[unix-history] / usr / src / sbin / fsck / setup.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)setup.c	5.7 (Berkeley) %G%";
#endif not lint

#define DKTYPENAMES
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <ctype.h>
#include "fsck.h"

#define POWEROF2(num)	(((num) & ((num) - 1)) == 0)

char	*calloc();
char	*index();

setup(dev)
	char *dev;
{
	dev_t rootdev;
	long cg, ncg, size, i, j;
	struct stat statb;
	struct fs proto;

	if (stat("/", &statb) < 0)
		errexit("Can't stat root\n");
	rootdev = statb.st_dev;
	if (stat(dev, &statb) < 0) {
		printf("Can't stat %s\n", dev);
		return (0);
	}
	rawflg = 0;
	if ((statb.st_mode & S_IFMT) == S_IFBLK)
		;
	else if ((statb.st_mode & S_IFMT) == S_IFCHR)
		rawflg++;
	else {
		if (reply("file is not a block or character device; OK") == 0)
			return (0);
	}
	if (rootdev == statb.st_rdev)
		hotroot++;
	if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) {
		printf("Can't open %s\n", dev);
		return (0);
	}
	if (preen == 0)
		printf("** %s", dev);
	if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) {
		dfile.wfdes = -1;
		if (preen)
			pfatal("NO WRITE ACCESS");
		printf(" (NO WRITE)");
	}
	if (preen == 0)
		printf("\n");
	dfile.mod = 0;
	lfdir = 0;
	initbarea(&sblk);
	initbarea(&fileblk);
	initbarea(&inoblk);
	initbarea(&cgblk);
	/*
	 * Read in the superblock, looking for alternates if necessary
	 */
	if (readsb(1) == 0) {
		if (bflag || calcsb(dev, dfile.rfdes, &proto) == 0 || preen)
			return(0);
		if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
			return (0);
		for (cg = 0; cg < proto.fs_ncg; cg++) {
			bflag = fsbtodb(&proto, cgsblock(&proto, cg));
			if (readsb(0) != 0)
				break;
		}
		if (cg >= proto.fs_ncg) {
			printf("%s %s\n%s %s\n%s %s\n",
				"SEARCH FOR ALTERNATE SUPER-BLOCK",
				"FAILED. YOU MUST USE THE",
				"-b OPTION TO FSCK TO SPECIFY THE",
				"LOCATION OF AN ALTERNATE",
				"SUPER-BLOCK TO SUPPLY NEEDED",
				"INFORMATION; SEE fsck(8).");
			return(0);
		}
		pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
	}
	fmax = sblock.fs_size;
	imax = sblock.fs_ncg * sblock.fs_ipg;
	/*
	 * Check and potentially fix certain fields in the super block.
	 */
	if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
		pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
		if (reply("SET TO DEFAULT") == 1) {
			sblock.fs_optim = FS_OPTTIME;
			sbdirty();
		}
	}
	if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
		pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
			sblock.fs_minfree);
		if (reply("SET TO DEFAULT") == 1) {
			sblock.fs_minfree = 10;
			sbdirty();
		}
	}
	if (sblock.fs_interleave < 1) {
		pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
			sblock.fs_interleave);
		if (reply("SET TO DEFAULT") == 1) {
			sblock.fs_interleave = 1;
			sbdirty();
		}
	}
	if (sblock.fs_npsect < sblock.fs_nsect) {
		pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
			sblock.fs_npsect);
		if (reply("SET TO DEFAULT") == 1) {
			sblock.fs_npsect = sblock.fs_nsect;
			sbdirty();
		}
	}
	/*
	 * read in the summary info.
	 */
	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
		size = sblock.fs_cssize - i < sblock.fs_bsize ?
		    sblock.fs_cssize - i : sblock.fs_bsize;
		sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
		if (bread(&dfile, (char *)sblock.fs_csp[j],
		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
		    size) != 0)
			return (0);
	}
	/*
	 * allocate and initialize the necessary maps
	 */
	bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
	blockmap = calloc((unsigned)bmapsz, sizeof (char));
	if (blockmap == NULL) {
		printf("cannot alloc %d bytes for blockmap\n", bmapsz);
		goto badsb;
	}
	statemap = calloc((unsigned)(imax + 1), sizeof(char));
	if (statemap == NULL) {
		printf("cannot alloc %d bytes for statemap\n", imax + 1);
		goto badsb;
	}
	lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
	if (lncntp == NULL) {
		printf("cannot alloc %d bytes for lncntp\n", 
		    (imax + 1) * sizeof(short));
		goto badsb;
	}

	return (1);

badsb:
	ckfini();
	return (0);
}

/*
 * Read in the super block and its summary info.
 */
readsb(listerr)
	int listerr;
{
	BUFAREA asblk;
#	define altsblock asblk.b_un.b_fs
	daddr_t super = bflag ? bflag : SBLOCK;

	initbarea(&asblk);
	dev_bsize = DEV_BSIZE;
	if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0)
		return (0);
	sblk.b_bno = super;
	sblk.b_size = SBSIZE;
	/*
	 * run a few consistency checks of the super block
	 */
	if (sblock.fs_magic != FS_MAGIC)
		{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
	if (sblock.fs_ncg < 1)
		{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
	if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG)
		{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
	if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
	    (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
		{ badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
	if (sblock.fs_sbsize > SBSIZE)
		{ badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
	/*
	 * Set all possible fields that could differ, then do check
	 * of whole super block against an alternate super block.
	 * When an alternate super-block is specified this check is skipped.
	 */
	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
	sblk.b_bno = sblk.b_bno * DEV_BSIZE / dev_bsize;
	if (bflag)
		return (1);
	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
	if (asblk.b_errs != NULL)
		return (0);
	altsblock.fs_link = sblock.fs_link;
	altsblock.fs_rlink = sblock.fs_rlink;
	altsblock.fs_time = sblock.fs_time;
	altsblock.fs_cstotal = sblock.fs_cstotal;
	altsblock.fs_cgrotor = sblock.fs_cgrotor;
	altsblock.fs_fmod = sblock.fs_fmod;
	altsblock.fs_clean = sblock.fs_clean;
	altsblock.fs_ronly = sblock.fs_ronly;
	altsblock.fs_flags = sblock.fs_flags;
	altsblock.fs_maxcontig = sblock.fs_maxcontig;
	altsblock.fs_minfree = sblock.fs_minfree;
	altsblock.fs_optim = sblock.fs_optim;
	altsblock.fs_rotdelay = sblock.fs_rotdelay;
	altsblock.fs_maxbpg = sblock.fs_maxbpg;
	altsblock.fs_npsect = sblock.fs_npsect;
	altsblock.fs_interleave = sblock.fs_interleave;
	bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp,
		sizeof sblock.fs_csp);
	bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt,
		sizeof sblock.fs_fsmnt);
	if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize))
		{ badsb(listerr, "TRASHED VALUES IN SUPER BLOCK"); return (0); }
	return (1);
#	undef altsblock
}

badsb(listerr, s)
	int listerr;
	char *s;
{

	if (!listerr)
		return;
	if (preen)
		printf("%s: ", devname);
	pfatal("BAD SUPER BLOCK: %s\n", s);
}

/*
 * Calculate a prototype superblock based on information in the disk label.
 * When done the cgsblock macro can be calculated and the fs_ncg field
 * can be used. Do NOT attempt to use other macros without verifying that
 * their needed information is available!
 */
calcsb(dev, devfd, fs)
	char *dev;
	int devfd;
	register struct fs *fs;
{
	register struct disklabel *lp;
	register struct partition *pp;
	register char *cp;
	struct disklabel *getdisklabel();
	int i;

	cp = index(dev, '\0') - 1;
	if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) {
		pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
		return (0);
	}
	lp = getdisklabel(dev, devfd);
	if (isdigit(*cp))
		pp = &lp->d_partitions[0];
	else
		pp = &lp->d_partitions[*cp - 'a'];
	if (pp->p_fstype != FS_BSDFFS) {
		pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n",
			dev, pp->p_fstype < FSMAXTYPES ?
			fstypenames[pp->p_fstype] : "unknown");
		return (0);
	}
	bzero(fs, sizeof(struct fs));
	fs->fs_fsize = pp->p_fsize;
	fs->fs_frag = pp->p_frag;
	fs->fs_cpg = pp->p_cpg;
	fs->fs_size = pp->p_size;
	fs->fs_ntrak = lp->d_ntracks;
	fs->fs_nsect = lp->d_nsectors;
	fs->fs_spc = lp->d_secpercyl;
	fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
	fs->fs_sblkno = roundup(
		howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
		fs->fs_frag);
	fs->fs_cgmask = 0xffffffff;
	for (i = fs->fs_ntrak; i > 1; i >>= 1)
		fs->fs_cgmask <<= 1;
	if (!POWEROF2(fs->fs_ntrak))
		fs->fs_cgmask <<= 1;
	fs->fs_cgoffset = roundup(
		howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
	fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
	fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
	for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
		fs->fs_fsbtodb++;
	return (1);
}

#ifdef byioctl
struct disklabel *
getdisklabel(s, fd)
	char *s;
	int	fd;
{
	static struct disklabel lab;

	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
		perror("ioctl (GDINFO)");
		fatal("%s: can't read disk label", s);
	}
	return (&lab);
}
#else byioctl
char specname[64];
char boot[BBSIZE];

struct disklabel *
getdisklabel(s, fd)
	char *s;
	int	fd;
{
	char *cp;
	u_long magic = htonl(DISKMAGIC);
	register struct disklabel *lp;
	int cfd;

	/*
	 * Make name for 'c' partition.
	 */
	strcpy(specname, s);
	cp = specname + strlen(specname) - 1;
	if (!isdigit(*cp))
		*cp = 'c';
	cfd = open(specname, O_RDONLY);
	if (cfd < 0) {
		perror(specname);
		exit(2);
	}

	if (read(cfd, boot, BBSIZE) < BBSIZE) {
		perror(specname);
		exit(2);
	}
	close(cfd);
	for (lp = (struct disklabel *)(boot + LABELOFFSET);
	    lp <= (struct disklabel *)(boot + BBSIZE -
	    sizeof(struct disklabel));
	    lp = (struct disklabel *)((char *)lp + 128))
		if (lp->d_magic == magic && lp->d_magic2 == magic)
			break;
	if (lp > (struct disklabel *)(boot + BBSIZE -
	    sizeof(struct disklabel)) ||
	    lp->d_magic != magic || lp->d_magic2 != magic ||
	    dkcksum(lp) != 0) {
		printf("Bad pack magic number %s\n",
			"(label is damaged, or pack is unlabeled)");
		exit(1);
	}
#if ENDIAN != BIG
	swablabel(lp);
#endif
	return (lp);
}
#endif byioctl
Commit	Line	Data
76797561 DF	1	/*
	2	* Copyright (c) 1980 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
eb93b62a	7	#ifndef lint
6eb81197	8	static char sccsid[] = "@(#)setup.c 5.7 (Berkeley) %G%";
76797561	9	#endif not lint
eb93b62a	10
c7aed003	11	#define DKTYPENAMES
eb93b62a KM	12	#include <sys/param.h>
	13	#include <sys/inode.h>
	14	#include <sys/fs.h>
	15	#include <sys/stat.h>
c7aed003 KM	16	#include <sys/ioctl.h>
	17	#include <sys/disklabel.h>
	18	#include <sys/file.h>
	19	#include <ctype.h>
eb93b62a KM	20	#include "fsck.h"
eb93b62a KM	21
c7aed003 KM	22	#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
c7aed003 KM	23
eb93b62a	24	char *calloc();
c7aed003	25	char *index();
eb93b62a KM	26
	27	setup(dev)
	28	char *dev;
	29	{
	30	dev_t rootdev;
c7aed003	31	long cg, ncg, size, i, j;
eb93b62a	32	struct stat statb;
c7aed003	33	struct fs proto;
eb93b62a KM	34
	35	if (stat("/", &statb) < 0)
	36	errexit("Can't stat root\n");
	37	rootdev = statb.st_dev;
	38	if (stat(dev, &statb) < 0) {
7718c0e6	39	printf("Can't stat %s\n", dev);
eb93b62a KM	40	return (0);
	41	}
	42	rawflg = 0;
	43	if ((statb.st_mode & S_IFMT) == S_IFBLK)
	44	;
	45	else if ((statb.st_mode & S_IFMT) == S_IFCHR)
	46	rawflg++;
	47	else {
	48	if (reply("file is not a block or character device; OK") == 0)
	49	return (0);
	50	}
	51	if (rootdev == statb.st_rdev)
	52	hotroot++;
c7aed003	53	if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) {
7718c0e6	54	printf("Can't open %s\n", dev);
eb93b62a KM	55	return (0);
	56	}
	57	if (preen == 0)
	58	printf("** %s", dev);
c7aed003	59	if (nflag \|\| (dfile.wfdes = open(dev, O_WRONLY)) < 0) {
eb93b62a KM	60	dfile.wfdes = -1;
	61	if (preen)
	62	pfatal("NO WRITE ACCESS");
	63	printf(" (NO WRITE)");
	64	}
	65	if (preen == 0)
	66	printf("\n");
eb93b62a	67	dfile.mod = 0;
eb93b62a	68	lfdir = 0;
eb93b62a KM	69	initbarea(&sblk);
	70	initbarea(&fileblk);
	71	initbarea(&inoblk);
	72	initbarea(&cgblk);
eb93b62a	73	/*
c7aed003	74	* Read in the superblock, looking for alternates if necessary
eb93b62a	75	*/
c7aed003 KM	76	if (readsb(1) == 0) {
	77	if (bflag \|\| calcsb(dev, dfile.rfdes, &proto) == 0 \|\| preen)
	78	return(0);
	79	if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
	80	return (0);
	81	for (cg = 0; cg < proto.fs_ncg; cg++) {
	82	bflag = fsbtodb(&proto, cgsblock(&proto, cg));
	83	if (readsb(0) != 0)
	84	break;
	85	}
	86	if (cg >= proto.fs_ncg) {
	87	printf("%s %s\n%s %s\n%s %s\n",
	88	"SEARCH FOR ALTERNATE SUPER-BLOCK",
	89	"FAILED. YOU MUST USE THE",
	90	"-b OPTION TO FSCK TO SPECIFY THE",
	91	"LOCATION OF AN ALTERNATE",
	92	"SUPER-BLOCK TO SUPPLY NEEDED",
	93	"INFORMATION; SEE fsck(8).");
	94	return(0);
	95	}
	96	pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
	97	}
	98	fmax = sblock.fs_size;
	99	imax = sblock.fs_ncg * sblock.fs_ipg;
d9f38d60 KM	100	/*
	101	* Check and potentially fix certain fields in the super block.
	102	*/
	103	if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
	104	pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
	105	if (reply("SET TO DEFAULT") == 1) {
	106	sblock.fs_optim = FS_OPTTIME;
	107	sbdirty();
	108	}
	109	}
	110	if ((sblock.fs_minfree < 0 \|\| sblock.fs_minfree > 99)) {
	111	pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
	112	sblock.fs_minfree);
	113	if (reply("SET TO DEFAULT") == 1) {
	114	sblock.fs_minfree = 10;
	115	sbdirty();
	116	}
	117	}
d4af1a46 KM	118	if (sblock.fs_interleave < 1) {
	119	pfatal("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
	120	sblock.fs_interleave);
	121	if (reply("SET TO DEFAULT") == 1) {
	122	sblock.fs_interleave = 1;
	123	sbdirty();
	124	}
	125	}
	126	if (sblock.fs_npsect < sblock.fs_nsect) {
	127	pfatal("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
	128	sblock.fs_npsect);
	129	if (reply("SET TO DEFAULT") == 1) {
	130	sblock.fs_npsect = sblock.fs_nsect;
	131	sbdirty();
	132	}
	133	}
eb93b62a KM	134	/*
	135	* read in the summary info.
	136	*/
	137	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
	138	size = sblock.fs_cssize - i < sblock.fs_bsize ?
	139	sblock.fs_cssize - i : sblock.fs_bsize;
	140	sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
	141	if (bread(&dfile, (char *)sblock.fs_csp[j],
	142	fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
49505034	143	size) != 0)
eb93b62a KM	144	return (0);
	145	}
	146	/*
	147	* allocate and initialize the necessary maps
	148	*/
	149	bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
	150	blockmap = calloc((unsigned)bmapsz, sizeof (char));
	151	if (blockmap == NULL) {
	152	printf("cannot alloc %d bytes for blockmap\n", bmapsz);
	153	goto badsb;
	154	}
eb93b62a KM	155	statemap = calloc((unsigned)(imax + 1), sizeof(char));
	156	if (statemap == NULL) {
	157	printf("cannot alloc %d bytes for statemap\n", imax + 1);
	158	goto badsb;
	159	}
	160	lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
	161	if (lncntp == NULL) {
	162	printf("cannot alloc %d bytes for lncntp\n",
	163	(imax + 1) * sizeof(short));
	164	goto badsb;
	165	}
eb93b62a KM	166
	167	return (1);
	168
	169	badsb:
	170	ckfini();
	171	return (0);
c7aed003 KM	172	}
	173
	174	/*
	175	* Read in the super block and its summary info.
	176	*/
	177	readsb(listerr)
	178	int listerr;
	179	{
	180	BUFAREA asblk;
	181	# define altsblock asblk.b_un.b_fs
	182	daddr_t super = bflag ? bflag : SBLOCK;
	183
	184	initbarea(&asblk);
6eb81197	185	dev_bsize = DEV_BSIZE;
c7aed003 KM	186	if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0)
	187	return (0);
	188	sblk.b_bno = super;
	189	sblk.b_size = SBSIZE;
	190	/*
	191	* run a few consistency checks of the super block
	192	*/
	193	if (sblock.fs_magic != FS_MAGIC)
	194	{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
	195	if (sblock.fs_ncg < 1)
	196	{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
	197	if (sblock.fs_cpg < 1 \|\| sblock.fs_cpg > MAXCPG)
	198	{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
	199	if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl \|\|
	200	(sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
	201	{ badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
	202	if (sblock.fs_sbsize > SBSIZE)
	203	{ badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
	204	/*
	205	* Set all possible fields that could differ, then do check
	206	* of whole super block against an alternate super block.
	207	* When an alternate super-block is specified this check is skipped.
	208	*/
6eb81197 KM	209	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
6eb81197 KM	210	sblk.b_bno = sblk.b_bno * DEV_BSIZE / dev_bsize;
c7aed003 KM	211	if (bflag)
	212	return (1);
	213	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
	214	if (asblk.b_errs != NULL)
	215	return (0);
	216	altsblock.fs_link = sblock.fs_link;
	217	altsblock.fs_rlink = sblock.fs_rlink;
	218	altsblock.fs_time = sblock.fs_time;
	219	altsblock.fs_cstotal = sblock.fs_cstotal;
	220	altsblock.fs_cgrotor = sblock.fs_cgrotor;
	221	altsblock.fs_fmod = sblock.fs_fmod;
	222	altsblock.fs_clean = sblock.fs_clean;
	223	altsblock.fs_ronly = sblock.fs_ronly;
	224	altsblock.fs_flags = sblock.fs_flags;
	225	altsblock.fs_maxcontig = sblock.fs_maxcontig;
	226	altsblock.fs_minfree = sblock.fs_minfree;
	227	altsblock.fs_optim = sblock.fs_optim;
	228	altsblock.fs_rotdelay = sblock.fs_rotdelay;
	229	altsblock.fs_maxbpg = sblock.fs_maxbpg;
938edf28 KM	230	altsblock.fs_npsect = sblock.fs_npsect;
938edf28 KM	231	altsblock.fs_interleave = sblock.fs_interleave;
c7aed003 KM	232	bcopy((char )sblock.fs_csp, (char )altsblock.fs_csp,
	233	sizeof sblock.fs_csp);
	234	bcopy((char )sblock.fs_fsmnt, (char )altsblock.fs_fsmnt,
	235	sizeof sblock.fs_fsmnt);
	236	if (bcmp((char )&sblock, (char )&altsblock, (int)sblock.fs_sbsize))
	237	{ badsb(listerr, "TRASHED VALUES IN SUPER BLOCK"); return (0); }
	238	return (1);
eb93b62a KM	239	# undef altsblock
	240	}
	241
c7aed003 KM	242	badsb(listerr, s)
c7aed003 KM	243	int listerr;
eb93b62a KM	244	char *s;
	245	{
	246
c7aed003 KM	247	if (!listerr)
c7aed003 KM	248	return;
eb93b62a KM	249	if (preen)
eb93b62a KM	250	printf("%s: ", devname);
c7aed003 KM	251	pfatal("BAD SUPER BLOCK: %s\n", s);
	252	}
	253
	254	/*
	255	* Calculate a prototype superblock based on information in the disk label.
	256	* When done the cgsblock macro can be calculated and the fs_ncg field
	257	* can be used. Do NOT attempt to use other macros without verifying that
	258	* their needed information is available!
	259	*/
	260	calcsb(dev, devfd, fs)
	261	char *dev;
	262	int devfd;
	263	register struct fs *fs;
	264	{
	265	register struct disklabel *lp;
	266	register struct partition *pp;
	267	register char *cp;
	268	struct disklabel *getdisklabel();
	269	int i;
	270
	271	cp = index(dev, '\0') - 1;
	272	if (cp == (char )-1 \|\| (cp < 'a' \|\| cp > 'h') && !isdigit(cp)) {
	273	pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
	274	return (0);
	275	}
	276	lp = getdisklabel(dev, devfd);
	277	if (isdigit(*cp))
	278	pp = &lp->d_partitions[0];
	279	else
	280	pp = &lp->d_partitions[*cp - 'a'];
	281	if (pp->p_fstype != FS_BSDFFS) {
	282	pfatal("%s: NOT FORMATTED AS A BSD FILE SYSTEM (%s)\n",
	283	dev, pp->p_fstype < FSMAXTYPES ?
	284	fstypenames[pp->p_fstype] : "unknown");
	285	return (0);
	286	}
	287	bzero(fs, sizeof(struct fs));
	288	fs->fs_fsize = pp->p_fsize;
	289	fs->fs_frag = pp->p_frag;
	290	fs->fs_cpg = pp->p_cpg;
	291	fs->fs_size = pp->p_size;
	292	fs->fs_ntrak = lp->d_ntracks;
	293	fs->fs_nsect = lp->d_nsectors;
	294	fs->fs_spc = lp->d_secpercyl;
	295	fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
	296	fs->fs_sblkno = roundup(
	297	howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
	298	fs->fs_frag);
	299	fs->fs_cgmask = 0xffffffff;
	300	for (i = fs->fs_ntrak; i > 1; i >>= 1)
	301	fs->fs_cgmask <<= 1;
	302	if (!POWEROF2(fs->fs_ntrak))
	303	fs->fs_cgmask <<= 1;
	304	fs->fs_cgoffset = roundup(
	305	howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
	306	fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
	307	fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
	308	for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
	309	fs->fs_fsbtodb++;
	310	return (1);
	311	}
	312
	313	#ifdef byioctl
	314	struct disklabel *
315	getdisklabel(s, fd)
316	char *s;
317	int fd;
318	{
319	static struct disklabel lab;
320
321	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
322	perror("ioctl (GDINFO)");
323	fatal("%s: can't read disk label", s);
324	}
325	return (&lab);
326	}
327	#else byioctl
328	char specname[64];
329	char boot[BBSIZE];
330
331	struct disklabel *
332	getdisklabel(s, fd)
333	char *s;
334	int fd;
335	{
336	char *cp;
337	u_long magic = htonl(DISKMAGIC);
338	register struct disklabel *lp;
339	int cfd;
340
341	/*
342	* Make name for 'c' partition.
343	*/
344	strcpy(specname, s);
345	cp = specname + strlen(specname) - 1;
346	if (!isdigit(*cp))
347	*cp = 'c';
348	cfd = open(specname, O_RDONLY);
349	if (cfd < 0) {
350	perror(specname);
351	exit(2);
352	}
353
354	if (read(cfd, boot, BBSIZE) < BBSIZE) {
355	perror(specname);
356	exit(2);
357	}
358	close(cfd);
359	for (lp = (struct disklabel *)(boot + LABELOFFSET);
360	lp <= (struct disklabel *)(boot + BBSIZE -
361	sizeof(struct disklabel));
362	lp = (struct disklabel )((char )lp + 128))
363	if (lp->d_magic == magic && lp->d_magic2 == magic)
364	break;
365	if (lp > (struct disklabel *)(boot + BBSIZE -
366	sizeof(struct disklabel)) \|\|
367	lp->d_magic != magic \|\| lp->d_magic2 != magic \|\|
368	dkcksum(lp) != 0) {
369	printf("Bad pack magic number %s\n",
370	"(label is damaged, or pack is unlabeled)");
371	exit(1);
372	}
373	#if ENDIAN != BIG
374	swablabel(lp);
375	#endif
376	return (lp);
eb93b62a	377	}
c7aed003	378	#endif byioctl