/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */
#ifdef CROSS
#include </usr/include/stdio.h>
#else
#include <stdio.h>
#endif
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/inode.h>
#include <sys/fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/swap.h>
#include "fsck.h"

int
setup(dev)
    char *dev;
{
    dev_t rootdev;
    off_t smapsz, lncntsz, allocd;
    daddr_t bcnt, nscrblk;
    struct stat statb;
    BUFAREA *bp;

    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);
    }
    if ((statb.st_mode & S_IFMT) != S_IFBLK &&
        (statb.st_mode & S_IFMT) != S_IFCHR) {
#ifndef CROSS
        if (reply("file is not a block or character device; OK") == 0)
            return (0);
#endif
    }
    if (rootdev == statb.st_rdev)
        hotroot++;
    dfile.rfdes = open(dev, O_RDONLY);
    if (dfile.rfdes < 0) {
        printf("Can't open %s\n", dev);
        return (0);
    }
    if (preen == 0)
        printf("** %s", dev);
    if (nflag || (dfile.wfdes = open(dev, O_RDWR)) < 0) {
        dfile.wfdes = -1;
        if (preen)
            pfatal("NO WRITE ACCESS\n");
        printf(" (NO WRITE)");
    }
    if (preen == 0)
        printf("\n");
    dfile.mod = 0;
    lfdir = 0;
    initbarea(&sblk);
    initbarea(&fileblk);
    initbarea(&inoblk);
    /*
     * Read in the super block and its summary info.
     */
    if (bread(&dfile, (char *)&sblock, SUPERB, SBSIZE) != 0)
        return (0);
    sblk.b_bno = SUPERB;
    sblk.b_size = SBSIZE;

    imax = ((ino_t)sblock.fs_isize - (SUPERB+1)) * INOPB;
    fsmin = (daddr_t)sblock.fs_isize;   /* first data blk num */
    fsmax = sblock.fs_fsize;        /* first invalid blk num */
    startib = fsmax;
    if (fsmin >= fsmax ||
        (imax/INOPB) != ((ino_t)sblock.fs_isize-(SUPERB+1))) {
        pfatal("Size check: fsize %ld isize %d\n",
            sblock.fs_fsize,sblock.fs_isize);
        printf("\n");
        ckfini();
        return(0);
    }
    if (preen == 0)
        printf("File System: %.12s\n\n", sblock.fs_fsmnt);
    /*
     * allocate and initialize the necessary maps
     */
    bmapsz = roundup (howmany (fsmax, BITSPB), sizeof (*lncntp));
    smapsz = roundup (howmany ((long) (imax+1), STATEPB), sizeof (*lncntp));
    lncntsz = (long) (imax+1) * sizeof (*lncntp);
    if (bmapsz > smapsz+lncntsz)
        smapsz = bmapsz-lncntsz;
    bzero(membase, memsize);
    muldup = enddup = duplist;
    zlnp = zlnlist;

    if ((off_t)memsize < bmapsz + smapsz + lncntsz) {
        bmapsz = roundup(bmapsz, DEV_BSIZE);
        smapsz = roundup(smapsz, DEV_BSIZE);
        lncntsz = roundup(lncntsz, DEV_BSIZE);
        nscrblk = (bmapsz + smapsz + lncntsz) >> DEV_BSHIFT;

        /* Use /dev/temp0 as a scratch file. */
        strcpy(scrfile, "/dev/temp0");
        sfile.wfdes = open(scrfile, O_RDWR);
        if (! sfile.wfdes) {
            errexit("Unable to open temp device\n");
        }
        allocd = nscrblk;
        ioctl(sfile.wfdes, TFALLOC, &allocd);
        if (allocd != nscrblk) {
            printf("Wanted %lu kbytes, got %lu\n", nscrblk, allocd);
            errexit("Unable to allocate temp space\n");
        }
        sfile.rfdes = open(scrfile, O_RDONLY);
        sfile.offset = 0;

        bp = &((BUFAREA *)membase)[(memsize/sizeof(BUFAREA))];
        poolhead = NULL;
        while(--bp >= (BUFAREA *)membase) {
            initbarea(bp);
            bp->b_next = poolhead;
            poolhead = bp;
        }
        bp = poolhead;
        for(bcnt = 0; bcnt < nscrblk; bcnt++) {
            bp->b_bno = bcnt;
            dirty(bp);
            flush(&sfile,bp);
        }
        blockmap = freemap = statemap = (char *) NULL;
        lncntp = (short *) NULL;
        bmapblk = 0;
        smapblk = bmapblk + bmapsz / DEV_BSIZE;
        lncntblk = smapblk + smapsz / DEV_BSIZE;
        fmapblk = smapblk;
    } else {
        poolhead = NULL;
        blockmap = membase;
        statemap = &membase[bmapsz];
        freemap = statemap;
        lncntp = (short *)&statemap[smapsz];
    }
    return(1);
}