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gerrit.twrp.me / android_bootable_recovery / 58f2132bc3954fc704787d477500a209eedb8e29 / . / libblkid / libfdisk / src / gpt.c
blob: 8c1c96c37240a363c73a6fa196425336254ec1b3 [file] [log] [blame]
/*
* Copyright (C) 2007 Karel Zak <kzak@redhat.com>
* Copyright (C) 2012 Davidlohr Bueso <dave@gnu.org>
*
* 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.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <uuid.h>
#include "fdiskP.h"
#include "nls.h"
#include "crc32.h"
#include "blkdev.h"
#include "bitops.h"
#include "strutils.h"
#include "all-io.h"
/**
* SECTION: gpt
* @title: UEFI GPT
* @short_description: specific functionality
*/
#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_TYPE "0FC63DAF-8483-4772-8E79-3D69D8477DE4"
/*
* Attribute bits
*/
enum {
/* UEFI specific */
GPT_ATTRBIT_REQ = 0,
GPT_ATTRBIT_NOBLOCK = 1,
GPT_ATTRBIT_LEGACY = 2,
/* GUID specific (range 48..64)*/
GPT_ATTRBIT_GUID_FIRST = 48,
GPT_ATTRBIT_GUID_COUNT = 16
};
#define GPT_ATTRSTR_REQ "RequiredPartiton"
#define GPT_ATTRSTR_NOBLOCK "NoBlockIOProtocol"
#define GPT_ATTRSTR_LEGACY "LegacyBIOSBootable"
/* The GPT Partition entry array contains an array of GPT entries. */
struct gpt_entry {
struct gpt_guid type; /* purpose and type of the partition */
struct gpt_guid partition_guid;
uint64_t lba_start;
uint64_t lba_end;
uint64_t attrs;
uint16_t 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 of block 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; /* LBA of start of partition entries 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 all 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")),
DEF_GUID("D3BFE2DE-3DAF-11DF-BA40-E3A556D89593", N_("Intel Fast Flash")),
/* Hah!IdontneedEFI */
DEF_GUID("21686148-6449-6E6F-744E-656564454649", N_("BIOS boot")),
/* 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 environment")),
DEF_GUID("37AFFC90-EF7D-4E96-91C3-2D7AE055B174", N_("IBM General Parallel Fs")),
DEF_GUID("E75CAF8F-F680-4CEE-AFA3-B001E56EFC2D", N_("Microsoft Storage Spaces")),
/* HP-UX */
DEF_GUID("75894C1E-3AEB-11D3-B7C1-7B03A0000000", N_("HP-UX data")),
DEF_GUID("E2A1E728-32E3-11D6-A682-7B03A0000000", N_("HP-UX service")),
/* Linux (http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec) */
DEF_GUID("0657FD6D-A4AB-43C4-84E5-0933C84B4F4F", N_("Linux swap")),
DEF_GUID("0FC63DAF-8483-4772-8E79-3D69D8477DE4", N_("Linux filesystem")),
DEF_GUID("3B8F8425-20E0-4F3B-907F-1A25A76F98E8", N_("Linux server data")),
DEF_GUID("44479540-F297-41B2-9AF7-D131D5F0458A", N_("Linux root (x86)")),
DEF_GUID("4F68BCE3-E8CD-4DB1-96E7-FBCAF984B709", N_("Linux root (x86-64)")),
DEF_GUID("8DA63339-0007-60C0-C436-083AC8230908", N_("Linux reserved")),
DEF_GUID("933AC7E1-2EB4-4F13-B844-0E14E2AEF915", N_("Linux home")),
DEF_GUID("A19D880F-05FC-4D3B-A006-743F0F84911E", N_("Linux RAID")),
DEF_GUID("BC13C2FF-59E6-4262-A352-B275FD6F7172", N_("Linux extended boot")),
DEF_GUID("E6D6D379-F507-44C2-A23C-238F2A3DF928", N_("Linux LVM")),
/* 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")),
};
/* gpt_entry macros */
#define gpt_partition_start(_e) le64_to_cpu((_e)->lba_start)
#define gpt_partition_end(_e) le64_to_cpu((_e)->lba_end)
/*
* in-memory fdisk GPT stuff
*/
struct fdisk_gpt_label {
struct fdisk_label head; /* generic part */
/* gpt specific part */
struct gpt_header *pheader; /* primary header */
struct gpt_header *bheader; /* backup header */
struct gpt_entry *ents; /* entries (partitions) */
};
static void gpt_deinit(struct fdisk_label *lb);
static inline struct fdisk_gpt_label *self_label(struct fdisk_context *cxt)
{
return (struct fdisk_gpt_label *) cxt->label;
}
/*
* 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;
}
/* prints UUID in the real byte order! */
static void gpt_debug_uuid(const char *mesg, struct gpt_guid *guid)
{
const unsigned char *uuid = (unsigned char *) guid;
fprintf(stderr, "%s: "
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n",
mesg,
uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5],
uuid[6], uuid[7],
uuid[8], uuid[9],
uuid[10], uuid[11], uuid[12], uuid[13], uuid[14],uuid[15]);
}
/*
* 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_guid(const char *in, struct gpt_guid *guid)
{
if (uuid_parse(in, (unsigned char *) guid)) /* BE */
return -1;
swap_efi_guid(guid); /* LE */
return 0;
}
static char *guid_to_string(const struct gpt_guid *guid, char *out)
{
struct gpt_guid u = *guid; /* LE */
swap_efi_guid(&u); /* BE */
uuid_unparse_upper((unsigned char *) &u, out);
return out;
}
static struct fdisk_parttype *gpt_partition_parttype(
struct fdisk_context *cxt,
const struct gpt_entry *e)
{
struct fdisk_parttype *t;
char str[37];
guid_to_string(&e->type, str);
t = fdisk_label_get_parttype_from_string(cxt->label, str);
return t ? : fdisk_new_unknown_parttype(0, str);
}
static void gpt_entry_set_type(struct gpt_entry *e, struct gpt_guid *uuid)
{
e->type = *uuid;
DBG(LABEL, gpt_debug_uuid("new type", &(e->type)));
}
static void gpt_entry_set_name(struct gpt_entry *e, char *str)
{
char name[GPT_PART_NAME_LEN] = { 0 };
size_t i, sz = strlen(str);
if (sz) {
if (sz > GPT_PART_NAME_LEN)
sz = GPT_PART_NAME_LEN;
memcpy(name, str, sz);
}
for (i = 0; i < GPT_PART_NAME_LEN; i++)
e->name[i] = cpu_to_le16((uint16_t) name[i]);
}
static int gpt_entry_set_uuid(struct gpt_entry *e, char *str)
{
struct gpt_guid uuid;
int rc;
rc = string_to_guid(str, &uuid);
if (rc)
return rc;
e->partition_guid = uuid;
return 0;
}
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->type, &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;
int rc;
if (!cxt || !cxt->firstsector)
return -ENOSYS;
rc = fdisk_init_firstsector_buffer(cxt);
if (rc)
return rc;
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;
}
static struct gpt_header *gpt_copy_header(struct fdisk_context *cxt,
struct gpt_header *src)
{
struct gpt_header *res;
if (!cxt || !src)
return NULL;
res = calloc(1, sizeof(*res));
if (!res) {
fdisk_warn(cxt, _("failed to allocate GPT header"));
return NULL;
}
res->my_lba = src->alternative_lba;
res->alternative_lba = src->my_lba;
res->signature = src->signature;
res->revision = src->revision;
res->size = src->size;
res->npartition_entries = src->npartition_entries;
res->sizeof_partition_entry = src->sizeof_partition_entry;
res->first_usable_lba = src->first_usable_lba;
res->last_usable_lba = src->last_usable_lba;
memcpy(&res->disk_guid, &src->disk_guid, sizeof(src->disk_guid));
if (res->my_lba == GPT_PRIMARY_PARTITION_TABLE_LBA)
res->partition_entry_lba = cpu_to_le64(2);
else {
uint64_t esz = le32_to_cpu(src->npartition_entries) * sizeof(struct gpt_entry);
uint64_t esects = (esz + cxt->sector_size - 1) / cxt->sector_size;
res->partition_entry_lba = cpu_to_le64(cxt->total_sectors - 1 - esects);
}
return res;
}
static void count_first_last_lba(struct fdisk_context *cxt,
uint64_t *first, uint64_t *last)
{
uint64_t esz = 0;
assert(cxt);
esz = sizeof(struct gpt_entry) * GPT_NPARTITIONS / cxt->sector_size;
*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;
}
/*
* 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 first, last;
int has_id = 0;
if (!cxt || !header)
return -ENOSYS;
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 are the default. It can go beyond that, but
* 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));
count_first_last_lba(cxt, &first, &last);
header->first_usable_lba = cpu_to_le64(first);
header->last_usable_lba = cpu_to_le64(last);
gpt_mknew_header_common(cxt, header, lba);
if (cxt->script) {
const char *id = fdisk_script_get_header(cxt->script, "label-id");
if (id && string_to_guid(id, &header->disk_guid) == 0)
has_id = 1;
}
if (!has_id) {
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, part = 0, ret = 0; /* invalid by default */
struct gpt_legacy_mbr *pmbr = NULL;
uint32_t sz_lba = 0;
if (!cxt->firstsector)
goto done;
pmbr = (struct gpt_legacy_mbr *) cxt->firstsector;
if (le16_to_cpu(pmbr->signature) != 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.
*/
part = i;
ret = GPT_MBR_PROTECTIVE;
goto check_hybrid;
}
}
if (ret != GPT_MBR_PROTECTIVE)
goto done;
check_hybrid:
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.
* Some partitioning programs, nonetheless, choose to set
* the size to the maximum 32-bit limitation, disregarding
* the disk size.
*
* Hybrid MBRs do not necessarily comply with this.
*
* Consider a bad value here to be a warning to support dd-ing
* an image from a smaller disk to a bigger disk.
*/
if (ret == GPT_MBR_PROTECTIVE) {
sz_lba = le32_to_cpu(pmbr->partition_record[part].size_in_lba);
if (sz_lba != (uint32_t) cxt->total_sectors - 1 && sz_lba != 0xFFFFFFFF) {
fdisk_warnx(cxt, _("GPT PMBR size mismatch (%u != %u) "
"will be corrected by w(rite)."),
sz_lba,
(uint32_t) cxt->total_sectors - 1);
fdisk_label_set_changed(cxt->label, 1);
}
}
done:
return ret;
}
static uint64_t last_lba(struct fdisk_context *cxt)
{
struct stat s;
uint64_t sectors = 0;
memset(&s, 0, sizeof(s));
if (fstat(cxt->dev_fd, &s) == -1) {
fdisk_warn(cxt, _("gpt: stat() failed"));
return 0;
}
if (S_ISBLK(s.st_mode))
sectors = cxt->total_sectors - 1;
else if (S_ISREG(s.st_mode))
sectors = ((uint64_t) s.st_size /
(uint64_t) cxt->sector_size) - 1ULL;
else
fdisk_warnx(cxt, _("gpt: cannot handle files with mode %o"), s.st_mode);
DBG(LABEL, ul_debug("GPT last LBA: %ju", sectors));
return sectors;
}
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;
if (lseek(cxt->dev_fd, offset, SEEK_SET) == (off_t) -1)
return -1;
return read(cxt->dev_fd, buffer, bytes) != bytes;
}
/* Returns the GPT entry array */
static struct gpt_entry *gpt_read_entries(struct fdisk_context *cxt,
struct gpt_header *header)
{
ssize_t sz;
struct gpt_entry *ret = NULL;
off_t offset;
assert(cxt);
assert(header);
sz = le32_to_cpu(header->npartition_entries) *
le32_to_cpu(header->sizeof_partition_entry);
ret = calloc(1, sz);
if (!ret)
return NULL;
offset = le64_to_cpu(header->partition_entry_lba) *
cxt->sector_size;
if (offset != lseek(cxt->dev_fd, offset, SEEK_SET))
goto fail;
if (sz != read(cxt->dev_fd, ret, sz))
goto fail;
return ret;
fail:
free(ret);
return NULL;
}
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 *ents)
{
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 *) ents, 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, struct gpt_entry *ents)
{
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 (crc == le32_to_cpu(header->crc32))
return 1;
/*
* 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 (ents) {
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);
}
return 0;
}
/*
* It initializes the partition entry array.
* Returns 1 if the checksum is valid, otherwise 0.
*/
static int gpt_check_entryarr_crc(struct gpt_header *header,
struct gpt_entry *ents)
{
int ret = 0;
ssize_t entry_sz;
uint32_t crc;
if (!header || !ents)
goto done;
entry_sz = le32_to_cpu(header->npartition_entries) *
le32_to_cpu(header->sizeof_partition_entry);
if (!entry_sz)
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, ul_debug("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, ul_debug("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, ul_debug("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_read_header(struct fdisk_context *cxt,
uint64_t lba,
struct gpt_entry **_ents)
{
struct gpt_header *header = NULL;
struct gpt_entry *ents = NULL;
uint32_t hsz;
if (!cxt)
return NULL;
header = calloc(1, sizeof(*header));
if (!header)
return NULL;
/* read and verify header */
if (read_lba(cxt, lba, header, sizeof(struct gpt_header)) != 0)
goto invalid;
if (!gpt_check_signature(header))
goto invalid;
if (!gpt_check_header_crc(header, NULL))
goto invalid;
/* read and verify entries */
ents = gpt_read_entries(cxt, header);
if (!ents)
goto invalid;
if (!gpt_check_entryarr_crc(header, ents))
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;
if (_ents)
*_ents = ents;
else
free(ents);
DBG(LABEL, ul_debug("found valid GPT Header on LBA %ju", lba));
return header;
invalid:
free(header);
free(ents);
DBG(LABEL, ul_debug("read GPT Header on LBA %ju failed", lba));
return NULL;
}
static int gpt_locate_disklabel(struct fdisk_context *cxt, int n,
const char **name, off_t *offset, size_t *size)
{
struct fdisk_gpt_label *gpt;
assert(cxt);
*name = NULL;
*offset = 0;
*size = 0;
switch (n) {
case 0:
*name = "PMBR";
*offset = 0;
*size = 512;
break;
case 1:
*name = _("GPT Header");
*offset = GPT_PRIMARY_PARTITION_TABLE_LBA * cxt->sector_size;
*size = sizeof(struct gpt_header);
break;
case 2:
*name = _("GPT Entries");
gpt = self_label(cxt);
*offset = le64_to_cpu(gpt->pheader->partition_entry_lba) * cxt->sector_size;
*size = le32_to_cpu(gpt->pheader->npartition_entries) *
le32_to_cpu(gpt->pheader->sizeof_partition_entry);
break;
default:
return 1; /* no more chunks */
}
return 0;
}
/*
* Returns the number of partitions that are in use.
*/
static unsigned partitions_in_use(struct gpt_header *header,
struct gpt_entry *ents)
{
uint32_t i, used = 0;
if (!header || ! ents)
return 0;
for (i = 0; i < le32_to_cpu(header->npartition_entries); i++)
if (!partition_unused(&ents[i]))
used++;
return used;
}
/*
* Check if a partition is too big for the disk (sectors).
* Returns the faulting partition number, otherwise 0.
*/
static uint32_t check_too_big_partitions(struct gpt_header *header,
struct gpt_entry *ents, uint64_t sectors)
{
uint32_t i;
for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) {
if (partition_unused(&ents[i]))
continue;
if (gpt_partition_end(&ents[i]) >= sectors)
return i + 1;
}
return 0;
}
/*
* Check if a partition ends before it begins
* Returns the faulting partition number, otherwise 0.
*/
static uint32_t check_start_after_end_paritions(struct gpt_header *header,
struct gpt_entry *ents)
{
uint32_t i;
for (i = 0; i < le32_to_cpu(header->npartition_entries); i++) {
if (partition_unused(&ents[i]))
continue;
if (gpt_partition_start(&ents[i]) > gpt_partition_end(&ents[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 partitions that overlap.
*/
static uint32_t check_overlap_partitions(struct gpt_header *header,
struct gpt_entry *ents)
{
uint32_t i, j;
for (i = 0; i < le32_to_cpu(header->npartition_entries); i++)
for (j = 0; j < i; j++) {
if (partition_unused(&ents[i]) ||
partition_unused(&ents[j]))
continue;
if (partition_overlap(&ents[i], &ents[j])) {
DBG(LABEL, ul_debug("GPT partitions overlap detected [%u vs. %u]", i, j));
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 *ents, uint64_t start)
{
uint64_t first;
uint32_t i, first_moved = 0;
uint64_t fu, lu;
if (!header || !ents)
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(&ents[i]))
continue;
if (first < gpt_partition_start(&ents[i]))
continue;
if (first <= gpt_partition_end(&ents[i])) {
first = gpt_partition_end(&ents[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 *ents, uint64_t start)
{
uint32_t i;
uint64_t nearest_start;
if (!header || !ents)
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(&ents[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 *ents)
{
uint32_t i, last_moved;
uint64_t last = 0;
if (!header || !ents)
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(&ents[i])) &&
(last <= gpt_partition_end(&ents[i]))) {
last = gpt_partition_start(&ents[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 *ents)
{
uint64_t start = 0, first_sect, last_sect;
uint64_t segment_size, selected_size = 0, selected_segment = 0;
if (!header || !ents)
goto done;
do {
first_sect = find_first_available(header, ents, start);
if (first_sect != 0) {
last_sect = find_last_free(header, ents, 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 *ents, 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, ents, start);
if (first_sect) {
last_sect = find_last_free(header, ents, 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;
}
static int gpt_probe_label(struct fdisk_context *cxt)
{
int mbr_type;
struct fdisk_gpt_label *gpt;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
/* TODO: it would be nice to support scenario when GPT headers are OK,
* but PMBR is corrupt */
mbr_type = valid_pmbr(cxt);
if (!mbr_type)
goto failed;
DBG(LABEL, ul_debug("found a %s MBR", mbr_type == GPT_MBR_PROTECTIVE ?
"protective" : "hybrid"));
/* primary header */
gpt->pheader = gpt_read_header(cxt, GPT_PRIMARY_PARTITION_TABLE_LBA,
&gpt->ents);
if (gpt->pheader)
/* primary OK, try backup from alternative LBA */
gpt->bheader = gpt_read_header(cxt,
le64_to_cpu(gpt->pheader->alternative_lba),
NULL);
else
/* primary corrupted -- try last LBA */
gpt->bheader = gpt_read_header(cxt, last_lba(cxt), &gpt->ents);
if (!gpt->pheader && !gpt->bheader)
goto failed;
/* primary OK, backup corrupted -- recovery */
if (gpt->pheader && !gpt->bheader) {
fdisk_warnx(cxt, _("The backup GPT table is corrupt, but the "
"primary appears OK, so that will be used."));
gpt->bheader = gpt_copy_header(cxt, gpt->pheader);
if (!gpt->bheader)
goto failed;
gpt_recompute_crc(gpt->bheader, gpt->ents);
/* primary corrupted, backup OK -- recovery */
} else if (!gpt->pheader && gpt->bheader) {
fdisk_warnx(cxt, _("The primary GPT table is corrupt, but the "
"backup appears OK, so that will be used."));
gpt->pheader = gpt_copy_header(cxt, gpt->bheader);
if (!gpt->pheader)
goto failed;
gpt_recompute_crc(gpt->pheader, gpt->ents);
}
cxt->label->nparts_max = le32_to_cpu(gpt->pheader->npartition_entries);
cxt->label->nparts_cur = partitions_in_use(gpt->pheader, gpt->ents);
return 1;
failed:
DBG(LABEL, ul_debug("GPT probe failed"));
gpt_deinit(cxt->label);
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;
size_t i, j, len = count;
dest = calloc(1, count);
if (!dest)
return NULL;
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;
}
static int gpt_entry_attrs_to_string(struct gpt_entry *e, char **res)
{
unsigned int n, count = 0;
size_t l;
char *bits, *p;
uint64_t attrs;
assert(e);
assert(res);
*res = NULL;
attrs = le64_to_cpu(e->attrs);
if (!attrs)
return 0; /* no attributes at all */
bits = (char *) &attrs;
/* Note that sizeof() is correct here, we need separators between
* the strings so also count \0 is correct */
*res = calloc(1, sizeof(GPT_ATTRSTR_NOBLOCK) +
sizeof(GPT_ATTRSTR_REQ) +
sizeof(GPT_ATTRSTR_LEGACY) +
sizeof("GUID:") + (GPT_ATTRBIT_GUID_COUNT * 3));
if (!*res)
return -errno;
p = *res;
if (isset(bits, GPT_ATTRBIT_REQ)) {
memcpy(p, GPT_ATTRSTR_REQ, (l = sizeof(GPT_ATTRSTR_REQ)));
p += l - 1;
}
if (isset(bits, GPT_ATTRBIT_NOBLOCK)) {
if (p > *res)
*p++ = ' ';
memcpy(p, GPT_ATTRSTR_NOBLOCK, (l = sizeof(GPT_ATTRSTR_NOBLOCK)));
p += l - 1;
}
if (isset(bits, GPT_ATTRBIT_LEGACY)) {
if (p > *res)
*p++ = ' ';
memcpy(p, GPT_ATTRSTR_LEGACY, (l = sizeof(GPT_ATTRSTR_LEGACY)));
p += l - 1;
}
for (n = GPT_ATTRBIT_GUID_FIRST;
n < GPT_ATTRBIT_GUID_FIRST + GPT_ATTRBIT_GUID_COUNT; n++) {
if (!isset(bits, n))
continue;
if (!count) {
if (p > *res)
*p++ = ' ';
p += sprintf(p, "GUID:%u", n);
} else
p += sprintf(p, ",%u", n);
count++;
}
return 0;
}
static int gpt_entry_attrs_from_string(
struct fdisk_context *cxt,
struct gpt_entry *e,
const char *str)
{
const char *p = str;
uint64_t attrs = 0;
char *bits;
assert(e);
assert(p);
DBG(LABEL, ul_debug("GPT: parsing string attributes '%s'", p));
bits = (char *) &attrs;
while (p && *p) {
int bit = -1;
while (isblank(*p)) p++;
if (!*p)
break;
DBG(LABEL, ul_debug(" parsing item '%s'", p));
if (strncmp(p, "GUID:", 5) == 0) {
p += 5;
continue;
} else if (strncmp(p, GPT_ATTRSTR_REQ,
sizeof(GPT_ATTRSTR_REQ) - 1) == 0) {
bit = GPT_ATTRBIT_REQ;
p += sizeof(GPT_ATTRSTR_REQ) - 1;
} else if (strncmp(p, GPT_ATTRSTR_LEGACY,
sizeof(GPT_ATTRSTR_LEGACY) - 1) == 0) {
bit = GPT_ATTRBIT_LEGACY;
p += sizeof(GPT_ATTRSTR_LEGACY) - 1;
} else if (strncmp(p, GPT_ATTRSTR_NOBLOCK,
sizeof(GPT_ATTRSTR_NOBLOCK) - 1) == 0) {
bit = GPT_ATTRBIT_NOBLOCK;
p += sizeof(GPT_ATTRSTR_NOBLOCK) - 1;
} else if (isdigit((unsigned int) *p)) {
char *end = NULL;
errno = 0;
bit = strtol(p, &end, 0);
if (errno || !end || end == str
|| bit < GPT_ATTRBIT_GUID_FIRST
|| bit >= GPT_ATTRBIT_GUID_FIRST + GPT_ATTRBIT_GUID_COUNT)
bit = -1;
else
p = end;
}
if (bit < 0) {
fdisk_warnx(cxt, _("unssuported GPT attribute bit '%s'"), p);
return -EINVAL;
}
setbit(bits, bit);
while (isblank(*p)) p++;
if (*p == ',')
p++;
}
e->attrs = cpu_to_le64(attrs);
return 0;
}
static int gpt_get_partition(struct fdisk_context *cxt, size_t n,
struct fdisk_partition *pa)
{
struct fdisk_gpt_label *gpt;
struct gpt_entry *e;
char u_str[37];
int rc = 0;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if ((uint32_t) n >= le32_to_cpu(gpt->pheader->npartition_entries))
return -EINVAL;
gpt = self_label(cxt);
e = &gpt->ents[n];
pa->used = !partition_unused(e) || gpt_partition_start(e);
if (!pa->used)
return 0;
pa->start = gpt_partition_start(e);
pa->size = gpt_partition_size(e);
pa->type = gpt_partition_parttype(cxt, e);
if (guid_to_string(&e->partition_guid, u_str)) {
pa->uuid = strdup(u_str);
if (!pa->uuid) {
rc = -errno;
goto done;
}
} else
pa->uuid = NULL;
rc = gpt_entry_attrs_to_string(e, &pa->attrs);
if (rc)
goto done;
pa->name = encode_to_utf8((unsigned char *)e->name, sizeof(e->name));
return 0;
done:
fdisk_reset_partition(pa);
return rc;
}
static int gpt_set_partition(struct fdisk_context *cxt, size_t n,
struct fdisk_partition *pa)
{
struct fdisk_gpt_label *gpt;
struct gpt_entry *e;
int rc = 0;
uint64_t start, end;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if ((uint32_t) n >= le32_to_cpu(gpt->pheader->npartition_entries))
return -EINVAL;
FDISK_INIT_UNDEF(start);
FDISK_INIT_UNDEF(end);
gpt = self_label(cxt);
e = &gpt->ents[n];
if (pa->uuid) {
char new_u[37], old_u[37];
guid_to_string(&e->partition_guid, old_u);
rc = gpt_entry_set_uuid(e, pa->uuid);
if (rc)
return rc;
guid_to_string(&e->partition_guid, new_u);
fdisk_info(cxt, _("Partition UUID changed from %s to %s."),
old_u, new_u);
}
if (pa->name) {
char *old = encode_to_utf8((unsigned char *)e->name, sizeof(e->name));
gpt_entry_set_name(e, pa->name);
fdisk_info(cxt, _("Partition name changed from '%s' to '%.*s'."),
old, (int) GPT_PART_NAME_LEN, pa->name);
free(old);
}
if (pa->type && pa->type->typestr) {
struct gpt_guid typeid;
rc = string_to_guid(pa->type->typestr, &typeid);
if (rc)
return rc;
gpt_entry_set_type(e, &typeid);
}
if (pa->attrs) {
rc = gpt_entry_attrs_from_string(cxt, e, pa->attrs);
if (rc)
return rc;
}
if (fdisk_partition_has_start(pa))
start = pa->start;
if (fdisk_partition_has_size(pa))
end = gpt_partition_start(e) + pa->size - 1ULL;
if (pa->end_follow_default) {
/* enlarge */
if (!FDISK_IS_UNDEF(start))
start = gpt_partition_start(e);
end = find_last_free(gpt->bheader, gpt->ents, start);
if (!end)
FDISK_INIT_UNDEF(end);
}
if (!FDISK_IS_UNDEF(start))
e->lba_start = cpu_to_le64(start);
if (!FDISK_IS_UNDEF(end))
e->lba_end = cpu_to_le64(end);
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
fdisk_label_set_changed(cxt->label, 1);
return rc;
}
/*
* List label partitions.
*/
static int gpt_list_disklabel(struct fdisk_context *cxt)
{
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
if (fdisk_is_details(cxt)) {
struct gpt_header *h = self_label(cxt)->pheader;
fdisk_info(cxt, _("First LBA: %ju"), h->first_usable_lba);
fdisk_info(cxt, _("Last LBA: %ju"), h->last_usable_lba);
/* TRANSLATORS: The LBA (Logical Block Address) of the backup GPT header. */
fdisk_info(cxt, _("Alternative LBA: %ju"), h->alternative_lba);
/* TRANSLATORS: The start of the array of partition entries. */
fdisk_info(cxt, _("Partition entries LBA: %ju"), h->partition_entry_lba);
fdisk_info(cxt, _("Allocated partition entries: %u"), h->npartition_entries);
}
return 0;
}
/*
* 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 *ents)
{
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, ents, 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;
assert(cxt);
assert(cxt->firstsector);
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)
{
struct fdisk_gpt_label *gpt;
int mbr_type;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
mbr_type = valid_pmbr(cxt);
/* check that disk is big enough to handle the backup header */
if (le64_to_cpu(gpt->pheader->alternative_lba) > cxt->total_sectors)
goto err0;
/* check that the backup header is properly placed */
if (le64_to_cpu(gpt->pheader->alternative_lba) < cxt->total_sectors - 1)
/* TODO: correct this (with user authorization) and write */
goto err0;
if (check_overlap_partitions(gpt->pheader, gpt->ents))
goto err0;
/* recompute CRCs for both headers */
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->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, gpt->bheader, gpt->ents) != 0)
goto err1;
if (gpt_write_header(cxt, gpt->bheader,
le64_to_cpu(gpt->pheader->alternative_lba)) != 0)
goto err1;
if (gpt_write_partitions(cxt, gpt->pheader, gpt->ents) != 0)
goto err1;
if (gpt_write_header(cxt, gpt->pheader, GPT_PRIMARY_PARTITION_TABLE_LBA) != 0)
goto err1;
if (mbr_type == GPT_MBR_HYBRID)
fdisk_warnx(cxt, _("The device contains hybrid MBR -- writing GPT only. "
"You have to sync the MBR manually."));
else if (gpt_write_pmbr(cxt) != 0)
goto err1;
DBG(LABEL, ul_debug("GPT write success"));
return 0;
err0:
DBG(LABEL, ul_debug("GPT write failed: incorrect input"));
errno = EINVAL;
return -EINVAL;
err1:
DBG(LABEL, ul_debug("GPT write failed: %m"));
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;
unsigned int ptnum;
struct fdisk_gpt_label *gpt;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if (!gpt || !gpt->bheader) {
nerror++;
fdisk_warnx(cxt, _("Disk does not contain a valid backup header."));
}
if (!gpt_check_header_crc(gpt->pheader, gpt->ents)) {
nerror++;
fdisk_warnx(cxt, _("Invalid primary header CRC checksum."));
}
if (gpt->bheader && !gpt_check_header_crc(gpt->bheader, gpt->ents)) {
nerror++;
fdisk_warnx(cxt, _("Invalid backup header CRC checksum."));
}
if (!gpt_check_entryarr_crc(gpt->pheader, gpt->ents)) {
nerror++;
fdisk_warnx(cxt, _("Invalid partition entry checksum."));
}
if (!gpt_check_lba_sanity(cxt, gpt->pheader)) {
nerror++;
fdisk_warnx(cxt, _("Invalid primary header LBA sanity checks."));
}
if (gpt->bheader && !gpt_check_lba_sanity(cxt, gpt->bheader)) {
nerror++;
fdisk_warnx(cxt, _("Invalid backup header LBA sanity checks."));
}
if (le64_to_cpu(gpt->pheader->my_lba) != GPT_PRIMARY_PARTITION_TABLE_LBA) {
nerror++;
fdisk_warnx(cxt, _("MyLBA mismatch with real position at primary header."));
}
if (gpt->bheader && le64_to_cpu(gpt->bheader->my_lba) != last_lba(cxt)) {
nerror++;
fdisk_warnx(cxt, _("MyLBA mismatch with real position at backup header."));
}
if (le64_to_cpu(gpt->pheader->alternative_lba) >= cxt->total_sectors) {
nerror++;
fdisk_warnx(cxt, _("Disk is too small to hold all data."));
}
/*
* if the GPT is the primary table, check the alternateLBA
* to see if it is a valid GPT
*/
if (gpt->bheader && (le64_to_cpu(gpt->pheader->my_lba) !=
le64_to_cpu(gpt->bheader->alternative_lba))) {
nerror++;
fdisk_warnx(cxt, _("Primary and backup header mismatch."));
}
ptnum = check_overlap_partitions(gpt->pheader, gpt->ents);
if (ptnum) {
nerror++;
fdisk_warnx(cxt, _("Partition %u overlaps with partition %u."),
ptnum, ptnum+1);
}
ptnum = check_too_big_partitions(gpt->pheader, gpt->ents, cxt->total_sectors);
if (ptnum) {
nerror++;
fdisk_warnx(cxt, _("Partition %u is too big for the disk."),
ptnum);
}
ptnum = check_start_after_end_paritions(gpt->pheader, gpt->ents);
if (ptnum) {
nerror++;
fdisk_warnx(cxt, _("Partition %u ends before it starts."),
ptnum);
}
if (!nerror) { /* yay :-) */
uint32_t nsegments = 0;
uint64_t free_sectors = 0, largest_segment = 0;
char *strsz = NULL;
fdisk_info(cxt, _("No errors detected."));
fdisk_info(cxt, _("Header version: %s"), gpt_get_header_revstr(gpt->pheader));
fdisk_info(cxt, _("Using %u out of %d partitions."),
partitions_in_use(gpt->pheader, gpt->ents),
le32_to_cpu(gpt->pheader->npartition_entries));
free_sectors = get_free_sectors(cxt, gpt->pheader, gpt->ents,
&nsegments, &largest_segment);
if (largest_segment)
strsz = size_to_human_string(SIZE_SUFFIX_SPACE | SIZE_SUFFIX_3LETTER,
largest_segment * cxt->sector_size);
fdisk_info(cxt,
P_("A total of %ju free sectors is available in %u segment.",
"A total of %ju free sectors is available in %u segments "
"(the largest is %s).", nsegments),
free_sectors, nsegments, strsz);
free(strsz);
} else
fdisk_warnx(cxt,
P_("%d error detected.", "%d errors detected.", nerror),
nerror);
return 0;
}
/* Delete a single GPT partition, specified by partnum. */
static int gpt_delete_partition(struct fdisk_context *cxt,
size_t partnum)
{
struct fdisk_gpt_label *gpt;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if (partnum >= cxt->label->nparts_max
|| partition_unused(&gpt->ents[partnum]))
return -EINVAL;
/* hasta la vista, baby! */
memset(&gpt->ents[partnum], 0, sizeof(struct gpt_entry));
if (!partition_unused(&gpt->ents[partnum]))
return -EINVAL;
else {
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
cxt->label->nparts_cur--;
fdisk_label_set_changed(cxt->label, 1);
}
return 0;
}
/* Performs logical checks to add a new partition entry */
static int gpt_add_partition(
struct fdisk_context *cxt,
struct fdisk_partition *pa,
size_t *partno)
{
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 typeid;
struct fdisk_gpt_label *gpt;
struct gpt_header *pheader;
struct gpt_entry *e, *ents;
struct fdisk_ask *ask = NULL;
size_t partnum;
int rc;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
pheader = gpt->pheader;
ents = gpt->ents;
rc = fdisk_partition_next_partno(pa, cxt, &partnum);
if (rc) {
DBG(LABEL, ul_debug("GPT failed to get next partno"));
return rc;
}
if (!partition_unused(&ents[partnum])) {
fdisk_warnx(cxt, _("Partition %zu is already defined. "
"Delete it before re-adding it."), partnum +1);
return -ERANGE;
}
if (le32_to_cpu(pheader->npartition_entries) ==
partitions_in_use(pheader, ents)) {
fdisk_warnx(cxt, _("All partitions are already in use."));
return -ENOSPC;
}
if (!get_free_sectors(cxt, pheader, ents, NULL, NULL)) {
fdisk_warnx(cxt, _("No free sectors available."));
return -ENOSPC;
}
string_to_guid(pa && pa->type && pa->type->typestr ?
pa->type->typestr:
GPT_DEFAULT_ENTRY_TYPE, &typeid);
disk_f = find_first_available(pheader, ents, pheader->first_usable_lba);
/* if first sector no explicitly defined then ignore small gaps before
* the first partition */
if ((!pa || !fdisk_partition_has_start(pa))
&& !partition_unused(&ents[0])
&& disk_f < gpt_partition_start(&ents[0])) {
do {
uint64_t x;
DBG(LABEL, ul_debug("testing first sector %ju", disk_f));
disk_f = find_first_available(pheader, ents, disk_f);
if (!disk_f)
break;
x = find_last_free(pheader, ents, disk_f);
if (x - disk_f >= cxt->grain / cxt->sector_size)
break;
DBG(LABEL, ul_debug("first sector %ju addresses to small space, continue...", disk_f));
disk_f = x + 1;
} while(1);
if (disk_f == 0)
disk_f = find_first_available(pheader, ents, pheader->first_usable_lba);
}
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,dflt_l>*/
dflt_f = fdisk_align_lba_in_range(cxt, dflt_f, dflt_f, dflt_l);
/* first sector */
if (pa && pa->start_follow_default) {
user_f = dflt_f;
} else if (pa && fdisk_partition_has_start(pa)) {
DBG(LABEL, ul_debug("first sector defined: %ju", pa->start));
if (pa->start != find_first_available(pheader, ents, pa->start)) {
fdisk_warnx(cxt, _("Sector %ju already used."), pa->start);
return -ERANGE;
}
user_f = pa->start;
} else {
/* ask by dialog */
for (;;) {
if (!ask)
ask = fdisk_new_ask();
else
fdisk_reset_ask(ask);
/* First sector */
fdisk_ask_set_query(ask, _("First sector"));
fdisk_ask_set_type(ask, FDISK_ASKTYPE_NUMBER);
fdisk_ask_number_set_low(ask, disk_f); /* minimal */
fdisk_ask_number_set_default(ask, dflt_f); /* default */
fdisk_ask_number_set_high(ask, disk_l); /* maximal */
rc = fdisk_do_ask(cxt, ask);
if (rc)
goto done;
user_f = fdisk_ask_number_get_result(ask);
if (user_f != find_first_available(pheader, ents, user_f)) {
fdisk_warnx(cxt, _("Sector %ju already used."), user_f);
continue;
}
break;
}
}
/* Last sector */
dflt_l = find_last_free(pheader, ents, user_f);
if (pa && pa->end_follow_default) {
user_l = dflt_l;
} else if (pa && fdisk_partition_has_size(pa)) {
user_l = user_f + pa->size - 1;
DBG(LABEL, ul_debug("size defined: %ju, end: %ju (last possible: %ju)",
pa->size, user_l, dflt_l));
if (user_l != dflt_l && !pa->size_explicit)
user_l = fdisk_align_lba_in_range(cxt, user_l, user_f, dflt_l) - 1;
} else {
for (;;) {
if (!ask)
ask = fdisk_new_ask();
else
fdisk_reset_ask(ask);
fdisk_ask_set_query(ask, _("Last sector, +sectors or +size{K,M,G,T,P}"));
fdisk_ask_set_type(ask, FDISK_ASKTYPE_OFFSET);
fdisk_ask_number_set_low(ask, user_f); /* minimal */
fdisk_ask_number_set_default(ask, dflt_l); /* default */
fdisk_ask_number_set_high(ask, dflt_l); /* maximal */
fdisk_ask_number_set_base(ask, user_f); /* base for relative input */
fdisk_ask_number_set_unit(ask, cxt->sector_size);
rc = fdisk_do_ask(cxt, ask);
if (rc)
goto done;
user_l = fdisk_ask_number_get_result(ask);
if (fdisk_ask_number_is_relative(ask)) {
user_l = fdisk_align_lba_in_range(cxt, user_l, user_f, dflt_l) - 1;
/* no space for anything useful, use all space
if (user_l + (cxt->grain / cxt->sector_size) > dflt_l)
user_l = dflt_l;
*/
}
if (user_l > user_f && user_l <= disk_l)
break;
}
}
if (user_f > user_l || partnum >= cxt->label->nparts_max) {
fdisk_warnx(cxt, _("Could not create partition %zu"), partnum + 1);
rc = -EINVAL;
goto done;
}
assert(!FDISK_IS_UNDEF(user_l));
assert(!FDISK_IS_UNDEF(user_f));
e = &ents[partnum];
e->lba_end = cpu_to_le64(user_l);
e->lba_start = cpu_to_le64(user_f);
gpt_entry_set_type(e, &typeid);
if (pa && pa->uuid) {
/* Sometimes it's necessary to create a copy of the PT and
* reuse already defined UUID
*/
rc = gpt_entry_set_uuid(e, pa->uuid);
if (rc)
goto done;
} else {
/* 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->partition_guid);
swap_efi_guid(&e->partition_guid);
}
if (pa && pa->name && *pa->name)
gpt_entry_set_name(e, pa->name);
if (pa && pa->attrs)
gpt_entry_attrs_from_string(cxt, e, pa->attrs);
DBG(LABEL, ul_debug("GPT new partition: partno=%zu, start=%ju, end=%ju, size=%ju",
partnum,
gpt_partition_start(e),
gpt_partition_end(e),
gpt_partition_size(e)));
gpt_recompute_crc(gpt->pheader, ents);
gpt_recompute_crc(gpt->bheader, ents);
/* report result */
{
struct fdisk_parttype *t;
cxt->label->nparts_cur++;
fdisk_label_set_changed(cxt->label, 1);
t = gpt_partition_parttype(cxt, &ents[partnum]);
fdisk_info_new_partition(cxt, partnum + 1, user_f, user_l, t);
fdisk_unref_parttype(t);
}
rc = 0;
if (partno)
*partno = partnum;
done:
fdisk_unref_ask(ask);
return rc;
}
/*
* Create a new GPT disklabel - destroys any previous data.
*/
static int gpt_create_disklabel(struct fdisk_context *cxt)
{
int rc = 0;
ssize_t esz = 0;
char str[37];
struct fdisk_gpt_label *gpt;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
/* label private stuff has to be empty, see gpt_deinit() */
assert(gpt->pheader == NULL);
assert(gpt->bheader == NULL);
/*
* 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.
*/
rc = gpt_mknew_pmbr(cxt);
if (rc < 0)
goto done;
/* primary */
gpt->pheader = calloc(1, sizeof(*gpt->pheader));
if (!gpt->pheader) {
rc = -ENOMEM;
goto done;
}
rc = gpt_mknew_header(cxt, gpt->pheader, GPT_PRIMARY_PARTITION_TABLE_LBA);
if (rc < 0)
goto done;
/* backup ("copy" primary) */
gpt->bheader = calloc(1, sizeof(*gpt->bheader));
if (!gpt->bheader) {
rc = -ENOMEM;
goto done;
}
rc = gpt_mknew_header_from_bkp(cxt, gpt->bheader,
last_lba(cxt), gpt->pheader);
if (rc < 0)
goto done;
esz = le32_to_cpu(gpt->pheader->npartition_entries) *
le32_to_cpu(gpt->pheader->sizeof_partition_entry);
gpt->ents = calloc(1, esz);
if (!gpt->ents) {
rc = -ENOMEM;
goto done;
}
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
cxt->label->nparts_max = le32_to_cpu(gpt->pheader->npartition_entries);
cxt->label->nparts_cur = 0;
guid_to_string(&gpt->pheader->disk_guid, str);
fdisk_label_set_changed(cxt->label, 1);
fdisk_info(cxt, _("Created a new GPT disklabel (GUID: %s)."), str);
done:
return rc;
}
static int gpt_get_disklabel_id(struct fdisk_context *cxt, char **id)
{
struct fdisk_gpt_label *gpt;
char str[37];
assert(cxt);
assert(id);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
guid_to_string(&gpt->pheader->disk_guid, str);
*id = strdup(str);
if (!*id)
return -ENOMEM;
return 0;
}
static int gpt_set_disklabel_id(struct fdisk_context *cxt)
{
struct fdisk_gpt_label *gpt;
struct gpt_guid uuid;
char *str, *old, *new;
int rc;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if (fdisk_ask_string(cxt,
_("Enter new disk UUID (in 8-4-4-4-12 format)"), &str))
return -EINVAL;
rc = string_to_guid(str, &uuid);
free(str);
if (rc) {
fdisk_warnx(cxt, _("Failed to parse your UUID."));
return rc;
}
gpt_get_disklabel_id(cxt, &old);
gpt->pheader->disk_guid = uuid;
gpt->bheader->disk_guid = uuid;
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
gpt_get_disklabel_id(cxt, &new);
fdisk_info(cxt, _("Disk identifier changed from %s to %s."), old, new);
free(old);
free(new);
fdisk_label_set_changed(cxt->label, 1);
return 0;
}
static int gpt_part_is_used(struct fdisk_context *cxt, size_t i)
{
struct fdisk_gpt_label *gpt;
struct gpt_entry *e;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
if ((uint32_t) i >= le32_to_cpu(gpt->pheader->npartition_entries))
return 0;
e = &gpt->ents[i];
return !partition_unused(e) || gpt_partition_start(e);
}
/**
* fdisk_gpt_is_hybrid:
* @cxt: context
*
* The regular GPT contains PMBR (dummy protective MBR) where the protective
* MBR does not address any partitions.
*
* Hybrid GPT contains regular MBR where this partition table addresses the
* same partitions as GPT. It's recommended to not use hybrid GPT due to MBR
* limits.
*
* The libfdisk does not provide functionality to sync GPT and MBR, you have to
* directly access and modify (P)MBR (see fdisk_new_nested_context()).
*
* Returns: 1 if partition table detected as hybrid otherwise return 0
*/
int fdisk_gpt_is_hybrid(struct fdisk_context *cxt)
{
assert(cxt);
return valid_pmbr(cxt) == GPT_MBR_HYBRID;
}
static int gpt_toggle_partition_flag(
struct fdisk_context *cxt,
size_t i,
unsigned long flag)
{
struct fdisk_gpt_label *gpt;
uint64_t attrs, tmp;
char *bits;
const char *name = NULL;
int bit = -1, rc;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
DBG(LABEL, ul_debug("GPT entry attribute change requested partno=%zu", i));
gpt = self_label(cxt);
if ((uint32_t) i >= le32_to_cpu(gpt->pheader->npartition_entries))
return -EINVAL;
attrs = le64_to_cpu(gpt->ents[i].attrs);
bits = (char *) &attrs;
switch (flag) {
case GPT_FLAG_REQUIRED:
bit = GPT_ATTRBIT_REQ;
name = GPT_ATTRSTR_REQ;
break;
case GPT_FLAG_NOBLOCK:
bit = GPT_ATTRBIT_NOBLOCK;
name = GPT_ATTRSTR_NOBLOCK;
break;
case GPT_FLAG_LEGACYBOOT:
bit = GPT_ATTRBIT_LEGACY;
name = GPT_ATTRSTR_LEGACY;
break;
case GPT_FLAG_GUIDSPECIFIC:
rc = fdisk_ask_number(cxt, 48, 48, 63, _("Enter GUID specific bit"), &tmp);
if (rc)
return rc;
bit = tmp;
break;
default:
/* already specified PT_FLAG_GUIDSPECIFIC bit */
if (flag >= 48 && flag <= 63) {
bit = flag;
flag = GPT_FLAG_GUIDSPECIFIC;
}
break;
}
if (bit < 0) {
fdisk_warnx(cxt, _("failed to toggle unsupported bit %lu"), flag);
return -EINVAL;
}
if (!isset(bits, bit))
setbit(bits, bit);
else
clrbit(bits, bit);
gpt->ents[i].attrs = cpu_to_le64(attrs);
if (flag == GPT_FLAG_GUIDSPECIFIC)
fdisk_info(cxt, isset(bits, bit) ?
_("The GUID specific bit %d on partition %zu is enabled now.") :
_("The GUID specific bit %d on partition %zu is disabled now."),
bit, i + 1);
else
fdisk_info(cxt, isset(bits, bit) ?
_("The %s flag on partition %zu is enabled now.") :
_("The %s flag on partition %zu is disabled now."),
name, i + 1);
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
fdisk_label_set_changed(cxt->label, 1);
return 0;
}
static int gpt_entry_cmp_start(const void *a, const void *b)
{
struct gpt_entry *ae = (struct gpt_entry *) a,
*be = (struct gpt_entry *) b;
int au = partition_unused(ae),
bu = partition_unused(be);
if (au && bu)
return 0;
if (au)
return 1;
if (bu)
return -1;
return cmp_numbers(gpt_partition_start(ae), gpt_partition_start(be));
}
/* sort partition by start sector */
static int gpt_reorder(struct fdisk_context *cxt)
{
struct fdisk_gpt_label *gpt;
size_t nparts;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
nparts = le32_to_cpu(gpt->pheader->npartition_entries);
qsort(gpt->ents, nparts, sizeof(struct gpt_entry),
gpt_entry_cmp_start);
gpt_recompute_crc(gpt->pheader, gpt->ents);
gpt_recompute_crc(gpt->bheader, gpt->ents);
fdisk_label_set_changed(cxt->label, 1);
fdisk_info(cxt, _("Done."));
return 0;
}
static int gpt_reset_alignment(struct fdisk_context *cxt)
{
struct fdisk_gpt_label *gpt;
struct gpt_header *h;
assert(cxt);
assert(cxt->label);
assert(fdisk_is_label(cxt, GPT));
gpt = self_label(cxt);
h = gpt ? gpt->pheader : NULL;
if (h) {
/* always follow existing table */
cxt->first_lba = h->first_usable_lba;
cxt->last_lba = h->last_usable_lba;
} else {
/* estimate ranges for GPT */
uint64_t first, last;
count_first_last_lba(cxt, &first, &last);
if (cxt->first_lba < first)
cxt->first_lba = first;
if (cxt->last_lba > last)
cxt->last_lba = last;
}
return 0;
}
/*
* Deinitialize fdisk-specific variables
*/
static void gpt_deinit(struct fdisk_label *lb)
{
struct fdisk_gpt_label *gpt = (struct fdisk_gpt_label *) lb;
if (!gpt)
return;
free(gpt->ents);
free(gpt->pheader);
free(gpt->bheader);
gpt->ents = NULL;
gpt->pheader = NULL;
gpt->bheader = NULL;
}
static const struct fdisk_label_operations gpt_operations =
{
.probe = gpt_probe_label,
.write = gpt_write_disklabel,
.verify = gpt_verify_disklabel,
.create = gpt_create_disklabel,
.list = gpt_list_disklabel,
.locate = gpt_locate_disklabel,
.reorder = gpt_reorder,
.get_id = gpt_get_disklabel_id,
.set_id = gpt_set_disklabel_id,
.get_part = gpt_get_partition,
.set_part = gpt_set_partition,
.add_part = gpt_add_partition,
.del_part = gpt_delete_partition,
.part_is_used = gpt_part_is_used,
.part_toggle_flag = gpt_toggle_partition_flag,
.deinit = gpt_deinit,
.reset_alignment = gpt_reset_alignment
};
static const struct fdisk_field gpt_fields[] =
{
/* basic */
{ FDISK_FIELD_DEVICE, N_("Device"), 10, 0 },
{ FDISK_FIELD_START, N_("Start"), 5, FDISK_FIELDFL_NUMBER },
{ FDISK_FIELD_END, N_("End"), 5, FDISK_FIELDFL_NUMBER },
{ FDISK_FIELD_SECTORS, N_("Sectors"), 5, FDISK_FIELDFL_NUMBER },
{ FDISK_FIELD_SIZE, N_("Size"), 5, FDISK_FIELDFL_NUMBER | FDISK_FIELDFL_EYECANDY },
{ FDISK_FIELD_TYPE, N_("Type"), 0.1, FDISK_FIELDFL_EYECANDY },
/* expert */
{ FDISK_FIELD_TYPEID, N_("Type-UUID"), 36, FDISK_FIELDFL_DETAIL },
{ FDISK_FIELD_UUID, N_("UUID"), 36, FDISK_FIELDFL_DETAIL },
{ FDISK_FIELD_NAME, N_("Name"), 0.2, FDISK_FIELDFL_DETAIL },
{ FDISK_FIELD_ATTR, N_("Attrs"), 0, FDISK_FIELDFL_DETAIL }
};
/*
* allocates GPT in-memory stuff
*/
struct fdisk_label *fdisk_new_gpt_label(struct fdisk_context *cxt)
{
struct fdisk_label *lb;
struct fdisk_gpt_label *gpt;
assert(cxt);
gpt = calloc(1, sizeof(*gpt));
if (!gpt)
return NULL;
/* initialize generic part of the driver */
lb = (struct fdisk_label *) gpt;
lb->name = "gpt";
lb->id = FDISK_DISKLABEL_GPT;
lb->op = &gpt_operations;
lb->parttypes = gpt_parttypes;
lb->nparttypes = ARRAY_SIZE(gpt_parttypes);
lb->fields = gpt_fields;
lb->nfields = ARRAY_SIZE(gpt_fields);
return lb;
}