hexdump: check blocksize when display data

[thirdparty/util-linux.git] / disk-utils / fsck.minix.c

/*
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * fsck.minix.c - a file system consistency checker for Linux.
 *
 * (C) 1991, 1992 Linus Torvalds. This file may be redistributed
 * as per the GNU copyleft.
 *
 *
 * 09.11.91  -  made the first rudimentary functions
 *
 * 10.11.91  -  updated, does checking, no repairs yet.
 *              Sent out to the mailing-list for testing.
 *
 * 14.11.91  -  Testing seems to have gone well. Added some
 *              correction-code, and changed some functions.
 *
 * 15.11.91  -  More correction code. Hopefully it notices most
 *              cases now, and tries to do something about them.
 *
 * 16.11.91  -  More corrections (thanks to Mika Jalava). Most
 *              things seem to work now. Yeah, sure.
 *
 *
 * 19.04.92  -  Had to start over again from this old version, as a
 *              kernel bug ate my enhanced fsck in February.
 *
 * 28.02.93  -  added support for different directory entry sizes..
 *
 * Sat Mar  6 18:59:42 1993, faith@cs.unc.edu: Output namelen with
 *                           super-block information
 *
 * Sat Oct  9 11:17:11 1993, faith@cs.unc.edu: make exit status conform
 *                           to that required by fsutil
 *
 * Mon Jan  3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu)
 *                            Added support for file system valid flag.  Also
 *                            added program_version variable and output of
 *                            program name and version number when program
 *                            is executed.
 *
 * 30.10.94 - added support for v2 filesystem
 *            (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de)
 *
 * 10.12.94  -  added test to prevent checking of mounted fs adapted
 *              from Theodore Ts'o's (tytso@athena.mit.edu) e2fsck
 *              program.  (Daniel Quinlan, quinlan@yggdrasil.com)
 *
 * 01.07.96  - Fixed the v2 fs stuff to use the right #defines and such
 *             for modern libcs (janl@math.uio.no, Nicolai Langfeldt)
 *
 * 02.07.96  - Added C bit fiddling routines from rmk@ecs.soton.ac.uk
 *             (Russell King).  He made them for ARM.  It would seem
 *             that the ARM is powerful enough to do this in C whereas
 *             i386 and m64k must use assembly to get it fast >:-)
 *             This should make minix fsck systemindependent.
 *             (janl@math.uio.no, Nicolai Langfeldt)
 *
 * 04.11.96  - Added minor fixes from Andreas Schwab to avoid compiler
 *             warnings.  Added mc68k bitops from
 *             Joerg Dorchain <dorchain@mpi-sb.mpg.de>.
 *
 * 06.11.96  - Added v2 code submitted by Joerg Dorchain, but written by
 *             Andreas Schwab.
 *
 * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 *
 * 2008-04-06 James Youngman <jay@gnu.org>
 * - Issue better error message if we fail to open the device.
 * - Restore terminal state if we get a fatal signal.
 *
 *
 * I've had no time to add comments - hopefully the function names
 * are comments enough. As with all file system checkers, this assumes
 * the file system is quiescent - don't use it on a mounted device
 * unless you can be sure nobody is writing to it (and remember that the
 * kernel can write to it when it searches for files).
 *
 */

#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <termios.h>
#include <sys/stat.h>
#include <signal.h>
#include <getopt.h>

#include "c.h"
#include "exitcodes.h"
#include "minix_programs.h"
#include "nls.h"
#include "pathnames.h"
#include "bitops.h"
#include "ismounted.h"
#include "all-io.h"
#include "closestream.h"
#include "rpmatch.h"
#include "strutils.h"

#define ROOT_INO 1
#define YESNO_LENGTH 64

/* Global variables used in minix_programs.h inline functions */
int fs_version = 1;
char *super_block_buffer;

static char *inode_buffer;

#define Inode (((struct minix_inode *) inode_buffer) - 1)
#define Inode2 (((struct minix2_inode *) inode_buffer) - 1)

static char *device_name;
static int device_fd;
static int repair, automatic, verbose, list, show, warn_mode, force;
static int directory, regular, blockdev, chardev, links, symlinks, total;

static int changed;             /* flags if the filesystem has been changed */
static int errors_uncorrected;  /* flag if some error was not corrected */
static size_t dirsize = 16;
static size_t namelen = 14;
static struct termios termios;
static volatile sig_atomic_t termios_set;

/* File-name data */
#define MAX_DEPTH 50
static int name_depth;
static char name_list[MAX_DEPTH][MINIX_NAME_MAX + 1];

/* Copy of the previous, just for error reporting - see get_current_name.  This
 * is a waste of 12kB or so.  */
static char current_name[MAX_DEPTH * (MINIX_NAME_MAX + 1) + 1];

static unsigned char *inode_count = NULL;
static unsigned char *zone_count = NULL;

static void recursive_check(unsigned int ino);
static void recursive_check2(unsigned int ino);

static char *inode_map;
static char *zone_map;

#define inode_in_use(x) (isset(inode_map,(x)) != 0)
#define zone_in_use(x) (isset(zone_map,(x)-get_first_zone()+1) != 0)

#define mark_inode(x) (setbit(inode_map,(x)),changed=1)
#define unmark_inode(x) (clrbit(inode_map,(x)),changed=1)

#define mark_zone(x) (setbit(zone_map,(x)-get_first_zone()+1),changed=1)
#define unmark_zone(x) (clrbit(zone_map,(x)-get_first_zone()+1),changed=1)

static void
reset(void) {
        if (termios_set)
                tcsetattr(STDIN_FILENO, TCSANOW, &termios);
}

static void
fatalsig(int sig) {
        /* We received a fatal signal.  Reset the terminal.  Also reset the
         * signal handler and re-send the signal, so that the parent process
         * knows which signal actually caused our death.  */
        signal(sig, SIG_DFL);
        reset();
        raise(sig);
}

static void __attribute__((__noreturn__))
leave(int status) {
        reset();
        exit(status);
}

static void __attribute__((__noreturn__))
usage(void) {
        FILE *out = stdout;
        fputs(USAGE_HEADER, out);
        fprintf(out, _(" %s [options] <device>\n"), program_invocation_short_name);
        fputs(USAGE_SEPARATOR, out);
        fputs(_("Check the consistency of a Minix filesystem.\n"), out);
        fputs(USAGE_OPTIONS, out);
        fputs(_(" -l, --list       list all filenames\n"), out);
        fputs(_(" -a, --auto       automatic repair\n"), out);
        fputs(_(" -r, --repair     interactive repair\n"), out);
        fputs(_(" -v, --verbose    be verbose\n"), out);
        fputs(_(" -s, --super      output super-block information\n"), out);
        fputs(_(" -m, --uncleared  activate mode not cleared warnings\n"), out);
        fputs(_(" -f, --force      force check\n"), out);
        fputs(USAGE_SEPARATOR, out);
        fprintf(out, USAGE_HELP_OPTIONS(18));
        fprintf(out, USAGE_MAN_TAIL("fsck.minix(8)"));
        exit(FSCK_EX_OK);
}

static void die(const char *fmt, ...)
    __attribute__ ((__format__(__printf__, 1, 2)));

static void
die(const char *fmt, ...) {
        va_list ap;

        fprintf(stderr, UTIL_LINUX_VERSION);
        va_start(ap, fmt);
        vfprintf(stderr, fmt, ap);
        va_end(ap);
        fputc('\n', stderr);
        leave(FSCK_EX_ERROR);
}

/* This simply goes through the file-name data and prints out the current file.  */
static void
get_current_name(void) {
        int i = 0, ct;
        char *p, *q;

        q = current_name;
        while (i < name_depth) {
                p = name_list[i++];
                ct = namelen;
                *q++ = '/';
                while (ct-- && *p)
                        *q++ = *p++;
        }
        if (i == 0)
                *q++ = '/';
        *q = 0;
}

static int
ask(const char *string, int def) {
        int resp;
        char input[YESNO_LENGTH];

        if (!repair) {
                printf("\n");
                errors_uncorrected = 1;
                return 0;
        }
        if (automatic) {
                printf("\n");
                if (!def)
                        errors_uncorrected = 1;
                return def;
        }
        /* TRANSLATORS: these yes no questions uses rpmatch(), and should be
         * translated.  */
        printf(def ? _("%s (y/n)? ") : _("%s (n/y)? "), string);
        fflush(stdout);
        ignore_result( fgets(input, YESNO_LENGTH, stdin) );
        resp = rpmatch(input);
        switch (resp) {
        case RPMATCH_INVALID:
                /* def = def */
                break;
        case RPMATCH_NO:
        case RPMATCH_YES:
                def = resp;
                break;
        default:
                /* rpmatch bug? */
                abort();
        }
        if (def)
                printf(_("y\n"));
        else {
                printf(_("n\n"));
                errors_uncorrected = 1;
        }
        return def;
}

/* Make certain that we aren't checking a filesystem that is on a mounted
 * partition.  Code adapted from e2fsck, Copyright (C) 1993, 1994 Theodore
 * Ts'o.  Also licensed under GPL.  */
static void
check_mount(void) {
        int cont;

        if (!is_mounted(device_name))
                return;

        printf(_("%s is mounted.         "), device_name);
        if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))
                cont = ask(_("Do you really want to continue"), 0);
        else
                cont = 0;
        if (!cont) {
                printf(_("check aborted.\n"));
                exit(FSCK_EX_OK);
        }
}


static int is_valid_zone_nr(unsigned short nr)
{
        if (nr < get_first_zone())
                return 0;
        if (nr >= get_nzones())
                return 0;
        return 1;
}

/* check_zone_nr checks to see that *nr is a valid zone nr.  If it isn't, it
 * will possibly be repaired.  Check_zone_nr sets *corrected if an error was
 * corrected, and returns the zone (0 for no zone or a bad zone-number).  */
static int
check_zone_nr(unsigned short *nr, int *corrected) {
        if (!*nr)
                return 0;

        if (*nr < get_first_zone()) {
                get_current_name();
                printf(_("Zone nr < FIRSTZONE in file `%s'."), current_name);
        } else if (*nr >= get_nzones()) {
                get_current_name();
                printf(_("Zone nr >= ZONES in file `%s'."), current_name);
        } else
                return *nr;

        if (ask(_("Remove block"), 1)) {
                *nr = 0;
                *corrected = 1;
        }
        return 0;
}

static int
check_zone_nr2(unsigned int *nr, int *corrected) {
        if (!*nr)
                return 0;

        if (*nr < get_first_zone()) {
                get_current_name();
                printf(_("Zone nr < FIRSTZONE in file `%s'."), current_name);
        } else if (*nr >= get_nzones()) {
                get_current_name();
                printf(_("Zone nr >= ZONES in file `%s'."), current_name);
        } else
                return *nr;

        if (ask(_("Remove block"), 1)) {
                *nr = 0;
                *corrected = 1;
        }
        return 0;
}

/* read-block reads block nr into the buffer at addr.  */
static void
read_block(unsigned int nr, char *addr) {
        if (!nr) {
                memset(addr, 0, MINIX_BLOCK_SIZE);
                return;
        }
        if (MINIX_BLOCK_SIZE * nr != lseek(device_fd, MINIX_BLOCK_SIZE * nr, SEEK_SET)) {
                get_current_name();
                printf(_("Read error: unable to seek to block in file '%s'\n"),
                       current_name);
                memset(addr, 0, MINIX_BLOCK_SIZE);
                errors_uncorrected = 1;
        } else if (MINIX_BLOCK_SIZE != read(device_fd, addr, MINIX_BLOCK_SIZE)) {
                get_current_name();
                printf(_("Read error: bad block in file '%s'\n"), current_name);
                memset(addr, 0, MINIX_BLOCK_SIZE);
                errors_uncorrected = 1;
        }
}

/* write_block writes block nr to disk.  */
static void
write_block(unsigned int nr, char *addr) {
        if (!nr)
                return;
        if (nr < get_first_zone() || nr >= get_nzones()) {
                printf(_("Internal error: trying to write bad block\n"
                         "Write request ignored\n"));
                errors_uncorrected = 1;
                return;
        }
        if (MINIX_BLOCK_SIZE * nr != lseek(device_fd, MINIX_BLOCK_SIZE * nr, SEEK_SET))
                die(_("seek failed in write_block"));
        if (MINIX_BLOCK_SIZE != write(device_fd, addr, MINIX_BLOCK_SIZE)) {
                get_current_name();
                printf(_("Write error: bad block in file '%s'\n"),
                       current_name);
                errors_uncorrected = 1;
        }
}

/* map-block calculates the absolute block nr of a block in a file.  It sets
 * 'changed' if the inode has needed changing, and re-writes any indirect
 * blocks with errors.  */
static int
map_block(struct minix_inode *inode, unsigned int blknr) {
        unsigned short ind[MINIX_BLOCK_SIZE >> 1];
        unsigned short dind[MINIX_BLOCK_SIZE >> 1];
        int blk_chg, block, result;
        size_t range;

        if (blknr < 7)
                return check_zone_nr(inode->i_zone + blknr, &changed);
        blknr -= 7;
        if (blknr < 512) {
                block = check_zone_nr(inode->i_zone + 7, &changed);
                read_block(block, (char *)ind);
                blk_chg = 0;
                result = check_zone_nr(blknr + ind, &blk_chg);
                if (blk_chg)
                        write_block(block, (char *)ind);
                return result;
        }
        blknr -= 512;
        block = check_zone_nr(inode->i_zone + 8, &changed);
        read_block(block, (char *)dind);
        blk_chg = 0;
        range = blknr / 512;
        if (ARRAY_SIZE(dind) <= range) {
                printf(_("Warning: block out of range\n"));
                return 1;
        }
        result = check_zone_nr(dind + range, &blk_chg);
        if (blk_chg)
                write_block(block, (char *)dind);
        block = result;
        read_block(block, (char *)ind);
        blk_chg = 0;
        result = check_zone_nr(ind + (blknr % 512), &blk_chg);
        if (blk_chg)
                write_block(block, (char *)ind);
        return result;
}

static int
map_block2(struct minix2_inode *inode, unsigned int blknr) {
        unsigned int ind[MINIX_BLOCK_SIZE >> 2];
        unsigned int dind[MINIX_BLOCK_SIZE >> 2];
        unsigned int tind[MINIX_BLOCK_SIZE >> 2];
        int blk_chg, block, result;

        if (blknr < 7)
                return check_zone_nr2(inode->i_zone + blknr, &changed);
        blknr -= 7;
        if (blknr < 256) {
                block = check_zone_nr2(inode->i_zone + 7, &changed);
                read_block(block, (char *)ind);
                blk_chg = 0;
                result = check_zone_nr2(blknr + ind, &blk_chg);
                if (blk_chg)
                        write_block(block, (char *)ind);
                return result;
        }
        blknr -= 256;
        if (blknr < 256 * 256) {
                block = check_zone_nr2(inode->i_zone + 8, &changed);
                read_block(block, (char *)dind);
                blk_chg = 0;
                result = check_zone_nr2(dind + blknr / 256, &blk_chg);
                if (blk_chg)
                        write_block(block, (char *)dind);
                block = result;
                read_block(block, (char *)ind);
                blk_chg = 0;
                result = check_zone_nr2(ind + blknr % 256, &blk_chg);
                if (blk_chg)
                        write_block(block, (char *)ind);
                return result;
        }
        blknr -= 256 * 256;
        block = check_zone_nr2(inode->i_zone + 9, &changed);
        read_block(block, (char *)tind);
        blk_chg = 0;
        result = check_zone_nr2(tind + blknr / (256 * 256), &blk_chg);
        if (blk_chg)
                write_block(block, (char *)tind);
        block = result;
        read_block(block, (char *)dind);
        blk_chg = 0;
        result = check_zone_nr2(dind + (blknr / 256) % 256, &blk_chg);
        if (blk_chg)
                write_block(block, (char *)dind);
        block = result;
        read_block(block, (char *)ind);
        blk_chg = 0;
        result = check_zone_nr2(ind + blknr % 256, &blk_chg);
        if (blk_chg)
                write_block(block, (char *)ind);
        return result;
}

static void
write_super_block(void) {
        /* v3 super block does not track state */
        if (fs_version == 3)
                return;
        /* Set the state of the filesystem based on whether or not there are
         * uncorrected errors.  The filesystem valid flag is unconditionally
         * set if we get this far.  */
        Super.s_state |= MINIX_VALID_FS;
        if (errors_uncorrected)
                Super.s_state |= MINIX_ERROR_FS;
        else
                Super.s_state &= ~MINIX_ERROR_FS;

        if (MINIX_BLOCK_SIZE != lseek(device_fd, MINIX_BLOCK_SIZE, SEEK_SET))
                die(_("seek failed in write_super_block"));
        if (MINIX_BLOCK_SIZE != write(device_fd, super_block_buffer, MINIX_BLOCK_SIZE))
                die(_("unable to write super-block"));
}

static void
write_tables(void) {
        unsigned long buffsz = get_inode_buffer_size();
        unsigned long imaps = get_nimaps();
        unsigned long zmaps = get_nzmaps();

        write_super_block();

        if (write_all(device_fd, inode_map, imaps * MINIX_BLOCK_SIZE))
                die(_("Unable to write inode map"));

        if (write_all(device_fd, zone_map, zmaps * MINIX_BLOCK_SIZE))
                die(_("Unable to write zone map"));

        if (write_all(device_fd, inode_buffer, buffsz))
                die(_("Unable to write inodes"));
}

static void
get_dirsize(void) {
        int block;
        char blk[MINIX_BLOCK_SIZE];
        size_t size;

        if (fs_version == 2 || fs_version == 3)
                block = Inode2[ROOT_INO].i_zone[0];
        else
                block = Inode[ROOT_INO].i_zone[0];
        read_block(block, blk);

        for (size = 16; size < MINIX_BLOCK_SIZE; size <<= 1) {
                if (strcmp(blk + size + 2, "..") == 0) {
                        dirsize = size;
                        namelen = size - 2;
                        return;
                }
        }
        /* use defaults */
}

static void
read_superblock(void) {
        if (MINIX_BLOCK_SIZE != lseek(device_fd, MINIX_BLOCK_SIZE, SEEK_SET))
                die(_("seek failed"));

        super_block_buffer = calloc(1, MINIX_BLOCK_SIZE);
        if (!super_block_buffer)
                die(_("unable to alloc buffer for superblock"));

        if (MINIX_BLOCK_SIZE != read(device_fd, super_block_buffer, MINIX_BLOCK_SIZE))
                die(_("unable to read super block"));
        if (Super.s_magic == MINIX_SUPER_MAGIC) {
                namelen = 14;
                dirsize = 16;
                fs_version = 1;
        } else if (Super.s_magic == MINIX_SUPER_MAGIC2) {
                namelen = 30;
                dirsize = 32;
                fs_version = 1;
        } else if (Super.s_magic == MINIX2_SUPER_MAGIC) {
                namelen = 14;
                dirsize = 16;
                fs_version = 2;
        } else if (Super.s_magic == MINIX2_SUPER_MAGIC2) {
                namelen = 30;
                dirsize = 32;
                fs_version = 2;
        } else if (Super3.s_magic == MINIX3_SUPER_MAGIC) {
                namelen = 60;
                dirsize = 64;
                fs_version = 3;
        } else
                die(_("bad magic number in super-block"));
        if (get_zone_size() != 0 || MINIX_BLOCK_SIZE != 1024)
                die(_("Only 1k blocks/zones supported"));
        if (get_ninodes() == 0 || get_ninodes() == UINT32_MAX)
                die(_("bad s_ninodes field in super-block"));
        if (get_nimaps() * MINIX_BLOCK_SIZE * 8 < get_ninodes() + 1)
                die(_("bad s_imap_blocks field in super-block"));
        if (get_first_zone() > (off_t) get_nzones())
                die(_("bad s_firstdatazone field in super-block"));
        if (get_nzmaps() * MINIX_BLOCK_SIZE * 8 <
            get_nzones() - get_first_zone() + 1)
                die(_("bad s_zmap_blocks field in super-block"));
}

static void
read_tables(void) {
        unsigned long inodes = get_ninodes();
        size_t buffsz = get_inode_buffer_size();
        off_t norm_first_zone = first_zone_data();
        off_t first_zone = get_first_zone();
        unsigned long zones = get_nzones();
        unsigned long imaps = get_nimaps();
        unsigned long zmaps = get_nzmaps();
        ssize_t rc;

        inode_map = malloc(imaps * MINIX_BLOCK_SIZE);
        if (!inode_map)
                die(_("Unable to allocate buffer for inode map"));
        zone_map = malloc(zmaps * MINIX_BLOCK_SIZE);
        if (!zone_map)
                die(_("Unable to allocate buffer for zone map"));
        inode_buffer = malloc(buffsz);
        if (!inode_buffer)
                die(_("Unable to allocate buffer for inodes"));
        inode_count = calloc(1, inodes + 1);
        if (!inode_count)
                die(_("Unable to allocate buffer for inode count"));
        zone_count = calloc(1, zones);
        if (!zone_count)
                die(_("Unable to allocate buffer for zone count"));

        rc = read(device_fd, inode_map, imaps * MINIX_BLOCK_SIZE);
        if (rc < 0 || imaps * MINIX_BLOCK_SIZE != (size_t) rc)
                die(_("Unable to read inode map"));

        rc = read(device_fd, zone_map, zmaps * MINIX_BLOCK_SIZE);
        if (rc < 0 || zmaps * MINIX_BLOCK_SIZE != (size_t) rc)
                die(_("Unable to read zone map"));

        rc = read(device_fd, inode_buffer, buffsz);
        if (rc < 0 || buffsz != (size_t) rc)
                die(_("Unable to read inodes"));
        if (norm_first_zone != first_zone) {
                printf(_("Warning: Firstzone != Norm_firstzone\n"));
                errors_uncorrected = 1;
        }
        get_dirsize();
        if (show) {
                printf(_("%ld inodes\n"), inodes);
                printf(_("%ld blocks\n"), zones);
                printf(_("Firstdatazone=%jd (%jd)\n"),
                        (intmax_t)first_zone, (intmax_t)norm_first_zone);
                printf(_("Zonesize=%d\n"), MINIX_BLOCK_SIZE << get_zone_size());
                printf(_("Maxsize=%zu\n"), get_max_size());
                if (fs_version < 3)
                        printf(_("Filesystem state=%d\n"), Super.s_state);
                printf(_("namelen=%zd\n\n"), namelen);
        }
}

static struct minix_inode *
get_inode(unsigned int nr) {
        struct minix_inode *inode;

        if (!nr || nr > get_ninodes())
                return NULL;
        total++;
        inode = Inode + nr;
        if (!inode_count[nr]) {
                if (!inode_in_use(nr)) {
                        get_current_name();
                        printf(_("Inode %d marked unused, "
                                 "but used for file '%s'\n"), nr, current_name);
                        if (repair) {
                                if (ask(_("Mark in use"), 1))
                                        mark_inode(nr);
                        } else {
                                errors_uncorrected = 1;
                        }
                }
                if (S_ISDIR(inode->i_mode))
                        directory++;
                else if (S_ISREG(inode->i_mode))
                        regular++;
                else if (S_ISCHR(inode->i_mode))
                        chardev++;
                else if (S_ISBLK(inode->i_mode))
                        blockdev++;
                else if (S_ISLNK(inode->i_mode))
                        symlinks++;
                else if (S_ISSOCK(inode->i_mode))
                        ;
                else if (S_ISFIFO(inode->i_mode))
                        ;
                else {
                        get_current_name();
                        printf(_("The file `%s' has mode %05o\n"),
                               current_name, inode->i_mode);
                }

        } else
                links++;
        if (!++inode_count[nr]) {
                printf(_("Warning: inode count too big.\n"));
                inode_count[nr]--;
                errors_uncorrected = 1;
        }
        return inode;
}

static struct minix2_inode *
get_inode2(unsigned int nr) {
        struct minix2_inode *inode;

        if (!nr || nr > get_ninodes())
                return NULL;
        total++;
        inode = Inode2 + nr;
        if (!inode_count[nr]) {
                if (!inode_in_use(nr)) {
                        get_current_name();
                        printf(_("Inode %d marked unused, "
                                 "but used for file '%s'\n"), nr, current_name);
                        if (repair) {
                                if (ask(_("Mark in use"), 1))
                                        mark_inode(nr);
                                else
                                        errors_uncorrected = 1;
                        }
                }
                if (S_ISDIR(inode->i_mode))
                        directory++;
                else if (S_ISREG(inode->i_mode))
                        regular++;
                else if (S_ISCHR(inode->i_mode))
                        chardev++;
                else if (S_ISBLK(inode->i_mode))
                        blockdev++;
                else if (S_ISLNK(inode->i_mode))
                        symlinks++;
                else if (S_ISSOCK(inode->i_mode)) ;
                else if (S_ISFIFO(inode->i_mode)) ;
                else {
                        get_current_name();
                        printf(_("The file `%s' has mode %05o\n"),
                               current_name, inode->i_mode);
                }
        } else
                links++;
        if (!++inode_count[nr]) {
                printf(_("Warning: inode count too big.\n"));
                inode_count[nr]--;
                errors_uncorrected = 1;
        }
        return inode;
}

static void
check_root(void) {
        struct minix_inode *inode = Inode + ROOT_INO;

        if (!inode || !S_ISDIR(inode->i_mode))
                die(_("root inode isn't a directory"));
}

static void
check_root2(void) {
        struct minix2_inode *inode = Inode2 + ROOT_INO;

        if (!inode || !S_ISDIR(inode->i_mode))
                die(_("root inode isn't a directory"));
}

static int
add_zone(unsigned short *znr, int *corrected) {
        int block;

        block = check_zone_nr(znr, corrected);
        if (!block)
                return 0;
        if (zone_count[block]) {
                get_current_name();
                printf(_("Block has been used before. Now in file `%s'."),
                       current_name);
                if (ask(_("Clear"), 1)) {
                        *znr = 0;
                        block = 0;
                        *corrected = 1;
                }
        }
        if (!block)
                return 0;
        if (!zone_in_use(block)) {
                get_current_name();
                printf(_("Block %d in file `%s' is marked not in use."),
                       block, current_name);
                if (ask(_("Correct"), 1))
                        mark_zone(block);
        }
        if (!++zone_count[block])
                zone_count[block]--;
        return block;
}

static int
add_zone2(unsigned int *znr, int *corrected) {
        int block;

        block = check_zone_nr2(znr, corrected);
        if (!block)
                return 0;
        if (zone_count[block]) {
                get_current_name();
                printf(_("Block has been used before. Now in file `%s'."),
                       current_name);
                if (ask(_("Clear"), 1)) {
                        *znr = 0;
                        block = 0;
                        *corrected = 1;
                }
        }
        if (!block)
                return 0;
        if (!zone_in_use(block)) {
                get_current_name();
                printf(_("Block %d in file `%s' is marked not in use."),
                       block, current_name);
                if (ask(_("Correct"), 1))
                        mark_zone(block);
        }
        if (!++zone_count[block])
                zone_count[block]--;
        return block;
}

static void
add_zone_ind(unsigned short *znr, int *corrected) {
        static char blk[MINIX_BLOCK_SIZE];
        int i, chg_blk = 0;
        int block;

        block = add_zone(znr, corrected);
        if (!block)
                return;
        read_block(block, blk);
        for (i = 0; i < (MINIX_BLOCK_SIZE >> 1); i++)
                add_zone(i + (unsigned short *)blk, &chg_blk);
        if (chg_blk)
                write_block(block, blk);
}

static void
add_zone_ind2(unsigned int *znr, int *corrected) {
        static char blk[MINIX_BLOCK_SIZE];
        int i, chg_blk = 0;
        int block;

        block = add_zone2(znr, corrected);
        if (!block)
                return;
        read_block(block, blk);
        for (i = 0; i < MINIX_BLOCK_SIZE >> 2; i++)
                add_zone2(i + (unsigned int *)blk, &chg_blk);
        if (chg_blk)
                write_block(block, blk);
}

static void
add_zone_dind(unsigned short *znr, int *corrected) {
        static char blk[MINIX_BLOCK_SIZE];
        int i, blk_chg = 0;
        int block;

        block = add_zone(znr, corrected);
        if (!block)
                return;
        read_block(block, blk);
        for (i = 0; i < (MINIX_BLOCK_SIZE >> 1); i++)
                add_zone_ind(i + (unsigned short *)blk, &blk_chg);
        if (blk_chg)
                write_block(block, blk);
}

static void
add_zone_dind2(unsigned int *znr, int *corrected) {
        static char blk[MINIX_BLOCK_SIZE];
        int i, blk_chg = 0;
        int block;

        block = add_zone2(znr, corrected);
        if (!block)
                return;
        read_block(block, blk);
        for (i = 0; i < MINIX_BLOCK_SIZE >> 2; i++)
                add_zone_ind2(i + (unsigned int *)blk, &blk_chg);
        if (blk_chg)
                write_block(block, blk);
}

static void
add_zone_tind2(unsigned int *znr, int *corrected) {
        static char blk[MINIX_BLOCK_SIZE];
        int i, blk_chg = 0;
        int block;

        block = add_zone2(znr, corrected);
        if (!block)
                return;
        read_block(block, blk);
        for (i = 0; i < MINIX_BLOCK_SIZE >> 2; i++)
                add_zone_dind2(i + (unsigned int *)blk, &blk_chg);
        if (blk_chg)
                write_block(block, blk);
}

static void
check_zones(unsigned int i) {
        struct minix_inode *inode;

        if (!i || i > get_ninodes())
                return;
        if (inode_count[i] > 1) /* have we counted this file already? */
                return;
        inode = Inode + i;
        if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
            !S_ISLNK(inode->i_mode))
                return;
        for (i = 0; i < 7; i++)
                add_zone(i + inode->i_zone, &changed);
        add_zone_ind(7 + inode->i_zone, &changed);
        add_zone_dind(8 + inode->i_zone, &changed);
}

static void
check_zones2(unsigned int i) {
        struct minix2_inode *inode;

        if (!i || i > get_ninodes())
                return;
        if (inode_count[i] > 1) /* have we counted this file already? */
                return;
        inode = Inode2 + i;
        if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode)
            && !S_ISLNK(inode->i_mode))
                return;
        for (i = 0; i < 7; i++)
                add_zone2(i + inode->i_zone, &changed);
        add_zone_ind2(7 + inode->i_zone, &changed);
        add_zone_dind2(8 + inode->i_zone, &changed);
        add_zone_tind2(9 + inode->i_zone, &changed);
}

static void
check_file(struct minix_inode *dir, unsigned int offset) {
        static char blk[MINIX_BLOCK_SIZE + 2];
        struct minix_inode *inode;
        unsigned int ino;
        char *name;
        int block;

        block = map_block(dir, offset / MINIX_BLOCK_SIZE);
        read_block(block, blk);
        name = blk + (offset % MINIX_BLOCK_SIZE) + 2;
        ino = *(unsigned short *)(name - 2);
        if (ino > get_ninodes()) {
                get_current_name();
                printf(_("The directory '%s' contains a bad inode number "
                         "for file '%.*s'."), current_name, (int)namelen, name);
                if (ask(_(" Remove"), 1)) {
                        *(unsigned short *)(name - 2) = 0;
                        write_block(block, blk);
                }
                ino = 0;
        }
        if (name_depth < MAX_DEPTH)
                xstrncpy(name_list[name_depth], name, namelen);
        else
                return;
        name_depth++;
        inode = get_inode(ino);
        name_depth--;
        if (!offset) {
                if (!inode || strcmp(".", name) != 0) {
                        get_current_name();
                        printf(_("%s: bad directory: '.' isn't first\n"),
                               current_name);
                        errors_uncorrected = 1;
                } else
                        return;
        }
        if (offset == dirsize) {
                if (!inode || strcmp("..", name) != 0) {
                        get_current_name();
                        printf(_("%s: bad directory: '..' isn't second\n"),
                               current_name);
                        errors_uncorrected = 1;
                } else
                        return;
        }
        if (!inode)
                return;
        if (name_depth < MAX_DEPTH)
                xstrncpy(name_list[name_depth], name, namelen);
        else
                return;
        name_depth++;
        if (list) {
                if (verbose)
                        printf("%6d %07o %3d ", ino,
                               inode->i_mode, inode->i_nlinks);
                get_current_name();
                printf("%s", current_name);
                if (S_ISDIR(inode->i_mode))
                        printf(":\n");
                else
                        printf("\n");
        }
        check_zones(ino);
        if (inode && S_ISDIR(inode->i_mode))
                recursive_check(ino);
        name_depth--;
}

static void
check_file2(struct minix2_inode *dir, unsigned int offset) {
        static char blk[MINIX_BLOCK_SIZE + 4];
        struct minix2_inode *inode;
        ino_t ino;
        char *name;
        int block;
        const int version_offset = fs_version == 3 ? 4 : 2;

        block = map_block2(dir, offset / MINIX_BLOCK_SIZE);
        read_block(block, blk);
        name = blk + (offset % MINIX_BLOCK_SIZE) + version_offset;
        ino = version_offset == 4 ? *(uint32_t *)(name - version_offset)
                                  : *(uint16_t *)(name - version_offset);
        if (ino > get_ninodes()) {
                get_current_name();
                printf(_("The directory '%s' contains a bad inode number "
                         "for file '%.*s'."), current_name, (int)namelen, name);
                if (ask(_(" Remove"), 1)) {
                        memset(name - version_offset, 0, version_offset);
                        write_block(block, blk);
                }
                ino = 0;
        }
        if (name_depth < MAX_DEPTH)
                xstrncpy(name_list[name_depth], name, namelen);
        else
                return;
        name_depth++;
        inode = get_inode2(ino);
        name_depth--;
        if (!offset) {
                if (!inode || strcmp(".", name) != 0) {
                        get_current_name();
                        printf(_("%s: bad directory: '.' isn't first\n"),
                               current_name);
                        errors_uncorrected = 1;
                } else
                        return;
        }
        if (offset == dirsize) {
                if (!inode || strcmp("..", name) != 0) {
                        get_current_name();
                        printf(_("%s: bad directory: '..' isn't second\n"),
                               current_name);
                        errors_uncorrected = 1;
                } else
                        return;
        }
        if (!inode)
                return;
        name_depth++;
        if (list) {
                if (verbose)
                        printf("%6ju %07o %3d ", (uintmax_t)ino, inode->i_mode,
                               inode->i_nlinks);
                get_current_name();
                printf("%s", current_name);
                if (S_ISDIR(inode->i_mode))
                        printf(":\n");
                else
                        printf("\n");
        }
        check_zones2(ino);
        if (inode && S_ISDIR(inode->i_mode))
                recursive_check2(ino);
        name_depth--;
}

static void
recursive_check(unsigned int ino) {
        struct minix_inode *dir;
        off_t offset;

        dir = Inode + ino;
        if (!S_ISDIR(dir->i_mode))
                die(_("internal error"));
        if (dir->i_size < 2 * dirsize) {
                get_current_name();
                printf(_("%s: bad directory: size < 32"), current_name);
                errors_uncorrected = 1;
        }

        if ((!repair || automatic) && !is_valid_zone_nr(*dir->i_zone)) {
                get_current_name();
                printf(_("%s: bad directory: invalid i_zone, use --repair to fix\n"), current_name);
                return;
        }
        for (offset = 0; offset < dir->i_size; offset += dirsize)
                check_file(dir, offset);
}

static void
recursive_check2(unsigned int ino) {
        struct minix2_inode *dir;
        off_t offset;

        dir = Inode2 + ino;
        if (!S_ISDIR(dir->i_mode))
                die(_("internal error"));
        if (dir->i_size < 2 * dirsize) {
                get_current_name();
                printf(_("%s: bad directory: size < 32"), current_name);
                errors_uncorrected = 1;
        }
        for (offset = 0; offset < dir->i_size; offset += dirsize)
                check_file2(dir, offset);
}

static int
bad_zone(int i) {
        char buffer[1024];

        if (MINIX_BLOCK_SIZE * i != lseek(device_fd, MINIX_BLOCK_SIZE * i, SEEK_SET))
                die(_("seek failed in bad_zone"));
        return (MINIX_BLOCK_SIZE != read(device_fd, buffer, MINIX_BLOCK_SIZE));
}

static void
check_counts(void) {
        unsigned long i;

        for (i = 1; i <= get_ninodes(); i++) {
                if (!inode_in_use(i) && Inode[i].i_mode && warn_mode) {
                        printf(_("Inode %lu mode not cleared."), i);
                        if (ask(_("Clear"), 1)) {
                                Inode[i].i_mode = 0;
                                changed = 1;
                        }
                }
                if (!inode_count[i]) {
                        if (!inode_in_use(i))
                                continue;
                        printf(_("Inode %lu not used, marked used in the bitmap."), i);
                        if (ask(_("Clear"), 1))
                                unmark_inode(i);
                        continue;
                }
                if (!inode_in_use(i)) {
                        printf(_("Inode %lu used, marked unused in the bitmap."), i);
                        if (ask(_("Set"), 1))
                                mark_inode(i);
                }
                if (Inode[i].i_nlinks != inode_count[i]) {
                        printf(_("Inode %lu (mode = %07o), i_nlinks=%d, counted=%d."),
                               i, Inode[i].i_mode, Inode[i].i_nlinks,
                               inode_count[i]);
                        if (ask(_("Set i_nlinks to count"), 1)) {
                                Inode[i].i_nlinks = inode_count[i];
                                changed = 1;
                        }
                }
        }
        for (i = get_first_zone(); i < get_nzones(); i++) {
                if (zone_in_use(i) == zone_count[i])
                        continue;
                if (!zone_count[i]) {
                        if (bad_zone(i))
                                continue;
                        printf(_("Zone %lu: marked in use, no file uses it."),
                               i);
                        if (ask(_("Unmark"), 1))
                                unmark_zone(i);
                        continue;
                }
                if (zone_in_use(i))
                        printf(_("Zone %lu: in use, counted=%d\n"),
                               i, zone_count[i]);
                else
                        printf(_("Zone %lu: not in use, counted=%d\n"),
                               i, zone_count[i]);
        }
}

static void
check_counts2(void) {
        unsigned long i;

        for (i = 1; i <= get_ninodes(); i++) {
                if (!inode_in_use(i) && Inode2[i].i_mode && warn_mode) {
                        printf(_("Inode %lu mode not cleared."), i);
                        if (ask(_("Clear"), 1)) {
                                Inode2[i].i_mode = 0;
                                changed = 1;
                        }
                }
                if (!inode_count[i]) {
                        if (!inode_in_use(i))
                                continue;
                        printf(_("Inode %lu not used, marked used in the bitmap."), i);
                        if (ask(_("Clear"), 1))
                                unmark_inode(i);
                        continue;
                }
                if (!inode_in_use(i)) {
                        printf(_("Inode %lu used, marked unused in the bitmap."), i);
                        if (ask(_("Set"), 1))
                                mark_inode(i);
                }
                if (Inode2[i].i_nlinks != inode_count[i]) {
                        printf(_("Inode %lu (mode = %07o), i_nlinks=%d, counted=%d."),
                               i, Inode2[i].i_mode, Inode2[i].i_nlinks,
                               inode_count[i]);
                        if (ask(_("Set i_nlinks to count"), 1)) {
                                Inode2[i].i_nlinks = inode_count[i];
                                changed = 1;
                        }
                }
        }
        for (i = get_first_zone(); i < get_nzones(); i++) {
                if (zone_in_use(i) == zone_count[i])
                        continue;
                if (!zone_count[i]) {
                        if (bad_zone(i))
                                continue;
                        printf(_("Zone %lu: marked in use, no file uses it."),
                               i);
                        if (ask(_("Unmark"), 1))
                                unmark_zone(i);
                        continue;
                }
                if (zone_in_use(i))
                        printf(_("Zone %lu: in use, counted=%d\n"),
                               i, zone_count[i]);
                else
                        printf(_("Zone %lu: not in use, counted=%d\n"),
                               i, zone_count[i]);
        }
}

static void
check(void) {
        memset(inode_count, 0, (get_ninodes() + 1) * sizeof(*inode_count));
        memset(zone_count, 0, get_nzones() * sizeof(*zone_count));
        check_zones(ROOT_INO);
        recursive_check(ROOT_INO);
        check_counts();
}

static void
check2(void) {
        memset(inode_count, 0, (get_ninodes() + 1) * sizeof(*inode_count));
        memset(zone_count, 0, get_nzones() * sizeof(*zone_count));
        check_zones2(ROOT_INO);
        recursive_check2(ROOT_INO);
        check_counts2();
}

int
main(int argc, char **argv) {
        struct termios tmp;
        int count;
        int retcode = FSCK_EX_OK;
        int i;
        static const struct option longopts[] = {
                {"list", no_argument, NULL, 'l'},
                {"auto", no_argument, NULL, 'a'},
                {"repair", no_argument, NULL, 'r'},
                {"verbose", no_argument, NULL, 'v'},
                {"super", no_argument, NULL, 's'},
                {"uncleared", no_argument, NULL, 'm'},
                {"force", no_argument, NULL, 'f'},
                {"version", no_argument, NULL, 'V'},
                {"help", no_argument, NULL, 'h'},
                {NULL, 0, NULL, 0}
        };

        setlocale(LC_ALL, "");
        bindtextdomain(PACKAGE, LOCALEDIR);
        textdomain(PACKAGE);
        close_stdout_atexit();

        strutils_set_exitcode(FSCK_EX_USAGE);

        if (INODE_SIZE * MINIX_INODES_PER_BLOCK != MINIX_BLOCK_SIZE)
                die(_("bad inode size"));
        if (INODE2_SIZE * MINIX2_INODES_PER_BLOCK != MINIX_BLOCK_SIZE)
                die(_("bad v2 inode size"));

        while ((i = getopt_long(argc, argv, "larvsmfVh", longopts, NULL)) != -1)
                switch (i) {
                case 'l':
                        list = 1;
                        break;
                case 'a':
                        automatic = 1;
                        repair = 1;
                        break;
                case 'r':
                        automatic = 0;
                        repair = 1;
                        break;
                case 'v':
                        verbose = 1;
                        break;
                case 's':
                        show = 1;
                        break;
                case 'm':
                        warn_mode = 1;
                        break;
                case 'f':
                        force = 1;
                        break;
                case 'V':
                        print_version(FSCK_EX_OK);
                case 'h':
                        usage();
                default:
                        errtryhelp(FSCK_EX_USAGE);
                }
        argc -= optind;
        argv += optind;
        if (0 < argc) {
                device_name = argv[0];
        } else {
                warnx(_("no device specified"));
                errtryhelp(FSCK_EX_USAGE);
        }
        check_mount();          /* trying to check a mounted filesystem? */
        if (repair && !automatic && (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO)))
                die(_("need terminal for interactive repairs"));

        device_fd = open(device_name, repair ? O_RDWR : O_RDONLY);
        if (device_fd < 0)
                die(_("cannot open %s: %s"), device_name, strerror(errno));
        for (count = 0; count < 3; count++)
                sync();
        read_superblock();

        /* Determine whether or not we should continue with the checking.  This
         * is based on the status of the filesystem valid and error flags and
         * whether or not the -f switch was specified on the command line.  */
        if (fs_version < 3 && !(Super.s_state & MINIX_ERROR_FS) &&
            (Super.s_state & MINIX_VALID_FS) && !force) {
                if (repair)
                        printf(_("%s is clean, no check.\n"), device_name);
                return retcode;
        }

        if (force)
                printf(_("Forcing filesystem check on %s.\n"), device_name);
        else if (repair)
                printf(_("Filesystem on %s is dirty, needs checking.\n"),
                       device_name);

        read_tables();

        /* Restore the terminal state on fatal signals.  We don't do this for
         * SIGALRM, SIGUSR1 or SIGUSR2.  */
        signal(SIGINT, fatalsig);
        signal(SIGQUIT, fatalsig);
        signal(SIGTERM, fatalsig);

        if (repair && !automatic) {
                tcgetattr(STDIN_FILENO, &termios);
                tmp = termios;
                tmp.c_lflag &= ~(ICANON | ECHO);
                tcsetattr(STDIN_FILENO, TCSANOW, &tmp);
                termios_set = 1;
        }

        if (fs_version == 2 || fs_version == 3) {
                check_root2();
                check2();
        } else {
                check_root();
                check();
        }
        if (verbose) {
                unsigned long inode, free;

                for (inode = 1, free = 0; inode <= get_ninodes(); inode++)
                        if (!inode_in_use(inode))
                                free++;
                printf(_("\n%6ld inodes used (%ld%%)\n"),
                       (get_ninodes() - free),
                       100 * (get_ninodes() - free) / get_ninodes());
                for (inode = get_first_zone(), free = 0; inode < get_nzones(); inode++)
                        if (!zone_in_use(inode))
                                free++;
                printf(_("%6ld zones used (%ld%%)\n"), (get_nzones() - free),
                       100 * (get_nzones() - free) / get_nzones());
                printf(_("\n%6d regular files\n"
                         "%6d directories\n"
                         "%6d character device files\n"
                         "%6d block device files\n"
                         "%6d links\n"
                         "%6d symbolic links\n"
                         "------\n"
                         "%6d files\n"),
                       regular, directory, chardev, blockdev,
                       links - 2 * directory + 1, symlinks,
                       total - 2 * directory + 1);
        }
        if (changed) {
                write_tables();
                printf(_("----------------------------\n"
                         "FILE SYSTEM HAS BEEN CHANGED\n"
                         "----------------------------\n"));
                for (count = 0; count < 3; count++)
                        sync();
        } else if (repair)
                write_super_block();

        if (repair && !automatic)
                tcsetattr(STDIN_FILENO, TCSANOW, &termios);

        if (close_fd(device_fd) != 0)
                err(FSCK_EX_ERROR, _("write failed"));
        if (changed)
                retcode += 3;
        if (errors_uncorrected)
                retcode += 4;
        return retcode;
}