bsdlabel.c revision 219448 
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 219448 2011-03-10 08:24:21Z uqs $");
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	geom_bsd_available(void);
84static int	writelabel(void);
85static int	readlabel(int flag);
86static void	display(FILE *, const struct disklabel *);
87static int	edit(void);
88static int	editit(void);
89static void	fixlabel(struct disklabel *);
90static char	*skip(char *);
91static char	*word(char *);
92static int	getasciilabel(FILE *, struct disklabel *);
93static int	getasciipartspec(char *, struct disklabel *, int, int);
94static int	checklabel(struct disklabel *);
95static void	usage(void);
96static struct disklabel *getvirginlabel(void);
97
98#define	DEFEDITOR	_PATH_VI
99#define	DEFPARTITIONS	8
100
101static char	*specname;
102static char	*pname;
103static char	tmpfil[] = PATH_TMPFILE;
104
105static struct	disklabel lab;
106static u_char	bootarea[BBSIZE];
107static off_t	mediasize;
108static u_int	secsize;
109static char	blank[] = "";
110static char	unknown[] = "unknown";
111
112#define MAX_PART ('z')
113#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
114static char    part_size_type[MAX_NUM_PARTS];
115static char    part_offset_type[MAX_NUM_PARTS];
116static int     part_set[MAX_NUM_PARTS];
117
118static int	installboot;	/* non-zero if we should install a boot program */
119static int	allfields;	/* present all fields in edit */
120static char const *xxboot;	/* primary boot */
121
122static uint32_t lba_offset;
123#ifndef LABELSECTOR
124#define LABELSECTOR -1
125#endif
126#ifndef LABELOFFSET
127#define LABELOFFSET -1
128#endif
129static int labelsoffset = LABELSECTOR;
130static int labeloffset = LABELOFFSET;
131static int bbsize = BBSIZE;
132
133enum	{
134	UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
135} op = UNSPEC;
136
137
138static int	disable_write;   /* set to disable writing to disk label */
139static int	is_file;	/* work on a file (abs. pathname), "-f" opt. */
140
141int
142main(int argc, char *argv[])
143{
144	FILE *t;
145	int ch, error, fd;
146	const char *name;
147
148	error = 0;
149	name = NULL;
150
151	while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
152		switch (ch) {
153			case 'A':
154				allfields = 1;
155				break;
156			case 'B':
157				++installboot;
158				break;
159			case 'b':
160				xxboot = optarg;
161				break;
162			case 'f':
163				is_file=1;
164				break;
165			case 'm':
166				if (!strcmp(optarg, "i386") ||
167				    !strcmp(optarg, "amd64") ||
168				    !strcmp(optarg, "ia64") ||
169				    !strcmp(optarg, "pc98")) {
170					labelsoffset = 1;
171					labeloffset = 0;
172					bbsize = 8192;
173				} else {
174					errx(1, "Unsupported architecture");
175				}
176				break;
177			case 'n':
178				disable_write = 1;
179				break;
180			case 'R':
181				if (op != UNSPEC)
182					usage();
183				op = RESTORE;
184				break;
185			case 'e':
186				if (op != UNSPEC)
187					usage();
188				op = EDIT;
189				break;
190			case 'r':
191				/*
192				 * We accept and ignode -r for compatibility with
193				 * historically disklabel usage.
194				 */
195				break;
196			case 'w':
197				if (op != UNSPEC)
198					usage();
199				op = WRITE;
200				break;
201			case '?':
202			default:
203				usage();
204		}
205	argc -= optind;
206	argv += optind;
207
208	if (argc < 1)
209		usage();
210	if (labelsoffset < 0 || labeloffset < 0)
211		errx(1, "a -m <architecture> option must be specified");
212
213	/* Figure out the names of the thing we're working on */
214	if (is_file) {
215		specname = argv[0];
216	} else {
217		specname = g_device_path(argv[0]);
218		if (specname == NULL) {
219			warn("unable to get correct path for %s", argv[0]);
220			return(1);
221		}
222		fd = open(specname, O_RDONLY);
223		if (fd < 0) {
224			warn("error opening %s", specname);
225			return(1);
226		}
227		pname = g_providername(fd);
228		if (pname == NULL) {
229			warn("error getting providername for %s", specname);
230			close(fd);
231			return(1);
232		}
233		close(fd);
234	}
235
236	if (installboot && op == UNSPEC)
237		op = WRITEBOOT;
238	else if (op == UNSPEC)
239		op = READ;
240
241	switch(op) {
242
243	case UNSPEC:
244		break;
245
246	case EDIT:
247		if (argc != 1)
248			usage();
249		readlabel(1);
250		fixlabel(&lab);
251		error = edit();
252		break;
253
254	case READ:
255		if (argc != 1)
256			usage();
257		readlabel(1);
258		display(stdout, NULL);
259		error = checklabel(NULL);
260		break;
261
262	case RESTORE:
263		if (argc != 2)
264			usage();
265		if (!(t = fopen(argv[1], "r")))
266			err(4, "fopen %s", argv[1]);
267		readlabel(0);
268		if (!getasciilabel(t, &lab))
269			exit(1);
270		error = writelabel();
271		break;
272
273	case WRITE:
274		if (argc == 2)
275			name = argv[1];
276		else if (argc == 1)
277			name = "auto";
278		else
279			usage();
280		readlabel(0);
281		makelabel(name, &lab);
282		fixlabel(&lab);
283		if (checklabel(NULL) == 0)
284			error = writelabel();
285		break;
286
287	case WRITEBOOT:
288
289		readlabel(1);
290		fixlabel(&lab);
291		if (argc == 2)
292			makelabel(argv[1], &lab);
293		if (checklabel(NULL) == 0)
294			error = writelabel();
295		break;
296	}
297	exit(error);
298}
299
300static void
301fixlabel(struct disklabel *lp)
302{
303	struct partition *dp;
304	int i;
305
306	for (i = 0; i < lp->d_npartitions; i++) {
307		if (i == RAW_PART)
308			continue;
309		if (lp->d_partitions[i].p_size)
310			return;
311	}
312
313	dp = &lp->d_partitions[0];
314	dp->p_offset = BBSIZE / secsize;
315	dp->p_size = lp->d_secperunit - dp->p_offset;
316}
317
318/*
319 * Construct a prototype disklabel from /etc/disktab.
320 */
321static void
322makelabel(const char *type, struct disklabel *lp)
323{
324	struct disklabel *dp;
325
326	if (strcmp(type, "auto") == 0)
327		dp = getvirginlabel();
328	else
329		dp = getdiskbyname(type);
330	if (dp == NULL)
331		errx(1, "%s: unknown disk type", type);
332	*lp = *dp;
333	bzero(lp->d_packname, sizeof(lp->d_packname));
334}
335
336static void
337readboot(void)
338{
339	int fd;
340	struct stat st;
341
342	if (xxboot == NULL)
343		xxboot = "/boot/boot";
344	fd = open(xxboot, O_RDONLY);
345	if (fd < 0)
346		err(1, "cannot open %s", xxboot);
347	fstat(fd, &st);
348	if (st.st_size <= BBSIZE) {
349		if (read(fd, bootarea, st.st_size) != st.st_size)
350			err(1, "read error %s", xxboot);
351		close(fd);
352		return;
353	}
354	errx(1, "boot code %s is wrong size", xxboot);
355}
356
357static int
358geom_bsd_available(void)
359{
360	struct gclass *class;
361	struct gmesh mesh;
362	int error;
363
364	error = geom_gettree(&mesh);
365	if (error != 0)
366		errc(1, error, "Cannot get GEOM tree");
367
368	LIST_FOREACH(class, &mesh.lg_class, lg_class) {
369		if (strcmp(class->lg_name, "BSD") == 0) {
370			geom_deletetree(&mesh);
371			return (1);
372		}
373	}
374
375	geom_deletetree(&mesh);
376
377	return (0);
378}
379
380static int
381writelabel(void)
382{
383	int i, fd, serrno;
384	struct gctl_req *grq;
385	char const *errstr;
386	struct disklabel *lp = &lab;
387
388	if (disable_write) {
389		warnx("write to disk label supressed - label was as follows:");
390		display(stdout, NULL);
391		return (0);
392	}
393
394	lp->d_magic = DISKMAGIC;
395	lp->d_magic2 = DISKMAGIC;
396	lp->d_checksum = 0;
397	lp->d_checksum = dkcksum(lp);
398	if (installboot)
399		readboot();
400	for (i = 0; i < lab.d_npartitions; i++)
401		if (lab.d_partitions[i].p_size)
402			lab.d_partitions[i].p_offset += lba_offset;
403	bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
404	    lp);
405
406	fd = open(specname, O_RDWR);
407	if (fd < 0) {
408		if (is_file) {
409			warn("cannot open file %s for writing label", specname);
410			return(1);
411		} else
412			serrno = errno;
413
414		/* Give up if GEOM_BSD is not available. */
415		if (geom_bsd_available() == 0) {
416			warnc(serrno, "%s", specname);
417			return (1);
418		}
419
420		grq = gctl_get_handle();
421		gctl_ro_param(grq, "verb", -1, "write label");
422		gctl_ro_param(grq, "class", -1, "BSD");
423		gctl_ro_param(grq, "geom", -1, pname);
424		gctl_ro_param(grq, "label", 148+16*8,
425			bootarea + labeloffset + labelsoffset * secsize);
426		errstr = gctl_issue(grq);
427		if (errstr != NULL) {
428			warnx("%s", errstr);
429			gctl_free(grq);
430			return(1);
431		}
432		gctl_free(grq);
433		if (installboot) {
434			grq = gctl_get_handle();
435			gctl_ro_param(grq, "verb", -1, "write bootcode");
436			gctl_ro_param(grq, "class", -1, "BSD");
437			gctl_ro_param(grq, "geom", -1, pname);
438			gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
439			errstr = gctl_issue(grq);
440			if (errstr != NULL) {
441				warnx("%s", errstr);
442				gctl_free(grq);
443				return (1);
444			}
445			gctl_free(grq);
446		}
447	} else {
448		if (write(fd, bootarea, bbsize) != bbsize) {
449			warn("write %s", specname);
450			close (fd);
451			return (1);
452		}
453		close (fd);
454	}
455	return (0);
456}
457
458static void
459get_file_parms(int f)
460{
461	int i;
462	struct stat sb;
463
464	if (fstat(f, &sb) != 0)
465		err(4, "fstat failed");
466	i = sb.st_mode & S_IFMT;
467	if (i != S_IFREG && i != S_IFLNK)
468		errx(4, "%s is not a valid file or link", specname);
469	secsize = DEV_BSIZE;
470	mediasize = sb.st_size;
471}
472
473/*
474 * Fetch disklabel for disk.
475 */
476static int
477readlabel(int flag)
478{
479	ssize_t nbytes;
480	uint32_t lba;
481	int f, i;
482	int error;
483
484	f = open(specname, O_RDONLY);
485	if (f < 0)
486		err(1, "%s", specname);
487	if (is_file)
488		get_file_parms(f);
489	else {
490		mediasize = g_mediasize(f);
491		secsize = g_sectorsize(f);
492		if (secsize < 0 || mediasize < 0)
493			err(4, "cannot get disk geometry");
494	}
495	if (mediasize > (off_t)0xffffffff * secsize)
496		errx(1,
497		    "disks with more than 2^32-1 sectors are not supported");
498	(void)lseek(f, (off_t)0, SEEK_SET);
499	nbytes = read(f, bootarea, BBSIZE);
500	if (nbytes == -1)
501		err(4, "%s read", specname);
502	if (nbytes != BBSIZE)
503		errx(4, "couldn't read %d bytes from %s", BBSIZE, 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
514	/*
515	 * Compensate for absolute block addressing by finding the
516	 * smallest partition offset and if the offset of the 'c'
517	 * partition is equal to that, subtract it from all offsets.
518	 */
519	lba = ~0;
520	for (i = 0; i < lab.d_npartitions; i++) {
521		if (lab.d_partitions[i].p_size)
522			lba = MIN(lba, lab.d_partitions[i].p_offset);
523	}
524	if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
525		for (i = 0; i < lab.d_npartitions; i++) {
526			if (lab.d_partitions[i].p_size)
527				lab.d_partitions[i].p_offset -= lba;
528		}
529		/*
530		 * Save the offset so that we can write the label
531		 * back with absolute block addresses.
532		 */
533		lba_offset = lba;
534	}
535	return (error);
536}
537
538
539static void
540display(FILE *f, const struct disklabel *lp)
541{
542	int i, j;
543	const struct partition *pp;
544
545	if (lp == NULL)
546		lp = &lab;
547
548	fprintf(f, "# %s:\n", specname);
549	if (allfields) {
550		if (lp->d_type < DKMAXTYPES)
551			fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
552		else
553			fprintf(f, "type: %u\n", lp->d_type);
554		fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
555			lp->d_typename);
556		fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
557			lp->d_packname);
558		fprintf(f, "flags:");
559		if (lp->d_flags & D_REMOVABLE)
560			fprintf(f, " removeable");
561		if (lp->d_flags & D_ECC)
562			fprintf(f, " ecc");
563		if (lp->d_flags & D_BADSECT)
564			fprintf(f, " badsect");
565		fprintf(f, "\n");
566		fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
567		fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
568		fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
569		fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
570		fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
571		fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
572		fprintf(f, "rpm: %u\n", lp->d_rpm);
573		fprintf(f, "interleave: %u\n", lp->d_interleave);
574		fprintf(f, "trackskew: %u\n", lp->d_trackskew);
575		fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
576		fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
577		    (u_long)lp->d_headswitch);
578		fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
579		    (u_long)lp->d_trkseek);
580		fprintf(f, "drivedata: ");
581		for (i = NDDATA - 1; i >= 0; i--)
582			if (lp->d_drivedata[i])
583				break;
584		if (i < 0)
585			i = 0;
586		for (j = 0; j <= i; j++)
587			fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
588		fprintf(f, "\n\n");
589	}
590	fprintf(f, "%u partitions:\n", lp->d_npartitions);
591	fprintf(f,
592	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
593	pp = lp->d_partitions;
594	for (i = 0; i < lp->d_npartitions; i++, pp++) {
595		if (pp->p_size) {
596			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
597			   (u_long)pp->p_size, (u_long)pp->p_offset);
598			if (pp->p_fstype < FSMAXTYPES)
599				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
600			else
601				fprintf(f, "%8d", pp->p_fstype);
602			switch (pp->p_fstype) {
603
604			case FS_UNUSED:				/* XXX */
605				fprintf(f, "    %5lu %5lu %5.5s ",
606				    (u_long)pp->p_fsize,
607				    (u_long)(pp->p_fsize * pp->p_frag), "");
608				break;
609
610			case FS_BSDFFS:
611				fprintf(f, "    %5lu %5lu %5u ",
612				    (u_long)pp->p_fsize,
613				    (u_long)(pp->p_fsize * pp->p_frag),
614				    pp->p_cpg);
615				break;
616
617			case FS_BSDLFS:
618				fprintf(f, "    %5lu %5lu %5d",
619				    (u_long)pp->p_fsize,
620				    (u_long)(pp->p_fsize * pp->p_frag),
621				    pp->p_cpg);
622				break;
623
624			default:
625				fprintf(f, "%20.20s", "");
626				break;
627			}
628			if (i == RAW_PART) {
629				fprintf(f, "  # \"raw\" part, don't edit");
630			}
631			fprintf(f, "\n");
632		}
633	}
634	fflush(f);
635}
636
637static int
638edit(void)
639{
640	int c, fd;
641	struct disklabel label;
642	FILE *fp;
643
644	if ((fd = mkstemp(tmpfil)) == -1 ||
645	    (fp = fdopen(fd, "w")) == NULL) {
646		warnx("can't create %s", tmpfil);
647		return (1);
648	}
649	display(fp, NULL);
650	fclose(fp);
651	for (;;) {
652		if (!editit())
653			break;
654		fp = fopen(tmpfil, "r");
655		if (fp == NULL) {
656			warnx("can't reopen %s for reading", tmpfil);
657			break;
658		}
659		bzero((char *)&label, sizeof(label));
660		c = getasciilabel(fp, &label);
661		fclose(fp);
662		if (c) {
663			lab = label;
664			if (writelabel() == 0) {
665				(void) unlink(tmpfil);
666				return (0);
667			}
668		}
669		printf("re-edit the label? [y]: ");
670		fflush(stdout);
671		c = getchar();
672		if (c != EOF && c != (int)'\n')
673			while (getchar() != (int)'\n')
674				;
675		if  (c == (int)'n')
676			break;
677	}
678	(void) unlink(tmpfil);
679	return (1);
680}
681
682static int
683editit(void)
684{
685	int pid, xpid;
686	int locstat, omask;
687	const char *ed;
688	uid_t uid;
689	gid_t gid;
690
691	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
692	while ((pid = fork()) < 0) {
693		if (errno == EPROCLIM) {
694			warnx("you have too many processes");
695			return(0);
696		}
697		if (errno != EAGAIN) {
698			warn("fork");
699			return(0);
700		}
701		sleep(1);
702	}
703	if (pid == 0) {
704		sigsetmask(omask);
705		gid = getgid();
706		if (setresgid(gid, gid, gid) == -1)
707			err(1, "setresgid");
708		uid = getuid();
709		if (setresuid(uid, uid, uid) == -1)
710			err(1, "setresuid");
711		if ((ed = getenv("EDITOR")) == (char *)0)
712			ed = DEFEDITOR;
713		execlp(ed, ed, tmpfil, (char *)0);
714		err(1, "%s", ed);
715	}
716	while ((xpid = wait(&locstat)) >= 0)
717		if (xpid == pid)
718			break;
719	sigsetmask(omask);
720	return(!locstat);
721}
722
723static char *
724skip(char *cp)
725{
726
727	while (*cp != '\0' && isspace(*cp))
728		cp++;
729	if (*cp == '\0' || *cp == '#')
730		return (NULL);
731	return (cp);
732}
733
734static char *
735word(char *cp)
736{
737	char c;
738
739	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
740		cp++;
741	if ((c = *cp) != '\0') {
742		*cp++ = '\0';
743		if (c != '#')
744			return (skip(cp));
745	}
746	return (NULL);
747}
748
749/*
750 * Read an ascii label in from fd f,
751 * in the same format as that put out by display(),
752 * and fill in lp.
753 */
754static int
755getasciilabel(FILE *f, struct disklabel *lp)
756{
757	char *cp, *endp;
758	const char **cpp;
759	u_int part;
760	char *tp, line[BUFSIZ];
761	u_long v;
762	int lineno = 0, errors = 0;
763	int i;
764
765	makelabel("auto", lp);
766	bzero(&part_set, sizeof(part_set));
767	bzero(&part_size_type, sizeof(part_size_type));
768	bzero(&part_offset_type, sizeof(part_offset_type));
769	lp->d_bbsize = BBSIZE;				/* XXX */
770	lp->d_sbsize = 0;				/* XXX */
771	while (fgets(line, sizeof(line) - 1, f)) {
772		lineno++;
773		if ((cp = index(line,'\n')) != 0)
774			*cp = '\0';
775		cp = skip(line);
776		if (cp == NULL)
777			continue;
778		tp = index(cp, ':');
779		if (tp == NULL) {
780			fprintf(stderr, "line %d: syntax error\n", lineno);
781			errors++;
782			continue;
783		}
784		*tp++ = '\0', tp = skip(tp);
785		if (!strcmp(cp, "type")) {
786			if (tp == NULL)
787				tp = unknown;
788			cpp = dktypenames;
789			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
790				if (*cpp && !strcmp(*cpp, tp)) {
791					lp->d_type = cpp - dktypenames;
792					break;
793				}
794			if (cpp < &dktypenames[DKMAXTYPES])
795				continue;
796			errno = 0;
797			v = strtoul(tp, &endp, 10);
798			if (errno != 0 || *endp != '\0')
799				v = DKMAXTYPES;
800			if (v >= DKMAXTYPES)
801				fprintf(stderr, "line %d:%s %lu\n", lineno,
802				    "Warning, unknown disk type", v);
803			else
804				lp->d_type = v;
805			continue;
806		}
807		if (!strcmp(cp, "flags")) {
808			for (v = 0; (cp = tp) && *cp != '\0';) {
809				tp = word(cp);
810				if (!strcmp(cp, "removeable"))
811					v |= D_REMOVABLE;
812				else if (!strcmp(cp, "ecc"))
813					v |= D_ECC;
814				else if (!strcmp(cp, "badsect"))
815					v |= D_BADSECT;
816				else {
817					fprintf(stderr,
818					    "line %d: %s: bad flag\n",
819					    lineno, cp);
820					errors++;
821				}
822			}
823			lp->d_flags = v;
824			continue;
825		}
826		if (!strcmp(cp, "drivedata")) {
827			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
828				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
829				tp = word(cp);
830			}
831			continue;
832		}
833		if (sscanf(cp, "%lu partitions", &v) == 1) {
834			if (v == 0 || v > MAXPARTITIONS) {
835				fprintf(stderr,
836				    "line %d: bad # of partitions\n", lineno);
837				lp->d_npartitions = MAXPARTITIONS;
838				errors++;
839			} else
840				lp->d_npartitions = v;
841			continue;
842		}
843		if (tp == NULL)
844			tp = blank;
845		if (!strcmp(cp, "disk")) {
846			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
847			continue;
848		}
849		if (!strcmp(cp, "label")) {
850			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
851			continue;
852		}
853		if (!strcmp(cp, "bytes/sector")) {
854			v = strtoul(tp, NULL, 10);
855			if (v == 0 || (v % DEV_BSIZE) != 0) {
856				fprintf(stderr,
857				    "line %d: %s: bad sector size\n",
858				    lineno, tp);
859				errors++;
860			} else
861				lp->d_secsize = v;
862			continue;
863		}
864		if (!strcmp(cp, "sectors/track")) {
865			v = strtoul(tp, NULL, 10);
866#if (ULONG_MAX != 0xffffffffUL)
867			if (v == 0 || v > 0xffffffff)
868#else
869			if (v == 0)
870#endif
871			{
872				fprintf(stderr, "line %d: %s: bad %s\n",
873				    lineno, tp, cp);
874				errors++;
875			} else
876				lp->d_nsectors = v;
877			continue;
878		}
879		if (!strcmp(cp, "sectors/cylinder")) {
880			v = strtoul(tp, NULL, 10);
881			if (v == 0) {
882				fprintf(stderr, "line %d: %s: bad %s\n",
883				    lineno, tp, cp);
884				errors++;
885			} else
886				lp->d_secpercyl = v;
887			continue;
888		}
889		if (!strcmp(cp, "tracks/cylinder")) {
890			v = strtoul(tp, NULL, 10);
891			if (v == 0) {
892				fprintf(stderr, "line %d: %s: bad %s\n",
893				    lineno, tp, cp);
894				errors++;
895			} else
896				lp->d_ntracks = v;
897			continue;
898		}
899		if (!strcmp(cp, "cylinders")) {
900			v = strtoul(tp, NULL, 10);
901			if (v == 0) {
902				fprintf(stderr, "line %d: %s: bad %s\n",
903				    lineno, tp, cp);
904				errors++;
905			} else
906				lp->d_ncylinders = v;
907			continue;
908		}
909		if (!strcmp(cp, "sectors/unit")) {
910			v = strtoul(tp, NULL, 10);
911			if (v == 0) {
912				fprintf(stderr, "line %d: %s: bad %s\n",
913				    lineno, tp, cp);
914				errors++;
915			} else
916				lp->d_secperunit = v;
917			continue;
918		}
919		if (!strcmp(cp, "rpm")) {
920			v = strtoul(tp, NULL, 10);
921			if (v == 0 || v > USHRT_MAX) {
922				fprintf(stderr, "line %d: %s: bad %s\n",
923				    lineno, tp, cp);
924				errors++;
925			} else
926				lp->d_rpm = v;
927			continue;
928		}
929		if (!strcmp(cp, "interleave")) {
930			v = strtoul(tp, NULL, 10);
931			if (v == 0 || v > USHRT_MAX) {
932				fprintf(stderr, "line %d: %s: bad %s\n",
933				    lineno, tp, cp);
934				errors++;
935			} else
936				lp->d_interleave = v;
937			continue;
938		}
939		if (!strcmp(cp, "trackskew")) {
940			v = strtoul(tp, NULL, 10);
941			if (v > USHRT_MAX) {
942				fprintf(stderr, "line %d: %s: bad %s\n",
943				    lineno, tp, cp);
944				errors++;
945			} else
946				lp->d_trackskew = v;
947			continue;
948		}
949		if (!strcmp(cp, "cylinderskew")) {
950			v = strtoul(tp, NULL, 10);
951			if (v > USHRT_MAX) {
952				fprintf(stderr, "line %d: %s: bad %s\n",
953				    lineno, tp, cp);
954				errors++;
955			} else
956				lp->d_cylskew = v;
957			continue;
958		}
959		if (!strcmp(cp, "headswitch")) {
960			v = strtoul(tp, NULL, 10);
961			lp->d_headswitch = v;
962			continue;
963		}
964		if (!strcmp(cp, "track-to-track seek")) {
965			v = strtoul(tp, NULL, 10);
966			lp->d_trkseek = v;
967			continue;
968		}
969		/* the ':' was removed above */
970		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
971			fprintf(stderr,
972			    "line %d: %s: Unknown disklabel field\n", lineno,
973			    cp);
974			errors++;
975			continue;
976		}
977
978		/* Process a partition specification line. */
979		part = *cp - 'a';
980		if (part >= lp->d_npartitions) {
981			fprintf(stderr,
982			    "line %d: partition name out of range a-%c: %s\n",
983			    lineno, 'a' + lp->d_npartitions - 1, cp);
984			errors++;
985			continue;
986		}
987		part_set[part] = 1;
988
989		if (getasciipartspec(tp, lp, part, lineno) != 0) {
990			errors++;
991			break;
992		}
993	}
994	errors += checklabel(lp);
995	return (errors == 0);
996}
997
998#define NXTNUM(n) do { \
999	if (tp == NULL) { \
1000		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1001		return (1); \
1002	} else { \
1003		cp = tp, tp = word(cp); \
1004		(n) = strtoul(cp, NULL, 10); \
1005	} \
1006} while (0)
1007
1008/* retain 1 character following number */
1009#define NXTWORD(w,n) do { \
1010	if (tp == NULL) { \
1011		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1012		return (1); \
1013	} else { \
1014		char *tmp; \
1015		cp = tp, tp = word(cp); \
1016		(n) = strtoul(cp, &tmp, 10); \
1017		if (tmp) (w) = *tmp; \
1018	} \
1019} while (0)
1020
1021/*
1022 * Read a partition line into partition `part' in the specified disklabel.
1023 * Return 0 on success, 1 on failure.
1024 */
1025static int
1026getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1027{
1028	struct partition *pp;
1029	char *cp, *endp;
1030	const char **cpp;
1031	u_long v;
1032
1033	pp = &lp->d_partitions[part];
1034	cp = NULL;
1035
1036	v = 0;
1037	NXTWORD(part_size_type[part],v);
1038	if (v == 0 && part_size_type[part] != '*') {
1039		fprintf(stderr,
1040		    "line %d: %s: bad partition size\n", lineno, cp);
1041		return (1);
1042	}
1043	pp->p_size = v;
1044
1045	v = 0;
1046	NXTWORD(part_offset_type[part],v);
1047	if (v == 0 && part_offset_type[part] != '*' &&
1048	    part_offset_type[part] != '\0') {
1049		fprintf(stderr,
1050		    "line %d: %s: bad partition offset\n", lineno, cp);
1051		return (1);
1052	}
1053	pp->p_offset = v;
1054	if (tp == NULL) {
1055		fprintf(stderr, "line %d: missing file system type\n", lineno);
1056		return (1);
1057	}
1058	cp = tp, tp = word(cp);
1059	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1060		if (*cpp && !strcmp(*cpp, cp))
1061			break;
1062	if (*cpp != NULL) {
1063		pp->p_fstype = cpp - fstypenames;
1064	} else {
1065		if (isdigit(*cp)) {
1066			errno = 0;
1067			v = strtoul(cp, &endp, 10);
1068			if (errno != 0 || *endp != '\0')
1069				v = FSMAXTYPES;
1070		} else
1071			v = FSMAXTYPES;
1072		if (v >= FSMAXTYPES) {
1073			fprintf(stderr,
1074			    "line %d: Warning, unknown file system type %s\n",
1075			    lineno, cp);
1076			v = FS_UNUSED;
1077		}
1078		pp->p_fstype = v;
1079	}
1080
1081	switch (pp->p_fstype) {
1082	case FS_UNUSED:
1083	case FS_BSDFFS:
1084	case FS_BSDLFS:
1085		/* accept defaults for fsize/frag/cpg */
1086		if (tp) {
1087			NXTNUM(pp->p_fsize);
1088			if (pp->p_fsize == 0)
1089				break;
1090			NXTNUM(v);
1091			pp->p_frag = v / pp->p_fsize;
1092			if (tp != NULL)
1093				NXTNUM(pp->p_cpg);
1094		}
1095		/* else default to 0's */
1096		break;
1097	default:
1098		break;
1099	}
1100	return (0);
1101}
1102
1103/*
1104 * Check disklabel for errors and fill in
1105 * derived fields according to supplied values.
1106 */
1107static int
1108checklabel(struct disklabel *lp)
1109{
1110	struct partition *pp;
1111	int i, errors = 0;
1112	char part;
1113	u_long base_offset, needed, total_size, total_percent, current_offset;
1114	long free_space;
1115	int seen_default_offset;
1116	int hog_part;
1117	int j;
1118	struct partition *pp2;
1119
1120	if (lp == NULL)
1121		lp = &lab;
1122
1123	if (allfields) {
1124
1125		if (lp->d_secsize == 0) {
1126			fprintf(stderr, "sector size 0\n");
1127			return (1);
1128		}
1129		if (lp->d_nsectors == 0) {
1130			fprintf(stderr, "sectors/track 0\n");
1131			return (1);
1132		}
1133		if (lp->d_ntracks == 0) {
1134			fprintf(stderr, "tracks/cylinder 0\n");
1135			return (1);
1136		}
1137		if  (lp->d_ncylinders == 0) {
1138			fprintf(stderr, "cylinders/unit 0\n");
1139			errors++;
1140		}
1141		if (lp->d_rpm == 0)
1142			warnx("revolutions/minute 0");
1143		if (lp->d_secpercyl == 0)
1144			lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1145		if (lp->d_secperunit == 0)
1146			lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1147		if (lp->d_bbsize == 0) {
1148			fprintf(stderr, "boot block size 0\n");
1149			errors++;
1150		} else if (lp->d_bbsize % lp->d_secsize)
1151			warnx("boot block size %% sector-size != 0");
1152		if (lp->d_npartitions > MAXPARTITIONS)
1153			warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1154			    (u_long)lp->d_npartitions, MAXPARTITIONS);
1155	} else {
1156		struct disklabel *vl;
1157
1158		vl = getvirginlabel();
1159		lp->d_secsize = vl->d_secsize;
1160		lp->d_nsectors = vl->d_nsectors;
1161		lp->d_ntracks = vl->d_ntracks;
1162		lp->d_ncylinders = vl->d_ncylinders;
1163		lp->d_rpm = vl->d_rpm;
1164		lp->d_interleave = vl->d_interleave;
1165		lp->d_secpercyl = vl->d_secpercyl;
1166		lp->d_secperunit = vl->d_secperunit;
1167		lp->d_bbsize = vl->d_bbsize;
1168		lp->d_npartitions = vl->d_npartitions;
1169	}
1170
1171
1172	/* first allocate space to the partitions, then offsets */
1173	total_size = 0; /* in sectors */
1174	total_percent = 0; /* in percent */
1175	hog_part = -1;
1176	/* find all fixed partitions */
1177	for (i = 0; i < lp->d_npartitions; i++) {
1178		pp = &lp->d_partitions[i];
1179		if (part_set[i]) {
1180			if (part_size_type[i] == '*') {
1181				if (i == RAW_PART) {
1182					pp->p_size = lp->d_secperunit;
1183				} else {
1184					if (hog_part != -1)
1185						warnx("Too many '*' partitions (%c and %c)",
1186						    hog_part + 'a',i + 'a');
1187					else
1188						hog_part = i;
1189				}
1190			} else {
1191				off_t size;
1192
1193				size = pp->p_size;
1194				switch (part_size_type[i]) {
1195				case '%':
1196					total_percent += size;
1197					break;
1198				case 't':
1199				case 'T':
1200					size *= 1024ULL;
1201					/* FALLTHROUGH */
1202				case 'g':
1203				case 'G':
1204					size *= 1024ULL;
1205					/* FALLTHROUGH */
1206				case 'm':
1207				case 'M':
1208					size *= 1024ULL;
1209					/* FALLTHROUGH */
1210				case 'k':
1211				case 'K':
1212					size *= 1024ULL;
1213					break;
1214				case '\0':
1215					break;
1216				default:
1217					warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1218					    part_size_type[i], i + 'a');
1219					break;
1220				}
1221				/* don't count %'s yet */
1222				if (part_size_type[i] != '%') {
1223					/*
1224					 * for all not in sectors, convert to
1225					 * sectors
1226					 */
1227					if (part_size_type[i] != '\0') {
1228						if (size % lp->d_secsize != 0)
1229							warnx("partition %c not an integer number of sectors",
1230							    i + 'a');
1231						size /= lp->d_secsize;
1232						pp->p_size = size;
1233					}
1234					/* else already in sectors */
1235					if (i != RAW_PART)
1236						total_size += size;
1237				}
1238			}
1239		}
1240	}
1241
1242	/* Find out the total free space, excluding the boot block area. */
1243	base_offset = BBSIZE / secsize;
1244	free_space = 0;
1245	for (i = 0; i < lp->d_npartitions; i++) {
1246		pp = &lp->d_partitions[i];
1247		if (!part_set[i] || i == RAW_PART ||
1248		    part_size_type[i] == '%' || part_size_type[i] == '*')
1249			continue;
1250		if (pp->p_offset > base_offset)
1251			free_space += pp->p_offset - base_offset;
1252		if (pp->p_offset + pp->p_size > base_offset)
1253			base_offset = pp->p_offset + pp->p_size;
1254	}
1255	if (base_offset < lp->d_secperunit)
1256		free_space += lp->d_secperunit - base_offset;
1257
1258	/* handle % partitions - note %'s don't need to add up to 100! */
1259	if (total_percent != 0) {
1260		if (total_percent > 100) {
1261			fprintf(stderr,"total percentage %lu is greater than 100\n",
1262			    total_percent);
1263			errors++;
1264		}
1265
1266		if (free_space > 0) {
1267			for (i = 0; i < lp->d_npartitions; i++) {
1268				pp = &lp->d_partitions[i];
1269				if (part_set[i] && part_size_type[i] == '%') {
1270					/* careful of overflows! and integer roundoff */
1271					pp->p_size = ((double)pp->p_size/100) * free_space;
1272					total_size += pp->p_size;
1273
1274					/* FIX we can lose a sector or so due to roundoff per
1275					   partition.  A more complex algorithm could avoid that */
1276				}
1277			}
1278		} else {
1279			fprintf(stderr,
1280			    "%ld sectors available to give to '*' and '%%' partitions\n",
1281			    free_space);
1282			errors++;
1283			/* fix?  set all % partitions to size 0? */
1284		}
1285	}
1286	/* give anything remaining to the hog partition */
1287	if (hog_part != -1) {
1288		/*
1289		 * Find the range of offsets usable by '*' partitions around
1290		 * the hog partition and how much space they need.
1291		 */
1292		needed = 0;
1293		base_offset = BBSIZE / secsize;
1294		for (i = hog_part - 1; i >= 0; i--) {
1295			pp = &lp->d_partitions[i];
1296			if (!part_set[i] || i == RAW_PART)
1297				continue;
1298			if (part_offset_type[i] == '*') {
1299				needed += pp->p_size;
1300				continue;
1301			}
1302			base_offset = pp->p_offset + pp->p_size;
1303			break;
1304		}
1305		current_offset = lp->d_secperunit;
1306		for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1307			pp = &lp->d_partitions[i];
1308			if (!part_set[i] || i == RAW_PART)
1309				continue;
1310			if (part_offset_type[i] == '*') {
1311				needed += pp->p_size;
1312				continue;
1313			}
1314			current_offset = pp->p_offset;
1315		}
1316
1317		if (current_offset - base_offset <= needed) {
1318			fprintf(stderr, "Cannot find space for partition %c\n",
1319			    hog_part + 'a');
1320			fprintf(stderr,
1321			    "Need more than %lu sectors between %lu and %lu\n",
1322			    needed, base_offset, current_offset);
1323			errors++;
1324			lp->d_partitions[hog_part].p_size = 0;
1325		} else {
1326			lp->d_partitions[hog_part].p_size = current_offset -
1327			    base_offset - needed;
1328			total_size += lp->d_partitions[hog_part].p_size;
1329		}
1330	}
1331
1332	/* Now set the offsets for each partition */
1333	current_offset = BBSIZE / secsize; /* in sectors */
1334	seen_default_offset = 0;
1335	for (i = 0; i < lp->d_npartitions; i++) {
1336		part = 'a' + i;
1337		pp = &lp->d_partitions[i];
1338		if (part_set[i]) {
1339			if (part_offset_type[i] == '*') {
1340				if (i == RAW_PART) {
1341					pp->p_offset = 0;
1342				} else {
1343					pp->p_offset = current_offset;
1344					seen_default_offset = 1;
1345				}
1346			} else {
1347				/* allow them to be out of order for old-style tables */
1348				if (pp->p_offset < current_offset &&
1349				    seen_default_offset && i != RAW_PART &&
1350				    pp->p_fstype != FS_VINUM) {
1351					fprintf(stderr,
1352"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1353					    (long)pp->p_offset,i+'a',current_offset);
1354					fprintf(stderr,
1355"Labels with any *'s for offset must be in ascending order by sector\n");
1356					errors++;
1357				} else if (pp->p_offset != current_offset &&
1358				    i != RAW_PART && seen_default_offset) {
1359					/*
1360					 * this may give unneeded warnings if
1361					 * partitions are out-of-order
1362					 */
1363					warnx(
1364"Offset %ld for partition %c doesn't match expected value %ld",
1365					    (long)pp->p_offset, i + 'a', current_offset);
1366				}
1367			}
1368			if (i != RAW_PART)
1369				current_offset = pp->p_offset + pp->p_size;
1370		}
1371	}
1372
1373	for (i = 0; i < lp->d_npartitions; i++) {
1374		part = 'a' + i;
1375		pp = &lp->d_partitions[i];
1376		if (pp->p_size == 0 && pp->p_offset != 0)
1377			warnx("partition %c: size 0, but offset %lu",
1378			    part, (u_long)pp->p_offset);
1379#ifdef notdef
1380		if (pp->p_size % lp->d_secpercyl)
1381			warnx("partition %c: size %% cylinder-size != 0",
1382			    part);
1383		if (pp->p_offset % lp->d_secpercyl)
1384			warnx("partition %c: offset %% cylinder-size != 0",
1385			    part);
1386#endif
1387		if (pp->p_offset > lp->d_secperunit) {
1388			fprintf(stderr,
1389			    "partition %c: offset past end of unit\n", part);
1390			errors++;
1391		}
1392		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1393			fprintf(stderr,
1394			"partition %c: partition extends past end of unit\n",
1395			    part);
1396			errors++;
1397		}
1398		if (i == RAW_PART) {
1399			if (pp->p_fstype != FS_UNUSED)
1400				warnx("partition %c is not marked as unused!",part);
1401			if (pp->p_offset != 0)
1402				warnx("partition %c doesn't start at 0!",part);
1403			if (pp->p_size != lp->d_secperunit)
1404				warnx("partition %c doesn't cover the whole unit!",part);
1405
1406			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1407			    (pp->p_size != lp->d_secperunit)) {
1408				warnx("An incorrect partition %c may cause problems for "
1409				    "standard system utilities",part);
1410			}
1411		}
1412
1413		/* check for overlaps */
1414		/* this will check for all possible overlaps once and only once */
1415		for (j = 0; j < i; j++) {
1416			pp2 = &lp->d_partitions[j];
1417			if (j != RAW_PART && i != RAW_PART &&
1418			    pp->p_fstype != FS_VINUM &&
1419			    pp2->p_fstype != FS_VINUM &&
1420			    part_set[i] && part_set[j]) {
1421				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1422				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1423					pp2->p_offset >= pp->p_offset)) {
1424					fprintf(stderr,"partitions %c and %c overlap!\n",
1425					    j + 'a', i + 'a');
1426					errors++;
1427				}
1428			}
1429		}
1430	}
1431	for (; i < lp->d_npartitions; i++) {
1432		part = 'a' + i;
1433		pp = &lp->d_partitions[i];
1434		if (pp->p_size || pp->p_offset)
1435			warnx("unused partition %c: size %d offset %lu",
1436			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1437	}
1438	return (errors);
1439}
1440
1441/*
1442 * When operating on a "virgin" disk, try getting an initial label
1443 * from the associated device driver.  This might work for all device
1444 * drivers that are able to fetch some initial device parameters
1445 * without even having access to a (BSD) disklabel, like SCSI disks,
1446 * most IDE drives, or vn devices.
1447 *
1448 * The device name must be given in its "canonical" form.
1449 */
1450static struct disklabel *
1451getvirginlabel(void)
1452{
1453	static struct disklabel loclab;
1454	struct partition *dp;
1455	int f;
1456	u_int u;
1457
1458	if ((f = open(specname, O_RDONLY)) == -1) {
1459		warn("cannot open %s", specname);
1460		return (NULL);
1461	}
1462
1463	if (is_file)
1464		get_file_parms(f);
1465	else {
1466		mediasize = g_mediasize(f);
1467		secsize = g_sectorsize(f);
1468		if (secsize < 0 || mediasize < 0) {
1469			close (f);
1470			return (NULL);
1471		}
1472	}
1473	memset(&loclab, 0, sizeof loclab);
1474	loclab.d_magic = DISKMAGIC;
1475	loclab.d_magic2 = DISKMAGIC;
1476	loclab.d_secsize = secsize;
1477	loclab.d_secperunit = mediasize / secsize;
1478
1479	/*
1480	 * Nobody in these enligthened days uses the CHS geometry for
1481	 * anything, but nontheless try to get it right.  If we fail
1482	 * to get any good ideas from the device, construct something
1483	 * which is IBM-PC friendly.
1484	 */
1485	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1486		loclab.d_nsectors = u;
1487	else
1488		loclab.d_nsectors = 63;
1489	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1490		loclab.d_ntracks = u;
1491	else if (loclab.d_secperunit <= 63*1*1024)
1492		loclab.d_ntracks = 1;
1493	else if (loclab.d_secperunit <= 63*16*1024)
1494		loclab.d_ntracks = 16;
1495	else
1496		loclab.d_ntracks = 255;
1497	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1498	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1499	loclab.d_npartitions = DEFPARTITIONS;
1500
1501	/* Various (unneeded) compat stuff */
1502	loclab.d_rpm = 3600;
1503	loclab.d_bbsize = BBSIZE;
1504	loclab.d_interleave = 1;
1505	strncpy(loclab.d_typename, "amnesiac",
1506	    sizeof(loclab.d_typename));
1507
1508	dp = &loclab.d_partitions[RAW_PART];
1509	dp->p_size = loclab.d_secperunit;
1510	loclab.d_checksum = dkcksum(&loclab);
1511	close (f);
1512	return (&loclab);
1513}
1514
1515static void
1516usage(void)
1517{
1518
1519	fprintf(stderr,
1520	"%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",
1521	"usage: bsdlabel disk",
1522	"\t\t(to read label)",
1523	"	bsdlabel -w [-n] [-m machine] disk [type]",
1524	"\t\t(to write label with existing boot program)",
1525	"	bsdlabel -e [-n] [-m machine] disk",
1526	"\t\t(to edit label)",
1527	"	bsdlabel -R [-n] [-m machine] disk protofile",
1528	"\t\t(to restore label with existing boot program)",
1529	"	bsdlabel -B [-b boot] [-m machine] disk",
1530	"\t\t(to install boot program with existing on-disk label)",
1531	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1532	"\t\t(to write label and install boot program)",
1533	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1534		"\t\t(to restore label and install boot program)"
1535	);
1536	exit(1);
1537}
1538