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setup.c revision 1.14
      1   1.1      cgd /*
      2  1.10  mycroft  * Copyright (c) 1980, 1986, 1993
      3  1.10  mycroft  *	The Regents of the University of California.  All rights reserved.
      4   1.1      cgd  *
      5   1.1      cgd  * Redistribution and use in source and binary forms, with or without
      6   1.1      cgd  * modification, are permitted provided that the following conditions
      7   1.1      cgd  * are met:
      8   1.1      cgd  * 1. Redistributions of source code must retain the above copyright
      9   1.1      cgd  *    notice, this list of conditions and the following disclaimer.
     10   1.1      cgd  * 2. Redistributions in binary form must reproduce the above copyright
     11   1.1      cgd  *    notice, this list of conditions and the following disclaimer in the
     12   1.1      cgd  *    documentation and/or other materials provided with the distribution.
     13   1.1      cgd  * 3. All advertising materials mentioning features or use of this software
     14   1.1      cgd  *    must display the following acknowledgement:
     15   1.1      cgd  *	This product includes software developed by the University of
     16   1.1      cgd  *	California, Berkeley and its contributors.
     17   1.1      cgd  * 4. Neither the name of the University nor the names of its contributors
     18   1.1      cgd  *    may be used to endorse or promote products derived from this software
     19   1.1      cgd  *    without specific prior written permission.
     20   1.1      cgd  *
     21   1.1      cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22   1.1      cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23   1.1      cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24   1.1      cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25   1.1      cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26   1.1      cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27   1.1      cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28   1.1      cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29   1.1      cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30   1.1      cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31   1.1      cgd  * SUCH DAMAGE.
     32   1.1      cgd  */
     33   1.1      cgd 
     34   1.1      cgd #ifndef lint
     35  1.10  mycroft /*static char sccsid[] = "from: @(#)setup.c	8.2 (Berkeley) 2/21/94";*/
     36  1.14  mycroft static char *rcsid = "$Id: setup.c,v 1.14 1994/10/28 16:55:11 mycroft Exp $";
     37   1.1      cgd #endif /* not lint */
     38   1.1      cgd 
     39   1.1      cgd #define DKTYPENAMES
     40   1.1      cgd #include <sys/param.h>
     41   1.8      cgd #include <sys/time.h>
     42  1.10  mycroft #include <ufs/ufs/dinode.h>
     43  1.10  mycroft #include <ufs/ffs/fs.h>
     44   1.1      cgd #include <sys/stat.h>
     45   1.1      cgd #include <sys/ioctl.h>
     46   1.1      cgd #include <sys/disklabel.h>
     47   1.1      cgd #include <sys/file.h>
     48   1.1      cgd #include <errno.h>
     49   1.1      cgd #include <stdlib.h>
     50   1.1      cgd #include <string.h>
     51   1.1      cgd #include <ctype.h>
     52   1.1      cgd #include "fsck.h"
     53   1.1      cgd 
     54   1.1      cgd struct bufarea asblk;
     55   1.1      cgd #define altsblock (*asblk.b_un.b_fs)
     56   1.1      cgd #define POWEROF2(num)	(((num) & ((num) - 1)) == 0)
     57   1.1      cgd 
     58   1.1      cgd struct	disklabel *getdisklabel();
     59   1.1      cgd 
     60   1.1      cgd setup(dev)
     61   1.1      cgd 	char *dev;
     62   1.1      cgd {
     63   1.1      cgd 	long cg, size, asked, i, j;
     64   1.1      cgd 	long bmapsize;
     65   1.1      cgd 	struct disklabel *lp;
     66  1.10  mycroft 	off_t sizepb;
     67  1.10  mycroft 	struct stat statb;
     68   1.1      cgd 	struct fs proto;
     69   1.1      cgd 
     70   1.1      cgd 	havesb = 0;
     71  1.10  mycroft 	fswritefd = -1;
     72   1.1      cgd 	if (stat(dev, &statb) < 0) {
     73   1.1      cgd 		printf("Can't stat %s: %s\n", dev, strerror(errno));
     74   1.1      cgd 		return (0);
     75   1.1      cgd 	}
     76  1.14  mycroft 	if (!S_ISCHR(statb.st_mode)) {
     77   1.1      cgd 		pfatal("%s is not a character device", dev);
     78   1.1      cgd 		if (reply("CONTINUE") == 0)
     79   1.1      cgd 			return (0);
     80   1.1      cgd 	}
     81   1.1      cgd 	if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
     82   1.1      cgd 		printf("Can't open %s: %s\n", dev, strerror(errno));
     83   1.1      cgd 		return (0);
     84   1.1      cgd 	}
     85   1.1      cgd 	if (preen == 0)
     86   1.1      cgd 		printf("** %s", dev);
     87   1.1      cgd 	if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
     88   1.1      cgd 		fswritefd = -1;
     89   1.1      cgd 		if (preen)
     90   1.1      cgd 			pfatal("NO WRITE ACCESS");
     91   1.1      cgd 		printf(" (NO WRITE)");
     92   1.1      cgd 	}
     93   1.1      cgd 	if (preen == 0)
     94   1.1      cgd 		printf("\n");
     95   1.1      cgd 	fsmodified = 0;
     96   1.1      cgd 	lfdir = 0;
     97   1.1      cgd 	initbarea(&sblk);
     98   1.1      cgd 	initbarea(&asblk);
     99   1.1      cgd 	sblk.b_un.b_buf = malloc(SBSIZE);
    100   1.1      cgd 	asblk.b_un.b_buf = malloc(SBSIZE);
    101   1.1      cgd 	if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
    102   1.1      cgd 		errexit("cannot allocate space for superblock\n");
    103   1.1      cgd 	if (lp = getdisklabel((char *)NULL, fsreadfd))
    104   1.1      cgd 		dev_bsize = secsize = lp->d_secsize;
    105   1.1      cgd 	else
    106   1.1      cgd 		dev_bsize = secsize = DEV_BSIZE;
    107   1.1      cgd 	/*
    108   1.1      cgd 	 * Read in the superblock, looking for alternates if necessary
    109   1.1      cgd 	 */
    110   1.1      cgd 	if (readsb(1) == 0) {
    111   1.1      cgd 		if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
    112   1.1      cgd 			return(0);
    113   1.1      cgd 		if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
    114   1.1      cgd 			return (0);
    115   1.1      cgd 		for (cg = 0; cg < proto.fs_ncg; cg++) {
    116   1.1      cgd 			bflag = fsbtodb(&proto, cgsblock(&proto, cg));
    117   1.1      cgd 			if (readsb(0) != 0)
    118   1.1      cgd 				break;
    119   1.1      cgd 		}
    120   1.1      cgd 		if (cg >= proto.fs_ncg) {
    121   1.1      cgd 			printf("%s %s\n%s %s\n%s %s\n",
    122   1.1      cgd 				"SEARCH FOR ALTERNATE SUPER-BLOCK",
    123   1.1      cgd 				"FAILED. YOU MUST USE THE",
    124   1.1      cgd 				"-b OPTION TO FSCK TO SPECIFY THE",
    125   1.1      cgd 				"LOCATION OF AN ALTERNATE",
    126   1.1      cgd 				"SUPER-BLOCK TO SUPPLY NEEDED",
    127   1.1      cgd 				"INFORMATION; SEE fsck(8).");
    128   1.1      cgd 			return(0);
    129   1.1      cgd 		}
    130   1.1      cgd 		pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
    131   1.1      cgd 	}
    132   1.1      cgd 	maxfsblock = sblock.fs_size;
    133   1.1      cgd 	maxino = sblock.fs_ncg * sblock.fs_ipg;
    134   1.1      cgd 	/*
    135   1.1      cgd 	 * Check and potentially fix certain fields in the super block.
    136   1.1      cgd 	 */
    137   1.1      cgd 	if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
    138   1.1      cgd 		pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
    139   1.1      cgd 		if (reply("SET TO DEFAULT") == 1) {
    140   1.1      cgd 			sblock.fs_optim = FS_OPTTIME;
    141   1.1      cgd 			sbdirty();
    142   1.1      cgd 		}
    143   1.1      cgd 	}
    144   1.1      cgd 	if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
    145   1.1      cgd 		pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
    146   1.1      cgd 			sblock.fs_minfree);
    147   1.1      cgd 		if (reply("SET TO DEFAULT") == 1) {
    148   1.1      cgd 			sblock.fs_minfree = 10;
    149   1.1      cgd 			sbdirty();
    150   1.1      cgd 		}
    151   1.1      cgd 	}
    152   1.1      cgd 	if (sblock.fs_interleave < 1 ||
    153   1.1      cgd 	    sblock.fs_interleave > sblock.fs_nsect) {
    154   1.1      cgd 		pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
    155   1.1      cgd 			sblock.fs_interleave);
    156   1.1      cgd 		sblock.fs_interleave = 1;
    157   1.1      cgd 		if (preen)
    158   1.1      cgd 			printf(" (FIXED)\n");
    159   1.1      cgd 		if (preen || reply("SET TO DEFAULT") == 1) {
    160   1.1      cgd 			sbdirty();
    161   1.1      cgd 			dirty(&asblk);
    162   1.1      cgd 		}
    163   1.1      cgd 	}
    164   1.1      cgd 	if (sblock.fs_npsect < sblock.fs_nsect ||
    165   1.1      cgd 	    sblock.fs_npsect > sblock.fs_nsect*2) {
    166   1.1      cgd 		pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
    167   1.1      cgd 			sblock.fs_npsect);
    168   1.1      cgd 		sblock.fs_npsect = sblock.fs_nsect;
    169   1.1      cgd 		if (preen)
    170   1.1      cgd 			printf(" (FIXED)\n");
    171   1.1      cgd 		if (preen || reply("SET TO DEFAULT") == 1) {
    172   1.1      cgd 			sbdirty();
    173   1.1      cgd 			dirty(&asblk);
    174   1.1      cgd 		}
    175   1.1      cgd 	}
    176  1.10  mycroft 	if (sblock.fs_inodefmt >= FS_44INODEFMT) {
    177  1.10  mycroft 		newinofmt = 1;
    178  1.10  mycroft 	} else {
    179  1.10  mycroft 		sblock.fs_qbmask = ~sblock.fs_bmask;
    180  1.10  mycroft 		sblock.fs_qfmask = ~sblock.fs_fmask;
    181  1.10  mycroft 		newinofmt = 0;
    182  1.10  mycroft 	}
    183  1.10  mycroft 	/*
    184  1.10  mycroft 	 * Convert to new inode format.
    185  1.10  mycroft 	 */
    186  1.10  mycroft 	if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
    187  1.10  mycroft 		if (preen)
    188  1.10  mycroft 			pwarn("CONVERTING TO NEW INODE FORMAT\n");
    189  1.10  mycroft 		else if (!reply("CONVERT TO NEW INODE FORMAT"))
    190  1.10  mycroft 			return(0);
    191  1.10  mycroft 		doinglevel2++;
    192  1.10  mycroft 		sblock.fs_inodefmt = FS_44INODEFMT;
    193  1.10  mycroft 		sizepb = sblock.fs_bsize;
    194  1.10  mycroft 		sblock.fs_maxfilesize = sblock.fs_bsize * NDADDR - 1;
    195  1.10  mycroft 		for (i = 0; i < NIADDR; i++) {
    196  1.10  mycroft 			sizepb *= NINDIR(&sblock);
    197  1.10  mycroft 			sblock.fs_maxfilesize += sizepb;
    198   1.1      cgd 		}
    199  1.10  mycroft 		sblock.fs_maxsymlinklen = MAXSYMLINKLEN;
    200  1.10  mycroft 		sblock.fs_qbmask = ~sblock.fs_bmask;
    201  1.10  mycroft 		sblock.fs_qfmask = ~sblock.fs_fmask;
    202  1.10  mycroft 		sbdirty();
    203  1.10  mycroft 		dirty(&asblk);
    204  1.10  mycroft 	}
    205  1.10  mycroft 	/*
    206  1.10  mycroft 	 * Convert to new cylinder group format.
    207  1.10  mycroft 	 */
    208  1.10  mycroft 	if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
    209  1.10  mycroft 		if (preen)
    210  1.10  mycroft 			pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
    211  1.10  mycroft 		else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
    212  1.10  mycroft 			return(0);
    213  1.10  mycroft 		doinglevel1++;
    214  1.10  mycroft 		sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
    215  1.10  mycroft 		sblock.fs_nrpos = 8;
    216  1.10  mycroft 		sblock.fs_postbloff =
    217  1.10  mycroft 		    (char *)(&sblock.fs_opostbl[0][0]) -
    218  1.14  mycroft 		    (char *)(&sblock.fs_unused_1);
    219  1.10  mycroft 		sblock.fs_rotbloff = &sblock.fs_space[0] -
    220  1.14  mycroft 		    (u_char *)(&sblock.fs_unused_1);
    221  1.10  mycroft 		sblock.fs_cgsize =
    222  1.10  mycroft 			fragroundup(&sblock, CGSIZE(&sblock));
    223  1.10  mycroft 		sbdirty();
    224  1.10  mycroft 		dirty(&asblk);
    225   1.1      cgd 	}
    226  1.11       ws 	if (asblk.b_dirty && !bflag) {
    227  1.12  mycroft 		memcpy(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
    228   1.1      cgd 		flush(fswritefd, &asblk);
    229   1.1      cgd 	}
    230   1.1      cgd 	/*
    231   1.1      cgd 	 * read in the summary info.
    232   1.1      cgd 	 */
    233   1.1      cgd 	asked = 0;
    234   1.1      cgd 	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
    235   1.1      cgd 		size = sblock.fs_cssize - i < sblock.fs_bsize ?
    236   1.1      cgd 		    sblock.fs_cssize - i : sblock.fs_bsize;
    237   1.1      cgd 		sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
    238   1.1      cgd 		if (bread(fsreadfd, (char *)sblock.fs_csp[j],
    239   1.1      cgd 		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
    240   1.1      cgd 		    size) != 0 && !asked) {
    241   1.1      cgd 			pfatal("BAD SUMMARY INFORMATION");
    242   1.1      cgd 			if (reply("CONTINUE") == 0)
    243   1.1      cgd 				errexit("");
    244   1.1      cgd 			asked++;
    245   1.1      cgd 		}
    246   1.1      cgd 	}
    247   1.1      cgd 	/*
    248   1.1      cgd 	 * allocate and initialize the necessary maps
    249   1.1      cgd 	 */
    250   1.1      cgd 	bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
    251   1.1      cgd 	blockmap = calloc((unsigned)bmapsize, sizeof (char));
    252   1.1      cgd 	if (blockmap == NULL) {
    253   1.1      cgd 		printf("cannot alloc %u bytes for blockmap\n",
    254   1.1      cgd 		    (unsigned)bmapsize);
    255   1.1      cgd 		goto badsb;
    256   1.1      cgd 	}
    257   1.1      cgd 	statemap = calloc((unsigned)(maxino + 1), sizeof(char));
    258   1.1      cgd 	if (statemap == NULL) {
    259   1.1      cgd 		printf("cannot alloc %u bytes for statemap\n",
    260   1.1      cgd 		    (unsigned)(maxino + 1));
    261   1.1      cgd 		goto badsb;
    262   1.1      cgd 	}
    263  1.10  mycroft 	typemap = calloc((unsigned)(maxino + 1), sizeof(char));
    264  1.10  mycroft 	if (typemap == NULL) {
    265  1.10  mycroft 		printf("cannot alloc %u bytes for typemap\n",
    266  1.10  mycroft 		    (unsigned)(maxino + 1));
    267  1.10  mycroft 		goto badsb;
    268  1.10  mycroft 	}
    269   1.1      cgd 	lncntp = (short *)calloc((unsigned)(maxino + 1), sizeof(short));
    270   1.1      cgd 	if (lncntp == NULL) {
    271   1.1      cgd 		printf("cannot alloc %u bytes for lncntp\n",
    272   1.1      cgd 		    (unsigned)(maxino + 1) * sizeof(short));
    273   1.1      cgd 		goto badsb;
    274   1.1      cgd 	}
    275   1.1      cgd 	numdirs = sblock.fs_cstotal.cs_ndir;
    276   1.1      cgd 	inplast = 0;
    277   1.1      cgd 	listmax = numdirs + 10;
    278   1.1      cgd 	inpsort = (struct inoinfo **)calloc((unsigned)listmax,
    279   1.1      cgd 	    sizeof(struct inoinfo *));
    280   1.1      cgd 	inphead = (struct inoinfo **)calloc((unsigned)numdirs,
    281   1.1      cgd 	    sizeof(struct inoinfo *));
    282   1.1      cgd 	if (inpsort == NULL || inphead == NULL) {
    283   1.1      cgd 		printf("cannot alloc %u bytes for inphead\n",
    284   1.1      cgd 		    (unsigned)numdirs * sizeof(struct inoinfo *));
    285   1.1      cgd 		goto badsb;
    286   1.1      cgd 	}
    287   1.1      cgd 	bufinit();
    288   1.1      cgd 	return (1);
    289   1.1      cgd 
    290   1.1      cgd badsb:
    291   1.1      cgd 	ckfini();
    292   1.1      cgd 	return (0);
    293   1.1      cgd }
    294   1.1      cgd 
    295   1.1      cgd /*
    296   1.1      cgd  * Read in the super block and its summary info.
    297   1.1      cgd  */
    298   1.1      cgd readsb(listerr)
    299   1.1      cgd 	int listerr;
    300   1.1      cgd {
    301   1.1      cgd 	daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
    302   1.1      cgd 
    303   1.1      cgd 	if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
    304   1.1      cgd 		return (0);
    305   1.1      cgd 	sblk.b_bno = super;
    306   1.1      cgd 	sblk.b_size = SBSIZE;
    307   1.1      cgd 	/*
    308   1.1      cgd 	 * run a few consistency checks of the super block
    309   1.1      cgd 	 */
    310   1.1      cgd 	if (sblock.fs_magic != FS_MAGIC)
    311   1.1      cgd 		{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
    312   1.1      cgd 	if (sblock.fs_ncg < 1)
    313   1.1      cgd 		{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
    314   1.1      cgd 	if (sblock.fs_cpg < 1)
    315   1.1      cgd 		{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
    316   1.1      cgd 	if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
    317   1.1      cgd 	    (sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl)
    318   1.1      cgd 		{ badsb(listerr, "NCYL LESS THAN NCG*CPG"); return (0); }
    319   1.1      cgd 	if (sblock.fs_sbsize > SBSIZE)
    320   1.1      cgd 		{ badsb(listerr, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
    321   1.1      cgd 	/*
    322   1.1      cgd 	 * Compute block size that the filesystem is based on,
    323   1.1      cgd 	 * according to fsbtodb, and adjust superblock block number
    324   1.1      cgd 	 * so we can tell if this is an alternate later.
    325   1.1      cgd 	 */
    326   1.1      cgd 	super *= dev_bsize;
    327   1.1      cgd 	dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
    328   1.1      cgd 	sblk.b_bno = super / dev_bsize;
    329  1.10  mycroft 	if (bflag) {
    330  1.10  mycroft 		havesb = 1;
    331  1.10  mycroft 		return (1);
    332  1.10  mycroft 	}
    333   1.1      cgd 	/*
    334   1.1      cgd 	 * Set all possible fields that could differ, then do check
    335   1.1      cgd 	 * of whole super block against an alternate super block.
    336   1.1      cgd 	 * When an alternate super-block is specified this check is skipped.
    337   1.1      cgd 	 */
    338   1.1      cgd 	getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
    339   1.1      cgd 	if (asblk.b_errs)
    340   1.1      cgd 		return (0);
    341  1.14  mycroft 	altsblock.fs_unused_1 = sblock.fs_unused_1;
    342  1.14  mycroft 	altsblock.fs_unused_2 = sblock.fs_unused_2;
    343   1.1      cgd 	altsblock.fs_time = sblock.fs_time;
    344   1.1      cgd 	altsblock.fs_cstotal = sblock.fs_cstotal;
    345   1.1      cgd 	altsblock.fs_cgrotor = sblock.fs_cgrotor;
    346   1.1      cgd 	altsblock.fs_fmod = sblock.fs_fmod;
    347   1.1      cgd 	altsblock.fs_clean = sblock.fs_clean;
    348   1.1      cgd 	altsblock.fs_ronly = sblock.fs_ronly;
    349   1.1      cgd 	altsblock.fs_flags = sblock.fs_flags;
    350   1.1      cgd 	altsblock.fs_maxcontig = sblock.fs_maxcontig;
    351   1.1      cgd 	altsblock.fs_minfree = sblock.fs_minfree;
    352   1.1      cgd 	altsblock.fs_optim = sblock.fs_optim;
    353   1.1      cgd 	altsblock.fs_rotdelay = sblock.fs_rotdelay;
    354   1.1      cgd 	altsblock.fs_maxbpg = sblock.fs_maxbpg;
    355  1.12  mycroft 	memcpy(altsblock.fs_csp, sblock.fs_csp,
    356   1.1      cgd 		sizeof sblock.fs_csp);
    357  1.12  mycroft 	memcpy(altsblock.fs_fsmnt, sblock.fs_fsmnt,
    358   1.1      cgd 		sizeof sblock.fs_fsmnt);
    359  1.12  mycroft 	memcpy(altsblock.fs_sparecon, sblock.fs_sparecon,
    360   1.1      cgd 		sizeof sblock.fs_sparecon);
    361   1.1      cgd 	/*
    362   1.1      cgd 	 * The following should not have to be copied.
    363   1.1      cgd 	 */
    364   1.1      cgd 	altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
    365   1.1      cgd 	altsblock.fs_interleave = sblock.fs_interleave;
    366   1.1      cgd 	altsblock.fs_npsect = sblock.fs_npsect;
    367   1.1      cgd 	altsblock.fs_nrpos = sblock.fs_nrpos;
    368  1.10  mycroft 	altsblock.fs_qbmask = sblock.fs_qbmask;
    369  1.10  mycroft 	altsblock.fs_qfmask = sblock.fs_qfmask;
    370  1.10  mycroft 	altsblock.fs_state = sblock.fs_state;
    371  1.10  mycroft 	altsblock.fs_maxfilesize = sblock.fs_maxfilesize;
    372  1.13  mycroft 	if (memcmp(&sblock, &altsblock, (int)sblock.fs_sbsize)) {
    373   1.1      cgd 		badsb(listerr,
    374   1.1      cgd 		"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
    375   1.1      cgd 		return (0);
    376   1.1      cgd 	}
    377   1.1      cgd 	havesb = 1;
    378   1.1      cgd 	return (1);
    379   1.1      cgd }
    380   1.1      cgd 
    381   1.1      cgd badsb(listerr, s)
    382   1.1      cgd 	int listerr;
    383   1.1      cgd 	char *s;
    384   1.1      cgd {
    385   1.1      cgd 
    386   1.1      cgd 	if (!listerr)
    387   1.1      cgd 		return;
    388   1.1      cgd 	if (preen)
    389  1.10  mycroft 		printf("%s: ", cdevname);
    390   1.1      cgd 	pfatal("BAD SUPER BLOCK: %s\n", s);
    391   1.1      cgd }
    392   1.1      cgd 
    393   1.1      cgd /*
    394   1.1      cgd  * Calculate a prototype superblock based on information in the disk label.
    395   1.1      cgd  * When done the cgsblock macro can be calculated and the fs_ncg field
    396   1.1      cgd  * can be used. Do NOT attempt to use other macros without verifying that
    397   1.1      cgd  * their needed information is available!
    398   1.1      cgd  */
    399   1.1      cgd calcsb(dev, devfd, fs)
    400   1.1      cgd 	char *dev;
    401   1.1      cgd 	int devfd;
    402   1.1      cgd 	register struct fs *fs;
    403   1.1      cgd {
    404   1.1      cgd 	register struct disklabel *lp;
    405   1.1      cgd 	register struct partition *pp;
    406   1.1      cgd 	register char *cp;
    407   1.1      cgd 	int i;
    408   1.1      cgd 
    409  1.12  mycroft 	cp = strchr(dev, '\0') - 1;
    410   1.1      cgd 	if (cp == (char *)-1 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp)) {
    411   1.1      cgd 		pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
    412   1.1      cgd 		return (0);
    413   1.1      cgd 	}
    414   1.1      cgd 	lp = getdisklabel(dev, devfd);
    415   1.1      cgd 	if (isdigit(*cp))
    416   1.1      cgd 		pp = &lp->d_partitions[0];
    417   1.1      cgd 	else
    418   1.1      cgd 		pp = &lp->d_partitions[*cp - 'a'];
    419   1.1      cgd 	if (pp->p_fstype != FS_BSDFFS) {
    420   1.1      cgd 		pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
    421   1.1      cgd 			dev, pp->p_fstype < FSMAXTYPES ?
    422   1.1      cgd 			fstypenames[pp->p_fstype] : "unknown");
    423   1.1      cgd 		return (0);
    424   1.1      cgd 	}
    425  1.12  mycroft 	memset(fs, 0, sizeof(struct fs));
    426   1.1      cgd 	fs->fs_fsize = pp->p_fsize;
    427   1.1      cgd 	fs->fs_frag = pp->p_frag;
    428   1.1      cgd 	fs->fs_cpg = pp->p_cpg;
    429   1.1      cgd 	fs->fs_size = pp->p_size;
    430   1.1      cgd 	fs->fs_ntrak = lp->d_ntracks;
    431   1.1      cgd 	fs->fs_nsect = lp->d_nsectors;
    432   1.1      cgd 	fs->fs_spc = lp->d_secpercyl;
    433   1.1      cgd 	fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
    434   1.1      cgd 	fs->fs_sblkno = roundup(
    435   1.1      cgd 		howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
    436   1.1      cgd 		fs->fs_frag);
    437   1.1      cgd 	fs->fs_cgmask = 0xffffffff;
    438   1.1      cgd 	for (i = fs->fs_ntrak; i > 1; i >>= 1)
    439   1.1      cgd 		fs->fs_cgmask <<= 1;
    440   1.1      cgd 	if (!POWEROF2(fs->fs_ntrak))
    441   1.1      cgd 		fs->fs_cgmask <<= 1;
    442   1.1      cgd 	fs->fs_cgoffset = roundup(
    443   1.1      cgd 		howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
    444   1.1      cgd 	fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
    445   1.1      cgd 	fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
    446   1.1      cgd 	for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
    447   1.1      cgd 		fs->fs_fsbtodb++;
    448   1.1      cgd 	dev_bsize = lp->d_secsize;
    449   1.1      cgd 	return (1);
    450   1.1      cgd }
    451   1.1      cgd 
    452   1.1      cgd struct disklabel *
    453   1.1      cgd getdisklabel(s, fd)
    454   1.1      cgd 	char *s;
    455   1.1      cgd 	int	fd;
    456   1.1      cgd {
    457   1.1      cgd 	static struct disklabel lab;
    458   1.1      cgd 
    459   1.1      cgd 	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
    460   1.1      cgd 		if (s == NULL)
    461   1.1      cgd 			return ((struct disklabel *)NULL);
    462   1.1      cgd 		pwarn("ioctl (GCINFO): %s\n", strerror(errno));
    463   1.1      cgd 		errexit("%s: can't read disk label\n", s);
    464   1.1      cgd 	}
    465   1.1      cgd 	return (&lab);
    466   1.1      cgd }
    467