bsdlabel.c revision 183496 
1/*
2 * Copyright (c) 1994, 1995 Gordon W. Ross
3 * Copyright (c) 1994 Theo de Raadt
4 * All rights reserved.
5 * Copyright (c) 1987, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Symmetric Computer Systems.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 *      This product includes software developed by Theo de Raadt.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 *	from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
41 */
42
43#if 0
44#ifndef lint
45static const char copyright[] =
46"@(#) Copyright (c) 1987, 1993\n\
47	The Regents of the University of California.  All rights reserved.\n";
48#endif /* not lint */
49
50#ifndef lint
51static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 1/7/94";
52/* from static char sccsid[] = "@(#)disklabel.c	1.2 (Symmetric) 11/28/85"; */
53#endif /* not lint */
54#endif
55#include <sys/cdefs.h>
56__FBSDID("$FreeBSD: head/sbin/bsdlabel/bsdlabel.c 183496 2008-09-30 11:46:14Z lulf $");
57
58#include <sys/param.h>
59#include <stdint.h>
60#include <sys/file.h>
61#include <sys/stat.h>
62#include <sys/wait.h>
63#include <sys/disk.h>
64#define DKTYPENAMES
65#define FSTYPENAMES
66#define MAXPARTITIONS	26
67#include <sys/disklabel.h>
68
69#include <unistd.h>
70#include <string.h>
71#include <stdio.h>
72#include <libgeom.h>
73#include <stdlib.h>
74#include <signal.h>
75#include <stdarg.h>
76#include <ctype.h>
77#include <err.h>
78#include <errno.h>
79
80#include "pathnames.h"
81
82static void	makelabel(const char *, struct disklabel *);
83static int	writelabel(void);
84static int	readlabel(int flag);
85static void	display(FILE *, const struct disklabel *);
86static int	edit(void);
87static int	editit(void);
88static void	fixlabel(struct disklabel *);
89static char	*skip(char *);
90static char	*word(char *);
91static int	getasciilabel(FILE *, struct disklabel *);
92static int	getasciipartspec(char *, struct disklabel *, int, int);
93static int	checklabel(struct disklabel *);
94static void	usage(void);
95static struct disklabel *getvirginlabel(void);
96
97#define	DEFEDITOR	_PATH_VI
98#define	DEFPARTITIONS	8
99
100static char	*specname;
101static char	*pname;
102static char	tmpfil[] = PATH_TMPFILE;
103
104static struct	disklabel lab;
105static u_char	bootarea[BBSIZE];
106static off_t	mediasize;
107static u_int	secsize;
108static char	blank[] = "";
109static char	unknown[] = "unknown";
110
111#define MAX_PART ('z')
112#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
113static char    part_size_type[MAX_NUM_PARTS];
114static char    part_offset_type[MAX_NUM_PARTS];
115static int     part_set[MAX_NUM_PARTS];
116
117static int	installboot;	/* non-zero if we should install a boot program */
118static int	allfields;	/* present all fields in edit */
119static char const *xxboot;	/* primary boot */
120
121static off_t mbroffset;
122#ifndef LABELSECTOR
123#define LABELSECTOR -1
124#endif
125#ifndef LABELOFFSET
126#define LABELOFFSET -1
127#endif
128static int labelsoffset = LABELSECTOR;
129static int labeloffset = LABELOFFSET;
130static int bbsize = BBSIZE;
131static int alphacksum =
132#if defined(__alpha__)
133	1;
134#else
135	0;
136#endif
137
138enum	{
139	UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
140} op = UNSPEC;
141
142
143static int	disable_write;   /* set to disable writing to disk label */
144static int	is_file;	/* work on a file (abs. pathname), "-f" opt. */
145
146int
147main(int argc, char *argv[])
148{
149	FILE *t;
150	int ch, error, fd;
151	const char *name;
152
153	error = 0;
154	name = NULL;
155
156	while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
157		switch (ch) {
158			case 'A':
159				allfields = 1;
160				break;
161			case 'B':
162				++installboot;
163				break;
164			case 'b':
165				xxboot = optarg;
166				break;
167			case 'f':
168				is_file=1;
169				break;
170			case 'm':
171				if (!strcmp(optarg, "i386") ||
172				    !strcmp(optarg, "amd64") ||
173				    !strcmp(optarg, "ia64") ||
174				    !strcmp(optarg, "pc98")) {
175					labelsoffset = 1;
176					labeloffset = 0;
177					bbsize = 8192;
178					alphacksum = 0;
179				} else if (!strcmp(optarg, "alpha")) {
180					labelsoffset = 0;
181					labeloffset = 64;
182					bbsize = 8192;
183					alphacksum = 1;
184				} else {
185					errx(1, "Unsupported architecture");
186				}
187				break;
188			case 'n':
189				disable_write = 1;
190				break;
191			case 'R':
192				if (op != UNSPEC)
193					usage();
194				op = RESTORE;
195				break;
196			case 'e':
197				if (op != UNSPEC)
198					usage();
199				op = EDIT;
200				break;
201			case 'r':
202				/*
203				 * We accept and ignode -r for compatibility with
204				 * historically disklabel usage.
205				 */
206				break;
207			case 'w':
208				if (op != UNSPEC)
209					usage();
210				op = WRITE;
211				break;
212			case '?':
213			default:
214				usage();
215		}
216	argc -= optind;
217	argv += optind;
218
219	if (argc < 1)
220		usage();
221	if (labelsoffset < 0 || labeloffset < 0)
222		errx(1, "a -m <architecture> option must be specified");
223
224	/* Figure out the names of the thing we're working on */
225	if (is_file) {
226		specname = argv[0];
227	} else {
228		specname = g_device_path(argv[0]);
229		if (specname == NULL) {
230			warn("unable to get correct path for %s", argv[0]);
231			return(1);
232		}
233		fd = open(specname, O_RDONLY);
234		if (fd < 0) {
235			warn("error opening %s", specname);
236			return(1);
237		}
238		pname = g_providername(fd);
239		if (pname == NULL) {
240			warn("error getting providername for %s", specname);
241			close(fd);
242			return(1);
243		}
244		close(fd);
245	}
246
247	if (installboot && op == UNSPEC)
248		op = WRITEBOOT;
249	else if (op == UNSPEC)
250		op = READ;
251
252	switch(op) {
253
254	case UNSPEC:
255		break;
256
257	case EDIT:
258		if (argc != 1)
259			usage();
260		readlabel(1);
261		fixlabel(&lab);
262		error = edit();
263		break;
264
265	case READ:
266		if (argc != 1)
267			usage();
268		readlabel(1);
269		display(stdout, NULL);
270		error = checklabel(NULL);
271		break;
272
273	case RESTORE:
274		if (argc != 2)
275			usage();
276		if (!(t = fopen(argv[1], "r")))
277			err(4, "fopen %s", argv[1]);
278		readlabel(0);
279		if (!getasciilabel(t, &lab))
280			exit(1);
281		error = writelabel();
282		break;
283
284	case WRITE:
285		if (argc == 2)
286			name = argv[1];
287		else if (argc == 1)
288			name = "auto";
289		else
290			usage();
291		readlabel(0);
292		makelabel(name, &lab);
293		fixlabel(&lab);
294		if (checklabel(NULL) == 0)
295			error = writelabel();
296		break;
297
298	case WRITEBOOT:
299
300		readlabel(1);
301		fixlabel(&lab);
302		if (argc == 2)
303			makelabel(argv[1], &lab);
304		if (checklabel(NULL) == 0)
305			error = writelabel();
306		break;
307	}
308	exit(error);
309}
310
311static void
312fixlabel(struct disklabel *lp)
313{
314	struct partition *dp;
315	int i;
316
317	for (i = 0; i < lp->d_npartitions; i++) {
318		if (i == RAW_PART)
319			continue;
320		if (lp->d_partitions[i].p_size)
321			return;
322	}
323
324	dp = &lp->d_partitions[0];
325	dp->p_offset = BBSIZE / secsize;
326	dp->p_size = lp->d_secperunit - dp->p_offset;
327}
328
329/*
330 * Construct a prototype disklabel from /etc/disktab.
331 */
332static void
333makelabel(const char *type, struct disklabel *lp)
334{
335	struct disklabel *dp;
336
337	if (strcmp(type, "auto") == 0)
338		dp = getvirginlabel();
339	else
340		dp = getdiskbyname(type);
341	if (dp == NULL)
342		errx(1, "%s: unknown disk type", type);
343	*lp = *dp;
344	bzero(lp->d_packname, sizeof(lp->d_packname));
345}
346
347static void
348readboot(void)
349{
350	int fd, i;
351	struct stat st;
352	uint64_t *p;
353
354	if (xxboot == NULL)
355		xxboot = "/boot/boot";
356	fd = open(xxboot, O_RDONLY);
357	if (fd < 0)
358		err(1, "cannot open %s", xxboot);
359	fstat(fd, &st);
360	if (alphacksum && st.st_size <= BBSIZE - 512) {
361		i = read(fd, bootarea + 512, st.st_size);
362		if (i != st.st_size)
363			err(1, "read error %s", xxboot);
364
365		/*
366		 * Set the location and length so SRM can find the
367		 * boot blocks.
368		 */
369		p = (uint64_t *)bootarea;
370		p[60] = (st.st_size + secsize - 1) / secsize;
371		p[61] = 1;
372		p[62] = 0;
373		return;
374	} else if ((!alphacksum) && st.st_size <= BBSIZE) {
375		i = read(fd, bootarea, st.st_size);
376		if (i != st.st_size)
377			err(1, "read error %s", xxboot);
378		return;
379	}
380	errx(1, "boot code %s is wrong size", xxboot);
381}
382
383static int
384writelabel(void)
385{
386	uint64_t *p, sum;
387	int i, fd;
388	struct gctl_req *grq;
389	char const *errstr;
390	struct disklabel *lp = &lab;
391
392	if (disable_write) {
393		warnx("write to disk label supressed - label was as follows:");
394		display(stdout, NULL);
395		return (0);
396	}
397
398	lp->d_magic = DISKMAGIC;
399	lp->d_magic2 = DISKMAGIC;
400	lp->d_checksum = 0;
401	lp->d_checksum = dkcksum(lp);
402	if (installboot)
403		readboot();
404	for (i = 0; i < lab.d_npartitions; i++)
405		if (lab.d_partitions[i].p_size)
406			lab.d_partitions[i].p_offset += mbroffset;
407	bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
408	    lp);
409	if (alphacksum) {
410		/* Generate the bootblock checksum for the SRM console.  */
411		for (p = (uint64_t *)bootarea, i = 0, sum = 0; i < 63; i++)
412			sum += p[i];
413		p[63] = sum;
414	}
415
416	fd = open(specname, O_RDWR);
417	if (fd < 0) {
418		if (is_file) {
419			warn("cannot open file %s for writing label", specname);
420			return(1);
421		}
422
423		grq = gctl_get_handle();
424		gctl_ro_param(grq, "verb", -1, "write label");
425		gctl_ro_param(grq, "class", -1, "BSD");
426		gctl_ro_param(grq, "geom", -1, pname);
427		gctl_ro_param(grq, "label", 148+16*8,
428			bootarea + labeloffset + labelsoffset * secsize);
429		errstr = gctl_issue(grq);
430		if (errstr != NULL) {
431			warnx("%s", errstr);
432			gctl_free(grq);
433			return(1);
434		}
435		gctl_free(grq);
436		if (installboot) {
437			grq = gctl_get_handle();
438			gctl_ro_param(grq, "verb", -1, "write bootcode");
439			gctl_ro_param(grq, "class", -1, "BSD");
440			gctl_ro_param(grq, "geom", -1, pname);
441			gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
442			errstr = gctl_issue(grq);
443			if (errstr != NULL) {
444				warnx("%s", errstr);
445				gctl_free(grq);
446				return (1);
447			}
448			gctl_free(grq);
449		}
450	} else {
451		if (write(fd, bootarea, bbsize) != bbsize) {
452			warn("write %s", specname);
453			close (fd);
454			return (1);
455		}
456		close (fd);
457	}
458	return (0);
459}
460
461static void
462get_file_parms(int f)
463{
464	int i;
465	struct stat sb;
466
467	if (fstat(f, &sb) != 0)
468		err(4, "fstat failed");
469	i = sb.st_mode & S_IFMT;
470	if (i != S_IFREG && i != S_IFLNK)
471		errx(4, "%s is not a valid file or link", specname);
472	secsize = DEV_BSIZE;
473	mediasize = sb.st_size;
474}
475
476/*
477 * Fetch disklabel for disk.
478 */
479static int
480readlabel(int flag)
481{
482	int f, i;
483	int error;
484	struct gctl_req *grq;
485	char const *errstr;
486
487	f = open(specname, O_RDONLY);
488	if (f < 0)
489		err(1, specname);
490	if (is_file)
491		get_file_parms(f);
492	else {
493		mediasize = g_mediasize(f);
494		secsize = g_sectorsize(f);
495		if (secsize < 0 || mediasize < 0)
496			err(4, "cannot get disk geometry");
497	}
498	if (mediasize > (off_t)0xffffffff * secsize)
499		errx(1,
500		    "disks with more than 2^32-1 sectors are not supported");
501	(void)lseek(f, (off_t)0, SEEK_SET);
502	if (read(f, bootarea, BBSIZE) != BBSIZE)
503		err(4, "%s read", specname);
504	close (f);
505	error = bsd_disklabel_le_dec(
506	    bootarea + (labeloffset + labelsoffset * secsize),
507	    &lab, MAXPARTITIONS);
508	if (flag && error)
509		errx(1, "%s: no valid label found", specname);
510
511	if (is_file)
512		return(0);
513	grq = gctl_get_handle();
514	gctl_ro_param(grq, "verb", -1, "read mbroffset");
515	gctl_ro_param(grq, "class", -1, "BSD");
516	gctl_ro_param(grq, "geom", -1, pname);
517	gctl_rw_param(grq, "mbroffset", sizeof(mbroffset), &mbroffset);
518	errstr = gctl_issue(grq);
519	if (errstr != NULL) {
520		mbroffset = 0;
521		gctl_free(grq);
522		return (error);
523	}
524	mbroffset /= lab.d_secsize;
525	if (lab.d_partitions[RAW_PART].p_offset == mbroffset)
526		for (i = 0; i < lab.d_npartitions; i++)
527			if (lab.d_partitions[i].p_size)
528				lab.d_partitions[i].p_offset -= mbroffset;
529	return (error);
530}
531
532
533static void
534display(FILE *f, const struct disklabel *lp)
535{
536	int i, j;
537	const struct partition *pp;
538
539	if (lp == NULL)
540		lp = &lab;
541
542	fprintf(f, "# %s:\n", specname);
543	if (allfields) {
544		if (lp->d_type < DKMAXTYPES)
545			fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
546		else
547			fprintf(f, "type: %u\n", lp->d_type);
548		fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
549			lp->d_typename);
550		fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
551			lp->d_packname);
552		fprintf(f, "flags:");
553		if (lp->d_flags & D_REMOVABLE)
554			fprintf(f, " removeable");
555		if (lp->d_flags & D_ECC)
556			fprintf(f, " ecc");
557		if (lp->d_flags & D_BADSECT)
558			fprintf(f, " badsect");
559		fprintf(f, "\n");
560		fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
561		fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
562		fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
563		fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
564		fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
565		fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
566		fprintf(f, "rpm: %u\n", lp->d_rpm);
567		fprintf(f, "interleave: %u\n", lp->d_interleave);
568		fprintf(f, "trackskew: %u\n", lp->d_trackskew);
569		fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
570		fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
571		    (u_long)lp->d_headswitch);
572		fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
573		    (u_long)lp->d_trkseek);
574		fprintf(f, "drivedata: ");
575		for (i = NDDATA - 1; i >= 0; i--)
576			if (lp->d_drivedata[i])
577				break;
578		if (i < 0)
579			i = 0;
580		for (j = 0; j <= i; j++)
581			fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
582		fprintf(f, "\n\n");
583	}
584	fprintf(f, "%u partitions:\n", lp->d_npartitions);
585	fprintf(f,
586	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
587	pp = lp->d_partitions;
588	for (i = 0; i < lp->d_npartitions; i++, pp++) {
589		if (pp->p_size) {
590			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
591			   (u_long)pp->p_size, (u_long)pp->p_offset);
592			if (pp->p_fstype < FSMAXTYPES)
593				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
594			else
595				fprintf(f, "%8d", pp->p_fstype);
596			switch (pp->p_fstype) {
597
598			case FS_UNUSED:				/* XXX */
599				fprintf(f, "    %5lu %5lu %5.5s ",
600				    (u_long)pp->p_fsize,
601				    (u_long)(pp->p_fsize * pp->p_frag), "");
602				break;
603
604			case FS_BSDFFS:
605				fprintf(f, "    %5lu %5lu %5u ",
606				    (u_long)pp->p_fsize,
607				    (u_long)(pp->p_fsize * pp->p_frag),
608				    pp->p_cpg);
609				break;
610
611			case FS_BSDLFS:
612				fprintf(f, "    %5lu %5lu %5d",
613				    (u_long)pp->p_fsize,
614				    (u_long)(pp->p_fsize * pp->p_frag),
615				    pp->p_cpg);
616				break;
617
618			default:
619				fprintf(f, "%20.20s", "");
620				break;
621			}
622			if (i == RAW_PART) {
623				fprintf(f, "  # \"raw\" part, don't edit");
624			}
625			fprintf(f, "\n");
626		}
627	}
628	fflush(f);
629}
630
631static int
632edit(void)
633{
634	int c, fd;
635	struct disklabel label;
636	FILE *fp;
637
638	if ((fd = mkstemp(tmpfil)) == -1 ||
639	    (fp = fdopen(fd, "w")) == NULL) {
640		warnx("can't create %s", tmpfil);
641		return (1);
642	}
643	display(fp, NULL);
644	fclose(fp);
645	for (;;) {
646		if (!editit())
647			break;
648		fp = fopen(tmpfil, "r");
649		if (fp == NULL) {
650			warnx("can't reopen %s for reading", tmpfil);
651			break;
652		}
653		bzero((char *)&label, sizeof(label));
654		c = getasciilabel(fp, &label);
655		fclose(fp);
656		if (c) {
657			lab = label;
658			if (writelabel() == 0) {
659				(void) unlink(tmpfil);
660				return (0);
661			}
662		}
663		printf("re-edit the label? [y]: ");
664		fflush(stdout);
665		c = getchar();
666		if (c != EOF && c != (int)'\n')
667			while (getchar() != (int)'\n')
668				;
669		if  (c == (int)'n')
670			break;
671	}
672	(void) unlink(tmpfil);
673	return (1);
674}
675
676static int
677editit(void)
678{
679	int pid, xpid;
680	int locstat, omask;
681	const char *ed;
682
683	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
684	while ((pid = fork()) < 0) {
685		if (errno == EPROCLIM) {
686			warnx("you have too many processes");
687			return(0);
688		}
689		if (errno != EAGAIN) {
690			warn("fork");
691			return(0);
692		}
693		sleep(1);
694	}
695	if (pid == 0) {
696		sigsetmask(omask);
697		setgid(getgid());
698		setuid(getuid());
699		if ((ed = getenv("EDITOR")) == (char *)0)
700			ed = DEFEDITOR;
701		execlp(ed, ed, tmpfil, (char *)0);
702		err(1, "%s", ed);
703	}
704	while ((xpid = wait(&locstat)) >= 0)
705		if (xpid == pid)
706			break;
707	sigsetmask(omask);
708	return(!locstat);
709}
710
711static char *
712skip(char *cp)
713{
714
715	while (*cp != '\0' && isspace(*cp))
716		cp++;
717	if (*cp == '\0' || *cp == '#')
718		return (NULL);
719	return (cp);
720}
721
722static char *
723word(char *cp)
724{
725	char c;
726
727	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
728		cp++;
729	if ((c = *cp) != '\0') {
730		*cp++ = '\0';
731		if (c != '#')
732			return (skip(cp));
733	}
734	return (NULL);
735}
736
737/*
738 * Read an ascii label in from fd f,
739 * in the same format as that put out by display(),
740 * and fill in lp.
741 */
742static int
743getasciilabel(FILE *f, struct disklabel *lp)
744{
745	char *cp;
746	const char **cpp;
747	u_int part;
748	char *tp, line[BUFSIZ];
749	u_long v;
750	int lineno = 0, errors = 0;
751	int i;
752
753	makelabel("auto", lp);
754	bzero(&part_set, sizeof(part_set));
755	bzero(&part_size_type, sizeof(part_size_type));
756	bzero(&part_offset_type, sizeof(part_offset_type));
757	lp->d_bbsize = BBSIZE;				/* XXX */
758	lp->d_sbsize = 0;				/* XXX */
759	while (fgets(line, sizeof(line) - 1, f)) {
760		lineno++;
761		if ((cp = index(line,'\n')) != 0)
762			*cp = '\0';
763		cp = skip(line);
764		if (cp == NULL)
765			continue;
766		tp = index(cp, ':');
767		if (tp == NULL) {
768			fprintf(stderr, "line %d: syntax error\n", lineno);
769			errors++;
770			continue;
771		}
772		*tp++ = '\0', tp = skip(tp);
773		if (!strcmp(cp, "type")) {
774			if (tp == NULL)
775				tp = unknown;
776			cpp = dktypenames;
777			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
778				if (*cpp && !strcmp(*cpp, tp)) {
779					lp->d_type = cpp - dktypenames;
780					break;
781				}
782			if (cpp < &dktypenames[DKMAXTYPES])
783				continue;
784			v = strtoul(tp, NULL, 10);
785			if (v >= DKMAXTYPES)
786				fprintf(stderr, "line %d:%s %lu\n", lineno,
787				    "Warning, unknown disk type", v);
788			lp->d_type = v;
789			continue;
790		}
791		if (!strcmp(cp, "flags")) {
792			for (v = 0; (cp = tp) && *cp != '\0';) {
793				tp = word(cp);
794				if (!strcmp(cp, "removeable"))
795					v |= D_REMOVABLE;
796				else if (!strcmp(cp, "ecc"))
797					v |= D_ECC;
798				else if (!strcmp(cp, "badsect"))
799					v |= D_BADSECT;
800				else {
801					fprintf(stderr,
802					    "line %d: %s: bad flag\n",
803					    lineno, cp);
804					errors++;
805				}
806			}
807			lp->d_flags = v;
808			continue;
809		}
810		if (!strcmp(cp, "drivedata")) {
811			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
812				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
813				tp = word(cp);
814			}
815			continue;
816		}
817		if (sscanf(cp, "%lu partitions", &v) == 1) {
818			if (v == 0 || v > MAXPARTITIONS) {
819				fprintf(stderr,
820				    "line %d: bad # of partitions\n", lineno);
821				lp->d_npartitions = MAXPARTITIONS;
822				errors++;
823			} else
824				lp->d_npartitions = v;
825			continue;
826		}
827		if (tp == NULL)
828			tp = blank;
829		if (!strcmp(cp, "disk")) {
830			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
831			continue;
832		}
833		if (!strcmp(cp, "label")) {
834			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
835			continue;
836		}
837		if (!strcmp(cp, "bytes/sector")) {
838			v = strtoul(tp, NULL, 10);
839			if (v == 0 || (v % DEV_BSIZE) != 0) {
840				fprintf(stderr,
841				    "line %d: %s: bad sector size\n",
842				    lineno, tp);
843				errors++;
844			} else
845				lp->d_secsize = v;
846			continue;
847		}
848		if (!strcmp(cp, "sectors/track")) {
849			v = strtoul(tp, NULL, 10);
850#if (ULONG_MAX != 0xffffffffUL)
851			if (v == 0 || v > 0xffffffff)
852#else
853			if (v == 0)
854#endif
855			{
856				fprintf(stderr, "line %d: %s: bad %s\n",
857				    lineno, tp, cp);
858				errors++;
859			} else
860				lp->d_nsectors = v;
861			continue;
862		}
863		if (!strcmp(cp, "sectors/cylinder")) {
864			v = strtoul(tp, NULL, 10);
865			if (v == 0) {
866				fprintf(stderr, "line %d: %s: bad %s\n",
867				    lineno, tp, cp);
868				errors++;
869			} else
870				lp->d_secpercyl = v;
871			continue;
872		}
873		if (!strcmp(cp, "tracks/cylinder")) {
874			v = strtoul(tp, NULL, 10);
875			if (v == 0) {
876				fprintf(stderr, "line %d: %s: bad %s\n",
877				    lineno, tp, cp);
878				errors++;
879			} else
880				lp->d_ntracks = v;
881			continue;
882		}
883		if (!strcmp(cp, "cylinders")) {
884			v = strtoul(tp, NULL, 10);
885			if (v == 0) {
886				fprintf(stderr, "line %d: %s: bad %s\n",
887				    lineno, tp, cp);
888				errors++;
889			} else
890				lp->d_ncylinders = v;
891			continue;
892		}
893		if (!strcmp(cp, "sectors/unit")) {
894			v = strtoul(tp, NULL, 10);
895			if (v == 0) {
896				fprintf(stderr, "line %d: %s: bad %s\n",
897				    lineno, tp, cp);
898				errors++;
899			} else
900				lp->d_secperunit = v;
901			continue;
902		}
903		if (!strcmp(cp, "rpm")) {
904			v = strtoul(tp, NULL, 10);
905			if (v == 0 || v > USHRT_MAX) {
906				fprintf(stderr, "line %d: %s: bad %s\n",
907				    lineno, tp, cp);
908				errors++;
909			} else
910				lp->d_rpm = v;
911			continue;
912		}
913		if (!strcmp(cp, "interleave")) {
914			v = strtoul(tp, NULL, 10);
915			if (v == 0 || v > USHRT_MAX) {
916				fprintf(stderr, "line %d: %s: bad %s\n",
917				    lineno, tp, cp);
918				errors++;
919			} else
920				lp->d_interleave = v;
921			continue;
922		}
923		if (!strcmp(cp, "trackskew")) {
924			v = strtoul(tp, NULL, 10);
925			if (v > USHRT_MAX) {
926				fprintf(stderr, "line %d: %s: bad %s\n",
927				    lineno, tp, cp);
928				errors++;
929			} else
930				lp->d_trackskew = v;
931			continue;
932		}
933		if (!strcmp(cp, "cylinderskew")) {
934			v = strtoul(tp, NULL, 10);
935			if (v > USHRT_MAX) {
936				fprintf(stderr, "line %d: %s: bad %s\n",
937				    lineno, tp, cp);
938				errors++;
939			} else
940				lp->d_cylskew = v;
941			continue;
942		}
943		if (!strcmp(cp, "headswitch")) {
944			v = strtoul(tp, NULL, 10);
945			lp->d_headswitch = v;
946			continue;
947		}
948		if (!strcmp(cp, "track-to-track seek")) {
949			v = strtoul(tp, NULL, 10);
950			lp->d_trkseek = v;
951			continue;
952		}
953		/* the ':' was removed above */
954		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
955			fprintf(stderr,
956			    "line %d: %s: Unknown disklabel field\n", lineno,
957			    cp);
958			errors++;
959			continue;
960		}
961
962		/* Process a partition specification line. */
963		part = *cp - 'a';
964		if (part >= lp->d_npartitions) {
965			fprintf(stderr,
966			    "line %d: partition name out of range a-%c: %s\n",
967			    lineno, 'a' + lp->d_npartitions - 1, cp);
968			errors++;
969			continue;
970		}
971		part_set[part] = 1;
972
973		if (getasciipartspec(tp, lp, part, lineno) != 0) {
974			errors++;
975			break;
976		}
977	}
978	errors += checklabel(lp);
979	return (errors == 0);
980}
981
982#define NXTNUM(n) do { \
983	if (tp == NULL) { \
984		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
985		return (1); \
986	} else { \
987		cp = tp, tp = word(cp); \
988		(n) = strtoul(cp, NULL, 10); \
989	} \
990} while (0)
991
992/* retain 1 character following number */
993#define NXTWORD(w,n) do { \
994	if (tp == NULL) { \
995		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
996		return (1); \
997	} else { \
998		char *tmp; \
999		cp = tp, tp = word(cp); \
1000		(n) = strtoul(cp, &tmp, 10); \
1001		if (tmp) (w) = *tmp; \
1002	} \
1003} while (0)
1004
1005/*
1006 * Read a partition line into partition `part' in the specified disklabel.
1007 * Return 0 on success, 1 on failure.
1008 */
1009static int
1010getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1011{
1012	struct partition *pp;
1013	char *cp;
1014	const char **cpp;
1015	u_long v;
1016
1017	pp = &lp->d_partitions[part];
1018	cp = NULL;
1019
1020	v = 0;
1021	NXTWORD(part_size_type[part],v);
1022	if (v == 0 && part_size_type[part] != '*') {
1023		fprintf(stderr,
1024		    "line %d: %s: bad partition size\n", lineno, cp);
1025		return (1);
1026	}
1027	pp->p_size = v;
1028
1029	v = 0;
1030	NXTWORD(part_offset_type[part],v);
1031	if (v == 0 && part_offset_type[part] != '*' &&
1032	    part_offset_type[part] != '\0') {
1033		fprintf(stderr,
1034		    "line %d: %s: bad partition offset\n", lineno, cp);
1035		return (1);
1036	}
1037	pp->p_offset = v;
1038	if (tp == NULL) {
1039		fprintf(stderr, "line %d: missing file system type\n", lineno);
1040		return (1);
1041	}
1042	cp = tp, tp = word(cp);
1043	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1044		if (*cpp && !strcmp(*cpp, cp))
1045			break;
1046	if (*cpp != NULL) {
1047		pp->p_fstype = cpp - fstypenames;
1048	} else {
1049		if (isdigit(*cp))
1050			v = strtoul(cp, NULL, 10);
1051		else
1052			v = FSMAXTYPES;
1053		if (v >= FSMAXTYPES) {
1054			fprintf(stderr,
1055			    "line %d: Warning, unknown file system type %s\n",
1056			    lineno, cp);
1057			v = FS_UNUSED;
1058		}
1059		pp->p_fstype = v;
1060	}
1061
1062	switch (pp->p_fstype) {
1063	case FS_UNUSED:
1064	case FS_BSDFFS:
1065	case FS_BSDLFS:
1066		/* accept defaults for fsize/frag/cpg */
1067		if (tp) {
1068			NXTNUM(pp->p_fsize);
1069			if (pp->p_fsize == 0)
1070				break;
1071			NXTNUM(v);
1072			pp->p_frag = v / pp->p_fsize;
1073			if (tp != NULL)
1074				NXTNUM(pp->p_cpg);
1075		}
1076		/* else default to 0's */
1077		break;
1078	default:
1079		break;
1080	}
1081	return (0);
1082}
1083
1084/*
1085 * Check disklabel for errors and fill in
1086 * derived fields according to supplied values.
1087 */
1088static int
1089checklabel(struct disklabel *lp)
1090{
1091	struct partition *pp;
1092	int i, errors = 0;
1093	char part;
1094	u_long base_offset, needed, total_size, total_percent, current_offset;
1095	long free_space;
1096	int seen_default_offset;
1097	int hog_part;
1098	int j;
1099	struct partition *pp2;
1100
1101	if (lp == NULL)
1102		lp = &lab;
1103
1104	if (allfields) {
1105
1106		if (lp->d_secsize == 0) {
1107			fprintf(stderr, "sector size 0\n");
1108			return (1);
1109		}
1110		if (lp->d_nsectors == 0) {
1111			fprintf(stderr, "sectors/track 0\n");
1112			return (1);
1113		}
1114		if (lp->d_ntracks == 0) {
1115			fprintf(stderr, "tracks/cylinder 0\n");
1116			return (1);
1117		}
1118		if  (lp->d_ncylinders == 0) {
1119			fprintf(stderr, "cylinders/unit 0\n");
1120			errors++;
1121		}
1122		if (lp->d_rpm == 0)
1123			warnx("revolutions/minute 0");
1124		if (lp->d_secpercyl == 0)
1125			lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1126		if (lp->d_secperunit == 0)
1127			lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1128		if (lp->d_bbsize == 0) {
1129			fprintf(stderr, "boot block size 0\n");
1130			errors++;
1131		} else if (lp->d_bbsize % lp->d_secsize)
1132			warnx("boot block size %% sector-size != 0");
1133		if (lp->d_npartitions > MAXPARTITIONS)
1134			warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1135			    (u_long)lp->d_npartitions, MAXPARTITIONS);
1136	} else {
1137		struct disklabel *vl;
1138
1139		vl = getvirginlabel();
1140		lp->d_secsize = vl->d_secsize;
1141		lp->d_nsectors = vl->d_nsectors;
1142		lp->d_ntracks = vl->d_ntracks;
1143		lp->d_ncylinders = vl->d_ncylinders;
1144		lp->d_rpm = vl->d_rpm;
1145		lp->d_interleave = vl->d_interleave;
1146		lp->d_secpercyl = vl->d_secpercyl;
1147		lp->d_secperunit = vl->d_secperunit;
1148		lp->d_bbsize = vl->d_bbsize;
1149		lp->d_npartitions = vl->d_npartitions;
1150	}
1151
1152
1153	/* first allocate space to the partitions, then offsets */
1154	total_size = 0; /* in sectors */
1155	total_percent = 0; /* in percent */
1156	hog_part = -1;
1157	/* find all fixed partitions */
1158	for (i = 0; i < lp->d_npartitions; i++) {
1159		pp = &lp->d_partitions[i];
1160		if (part_set[i]) {
1161			if (part_size_type[i] == '*') {
1162				if (i == RAW_PART) {
1163					pp->p_size = lp->d_secperunit;
1164				} else {
1165					if (hog_part != -1)
1166						warnx("Too many '*' partitions (%c and %c)",
1167						    hog_part + 'a',i + 'a');
1168					else
1169						hog_part = i;
1170				}
1171			} else {
1172				off_t size;
1173
1174				size = pp->p_size;
1175				switch (part_size_type[i]) {
1176				case '%':
1177					total_percent += size;
1178					break;
1179				case 't':
1180				case 'T':
1181					size *= 1024ULL;
1182					/* FALLTHROUGH */
1183				case 'g':
1184				case 'G':
1185					size *= 1024ULL;
1186					/* FALLTHROUGH */
1187				case 'm':
1188				case 'M':
1189					size *= 1024ULL;
1190					/* FALLTHROUGH */
1191				case 'k':
1192				case 'K':
1193					size *= 1024ULL;
1194					break;
1195				case '\0':
1196					break;
1197				default:
1198					warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1199					    part_size_type[i], i + 'a');
1200					break;
1201				}
1202				/* don't count %'s yet */
1203				if (part_size_type[i] != '%') {
1204					/*
1205					 * for all not in sectors, convert to
1206					 * sectors
1207					 */
1208					if (part_size_type[i] != '\0') {
1209						if (size % lp->d_secsize != 0)
1210							warnx("partition %c not an integer number of sectors",
1211							    i + 'a');
1212						size /= lp->d_secsize;
1213						pp->p_size = size;
1214					}
1215					/* else already in sectors */
1216					if (i != RAW_PART)
1217						total_size += size;
1218				}
1219			}
1220		}
1221	}
1222
1223	/* Find out the total free space, excluding the boot block area. */
1224	base_offset = BBSIZE / secsize;
1225	free_space = 0;
1226	for (i = 0; i < lp->d_npartitions; i++) {
1227		pp = &lp->d_partitions[i];
1228		if (!part_set[i] || i == RAW_PART ||
1229		    part_size_type[i] == '%' || part_size_type[i] == '*')
1230			continue;
1231		if (pp->p_offset > base_offset)
1232			free_space += pp->p_offset - base_offset;
1233		if (pp->p_offset + pp->p_size > base_offset)
1234			base_offset = pp->p_offset + pp->p_size;
1235	}
1236	if (base_offset < lp->d_secperunit)
1237		free_space += lp->d_secperunit - base_offset;
1238
1239	/* handle % partitions - note %'s don't need to add up to 100! */
1240	if (total_percent != 0) {
1241		if (total_percent > 100) {
1242			fprintf(stderr,"total percentage %lu is greater than 100\n",
1243			    total_percent);
1244			errors++;
1245		}
1246
1247		if (free_space > 0) {
1248			for (i = 0; i < lp->d_npartitions; i++) {
1249				pp = &lp->d_partitions[i];
1250				if (part_set[i] && part_size_type[i] == '%') {
1251					/* careful of overflows! and integer roundoff */
1252					pp->p_size = ((double)pp->p_size/100) * free_space;
1253					total_size += pp->p_size;
1254
1255					/* FIX we can lose a sector or so due to roundoff per
1256					   partition.  A more complex algorithm could avoid that */
1257				}
1258			}
1259		} else {
1260			fprintf(stderr,
1261			    "%ld sectors available to give to '*' and '%%' partitions\n",
1262			    free_space);
1263			errors++;
1264			/* fix?  set all % partitions to size 0? */
1265		}
1266	}
1267	/* give anything remaining to the hog partition */
1268	if (hog_part != -1) {
1269		/*
1270		 * Find the range of offsets usable by '*' partitions around
1271		 * the hog partition and how much space they need.
1272		 */
1273		needed = 0;
1274		base_offset = BBSIZE / secsize;
1275		for (i = hog_part - 1; i >= 0; i--) {
1276			pp = &lp->d_partitions[i];
1277			if (!part_set[i] || i == RAW_PART)
1278				continue;
1279			if (part_offset_type[i] == '*') {
1280				needed += pp->p_size;
1281				continue;
1282			}
1283			base_offset = pp->p_offset + pp->p_size;
1284			break;
1285		}
1286		current_offset = lp->d_secperunit;
1287		for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1288			pp = &lp->d_partitions[i];
1289			if (!part_set[i] || i == RAW_PART)
1290				continue;
1291			if (part_offset_type[i] == '*') {
1292				needed += pp->p_size;
1293				continue;
1294			}
1295			current_offset = pp->p_offset;
1296		}
1297
1298		if (current_offset - base_offset <= needed) {
1299			fprintf(stderr, "Cannot find space for partition %c\n",
1300			    hog_part + 'a');
1301			fprintf(stderr,
1302			    "Need more than %lu sectors between %lu and %lu\n",
1303			    needed, base_offset, current_offset);
1304			errors++;
1305			lp->d_partitions[hog_part].p_size = 0;
1306		} else {
1307			lp->d_partitions[hog_part].p_size = current_offset -
1308			    base_offset - needed;
1309			total_size += lp->d_partitions[hog_part].p_size;
1310		}
1311	}
1312
1313	/* Now set the offsets for each partition */
1314	current_offset = BBSIZE / secsize; /* in sectors */
1315	seen_default_offset = 0;
1316	for (i = 0; i < lp->d_npartitions; i++) {
1317		part = 'a' + i;
1318		pp = &lp->d_partitions[i];
1319		if (part_set[i]) {
1320			if (part_offset_type[i] == '*') {
1321				if (i == RAW_PART) {
1322					pp->p_offset = 0;
1323				} else {
1324					pp->p_offset = current_offset;
1325					seen_default_offset = 1;
1326				}
1327			} else {
1328				/* allow them to be out of order for old-style tables */
1329				if (pp->p_offset < current_offset &&
1330				    seen_default_offset && i != RAW_PART &&
1331				    pp->p_fstype != FS_VINUM) {
1332					fprintf(stderr,
1333"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1334					    (long)pp->p_offset,i+'a',current_offset);
1335					fprintf(stderr,
1336"Labels with any *'s for offset must be in ascending order by sector\n");
1337					errors++;
1338				} else if (pp->p_offset != current_offset &&
1339				    i != RAW_PART && seen_default_offset) {
1340					/*
1341					 * this may give unneeded warnings if
1342					 * partitions are out-of-order
1343					 */
1344					warnx(
1345"Offset %ld for partition %c doesn't match expected value %ld",
1346					    (long)pp->p_offset, i + 'a', current_offset);
1347				}
1348			}
1349			if (i != RAW_PART)
1350				current_offset = pp->p_offset + pp->p_size;
1351		}
1352	}
1353
1354	for (i = 0; i < lp->d_npartitions; i++) {
1355		part = 'a' + i;
1356		pp = &lp->d_partitions[i];
1357		if (pp->p_size == 0 && pp->p_offset != 0)
1358			warnx("partition %c: size 0, but offset %lu",
1359			    part, (u_long)pp->p_offset);
1360#ifdef notdef
1361		if (pp->p_size % lp->d_secpercyl)
1362			warnx("partition %c: size %% cylinder-size != 0",
1363			    part);
1364		if (pp->p_offset % lp->d_secpercyl)
1365			warnx("partition %c: offset %% cylinder-size != 0",
1366			    part);
1367#endif
1368		if (pp->p_offset > lp->d_secperunit) {
1369			fprintf(stderr,
1370			    "partition %c: offset past end of unit\n", part);
1371			errors++;
1372		}
1373		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1374			fprintf(stderr,
1375			"partition %c: partition extends past end of unit\n",
1376			    part);
1377			errors++;
1378		}
1379		if (i == RAW_PART) {
1380			if (pp->p_fstype != FS_UNUSED)
1381				warnx("partition %c is not marked as unused!",part);
1382			if (pp->p_offset != 0)
1383				warnx("partition %c doesn't start at 0!",part);
1384			if (pp->p_size != lp->d_secperunit)
1385				warnx("partition %c doesn't cover the whole unit!",part);
1386
1387			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1388			    (pp->p_size != lp->d_secperunit)) {
1389				warnx("An incorrect partition %c may cause problems for "
1390				    "standard system utilities",part);
1391			}
1392		}
1393
1394		/* check for overlaps */
1395		/* this will check for all possible overlaps once and only once */
1396		for (j = 0; j < i; j++) {
1397			pp2 = &lp->d_partitions[j];
1398			if (j != RAW_PART && i != RAW_PART &&
1399			    pp->p_fstype != FS_VINUM &&
1400			    pp2->p_fstype != FS_VINUM &&
1401			    part_set[i] && part_set[j]) {
1402				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1403				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1404					pp2->p_offset >= pp->p_offset)) {
1405					fprintf(stderr,"partitions %c and %c overlap!\n",
1406					    j + 'a', i + 'a');
1407					errors++;
1408				}
1409			}
1410		}
1411	}
1412	for (; i < lp->d_npartitions; i++) {
1413		part = 'a' + i;
1414		pp = &lp->d_partitions[i];
1415		if (pp->p_size || pp->p_offset)
1416			warnx("unused partition %c: size %d offset %lu",
1417			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1418	}
1419	return (errors);
1420}
1421
1422/*
1423 * When operating on a "virgin" disk, try getting an initial label
1424 * from the associated device driver.  This might work for all device
1425 * drivers that are able to fetch some initial device parameters
1426 * without even having access to a (BSD) disklabel, like SCSI disks,
1427 * most IDE drives, or vn devices.
1428 *
1429 * The device name must be given in its "canonical" form.
1430 */
1431static struct disklabel *
1432getvirginlabel(void)
1433{
1434	static struct disklabel loclab;
1435	struct partition *dp;
1436	int f;
1437	u_int u;
1438
1439	if ((f = open(specname, O_RDONLY)) == -1) {
1440		warn("cannot open %s", specname);
1441		return (NULL);
1442	}
1443
1444	if (is_file)
1445		get_file_parms(f);
1446	else {
1447		mediasize = g_mediasize(f);
1448		secsize = g_sectorsize(f);
1449		if (secsize < 0 || mediasize < 0) {
1450			close (f);
1451			return (NULL);
1452		}
1453	}
1454	memset(&loclab, 0, sizeof loclab);
1455	loclab.d_magic = DISKMAGIC;
1456	loclab.d_magic2 = DISKMAGIC;
1457	loclab.d_secsize = secsize;
1458	loclab.d_secperunit = mediasize / secsize;
1459
1460	/*
1461	 * Nobody in these enligthened days uses the CHS geometry for
1462	 * anything, but nontheless try to get it right.  If we fail
1463	 * to get any good ideas from the device, construct something
1464	 * which is IBM-PC friendly.
1465	 */
1466	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1467		loclab.d_nsectors = u;
1468	else
1469		loclab.d_nsectors = 63;
1470	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1471		loclab.d_ntracks = u;
1472	else if (loclab.d_secperunit <= 63*1*1024)
1473		loclab.d_ntracks = 1;
1474	else if (loclab.d_secperunit <= 63*16*1024)
1475		loclab.d_ntracks = 16;
1476	else
1477		loclab.d_ntracks = 255;
1478	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1479	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1480	loclab.d_npartitions = DEFPARTITIONS;
1481
1482	/* Various (unneeded) compat stuff */
1483	loclab.d_rpm = 3600;
1484	loclab.d_bbsize = BBSIZE;
1485	loclab.d_interleave = 1;
1486	strncpy(loclab.d_typename, "amnesiac",
1487	    sizeof(loclab.d_typename));
1488
1489	dp = &loclab.d_partitions[RAW_PART];
1490	dp->p_size = loclab.d_secperunit;
1491	loclab.d_checksum = dkcksum(&loclab);
1492	close (f);
1493	return (&loclab);
1494}
1495
1496static void
1497usage(void)
1498{
1499
1500	fprintf(stderr,
1501	"%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1502	"usage: bsdlabel disk",
1503	"\t\t(to read label)",
1504	"	bsdlabel -w [-n] [-m machine] disk [type]",
1505	"\t\t(to write label with existing boot program)",
1506	"	bsdlabel -e [-n] [-m machine] disk",
1507	"\t\t(to edit label)",
1508	"	bsdlabel -R [-n] [-m machine] disk protofile",
1509	"\t\t(to restore label with existing boot program)",
1510	"	bsdlabel -B [-b boot] [-m machine] disk",
1511	"\t\t(to install boot program with existing on-disk label)",
1512	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1513	"\t\t(to write label and install boot program)",
1514	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1515		"\t\t(to restore label and install boot program)"
1516	);
1517	exit(1);
1518}
1519