[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	5.22 (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	*malloc(), *calloc();
char	*index();
struct	disklabel *getdisklabel();

setup(dev)
	char *dev;
{
	dev_t rootdev;
	long cg, ncg, size, asked, i, j;
	struct disklabel *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 = malloc(SBSIZE);
	asblk.b_un.b_buf = malloc(SBSIZE);
	if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
		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)
		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;

	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
d35d4c2b	8	static char sccsid[] = "@(#)setup.c 5.22 (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
d35d4c2b	42	char malloc(), calloc();
c7aed003	43	char *index();
d35d4c2b	44	struct disklabel *getdisklabel();
eb93b62a KM	45
	46	setup(dev)
	47	char *dev;
	48	{
	49	dev_t rootdev;
05d069d3	50	long cg, ncg, size, asked, i, j;
d35d4c2b	51	struct disklabel *lp;
eb93b62a	52	struct stat statb;
c7aed003	53	struct fs proto;
eb93b62a	54
55f8bbd7	55	havesb = 0;
eb93b62a KM	56	if (stat("/", &statb) < 0)
	57	errexit("Can't stat root\n");
	58	rootdev = statb.st_dev;
	59	if (stat(dev, &statb) < 0) {
cfbff64d	60	perror(dev);
7718c0e6	61	printf("Can't stat %s\n", dev);
eb93b62a KM	62	return (0);
	63	}
	64	rawflg = 0;
	65	if ((statb.st_mode & S_IFMT) == S_IFBLK)
	66	;
	67	else if ((statb.st_mode & S_IFMT) == S_IFCHR)
	68	rawflg++;
	69	else {
	70	if (reply("file is not a block or character device; OK") == 0)
	71	return (0);
	72	}
	73	if (rootdev == statb.st_rdev)
	74	hotroot++;
c7aed003	75	if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) {
cfbff64d	76	perror(dev);
7718c0e6	77	printf("Can't open %s\n", dev);
eb93b62a KM	78	return (0);
	79	}
	80	if (preen == 0)
	81	printf("** %s", dev);
c7aed003	82	if (nflag \|\| (dfile.wfdes = open(dev, O_WRONLY)) < 0) {
eb93b62a KM	83	dfile.wfdes = -1;
	84	if (preen)
	85	pfatal("NO WRITE ACCESS");
	86	printf(" (NO WRITE)");
	87	}
	88	if (preen == 0)
	89	printf("\n");
eb93b62a	90	dfile.mod = 0;
eb93b62a	91	lfdir = 0;
eb93b62a	92	initbarea(&sblk);
7beeecfc	93	initbarea(&asblk);
d35d4c2b KM	94	sblk.b_un.b_buf = malloc(SBSIZE);
	95	asblk.b_un.b_buf = malloc(SBSIZE);
	96	if (sblk.b_un.b_buf == NULL \|\| asblk.b_un.b_buf == NULL)
adc5a10c	97	errexit("cannot allocate space for superblock\n");
55f8bbd7 MK	98	if (lp = getdisklabel((char *)NULL, dfile.rfdes))
55f8bbd7 MK	99	dev_bsize = secsize = lp->d_secsize;
7beeecfc KM	100	else
7beeecfc KM	101	dev_bsize = secsize = DEV_BSIZE;
eb93b62a	102	/*
c7aed003	103	* Read in the superblock, looking for alternates if necessary
eb93b62a	104	*/
c7aed003	105	if (readsb(1) == 0) {
55f8bbd7	106	if (bflag \|\| preen \|\| calcsb(dev, dfile.rfdes, &proto) == 0)
c7aed003 KM	107	return(0);
	108	if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
	109	return (0);
	110	for (cg = 0; cg < proto.fs_ncg; cg++) {
	111	bflag = fsbtodb(&proto, cgsblock(&proto, cg));
	112	if (readsb(0) != 0)
	113	break;
	114	}
	115	if (cg >= proto.fs_ncg) {
	116	printf("%s %s\n%s %s\n%s %s\n",
	117	"SEARCH FOR ALTERNATE SUPER-BLOCK",
	118	"FAILED. YOU MUST USE THE",
	119	"-b OPTION TO FSCK TO SPECIFY THE",
	120	"LOCATION OF AN ALTERNATE",
	121	"SUPER-BLOCK TO SUPPLY NEEDED",
	122	"INFORMATION; SEE fsck(8).");
	123	return(0);
	124	}
	125	pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
	126	}
	127	fmax = sblock.fs_size;
	128	imax = sblock.fs_ncg * sblock.fs_ipg;
d9f38d60 KM	129	/*
	130	* Check and potentially fix certain fields in the super block.
	131	*/
	132	if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
	133	pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
	134	if (reply("SET TO DEFAULT") == 1) {
	135	sblock.fs_optim = FS_OPTTIME;
	136	sbdirty();
	137	}
	138	}
	139	if ((sblock.fs_minfree < 0 \|\| sblock.fs_minfree > 99)) {
	140	pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
	141	sblock.fs_minfree);
	142	if (reply("SET TO DEFAULT") == 1) {
	143	sblock.fs_minfree = 10;
	144	sbdirty();
	145	}
	146	}
d4af1a46	147	if (sblock.fs_interleave < 1) {
d4af1a46	148	sblock.fs_interleave);
43171015	149	sblock.fs_interleave = 1;
d4af1a46	150	sbdirty();
7beeecfc KM	151	dirty(&asblk);
7beeecfc KM	152	}
d4af1a46 KM	153	}
d4af1a46 KM	154	if (sblock.fs_npsect < sblock.fs_nsect) {
d4af1a46	155	sblock.fs_npsect);
43171015	156	sblock.fs_npsect = sblock.fs_nsect;
d4af1a46	157	sbdirty();
7beeecfc KM	158	dirty(&asblk);
	159	}
	160	}
a747b5d4 KM	161	if (cvtflag) {
	162	if (sblock.fs_postblformat == FS_42POSTBLFMT) {
	163	/*
	164	* Requested to convert from old format to new format
	165	*/
	166	if (preen)
	167	pwarn("CONVERTING TO NEW FILE SYSTEM FORMAT\n");
	168	else if (!reply("CONVERT TO NEW FILE SYSTEM FORMAT"))
	169	return(0);
7beeecfc KM	170	sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
	171	sblock.fs_nrpos = 8;
	172	sblock.fs_postbloff =
	173	(char *)(&sblock.fs_opostbl[0][0]) -
	174	(char *)(&sblock.fs_link);
	175	sblock.fs_rotbloff = &sblock.fs_space[0] -
	176	(u_char *)(&sblock.fs_link);
be894f48 KM	177	sblock.fs_cgsize =
be894f48 KM	178	fragroundup(&sblock, CGSIZE(&sblock));
7beeecfc KM	179	/*
	180	* Planning now for future expansion.
	181	*/
	182	# if (BYTE_ORDER == BIG_ENDIAN)
	183	sblock.fs_qbmask.val[0] = 0;
	184	sblock.fs_qbmask.val[1] = ~sblock.fs_bmask;
	185	sblock.fs_qfmask.val[0] = 0;
	186	sblock.fs_qfmask.val[1] = ~sblock.fs_fmask;
	187	# endif /* BIG_ENDIAN */
	188	# if (BYTE_ORDER == LITTLE_ENDIAN)
	189	sblock.fs_qbmask.val[0] = ~sblock.fs_bmask;
	190	sblock.fs_qbmask.val[1] = 0;
	191	sblock.fs_qfmask.val[0] = ~sblock.fs_fmask;
	192	sblock.fs_qfmask.val[1] = 0;
	193	# endif /* LITTLE_ENDIAN */
	194	sbdirty();
	195	dirty(&asblk);
a747b5d4 KM	196	} else if (sblock.fs_postblformat == FS_DYNAMICPOSTBLFMT) {
	197	/*
	198	* Requested to convert from new format to old format
	199	*/
	200	if (sblock.fs_nrpos != 8 \|\| sblock.fs_ipg > 2048 \|\|
	201	sblock.fs_cpg > 32 \|\| sblock.fs_cpc > 16) {
	202	printf(
	203	"PARAMETERS OF CURRENT FILE SYSTEM DO NOT\n\t");
	204	errexit(
	205	"ALLOW CONVERSION TO OLD FILE SYSTEM FORMAT\n");
	206	}
	207	if (preen)
	208	pwarn("CONVERTING TO OLD FILE SYSTEM FORMAT\n");
	209	else if (!reply("CONVERT TO OLD FILE SYSTEM FORMAT"))
	210	return(0);
	211	sblock.fs_postblformat = FS_42POSTBLFMT;
be894f48 KM	212	sblock.fs_cgsize = fragroundup(&sblock,
be894f48 KM	213	sizeof(struct ocg) + howmany(sblock.fs_fpg, NBBY));
a747b5d4 KM	214	sbdirty();
	215	dirty(&asblk);
	216	} else {
	217	errexit("UNKNOWN FILE SYSTEM FORMAT\n");
7beeecfc	218	}
7beeecfc KM	219	}
	220	if (asblk.b_dirty) {
	221	bcopy((char )&sblock, (char )&altsblock, sblock.fs_sbsize);
	222	flush(&dfile, &asblk);
d4af1a46	223	}
eb93b62a KM	224	/*
	225	* read in the summary info.
	226	*/
05d069d3	227	asked = 0;
eb93b62a KM	228	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
	229	size = sblock.fs_cssize - i < sblock.fs_bsize ?
	230	sblock.fs_cssize - i : sblock.fs_bsize;
	231	sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
	232	if (bread(&dfile, (char *)sblock.fs_csp[j],
	233	fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
05d069d3 KM	234	size) != 0 && !asked) {
	235	pfatal("BAD SUMMARY INFORMATION");
	236	if (reply("CONTINUE") == 0)
	237	errexit("");
	238	asked++;
	239	}
eb93b62a KM	240	}
	241	/*
	242	* allocate and initialize the necessary maps
	243	*/
	244	bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
	245	blockmap = calloc((unsigned)bmapsz, sizeof (char));
	246	if (blockmap == NULL) {
	247	printf("cannot alloc %d bytes for blockmap\n", bmapsz);
	248	goto badsb;
	249	}
eb93b62a KM	250	statemap = calloc((unsigned)(imax + 1), sizeof(char));
	251	if (statemap == NULL) {
	252	printf("cannot alloc %d bytes for statemap\n", imax + 1);
	253	goto badsb;
	254	}
	255	lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
	256	if (lncntp == NULL) {
	257	printf("cannot alloc %d bytes for lncntp\n",
	258	(imax + 1) * sizeof(short));
	259	goto badsb;
	260	}
eb93b62a	261
adc5a10c	262	bufinit();
eb93b62a KM	263	return (1);
	264
	265	badsb:
	266	ckfini();
	267	return (0);
c7aed003 KM	268	}
	269
	270	/*
	271	* Read in the super block and its summary info.
	272	*/
	273	readsb(listerr)
	274	int listerr;
	275	{
55f8bbd7 MK	276	off_t sboff;
55f8bbd7 MK	277	daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
c7aed003	278
c7aed003 KM	279	if (bread(&dfile, (char *)&sblock, super, (long)SBSIZE) != 0)
	280	return (0);
	281	sblk.b_bno = super;
	282	sblk.b_size = SBSIZE;
	283	/*
	284	* run a few consistency checks of the super block
	285	*/
	286	if (sblock.fs_magic != FS_MAGIC)
	287	{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
	288	if (sblock.fs_ncg < 1)
	289	{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
7beeecfc	290	if (sblock.fs_cpg < 1)
c7aed003 KM	291	{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
	292	if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl \|\|
	293	(sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
	294	{ badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
	295	if (sblock.fs_sbsize > SBSIZE)
	296	{ badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
55f8bbd7 MK	297	/*
	298	* Compute block size that the filesystem is based on,
	299	* according to fsbtodb, and adjust superblock block number
	300	* so we can tell if this is an alternate later.
	301	*/
55f8bbd7 MK	302	super *= dev_bsize;
	303	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
	304	sblk.b_bno = super / dev_bsize;
c7aed003 KM	305	/*
	306	* Set all possible fields that could differ, then do check
	307	* of whole super block against an alternate super block.
	308	* When an alternate super-block is specified this check is skipped.
	309	*/
7beeecfc	310	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
d35d4c2b	311	if (asblk.b_errs)
7beeecfc	312	return (0);
55f8bbd7 MK	313	if (bflag) {
55f8bbd7 MK	314	havesb = 1;
c7aed003	315	return (1);
55f8bbd7	316	}
c7aed003 KM	317	altsblock.fs_link = sblock.fs_link;
	318	altsblock.fs_rlink = sblock.fs_rlink;
	319	altsblock.fs_time = sblock.fs_time;
	320	altsblock.fs_cstotal = sblock.fs_cstotal;
	321	altsblock.fs_cgrotor = sblock.fs_cgrotor;
	322	altsblock.fs_fmod = sblock.fs_fmod;
	323	altsblock.fs_clean = sblock.fs_clean;
	324	altsblock.fs_ronly = sblock.fs_ronly;
	325	altsblock.fs_flags = sblock.fs_flags;
	326	altsblock.fs_maxcontig = sblock.fs_maxcontig;
	327	altsblock.fs_minfree = sblock.fs_minfree;
	328	altsblock.fs_optim = sblock.fs_optim;
	329	altsblock.fs_rotdelay = sblock.fs_rotdelay;
	330	altsblock.fs_maxbpg = sblock.fs_maxbpg;
	331	bcopy((char )sblock.fs_csp, (char )altsblock.fs_csp,
	332	sizeof sblock.fs_csp);
	333	bcopy((char )sblock.fs_fsmnt, (char )altsblock.fs_fsmnt,
	334	sizeof sblock.fs_fsmnt);
cfbff64d MK	335	bcopy((char )sblock.fs_sparecon, (char )altsblock.fs_sparecon,
cfbff64d MK	336	sizeof sblock.fs_sparecon);
7beeecfc KM	337	/*
	338	* The following should not have to be copied.
	339	*/
	340	altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
	341	altsblock.fs_interleave = sblock.fs_interleave;
	342	altsblock.fs_npsect = sblock.fs_npsect;
	343	altsblock.fs_nrpos = sblock.fs_nrpos;
cfbff64d MK	344	if (bcmp((char )&sblock, (char )&altsblock, (int)sblock.fs_sbsize)) {
	345	badsb(listerr,
	346	"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
	347	return (0);
	348	}
55f8bbd7	349	havesb = 1;
c7aed003	350	return (1);
eb93b62a KM	351	}
eb93b62a KM	352
c7aed003 KM	353	badsb(listerr, s)
c7aed003 KM	354	int listerr;
eb93b62a KM	355	char *s;
	356	{
	357
c7aed003 KM	358	if (!listerr)
c7aed003 KM	359	return;
eb93b62a KM	360	if (preen)
eb93b62a KM	361	printf("%s: ", devname);
c7aed003 KM	362	pfatal("BAD SUPER BLOCK: %s\n", s);
	363	}
	364
	365	/*
	366	* Calculate a prototype superblock based on information in the disk label.
	367	* When done the cgsblock macro can be calculated and the fs_ncg field
	368	* can be used. Do NOT attempt to use other macros without verifying that
	369	* their needed information is available!
	370	*/
	371	calcsb(dev, devfd, fs)
	372	char *dev;
	373	int devfd;
	374	register struct fs *fs;
	375	{
	376	register struct disklabel *lp;
	377	register struct partition *pp;
	378	register char *cp;
c7aed003 KM	379	int i;
	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	}