/*      $NetBSD: main.c,v 1.41 2020/04/05 15:25:39 joerg 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.
 */

/*
 * Copyright (c) 1997 Manuel Bouyer.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1986, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c      8.2 (Berkeley) 1/23/94";
#else
__RCSID("$NetBSD: main.c,v 1.41 2020/04/05 15:25:39 joerg Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs.h>
#include <fstab.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>

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

struct bufarea bufhead;
struct bufarea sblk;
struct bufarea asblk;
struct bufarea *pdirbp;
struct bufarea *pbp;
struct bufarea *getdatablk(daddr_t, long);
struct m_ext2fs sblock;
struct dups *duplist;
struct dups *muldup;
struct zlncnt *zlnhead;
struct inoinfo **inphead, **inpsort;
long numdirs, listmax, inplast;
long    dev_bsize;
long    secsize;
char    nflag;
char    yflag;
int     bflag;
int     Uflag;
int     debug;
int     preen;
char    havesb;
char    skipclean;
int     fsmodified;
int     fsreadfd;
int     fswritefd;
int     rerun;
daddr_t maxfsblock;
char    *blockmap;
ino_t   maxino;
ino_t   lastino;
char    *statemap;
u_char  *typemap;
int16_t *lncntp;
ino_t   lfdir;
daddr_t n_blks;
daddr_t n_files;
struct  ext2fs_dinode zino;

static int      argtoi(int, const char *, const char *, int);
static int      checkfilesys(const char *, char *, long, int);
static void     usage(void) __dead;

int
main(int argc, char *argv[])
{
        int ch;
        int ret = FSCK_EXIT_OK;

        ckfinish = ckfini;
        sync();
        skipclean = 1;
        while ((ch = getopt(argc, argv, "b:dfm:npPqUy")) != -1) {
                switch (ch) {
                case 'b':
                        skipclean = 0;
                        bflag = argtoi('b', "number", optarg, 10);
                        printf("Alternate super block location: %d\n", bflag);
                        break;

                case 'd':
                        debug++;
                        break;

                case 'f':
                        skipclean = 0;
                        break;

                case 'm':
                        lfmode = argtoi('m', "mode", optarg, 8);
                        if (lfmode &~ 07777)
                                errexit("bad mode to -m: %o", lfmode);
                        printf("** lost+found creation mode %o\n", lfmode);
                        break;

                case 'n':
                        nflag++;
                        yflag = 0;
                        break;

                case 'p':
                        preen++;
                        break;

                case 'P':
                        /* Progress meter not implemented. */
                        break;

                case 'q':               /* Quiet not implemented */
                        break;

#ifndef SMALL
                case 'U':
                        Uflag++;
                        break;
#endif

                case 'y':
                        yflag++;
                        nflag = 0;
                        break;

                default:
                        usage();
                }
        }

        argc -= optind;
        argv += optind;

        if (!argc)
                usage();

        if (signal(SIGINT, SIG_IGN) != SIG_IGN)
                (void)signal(SIGINT, catch);
        if (preen)
                (void)signal(SIGQUIT, catchquit);

        while (argc-- > 0) {
                int nret = checkfilesys(blockcheck(*argv++), 0, 0L, 0);
                if (ret < nret)
                        ret = nret;
        }

        return returntosingle ? FSCK_EXIT_UNRESOLVED : ret;
}

static int
argtoi(int flag, const char *req, const char *str, int base)
{
        char *cp;
        int ret;

        ret = (int)strtol(str, &cp, base);
        if (cp == str || *cp)
                errexit("-%c flag requires a %s", flag, req);
        return (ret);
}

/*
 * Check the specified filesystem.
 */
/* ARGSUSED */
static int
checkfilesys(const char *filesys, char *mntpt, long auxdata, int child)
{
        daddr_t n_bfree;
        struct dups *dp;
        struct zlncnt *zlnp;
        int i;

        if (preen && child)
                (void)signal(SIGQUIT, voidquit);
        setcdevname(filesys, preen);
        if (debug && preen)
                pwarn("starting\n");
        switch (setup(filesys)) {
        case 0:
                if (preen)
                        pfatal("CAN'T CHECK FILE SYSTEM.");
                /* FALLTHROUGH */
        case -1:
                return FSCK_EXIT_OK;
        }
        /*
         * 1: scan inodes tallying blocks used
         */
        if (preen == 0) {
                if (sblock.e2fs.e2fs_rev > E2FS_REV0) {
                        printf("** Last Mounted on %s\n",
                            sblock.e2fs.e2fs_fsmnt);
                }
                if (hotroot())
                        printf("** Root file system\n");
                printf("** Phase 1 - Check Blocks and Sizes\n");
        }
        pass1();

        /*
         * 1b: locate first references to duplicates, if any
         */
        if (duplist) {
                if (preen)
                        pfatal("INTERNAL ERROR: dups with -p");
                printf("** Phase 1b - Rescan For More DUPS\n");
                pass1b();
        }

        /*
         * 2: traverse directories from root to mark all connected directories
         */
        if (preen == 0)
                printf("** Phase 2 - Check Pathnames\n");
        pass2();

        /*
         * 3: scan inodes looking for disconnected directories
         */
        if (preen == 0)
                printf("** Phase 3 - Check Connectivity\n");
        pass3();

        /*
         * 4: scan inodes looking for disconnected files; check reference counts
         */
        if (preen == 0)
                printf("** Phase 4 - Check Reference Counts\n");
        pass4();

        /*
         * 5: check and repair resource counts in cylinder groups
         */
        if (preen == 0)
                printf("** Phase 5 - Check Cyl groups\n");
        pass5();

        /*
         * print out summary statistics
         */
        n_bfree = sblock.e2fs.e2fs_fbcount;
                
        pwarn("%lld files, %lld used, %lld free\n",
            (long long)n_files, (long long)n_blks, (long long)n_bfree);
        if (debug &&
                /* 9 reserved and unused inodes in FS */
            (n_files -= maxino - 9 - sblock.e2fs.e2fs_ficount))
                printf("%lld files missing\n", (long long)n_files);
        if (debug) {
                for (i = 0; i < sblock.e2fs_ncg; i++)
                        n_blks +=  cgoverhead(i);
                n_blks += sblock.e2fs.e2fs_first_dblock;
                if (n_blks -= maxfsblock - n_bfree)
                        printf("%lld blocks missing\n", (long long)n_blks);
                if (duplist != NULL) {
                        printf("The following duplicate blocks remain:");
                        for (dp = duplist; dp; dp = dp->next)
                                printf(" %lld,", (long long)dp->dup);
                        printf("\n");
                }
                if (zlnhead != NULL) {
                        printf("The following zero link count inodes remain:");
                        for (zlnp = zlnhead; zlnp; zlnp = zlnp->next)
                                printf(" %llu,",
                                    (unsigned long long)zlnp->zlncnt);
                        printf("\n");
                }
        }
        zlnhead = (struct zlncnt *)0;
        duplist = (struct dups *)0;
        muldup = (struct dups *)0;
        inocleanup();
        if (fsmodified) {
                time_t t;
                (void)time(&t);
                sblock.e2fs.e2fs_wtime = t;
                sblock.e2fs.e2fs_lastfsck = t;
                sbdirty();
        }
        ckfini(1);
        free(blockmap);
        free(statemap);
        free((char *)lncntp);
        if (!fsmodified)
                return FSCK_EXIT_OK;
        if (!preen)
                printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
        if (rerun)
                printf("\n***** PLEASE RERUN FSCK *****\n");
        if (hotroot()) {
                struct statvfs stfs_buf;
                /*
                 * We modified the root.  Do a mount update on
                 * it, unless it is read-write, so we can continue.
                 */
                if (statvfs("/", &stfs_buf) == 0) {
                        long flags = stfs_buf.f_flag;
                        struct ufs_args args;

                        if (flags & MNT_RDONLY) {
                                args.fspec = 0;
                                flags |= MNT_UPDATE | MNT_RELOAD;
                                if (mount(MOUNT_EXT2FS, "/", flags,
                                    &args, sizeof args) == 0)
                                        return FSCK_EXIT_OK;
                        }
                }
                if (!preen)
                        printf("\n***** REBOOT NOW *****\n");
                sync();
                return FSCK_EXIT_ROOT_CHANGED;
        }
        return FSCK_EXIT_OK;
}

static void
usage(void)
{

        (void) fprintf(stderr,
            "usage: %s [-dfnpUy] [-b block] [-m mode] filesystem ...\n",
            getprogname());
        exit(FSCK_EXIT_USAGE);
}