 1 if the checksum is valid, otherwise 0. */ static int gpt_check_entryarr_crc(struct fdisk_context *cxt, struct gpt_header *header) { int ret = 0; ssize_t entry_sz; uint32_t crc; if (!header) goto done; entry_sz = le32_to_cpu(header->npartition_entries) * le32_to_cpu(header->sizeof_partition_entry); if (!entry_sz) goto done; /* read header entries */ if (!ents) ents = gpt_get_entries(cxt, header, entry_sz); if (!ents) goto done; crc = count_crc32((unsigned char *) ents, entry_sz); ret = (crc == le32_to_cpu(header->partition_entry_array_crc32)); done: return ret; } static int gpt_check_lba_sanity(struct fdisk_context *cxt, struct gpt_header *header) { int ret = 0; uint64_t lu, fu, lastlba = last_lba(cxt); fu = le64_to_cpu(header->first_usable_lba); lu = le64_to_cpu(header->last_usable_lba); /* check if first and last usable LBA make sense */ if (lu < fu) { DBG(LABEL, dbgprint("error: header last LBA is before first LBA")); goto done; } /* check if first and last usable LBAs with the disk's last LBA */ if (fu > lastlba || lu > lastlba) { DBG(LABEL, dbgprint("error: header LBAs are after the disk's last LBA")); goto done; } /* the header has to be outside usable range */ if (fu < GPT_PRIMARY_PARTITION_TABLE_LBA && GPT_PRIMARY_PARTITION_TABLE_LBA < lu) { DBG(LABEL, dbgprint("error: header outside of usable range")); goto done; } ret = 1; /* sane */ done: return ret; } /* Check if there is a valid header signature */ static int gpt_check_signature(struct gpt_header *header) { return header->signature == cpu_to_le64(GPT_HEADER_SIGNATURE); } /* * Return the specified GPT Header, or NULL upon failure/invalid. * Note that all tests must pass to ensure a valid header, * we do not rely on only testing the signature for a valid probe. */ static struct gpt_header *gpt_get_header(struct fdisk_context *cxt, uint64_t lba) { struct gpt_header *header = NULL; uint32_t hsz; if (!cxt) return NULL; header = xcalloc(1, sizeof(*header)); /* read specified LBA */ if (!read_lba(cxt, lba, header, sizeof(struct gpt_header))) goto invalid; if (!gpt_check_signature(header)) goto invalid; if (!gpt_check_header_crc(header) || !gpt_check_entryarr_crc(cxt, header)) goto invalid; if (!gpt_check_lba_sanity(cxt, header)) goto invalid; /* valid header must be at MyLBA */ if (le64_to_cpu(header->my_lba) != lba) goto invalid; /* make sure header size is between 92 and sector size bytes */ hsz = le32_to_cpu(header->size); if (hsz < GPT_HEADER_MINSZ || hsz > cxt->sector_size) goto invalid; return header; invalid: free(header); return NULL; } /* * Return the Backup GPT Header, or NULL upon failure/invalid. */ static struct gpt_header *gpt_get_bheader(struct fdisk_context *cxt) { return gpt_get_header(cxt, last_lba(cxt)); } /* * Return the Primary GPT Header, or NULL upon failure/invalid. */ static struct gpt_header *gpt_get_pheader(struct fdisk_context *cxt) { return gpt_get_header(cxt, GPT_PRIMARY_PARTITION_TABLE_LBA); } /* * Returns the number of partitions that are in use. */ static unsigned partitions_in_use(struct gpt_header *header, struct gpt_entry *e) { uint32_t i, used = 0; if (!header || ! e) return 0; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) if (!partition_unused(&e[i])) used++; return used; } /* * Check if a partition is too big for the disk (sectors). * Returns the faulting partition number, otherwise 0. */ static unsigned partition_check_too_big(struct gpt_header *header, struct gpt_entry *e, uint64_t sectors) { uint32_t i; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) { if (partition_unused(&e[i])) continue; if (gpt_partition_end(&e[i]) >= sectors) return i + 1; } return 0; } /* * Check if a partition ends before it begins * Returns the faulting partition number, otherwise 0. */ static unsigned partition_start_after_end(struct gpt_header *header, struct gpt_entry *e) { uint32_t i; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) { if (partition_unused(&e[i])) continue; if (gpt_partition_start(&e[i]) > gpt_partition_end(&e[i])) return i + 1; } return 0; } /* * Check if partition e1 overlaps with partition e2 */ static inline int partition_overlap(struct gpt_entry *e1, struct gpt_entry *e2) { uint64_t start1 = gpt_partition_start(e1); uint64_t end1 = gpt_partition_end(e1); uint64_t start2 = gpt_partition_start(e2); uint64_t end2 = gpt_partition_end(e2); return (start1 && start2 && (start1 <= end2) != (end1 < start2)); } /* * Find any paritions that overlap. */ static unsigned partition_check_overlaps(struct gpt_header *header, struct gpt_entry *e) { uint32_t i, j; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) for (j = 0; j < i; j++) { if (partition_unused(&e[i]) || partition_unused(&e[j])) continue; if (partition_overlap(&e[i], &e[j])) /* two overlaping partitions is enough! */ return i + 1; } return 0; } /* * Find the first available block after the starting point; returns 0 if * there are no available blocks left, or error. From gdisk. */ static uint64_t find_first_available(struct gpt_header *header, struct gpt_entry *e, uint64_t start) { uint64_t first; uint32_t i, first_moved = 0; uint64_t fu, lu; if (!header || !e) return 0; fu = le64_to_cpu(header->first_usable_lba); lu = le64_to_cpu(header->last_usable_lba); /* * Begin from the specified starting point or from the first usable * LBA, whichever is greater... */ first = start < fu ? fu : start; /* * Now search through all partitions; if first is within an * existing partition, move it to the next sector after that * partition and repeat. If first was moved, set firstMoved * flag; repeat until firstMoved is not set, so as to catch * cases where partitions are out of sequential order.... */ do { first_moved = 0; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) { if (partition_unused(&e[i])) continue; if (first < gpt_partition_start(&e[i])) continue; if (first <= gpt_partition_end(&e[i])) { first = gpt_partition_end(&e[i]) + 1; first_moved = 1; } } } while (first_moved == 1); if (first > lu) first = 0; return first; } /* Returns last available sector in the free space pointed to by start. From gdisk. */ static uint64_t find_last_free(struct gpt_header *header, struct gpt_entry *e, uint64_t start) { uint32_t i; uint64_t nearest_start; if (!header || !e) return 0; nearest_start = le64_to_cpu(header->last_usable_lba); for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) { uint64_t ps = gpt_partition_start(&e[i]); if (nearest_start > ps && ps > start) nearest_start = ps - 1; } return nearest_start; } /* Returns the last free sector on the disk. From gdisk. */ static uint64_t find_last_free_sector(struct gpt_header *header, struct gpt_entry *e) { uint32_t i, last_moved; uint64_t last = 0; if (!header || !e) goto done; /* start by assuming the last usable LBA is available */ last = le64_to_cpu(header->last_usable_lba); do { last_moved = 0; for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) { if ((last >= gpt_partition_start(&e[i])) && (last <= gpt_partition_end(&e[i]))) { last = gpt_partition_start(&e[i]) - 1; last_moved = 1; } } } while (last_moved == 1); done: return last; } /* * Finds the first available sector in the largest block of unallocated * space on the disk. Returns 0 if there are no available blocks left. * From gdisk. */ static uint64_t find_first_in_largest(struct gpt_header *header, struct gpt_entry *e) { uint64_t start = 0, first_sect, last_sect; uint64_t segment_size, selected_size = 0, selected_segment = 0; if (!header || !e) goto done; do { first_sect = find_first_available(header, e, start); if (first_sect != 0) { last_sect = find_last_free(header, e, first_sect); segment_size = last_sect - first_sect + 1; if (segment_size > selected_size) { selected_size = segment_size; selected_segment = first_sect; } start = last_sect + 1; } } while (first_sect != 0); done: return selected_segment; } /* * Find the total number of free sectors, the number of segments in which * they reside, and the size of the largest of those segments. From gdisk. */ static uint64_t get_free_sectors(struct fdisk_context *cxt, struct gpt_header *header, struct gpt_entry *e, uint32_t *nsegments, uint64_t *largest_segment) { uint32_t num = 0; uint64_t first_sect, last_sect; uint64_t largest_seg = 0, segment_sz; uint64_t totfound = 0, start = 0; /* starting point for each search */ if (!cxt->total_sectors) goto done; do { first_sect = find_first_available(header, e, start); if (first_sect) { last_sect = find_last_free(header, e, first_sect); segment_sz = last_sect - first_sect + 1; if (segment_sz > largest_seg) largest_seg = segment_sz; totfound += segment_sz; num++; start = last_sect + 1; } } while (first_sect); done: if (nsegments) *nsegments = num; if (largest_segment) *largest_segment = largest_seg; return totfound; } /* * Initialize fdisk-specific variables - call once probing passes! */ static void gpt_init(struct fdisk_context *cxt) { cxt->disklabel = FDISK_DISKLABEL_GPT; partitions = le32_to_cpu(pheader->npartition_entries); } /* * Deinitialize fdisk-specific variables */ static void gpt_deinit(struct fdisk_context *cxt) { free(ents); free(pheader); free(bheader); ents = NULL; pheader = NULL; bheader = NULL; cxt->disklabel = FDISK_DISKLABEL_ANY; partitions = 0; } static int gpt_probe_label(struct fdisk_context *cxt) { int mbr_type; if (!cxt) goto failed; mbr_type = valid_pmbr(cxt); if (!mbr_type) goto failed; DBG(LABEL, dbgprint("found a %s MBR", mbr_type == GPT_MBR_PROTECTIVE ? "protective" : "hybrid")); pheader = gpt_get_pheader(cxt); /* * TODO: If the primary GPT is corrupt, we must check the last LBA of the * device to see if it has a valid GPT Header and point to a valid GPT * Partition Entry Array. * If it points to a valid GPT Partition Entry Array, then software should * restore the primary GPT if allowed by platform policy settings. * * For now we just abort GPT probing! */ if (!pheader) goto failed; /* OK, probing passed, now initialize backup header and fdisk variables. */ bheader = gpt_get_bheader(cxt); gpt_init(cxt); printf(_("\nWARNING: fdisk GPT support is currently new, and therefore " "in an experimental phase. Use at your own discretion.\n\n")); return 1; failed: return 0; } /* * Stolen from libblkid - can be removed once partition semantics * are added to the fdisk API. */ static char *encode_to_utf8(unsigned char *src, size_t count) { uint16_t c; char *dest = xmalloc(count * sizeof(char)); size_t i, j, len = count; memset(dest, 0, sizeof(char) * count); for (j = i = 0; i + 2 <= count; i += 2) { /* always little endian */ c = (src[i+1] << 8) | src[i]; if (c == 0) { dest[j] = '\0'; break; } else if (c < 0x80) { if (j+1 >= len) break; dest[j++] = (uint8_t) c; } else if (c < 0x800) { if (j+2 >= len) break; dest[j++] = (uint8_t) (0xc0 | (c >> 6)); dest[j++] = (uint8_t) (0x80 | (c & 0x3f)); } else { if (j+3 >= len) break; dest[j++] = (uint8_t) (0xe0 | (c >> 12)); dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f)); dest[j++] = (uint8_t) (0x80 | (c & 0x3f)); } } dest[j] = '\0'; return dest; } /* * List label partitions. * This function must currently exist to comply with standard fdisk * requirements, but once partition semantics are added to the fdisk * API it can be removed for custom implementation (see gpt_label struct). */ void gpt_list_table(struct fdisk_context *cxt, int xtra __attribute__ ((__unused__))) { uint32_t i; uint64_t fu = le64_to_cpu(pheader->first_usable_lba); uint64_t lu = le64_to_cpu(pheader->last_usable_lba); printf("\n# Start End Size Type Name\n"); for (i = 0; i < le32_to_cpu(pheader->npartition_entries); i++) { char *name = NULL, *sizestr = NULL; uint64_t start = gpt_partition_start(&ents[i]); uint64_t size = gpt_partition_size(&ents[i]); struct fdisk_parttype *t; if (partition_unused(&ents[i]) || !size) continue; /* the partition has to inside usable range */ if (start < fu || start + size - 1 > lu) continue; name = encode_to_utf8((unsigned char *)ents[i].partition_name, sizeof(ents[i].partition_name)); if (!name) continue; sizestr = size_to_human_string(SIZE_SUFFIX_1LETTER, size * cxt->sector_size); if (!sizestr) continue; t = fdisk_get_partition_type(cxt, i); printf("%2d %12ju %12ju %6s %-15.15s %s\n", i+1, start, gpt_partition_end(&ents[i]), sizestr, t->name, name); check_alignment(cxt, start, i); free(name); free(sizestr); fdisk_free_parttype(t); } } /* * Write partitions. * Returns 0 on success, or corresponding error otherwise. */ static int gpt_write_partitions(struct fdisk_context *cxt, struct gpt_header *header, struct gpt_entry *e) { off_t offset = le64_to_cpu(header->partition_entry_lba) * cxt->sector_size; uint32_t nparts = le32_to_cpu(header->npartition_entries); uint32_t totwrite = nparts * le32_to_cpu(header->sizeof_partition_entry); ssize_t rc; if (offset != lseek(cxt->dev_fd, offset, SEEK_SET)) goto fail; rc = write(cxt->dev_fd, e, totwrite); if (rc > 0 && totwrite == (uint32_t) rc) return 0; fail: return -errno; } /* * Write a GPT header to a specified LBA * Returns 0 on success, or corresponding error otherwise. */ static int gpt_write_header(struct fdisk_context *cxt, struct gpt_header *header, uint64_t lba) { off_t offset = lba * cxt->sector_size; if (offset != lseek(cxt->dev_fd, offset, SEEK_SET)) goto fail; if (cxt->sector_size == (size_t) write(cxt->dev_fd, header, cxt->sector_size)) return 0; fail: return -errno; } /* * Write the protective MBR. * Returns 0 on success, or corresponding error otherwise. */ static int gpt_write_pmbr(struct fdisk_context *cxt) { off_t offset; struct gpt_legacy_mbr *pmbr = NULL; if (!cxt || !cxt->firstsector) return -EINVAL; pmbr = (struct gpt_legacy_mbr *) cxt->firstsector; /* zero out the legacy partitions */ memset(pmbr->partition_record, 0, sizeof(pmbr->partition_record)); pmbr->signature = cpu_to_le16(MSDOS_MBR_SIGNATURE); pmbr->partition_record[0].os_type = EFI_PMBR_OSTYPE; pmbr->partition_record[0].start_sector = 1; pmbr->partition_record[0].end_head = 0xFE; pmbr->partition_record[0].end_sector = 0xFF; pmbr->partition_record[0].end_track = 0xFF; pmbr->partition_record[0].starting_lba = cpu_to_le32(1); /* * Set size_in_lba to the size of the disk minus one. If the size of the disk * is too large to be represented by a 32bit LBA (2Tb), set it to 0xFFFFFFFF. */ if (cxt->total_sectors - 1 > 0xFFFFFFFFULL) pmbr->partition_record[0].size_in_lba = cpu_to_le32(0xFFFFFFFF); else pmbr->partition_record[0].size_in_lba = cpu_to_le32(cxt->total_sectors - 1UL); offset = GPT_PMBR_LBA * cxt->sector_size; if (offset != lseek(cxt->dev_fd, offset, SEEK_SET)) goto fail; /* pMBR covers the first sector (LBA) of the disk */ if (write_all(cxt->dev_fd, pmbr, cxt->sector_size)) goto fail; return 0; fail: return -errno; } /* * Writes in-memory GPT and pMBR data to disk. * Returns 0 if successful write, otherwise, a corresponding error. * Any indication of error will abort the operation. */ static int gpt_write_disklabel(struct fdisk_context *cxt) { if (!cxt) goto err0; /* we do not want to mess up hybrid MBRs by creating a valid pmbr */ if (valid_pmbr(cxt) == GPT_MBR_HYBRID) goto err0; /* check that disk is big enough to handle the backup header */ if (pheader->alternative_lba > cxt->total_sectors) goto err0; /* check that the backup header is properly placed */ if (pheader->alternative_lba < cxt->total_sectors - 1) /* TODO: correct this (with user authorization) and write */ goto err0; if (partition_check_overlaps(pheader, ents)) goto err0; /* recompute CRCs for both headers */ gpt_recompute_crc(pheader, ents); gpt_recompute_crc(bheader, ents); /* * UEFI requires writing in this specific order: * 1) backup partition tables * 2) backup GPT header * 3) primary partition tables * 4) primary GPT header * 5) protective MBR * * If any write fails, we abort the rest. */ if (gpt_write_partitions(cxt, bheader, ents) != 0) goto err1; if (gpt_write_header(cxt, bheader, pheader->alternative_lba) != 0) goto err1; if (gpt_write_partitions(cxt, pheader, ents) != 0) goto err1; if (gpt_write_header(cxt, pheader, GPT_PRIMARY_PARTITION_TABLE_LBA) != 0) goto err1; if (gpt_write_pmbr(cxt) != 0) goto err1; return 0; err0: return -EINVAL; err1: return -errno; } /* * Verify data integrity and report any found problems for: * - primary and backup header validations * - paritition validations */ static int gpt_verify_disklabel(struct fdisk_context *cxt) { int nerror = 0, ptnum; if (!bheader) { nerror++; printf(_("Disk does not contain a valid backup header.\n")); } if (!gpt_check_header_crc(pheader)) { nerror++; printf(_("Invalid primary header CRC checksum.\n")); } if (bheader && !gpt_check_header_crc(bheader)) { nerror++; printf(_("Invalid backup header CRC checksum.\n")); } if (!gpt_check_entryarr_crc(cxt, pheader)) { nerror++; printf(_("Invalid partition entry checksum.\n")); } if (!gpt_check_lba_sanity(cxt, pheader)) { nerror++; printf(_("Invalid primary header LBA sanity checks.\n")); } if (bheader && !gpt_check_lba_sanity(cxt, bheader)) { nerror++; printf(_("Invalid backup header LBA sanity checks.\n")); } if (le64_to_cpu(pheader->my_lba) != GPT_PRIMARY_PARTITION_TABLE_LBA) { nerror++; printf(_("MyLBA mismatch with real position at primary header.\n")); } if (bheader && le64_to_cpu(bheader->my_lba) != last_lba(cxt)) { nerror++; printf(_("MyLBA mismatch with real position at backup header.\n")); } if (pheader->alternative_lba >= cxt->total_sectors) { nerror++; printf(_("Disk is to small to hold all data.\n")); } /* * if the GPT is the primary table, check the alternateLBA * to see if it is a valid GPT */ if (bheader && (pheader->my_lba != bheader->alternative_lba)) { nerror++; printf(_("Primary and backup header mismatch.\n")); } ptnum = partition_check_overlaps(pheader, ents); if (ptnum) { nerror++; printf(_("Partition %d overlaps with partition %d.\n"), ptnum, ptnum + 1); } ptnum = partition_check_too_big(pheader, ents, cxt->total_sectors); if (ptnum) { nerror++; printf(_("Partition %u is too big for the disk.\n"), ptnum); } ptnum = partition_start_after_end(pheader, ents); if (ptnum) { nerror++; printf(_("Partition %u ends before it starts.\n"), ptnum); } if (!nerror) { /* yay :-) */ uint32_t nsegments = 0; uint64_t free_sectors = 0, largest_segment = 0; printf(_("No errors detected\n")); printf(_("Header version: %s\n"), gpt_get_header_revstr(pheader)); printf(_("Using %d out of %d partitions\n"), partitions_in_use(pheader, ents), le32_to_cpu(pheader->npartition_entries)); free_sectors = get_free_sectors(cxt, pheader, ents, &nsegments, &largest_segment); printf(_("A total of %ju free sectors available in %u segment(s) " "(largest %ju).\n"), free_sectors, nsegments, largest_segment); } else printf(_("Detected %d error(s).\n"), nerror); return 0; } /* Delete a single GPT partition, specified by partnum. */ static int gpt_delete_partition(struct fdisk_context *cxt, int partnum) { if (!cxt || partition_unused(&ents[partnum]) || partnum < 0) return -EINVAL; /* hasta la vista, baby! */ memset(&ents[partnum], 0, sizeof(ents[partnum])); if (!partition_unused(&ents[partnum])) return -EINVAL; else { gpt_recompute_crc(pheader, ents); gpt_recompute_crc(bheader, ents); } return 0; } static void gpt_entry_set_type(struct gpt_entry *e, struct gpt_guid *type) { size_t i; /* * Copy corresponding partition type GUID. Only the first three blocks * are endian-aware. */ e->partition_type_guid.time_low = cpu_to_le32(type->time_low); e->partition_type_guid.time_mid = cpu_to_le16(type->time_mid); e->partition_type_guid.time_hi_and_version = cpu_to_le16(type->time_hi_and_version); e->partition_type_guid.clock_seq_hi = type->clock_seq_hi; e->partition_type_guid.clock_seq_low = type->clock_seq_low; for (i = 0; i < 6; i++) e->partition_type_guid.node[i] = type->node[i]; DBG(LABEL, fprintf(stderr, "new type: %08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X\n", type->time_low, type->time_mid, type->time_hi_and_version, type->clock_seq_hi, type->clock_seq_low, type->node[0], type->node[1], type->node[2], type->node[3], type->node[4], type->node[5])); } /* * Create a new GPT partition entry, specified by partnum, and with a range * of fsect to lsenct sectors, of type t. * Returns 0 on success, or negative upon failure. */ static int gpt_create_new_partition(int partnum, uint64_t fsect, uint64_t lsect, struct gpt_guid *type, struct gpt_entry *entries) { struct gpt_entry *e = NULL; if (fsect > lsect || partnum < 0) return -EINVAL; e = xcalloc(1, sizeof(*e)); e->lba_end = cpu_to_le64(lsect); e->lba_start = cpu_to_le64(fsect); gpt_entry_set_type(e, type); /* deal with partition name for (i = 0; i < GPT_PART_NAME_LEN; i++) e->partition_name[i] = cpu_to_le16((uint16_t) gpt_sys_types[sys].name[i]); */ /* * Any time a new partition entry is created a new GUID must be * generated for that partition, and every partition is guaranteed * to have a unique GUID. */ uuid_generate_random((unsigned char *) &e->unique_partition_guid); swap_efi_guid(&e->unique_partition_guid); memcpy(&entries[partnum] , e, sizeof(*e)); gpt_recompute_crc(pheader, entries); gpt_recompute_crc(bheader, entries); free(e); return 0; } /* Performs logical checks to add a new partition entry */ static int gpt_add_partition(struct fdisk_context *cxt, int partnum, struct fdisk_parttype *t) { uint64_t user_f, user_l; /* user input ranges for first and last sectors */ uint64_t disk_f, disk_l; /* first and last available sector ranges on device*/ uint64_t dflt_f, dflt_l; /* largest segment (default) */ struct gpt_guid uuid = GPT_DEFAULT_ENTRY_GUID; /* check basic tests before even considering adding a new partition */ if (!cxt || partnum < 0) return -EINVAL; if (!partition_unused(&ents[partnum])) { printf(_("Partition %d is already defined. " "Delete it before re-adding it.\n"), partnum +1); return -EINVAL; } if (le32_to_cpu(pheader->npartition_entries) == partitions_in_use(pheader, ents)) { printf(_("All partitions are already in use.\n")); return -EINVAL; } if (!get_free_sectors(cxt, pheader, ents, NULL, NULL)) { printf(_("No free sectors available.\n")); return -ENOSPC; } disk_f = find_first_available(pheader, ents, 0); disk_l = find_last_free_sector(pheader, ents); /* the default is the largest free space */ dflt_f = find_first_in_largest(pheader, ents); dflt_l = find_last_free(pheader, ents, dflt_f); /* align the default in range */ dflt_f = align_lba_in_range(cxt, dflt_f, dflt_f, dflt_l); if (t && t->typestr) string_to_uuid(t->typestr, &uuid); /* get user input for first and last sectors of the new partition */ for (;;) { int is_suffix_used = 0; /* first sector */ user_f = read_int(cxt, disk_f, /* minimal */ dflt_f, /* default */ disk_l, /* maximal */ 0, _("First sector")); if (user_f < disk_f || user_f > disk_l) continue; /* bug in read_int() dialog? */ if (user_f != find_first_available(pheader, ents, user_f)) { printf(_("Sector %ju already used\n"), user_f); continue; } /* Last sector */ dflt_l = find_last_free(pheader, ents, user_f); user_l = read_int_with_suffix(cxt, user_f, /* minimal */ dflt_l, /* default */ dflt_l, /* maximal */ user_f, /* base for relative input */ _("Last sector, +sectors or +size{K,M,G}"), &is_suffix_used); if (is_suffix_used) user_l = align_lba_in_range(cxt, user_l, user_f, dflt_l) - 1; if (user_l > user_f && user_l <= disk_l) break; } if (gpt_create_new_partition(partnum, user_f, user_l, &uuid, ents) != 0) printf(_("Could not create partition %d\n"), partnum + 1); else printf(_("Created partition %d\n"), partnum + 1); return 0; } /* * Create a new GPT disklabel - destroys any previous data. */ static int gpt_create_disklabel(struct fdisk_context *cxt) { int rc = 0; ssize_t entry_sz = 0; /* * Reset space or clear data from headers, pt entries and * protective MBR. Big fat warning: any previous content is * overwritten, so ask users to be sure!. * * When no header, entries or pmbr is set, we're probably * dealing with a new, empty disk - so always allocate memory * to deal with the data structures whatever the case is. */ gpt_deinit(cxt); rc = gpt_mknew_pmbr(cxt); if (rc < 0) goto done; pheader = xcalloc(1, sizeof(*pheader)); rc = gpt_mknew_header(cxt, pheader, GPT_PRIMARY_PARTITION_TABLE_LBA); if (rc < 0) goto done; bheader = xcalloc(1, sizeof(*bheader)); rc = gpt_mknew_header_from_bkp(cxt, bheader, last_lba(cxt), pheader); if (rc < 0) goto done; entry_sz = le32_to_cpu(pheader->npartition_entries) * le32_to_cpu(pheader->sizeof_partition_entry); ents = xcalloc(1, sizeof(*ents) * entry_sz); gpt_recompute_crc(pheader, ents); gpt_recompute_crc(bheader, ents); gpt_init(cxt); fprintf(stderr, ("Building a new GPT disklabel " "(GUID: %08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X)\n"), pheader->disk_guid.time_low, pheader->disk_guid.time_mid, pheader->disk_guid.time_hi_and_version, pheader->disk_guid.clock_seq_hi, pheader->disk_guid.clock_seq_low, pheader->disk_guid.node[0], pheader->disk_guid.node[1], pheader->disk_guid.node[2], pheader->disk_guid.node[3], pheader->disk_guid.node[4], pheader->disk_guid.node[5]); done: return rc; } static struct fdisk_parttype *gpt_get_partition_type(struct fdisk_context *cxt, int i) { struct fdisk_parttype *t; struct gpt_guid uuid; char str[37]; if (!cxt || i < 0 || (uint32_t) i >= le32_to_cpu(pheader->npartition_entries)) return NULL; uuid = ents[i].partition_type_guid; swap_efi_guid(&uuid); uuid_to_string(&uuid, str); t = fdisk_get_parttype_from_string(cxt, str); if (!t) t = fdisk_new_unknown_parttype(0, str); return t; } static int gpt_set_partition_type(struct fdisk_context *cxt, int i, struct fdisk_parttype *t) { struct gpt_guid uuid; if (!cxt || i < 0 || (uint32_t) i >= le32_to_cpu(pheader->npartition_entries) || !t || !t->typestr || string_to_uuid(t->typestr, &uuid) != 0) return -EINVAL; gpt_entry_set_type(&ents[i], &uuid); gpt_recompute_crc(pheader, ents); gpt_recompute_crc(bheader, ents); return 0; } const struct fdisk_label gpt_label = { .name = "gpt", .parttypes = gpt_parttypes, .nparttypes = ARRAY_SIZE(gpt_parttypes), .probe = gpt_probe_label, .write = gpt_write_disklabel, .verify = gpt_verify_disklabel, .create = gpt_create_disklabel, .part_add = gpt_add_partition, .part_delete = gpt_delete_partition, .part_get_type = gpt_get_partition_type, .part_set_type = gpt_set_partition_type };