minix/commands/repartition/repartition.c

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2005-04-21 16:53:53 +02:00
/* repartition 1.18 - Load a partition table Author: Kees J. Bot
* 30 Nov 1991
*/
#define nil 0
#include <stdio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/partition.h>
#include <machine/partition.h>
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#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <limits.h>
#define DEV_FD0 0x200
#define SECTOR_SIZE 512
#define arraysize(a) (sizeof(a)/sizeof((a)[0]))
#define arraylimit(a) ((a) + arraysize(a))
char *arg0;
char *dev_file; /* Device to repartition. */
#ifndef S_ISLNK
/* There were no symlinks in medieval times. */
#define lstat stat
#endif
void report(const char *label)
{
fprintf(stderr, "%s: %s: %s\n", arg0, label, strerror(errno));
}
void fatal(const char *label)
{
report(label);
exit(1);
}
#define MINOR_d0p0s0 128
void partsort(struct part_entry *pe)
/* DOS has the misguided idea that partition tables must be sorted. */
{
int i,j;
struct part_entry tmp;
for (i = 0; i < NR_PARTITIONS; i++)
for (j = 0; j < NR_PARTITIONS-1; j++)
if ((pe[j].sysind == NO_PART && pe[j+1].sysind != NO_PART) ||
(pe[j].lowsec > pe[j+1].lowsec && pe[j+1].sysind != NO_PART)) {
tmp = pe[j];
pe[j] = pe[j+1];
pe[j+1] = tmp;
}
}
char *finddev(dev_t device)
/* Find the device next to dev_file with the given device number. */
{
DIR *dp;
struct dirent *de;
static char name[PATH_MAX];
char *np;
size_t nlen;
struct stat st;
if ((np= strrchr(dev_file, '/')) == nil) np= dev_file; else np++;
nlen= np - dev_file;
if (nlen > PATH_MAX - NAME_MAX - 1) {
fprintf(stderr, "%s: %s: Name is way too long\n",
arg0, dev_file);
exit(1);
}
memcpy(name, dev_file, nlen);
if ((dp= opendir("/dev")) == nil) fatal("/dev");
while ((de= readdir(dp)) != nil) {
strcpy(name+nlen, de->d_name);
if (lstat(name, &st) == 0
&& (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode))
&& st.st_rdev == device
) {
closedir(dp);
return name;
}
}
fprintf(stderr, "%s: Can't find partition devices associated with %s\n",
arg0, dev_file);
exit(1);
}
#define DSETP 0
#define DGETP 1
int diocntl(dev_t device, int request, struct part_geom *entry)
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/* Get or set the geometry of a device. */
{
char *name;
int r, f, err;
name= finddev(device);
if ((f= open(name, O_RDONLY)) < 0) return -1;
r= ioctl(f, request == DSETP ? DIOCSETP : DIOCGETP, (void *) entry);
err= errno;
(void) close(f);
errno= err;
return r;
}
struct part_geom geometry; /* Geometry of the device. */
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void print_chs(unsigned long sector)
{
unsigned secspcyl = geometry.heads * geometry.sectors;
int delta= 0;
if (sector == -1) { sector= 0; delta= -1; }
printf(" %5d/%03d/%02d",
(int) (sector / secspcyl),
(int) (sector % secspcyl) / geometry.sectors,
(int) (sector % geometry.sectors) + delta);
}
void show_part(char *name, unsigned long base, unsigned long size)
{
int i;
static int len= 0;
if (len == 0) {
len= strlen(name) + 3;
printf("device");
for (i = 6; i < len; i++) fputc(' ', stdout);
printf(
" first last base size kb\n");
}
printf("%s", name);
for (i = strlen(name); i < len; i++) fputc(' ', stdout);
print_chs(base);
print_chs(base + size - 1);
printf(" %9lu %9lu %9lu\n", base, size, size / (1024/SECTOR_SIZE));
}
int main(int argc, char **argv)
{
struct stat hdst;
struct part_geom whole, entry;
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struct part_entry table[4], *pe;
int drive, par = 0, device, incr;
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int partf;
char *table_file;
int hd_major, hd_minor;
int needsort;
int shrink; /* True if partitions are shrinked to fit. */
unsigned long base, size, limit;
if ((arg0= strrchr(argv[0], '/')) == nil) arg0= argv[0]; else arg0++;
if (argc < 2 || argc > 3) {
fprintf(stderr,
"Usage: %s device [partition-file]\n", arg0);
exit(1);
}
dev_file= argv[1];
table_file= argv[argc - 1];
shrink= (argc == 2);
if (stat(dev_file, &hdst) < 0) fatal(dev_file);
/* Geometry (to print nice numbers.) */
if (diocntl(hdst.st_rdev, DGETP, &geometry) < 0) fatal(dev_file);
if (!S_ISBLK(hdst.st_mode)) {
fprintf(stderr, "%s: %s is not a device\n", arg0, dev_file);
exit(1);
}
hd_major= major(hdst.st_rdev);
hd_minor= minor(hdst.st_rdev);
if (hd_minor >= MINOR_d0p0s0) {
errno= EINVAL;
fatal(dev_file);
}
if (hd_major == major(DEV_FD0)) {
/* HD is actually a floppy. */
if (hd_minor >= 4) {
errno= EINVAL;
fatal(dev_file);
}
device= hd_minor + (28 << 2);
incr= 4;
needsort= 0;
} else
if (hd_minor % (1 + NR_PARTITIONS) == 0) {
/* Partitioning hd0, hd5, ... */
device= hd_minor + 1;
incr= 1;
needsort= 1;
} else {
/* Subpartitioning hd[1-4], hd[6-9], ... */
drive= hd_minor / (1 + NR_PARTITIONS);
par= hd_minor % (1 + NR_PARTITIONS) - 1;
device= MINOR_d0p0s0
+ (drive * NR_PARTITIONS + par) * NR_PARTITIONS;
if (device + NR_PARTITIONS - 1 > BYTE) {
errno= EINVAL;
fatal(dev_file);
}
incr= 1;
needsort= 0;
}
/* Device is now the first of the minor devices to be repartitioned. */
/* Read the partition table from the boot block. */
if ((partf= open(table_file, O_RDONLY)) < 0
|| lseek(partf, (off_t) PART_TABLE_OFF, SEEK_SET) == -1
|| (par= read(partf, (char *) table, (int) sizeof(table))) < 0
) fatal(table_file);
if (par < sizeof(table)) {
fprintf(stderr, "%s: %s does not contain a partition table\n",
arg0, table_file);
exit(1);
}
if (needsort) partsort(table);
/* Show the geometry of the affected drive or partition. */
if (diocntl(hdst.st_rdev, DGETP, &whole) < 0) fatal(dev_file);
/* Use sector numbers. */
base = whole.base / SECTOR_SIZE;
size = whole.size / SECTOR_SIZE;
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limit = base + size;
show_part(dev_file, base, size);
/* Send the partition table entries to the device driver. */
for (par= 0; par < NR_PARTITIONS; par++, device+= incr) {
pe = &table[par];
if (shrink && pe->size != 0) {
/* Shrink the partition entry to fit within the
* enclosing device just like the driver does.
*/
unsigned long part_limit= pe->lowsec + pe->size;
if (part_limit < pe->lowsec) part_limit= limit;
if (part_limit > limit) part_limit= limit;
if (pe->lowsec < base) pe->lowsec= base;
if (part_limit < pe->lowsec) part_limit= pe->lowsec;
pe->size= part_limit - pe->lowsec;
}
entry.base= pe->lowsec * SECTOR_SIZE;
entry.size= pe->size * SECTOR_SIZE;
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if (diocntl(makedev(hd_major, device), DSETP, &entry) < 0)
fatal(dev_file);
show_part(finddev(makedev(hd_major, device)),
pe->lowsec, pe->size);
}
exit(0);
}