/*      $OpenBSD: setup.c,v 1.72 2025/09/17 16:07:57 deraadt Exp $      */
/*      $NetBSD: setup.c,v 1.27 1996/09/27 22:45:19 christos Exp $      */

/*
 * Copyright (c) 1980, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>  /* MAXBSIZE DEV_BSIZE roundup */
#define DKTYPENAMES
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <sys/disklabel.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <util.h>
#include <limits.h>
#include <ctype.h>
#include <err.h>

#include "fsck.h"
#include "extern.h"
#include "fsutil.h"

#define MAXIMUM(a, b)   (((a) > (b)) ? (a) : (b))

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

void badsb(int, char *);
int calcsb(char *, int, struct fs *, struct disklabel *, uint32_t);
static struct disklabel *getdisklabel(char *, int);
static int readsb(int);
static int cmpsb(struct fs *, struct fs *);
static char rdevname[PATH_MAX];

long numdirs, listmax, inplast;

/*
 * Possible locations for the superblock.
 */
static const int sbtry[] = SBLOCKSEARCH;
/* locations the 1st alternate sb can be at */
static const int altsbtry[] = { 32, 64, 128, 144, 160, 192, 256 };

int
setup(char *dev, int isfsdb)
{
        long size, asked, i, j;
        size_t bmapsize;
        struct disklabel *lp;
        off_t sizepb;
        struct stat statb;
        struct fs proto;
        int doskipclean;
        int32_t maxsymlinklen, nindir;
        uint32_t cg, inopb;
        u_int64_t maxfilesize;
        char *realdev;

        havesb = 0;
        fswritefd = fsreadfd = -1;
        doskipclean = skipclean;
        if ((fsreadfd = opendev(dev, O_RDONLY, 0, &realdev)) == -1) {
                printf("Can't open %s: %s\n", dev, strerror(errno));
                return (0);
        }
        if (strncmp(dev, realdev, PATH_MAX) != 0) {
                blockcheck(unrawname(realdev));
                strlcpy(rdevname, realdev, sizeof(rdevname));
                setcdevname(rdevname, dev, preen);

                if (isfsdb || !hotroot()) {
                        if (unveil("/dev", "rw") == -1)
                                err(1, "unveil /dev");
                        if (pledge("stdio rpath wpath getpw tty disklabel",
                            NULL) == -1)
                                err(1, "pledge");
                }
        }

        if (fstat(fsreadfd, &statb) == -1) {
                printf("Can't stat %s: %s\n", realdev, strerror(errno));
                close(fsreadfd);
                return (0);
        }
        if (!S_ISCHR(statb.st_mode)) {
                pfatal("%s is not a character device", realdev);
                if (reply("CONTINUE") == 0) {
                        close(fsreadfd);
                        return (0);
                }
        }
        if (preen == 0) {
                printf("** %s", realdev);
                if (strncmp(dev, realdev, PATH_MAX) != 0)
                        printf(" (%s)", dev);
        }
        if (nflag || (fswritefd = opendev(dev, O_WRONLY, 0, NULL)) == -1) {
                fswritefd = -1;
                if (preen)
                        pfatal("NO WRITE ACCESS");
                printf(" (NO WRITE)");
        }
        if (preen == 0)
                printf("\n");
        fsmodified = 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(NULL, fsreadfd)) != NULL)
                secsize = lp->d_secsize;
        else
                secsize = DEV_BSIZE;

        if (isfsdb) {
                if (pledge("stdio rpath getpw tty", NULL) == -1)
                        err(1, "pledge");
        } else if (!hotroot()) {
#ifndef SMALL
                if (pledge("stdio getpw", NULL) == -1)
                        err(1, "pledge");
#else
                if (pledge("stdio", NULL) == -1)
                        err(1, "pledge");
#endif
        }

        /*
         * Read in the superblock, looking for alternates if necessary
         */
        if (readsb(1) == 0) {
                if (bflag || preen ||
                    calcsb(realdev, fsreadfd, &proto, lp, SBLOCK_UFS1) == 0)
                        return(0);
                if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
                        return (0);
                for (i = 0; i < sizeof(altsbtry) / sizeof(altsbtry[0]); i++) {
                        bflag = altsbtry[i];
                        /* proto partially setup by calcsb */
                        if (readsb(0) != 0 &&
                            proto.fs_fsize == sblock.fs_fsize &&
                            proto.fs_bsize == sblock.fs_bsize)
                                goto found;
                }
                for (cg = 0; cg < proto.fs_ncg; cg++) {
                        bflag = fsbtodb(&proto, cgsblock(&proto, cg));
                        if (readsb(0) != 0 &&
                            proto.fs_fsize == sblock.fs_fsize &&
                            proto.fs_bsize == sblock.fs_bsize)
                                goto found;
                }
                calcsb(realdev, fsreadfd, &proto, lp, SBLOCK_UFS2);
                for (cg = 0; cg < proto.fs_ncg; cg++) {
                        bflag = fsbtodb(&proto, cgsblock(&proto, cg));
                        if (readsb(0) != 0 &&
                            proto.fs_fsize == sblock.fs_fsize &&
                            proto.fs_bsize == sblock.fs_bsize)
                                goto found;
                }
                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_FFS TO SPECIFY THE",
                            "LOCATION OF AN ALTERNATE",
                            "SUPER-BLOCK TO SUPPLY NEEDED",
                            "INFORMATION; SEE fsck_ffs(8).");
                        return(0);
                }
found:
                doskipclean = 0;
                pwarn("USING ALTERNATE SUPERBLOCK AT %lld\n", (long long)bflag);
        }
        if (debug)
                printf("clean = %d\n", sblock.fs_clean);
        if (sblock.fs_clean & FS_ISCLEAN) {
                if (doskipclean) {
                        pwarn("%sile system is clean; not checking\n",
                            preen ? "f" : "** F");
                        return (-1);
                }
                if (!preen)
                        pwarn("** File system is already clean\n");
        }
        maxfsblock = sblock.fs_size;
        maxino = sblock.fs_ncg * sblock.fs_ipg;
        sizepb = sblock.fs_bsize;
        maxfilesize = sblock.fs_bsize * NDADDR - 1;
        for (i = 0; i < NIADDR; i++) {
                sizepb *= NINDIR(&sblock);
                maxfilesize += sizepb;
        }
        /*
         * 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_npsect < sblock.fs_nsect ||
            sblock.fs_npsect > sblock.fs_nsect*2) {
                pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
                    sblock.fs_npsect);
                sblock.fs_npsect = sblock.fs_nsect;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("SET TO DEFAULT") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_bmask != ~(sblock.fs_bsize - 1)) {
                pwarn("INCORRECT BMASK=%x IN SUPERBLOCK",
                    sblock.fs_bmask);
                sblock.fs_bmask = ~(sblock.fs_bsize - 1);
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_fmask != ~(sblock.fs_fsize - 1)) {
                pwarn("INCORRECT FMASK=%x IN SUPERBLOCK",
                    sblock.fs_fmask);
                sblock.fs_fmask = ~(sblock.fs_fsize - 1);
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (1 << sblock.fs_bshift != sblock.fs_bsize) {
                pwarn("INCORRECT BSHIFT=%d IN SUPERBLOCK", sblock.fs_bshift);
                sblock.fs_bshift = ffs(sblock.fs_bsize) - 1;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (1 << sblock.fs_fshift != sblock.fs_fsize) {
                pwarn("INCORRECT FSHIFT=%d IN SUPERBLOCK", sblock.fs_fshift);
                sblock.fs_fshift = ffs(sblock.fs_fsize) - 1;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_inodefmt < FS_44INODEFMT) {
                pwarn("Format of filesystem is too old.\n");
                pwarn("Must update to modern format using a version of fsck\n");
                pfatal("from before release 5.0 with the command ``fsck -c 2''\n");
                exit(8);
        }
        if (sblock.fs_maxfilesize != maxfilesize) {
                pwarn("INCORRECT MAXFILESIZE=%llu IN SUPERBLOCK",
                    (unsigned long long)sblock.fs_maxfilesize);
                sblock.fs_maxfilesize = maxfilesize;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        maxsymlinklen = sblock.fs_magic == FS_UFS1_MAGIC ?
            MAXSYMLINKLEN_UFS1 : MAXSYMLINKLEN_UFS2;
        if (sblock.fs_maxsymlinklen != maxsymlinklen) {
                pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK",
                    sblock.fs_maxsymlinklen);
                sblock.fs_maxsymlinklen = maxsymlinklen;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_qbmask != ~sblock.fs_bmask) {
                pwarn("INCORRECT QBMASK=%lx IN SUPERBLOCK",
                    (unsigned long)sblock.fs_qbmask);
                sblock.fs_qbmask = ~sblock.fs_bmask;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_qfmask != ~sblock.fs_fmask) {
                pwarn("INCORRECT QFMASK=%lx IN SUPERBLOCK",
                    (unsigned long)sblock.fs_qfmask);
                sblock.fs_qfmask = ~sblock.fs_fmask;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_cgsize != fragroundup(&sblock, CGSIZE(&sblock))) {
                pwarn("INCONSISTENT CGSIZE=%d\n", sblock.fs_cgsize);
                sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_magic == FS_UFS2_MAGIC)
                inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
        else
                inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
        if (INOPB(&sblock) != inopb) {
                pwarn("INCONSISTENT INOPB=%u\n", INOPB(&sblock));
                sblock.fs_inopb = inopb;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.fs_magic == FS_UFS2_MAGIC)
                nindir = sblock.fs_bsize / sizeof(int64_t);
        else
                nindir = sblock.fs_bsize / sizeof(int32_t);
        if (NINDIR(&sblock) != nindir) {
                pwarn("INCONSISTENT NINDIR=%d\n", NINDIR(&sblock));
                sblock.fs_nindir = nindir;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("FIX") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (asblk.b_dirty && !bflag) {
                memcpy(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
                flush(fswritefd, &asblk);
        }
        /*
         * read in the summary info.
         */
        asked = 0;
        sblock.fs_csp = calloc(1, sblock.fs_cssize);
        if (sblock.fs_csp == NULL) {
                printf("cannot alloc %u bytes for cylinder group summary area\n",
                    (unsigned)sblock.fs_cssize);
                goto badsblabel;
        }
        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;
                if (bread(fsreadfd, (char *)sblock.fs_csp + i,
                    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
                    size) != 0 && !asked) {
                        pfatal("BAD SUMMARY INFORMATION");
                        if (reply("CONTINUE") == 0) {
                                ckfini(0);
                                errexit("%s", "");
                        }
                        asked++;
                }
        }
        /*
         * allocate and initialize the necessary maps
         */
        bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
        blockmap = calloc(bmapsize, sizeof(char));
        if (blockmap == NULL) {
                printf("cannot alloc %zu bytes for blockmap\n", bmapsize);
                goto badsblabel;
        }
        inostathead = calloc((unsigned)(sblock.fs_ncg),
            sizeof(struct inostatlist));
        if (inostathead == NULL) {
                printf("cannot alloc %zu bytes for inostathead\n",
                    (unsigned)sblock.fs_ncg * sizeof(struct inostatlist));
                goto badsblabel;
        }
        numdirs = MAXIMUM(sblock.fs_cstotal.cs_ndir, 128);
        inplast = 0;
        listmax = numdirs + 10;
        inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
        if (inpsort == NULL) {
                printf("cannot alloc %zu bytes for inpsort\n",
                    (unsigned)listmax * sizeof(struct inoinfo *));
                goto badsblabel;
        }
        inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *));
        if (inphead == NULL) {
                printf("cannot alloc %zu bytes for inphead\n",
                    (unsigned)numdirs * sizeof(struct inoinfo *));
                goto badsblabel;
        }
        bufinit();
        return (1);

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

/*
 * Read in the super block and its summary info.
 */
static int
readsb(int listerr)
{
        daddr_t super = 0;
        int i;

        if (bflag) {
                super = bflag;

                if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
                        return (0);

                if (sblock.fs_magic != FS_UFS1_MAGIC &&
                    sblock.fs_magic != FS_UFS2_MAGIC) {
                        badsb(listerr, "MAGIC NUMBER WRONG");
                        return (0);
                }
        } else {
                for (i = 0; sbtry[i] != -1; i++) {
                        super = sbtry[i] / DEV_BSIZE;

                        if (bread(fsreadfd, (char *)&sblock, super,
                            (long)SBSIZE) != 0)
                                return (0);

                        if (sblock.fs_magic != FS_UFS1_MAGIC &&
                            sblock.fs_magic != FS_UFS2_MAGIC)
                                continue; /* Not a superblock */

                        /*
                         * Do not look for an FFS1 file system at SBLOCK_UFS2.
                         * Doing so will find the wrong super-block for file
                         * systems with 64k block size.
                         */
                        if (sblock.fs_magic == FS_UFS1_MAGIC &&
                            sbtry[i] == SBLOCK_UFS2)
                                continue;

                        if (sblock.fs_magic == FS_UFS2_MAGIC &&
                            sblock.fs_sblockloc != sbtry[i])
                                continue; /* Not a superblock */

                        break;
                }

                if (sbtry[i] == -1) {
                        badsb(listerr, "MAGIC NUMBER WRONG");
                        return (0);
                }
        }

        sblk.b_bno = super;
        sblk.b_size = SBSIZE;

        /*
         * run a few consistency checks of the super block
         */
        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_magic == FS_UFS1_MAGIC) {
                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, "SBSIZE PREPOSTEROUSLY LARGE");
                return (0);
        }

        if (!POWEROF2(sblock.fs_bsize) || sblock.fs_bsize < MINBSIZE ||
            sblock.fs_bsize > MAXBSIZE) {
                badsb(listerr, "ILLEGAL BLOCK SIZE IN SUPERBLOCK");
                return (0);
        }

        if (!POWEROF2(sblock.fs_fsize) || sblock.fs_fsize > sblock.fs_bsize ||
            sblock.fs_fsize < sblock.fs_bsize / MAXFRAG) {
                badsb(listerr, "ILLEGAL FRAGMENT SIZE IN SUPERBLOCK");
                return (0);
        }

        if (bflag)
                goto out;
        getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
        if (asblk.b_errs)
                return (0);
        if (cmpsb(&sblock, &altsblock)) {
                if (debug) {
                        long *nlp, *olp, *endlp;

                        printf("superblock mismatches\n");
                        nlp = (long *)&altsblock;
                        olp = (long *)&sblock;
                        endlp = olp + (sblock.fs_sbsize / sizeof *olp);
                        for ( ; olp < endlp; olp++, nlp++) {
                                if (*olp == *nlp)
                                        continue;
                                printf("offset %d, original %ld, alternate %ld\n",
                                    (int)(olp - (long *)&sblock), *olp, *nlp);
                        }
                }
                badsb(listerr,
                    "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN LAST ALTERNATE");
                return (0);
        }
out:
        if (sblock.fs_magic == FS_UFS1_MAGIC) {
                sblock.fs_time = sblock.fs_ffs1_time;
                sblock.fs_size = sblock.fs_ffs1_size;
                sblock.fs_dsize = sblock.fs_ffs1_dsize;
                sblock.fs_csaddr = sblock.fs_ffs1_csaddr;
                sblock.fs_cstotal.cs_ndir = sblock.fs_ffs1_cstotal.cs_ndir;
                sblock.fs_cstotal.cs_nbfree = sblock.fs_ffs1_cstotal.cs_nbfree;
                sblock.fs_cstotal.cs_nifree = sblock.fs_ffs1_cstotal.cs_nifree;
                sblock.fs_cstotal.cs_nffree = sblock.fs_ffs1_cstotal.cs_nffree;
        }
        havesb = 1;
        return (1);
}

void
badsb(int listerr, char *s)
{

        if (!listerr)
                return;
        if (preen)
                printf("%s: ", cdevname());
        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!
 */
int
calcsb(char *dev, int devfd, struct fs *fs, struct disklabel *lp,
    uint32_t sblockloc)
{
        struct partition *pp;
        char *cp;
        int i;

        cp = strchr(dev, '\0');
        if ((cp == NULL || DL_PARTNAME2NUM(cp[-1]) == -1) &&
            !isdigit((unsigned char)cp[-1])) {
                pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
                return (0);
        }
        cp--;
        if (lp == NULL) {
                pfatal("%s: CANNOT READ DISKLABEL\n", dev);
                return (0);
        }
        if (isdigit((unsigned char)*cp))
                pp = &lp->d_partitions[0];
        else
                pp = &lp->d_partitions[DL_PARTNAME2NUM(*cp)];
        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);
        }
        memset(fs, 0, sizeof(struct fs));
        fs->fs_fsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock);
        fs->fs_frag = DISKLABELV1_FFS_FRAG(pp->p_fragblock);
        fs->fs_fpg = pp->p_cpg * fs->fs_frag;
        fs->fs_bsize = fs->fs_fsize * fs->fs_frag;
        fs->fs_nspf = DL_SECTOBLK(lp, fs->fs_fsize / lp->d_secsize);
        for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
                fs->fs_fsbtodb++;
        /*
         * fs->fs_size is in fragments, DL_GETPSIZE() is in disk sectors
         * and fs_nspf is in DEV_BSIZE blocks. Shake well.
         */
        fs->fs_size = DL_SECTOBLK(lp, DL_GETPSIZE(pp)) / fs->fs_nspf;
        fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg);
        fs->fs_sblkno = roundup(
                howmany(sblockloc + SBSIZE, fs->fs_fsize),
                fs->fs_frag);

        return (1);
}

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

        if (ioctl(fd, DIOCGDINFO, (char *)&lab) == -1) {
                if (s == NULL)
                        return (NULL);
                pwarn("ioctl (CGDINFO): %s\n", strerror(errno));
                errexit("%s: can't read disk label\n", s);
        }
        return (&lab);
}

/*
 * Compare two superblocks
 */
static int
cmpsb(struct fs *sb, struct fs *asb)
{
        /*
         * Only compare fields which should be the same, and ignore ones
         * likely to change to ensure future compatibility.
         */
        if (asb->fs_sblkno != sb->fs_sblkno ||
            asb->fs_cblkno != sb->fs_cblkno ||
            asb->fs_iblkno != sb->fs_iblkno ||
            asb->fs_dblkno != sb->fs_dblkno ||
            asb->fs_cgoffset != sb->fs_cgoffset ||
            asb->fs_cgmask != sb->fs_cgmask ||
            asb->fs_ncg != sb->fs_ncg ||
            asb->fs_bsize != sb->fs_bsize ||
            asb->fs_fsize != sb->fs_fsize ||
            asb->fs_frag != sb->fs_frag ||
            asb->fs_bmask != sb->fs_bmask ||
            asb->fs_fmask != sb->fs_fmask ||
            asb->fs_bshift != sb->fs_bshift ||
            asb->fs_fshift != sb->fs_fshift ||
            asb->fs_fragshift != sb->fs_fragshift ||
            asb->fs_fsbtodb != sb->fs_fsbtodb ||
            asb->fs_sbsize != sb->fs_sbsize ||
            asb->fs_nindir != sb->fs_nindir ||
            asb->fs_inopb != sb->fs_inopb ||
            asb->fs_cssize != sb->fs_cssize ||
            asb->fs_cpg != sb->fs_cpg ||
            asb->fs_ipg != sb->fs_ipg ||
            asb->fs_fpg != sb->fs_fpg ||
            asb->fs_magic != sb->fs_magic)
                    return (1);
        /* they're the same */
        return (0);
}