/*      $OpenBSD: main.c,v 1.30 2023/03/08 04:43:06 guenther Exp $      */
/*      $NetBSD: main.c,v 1.1 1997/06/11 11:21:50 bouyer Exp $  */

/*
 * Copyright (c) 1997 Manuel Bouyer.
 * 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/types.h>
#include <sys/signal.h>
#include <sys/time.h>
#include <sys/mount.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 <err.h>

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

volatile sig_atomic_t   returntosingle;

int     main(int, char *[]);

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

struct bufarea bufhead;         /* head of list of other blks in filesys */
struct bufarea sblk;            /* file system superblock */
struct bufarea asblk;           /* first alternate superblock */
struct bufarea *pdirbp;         /* current directory contents */
struct bufarea *pbp;            /* current inode block */
struct bufarea *getdatablk(daddr32_t, long);
struct m_ext2fs sblock;

struct dups *duplist;           /* head of dup list */
struct dups *muldup;            /* end of unique duplicate dup block numbers */

struct zlncnt *zlnhead;         /* head of zero link count list */

struct inoinfo **inphead, **inpsort;
long numdirs, listmax, inplast;

long    secsize;                /* actual disk sector size */
char    nflag;                  /* assume a no response */
char    yflag;                  /* assume a yes response */
int     bflag;                  /* location of alternate super block */
int     debug;                  /* output debugging info */
int     preen;                  /* just fix normal inconsistencies */
char    havesb;                 /* superblock has been read */
char    skipclean;              /* skip clean file systems if preening */
int     fsmodified;             /* 1 => write done to file system */
int     fsreadfd;               /* file descriptor for reading file system */
int     fswritefd;              /* file descriptor for writing file system */
int     rerun;                  /* rerun fsck.  Only used in non-preen mode */

daddr32_t       maxfsblock;             /* number of blocks in the file system */
char    *blockmap;              /* ptr to primary blk allocation map */
ino_t   maxino;                 /* number of inodes in file system */
ino_t   lastino;                /* last inode in use */
char    *statemap;              /* ptr to inode state table */
u_char  *typemap;               /* ptr to inode type table */
int16_t *lncntp;                /* ptr to link count table */

ino_t   lfdir;                  /* lost & found directory inode number */

daddr32_t       n_blks;                 /* number of blocks in use */
daddr32_t       n_files;                /* number of files in use */

struct  ext2fs_dinode zino;

int
main(int argc, char *argv[])
{
        int ch;
        int ret = 0;

        checkroot();

        sync();
        skipclean = 1;
        while ((ch = getopt(argc, argv, "b:dfm:npy")) != -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 = 1;
                        break;

                case 'f':
                        skipclean = 0;
                        break;

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

                case 'n':
                        nflag = 1;
                        yflag = 0;
                        break;

                case 'p':
                        preen = 1;
                        break;

                case 'y':
                        yflag = 1;
                        nflag = 0;
                        break;

                default:
                        usage();
                }
        }

        argc -= optind;
        argv += optind;

        if (argc != 1)
                usage();

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

        (void)checkfilesys(blockcheck(*argv), 0, 0L, 0);

        if (returntosingle)
                ret = 2;

        exit(ret);
}

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

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

/*
 * Check the specified filesystem.
 */
static int
checkfilesys(char *filesys, char *mntpt, long auxdata, int child)
{
        daddr32_t n_bfree;
        struct dups *dp;
        struct zlncnt *zlnp;
        int i;

        if (preen && child)
                (void)signal(SIGQUIT, voidquit);
        setcdevname(filesys, NULL, preen);
        if (debug && preen)
                pwarn("starting\n");

        switch (setup(filesys)) {
        case 0:
                if (preen)
                        pfatal("CAN'T CHECK FILE SYSTEM.");
        case -1:
                return (0);
        }
        /*
         * 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("%d files, %d used, %d free\n",
            n_files, n_blks, n_bfree);
        if (debug &&
                /* 9 reserved and unused inodes in FS */
            (n_files -= maxino - 9 - sblock.e2fs.e2fs_ficount))
                printf("%d files missing\n", 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("%d blocks missing\n", n_blks);
                if (duplist != NULL) {
                        printf("The following duplicate blocks remain:");
                        for (dp = duplist; dp; dp = dp->next)
                                printf(" %d,", 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 = NULL;
        duplist = NULL;
        muldup = NULL;
        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 (0);
        if (!preen)
                printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
        if (rerun)
                printf("\n***** PLEASE RERUN FSCK *****\n");
        if (hotroot()) {
                struct statfs stfs_buf;
                /*
                 * We modified the root.  Do a mount update on
                 * it, unless it is read-write, so we can continue.
                 */
                if (statfs("/", &stfs_buf) == 0) {
                        long flags = stfs_buf.f_flags;
                        struct ufs_args args;
                        int ret;

                        if (flags & MNT_RDONLY) {
                                args.fspec = 0;
                                args.export_info.ex_flags = 0;
                                args.export_info.ex_root = 0;
                                flags |= MNT_UPDATE | MNT_RELOAD;
                                ret = mount(MOUNT_EXT2FS, "/", flags, &args);
                                if (ret == 0)
                                        return(0);
                        }
                }
                if (!preen)
                        printf("\n***** REBOOT NOW *****\n");
                sync();
                return (4);
        }
        return (0);
}

static void
usage(void)
{
        extern char *__progname;

        (void) fprintf(stderr,
            "usage: %s [-dfnpy] [-b block#] [-m mode] filesystem\n",
            __progname);
        exit(1);
}