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hush/sfdisk.c
Erik Andersen 93d6513d93 Some more minor updates to better use some gcc attributes. 
-Erik
2000-04-06 08:06:36 +00:00

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/* vi: set sw=4 ts=4: */
/*
* sfdisk version 3.0 - aeb - 950813
*
* Copyright (C) 1995 Andries E. Brouwer (aeb@cwi.nl)
*
* This program is free software. You can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation: either Version 1
* or (at your option) any later version.
*
* A.V. Le Blanc (LeBlanc@mcc.ac.uk) wrote Linux fdisk 1992-1994,
* patched by various people (faith@cs.unc.edu, martin@cs.unc.edu,
* leisner@sdsp.mc.xerox.com, esr@snark.thyrsus.com, aeb@cwi.nl)
* 1993-1995, with version numbers (as far as I have seen) 0.93 - 2.0e.
* This program had (head,sector,cylinder) as basic unit, and was
* (therefore) broken in several ways for the use on larger disks -
* for example, my last patch (from 2.0d to 2.0e) was required
* to allow a partition to cross cylinder 8064, and to write an
* extended partition past the 4GB mark.
*
* The current program is a rewrite from scratch, and I started a
* version numbering at 3.0.
* Andries Brouwer, aeb@cwi.nl, 950813
*
* Well, a good user interface is still lacking. On the other hand,
* many configurations cannot be handled by any other fdisk.
* I changed the name to sfdisk to prevent confusion. - aeb, 970501
*
* Changes:
* 19990319 - Arnaldo Carvalho de Melo <acme@conectiva.com.br> - i18n
*
* busyboxed by Erik Andersen <andersee@debian.org> -- I stipped out
* all the NLS, pulled in some includes, and made stuff smaller...
*/
#define PROGNAME "sfdisk"
#define VERSION "3.07"
#define DATE "990908"
#include "internal.h"
#include <stdio.h>
#include <stdlib.h> /* atoi, free */
#include <stdarg.h> /* varargs */
#include <unistd.h> /* read, write */
#include <fcntl.h> /* O_RDWR */
#include <errno.h> /* ERANGE */
#include <string.h> /* index() */
#include <ctype.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/unistd.h> /* _syscall */
#include <linux/hdreg.h> /* HDIO_GETGEO */
#include <linux/fs.h> /* BLKGETSIZE */
static const char sfdisk_usage[] =
"sfdisk [options] device ...\n"
"device: something like /dev/hda or /dev/sda\n"
"useful options:\n"
" -s [or --show-size]: list size of a partition\n"
" -c [or --id]: print or change partition Id\n"
" -l [or --list]: list partitions of each device\n"
" -d [or --dump]: idem, but in a format suitable for later input\n"
" -i [or --increment]: number cylinders etc. from 1 instead of from 0\n"
" -uS, -uB, -uC, -uM: accept/report in units of sectors/blocks/cylinders/MB\n"
" -T [or --list-types]:list the known partition types\n"
" -D [or --DOS]: for DOS-compatibility: waste a little space\n"
" -R [or --re-read]: make kernel reread partition table\n"
" -N# : change only the partition with number #\n"
" -n : do not actually write to disk\n"
" -O file : save the sectors that will be overwritten to file\n"
" -I file : restore these sectors again\n"
" -v [or --version]: print version\n"
" -? [or --help]: print this message\n"
"dangerous options:\n"
" -g [or --show-geometry]: print the kernel's idea of the geometry\n"
" -x [or --show-extended]: also list extended partitions on output\n\n"
" or expect descriptors for them on input\n"
" -L [or --Linux]: do not complain about things irrelevant for Linux\n"
" -q [or --quiet]: suppress warning messages\n"
" You can override the detected geometry using:\n"
" -C# [or --cylinders #]:set the number of cylinders to use\n"
" -H# [or --heads #]: set the number of heads to use\n"
" -S# [or --sectors #]: set the number of sectors to use\n"
"You can disable all consistency checking with:\n"
" -f [or --force]: do what I say, even if it is stupid\n";
/* common stuff for fdisk, cfdisk, sfdisk */
struct systypes {
unsigned char type;
char *name;
};
static struct systypes i386_sys_types[] = {
{0x00, "Empty"},
{0x01, "FAT12"},
{0x02, "XENIX root"},
{0x03, "XENIX usr"},
{0x04, "FAT16 <32M"},
{0x05, "Extended"}, /* DOS 3.3+ extended partition */
{0x06, "FAT16"}, /* DOS 16-bit >=32M */
{0x07, "HPFS/NTFS"}, /* OS/2 IFS, eg, HPFS or NTFS or QNX */
{0x08, "AIX"}, /* AIX boot (AIX -- PS/2 port or SplitDrive) */
{0x09, "AIX bootable"}, /* AIX data or Coherent */
{0x0a, "OS/2 Boot Manager"}, /* OS/2 Boot Manager */
{0x0b, "Win95 FAT32"},
{0x0c, "Win95 FAT32 (LBA)"}, /* LBA really is `Extended Int 13h' */
{0x0e, "Win95 FAT16 (LBA)"},
{0x0f, "Win95 Ext'd (LBA)"},
{0x10, "OPUS"},
{0x11, "Hidden FAT12"},
{0x12, "Compaq diagnostics"},
{0x14, "Hidden FAT16 <32M"},
{0x16, "Hidden FAT16"},
{0x17, "Hidden HPFS/NTFS"},
{0x18, "AST Windows swapfile"},
{0x1b, "Hidden Win95 FAT32"},
{0x1c, "Hidden Win95 FAT32 (LBA)"},
{0x1e, "Hidden Win95 FAT16 (LBA)"},
{0x24, "NEC DOS"},
{0x3c, "PartitionMagic recovery"},
{0x40, "Venix 80286"},
{0x41, "PPC PReP Boot"},
{0x42, "SFS"},
{0x4d, "QNX4.x"},
{0x4e, "QNX4.x 2nd part"},
{0x4f, "QNX4.x 3rd part"},
{0x50, "OnTrack DM"},
{0x51, "OnTrack DM6 Aux1"}, /* (or Novell) */
{0x52, "CP/M"}, /* CP/M or Microport SysV/AT */
{0x53, "OnTrack DM6 Aux3"},
{0x54, "OnTrackDM6"},
{0x55, "EZ-Drive"},
{0x56, "Golden Bow"},
{0x5c, "Priam Edisk"},
{0x61, "SpeedStor"},
{0x63, "GNU HURD or SysV"}, /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
{0x64, "Novell Netware 286"},
{0x65, "Novell Netware 386"},
{0x70, "DiskSecure Multi-Boot"},
{0x75, "PC/IX"},
{0x80, "Old Minix"}, /* Minix 1.4a and earlier */
{0x81, "Minix / old Linux"}, /* Minix 1.4b and later */
{0x82, "Linux swap"}, /* also Solaris */
{0x83, "Linux"},
{0x84, "OS/2 hidden C: drive"},
{0x85, "Linux extended"},
{0x86, "NTFS volume set"},
{0x87, "NTFS volume set"},
{0x93, "Amoeba"},
{0x94, "Amoeba BBT"}, /* (bad block table) */
{0xa0, "IBM Thinkpad hibernation"},
{0xa5, "BSD/386"},
{0xa6, "OpenBSD"},
{0xa7, "NeXTSTEP"},
{0xb7, "BSDI fs"},
{0xb8, "BSDI swap"},
{0xc1, "DRDOS/sec (FAT-12)"},
{0xc4, "DRDOS/sec (FAT-16 < 32M)"},
{0xc6, "DRDOS/sec (FAT-16)"},
{0xc7, "Syrinx"},
{0xdb, "CP/M / CTOS / ..."}, /* CP/M or Concurrent CP/M or Concurrent DOS or CTOS */
{0xe1, "DOS access"}, /* DOS access or SpeedStor 12-bit FAT extended partition */
{0xe3, "DOS R/O"}, /* DOS R/O or SpeedStor */
{0xe4, "SpeedStor"}, /* SpeedStor 16-bit FAT extended partition < 1024 cyl. */
{0xeb, "BeOS fs"},
{0xf1, "SpeedStor"},
{0xf4, "SpeedStor"}, /* SpeedStor large partition */
{0xf2, "DOS secondary"}, /* DOS 3.3+ secondary */
{0xfd, "Linux raid autodetect"}, /* New (2.2.x) raid partition with autodetect
using persistent superblock */
{0xfe, "LANstep"}, /* SpeedStor >1024 cyl. or LANstep */
{0xff, "BBT"}, /* Xenix Bad Block Table */
{0, 0}
};
#define SIZE(a) (sizeof(a)/sizeof(a[0]))
/*
* Table of contents:
* A. About seeking
* B. About sectors
* C. About heads, sectors and cylinders
* D. About system Ids
* E. About partitions
* F. The standard input
* G. The command line
* H. Listing the current situation
* I. Writing the new situation
*/
static int exit_status = 0;
static int force = 0; /* 1: do what I say, even if it is stupid ... */
static int quiet = 0; /* 1: suppress all warnings */
static int Linux = 0; /* 1: suppress warnings irrelevant for Linux */
static int DOS = 0; /* 1: shift extended partitions by #sectors, not 1 */
static int dump = 0; /* 1: list in a format suitable for later input */
static int verify = 0; /* 1: check that listed partition is reasonable */
static int no_write = 0; /* 1: do not actually write to disk */
static int no_reread = 0; /* 1: skip the BLKRRPART ioctl test at startup */
static int leave_last = 0; /* 1: don't allocate the last cylinder */
static int opt_list = 0;
static char *save_sector_file = NULL;
static char *restore_sector_file = NULL;
static void warn(char *s, ...) __attribute__ ((format (printf, 1, 2)));
static void warn(char *s, ...)
{
va_list p;
va_start(p, s);
fflush(stdout);
if (!quiet)
vfprintf(stderr, s, p);
va_end(p);
}
/*
* A. About seeking
*/
/*
* sseek: seek to specified sector - return 0 on failure
*
* For >4GB disks lseek needs a > 32bit arg, and we have to use llseek.
* On the other hand, a 32 bit sector number is OK until 2TB.
* The routines _llseek and sseek below are the only ones that
* know about the loff_t type.
*/
#ifndef __alpha__
static
_syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
#endif
static int sseek(char *dev, unsigned int fd, unsigned long s)
{
loff_t in, out;
in = ((loff_t) s << 9);
out = 1;
#ifndef __alpha__
if (_llseek(fd, in >> 32, in & 0xffffffff, &out, SEEK_SET) != 0) {
#else
if ((out = lseek(fd, in, SEEK_SET)) != in) {
#endif
perror("llseek");
errorMsg("seek error on %s - cannot seek to %lu\n", dev, s);
return 0;
}
if (in != out) {
errorMsg("seek error: wanted 0x%08x%08x, got 0x%08x%08x\n",
(uint) (in >> 32), (uint) (in & 0xffffffff),
(uint) (out >> 32), (uint) (out & 0xffffffff));
return 0;
}
return 1;
}
/*
* B. About sectors
*/
/*
* We preserve all sectors read in a chain - some of these will
* have to be modified and written back.
*/
struct sector {
struct sector *next;
unsigned long sectornumber;
int to_be_written;
char data[512];
} *sectorhead;
static void free_sectors(void)
{
struct sector *s;
while (sectorhead) {
s = sectorhead;
sectorhead = s->next;
free(s);
}
}
static struct sector *get_sector(char *dev, int fd, unsigned long sno)
{
struct sector *s;
for (s = sectorhead; s; s = s->next)
if (s->sectornumber == sno)
return s;
if (!sseek(dev, fd, sno))
return 0;
s = (struct sector *) xmalloc(sizeof(struct sector));
if (read(fd, s->data, sizeof(s->data)) != sizeof(s->data)) {
perror("read");
errorMsg("read error on %s - cannot read sector %lu\n", dev, sno);
free(s);
return 0;
}
s->next = sectorhead;
sectorhead = s;
s->sectornumber = sno;
s->to_be_written = 0;
return s;
}
static int msdos_signature(struct sector *s)
{
if (*(unsigned short *) (s->data + 0x1fe) != 0xaa55) {
errorMsg("ERROR: sector %lu does not have an msdos signature\n",
s->sectornumber);
return 0;
}
return 1;
}
static int write_sectors(char *dev, int fd)
{
struct sector *s;
for (s = sectorhead; s; s = s->next)
if (s->to_be_written) {
if (!sseek(dev, fd, s->sectornumber))
return 0;
if (write(fd, s->data, sizeof(s->data)) != sizeof(s->data)) {
perror("write");
errorMsg("write error on %s - cannot write sector %lu\n",
dev, s->sectornumber);
return 0;
}
s->to_be_written = 0;
}
return 1;
}
static void ulong_to_chars(unsigned long u, char *uu)
{
int i;
for (i = 0; i < 4; i++) {
uu[i] = (u & 0xff);
u >>= 8;
}
}
static unsigned long chars_to_ulong(unsigned char *uu)
{
int i;
unsigned long u = 0;
for (i = 3; i >= 0; i--)
u = (u << 8) | uu[i];
return u;
}
static int save_sectors(char *dev, int fdin)
{
struct sector *s;
char ss[516];
int fdout;
fdout = open(save_sector_file, O_WRONLY | O_CREAT, 0444);
if (fdout < 0) {
perror(save_sector_file);
errorMsg("cannot open partition sector save file (%s)\n",
save_sector_file);
return 0;
}
for (s = sectorhead; s; s = s->next)
if (s->to_be_written) {
ulong_to_chars(s->sectornumber, ss);
if (!sseek(dev, fdin, s->sectornumber))
return 0;
if (read(fdin, ss + 4, 512) != 512) {
perror("read");
errorMsg("read error on %s - cannot read sector %lu\n",
dev, s->sectornumber);
return 0;
}
if (write(fdout, ss, sizeof(ss)) != sizeof(ss)) {
perror("write");
errorMsg("write error on %s\n", save_sector_file);
return 0;
}
}
return 1;
}
static void reread_disk_partition(char *dev, int fd);
static int restore_sectors(char *dev)
{
int fdin, fdout, ct;
struct stat statbuf;
char *ss0, *ss;
unsigned long sno;
if (stat(restore_sector_file, &statbuf) < 0) {
perror(restore_sector_file);
errorMsg("cannot stat partition restore file (%s)\n",
restore_sector_file);
return 0;
}
if (statbuf.st_size % 516) {
errorMsg("partition restore file has wrong size - not restoring\n");
return 0;
}
if (!(ss = (char *) malloc(statbuf.st_size))) {
errorMsg("out of memory?\n");
return 0;
}
fdin = open(restore_sector_file, O_RDONLY);
if (fdin < 0) {
perror(restore_sector_file);
errorMsg("cannot open partition restore file (%s)\n",
restore_sector_file);
return 0;
}
if (read(fdin, ss, statbuf.st_size) != statbuf.st_size) {
perror("read");
errorMsg("error reading %s\n", restore_sector_file);
return 0;
}
fdout = open(dev, O_WRONLY);
if (fdout < 0) {
perror(dev);
errorMsg("cannot open device %s for writing\n", dev);
return 0;
}
ss0 = ss;
ct = statbuf.st_size / 516;
while (ct--) {
sno = chars_to_ulong(ss);
if (!sseek(dev, fdout, sno))
return 0;
if (write(fdout, ss + 4, 512) != 512) {
perror(dev);
errorMsg("error writing sector %lu on %s\n", sno, dev);
return 0;
}
ss += 516;
}
free(ss0);
reread_disk_partition(dev, fdout);
return 1;
}
/*
* C. About heads, sectors and cylinders
*/
/*
* <linux/hdreg.h> defines HDIO_GETGEO and
* struct hd_geometry {
* unsigned char heads;
* unsigned char sectors;
* unsigned short cylinders;
* unsigned long start;
* };
*/
/*
* We consider several geometries for a disk:
* B - the BIOS geometry, gotten from the kernel via HDIO_GETGEO
* F - the fdisk geometry
* U - the user-specified geometry
*
* 0 means unspecified / unknown
*/
struct geometry {
unsigned long cylindersize;
unsigned long heads, sectors, cylinders;
} B, F, U;
static void get_cylindersize(char *dev, int fd, int silent)
{
struct hd_geometry g;
int ioctl_ok = 0;
B.heads = B.sectors = B.cylinders = 0;
if (!ioctl(fd, HDIO_GETGEO, &g)) {
ioctl_ok = 1;
B.heads = g.heads;
B.sectors = g.sectors;
B.cylinders = g.cylinders;
}
if (U.heads)
B.heads = U.heads;
if (U.sectors)
B.sectors = U.sectors;
if (U.cylinders)
B.cylinders = U.cylinders;
B.cylindersize = B.heads * B.sectors;
if (ioctl_ok) {
if (g.start && !force) {
warn
("Warning: start=%ld - this looks like a partition rather than\n"
"the entire disk. Using fdisk on it is probably meaningless.\n"
"[Use the --force option if you really want this]\n",
g.start);
exit(1);
}
if (B.heads != g.heads)
warn("Warning: HDIO_GETGEO says that there are %d heads\n",
g.heads);
if (B.sectors != g.sectors)
warn("Warning: HDIO_GETGEO says that there are %d sectors\n",
g.sectors);
if (B.cylinders != g.cylinders)
warn("Warning: HDIO_GETGEO says that there are %d cylinders\n",
g.cylinders);
} else if (!silent)
if (!B.heads || !B.sectors || !B.cylinders)
printf("Disk %s: cannot get geometry\n", dev);
if (B.sectors > 63)
warn
("Warning: unlikely number of sectors (%ld - usually at most 63\n"
"This will give problems with all software that uses C/H/S addressing.\n",
B.sectors);
if (!silent)
printf("\nDisk %s: %lu cylinders, %lu heads, %lu sectors/track\n",
dev, B.cylinders, B.heads, B.sectors);
}
typedef struct {
unsigned char h, s, c;
} chs; /* has some c bits in s */
static chs zero_chs = { 0, 0, 0 };
typedef struct {
unsigned long h, s, c;
} longchs;
static longchs zero_longchs;
static chs longchs_to_chs(longchs aa, struct geometry G)
{
chs a;
if (aa.h < 256 && aa.s < 64 && aa.c < 1024) {
a.h = aa.h;
a.s = aa.s | ((aa.c >> 2) & 0xc0);
a.c = (aa.c & 0xff);
} else if (G.heads && G.sectors) {
a.h = G.heads - 1;
a.s = G.sectors | 0xc0;
a.c = 0xff;
} else
a = zero_chs;
return a;
}
static longchs chs_to_longchs(chs a)
{
longchs aa;
aa.h = a.h;
aa.s = (a.s & 0x3f);
aa.c = (a.s & 0xc0);
aa.c = (aa.c << 2) + a.c;
return aa;
}
static longchs ulong_to_longchs(unsigned long sno, struct geometry G)
{
longchs aa;
if (G.heads && G.sectors && G.cylindersize) {
aa.s = 1 + sno % G.sectors;
aa.h = (sno / G.sectors) % G.heads;
aa.c = sno / G.cylindersize;
return aa;
} else {
return zero_longchs;
}
}
//static unsigned long
//longchs_to_ulong (longchs aa, struct geometry G) {
// return (aa.c*G.cylindersize + aa.h*G.sectors + aa.s - 1);
//}
static chs ulong_to_chs(unsigned long sno, struct geometry G)
{
return longchs_to_chs(ulong_to_longchs(sno, G), G);
}
//static unsigned long
//chs_to_ulong (chs a, struct geometry G) {
// return longchs_to_ulong(chs_to_longchs(a), G);
//}
static int is_equal_chs(chs a, chs b)
{
return (a.h == b.h && a.s == b.s && a.c == b.c);
}
static int chs_ok(chs a, char *v, char *w)
{
longchs aa = chs_to_longchs(a);
int ret = 1;
if (is_equal_chs(a, zero_chs))
return 1;
if (B.heads && aa.h >= B.heads) {
warn("%s of partition %s has impossible value for head: "
"%ld (should be in 0-%ld)\n", w, v, aa.h, B.heads - 1);
ret = 0;
}
if (B.sectors && (aa.s == 0 || aa.s > B.sectors)) {
warn("%s of partition %s has impossible value for sector: "
"%ld (should be in 1-%ld)\n", w, v, aa.s, B.sectors);
ret = 0;
}
if (B.cylinders && aa.c >= B.cylinders) {
warn("%s of partition %s has impossible value for cylinders: "
"%ld (should be in 0-%ld)\n", w, v, aa.c, B.cylinders - 1);
ret = 0;
}
return ret;
}
/*
* D. About system Ids
*/
#define EMPTY_PARTITION 0
#define EXTENDED_PARTITION 5
#define WIN98_EXTENDED 0x0f
#define DM6_AUX1PARTITION 0x51
#define DM6_AUX3PARTITION 0x53
#define DM6_PARTITION 0x54
#define EZD_PARTITION 0x55
#define LINUX_SWAP 0x82
#define LINUX_NATIVE 0x83
#define LINUX_EXTENDED 0x85
#define BSD_PARTITION 0xa5
/* List of partition types now in i386_sys_types.c */
static const char *sysname(unsigned char type)
{
struct systypes *s;
for (s = i386_sys_types; s->name; s++)
if (s->type == type)
return s->name;
return "Unknown";
}
static void list_types(void)
{
struct systypes *s;
printf("Id Name\n\n");
for (s = i386_sys_types; s->name; s++)
printf("%2x %s\n", s->type, s->name);
}
static int is_extended(unsigned char type)
{
return (type == EXTENDED_PARTITION
|| type == LINUX_EXTENDED || type == WIN98_EXTENDED);
}
static int is_bsd(unsigned char type)
{
return (type == BSD_PARTITION);
}
/*
* E. About partitions
*/
/* MS/DOS partition */
struct partition {
unsigned char bootable; /* 0 or 0x80 */
chs begin_chs;
unsigned char sys_type;
chs end_chs;
unsigned int start_sect; /* starting sector counting from 0 */
unsigned int nr_sects; /* nr of sectors in partition */
};
/* Unfortunately, partitions are not aligned, and non-Intel machines
are unhappy with non-aligned integers. So, we need a copy by hand. */
static int copy_to_int(unsigned char *cp)
{
unsigned int m;
m = *cp++;
m += (*cp++ << 8);
m += (*cp++ << 16);
m += (*cp++ << 24);
return m;
}
static void copy_from_int(int m, char *cp)
{
*cp++ = (m & 0xff);
m >>= 8;
*cp++ = (m & 0xff);
m >>= 8;
*cp++ = (m & 0xff);
m >>= 8;
*cp++ = (m & 0xff);
}
static void copy_to_part(char *cp, struct partition *p)
{
p->bootable = *cp++;
p->begin_chs.h = *cp++;
p->begin_chs.s = *cp++;
p->begin_chs.c = *cp++;
p->sys_type = *cp++;
p->end_chs.h = *cp++;
p->end_chs.s = *cp++;
p->end_chs.c = *cp++;
p->start_sect = copy_to_int(cp);
p->nr_sects = copy_to_int(cp + 4);
}
static void copy_from_part(struct partition *p, char *cp)
{
*cp++ = p->bootable;
*cp++ = p->begin_chs.h;
*cp++ = p->begin_chs.s;
*cp++ = p->begin_chs.c;
*cp++ = p->sys_type;
*cp++ = p->end_chs.h;
*cp++ = p->end_chs.s;
*cp++ = p->end_chs.c;
copy_from_int(p->start_sect, cp);
copy_from_int(p->nr_sects, cp + 4);
}
/* Roughly speaking, Linux doesn't use any of the above fields except
for partition type, start sector and number of sectors. (However,
see also linux/drivers/scsi/fdomain.c.)
The only way partition type is used (in the kernel) is the comparison
for equality with EXTENDED_PARTITION (and these Disk Manager types). */
struct part_desc {
unsigned long start;
unsigned long size;
unsigned long sector, offset; /* disk location of this info */
struct partition p;
struct part_desc *ep; /* extended partition containing this one */
int ptype;
#define DOS_TYPE 0
#define BSD_TYPE 1
} zero_part_desc;
struct part_desc *outer_extended_partition(struct part_desc *p)
{
while (p->ep)
p = p->ep;
return p;
}
static int is_parent(struct part_desc *pp, struct part_desc *p)
{
while (p) {
if (pp == p)
return 1;
p = p->ep;
}
return 0;
}
struct disk_desc {
struct part_desc partitions[128];
int partno;
} oldp, newp;
/* determine where on the disk this information goes */
static void add_sector_and_offset(struct disk_desc *z)
{
int pno;
struct part_desc *p;
for (pno = 0; pno < z->partno; pno++) {
p = &(z->partitions[pno]);
p->offset = 0x1be + (pno % 4) * sizeof(struct partition);
p->sector = (p->ep ? p->ep->start : 0);
}
}
/* tell the kernel to reread the partition tables */
static int reread_ioctl(int fd)
{
if (ioctl(fd, BLKRRPART)) {
perror("BLKRRPART");
return -1;
}
return 0;
}
static int is_blockdev(int fd)
{
struct stat statbuf;
return (fstat(fd, &statbuf) == 0 && S_ISBLK(statbuf.st_mode));
}
/* reread after writing */
static void reread_disk_partition(char *dev, int fd)
{
printf("Re-reading the partition table ...\n");
fflush(stdout);
sync();
sleep(3); /* superfluous since 1.3.20 */
if (reread_ioctl(fd) && is_blockdev(fd))
printf("The command to re-read the partition table failed\n"
"Reboot your system now, before using mkfs\n");
if (close(fd)) {
perror(dev);
printf("Error closing %s\n", dev);
}
printf("\n");
}
/* find Linux name of this partition, assuming that it will have a name */
static int index_to_linux(int pno, struct disk_desc *z)
{
int i, ct = 1;
struct part_desc *p = &(z->partitions[0]);
for (i = 0; i < pno; i++, p++)
if (i < 4 || (p->size > 0 && !is_extended(p->p.sys_type)))
ct++;
return ct;
}
static int linux_to_index(int lpno, struct disk_desc *z)
{
int i, ct = 0;
struct part_desc *p = &(z->partitions[0]);
for (i = 0; i < z->partno && ct < lpno; i++, p++)
if ((i < 4 || (p->size > 0 && !is_extended(p->p.sys_type)))
&& ++ct == lpno)
return i;
return -1;
}
static int asc_to_index(char *pnam, struct disk_desc *z)
{
int pnum, pno;
if (*pnam == '#') {
pno = atoi(pnam + 1);
} else {
pnum = atoi(pnam);
pno = linux_to_index(pnum, z);
}
if (!(pno >= 0 && pno < z->partno))
fatalError("%s: no such partition\n", pnam);
return pno;
}
/*
* List partitions - in terms of sectors, blocks or cylinders
*/
#define F_SECTOR 1
#define F_BLOCK 2
#define F_CYLINDER 3
#define F_MEGABYTE 4
static int default_format = F_MEGABYTE;
static int specified_format = 0;
static int show_extended = 0;
static int one_only = 0;
static int one_only_pno;
static int increment = 0;
static void set_format(char c)
{
switch (c) {
default:
printf("unrecognized format - using sectors\n");
case 'S':
specified_format = F_SECTOR;
break;
case 'B':
specified_format = F_BLOCK;
break;
case 'C':
specified_format = F_CYLINDER;
break;
case 'M':
specified_format = F_MEGABYTE;
break;
}
}
static unsigned long unitsize(int format)
{
default_format = (B.cylindersize ? F_CYLINDER : F_MEGABYTE);
if (!format && !(format = specified_format))
format = default_format;
switch (format) {
default:
case F_CYLINDER:
if (B.cylindersize)
return B.cylindersize;
case F_SECTOR:
return 1;
case F_BLOCK:
return 2;
case F_MEGABYTE:
return 2048;
}
}
static unsigned long get_disksize(int format)
{
unsigned long cs = B.cylinders;
if (cs && leave_last)
cs--;
return (cs * B.cylindersize) / unitsize(format);
}
static void out_partition_header(char *dev, int format, struct geometry G)
{
if (dump) {
printf("# partition table of %s\n", dev);
printf("unit: sectors\n\n");
return;
}
default_format = (G.cylindersize ? F_CYLINDER : F_MEGABYTE);
if (!format && !(format = specified_format))
format = default_format;
switch (format) {
default:
printf("unimplemented format - using %s\n",
G.cylindersize ? "cylinders" : "sectors");
case F_CYLINDER:
if (G.cylindersize) {
printf("Units = cylinders of %lu bytes, blocks of 1024 bytes"
", counting from %d\n\n",
G.cylindersize << 9, increment);
printf
(" Device Boot Start End #cyls #blocks Id System\n");
break;
}
/* fall through */
case F_SECTOR:
printf("Units = sectors of 512 bytes, counting from %d\n\n",
increment);
printf
(" Device Boot Start End #sectors Id System\n");
break;
case F_BLOCK:
printf("Units = blocks of 1024 bytes, counting from %d\n\n",
increment);
printf
(" Device Boot Start End #blocks Id System\n");
break;
case F_MEGABYTE:
printf("Units = megabytes of 1048576 bytes, blocks of 1024 bytes"
", counting from %d\n\n", increment);
printf
(" Device Boot Start End MB #blocks Id System\n");
break;
}
}
static void
out_rounddown(int width, unsigned long n, unsigned long unit, int inc)
{
printf("%*lu", width, inc + n / unit);
if (unit != 1)
putchar((n % unit) ? '+' : ' ');
putchar(' ');
}
static void
out_roundup(int width, unsigned long n, unsigned long unit, int inc)
{
if (n == (unsigned long) (-1))
printf("%*s", width, "-");
else
printf("%*lu", width, inc + n / unit);
if (unit != 1)
putchar(((n + 1) % unit) ? '-' : ' ');
putchar(' ');
}
static void
out_roundup_size(int width, unsigned long n, unsigned long unit)
{
printf("%*lu", width, (n + unit - 1) / unit);
if (unit != 1)
putchar((n % unit) ? '-' : ' ');
putchar(' ');
}
static int get_fdisk_geometry(struct part_desc *p)
{
chs b = p->p.end_chs;
longchs bb = chs_to_longchs(b);
F.heads = bb.h + 1;
F.sectors = bb.s;
F.cylindersize = F.heads * F.sectors;
return (F.sectors != B.sectors || F.heads != B.heads);
}
static void
out_partition(char *dev, int format, struct part_desc *p,
struct disk_desc *z, struct geometry G)
{
unsigned long start, end, size;
int pno, lpno;
if (!format && !(format = specified_format))
format = default_format;
pno = p - &(z->partitions[0]); /* our index */
lpno = index_to_linux(pno, z); /* name of next one that has a name */
if (pno == linux_to_index(lpno, z)) /* was that us? */
printf("%8s%-2u", dev, lpno); /* yes */
else if (show_extended)
printf(" - ");
else
return;
putchar(dump ? ':' : ' ');
start = p->start;
end = p->start + p->size - 1;
size = p->size;
if (dump) {
printf(" start=%9lu", start);
printf(", size=%8lu", size);
if (p->ptype == DOS_TYPE) {
printf(", Id=%2x", p->p.sys_type);
if (p->p.bootable == 0x80)
printf(", bootable");
}
printf("\n");
return;
}
if (p->ptype != DOS_TYPE || p->p.bootable == 0)
printf(" ");
else if (p->p.bootable == 0x80)
printf(" * ");
else
printf(" ? "); /* garbage */
switch (format) {
case F_CYLINDER:
if (G.cylindersize) {
out_rounddown(6, start, G.cylindersize, increment);
out_roundup(6, end, G.cylindersize, increment);
out_roundup_size(6, size, G.cylindersize);
out_rounddown(8, size, 2, 0);
break;
}
/* fall through */
default:
case F_SECTOR:
out_rounddown(9, start, 1, increment);
out_roundup(9, end, 1, increment);
out_rounddown(9, size, 1, 0);
break;
case F_BLOCK:
#if 0
printf("%8lu,%3lu ",
p->sector / 2, ((p->sector & 1) ? 512 : 0) + p->offset);
#endif
out_rounddown(8, start, 2, increment);
out_roundup(8, end, 2, increment);
out_rounddown(8, size, 2, 0);
break;
case F_MEGABYTE:
out_rounddown(5, start, 2048, increment);
out_roundup(5, end, 2048, increment);
out_roundup_size(5, size, 2048);
out_rounddown(8, size, 2, 0);
break;
}
if (p->ptype == DOS_TYPE) {
printf(" %2x %s\n", p->p.sys_type, sysname(p->p.sys_type));
} else {
printf("\n");
}
/* Is chs as we expect? */
if (!quiet && p->ptype == DOS_TYPE) {
chs a, b;
longchs aa, bb;
a = (size ? ulong_to_chs(start, G) : zero_chs);
b = p->p.begin_chs;
aa = chs_to_longchs(a);
bb = chs_to_longchs(b);
if (a.s && !is_equal_chs(a, b))
printf
("\t\tstart: (c,h,s) expected (%ld,%ld,%ld) found (%ld,%ld,%ld)\n",
aa.c, aa.h, aa.s, bb.c, bb.h, bb.s);
a = (size ? ulong_to_chs(end, G) : zero_chs);
b = p->p.end_chs;
aa = chs_to_longchs(a);
bb = chs_to_longchs(b);
if (a.s && !is_equal_chs(a, b))
printf
("\t\tend: (c,h,s) expected (%ld,%ld,%ld) found (%ld,%ld,%ld)\n",
aa.c, aa.h, aa.s, bb.c, bb.h, bb.s);
if (G.cylinders && G.cylinders < 1024 && bb.c > G.cylinders)
printf
("partition ends on cylinder %ld, beyond the end of the disk\n",
bb.c);
}
}
static void out_partitions(char *dev, struct disk_desc *z)
{
struct part_desc *p;
int pno, format = 0;
if (z->partno == 0)
printf("No partitions found\n");
else {
for (pno = 0; pno < z->partno; pno++) {
p = &(z->partitions[pno]);
if (p->size != 0 && p->p.sys_type != 0) {
if (get_fdisk_geometry(p))
printf
("Warning: The first partition looks like it was made\n"
" for C/H/S=*/%ld/%ld (instead of %ld/%ld/%ld).\n"
"For this listing I'll assume that geometry.\n",
F.heads, F.sectors, B.cylinders, B.heads,
B.sectors);
break;
}
}
out_partition_header(dev, format, F);
for (pno = 0; pno < z->partno; pno++) {
out_partition(dev, format, &(z->partitions[pno]), z, F);
if (show_extended && pno % 4 == 3)
printf("\n");
}
}
}
static int disj(struct part_desc *p, struct part_desc *q)
{
return ((p->start + p->size <= q->start)
|| (is_extended(p->p.sys_type)
&& q->start + q->size <= p->start + p->size));
}
static char *pnumber(struct part_desc *p, struct disk_desc *z)
{
static char buf[20];
int this, next;
struct part_desc *p0 = &(z->partitions[0]);
this = index_to_linux(p - p0, z);
next = index_to_linux(p - p0 + 1, z);
if (next > this)
sprintf(buf, "%d", this);
else
sprintf(buf, "[%d]", this);
return buf;
}
static int partitions_ok(struct disk_desc *z)
{
struct part_desc *partitions = &(z->partitions[0]), *p, *q;
int partno = z->partno;
#define PNO(p) pnumber(p, z)
/* Have at least 4 partitions been defined? */
if (partno < 4) {
if (!partno)
fatalError("no partition table present.\n");
else
fatalError("strange, only %d partitions defined.\n", partno);
return 0;
}
/* Are the partitions of size 0 marked empty?
And do they have start = 0? And bootable = 0? */
for (p = partitions; p - partitions < partno; p++)
if (p->size == 0) {
if (p->p.sys_type != EMPTY_PARTITION)
warn
("Warning: partition %s has size 0 but is not marked Empty\n",
PNO(p));
else if (p->p.bootable != 0)
warn("Warning: partition %s has size 0 and is bootable\n",
PNO(p));
else if (p->p.start_sect != 0)
warn
("Warning: partition %s has size 0 and nonzero start\n",
PNO(p));
/* all this is probably harmless, no error return */
}
/* Are the logical partitions contained in their extended partitions? */
for (p = partitions + 4; p < partitions + partno; p++)
if (p->ptype == DOS_TYPE)
if (p->size && !is_extended(p->p.sys_type)) {
q = p->ep;
if (p->start < q->start
|| p->start + p->size > q->start + q->size) {
warn("Warning: partition %s ", PNO(p));
warn("is not contained in partition %s\n", PNO(q));
return 0;
}
}
/* Are the data partitions mutually disjoint? */
for (p = partitions; p < partitions + partno; p++)
if (p->size && !is_extended(p->p.sys_type))
for (q = p + 1; q < partitions + partno; q++)
if (q->size && !is_extended(q->p.sys_type))
if (!((p->start > q->start) ? disj(q, p) : disj(p, q))) {
warn("Warning: partitions %s ", PNO(p));
warn("and %s overlap\n", PNO(q));
return 0;
}
/* Are the data partitions and the extended partition
table sectors disjoint? */
for (p = partitions; p < partitions + partno; p++)
if (p->size && !is_extended(p->p.sys_type))
for (q = partitions; q < partitions + partno; q++)
if (is_extended(q->p.sys_type))
if (p->start <= q->start
&& p->start + p->size > q->start) {
warn("Warning: partition %s contains part of ",
PNO(p));
warn("the partition table (sector %lu),\n",
q->start);
warn("and will destroy it when filled\n");
return 0;
}
/* Do they start past zero and end before end-of-disk? */
{
unsigned long ds = get_disksize(F_SECTOR);
for (p = partitions; p < partitions + partno; p++)
if (p->size) {
if (p->start == 0) {
warn("Warning: partition %s starts at sector 0\n",
PNO(p));
return 0;
}
if (p->size && p->start + p->size > ds) {
warn
("Warning: partition %s extends past end of disk\n",
PNO(p));
return 0;
}
}
}
/* At most one chain of DOS extended partitions ? */
/* It seems that the OS/2 fdisk has the additional requirement
that the extended partition must be the fourth one */
{
int ect = 0;
for (p = partitions; p < partitions + 4; p++)
if (p->p.sys_type == EXTENDED_PARTITION)
ect++;
if (ect > 1 && !Linux) {
warn
("Among the primary partitions, at most one can be extended\n");
warn(" (although this is not a problem under Linux)\n");
return 0;
}
}
/*
* Do all partitions start at a cylinder boundary ?
* (this is not required for Linux)
* The first partition starts after MBR.
* Logical partitions start slightly after the containing extended partn.
*/
if (B.cylindersize) {
for (p = partitions; p < partitions + partno; p++)
if (p->size) {
if (p->start % B.cylindersize != 0
&& (!p->ep
|| p->start / B.cylindersize !=
p->ep->start / B.cylindersize)
&& (p->p.start_sect >= B.cylindersize)) {
warn("Warning: partition %s does not start "
"at a cylinder boundary\n", PNO(p));
if (!Linux)
return 0;
}
if ((p->start + p->size) % B.cylindersize) {
warn("Warning: partition %s does not end "
"at a cylinder boundary\n", PNO(p));
if (!Linux)
return 0;
}
}
}
/* Usually, one can boot only from primary partitions. */
/* In fact, from a unique one only. */
/* do not warn about bootable extended partitions -
often LILO is there */
{
int pno = -1;
for (p = partitions; p < partitions + partno; p++)
if (p->p.bootable) {
if (pno == -1)
pno = p - partitions;
else if (p - partitions < 4) {
warn
("Warning: more than one primary partition is marked "
"bootable (active)\n"
"This does not matter for LILO, but the DOS MBR will "
"not boot this disk.\n");
break;
}
if (p - partitions >= 4) {
warn
("Warning: usually one can boot from primary partitions "
"only\nLILO disregards the `bootable' flag.\n");
break;
}
}
if (pno == -1 || pno >= 4)
warn
("Warning: no primary partition is marked bootable (active)\n"
"This does not matter for LILO, but the DOS MBR will "
"not boot this disk.\n");
}
/* Is chs as we expect? */
for (p = partitions; p < partitions + partno; p++)
if (p->ptype == DOS_TYPE) {
chs a, b;
longchs aa, bb;
a = p->size ? ulong_to_chs(p->start, B) : zero_chs;
b = p->p.begin_chs;
aa = chs_to_longchs(a);
bb = chs_to_longchs(b);
if (!chs_ok(b, PNO(p), "start"))
return 0;
if (a.s && !is_equal_chs(a, b))
warn
("partition %s: start: (c,h,s) expected (%ld,%ld,%ld) found (%ld,%ld,%ld)\n",
PNO(p), aa.c, aa.h, aa.s, bb.c, bb.h, bb.s);
a =
p->size ? ulong_to_chs(p->start + p->size - 1,
B) : zero_chs;
b = p->p.end_chs;
aa = chs_to_longchs(a);
bb = chs_to_longchs(b);
if (!chs_ok(b, PNO(p), "end"))
return 0;
if (a.s && !is_equal_chs(a, b))
warn
("partition %s: end: (c,h,s) expected (%ld,%ld,%ld) found (%ld,%ld,%ld)\n",
PNO(p), aa.c, aa.h, aa.s, bb.c, bb.h, bb.s);
if (B.cylinders && B.cylinders < 1024 && bb.c > B.cylinders)
warn
("partition %s ends on cylinder %ld, beyond the end of the disk\n",
PNO(p), bb.c);
}
return 1;
#undef PNO
}
static void
extended_partition(char *dev, int fd, struct part_desc *ep,
struct disk_desc *z)
{
char *cp;
struct sector *s;
unsigned long start, here, next;
int i, moretodo = 1;
struct partition p;
struct part_desc *partitions = &(z->partitions[0]);
int pno = z->partno;
here = start = ep->start;
while (moretodo) {
moretodo = 0;
if (!(s = get_sector(dev, fd, here)))
break;
if (!msdos_signature(s))
break;
cp = s->data + 0x1be;
if (pno + 4 >= SIZE(z->partitions)) {
printf("too many partitions - ignoring those past nr (%d)\n",
pno - 1);
break;
}
next = 0;
for (i = 0; i < 4; i++, cp += sizeof(struct partition)) {
partitions[pno].sector = here;
partitions[pno].offset = cp - s->data;
partitions[pno].ep = ep;
copy_to_part(cp, &p);
if (is_extended(p.sys_type)) {
partitions[pno].start = start + p.start_sect;
if (next)
printf("tree of partitions?\n");
else
next = partitions[pno].start; /* follow `upper' branch */
moretodo = 1;
} else {
partitions[pno].start = here + p.start_sect;
}
partitions[pno].size = p.nr_sects;
partitions[pno].ptype = DOS_TYPE;
partitions[pno].p = p;
pno++;
}
here = next;
}
z->partno = pno;
}
#define BSD_DISKMAGIC (0x82564557UL)
#define BSD_MAXPARTITIONS 8
#define BSD_FS_UNUSED 0
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
struct bsd_disklabel {
u32 d_magic;
char d_junk1[4];
char d_typename[16];
char d_packname[16];
char d_junk2[92];
u32 d_magic2;
char d_junk3[2];
u16 d_npartitions; /* number of partitions in following */
char d_junk4[8];
struct bsd_partition { /* the partition table */
u32 p_size; /* number of sectors in partition */
u32 p_offset; /* starting sector */
u32 p_fsize; /* filesystem basic fragment size */
u8 p_fstype; /* filesystem type, see below */
u8 p_frag; /* filesystem fragments per block */
u16 p_cpg; /* filesystem cylinders per group */
} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
};
static void
bsd_partition(char *dev, int fd, struct part_desc *ep, struct disk_desc *z)
{
struct bsd_disklabel *l;
struct bsd_partition *bp, *bp0;
unsigned long start = ep->start;
struct sector *s;
struct part_desc *partitions = &(z->partitions[0]);
int pno = z->partno;
if (!(s = get_sector(dev, fd, start + 1)))
return;
l = (struct bsd_disklabel *) (s->data);
if (l->d_magic != BSD_DISKMAGIC)
return;
bp = bp0 = &l->d_partitions[0];
while (bp - bp0 <= BSD_MAXPARTITIONS) {
if (pno + 1 >= SIZE(z->partitions)) {
printf("too many partitions - ignoring those "
"past nr (%d)\n", pno - 1);
break;
}
if (bp->p_fstype != BSD_FS_UNUSED) {
partitions[pno].start = bp->p_offset;
partitions[pno].size = bp->p_size;
partitions[pno].sector = start + 1;
partitions[pno].offset = (char *) bp - (char *) bp0;
partitions[pno].ep = 0;
partitions[pno].ptype = BSD_TYPE;
pno++;
}
bp++;
}
z->partno = pno;
}
static int
msdos_partition(char *dev, int fd, unsigned long start,
struct disk_desc *z)
{
int i;
char *cp;
struct partition pt;
struct sector *s;
struct part_desc *partitions = &(z->partitions[0]);
int pno = z->partno;
if (!(s = get_sector(dev, fd, start)))
return 0;
if (!msdos_signature(s))
return 0;
cp = s->data + 0x1be;
copy_to_part(cp, &pt);
/* If I am not mistaken, recent kernels will hide this from us,
so we will never actually see traces of a Disk Manager */
if (pt.sys_type == DM6_PARTITION
|| pt.sys_type == EZD_PARTITION
|| pt.sys_type == DM6_AUX1PARTITION
|| pt.sys_type == DM6_AUX3PARTITION) {
printf("detected Disk Manager - unable to handle that\n");
return 0;
}
{
unsigned int sig = *(unsigned short *) (s->data + 2);
if (sig <= 0x1ae
&& *(unsigned short *) (s->data + sig) == 0x55aa
&& (1 & *(unsigned char *) (s->data + sig + 2))) {
printf("DM6 signature found - giving up\n");
return 0;
}
}
for (pno = 0; pno < 4; pno++, cp += sizeof(struct partition)) {
partitions[pno].sector = start;
partitions[pno].offset = cp - s->data;
copy_to_part(cp, &pt);
partitions[pno].start = start + pt.start_sect;
partitions[pno].size = pt.nr_sects;
partitions[pno].ep = 0;
partitions[pno].p = pt;
}
z->partno = pno;
for (i = 0; i < 4; i++) {
if (is_extended(partitions[i].p.sys_type)) {
if (!partitions[i].size) {
printf("strange..., an extended partition of size 0?\n");
continue;
}
extended_partition(dev, fd, &partitions[i], z);
}
if (is_bsd(partitions[i].p.sys_type)) {
if (!partitions[i].size) {
printf("strange..., a BSD partition of size 0?\n");
continue;
}
bsd_partition(dev, fd, &partitions[i], z);
}
}
return 1;
}
static int
osf_partition(char *dev, int fd, unsigned long start, struct disk_desc *z)
{
return 0;
}
static int
sun_partition(char *dev, int fd, unsigned long start, struct disk_desc *z)
{
return 0;
}
static int
amiga_partition(char *dev, int fd, unsigned long start,
struct disk_desc *z)
{
return 0;
}
static void get_partitions(char *dev, int fd, struct disk_desc *z)
{
z->partno = 0;
if (!msdos_partition(dev, fd, 0, z)
&& !osf_partition(dev, fd, 0, z)
&& !sun_partition(dev, fd, 0, z)
&& !amiga_partition(dev, fd, 0, z)) {
printf(" %s: unrecognized partition\n", dev);
return;
}
}
static int write_partitions(char *dev, int fd, struct disk_desc *z)
{
struct sector *s;
struct part_desc *partitions = &(z->partitions[0]), *p;
int pno = z->partno;
if (no_write) {
printf("-n flag was given: Nothing changed\n");
exit(0);
}
for (p = partitions; p < partitions + pno; p++) {
s = get_sector(dev, fd, p->sector);
if (!s)
return 0;
s->to_be_written = 1;
copy_from_part(&(p->p), s->data + p->offset);
*(unsigned short *) (&(s->data[0x1fe])) = 0xaa55;
}
if (save_sector_file) {
if (!save_sectors(dev, fd)) {
fatalError("Failed saving the old sectors - aborting\n");
return 0;
}
}
if (!write_sectors(dev, fd)) {
errorMsg("Failed writing the partition on %s\n", dev);
return 0;
}
return 1;
}
/*
* F. The standard input
*/
/*
* Input format:
* <start> <size> <type> <bootable> <c,h,s> <c,h,s>
* Fields are separated by whitespace or comma or semicolon possibly
* followed by whitespace; initial and trailing whitespace is ignored.
* Numbers can be octal, decimal or hexadecimal, decimal is default
* The <c,h,s> parts can (and probably should) be omitted.
* Bootable is specified as [*|-], with as default not-bootable.
* Type is given in hex, without the 0x prefix, or is [E|S|L|X], where
* L (LINUX_NATIVE (83)) is the default, S is LINUX_SWAP (82), and E
* is EXTENDED_PARTITION (5), X is LINUX_EXTENDED (85).
* The default value of start is the first nonassigned sector/cylinder/...
* The default value of size is as much as possible (until next
* partition or end-of-disk).
* .: end of chain of extended partitions.
*
* On interactive input an empty line means: all defaults.
* Otherwise empty lines are ignored.
*/
static int eof, eob;
struct dumpfld {
int fldno;
char *fldname;
int is_bool;
} dumpflds[] = {
{
0, "start", 0}, {
1, "size", 0}, {
2, "Id", 0}, {
3, "bootable", 1}, {
4, "bh", 0}, {
5, "bs", 0}, {
6, "bc", 0}, {
7, "eh", 0}, {
8, "es", 0}, {
9, "ec", 0}
};
/*
* Read a line, split it into fields
*
* (some primitive handwork, but a more elaborate parser seems
* unnecessary)
*/
#define RD_EOF (-1)
#define RD_CMD (-2)
static int
read_stdin(unsigned char **fields, unsigned char *line, int fieldssize,
int linesize)
{
unsigned char *lp, *ip;
int c, fno;
/* boolean true and empty string at start */
line[0] = '*';
line[1] = 0;
for (fno = 0; fno < fieldssize; fno++)
fields[fno] = line + 1;
fno = 0;
/* read a line from stdin */
lp = fgets(line + 2, linesize, stdin);
if (lp == NULL) {
eof = 1;
return RD_EOF;
}
if (!(lp = index(lp, '\n')))
fatalError("long or incomplete input line - quitting\n");
*lp = 0;
/* remove comments, if any */
if ((lp = index(line + 2, '#')) != 0)
*lp = 0;
/* recognize a few commands - to be expanded */
if (!strcmp(line + 2, "unit: sectors")) {
specified_format = F_SECTOR;
return RD_CMD;
}
/* dump style? - then bad input is fatal */
if ((ip = index(line + 2, ':')) != 0) {
struct dumpfld *d;
nxtfld:
ip++;
while (isspace(*ip))
ip++;
if (*ip == 0)
return fno;
for (d = dumpflds; d - dumpflds < SIZE(dumpflds); d++) {
if (!strncmp(ip, d->fldname, strlen(d->fldname))) {
ip += strlen(d->fldname);
while (isspace(*ip))
ip++;
if (d->is_bool)
fields[d->fldno] = line;
else if (*ip == '=') {
while (isspace(*++ip));
fields[d->fldno] = ip;
while (isalnum(*ip)) /* 0x07FF */
ip++;
} else
fatalError("input error: `=' expected after %s field\n",
d->fldname);
if (fno <= d->fldno)
fno = d->fldno + 1;
if (*ip == 0)
return fno;
if (*ip != ',' && *ip != ';')
fatalError
("input error: unexpected character %c after %s field\n",
*ip, d->fldname);
*ip = 0;
goto nxtfld;
}
}
fatalError("unrecognized input: %s\n", ip);
}
/* split line into fields */
lp = ip = line + 2;
fields[fno++] = lp;
while ((c = *ip++) != 0) {
if (!lp[-1] && (c == '\t' || c == ' '));
else if (c == '\t' || c == ' ' || c == ',' || c == ';') {
*lp++ = 0;
if (fno < fieldssize)
fields[fno++] = lp;
continue;
} else
*lp++ = c;
}
if (lp == fields[fno - 1])
fno--;
return fno;
}
/* read a number, use default if absent */
static int get_ul(char *u, unsigned long *up, unsigned long def, int base)
{
char *nu;
if (*u) {
errno = 0;
*up = strtoul(u, &nu, base);
if (errno == ERANGE) {
printf("number too big\n");
return -1;
}
if (*nu) {
printf("trailing junk after number\n");
return -1;
}
} else
*up = def;
return 0;
}
/* There are two common ways to structure extended partitions:
as nested boxes, and as a chain. Sometimes the partitions
must be given in order. Sometimes all logical partitions
must lie inside the outermost extended partition.
NESTED: every partition is contained in the surrounding partitions
and is disjoint from all others.
CHAINED: every data partition is contained in the surrounding partitions
and disjoint from all others, but extended partitions may lie outside
(insofar as allowed by all_logicals_inside_outermost_extended).
ONESECTOR: all data partitions are mutually disjoint; extended partitions
each use one sector only (except perhaps for the outermost one).
*/
static int partitions_in_order = 0;
static int all_logicals_inside_outermost_extended = 1;
static enum { NESTED, CHAINED, ONESECTOR } boxes = NESTED;
/* find the default value for <start> - assuming entire units */
static unsigned long
first_free(int pno, int is_extended, struct part_desc *ep, int format,
unsigned long mid, struct disk_desc *z)
{
unsigned long ff, fff;
unsigned long unit = unitsize(format);
struct part_desc *partitions = &(z->partitions[0]), *pp = 0;
/* if containing ep undefined, look at its container */
if (ep && ep->p.sys_type == EMPTY_PARTITION)
ep = ep->ep;
if (ep) {
if (boxes == NESTED || (boxes == CHAINED && !is_extended))
pp = ep;
else if (all_logicals_inside_outermost_extended)
pp = outer_extended_partition(ep);
}
#if 0
ff = pp ? (pp->start + unit - 1) / unit : 0;
#else
/* rounding up wastes almost an entire cylinder - round down
and leave it to compute_start_sect() to fix the difference */
ff = pp ? pp->start / unit : 0;
#endif
/* MBR and 1st sector of an extended partition are never free */
if (unit == 1)
ff++;
again:
for (pp = partitions; pp < partitions + pno; pp++) {
if (!is_parent(pp, ep) && pp->size > 0) {
if ((partitions_in_order || pp->start / unit <= ff
|| (mid && pp->start / unit <= mid))
&& (fff = (pp->start + pp->size + unit - 1) / unit) > ff) {
ff = fff;
goto again;
}
}
}
return ff;
}
/* find the default value for <size> - assuming entire units */
static unsigned long
max_length(int pno, int is_extended, struct part_desc *ep, int format,
unsigned long start, struct disk_desc *z)
{
unsigned long fu;
unsigned long unit = unitsize(format);
struct part_desc *partitions = &(z->partitions[0]), *pp = 0;
/* if containing ep undefined, look at its container */
if (ep && ep->p.sys_type == EMPTY_PARTITION)
ep = ep->ep;
if (ep) {
if (boxes == NESTED || (boxes == CHAINED && !is_extended))
pp = ep;
else if (all_logicals_inside_outermost_extended)
pp = outer_extended_partition(ep);
}
fu = pp ? (pp->start + pp->size) / unit : get_disksize(format);
for (pp = partitions; pp < partitions + pno; pp++)
if (!is_parent(pp, ep) && pp->size > 0
&& pp->start / unit >= start && pp->start / unit < fu)
fu = pp->start / unit;
return (fu > start) ? fu - start : 0;
}
/* compute starting sector of a partition inside an extended one */
/* ep is 0 or points to surrounding extended partition */
static int compute_start_sect(struct part_desc *p, struct part_desc *ep)
{
unsigned long base;
int inc = (DOS && B.sectors) ? B.sectors : 1;
int delta;
if (ep && p->start + p->size >= ep->start + 1)
delta = p->start - ep->start - inc;
else if (p->start == 0 && p->size > 0)
delta = -inc;
else
delta = 0;
if (delta < 0) {
p->start -= delta;
p->size += delta;
if (is_extended(p->p.sys_type) && boxes == ONESECTOR)
p->size = inc;
else if ((int) (p->size) <= 0) {
warn("no room for partition descriptor\n");
return 0;
}
}
base = (!ep ? 0
: (is_extended(p->p.sys_type) ?
outer_extended_partition(ep) : ep)->start);
p->ep = ep;
if (p->p.sys_type == EMPTY_PARTITION && p->size == 0) {
p->p.start_sect = 0;
p->p.begin_chs = zero_chs;
p->p.end_chs = zero_chs;
} else {
p->p.start_sect = p->start - base;
p->p.begin_chs = ulong_to_chs(p->start, B);
p->p.end_chs = ulong_to_chs(p->start + p->size - 1, B);
}
p->p.nr_sects = p->size;
return 1;
}
/* build the extended partition surrounding a given logical partition */
static int
build_surrounding_extended(struct part_desc *p, struct part_desc *ep,
struct disk_desc *z)
{
int inc = (DOS && B.sectors) ? B.sectors : 1;
int format = F_SECTOR;
struct part_desc *p0 = &(z->partitions[0]), *eep = ep->ep;
if (boxes == NESTED) {
ep->start = first_free(ep - p0, 1, eep, format, p->start, z);
ep->size = max_length(ep - p0, 1, eep, format, ep->start, z);
if (ep->start > p->start
|| ep->start + ep->size < p->start + p->size) {
warn("cannot build surrounding extended partition\n");
return 0;
}
} else {
ep->start = p->start;
if (boxes == CHAINED)
ep->size = p->size;
else
ep->size = inc;
}
ep->p.nr_sects = ep->size;
ep->p.bootable = 0;
ep->p.sys_type = EXTENDED_PARTITION;
if (!compute_start_sect(ep, eep) || !compute_start_sect(p, ep)) {
ep->p.sys_type = EMPTY_PARTITION;
ep->size = 0;
return 0;
}
return 1;
}
static int
read_line(int pno, struct part_desc *ep, char *dev, int interactive,
struct disk_desc *z)
{
unsigned char line[1000];
unsigned char *fields[11];
int fno, pct = pno % 4;
struct part_desc p, *orig;
unsigned long ff, ff1, ul, ml, ml1, def;
int format, lpno, is_extd;
if (eof || eob)
return -1;
lpno = index_to_linux(pno, z);
if (interactive) {
if (pct == 0 && (show_extended || pno == 0))
warn("\n");
warn("%8s%d: ", dev, lpno);
}
/* read input line - skip blank lines when reading from a file */
do {
fno = read_stdin(fields, line, SIZE(fields), SIZE(line));
} while (fno == RD_CMD || (fno == 0 && !interactive));
if (fno == RD_EOF) {
return -1;
} else if (fno > 10 && *(fields[10]) != 0) {
printf("too many input fields\n");
return 0;
}
if (fno == 1 && !strcmp(fields[0], ".")) {
eob = 1;
return -1;
}
/* use specified format, but round to cylinders if F_MEGABYTE specified */
format = 0;
if (B.cylindersize && specified_format == F_MEGABYTE)
format = F_CYLINDER;
orig = (one_only ? &(oldp.partitions[pno]) : 0);
p = zero_part_desc;
p.ep = ep;
/* first read the type - we need to know whether it is extended */
/* stop reading when input blank (defaults) and all is full */
is_extd = 0;
if (fno == 0) { /* empty line */
if (orig && is_extended(orig->p.sys_type))
is_extd = 1;
ff = first_free(pno, is_extd, ep, format, 0, z);
ml = max_length(pno, is_extd, ep, format, ff, z);
if (ml == 0 && is_extd == 0) {
is_extd = 1;
ff = first_free(pno, is_extd, ep, format, 0, z);
ml = max_length(pno, is_extd, ep, format, ff, z);
}
if (ml == 0 && pno >= 4) {
/* no free blocks left - don't read any further */
warn("No room for more\n");
return -1;
}
}
if (fno < 3 || !*(fields[2]))
ul = orig ? orig->p.sys_type :
(is_extd || (pno > 3 && pct == 1 && show_extended))
? EXTENDED_PARTITION : LINUX_NATIVE;
else if (!strcmp(fields[2], "L"))
ul = LINUX_NATIVE;
else if (!strcmp(fields[2], "S"))
ul = LINUX_SWAP;
else if (!strcmp(fields[2], "E"))
ul = EXTENDED_PARTITION;
else if (!strcmp(fields[2], "X"))
ul = LINUX_EXTENDED;
else if (get_ul(fields[2], &ul, LINUX_NATIVE, 16))
return 0;
if (ul > 255) {
warn("Illegal type\n");
return 0;
}
p.p.sys_type = ul;
is_extd = is_extended(ul);
/* find start */
ff = first_free(pno, is_extd, ep, format, 0, z);
ff1 = ff * unitsize(format);
def = orig ? orig->start : (pno > 4 && pct > 1) ? 0 : ff1;
if (fno < 1 || !*(fields[0]))
p.start = def;
else {
if (get_ul(fields[0], &ul, def / unitsize(0), 0))
return 0;
p.start = ul * unitsize(0);
p.start -= (p.start % unitsize(format));
}
/* find length */
ml =
max_length(pno, is_extd, ep, format, p.start / unitsize(format),
z);
ml1 = ml * unitsize(format);
def = orig ? orig->size : (pno > 4 && pct > 1) ? 0 : ml1;
if (fno < 2 || !*(fields[1]))
p.size = def;
else {
if (get_ul(fields[1], &ul, def / unitsize(0), 0))
return 0;
p.size = ul * unitsize(0) + unitsize(format) - 1;
p.size -= (p.size % unitsize(format));
}
if (p.size > ml1) {
warn("Warning: exceeds max allowable size (%lu)\n",
ml1 / unitsize(0));
if (!force)
return 0;
}
if (p.size == 0 && pno >= 4 && (fno < 2 || !*(fields[1]))) {
warn("Warning: empty partition\n");
if (!force)
return 0;
}
p.p.nr_sects = p.size;
if (p.size == 0 && !orig) {
if (fno < 1 || !*(fields[0]))
p.start = 0;
if (fno < 3 || !*(fields[2]))
p.p.sys_type = EMPTY_PARTITION;
}
if (p.start < ff1 && p.size > 0) {
warn("Warning: bad partition start (earliest %lu)\n",
(ff1 + unitsize(0) - 1) / unitsize(0));
if (!force)
return 0;
}
if (fno < 4 || !*(fields[3]))
ul = (orig ? orig->p.bootable : 0);
else if (!strcmp(fields[3], "-"))
ul = 0;
else if (!strcmp(fields[3], "*") || !strcmp(fields[3], "+"))
ul = 0x80;
else {
warn("unrecognized bootable flag - choose - or *\n");
return 0;
}
p.p.bootable = ul;
if (ep && ep->p.sys_type == EMPTY_PARTITION) {
if (!build_surrounding_extended(&p, ep, z))
return 0;
} else if (!compute_start_sect(&p, ep))
return 0;
{
longchs aa = chs_to_longchs(p.p.begin_chs), bb;
if (fno < 5) {
bb = aa;
} else if (fno < 7) {
warn("partial c,h,s specification?\n");
return 0;
} else if (get_ul(fields[4], &bb.c, aa.c, 0) ||
get_ul(fields[5], &bb.h, aa.h, 0) ||
get_ul(fields[6], &bb.s, aa.s, 0))
return 0;
p.p.begin_chs = longchs_to_chs(bb, B);
}
{
longchs aa = chs_to_longchs(p.p.end_chs), bb;
if (fno < 8) {
bb = aa;
} else if (fno < 10) {
warn("partial c,h,s specification?\n");
return 0;
} else if (get_ul(fields[7], &bb.c, aa.c, 0) ||
get_ul(fields[8], &bb.h, aa.h, 0) ||
get_ul(fields[9], &bb.s, aa.s, 0))
return 0;
p.p.end_chs = longchs_to_chs(bb, B);
}
if (pno > 3 && p.size && show_extended
&& p.p.sys_type != EMPTY_PARTITION
&& (is_extended(p.p.sys_type) != (pct == 1))) {
warn("Extended partition not where expected\n");
if (!force)
return 0;
}
z->partitions[pno] = p;
if (pno >= z->partno)
z->partno += 4; /* reqd for out_partition() */
if (interactive)
out_partition(dev, 0, &(z->partitions[pno]), z, B);
return 1;
}
/* ep either points to the extended partition to contain this one,
or to the empty partition that may become extended or is 0 */
static int
read_partition(char *dev, int interactive, int pno, struct part_desc *ep,
struct disk_desc *z)
{
struct part_desc *p = &(z->partitions[pno]);
int i;
if (one_only) {
*p = oldp.partitions[pno];
if (one_only_pno != pno)
goto ret;
} else if (!show_extended && pno > 4 && pno % 4)
goto ret;
while (!(i = read_line(pno, ep, dev, interactive, z)))
if (!interactive)
fatalError("bad input\n");
if (i < 0) {
p->ep = ep;
return 0;
}
ret:
p->ep = ep;
if (pno >= z->partno)
z->partno += 4;
return 1;
}
static void
read_partition_chain(char *dev, int interactive, struct part_desc *ep,
struct disk_desc *z)
{
int i, base;
eob = 0;
while (1) {
base = z->partno;
if (base + 4 > SIZE(z->partitions)) {
printf("too many partitions\n");
break;
}
for (i = 0; i < 4; i++)
if (!read_partition(dev, interactive, base + i, ep, z))
return;
for (i = 0; i < 4; i++) {
ep = &(z->partitions[base + i]);
if (is_extended(ep->p.sys_type) && ep->size)
break;
}
if (i == 4) {
/* nothing found - maybe an empty partition is going
to be extended */
if (one_only || show_extended)
break;
ep = &(z->partitions[base + 1]);
if (ep->size || ep->p.sys_type != EMPTY_PARTITION)
break;
}
}
}
static void read_input(char *dev, int interactive, struct disk_desc *z)
{
int i;
struct part_desc *partitions = &(z->partitions[0]), *ep;
for (i = 0; i < SIZE(z->partitions); i++)
partitions[i] = zero_part_desc;
z->partno = 0;
if (interactive)
warn
("Input in the following format; absent fields get a default value.\n"
"<start> <size> <type [E,S,L,X,hex]> <bootable [-,*]> <c,h,s> <c,h,s>\n"
"Usually you only need to specify <start> and <size> (and perhaps <type>).\n");
eof = 0;
for (i = 0; i < 4; i++)
read_partition(dev, interactive, i, 0, z);
for (i = 0; i < 4; i++) {
ep = partitions + i;
if (is_extended(ep->p.sys_type) && ep->size)
read_partition_chain(dev, interactive, ep, z);
}
add_sector_and_offset(z);
}
/*
* G. The command line
*/
static void version(void)
{
printf("%s %s %s (aeb@cwi.nl, %s)\n", PROGNAME, "version", VERSION,
DATE);
}
static char short_opts[] = "cdfgilnqsu:vx?1A::C:DH:I:LN:O:RS:TU::V";
#define PRINT_ID 0400
#define CHANGE_ID 01000
static const struct option long_opts[] = {
{"change-id", no_argument, NULL, 'c' + CHANGE_ID},
{"print-id", no_argument, NULL, 'c' + PRINT_ID},
{"id", no_argument, NULL, 'c'},
{"dump", no_argument, NULL, 'd'},
{"force", no_argument, NULL, 'f'},
{"show-geometry", no_argument, NULL, 'g'},
{"increment", no_argument, NULL, 'i'},
{"list", no_argument, NULL, 'l'},
{"quiet", no_argument, NULL, 'q'},
{"show-size", no_argument, NULL, 's'},
{"unit", required_argument, NULL, 'u'},
{"version", no_argument, NULL, 'v'},
{"show-extended", no_argument, NULL, 'x'},
{"help", no_argument, NULL, '?'},
{"one-only", no_argument, NULL, '1'},
{"cylinders", required_argument, NULL, 'C'},
{"heads", required_argument, NULL, 'H'},
{"sectors", required_argument, NULL, 'S'},
{"activate", optional_argument, NULL, 'A'},
{"DOS", no_argument, NULL, 'D'},
{"Linux", no_argument, NULL, 'L'},
{"re-read", no_argument, NULL, 'R'},
{"list-types", no_argument, NULL, 'T'},
{"unhide", optional_argument, NULL, 'U'},
{"no-reread", no_argument, NULL, 160},
{"IBM", no_argument, NULL, 161},
{"leave-last", no_argument, NULL, 161},
/* undocumented flags - not all completely implemented */
{"in-order", no_argument, NULL, 128},
{"not-in-order", no_argument, NULL, 129},
{"inside-outer", no_argument, NULL, 130},
{"not-inside-outer", no_argument, NULL, 131},
{"nested", no_argument, NULL, 132},
{"chained", no_argument, NULL, 133},
{"onesector", no_argument, NULL, 134},
{NULL, 0, NULL, 0}
};
/* default devices to list */
static struct devd {
char *pref, *letters;
} defdevs[] = {
{
"hd", "abcdefgh"}, {
"sd", "abcde"}, {
"xd", "ab"}, {
"ed", "abcd"}
};
static int is_ide_cdrom(char *device)
{
/* 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. So try to be careful.
This only works since 2.1.73. */
FILE *procf;
char buf[100];
struct stat statbuf;
sprintf(buf, "/proc/ide/%s/media", device + 5);
procf = fopen(buf, "r");
if (procf != NULL && fgets(buf, sizeof(buf), procf))
return !strncmp(buf, "cdrom", 5);
/* Now when this proc file does not exist, skip the
device when it is read-only. */
if (stat(device, &statbuf) == 0)
return (statbuf.st_mode & 0222) == 0;
return 0;
}
static void do_list(char *dev, int silent);
static void do_size(char *dev, int silent);
static void do_geom(char *dev, int silent);
static void do_fdisk(char *dev);
static void do_reread(char *dev);
static void do_change_id(char *dev, char *part, char *id);
static void do_unhide(char **av, int ac, char *arg);
static void do_activate(char **av, int ac, char *arg);
static int total_size;
extern int sfdisk_main(int argc, char **argv)
{
int c;
char *dev;
int opt_size = 0;
int opt_out_geom = 0;
int opt_reread = 0;
int activate = 0;
int do_id = 0;
int unhide = 0;
char *activatearg = 0;
char *unhidearg = 0;
if (argc < 1)
usage(sfdisk_usage);
while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) !=
-1) {
switch (c) {
case 'f':
force = 1;
break; /* does not imply quiet */
case 'g':
opt_out_geom = 1;
break;
case 'i':
increment = 1;
break;
case 'c':
case 'c' + PRINT_ID:
case 'c' + CHANGE_ID:
do_id = c;
break;
case 'd':
dump = 1; /* fall through */
case 'l':
opt_list = 1;
break;
case 'n':
no_write = 1;
break;
case 'q':
quiet = 1;
break;
case 's':
opt_size = 1;
break;
case 'u':
set_format(*optarg);
break;
case 'v':
version();
exit(0);
case 'x':
show_extended = 1;
break;
case 'A':
activatearg = optarg;
activate = 1;
break;
case 'C':
U.cylinders = atoi(optarg);
break;
case 'D':
DOS = 1;
break;
case 'H':
U.heads = atoi(optarg);
break;
case 'L':
Linux = 1;
break;
case 'N':
one_only = atoi(optarg);
break;
case 'I':
restore_sector_file = optarg;
break;
case 'O':
save_sector_file = optarg;
break;
case 'R':
opt_reread = 1;
break;
case 'S':
U.sectors = atoi(optarg);
break;
case 'T':
list_types();
exit(0);
case 'U':
unhidearg = optarg;
unhide = 1;
break;
case 'V':
verify = 1;
break;
case '?':
default:
usage(sfdisk_usage);
/* undocumented flags */
case 128:
partitions_in_order = 1;
break;
case 129:
partitions_in_order = 0;
break;
case 130:
all_logicals_inside_outermost_extended = 1;
break;
case 131:
all_logicals_inside_outermost_extended = 0;
break;
case 132:
boxes = NESTED;
break;
case 133:
boxes = CHAINED;
break;
case 134:
boxes = ONESECTOR;
break;
/* more flags */
case 160:
no_reread = 1;
break;
case 161:
leave_last = 1;
break;
}
}
if (optind == argc && (opt_list || opt_out_geom || opt_size || verify)) {
struct devd *dp;
char *lp;
char device[10];
total_size = 0;
for (dp = defdevs; dp - defdevs < SIZE(defdevs); dp++) {
lp = dp->letters;
while (*lp) {
sprintf(device, "/dev/%s%c", dp->pref, *lp++);
if (!strcmp(dp->pref, "hd") && is_ide_cdrom(device))
continue;
if (opt_out_geom)
do_geom(device, 1);
if (opt_size)
do_size(device, 1);
if (opt_list || verify)
do_list(device, 1);
}
}
if (opt_size)
printf("total: %d blocks\n", total_size);
exit(exit_status);
}
if (optind == argc)
usage(sfdisk_usage);
if (opt_list || opt_out_geom || opt_size || verify) {
while (optind < argc) {
if (opt_out_geom)
do_geom(argv[optind], 0);
if (opt_size)
do_size(argv[optind], 0);
if (opt_list || verify)
do_list(argv[optind], 0);
optind++;
}
exit(exit_status);
}
if (activate) {
do_activate(argv + optind, argc - optind, activatearg);
exit(exit_status);
}
if (unhide) {
do_unhide(argv + optind, argc - optind, unhidearg);
exit(exit_status);
}
if (do_id) {
if ((do_id & PRINT_ID) != 0 && optind != argc - 2)
fatalError("usage: sfdisk --print-id device partition-number\n");
else if ((do_id & CHANGE_ID) != 0 && optind != argc - 3)
fatalError
("usage: sfdisk --change-id device partition-number Id\n");
else if (optind != argc - 3 && optind != argc - 2)
fatalError("usage: sfdisk --id device partition-number [Id]\n");
do_change_id(argv[optind], argv[optind + 1],
(optind == argc - 2) ? 0 : argv[optind + 2]);
exit(exit_status);
}
if (optind != argc - 1)
fatalError("can specify only one device (except with -l or -s)\n");
dev = argv[optind];
if (opt_reread)
do_reread(dev);
else if (restore_sector_file)
restore_sectors(dev);
else
do_fdisk(dev);
return (TRUE);
}
/*
* H. Listing the current situation
*/
static int my_open(char *dev, int rw, int silent)
{
int fd, mode;
mode = (rw ? O_RDWR : O_RDONLY);
fd = open(dev, mode);
if (fd < 0 && !silent) {
perror(dev);
fatalError("cannot open %s %s\n", dev,
rw ? "read-write" : "for reading");
}
return fd;
}
static void do_list(char *dev, int silent)
{
int fd;
struct disk_desc *z;
fd = my_open(dev, 0, silent);
if (fd < 0)
return;
z = &oldp;
free_sectors();
get_cylindersize(dev, fd, dump ? 1 : opt_list ? 0 : 1);
get_partitions(dev, fd, z);
if (opt_list)
out_partitions(dev, z);
if (verify) {
if (partitions_ok(z))
warn("%s: OK\n", dev);
else
exit_status = 1;
}
}
static void do_geom(char *dev, int silent)
{
int fd;
struct hd_geometry g;
fd = my_open(dev, 0, silent);
if (fd < 0)
return;
/* get_cylindersize(dev, fd, silent); */
if (!ioctl(fd, HDIO_GETGEO, &g))
printf("%s: %d cylinders, %d heads, %d sectors/track\n",
dev, g.cylinders, g.heads, g.sectors);
else
printf("%s: unknown geometry\n", dev);
}
/* for compatibility with earlier fdisk: provide option -s */
static void do_size(char *dev, int silent)
{
int fd;
long size;
fd = my_open(dev, 0, silent);
if (fd < 0)
return;
if (ioctl(fd, BLKGETSIZE, &size)) {
if (!silent) {
perror(dev);
fatalError("BLKGETSIZE ioctl failed for %s\n", dev);
}
return;
}
size /= 2; /* convert sectors to blocks */
/* a CDROM drive without mounted CD yields MAXINT */
if (silent && size == ((1 << 30) - 1))
return;
if (silent)
printf("%s: %9ld\n", dev, size);
else
printf("%ld\n", size);
total_size += size;
}
/*
* Activate: usually one wants to have a single primary partition
* to be active. OS/2 fdisk makes non-bootable logical partitions
* active - I don't know what that means to OS/2 Boot Manager.
*
* Call: activate /dev/hda 2 5 7 make these partitions active
* and the remaining ones inactive
* Or: sfdisk -A /dev/hda 2 5 7
*
* If only a single partition must be active, one may also use the form
* sfdisk -A2 /dev/hda
*
* With "activate /dev/hda" or "sfdisk -A /dev/hda" the active partitions
* are listed but not changed. To get zero active partitions, use
* "activate /dev/hda none" or "sfdisk -A /dev/hda none".
* Use something like `echo ",,,*" | sfdisk -N2 /dev/hda' to only make
* /dev/hda2 active, without changing other partitions.
*
* A warning will be given if after the change not precisely one primary
* partition is active.
*
* The present syntax was chosen to be (somewhat) compatible with the
* activate from the LILO package.
*/
static void set_active(struct disk_desc *z, char *pnam)
{
int pno;
pno = asc_to_index(pnam, z);
z->partitions[pno].p.bootable = 0x80;
}
static void do_activate(char **av, int ac, char *arg)
{
char *dev = av[0];
int fd;
int rw, i, pno, lpno;
struct disk_desc *z;
z = &oldp;
rw = (!no_write && (arg || ac > 1));
fd = my_open(dev, rw, 0);
free_sectors();
get_cylindersize(dev, fd, 1);
get_partitions(dev, fd, z);
if (!arg && ac == 1) {
/* list active partitions */
for (pno = 0; pno < z->partno; pno++) {
if (z->partitions[pno].p.bootable) {
lpno = index_to_linux(pno, z);
if (pno == linux_to_index(lpno, z))
printf("%s%d\n", dev, lpno);
else
printf("%s#%d\n", dev, pno);
if (z->partitions[pno].p.bootable != 0x80)
warn("bad active byte: 0x%x instead of 0x80\n",
z->partitions[pno].p.bootable);
}
}
} else {
/* clear `active byte' everywhere */
for (pno = 0; pno < z->partno; pno++)
z->partitions[pno].p.bootable = 0;
/* then set where desired */
if (ac == 1)
set_active(z, arg);
else
for (i = 1; i < ac; i++)
set_active(z, av[i]);
/* then write to disk */
if (write_partitions(dev, fd, z))
warn("Done\n\n");
else
exit_status = 1;
}
i = 0;
for (pno = 0; pno < z->partno && pno < 4; pno++)
if (z->partitions[pno].p.bootable)
i++;
if (i != 1)
warn
("You have %d active primary partitions. This does not matter for LILO,\n"
"but the DOS MBR will only boot a disk with 1 active partition.\n",
i);
}
static void set_unhidden(struct disk_desc *z, char *pnam)
{
int pno;
unsigned char id;
pno = asc_to_index(pnam, z);
id = z->partitions[pno].p.sys_type;
if (id == 0x11 || id == 0x14 || id == 0x16 || id == 0x17)
id -= 0x10;
else
fatalError("partition %s has id %x and is not hidden\n", pnam, id);
z->partitions[pno].p.sys_type = id;
}
/*
* maybe remove and make part of --change-id
*/
static void do_unhide(char **av, int ac, char *arg)
{
char *dev = av[0];
int fd, rw, i;
struct disk_desc *z;
z = &oldp;
rw = !no_write;
fd = my_open(dev, rw, 0);
free_sectors();
get_cylindersize(dev, fd, 1);
get_partitions(dev, fd, z);
/* unhide where desired */
if (ac == 1)
set_unhidden(z, arg);
else
for (i = 1; i < ac; i++)
set_unhidden(z, av[i]);
/* then write to disk */
if (write_partitions(dev, fd, z))
warn("Done\n\n");
else
exit_status = 1;
}
static void do_change_id(char *dev, char *pnam, char *id)
{
int fd, rw, pno;
struct disk_desc *z;
unsigned long i;
z = &oldp;
rw = !no_write;
fd = my_open(dev, rw, 0);
free_sectors();
get_cylindersize(dev, fd, 1);
get_partitions(dev, fd, z);
pno = asc_to_index(pnam, z);
if (id == 0) {
printf("%x\n", z->partitions[pno].p.sys_type);
return;
}
i = strtoul(id, NULL, 16);
if (i > 255)
fatalError("Bad Id %lx\n", i);
z->partitions[pno].p.sys_type = i;
if (write_partitions(dev, fd, z))
warn("Done\n\n");
else
exit_status = 1;
}
static void do_reread(char *dev)
{
int fd;
fd = my_open(dev, 0, 0);
if (reread_ioctl(fd))
printf("This disk is currently in use.\n");
}
/*
* I. Writing the new situation
*/
static void do_fdisk(char *dev)
{
int fd;
int c, answer;
struct stat statbuf;
int interactive = isatty(0);
struct disk_desc *z;
if (stat(dev, &statbuf) < 0) {
perror(dev);
fatalError("Fatal error: cannot find %s\n", dev);
}
if (!S_ISBLK(statbuf.st_mode)) {
warn("Warning: %s is not a block device\n", dev);
no_reread = 1;
}
fd = my_open(dev, !no_write, 0);
if (!no_write && !no_reread) {
warn("Checking that no-one is using this disk right now ...\n");
if (reread_ioctl(fd)) {
printf
("\nThis disk is currently in use - repartitioning is probably a bad idea."
"Umount all file systems, and swapoff all swap partitions on this disk."
"Use the --no-reread flag to suppress this check.\n");
if (!force) {
printf("Use the --force flag to overrule all checks.\n");
exit(1);
}
} else
warn("OK");
}
z = &oldp;
free_sectors();
get_cylindersize(dev, fd, 0);
get_partitions(dev, fd, z);
printf("Old situation:\n");
out_partitions(dev, z);
if (one_only && (one_only_pno = linux_to_index(one_only, z)) < 0)
fatalError("Partition %d does not exist, cannot change it\n", one_only);
z = &newp;
while (1) {
read_input(dev, interactive, z);
printf("New situation:\n");
out_partitions(dev, z);
if (!partitions_ok(z) && !force) {
if (!interactive)
fatalError("I don't like these partitions - nothing changed.\n"
"(If you really want this, use the --force option.)\n");
else
printf
("I don't like this - probably you should answer No\n");
}
ask:
if (interactive) {
if (no_write)
printf("Are you satisfied with this? [ynq] ");
else
printf("Do you want to write this to disk? [ynq] ");
answer = c = getchar();
while (c != '\n' && c != EOF)
c = getchar();
if (c == EOF)
printf("\nsfdisk: premature end of input\n");
if (c == EOF || answer == 'q' || answer == 'Q') {
fatalError("Quitting - nothing changed\n");
} else if (answer == 'n' || answer == 'N') {
continue;
} else if (answer == 'y' || answer == 'Y') {
break;
} else {
printf("Please answer one of y,n,q\n");
goto ask;
}
} else
break;
}
if (write_partitions(dev, fd, z))
printf("Successfully wrote the new partition table\n\n");
else
exit_status = 1;
reread_disk_partition(dev, fd);
warn
("If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)\n"
"to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1\n"
"(See fdisk(8).)\n");
sync(); /* superstition */
sleep(3);
exit(exit_status);
}
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