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fdisk: initial stab at GPT partition support

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Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Kevin Cernekee 2010-10-25 02:00:24 +02:00 committed by Denys Vlasenko
parent 3b060528a2
commit ccb070450e
5 changed files with 275 additions and 26 deletions
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7
include/libbb.h
View File

@ -746,7 +746,7 @@ char *itoa(int n) FAST_FUNC;
char *utoa_to_buf(unsigned n, char *buf, unsigned buflen) FAST_FUNC;
char *itoa_to_buf(int n, char *buf, unsigned buflen) FAST_FUNC;
/* Intelligent formatters of bignums */
void smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
void smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale) FAST_FUNC;
void smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
/* If block_size == 0, display size without fractional part,
* else display (size * block_size) with one decimal digit.
@ -1543,7 +1543,10 @@ void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
void sha512_hash(sha512_ctx_t *ctx, const void *buffer, size_t len) FAST_FUNC;
void sha512_end(sha512_ctx_t *ctx, void *resbuf) FAST_FUNC;
/* TODO: add global crc32_table pointer and create
* LE and BE functions to calculate crc32 over given bytes.
* Currently we have about five reimplementations...
*/
uint32_t *crc32_filltable(uint32_t *tbl256, int endian) FAST_FUNC;
typedef struct masks_labels_t {

4
libbb/human_readable.c
View File

@ -94,7 +94,7 @@ const char* FAST_FUNC make_human_readable_str(unsigned long long val,
/* Convert unsigned long long value into compact 5-char representation.
* String is not terminated (buf[5] is untouched) */
void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale)
{
const char *fmt;
char c;
@ -150,7 +150,7 @@ void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *sca
/* Convert unsigned long long value into compact 4-char
* representation. Examples: "1234", "1.2k", " 27M", "123T"
* String is not terminated (buf[4] is untouched) */
void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale)
{
const char *fmt;
char c;

8
util-linux/Config.src
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@ -181,6 +181,14 @@ config FEATURE_OSF_LABEL
Enabling this option allows you to create or change BSD disklabels
and define and edit BSD disk slices.
config FEATURE_GPT_LABEL
bool "Support GPT disklabels"
default n
depends on FDISK && FEATURE_FDISK_WRITABLE
help
Enabling this option allows you to view GUID Partition Table
disklabels.
config FEATURE_FDISK_ADVANCED
bool "Support expert mode"
default y

79
util-linux/fdisk.c
View File

@ -107,12 +107,30 @@ struct partition {
unsigned char size4[4]; /* nr of sectors in partition */
} PACKED;
/*
* per partition table entry data
*
* The four primary partitions have the same sectorbuffer (MBRbuffer)
* and have NULL ext_pointer.
* Each logical partition table entry has two pointers, one for the
* partition and one link to the next one.
*/
struct pte {
struct partition *part_table; /* points into sectorbuffer */
struct partition *ext_pointer; /* points into sectorbuffer */
sector_t offset_from_dev_start; /* disk sector number */
char *sectorbuffer; /* disk sector contents */
#if ENABLE_FEATURE_FDISK_WRITABLE
char changed; /* boolean */
#endif
};
#define unable_to_open "can't open '%s'"
#define unable_to_read "can't read from %s"
#define unable_to_seek "can't seek on %s"
enum label_type {
LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF
LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF, LABEL_GPT
};
#define LABEL_IS_DOS (LABEL_DOS == current_label_type)
@ -149,6 +167,14 @@ enum label_type {
#define STATIC_OSF extern
#endif
#if ENABLE_FEATURE_GPT_LABEL
#define LABEL_IS_GPT (LABEL_GPT == current_label_type)
#define STATIC_GPT static
#else
#define LABEL_IS_GPT 0
#define STATIC_GPT extern
#endif
enum action { OPEN_MAIN, TRY_ONLY, CREATE_EMPTY_DOS, CREATE_EMPTY_SUN };
static void update_units(void);
@ -162,6 +188,7 @@ static sector_t read_int(sector_t low, sector_t dflt, sector_t high, sector_t ba
#endif
static const char *partition_type(unsigned char type);
static void get_geometry(void);
static void read_pte(struct pte *pe, sector_t offset);
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what);
#else
@ -174,24 +201,6 @@ static int get_boot(void);
static sector_t get_start_sect(const struct partition *p);
static sector_t get_nr_sects(const struct partition *p);
/*
* per partition table entry data
*
* The four primary partitions have the same sectorbuffer (MBRbuffer)
* and have NULL ext_pointer.
* Each logical partition table entry has two pointers, one for the
* partition and one link to the next one.
*/
struct pte {
struct partition *part_table; /* points into sectorbuffer */
struct partition *ext_pointer; /* points into sectorbuffer */
sector_t offset_from_dev_start; /* disk sector number */
char *sectorbuffer; /* disk sector contents */
#if ENABLE_FEATURE_FDISK_WRITABLE
char changed; /* boolean */
#endif
};
/* DOS partition types */
static const char *const i386_sys_types[] = {
@ -653,6 +662,8 @@ STATIC_OSF void bsd_select(void);
STATIC_OSF void xbsd_print_disklabel(int);
#include "fdisk_osf.c"
#include "fdisk_gpt.c"
#if ENABLE_FEATURE_SGI_LABEL || ENABLE_FEATURE_SUN_LABEL
static uint16_t
fdisk_swap16(uint16_t x)
@ -833,6 +844,11 @@ menu(void)
puts("o\tcreate a new empty DOS partition table");
puts("q\tquit without saving changes");
puts("s\tcreate a new empty Sun disklabel"); /* sun */
} else if (LABEL_IS_GPT) {
puts("o\tcreate a new empty DOS partition table");
puts("p\tprint the partition table");
puts("q\tquit without saving changes");
puts("s\tcreate a new empty Sun disklabel"); /* sun */
} else {
puts("a\ttoggle a bootable flag");
puts("b\tedit bsd disklabel");
@ -1308,7 +1324,18 @@ get_geometry(void)
/*
* Opens disk_device and optionally reads MBR.
* FIXME: document what each 'what' value will do!
* If what == OPEN_MAIN:
* Open device, read MBR. Abort program on short read. Create empty
* disklabel if the on-disk structure is invalid (WRITABLE mode).
* If what == TRY_ONLY:
* Open device, read MBR. Return an error if anything is out of place.
* Do not create an empty disklabel. This is used for the "list"
* operations: "fdisk -l /dev/sda" and "fdisk -l" (all devices).
* If what == CREATE_EMPTY_*:
* This means that get_boot() was called recursively from create_*label().
* Do not re-open the device; just set up the ptes array and print
* geometry warnings.
*
* Returns:
* -1: no 0xaa55 flag present (possibly entire disk BSD)
* 0: found or created label
@ -1390,6 +1417,10 @@ static int get_boot(void)
if (check_aix_label())
return 0;
#endif
#if ENABLE_FEATURE_GPT_LABEL
if (check_gpt_label())
return 0;
#endif
#if ENABLE_FEATURE_OSF_LABEL
if (check_osf_label()) {
possibly_osf_label = 1;
@ -1409,7 +1440,7 @@ static int get_boot(void)
if (!valid_part_table_flag(MBRbuffer)) {
if (what == OPEN_MAIN) {
printf("Device contains neither a valid DOS "
"partition table, nor Sun, SGI or OSF "
"partition table, nor Sun, SGI, OSF or GPT "
"disklabel\n");
#ifdef __sparc__
IF_FEATURE_SUN_LABEL(create_sunlabel();)
@ -2056,10 +2087,14 @@ list_table(int xtra)
sun_list_table(xtra);
return;
}
if (LABEL_IS_SUN) {
if (LABEL_IS_SGI) {
sgi_list_table(xtra);
return;
}
if (LABEL_IS_GPT) {
gpt_list_table(xtra);
return;
}
list_disk_geometry();

203
util-linux/fdisk_gpt.c Normal file
View File

@ -0,0 +1,203 @@
#if ENABLE_FEATURE_GPT_LABEL
/*
* Copyright (C) 2010 Kevin Cernekee <cernekee@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#define GPT_MAGIC 0x5452415020494645ULL
enum {
LEGACY_GPT_TYPE = 0xee,
GPT_MAX_PARTS = 256,
GPT_MAX_PART_ENTRY_LEN = 4096,
GUID_LEN = 16,
};
typedef struct {
uint64_t magic;
uint32_t revision;
uint32_t hdr_size;
uint32_t hdr_crc32;
uint32_t reserved;
uint64_t current_lba;
uint64_t backup_lba;
uint64_t first_usable_lba;
uint64_t last_usable_lba;
uint8_t disk_guid[GUID_LEN];
uint64_t first_part_lba;
uint32_t n_parts;
uint32_t part_entry_len;
uint32_t part_array_crc32;
} gpt_header;
typedef struct {
uint8_t type_guid[GUID_LEN];
uint8_t part_guid[GUID_LEN];
uint64_t lba_start;
uint64_t lba_end;
uint64_t flags;
uint16_t name[36];
} gpt_partition;
static gpt_header *gpt_hdr;
static char *part_array;
static unsigned int n_parts;
static unsigned int part_array_len;
static unsigned int part_entry_len;
static uint32_t *crc32_table;
static inline gpt_partition *
gpt_part(int i)
{
if (i >= n_parts) {
return NULL;
}
return (gpt_partition *)&part_array[i * part_entry_len];
}
/* TODO: move to libbb */
static uint32_t
gpt_crc32(void *buf, int len)
{
uint32_t crc = 0xffffffff;
for (; len > 0; len--, buf++) {
crc = crc32_table[(crc ^ *((char *)buf)) & 0xff] ^ (crc >> 8);
}
return crc ^ 0xffffffff;
}
static void
gpt_print_guid(uint8_t *buf)
{
printf(
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
buf[3], buf[2], buf[1], buf[0],
buf[5], buf[4],
buf[7], buf[6],
buf[8], buf[9],
buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
}
/* TODO: real unicode support */
static void
gpt_print_wide(uint16_t *s, int max_len)
{
int i = 0;
while (i < max_len) {
if (*s == 0)
return;
fputc(*s, stdout);
s++;
}
}
static void
gpt_list_table(int xtra UNUSED_PARAM)
{
int i;
char numstr6[6];
numstr6[5] = '\0';
smart_ulltoa5(total_number_of_sectors, numstr6, " KMGTPEZY");
printf("Disk %s: %llu sectors, %s\n", disk_device,
(unsigned long long)total_number_of_sectors,
numstr6);
printf("Logical sector size: %u\n", sector_size);
printf("Disk identifier (GUID): ");
gpt_print_guid(gpt_hdr->disk_guid);
printf("\nPartition table holds up to %u entries\n",
(int)SWAP_LE32(gpt_hdr->n_parts));
printf("First usable sector is %llu, last usable sector is %llu\n\n",
(unsigned long long)SWAP_LE64(gpt_hdr->first_usable_lba),
(unsigned long long)SWAP_LE64(gpt_hdr->last_usable_lba));
printf("Number Start (sector) End (sector) Size Code Name\n");
for (i = 0; i < n_parts; i++) {
gpt_partition *p = gpt_part(i);
if (p->lba_start) {
smart_ulltoa5(1 + SWAP_LE64(p->lba_end) - SWAP_LE64(p->lba_start),
numstr6, " KMGTPEZY");
printf("%4u %15llu %15llu %11s %04x ",
i + 1,
(unsigned long long)SWAP_LE64(p->lba_start),
(unsigned long long)SWAP_LE64(p->lba_end),
numstr6,
0x0700 /* FIXME */);
gpt_print_wide(p->name, 18);
printf("\n");
}
}
}
static int
check_gpt_label(void)
{
struct partition *first = pt_offset(MBRbuffer, 0);
struct pte pe;
uint32_t crc;
/* LBA 0 contains the legacy MBR */
if (!valid_part_table_flag(MBRbuffer)
|| first->sys_ind != LEGACY_GPT_TYPE
) {
current_label_type = 0;
return 0;
}
/* LBA 1 contains the GPT header */
read_pte(&pe, 1);
gpt_hdr = (void *)pe.sectorbuffer;
if (gpt_hdr->magic != SWAP_LE64(GPT_MAGIC)) {
current_label_type = 0;
return 0;
}
if (!crc32_table) {
crc32_table = crc32_filltable(NULL, 0);
}
crc = SWAP_LE32(gpt_hdr->hdr_crc32);
gpt_hdr->hdr_crc32 = 0;
if (gpt_crc32(gpt_hdr, SWAP_LE32(gpt_hdr->hdr_size)) != crc) {
/* FIXME: read the backup table */
puts("\nwarning: GPT header CRC is invalid\n");
}
n_parts = SWAP_LE32(gpt_hdr->n_parts);
part_entry_len = SWAP_LE32(gpt_hdr->part_entry_len);
if (n_parts > GPT_MAX_PARTS
|| part_entry_len > GPT_MAX_PART_ENTRY_LEN
|| SWAP_LE32(gpt_hdr->hdr_size) > sector_size
) {
puts("\nwarning: unable to parse GPT disklabel\n");
current_label_type = 0;
return 0;
}
part_array_len = n_parts * part_entry_len;
part_array = xmalloc(part_array_len);
seek_sector(SWAP_LE64(gpt_hdr->first_part_lba));
if (full_read(dev_fd, part_array, part_array_len) != part_array_len) {
fdisk_fatal(unable_to_read);
}
if (gpt_crc32(part_array, part_array_len) != gpt_hdr->part_array_crc32) {
/* FIXME: read the backup table */
puts("\nwarning: GPT array CRC is invalid\n");
}
puts("Found valid GPT with protective MBR; using GPT\n");
current_label_type = LABEL_GPT;
return 1;
}
#endif /* GPT_LABEL */