bsdlabel.c revision 114550 
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#ifndef lint
44static const char copyright[] =
45"@(#) Copyright (c) 1987, 1993\n\
46	The Regents of the University of California.  All rights reserved.\n";
47#endif /* not lint */
48
49#ifndef lint
50#if 0
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
54#endif /* not lint */
55
56#include <sys/cdefs.h>
57__FBSDID("$FreeBSD: head/sbin/bsdlabel/bsdlabel.c 114550 2003-05-02 19:58:08Z phk $");
58
59#include <sys/param.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#include <sys/disklabel.h>
67
68#include <sys/diskmbr.h>
69#if (DOSPARTOFF != 446 || NDOSPART != 4 || DOSPTYP_386BSD != 0xa5)
70#error	<sys/diskmbr.h> has changed
71#else
72#define	I386_DOSPARTOFF		446
73#define	I386_NDOSPART		4
74#define	I386_DOSPTYP_386BSD	0xa5
75#endif
76#undef DOSPARTOFF
77#undef NDOSPART
78#undef DOSPTYP_386BSD
79
80#include <sys/diskpc98.h>
81#if (DOSPARTOFF != 0 || NDOSPART != 16 || DOSPTYP_386BSD != 0x94)
82#error	<sys/diskpc98.h> has changed
83#else
84#define	PC98_DOSPARTOFF		0
85#define	PC98_NDOSPART		16
86#define	PC98_DOSPTYP_386BSD	0x94
87#endif
88#undef DOSPARTOFF
89#undef NDOSPART
90#undef DOSPTYP_386BSD
91
92#define	IS_PC98	(arch->mach == MACH_PC98)
93#define	DOSPARTOFF	(IS_PC98 ? PC98_DOSPARTOFF : I386_DOSPARTOFF)
94#define	NDOSPART	(IS_PC98 ? PC98_NDOSPART : I386_NDOSPART)
95#define	DOSPTYP_386BSD	(IS_PC98 ? PC98_DOSPTYP_386BSD : I386_DOSPTYP_386BSD)
96
97#include <unistd.h>
98#include <string.h>
99#include <stdio.h>
100#include <stdlib.h>
101#include <signal.h>
102#include <stdarg.h>
103#include <ctype.h>
104#include <err.h>
105#include <errno.h>
106
107#include "pathnames.h"
108
109/*
110 * Disklabel: read and write bsdlabels.
111 * The label is usually placed on one of the first sectors of the disk.
112 * Many machines also place a bootstrap in the same area,
113 * in which case the label is embedded in the bootstrap.
114 * The bootstrap source must leave space at the proper offset
115 * for the label on such machines.
116 */
117
118#ifndef BBSIZE
119#define	BBSIZE	8192			/* size of boot area, with label */
120#endif
121
122/* FIX!  These are too low, but are traditional */
123#define DEFAULT_NEWFS_BLOCK  8192U
124#define DEFAULT_NEWFS_FRAG   1024U
125#define DEFAULT_NEWFS_CPG    16U
126
127#define BIG_NEWFS_BLOCK  16384U
128#define BIG_NEWFS_FRAG   2048U
129#define BIG_NEWFS_CPG    64U
130
131void	makelabel(const char *, const char *, struct disklabel *);
132int	writelabel(int, void *, struct disklabel *);
133void	l_perror(const char *);
134struct disklabel *readlabel(int);
135struct disklabel *makebootarea(void *, struct disklabel *, int);
136void	display(FILE *, const struct disklabel *);
137int	edit(struct disklabel *, int);
138int	editit(void);
139char	*skip(char *);
140char	*word(char *);
141int	getasciilabel(FILE *, struct disklabel *);
142int	getasciipartspec(char *, struct disklabel *, int, int);
143int	checklabel(struct disklabel *);
144void	Warning(const char *, ...) __printflike(1, 2);
145void	usage(void);
146struct disklabel *getvirginlabel(void);
147
148#define	DEFEDITOR	_PATH_VI
149#define	streq(a,b)	(strcmp(a,b) == 0)
150
151char	*dkname;
152char	*specname;
153char	tmpfil[] = PATH_TMPFILE;
154
155char	namebuf[BBSIZE], *np = namebuf;
156struct	disklabel lab;
157int64_t	bootarea[BBSIZE / 8];
158char	blank[] = "";
159char	unknown[] = "unknown";
160
161#define MAX_PART ('z')
162#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
163char    part_size_type[MAX_NUM_PARTS];
164char    part_offset_type[MAX_NUM_PARTS];
165int     part_set[MAX_NUM_PARTS];
166
167int	installboot;	/* non-zero if we should install a boot program */
168char	*xxboot;	/* primary boot */
169char	boot0[MAXPATHLEN];
170
171static int labeloffset;
172static int bbsize;
173static int alphacksum;
174
175enum	{
176	UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
177} op = UNSPEC;
178
179enum { ARCH_I386, ARCH_ALPHA, ARCH_IA64 };
180
181enum { MACH_I386, MACH_PC98 };
182
183struct {
184	const char	*name;
185	int		arch;
186	int		mach;
187	off_t		label_sector;
188	off_t		label_offset;
189} arches[] = {
190	{ "i386", ARCH_I386, MACH_I386, 1, 0 },
191	{ "pc98", ARCH_I386, MACH_PC98, 1, 0 },
192	{ "alpha", ARCH_ALPHA, ARCH_ALPHA, 0, 64 },
193	{ "ia64", ARCH_IA64, ARCH_IA64, 1, 0 },
194}, *arch;
195#define	NARCHES	(int)(sizeof(arches) / sizeof(*arches))
196
197int	rflag;
198int	disable_write;   /* set to disable writing to disk label */
199
200int
201main(int argc, char *argv[])
202{
203	struct disklabel *lp;
204	FILE *t;
205	int ch, f = 0, error = 0, i;
206	char *name = 0;
207
208	while ((ch = getopt(argc, argv, "Bb:em:nRrs:w")) != -1)
209		switch (ch) {
210			case 'B':
211				++installboot;
212				break;
213			case 'b':
214				xxboot = optarg;
215				break;
216			case 'm':
217				if (!strcmp(optarg, "i386")) {
218					labeloffset = 512;
219					bbsize = 8192;
220				} else if (!strcmp(optarg, "alpha")) {
221					labeloffset = 64;
222					bbsize = 8192;
223					alphacksum = 1;
224				}
225				for (i = 0; i < NARCHES &&
226				    strcmp(arches[i].name, optarg) != 0;
227				    i++);
228				if (i == NARCHES)
229					errx(1, "%s: unknown architecture",
230					    optarg);
231				arch = &arches[i];
232				break;
233			case 'n':
234				disable_write = 1;
235				break;
236			case 'R':
237				if (op != UNSPEC)
238					usage();
239				op = RESTORE;
240				break;
241			case 'e':
242				if (op != UNSPEC)
243					usage();
244				op = EDIT;
245				break;
246			case 'r':
247				++rflag;
248				break;
249			case 'w':
250				if (op != UNSPEC)
251					usage();
252				op = WRITE;
253				break;
254			case '?':
255			default:
256				usage();
257		}
258	argc -= optind;
259	argv += optind;
260	if (installboot) {
261		rflag++;
262		if (op == UNSPEC)
263			op = WRITEBOOT;
264	} else {
265		if (op == UNSPEC)
266			op = READ;
267		xxboot = 0;
268	}
269	if (argc < 1)
270		usage();
271
272	if (arch == NULL) {
273		for (i = 0; i < NARCHES; i++)
274			if (strcmp(arches[i].name,
275#if defined(__i386__)
276#ifdef PC98
277			    "pc98"
278#else
279			    "i386"
280#endif
281#elif defined(__alpha__)
282			    "alpha"
283#elif defined(__ia64__)
284			    "ia64"
285#else
286			    "unknown"
287#endif
288			    ) == 0) {
289				arch = &arches[i];
290				break;
291			}
292		if (i == NARCHES)
293			errx(1, "unsupported architecture");
294	}
295
296	dkname = argv[0];
297	if (dkname[0] != '/') {
298		(void)sprintf(np, "%s%s%c", _PATH_DEV, dkname, 'a' + RAW_PART);
299		specname = np;
300		np += strlen(specname) + 1;
301	} else
302		specname = dkname;
303	f = open(specname, op == READ ? O_RDONLY : O_RDWR);
304	if (f < 0 && errno == ENOENT && dkname[0] != '/') {
305		(void)sprintf(specname, "%s%s", _PATH_DEV, dkname);
306		np = namebuf + strlen(specname) + 1;
307		f = open(specname, op == READ ? O_RDONLY : O_RDWR);
308	}
309	if (f < 0 && errno == EBUSY) {
310		/* lets try to get by with ioctls */
311		f = open(specname, O_RDONLY);
312	}
313	if (f < 0)
314		err(4, "%s", specname);
315
316	switch(op) {
317
318	case UNSPEC:
319		break;
320
321	case EDIT:
322		if (argc != 1)
323			usage();
324		lp = readlabel(f);
325		error = edit(lp, f);
326		break;
327
328	case READ:
329		if (argc != 1)
330			usage();
331		lp = readlabel(f);
332		display(stdout, lp);
333		error = checklabel(lp);
334		break;
335
336	case RESTORE:
337		if (argc != 2)
338			usage();
339		if (!(t = fopen(argv[1], "r")))
340			err(4, "%s", argv[1]);
341		if (!getasciilabel(t, &lab))
342			exit(1);
343		lp = makebootarea(bootarea, &lab, f);
344		*lp = lab;
345		error = writelabel(f, bootarea, lp);
346		break;
347
348	case WRITE:
349		if (argc == 3) {
350			name = argv[2];
351			argc--;
352		}
353		if (argc != 2)
354			usage();
355		makelabel(argv[1], name, &lab);
356		lp = makebootarea(bootarea, &lab, f);
357		*lp = lab;
358		if (checklabel(lp) == 0)
359			error = writelabel(f, bootarea, lp);
360		break;
361
362	case WRITEBOOT:
363	{
364		struct disklabel tlab;
365
366		lp = readlabel(f);
367		tlab = *lp;
368		if (argc == 2)
369			makelabel(argv[1], 0, &lab);
370		lp = makebootarea(bootarea, &lab, f);
371		*lp = tlab;
372		if (checklabel(lp) == 0)
373			error = writelabel(f, bootarea, lp);
374		break;
375	}
376	}
377	exit(error);
378}
379
380/*
381 * Construct a prototype disklabel from /etc/disktab.
382 */
383void
384makelabel(const char *type, const char *name, struct disklabel *lp)
385{
386	struct disklabel *dp;
387
388	if (strcmp(type, "auto") == 0)
389		dp = getvirginlabel();
390	else
391		dp = getdiskbyname(type);
392	if (dp == NULL)
393		errx(1, "%s: unknown disk type", type);
394	*lp = *dp;
395	bzero(lp->d_packname, sizeof(lp->d_packname));
396	if (name)
397		(void)strncpy(lp->d_packname, name, sizeof(lp->d_packname));
398}
399
400int
401writelabel(int f, void *boot, struct disklabel *lp)
402{
403	uint64_t *p, sum;
404	int i;
405
406	if (disable_write) {
407		Warning("write to disk label supressed - label was as follows:");
408		display(stdout, lp);
409		return (0);
410	}
411
412	lp->d_magic = DISKMAGIC;
413	lp->d_magic2 = DISKMAGIC;
414	lp->d_checksum = 0;
415	lp->d_checksum = dkcksum(lp);
416	if (!rflag) {
417		if (ioctl(f, DIOCWDINFO, lp) < 0) {
418			l_perror("ioctl DIOCWDINFO");
419			return (1);
420		}
421		return (0);
422	}
423
424	bsd_disklabel_le_enc((u_char *)boot + labeloffset, lp);
425
426	(void)lseek(f, (off_t)0, SEEK_SET);
427
428	if (arch->arch == ARCH_ALPHA) {
429		/*
430		 * Generate the bootblock checksum for the SRM console.
431		 */
432		for (p = (uint64_t *)boot, i = 0, sum = 0; i < 63; i++)
433			sum += p[i];
434		p[63] = sum;
435	}
436	if (ioctl(f, DIOCBSDBB, &boot) == 0)
437		return (0);
438	if (write(f, boot, bbsize) != bbsize) {
439		warn("write");
440		return (1);
441	}
442	return (0);
443}
444
445void
446l_perror(const char *s)
447{
448	switch (errno) {
449
450	case ESRCH:
451		warnx("%s: no disk label on disk;", s);
452		fprintf(stderr, "add \"-r\" to install initial label\n");
453		break;
454
455	case EINVAL:
456		warnx("%s: label magic number or checksum is wrong!", s);
457		fprintf(stderr, "(disklabel or kernel is out of date?)\n");
458		break;
459
460	case EBUSY:
461		warnx("%s: open partition would move or shrink", s);
462		break;
463
464	case EXDEV:
465		warnx("%s: '%c' partition must start at beginning of disk",
466		    s, 'a' + RAW_PART);
467		break;
468
469	default:
470		warn((char *)NULL);
471		break;
472	}
473}
474
475/*
476 * Fetch disklabel for disk.
477 * Use ioctl to get label unless -r flag is given.
478 */
479struct disklabel *
480readlabel(int f)
481{
482
483	(void)lseek(f, (off_t)0, SEEK_SET);
484	if (read(f, bootarea, BBSIZE) < BBSIZE)
485		err(4, "%s", specname);
486	bsd_disklabel_le_dec((u_char *)bootarea + labeloffset, &lab);
487	return (&lab);
488}
489
490/*
491 * Construct a bootarea (d_bbsize bytes) in the specified buffer ``boot''
492 * Returns a pointer to the disklabel portion of the bootarea.
493 */
494struct disklabel *
495makebootarea(void *boot, struct disklabel *dp, int f)
496{
497	struct disklabel *lp;
498	char *p;
499	int b;
500	char *dkbasename;
501	struct stat sb;
502	uint64_t *bootinfo;
503	int n;
504	char *tmpbuf;
505	int i, found, dps;
506
507	/* XXX */
508	if (dp->d_secsize == 0) {
509		dp->d_secsize = DEV_BSIZE;
510		dp->d_bbsize = BBSIZE;
511	}
512	lp = (struct disklabel *)
513	    ((char *)boot + (arch->label_sector * dp->d_secsize) +
514	    arch->label_offset);
515	bzero((char *)lp, sizeof *lp);
516	/*
517	 * If we are not installing a boot program but we are installing a
518	 * label on disk then we must read the current bootarea so we don't
519	 * clobber the existing boot.
520	 */
521	if (!installboot) {
522		if (rflag) {
523			if (read(f, boot, BBSIZE) < BBSIZE)
524				err(4, "%s", specname);
525			bzero((char *)lp, sizeof *lp);
526		}
527		return (lp);
528	}
529	/*
530	 * We are installing a boot program.  Determine the name(s) and
531	 * read them into the appropriate places in the boot area.
532	 */
533	if (!xxboot) {
534		dkbasename = np;
535		if ((p = rindex(dkname, '/')) == NULL)
536			p = dkname;
537		else
538			p++;
539		while (*p && !isdigit(*p))
540			*np++ = *p++;
541		*np++ = '\0';
542
543		if (!xxboot) {
544			(void)sprintf(boot0, "%s/boot", _PATH_BOOTDIR);
545			xxboot = boot0;
546		}
547	}
548
549	b = open(xxboot, O_RDONLY);
550	if (b < 0)
551		err(4, "%s", xxboot);
552	if (fstat(b, &sb) != 0)
553		err(4, "%s", xxboot);
554	if (arch->arch == ARCH_I386) {
555		if (sb.st_size > BBSIZE)
556			errx(4, "%s too large", xxboot);
557		/*
558		 * XXX Botch alert.
559		 * The i386/PC98 has the so-called fdisk table embedded into the
560		 * primary bootstrap.  We take care to not clobber it, but
561		 * only if it does already contain some data.  (Otherwise,
562		 * the xxboot provides a template.)
563		 */
564		if ((tmpbuf = (char *)malloc((int)dp->d_secsize)) == 0)
565			err(4, "%s", xxboot);
566		memcpy((void *)tmpbuf, (void *)boot, (int)dp->d_secsize);
567
568		if (read(b, boot, BBSIZE) < 0)
569			err(4, "%s", xxboot);
570
571		/* XXX: rely on some very precise overlaps in definitions */
572		dps = IS_PC98 ? sizeof(struct pc98_partition) :
573		    sizeof(struct dos_partition);
574		for (i = DOSPARTOFF, found = 0;
575		     !found && i < (int)(DOSPARTOFF + NDOSPART * dps);
576		     i++)
577			found = tmpbuf[i] != 0;
578		if (found)
579			memcpy((void *)&((char *)boot)[DOSPARTOFF],
580			       (void *)&tmpbuf[DOSPARTOFF],
581			       NDOSPART * dps);
582		free(tmpbuf);
583	}
584
585	if (arch->arch == ARCH_ALPHA) {
586		if (sb.st_size > BBSIZE - dp->d_secsize)
587			errx(4, "%s too large", xxboot);
588		/*
589		 * On the alpha, the primary bootstrap starts at the
590		 * second sector of the boot area.  The first sector
591		 * contains the label and must be edited to contain the
592		 * size and location of the primary bootstrap.
593		 */
594		n = read(b, (char *)boot + dp->d_secsize,
595		    BBSIZE - dp->d_secsize);
596		if (n < 0)
597			err(4, "%s", xxboot);
598		bootinfo = (uint64_t *)((char *)boot + 480);
599		bootinfo[0] = (n + dp->d_secsize - 1) / dp->d_secsize;
600		bootinfo[1] = 1;	/* start at sector 1 */
601		bootinfo[2] = 0;	/* flags (must be zero) */
602	}
603
604	(void)close(b);
605	return (lp);
606}
607
608void
609display(FILE *f, const struct disklabel *lp)
610{
611	int i, j;
612	const struct partition *pp;
613
614	fprintf(f, "# %s:\n", specname);
615	if (lp->d_type < DKMAXTYPES)
616		fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
617	else
618		fprintf(f, "type: %u\n", lp->d_type);
619	fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
620		lp->d_typename);
621	fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
622		lp->d_packname);
623	fprintf(f, "flags:");
624	if (lp->d_flags & D_REMOVABLE)
625		fprintf(f, " removeable");
626	if (lp->d_flags & D_ECC)
627		fprintf(f, " ecc");
628	if (lp->d_flags & D_BADSECT)
629		fprintf(f, " badsect");
630	fprintf(f, "\n");
631	fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
632	fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
633	fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
634	fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
635	fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
636	fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
637	fprintf(f, "rpm: %u\n", lp->d_rpm);
638	fprintf(f, "interleave: %u\n", lp->d_interleave);
639	fprintf(f, "trackskew: %u\n", lp->d_trackskew);
640	fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
641	fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
642	    (u_long)lp->d_headswitch);
643	fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
644	    (u_long)lp->d_trkseek);
645	fprintf(f, "drivedata: ");
646	for (i = NDDATA - 1; i >= 0; i--)
647		if (lp->d_drivedata[i])
648			break;
649	if (i < 0)
650		i = 0;
651	for (j = 0; j <= i; j++)
652		fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
653	fprintf(f, "\n\n%u partitions:\n", lp->d_npartitions);
654	fprintf(f,
655	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
656	pp = lp->d_partitions;
657	for (i = 0; i < lp->d_npartitions; i++, pp++) {
658		if (pp->p_size) {
659			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
660			   (u_long)pp->p_size, (u_long)pp->p_offset);
661			if (pp->p_fstype < FSMAXTYPES)
662				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
663			else
664				fprintf(f, "%8d", pp->p_fstype);
665			switch (pp->p_fstype) {
666
667			case FS_UNUSED:				/* XXX */
668				fprintf(f, "    %5lu %5lu %5.5s ",
669				    (u_long)pp->p_fsize,
670				    (u_long)(pp->p_fsize * pp->p_frag), "");
671				break;
672
673			case FS_BSDFFS:
674				fprintf(f, "    %5lu %5lu %5u ",
675				    (u_long)pp->p_fsize,
676				    (u_long)(pp->p_fsize * pp->p_frag),
677				    pp->p_cpg);
678				break;
679
680			case FS_BSDLFS:
681				fprintf(f, "    %5lu %5lu %5d",
682				    (u_long)pp->p_fsize,
683				    (u_long)(pp->p_fsize * pp->p_frag),
684				    pp->p_cpg);
685				break;
686
687			default:
688				fprintf(f, "%20.20s", "");
689				break;
690			}
691			fprintf(f, "\t# (Cyl. %4lu",
692			    (u_long)(pp->p_offset / lp->d_secpercyl));
693			if (pp->p_offset % lp->d_secpercyl)
694			    putc('*', f);
695			else
696			    putc(' ', f);
697			fprintf(f, "- %lu",
698			    (u_long)((pp->p_offset + pp->p_size +
699			    lp->d_secpercyl - 1) /
700			    lp->d_secpercyl - 1));
701			if (pp->p_size % lp->d_secpercyl)
702			    putc('*', f);
703			fprintf(f, ")\n");
704		}
705	}
706	fflush(f);
707}
708
709int
710edit(struct disklabel *lp, int f)
711{
712	int c, fd;
713	struct disklabel label;
714	FILE *fp;
715
716	if ((fd = mkstemp(tmpfil)) == -1 ||
717	    (fp = fdopen(fd, "w")) == NULL) {
718		warnx("can't create %s", tmpfil);
719		return (1);
720	}
721	display(fp, lp);
722	fclose(fp);
723	for (;;) {
724		if (!editit())
725			break;
726		fp = fopen(tmpfil, "r");
727		if (fp == NULL) {
728			warnx("can't reopen %s for reading", tmpfil);
729			break;
730		}
731		bzero((char *)&label, sizeof(label));
732		if (getasciilabel(fp, &label)) {
733			*lp = label;
734			if (writelabel(f, bootarea, lp) == 0) {
735				fclose(fp);
736				(void) unlink(tmpfil);
737				return (0);
738			}
739		}
740		fclose(fp);
741		printf("re-edit the label? [y]: "); fflush(stdout);
742		c = getchar();
743		if (c != EOF && c != (int)'\n')
744			while (getchar() != (int)'\n')
745				;
746		if  (c == (int)'n')
747			break;
748	}
749	(void) unlink(tmpfil);
750	return (1);
751}
752
753int
754editit(void)
755{
756	int pid, xpid;
757	int locstat, omask;
758	const char *ed;
759
760	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
761	while ((pid = fork()) < 0) {
762		if (errno == EPROCLIM) {
763			warnx("you have too many processes");
764			return(0);
765		}
766		if (errno != EAGAIN) {
767			warn("fork");
768			return(0);
769		}
770		sleep(1);
771	}
772	if (pid == 0) {
773		sigsetmask(omask);
774		setgid(getgid());
775		setuid(getuid());
776		if ((ed = getenv("EDITOR")) == (char *)0)
777			ed = DEFEDITOR;
778		execlp(ed, ed, tmpfil, (char *)0);
779		err(1, "%s", ed);
780	}
781	while ((xpid = wait(&locstat)) >= 0)
782		if (xpid == pid)
783			break;
784	sigsetmask(omask);
785	return(!locstat);
786}
787
788char *
789skip(char *cp)
790{
791
792	while (*cp != '\0' && isspace(*cp))
793		cp++;
794	if (*cp == '\0' || *cp == '#')
795		return (NULL);
796	return (cp);
797}
798
799char *
800word(char *cp)
801{
802	char c;
803
804	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
805		cp++;
806	if ((c = *cp) != '\0') {
807		*cp++ = '\0';
808		if (c != '#')
809			return (skip(cp));
810	}
811	return (NULL);
812}
813
814/*
815 * Read an ascii label in from fd f,
816 * in the same format as that put out by display(),
817 * and fill in lp.
818 */
819int
820getasciilabel(FILE *f, struct disklabel *lp)
821{
822	char *cp;
823	const char **cpp;
824	u_int part;
825	char *tp, line[BUFSIZ];
826	u_long v;
827	int lineno = 0, errors = 0;
828	int i;
829
830	bzero(&part_set, sizeof(part_set));
831	bzero(&part_size_type, sizeof(part_size_type));
832	bzero(&part_offset_type, sizeof(part_offset_type));
833	lp->d_bbsize = BBSIZE;				/* XXX */
834	lp->d_sbsize = 0;				/* XXX */
835	while (fgets(line, sizeof(line) - 1, f)) {
836		lineno++;
837		if ((cp = index(line,'\n')) != 0)
838			*cp = '\0';
839		cp = skip(line);
840		if (cp == NULL)
841			continue;
842		tp = index(cp, ':');
843		if (tp == NULL) {
844			fprintf(stderr, "line %d: syntax error\n", lineno);
845			errors++;
846			continue;
847		}
848		*tp++ = '\0', tp = skip(tp);
849		if (streq(cp, "type")) {
850			if (tp == NULL)
851				tp = unknown;
852			cpp = dktypenames;
853			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
854				if (*cpp && streq(*cpp, tp)) {
855					lp->d_type = cpp - dktypenames;
856					break;
857				}
858			if (cpp < &dktypenames[DKMAXTYPES])
859				continue;
860			v = strtoul(tp, NULL, 10);
861			if (v >= DKMAXTYPES)
862				fprintf(stderr, "line %d:%s %lu\n", lineno,
863				    "Warning, unknown disk type", v);
864			lp->d_type = v;
865			continue;
866		}
867		if (streq(cp, "flags")) {
868			for (v = 0; (cp = tp) && *cp != '\0';) {
869				tp = word(cp);
870				if (streq(cp, "removeable"))
871					v |= D_REMOVABLE;
872				else if (streq(cp, "ecc"))
873					v |= D_ECC;
874				else if (streq(cp, "badsect"))
875					v |= D_BADSECT;
876				else {
877					fprintf(stderr,
878					    "line %d: %s: bad flag\n",
879					    lineno, cp);
880					errors++;
881				}
882			}
883			lp->d_flags = v;
884			continue;
885		}
886		if (streq(cp, "drivedata")) {
887			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
888				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
889				tp = word(cp);
890			}
891			continue;
892		}
893		if (sscanf(cp, "%lu partitions", &v) == 1) {
894			if (v == 0 || v > MAXPARTITIONS) {
895				fprintf(stderr,
896				    "line %d: bad # of partitions\n", lineno);
897				lp->d_npartitions = MAXPARTITIONS;
898				errors++;
899			} else
900				lp->d_npartitions = v;
901			continue;
902		}
903		if (tp == NULL)
904			tp = blank;
905		if (streq(cp, "disk")) {
906			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
907			continue;
908		}
909		if (streq(cp, "label")) {
910			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
911			continue;
912		}
913		if (streq(cp, "bytes/sector")) {
914			v = strtoul(tp, NULL, 10);
915			if (v == 0 || (v % DEV_BSIZE) != 0) {
916				fprintf(stderr,
917				    "line %d: %s: bad sector size\n",
918				    lineno, tp);
919				errors++;
920			} else
921				lp->d_secsize = v;
922			continue;
923		}
924		if (streq(cp, "sectors/track")) {
925			v = strtoul(tp, NULL, 10);
926#if (ULONG_MAX != 0xffffffffUL)
927			if (v == 0 || v > 0xffffffff) {
928#else
929			if (v == 0) {
930#endif
931				fprintf(stderr, "line %d: %s: bad %s\n",
932				    lineno, tp, cp);
933				errors++;
934			} else
935				lp->d_nsectors = v;
936			continue;
937		}
938		if (streq(cp, "sectors/cylinder")) {
939			v = strtoul(tp, NULL, 10);
940			if (v == 0) {
941				fprintf(stderr, "line %d: %s: bad %s\n",
942				    lineno, tp, cp);
943				errors++;
944			} else
945				lp->d_secpercyl = v;
946			continue;
947		}
948		if (streq(cp, "tracks/cylinder")) {
949			v = strtoul(tp, NULL, 10);
950			if (v == 0) {
951				fprintf(stderr, "line %d: %s: bad %s\n",
952				    lineno, tp, cp);
953				errors++;
954			} else
955				lp->d_ntracks = v;
956			continue;
957		}
958		if (streq(cp, "cylinders")) {
959			v = strtoul(tp, NULL, 10);
960			if (v == 0) {
961				fprintf(stderr, "line %d: %s: bad %s\n",
962				    lineno, tp, cp);
963				errors++;
964			} else
965				lp->d_ncylinders = v;
966			continue;
967		}
968		if (streq(cp, "sectors/unit")) {
969			v = strtoul(tp, NULL, 10);
970			if (v == 0) {
971				fprintf(stderr, "line %d: %s: bad %s\n",
972				    lineno, tp, cp);
973				errors++;
974			} else
975				lp->d_secperunit = v;
976			continue;
977		}
978		if (streq(cp, "rpm")) {
979			v = strtoul(tp, NULL, 10);
980			if (v == 0 || v > USHRT_MAX) {
981				fprintf(stderr, "line %d: %s: bad %s\n",
982				    lineno, tp, cp);
983				errors++;
984			} else
985				lp->d_rpm = v;
986			continue;
987		}
988		if (streq(cp, "interleave")) {
989			v = strtoul(tp, NULL, 10);
990			if (v == 0 || v > USHRT_MAX) {
991				fprintf(stderr, "line %d: %s: bad %s\n",
992				    lineno, tp, cp);
993				errors++;
994			} else
995				lp->d_interleave = v;
996			continue;
997		}
998		if (streq(cp, "trackskew")) {
999			v = strtoul(tp, NULL, 10);
1000			if (v > USHRT_MAX) {
1001				fprintf(stderr, "line %d: %s: bad %s\n",
1002				    lineno, tp, cp);
1003				errors++;
1004			} else
1005				lp->d_trackskew = v;
1006			continue;
1007		}
1008		if (streq(cp, "cylinderskew")) {
1009			v = strtoul(tp, NULL, 10);
1010			if (v > USHRT_MAX) {
1011				fprintf(stderr, "line %d: %s: bad %s\n",
1012				    lineno, tp, cp);
1013				errors++;
1014			} else
1015				lp->d_cylskew = v;
1016			continue;
1017		}
1018		if (streq(cp, "headswitch")) {
1019			v = strtoul(tp, NULL, 10);
1020			lp->d_headswitch = v;
1021			continue;
1022		}
1023		if (streq(cp, "track-to-track seek")) {
1024			v = strtoul(tp, NULL, 10);
1025			lp->d_trkseek = v;
1026			continue;
1027		}
1028		/* the ':' was removed above */
1029		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
1030			fprintf(stderr,
1031			    "line %d: %s: Unknown disklabel field\n", lineno,
1032			    cp);
1033			errors++;
1034			continue;
1035		}
1036
1037		/* Process a partition specification line. */
1038		part = *cp - 'a';
1039		if (part >= lp->d_npartitions) {
1040			fprintf(stderr,
1041			    "line %d: partition name out of range a-%c: %s\n",
1042			    lineno, 'a' + lp->d_npartitions - 1, cp);
1043			errors++;
1044			continue;
1045		}
1046		part_set[part] = 1;
1047
1048		if (getasciipartspec(tp, lp, part, lineno) != 0) {
1049			errors++;
1050			break;
1051		}
1052	}
1053	errors += checklabel(lp);
1054	return (errors == 0);
1055}
1056
1057#define NXTNUM(n) do { \
1058	if (tp == NULL) { \
1059		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1060		return (1); \
1061	} else { \
1062		cp = tp, tp = word(cp); \
1063		(n) = strtoul(cp, NULL, 10); \
1064	} \
1065} while (0)
1066
1067/* retain 1 character following number */
1068#define NXTWORD(w,n) do { \
1069	if (tp == NULL) { \
1070		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1071		return (1); \
1072	} else { \
1073	        char *tmp; \
1074		cp = tp, tp = word(cp); \
1075	        (n) = strtoul(cp, &tmp, 10); \
1076		if (tmp) (w) = *tmp; \
1077	} \
1078} while (0)
1079
1080/*
1081 * Read a partition line into partition `part' in the specified disklabel.
1082 * Return 0 on success, 1 on failure.
1083 */
1084int
1085getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1086{
1087	struct partition *pp;
1088	char *cp;
1089	const char **cpp;
1090	u_long v;
1091
1092	pp = &lp->d_partitions[part];
1093	cp = NULL;
1094
1095	v = 0;
1096	NXTWORD(part_size_type[part],v);
1097	if (v == 0 && part_size_type[part] != '*') {
1098		fprintf(stderr,
1099		    "line %d: %s: bad partition size\n", lineno, cp);
1100		return (1);
1101	}
1102	pp->p_size = v;
1103
1104	v = 0;
1105	NXTWORD(part_offset_type[part],v);
1106	if (v == 0 && part_offset_type[part] != '*' &&
1107	    part_offset_type[part] != '\0') {
1108		fprintf(stderr,
1109		    "line %d: %s: bad partition offset\n", lineno, cp);
1110		return (1);
1111	}
1112	pp->p_offset = v;
1113	if (tp == NULL) {
1114		fprintf(stderr, "line %d: missing file system type\n", lineno);
1115		return (1);
1116	}
1117	cp = tp, tp = word(cp);
1118	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1119		if (*cpp && streq(*cpp, cp))
1120			break;
1121	if (*cpp != NULL) {
1122		pp->p_fstype = cpp - fstypenames;
1123	} else {
1124		if (isdigit(*cp))
1125			v = strtoul(cp, NULL, 10);
1126		else
1127			v = FSMAXTYPES;
1128		if (v >= FSMAXTYPES) {
1129			fprintf(stderr,
1130			    "line %d: Warning, unknown file system type %s\n",
1131			    lineno, cp);
1132			v = FS_UNUSED;
1133		}
1134		pp->p_fstype = v;
1135	}
1136
1137	switch (pp->p_fstype) {
1138	case FS_UNUSED:
1139		/*
1140		 * allow us to accept defaults for
1141		 * fsize/frag/cpg
1142		 */
1143		if (tp) {
1144			NXTNUM(pp->p_fsize);
1145			if (pp->p_fsize == 0)
1146				break;
1147			NXTNUM(v);
1148			pp->p_frag = v / pp->p_fsize;
1149		}
1150		/* else default to 0's */
1151		break;
1152
1153	/* These happen to be the same */
1154	case FS_BSDFFS:
1155	case FS_BSDLFS:
1156		if (tp) {
1157			NXTNUM(pp->p_fsize);
1158			if (pp->p_fsize == 0)
1159				break;
1160			NXTNUM(v);
1161			pp->p_frag = v / pp->p_fsize;
1162			NXTNUM(pp->p_cpg);
1163		} else {
1164			/*
1165			 * FIX! poor attempt at adaptive
1166			 */
1167			/* 1 GB */
1168			if (pp->p_size < 1024*1024*1024 / lp->d_secsize) {
1169				/*
1170				 * FIX! These are too low, but are traditional
1171				 */
1172				pp->p_fsize = DEFAULT_NEWFS_FRAG;
1173				pp->p_frag = DEFAULT_NEWFS_BLOCK /
1174				    DEFAULT_NEWFS_FRAG;
1175				pp->p_cpg = DEFAULT_NEWFS_CPG;
1176			} else {
1177				pp->p_fsize = BIG_NEWFS_FRAG;
1178				pp->p_frag = BIG_NEWFS_BLOCK /
1179				    BIG_NEWFS_FRAG;
1180				pp->p_cpg = BIG_NEWFS_CPG;
1181			}
1182		}
1183	default:
1184		break;
1185	}
1186	return (0);
1187}
1188
1189/*
1190 * Check disklabel for errors and fill in
1191 * derived fields according to supplied values.
1192 */
1193int
1194checklabel(struct disklabel *lp)
1195{
1196	struct partition *pp;
1197	int i, errors = 0;
1198	char part;
1199	u_long total_size, total_percent, current_offset;
1200	int seen_default_offset;
1201	int hog_part;
1202	int j;
1203	struct partition *pp2;
1204
1205	if (lp->d_secsize == 0) {
1206		fprintf(stderr, "sector size 0\n");
1207		return (1);
1208	}
1209	if (lp->d_nsectors == 0) {
1210		fprintf(stderr, "sectors/track 0\n");
1211		return (1);
1212	}
1213	if (lp->d_ntracks == 0) {
1214		fprintf(stderr, "tracks/cylinder 0\n");
1215		return (1);
1216	}
1217	if  (lp->d_ncylinders == 0) {
1218		fprintf(stderr, "cylinders/unit 0\n");
1219		errors++;
1220	}
1221	if (lp->d_rpm == 0)
1222		Warning("revolutions/minute 0");
1223	if (lp->d_secpercyl == 0)
1224		lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1225	if (lp->d_secperunit == 0)
1226		lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1227	if (lp->d_bbsize == 0) {
1228		fprintf(stderr, "boot block size 0\n");
1229		errors++;
1230	} else if (lp->d_bbsize % lp->d_secsize)
1231		Warning("boot block size %% sector-size != 0");
1232	if (lp->d_npartitions > MAXPARTITIONS)
1233		Warning("number of partitions (%lu) > MAXPARTITIONS (%d)",
1234		    (u_long)lp->d_npartitions, MAXPARTITIONS);
1235
1236	/* first allocate space to the partitions, then offsets */
1237	total_size = 0; /* in sectors */
1238	total_percent = 0; /* in percent */
1239	hog_part = -1;
1240	/* find all fixed partitions */
1241	for (i = 0; i < lp->d_npartitions; i++) {
1242		pp = &lp->d_partitions[i];
1243		if (part_set[i]) {
1244			if (part_size_type[i] == '*') {
1245				if (i == RAW_PART) {
1246					pp->p_size = lp->d_secperunit;
1247				} else {
1248					if (hog_part != -1)
1249						Warning("Too many '*' partitions (%c and %c)",
1250						    hog_part + 'a',i + 'a');
1251					else
1252						hog_part = i;
1253				}
1254			} else {
1255				off_t size;
1256
1257				size = pp->p_size;
1258				switch (part_size_type[i]) {
1259				case '%':
1260					total_percent += size;
1261					break;
1262				case 'k':
1263				case 'K':
1264					size *= 1024ULL;
1265					break;
1266				case 'm':
1267				case 'M':
1268					size *= 1024ULL * 1024ULL;
1269					break;
1270				case 'g':
1271				case 'G':
1272					size *= 1024ULL * 1024ULL * 1024ULL;
1273					break;
1274				case '\0':
1275					break;
1276				default:
1277					Warning("unknown size specifier '%c' (K/M/G are valid)",part_size_type[i]);
1278					break;
1279				}
1280				/* don't count %'s yet */
1281				if (part_size_type[i] != '%') {
1282					/*
1283					 * for all not in sectors, convert to
1284					 * sectors
1285					 */
1286					if (part_size_type[i] != '\0') {
1287						if (size % lp->d_secsize != 0)
1288							Warning("partition %c not an integer number of sectors",
1289							    i + 'a');
1290						size /= lp->d_secsize;
1291						pp->p_size = size;
1292					}
1293					/* else already in sectors */
1294					if (i != RAW_PART)
1295						total_size += size;
1296				}
1297			}
1298		}
1299	}
1300	/* handle % partitions - note %'s don't need to add up to 100! */
1301	if (total_percent != 0) {
1302		long free_space = lp->d_secperunit - total_size;
1303		if (total_percent > 100) {
1304			fprintf(stderr,"total percentage %lu is greater than 100\n",
1305			    total_percent);
1306			errors++;
1307		}
1308
1309		if (free_space > 0) {
1310			for (i = 0; i < lp->d_npartitions; i++) {
1311				pp = &lp->d_partitions[i];
1312				if (part_set[i] && part_size_type[i] == '%') {
1313					/* careful of overflows! and integer roundoff */
1314					pp->p_size = ((double)pp->p_size/100) * free_space;
1315					total_size += pp->p_size;
1316
1317					/* FIX we can lose a sector or so due to roundoff per
1318					   partition.  A more complex algorithm could avoid that */
1319				}
1320			}
1321		} else {
1322			fprintf(stderr,
1323			    "%ld sectors available to give to '*' and '%%' partitions\n",
1324			    free_space);
1325			errors++;
1326			/* fix?  set all % partitions to size 0? */
1327		}
1328	}
1329	/* give anything remaining to the hog partition */
1330	if (hog_part != -1) {
1331		lp->d_partitions[hog_part].p_size = lp->d_secperunit - total_size;
1332		total_size = lp->d_secperunit;
1333	}
1334
1335	/* Now set the offsets for each partition */
1336	current_offset = 0; /* in sectors */
1337	seen_default_offset = 0;
1338	for (i = 0; i < lp->d_npartitions; i++) {
1339		part = 'a' + i;
1340		pp = &lp->d_partitions[i];
1341		if (part_set[i]) {
1342			if (part_offset_type[i] == '*') {
1343				if (i == RAW_PART) {
1344					pp->p_offset = 0;
1345				} else {
1346					pp->p_offset = current_offset;
1347					seen_default_offset = 1;
1348				}
1349			} else {
1350				/* allow them to be out of order for old-style tables */
1351				if (pp->p_offset < current_offset &&
1352				    seen_default_offset && i != RAW_PART &&
1353				    pp->p_fstype != FS_VINUM) {
1354					fprintf(stderr,
1355"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1356					    (long)pp->p_offset,i+'a',current_offset);
1357					fprintf(stderr,
1358"Labels with any *'s for offset must be in ascending order by sector\n");
1359					errors++;
1360				} else if (pp->p_offset != current_offset &&
1361				    i != RAW_PART && seen_default_offset) {
1362					/*
1363					 * this may give unneeded warnings if
1364					 * partitions are out-of-order
1365					 */
1366					Warning(
1367"Offset %ld for partition %c doesn't match expected value %ld",
1368					    (long)pp->p_offset, i + 'a', current_offset);
1369				}
1370			}
1371			if (i != RAW_PART)
1372				current_offset = pp->p_offset + pp->p_size;
1373		}
1374	}
1375
1376	for (i = 0; i < lp->d_npartitions; i++) {
1377		part = 'a' + i;
1378		pp = &lp->d_partitions[i];
1379		if (pp->p_size == 0 && pp->p_offset != 0)
1380			Warning("partition %c: size 0, but offset %lu",
1381			    part, (u_long)pp->p_offset);
1382#ifdef notdef
1383		if (pp->p_size % lp->d_secpercyl)
1384			Warning("partition %c: size %% cylinder-size != 0",
1385			    part);
1386		if (pp->p_offset % lp->d_secpercyl)
1387			Warning("partition %c: offset %% cylinder-size != 0",
1388			    part);
1389#endif
1390		if (pp->p_offset > lp->d_secperunit) {
1391			fprintf(stderr,
1392			    "partition %c: offset past end of unit\n", part);
1393			errors++;
1394		}
1395		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1396			fprintf(stderr,
1397			"partition %c: partition extends past end of unit\n",
1398			    part);
1399			errors++;
1400		}
1401		if (i == RAW_PART)
1402		{
1403			if (pp->p_fstype != FS_UNUSED)
1404				Warning("partition %c is not marked as unused!",part);
1405			if (pp->p_offset != 0)
1406				Warning("partition %c doesn't start at 0!",part);
1407			if (pp->p_size != lp->d_secperunit)
1408				Warning("partition %c doesn't cover the whole unit!",part);
1409
1410			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1411			    (pp->p_size != lp->d_secperunit)) {
1412				Warning("An incorrect partition %c may cause problems for "
1413				    "standard system utilities",part);
1414			}
1415		}
1416
1417		/* check for overlaps */
1418		/* this will check for all possible overlaps once and only once */
1419		for (j = 0; j < i; j++) {
1420			pp2 = &lp->d_partitions[j];
1421			if (j != RAW_PART && i != RAW_PART &&
1422			    pp->p_fstype != FS_VINUM &&
1423			    pp2->p_fstype != FS_VINUM &&
1424			    part_set[i] && part_set[j]) {
1425				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1426				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1427					pp2->p_offset >= pp->p_offset)) {
1428					fprintf(stderr,"partitions %c and %c overlap!\n",
1429					    j + 'a', i + 'a');
1430					errors++;
1431				}
1432			}
1433		}
1434	}
1435	for (; i < MAXPARTITIONS; i++) {
1436		part = 'a' + i;
1437		pp = &lp->d_partitions[i];
1438		if (pp->p_size || pp->p_offset)
1439			Warning("unused partition %c: size %d offset %lu",
1440			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1441	}
1442	return (errors);
1443}
1444
1445/*
1446 * When operating on a "virgin" disk, try getting an initial label
1447 * from the associated device driver.  This might work for all device
1448 * drivers that are able to fetch some initial device parameters
1449 * without even having access to a (BSD) disklabel, like SCSI disks,
1450 * most IDE drives, or vn devices.
1451 *
1452 * The device name must be given in its "canonical" form.
1453 */
1454struct disklabel *
1455getvirginlabel(void)
1456{
1457	static struct disklabel loclab;
1458	struct partition *dp;
1459	char lnamebuf[BBSIZE];
1460	int f;
1461	u_int secsize, u;
1462	off_t mediasize;
1463
1464	if (dkname[0] == '/') {
1465		warnx("\"auto\" requires the usage of a canonical disk name");
1466		return (NULL);
1467	}
1468	(void)snprintf(lnamebuf, BBSIZE, "%s%s", _PATH_DEV, dkname);
1469	if ((f = open(lnamebuf, O_RDONLY)) == -1) {
1470		warn("cannot open %s", lnamebuf);
1471		return (NULL);
1472	}
1473
1474	/* New world order */
1475	if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
1476	    (ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
1477		close (f);
1478		return (NULL);
1479	}
1480	memset(&loclab, 0, sizeof loclab);
1481	loclab.d_magic = DISKMAGIC;
1482	loclab.d_magic2 = DISKMAGIC;
1483	loclab.d_secsize = secsize;
1484	loclab.d_secperunit = mediasize / secsize;
1485
1486	/*
1487	 * Nobody in these enligthened days uses the CHS geometry for
1488	 * anything, but nontheless try to get it right.  If we fail
1489	 * to get any good ideas from the device, construct something
1490	 * which is IBM-PC friendly.
1491	 */
1492	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1493		loclab.d_nsectors = u;
1494	else
1495		loclab.d_nsectors = 63;
1496	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1497		loclab.d_ntracks = u;
1498	else if (loclab.d_secperunit <= 63*1*1024)
1499		loclab.d_ntracks = 1;
1500	else if (loclab.d_secperunit <= 63*16*1024)
1501		loclab.d_ntracks = 16;
1502	else
1503		loclab.d_ntracks = 255;
1504	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1505	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1506	loclab.d_npartitions = MAXPARTITIONS;
1507
1508	/* Various (unneeded) compat stuff */
1509	loclab.d_rpm = 3600;
1510	loclab.d_bbsize = BBSIZE;
1511	loclab.d_interleave = 1;;
1512	strncpy(loclab.d_typename, "amnesiac",
1513	    sizeof(loclab.d_typename));
1514
1515	dp = &loclab.d_partitions[RAW_PART];
1516	dp->p_size = loclab.d_secperunit;
1517	loclab.d_checksum = dkcksum(&loclab);
1518	close (f);
1519	return (&loclab);
1520}
1521
1522
1523/*VARARGS1*/
1524void
1525Warning(const char *fmt, ...)
1526{
1527	va_list ap;
1528
1529	fprintf(stderr, "Warning, ");
1530	va_start(ap, fmt);
1531	vfprintf(stderr, fmt, ap);
1532	fprintf(stderr, "\n");
1533	va_end(ap);
1534}
1535
1536void
1537usage(void)
1538{
1539
1540	fprintf(stderr,
1541	"%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",
1542	"usage: bsdlabel [-r] disk",
1543	"\t\t(to read label)",
1544	"	bsdlabel -w [-nr] [-m machine] disk type [packid]",
1545	"\t\t(to write label with existing boot program)",
1546	"	bsdlabel -e [-nr] [-m machine] disk",
1547	"\t\t(to edit label)",
1548	"	bsdlabel -R [-nr] [-m machine] disk protofile",
1549	"\t\t(to restore label with existing boot program)",
1550	"	bsdlabel -B [-b boot] [-m machine] disk",
1551	"\t\t(to install boot program with existing on-disk label)",
1552	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk type [packid]",
1553	"\t\t(to write label and install boot program)",
1554	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1555		"\t\t(to restore label and install boot program)"
1556	);
1557	exit(1);
1558}
1559