4.3BSD/usr/src/etc/diskpart.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)diskpart.c 5.5 (Berkeley) 5/30/86";
#endif not lint
/*
* Program to calculate standard disk partition sizes.
*/
#include <sys/param.h>
#include <stdio.h>
#include <disktab.h>
#define NPARTITIONS 8
#define PART(x) (x - 'a')
/*
* Default partition sizes, where they exist.
*/
#define NDEFAULTS 4
int defpart[NDEFAULTS][NPARTITIONS] = {
{ 15884, 66880, 0, 15884, 307200, 0, 0, 291346 }, /* ~ 356+ Mbytes */
{ 15884, 33440, 0, 15884, 55936, 0, 0, 291346 }, /* ~ 206-355 Mbytes */
{ 15884, 33440, 0, 15884, 55936, 0, 0, 0 }, /* ~ 61-205 Mbytes */
{ 15884, 10032, 0, 15884, 0, 0, 0, 0 }, /* ~ 20-60 Mbytes */
};
/*
* Each array defines a layout for a disk;
* that is, the collection of partitions totally
* covers the physical space on a disk.
*/
#define NLAYOUTS 3
char layouts[NLAYOUTS][NPARTITIONS] = {
{ 'a', 'b', 'h', 'g' },
{ 'a', 'b', 'h', 'd', 'e', 'f' },
{ 'c' },
};
/*
* Default disk block and disk block fragment
* sizes for each file system. Those file systems
* with zero block and frag sizes are special cases
* (e.g. swap areas or for access to the entire device).
*/
struct defparam {
int p_bsize; /* block size */
int p_fsize; /* frag size */
} defparam[NPARTITIONS] = {
{ 8192, 1024 }, /* a */
{ 8192, 1024 }, /* b */
{ 8192, 1024 }, /* c */
{ 4096, 512 }, /* d */
{ 8192, 1024 }, /* e */
{ 8192, 1024 }, /* f */
{ 8192, 1024 }, /* g */
{ 8192, 1024 } /* h */
};
/*
* Each disk has some space reserved for a bad sector
* forwarding table. DEC standard 144 uses the first
* 5 even numbered sectors in the last track of the
* last cylinder for replicated storage of the bad sector
* table; another 126 sectors past this is needed as a
* pool of replacement sectors.
*/
int badsecttable = 126; /* # sectors */
int pflag; /* print device driver partition tables */
int dflag; /* print disktab entry */
struct disktab *promptfordisk();
main(argc, argv)
int argc;
char *argv[];
{
struct disktab *dp;
register int curcyl, spc, def, part, layout;
int threshhold, numcyls[NPARTITIONS], startcyl[NPARTITIONS];
char *lp;
argc--, argv++;
if (argc < 1) {
fprintf(stderr, "usage: disktab [ -p ] [ -d ] disk-type\n");
exit(1);
}
if (argc > 0 && strcmp(*argv, "-p") == 0) {
pflag++;
argc--, argv++;
}
if (argc > 0 && strcmp(*argv, "-d") == 0) {
dflag++;
argc--, argv++;
}
dp = getdiskbyname(*argv);
if (dp == NULL) {
if (isatty(0))
dp = promptfordisk(*argv);
if (dp == NULL) {
fprintf(stderr, "%s: unknown disk type\n", *argv);
exit(2);
}
}
spc = dp->d_nsectors * dp->d_ntracks;
/*
* Bad sector table contains one track for the replicated
* copies of the table and enough full tracks preceding
* the last track to hold the pool of free blocks to which
* bad sectors are mapped.
*/
badsecttable = dp->d_nsectors + roundup(badsecttable, dp->d_nsectors);
threshhold = howmany(spc, badsecttable);
if (dp->d_badsectforw == 0) {
badsecttable = 0;
threshhold = 0;
}
/*
* Figure out if disk is large enough for
* expanded swap area and 'd', 'e', and 'f'
* partitions. Otherwise, use smaller defaults
* based on RK07.
*/
for (def = 0; def < NDEFAULTS; def++) {
curcyl = 0;
for (part = PART('a'); part < NPARTITIONS; part++)
curcyl += howmany(defpart[def][part], spc);
if (curcyl < dp->d_ncylinders - threshhold)
break;
}
if (def >= NDEFAULTS) {
fprintf(stderr, "%s: disk too small, calculate by hand\n",
*argv);
exit(3);
}
/*
* Calculate number of cylinders allocated to each disk
* partition. We may waste a bit of space here, but it's
* in the interest of compatibility (for mixed disk systems).
*/
for (curcyl = 0, part = PART('a'); part < NPARTITIONS; part++) {
numcyls[part] = 0;
if (defpart[def][part] != 0) {
numcyls[part] = howmany(defpart[def][part], spc);
curcyl += numcyls[part];
}
}
numcyls[PART('f')] = dp->d_ncylinders - curcyl;
numcyls[PART('g')] =
numcyls[PART('d')] + numcyls[PART('e')] + numcyls[PART('f')];
numcyls[PART('c')] = dp->d_ncylinders;
defpart[def][PART('f')] = numcyls[PART('f')] * spc - badsecttable;
defpart[def][PART('g')] = numcyls[PART('g')] * spc - badsecttable;
defpart[def][PART('c')] = numcyls[PART('c')] * spc;
if (!pflag)
defpart[def][PART('c')] -= badsecttable;
/*
* Calculate starting cylinder number for each partition.
* Note the 'h' partition is physically located before the
* 'g' or 'd' partition. This is reflected in the layout
* arrays defined above.
*/
for (layout = 0; layout < NLAYOUTS; layout++) {
curcyl = 0;
for (lp = layouts[layout]; *lp != 0; lp++) {
startcyl[PART(*lp)] = curcyl;
curcyl += numcyls[PART(*lp)];
}
}
if (pflag) {
printf("}, %s_sizes[%d] = {\n", dp->d_name, NPARTITIONS);
for (part = PART('a'); part < NPARTITIONS; part++) {
if (numcyls[part] == 0) {
printf("\t0,\t0,\n");
continue;
}
if (dp->d_sectoffset == 0) {
printf("\t%d,\t%d,\t\t/* %c=cyl %d thru %d */\n",
defpart[def][part], startcyl[part],
'A' + part, startcyl[part],
startcyl[part] + numcyls[part] - 1);
continue;
}
printf("\t%d,\t%d,\t\t/* %c=sectors %d thru %d */\n",
defpart[def][part], spc * startcyl[part],
'A' + part, spc * startcyl[part],
spc * startcyl[part] + defpart[def][part] - 1);
}
exit(0);
}
if (dflag) {
int nparts;
/*
* In case the disk is in the ``in-between'' range
* where the 'g' partition is smaller than the 'h'
* partition, reverse the frag sizes so the /usr partition
* is always set up with a frag size larger than the
* user's partition.
*/
if (defpart[def][PART('g')] < defpart[def][PART('h')]) {
int temp;
temp = defparam[PART('h')].p_fsize;
defparam[PART('h')].p_fsize =
defparam[PART('g')].p_fsize;
defparam[PART('g')].p_fsize = temp;
}
printf("%s:\\\n", dp->d_name);
printf("\t:ty=%s:ns#%d:nt#%d:nc#%d:%s%s\\\n", dp->d_type,
dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders,
dp->d_badsectforw ? "sf:" : "",
dp->d_sectoffset ? "so:" : "");
for (nparts = 0, part = PART('a'); part < NPARTITIONS; part++)
if (defpart[def][part] != 0)
nparts++;
for (part = PART('a'); part < NPARTITIONS; part++) {
if (defpart[def][part] == 0)
continue;
printf("\t:p%c#%d:", 'a' + part, defpart[def][part]);
if (defparam[part].p_bsize != 0) {
printf("b%c#%d:f%c#%d:",
'a' + part, defparam[part].p_bsize,
'a' + part, defparam[part].p_fsize);
}
nparts--;
printf("%s\n", nparts > 0 ? "\\" : "");
}
exit(0);
}
printf("%s: #sectors/track=%d, #tracks/cylinder=%d #cylinders=%d\n",
dp->d_name, dp->d_nsectors, dp->d_ntracks, dp->d_ncylinders);
printf("\n Partition\t Size\t Range\n");
for (part = PART('a'); part < NPARTITIONS; part++) {
printf("\t%c\t", 'a' + part);
if (numcyls[part] == 0) {
printf(" unused\n");
continue;
}
printf("%7d\t%4d - %d\n", defpart[def][part], startcyl[part],
startcyl[part] + numcyls[part] - 1);
}
}
struct disktab disk;
struct field {
char *f_name;
char *f_defaults;
int *f_location;
} fields[] = {
{ "sector size", "512", &disk.d_secsize },
{ "#sectors/track", 0, &disk.d_nsectors },
{ "#tracks/cylinder", 0, &disk.d_ntracks },
{ "#cylinders", 0, &disk.d_ncylinders },
{ "revolutions/minute", "3600", &disk.d_rpm },
{ 0, 0, 0 },
};
struct disktab *
promptfordisk(name)
char *name;
{
register struct disktab *dp = &disk;
register struct field *fp;
static char type[BUFSIZ];
char buf[BUFSIZ], *cp, *gets();
dp->d_name = name;
fprintf(stderr,
"%s: unknown disk type, want to supply parameters (y/n)? ",
name);
(void) gets(buf);
if (*buf != 'y')
return ((struct disktab *)0);
gettype:
fprintf(stderr, "type (winchester|removable|simulated)? ");
(void) gets(type);
if (strcmp(type, "winchester") && strcmp(type, "removable") &&
strcmp(type, "simulated")) {
fprintf(stderr, "%s: bad disk type\n", type);
goto gettype;
}
dp->d_type = type;
fprintf(stderr, "(type <cr> to get default value, if only one)\n");
fprintf(stderr, "Do %ss require sector or cylinder offsets (%s)? ",
dp->d_name, "cylinder");
(void) gets(buf);
if (*buf == 's')
dp->d_sectoffset = 1;
else
dp->d_sectoffset = 0;
fprintf(stderr, "Do %ss support bad144 bad block forwarding (yes)? ",
dp->d_name);
(void) gets(buf);
if (*buf != 'n')
dp->d_badsectforw = 1;
else
dp->d_badsectforw = 0;
for (fp = fields; fp->f_name != NULL; fp++) {
again:
fprintf(stderr, "%s ", fp->f_name);
if (fp->f_defaults != NULL)
fprintf(stderr, "(%s)", fp->f_defaults);
fprintf(stderr, "? ");
cp = gets(buf);
if (*cp == '\0') {
if (fp->f_defaults == NULL) {
fprintf(stderr, "no default value\n");
goto again;
}
cp = fp->f_defaults;
}
*fp->f_location = atoi(cp);
if (*fp->f_location == 0) {
fprintf(stderr, "%s: bad value\n", cp);
goto again;
}
}
return (dp);
}