NetBSD-5.0.2/sbin/edlabel/edlabel.c
/* $NetBSD: edlabel.c,v 1.16 2006/10/23 03:56:38 mrg Exp $ */
/*
* Copyright (c) 1995 Gordon W. Ross
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gordon W. Ross
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#define FSTYPENAMES
#include <sys/disklabel.h>
#include <fcntl.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <util.h>
#include <stdlib.h>
/*
* Machine dependent constants you want to retrieve only once...
*/
int rawpartition, maxpartitions;
/*
* This is a data-driven program
*/
struct field {
const char *f_name;
int f_offset;
int f_type; /* 1:char, 2:short, 4:int, >4:string */
};
/* Table describing fields in the head of a disklabel. */
#define dloff(f) (int)(&((struct disklabel *)0)->f)
struct field label_head[] = {
{ " type_num", dloff(d_type), 2 },
{ " sub_type", dloff(d_subtype), 2 },
{ " type_name", dloff(d_typename), 16 },
{ " pack_name", dloff(d_packname), 16 },
{ " bytes/sector", dloff(d_secsize), 4 },
{ " sectors/track", dloff(d_nsectors), 4 },
{ " tracks/cylinder", dloff(d_ntracks), 4 },
{ " cylinders", dloff(d_ncylinders), 4 },
{ "sectors/cylinder", dloff(d_secpercyl), 4 },
/* Don't care about the others until later... */
{ .f_name = NULL },
};
#undef dloff
void check_divisors(struct disklabel *);
u_short dkcksum(struct disklabel *);
void edit_geo(struct disklabel *);
void edit_head_all(struct disklabel *, int);
void edit_head_field(void *, struct field *, int);
void edit_partition(struct disklabel *, int, int);
void get_fstype(char *, u_int8_t *);
void get_val_cts(struct disklabel *, char *, u_int32_t *);
void label_modify(struct disklabel *, char *);
void label_print(struct disklabel *, char *);
void label_quit(struct disklabel *, char *);
void label_read(struct disklabel *, char *);
void label_write(struct disklabel *, char *);
void menu(void);
void print_val_cts(struct disklabel *, u_long val);
char tmpbuf[64];
void
edit_head_field(void *v, struct field *f, int modify /* also modify */)
{
u_int8_t *cp;
u_int tmp;
cp = v;
cp += f->f_offset;
printf("%s: ", f->f_name);
/* Print current value... */
switch (f->f_type) {
case 1:
tmp = *cp;
printf("%d", tmp);
break;
case 2:
tmp = *((u_int16_t *)cp);
printf("%d", tmp);
break;
case 4:
tmp = *((u_int32_t *)cp);
printf("%d", tmp);
break;
default:
/* must be a string. */
strlcpy(tmpbuf, (char*)cp, sizeof(tmpbuf));
printf("%s", tmpbuf);
break;
}
if (modify == 0) {
printf("\n");
return;
}
printf(" ? ");
fflush(stdout);
tmpbuf[0] = '\0';
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
if ((tmpbuf[0] == '\0') || (tmpbuf[0] == '\n')) {
/* no new value supplied. */
return;
}
/* store new value */
if (f->f_type <= 4)
if (sscanf(tmpbuf, "%d", &tmp) != 1)
return;
switch (f->f_type) {
case 1:
*cp = tmp;
break;
case 2:
*((u_int16_t *)cp) = tmp;
break;
case 4:
*((u_int32_t *)cp) = tmp;
break;
default:
/* Get rid of the trailing newline. */
tmp = strlen(tmpbuf);
if (tmp < 1)
break;
if (tmpbuf[tmp-1] == '\n')
tmpbuf[tmp-1] = '\0';
strncpy((char*)cp, tmpbuf, f->f_type);
break;
}
}
void
edit_head_all(struct disklabel *d, int modify)
{
struct field *f;
/* Edit head stuff. */
for (f = label_head; f->f_name; f++)
edit_head_field(d, f, modify);
}
void
edit_geo(struct disklabel *d)
{
int nsect, ntrack, ncyl, spc;
nsect = ntrack = ncyl = spc = 0;
printf("Sectors/track: ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
if (sscanf(tmpbuf, "%d", &nsect) != 1)
nsect = d->d_nsectors;
printf("Track/cyl: ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
if (sscanf(tmpbuf, "%d", &ntrack) != 1)
ntrack = d->d_ntracks;
if (!nsect || !ntrack)
return;
spc = nsect * ntrack;
if (!(ncyl = d->d_secperunit / spc))
return;
d->d_nsectors = nsect;
d->d_ntracks = ntrack;
d->d_ncylinders = ncyl;
d->d_secpercyl = spc;
}
void
print_val_cts(struct disklabel *d, u_long val)
{
int sects, trks, cyls;
char marker;
char buf[80];
marker = (val % d->d_secpercyl) ? '*' : ' ';
sects = val % d->d_nsectors;
cyls = val / d->d_nsectors;
trks = cyls % d->d_ntracks;
cyls /= d->d_ntracks;
snprintf(buf, sizeof(buf), "(%d/%02d/%02d)%c", cyls, trks, sects,
marker);
printf(" %9ld %16s", val, buf);
}
void
get_val_cts(struct disklabel *d, char *buf, u_int32_t *result)
{
u_long tmp;
int cyls, trks, sects;
tmp = sscanf(buf, "%d/%d/%d", &cyls, &trks, §s);
if (tmp == 1)
*result = cyls; /* really nblks! */
if (tmp == 3) {
tmp = cyls;
tmp *= d->d_ntracks;
tmp += trks;
tmp *= d->d_nsectors;
tmp += sects;
*result = tmp;
}
}
void
get_fstype(char *buf, u_int8_t *fstype)
{
int i, len;
/* An empty response retains previous value */
if (buf[0] == '\n')
return;
for (i = 0, len = strlen(buf) - 1; i < FSMAXTYPES; i++) {
if (!strncasecmp(buf, fstypenames[i], len)) {
*fstype = i;
return;
}
}
}
void
edit_partition(struct disklabel *d, int idx, int modify)
{
struct partition *p;
char letter;
const char *comment;
if ((idx < 0) || (idx >= maxpartitions)) {
printf("bad partition index\n");
return;
}
p = &d->d_partitions[idx];
letter = 'a' + idx;
/* Set hint about partition type */
if (idx == rawpartition)
comment = "disk";
else {
comment = "user";
switch(idx) {
case 0:
comment = "root";
break;
case 1:
comment = "swap";
break;
}
}
/* Print current value... */
printf(" %c (%s) ", letter, comment);
print_val_cts(d, p->p_offset);
print_val_cts(d, p->p_size);
printf(" %s\n", fstypenames[p->p_fstype]);
if (modify == 0)
return;
/* starting block, or cyls/trks/sects */
printf("start as <blkno> or <cyls/trks/sects> : ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
get_val_cts(d, tmpbuf, &p->p_offset);
/* number of blocks, or cyls/trks/sects */
printf("length as <nblks> or <cyls/trks/sects> : ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
get_val_cts(d, tmpbuf, &p->p_size);
/* partition type */
printf("type: ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
get_fstype(tmpbuf, &p->p_fstype);
}
/*****************************************************************/
void
check_divisors(struct disklabel *d)
{
if (d->d_nsectors == 0) {
d->d_nsectors = 1;
printf("bad sect/trk, set to 1\n");
}
if (d->d_ntracks == 0) {
d->d_ntracks = 1;
printf("bad trks/cyl, set to 1\n");
}
if (d->d_ncylinders == 0) {
d->d_ncylinders = 1;
printf("bad cyls, set to 1\n");
}
if (d->d_secpercyl == 0) {
d->d_secpercyl = (d->d_nsectors * d->d_ntracks);
printf("bad sect/cyl, set to %d\n", d->d_secpercyl);
}
}
u_short
dkcksum(struct disklabel *d)
{
u_short *start, *end;
u_short sum = 0;
start = (u_short *)d;
end = (u_short *)&d->d_partitions[d->d_npartitions];
while (start < end)
sum ^= *start++;
return (sum);
}
void
label_write(struct disklabel *d, char *dn)
{
int fd;
d->d_magic = DISKMAGIC;
d->d_magic2 = DISKMAGIC;
d->d_checksum = 0;
d->d_checksum = dkcksum(d);
fd = open(dn, O_RDWR, 0);
if (fd < 0) {
perror(dn);
return;
}
if (ioctl(fd, DIOCWDINFO, d) < 0) {
perror("ioctl DIOCWDINFO");
}
close(fd);
}
void
label_read(struct disklabel *dl, char *dn)
{
int fd;
fd = open(dn, O_RDONLY, 0);
if (fd < 0) {
perror(dn);
exit(1);
}
if (ioctl(fd, DIOCGDINFO, dl) < 0) {
if (errno == ESRCH)
fprintf(stderr, "edlabel: No disk label on disk\n");
else
perror("ioctl DIOCGDINFO");
exit(1);
}
/* Make sure divisors are non-zero. */
check_divisors(dl);
close(fd);
}
/*****************************************************************/
void
label_print(struct disklabel *dl, char *dn)
{
int i;
/* Print out head stuff. */
edit_head_all(dl, 0);
/* And the partition header. */
printf("partition%6sstart%9s(c/t/s)%6snblks%9s(c/t/s) type\n\n"
"", "", "", "", "");
for (i = 0; i < dl->d_npartitions; i++)
edit_partition(dl, i, 0);
}
char modify_cmds[] = "modify subcommands:\n\
@ : modify disk parameters\n\
a-%c : modify partition\n%s\
q : quit this subcommand\n";
void
label_modify(struct disklabel *dl, char *dn)
{
int c, i;
int scsi_fict = 0;
if (!strcmp(dl->d_typename, "SCSI disk")
&& !strcmp(dl->d_packname, "fictitious"))
scsi_fict = 1;
printf(modify_cmds, 'a' + maxpartitions - 1,
scsi_fict ? " s : standardize geometry\n" : "");
for (;;) {
printf("edlabel/modify> ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
break;
c = tmpbuf[0];
if ((c == '\0') || (c == '\n'))
continue; /* blank line */
if (c == 'q')
break;
if (c == '@') {
edit_head_all(dl, 1);
check_divisors(dl);
continue;
}
if ((c == 's') && scsi_fict) {
edit_geo(dl);
continue;
}
if ((c < 'a') || (c > 'q')) {
printf("bad input. ");
printf(modify_cmds, 'a' + maxpartitions - 1,
scsi_fict ? " s : standardize geometry\n" : "");
continue;
}
edit_partition(dl, c - 'a', 1);
}
/* Set the d_npartitions field correctly */
for (i = 0; i < maxpartitions; i++) {
if (dl->d_partitions[i].p_size)
dl->d_npartitions = i + 1;
}
}
void
label_quit(struct disklabel *dl, char *dn)
{
exit(0);
}
struct cmd {
void (*cmd_func)(struct disklabel *, char *);
const char *cmd_name;
const char *cmd_descr;
} cmds[] = {
{ label_print, "print", "display the current disk label" },
{ label_modify, "modify", "prompt for changes to the label" },
{ label_write, "write", "write the new label to disk" },
{ label_quit, "quit", "terminate program" },
{ .cmd_func = 0 },
};
void
menu(void)
{
struct cmd *cmd;
printf("edlabel menu:\n");
for (cmd = cmds; cmd->cmd_func; cmd++)
printf("%s\t- %s\n", cmd->cmd_name, cmd->cmd_descr);
}
int
main(int argc, char **argv)
{
struct disklabel dl;
struct cmd *cmd;
char *dev_name;
if (argc != 2) {
fprintf(stderr, "usage: edlabel RAWDISK\n");
exit(1);
}
dev_name = argv[1];
rawpartition = getrawpartition();
maxpartitions = getmaxpartitions();
label_read(&dl, dev_name);
menu();
for (;;) {
printf("edlabel> ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
break;
for (cmd = cmds; cmd->cmd_func; cmd++)
if (cmd->cmd_name[0] == tmpbuf[0])
goto found;
printf("Invalid command. ");
menu();
continue;
found:
cmd->cmd_func(&dl, dev_name);
}
exit(0);
}