bsdlabel.c revision 109875 
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 109875 2003-01-26 11:28:34Z 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#ifdef PC98
68#include <sys/diskpc98.h>
69#else
70#include <sys/diskmbr.h>
71#endif
72#ifdef __sparc64__
73#include <sys/sun_disklabel.h>
74#endif
75
76#include <unistd.h>
77#include <string.h>
78#include <stdio.h>
79#include <stdlib.h>
80#include <signal.h>
81#include <stdarg.h>
82#include <ctype.h>
83#include <err.h>
84#include <errno.h>
85
86#include "pathnames.h"
87
88/*
89 * Disklabel: read and write disklabels.
90 * The label is usually placed on one of the first sectors of the disk.
91 * Many machines also place a bootstrap in the same area,
92 * in which case the label is embedded in the bootstrap.
93 * The bootstrap source must leave space at the proper offset
94 * for the label on such machines.
95 */
96
97#ifndef BBSIZE
98#define	BBSIZE	8192			/* size of boot area, with label */
99#endif
100
101/* FIX!  These are too low, but are traditional */
102#define DEFAULT_NEWFS_BLOCK  8192U
103#define DEFAULT_NEWFS_FRAG   1024U
104#define DEFAULT_NEWFS_CPG    16U
105
106#define BIG_NEWFS_BLOCK  16384U
107#define BIG_NEWFS_FRAG   2048U
108#define BIG_NEWFS_CPG    64U
109
110#if defined(__i386__) || defined(__ia64__)
111#define	NUMBOOT	2
112#elif defined(__alpha__) || defined(__sparc64__) || defined(__powerpc__)
113#define	NUMBOOT	1
114#else
115#error	I do not know about this architecture.
116#endif
117
118void	makelabel(const char *, const char *, struct disklabel *);
119int	writelabel(int, const char *, struct disklabel *);
120void	l_perror(const char *);
121struct disklabel *readlabel(int);
122struct disklabel *makebootarea(char *, struct disklabel *, int);
123void	display(FILE *, const struct disklabel *);
124int	edit(struct disklabel *, int);
125int	editit(void);
126char	*skip(char *);
127char	*word(char *);
128int	getasciilabel(FILE *, struct disklabel *);
129int	getasciipartspec(char *, struct disklabel *, int, int);
130int	checklabel(struct disklabel *);
131void	setbootflag(struct disklabel *);
132void	Warning(const char *, ...) __printflike(1, 2);
133void	usage(void);
134struct disklabel *getvirginlabel(void);
135
136#define	DEFEDITOR	_PATH_VI
137#define	streq(a,b)	(strcmp(a,b) == 0)
138
139char	*dkname;
140char	*specname;
141char	tmpfil[] = PATH_TMPFILE;
142
143char	namebuf[BBSIZE], *np = namebuf;
144struct	disklabel lab;
145char	bootarea[BBSIZE];
146char	blank[] = "";
147char	unknown[] = "unknown";
148
149#define MAX_PART ('z')
150#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
151char    part_size_type[MAX_NUM_PARTS];
152char    part_offset_type[MAX_NUM_PARTS];
153int     part_set[MAX_NUM_PARTS];
154
155#if NUMBOOT > 0
156int	installboot;	/* non-zero if we should install a boot program */
157char	*bootbuf;	/* pointer to buffer with remainder of boot prog */
158int	bootsize;	/* size of remaining boot program */
159char	*xxboot;	/* primary boot */
160char	*bootxx;	/* secondary boot */
161char	boot0[MAXPATHLEN];
162char	boot1[MAXPATHLEN];
163#endif
164
165enum	{
166	UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
167} op = UNSPEC;
168
169int	rflag;
170int	disable_write;   /* set to disable writing to disk label */
171
172#define OPTIONS	"BRb:enrs:w"
173
174int
175main(int argc, char *argv[])
176{
177	struct disklabel *lp;
178	FILE *t;
179	int ch, f = 0, error = 0;
180	char *name = 0;
181
182	while ((ch = getopt(argc, argv, OPTIONS)) != -1)
183		switch (ch) {
184#if NUMBOOT > 0
185			case 'B':
186				++installboot;
187				break;
188			case 'b':
189				xxboot = optarg;
190				break;
191#if NUMBOOT > 1
192			case 's':
193				bootxx = optarg;
194				break;
195#endif
196#endif
197			case 'n':
198				disable_write = 1;
199				break;
200			case 'R':
201				if (op != UNSPEC)
202					usage();
203				op = RESTORE;
204				break;
205			case 'e':
206				if (op != UNSPEC)
207					usage();
208				op = EDIT;
209				break;
210			case 'r':
211				++rflag;
212				break;
213			case 'w':
214				if (op != UNSPEC)
215					usage();
216				op = WRITE;
217				break;
218			case '?':
219			default:
220				usage();
221		}
222	argc -= optind;
223	argv += optind;
224#if NUMBOOT > 0
225	if (installboot) {
226		rflag++;
227		if (op == UNSPEC)
228			op = WRITEBOOT;
229	} else {
230		if (op == UNSPEC)
231			op = READ;
232		xxboot = bootxx = 0;
233	}
234#else
235	if (op == UNSPEC)
236		op = READ;
237#endif
238	if (argc < 1)
239		usage();
240
241	dkname = argv[0];
242	if (dkname[0] != '/') {
243		(void)sprintf(np, "%s%s%c", _PATH_DEV, dkname, 'a' + RAW_PART);
244		specname = np;
245		np += strlen(specname) + 1;
246	} else
247		specname = dkname;
248	f = open(specname, op == READ ? O_RDONLY : O_RDWR);
249	if (f < 0 && errno == ENOENT && dkname[0] != '/') {
250		(void)sprintf(specname, "%s%s", _PATH_DEV, dkname);
251		np = namebuf + strlen(specname) + 1;
252		f = open(specname, op == READ ? O_RDONLY : O_RDWR);
253	}
254	if (f < 0)
255		err(4, "%s", specname);
256
257	switch(op) {
258
259	case UNSPEC:
260		break;
261
262	case EDIT:
263		if (argc != 1)
264			usage();
265		lp = readlabel(f);
266		error = edit(lp, f);
267		break;
268
269	case READ:
270		if (argc != 1)
271			usage();
272		lp = readlabel(f);
273		display(stdout, lp);
274		error = checklabel(lp);
275		break;
276
277	case RESTORE:
278#if NUMBOOT > 0
279		if (installboot && argc == 3) {
280			makelabel(argv[2], 0, &lab);
281			argc--;
282
283			/*
284			 * We only called makelabel() for its side effect
285			 * of setting the bootstrap file names.  Discard
286			 * all changes to `lab' so that all values in the
287			 * final label come from the ASCII label.
288			 */
289			bzero((char *)&lab, sizeof(lab));
290		}
291#endif
292		if (argc != 2)
293			usage();
294		if (!(t = fopen(argv[1], "r")))
295			err(4, "%s", argv[1]);
296		if (!getasciilabel(t, &lab))
297			exit(1);
298		lp = makebootarea(bootarea, &lab, f);
299		*lp = lab;
300		error = writelabel(f, bootarea, lp);
301		break;
302
303	case WRITE:
304		if (argc == 3) {
305			name = argv[2];
306			argc--;
307		}
308		if (argc != 2)
309			usage();
310		makelabel(argv[1], name, &lab);
311		lp = makebootarea(bootarea, &lab, f);
312		*lp = lab;
313		if (checklabel(lp) == 0)
314			error = writelabel(f, bootarea, lp);
315		break;
316
317#if NUMBOOT > 0
318	case WRITEBOOT:
319	{
320		struct disklabel tlab;
321
322		lp = readlabel(f);
323		tlab = *lp;
324		if (argc == 2)
325			makelabel(argv[1], 0, &lab);
326		lp = makebootarea(bootarea, &lab, f);
327		*lp = tlab;
328		if (checklabel(lp) == 0)
329			error = writelabel(f, bootarea, lp);
330		break;
331	}
332#endif
333	}
334	exit(error);
335}
336
337/*
338 * Construct a prototype disklabel from /etc/disktab.  As a side
339 * effect, set the names of the primary and secondary boot files
340 * if specified.
341 */
342void
343makelabel(const char *type, const char *name, struct disklabel *lp)
344{
345	struct disklabel *dp;
346
347	if (strcmp(type, "auto") == 0)
348		dp = getvirginlabel();
349	else
350		dp = getdiskbyname(type);
351	if (dp == NULL)
352		errx(1, "%s: unknown disk type", type);
353	*lp = *dp;
354	bzero(lp->d_packname, sizeof(lp->d_packname));
355	if (name)
356		(void)strncpy(lp->d_packname, name, sizeof(lp->d_packname));
357}
358
359int
360writelabel(int f, const char *boot, struct disklabel *lp)
361{
362	int flag;
363#ifdef __alpha__
364	u_long *p, sum;
365	int i;
366#endif
367#ifdef __sparc64__
368	struct sun_disklabel *sl;
369	u_short cksum, *sp1, *sp2;
370	struct partition *npp;
371	struct sun_dkpart *spp;
372	int i, secpercyl;
373#endif
374
375	if (disable_write) {
376		Warning("write to disk label supressed - label was as follows:");
377		display(stdout, lp);
378		return (0);
379	} else {
380		setbootflag(lp);
381		lp->d_magic = DISKMAGIC;
382		lp->d_magic2 = DISKMAGIC;
383		lp->d_checksum = 0;
384		lp->d_checksum = dkcksum(lp);
385		if (rflag) {
386			/*
387			 * First set the kernel disk label,
388			 * then write a label to the raw disk.
389			 * If the SDINFO ioctl fails because it is unimplemented,
390			 * keep going; otherwise, the kernel consistency checks
391			 * may prevent us from changing the current (in-core)
392			 * label.
393			 */
394			if (ioctl(f, DIOCSDINFO, lp) < 0 &&
395				errno != ENODEV && errno != ENOTTY) {
396				l_perror("ioctl DIOCSDINFO");
397				return (1);
398			}
399			(void)lseek(f, (off_t)0, SEEK_SET);
400
401#ifdef __alpha__
402			/*
403			 * Generate the bootblock checksum for the SRM console.
404			 */
405			for (p = (u_long *)boot, i = 0, sum = 0; i < 63; i++)
406				sum += p[i];
407			p[63] = sum;
408#endif
409#ifdef __sparc64__
410			/*
411			 * Generate a Sun disklabel around the BSD label for
412			 * PROM compatability.
413			 */
414			sl = (struct sun_disklabel *)boot;
415			memcpy(sl->sl_text, lp->d_packname, sizeof(lp->d_packname));
416			sl->sl_rpm = lp->d_rpm;
417			sl->sl_pcylinders = lp->d_ncylinders +
418			    lp->d_acylinders; /* XXX */
419			sl->sl_sparespercyl = lp->d_sparespercyl;
420			sl->sl_interleave = lp->d_interleave;
421			sl->sl_ncylinders = lp->d_ncylinders;
422			sl->sl_acylinders = lp->d_acylinders;
423			sl->sl_ntracks = lp->d_ntracks;
424			sl->sl_nsectors = lp->d_nsectors;
425			sl->sl_magic = SUN_DKMAGIC;
426			secpercyl = sl->sl_nsectors * sl->sl_ntracks;
427			for (i = 0; i < 8; i++) {
428				spp = &sl->sl_part[i];
429				npp = &lp->d_partitions[i];
430				/*
431				 * SunOS partitions must start on a cylinder
432				 * boundary. Note this restriction is forced
433				 * upon FreeBSD/sparc64 labels too, since we
434				 * want to keep both labels synchronised.
435				 */
436				spp->sdkp_cyloffset = npp->p_offset / secpercyl;
437				spp->sdkp_nsectors = npp->p_size;
438			}
439
440			/* Compute the XOR checksum. */
441			sp1 = (u_short *)sl;
442			sp2 = (u_short *)(sl + 1);
443			sl->sl_cksum = cksum = 0;
444			while (sp1 < sp2)
445				cksum ^= *sp1++;
446			sl->sl_cksum = cksum;
447#endif
448			if (write(f, boot, lp->d_bbsize) != (int)lp->d_bbsize) {
449				warn("write");
450				return (1);
451			}
452#if NUMBOOT > 0
453			/*
454			 * Output the remainder of the disklabel
455			 */
456			if (bootbuf && write(f, bootbuf, bootsize) != bootsize) {
457				warn("write");
458				return(1);
459			}
460#endif
461		} else if (ioctl(f, DIOCWDINFO, lp) < 0) {
462			l_perror("ioctl DIOCWDINFO");
463			return (1);
464		}
465	}
466	return (0);
467}
468
469void
470l_perror(const char *s)
471{
472	switch (errno) {
473
474	case ESRCH:
475		warnx("%s: no disk label on disk;", s);
476		fprintf(stderr, "add \"-r\" to install initial label\n");
477		break;
478
479	case EINVAL:
480		warnx("%s: label magic number or checksum is wrong!", s);
481		fprintf(stderr, "(disklabel or kernel is out of date?)\n");
482		break;
483
484	case EBUSY:
485		warnx("%s: open partition would move or shrink", s);
486		break;
487
488	case EXDEV:
489		warnx("%s: '%c' partition must start at beginning of disk",
490		    s, 'a' + RAW_PART);
491		break;
492
493	default:
494		warn((char *)NULL);
495		break;
496	}
497}
498
499/*
500 * Fetch disklabel for disk.
501 * Use ioctl to get label unless -r flag is given.
502 */
503struct disklabel *
504readlabel(int f)
505{
506	struct disklabel *lp;
507
508	if (rflag) {
509		if (read(f, bootarea, BBSIZE) < BBSIZE)
510			err(4, "%s", specname);
511		for (lp = (struct disklabel *)bootarea;
512		    lp <= (struct disklabel *)(bootarea + BBSIZE - sizeof(*lp));
513		    lp = (struct disklabel *)((char *)lp + 16))
514			if (lp->d_magic == DISKMAGIC &&
515			    lp->d_magic2 == DISKMAGIC)
516				break;
517		if (lp > (struct disklabel *)(bootarea+BBSIZE-sizeof(*lp)) ||
518		    lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC ||
519		    dkcksum(lp) != 0)
520			errx(1,
521	    "bad pack magic number (label is damaged, or pack is unlabeled)");
522	} else {
523		lp = &lab;
524		if (ioctl(f, DIOCGDINFO, lp) < 0)
525			err(4, "ioctl DIOCGDINFO");
526	}
527	return (lp);
528}
529
530/*
531 * Construct a bootarea (d_bbsize bytes) in the specified buffer ``boot''
532 * Returns a pointer to the disklabel portion of the bootarea.
533 */
534struct disklabel *
535makebootarea(char *boot, struct disklabel *dp, int f)
536{
537	struct disklabel *lp;
538	char *p;
539	int b;
540#if NUMBOOT > 0
541	char *dkbasename;
542	struct stat sb;
543#endif
544#ifdef __alpha__
545	u_long *bootinfo;
546	int n;
547#endif
548#ifdef __i386__
549	char *tmpbuf;
550	int i, found;
551#endif
552
553	/* XXX */
554	if (dp->d_secsize == 0) {
555		dp->d_secsize = DEV_BSIZE;
556		dp->d_bbsize = BBSIZE;
557	}
558	lp = (struct disklabel *)
559		(boot + (LABELSECTOR * dp->d_secsize) + LABELOFFSET);
560	bzero((char *)lp, sizeof *lp);
561#if NUMBOOT > 0
562	/*
563	 * If we are not installing a boot program but we are installing a
564	 * label on disk then we must read the current bootarea so we don't
565	 * clobber the existing boot.
566	 */
567	if (!installboot) {
568		if (rflag) {
569			if (read(f, boot, BBSIZE) < BBSIZE)
570				err(4, "%s", specname);
571			bzero((char *)lp, sizeof *lp);
572		}
573		return (lp);
574	}
575	/*
576	 * We are installing a boot program.  Determine the name(s) and
577	 * read them into the appropriate places in the boot area.
578	 */
579	if (!xxboot || !bootxx) {
580		dkbasename = np;
581		if ((p = rindex(dkname, '/')) == NULL)
582			p = dkname;
583		else
584			p++;
585		while (*p && !isdigit(*p))
586			*np++ = *p++;
587		*np++ = '\0';
588
589		if (!xxboot) {
590			(void)sprintf(boot0, "%s/boot1", _PATH_BOOTDIR);
591			xxboot = boot0;
592		}
593#if NUMBOOT > 1
594		if (!bootxx) {
595			(void)sprintf(boot1, "%s/boot2", _PATH_BOOTDIR);
596			bootxx = boot1;
597		}
598#endif
599	}
600
601	/*
602	 * Strange rules:
603	 * 1. One-piece bootstrap (hp300/hp800)
604	 * 1. One-piece bootstrap (alpha/sparc64)
605	 *	up to d_bbsize bytes of ``xxboot'' go in bootarea, the rest
606	 *	is remembered and written later following the bootarea.
607	 * 2. Two-piece bootstraps (i386/ia64)
608	 *	up to d_secsize bytes of ``xxboot'' go in first d_secsize
609	 *	bytes of bootarea, remaining d_bbsize-d_secsize filled
610	 *	from ``bootxx''.
611	 */
612	b = open(xxboot, O_RDONLY);
613	if (b < 0)
614		err(4, "%s", xxboot);
615#if NUMBOOT > 1
616#ifdef __i386__
617	/*
618	 * XXX Botch alert.
619	 * The i386 has the so-called fdisk table embedded into the
620	 * primary bootstrap.  We take care to not clobber it, but
621	 * only if it does already contain some data.  (Otherwise,
622	 * the xxboot provides a template.)
623	 */
624	if ((tmpbuf = (char *)malloc((int)dp->d_secsize)) == 0)
625		err(4, "%s", xxboot);
626	memcpy((void *)tmpbuf, (void *)boot, (int)dp->d_secsize);
627#endif /* __i386__ */
628	if (read(b, boot, (int)dp->d_secsize) < 0)
629		err(4, "%s", xxboot);
630	(void)close(b);
631#ifdef PC98
632	for (i = DOSPARTOFF, found = 0;
633	     !found && i < (int)(DOSPARTOFF + NDOSPART * sizeof(struct pc98_partition));
634	     i++)
635		found = tmpbuf[i] != 0;
636	if (found)
637		memcpy((void *)&boot[DOSPARTOFF],
638		       (void *)&tmpbuf[DOSPARTOFF],
639		       NDOSPART * sizeof(struct pc98_partition));
640	free(tmpbuf);
641#elif defined(__i386__)
642	for (i = DOSPARTOFF, found = 0;
643	     !found && i < (int)(DOSPARTOFF + NDOSPART*sizeof(struct dos_partition));
644	     i++)
645		found = tmpbuf[i] != 0;
646	if (found)
647		memcpy((void *)&boot[DOSPARTOFF],
648		       (void *)&tmpbuf[DOSPARTOFF],
649		       NDOSPART * sizeof(struct dos_partition));
650	free(tmpbuf);
651#endif /* __i386__ */
652	b = open(bootxx, O_RDONLY);
653	if (b < 0)
654		err(4, "%s", bootxx);
655	if (fstat(b, &sb) != 0)
656		err(4, "%s", bootxx);
657	if (dp->d_secsize + sb.st_size > dp->d_bbsize)
658		errx(4, "%s too large", bootxx);
659	if (read(b, &boot[dp->d_secsize],
660		 (int)(dp->d_bbsize-dp->d_secsize)) < 0)
661		err(4, "%s", bootxx);
662#else /* !(NUMBOOT > 1) */
663#ifdef __alpha__
664	/*
665	 * On the alpha, the primary bootstrap starts at the
666	 * second sector of the boot area.  The first sector
667	 * contains the label and must be edited to contain the
668	 * size and location of the primary bootstrap.
669	 */
670	n = read(b, boot + dp->d_secsize, (int)dp->d_bbsize);
671	if (n < 0)
672		err(4, "%s", xxboot);
673	bootinfo = (u_long *)(boot + 480);
674	bootinfo[0] = (n + dp->d_secsize - 1) / dp->d_secsize;
675	bootinfo[1] = 1;	/* start at sector 1 */
676	bootinfo[2] = 0;	/* flags (must be zero) */
677#else /* !__alpha__ */
678	if (read(b, boot, (int)dp->d_bbsize) < 0)
679		err(4, "%s", xxboot);
680#endif /* __alpha__ */
681	if (fstat(b, &sb) != 0)
682		err(4, "%s", xxboot);
683	bootsize = (int)sb.st_size - dp->d_bbsize;
684	if (bootsize > 0) {
685		/* XXX assume d_secsize is a power of two */
686		bootsize = (bootsize + dp->d_secsize-1) & ~(dp->d_secsize-1);
687		bootbuf = (char *)malloc((size_t)bootsize);
688		if (bootbuf == 0)
689			err(4, "%s", xxboot);
690		if (read(b, bootbuf, bootsize) < 0) {
691			free(bootbuf);
692			err(4, "%s", xxboot);
693		}
694	}
695#endif /* NUMBOOT > 1 */
696	(void)close(b);
697#endif /* NUMBOOT > 0 */
698	/*
699	 * Make sure no part of the bootstrap is written in the area
700	 * reserved for the label.
701	 */
702	for (p = (char *)lp; p < (char *)lp + sizeof(struct disklabel); p++)
703		if (*p)
704			errx(2, "bootstrap doesn't leave room for disk label");
705	return (lp);
706}
707
708void
709display(FILE *f, const struct disklabel *lp)
710{
711	int i, j;
712	const struct partition *pp;
713
714	fprintf(f, "# %s:\n", specname);
715	if (lp->d_type < DKMAXTYPES)
716		fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
717	else
718		fprintf(f, "type: %u\n", lp->d_type);
719	fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
720		lp->d_typename);
721	fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
722		lp->d_packname);
723	fprintf(f, "flags:");
724	if (lp->d_flags & D_REMOVABLE)
725		fprintf(f, " removeable");
726	if (lp->d_flags & D_ECC)
727		fprintf(f, " ecc");
728	if (lp->d_flags & D_BADSECT)
729		fprintf(f, " badsect");
730	fprintf(f, "\n");
731	fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
732	fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
733	fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
734	fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
735	fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
736	fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
737	fprintf(f, "rpm: %u\n", lp->d_rpm);
738	fprintf(f, "interleave: %u\n", lp->d_interleave);
739	fprintf(f, "trackskew: %u\n", lp->d_trackskew);
740	fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
741	fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
742	    (u_long)lp->d_headswitch);
743	fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
744	    (u_long)lp->d_trkseek);
745	fprintf(f, "drivedata: ");
746	for (i = NDDATA - 1; i >= 0; i--)
747		if (lp->d_drivedata[i])
748			break;
749	if (i < 0)
750		i = 0;
751	for (j = 0; j <= i; j++)
752		fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
753	fprintf(f, "\n\n%u partitions:\n", lp->d_npartitions);
754	fprintf(f,
755	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
756	pp = lp->d_partitions;
757	for (i = 0; i < lp->d_npartitions; i++, pp++) {
758		if (pp->p_size) {
759			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
760			   (u_long)pp->p_size, (u_long)pp->p_offset);
761			if (pp->p_fstype < FSMAXTYPES)
762				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
763			else
764				fprintf(f, "%8d", pp->p_fstype);
765			switch (pp->p_fstype) {
766
767			case FS_UNUSED:				/* XXX */
768				fprintf(f, "    %5lu %5lu %5.5s ",
769				    (u_long)pp->p_fsize,
770				    (u_long)(pp->p_fsize * pp->p_frag), "");
771				break;
772
773			case FS_BSDFFS:
774				fprintf(f, "    %5lu %5lu %5u ",
775				    (u_long)pp->p_fsize,
776				    (u_long)(pp->p_fsize * pp->p_frag),
777				    pp->p_cpg);
778				break;
779
780			case FS_BSDLFS:
781				fprintf(f, "    %5lu %5lu %5d",
782				    (u_long)pp->p_fsize,
783				    (u_long)(pp->p_fsize * pp->p_frag),
784				    pp->p_cpg);
785				break;
786
787			default:
788				fprintf(f, "%20.20s", "");
789				break;
790			}
791			fprintf(f, "\t# (Cyl. %4lu",
792			    (u_long)(pp->p_offset / lp->d_secpercyl));
793			if (pp->p_offset % lp->d_secpercyl)
794			    putc('*', f);
795			else
796			    putc(' ', f);
797			fprintf(f, "- %lu",
798			    (u_long)((pp->p_offset + pp->p_size +
799			    lp->d_secpercyl - 1) /
800			    lp->d_secpercyl - 1));
801			if (pp->p_size % lp->d_secpercyl)
802			    putc('*', f);
803			fprintf(f, ")\n");
804		}
805	}
806	fflush(f);
807}
808
809int
810edit(struct disklabel *lp, int f)
811{
812	int c, fd;
813	struct disklabel label;
814	FILE *fp;
815
816	if ((fd = mkstemp(tmpfil)) == -1 ||
817	    (fp = fdopen(fd, "w")) == NULL) {
818		warnx("can't create %s", tmpfil);
819		return (1);
820	}
821	display(fp, lp);
822	fclose(fp);
823	for (;;) {
824		if (!editit())
825			break;
826		fp = fopen(tmpfil, "r");
827		if (fp == NULL) {
828			warnx("can't reopen %s for reading", tmpfil);
829			break;
830		}
831		bzero((char *)&label, sizeof(label));
832		if (getasciilabel(fp, &label)) {
833			*lp = label;
834			if (writelabel(f, bootarea, lp) == 0) {
835				fclose(fp);
836				(void) unlink(tmpfil);
837				return (0);
838			}
839		}
840		fclose(fp);
841		printf("re-edit the label? [y]: "); fflush(stdout);
842		c = getchar();
843		if (c != EOF && c != (int)'\n')
844			while (getchar() != (int)'\n')
845				;
846		if  (c == (int)'n')
847			break;
848	}
849	(void) unlink(tmpfil);
850	return (1);
851}
852
853int
854editit(void)
855{
856	int pid, xpid;
857	int locstat, omask;
858	const char *ed;
859
860	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
861	while ((pid = fork()) < 0) {
862		if (errno == EPROCLIM) {
863			warnx("you have too many processes");
864			return(0);
865		}
866		if (errno != EAGAIN) {
867			warn("fork");
868			return(0);
869		}
870		sleep(1);
871	}
872	if (pid == 0) {
873		sigsetmask(omask);
874		setgid(getgid());
875		setuid(getuid());
876		if ((ed = getenv("EDITOR")) == (char *)0)
877			ed = DEFEDITOR;
878		execlp(ed, ed, tmpfil, (char *)0);
879		err(1, "%s", ed);
880	}
881	while ((xpid = wait(&locstat)) >= 0)
882		if (xpid == pid)
883			break;
884	sigsetmask(omask);
885	return(!locstat);
886}
887
888char *
889skip(char *cp)
890{
891
892	while (*cp != '\0' && isspace(*cp))
893		cp++;
894	if (*cp == '\0' || *cp == '#')
895		return (NULL);
896	return (cp);
897}
898
899char *
900word(char *cp)
901{
902	char c;
903
904	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
905		cp++;
906	if ((c = *cp) != '\0') {
907		*cp++ = '\0';
908		if (c != '#')
909			return (skip(cp));
910	}
911	return (NULL);
912}
913
914/*
915 * Read an ascii label in from fd f,
916 * in the same format as that put out by display(),
917 * and fill in lp.
918 */
919int
920getasciilabel(FILE *f, struct disklabel *lp)
921{
922	char *cp;
923	const char **cpp;
924	u_int part;
925	char *tp, line[BUFSIZ];
926	u_long v;
927	int lineno = 0, errors = 0;
928	int i;
929
930	bzero(&part_set, sizeof(part_set));
931	bzero(&part_size_type, sizeof(part_size_type));
932	bzero(&part_offset_type, sizeof(part_offset_type));
933	lp->d_bbsize = BBSIZE;				/* XXX */
934	lp->d_sbsize = 0;				/* XXX */
935	while (fgets(line, sizeof(line) - 1, f)) {
936		lineno++;
937		if ((cp = index(line,'\n')) != 0)
938			*cp = '\0';
939		cp = skip(line);
940		if (cp == NULL)
941			continue;
942		tp = index(cp, ':');
943		if (tp == NULL) {
944			fprintf(stderr, "line %d: syntax error\n", lineno);
945			errors++;
946			continue;
947		}
948		*tp++ = '\0', tp = skip(tp);
949		if (streq(cp, "type")) {
950			if (tp == NULL)
951				tp = unknown;
952			cpp = dktypenames;
953			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
954				if (*cpp && streq(*cpp, tp)) {
955					lp->d_type = cpp - dktypenames;
956					break;
957				}
958			if (cpp < &dktypenames[DKMAXTYPES])
959				continue;
960			v = strtoul(tp, NULL, 10);
961			if (v >= DKMAXTYPES)
962				fprintf(stderr, "line %d:%s %lu\n", lineno,
963				    "Warning, unknown disk type", v);
964			lp->d_type = v;
965			continue;
966		}
967		if (streq(cp, "flags")) {
968			for (v = 0; (cp = tp) && *cp != '\0';) {
969				tp = word(cp);
970				if (streq(cp, "removeable"))
971					v |= D_REMOVABLE;
972				else if (streq(cp, "ecc"))
973					v |= D_ECC;
974				else if (streq(cp, "badsect"))
975					v |= D_BADSECT;
976				else {
977					fprintf(stderr,
978					    "line %d: %s: bad flag\n",
979					    lineno, cp);
980					errors++;
981				}
982			}
983			lp->d_flags = v;
984			continue;
985		}
986		if (streq(cp, "drivedata")) {
987			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
988				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
989				tp = word(cp);
990			}
991			continue;
992		}
993		if (sscanf(cp, "%lu partitions", &v) == 1) {
994			if (v == 0 || v > MAXPARTITIONS) {
995				fprintf(stderr,
996				    "line %d: bad # of partitions\n", lineno);
997				lp->d_npartitions = MAXPARTITIONS;
998				errors++;
999			} else
1000				lp->d_npartitions = v;
1001			continue;
1002		}
1003		if (tp == NULL)
1004			tp = blank;
1005		if (streq(cp, "disk")) {
1006			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
1007			continue;
1008		}
1009		if (streq(cp, "label")) {
1010			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
1011			continue;
1012		}
1013		if (streq(cp, "bytes/sector")) {
1014			v = strtoul(tp, NULL, 10);
1015			if (v == 0 || (v % DEV_BSIZE) != 0) {
1016				fprintf(stderr,
1017				    "line %d: %s: bad sector size\n",
1018				    lineno, tp);
1019				errors++;
1020			} else
1021				lp->d_secsize = v;
1022			continue;
1023		}
1024		if (streq(cp, "sectors/track")) {
1025			v = strtoul(tp, NULL, 10);
1026#if (ULONG_MAX != 0xffffffffUL)
1027			if (v == 0 || v > 0xffffffff) {
1028#else
1029			if (v == 0) {
1030#endif
1031				fprintf(stderr, "line %d: %s: bad %s\n",
1032				    lineno, tp, cp);
1033				errors++;
1034			} else
1035				lp->d_nsectors = v;
1036			continue;
1037		}
1038		if (streq(cp, "sectors/cylinder")) {
1039			v = strtoul(tp, NULL, 10);
1040			if (v == 0) {
1041				fprintf(stderr, "line %d: %s: bad %s\n",
1042				    lineno, tp, cp);
1043				errors++;
1044			} else
1045				lp->d_secpercyl = v;
1046			continue;
1047		}
1048		if (streq(cp, "tracks/cylinder")) {
1049			v = strtoul(tp, NULL, 10);
1050			if (v == 0) {
1051				fprintf(stderr, "line %d: %s: bad %s\n",
1052				    lineno, tp, cp);
1053				errors++;
1054			} else
1055				lp->d_ntracks = v;
1056			continue;
1057		}
1058		if (streq(cp, "cylinders")) {
1059			v = strtoul(tp, NULL, 10);
1060			if (v == 0) {
1061				fprintf(stderr, "line %d: %s: bad %s\n",
1062				    lineno, tp, cp);
1063				errors++;
1064			} else
1065				lp->d_ncylinders = v;
1066			continue;
1067		}
1068		if (streq(cp, "sectors/unit")) {
1069			v = strtoul(tp, NULL, 10);
1070			if (v == 0) {
1071				fprintf(stderr, "line %d: %s: bad %s\n",
1072				    lineno, tp, cp);
1073				errors++;
1074			} else
1075				lp->d_secperunit = v;
1076			continue;
1077		}
1078		if (streq(cp, "rpm")) {
1079			v = strtoul(tp, NULL, 10);
1080			if (v == 0 || v > USHRT_MAX) {
1081				fprintf(stderr, "line %d: %s: bad %s\n",
1082				    lineno, tp, cp);
1083				errors++;
1084			} else
1085				lp->d_rpm = v;
1086			continue;
1087		}
1088		if (streq(cp, "interleave")) {
1089			v = strtoul(tp, NULL, 10);
1090			if (v == 0 || v > USHRT_MAX) {
1091				fprintf(stderr, "line %d: %s: bad %s\n",
1092				    lineno, tp, cp);
1093				errors++;
1094			} else
1095				lp->d_interleave = v;
1096			continue;
1097		}
1098		if (streq(cp, "trackskew")) {
1099			v = strtoul(tp, NULL, 10);
1100			if (v > USHRT_MAX) {
1101				fprintf(stderr, "line %d: %s: bad %s\n",
1102				    lineno, tp, cp);
1103				errors++;
1104			} else
1105				lp->d_trackskew = v;
1106			continue;
1107		}
1108		if (streq(cp, "cylinderskew")) {
1109			v = strtoul(tp, NULL, 10);
1110			if (v > USHRT_MAX) {
1111				fprintf(stderr, "line %d: %s: bad %s\n",
1112				    lineno, tp, cp);
1113				errors++;
1114			} else
1115				lp->d_cylskew = v;
1116			continue;
1117		}
1118		if (streq(cp, "headswitch")) {
1119			v = strtoul(tp, NULL, 10);
1120			lp->d_headswitch = v;
1121			continue;
1122		}
1123		if (streq(cp, "track-to-track seek")) {
1124			v = strtoul(tp, NULL, 10);
1125			lp->d_trkseek = v;
1126			continue;
1127		}
1128		/* the ':' was removed above */
1129		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
1130			fprintf(stderr,
1131			    "line %d: %s: Unknown disklabel field\n", lineno,
1132			    cp);
1133			errors++;
1134			continue;
1135		}
1136
1137		/* Process a partition specification line. */
1138		part = *cp - 'a';
1139		if (part >= lp->d_npartitions) {
1140			fprintf(stderr,
1141			    "line %d: partition name out of range a-%c: %s\n",
1142			    lineno, 'a' + lp->d_npartitions - 1, cp);
1143			errors++;
1144			continue;
1145		}
1146		part_set[part] = 1;
1147
1148		if (getasciipartspec(tp, lp, part, lineno) != 0) {
1149			errors++;
1150			break;
1151		}
1152	}
1153	errors += checklabel(lp);
1154	return (errors == 0);
1155}
1156
1157#define NXTNUM(n) do { \
1158	if (tp == NULL) { \
1159		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1160		return (1); \
1161	} else { \
1162		cp = tp, tp = word(cp); \
1163		(n) = strtoul(cp, NULL, 10); \
1164	} \
1165} while (0)
1166
1167/* retain 1 character following number */
1168#define NXTWORD(w,n) do { \
1169	if (tp == NULL) { \
1170		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1171		return (1); \
1172	} else { \
1173	        char *tmp; \
1174		cp = tp, tp = word(cp); \
1175	        (n) = strtoul(cp, &tmp, 10); \
1176		if (tmp) (w) = *tmp; \
1177	} \
1178} while (0)
1179
1180/*
1181 * Read a partition line into partition `part' in the specified disklabel.
1182 * Return 0 on success, 1 on failure.
1183 */
1184int
1185getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1186{
1187	struct partition *pp;
1188	char *cp;
1189	const char **cpp;
1190	u_long v;
1191
1192	pp = &lp->d_partitions[part];
1193	cp = NULL;
1194
1195	v = 0;
1196	NXTWORD(part_size_type[part],v);
1197	if (v == 0 && part_size_type[part] != '*') {
1198		fprintf(stderr,
1199		    "line %d: %s: bad partition size\n", lineno, cp);
1200		return (1);
1201	}
1202	pp->p_size = v;
1203
1204	v = 0;
1205	NXTWORD(part_offset_type[part],v);
1206	if (v == 0 && part_offset_type[part] != '*' &&
1207	    part_offset_type[part] != '\0') {
1208		fprintf(stderr,
1209		    "line %d: %s: bad partition offset\n", lineno, cp);
1210		return (1);
1211	}
1212	pp->p_offset = v;
1213	cp = tp, tp = word(cp);
1214	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1215		if (*cpp && streq(*cpp, cp))
1216			break;
1217	if (*cpp != NULL) {
1218		pp->p_fstype = cpp - fstypenames;
1219	} else {
1220		if (isdigit(*cp))
1221			v = strtoul(cp, NULL, 10);
1222		else
1223			v = FSMAXTYPES;
1224		if (v >= FSMAXTYPES) {
1225			fprintf(stderr,
1226			    "line %d: Warning, unknown file system type %s\n",
1227			    lineno, cp);
1228			v = FS_UNUSED;
1229		}
1230		pp->p_fstype = v;
1231	}
1232
1233	switch (pp->p_fstype) {
1234	case FS_UNUSED:
1235		/*
1236		 * allow us to accept defaults for
1237		 * fsize/frag/cpg
1238		 */
1239		if (tp) {
1240			NXTNUM(pp->p_fsize);
1241			if (pp->p_fsize == 0)
1242				break;
1243			NXTNUM(v);
1244			pp->p_frag = v / pp->p_fsize;
1245		}
1246		/* else default to 0's */
1247		break;
1248
1249	/* These happen to be the same */
1250	case FS_BSDFFS:
1251	case FS_BSDLFS:
1252		if (tp) {
1253			NXTNUM(pp->p_fsize);
1254			if (pp->p_fsize == 0)
1255				break;
1256			NXTNUM(v);
1257			pp->p_frag = v / pp->p_fsize;
1258			NXTNUM(pp->p_cpg);
1259		} else {
1260			/*
1261			 * FIX! poor attempt at adaptive
1262			 */
1263			/* 1 GB */
1264			if (pp->p_size < 1024*1024*1024 / lp->d_secsize) {
1265				/*
1266				 * FIX! These are too low, but are traditional
1267				 */
1268				pp->p_fsize = DEFAULT_NEWFS_FRAG;
1269				pp->p_frag = DEFAULT_NEWFS_BLOCK /
1270				    DEFAULT_NEWFS_FRAG;
1271				pp->p_cpg = DEFAULT_NEWFS_CPG;
1272			} else {
1273				pp->p_fsize = BIG_NEWFS_FRAG;
1274				pp->p_frag = BIG_NEWFS_BLOCK /
1275				    BIG_NEWFS_FRAG;
1276				pp->p_cpg = BIG_NEWFS_CPG;
1277			}
1278		}
1279	default:
1280		break;
1281	}
1282	return (0);
1283}
1284
1285/*
1286 * Check disklabel for errors and fill in
1287 * derived fields according to supplied values.
1288 */
1289int
1290checklabel(struct disklabel *lp)
1291{
1292	struct partition *pp;
1293	int i, errors = 0;
1294	char part;
1295	u_long total_size, total_percent, current_offset;
1296	int seen_default_offset;
1297	int hog_part;
1298	int j;
1299	struct partition *pp2;
1300
1301	if (lp->d_secsize == 0) {
1302		fprintf(stderr, "sector size 0\n");
1303		return (1);
1304	}
1305	if (lp->d_nsectors == 0) {
1306		fprintf(stderr, "sectors/track 0\n");
1307		return (1);
1308	}
1309	if (lp->d_ntracks == 0) {
1310		fprintf(stderr, "tracks/cylinder 0\n");
1311		return (1);
1312	}
1313	if  (lp->d_ncylinders == 0) {
1314		fprintf(stderr, "cylinders/unit 0\n");
1315		errors++;
1316	}
1317	if (lp->d_rpm == 0)
1318		Warning("revolutions/minute 0");
1319	if (lp->d_secpercyl == 0)
1320		lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1321	if (lp->d_secperunit == 0)
1322		lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1323	if (lp->d_bbsize == 0) {
1324		fprintf(stderr, "boot block size 0\n");
1325		errors++;
1326	} else if (lp->d_bbsize % lp->d_secsize)
1327		Warning("boot block size %% sector-size != 0");
1328	if (lp->d_npartitions > MAXPARTITIONS)
1329		Warning("number of partitions (%lu) > MAXPARTITIONS (%d)",
1330		    (u_long)lp->d_npartitions, MAXPARTITIONS);
1331
1332	/* first allocate space to the partitions, then offsets */
1333	total_size = 0; /* in sectors */
1334	total_percent = 0; /* in percent */
1335	hog_part = -1;
1336	/* find all fixed partitions */
1337	for (i = 0; i < lp->d_npartitions; i++) {
1338		pp = &lp->d_partitions[i];
1339		if (part_set[i]) {
1340			if (part_size_type[i] == '*') {
1341				if (i == RAW_PART) {
1342					pp->p_size = lp->d_secperunit;
1343				} else {
1344					if (hog_part != -1)
1345						Warning("Too many '*' partitions (%c and %c)",
1346						    hog_part + 'a',i + 'a');
1347					else
1348						hog_part = i;
1349				}
1350			} else {
1351				off_t size;
1352
1353				size = pp->p_size;
1354				switch (part_size_type[i]) {
1355				case '%':
1356					total_percent += size;
1357					break;
1358				case 'k':
1359				case 'K':
1360					size *= 1024ULL;
1361					break;
1362				case 'm':
1363				case 'M':
1364					size *= 1024ULL * 1024ULL;
1365					break;
1366				case 'g':
1367				case 'G':
1368					size *= 1024ULL * 1024ULL * 1024ULL;
1369					break;
1370				case '\0':
1371					break;
1372				default:
1373					Warning("unknown size specifier '%c' (K/M/G are valid)",part_size_type[i]);
1374					break;
1375				}
1376				/* don't count %'s yet */
1377				if (part_size_type[i] != '%') {
1378					/*
1379					 * for all not in sectors, convert to
1380					 * sectors
1381					 */
1382					if (part_size_type[i] != '\0') {
1383						if (size % lp->d_secsize != 0)
1384							Warning("partition %c not an integer number of sectors",
1385							    i + 'a');
1386						size /= lp->d_secsize;
1387						pp->p_size = size;
1388					}
1389					/* else already in sectors */
1390					if (i != RAW_PART)
1391						total_size += size;
1392				}
1393			}
1394		}
1395	}
1396	/* handle % partitions - note %'s don't need to add up to 100! */
1397	if (total_percent != 0) {
1398		long free_space = lp->d_secperunit - total_size;
1399		if (total_percent > 100) {
1400			fprintf(stderr,"total percentage %lu is greater than 100\n",
1401			    total_percent);
1402			errors++;
1403		}
1404
1405		if (free_space > 0) {
1406			for (i = 0; i < lp->d_npartitions; i++) {
1407				pp = &lp->d_partitions[i];
1408				if (part_set[i] && part_size_type[i] == '%') {
1409					/* careful of overflows! and integer roundoff */
1410					pp->p_size = ((double)pp->p_size/100) * free_space;
1411					total_size += pp->p_size;
1412
1413					/* FIX we can lose a sector or so due to roundoff per
1414					   partition.  A more complex algorithm could avoid that */
1415				}
1416			}
1417		} else {
1418			fprintf(stderr,
1419			    "%ld sectors available to give to '*' and '%%' partitions\n",
1420			    free_space);
1421			errors++;
1422			/* fix?  set all % partitions to size 0? */
1423		}
1424	}
1425	/* give anything remaining to the hog partition */
1426	if (hog_part != -1) {
1427		lp->d_partitions[hog_part].p_size = lp->d_secperunit - total_size;
1428		total_size = lp->d_secperunit;
1429	}
1430
1431	/* Now set the offsets for each partition */
1432	current_offset = 0; /* in sectors */
1433	seen_default_offset = 0;
1434	for (i = 0; i < lp->d_npartitions; i++) {
1435		part = 'a' + i;
1436		pp = &lp->d_partitions[i];
1437		if (part_set[i]) {
1438			if (part_offset_type[i] == '*') {
1439				if (i == RAW_PART) {
1440					pp->p_offset = 0;
1441				} else {
1442					pp->p_offset = current_offset;
1443					seen_default_offset = 1;
1444				}
1445			} else {
1446				/* allow them to be out of order for old-style tables */
1447				if (pp->p_offset < current_offset &&
1448				    seen_default_offset && i != RAW_PART &&
1449				    pp->p_fstype != FS_VINUM) {
1450					fprintf(stderr,
1451"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1452					    (long)pp->p_offset,i+'a',current_offset);
1453					fprintf(stderr,
1454"Labels with any *'s for offset must be in ascending order by sector\n");
1455					errors++;
1456				} else if (pp->p_offset != current_offset &&
1457				    i != RAW_PART && seen_default_offset) {
1458					/*
1459					 * this may give unneeded warnings if
1460					 * partitions are out-of-order
1461					 */
1462					Warning(
1463"Offset %ld for partition %c doesn't match expected value %ld",
1464					    (long)pp->p_offset, i + 'a', current_offset);
1465				}
1466			}
1467			if (i != RAW_PART)
1468				current_offset = pp->p_offset + pp->p_size;
1469		}
1470	}
1471
1472	for (i = 0; i < lp->d_npartitions; i++) {
1473		part = 'a' + i;
1474		pp = &lp->d_partitions[i];
1475		if (pp->p_size == 0 && pp->p_offset != 0)
1476			Warning("partition %c: size 0, but offset %lu",
1477			    part, (u_long)pp->p_offset);
1478#ifdef __sparc64__
1479		/* See comment in writelabel(). */
1480		if (pp->p_offset % lp->d_secpercyl != 0) {
1481			fprintf(stderr, "partition %c: does not start on a "
1482			    "cylinder boundary!\n", part);
1483			errors++;
1484		}
1485#endif
1486#ifdef notdef
1487		if (pp->p_size % lp->d_secpercyl)
1488			Warning("partition %c: size %% cylinder-size != 0",
1489			    part);
1490		if (pp->p_offset % lp->d_secpercyl)
1491			Warning("partition %c: offset %% cylinder-size != 0",
1492			    part);
1493#endif
1494		if (pp->p_offset > lp->d_secperunit) {
1495			fprintf(stderr,
1496			    "partition %c: offset past end of unit\n", part);
1497			errors++;
1498		}
1499		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1500			fprintf(stderr,
1501			"partition %c: partition extends past end of unit\n",
1502			    part);
1503			errors++;
1504		}
1505		if (i == RAW_PART)
1506		{
1507			if (pp->p_fstype != FS_UNUSED)
1508				Warning("partition %c is not marked as unused!",part);
1509			if (pp->p_offset != 0)
1510				Warning("partition %c doesn't start at 0!",part);
1511			if (pp->p_size != lp->d_secperunit)
1512				Warning("partition %c doesn't cover the whole unit!",part);
1513
1514			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1515			    (pp->p_size != lp->d_secperunit)) {
1516				Warning("An incorrect partition %c may cause problems for "
1517				    "standard system utilities",part);
1518			}
1519		}
1520
1521		/* check for overlaps */
1522		/* this will check for all possible overlaps once and only once */
1523		for (j = 0; j < i; j++) {
1524			pp2 = &lp->d_partitions[j];
1525			if (j != RAW_PART && i != RAW_PART &&
1526			    pp->p_fstype != FS_VINUM &&
1527			    pp2->p_fstype != FS_VINUM &&
1528			    part_set[i] && part_set[j]) {
1529				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1530				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1531					pp2->p_offset >= pp->p_offset)) {
1532					fprintf(stderr,"partitions %c and %c overlap!\n",
1533					    j + 'a', i + 'a');
1534					errors++;
1535				}
1536			}
1537		}
1538	}
1539	for (; i < MAXPARTITIONS; i++) {
1540		part = 'a' + i;
1541		pp = &lp->d_partitions[i];
1542		if (pp->p_size || pp->p_offset)
1543			Warning("unused partition %c: size %d offset %lu",
1544			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1545	}
1546	return (errors);
1547}
1548
1549/*
1550 * When operating on a "virgin" disk, try getting an initial label
1551 * from the associated device driver.  This might work for all device
1552 * drivers that are able to fetch some initial device parameters
1553 * without even having access to a (BSD) disklabel, like SCSI disks,
1554 * most IDE drives, or vn devices.
1555 *
1556 * The device name must be given in its "canonical" form.
1557 */
1558struct disklabel *
1559getvirginlabel(void)
1560{
1561	static struct disklabel loclab;
1562	struct partition *dp;
1563	char lnamebuf[BBSIZE];
1564	int f;
1565	u_int secsize, u;
1566	off_t mediasize;
1567
1568	if (dkname[0] == '/') {
1569		warnx("\"auto\" requires the usage of a canonical disk name");
1570		return (NULL);
1571	}
1572	(void)snprintf(lnamebuf, BBSIZE, "%s%s", _PATH_DEV, dkname);
1573	if ((f = open(lnamebuf, O_RDONLY)) == -1) {
1574		warn("cannot open %s", lnamebuf);
1575		return (NULL);
1576	}
1577
1578	/* New world order */
1579	if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
1580	    (ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
1581		close (f);
1582		return (NULL);
1583	}
1584	memset(&loclab, 0, sizeof loclab);
1585	loclab.d_magic = DISKMAGIC;
1586	loclab.d_magic2 = DISKMAGIC;
1587	loclab.d_secsize = secsize;
1588	loclab.d_secperunit = mediasize / secsize;
1589
1590	/*
1591	 * Nobody in these enligthened days uses the CHS geometry for
1592	 * anything, but nontheless try to get it right.  If we fail
1593	 * to get any good ideas from the device, construct something
1594	 * which is IBM-PC friendly.
1595	 */
1596	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1597		loclab.d_nsectors = u;
1598	else
1599		loclab.d_nsectors = 63;
1600	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1601		loclab.d_ntracks = u;
1602	else if (loclab.d_secperunit <= 63*1*1024)
1603		loclab.d_ntracks = 1;
1604	else if (loclab.d_secperunit <= 63*16*1024)
1605		loclab.d_ntracks = 16;
1606	else
1607		loclab.d_ntracks = 255;
1608	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1609	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1610	loclab.d_npartitions = MAXPARTITIONS;
1611
1612	/* Various (unneeded) compat stuff */
1613	loclab.d_rpm = 3600;
1614	loclab.d_bbsize = BBSIZE;
1615	loclab.d_interleave = 1;;
1616	strncpy(loclab.d_typename, "amnesiac",
1617	    sizeof(loclab.d_typename));
1618
1619	dp = &loclab.d_partitions[RAW_PART];
1620	dp->p_size = loclab.d_secperunit;
1621	loclab.d_checksum = dkcksum(&loclab);
1622	close (f);
1623	return (&loclab);
1624}
1625
1626/*
1627 * If we are installing a boot program that doesn't fit in d_bbsize
1628 * we need to mark those partitions that the boot overflows into.
1629 * This allows newfs to prevent creation of a file system where it might
1630 * clobber bootstrap code.
1631 */
1632void
1633setbootflag(struct disklabel *lp)
1634{
1635	struct partition *pp;
1636	int i, errors = 0;
1637	char part;
1638	u_long boffset;
1639
1640	if (bootbuf == 0)
1641		return;
1642	boffset = bootsize / lp->d_secsize;
1643	for (i = 0; i < lp->d_npartitions; i++) {
1644		part = 'a' + i;
1645		pp = &lp->d_partitions[i];
1646		if (pp->p_size == 0)
1647			continue;
1648		if (boffset <= pp->p_offset) {
1649			if (pp->p_fstype == FS_BOOT)
1650				pp->p_fstype = FS_UNUSED;
1651		} else if (pp->p_fstype != FS_BOOT) {
1652			if (pp->p_fstype != FS_UNUSED) {
1653				fprintf(stderr,
1654					"boot overlaps used partition %c\n",
1655					part);
1656				errors++;
1657			} else {
1658				pp->p_fstype = FS_BOOT;
1659				Warning("boot overlaps partition %c, %s",
1660					part, "marked as FS_BOOT");
1661			}
1662		}
1663	}
1664	if (errors)
1665		errx(4, "cannot install boot program");
1666}
1667
1668/*VARARGS1*/
1669void
1670Warning(const char *fmt, ...)
1671{
1672	va_list ap;
1673
1674	fprintf(stderr, "Warning, ");
1675	va_start(ap, fmt);
1676	vfprintf(stderr, fmt, ap);
1677	fprintf(stderr, "\n");
1678	va_end(ap);
1679}
1680
1681void
1682usage(void)
1683{
1684#if NUMBOOT > 0
1685	fprintf(stderr, "%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%s\n%s\n",
1686		"usage: disklabel [-r] disk",
1687		"\t\t(to read label)",
1688		"       disklabel -w [-r] [-n] disk type [ packid ]",
1689		"\t\t(to write label with existing boot program)",
1690		"       disklabel -e [-r] [-n] disk",
1691		"\t\t(to edit label)",
1692		"       disklabel -R [-r] [-n] disk protofile",
1693		"\t\t(to restore label with existing boot program)",
1694#if NUMBOOT > 1
1695		"       disklabel -B [-n] [ -b boot1 [ -s boot2 ] ] disk [ type ]",
1696		"\t\t(to install boot program with existing label)",
1697		"       disklabel -w -B [-n] [ -b boot1 [ -s boot2 ] ] disk type [ packid ]",
1698		"\t\t(to write label and boot program)",
1699		"       disklabel -R -B [-n] [ -b boot1 [ -s boot2 ] ] disk protofile [ type ]",
1700		"\t\t(to restore label and boot program)",
1701#else
1702		"       disklabel -B [-n] [ -b bootprog ] disk [ type ]",
1703		"\t\t(to install boot program with existing on-disk label)",
1704		"       disklabel -w -B [-n] [ -b bootprog ] disk type [ packid ]",
1705		"\t\t(to write label and install boot program)",
1706		"       disklabel -R -B [-n] [ -b bootprog ] disk protofile [ type ]",
1707		"\t\t(to restore label and install boot program)",
1708#endif
1709#else
1710	fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1711		"usage: disklabel [-r] disk", "(to read label)",
1712		"       disklabel -w [-r] [-n] disk type [ packid ]",
1713		"\t\t(to write label)",
1714		"       disklabel -e [-r] [-n] disk",
1715		"\t\t(to edit label)",
1716		"       disklabel -R [-r] [-n] disk protofile",
1717		"\t\t(to restore label)",
1718		"       disklabel [-NW] disk",
1719		"\t\t(to write disable/enable label)");
1720#endif
1721	exit(1);
1722}
1723