bsdlabel.c revision 3111 
1/*
2 * Copyright (c) 1987, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Symmetric Computer Systems.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1987, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 1/7/94";
45/* from static char sccsid[] = "@(#)disklabel.c	1.2 (Symmetric) 11/28/85"; */
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/signal.h>
50#include <sys/errno.h>
51#include <sys/file.h>
52#include <sys/ioctl.h>
53#include <sys/stat.h>
54#define DKTYPENAMES
55#include <sys/disklabel.h>
56#include <ufs/ffs/fs.h>
57#include <unistd.h>
58#include <string.h>
59#include <stdio.h>
60#include <ctype.h>
61#include "pathnames.h"
62
63/*
64 * Disklabel: read and write disklabels.
65 * The label is usually placed on one of the first sectors of the disk.
66 * Many machines also place a bootstrap in the same area,
67 * in which case the label is embedded in the bootstrap.
68 * The bootstrap source must leave space at the proper offset
69 * for the label on such machines.
70 */
71
72#ifdef tahoe
73#define RAWPARTITION	'a'
74#else
75#define RAWPARTITION	'c'
76#endif
77
78#ifndef BBSIZE
79#define	BBSIZE	8192			/* size of boot area, with label */
80#endif
81
82#ifdef tahoe
83#define	NUMBOOT	0
84#else
85#if defined(hp300) || defined(hp800)
86#define	NUMBOOT	1
87#else
88#define	NUMBOOT	2
89#endif
90#endif
91
92#define	DEFEDITOR	_PATH_VI
93#define	streq(a,b)	(strcmp(a,b) == 0)
94
95char	*dkname;
96char	*specname;
97char	tmpfil[] = _PATH_TMP;
98
99extern	int errno;
100char	namebuf[BBSIZE], *np = namebuf;
101struct	disklabel lab;
102struct	disklabel *readlabel(), *makebootarea();
103char	bootarea[BBSIZE];
104
105#if NUMBOOT > 0
106int	installboot;	/* non-zero if we should install a boot program */
107char	*bootbuf;	/* pointer to buffer with remainder of boot prog */
108int	bootsize;	/* size of remaining boot program */
109char	*xxboot;	/* primary boot */
110char	*bootxx;	/* secondary boot */
111char	boot0[MAXPATHLEN];
112char	boot1[MAXPATHLEN];
113#endif
114
115enum	{
116	UNSPEC, EDIT, NOWRITE, READ, RESTORE, WRITE, WRITEABLE, WRITEBOOT
117} op = UNSPEC;
118
119int	rflag;
120
121#ifdef DEBUG
122int	debug;
123#define OPTIONS	"BNRWb:ders:w"
124#else
125#define OPTIONS	"BNRWb:ers:w"
126#endif
127
128
129main(argc, argv)
130	int argc;
131	char *argv[];
132{
133	extern char *optarg;
134	extern int optind;
135	register struct disklabel *lp;
136	FILE *t;
137	int ch, f, flag, error = 0;
138	char *name = 0;
139
140	while ((ch = getopt(argc, argv, OPTIONS)) != EOF)
141		switch (ch) {
142#if NUMBOOT > 0
143			case 'B':
144				++installboot;
145				break;
146			case 'b':
147				xxboot = optarg;
148				break;
149#if NUMBOOT > 1
150			case 's':
151				bootxx = optarg;
152				break;
153#endif
154#endif
155			case 'N':
156				if (op != UNSPEC)
157					usage();
158				op = NOWRITE;
159				break;
160			case 'R':
161				if (op != UNSPEC)
162					usage();
163				op = RESTORE;
164				break;
165			case 'W':
166				if (op != UNSPEC)
167					usage();
168				op = WRITEABLE;
169				break;
170			case 'e':
171				if (op != UNSPEC)
172					usage();
173				op = EDIT;
174				break;
175			case 'r':
176				++rflag;
177				break;
178			case 'w':
179				if (op != UNSPEC)
180					usage();
181				op = WRITE;
182				break;
183#ifdef DEBUG
184			case 'd':
185				debug++;
186				break;
187#endif
188			case '?':
189			default:
190				usage();
191		}
192	argc -= optind;
193	argv += optind;
194#if NUMBOOT > 0
195	if (installboot) {
196		rflag++;
197		if (op == UNSPEC)
198			op = WRITEBOOT;
199	} else {
200		if (op == UNSPEC)
201			op = READ;
202		xxboot = bootxx = 0;
203	}
204#else
205	if (op == UNSPEC)
206		op = READ;
207#endif
208	if (argc < 1)
209		usage();
210
211	dkname = argv[0];
212	if (dkname[0] != '/') {
213		(void)sprintf(np, "%sr%s%c", _PATH_DEV, dkname, RAWPARTITION);
214		specname = np;
215		np += strlen(specname) + 1;
216	} else
217		specname = dkname;
218	f = open(specname, op == READ ? O_RDONLY : O_RDWR);
219	if (f < 0 && errno == ENOENT && dkname[0] != '/') {
220		(void)sprintf(specname, "%sr%s", _PATH_DEV, dkname);
221		np = namebuf + strlen(specname) + 1;
222		f = open(specname, op == READ ? O_RDONLY : O_RDWR);
223	}
224	if (f < 0)
225		Perror(specname);
226
227	switch(op) {
228
229	case EDIT:
230		if (argc != 1)
231			usage();
232		lp = readlabel(f);
233		error = edit(lp, f);
234		break;
235
236	case NOWRITE:
237		flag = 0;
238		if (ioctl(f, DIOCWLABEL, (char *)&flag) < 0)
239			Perror("ioctl DIOCWLABEL");
240		break;
241
242	case READ:
243		if (argc != 1)
244			usage();
245		lp = readlabel(f);
246		display(stdout, lp);
247		error = checklabel(lp);
248		break;
249
250	case RESTORE:
251#if NUMBOOT > 0
252		if (installboot && argc == 3) {
253			makelabel(argv[2], 0, &lab);
254			argc--;
255		}
256#endif
257		if (argc != 2)
258			usage();
259		lp = makebootarea(bootarea, &lab, f);
260		if (!(t = fopen(argv[1], "r")))
261			Perror(argv[1]);
262		if (getasciilabel(t, lp))
263			error = writelabel(f, bootarea, lp);
264		break;
265
266	case WRITE:
267		if (argc == 3) {
268			name = argv[2];
269			argc--;
270		}
271		if (argc != 2)
272			usage();
273		makelabel(argv[1], name, &lab);
274		lp = makebootarea(bootarea, &lab, f);
275		*lp = lab;
276		if (checklabel(lp) == 0)
277			error = writelabel(f, bootarea, lp);
278		break;
279
280	case WRITEABLE:
281		flag = 1;
282		if (ioctl(f, DIOCWLABEL, (char *)&flag) < 0)
283			Perror("ioctl DIOCWLABEL");
284		break;
285
286#if NUMBOOT > 0
287	case WRITEBOOT:
288	{
289		struct disklabel tlab;
290
291		lp = readlabel(f);
292		tlab = *lp;
293		if (argc == 2)
294			makelabel(argv[1], 0, &lab);
295		lp = makebootarea(bootarea, &lab, f);
296		*lp = tlab;
297		if (checklabel(lp) == 0)
298			error = writelabel(f, bootarea, lp);
299		break;
300	}
301#endif
302	}
303	exit(error);
304}
305
306/*
307 * Construct a prototype disklabel from /etc/disktab.  As a side
308 * effect, set the names of the primary and secondary boot files
309 * if specified.
310 */
311makelabel(type, name, lp)
312	char *type, *name;
313	register struct disklabel *lp;
314{
315	register struct disklabel *dp;
316	char *strcpy();
317
318	dp = getdiskbyname(type);
319	if (dp == NULL) {
320		fprintf(stderr, "%s: unknown disk type\n", type);
321		exit(1);
322	}
323	*lp = *dp;
324#if NUMBOOT > 0
325	/*
326	 * Set bootstrap name(s).
327	 * 1. If set from command line, use those,
328	 * 2. otherwise, check if disktab specifies them (b0 or b1),
329	 * 3. otherwise, makebootarea() will choose ones based on the name
330	 *    of the disk special file. E.g. /dev/ra0 -> raboot, bootra
331	 */
332	if (!xxboot && lp->d_boot0) {
333		if (*lp->d_boot0 != '/')
334			(void)sprintf(boot0, "%s/%s",
335				      _PATH_BOOTDIR, lp->d_boot0);
336		else
337			(void)strcpy(boot0, lp->d_boot0);
338		xxboot = boot0;
339	}
340#if NUMBOOT > 1
341	if (!bootxx && lp->d_boot1) {
342		if (*lp->d_boot1 != '/')
343			(void)sprintf(boot1, "%s/%s",
344				      _PATH_BOOTDIR, lp->d_boot1);
345		else
346			(void)strcpy(boot1, lp->d_boot1);
347		bootxx = boot1;
348	}
349#endif
350#endif
351	/* d_packname is union d_boot[01], so zero */
352	bzero(lp->d_packname, sizeof(lp->d_packname));
353	if (name)
354		(void)strncpy(lp->d_packname, name, sizeof(lp->d_packname));
355}
356
357writelabel(f, boot, lp)
358	int f;
359	char *boot;
360	register struct disklabel *lp;
361{
362	register int i;
363	int flag;
364
365	setbootflag(lp);
366	lp->d_magic = DISKMAGIC;
367	lp->d_magic2 = DISKMAGIC;
368	lp->d_checksum = 0;
369	lp->d_checksum = dkcksum(lp);
370	if (rflag) {
371		/*
372		 * First set the kernel disk label,
373		 * then write a label to the raw disk.
374		 * If the SDINFO ioctl fails because it is unimplemented,
375		 * keep going; otherwise, the kernel consistency checks
376		 * may prevent us from changing the current (in-core)
377		 * label.
378		 */
379		if (ioctl(f, DIOCSDINFO, lp) < 0 &&
380		    errno != ENODEV && errno != ENOTTY) {
381			l_perror("ioctl DIOCSDINFO");
382			return (1);
383		}
384		(void)lseek(f, (off_t)0, SEEK_SET);
385		/*
386		 * write enable label sector before write (if necessary),
387		 * disable after writing.
388		 */
389		flag = 1;
390		if (ioctl(f, DIOCWLABEL, &flag) < 0)
391			perror("ioctl DIOCWLABEL");
392		if (write(f, boot, lp->d_bbsize) != lp->d_bbsize) {
393			perror("write");
394			return (1);
395		}
396#if NUMBOOT > 0
397		/*
398		 * Output the remainder of the disklabel
399		 */
400		if (bootbuf && write(f, bootbuf, bootsize) != bootsize) {
401			perror("write");
402			return(1);
403		}
404#endif
405		flag = 0;
406		(void) ioctl(f, DIOCWLABEL, &flag);
407	} else if (ioctl(f, DIOCWDINFO, lp) < 0) {
408		l_perror("ioctl DIOCWDINFO");
409		return (1);
410	}
411#ifdef vax
412	if (lp->d_type == DTYPE_SMD && lp->d_flags & D_BADSECT) {
413		daddr_t alt;
414
415		alt = lp->d_ncylinders * lp->d_secpercyl - lp->d_nsectors;
416		for (i = 1; i < 11 && i < lp->d_nsectors; i += 2) {
417			(void)lseek(f, (off_t)((alt + i) * lp->d_secsize),
418			    SEEK_SET);
419			if (write(f, boot, lp->d_secsize) < lp->d_secsize) {
420				int oerrno = errno;
421				fprintf(stderr, "alternate label %d ", i/2);
422				errno = oerrno;
423				perror("write");
424			}
425		}
426	}
427#endif
428	return (0);
429}
430
431l_perror(s)
432	char *s;
433{
434	int saverrno = errno;
435
436	fprintf(stderr, "disklabel: %s: ", s);
437
438	switch (saverrno) {
439
440	case ESRCH:
441		fprintf(stderr, "No disk label on disk;\n");
442		fprintf(stderr,
443		    "use \"disklabel -r\" to install initial label\n");
444		break;
445
446	case EINVAL:
447		fprintf(stderr, "Label magic number or checksum is wrong!\n");
448		fprintf(stderr, "(disklabel or kernel is out of date?)\n");
449		break;
450
451	case EBUSY:
452		fprintf(stderr, "Open partition would move or shrink\n");
453		break;
454
455	case EXDEV:
456		fprintf(stderr,
457	"Labeled partition or 'a' partition must start at beginning of disk\n");
458		break;
459
460	default:
461		errno = saverrno;
462		perror((char *)NULL);
463		break;
464	}
465}
466
467/*
468 * Fetch disklabel for disk.
469 * Use ioctl to get label unless -r flag is given.
470 */
471struct disklabel *
472readlabel(f)
473	int f;
474{
475	register struct disklabel *lp;
476
477	if (rflag) {
478		if (read(f, bootarea, BBSIZE) < BBSIZE)
479			Perror(specname);
480		for (lp = (struct disklabel *)bootarea;
481		    lp <= (struct disklabel *)(bootarea + BBSIZE - sizeof(*lp));
482		    lp = (struct disklabel *)((char *)lp + 16))
483			if (lp->d_magic == DISKMAGIC &&
484			    lp->d_magic2 == DISKMAGIC)
485				break;
486		if (lp > (struct disklabel *)(bootarea+BBSIZE-sizeof(*lp)) ||
487		    lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC ||
488		    dkcksum(lp) != 0) {
489			fprintf(stderr,
490	"Bad pack magic number (label is damaged, or pack is unlabeled)\n");
491			/* lp = (struct disklabel *)(bootarea + LABELOFFSET); */
492			exit (1);
493		}
494	} else {
495		lp = &lab;
496		if (ioctl(f, DIOCGDINFO, lp) < 0)
497			Perror("ioctl DIOCGDINFO");
498	}
499	return (lp);
500}
501
502/*
503 * Construct a bootarea (d_bbsize bytes) in the specified buffer ``boot''
504 * Returns a pointer to the disklabel portion of the bootarea.
505 */
506struct disklabel *
507makebootarea(boot, dp, f)
508	char *boot;
509	register struct disklabel *dp;
510	int f;
511{
512	struct disklabel *lp;
513	register char *p;
514	int b;
515#if NUMBOOT > 0
516	char *dkbasename;
517	struct stat sb;
518#endif
519
520	/* XXX */
521	if (dp->d_secsize == 0) {
522		dp->d_secsize = DEV_BSIZE;
523		dp->d_bbsize = BBSIZE;
524	}
525	lp = (struct disklabel *)
526		(boot + (LABELSECTOR * dp->d_secsize) + LABELOFFSET);
527	bzero((char *)lp, sizeof *lp);
528#if NUMBOOT > 0
529	/*
530	 * If we are not installing a boot program but we are installing a
531	 * label on disk then we must read the current bootarea so we don't
532	 * clobber the existing boot.
533	 */
534	if (!installboot) {
535		if (rflag) {
536			if (read(f, boot, BBSIZE) < BBSIZE)
537				Perror(specname);
538			bzero((char *)lp, sizeof *lp);
539		}
540		return (lp);
541	}
542	/*
543	 * We are installing a boot program.  Determine the name(s) and
544	 * read them into the appropriate places in the boot area.
545	 */
546	if (!xxboot || !bootxx) {
547		dkbasename = np;
548		if ((p = rindex(dkname, '/')) == NULL)
549			p = dkname;
550		else
551			p++;
552		while (*p && !isdigit(*p))
553			*np++ = *p++;
554		*np++ = '\0';
555
556		if (!xxboot) {
557			(void)sprintf(np, "%s/%sboot",
558				      _PATH_BOOTDIR, dkbasename);
559			if (access(np, F_OK) < 0 && dkbasename[0] == 'r')
560				dkbasename++;
561			xxboot = np;
562			(void)sprintf(xxboot, "%s/%sboot",
563				      _PATH_BOOTDIR, dkbasename);
564			np += strlen(xxboot) + 1;
565		}
566#if NUMBOOT > 1
567		if (!bootxx) {
568			(void)sprintf(np, "%s/boot%s",
569				      _PATH_BOOTDIR, dkbasename);
570			if (access(np, F_OK) < 0 && dkbasename[0] == 'r')
571				dkbasename++;
572			bootxx = np;
573			(void)sprintf(bootxx, "%s/boot%s",
574				      _PATH_BOOTDIR, dkbasename);
575			np += strlen(bootxx) + 1;
576		}
577#endif
578	}
579#ifdef DEBUG
580	if (debug)
581		fprintf(stderr, "bootstraps: xxboot = %s, bootxx = %s\n",
582			xxboot, bootxx ? bootxx : "NONE");
583#endif
584
585	/*
586	 * Strange rules:
587	 * 1. One-piece bootstrap (hp300/hp800)
588	 *	up to d_bbsize bytes of ``xxboot'' go in bootarea, the rest
589	 *	is remembered and written later following the bootarea.
590	 * 2. Two-piece bootstraps (vax/i386?/mips?)
591	 *	up to d_secsize bytes of ``xxboot'' go in first d_secsize
592	 *	bytes of bootarea, remaining d_bbsize-d_secsize filled
593	 *	from ``bootxx''.
594	 */
595	b = open(xxboot, O_RDONLY);
596	if (b < 0)
597		Perror(xxboot);
598#if NUMBOOT > 1
599	if (read(b, boot, (int)dp->d_secsize) < 0)
600		Perror(xxboot);
601	(void)close(b);
602	b = open(bootxx, O_RDONLY);
603	if (b < 0)
604		Perror(bootxx);
605	if (read(b, &boot[dp->d_secsize], (int)(dp->d_bbsize-dp->d_secsize)) < 0)
606		Perror(bootxx);
607#else
608	if (read(b, boot, (int)dp->d_bbsize) < 0)
609		Perror(xxboot);
610	(void)fstat(b, &sb);
611	bootsize = (int)sb.st_size - dp->d_bbsize;
612	if (bootsize > 0) {
613		/* XXX assume d_secsize is a power of two */
614		bootsize = (bootsize + dp->d_secsize-1) & ~(dp->d_secsize-1);
615		bootbuf = (char *)malloc((size_t)bootsize);
616		if (bootbuf == 0)
617			Perror(xxboot);
618		if (read(b, bootbuf, bootsize) < 0) {
619			free(bootbuf);
620			Perror(xxboot);
621		}
622	}
623#endif
624	(void)close(b);
625#endif
626	/*
627	 * Make sure no part of the bootstrap is written in the area
628	 * reserved for the label.
629	 */
630	for (p = (char *)lp; p < (char *)lp + sizeof(struct disklabel); p++)
631		if (*p) {
632			fprintf(stderr,
633			    "Bootstrap doesn't leave room for disk label\n");
634			exit(2);
635		}
636	return (lp);
637}
638
639display(f, lp)
640	FILE *f;
641	register struct disklabel *lp;
642{
643	register int i, j;
644	register struct partition *pp;
645
646	fprintf(f, "# %s:\n", specname);
647	if ((unsigned) lp->d_type < DKMAXTYPES)
648		fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
649	else
650		fprintf(f, "type: %d\n", lp->d_type);
651	fprintf(f, "disk: %.*s\n", sizeof(lp->d_typename), lp->d_typename);
652	fprintf(f, "label: %.*s\n", sizeof(lp->d_packname), lp->d_packname);
653	fprintf(f, "flags:");
654	if (lp->d_flags & D_REMOVABLE)
655		fprintf(f, " removeable");
656	if (lp->d_flags & D_ECC)
657		fprintf(f, " ecc");
658	if (lp->d_flags & D_BADSECT)
659		fprintf(f, " badsect");
660	fprintf(f, "\n");
661	fprintf(f, "bytes/sector: %d\n", lp->d_secsize);
662	fprintf(f, "sectors/track: %d\n", lp->d_nsectors);
663	fprintf(f, "tracks/cylinder: %d\n", lp->d_ntracks);
664	fprintf(f, "sectors/cylinder: %d\n", lp->d_secpercyl);
665	fprintf(f, "cylinders: %d\n", lp->d_ncylinders);
666	fprintf(f, "rpm: %d\n", lp->d_rpm);
667	fprintf(f, "interleave: %d\n", lp->d_interleave);
668	fprintf(f, "trackskew: %d\n", lp->d_trackskew);
669	fprintf(f, "cylinderskew: %d\n", lp->d_cylskew);
670	fprintf(f, "headswitch: %d\t\t# milliseconds\n", lp->d_headswitch);
671	fprintf(f, "track-to-track seek: %d\t# milliseconds\n", lp->d_trkseek);
672	fprintf(f, "drivedata: ");
673	for (i = NDDATA - 1; i >= 0; i--)
674		if (lp->d_drivedata[i])
675			break;
676	if (i < 0)
677		i = 0;
678	for (j = 0; j <= i; j++)
679		fprintf(f, "%d ", lp->d_drivedata[j]);
680	fprintf(f, "\n\n%d partitions:\n", lp->d_npartitions);
681	fprintf(f,
682	    "#        size   offset    fstype   [fsize bsize   cpg]\n");
683	pp = lp->d_partitions;
684	for (i = 0; i < lp->d_npartitions; i++, pp++) {
685		if (pp->p_size) {
686			fprintf(f, "  %c: %8d %8d  ", 'a' + i,
687			   pp->p_size, pp->p_offset);
688			if ((unsigned) pp->p_fstype < FSMAXTYPES)
689				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
690			else
691				fprintf(f, "%8d", pp->p_fstype);
692			switch (pp->p_fstype) {
693
694			case FS_UNUSED:				/* XXX */
695				fprintf(f, "    %5d %5d %5.5s ",
696				    pp->p_fsize, pp->p_fsize * pp->p_frag, "");
697				break;
698
699			case FS_BSDFFS:
700				fprintf(f, "    %5d %5d %5d ",
701				    pp->p_fsize, pp->p_fsize * pp->p_frag,
702				    pp->p_cpg);
703				break;
704
705			default:
706				fprintf(f, "%20.20s", "");
707				break;
708			}
709			fprintf(f, "\t# (Cyl. %4d",
710			    pp->p_offset / lp->d_secpercyl);
711			if (pp->p_offset % lp->d_secpercyl)
712			    putc('*', f);
713			else
714			    putc(' ', f);
715			fprintf(f, "- %d",
716			    (pp->p_offset +
717			    pp->p_size + lp->d_secpercyl - 1) /
718			    lp->d_secpercyl - 1);
719			if (pp->p_size % lp->d_secpercyl)
720			    putc('*', f);
721			fprintf(f, ")\n");
722		}
723	}
724	fflush(f);
725}
726
727edit(lp, f)
728	struct disklabel *lp;
729	int f;
730{
731	register int c;
732	struct disklabel label;
733	FILE *fd;
734	char *mktemp();
735
736	(void) mktemp(tmpfil);
737	fd = fopen(tmpfil, "w");
738	if (fd == NULL) {
739		fprintf(stderr, "%s: Can't create\n", tmpfil);
740		return (1);
741	}
742	(void)fchmod(fileno(fd), 0600);
743	display(fd, lp);
744	fclose(fd);
745	for (;;) {
746		if (!editit())
747			break;
748		fd = fopen(tmpfil, "r");
749		if (fd == NULL) {
750			fprintf(stderr, "%s: Can't reopen for reading\n",
751				tmpfil);
752			break;
753		}
754		bzero((char *)&label, sizeof(label));
755		if (getasciilabel(fd, &label)) {
756			*lp = label;
757			if (writelabel(f, bootarea, lp) == 0) {
758				(void) unlink(tmpfil);
759				return (0);
760			}
761		}
762		printf("re-edit the label? [y]: "); fflush(stdout);
763		c = getchar();
764		if (c != EOF && c != (int)'\n')
765			while (getchar() != (int)'\n')
766				;
767		if  (c == (int)'n')
768			break;
769	}
770	(void) unlink(tmpfil);
771	return (1);
772}
773
774editit()
775{
776	register int pid, xpid;
777	int stat, omask;
778	extern char *getenv();
779
780	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
781	while ((pid = fork()) < 0) {
782		extern int errno;
783
784		if (errno == EPROCLIM) {
785			fprintf(stderr, "You have too many processes\n");
786			return(0);
787		}
788		if (errno != EAGAIN) {
789			perror("fork");
790			return(0);
791		}
792		sleep(1);
793	}
794	if (pid == 0) {
795		register char *ed;
796
797		sigsetmask(omask);
798		setgid(getgid());
799		setuid(getuid());
800		if ((ed = getenv("EDITOR")) == (char *)0)
801			ed = DEFEDITOR;
802		execlp(ed, ed, tmpfil, 0);
803		perror(ed);
804		exit(1);
805	}
806	while ((xpid = wait(&stat)) >= 0)
807		if (xpid == pid)
808			break;
809	sigsetmask(omask);
810	return(!stat);
811}
812
813char *
814skip(cp)
815	register char *cp;
816{
817
818	while (*cp != '\0' && isspace(*cp))
819		cp++;
820	if (*cp == '\0' || *cp == '#')
821		return ((char *)NULL);
822	return (cp);
823}
824
825char *
826word(cp)
827	register char *cp;
828{
829	register char c;
830
831	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
832		cp++;
833	if ((c = *cp) != '\0') {
834		*cp++ = '\0';
835		if (c != '#')
836			return (skip(cp));
837	}
838	return ((char *)NULL);
839}
840
841/*
842 * Read an ascii label in from fd f,
843 * in the same format as that put out by display(),
844 * and fill in lp.
845 */
846getasciilabel(f, lp)
847	FILE	*f;
848	register struct disklabel *lp;
849{
850	register char **cpp, *cp;
851	register struct partition *pp;
852	char *tp, *s, line[BUFSIZ];
853	int v, lineno = 0, errors = 0;
854
855	lp->d_bbsize = BBSIZE;				/* XXX */
856	lp->d_sbsize = SBSIZE;				/* XXX */
857	while (fgets(line, sizeof(line) - 1, f)) {
858		lineno++;
859		if (cp = index(line,'\n'))
860			*cp = '\0';
861		cp = skip(line);
862		if (cp == NULL)
863			continue;
864		tp = index(cp, ':');
865		if (tp == NULL) {
866			fprintf(stderr, "line %d: syntax error\n", lineno);
867			errors++;
868			continue;
869		}
870		*tp++ = '\0', tp = skip(tp);
871		if (streq(cp, "type")) {
872			if (tp == NULL)
873				tp = "unknown";
874			cpp = dktypenames;
875			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
876				if ((s = *cpp) && streq(s, tp)) {
877					lp->d_type = cpp - dktypenames;
878					goto next;
879				}
880			v = atoi(tp);
881			if ((unsigned)v >= DKMAXTYPES)
882				fprintf(stderr, "line %d:%s %d\n", lineno,
883				    "Warning, unknown disk type", v);
884			lp->d_type = v;
885			continue;
886		}
887		if (streq(cp, "flags")) {
888			for (v = 0; (cp = tp) && *cp != '\0';) {
889				tp = word(cp);
890				if (streq(cp, "removeable"))
891					v |= D_REMOVABLE;
892				else if (streq(cp, "ecc"))
893					v |= D_ECC;
894				else if (streq(cp, "badsect"))
895					v |= D_BADSECT;
896				else {
897					fprintf(stderr,
898					    "line %d: %s: bad flag\n",
899					    lineno, cp);
900					errors++;
901				}
902			}
903			lp->d_flags = v;
904			continue;
905		}
906		if (streq(cp, "drivedata")) {
907			register int i;
908
909			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
910				lp->d_drivedata[i++] = atoi(cp);
911				tp = word(cp);
912			}
913			continue;
914		}
915		if (sscanf(cp, "%d partitions", &v) == 1) {
916			if (v == 0 || (unsigned)v > MAXPARTITIONS) {
917				fprintf(stderr,
918				    "line %d: bad # of partitions\n", lineno);
919				lp->d_npartitions = MAXPARTITIONS;
920				errors++;
921			} else
922				lp->d_npartitions = v;
923			continue;
924		}
925		if (tp == NULL)
926			tp = "";
927		if (streq(cp, "disk")) {
928			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
929			continue;
930		}
931		if (streq(cp, "label")) {
932			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
933			continue;
934		}
935		if (streq(cp, "bytes/sector")) {
936			v = atoi(tp);
937			if (v <= 0 || (v % 512) != 0) {
938				fprintf(stderr,
939				    "line %d: %s: bad sector size\n",
940				    lineno, tp);
941				errors++;
942			} else
943				lp->d_secsize = v;
944			continue;
945		}
946		if (streq(cp, "sectors/track")) {
947			v = atoi(tp);
948			if (v <= 0) {
949				fprintf(stderr, "line %d: %s: bad %s\n",
950				    lineno, tp, cp);
951				errors++;
952			} else
953				lp->d_nsectors = v;
954			continue;
955		}
956		if (streq(cp, "sectors/cylinder")) {
957			v = atoi(tp);
958			if (v <= 0) {
959				fprintf(stderr, "line %d: %s: bad %s\n",
960				    lineno, tp, cp);
961				errors++;
962			} else
963				lp->d_secpercyl = v;
964			continue;
965		}
966		if (streq(cp, "tracks/cylinder")) {
967			v = atoi(tp);
968			if (v <= 0) {
969				fprintf(stderr, "line %d: %s: bad %s\n",
970				    lineno, tp, cp);
971				errors++;
972			} else
973				lp->d_ntracks = v;
974			continue;
975		}
976		if (streq(cp, "cylinders")) {
977			v = atoi(tp);
978			if (v <= 0) {
979				fprintf(stderr, "line %d: %s: bad %s\n",
980				    lineno, tp, cp);
981				errors++;
982			} else
983				lp->d_ncylinders = v;
984			continue;
985		}
986		if (streq(cp, "rpm")) {
987			v = atoi(tp);
988			if (v <= 0) {
989				fprintf(stderr, "line %d: %s: bad %s\n",
990				    lineno, tp, cp);
991				errors++;
992			} else
993				lp->d_rpm = v;
994			continue;
995		}
996		if (streq(cp, "interleave")) {
997			v = atoi(tp);
998			if (v <= 0) {
999				fprintf(stderr, "line %d: %s: bad %s\n",
1000				    lineno, tp, cp);
1001				errors++;
1002			} else
1003				lp->d_interleave = v;
1004			continue;
1005		}
1006		if (streq(cp, "trackskew")) {
1007			v = atoi(tp);
1008			if (v < 0) {
1009				fprintf(stderr, "line %d: %s: bad %s\n",
1010				    lineno, tp, cp);
1011				errors++;
1012			} else
1013				lp->d_trackskew = v;
1014			continue;
1015		}
1016		if (streq(cp, "cylinderskew")) {
1017			v = atoi(tp);
1018			if (v < 0) {
1019				fprintf(stderr, "line %d: %s: bad %s\n",
1020				    lineno, tp, cp);
1021				errors++;
1022			} else
1023				lp->d_cylskew = v;
1024			continue;
1025		}
1026		if (streq(cp, "headswitch")) {
1027			v = atoi(tp);
1028			if (v < 0) {
1029				fprintf(stderr, "line %d: %s: bad %s\n",
1030				    lineno, tp, cp);
1031				errors++;
1032			} else
1033				lp->d_headswitch = v;
1034			continue;
1035		}
1036		if (streq(cp, "track-to-track seek")) {
1037			v = atoi(tp);
1038			if (v < 0) {
1039				fprintf(stderr, "line %d: %s: bad %s\n",
1040				    lineno, tp, cp);
1041				errors++;
1042			} else
1043				lp->d_trkseek = v;
1044			continue;
1045		}
1046		if ('a' <= *cp && *cp <= 'z' && cp[1] == '\0') {
1047			unsigned part = *cp - 'a';
1048
1049			if (part > lp->d_npartitions) {
1050				fprintf(stderr,
1051				    "line %d: bad partition name\n", lineno);
1052				errors++;
1053				continue;
1054			}
1055			pp = &lp->d_partitions[part];
1056#define NXTNUM(n) { \
1057	if (tp == NULL) { \
1058		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1059		errors++; \
1060		break; \
1061	} else { \
1062		cp = tp, tp = word(cp); \
1063		if (tp == NULL) \
1064			tp = cp; \
1065		(n) = atoi(cp); \
1066	} \
1067     }
1068
1069			NXTNUM(v);
1070			if (v < 0) {
1071				fprintf(stderr,
1072				    "line %d: %s: bad partition size\n",
1073				    lineno, cp);
1074				errors++;
1075			} else
1076				pp->p_size = v;
1077			NXTNUM(v);
1078			if (v < 0) {
1079				fprintf(stderr,
1080				    "line %d: %s: bad partition offset\n",
1081				    lineno, cp);
1082				errors++;
1083			} else
1084				pp->p_offset = v;
1085			cp = tp, tp = word(cp);
1086			cpp = fstypenames;
1087			for (; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1088				if ((s = *cpp) && streq(s, cp)) {
1089					pp->p_fstype = cpp - fstypenames;
1090					goto gottype;
1091				}
1092			if (isdigit(*cp))
1093				v = atoi(cp);
1094			else
1095				v = FSMAXTYPES;
1096			if ((unsigned)v >= FSMAXTYPES) {
1097				fprintf(stderr, "line %d: %s %s\n", lineno,
1098				    "Warning, unknown filesystem type", cp);
1099				v = FS_UNUSED;
1100			}
1101			pp->p_fstype = v;
1102	gottype:
1103
1104			switch (pp->p_fstype) {
1105
1106			case FS_UNUSED:				/* XXX */
1107				NXTNUM(pp->p_fsize);
1108				if (pp->p_fsize == 0)
1109					break;
1110				NXTNUM(v);
1111				pp->p_frag = v / pp->p_fsize;
1112				break;
1113
1114			case FS_BSDFFS:
1115				NXTNUM(pp->p_fsize);
1116				if (pp->p_fsize == 0)
1117					break;
1118				NXTNUM(v);
1119				pp->p_frag = v / pp->p_fsize;
1120				NXTNUM(pp->p_cpg);
1121				break;
1122
1123			default:
1124				break;
1125			}
1126			continue;
1127		}
1128		fprintf(stderr, "line %d: %s: Unknown disklabel field\n",
1129		    lineno, cp);
1130		errors++;
1131	next:
1132		;
1133	}
1134	errors += checklabel(lp);
1135	return (errors == 0);
1136}
1137
1138/*
1139 * Check disklabel for errors and fill in
1140 * derived fields according to supplied values.
1141 */
1142checklabel(lp)
1143	register struct disklabel *lp;
1144{
1145	register struct partition *pp;
1146	int i, errors = 0;
1147	char part;
1148
1149	if (lp->d_secsize == 0) {
1150		fprintf(stderr, "sector size %d\n", lp->d_secsize);
1151		return (1);
1152	}
1153	if (lp->d_nsectors == 0) {
1154		fprintf(stderr, "sectors/track %d\n", lp->d_nsectors);
1155		return (1);
1156	}
1157	if (lp->d_ntracks == 0) {
1158		fprintf(stderr, "tracks/cylinder %d\n", lp->d_ntracks);
1159		return (1);
1160	}
1161	if  (lp->d_ncylinders == 0) {
1162		fprintf(stderr, "cylinders/unit %d\n", lp->d_ncylinders);
1163		errors++;
1164	}
1165	if (lp->d_rpm == 0)
1166		Warning("revolutions/minute %d", lp->d_rpm);
1167	if (lp->d_secpercyl == 0)
1168		lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1169	if (lp->d_secperunit == 0)
1170		lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1171	if (lp->d_bbsize == 0) {
1172		fprintf(stderr, "boot block size %d\n", lp->d_bbsize);
1173		errors++;
1174	} else if (lp->d_bbsize % lp->d_secsize)
1175		Warning("boot block size %% sector-size != 0");
1176	if (lp->d_sbsize == 0) {
1177		fprintf(stderr, "super block size %d\n", lp->d_sbsize);
1178		errors++;
1179	} else if (lp->d_sbsize % lp->d_secsize)
1180		Warning("super block size %% sector-size != 0");
1181	if (lp->d_npartitions > MAXPARTITIONS)
1182		Warning("number of partitions (%d) > MAXPARTITIONS (%d)",
1183		    lp->d_npartitions, MAXPARTITIONS);
1184	for (i = 0; i < lp->d_npartitions; i++) {
1185		part = 'a' + i;
1186		pp = &lp->d_partitions[i];
1187		if (pp->p_size == 0 && pp->p_offset != 0)
1188			Warning("partition %c: size 0, but offset %d",
1189			    part, pp->p_offset);
1190#ifdef notdef
1191		if (pp->p_size % lp->d_secpercyl)
1192			Warning("partition %c: size %% cylinder-size != 0",
1193			    part);
1194		if (pp->p_offset % lp->d_secpercyl)
1195			Warning("partition %c: offset %% cylinder-size != 0",
1196			    part);
1197#endif
1198		if (pp->p_offset > lp->d_secperunit) {
1199			fprintf(stderr,
1200			    "partition %c: offset past end of unit\n", part);
1201			errors++;
1202		}
1203		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1204			fprintf(stderr,
1205			    "partition %c: partition extends past end of unit\n",
1206			    part);
1207			errors++;
1208		}
1209	}
1210	for (; i < MAXPARTITIONS; i++) {
1211		part = 'a' + i;
1212		pp = &lp->d_partitions[i];
1213		if (pp->p_size || pp->p_offset)
1214			Warning("unused partition %c: size %d offset %d",
1215			    'a' + i, pp->p_size, pp->p_offset);
1216	}
1217	return (errors);
1218}
1219
1220/*
1221 * If we are installing a boot program that doesn't fit in d_bbsize
1222 * we need to mark those partitions that the boot overflows into.
1223 * This allows newfs to prevent creation of a filesystem where it might
1224 * clobber bootstrap code.
1225 */
1226setbootflag(lp)
1227	register struct disklabel *lp;
1228{
1229	register struct partition *pp;
1230	int i, errors = 0;
1231	char part;
1232	u_long boffset;
1233
1234	if (bootbuf == 0)
1235		return;
1236	boffset = bootsize / lp->d_secsize;
1237	for (i = 0; i < lp->d_npartitions; i++) {
1238		part = 'a' + i;
1239		pp = &lp->d_partitions[i];
1240		if (pp->p_size == 0)
1241			continue;
1242		if (boffset <= pp->p_offset) {
1243			if (pp->p_fstype == FS_BOOT)
1244				pp->p_fstype = FS_UNUSED;
1245		} else if (pp->p_fstype != FS_BOOT) {
1246			if (pp->p_fstype != FS_UNUSED) {
1247				fprintf(stderr,
1248					"boot overlaps used partition %c\n",
1249					part);
1250				errors++;
1251			} else {
1252				pp->p_fstype = FS_BOOT;
1253				Warning("boot overlaps partition %c, %s",
1254					part, "marked as FS_BOOT");
1255			}
1256		}
1257	}
1258	if (errors) {
1259		fprintf(stderr, "Cannot install boot program\n");
1260		exit(4);
1261	}
1262}
1263
1264/*VARARGS1*/
1265Warning(fmt, a1, a2, a3, a4, a5)
1266	char *fmt;
1267{
1268
1269	fprintf(stderr, "Warning, ");
1270	fprintf(stderr, fmt, a1, a2, a3, a4, a5);
1271	fprintf(stderr, "\n");
1272}
1273
1274Perror(str)
1275	char *str;
1276{
1277	fputs("disklabel: ", stderr); perror(str);
1278	exit(4);
1279}
1280
1281usage()
1282{
1283#if NUMBOOT > 0
1284	fprintf(stderr,
1285"%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n%s\n\t%s\n",
1286"usage: disklabel [-r] disk",
1287		"(to read label)",
1288"or disklabel -w [-r] disk type [ packid ]",
1289		"(to write label with existing boot program)",
1290"or disklabel -e [-r] disk",
1291		"(to edit label)",
1292"or disklabel -R [-r] disk protofile",
1293		"(to restore label with existing boot program)",
1294#if NUMBOOT > 1
1295"or disklabel -B [ -b boot1 [ -s boot2 ] ] disk [ type ]",
1296		"(to install boot program with existing label)",
1297"or disklabel -w -B [ -b boot1 [ -s boot2 ] ] disk type [ packid ]",
1298		"(to write label and boot program)",
1299"or disklabel -R -B [ -b boot1 [ -s boot2 ] ] disk protofile [ type ]",
1300		"(to restore label and boot program)",
1301#else
1302"or disklabel -B [ -b bootprog ] disk [ type ]",
1303		"(to install boot program with existing on-disk label)",
1304"or disklabel -w -B [ -b bootprog ] disk type [ packid ]",
1305		"(to write label and install boot program)",
1306"or disklabel -R -B [ -b bootprog ] disk protofile [ type ]",
1307		"(to restore label and install boot program)",
1308#endif
1309"or disklabel [-NW] disk",
1310		"(to write disable/enable label)");
1311#else
1312	fprintf(stderr, "%-43s%s\n%-43s%s\n%-43s%s\n%-43s%s\n%-43s%s\n",
1313"usage: disklabel [-r] disk", "(to read label)",
1314"or disklabel -w [-r] disk type [ packid ]", "(to write label)",
1315"or disklabel -e [-r] disk", "(to edit label)",
1316"or disklabel -R [-r] disk protofile", "(to restore label)",
1317"or disklabel [-NW] disk", "(to write disable/enable label)");
1318#endif
1319	exit(1);
1320}
1321