[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	5.21 (Berkeley) %G%";
#endif not lint

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

BUFAREA asblk;
#define altsblock (*asblk.b_un.b_fs)
#define POWEROF2(num)	(((num) & ((num) - 1)) == 0)

/*
 * The size of a cylinder group is calculated by CGSIZE. The maximum size
 * is limited by the fact that cylinder groups are at most one block.
 * Its size is derived from the size of the maps maintained in the 
 * cylinder group and the (struct cg) size.
 */
#define CGSIZE(fs) \
    /* base cg */	(sizeof(struct cg) + \
    /* blktot size */	(fs)->fs_cpg * sizeof(long) + \
    /* blks size */	(fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \
    /* inode map */	howmany((fs)->fs_ipg, NBBY) + \
    /* block map */	howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY))

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

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

	havesb = 0;
	if (stat("/", &statb) < 0)
		errexit("Can't stat root\n");
	rootdev = statb.st_dev;
	if (stat(dev, &statb) < 0) {
		perror(dev);
		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) {
		perror(dev);
		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(&asblk);
	sblk.b_un.b_buf = (char *)malloc(SBSIZE);
	asblk.b_un.b_buf = (char *)malloc(SBSIZE);
	if (sblk.b_un.b_buf == 0 || asblk.b_un.b_buf == 0)
		errexit("cannot allocate space for superblock\n");
	if (lp = getdisklabel((char *)NULL, dfile.rfdes))
		dev_bsize = secsize = lp->d_secsize;
	else
		dev_bsize = secsize = DEV_BSIZE;
	/*
	 * Read in the superblock, looking for alternates if necessary
	 */
	if (readsb(1) == 0) {
		if (bflag || preen || calcsb(dev, dfile.rfdes, &proto) == 0)
			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) {
			sblock.fs_interleave);
		sblock.fs_interleave = 1;
			sbdirty();
			dirty(&asblk);
		}
	}
	if (sblock.fs_npsect < sblock.fs_nsect) {
			sblock.fs_npsect);
		sblock.fs_npsect = sblock.fs_nsect;
			sbdirty();
			dirty(&asblk);
		}
	}
	if (cvtflag) {
		if (sblock.fs_postblformat == FS_42POSTBLFMT) {
			/*
			 * Requested to convert from old format to new format
			 */
			if (preen)
				pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n");
			else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT"))
				return(0);
			sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
			sblock.fs_nrpos = 8;
			sblock.fs_postbloff =
			    (char *)(&sblock.fs_opostbl[0][0]) -
			    (char *)(&sblock.fs_link);
			sblock.fs_rotbloff = &sblock.fs_space[0] -
			    (u_char *)(&sblock.fs_link);
			sblock.fs_cgsize =
				fragroundup(&sblock, CGSIZE(&sblock));
			/*
			 * Planning now for future expansion.
			 */
#			if (BYTE_ORDER == BIG_ENDIAN)
				sblock.fs_qbmask.val[0] = 0;
				sblock.fs_qbmask.val[1] = ~sblock.fs_bmask;
				sblock.fs_qfmask.val[0] = 0;
				sblock.fs_qfmask.val[1] = ~sblock.fs_fmask;
#			endif /* BIG_ENDIAN */
#			if (BYTE_ORDER == LITTLE_ENDIAN)
				sblock.fs_qbmask.val[0] = ~sblock.fs_bmask;
				sblock.fs_qbmask.val[1] = 0;
				sblock.fs_qfmask.val[0] = ~sblock.fs_fmask;
				sblock.fs_qfmask.val[1] = 0;
#			endif /* LITTLE_ENDIAN */
			sbdirty();
			dirty(&asblk);
		} else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) {
			/*
			 * Requested to convert from new format to old format
			 */
			if (sblock.fs_nrpos != 8 || sblock.fs_ipg > 2048 ||
			    sblock.fs_cpg > 32 || sblock.fs_cpc > 16) {
				printf(
				"PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t");
				errexit(
				"ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n");
			}
			if (preen)
				pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n");
			else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT"))
				return(0);
			sblock.fs_postblformat = FS_42POSTBLFMT;
			sblock.fs_cgsize = fragroundup(&sblock,
			    sizeof(struct ocg) + howmany(sblock.fs_fpg, NBBY));
			sbdirty();
			dirty(&asblk);
		} else {
			errexit("UNKNOWN FILE SYSTEM FORMAT\n");
		}
	}
	if (asblk.b_dirty) {
		bcopy((char *)&sblock, (char *)&altsblock, sblock.fs_sbsize);
		flush(&dfile, &asblk);
	}
	/*
	 * read in the summary info.
	 */
	asked = 0;
	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 && !asked) {
			pfatal("BAD SUMMARY INFORMATION");
			if (reply("CONTINUE") == 0)
				errexit("");
			asked++;
		}
	}
	/*
	 * 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;
	}

	bufinit();
	return (1);

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

/*
 * Read in the super block and its summary info.
 */
readsb(listerr)
	int listerr;
{
	off_t sboff;
	daddr_t super = bflag ? bflag : SBOFF / 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)
		{ 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); }
	/*
	 * Compute block size that the filesystem is based on,
	 * according to fsbtodb, and adjust superblock block number
	 * so we can tell if this is an alternate later.
	 */
	super *= dev_bsize;
	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
	sblk.b_bno = super / dev_bsize;
	/*
	 * 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.
	 */
	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
	if (asblk.b_errs != NULL)
		return (0);
	if (bflag) {
		havesb = 1;
		return (1);
	}
	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;
	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);
	bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon,
		sizeof sblock.fs_sparecon);
	/*
	 * The following should not have to be copied.
	 */
	altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
	altsblock.fs_interleave = sblock.fs_interleave;
	altsblock.fs_npsect = sblock.fs_npsect;
	altsblock.fs_nrpos = sblock.fs_nrpos;
	if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) {
		badsb(listerr,
		"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
		return (0);
	}
	havesb = 1;
	return (1);
}

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;
	int i;
	struct disklabel *getdisklabel();

	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 LABELED 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++;
	dev_bsize = lp->d_secsize;
	return (1);
}

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

	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
		if (s == NULL)
			return ((struct disklabel *)NULL);
		pwarn("");
		perror("ioctl (GDINFO)");
		errexit("%s: can't read disk label", s);
	}
	return (&lab);
}
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
5c175a19	8	static char sccsid[] = "@(#)setup.c 5.21 (Berkeley) %G%";
76797561	9	#endif not lint
eb93b62a	10
c7aed003	11	#define DKTYPENAMES
eb93b62a	12	#include <sys/param.h>
5c175a19 KM	13	#include <sys/time.h>
	14	#include <sys/vnode.h>
	15	#include <ufs/inode.h>
	16	#include <ufs/fs.h>
eb93b62a	17	#include <sys/stat.h>
c7aed003 KM	18	#include <sys/ioctl.h>
	19	#include <sys/disklabel.h>
	20	#include <sys/file.h>
7beeecfc	21	#include <machine/endian.h>
c7aed003	22	#include <ctype.h>
eb93b62a KM	23	#include "fsck.h"
eb93b62a KM	24
7beeecfc	25	BUFAREA asblk;
adc5a10c	26	#define altsblock (*asblk.b_un.b_fs)
c7aed003 KM	27	#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
c7aed003 KM	28
be894f48 KM	29	/*
	30	* The size of a cylinder group is calculated by CGSIZE. The maximum size
	31	* is limited by the fact that cylinder groups are at most one block.
	32	* Its size is derived from the size of the maps maintained in the
	33	* cylinder group and the (struct cg) size.
	34	*/
	35	#define CGSIZE(fs) \
	36	/* base cg */ (sizeof(struct cg) + \
	37	/* blktot size / (fs)->fs_cpg sizeof(long) + \
	38	/* blks size / (fs)->fs_cpg (fs)->fs_nrpos * sizeof(short) + \
	39	/* inode map */ howmany((fs)->fs_ipg, NBBY) + \
	40	/* block map / howmany((fs)->fs_cpg (fs)->fs_spc / NSPF(fs), NBBY))
	41
eb93b62a	42	char *calloc();
c7aed003	43	char *index();
eb93b62a KM	44
	45	setup(dev)
	46	char *dev;
	47	{
	48	dev_t rootdev;
05d069d3	49	long cg, ncg, size, asked, i, j;
55f8bbd7	50	struct disklabel getdisklabel(), lp;
eb93b62a	51	struct stat statb;
c7aed003	52	struct fs proto;
eb93b62a	53
55f8bbd7	54	havesb = 0;
eb93b62a KM	55	if (stat("/", &statb) < 0)
	56	errexit("Can't stat root\n");
	57	rootdev = statb.st_dev;
	58	if (stat(dev, &statb) < 0) {
cfbff64d	59	perror(dev);
7718c0e6	60	printf("Can't stat %s\n", dev);
eb93b62a KM	61	return (0);
	62	}
	63	rawflg = 0;
	64	if ((statb.st_mode & S_IFMT) == S_IFBLK)
	65	;
	66	else if ((statb.st_mode & S_IFMT) == S_IFCHR)
	67	rawflg++;
	68	else {
	69	if (reply("file is not a block or character device; OK") == 0)
	70	return (0);
	71	}
	72	if (rootdev == statb.st_rdev)
	73	hotroot++;
c7aed003	74	if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) {
cfbff64d	75	perror(dev);
7718c0e6	76	printf("Can't open %s\n", dev);
eb93b62a KM	77	return (0);
	78	}
	79	if (preen == 0)
	80	printf("** %s", dev);
c7aed003	81	if (nflag \|\| (dfile.wfdes = open(dev, O_WRONLY)) < 0) {
eb93b62a KM	82	dfile.wfdes = -1;
	83	if (preen)
	84	pfatal("NO WRITE ACCESS");
	85	printf(" (NO WRITE)");
	86	}
	87	if (preen == 0)
	88	printf("\n");
eb93b62a	89	dfile.mod = 0;
eb93b62a	90	lfdir = 0;
eb93b62a	91	initbarea(&sblk);
7beeecfc	92	initbarea(&asblk);
adc5a10c KM	93	sblk.b_un.b_buf = (char *)malloc(SBSIZE);
	94	asblk.b_un.b_buf = (char *)malloc(SBSIZE);
	95	if (sblk.b_un.b_buf == 0 \|\| asblk.b_un.b_buf == 0)
	96	errexit("cannot allocate space for superblock\n");
55f8bbd7 MK	97	if (lp = getdisklabel((char *)NULL, dfile.rfdes))
55f8bbd7 MK	98	dev_bsize = secsize = lp->d_secsize;
7beeecfc KM	99	else
7beeecfc KM	100	dev_bsize = secsize = DEV_BSIZE;
eb93b62a	101	/*
c7aed003	102	* Read in the superblock, looking for alternates if necessary
eb93b62a	103	*/
c7aed003	104	if (readsb(1) == 0) {
55f8bbd7	105	if (bflag \|\| preen \|\| calcsb(dev, dfile.rfdes, &proto) == 0)
c7aed003 KM	106	return(0);
	107	if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
	108	return (0);
	109	for (cg = 0; cg < proto.fs_ncg; cg++) {
	110	bflag = fsbtodb(&proto, cgsblock(&proto, cg));
	111	if (readsb(0) != 0)
	112	break;
	113	}
	114	if (cg >= proto.fs_ncg) {
	115	printf("%s %s\n%s %s\n%s %s\n",
	116	"SEARCH FOR ALTERNATE SUPER-BLOCK",
	117	"FAILED. YOU MUST USE THE",
	118	"-b OPTION TO FSCK TO SPECIFY THE",
	119	"LOCATION OF AN ALTERNATE",
	120	"SUPER-BLOCK TO SUPPLY NEEDED",
	121	"INFORMATION; SEE fsck(8).");
	122	return(0);
	123	}
	124	pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
	125	}
	126	fmax = sblock.fs_size;
	127	imax = sblock.fs_ncg * sblock.fs_ipg;
d9f38d60 KM	128	/*
	129	* Check and potentially fix certain fields in the super block.
	130	*/
	131	if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
	132	pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
	133	if (reply("SET TO DEFAULT") == 1) {
	134	sblock.fs_optim = FS_OPTTIME;
	135	sbdirty();
	136	}
	137	}
	138	if ((sblock.fs_minfree < 0 \|\| sblock.fs_minfree > 99)) {
	139	pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
	140	sblock.fs_minfree);
	141	if (reply("SET TO DEFAULT") == 1) {
	142	sblock.fs_minfree = 10;
	143	sbdirty();
	144	}
	145	}
d4af1a46	146	if (sblock.fs_interleave < 1) {
d4af1a46	147	sblock.fs_interleave);
43171015	148	sblock.fs_interleave = 1;
d4af1a46	149	sbdirty();
7beeecfc KM	150	dirty(&asblk);
7beeecfc KM	151	}
d4af1a46 KM	152	}
d4af1a46 KM	153	if (sblock.fs_npsect < sblock.fs_nsect) {
d4af1a46	154	sblock.fs_npsect);
43171015	155	sblock.fs_npsect = sblock.fs_nsect;
d4af1a46	156	sbdirty();
7beeecfc KM	157	dirty(&asblk);
	158	}
	159	}
a747b5d4 KM	160	if (cvtflag) {
	161	if (sblock.fs_postblformat == FS_42POSTBLFMT) {
	162	/*
	163	* Requested to convert from old format to new format
	164	*/
	165	if (preen)
	166	pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n");
	167	else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT"))
	168	return(0);
7beeecfc KM	169	sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
	170	sblock.fs_nrpos = 8;
	171	sblock.fs_postbloff =
	172	(char *)(&sblock.fs_opostbl[0][0]) -
	173	(char *)(&sblock.fs_link);
	174	sblock.fs_rotbloff = &sblock.fs_space[0] -
	175	(u_char *)(&sblock.fs_link);
be894f48 KM	176	sblock.fs_cgsize =
be894f48 KM	177	fragroundup(&sblock, CGSIZE(&sblock));
7beeecfc KM	178	/*
	179	* Planning now for future expansion.
	180	*/
	181	# if (BYTE_ORDER == BIG_ENDIAN)
	182	sblock.fs_qbmask.val[0] = 0;
	183	sblock.fs_qbmask.val[1] = ~sblock.fs_bmask;
	184	sblock.fs_qfmask.val[0] = 0;
	185	sblock.fs_qfmask.val[1] = ~sblock.fs_fmask;
	186	# endif /* BIG_ENDIAN */
	187	# if (BYTE_ORDER == LITTLE_ENDIAN)
	188	sblock.fs_qbmask.val[0] = ~sblock.fs_bmask;
	189	sblock.fs_qbmask.val[1] = 0;
	190	sblock.fs_qfmask.val[0] = ~sblock.fs_fmask;
	191	sblock.fs_qfmask.val[1] = 0;
	192	# endif /* LITTLE_ENDIAN */
	193	sbdirty();
	194	dirty(&asblk);
a747b5d4 KM	195	} else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) {
	196	/*
	197	* Requested to convert from new format to old format
	198	*/
	199	if (sblock.fs_nrpos != 8 \|\| sblock.fs_ipg > 2048 \|\|
	200	sblock.fs_cpg > 32 \|\| sblock.fs_cpc > 16) {
	201	printf(
	202	"PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t");
	203	errexit(
	204	"ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n");
	205	}
	206	if (preen)
	207	pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n");
	208	else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT"))
	209	return(0);
	210	sblock.fs_postblformat = FS_42POSTBLFMT;
be894f48 KM	211	sblock.fs_cgsize = fragroundup(&sblock,
be894f48 KM	212	sizeof(struct ocg) + howmany(sblock.fs_fpg, NBBY));
a747b5d4 KM	213	sbdirty();
	214	dirty(&asblk);
	215	} else {
	216	errexit("UNKNOWN FILE SYSTEM FORMAT\n");
7beeecfc	217	}
7beeecfc KM	218	}
	219	if (asblk.b_dirty) {
	220	bcopy((char )&sblock, (char )&altsblock, sblock.fs_sbsize);
	221	flush(&dfile, &asblk);
d4af1a46	222	}
eb93b62a KM	223	/*
	224	* read in the summary info.
	225	*/
05d069d3	226	asked = 0;
eb93b62a KM	227	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
	228	size = sblock.fs_cssize - i < sblock.fs_bsize ?
	229	sblock.fs_cssize - i : sblock.fs_bsize;
	230	sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
	231	if (bread(&dfile, (char *)sblock.fs_csp[j],
	232	fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
05d069d3 KM	233	size) != 0 && !asked) {
	234	pfatal("BAD SUMMARY INFORMATION");
	235	if (reply("CONTINUE") == 0)
	236	errexit("");
	237	asked++;
	238	}
eb93b62a KM	239	}
	240	/*
	241	* allocate and initialize the necessary maps
	242	*/
	243	bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
	244	blockmap = calloc((unsigned)bmapsz, sizeof (char));
	245	if (blockmap == NULL) {
	246	printf("cannot alloc %d bytes for blockmap\n", bmapsz);
	247	goto badsb;
	248	}
eb93b62a KM	249	statemap = calloc((unsigned)(imax + 1), sizeof(char));
	250	if (statemap == NULL) {
	251	printf("cannot alloc %d bytes for statemap\n", imax + 1);
	252	goto badsb;
	253	}
	254	lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
	255	if (lncntp == NULL) {
	256	printf("cannot alloc %d bytes for lncntp\n",
	257	(imax + 1) * sizeof(short));
	258	goto badsb;
	259	}
eb93b62a	260
adc5a10c	261	bufinit();
eb93b62a KM	262	return (1);
	263
	264	badsb:
	265	ckfini();
	266	return (0);
c7aed003 KM	267	}
	268
	269	/*
	270	* Read in the super block and its summary info.
	271	*/
	272	readsb(listerr)
	273	int listerr;
	274	{
55f8bbd7 MK	275	off_t sboff;
55f8bbd7 MK	276	daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
c7aed003	277
c7aed003 KM	278	if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0)
	279	return (0);
	280	sblk.b_bno = super;
	281	sblk.b_size = SBSIZE;
	282	/*
	283	* run a few consistency checks of the super block
	284	*/
	285	if (sblock.fs_magic != FS_MAGIC)
	286	{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
	287	if (sblock.fs_ncg < 1)
	288	{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
7beeecfc	289	if (sblock.fs_cpg < 1)
c7aed003 KM	290	{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
	291	if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl \|\|
	292	(sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
	293	{ badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
	294	if (sblock.fs_sbsize > SBSIZE)
	295	{ badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
55f8bbd7 MK	296	/*
	297	* Compute block size that the filesystem is based on,
	298	* according to fsbtodb, and adjust superblock block number
	299	* so we can tell if this is an alternate later.
	300	*/
55f8bbd7 MK	301	super *= dev_bsize;
	302	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
	303	sblk.b_bno = super / dev_bsize;
c7aed003 KM	304	/*
	305	* Set all possible fields that could differ, then do check
	306	* of whole super block against an alternate super block.
	307	* When an alternate super-block is specified this check is skipped.
	308	*/
7beeecfc KM	309	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
	310	if (asblk.b_errs != NULL)
	311	return (0);
55f8bbd7 MK	312	if (bflag) {
55f8bbd7 MK	313	havesb = 1;
c7aed003	314	return (1);
55f8bbd7	315	}
c7aed003 KM	316	altsblock.fs_link = sblock.fs_link;
	317	altsblock.fs_rlink = sblock.fs_rlink;
	318	altsblock.fs_time = sblock.fs_time;
	319	altsblock.fs_cstotal = sblock.fs_cstotal;
	320	altsblock.fs_cgrotor = sblock.fs_cgrotor;
	321	altsblock.fs_fmod = sblock.fs_fmod;
	322	altsblock.fs_clean = sblock.fs_clean;
	323	altsblock.fs_ronly = sblock.fs_ronly;
	324	altsblock.fs_flags = sblock.fs_flags;
	325	altsblock.fs_maxcontig = sblock.fs_maxcontig;
	326	altsblock.fs_minfree = sblock.fs_minfree;
	327	altsblock.fs_optim = sblock.fs_optim;
	328	altsblock.fs_rotdelay = sblock.fs_rotdelay;
	329	altsblock.fs_maxbpg = sblock.fs_maxbpg;
	330	bcopy((char )sblock.fs_csp, (char )altsblock.fs_csp,
	331	sizeof sblock.fs_csp);
	332	bcopy((char )sblock.fs_fsmnt, (char )altsblock.fs_fsmnt,
	333	sizeof sblock.fs_fsmnt);
cfbff64d MK	334	bcopy((char )sblock.fs_sparecon, (char )altsblock.fs_sparecon,
cfbff64d MK	335	sizeof sblock.fs_sparecon);
7beeecfc KM	336	/*
	337	* The following should not have to be copied.
	338	*/
	339	altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
	340	altsblock.fs_interleave = sblock.fs_interleave;
	341	altsblock.fs_npsect = sblock.fs_npsect;
	342	altsblock.fs_nrpos = sblock.fs_nrpos;
cfbff64d MK	343	if (bcmp((char )&sblock, (char )&altsblock, (int)sblock.fs_sbsize)) {
	344	badsb(listerr,
	345	"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
	346	return (0);
	347	}
55f8bbd7	348	havesb = 1;
c7aed003	349	return (1);
eb93b62a KM	350	}
eb93b62a KM	351
c7aed003 KM	352	badsb(listerr, s)
c7aed003 KM	353	int listerr;
eb93b62a KM	354	char *s;
	355	{
	356
c7aed003 KM	357	if (!listerr)
c7aed003 KM	358	return;
eb93b62a KM	359	if (preen)
eb93b62a KM	360	printf("%s: ", devname);
c7aed003 KM	361	pfatal("BAD SUPER BLOCK: %s\n", s);
	362	}
	363
	364	/*
	365	* Calculate a prototype superblock based on information in the disk label.
	366	* When done the cgsblock macro can be calculated and the fs_ncg field
	367	* can be used. Do NOT attempt to use other macros without verifying that
	368	* their needed information is available!
	369	*/
	370	calcsb(dev, devfd, fs)
	371	char *dev;
	372	int devfd;
	373	register struct fs *fs;
	374	{
	375	register struct disklabel *lp;
	376	register struct partition *pp;
	377	register char *cp;
c7aed003	378	int i;
f10a0ae9	379	struct disklabel *getdisklabel();
c7aed003 KM	380
	381	cp = index(dev, '\0') - 1;
	382	if (cp == (char )-1 \|\| (cp < 'a' \|\| cp > 'h') && !isdigit(cp)) {
	383	pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
	384	return (0);
	385	}
	386	lp = getdisklabel(dev, devfd);
	387	if (isdigit(*cp))
	388	pp = &lp->d_partitions[0];
	389	else
	390	pp = &lp->d_partitions[*cp - 'a'];
	391	if (pp->p_fstype != FS_BSDFFS) {
55f8bbd7	392	pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
c7aed003 KM	393	dev, pp->p_fstype < FSMAXTYPES ?
	394	fstypenames[pp->p_fstype] : "unknown");
	395	return (0);
	396	}
	397	bzero(fs, sizeof(struct fs));
	398	fs->fs_fsize = pp->p_fsize;
	399	fs->fs_frag = pp->p_frag;
	400	fs->fs_cpg = pp->p_cpg;
	401	fs->fs_size = pp->p_size;
	402	fs->fs_ntrak = lp->d_ntracks;
	403	fs->fs_nsect = lp->d_nsectors;
	404	fs->fs_spc = lp->d_secpercyl;
	405	fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
	406	fs->fs_sblkno = roundup(
	407	howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
	408	fs->fs_frag);
	409	fs->fs_cgmask = 0xffffffff;
	410	for (i = fs->fs_ntrak; i > 1; i >>= 1)
	411	fs->fs_cgmask <<= 1;
	412	if (!POWEROF2(fs->fs_ntrak))
	413	fs->fs_cgmask <<= 1;
	414	fs->fs_cgoffset = roundup(
	415	howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
	416	fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
	417	fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
	418	for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
	419	fs->fs_fsbtodb++;
55f8bbd7	420	dev_bsize = lp->d_secsize;
c7aed003 KM	421	return (1);
	422	}
	423
c7aed003 KM	424	struct disklabel *
	425	getdisklabel(s, fd)
	426	char *s;
	427	int fd;
	428	{
	429	static struct disklabel lab;
	430
	431	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
919c85da MK	432	if (s == NULL)
919c85da MK	433	return ((struct disklabel *)NULL);
cfbff64d	434	pwarn("");
c7aed003	435	perror("ioctl (GDINFO)");
cfbff64d	436	errexit("%s: can't read disk label", s);
c7aed003 KM	437	}
	438	return (&lab);
	439	}