bsdlabel.c revision 331722 
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: stable/11/sbin/bsdlabel/bsdlabel.c 331722 2018-03-29 02:50:57Z eadler $");
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	20
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_class_available(const char *);
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 ssize_t	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
133static enum {
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, "pc98")) {
169					labelsoffset = 1;
170					labeloffset = 0;
171					bbsize = 8192;
172				} else {
173					errx(1, "Unsupported architecture");
174				}
175				break;
176			case 'n':
177				disable_write = 1;
178				break;
179			case 'R':
180				if (op != UNSPEC)
181					usage();
182				op = RESTORE;
183				break;
184			case 'e':
185				if (op != UNSPEC)
186					usage();
187				op = EDIT;
188				break;
189			case 'r':
190				/*
191				 * We accept and ignore -r for compatibility with
192				 * historical disklabel usage.
193				 */
194				break;
195			case 'w':
196				if (op != UNSPEC)
197					usage();
198				op = WRITE;
199				break;
200			case '?':
201			default:
202				usage();
203		}
204	argc -= optind;
205	argv += optind;
206
207	if (argc < 1)
208		usage();
209	if (labelsoffset < 0 || labeloffset < 0)
210		errx(1, "a -m <architecture> option must be specified");
211
212	/* Figure out the names of the thing we're working on */
213	if (is_file) {
214		specname = argv[0];
215	} else {
216		specname = g_device_path(argv[0]);
217		if (specname == NULL) {
218			warn("unable to get correct path for %s", argv[0]);
219			return(1);
220		}
221		fd = open(specname, O_RDONLY);
222		if (fd < 0) {
223			warn("error opening %s", specname);
224			return(1);
225		}
226		pname = g_providername(fd);
227		if (pname == NULL) {
228			warn("error getting providername for %s", specname);
229			close(fd);
230			return(1);
231		}
232		close(fd);
233	}
234
235	if (installboot && op == UNSPEC)
236		op = WRITEBOOT;
237	else if (op == UNSPEC)
238		op = READ;
239
240	switch(op) {
241
242	case UNSPEC:
243		break;
244
245	case EDIT:
246		if (argc != 1)
247			usage();
248		readlabel(1);
249		fixlabel(&lab);
250		error = edit();
251		break;
252
253	case READ:
254		if (argc != 1)
255			usage();
256		readlabel(1);
257		display(stdout, NULL);
258		error = checklabel(NULL);
259		break;
260
261	case RESTORE:
262		if (argc != 2)
263			usage();
264		if (!(t = fopen(argv[1], "r")))
265			err(4, "fopen %s", argv[1]);
266		readlabel(0);
267		if (!getasciilabel(t, &lab))
268			exit(1);
269		error = writelabel();
270		break;
271
272	case WRITE:
273		if (argc == 2)
274			name = argv[1];
275		else if (argc == 1)
276			name = "auto";
277		else
278			usage();
279		readlabel(0);
280		makelabel(name, &lab);
281		fixlabel(&lab);
282		if (checklabel(NULL) == 0)
283			error = writelabel();
284		break;
285
286	case WRITEBOOT:
287
288		readlabel(1);
289		fixlabel(&lab);
290		if (argc == 2)
291			makelabel(argv[1], &lab);
292		if (checklabel(NULL) == 0)
293			error = writelabel();
294		break;
295	}
296	exit(error);
297}
298
299static void
300fixlabel(struct disklabel *lp)
301{
302	struct partition *dp;
303	int i;
304
305	for (i = 0; i < lp->d_npartitions; i++) {
306		if (i == RAW_PART)
307			continue;
308		if (lp->d_partitions[i].p_size)
309			return;
310	}
311
312	dp = &lp->d_partitions[0];
313	dp->p_offset = BBSIZE / secsize;
314	dp->p_size = lp->d_secperunit - dp->p_offset;
315}
316
317/*
318 * Construct a prototype disklabel from /etc/disktab.
319 */
320static void
321makelabel(const char *type, struct disklabel *lp)
322{
323	struct disklabel *dp;
324
325	if (strcmp(type, "auto") == 0)
326		dp = getvirginlabel();
327	else
328		dp = getdiskbyname(type);
329	if (dp == NULL)
330		errx(1, "%s: unknown disk type", type);
331	*lp = *dp;
332	bzero(lp->d_packname, sizeof(lp->d_packname));
333}
334
335static void
336readboot(void)
337{
338	int fd;
339	struct stat st;
340
341	if (xxboot == NULL)
342		xxboot = "/boot/boot";
343	fd = open(xxboot, O_RDONLY);
344	if (fd < 0)
345		err(1, "cannot open %s", xxboot);
346	fstat(fd, &st);
347	if (st.st_size <= BBSIZE) {
348		if (read(fd, bootarea, st.st_size) != st.st_size)
349			err(1, "read error %s", xxboot);
350		close(fd);
351		return;
352	}
353	errx(1, "boot code %s is wrong size", xxboot);
354}
355
356static int
357geom_class_available(const char *name)
358{
359	struct gclass *class;
360	struct gmesh mesh;
361	int error;
362
363	error = geom_gettree(&mesh);
364	if (error != 0)
365		errc(1, error, "Cannot get GEOM tree");
366
367	LIST_FOREACH(class, &mesh.lg_class, lg_class) {
368		if (strcmp(class->lg_name, name) == 0) {
369			geom_deletetree(&mesh);
370			return (1);
371		}
372	}
373
374	geom_deletetree(&mesh);
375
376	return (0);
377}
378
379static int
380writelabel(void)
381{
382	int i, fd, serrno;
383	struct gctl_req *grq;
384	char const *errstr;
385	struct disklabel *lp = &lab;
386
387	if (disable_write) {
388		warnx("write to disk label suppressed - label was as follows:");
389		display(stdout, NULL);
390		return (0);
391	}
392
393	lp->d_magic = DISKMAGIC;
394	lp->d_magic2 = DISKMAGIC;
395	lp->d_checksum = 0;
396	lp->d_checksum = dkcksum(lp);
397	if (installboot)
398		readboot();
399	for (i = 0; i < lab.d_npartitions; i++)
400		if (lab.d_partitions[i].p_size)
401			lab.d_partitions[i].p_offset += lba_offset;
402	bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * lab.d_secsize,
403	    lp);
404
405	fd = open(specname, O_RDWR);
406	if (fd < 0) {
407		if (is_file) {
408			warn("cannot open file %s for writing label", specname);
409			return(1);
410		} else
411			serrno = errno;
412
413		if (geom_class_available("PART") != 0) {
414			/*
415			 * Since we weren't able open provider for
416			 * writing, then recommend user to use gpart(8).
417			 */
418			warnc(serrno,
419			    "cannot open provider %s for writing label",
420			    specname);
421			warnx("Try to use gpart(8).");
422			return (1);
423		}
424
425		/* Give up if GEOM_BSD is not available. */
426		if (geom_class_available("BSD") == 0) {
427			warnc(serrno, "%s", specname);
428			return (1);
429		}
430
431		grq = gctl_get_handle();
432		gctl_ro_param(grq, "verb", -1, "write label");
433		gctl_ro_param(grq, "class", -1, "BSD");
434		gctl_ro_param(grq, "geom", -1, pname);
435		gctl_ro_param(grq, "label", 148+16*8,
436			bootarea + labeloffset + labelsoffset * lab.d_secsize);
437		errstr = gctl_issue(grq);
438		if (errstr != NULL) {
439			warnx("%s", errstr);
440			gctl_free(grq);
441			return(1);
442		}
443		gctl_free(grq);
444		if (installboot) {
445			grq = gctl_get_handle();
446			gctl_ro_param(grq, "verb", -1, "write bootcode");
447			gctl_ro_param(grq, "class", -1, "BSD");
448			gctl_ro_param(grq, "geom", -1, pname);
449			gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
450			errstr = gctl_issue(grq);
451			if (errstr != NULL) {
452				warnx("%s", errstr);
453				gctl_free(grq);
454				return (1);
455			}
456			gctl_free(grq);
457		}
458	} else {
459		if (write(fd, bootarea, bbsize) != bbsize) {
460			warn("write %s", specname);
461			close (fd);
462			return (1);
463		}
464		close (fd);
465	}
466	return (0);
467}
468
469static void
470get_file_parms(int f)
471{
472	int i;
473	struct stat sb;
474
475	if (fstat(f, &sb) != 0)
476		err(4, "fstat failed");
477	i = sb.st_mode & S_IFMT;
478	if (i != S_IFREG && i != S_IFLNK)
479		errx(4, "%s is not a valid file or link", specname);
480	secsize = DEV_BSIZE;
481	mediasize = sb.st_size;
482}
483
484/*
485 * Fetch disklabel for disk.
486 */
487static int
488readlabel(int flag)
489{
490	ssize_t nbytes;
491	uint32_t lba;
492	int f, i;
493	int error;
494
495	f = open(specname, O_RDONLY);
496	if (f < 0)
497		err(1, "%s", specname);
498	if (is_file)
499		get_file_parms(f);
500	else {
501		mediasize = g_mediasize(f);
502		secsize = g_sectorsize(f);
503		if (secsize < 0 || mediasize < 0)
504			err(4, "cannot get disk geometry");
505	}
506	if (mediasize > (off_t)0xffffffff * secsize)
507		errx(1,
508		    "disks with more than 2^32-1 sectors are not supported");
509	(void)lseek(f, (off_t)0, SEEK_SET);
510	nbytes = read(f, bootarea, BBSIZE);
511	if (nbytes == -1)
512		err(4, "%s read", specname);
513	if (nbytes != BBSIZE)
514		errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
515	close (f);
516	error = bsd_disklabel_le_dec(
517	    bootarea + (labeloffset + labelsoffset * secsize),
518	    &lab, MAXPARTITIONS);
519	if (flag && error)
520		errx(1, "%s: no valid label found", specname);
521
522	if (is_file)
523		return(0);
524
525	/*
526	 * Compensate for absolute block addressing by finding the
527	 * smallest partition offset and if the offset of the 'c'
528	 * partition is equal to that, subtract it from all offsets.
529	 */
530	lba = ~0;
531	for (i = 0; i < lab.d_npartitions; i++) {
532		if (lab.d_partitions[i].p_size)
533			lba = MIN(lba, lab.d_partitions[i].p_offset);
534	}
535	if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
536		for (i = 0; i < lab.d_npartitions; i++) {
537			if (lab.d_partitions[i].p_size)
538				lab.d_partitions[i].p_offset -= lba;
539		}
540		/*
541		 * Save the offset so that we can write the label
542		 * back with absolute block addresses.
543		 */
544		lba_offset = lba;
545	}
546	return (error);
547}
548
549
550static void
551display(FILE *f, const struct disklabel *lp)
552{
553	int i, j;
554	const struct partition *pp;
555
556	if (lp == NULL)
557		lp = &lab;
558
559	fprintf(f, "# %s:\n", specname);
560	if (allfields) {
561		if (lp->d_type < DKMAXTYPES)
562			fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
563		else
564			fprintf(f, "type: %u\n", lp->d_type);
565		fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
566			lp->d_typename);
567		fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
568			lp->d_packname);
569		fprintf(f, "flags:");
570		if (lp->d_flags & D_REMOVABLE)
571			fprintf(f, " removeable");
572		if (lp->d_flags & D_ECC)
573			fprintf(f, " ecc");
574		if (lp->d_flags & D_BADSECT)
575			fprintf(f, " badsect");
576		fprintf(f, "\n");
577		fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
578		fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
579		fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
580		fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
581		fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
582		fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
583		fprintf(f, "rpm: %u\n", lp->d_rpm);
584		fprintf(f, "interleave: %u\n", lp->d_interleave);
585		fprintf(f, "trackskew: %u\n", lp->d_trackskew);
586		fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
587		fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
588		    (u_long)lp->d_headswitch);
589		fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
590		    (u_long)lp->d_trkseek);
591		fprintf(f, "drivedata: ");
592		for (i = NDDATA - 1; i >= 0; i--)
593			if (lp->d_drivedata[i])
594				break;
595		if (i < 0)
596			i = 0;
597		for (j = 0; j <= i; j++)
598			fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
599		fprintf(f, "\n\n");
600	}
601	fprintf(f, "%u partitions:\n", lp->d_npartitions);
602	fprintf(f,
603	    "#          size     offset    fstype   [fsize bsize bps/cpg]\n");
604	pp = lp->d_partitions;
605	for (i = 0; i < lp->d_npartitions; i++, pp++) {
606		if (pp->p_size) {
607			fprintf(f, "  %c: %10lu %10lu  ", 'a' + i,
608			   (u_long)pp->p_size, (u_long)pp->p_offset);
609			if (pp->p_fstype < FSMAXTYPES)
610				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
611			else
612				fprintf(f, "%8d", pp->p_fstype);
613			switch (pp->p_fstype) {
614
615			case FS_UNUSED:				/* XXX */
616				fprintf(f, "    %5lu %5lu %2s",
617				    (u_long)pp->p_fsize,
618				    (u_long)(pp->p_fsize * pp->p_frag), "");
619				break;
620
621			case FS_BSDFFS:
622				fprintf(f, "    %5lu %5lu %5u",
623				    (u_long)pp->p_fsize,
624				    (u_long)(pp->p_fsize * pp->p_frag),
625				    pp->p_cpg);
626				break;
627
628			case FS_BSDLFS:
629				fprintf(f, "    %5lu %5lu %5d",
630				    (u_long)pp->p_fsize,
631				    (u_long)(pp->p_fsize * pp->p_frag),
632				    pp->p_cpg);
633				break;
634
635			default:
636				fprintf(f, "%20.20s", "");
637				break;
638			}
639			if (i == RAW_PART) {
640				fprintf(f, "  # \"raw\" part, don't edit");
641			}
642			fprintf(f, "\n");
643		}
644	}
645	fflush(f);
646}
647
648static int
649edit(void)
650{
651	int c, fd;
652	struct disklabel label;
653	FILE *fp;
654
655	if ((fd = mkstemp(tmpfil)) == -1 ||
656	    (fp = fdopen(fd, "w")) == NULL) {
657		warnx("can't create %s", tmpfil);
658		return (1);
659	}
660	display(fp, NULL);
661	fclose(fp);
662	for (;;) {
663		if (!editit())
664			break;
665		fp = fopen(tmpfil, "r");
666		if (fp == NULL) {
667			warnx("can't reopen %s for reading", tmpfil);
668			break;
669		}
670		bzero((char *)&label, sizeof(label));
671		c = getasciilabel(fp, &label);
672		fclose(fp);
673		if (c) {
674			lab = label;
675			if (writelabel() == 0) {
676				(void) unlink(tmpfil);
677				return (0);
678			}
679		}
680		printf("re-edit the label? [y]: ");
681		fflush(stdout);
682		c = getchar();
683		if (c != EOF && c != (int)'\n')
684			while (getchar() != (int)'\n')
685				;
686		if  (c == (int)'n')
687			break;
688	}
689	(void) unlink(tmpfil);
690	return (1);
691}
692
693static int
694editit(void)
695{
696	int pid, xpid;
697	int locstat, omask;
698	const char *ed;
699	uid_t uid;
700	gid_t gid;
701
702	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
703	while ((pid = fork()) < 0) {
704		if (errno == EPROCLIM) {
705			warnx("you have too many processes");
706			return(0);
707		}
708		if (errno != EAGAIN) {
709			warn("fork");
710			return(0);
711		}
712		sleep(1);
713	}
714	if (pid == 0) {
715		sigsetmask(omask);
716		gid = getgid();
717		if (setresgid(gid, gid, gid) == -1)
718			err(1, "setresgid");
719		uid = getuid();
720		if (setresuid(uid, uid, uid) == -1)
721			err(1, "setresuid");
722		if ((ed = getenv("EDITOR")) == (char *)0)
723			ed = DEFEDITOR;
724		execlp(ed, ed, tmpfil, (char *)0);
725		err(1, "%s", ed);
726	}
727	while ((xpid = wait(&locstat)) >= 0)
728		if (xpid == pid)
729			break;
730	sigsetmask(omask);
731	return(!locstat);
732}
733
734static char *
735skip(char *cp)
736{
737
738	while (*cp != '\0' && isspace(*cp))
739		cp++;
740	if (*cp == '\0' || *cp == '#')
741		return (NULL);
742	return (cp);
743}
744
745static char *
746word(char *cp)
747{
748	char c;
749
750	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
751		cp++;
752	if ((c = *cp) != '\0') {
753		*cp++ = '\0';
754		if (c != '#')
755			return (skip(cp));
756	}
757	return (NULL);
758}
759
760/*
761 * Read an ascii label in from fd f,
762 * in the same format as that put out by display(),
763 * and fill in lp.
764 */
765static int
766getasciilabel(FILE *f, struct disklabel *lp)
767{
768	char *cp, *endp;
769	const char **cpp;
770	u_int part;
771	char *tp, line[BUFSIZ];
772	u_long v;
773	int lineno = 0, errors = 0;
774	int i;
775
776	makelabel("auto", lp);
777	bzero(&part_set, sizeof(part_set));
778	bzero(&part_size_type, sizeof(part_size_type));
779	bzero(&part_offset_type, sizeof(part_offset_type));
780	lp->d_bbsize = BBSIZE;				/* XXX */
781	lp->d_sbsize = 0;				/* XXX */
782	while (fgets(line, sizeof(line) - 1, f)) {
783		lineno++;
784		if ((cp = strchr(line,'\n')) != NULL)
785			*cp = '\0';
786		cp = skip(line);
787		if (cp == NULL)
788			continue;
789		tp = strchr(cp, ':');
790		if (tp == NULL) {
791			fprintf(stderr, "line %d: syntax error\n", lineno);
792			errors++;
793			continue;
794		}
795		*tp++ = '\0', tp = skip(tp);
796		if (!strcmp(cp, "type")) {
797			if (tp == NULL)
798				tp = unknown;
799			cpp = dktypenames;
800			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
801				if (*cpp && !strcmp(*cpp, tp)) {
802					lp->d_type = cpp - dktypenames;
803					break;
804				}
805			if (cpp < &dktypenames[DKMAXTYPES])
806				continue;
807			errno = 0;
808			v = strtoul(tp, &endp, 10);
809			if (errno != 0 || *endp != '\0')
810				v = DKMAXTYPES;
811			if (v >= DKMAXTYPES)
812				fprintf(stderr, "line %d:%s %lu\n", lineno,
813				    "Warning, unknown disk type", v);
814			else
815				lp->d_type = v;
816			continue;
817		}
818		if (!strcmp(cp, "flags")) {
819			for (v = 0; (cp = tp) && *cp != '\0';) {
820				tp = word(cp);
821				if (!strcmp(cp, "removeable"))
822					v |= D_REMOVABLE;
823				else if (!strcmp(cp, "ecc"))
824					v |= D_ECC;
825				else if (!strcmp(cp, "badsect"))
826					v |= D_BADSECT;
827				else {
828					fprintf(stderr,
829					    "line %d: %s: bad flag\n",
830					    lineno, cp);
831					errors++;
832				}
833			}
834			lp->d_flags = v;
835			continue;
836		}
837		if (!strcmp(cp, "drivedata")) {
838			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
839				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
840				tp = word(cp);
841			}
842			continue;
843		}
844		if (sscanf(cp, "%lu partitions", &v) == 1) {
845			if (v > MAXPARTITIONS) {
846				fprintf(stderr,
847				    "line %d: bad # of partitions\n", lineno);
848				lp->d_npartitions = MAXPARTITIONS;
849				errors++;
850			} else if (v < DEFPARTITIONS) {
851				fprintf(stderr,
852				    "line %d: bad # of partitions\n", lineno);
853				lp->d_npartitions = DEFPARTITIONS;
854				errors++;
855			} else
856				lp->d_npartitions = v;
857			continue;
858		}
859		if (tp == NULL)
860			tp = blank;
861		if (!strcmp(cp, "disk")) {
862			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
863			continue;
864		}
865		if (!strcmp(cp, "label")) {
866			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
867			continue;
868		}
869		if (!strcmp(cp, "bytes/sector")) {
870			v = strtoul(tp, NULL, 10);
871			if (v == 0 || (v % DEV_BSIZE) != 0) {
872				fprintf(stderr,
873				    "line %d: %s: bad sector size\n",
874				    lineno, tp);
875				errors++;
876			} else
877				lp->d_secsize = v;
878			continue;
879		}
880		if (!strcmp(cp, "sectors/track")) {
881			v = strtoul(tp, NULL, 10);
882#if (ULONG_MAX != 0xffffffffUL)
883			if (v == 0 || v > 0xffffffff)
884#else
885			if (v == 0)
886#endif
887			{
888				fprintf(stderr, "line %d: %s: bad %s\n",
889				    lineno, tp, cp);
890				errors++;
891			} else
892				lp->d_nsectors = v;
893			continue;
894		}
895		if (!strcmp(cp, "sectors/cylinder")) {
896			v = strtoul(tp, NULL, 10);
897			if (v == 0) {
898				fprintf(stderr, "line %d: %s: bad %s\n",
899				    lineno, tp, cp);
900				errors++;
901			} else
902				lp->d_secpercyl = v;
903			continue;
904		}
905		if (!strcmp(cp, "tracks/cylinder")) {
906			v = strtoul(tp, NULL, 10);
907			if (v == 0) {
908				fprintf(stderr, "line %d: %s: bad %s\n",
909				    lineno, tp, cp);
910				errors++;
911			} else
912				lp->d_ntracks = v;
913			continue;
914		}
915		if (!strcmp(cp, "cylinders")) {
916			v = strtoul(tp, NULL, 10);
917			if (v == 0) {
918				fprintf(stderr, "line %d: %s: bad %s\n",
919				    lineno, tp, cp);
920				errors++;
921			} else
922				lp->d_ncylinders = v;
923			continue;
924		}
925		if (!strcmp(cp, "sectors/unit")) {
926			v = strtoul(tp, NULL, 10);
927			if (v == 0) {
928				fprintf(stderr, "line %d: %s: bad %s\n",
929				    lineno, tp, cp);
930				errors++;
931			} else
932				lp->d_secperunit = v;
933			continue;
934		}
935		if (!strcmp(cp, "rpm")) {
936			v = strtoul(tp, NULL, 10);
937			if (v == 0 || v > USHRT_MAX) {
938				fprintf(stderr, "line %d: %s: bad %s\n",
939				    lineno, tp, cp);
940				errors++;
941			} else
942				lp->d_rpm = v;
943			continue;
944		}
945		if (!strcmp(cp, "interleave")) {
946			v = strtoul(tp, NULL, 10);
947			if (v == 0 || v > USHRT_MAX) {
948				fprintf(stderr, "line %d: %s: bad %s\n",
949				    lineno, tp, cp);
950				errors++;
951			} else
952				lp->d_interleave = v;
953			continue;
954		}
955		if (!strcmp(cp, "trackskew")) {
956			v = strtoul(tp, NULL, 10);
957			if (v > USHRT_MAX) {
958				fprintf(stderr, "line %d: %s: bad %s\n",
959				    lineno, tp, cp);
960				errors++;
961			} else
962				lp->d_trackskew = v;
963			continue;
964		}
965		if (!strcmp(cp, "cylinderskew")) {
966			v = strtoul(tp, NULL, 10);
967			if (v > USHRT_MAX) {
968				fprintf(stderr, "line %d: %s: bad %s\n",
969				    lineno, tp, cp);
970				errors++;
971			} else
972				lp->d_cylskew = v;
973			continue;
974		}
975		if (!strcmp(cp, "headswitch")) {
976			v = strtoul(tp, NULL, 10);
977			lp->d_headswitch = v;
978			continue;
979		}
980		if (!strcmp(cp, "track-to-track seek")) {
981			v = strtoul(tp, NULL, 10);
982			lp->d_trkseek = v;
983			continue;
984		}
985		/* the ':' was removed above */
986		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
987			fprintf(stderr,
988			    "line %d: %s: Unknown disklabel field\n", lineno,
989			    cp);
990			errors++;
991			continue;
992		}
993
994		/* Process a partition specification line. */
995		part = *cp - 'a';
996		if (part >= lp->d_npartitions) {
997			fprintf(stderr,
998			    "line %d: partition name out of range a-%c: %s\n",
999			    lineno, 'a' + lp->d_npartitions - 1, cp);
1000			errors++;
1001			continue;
1002		}
1003		part_set[part] = 1;
1004
1005		if (getasciipartspec(tp, lp, part, lineno) != 0) {
1006			errors++;
1007			break;
1008		}
1009	}
1010	errors += checklabel(lp);
1011	return (errors == 0);
1012}
1013
1014#define NXTNUM(n) do { \
1015	if (tp == NULL) { \
1016		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1017		return (1); \
1018	} else { \
1019		cp = tp, tp = word(cp); \
1020		(n) = strtoul(cp, NULL, 10); \
1021	} \
1022} while (0)
1023
1024/* retain 1 character following number */
1025#define NXTWORD(w,n) do { \
1026	if (tp == NULL) { \
1027		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1028		return (1); \
1029	} else { \
1030		char *tmp; \
1031		cp = tp, tp = word(cp); \
1032		(n) = strtoul(cp, &tmp, 10); \
1033		if (tmp) (w) = *tmp; \
1034	} \
1035} while (0)
1036
1037/*
1038 * Read a partition line into partition `part' in the specified disklabel.
1039 * Return 0 on success, 1 on failure.
1040 */
1041static int
1042getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1043{
1044	struct partition *pp;
1045	char *cp, *endp;
1046	const char **cpp;
1047	u_long v;
1048
1049	pp = &lp->d_partitions[part];
1050	cp = NULL;
1051
1052	v = 0;
1053	NXTWORD(part_size_type[part],v);
1054	if (v == 0 && part_size_type[part] != '*') {
1055		fprintf(stderr,
1056		    "line %d: %s: bad partition size\n", lineno, cp);
1057		return (1);
1058	}
1059	pp->p_size = v;
1060
1061	v = 0;
1062	NXTWORD(part_offset_type[part],v);
1063	if (v == 0 && part_offset_type[part] != '*' &&
1064	    part_offset_type[part] != '\0') {
1065		fprintf(stderr,
1066		    "line %d: %s: bad partition offset\n", lineno, cp);
1067		return (1);
1068	}
1069	pp->p_offset = v;
1070	if (tp == NULL) {
1071		fprintf(stderr, "line %d: missing file system type\n", lineno);
1072		return (1);
1073	}
1074	cp = tp, tp = word(cp);
1075	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1076		if (*cpp && !strcmp(*cpp, cp))
1077			break;
1078	if (*cpp != NULL) {
1079		pp->p_fstype = cpp - fstypenames;
1080	} else {
1081		if (isdigit(*cp)) {
1082			errno = 0;
1083			v = strtoul(cp, &endp, 10);
1084			if (errno != 0 || *endp != '\0')
1085				v = FSMAXTYPES;
1086		} else
1087			v = FSMAXTYPES;
1088		if (v >= FSMAXTYPES) {
1089			fprintf(stderr,
1090			    "line %d: Warning, unknown file system type %s\n",
1091			    lineno, cp);
1092			v = FS_UNUSED;
1093		}
1094		pp->p_fstype = v;
1095	}
1096
1097	switch (pp->p_fstype) {
1098	case FS_UNUSED:
1099	case FS_BSDFFS:
1100	case FS_BSDLFS:
1101		/* accept defaults for fsize/frag/cpg */
1102		if (tp) {
1103			NXTNUM(pp->p_fsize);
1104			if (pp->p_fsize == 0)
1105				break;
1106			NXTNUM(v);
1107			pp->p_frag = v / pp->p_fsize;
1108			if (tp != NULL)
1109				NXTNUM(pp->p_cpg);
1110		}
1111		/* else default to 0's */
1112		break;
1113	default:
1114		break;
1115	}
1116	return (0);
1117}
1118
1119/*
1120 * Check disklabel for errors and fill in
1121 * derived fields according to supplied values.
1122 */
1123static int
1124checklabel(struct disklabel *lp)
1125{
1126	struct partition *pp;
1127	int i, errors = 0;
1128	char part;
1129	u_long base_offset, needed, total_size, total_percent, current_offset;
1130	long free_space;
1131	int seen_default_offset;
1132	int hog_part;
1133	int j;
1134	struct partition *pp2;
1135
1136	if (lp == NULL)
1137		lp = &lab;
1138
1139	if (allfields) {
1140
1141		if (lp->d_secsize == 0) {
1142			fprintf(stderr, "sector size 0\n");
1143			return (1);
1144		}
1145		if (lp->d_nsectors == 0) {
1146			fprintf(stderr, "sectors/track 0\n");
1147			return (1);
1148		}
1149		if (lp->d_ntracks == 0) {
1150			fprintf(stderr, "tracks/cylinder 0\n");
1151			return (1);
1152		}
1153		if  (lp->d_ncylinders == 0) {
1154			fprintf(stderr, "cylinders/unit 0\n");
1155			errors++;
1156		}
1157		if (lp->d_rpm == 0)
1158			warnx("revolutions/minute 0");
1159		if (lp->d_secpercyl == 0)
1160			lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1161		if (lp->d_secperunit == 0)
1162			lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1163		if (lp->d_bbsize == 0) {
1164			fprintf(stderr, "boot block size 0\n");
1165			errors++;
1166		} else if (lp->d_bbsize % lp->d_secsize)
1167			warnx("boot block size %% sector-size != 0");
1168		if (lp->d_npartitions > MAXPARTITIONS) {
1169			warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1170			    (u_long)lp->d_npartitions, MAXPARTITIONS);
1171			errors++;
1172		}
1173		if (lp->d_npartitions < DEFPARTITIONS) {
1174			warnx("number of partitions (%lu) < DEFPARTITIONS (%d)",
1175			    (u_long)lp->d_npartitions, DEFPARTITIONS);
1176			errors++;
1177		}
1178	} else {
1179		struct disklabel *vl;
1180
1181		vl = getvirginlabel();
1182		if (lp->d_secsize == 0)
1183			lp->d_secsize = vl->d_secsize;
1184		if (lp->d_nsectors == 0)
1185			lp->d_nsectors = vl->d_nsectors;
1186		if (lp->d_ntracks == 0)
1187			lp->d_ntracks = vl->d_ntracks;
1188		if (lp->d_ncylinders == 0)
1189			lp->d_ncylinders = vl->d_ncylinders;
1190		if (lp->d_rpm == 0)
1191			lp->d_rpm = vl->d_rpm;
1192		if (lp->d_interleave == 0)
1193			lp->d_interleave = vl->d_interleave;
1194		if (lp->d_secpercyl == 0)
1195			lp->d_secpercyl = vl->d_secpercyl;
1196		if (lp->d_secperunit == 0 ||
1197		    lp->d_secperunit > vl->d_secperunit)
1198			lp->d_secperunit = vl->d_secperunit;
1199		if (lp->d_bbsize == 0)
1200			lp->d_bbsize = vl->d_bbsize;
1201		if (lp->d_npartitions < DEFPARTITIONS ||
1202		    lp->d_npartitions > MAXPARTITIONS)
1203			lp->d_npartitions = vl->d_npartitions;
1204	}
1205
1206
1207	/* first allocate space to the partitions, then offsets */
1208	total_size = 0; /* in sectors */
1209	total_percent = 0; /* in percent */
1210	hog_part = -1;
1211	/* find all fixed partitions */
1212	for (i = 0; i < lp->d_npartitions; i++) {
1213		pp = &lp->d_partitions[i];
1214		if (part_set[i]) {
1215			if (part_size_type[i] == '*') {
1216				if (i == RAW_PART) {
1217					pp->p_size = lp->d_secperunit;
1218				} else {
1219					if (hog_part != -1)
1220						warnx("Too many '*' partitions (%c and %c)",
1221						    hog_part + 'a',i + 'a');
1222					else
1223						hog_part = i;
1224				}
1225			} else {
1226				off_t size;
1227
1228				size = pp->p_size;
1229				switch (part_size_type[i]) {
1230				case '%':
1231					total_percent += size;
1232					break;
1233				case 't':
1234				case 'T':
1235					size *= 1024ULL;
1236					/* FALLTHROUGH */
1237				case 'g':
1238				case 'G':
1239					size *= 1024ULL;
1240					/* FALLTHROUGH */
1241				case 'm':
1242				case 'M':
1243					size *= 1024ULL;
1244					/* FALLTHROUGH */
1245				case 'k':
1246				case 'K':
1247					size *= 1024ULL;
1248					break;
1249				case '\0':
1250					break;
1251				default:
1252					warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1253					    part_size_type[i], i + 'a');
1254					break;
1255				}
1256				/* don't count %'s yet */
1257				if (part_size_type[i] != '%') {
1258					/*
1259					 * for all not in sectors, convert to
1260					 * sectors
1261					 */
1262					if (part_size_type[i] != '\0') {
1263						if (size % lp->d_secsize != 0)
1264							warnx("partition %c not an integer number of sectors",
1265							    i + 'a');
1266						size /= lp->d_secsize;
1267						pp->p_size = size;
1268					}
1269					/* else already in sectors */
1270					if (i != RAW_PART)
1271						total_size += size;
1272				}
1273			}
1274		}
1275	}
1276
1277	/* Find out the total free space, excluding the boot block area. */
1278	base_offset = BBSIZE / secsize;
1279	free_space = 0;
1280	for (i = 0; i < lp->d_npartitions; i++) {
1281		pp = &lp->d_partitions[i];
1282		if (!part_set[i] || i == RAW_PART ||
1283		    part_size_type[i] == '%' || part_size_type[i] == '*')
1284			continue;
1285		if (pp->p_offset > base_offset)
1286			free_space += pp->p_offset - base_offset;
1287		if (pp->p_offset + pp->p_size > base_offset)
1288			base_offset = pp->p_offset + pp->p_size;
1289	}
1290	if (base_offset < lp->d_secperunit)
1291		free_space += lp->d_secperunit - base_offset;
1292
1293	/* handle % partitions - note %'s don't need to add up to 100! */
1294	if (total_percent != 0) {
1295		if (total_percent > 100) {
1296			fprintf(stderr,"total percentage %lu is greater than 100\n",
1297			    total_percent);
1298			errors++;
1299		}
1300
1301		if (free_space > 0) {
1302			for (i = 0; i < lp->d_npartitions; i++) {
1303				pp = &lp->d_partitions[i];
1304				if (part_set[i] && part_size_type[i] == '%') {
1305					/* careful of overflows! and integer roundoff */
1306					pp->p_size = ((double)pp->p_size/100) * free_space;
1307					total_size += pp->p_size;
1308
1309					/* FIX we can lose a sector or so due to roundoff per
1310					   partition.  A more complex algorithm could avoid that */
1311				}
1312			}
1313		} else {
1314			fprintf(stderr,
1315			    "%ld sectors available to give to '*' and '%%' partitions\n",
1316			    free_space);
1317			errors++;
1318			/* fix?  set all % partitions to size 0? */
1319		}
1320	}
1321	/* give anything remaining to the hog partition */
1322	if (hog_part != -1) {
1323		/*
1324		 * Find the range of offsets usable by '*' partitions around
1325		 * the hog partition and how much space they need.
1326		 */
1327		needed = 0;
1328		base_offset = BBSIZE / secsize;
1329		for (i = hog_part - 1; i >= 0; i--) {
1330			pp = &lp->d_partitions[i];
1331			if (!part_set[i] || i == RAW_PART)
1332				continue;
1333			if (part_offset_type[i] == '*') {
1334				needed += pp->p_size;
1335				continue;
1336			}
1337			base_offset = pp->p_offset + pp->p_size;
1338			break;
1339		}
1340		current_offset = lp->d_secperunit;
1341		for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1342			pp = &lp->d_partitions[i];
1343			if (!part_set[i] || i == RAW_PART)
1344				continue;
1345			if (part_offset_type[i] == '*') {
1346				needed += pp->p_size;
1347				continue;
1348			}
1349			current_offset = pp->p_offset;
1350		}
1351
1352		if (current_offset - base_offset <= needed) {
1353			fprintf(stderr, "Cannot find space for partition %c\n",
1354			    hog_part + 'a');
1355			fprintf(stderr,
1356			    "Need more than %lu sectors between %lu and %lu\n",
1357			    needed, base_offset, current_offset);
1358			errors++;
1359			lp->d_partitions[hog_part].p_size = 0;
1360		} else {
1361			lp->d_partitions[hog_part].p_size = current_offset -
1362			    base_offset - needed;
1363			total_size += lp->d_partitions[hog_part].p_size;
1364		}
1365	}
1366
1367	/* Now set the offsets for each partition */
1368	current_offset = BBSIZE / secsize; /* in sectors */
1369	seen_default_offset = 0;
1370	for (i = 0; i < lp->d_npartitions; i++) {
1371		part = 'a' + i;
1372		pp = &lp->d_partitions[i];
1373		if (part_set[i]) {
1374			if (part_offset_type[i] == '*') {
1375				if (i == RAW_PART) {
1376					pp->p_offset = 0;
1377				} else {
1378					pp->p_offset = current_offset;
1379					seen_default_offset = 1;
1380				}
1381			} else {
1382				/* allow them to be out of order for old-style tables */
1383				if (pp->p_offset < current_offset &&
1384				    seen_default_offset && i != RAW_PART &&
1385				    pp->p_fstype != FS_VINUM) {
1386					fprintf(stderr,
1387"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1388					    (long)pp->p_offset,i+'a',current_offset);
1389					fprintf(stderr,
1390"Labels with any *'s for offset must be in ascending order by sector\n");
1391					errors++;
1392				} else if (pp->p_offset != current_offset &&
1393				    i != RAW_PART && seen_default_offset) {
1394					/*
1395					 * this may give unneeded warnings if
1396					 * partitions are out-of-order
1397					 */
1398					warnx(
1399"Offset %ld for partition %c doesn't match expected value %ld",
1400					    (long)pp->p_offset, i + 'a', current_offset);
1401				}
1402			}
1403			if (i != RAW_PART)
1404				current_offset = pp->p_offset + pp->p_size;
1405		}
1406	}
1407
1408	for (i = 0; i < lp->d_npartitions; i++) {
1409		part = 'a' + i;
1410		pp = &lp->d_partitions[i];
1411		if (pp->p_size == 0 && pp->p_offset != 0)
1412			warnx("partition %c: size 0, but offset %lu",
1413			    part, (u_long)pp->p_offset);
1414#ifdef notdef
1415		if (pp->p_size % lp->d_secpercyl)
1416			warnx("partition %c: size %% cylinder-size != 0",
1417			    part);
1418		if (pp->p_offset % lp->d_secpercyl)
1419			warnx("partition %c: offset %% cylinder-size != 0",
1420			    part);
1421#endif
1422		if (pp->p_offset > lp->d_secperunit) {
1423			fprintf(stderr,
1424			    "partition %c: offset past end of unit\n", part);
1425			errors++;
1426		}
1427		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1428			fprintf(stderr,
1429			"partition %c: partition extends past end of unit\n",
1430			    part);
1431			errors++;
1432		}
1433		if (i == RAW_PART) {
1434			if (pp->p_fstype != FS_UNUSED)
1435				warnx("partition %c is not marked as unused!",part);
1436			if (pp->p_offset != 0)
1437				warnx("partition %c doesn't start at 0!",part);
1438			if (pp->p_size != lp->d_secperunit)
1439				warnx("partition %c doesn't cover the whole unit!",part);
1440
1441			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1442			    (pp->p_size != lp->d_secperunit)) {
1443				warnx("An incorrect partition %c may cause problems for "
1444				    "standard system utilities",part);
1445			}
1446		}
1447
1448		/* check for overlaps */
1449		/* this will check for all possible overlaps once and only once */
1450		for (j = 0; j < i; j++) {
1451			pp2 = &lp->d_partitions[j];
1452			if (j != RAW_PART && i != RAW_PART &&
1453			    pp->p_fstype != FS_VINUM &&
1454			    pp2->p_fstype != FS_VINUM &&
1455			    part_set[i] && part_set[j]) {
1456				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1457				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1458					pp2->p_offset >= pp->p_offset)) {
1459					fprintf(stderr,"partitions %c and %c overlap!\n",
1460					    j + 'a', i + 'a');
1461					errors++;
1462				}
1463			}
1464		}
1465	}
1466	for (; i < lp->d_npartitions; i++) {
1467		part = 'a' + i;
1468		pp = &lp->d_partitions[i];
1469		if (pp->p_size || pp->p_offset)
1470			warnx("unused partition %c: size %d offset %lu",
1471			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1472	}
1473	return (errors);
1474}
1475
1476/*
1477 * When operating on a "virgin" disk, try getting an initial label
1478 * from the associated device driver.  This might work for all device
1479 * drivers that are able to fetch some initial device parameters
1480 * without even having access to a (BSD) disklabel, like SCSI disks,
1481 * most IDE drives, or vn devices.
1482 *
1483 * The device name must be given in its "canonical" form.
1484 */
1485static struct disklabel *
1486getvirginlabel(void)
1487{
1488	static struct disklabel loclab;
1489	struct partition *dp;
1490	int f;
1491	u_int u;
1492
1493	if ((f = open(specname, O_RDONLY)) == -1) {
1494		warn("cannot open %s", specname);
1495		return (NULL);
1496	}
1497
1498	if (is_file)
1499		get_file_parms(f);
1500	else {
1501		mediasize = g_mediasize(f);
1502		secsize = g_sectorsize(f);
1503		if (secsize < 0 || mediasize < 0) {
1504			close (f);
1505			return (NULL);
1506		}
1507	}
1508	memset(&loclab, 0, sizeof loclab);
1509	loclab.d_magic = DISKMAGIC;
1510	loclab.d_magic2 = DISKMAGIC;
1511	loclab.d_secsize = secsize;
1512	loclab.d_secperunit = mediasize / secsize;
1513
1514	/*
1515	 * Nobody in these enlightened days uses the CHS geometry for
1516	 * anything, but nonetheless try to get it right.  If we fail
1517	 * to get any good ideas from the device, construct something
1518	 * which is IBM-PC friendly.
1519	 */
1520	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1521		loclab.d_nsectors = u;
1522	else
1523		loclab.d_nsectors = 63;
1524	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1525		loclab.d_ntracks = u;
1526	else if (loclab.d_secperunit <= 63*1*1024)
1527		loclab.d_ntracks = 1;
1528	else if (loclab.d_secperunit <= 63*16*1024)
1529		loclab.d_ntracks = 16;
1530	else
1531		loclab.d_ntracks = 255;
1532	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1533	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1534	loclab.d_npartitions = DEFPARTITIONS;
1535
1536	/* Various (unneeded) compat stuff */
1537	loclab.d_rpm = 3600;
1538	loclab.d_bbsize = BBSIZE;
1539	loclab.d_interleave = 1;
1540	strncpy(loclab.d_typename, "amnesiac",
1541	    sizeof(loclab.d_typename));
1542
1543	dp = &loclab.d_partitions[RAW_PART];
1544	dp->p_size = loclab.d_secperunit;
1545	loclab.d_checksum = dkcksum(&loclab);
1546	close (f);
1547	return (&loclab);
1548}
1549
1550static void
1551usage(void)
1552{
1553
1554	fprintf(stderr,
1555	"%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",
1556	"usage: bsdlabel disk",
1557	"\t\t(to read label)",
1558	"	bsdlabel -w [-n] [-m machine] disk [type]",
1559	"\t\t(to write label with existing boot program)",
1560	"	bsdlabel -e [-n] [-m machine] disk",
1561	"\t\t(to edit label)",
1562	"	bsdlabel -R [-n] [-m machine] disk protofile",
1563	"\t\t(to restore label with existing boot program)",
1564	"	bsdlabel -B [-b boot] [-m machine] disk",
1565	"\t\t(to install boot program with existing on-disk label)",
1566	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1567	"\t\t(to write label and install boot program)",
1568	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1569		"\t\t(to restore label and install boot program)"
1570	);
1571	exit(1);
1572}
1573