/*
 * 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.
 *
 * @(#)setup.c  8.10 (Berkeley) 5/9/95
 * $FreeBSD: src/sbin/fsck/setup.c,v 1.17.2.4 2002/06/24 05:10:41 dillon Exp $
 */

#define DKTYPENAMES
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/diskslice.h>

#include <vfs/ufs/dinode.h>
#include <vfs/ufs/fs.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>

#include "fsck.h"

struct bufarea sblk;            /* file system superblock */
struct inoinfo **inphead, **inpsort;    /* Inode cache data structures. */
long numdirs, dirhash, listmax, inplast, dirhashmask;
long    dev_bsize;              /* computed value of DEV_BSIZE */
long    secsize;                /* actual disk sector size */
char    fflag;                  /* force check, ignore clean flag */
int     bflag;                  /* location of alternate super block */
int     cvtlevel;               /* convert to newer file system format */
int     doinglevel1;            /* converting to new cylinder group format */
int     doinglevel2;            /* converting to new inode format */
char    usedsoftdep;            /* just fix soft dependency inconsistencies */
char    havesb;                 /* superblock has been read */
int     fsreadfd;               /* file descriptor for reading file system */
int     fswritefd;              /* file descriptor for writing file system */
ufs_daddr_t maxfsblock;         /* number of blocks in the file system */
char    *blockmap;              /* ptr to primary blk allocation map */
ufs1_ino_t      maxino;                 /* number of inodes in file system */


struct bufarea asblk;
#define altsblock (*asblk.b_un.b_fs)

static void badsb(int listerr, char *s);
static int readsb(int listerr);

/*
 * Read in a superblock finding an alternate if necessary.
 * Return 1 if successful, 0 if unsuccessful, -1 if filesystem
 * is already clean (preen mode only).
 */
int
setup(char *dev)
{
        long size, asked, i, j;
        long skipclean, bmapsize;
        off_t sizepb;
        struct stat statb;

        havesb = 0;
        fswritefd = -1;
        skipclean = fflag ? 0 : preen;
        if (stat(dev, &statb) < 0) {
                printf("Can't stat %s: %s\n", dev, strerror(errno));
                return (0);
        }
        if ((statb.st_mode & S_IFMT) != S_IFCHR &&
            (statb.st_mode & S_IFMT) != S_IFBLK) {
                pfatal("%s is not a disk device", dev);
                if (reply("CONTINUE") == 0)
                        return (0);
        }
        if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
                printf("Can't open %s: %s\n", dev, strerror(errno));
                return (0);
        }
        if (preen == 0)
                printf("** %s", dev);
        if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
                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)
                errx(EEXIT, "cannot allocate space for superblock");

        /*
         * Figure out the device block size and the sector size.  The
         * block size is updated by readsb() later on.
         */
        {
                struct partinfo pinfo;

                if (ioctl(fsreadfd, DIOCGPART, &pinfo) == 0) {
                        dev_bsize = secsize = pinfo.media_blksize;
                } else {
                        dev_bsize = secsize = DEV_BSIZE;
                }
        }

        /*
         * Read in the superblock, looking for alternates if necessary
         */
        if (readsb(1) == 0) {
                skipclean = 0;
                if (bflag || preen)
                        return(0);
                if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
                        return (0);
                bflag = 32;
                if (readsb(0) == 0) {
                        printf(
                            "YOU MUST USE THE -b OPTION TO FSCK TO SPECIFY\n"
                            "THE LOCATION OF AN ALTERNATE SUPER-BLOCK TO\n"
                            "SUPPLY NEEDED INFORMATION; SEE fsck(8).");
                        bflag = 0;
                        return(0);
                }
                pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
                bflag = 0;
        }
        if (skipclean && sblock.fs_clean) {
                pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
                return (-1);
        }
        maxfsblock = sblock.fs_size;
        maxino = 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_nsect) {
                pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
                        sblock.fs_interleave);
                sblock.fs_interleave = 1;
                if (preen)
                        printf(" (FIXED)\n");
                if (preen || reply("SET TO DEFAULT") == 1) {
                        sbdirty();
                        dirty(&asblk);
                }
        }
        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_inodefmt >= FS_44INODEFMT) {
                newinofmt = 1;
        } else {
                sblock.fs_qbmask = ~sblock.fs_bmask;
                sblock.fs_qfmask = ~sblock.fs_fmask;
                /* This should match the kernel limit in ffs_oldfscompat(). */
                sblock.fs_maxfilesize = (u_int64_t)1 << 39;
                newinofmt = 0;
        }
        /*
         * Convert to new inode format.
         */
        if (cvtlevel >= 2 && sblock.fs_inodefmt < FS_44INODEFMT) {
                if (preen)
                        pwarn("CONVERTING TO NEW INODE FORMAT\n");
                else if (!reply("CONVERT TO NEW INODE FORMAT"))
                        return(0);
                doinglevel2++;
                sblock.fs_inodefmt = FS_44INODEFMT;
                sizepb = sblock.fs_bsize;
                sblock.fs_maxfilesize = sblock.fs_bsize * UFS_NDADDR - 1;
                for (i = 0; i < UFS_NIADDR; i++) {
                        sizepb *= NINDIR(&sblock);
                        sblock.fs_maxfilesize += sizepb;
                }
                sblock.fs_maxsymlinklen = UFS1_MAXSYMLINKLEN;
                sblock.fs_qbmask = ~sblock.fs_bmask;
                sblock.fs_qfmask = ~sblock.fs_fmask;
                sbdirty();
                dirty(&asblk);
        }
        /*
         * Convert to new cylinder group format.
         */
        if (cvtlevel >= 1 && sblock.fs_postblformat == FS_42POSTBLFMT) {
                if (preen)
                        pwarn("CONVERTING TO NEW CYLINDER GROUP FORMAT\n");
                else if (!reply("CONVERT TO NEW CYLINDER GROUP FORMAT"))
                        return(0);
                doinglevel1++;
                sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT;
                sblock.fs_nrpos = 8;
                sblock.fs_postbloff =
                    (char *)(&sblock.fs_opostbl[0][0]) -
                    (char *)(&sblock.fs_firstfield);
                sblock.fs_rotbloff = &sblock.fs_space[0] -
                    (u_char *)(&sblock.fs_firstfield);
                sblock.fs_cgsize =
                        fragroundup(&sblock, CGSIZE(&sblock));
                sbdirty();
                dirty(&asblk);
        }
        if (asblk.b_dirty && !bflag) {
                memmove(&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);
        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);
                                exit(EEXIT);
                        }
                        asked++;
                }
        }
        /*
         * allocate and initialize the necessary maps
         */
        bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(short));
        blockmap = calloc((unsigned)bmapsize, sizeof (char));
        if (blockmap == NULL) {
                printf("cannot alloc %u bytes for blockmap\n",
                    (unsigned)bmapsize);
                goto badsb;
        }
        inostathead = calloc((unsigned)(sblock.fs_ncg),
            sizeof(struct inostatlist));
        if (inostathead == NULL) {
                printf("cannot alloc %u bytes for inostathead\n",
                    (unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
                goto badsb;
        }
        numdirs = sblock.fs_cstotal.cs_ndir;

        /*
         * Calculate the directory hash table size.  Do not allocate 
         * a ridiculous amount of memory if we have a lot of directories.
         */
        for (dirhash = 16; dirhash < numdirs; dirhash <<= 1)
                ;
        if (dirhash > 1024*1024)
                dirhash /= 8;
        dirhashmask = dirhash - 1;

        if (numdirs == 0) {
                printf("numdirs is zero, try using an alternate superblock\n");
                goto badsb;
        }
        inplast = 0;
        listmax = numdirs + 10;
        inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
        inphead = calloc((unsigned)dirhash, sizeof(struct inoinfo *));
        if (inpsort == NULL || inphead == NULL) {
                printf("cannot allocate base structures for %ld directories\n",
                        numdirs);
                goto badsb;
        }
        bufinit();
        if (sblock.fs_flags & FS_DOSOFTDEP)
                usedsoftdep = 1;
        else
                usedsoftdep = 0;
        return (1);

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

/*
 * Read in the super block and its summary info.
 */
static int
readsb(int listerr)
{
        ufs_daddr_t super = bflag ? bflag : SBOFF / dev_bsize;

        if (bread(fsreadfd, (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;
        if (bflag) {
                havesb = 1;
                return (1);
        }
        /*
         * Compare all fields that should not differ in 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 (altsblock.fs_sblkno != sblock.fs_sblkno ||
            altsblock.fs_cblkno != sblock.fs_cblkno ||
            altsblock.fs_iblkno != sblock.fs_iblkno ||
            altsblock.fs_dblkno != sblock.fs_dblkno ||
            altsblock.fs_cgoffset != sblock.fs_cgoffset ||
            altsblock.fs_cgmask != sblock.fs_cgmask ||
            altsblock.fs_ncg != sblock.fs_ncg ||
            altsblock.fs_bsize != sblock.fs_bsize ||
            altsblock.fs_fsize != sblock.fs_fsize ||
            altsblock.fs_frag != sblock.fs_frag ||
            altsblock.fs_bmask != sblock.fs_bmask ||
            altsblock.fs_fmask != sblock.fs_fmask ||
            altsblock.fs_bshift != sblock.fs_bshift ||
            altsblock.fs_fshift != sblock.fs_fshift ||
            altsblock.fs_fragshift != sblock.fs_fragshift ||
            altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
            altsblock.fs_sbsize != sblock.fs_sbsize ||
            altsblock.fs_nindir != sblock.fs_nindir ||
            altsblock.fs_inopb != sblock.fs_inopb ||
            altsblock.fs_cssize != sblock.fs_cssize ||
            altsblock.fs_cpg != sblock.fs_cpg ||
            altsblock.fs_ipg != sblock.fs_ipg ||
            altsblock.fs_fpg != sblock.fs_fpg ||
            altsblock.fs_magic != sblock.fs_magic) {
                badsb(listerr,
                "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
                return (0);
        }
        havesb = 1;
        return (1);
}

static void
badsb(int listerr, char *s)
{

        if (!listerr)
                return;
        if (preen)
                printf("%s: ", cdevname);
        pfatal("BAD SUPER BLOCK: %s\n", s);
}