bsdlabel.c revision 211342 
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 211342 2010-08-15 17:49:41Z jh $");
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 uint32_t lba_offset;
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;
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		if (read(fd, bootarea + 512, st.st_size) != st.st_size)
362			err(1, "read error %s", xxboot);
363
364		/*
365		 * Set the location and length so SRM can find the
366		 * boot blocks.
367		 */
368		p = (uint64_t *)bootarea;
369		p[60] = (st.st_size + secsize - 1) / secsize;
370		p[61] = 1;
371		p[62] = 0;
372		return;
373	} else if ((!alphacksum) && st.st_size <= BBSIZE) {
374		if (read(fd, bootarea, st.st_size) != st.st_size)
375			err(1, "read error %s", xxboot);
376		return;
377	}
378	errx(1, "boot code %s is wrong size", xxboot);
379}
380
381static int
382writelabel(void)
383{
384	uint64_t *p, sum;
385	int i, fd;
386	struct gctl_req *grq;
387	char const *errstr;
388	struct disklabel *lp = &lab;
389
390	if (disable_write) {
391		warnx("write to disk label supressed - label was as follows:");
392		display(stdout, NULL);
393		return (0);
394	}
395
396	lp->d_magic = DISKMAGIC;
397	lp->d_magic2 = DISKMAGIC;
398	lp->d_checksum = 0;
399	lp->d_checksum = dkcksum(lp);
400	if (installboot)
401		readboot();
402	for (i = 0; i < lab.d_npartitions; i++)
403		if (lab.d_partitions[i].p_size)
404			lab.d_partitions[i].p_offset += lba_offset;
405	bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
406	    lp);
407	if (alphacksum) {
408		/* Generate the bootblock checksum for the SRM console.  */
409		for (p = (uint64_t *)bootarea, i = 0, sum = 0; i < 63; i++)
410			sum += p[i];
411		p[63] = sum;
412	}
413
414	fd = open(specname, O_RDWR);
415	if (fd < 0) {
416		if (is_file) {
417			warn("cannot open file %s for writing label", specname);
418			return(1);
419		}
420
421		grq = gctl_get_handle();
422		gctl_ro_param(grq, "verb", -1, "write label");
423		gctl_ro_param(grq, "class", -1, "BSD");
424		gctl_ro_param(grq, "geom", -1, pname);
425		gctl_ro_param(grq, "label", 148+16*8,
426			bootarea + labeloffset + labelsoffset * secsize);
427		errstr = gctl_issue(grq);
428		if (errstr != NULL) {
429			warnx("%s", errstr);
430			gctl_free(grq);
431			return(1);
432		}
433		gctl_free(grq);
434		if (installboot) {
435			grq = gctl_get_handle();
436			gctl_ro_param(grq, "verb", -1, "write bootcode");
437			gctl_ro_param(grq, "class", -1, "BSD");
438			gctl_ro_param(grq, "geom", -1, pname);
439			gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
440			errstr = gctl_issue(grq);
441			if (errstr != NULL) {
442				warnx("%s", errstr);
443				gctl_free(grq);
444				return (1);
445			}
446			gctl_free(grq);
447		}
448	} else {
449		if (write(fd, bootarea, bbsize) != bbsize) {
450			warn("write %s", specname);
451			close (fd);
452			return (1);
453		}
454		close (fd);
455	}
456	return (0);
457}
458
459static void
460get_file_parms(int f)
461{
462	int i;
463	struct stat sb;
464
465	if (fstat(f, &sb) != 0)
466		err(4, "fstat failed");
467	i = sb.st_mode & S_IFMT;
468	if (i != S_IFREG && i != S_IFLNK)
469		errx(4, "%s is not a valid file or link", specname);
470	secsize = DEV_BSIZE;
471	mediasize = sb.st_size;
472}
473
474/*
475 * Fetch disklabel for disk.
476 */
477static int
478readlabel(int flag)
479{
480	ssize_t nbytes;
481	uint32_t lba;
482	int f, i;
483	int error;
484
485	f = open(specname, O_RDONLY);
486	if (f < 0)
487		err(1, specname);
488	if (is_file)
489		get_file_parms(f);
490	else {
491		mediasize = g_mediasize(f);
492		secsize = g_sectorsize(f);
493		if (secsize < 0 || mediasize < 0)
494			err(4, "cannot get disk geometry");
495	}
496	if (mediasize > (off_t)0xffffffff * secsize)
497		errx(1,
498		    "disks with more than 2^32-1 sectors are not supported");
499	(void)lseek(f, (off_t)0, SEEK_SET);
500	nbytes = read(f, bootarea, BBSIZE);
501	if (nbytes == -1)
502		err(4, "%s read", specname);
503	if (nbytes != BBSIZE)
504		errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
505	close (f);
506	error = bsd_disklabel_le_dec(
507	    bootarea + (labeloffset + labelsoffset * secsize),
508	    &lab, MAXPARTITIONS);
509	if (flag && error)
510		errx(1, "%s: no valid label found", specname);
511
512	if (is_file)
513		return(0);
514
515	/*
516	 * Compensate for absolute block addressing by finding the
517	 * smallest partition offset and if the offset of the 'c'
518	 * partition is equal to that, subtract it from all offsets.
519	 */
520	lba = ~0;
521	for (i = 0; i < lab.d_npartitions; i++) {
522		if (lab.d_partitions[i].p_size)
523			lba = MIN(lba, lab.d_partitions[i].p_offset);
524	}
525	if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
526		for (i = 0; i < lab.d_npartitions; i++) {
527			if (lab.d_partitions[i].p_size)
528				lab.d_partitions[i].p_offset -= lba;
529		}
530		/*
531		 * Save the offset so that we can write the label
532		 * back with absolute block addresses.
533		 */
534		lba_offset = lba;
535	}
536	return (error);
537}
538
539
540static void
541display(FILE *f, const struct disklabel *lp)
542{
543	int i, j;
544	const struct partition *pp;
545
546	if (lp == NULL)
547		lp = &lab;
548
549	fprintf(f, "# %s:\n", specname);
550	if (allfields) {
551		if (lp->d_type < DKMAXTYPES)
552			fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
553		else
554			fprintf(f, "type: %u\n", lp->d_type);
555		fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
556			lp->d_typename);
557		fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
558			lp->d_packname);
559		fprintf(f, "flags:");
560		if (lp->d_flags & D_REMOVABLE)
561			fprintf(f, " removeable");
562		if (lp->d_flags & D_ECC)
563			fprintf(f, " ecc");
564		if (lp->d_flags & D_BADSECT)
565			fprintf(f, " badsect");
566		fprintf(f, "\n");
567		fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
568		fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
569		fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
570		fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
571		fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
572		fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
573		fprintf(f, "rpm: %u\n", lp->d_rpm);
574		fprintf(f, "interleave: %u\n", lp->d_interleave);
575		fprintf(f, "trackskew: %u\n", lp->d_trackskew);
576		fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
577		fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
578		    (u_long)lp->d_headswitch);
579		fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
580		    (u_long)lp->d_trkseek);
581		fprintf(f, "drivedata: ");
582		for (i = NDDATA - 1; i >= 0; i--)
583			if (lp->d_drivedata[i])
584				break;
585		if (i < 0)
586			i = 0;
587		for (j = 0; j <= i; j++)
588			fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
589		fprintf(f, "\n\n");
590	}
591	fprintf(f, "%u partitions:\n", lp->d_npartitions);
592	fprintf(f,
593	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
594	pp = lp->d_partitions;
595	for (i = 0; i < lp->d_npartitions; i++, pp++) {
596		if (pp->p_size) {
597			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
598			   (u_long)pp->p_size, (u_long)pp->p_offset);
599			if (pp->p_fstype < FSMAXTYPES)
600				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
601			else
602				fprintf(f, "%8d", pp->p_fstype);
603			switch (pp->p_fstype) {
604
605			case FS_UNUSED:				/* XXX */
606				fprintf(f, "    %5lu %5lu %5.5s ",
607				    (u_long)pp->p_fsize,
608				    (u_long)(pp->p_fsize * pp->p_frag), "");
609				break;
610
611			case FS_BSDFFS:
612				fprintf(f, "    %5lu %5lu %5u ",
613				    (u_long)pp->p_fsize,
614				    (u_long)(pp->p_fsize * pp->p_frag),
615				    pp->p_cpg);
616				break;
617
618			case FS_BSDLFS:
619				fprintf(f, "    %5lu %5lu %5d",
620				    (u_long)pp->p_fsize,
621				    (u_long)(pp->p_fsize * pp->p_frag),
622				    pp->p_cpg);
623				break;
624
625			default:
626				fprintf(f, "%20.20s", "");
627				break;
628			}
629			if (i == RAW_PART) {
630				fprintf(f, "  # \"raw\" part, don't edit");
631			}
632			fprintf(f, "\n");
633		}
634	}
635	fflush(f);
636}
637
638static int
639edit(void)
640{
641	int c, fd;
642	struct disklabel label;
643	FILE *fp;
644
645	if ((fd = mkstemp(tmpfil)) == -1 ||
646	    (fp = fdopen(fd, "w")) == NULL) {
647		warnx("can't create %s", tmpfil);
648		return (1);
649	}
650	display(fp, NULL);
651	fclose(fp);
652	for (;;) {
653		if (!editit())
654			break;
655		fp = fopen(tmpfil, "r");
656		if (fp == NULL) {
657			warnx("can't reopen %s for reading", tmpfil);
658			break;
659		}
660		bzero((char *)&label, sizeof(label));
661		c = getasciilabel(fp, &label);
662		fclose(fp);
663		if (c) {
664			lab = label;
665			if (writelabel() == 0) {
666				(void) unlink(tmpfil);
667				return (0);
668			}
669		}
670		printf("re-edit the label? [y]: ");
671		fflush(stdout);
672		c = getchar();
673		if (c != EOF && c != (int)'\n')
674			while (getchar() != (int)'\n')
675				;
676		if  (c == (int)'n')
677			break;
678	}
679	(void) unlink(tmpfil);
680	return (1);
681}
682
683static int
684editit(void)
685{
686	int pid, xpid;
687	int locstat, omask;
688	const char *ed;
689	uid_t uid;
690	gid_t gid;
691
692	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
693	while ((pid = fork()) < 0) {
694		if (errno == EPROCLIM) {
695			warnx("you have too many processes");
696			return(0);
697		}
698		if (errno != EAGAIN) {
699			warn("fork");
700			return(0);
701		}
702		sleep(1);
703	}
704	if (pid == 0) {
705		sigsetmask(omask);
706		gid = getgid();
707		if (setresgid(gid, gid, gid) == -1)
708			err(1, "setresgid");
709		uid = getuid();
710		if (setresuid(uid, uid, uid) == -1)
711			err(1, "setresuid");
712		if ((ed = getenv("EDITOR")) == (char *)0)
713			ed = DEFEDITOR;
714		execlp(ed, ed, tmpfil, (char *)0);
715		err(1, "%s", ed);
716	}
717	while ((xpid = wait(&locstat)) >= 0)
718		if (xpid == pid)
719			break;
720	sigsetmask(omask);
721	return(!locstat);
722}
723
724static char *
725skip(char *cp)
726{
727
728	while (*cp != '\0' && isspace(*cp))
729		cp++;
730	if (*cp == '\0' || *cp == '#')
731		return (NULL);
732	return (cp);
733}
734
735static char *
736word(char *cp)
737{
738	char c;
739
740	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
741		cp++;
742	if ((c = *cp) != '\0') {
743		*cp++ = '\0';
744		if (c != '#')
745			return (skip(cp));
746	}
747	return (NULL);
748}
749
750/*
751 * Read an ascii label in from fd f,
752 * in the same format as that put out by display(),
753 * and fill in lp.
754 */
755static int
756getasciilabel(FILE *f, struct disklabel *lp)
757{
758	char *cp, *endp;
759	const char **cpp;
760	u_int part;
761	char *tp, line[BUFSIZ];
762	u_long v;
763	int lineno = 0, errors = 0;
764	int i;
765
766	makelabel("auto", lp);
767	bzero(&part_set, sizeof(part_set));
768	bzero(&part_size_type, sizeof(part_size_type));
769	bzero(&part_offset_type, sizeof(part_offset_type));
770	lp->d_bbsize = BBSIZE;				/* XXX */
771	lp->d_sbsize = 0;				/* XXX */
772	while (fgets(line, sizeof(line) - 1, f)) {
773		lineno++;
774		if ((cp = index(line,'\n')) != 0)
775			*cp = '\0';
776		cp = skip(line);
777		if (cp == NULL)
778			continue;
779		tp = index(cp, ':');
780		if (tp == NULL) {
781			fprintf(stderr, "line %d: syntax error\n", lineno);
782			errors++;
783			continue;
784		}
785		*tp++ = '\0', tp = skip(tp);
786		if (!strcmp(cp, "type")) {
787			if (tp == NULL)
788				tp = unknown;
789			cpp = dktypenames;
790			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
791				if (*cpp && !strcmp(*cpp, tp)) {
792					lp->d_type = cpp - dktypenames;
793					break;
794				}
795			if (cpp < &dktypenames[DKMAXTYPES])
796				continue;
797			errno = 0;
798			v = strtoul(tp, &endp, 10);
799			if (errno != 0 || *endp != '\0')
800				v = DKMAXTYPES;
801			if (v >= DKMAXTYPES)
802				fprintf(stderr, "line %d:%s %lu\n", lineno,
803				    "Warning, unknown disk type", v);
804			else
805				lp->d_type = v;
806			continue;
807		}
808		if (!strcmp(cp, "flags")) {
809			for (v = 0; (cp = tp) && *cp != '\0';) {
810				tp = word(cp);
811				if (!strcmp(cp, "removeable"))
812					v |= D_REMOVABLE;
813				else if (!strcmp(cp, "ecc"))
814					v |= D_ECC;
815				else if (!strcmp(cp, "badsect"))
816					v |= D_BADSECT;
817				else {
818					fprintf(stderr,
819					    "line %d: %s: bad flag\n",
820					    lineno, cp);
821					errors++;
822				}
823			}
824			lp->d_flags = v;
825			continue;
826		}
827		if (!strcmp(cp, "drivedata")) {
828			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
829				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
830				tp = word(cp);
831			}
832			continue;
833		}
834		if (sscanf(cp, "%lu partitions", &v) == 1) {
835			if (v == 0 || v > MAXPARTITIONS) {
836				fprintf(stderr,
837				    "line %d: bad # of partitions\n", lineno);
838				lp->d_npartitions = MAXPARTITIONS;
839				errors++;
840			} else
841				lp->d_npartitions = v;
842			continue;
843		}
844		if (tp == NULL)
845			tp = blank;
846		if (!strcmp(cp, "disk")) {
847			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
848			continue;
849		}
850		if (!strcmp(cp, "label")) {
851			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
852			continue;
853		}
854		if (!strcmp(cp, "bytes/sector")) {
855			v = strtoul(tp, NULL, 10);
856			if (v == 0 || (v % DEV_BSIZE) != 0) {
857				fprintf(stderr,
858				    "line %d: %s: bad sector size\n",
859				    lineno, tp);
860				errors++;
861			} else
862				lp->d_secsize = v;
863			continue;
864		}
865		if (!strcmp(cp, "sectors/track")) {
866			v = strtoul(tp, NULL, 10);
867#if (ULONG_MAX != 0xffffffffUL)
868			if (v == 0 || v > 0xffffffff)
869#else
870			if (v == 0)
871#endif
872			{
873				fprintf(stderr, "line %d: %s: bad %s\n",
874				    lineno, tp, cp);
875				errors++;
876			} else
877				lp->d_nsectors = v;
878			continue;
879		}
880		if (!strcmp(cp, "sectors/cylinder")) {
881			v = strtoul(tp, NULL, 10);
882			if (v == 0) {
883				fprintf(stderr, "line %d: %s: bad %s\n",
884				    lineno, tp, cp);
885				errors++;
886			} else
887				lp->d_secpercyl = v;
888			continue;
889		}
890		if (!strcmp(cp, "tracks/cylinder")) {
891			v = strtoul(tp, NULL, 10);
892			if (v == 0) {
893				fprintf(stderr, "line %d: %s: bad %s\n",
894				    lineno, tp, cp);
895				errors++;
896			} else
897				lp->d_ntracks = v;
898			continue;
899		}
900		if (!strcmp(cp, "cylinders")) {
901			v = strtoul(tp, NULL, 10);
902			if (v == 0) {
903				fprintf(stderr, "line %d: %s: bad %s\n",
904				    lineno, tp, cp);
905				errors++;
906			} else
907				lp->d_ncylinders = v;
908			continue;
909		}
910		if (!strcmp(cp, "sectors/unit")) {
911			v = strtoul(tp, NULL, 10);
912			if (v == 0) {
913				fprintf(stderr, "line %d: %s: bad %s\n",
914				    lineno, tp, cp);
915				errors++;
916			} else
917				lp->d_secperunit = v;
918			continue;
919		}
920		if (!strcmp(cp, "rpm")) {
921			v = strtoul(tp, NULL, 10);
922			if (v == 0 || v > USHRT_MAX) {
923				fprintf(stderr, "line %d: %s: bad %s\n",
924				    lineno, tp, cp);
925				errors++;
926			} else
927				lp->d_rpm = v;
928			continue;
929		}
930		if (!strcmp(cp, "interleave")) {
931			v = strtoul(tp, NULL, 10);
932			if (v == 0 || v > USHRT_MAX) {
933				fprintf(stderr, "line %d: %s: bad %s\n",
934				    lineno, tp, cp);
935				errors++;
936			} else
937				lp->d_interleave = v;
938			continue;
939		}
940		if (!strcmp(cp, "trackskew")) {
941			v = strtoul(tp, NULL, 10);
942			if (v > USHRT_MAX) {
943				fprintf(stderr, "line %d: %s: bad %s\n",
944				    lineno, tp, cp);
945				errors++;
946			} else
947				lp->d_trackskew = v;
948			continue;
949		}
950		if (!strcmp(cp, "cylinderskew")) {
951			v = strtoul(tp, NULL, 10);
952			if (v > USHRT_MAX) {
953				fprintf(stderr, "line %d: %s: bad %s\n",
954				    lineno, tp, cp);
955				errors++;
956			} else
957				lp->d_cylskew = v;
958			continue;
959		}
960		if (!strcmp(cp, "headswitch")) {
961			v = strtoul(tp, NULL, 10);
962			lp->d_headswitch = v;
963			continue;
964		}
965		if (!strcmp(cp, "track-to-track seek")) {
966			v = strtoul(tp, NULL, 10);
967			lp->d_trkseek = v;
968			continue;
969		}
970		/* the ':' was removed above */
971		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
972			fprintf(stderr,
973			    "line %d: %s: Unknown disklabel field\n", lineno,
974			    cp);
975			errors++;
976			continue;
977		}
978
979		/* Process a partition specification line. */
980		part = *cp - 'a';
981		if (part >= lp->d_npartitions) {
982			fprintf(stderr,
983			    "line %d: partition name out of range a-%c: %s\n",
984			    lineno, 'a' + lp->d_npartitions - 1, cp);
985			errors++;
986			continue;
987		}
988		part_set[part] = 1;
989
990		if (getasciipartspec(tp, lp, part, lineno) != 0) {
991			errors++;
992			break;
993		}
994	}
995	errors += checklabel(lp);
996	return (errors == 0);
997}
998
999#define NXTNUM(n) do { \
1000	if (tp == NULL) { \
1001		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1002		return (1); \
1003	} else { \
1004		cp = tp, tp = word(cp); \
1005		(n) = strtoul(cp, NULL, 10); \
1006	} \
1007} while (0)
1008
1009/* retain 1 character following number */
1010#define NXTWORD(w,n) do { \
1011	if (tp == NULL) { \
1012		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1013		return (1); \
1014	} else { \
1015		char *tmp; \
1016		cp = tp, tp = word(cp); \
1017		(n) = strtoul(cp, &tmp, 10); \
1018		if (tmp) (w) = *tmp; \
1019	} \
1020} while (0)
1021
1022/*
1023 * Read a partition line into partition `part' in the specified disklabel.
1024 * Return 0 on success, 1 on failure.
1025 */
1026static int
1027getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1028{
1029	struct partition *pp;
1030	char *cp, *endp;
1031	const char **cpp;
1032	u_long v;
1033
1034	pp = &lp->d_partitions[part];
1035	cp = NULL;
1036
1037	v = 0;
1038	NXTWORD(part_size_type[part],v);
1039	if (v == 0 && part_size_type[part] != '*') {
1040		fprintf(stderr,
1041		    "line %d: %s: bad partition size\n", lineno, cp);
1042		return (1);
1043	}
1044	pp->p_size = v;
1045
1046	v = 0;
1047	NXTWORD(part_offset_type[part],v);
1048	if (v == 0 && part_offset_type[part] != '*' &&
1049	    part_offset_type[part] != '\0') {
1050		fprintf(stderr,
1051		    "line %d: %s: bad partition offset\n", lineno, cp);
1052		return (1);
1053	}
1054	pp->p_offset = v;
1055	if (tp == NULL) {
1056		fprintf(stderr, "line %d: missing file system type\n", lineno);
1057		return (1);
1058	}
1059	cp = tp, tp = word(cp);
1060	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1061		if (*cpp && !strcmp(*cpp, cp))
1062			break;
1063	if (*cpp != NULL) {
1064		pp->p_fstype = cpp - fstypenames;
1065	} else {
1066		if (isdigit(*cp)) {
1067			errno = 0;
1068			v = strtoul(cp, &endp, 10);
1069			if (errno != 0 || *endp != '\0')
1070				v = FSMAXTYPES;
1071		} else
1072			v = FSMAXTYPES;
1073		if (v >= FSMAXTYPES) {
1074			fprintf(stderr,
1075			    "line %d: Warning, unknown file system type %s\n",
1076			    lineno, cp);
1077			v = FS_UNUSED;
1078		}
1079		pp->p_fstype = v;
1080	}
1081
1082	switch (pp->p_fstype) {
1083	case FS_UNUSED:
1084	case FS_BSDFFS:
1085	case FS_BSDLFS:
1086		/* accept defaults for fsize/frag/cpg */
1087		if (tp) {
1088			NXTNUM(pp->p_fsize);
1089			if (pp->p_fsize == 0)
1090				break;
1091			NXTNUM(v);
1092			pp->p_frag = v / pp->p_fsize;
1093			if (tp != NULL)
1094				NXTNUM(pp->p_cpg);
1095		}
1096		/* else default to 0's */
1097		break;
1098	default:
1099		break;
1100	}
1101	return (0);
1102}
1103
1104/*
1105 * Check disklabel for errors and fill in
1106 * derived fields according to supplied values.
1107 */
1108static int
1109checklabel(struct disklabel *lp)
1110{
1111	struct partition *pp;
1112	int i, errors = 0;
1113	char part;
1114	u_long base_offset, needed, total_size, total_percent, current_offset;
1115	long free_space;
1116	int seen_default_offset;
1117	int hog_part;
1118	int j;
1119	struct partition *pp2;
1120
1121	if (lp == NULL)
1122		lp = &lab;
1123
1124	if (allfields) {
1125
1126		if (lp->d_secsize == 0) {
1127			fprintf(stderr, "sector size 0\n");
1128			return (1);
1129		}
1130		if (lp->d_nsectors == 0) {
1131			fprintf(stderr, "sectors/track 0\n");
1132			return (1);
1133		}
1134		if (lp->d_ntracks == 0) {
1135			fprintf(stderr, "tracks/cylinder 0\n");
1136			return (1);
1137		}
1138		if  (lp->d_ncylinders == 0) {
1139			fprintf(stderr, "cylinders/unit 0\n");
1140			errors++;
1141		}
1142		if (lp->d_rpm == 0)
1143			warnx("revolutions/minute 0");
1144		if (lp->d_secpercyl == 0)
1145			lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1146		if (lp->d_secperunit == 0)
1147			lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1148		if (lp->d_bbsize == 0) {
1149			fprintf(stderr, "boot block size 0\n");
1150			errors++;
1151		} else if (lp->d_bbsize % lp->d_secsize)
1152			warnx("boot block size %% sector-size != 0");
1153		if (lp->d_npartitions > MAXPARTITIONS)
1154			warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1155			    (u_long)lp->d_npartitions, MAXPARTITIONS);
1156	} else {
1157		struct disklabel *vl;
1158
1159		vl = getvirginlabel();
1160		lp->d_secsize = vl->d_secsize;
1161		lp->d_nsectors = vl->d_nsectors;
1162		lp->d_ntracks = vl->d_ntracks;
1163		lp->d_ncylinders = vl->d_ncylinders;
1164		lp->d_rpm = vl->d_rpm;
1165		lp->d_interleave = vl->d_interleave;
1166		lp->d_secpercyl = vl->d_secpercyl;
1167		lp->d_secperunit = vl->d_secperunit;
1168		lp->d_bbsize = vl->d_bbsize;
1169		lp->d_npartitions = vl->d_npartitions;
1170	}
1171
1172
1173	/* first allocate space to the partitions, then offsets */
1174	total_size = 0; /* in sectors */
1175	total_percent = 0; /* in percent */
1176	hog_part = -1;
1177	/* find all fixed partitions */
1178	for (i = 0; i < lp->d_npartitions; i++) {
1179		pp = &lp->d_partitions[i];
1180		if (part_set[i]) {
1181			if (part_size_type[i] == '*') {
1182				if (i == RAW_PART) {
1183					pp->p_size = lp->d_secperunit;
1184				} else {
1185					if (hog_part != -1)
1186						warnx("Too many '*' partitions (%c and %c)",
1187						    hog_part + 'a',i + 'a');
1188					else
1189						hog_part = i;
1190				}
1191			} else {
1192				off_t size;
1193
1194				size = pp->p_size;
1195				switch (part_size_type[i]) {
1196				case '%':
1197					total_percent += size;
1198					break;
1199				case 't':
1200				case 'T':
1201					size *= 1024ULL;
1202					/* FALLTHROUGH */
1203				case 'g':
1204				case 'G':
1205					size *= 1024ULL;
1206					/* FALLTHROUGH */
1207				case 'm':
1208				case 'M':
1209					size *= 1024ULL;
1210					/* FALLTHROUGH */
1211				case 'k':
1212				case 'K':
1213					size *= 1024ULL;
1214					break;
1215				case '\0':
1216					break;
1217				default:
1218					warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1219					    part_size_type[i], i + 'a');
1220					break;
1221				}
1222				/* don't count %'s yet */
1223				if (part_size_type[i] != '%') {
1224					/*
1225					 * for all not in sectors, convert to
1226					 * sectors
1227					 */
1228					if (part_size_type[i] != '\0') {
1229						if (size % lp->d_secsize != 0)
1230							warnx("partition %c not an integer number of sectors",
1231							    i + 'a');
1232						size /= lp->d_secsize;
1233						pp->p_size = size;
1234					}
1235					/* else already in sectors */
1236					if (i != RAW_PART)
1237						total_size += size;
1238				}
1239			}
1240		}
1241	}
1242
1243	/* Find out the total free space, excluding the boot block area. */
1244	base_offset = BBSIZE / secsize;
1245	free_space = 0;
1246	for (i = 0; i < lp->d_npartitions; i++) {
1247		pp = &lp->d_partitions[i];
1248		if (!part_set[i] || i == RAW_PART ||
1249		    part_size_type[i] == '%' || part_size_type[i] == '*')
1250			continue;
1251		if (pp->p_offset > base_offset)
1252			free_space += pp->p_offset - base_offset;
1253		if (pp->p_offset + pp->p_size > base_offset)
1254			base_offset = pp->p_offset + pp->p_size;
1255	}
1256	if (base_offset < lp->d_secperunit)
1257		free_space += lp->d_secperunit - base_offset;
1258
1259	/* handle % partitions - note %'s don't need to add up to 100! */
1260	if (total_percent != 0) {
1261		if (total_percent > 100) {
1262			fprintf(stderr,"total percentage %lu is greater than 100\n",
1263			    total_percent);
1264			errors++;
1265		}
1266
1267		if (free_space > 0) {
1268			for (i = 0; i < lp->d_npartitions; i++) {
1269				pp = &lp->d_partitions[i];
1270				if (part_set[i] && part_size_type[i] == '%') {
1271					/* careful of overflows! and integer roundoff */
1272					pp->p_size = ((double)pp->p_size/100) * free_space;
1273					total_size += pp->p_size;
1274
1275					/* FIX we can lose a sector or so due to roundoff per
1276					   partition.  A more complex algorithm could avoid that */
1277				}
1278			}
1279		} else {
1280			fprintf(stderr,
1281			    "%ld sectors available to give to '*' and '%%' partitions\n",
1282			    free_space);
1283			errors++;
1284			/* fix?  set all % partitions to size 0? */
1285		}
1286	}
1287	/* give anything remaining to the hog partition */
1288	if (hog_part != -1) {
1289		/*
1290		 * Find the range of offsets usable by '*' partitions around
1291		 * the hog partition and how much space they need.
1292		 */
1293		needed = 0;
1294		base_offset = BBSIZE / secsize;
1295		for (i = hog_part - 1; i >= 0; i--) {
1296			pp = &lp->d_partitions[i];
1297			if (!part_set[i] || i == RAW_PART)
1298				continue;
1299			if (part_offset_type[i] == '*') {
1300				needed += pp->p_size;
1301				continue;
1302			}
1303			base_offset = pp->p_offset + pp->p_size;
1304			break;
1305		}
1306		current_offset = lp->d_secperunit;
1307		for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1308			pp = &lp->d_partitions[i];
1309			if (!part_set[i] || i == RAW_PART)
1310				continue;
1311			if (part_offset_type[i] == '*') {
1312				needed += pp->p_size;
1313				continue;
1314			}
1315			current_offset = pp->p_offset;
1316		}
1317
1318		if (current_offset - base_offset <= needed) {
1319			fprintf(stderr, "Cannot find space for partition %c\n",
1320			    hog_part + 'a');
1321			fprintf(stderr,
1322			    "Need more than %lu sectors between %lu and %lu\n",
1323			    needed, base_offset, current_offset);
1324			errors++;
1325			lp->d_partitions[hog_part].p_size = 0;
1326		} else {
1327			lp->d_partitions[hog_part].p_size = current_offset -
1328			    base_offset - needed;
1329			total_size += lp->d_partitions[hog_part].p_size;
1330		}
1331	}
1332
1333	/* Now set the offsets for each partition */
1334	current_offset = BBSIZE / secsize; /* in sectors */
1335	seen_default_offset = 0;
1336	for (i = 0; i < lp->d_npartitions; i++) {
1337		part = 'a' + i;
1338		pp = &lp->d_partitions[i];
1339		if (part_set[i]) {
1340			if (part_offset_type[i] == '*') {
1341				if (i == RAW_PART) {
1342					pp->p_offset = 0;
1343				} else {
1344					pp->p_offset = current_offset;
1345					seen_default_offset = 1;
1346				}
1347			} else {
1348				/* allow them to be out of order for old-style tables */
1349				if (pp->p_offset < current_offset &&
1350				    seen_default_offset && i != RAW_PART &&
1351				    pp->p_fstype != FS_VINUM) {
1352					fprintf(stderr,
1353"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1354					    (long)pp->p_offset,i+'a',current_offset);
1355					fprintf(stderr,
1356"Labels with any *'s for offset must be in ascending order by sector\n");
1357					errors++;
1358				} else if (pp->p_offset != current_offset &&
1359				    i != RAW_PART && seen_default_offset) {
1360					/*
1361					 * this may give unneeded warnings if
1362					 * partitions are out-of-order
1363					 */
1364					warnx(
1365"Offset %ld for partition %c doesn't match expected value %ld",
1366					    (long)pp->p_offset, i + 'a', current_offset);
1367				}
1368			}
1369			if (i != RAW_PART)
1370				current_offset = pp->p_offset + pp->p_size;
1371		}
1372	}
1373
1374	for (i = 0; i < lp->d_npartitions; i++) {
1375		part = 'a' + i;
1376		pp = &lp->d_partitions[i];
1377		if (pp->p_size == 0 && pp->p_offset != 0)
1378			warnx("partition %c: size 0, but offset %lu",
1379			    part, (u_long)pp->p_offset);
1380#ifdef notdef
1381		if (pp->p_size % lp->d_secpercyl)
1382			warnx("partition %c: size %% cylinder-size != 0",
1383			    part);
1384		if (pp->p_offset % lp->d_secpercyl)
1385			warnx("partition %c: offset %% cylinder-size != 0",
1386			    part);
1387#endif
1388		if (pp->p_offset > lp->d_secperunit) {
1389			fprintf(stderr,
1390			    "partition %c: offset past end of unit\n", part);
1391			errors++;
1392		}
1393		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1394			fprintf(stderr,
1395			"partition %c: partition extends past end of unit\n",
1396			    part);
1397			errors++;
1398		}
1399		if (i == RAW_PART) {
1400			if (pp->p_fstype != FS_UNUSED)
1401				warnx("partition %c is not marked as unused!",part);
1402			if (pp->p_offset != 0)
1403				warnx("partition %c doesn't start at 0!",part);
1404			if (pp->p_size != lp->d_secperunit)
1405				warnx("partition %c doesn't cover the whole unit!",part);
1406
1407			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1408			    (pp->p_size != lp->d_secperunit)) {
1409				warnx("An incorrect partition %c may cause problems for "
1410				    "standard system utilities",part);
1411			}
1412		}
1413
1414		/* check for overlaps */
1415		/* this will check for all possible overlaps once and only once */
1416		for (j = 0; j < i; j++) {
1417			pp2 = &lp->d_partitions[j];
1418			if (j != RAW_PART && i != RAW_PART &&
1419			    pp->p_fstype != FS_VINUM &&
1420			    pp2->p_fstype != FS_VINUM &&
1421			    part_set[i] && part_set[j]) {
1422				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1423				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1424					pp2->p_offset >= pp->p_offset)) {
1425					fprintf(stderr,"partitions %c and %c overlap!\n",
1426					    j + 'a', i + 'a');
1427					errors++;
1428				}
1429			}
1430		}
1431	}
1432	for (; i < lp->d_npartitions; i++) {
1433		part = 'a' + i;
1434		pp = &lp->d_partitions[i];
1435		if (pp->p_size || pp->p_offset)
1436			warnx("unused partition %c: size %d offset %lu",
1437			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1438	}
1439	return (errors);
1440}
1441
1442/*
1443 * When operating on a "virgin" disk, try getting an initial label
1444 * from the associated device driver.  This might work for all device
1445 * drivers that are able to fetch some initial device parameters
1446 * without even having access to a (BSD) disklabel, like SCSI disks,
1447 * most IDE drives, or vn devices.
1448 *
1449 * The device name must be given in its "canonical" form.
1450 */
1451static struct disklabel *
1452getvirginlabel(void)
1453{
1454	static struct disklabel loclab;
1455	struct partition *dp;
1456	int f;
1457	u_int u;
1458
1459	if ((f = open(specname, O_RDONLY)) == -1) {
1460		warn("cannot open %s", specname);
1461		return (NULL);
1462	}
1463
1464	if (is_file)
1465		get_file_parms(f);
1466	else {
1467		mediasize = g_mediasize(f);
1468		secsize = g_sectorsize(f);
1469		if (secsize < 0 || mediasize < 0) {
1470			close (f);
1471			return (NULL);
1472		}
1473	}
1474	memset(&loclab, 0, sizeof loclab);
1475	loclab.d_magic = DISKMAGIC;
1476	loclab.d_magic2 = DISKMAGIC;
1477	loclab.d_secsize = secsize;
1478	loclab.d_secperunit = mediasize / secsize;
1479
1480	/*
1481	 * Nobody in these enligthened days uses the CHS geometry for
1482	 * anything, but nontheless try to get it right.  If we fail
1483	 * to get any good ideas from the device, construct something
1484	 * which is IBM-PC friendly.
1485	 */
1486	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1487		loclab.d_nsectors = u;
1488	else
1489		loclab.d_nsectors = 63;
1490	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1491		loclab.d_ntracks = u;
1492	else if (loclab.d_secperunit <= 63*1*1024)
1493		loclab.d_ntracks = 1;
1494	else if (loclab.d_secperunit <= 63*16*1024)
1495		loclab.d_ntracks = 16;
1496	else
1497		loclab.d_ntracks = 255;
1498	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1499	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1500	loclab.d_npartitions = DEFPARTITIONS;
1501
1502	/* Various (unneeded) compat stuff */
1503	loclab.d_rpm = 3600;
1504	loclab.d_bbsize = BBSIZE;
1505	loclab.d_interleave = 1;
1506	strncpy(loclab.d_typename, "amnesiac",
1507	    sizeof(loclab.d_typename));
1508
1509	dp = &loclab.d_partitions[RAW_PART];
1510	dp->p_size = loclab.d_secperunit;
1511	loclab.d_checksum = dkcksum(&loclab);
1512	close (f);
1513	return (&loclab);
1514}
1515
1516static void
1517usage(void)
1518{
1519
1520	fprintf(stderr,
1521	"%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",
1522	"usage: bsdlabel disk",
1523	"\t\t(to read label)",
1524	"	bsdlabel -w [-n] [-m machine] disk [type]",
1525	"\t\t(to write label with existing boot program)",
1526	"	bsdlabel -e [-n] [-m machine] disk",
1527	"\t\t(to edit label)",
1528	"	bsdlabel -R [-n] [-m machine] disk protofile",
1529	"\t\t(to restore label with existing boot program)",
1530	"	bsdlabel -B [-b boot] [-m machine] disk",
1531	"\t\t(to install boot program with existing on-disk label)",
1532	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1533	"\t\t(to write label and install boot program)",
1534	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1535		"\t\t(to restore label and install boot program)"
1536	);
1537	exit(1);
1538}
1539