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hush/util-linux/fdisk.c
Denys Vlasenko fcad7681f8 fdisk: make comment more clear 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-04-06 16:56:33 +02:00

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/* vi: set sw=4 ts=4: */
/* fdisk.c -- Partition table manipulator for Linux.
*
* Copyright (C) 1992 A. V. Le Blanc (LeBlanc@mcc.ac.uk)
* Copyright (C) 2001,2002 Vladimir Oleynik <dzo@simtreas.ru> (initial bb port)
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#ifndef _LARGEFILE64_SOURCE
/* For lseek64 */
# define _LARGEFILE64_SOURCE
#endif
#include <assert.h> /* assert */
#include <sys/mount.h>
#if !defined(BLKSSZGET)
# define BLKSSZGET _IO(0x12, 104)
#endif
#if !defined(BLKGETSIZE64)
# define BLKGETSIZE64 _IOR(0x12,114,size_t)
#endif
#include "libbb.h"
#if BB_LITTLE_ENDIAN
# define inline_if_little_endian ALWAYS_INLINE
#else
# define inline_if_little_endian /* nothing */
#endif
/* Looks like someone forgot to add this to config system */
#ifndef ENABLE_FEATURE_FDISK_BLKSIZE
# define ENABLE_FEATURE_FDISK_BLKSIZE 0
# define IF_FEATURE_FDISK_BLKSIZE(a)
#endif
#define DEFAULT_SECTOR_SIZE 512
#define DEFAULT_SECTOR_SIZE_STR "512"
#define MAX_SECTOR_SIZE 2048
#define SECTOR_SIZE 512 /* still used in osf/sgi/sun code */
#define MAXIMUM_PARTS 60
#define ACTIVE_FLAG 0x80
#define EXTENDED 0x05
#define WIN98_EXTENDED 0x0f
#define LINUX_PARTITION 0x81
#define LINUX_SWAP 0x82
#define LINUX_NATIVE 0x83
#define LINUX_EXTENDED 0x85
#define LINUX_LVM 0x8e
#define LINUX_RAID 0xfd
enum {
OPT_b = 1 << 0,
OPT_C = 1 << 1,
OPT_H = 1 << 2,
OPT_l = 1 << 3,
OPT_S = 1 << 4,
OPT_u = 1 << 5,
OPT_s = (1 << 6) * ENABLE_FEATURE_FDISK_BLKSIZE,
};
typedef unsigned long long ullong;
/* Used for sector numbers. Partition formats we know
* do not support more than 2^32 sectors
*/
typedef uint32_t sector_t;
#if UINT_MAX == 4294967295
# define SECT_FMT ""
#elif ULONG_MAX == 4294967295
# define SECT_FMT "l"
#else
# error Cant detect sizeof(uint32_t)
#endif
struct hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders;
unsigned long start;
};
#define HDIO_GETGEO 0x0301 /* get device geometry */
static const char msg_building_new_label[] ALIGN1 =
"Building a new %s. Changes will remain in memory only,\n"
"until you decide to write them. After that the previous content\n"
"won't be recoverable.\n\n";
static const char msg_part_already_defined[] ALIGN1 =
"Partition %u is already defined, delete it before re-adding\n";
struct partition {
unsigned char boot_ind; /* 0x80 - active */
unsigned char head; /* starting head */
unsigned char sector; /* starting sector */
unsigned char cyl; /* starting cylinder */
unsigned char sys_ind; /* what partition type */
unsigned char end_head; /* end head */
unsigned char end_sector; /* end sector */
unsigned char end_cyl; /* end cylinder */
unsigned char start4[4]; /* starting sector counting from 0 */
unsigned char size4[4]; /* nr of sectors in partition */
} PACKED;
static const char unable_to_open[] ALIGN1 = "can't open '%s'";
static const char unable_to_read[] ALIGN1 = "can't read from %s";
static const char unable_to_seek[] ALIGN1 = "can't seek on %s";
enum label_type {
LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF
};
#define LABEL_IS_DOS (LABEL_DOS == current_label_type)
#if ENABLE_FEATURE_SUN_LABEL
#define LABEL_IS_SUN (LABEL_SUN == current_label_type)
#define STATIC_SUN static
#else
#define LABEL_IS_SUN 0
#define STATIC_SUN extern
#endif
#if ENABLE_FEATURE_SGI_LABEL
#define LABEL_IS_SGI (LABEL_SGI == current_label_type)
#define STATIC_SGI static
#else
#define LABEL_IS_SGI 0
#define STATIC_SGI extern
#endif
#if ENABLE_FEATURE_AIX_LABEL
#define LABEL_IS_AIX (LABEL_AIX == current_label_type)
#define STATIC_AIX static
#else
#define LABEL_IS_AIX 0
#define STATIC_AIX extern
#endif
#if ENABLE_FEATURE_OSF_LABEL
#define LABEL_IS_OSF (LABEL_OSF == current_label_type)
#define STATIC_OSF static
#else
#define LABEL_IS_OSF 0
#define STATIC_OSF extern
#endif
enum action { OPEN_MAIN, TRY_ONLY, CREATE_EMPTY_DOS, CREATE_EMPTY_SUN };
static void update_units(void);
#if ENABLE_FEATURE_FDISK_WRITABLE
static void change_units(void);
static void reread_partition_table(int leave);
static void delete_partition(int i);
static unsigned get_partition(int warn, unsigned max);
static void list_types(const char *const *sys);
static sector_t read_int(sector_t low, sector_t dflt, sector_t high, sector_t base, const char *mesg);
#endif
static const char *partition_type(unsigned char type);
static void get_geometry(void);
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what);
#else
static int get_boot(void);
#endif
#define PLURAL 0
#define SINGULAR 1
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[] = {
"\x00" "Empty",
"\x01" "FAT12",
"\x04" "FAT16 <32M",
"\x05" "Extended", /* DOS 3.3+ extended partition */
"\x06" "FAT16", /* DOS 16-bit >=32M */
"\x07" "HPFS/NTFS", /* OS/2 IFS, eg, HPFS or NTFS or QNX */
"\x0a" "OS/2 Boot Manager",/* OS/2 Boot Manager */
"\x0b" "Win95 FAT32",
"\x0c" "Win95 FAT32 (LBA)",/* LBA really is 'Extended Int 13h' */
"\x0e" "Win95 FAT16 (LBA)",
"\x0f" "Win95 Ext'd (LBA)",
"\x11" "Hidden FAT12",
"\x12" "Compaq diagnostics",
"\x14" "Hidden FAT16 <32M",
"\x16" "Hidden FAT16",
"\x17" "Hidden HPFS/NTFS",
"\x1b" "Hidden Win95 FAT32",
"\x1c" "Hidden W95 FAT32 (LBA)",
"\x1e" "Hidden W95 FAT16 (LBA)",
"\x3c" "Part.Magic recovery",
"\x41" "PPC PReP Boot",
"\x42" "SFS",
"\x63" "GNU HURD or SysV", /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
"\x80" "Old Minix", /* Minix 1.4a and earlier */
"\x81" "Minix / old Linux",/* Minix 1.4b and later */
"\x82" "Linux swap", /* also Solaris */
"\x83" "Linux",
"\x84" "OS/2 hidden C: drive",
"\x85" "Linux extended",
"\x86" "NTFS volume set",
"\x87" "NTFS volume set",
"\x8e" "Linux LVM",
"\x9f" "BSD/OS", /* BSDI */
"\xa0" "Thinkpad hibernation",
"\xa5" "FreeBSD", /* various BSD flavours */
"\xa6" "OpenBSD",
"\xa8" "Darwin UFS",
"\xa9" "NetBSD",
"\xab" "Darwin boot",
"\xb7" "BSDI fs",
"\xb8" "BSDI swap",
"\xbe" "Solaris boot",
"\xeb" "BeOS fs",
"\xee" "EFI GPT", /* Intel EFI GUID Partition Table */
"\xef" "EFI (FAT-12/16/32)", /* Intel EFI System Partition */
"\xf0" "Linux/PA-RISC boot", /* Linux/PA-RISC boot loader */
"\xf2" "DOS secondary", /* DOS 3.3+ secondary */
"\xfd" "Linux raid autodetect", /* New (2.2.x) raid partition with
autodetect using persistent
superblock */
#if 0 /* ENABLE_WEIRD_PARTITION_TYPES */
"\x02" "XENIX root",
"\x03" "XENIX usr",
"\x08" "AIX", /* AIX boot (AIX -- PS/2 port) or SplitDrive */
"\x09" "AIX bootable", /* AIX data or Coherent */
"\x10" "OPUS",
"\x18" "AST SmartSleep",
"\x24" "NEC DOS",
"\x39" "Plan 9",
"\x40" "Venix 80286",
"\x4d" "QNX4.x",
"\x4e" "QNX4.x 2nd part",
"\x4f" "QNX4.x 3rd part",
"\x50" "OnTrack DM",
"\x51" "OnTrack DM6 Aux1", /* (or Novell) */
"\x52" "CP/M", /* CP/M or Microport SysV/AT */
"\x53" "OnTrack DM6 Aux3",
"\x54" "OnTrackDM6",
"\x55" "EZ-Drive",
"\x56" "Golden Bow",
"\x5c" "Priam Edisk",
"\x61" "SpeedStor",
"\x64" "Novell Netware 286",
"\x65" "Novell Netware 386",
"\x70" "DiskSecure Multi-Boot",
"\x75" "PC/IX",
"\x93" "Amoeba",
"\x94" "Amoeba BBT", /* (bad block table) */
"\xa7" "NeXTSTEP",
"\xbb" "Boot Wizard hidden",
"\xc1" "DRDOS/sec (FAT-12)",
"\xc4" "DRDOS/sec (FAT-16 < 32M)",
"\xc6" "DRDOS/sec (FAT-16)",
"\xc7" "Syrinx",
"\xda" "Non-FS data",
"\xdb" "CP/M / CTOS / ...",/* CP/M or Concurrent CP/M or
Concurrent DOS or CTOS */
"\xde" "Dell Utility", /* Dell PowerEdge Server utilities */
"\xdf" "BootIt", /* BootIt EMBRM */
"\xe1" "DOS access", /* DOS access or SpeedStor 12-bit FAT
extended partition */
"\xe3" "DOS R/O", /* DOS R/O or SpeedStor */
"\xe4" "SpeedStor", /* SpeedStor 16-bit FAT extended
partition < 1024 cyl. */
"\xf1" "SpeedStor",
"\xf4" "SpeedStor", /* SpeedStor large partition */
"\xfe" "LANstep", /* SpeedStor >1024 cyl. or LANstep */
"\xff" "BBT", /* Xenix Bad Block Table */
#endif
NULL
};
enum {
dev_fd = 3 /* the disk */
};
/* Globals */
struct globals {
char *line_ptr;
const char *disk_device;
int g_partitions; // = 4; /* maximum partition + 1 */
unsigned units_per_sector; // = 1;
unsigned sector_size; // = DEFAULT_SECTOR_SIZE;
unsigned user_set_sector_size;
unsigned sector_offset; // = 1;
unsigned g_heads, g_sectors, g_cylinders;
smallint /* enum label_type */ current_label_type;
smallint display_in_cyl_units; // = 1;
#if ENABLE_FEATURE_OSF_LABEL
smallint possibly_osf_label;
#endif
smallint listing; /* no aborts for fdisk -l */
smallint dos_compatible_flag; // = 1;
#if ENABLE_FEATURE_FDISK_WRITABLE
//int dos_changed;
smallint nowarn; /* no warnings for fdisk -l/-s */
#endif
int ext_index; /* the prime extended partition */
unsigned user_cylinders, user_heads, user_sectors;
unsigned pt_heads, pt_sectors;
unsigned kern_heads, kern_sectors;
sector_t extended_offset; /* offset of link pointers */
sector_t total_number_of_sectors;
jmp_buf listingbuf;
char line_buffer[80];
char partname_buffer[80];
/* Raw disk label. For DOS-type partition tables the MBR,
* with descriptions of the primary partitions. */
char MBRbuffer[MAX_SECTOR_SIZE];
/* Partition tables */
struct pte ptes[MAXIMUM_PARTS];
};
#define G (*ptr_to_globals)
#define line_ptr (G.line_ptr )
#define disk_device (G.disk_device )
#define g_partitions (G.g_partitions )
#define units_per_sector (G.units_per_sector )
#define sector_size (G.sector_size )
#define user_set_sector_size (G.user_set_sector_size)
#define sector_offset (G.sector_offset )
#define g_heads (G.g_heads )
#define g_sectors (G.g_sectors )
#define g_cylinders (G.g_cylinders )
#define current_label_type (G.current_label_type )
#define display_in_cyl_units (G.display_in_cyl_units)
#define possibly_osf_label (G.possibly_osf_label )
#define listing (G.listing )
#define dos_compatible_flag (G.dos_compatible_flag )
#define nowarn (G.nowarn )
#define ext_index (G.ext_index )
#define user_cylinders (G.user_cylinders )
#define user_heads (G.user_heads )
#define user_sectors (G.user_sectors )
#define pt_heads (G.pt_heads )
#define pt_sectors (G.pt_sectors )
#define kern_heads (G.kern_heads )
#define kern_sectors (G.kern_sectors )
#define extended_offset (G.extended_offset )
#define total_number_of_sectors (G.total_number_of_sectors)
#define listingbuf (G.listingbuf )
#define line_buffer (G.line_buffer )
#define partname_buffer (G.partname_buffer)
#define MBRbuffer (G.MBRbuffer )
#define ptes (G.ptes )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
sector_size = DEFAULT_SECTOR_SIZE; \
sector_offset = 1; \
g_partitions = 4; \
display_in_cyl_units = 1; \
units_per_sector = 1; \
dos_compatible_flag = 1; \
} while (0)
/* TODO: move to libbb? */
/* TODO: return unsigned long long, FEATURE_FDISK_BLKSIZE _can_ handle
* disks > 2^32 sectors
*/
static sector_t bb_BLKGETSIZE_sectors(int fd)
{
uint64_t v64;
unsigned long longsectors;
if (ioctl(fd, BLKGETSIZE64, &v64) == 0) {
/* Got bytes, convert to 512 byte sectors */
v64 >>= 9;
if (v64 != (sector_t)v64) {
ret_trunc:
/* Not only DOS, but all other partition tables
* we support can't record more than 32 bit
* sector counts or offsets
*/
bb_error_msg("device has more than 2^32 sectors, can't use all of them");
v64 = (uint32_t)-1L;
}
return v64;
}
/* Needs temp of type long */
if (ioctl(fd, BLKGETSIZE, &longsectors)) {
/* Perhaps this is a disk image */
off_t sz = lseek(fd, 0, SEEK_END);
longsectors = 0;
if (sz > 0)
longsectors = (uoff_t)sz / sector_size;
lseek(fd, 0, SEEK_SET);
}
if (sizeof(long) > sizeof(sector_t)
&& longsectors != (sector_t)longsectors
) {
goto ret_trunc;
}
return longsectors;
}
#define IS_EXTENDED(i) \
((i) == EXTENDED || (i) == WIN98_EXTENDED || (i) == LINUX_EXTENDED)
#define cround(n) (display_in_cyl_units ? ((n)/units_per_sector)+1 : (n))
#define scround(x) (((x)+units_per_sector-1)/units_per_sector)
#define pt_offset(b, n) \
((struct partition *)((b) + 0x1be + (n) * sizeof(struct partition)))
#define sector(s) ((s) & 0x3f)
#define cylinder(s, c) ((c) | (((s) & 0xc0) << 2))
#define hsc2sector(h,s,c) \
(sector(s) - 1 + sectors * ((h) + heads * cylinder(s,c)))
static void
close_dev_fd(void)
{
/* Not really closing, but making sure it is open, and to harmless place */
xmove_fd(xopen(bb_dev_null, O_RDONLY), dev_fd);
}
/*
* Return partition name - uses static storage
*/
static const char *
partname(const char *dev, int pno, int lth)
{
const char *p;
int w, wp;
int bufsiz;
char *bufp;
bufp = partname_buffer;
bufsiz = sizeof(partname_buffer);
w = strlen(dev);
p = "";
if (isdigit(dev[w-1]))
p = "p";
/* devfs kludge - note: fdisk partition names are not supposed
to equal kernel names, so there is no reason to do this */
if (strcmp(dev + w - 4, "disc") == 0) {
w -= 4;
p = "part";
}
wp = strlen(p);
if (lth) {
snprintf(bufp, bufsiz, "%*.*s%s%-2u",
lth-wp-2, w, dev, p, pno);
} else {
snprintf(bufp, bufsiz, "%.*s%s%-2u", w, dev, p, pno);
}
return bufp;
}
static ALWAYS_INLINE struct partition *
get_part_table(int i)
{
return ptes[i].part_table;
}
static const char *
str_units(int n)
{ /* n==1: use singular */
if (n == 1)
return display_in_cyl_units ? "cylinder" : "sector";
return display_in_cyl_units ? "cylinders" : "sectors";
}
static int
valid_part_table_flag(const char *mbuffer)
{
return (mbuffer[510] == 0x55 && (uint8_t)mbuffer[511] == 0xaa);
}
static void fdisk_fatal(const char *why)
{
if (listing) {
close_dev_fd();
longjmp(listingbuf, 1);
}
bb_error_msg_and_die(why, disk_device);
}
static void
seek_sector(sector_t secno)
{
#if ENABLE_FDISK_SUPPORT_LARGE_DISKS
off64_t off = (off64_t)secno * sector_size;
if (lseek64(dev_fd, off, SEEK_SET) == (off64_t) -1)
fdisk_fatal(unable_to_seek);
#else
uint64_t off = (uint64_t)secno * sector_size;
if (off > MAXINT(off_t)
|| lseek(dev_fd, (off_t)off, SEEK_SET) == (off_t) -1
) {
fdisk_fatal(unable_to_seek);
}
#endif
}
#if ENABLE_FEATURE_FDISK_WRITABLE
/* Read line; return 0 or first printable char */
static int
read_line(const char *prompt)
{
int sz;
sz = read_line_input(prompt, line_buffer, sizeof(line_buffer), NULL);
if (sz <= 0)
exit(EXIT_SUCCESS); /* Ctrl-D or Ctrl-C */
if (line_buffer[sz-1] == '\n')
line_buffer[--sz] = '\0';
line_ptr = line_buffer;
while (*line_ptr != '\0' && (unsigned char)*line_ptr <= ' ')
line_ptr++;
return *line_ptr;
}
static void
set_all_unchanged(void)
{
int i;
for (i = 0; i < MAXIMUM_PARTS; i++)
ptes[i].changed = 0;
}
static ALWAYS_INLINE void
set_changed(int i)
{
ptes[i].changed = 1;
}
static ALWAYS_INLINE void
write_part_table_flag(char *b)
{
b[510] = 0x55;
b[511] = 0xaa;
}
static char
read_nonempty(const char *mesg)
{
while (!read_line(mesg))
continue;
return *line_ptr;
}
static char
read_maybe_empty(const char *mesg)
{
if (!read_line(mesg)) {
line_ptr = line_buffer;
line_ptr[0] = '\n';
line_ptr[1] = '\0';
}
return line_ptr[0];
}
static int
read_hex(const char *const *sys)
{
unsigned long v;
while (1) {
read_nonempty("Hex code (type L to list codes): ");
if ((line_ptr[0] | 0x20) == 'l') {
list_types(sys);
continue;
}
v = bb_strtoul(line_ptr, NULL, 16);
if (v <= 0xff)
return v;
}
}
static void
write_sector(sector_t secno, const void *buf)
{
seek_sector(secno);
xwrite(dev_fd, buf, sector_size);
}
#endif /* FEATURE_FDISK_WRITABLE */
#include "fdisk_aix.c"
struct sun_partition {
unsigned char info[128]; /* Informative text string */
unsigned char spare0[14];
struct sun_info {
unsigned char spare1;
unsigned char id;
unsigned char spare2;
unsigned char flags;
} infos[8];
unsigned char spare1[246]; /* Boot information etc. */
unsigned short rspeed; /* Disk rotational speed */
unsigned short pcylcount; /* Physical cylinder count */
unsigned short sparecyl; /* extra sects per cylinder */
unsigned char spare2[4]; /* More magic... */
unsigned short ilfact; /* Interleave factor */
unsigned short ncyl; /* Data cylinder count */
unsigned short nacyl; /* Alt. cylinder count */
unsigned short ntrks; /* Tracks per cylinder */
unsigned short nsect; /* Sectors per track */
unsigned char spare3[4]; /* Even more magic... */
struct sun_partinfo {
uint32_t start_cylinder;
uint32_t num_sectors;
} partitions[8];
unsigned short magic; /* Magic number */
unsigned short csum; /* Label xor'd checksum */
} FIX_ALIASING;
typedef struct sun_partition sun_partition;
#define sunlabel ((sun_partition *)MBRbuffer)
STATIC_OSF void bsd_select(void);
STATIC_OSF void xbsd_print_disklabel(int);
#include "fdisk_osf.c"
#if ENABLE_FEATURE_SGI_LABEL || ENABLE_FEATURE_SUN_LABEL
static uint16_t
fdisk_swap16(uint16_t x)
{
return (x << 8) | (x >> 8);
}
static uint32_t
fdisk_swap32(uint32_t x)
{
return (x << 24) |
((x & 0xFF00) << 8) |
((x & 0xFF0000) >> 8) |
(x >> 24);
}
#endif
STATIC_SGI const char *const sgi_sys_types[];
STATIC_SGI unsigned sgi_get_num_sectors(int i);
STATIC_SGI int sgi_get_sysid(int i);
STATIC_SGI void sgi_delete_partition(int i);
STATIC_SGI void sgi_change_sysid(int i, int sys);
STATIC_SGI void sgi_list_table(int xtra);
#if ENABLE_FEATURE_FDISK_ADVANCED
STATIC_SGI void sgi_set_xcyl(void);
#endif
STATIC_SGI int verify_sgi(int verbose);
STATIC_SGI void sgi_add_partition(int n, int sys);
STATIC_SGI void sgi_set_swappartition(int i);
STATIC_SGI const char *sgi_get_bootfile(void);
STATIC_SGI void sgi_set_bootfile(const char* aFile);
STATIC_SGI void create_sgiinfo(void);
STATIC_SGI void sgi_write_table(void);
STATIC_SGI void sgi_set_bootpartition(int i);
#include "fdisk_sgi.c"
STATIC_SUN const char *const sun_sys_types[];
STATIC_SUN void sun_delete_partition(int i);
STATIC_SUN void sun_change_sysid(int i, int sys);
STATIC_SUN void sun_list_table(int xtra);
STATIC_SUN void add_sun_partition(int n, int sys);
#if ENABLE_FEATURE_FDISK_ADVANCED
STATIC_SUN void sun_set_alt_cyl(void);
STATIC_SUN void sun_set_ncyl(int cyl);
STATIC_SUN void sun_set_xcyl(void);
STATIC_SUN void sun_set_ilfact(void);
STATIC_SUN void sun_set_rspeed(void);
STATIC_SUN void sun_set_pcylcount(void);
#endif
STATIC_SUN void toggle_sunflags(int i, unsigned char mask);
STATIC_SUN void verify_sun(void);
STATIC_SUN void sun_write_table(void);
#include "fdisk_sun.c"
static inline_if_little_endian unsigned
read4_little_endian(const unsigned char *cp)
{
uint32_t v;
move_from_unaligned32(v, cp);
return SWAP_LE32(v);
}
static sector_t
get_start_sect(const struct partition *p)
{
return read4_little_endian(p->start4);
}
static sector_t
get_nr_sects(const struct partition *p)
{
return read4_little_endian(p->size4);
}
#if ENABLE_FEATURE_FDISK_WRITABLE
/* start_sect and nr_sects are stored little endian on all machines */
/* moreover, they are not aligned correctly */
static inline_if_little_endian void
store4_little_endian(unsigned char *cp, unsigned val)
{
uint32_t v = SWAP_LE32(val);
move_to_unaligned32(cp, v);
}
static void
set_start_sect(struct partition *p, unsigned start_sect)
{
store4_little_endian(p->start4, start_sect);
}
static void
set_nr_sects(struct partition *p, unsigned nr_sects)
{
store4_little_endian(p->size4, nr_sects);
}
#endif
/* Allocate a buffer and read a partition table sector */
static void
read_pte(struct pte *pe, sector_t offset)
{
pe->offset_from_dev_start = offset;
pe->sectorbuffer = xzalloc(sector_size);
seek_sector(offset);
/* xread would make us abort - bad for fdisk -l */
if (full_read(dev_fd, pe->sectorbuffer, sector_size) != sector_size)
fdisk_fatal(unable_to_read);
#if ENABLE_FEATURE_FDISK_WRITABLE
pe->changed = 0;
#endif
pe->part_table = pe->ext_pointer = NULL;
}
static sector_t
get_partition_start_from_dev_start(const struct pte *pe)
{
return pe->offset_from_dev_start + get_start_sect(pe->part_table);
}
#if ENABLE_FEATURE_FDISK_WRITABLE
/*
* Avoid warning about DOS partitions when no DOS partition was changed.
* Here a heuristic "is probably dos partition".
* We might also do the opposite and warn in all cases except
* for "is probably nondos partition".
*/
#ifdef UNUSED
static int
is_dos_partition(int t)
{
return (t == 1 || t == 4 || t == 6 ||
t == 0x0b || t == 0x0c || t == 0x0e ||
t == 0x11 || t == 0x12 || t == 0x14 || t == 0x16 ||
t == 0x1b || t == 0x1c || t == 0x1e || t == 0x24 ||
t == 0xc1 || t == 0xc4 || t == 0xc6);
}
#endif
static void
menu(void)
{
puts("Command Action");
if (LABEL_IS_SUN) {
puts("a\ttoggle a read only flag"); /* sun */
puts("b\tedit bsd disklabel");
puts("c\ttoggle the mountable flag"); /* sun */
puts("d\tdelete a partition");
puts("l\tlist known partition types");
puts("n\tadd a new partition");
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 */
puts("t\tchange a partition's system id");
puts("u\tchange display/entry units");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
#if ENABLE_FEATURE_FDISK_ADVANCED
puts("x\textra functionality (experts only)");
#endif
} else if (LABEL_IS_SGI) {
puts("a\tselect bootable partition"); /* sgi flavour */
puts("b\tedit bootfile entry"); /* sgi */
puts("c\tselect sgi swap partition"); /* sgi flavour */
puts("d\tdelete a partition");
puts("l\tlist known partition types");
puts("n\tadd a new partition");
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 */
puts("t\tchange a partition's system id");
puts("u\tchange display/entry units");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
} else if (LABEL_IS_AIX) {
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 {
puts("a\ttoggle a bootable flag");
puts("b\tedit bsd disklabel");
puts("c\ttoggle the dos compatibility flag");
puts("d\tdelete a partition");
puts("l\tlist known partition types");
puts("n\tadd a new partition");
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 */
puts("t\tchange a partition's system id");
puts("u\tchange display/entry units");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
#if ENABLE_FEATURE_FDISK_ADVANCED
puts("x\textra functionality (experts only)");
#endif
}
}
#endif /* FEATURE_FDISK_WRITABLE */
#if ENABLE_FEATURE_FDISK_ADVANCED
static void
xmenu(void)
{
puts("Command Action");
if (LABEL_IS_SUN) {
puts("a\tchange number of alternate cylinders"); /*sun*/
puts("c\tchange number of cylinders");
puts("d\tprint the raw data in the partition table");
puts("e\tchange number of extra sectors per cylinder");/*sun*/
puts("h\tchange number of heads");
puts("i\tchange interleave factor"); /*sun*/
puts("o\tchange rotation speed (rpm)"); /*sun*/
puts("p\tprint the partition table");
puts("q\tquit without saving changes");
puts("r\treturn to main menu");
puts("s\tchange number of sectors/track");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
puts("y\tchange number of physical cylinders"); /*sun*/
} else if (LABEL_IS_SGI) {
puts("b\tmove beginning of data in a partition"); /* !sun */
puts("c\tchange number of cylinders");
puts("d\tprint the raw data in the partition table");
puts("e\tlist extended partitions"); /* !sun */
puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
puts("h\tchange number of heads");
puts("p\tprint the partition table");
puts("q\tquit without saving changes");
puts("r\treturn to main menu");
puts("s\tchange number of sectors/track");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
} else if (LABEL_IS_AIX) {
puts("b\tmove beginning of data in a partition"); /* !sun */
puts("c\tchange number of cylinders");
puts("d\tprint the raw data in the partition table");
puts("e\tlist extended partitions"); /* !sun */
puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
puts("h\tchange number of heads");
puts("p\tprint the partition table");
puts("q\tquit without saving changes");
puts("r\treturn to main menu");
puts("s\tchange number of sectors/track");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
} else {
puts("b\tmove beginning of data in a partition"); /* !sun */
puts("c\tchange number of cylinders");
puts("d\tprint the raw data in the partition table");
puts("e\tlist extended partitions"); /* !sun */
puts("f\tfix partition order"); /* !sun, !aix, !sgi */
#if ENABLE_FEATURE_SGI_LABEL
puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
#endif
puts("h\tchange number of heads");
puts("p\tprint the partition table");
puts("q\tquit without saving changes");
puts("r\treturn to main menu");
puts("s\tchange number of sectors/track");
puts("v\tverify the partition table");
puts("w\twrite table to disk and exit");
}
}
#endif /* ADVANCED mode */
#if ENABLE_FEATURE_FDISK_WRITABLE
static const char *const *
get_sys_types(void)
{
return (
LABEL_IS_SUN ? sun_sys_types :
LABEL_IS_SGI ? sgi_sys_types :
i386_sys_types);
}
#else
#define get_sys_types() i386_sys_types
#endif
static const char *
partition_type(unsigned char type)
{
int i;
const char *const *types = get_sys_types();
for (i = 0; types[i]; i++)
if ((unsigned char)types[i][0] == type)
return types[i] + 1;
return "Unknown";
}
static int
is_cleared_partition(const struct partition *p)
{
/* We consider partition "cleared" only if it has only zeros */
const char *cp = (const char *)p;
int cnt = sizeof(*p);
char bits = 0;
while (--cnt >= 0)
bits |= *cp++;
return (bits == 0);
}
static void
clear_partition(struct partition *p)
{
if (p)
memset(p, 0, sizeof(*p));
}
#if ENABLE_FEATURE_FDISK_WRITABLE
static int
get_sysid(int i)
{
return LABEL_IS_SUN ? sunlabel->infos[i].id :
(LABEL_IS_SGI ? sgi_get_sysid(i) :
ptes[i].part_table->sys_ind);
}
static void
list_types(const char *const *sys)
{
enum { COLS = 3 };
unsigned last[COLS];
unsigned done, next, size;
int i;
for (size = 0; sys[size]; size++)
continue;
done = 0;
for (i = COLS-1; i >= 0; i--) {
done += (size + i - done) / (i + 1);
last[COLS-1 - i] = done;
}
i = done = next = 0;
do {
printf("%c%2x %-22.22s", i ? ' ' : '\n',
(unsigned char)sys[next][0],
sys[next] + 1);
next = last[i++] + done;
if (i >= COLS || next >= last[i]) {
i = 0;
next = ++done;
}
} while (done < last[0]);
bb_putchar('\n');
}
#define set_hsc(h, s, c, sector) do \
{ \
s = sector % g_sectors + 1; \
sector /= g_sectors; \
h = sector % g_heads; \
sector /= g_heads; \
c = sector & 0xff; \
s |= (sector >> 2) & 0xc0; \
} while (0)
static void set_hsc_start_end(struct partition *p, sector_t start, sector_t stop)
{
if (dos_compatible_flag && (start / (g_sectors * g_heads) > 1023))
start = g_heads * g_sectors * 1024 - 1;
set_hsc(p->head, p->sector, p->cyl, start);
if (dos_compatible_flag && (stop / (g_sectors * g_heads) > 1023))
stop = g_heads * g_sectors * 1024 - 1;
set_hsc(p->end_head, p->end_sector, p->end_cyl, stop);
}
static void
set_partition(int i, int doext, sector_t start, sector_t stop, int sysid)
{
struct partition *p;
sector_t offset;
if (doext) {
p = ptes[i].ext_pointer;
offset = extended_offset;
} else {
p = ptes[i].part_table;
offset = ptes[i].offset_from_dev_start;
}
p->boot_ind = 0;
p->sys_ind = sysid;
set_start_sect(p, start - offset);
set_nr_sects(p, stop - start + 1);
set_hsc_start_end(p, start, stop);
ptes[i].changed = 1;
}
#endif
static int
warn_geometry(void)
{
if (g_heads && g_sectors && g_cylinders)
return 0;
printf("Unknown value(s) for:");
if (!g_heads)
printf(" heads");
if (!g_sectors)
printf(" sectors");
if (!g_cylinders)
printf(" cylinders");
printf(
#if ENABLE_FEATURE_FDISK_WRITABLE
" (settable in the extra functions menu)"
#endif
"\n");
return 1;
}
static void
update_units(void)
{
int cyl_units = g_heads * g_sectors;
if (display_in_cyl_units && cyl_units)
units_per_sector = cyl_units;
else
units_per_sector = 1; /* in sectors */
}
#if ENABLE_FEATURE_FDISK_WRITABLE
static void
warn_cylinders(void)
{
if (LABEL_IS_DOS && g_cylinders > 1024 && !nowarn)
printf("\n"
"The number of cylinders for this disk is set to %u.\n"
"There is nothing wrong with that, but this is larger than 1024,\n"
"and could in certain setups cause problems with:\n"
"1) software that runs at boot time (e.g., old versions of LILO)\n"
"2) booting and partitioning software from other OSs\n"
" (e.g., DOS FDISK, OS/2 FDISK)\n",
g_cylinders);
}
#endif
static void
read_extended(int ext)
{
int i;
struct pte *pex;
struct partition *p, *q;
ext_index = ext;
pex = &ptes[ext];
pex->ext_pointer = pex->part_table;
p = pex->part_table;
if (!get_start_sect(p)) {
printf("Bad offset in primary extended partition\n");
return;
}
while (IS_EXTENDED(p->sys_ind)) {
struct pte *pe = &ptes[g_partitions];
if (g_partitions >= MAXIMUM_PARTS) {
/* This is not a Linux restriction, but
this program uses arrays of size MAXIMUM_PARTS.
Do not try to 'improve' this test. */
struct pte *pre = &ptes[g_partitions - 1];
#if ENABLE_FEATURE_FDISK_WRITABLE
printf("Warning: deleting partitions after %u\n",
g_partitions);
pre->changed = 1;
#endif
clear_partition(pre->ext_pointer);
return;
}
read_pte(pe, extended_offset + get_start_sect(p));
if (!extended_offset)
extended_offset = get_start_sect(p);
q = p = pt_offset(pe->sectorbuffer, 0);
for (i = 0; i < 4; i++, p++) if (get_nr_sects(p)) {
if (IS_EXTENDED(p->sys_ind)) {
if (pe->ext_pointer)
printf("Warning: extra link "
"pointer in partition table"
" %u\n", g_partitions + 1);
else
pe->ext_pointer = p;
} else if (p->sys_ind) {
if (pe->part_table)
printf("Warning: ignoring extra "
"data in partition table"
" %u\n", g_partitions + 1);
else
pe->part_table = p;
}
}
/* very strange code here... */
if (!pe->part_table) {
if (q != pe->ext_pointer)
pe->part_table = q;
else
pe->part_table = q + 1;
}
if (!pe->ext_pointer) {
if (q != pe->part_table)
pe->ext_pointer = q;
else
pe->ext_pointer = q + 1;
}
p = pe->ext_pointer;
g_partitions++;
}
#if ENABLE_FEATURE_FDISK_WRITABLE
/* remove empty links */
remove:
for (i = 4; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
if (!get_nr_sects(pe->part_table)
&& (g_partitions > 5 || ptes[4].part_table->sys_ind)
) {
printf("Omitting empty partition (%u)\n", i+1);
delete_partition(i);
goto remove; /* numbering changed */
}
}
#endif
}
#if ENABLE_FEATURE_FDISK_WRITABLE
static void
create_doslabel(void)
{
printf(msg_building_new_label, "DOS disklabel");
current_label_type = LABEL_DOS;
#if ENABLE_FEATURE_OSF_LABEL
possibly_osf_label = 0;
#endif
g_partitions = 4;
memset(&MBRbuffer[510 - 4*16], 0, 4*16);
write_part_table_flag(MBRbuffer);
extended_offset = 0;
set_all_unchanged();
set_changed(0);
get_boot(CREATE_EMPTY_DOS);
}
#endif
static void
get_sectorsize(void)
{
if (!user_set_sector_size) {
int arg;
if (ioctl(dev_fd, BLKSSZGET, &arg) == 0)
sector_size = arg;
if (sector_size != DEFAULT_SECTOR_SIZE)
printf("Note: sector size is %u "
"(not " DEFAULT_SECTOR_SIZE_STR ")\n",
sector_size);
}
}
static void
get_kernel_geometry(void)
{
struct hd_geometry geometry;
if (!ioctl(dev_fd, HDIO_GETGEO, &geometry)) {
kern_heads = geometry.heads;
kern_sectors = geometry.sectors;
/* never use geometry.cylinders - it is truncated */
}
}
static void
get_partition_table_geometry(void)
{
const unsigned char *bufp = (const unsigned char *)MBRbuffer;
struct partition *p;
int i, h, s, hh, ss;
int first = 1;
int bad = 0;
if (!(valid_part_table_flag((char*)bufp)))
return;
hh = ss = 0;
for (i = 0; i < 4; i++) {
p = pt_offset(bufp, i);
if (p->sys_ind != 0) {
h = p->end_head + 1;
s = (p->end_sector & 077);
if (first) {
hh = h;
ss = s;
first = 0;
} else if (hh != h || ss != s)
bad = 1;
}
}
if (!first && !bad) {
pt_heads = hh;
pt_sectors = ss;
}
}
static void
get_geometry(void)
{
int sec_fac;
get_sectorsize();
sec_fac = sector_size / 512;
#if ENABLE_FEATURE_SUN_LABEL
guess_device_type();
#endif
g_heads = g_cylinders = g_sectors = 0;
kern_heads = kern_sectors = 0;
pt_heads = pt_sectors = 0;
get_kernel_geometry();
get_partition_table_geometry();
g_heads = user_heads ? user_heads :
pt_heads ? pt_heads :
kern_heads ? kern_heads : 255;
g_sectors = user_sectors ? user_sectors :
pt_sectors ? pt_sectors :
kern_sectors ? kern_sectors : 63;
total_number_of_sectors = bb_BLKGETSIZE_sectors(dev_fd);
sector_offset = 1;
if (dos_compatible_flag)
sector_offset = g_sectors;
g_cylinders = total_number_of_sectors / (g_heads * g_sectors * sec_fac);
if (!g_cylinders)
g_cylinders = user_cylinders;
}
/*
* Opens disk_device and optionally reads MBR.
* FIXME: document what each 'what' value will do!
* Returns:
* -1: no 0xaa55 flag present (possibly entire disk BSD)
* 0: found or created label
* 1: I/O error
*/
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what)
#else
static int get_boot(void)
#define get_boot(what) get_boot()
#endif
{
int i, fd;
g_partitions = 4;
for (i = 0; i < 4; i++) {
struct pte *pe = &ptes[i];
pe->part_table = pt_offset(MBRbuffer, i);
pe->ext_pointer = NULL;
pe->offset_from_dev_start = 0;
pe->sectorbuffer = MBRbuffer;
#if ENABLE_FEATURE_FDISK_WRITABLE
pe->changed = (what == CREATE_EMPTY_DOS);
#endif
}
#if ENABLE_FEATURE_FDISK_WRITABLE
// ALERT! highly idiotic design!
// We end up here when we call get_boot() recursively
// via get_boot() [table is bad] -> create_doslabel() -> get_boot(CREATE_EMPTY_DOS).
// or get_boot() [table is bad] -> create_sunlabel() -> get_boot(CREATE_EMPTY_SUN).
// (just factor out re-init of ptes[0,1,2,3] in a separate fn instead?)
// So skip opening device _again_...
if (what == CREATE_EMPTY_DOS IF_FEATURE_SUN_LABEL(|| what == CREATE_EMPTY_SUN))
goto created_table;
fd = open(disk_device, (option_mask32 & OPT_l) ? O_RDONLY : O_RDWR);
if (fd < 0) {
fd = open(disk_device, O_RDONLY);
if (fd < 0) {
if (what == TRY_ONLY)
return 1;
fdisk_fatal(unable_to_open);
}
printf("'%s' is opened for read only\n", disk_device);
}
xmove_fd(fd, dev_fd);
if (512 != full_read(dev_fd, MBRbuffer, 512)) {
if (what == TRY_ONLY) {
close_dev_fd();
return 1;
}
fdisk_fatal(unable_to_read);
}
#else
fd = open(disk_device, O_RDONLY);
if (fd < 0)
return 1;
if (512 != full_read(fd, MBRbuffer, 512)) {
close(fd);
return 1;
}
xmove_fd(fd, dev_fd);
#endif
get_geometry();
update_units();
#if ENABLE_FEATURE_SUN_LABEL
if (check_sun_label())
return 0;
#endif
#if ENABLE_FEATURE_SGI_LABEL
if (check_sgi_label())
return 0;
#endif
#if ENABLE_FEATURE_AIX_LABEL
if (check_aix_label())
return 0;
#endif
#if ENABLE_FEATURE_OSF_LABEL
if (check_osf_label()) {
possibly_osf_label = 1;
if (!valid_part_table_flag(MBRbuffer)) {
current_label_type = LABEL_OSF;
return 0;
}
printf("This disk has both DOS and BSD magic.\n"
"Give the 'b' command to go to BSD mode.\n");
}
#endif
#if !ENABLE_FEATURE_FDISK_WRITABLE
if (!valid_part_table_flag(MBRbuffer))
return -1;
#else
if (!valid_part_table_flag(MBRbuffer)) {
if (what == OPEN_MAIN) {
printf("Device contains neither a valid DOS "
"partition table, nor Sun, SGI or OSF "
"disklabel\n");
#ifdef __sparc__
IF_FEATURE_SUN_LABEL(create_sunlabel();)
#else
create_doslabel();
#endif
return 0;
}
/* TRY_ONLY: */
return -1;
}
created_table:
#endif /* FEATURE_FDISK_WRITABLE */
IF_FEATURE_FDISK_WRITABLE(warn_cylinders();)
warn_geometry();
for (i = 0; i < 4; i++) {
if (IS_EXTENDED(ptes[i].part_table->sys_ind)) {
if (g_partitions != 4)
printf("Ignoring extra extended "
"partition %u\n", i + 1);
else
read_extended(i);
}
}
for (i = 3; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
if (!valid_part_table_flag(pe->sectorbuffer)) {
printf("Warning: invalid flag 0x%02x,0x%02x of partition "
"table %u will be corrected by w(rite)\n",
pe->sectorbuffer[510],
pe->sectorbuffer[511],
i + 1);
IF_FEATURE_FDISK_WRITABLE(pe->changed = 1;)
}
}
return 0;
}
#if ENABLE_FEATURE_FDISK_WRITABLE
/*
* Print the message MESG, then read an integer between LOW and HIGH (inclusive).
* If the user hits Enter, DFLT is returned.
* Answers like +10 are interpreted as offsets from BASE.
*
* There is no default if DFLT is not between LOW and HIGH.
*/
static sector_t
read_int(sector_t low, sector_t dflt, sector_t high, sector_t base, const char *mesg)
{
sector_t value;
int default_ok = 1;
const char *fmt = "%s (%u-%u, default %u): ";
if (dflt < low || dflt > high) {
fmt = "%s (%u-%u): ";
default_ok = 0;
}
while (1) {
int use_default = default_ok;
/* ask question and read answer */
do {
printf(fmt, mesg, low, high, dflt);
read_maybe_empty("");
} while (*line_ptr != '\n' && !isdigit(*line_ptr)
&& *line_ptr != '-' && *line_ptr != '+');
if (*line_ptr == '+' || *line_ptr == '-') {
int minus = (*line_ptr == '-');
int absolute = 0;
value = atoi(line_ptr + 1);
/* (1) if 2nd char is digit, use_default = 0.
* (2) move line_ptr to first non-digit. */
while (isdigit(*++line_ptr))
use_default = 0;
switch (*line_ptr) {
case 'c':
case 'C':
if (!display_in_cyl_units)
value *= g_heads * g_sectors;
break;
case 'K':
absolute = 1024;
break;
case 'k':
absolute = 1000;
break;
case 'm':
case 'M':
absolute = 1000000;
break;
case 'g':
case 'G':
absolute = 1000000000;
break;
default:
break;
}
if (absolute) {
ullong bytes;
unsigned long unit;
bytes = (ullong) value * absolute;
unit = sector_size * units_per_sector;
bytes += unit/2; /* round */
bytes /= unit;
value = bytes;
}
if (minus)
value = -value;
value += base;
} else {
value = atoi(line_ptr);
while (isdigit(*line_ptr)) {
line_ptr++;
use_default = 0;
}
}
if (use_default) {
value = dflt;
printf("Using default value %u\n", value);
}
if (value >= low && value <= high)
break;
printf("Value is out of range\n");
}
return value;
}
static unsigned
get_partition(int warn, unsigned max)
{
struct pte *pe;
unsigned i;
i = read_int(1, 0, max, 0, "Partition number") - 1;
pe = &ptes[i];
if (warn) {
if ((!LABEL_IS_SUN && !LABEL_IS_SGI && !pe->part_table->sys_ind)
|| (LABEL_IS_SUN && (!sunlabel->partitions[i].num_sectors || !sunlabel->infos[i].id))
|| (LABEL_IS_SGI && !sgi_get_num_sectors(i))
) {
printf("Warning: partition %u has empty type\n", i+1);
}
}
return i;
}
static int
get_existing_partition(int warn, unsigned max)
{
int pno = -1;
unsigned i;
for (i = 0; i < max; i++) {
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
if (p && !is_cleared_partition(p)) {
if (pno >= 0)
goto not_unique;
pno = i;
}
}
if (pno >= 0) {
printf("Selected partition %u\n", pno+1);
return pno;
}
printf("No partition is defined yet!\n");
return -1;
not_unique:
return get_partition(warn, max);
}
static int
get_nonexisting_partition(int warn, unsigned max)
{
int pno = -1;
unsigned i;
for (i = 0; i < max; i++) {
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
if (p && is_cleared_partition(p)) {
if (pno >= 0)
goto not_unique;
pno = i;
}
}
if (pno >= 0) {
printf("Selected partition %u\n", pno+1);
return pno;
}
printf("All primary partitions have been defined already!\n");
return -1;
not_unique:
return get_partition(warn, max);
}
static void
change_units(void)
{
display_in_cyl_units = !display_in_cyl_units;
update_units();
printf("Changing display/entry units to %s\n",
str_units(PLURAL));
}
static void
toggle_active(int i)
{
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
if (IS_EXTENDED(p->sys_ind) && !p->boot_ind)
printf("WARNING: Partition %u is an extended partition\n", i + 1);
p->boot_ind = (p->boot_ind ? 0 : ACTIVE_FLAG);
pe->changed = 1;
}
static void
toggle_dos_compatibility_flag(void)
{
dos_compatible_flag = 1 - dos_compatible_flag;
if (dos_compatible_flag) {
sector_offset = g_sectors;
printf("DOS Compatibility flag is set\n");
} else {
sector_offset = 1;
printf("DOS Compatibility flag is not set\n");
}
}
static void
delete_partition(int i)
{
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
struct partition *q = pe->ext_pointer;
/* Note that for the fifth partition (i == 4) we don't actually
* decrement partitions.
*/
if (warn_geometry())
return; /* C/H/S not set */
pe->changed = 1;
if (LABEL_IS_SUN) {
sun_delete_partition(i);
return;
}
if (LABEL_IS_SGI) {
sgi_delete_partition(i);
return;
}
if (i < 4) {
if (IS_EXTENDED(p->sys_ind) && i == ext_index) {
g_partitions = 4;
ptes[ext_index].ext_pointer = NULL;
extended_offset = 0;
}
clear_partition(p);
return;
}
if (!q->sys_ind && i > 4) {
/* the last one in the chain - just delete */
--g_partitions;
--i;
clear_partition(ptes[i].ext_pointer);
ptes[i].changed = 1;
} else {
/* not the last one - further ones will be moved down */
if (i > 4) {
/* delete this link in the chain */
p = ptes[i-1].ext_pointer;
*p = *q;
set_start_sect(p, get_start_sect(q));
set_nr_sects(p, get_nr_sects(q));
ptes[i-1].changed = 1;
} else if (g_partitions > 5) { /* 5 will be moved to 4 */
/* the first logical in a longer chain */
pe = &ptes[5];
if (pe->part_table) /* prevent SEGFAULT */
set_start_sect(pe->part_table,
get_partition_start_from_dev_start(pe) -
extended_offset);
pe->offset_from_dev_start = extended_offset;
pe->changed = 1;
}
if (g_partitions > 5) {
g_partitions--;
while (i < g_partitions) {
ptes[i] = ptes[i+1];
i++;
}
} else {
/* the only logical: clear only */
clear_partition(ptes[i].part_table);
}
}
}
static void
change_sysid(void)
{
int i, sys, origsys;
struct partition *p;
/* If sgi_label then don't use get_existing_partition,
let the user select a partition, since get_existing_partition()
only works for Linux like partition tables. */
if (!LABEL_IS_SGI) {
i = get_existing_partition(0, g_partitions);
} else {
i = get_partition(0, g_partitions);
}
if (i == -1)
return;
p = ptes[i].part_table;
origsys = sys = get_sysid(i);
/* if changing types T to 0 is allowed, then
the reverse change must be allowed, too */
if (!sys && !LABEL_IS_SGI && !LABEL_IS_SUN && !get_nr_sects(p)) {
printf("Partition %u does not exist yet!\n", i + 1);
return;
}
while (1) {
sys = read_hex(get_sys_types());
if (!sys && !LABEL_IS_SGI && !LABEL_IS_SUN) {
printf("Type 0 means free space to many systems\n"
"(but not to Linux). Having partitions of\n"
"type 0 is probably unwise.\n");
/* break; */
}
if (!LABEL_IS_SUN && !LABEL_IS_SGI) {
if (IS_EXTENDED(sys) != IS_EXTENDED(p->sys_ind)) {
printf("You cannot change a partition into"
" an extended one or vice versa\n");
break;
}
}
if (sys < 256) {
#if ENABLE_FEATURE_SUN_LABEL
if (LABEL_IS_SUN && i == 2 && sys != SUN_WHOLE_DISK)
printf("Consider leaving partition 3 "
"as Whole disk (5),\n"
"as SunOS/Solaris expects it and "
"even Linux likes it\n\n");
#endif
#if ENABLE_FEATURE_SGI_LABEL
if (LABEL_IS_SGI &&
(
(i == 10 && sys != SGI_ENTIRE_DISK) ||
(i == 8 && sys != 0)
)
) {
printf("Consider leaving partition 9 "
"as volume header (0),\nand "
"partition 11 as entire volume (6)"
"as IRIX expects it\n\n");
}
#endif
if (sys == origsys)
break;
if (LABEL_IS_SUN) {
sun_change_sysid(i, sys);
} else if (LABEL_IS_SGI) {
sgi_change_sysid(i, sys);
} else
p->sys_ind = sys;
printf("Changed system type of partition %u "
"to %x (%s)\n", i + 1, sys,
partition_type(sys));
ptes[i].changed = 1;
//if (is_dos_partition(origsys) || is_dos_partition(sys))
// dos_changed = 1;
break;
}
}
}
#endif /* FEATURE_FDISK_WRITABLE */
/* check_consistency() and linear2chs() added Sat Mar 6 12:28:16 1993,
* faith@cs.unc.edu, based on code fragments from pfdisk by Gordon W. Ross,
* Jan. 1990 (version 1.2.1 by Gordon W. Ross Aug. 1990; Modified by S.
* Lubkin Oct. 1991). */
static void
linear2chs(unsigned ls, unsigned *c, unsigned *h, unsigned *s)
{
int spc = g_heads * g_sectors;
*c = ls / spc;
ls = ls % spc;
*h = ls / g_sectors;
*s = ls % g_sectors + 1; /* sectors count from 1 */
}
static void
check_consistency(const struct partition *p, int partition)
{
unsigned pbc, pbh, pbs; /* physical beginning c, h, s */
unsigned pec, peh, pes; /* physical ending c, h, s */
unsigned lbc, lbh, lbs; /* logical beginning c, h, s */
unsigned lec, leh, les; /* logical ending c, h, s */
if (!g_heads || !g_sectors || (partition >= 4))
return; /* do not check extended partitions */
/* physical beginning c, h, s */
pbc = (p->cyl & 0xff) | ((p->sector << 2) & 0x300);
pbh = p->head;
pbs = p->sector & 0x3f;
/* physical ending c, h, s */
pec = (p->end_cyl & 0xff) | ((p->end_sector << 2) & 0x300);
peh = p->end_head;
pes = p->end_sector & 0x3f;
/* compute logical beginning (c, h, s) */
linear2chs(get_start_sect(p), &lbc, &lbh, &lbs);
/* compute logical ending (c, h, s) */
linear2chs(get_start_sect(p) + get_nr_sects(p) - 1, &lec, &leh, &les);
/* Same physical / logical beginning? */
if (g_cylinders <= 1024 && (pbc != lbc || pbh != lbh || pbs != lbs)) {
printf("Partition %u has different physical/logical "
"beginnings (non-Linux?):\n", partition + 1);
printf(" phys=(%u, %u, %u) ", pbc, pbh, pbs);
printf("logical=(%u, %u, %u)\n", lbc, lbh, lbs);
}
/* Same physical / logical ending? */
if (g_cylinders <= 1024 && (pec != lec || peh != leh || pes != les)) {
printf("Partition %u has different physical/logical "
"endings:\n", partition + 1);
printf(" phys=(%u, %u, %u) ", pec, peh, pes);
printf("logical=(%u, %u, %u)\n", lec, leh, les);
}
/* Ending on cylinder boundary? */
if (peh != (g_heads - 1) || pes != g_sectors) {
printf("Partition %u does not end on cylinder boundary\n",
partition + 1);
}
}
static void
list_disk_geometry(void)
{
ullong bytes = ((ullong)total_number_of_sectors << 9);
long megabytes = bytes / 1000000;
if (megabytes < 10000)
printf("\nDisk %s: %lu MB, %llu bytes\n",
disk_device, megabytes, bytes);
else
printf("\nDisk %s: %lu.%lu GB, %llu bytes\n",
disk_device, megabytes/1000, (megabytes/100)%10, bytes);
printf("%u heads, %u sectors/track, %u cylinders",
g_heads, g_sectors, g_cylinders);
if (units_per_sector == 1)
printf(", total %"SECT_FMT"u sectors",
total_number_of_sectors / (sector_size/512));
printf("\nUnits = %s of %u * %u = %u bytes\n\n",
str_units(PLURAL),
units_per_sector, sector_size, units_per_sector * sector_size);
}
/*
* Check whether partition entries are ordered by their starting positions.
* Return 0 if OK. Return i if partition i should have been earlier.
* Two separate checks: primary and logical partitions.
*/
static int
wrong_p_order(int *prev)
{
const struct pte *pe;
const struct partition *p;
sector_t last_p_start_pos = 0, p_start_pos;
unsigned i, last_i = 0;
for (i = 0; i < g_partitions; i++) {
if (i == 4) {
last_i = 4;
last_p_start_pos = 0;
}
pe = &ptes[i];
p = pe->part_table;
if (p->sys_ind) {
p_start_pos = get_partition_start_from_dev_start(pe);
if (last_p_start_pos > p_start_pos) {
if (prev)
*prev = last_i;
return i;
}
last_p_start_pos = p_start_pos;
last_i = i;
}
}
return 0;
}
#if ENABLE_FEATURE_FDISK_ADVANCED
/*
* Fix the chain of logicals.
* extended_offset is unchanged, the set of sectors used is unchanged
* The chain is sorted so that sectors increase, and so that
* starting sectors increase.
*
* After this it may still be that cfdisk doesnt like the table.
* (This is because cfdisk considers expanded parts, from link to
* end of partition, and these may still overlap.)
* Now
* sfdisk /dev/hda > ohda; sfdisk /dev/hda < ohda
* may help.
*/
static void
fix_chain_of_logicals(void)
{
int j, oj, ojj, sj, sjj;
struct partition *pj,*pjj,tmp;
/* Stage 1: sort sectors but leave sector of part 4 */
/* (Its sector is the global extended_offset.) */
stage1:
for (j = 5; j < g_partitions - 1; j++) {
oj = ptes[j].offset_from_dev_start;
ojj = ptes[j+1].offset_from_dev_start;
if (oj > ojj) {
ptes[j].offset_from_dev_start = ojj;
ptes[j+1].offset_from_dev_start = oj;
pj = ptes[j].part_table;
set_start_sect(pj, get_start_sect(pj)+oj-ojj);
pjj = ptes[j+1].part_table;
set_start_sect(pjj, get_start_sect(pjj)+ojj-oj);
set_start_sect(ptes[j-1].ext_pointer,
ojj-extended_offset);
set_start_sect(ptes[j].ext_pointer,
oj-extended_offset);
goto stage1;
}
}
/* Stage 2: sort starting sectors */
stage2:
for (j = 4; j < g_partitions - 1; j++) {
pj = ptes[j].part_table;
pjj = ptes[j+1].part_table;
sj = get_start_sect(pj);
sjj = get_start_sect(pjj);
oj = ptes[j].offset_from_dev_start;
ojj = ptes[j+1].offset_from_dev_start;
if (oj+sj > ojj+sjj) {
tmp = *pj;
*pj = *pjj;
*pjj = tmp;
set_start_sect(pj, ojj+sjj-oj);
set_start_sect(pjj, oj+sj-ojj);
goto stage2;
}
}
/* Probably something was changed */
for (j = 4; j < g_partitions; j++)
ptes[j].changed = 1;
}
static void
fix_partition_table_order(void)
{
struct pte *pei, *pek;
int i,k;
if (!wrong_p_order(NULL)) {
printf("Ordering is already correct\n\n");
return;
}
while ((i = wrong_p_order(&k)) != 0 && i < 4) {
/* partition i should have come earlier, move it */
/* We have to move data in the MBR */
struct partition *pi, *pk, *pe, pbuf;
pei = &ptes[i];
pek = &ptes[k];
pe = pei->ext_pointer;
pei->ext_pointer = pek->ext_pointer;
pek->ext_pointer = pe;
pi = pei->part_table;
pk = pek->part_table;
memmove(&pbuf, pi, sizeof(struct partition));
memmove(pi, pk, sizeof(struct partition));
memmove(pk, &pbuf, sizeof(struct partition));
pei->changed = pek->changed = 1;
}
if (i)
fix_chain_of_logicals();
printf("Done.\n");
}
#endif
static void
list_table(int xtra)
{
const struct partition *p;
int i, w;
if (LABEL_IS_SUN) {
sun_list_table(xtra);
return;
}
if (LABEL_IS_SUN) {
sgi_list_table(xtra);
return;
}
list_disk_geometry();
if (LABEL_IS_OSF) {
xbsd_print_disklabel(xtra);
return;
}
/* Heuristic: we list partition 3 of /dev/foo as /dev/foo3,
but if the device name ends in a digit, say /dev/foo1,
then the partition is called /dev/foo1p3. */
w = strlen(disk_device);
if (w && isdigit(disk_device[w-1]))
w++;
if (w < 5)
w = 5;
// 1 12345678901 12345678901 12345678901 12
printf("%*s Boot Start End Blocks Id System\n",
w+1, "Device");
for (i = 0; i < g_partitions; i++) {
const struct pte *pe = &ptes[i];
sector_t psects;
sector_t pblocks;
unsigned podd;
p = pe->part_table;
if (!p || is_cleared_partition(p))
continue;
psects = get_nr_sects(p);
pblocks = psects;
podd = 0;
if (sector_size < 1024) {
pblocks /= (1024 / sector_size);
podd = psects % (1024 / sector_size);
}
if (sector_size > 1024)
pblocks *= (sector_size / 1024);
printf("%s %c %11"SECT_FMT"u %11"SECT_FMT"u %11"SECT_FMT"u%c %2x %s\n",
partname(disk_device, i+1, w+2),
!p->boot_ind ? ' ' : p->boot_ind == ACTIVE_FLAG /* boot flag */
? '*' : '?',
cround(get_partition_start_from_dev_start(pe)), /* start */
cround(get_partition_start_from_dev_start(pe) + psects /* end */
- (psects ? 1 : 0)),
pblocks, podd ? '+' : ' ', /* odd flag on end */
p->sys_ind, /* type id */
partition_type(p->sys_ind)); /* type name */
check_consistency(p, i);
}
/* Is partition table in disk order? It need not be, but... */
/* partition table entries are not checked for correct order
* if this is a sgi, sun or aix labeled disk... */
if (LABEL_IS_DOS && wrong_p_order(NULL)) {
/* FIXME */
printf("\nPartition table entries are not in disk order\n");
}
}
#if ENABLE_FEATURE_FDISK_ADVANCED
static void
x_list_table(int extend)
{
const struct pte *pe;
const struct partition *p;
int i;
printf("\nDisk %s: %u heads, %u sectors, %u cylinders\n\n",
disk_device, g_heads, g_sectors, g_cylinders);
printf("Nr AF Hd Sec Cyl Hd Sec Cyl Start Size ID\n");
for (i = 0; i < g_partitions; i++) {
pe = &ptes[i];
p = (extend ? pe->ext_pointer : pe->part_table);
if (p != NULL) {
printf("%2u %02x%4u%4u%5u%4u%4u%5u%11"SECT_FMT"u%11"SECT_FMT"u %02x\n",
i + 1, p->boot_ind, p->head,
sector(p->sector),
cylinder(p->sector, p->cyl), p->end_head,
sector(p->end_sector),
cylinder(p->end_sector, p->end_cyl),
get_start_sect(p), get_nr_sects(p),
p->sys_ind);
if (p->sys_ind)
check_consistency(p, i);
}
}
}
#endif
#if ENABLE_FEATURE_FDISK_WRITABLE
static void
fill_bounds(sector_t *first, sector_t *last)
{
unsigned i;
const struct pte *pe = &ptes[0];
const struct partition *p;
for (i = 0; i < g_partitions; pe++,i++) {
p = pe->part_table;
if (!p->sys_ind || IS_EXTENDED(p->sys_ind)) {
first[i] = 0xffffffff;
last[i] = 0;
} else {
first[i] = get_partition_start_from_dev_start(pe);
last[i] = first[i] + get_nr_sects(p) - 1;
}
}
}
static void
check(int n, unsigned h, unsigned s, unsigned c, sector_t start)
{
sector_t total, real_s, real_c;
real_s = sector(s) - 1;
real_c = cylinder(s, c);
total = (real_c * g_sectors + real_s) * g_heads + h;
if (!total)
printf("Partition %u contains sector 0\n", n);
if (h >= g_heads)
printf("Partition %u: head %u greater than maximum %u\n",
n, h + 1, g_heads);
if (real_s >= g_sectors)
printf("Partition %u: sector %u greater than "
"maximum %u\n", n, s, g_sectors);
if (real_c >= g_cylinders)
printf("Partition %u: cylinder %"SECT_FMT"u greater than "
"maximum %u\n", n, real_c + 1, g_cylinders);
if (g_cylinders <= 1024 && start != total)
printf("Partition %u: previous sectors %"SECT_FMT"u disagrees with "
"total %"SECT_FMT"u\n", n, start, total);
}
static void
verify(void)
{
int i, j;
sector_t total = 1;
sector_t first[g_partitions], last[g_partitions];
struct partition *p;
if (warn_geometry())
return;
if (LABEL_IS_SUN) {
verify_sun();
return;
}
if (LABEL_IS_SGI) {
verify_sgi(1);
return;
}
fill_bounds(first, last);
for (i = 0; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
p = pe->part_table;
if (p->sys_ind && !IS_EXTENDED(p->sys_ind)) {
check_consistency(p, i);
if (get_partition_start_from_dev_start(pe) < first[i])
printf("Warning: bad start-of-data in "
"partition %u\n", i + 1);
check(i + 1, p->end_head, p->end_sector, p->end_cyl,
last[i]);
total += last[i] + 1 - first[i];
for (j = 0; j < i; j++) {
if ((first[i] >= first[j] && first[i] <= last[j])
|| ((last[i] <= last[j] && last[i] >= first[j]))) {
printf("Warning: partition %u overlaps "
"partition %u\n", j + 1, i + 1);
total += first[i] >= first[j] ?
first[i] : first[j];
total -= last[i] <= last[j] ?
last[i] : last[j];
}
}
}
}
if (extended_offset) {
struct pte *pex = &ptes[ext_index];
sector_t e_last = get_start_sect(pex->part_table) +
get_nr_sects(pex->part_table) - 1;
for (i = 4; i < g_partitions; i++) {
total++;
p = ptes[i].part_table;
if (!p->sys_ind) {
if (i != 4 || i + 1 < g_partitions)
printf("Warning: partition %u "
"is empty\n", i + 1);
} else if (first[i] < extended_offset || last[i] > e_last) {
printf("Logical partition %u not entirely in "
"partition %u\n", i + 1, ext_index + 1);
}
}
}
if (total > g_heads * g_sectors * g_cylinders)
printf("Total allocated sectors %u greater than the maximum "
"%u\n", total, g_heads * g_sectors * g_cylinders);
else {
total = g_heads * g_sectors * g_cylinders - total;
if (total != 0)
printf("%"SECT_FMT"u unallocated sectors\n", total);
}
}
static void
add_partition(int n, int sys)
{
char mesg[256]; /* 48 does not suffice in Japanese */
int i, num_read = 0;
struct partition *p = ptes[n].part_table;
struct partition *q = ptes[ext_index].part_table;
sector_t limit, temp;
sector_t start, stop = 0;
sector_t first[g_partitions], last[g_partitions];
if (p && p->sys_ind) {
printf(msg_part_already_defined, n + 1);
return;
}
fill_bounds(first, last);
if (n < 4) {
start = sector_offset;
if (display_in_cyl_units || !total_number_of_sectors)
limit = (sector_t) g_heads * g_sectors * g_cylinders - 1;
else
limit = total_number_of_sectors - 1;
if (extended_offset) {
first[ext_index] = extended_offset;
last[ext_index] = get_start_sect(q) +
get_nr_sects(q) - 1;
}
} else {
start = extended_offset + sector_offset;
limit = get_start_sect(q) + get_nr_sects(q) - 1;
}
if (display_in_cyl_units)
for (i = 0; i < g_partitions; i++)
first[i] = (cround(first[i]) - 1) * units_per_sector;
snprintf(mesg, sizeof(mesg), "First %s", str_units(SINGULAR));
do {
temp = start;
for (i = 0; i < g_partitions; i++) {
int lastplusoff;
if (start == ptes[i].offset_from_dev_start)
start += sector_offset;
lastplusoff = last[i] + ((n < 4) ? 0 : sector_offset);
if (start >= first[i] && start <= lastplusoff)
start = lastplusoff + 1;
}
if (start > limit)
break;
if (start >= temp+units_per_sector && num_read) {
printf("Sector %"SECT_FMT"u is already allocated\n", temp);
temp = start;
num_read = 0;
}
if (!num_read && start == temp) {
sector_t saved_start;
saved_start = start;
start = read_int(cround(saved_start), cround(saved_start), cround(limit), 0, mesg);
if (display_in_cyl_units) {
start = (start - 1) * units_per_sector;
if (start < saved_start)
start = saved_start;
}
num_read = 1;
}
} while (start != temp || !num_read);
if (n > 4) { /* NOT for fifth partition */
struct pte *pe = &ptes[n];
pe->offset_from_dev_start = start - sector_offset;
if (pe->offset_from_dev_start == extended_offset) { /* must be corrected */
pe->offset_from_dev_start++;
if (sector_offset == 1)
start++;
}
}
for (i = 0; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
if (start < pe->offset_from_dev_start && limit >= pe->offset_from_dev_start)
limit = pe->offset_from_dev_start - 1;
if (start < first[i] && limit >= first[i])
limit = first[i] - 1;
}
if (start > limit) {
printf("No free sectors available\n");
if (n > 4)
g_partitions--;
return;
}
if (cround(start) == cround(limit)) {
stop = limit;
} else {
snprintf(mesg, sizeof(mesg),
"Last %s or +size or +sizeM or +sizeK",
str_units(SINGULAR));
stop = read_int(cround(start), cround(limit), cround(limit), cround(start), mesg);
if (display_in_cyl_units) {
stop = stop * units_per_sector - 1;
if (stop >limit)
stop = limit;
}
}
set_partition(n, 0, start, stop, sys);
if (n > 4)
set_partition(n - 1, 1, ptes[n].offset_from_dev_start, stop, EXTENDED);
if (IS_EXTENDED(sys)) {
struct pte *pe4 = &ptes[4];
struct pte *pen = &ptes[n];
ext_index = n;
pen->ext_pointer = p;
pe4->offset_from_dev_start = extended_offset = start;
pe4->sectorbuffer = xzalloc(sector_size);
pe4->part_table = pt_offset(pe4->sectorbuffer, 0);
pe4->ext_pointer = pe4->part_table + 1;
pe4->changed = 1;
g_partitions = 5;
}
}
static void
add_logical(void)
{
if (g_partitions > 5 || ptes[4].part_table->sys_ind) {
struct pte *pe = &ptes[g_partitions];
pe->sectorbuffer = xzalloc(sector_size);
pe->part_table = pt_offset(pe->sectorbuffer, 0);
pe->ext_pointer = pe->part_table + 1;
pe->offset_from_dev_start = 0;
pe->changed = 1;
g_partitions++;
}
add_partition(g_partitions - 1, LINUX_NATIVE);
}
static void
new_partition(void)
{
int i, free_primary = 0;
if (warn_geometry())
return;
if (LABEL_IS_SUN) {
add_sun_partition(get_partition(0, g_partitions), LINUX_NATIVE);
return;
}
if (LABEL_IS_SGI) {
sgi_add_partition(get_partition(0, g_partitions), LINUX_NATIVE);
return;
}
if (LABEL_IS_AIX) {
printf("Sorry - this fdisk cannot handle AIX disk labels.\n"
"If you want to add DOS-type partitions, create a new empty DOS partition\n"
"table first (use 'o'). This will destroy the present disk contents.\n");
return;
}
for (i = 0; i < 4; i++)
free_primary += !ptes[i].part_table->sys_ind;
if (!free_primary && g_partitions >= MAXIMUM_PARTS) {
printf("The maximum number of partitions has been created\n");
return;
}
if (!free_primary) {
if (extended_offset)
add_logical();
else
printf("You must delete some partition and add "
"an extended partition first\n");
} else {
char c, line[80];
snprintf(line, sizeof(line),
"Command action\n"
" %s\n"
" p primary partition (1-4)\n",
(extended_offset ?
"l logical (5 or over)" : "e extended"));
while (1) {
c = read_nonempty(line);
if ((c | 0x20) == 'p') {
i = get_nonexisting_partition(0, 4);
if (i >= 0)
add_partition(i, LINUX_NATIVE);
return;
}
if (c == 'l' && extended_offset) {
add_logical();
return;
}
if (c == 'e' && !extended_offset) {
i = get_nonexisting_partition(0, 4);
if (i >= 0)
add_partition(i, EXTENDED);
return;
}
printf("Invalid partition number "
"for type '%c'\n", c);
}
}
}
static void
write_table(void)
{
int i;
if (LABEL_IS_DOS) {
for (i = 0; i < 3; i++)
if (ptes[i].changed)
ptes[3].changed = 1;
for (i = 3; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
if (pe->changed) {
write_part_table_flag(pe->sectorbuffer);
write_sector(pe->offset_from_dev_start, pe->sectorbuffer);
}
}
}
else if (LABEL_IS_SGI) {
/* no test on change? the printf below might be mistaken */
sgi_write_table();
}
else if (LABEL_IS_SUN) {
int needw = 0;
for (i = 0; i < 8; i++)
if (ptes[i].changed)
needw = 1;
if (needw)
sun_write_table();
}
printf("The partition table has been altered!\n\n");
reread_partition_table(1);
}
static void
reread_partition_table(int leave)
{
int i;
printf("Calling ioctl() to re-read partition table\n");
sync();
/* sleep(2); Huh? */
i = ioctl_or_perror(dev_fd, BLKRRPART, NULL,
"WARNING: rereading partition table "
"failed, kernel still uses old table");
#if 0
if (dos_changed)
printf(
"\nWARNING: If you have created or modified any DOS 6.x\n"
"partitions, please see the fdisk manual page for additional\n"
"information\n");
#endif
if (leave) {
if (ENABLE_FEATURE_CLEAN_UP)
close_dev_fd();
exit(i != 0);
}
}
#endif /* FEATURE_FDISK_WRITABLE */
#if ENABLE_FEATURE_FDISK_ADVANCED
#define MAX_PER_LINE 16
static void
print_buffer(char *pbuffer)
{
int i,l;
for (i = 0, l = 0; i < sector_size; i++, l++) {
if (l == 0)
printf("0x%03X:", i);
printf(" %02X", (unsigned char) pbuffer[i]);
if (l == MAX_PER_LINE - 1) {
bb_putchar('\n');
l = -1;
}
}
if (l > 0)
bb_putchar('\n');
bb_putchar('\n');
}
static void
print_raw(void)
{
int i;
printf("Device: %s\n", disk_device);
if (LABEL_IS_SGI || LABEL_IS_SUN)
print_buffer(MBRbuffer);
else {
for (i = 3; i < g_partitions; i++)
print_buffer(ptes[i].sectorbuffer);
}
}
static void
move_begin(unsigned i)
{
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
sector_t new, first, nr_sects;
if (warn_geometry())
return;
nr_sects = get_nr_sects(p);
if (!p->sys_ind || !nr_sects || IS_EXTENDED(p->sys_ind)) {
printf("Partition %u has no data area\n", i + 1);
return;
}
first = get_partition_start_from_dev_start(pe); /* == pe->offset_from_dev_start + get_start_sect(p) */
new = read_int(0 /*was:first*/, first, first + nr_sects - 1, first, "New beginning of data");
if (new != first) {
sector_t new_relative = new - pe->offset_from_dev_start;
nr_sects += (get_start_sect(p) - new_relative);
set_start_sect(p, new_relative);
set_nr_sects(p, nr_sects);
read_nonempty("Recalculate C/H/S values? (Y/N): ");
if ((line_ptr[0] | 0x20) == 'y')
set_hsc_start_end(p, new, new + nr_sects - 1);
pe->changed = 1;
}
}
static void
xselect(void)
{
char c;
while (1) {
bb_putchar('\n');
c = 0x20 | read_nonempty("Expert command (m for help): ");
switch (c) {
case 'a':
if (LABEL_IS_SUN)
sun_set_alt_cyl();
break;
case 'b':
if (LABEL_IS_DOS)
move_begin(get_partition(0, g_partitions));
break;
case 'c':
user_cylinders = g_cylinders =
read_int(1, g_cylinders, 1048576, 0,
"Number of cylinders");
if (LABEL_IS_SUN)
sun_set_ncyl(g_cylinders);
if (LABEL_IS_DOS)
warn_cylinders();
break;
case 'd':
print_raw();
break;
case 'e':
if (LABEL_IS_SGI)
sgi_set_xcyl();
else if (LABEL_IS_SUN)
sun_set_xcyl();
else if (LABEL_IS_DOS)
x_list_table(1);
break;
case 'f':
if (LABEL_IS_DOS)
fix_partition_table_order();
break;
case 'g':
#if ENABLE_FEATURE_SGI_LABEL
create_sgilabel();
#endif
break;
case 'h':
user_heads = g_heads = read_int(1, g_heads, 256, 0, "Number of heads");
update_units();
break;
case 'i':
if (LABEL_IS_SUN)
sun_set_ilfact();
break;
case 'o':
if (LABEL_IS_SUN)
sun_set_rspeed();
break;
case 'p':
if (LABEL_IS_SUN)
list_table(1);
else
x_list_table(0);
break;
case 'q':
if (ENABLE_FEATURE_CLEAN_UP)
close_dev_fd();
bb_putchar('\n');
exit(EXIT_SUCCESS);
case 'r':
return;
case 's':
user_sectors = g_sectors = read_int(1, g_sectors, 63, 0, "Number of sectors");
if (dos_compatible_flag) {
sector_offset = g_sectors;
printf("Warning: setting sector offset for DOS "
"compatiblity\n");
}
update_units();
break;
case 'v':
verify();
break;
case 'w':
write_table(); /* does not return */
break;
case 'y':
if (LABEL_IS_SUN)
sun_set_pcylcount();
break;
default:
xmenu();
}
}
}
#endif /* ADVANCED mode */
static int
is_ide_cdrom_or_tape(const char *device)
{
FILE *procf;
char buf[100];
struct stat statbuf;
int is_ide = 0;
/* No device was given explicitly, and we are trying some
likely things. But opening /dev/hdc may produce errors like
"hdc: tray open or drive not ready"
if it happens to be a CD-ROM drive. It even happens that
the process hangs on the attempt to read a music CD.
So try to be careful. This only works since 2.1.73. */
if (strncmp("/dev/hd", device, 7))
return 0;
snprintf(buf, sizeof(buf), "/proc/ide/%s/media", device+5);
procf = fopen_for_read(buf);
if (procf != NULL && fgets(buf, sizeof(buf), procf))
is_ide = (!strncmp(buf, "cdrom", 5) ||
!strncmp(buf, "tape", 4));
else
/* Now when this proc file does not exist, skip the
device when it is read-only. */
if (stat(device, &statbuf) == 0)
is_ide = ((statbuf.st_mode & 0222) == 0);
if (procf)
fclose(procf);
return is_ide;
}
static void
open_list_and_close(const char *device, int user_specified)
{
int gb;
disk_device = device;
if (setjmp(listingbuf))
return;
if (!user_specified)
if (is_ide_cdrom_or_tape(device))
return;
/* Open disk_device, save file descriptor to dev_fd */
errno = 0;
gb = get_boot(TRY_ONLY);
if (gb > 0) { /* I/O error */
/* Ignore other errors, since we try IDE
and SCSI hard disks which may not be
installed on the system. */
if (user_specified || errno == EACCES)
bb_perror_msg("can't open '%s'", device);
return;
}
if (gb < 0) { /* no DOS signature */
list_disk_geometry();
if (LABEL_IS_AIX)
goto ret;
#if ENABLE_FEATURE_OSF_LABEL
if (bsd_trydev(device) < 0)
#endif
printf("Disk %s doesn't contain a valid "
"partition table\n", device);
} else {
list_table(0);
#if ENABLE_FEATURE_FDISK_WRITABLE
if (!LABEL_IS_SUN && g_partitions > 4) {
delete_partition(ext_index);
}
#endif
}
ret:
close_dev_fd();
}
/* for fdisk -l: try all things in /proc/partitions
that look like a partition name (do not end in a digit) */
static void
list_devs_in_proc_partititons(void)
{
FILE *procpt;
char line[100], ptname[100], devname[120], *s;
int ma, mi, sz;
procpt = fopen_or_warn("/proc/partitions", "r");
while (fgets(line, sizeof(line), procpt)) {
if (sscanf(line, " %u %u %u %[^\n ]",
&ma, &mi, &sz, ptname) != 4)
continue;
for (s = ptname; *s; s++)
continue;
/* note: excluding '0': e.g. mmcblk0 is not a partition name! */
if (s[-1] >= '1' && s[-1] <= '9')
continue;
sprintf(devname, "/dev/%s", ptname);
open_list_and_close(devname, 0);
}
#if ENABLE_FEATURE_CLEAN_UP
fclose(procpt);
#endif
}
#if ENABLE_FEATURE_FDISK_WRITABLE
static void
unknown_command(int c)
{
printf("%c: unknown command\n", c);
}
#endif
int fdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fdisk_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opt;
/*
* fdisk -v
* fdisk -l [-b sectorsize] [-u] device ...
* fdisk -s [partition] ...
* fdisk [-b sectorsize] [-u] device
*
* Options -C, -H, -S set the geometry.
*/
INIT_G();
close_dev_fd(); /* needed: fd 3 must not stay closed */
opt_complementary = "b+:C+:H+:S+"; /* numeric params */
opt = getopt32(argv, "b:C:H:lS:u" IF_FEATURE_FDISK_BLKSIZE("s"),
&sector_size, &user_cylinders, &user_heads, &user_sectors);
argv += optind;
if (opt & OPT_b) {
/* Ugly: this sector size is really per device,
* so cannot be combined with multiple disks,
* and the same goes for the C/H/S options.
*/
if (sector_size < 512
|| sector_size > 0x10000
|| (sector_size & (sector_size-1)) /* not power of 2 */
) {
bb_show_usage();
}
sector_offset = 2;
user_set_sector_size = 1;
}
if (user_heads <= 0 || user_heads >= 256)
user_heads = 0;
if (user_sectors <= 0 || user_sectors >= 64)
user_sectors = 0;
if (opt & OPT_u)
display_in_cyl_units = 0; // -u
#if ENABLE_FEATURE_FDISK_WRITABLE
if (opt & OPT_l) {
nowarn = 1;
#endif
if (*argv) {
listing = 1;
do {
open_list_and_close(*argv, 1);
} while (*++argv);
} else {
/* we don't have device names, */
/* use /proc/partitions instead */
list_devs_in_proc_partititons();
}
return 0;
#if ENABLE_FEATURE_FDISK_WRITABLE
}
#endif
#if ENABLE_FEATURE_FDISK_BLKSIZE
if (opt & OPT_s) {
int j;
nowarn = 1;
if (!argv[0])
bb_show_usage();
for (j = 0; argv[j]; j++) {
unsigned long long size;
fd = xopen(argv[j], O_RDONLY);
size = bb_BLKGETSIZE_sectors(fd) / 2;
close(fd);
if (argv[1])
printf("%llu\n", size);
else
printf("%s: %llu\n", argv[j], size);
}
return 0;
}
#endif
#if ENABLE_FEATURE_FDISK_WRITABLE
if (!argv[0] || argv[1])
bb_show_usage();
disk_device = argv[0];
get_boot(OPEN_MAIN);
if (LABEL_IS_OSF) {
/* OSF label, and no DOS label */
printf("Detected an OSF/1 disklabel on %s, entering "
"disklabel mode\n", disk_device);
bsd_select();
/*Why do we do this? It seems to be counter-intuitive*/
current_label_type = LABEL_DOS;
/* If we return we may want to make an empty DOS label? */
}
while (1) {
int c;
bb_putchar('\n');
c = 0x20 | read_nonempty("Command (m for help): ");
switch (c) {
case 'a':
if (LABEL_IS_DOS)
toggle_active(get_partition(1, g_partitions));
else if (LABEL_IS_SUN)
toggle_sunflags(get_partition(1, g_partitions),
0x01);
else if (LABEL_IS_SGI)
sgi_set_bootpartition(
get_partition(1, g_partitions));
else
unknown_command(c);
break;
case 'b':
if (LABEL_IS_SGI) {
printf("\nThe current boot file is: %s\n",
sgi_get_bootfile());
if (read_maybe_empty("Please enter the name of the "
"new boot file: ") == '\n')
printf("Boot file unchanged\n");
else
sgi_set_bootfile(line_ptr);
}
#if ENABLE_FEATURE_OSF_LABEL
else
bsd_select();
#endif
break;
case 'c':
if (LABEL_IS_DOS)
toggle_dos_compatibility_flag();
else if (LABEL_IS_SUN)
toggle_sunflags(get_partition(1, g_partitions),
0x10);
else if (LABEL_IS_SGI)
sgi_set_swappartition(
get_partition(1, g_partitions));
else
unknown_command(c);
break;
case 'd':
{
int j;
/* If sgi_label then don't use get_existing_partition,
let the user select a partition, since
get_existing_partition() only works for Linux-like
partition tables */
if (!LABEL_IS_SGI) {
j = get_existing_partition(1, g_partitions);
} else {
j = get_partition(1, g_partitions);
}
if (j >= 0)
delete_partition(j);
}
break;
case 'i':
if (LABEL_IS_SGI)
create_sgiinfo();
else
unknown_command(c);
case 'l':
list_types(get_sys_types());
break;
case 'm':
menu();
break;
case 'n':
new_partition();
break;
case 'o':
create_doslabel();
break;
case 'p':
list_table(0);
break;
case 'q':
if (ENABLE_FEATURE_CLEAN_UP)
close_dev_fd();
bb_putchar('\n');
return 0;
case 's':
#if ENABLE_FEATURE_SUN_LABEL
create_sunlabel();
#endif
break;
case 't':
change_sysid();
break;
case 'u':
change_units();
break;
case 'v':
verify();
break;
case 'w':
write_table(); /* does not return */
break;
#if ENABLE_FEATURE_FDISK_ADVANCED
case 'x':
if (LABEL_IS_SGI) {
printf("\n\tSorry, no experts menu for SGI "
"partition tables available\n\n");
} else
xselect();
break;
#endif
default:
unknown_command(c);
menu();
}
}
return 0;
#endif /* FEATURE_FDISK_WRITABLE */
}
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