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     5.3 (Berkeley) %G%";
#endif not lint

#include <sys/param.h>
#include <sys/inode.h>
#include <sys/fs.h>
#include <sys/stat.h>
#include "fsck.h"

char    *calloc();

setup(dev)
        char *dev;
{
        dev_t rootdev;
        struct stat statb;
        daddr_t super = bflag ? bflag : SBLOCK;
        int i, j;
        long size;
        BUFAREA asblk;
#       define altsblock asblk.b_un.b_fs

        if (stat("/", &statb) < 0)
                errexit("Can't stat root\n");
        rootdev = statb.st_dev;
        if (stat(dev, &statb) < 0) {
                printf("Can't stat %s\n", dev);
                return (0);
        }
        rawflg = 0;
        if ((statb.st_mode & S_IFMT) == S_IFBLK)
                ;
        else if ((statb.st_mode & S_IFMT) == S_IFCHR)
                rawflg++;
        else {
                if (reply("file is not a block or character device; OK") == 0)
                        return (0);
        }
        if (rootdev == statb.st_rdev)
                hotroot++;
        if ((dfile.rfdes = open(dev, 0)) < 0) {
                printf("Can't open %s\n", dev);
                return (0);
        }
        if (preen == 0)
                printf("** %s", dev);
        if (nflag || (dfile.wfdes = open(dev, 1)) < 0) {
                dfile.wfdes = -1;
                if (preen)
                        pfatal("NO WRITE ACCESS");
                printf(" (NO WRITE)");
        }
        if (preen == 0)
                printf("\n");
        dfile.mod = 0;
        lfdir = 0;
        initbarea(&sblk);
        initbarea(&fileblk);
        initbarea(&inoblk);
        initbarea(&cgblk);
        initbarea(&asblk);
        /*
         * Read in the super block and its summary info.
         */
        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("MAGIC NUMBER WRONG"); return (0); }
        if (sblock.fs_ncg < 1)
                { badsb("NCG OUT OF RANGE"); return (0); }
        if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG)
                { badsb("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("NCYL DOES NOT JIVE WITH NCG*CPG"); return (0); }
        if (sblock.fs_sbsize > SBSIZE)
                { badsb("SIZE PREPOSTEROUSLY LARGE"); return (0); }
        /*
         * 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();
                }
        }
        /*
         * 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.
         */
        if (bflag)
                goto sbok;
        getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
        if (asblk.b_errs != NULL)
                return (0);
        altsblock.fs_link = sblock.fs_link;
        altsblock.fs_rlink = sblock.fs_rlink;
        altsblock.fs_time = sblock.fs_time;
        altsblock.fs_cstotal = sblock.fs_cstotal;
        altsblock.fs_cgrotor = sblock.fs_cgrotor;
        altsblock.fs_fmod = sblock.fs_fmod;
        altsblock.fs_clean = sblock.fs_clean;
        altsblock.fs_ronly = sblock.fs_ronly;
        altsblock.fs_flags = sblock.fs_flags;
        altsblock.fs_maxcontig = sblock.fs_maxcontig;
        altsblock.fs_minfree = sblock.fs_minfree;
        altsblock.fs_optim = sblock.fs_optim;
        altsblock.fs_rotdelay = sblock.fs_rotdelay;
        altsblock.fs_maxbpg = sblock.fs_maxbpg;
        bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp,
                sizeof sblock.fs_csp);
        bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt,
                sizeof sblock.fs_fsmnt);
        if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize))
                { badsb("TRASHED VALUES IN SUPER BLOCK"); return (0); }
sbok:
        fmax = sblock.fs_size;
        imax = sblock.fs_ncg * sblock.fs_ipg;
        /*
         * read in the summary info.
         */
        for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
                size = sblock.fs_cssize - i < sblock.fs_bsize ?
                    sblock.fs_cssize - i : sblock.fs_bsize;
                sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
                if (bread(&dfile, (char *)sblock.fs_csp[j],
                    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
                    size) != 0)
                        return (0);
        }
        /*
         * allocate and initialize the necessary maps
         */
        bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
        blockmap = calloc((unsigned)bmapsz, sizeof (char));
        if (blockmap == NULL) {
                printf("cannot alloc %d bytes for blockmap\n", bmapsz);
                goto badsb;
        }
        statemap = calloc((unsigned)(imax + 1), sizeof(char));
        if (statemap == NULL) {
                printf("cannot alloc %d bytes for statemap\n", imax + 1);
                goto badsb;
        }
        lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
        if (lncntp == NULL) {
                printf("cannot alloc %d bytes for lncntp\n",
                    (imax + 1) * sizeof(short));
                goto badsb;
        }

        return (1);

badsb:
        ckfini();
        return (0);
#       undef altsblock
}

badsb(s)
        char *s;
{

        if (preen)
                printf("%s: ", devname);
        printf("BAD SUPER BLOCK: %s\n", s);
        pwarn("USE -b OPTION TO FSCK TO SPECIFY LOCATION OF AN ALTERNATE\n");
        pfatal("SUPER-BLOCK TO SUPPLY NEEDED INFORMATION; SEE fsck(8).\n");
}