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fsck.minix.c

/*
 * fsck.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 rudimetary 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 Mi¶kiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 *
 *
 * 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).
 *
 * Usuage: fsck [-larvsm] device
 *    -l for a listing of all the filenames
 *    -a for automatic repairs (not implemented)
 *    -r for repairs (interactive) (not implemented)
 *    -v for verbose (tells how many files)
 *    -s for super-block info
 *    -m for minix-like "mode not cleared" warnings
 *    -f force filesystem check even if filesystem marked as valid
 *
 * The device may be a block device or a image of one, but this isn't
 * enforced (but it's not much fun on a character device :-). 
 */

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

#include "minix.h"
#include "nls.h"

#ifndef __linux__
#define volatile
#endif

#define ROOT_INO 1

#define UPPER(size,n) ((size+((n)-1))/(n))
#define INODE_SIZE (sizeof(struct minix_inode))
#define INODE_SIZE2 (sizeof(struct minix2_inode))
#define INODE_BLOCKS UPPER(INODES, (version2 ? MINIX2_INODES_PER_BLOCK \
                            : MINIX_INODES_PER_BLOCK))
#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)

#define BITS_PER_BLOCK (BLOCK_SIZE<<3)

static char * program_name = "fsck.minix";
static char * device_name = NULL;
static int IN;
static int repair=0, automatic=0, verbose=0, list=0, show=0, warn_mode=0, 
      force=0;
static int directory=0, regular=0, blockdev=0, chardev=0, links=0,
            symlinks=0, total=0;

static int changed = 0; /* flags if the filesystem has been changed */
static int errors_uncorrected = 0; /* flag if some error was not corrected */
static int dirsize = 16;
static int namelen = 14;
static int version2 = 0;
static struct termios termios;
static int termios_set = 0;

/* File-name data */
#define MAX_DEPTH 50
static int name_depth = 0;
static char name_list[MAX_DEPTH][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*(NAME_MAX+1)+1];

static char * inode_buffer = NULL;
#define Inode (((struct minix_inode *) inode_buffer)-1)
#define Inode2 (((struct minix2_inode *) inode_buffer)-1)
static char super_block_buffer[BLOCK_SIZE];
#define Super (*(struct minix_super_block *)super_block_buffer)
#define INODES ((unsigned long)Super.s_ninodes)
#define ZONES ((unsigned long)(version2 ? Super.s_zones : Super.s_nzones))
#define IMAPS ((unsigned long)Super.s_imap_blocks)
#define ZMAPS ((unsigned long)Super.s_zmap_blocks)
#define FIRSTZONE ((unsigned long)Super.s_firstdatazone)
#define ZONESIZE ((unsigned long)Super.s_log_zone_size)
#define MAXSIZE ((unsigned long)Super.s_max_size)
#define MAGIC (Super.s_magic)
#define NORM_FIRSTZONE (2+IMAPS+ZMAPS+INODE_BLOCKS)

static char *inode_map;
static char *zone_map;

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);

#include "bitops.h"

#define inode_in_use(x) (bit(inode_map,(x)))
#define zone_in_use(x) (bit(zone_map,(x)-FIRSTZONE+1))

#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)-FIRSTZONE+1),changed=1)
#define unmark_zone(x) (clrbit(zone_map,(x)-FIRSTZONE+1),changed=1)

static void
leave(int status) {
      if (termios_set)
            tcsetattr(0, TCSANOW, &termios);
      exit(status);
}

static void
usage(void) {
      fprintf(stderr,
            _("Usage: %s [-larvsmf] /dev/name\n"),
            program_name);
      leave(16);
}

static void
die(const char *str) {
      fprintf(stderr, "%s: %s\n", program_name, str);
      leave(8);
}

/*
 * 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 c;

      if (!repair) {
            printf("\n");
            errors_uncorrected = 1;
            return 0;
      }
      if (automatic) {
            printf("\n");
            if (!def)
                  errors_uncorrected = 1;
            return def;
      }
      printf(def?"%s (y/n)? ":"%s (n/y)? ",string);
      for (;;) {
            fflush(stdout);
            if ((c=getchar())==EOF) {
                    if (!def)
                        errors_uncorrected = 1;
                  return def;
            }
            c=toupper(c);
            if (c == 'Y') {
                  def = 1;
                  break;
            } else if (c == 'N') {
                  def = 0;
                  break;
            } else if (c == ' ' || c == '\n')
                  break;
      }
      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) {
      FILE * f;
      struct mntent * mnt;
      int cont;
      int fd;

      if ((f = setmntent (MOUNTED, "r")) == NULL)
            return;
      while ((mnt = getmntent (f)) != NULL)
            if (strcmp (device_name, mnt->mnt_fsname) == 0)
                  break;
      endmntent (f);
      if (!mnt)
            return;

      /*
       * If the root is mounted read-only, then /etc/mtab is
       * probably not correct; so we won't issue a warning based on
       * it.
       */
      fd = open(MOUNTED, O_RDWR);
      if (fd < 0 && errno == EROFS)
            return;
      else
            close(fd);
      
      printf (_("%s is mounted.      "), device_name);
      if (isatty(0) && isatty(1))
            cont = ask(_("Do you really want to continue"), 0);
      else
            cont = 0;
      if (!cont) {
            printf (_("check aborted.\n"));
            exit (0);
      }
      return;
}

/*
 * 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 < FIRSTZONE) {
            get_current_name();
            printf(_("Zone nr < FIRSTZONE in file `%s'."),
                   current_name);
      } else if (*nr >= ZONES) {
            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 < FIRSTZONE) {
            get_current_name();
            printf (_("Zone nr < FIRSTZONE in file `%s'."),
                  current_name);
      } else if (*nr >= ZONES) {
            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,BLOCK_SIZE);
            return;
      }
      if (BLOCK_SIZE*nr != lseek(IN, 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,BLOCK_SIZE);
            errors_uncorrected = 1;
      } else if (BLOCK_SIZE != read(IN, addr, BLOCK_SIZE)) {
            get_current_name();
            printf(_("Read error: bad block in file '%s'\n"),
                   current_name);
            memset(addr,0,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 < FIRSTZONE || nr >= ZONES) {
            printf(_("Internal error: trying to write bad block\n"
            "Write request ignored\n"));
            errors_uncorrected = 1;
            return;
      }
      if (BLOCK_SIZE*nr != lseek(IN, BLOCK_SIZE*nr, SEEK_SET))
            die(_("seek failed in write_block"));
      if (BLOCK_SIZE != write(IN, addr, 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[BLOCK_SIZE>>1];
      unsigned short dind[BLOCK_SIZE>>1];
      int blk_chg, block, result;

      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;
      result = check_zone_nr(dind + (blknr/512), &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[BLOCK_SIZE >> 2];
      unsigned int dind[BLOCK_SIZE >> 2];
      unsigned int tind[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) {
      /*
       * 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 (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
            die(_("seek failed in write_super_block"));
      if (BLOCK_SIZE != write(IN, super_block_buffer, BLOCK_SIZE))
            die(_("unable to write super-block"));

      return;
}

static void
write_tables(void) {
      write_super_block();

      if (IMAPS*BLOCK_SIZE != write(IN,inode_map,IMAPS*BLOCK_SIZE))
            die(_("Unable to write inode map"));
      if (ZMAPS*BLOCK_SIZE != write(IN,zone_map,ZMAPS*BLOCK_SIZE))
            die(_("Unable to write zone map"));
      if (INODE_BUFFER_SIZE != write(IN,inode_buffer,INODE_BUFFER_SIZE))
            die(_("Unable to write inodes"));
}

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

      if (version2)
            block = Inode2[ROOT_INO].i_zone[0];
      else
            block = Inode[ROOT_INO].i_zone[0];
      read_block (block, blk);
      for (size = 16; size < BLOCK_SIZE; size <<= 1) {
            if (strcmp (blk + size + 2, "..") == 0) {
                  dirsize = size;
                  namelen = size - 2;
                  return;
            }
      }
      /* use defaults */
}

static void
read_superblock(void) {
      if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
            die(_("seek failed"));
      if (BLOCK_SIZE != read(IN, super_block_buffer, BLOCK_SIZE))
            die(_("unable to read super block"));
      if (MAGIC == MINIX_SUPER_MAGIC) {
            namelen = 14;
            dirsize = 16;
            version2 = 0;
      } else if (MAGIC == MINIX_SUPER_MAGIC2) {
            namelen = 30;
            dirsize = 32;
            version2 = 0;
      } else if (MAGIC == MINIX2_SUPER_MAGIC) {
            namelen = 14;
            dirsize = 16;
            version2 = 1;
      } else if (MAGIC == MINIX2_SUPER_MAGIC2) {
            namelen = 30;
            dirsize = 32;
            version2 = 1;
      } else
            die(_("bad magic number in super-block"));
      if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
            die(_("Only 1k blocks/zones supported"));
      if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
            die(_("bad s_imap_blocks field in super-block"));
      if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
            die(_("bad s_zmap_blocks field in super-block"));
}

static void
read_tables(void) {
      inode_map = malloc(IMAPS * BLOCK_SIZE);
      if (!inode_map)
            die(_("Unable to allocate buffer for inode map"));
      zone_map = malloc(ZMAPS * BLOCK_SIZE);
      if (!inode_map)
            die("Unable to allocate buffer for zone map");
      memset(inode_map,0,sizeof(inode_map));
      memset(zone_map,0,sizeof(zone_map));
      inode_buffer = malloc(INODE_BUFFER_SIZE);
      if (!inode_buffer)
            die(_("Unable to allocate buffer for inodes"));
      inode_count = malloc(INODES + 1);
      if (!inode_count)
            die(_("Unable to allocate buffer for inode count"));
      zone_count = malloc(ZONES);
      if (!zone_count)
            die(_("Unable to allocate buffer for zone count"));
      if (IMAPS*BLOCK_SIZE != read(IN,inode_map,IMAPS*BLOCK_SIZE))
            die(_("Unable to read inode map"));
      if (ZMAPS*BLOCK_SIZE != read(IN,zone_map,ZMAPS*BLOCK_SIZE))
            die(_("Unable to read zone map"));
      if (INODE_BUFFER_SIZE != read(IN,inode_buffer,INODE_BUFFER_SIZE))
            die(_("Unable to read inodes"));
      if (NORM_FIRSTZONE != FIRSTZONE) {
            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=%ld (%ld)\n"),FIRSTZONE,NORM_FIRSTZONE);
            printf(_("Zonesize=%d\n"),BLOCK_SIZE<<ZONESIZE);
            printf(_("Maxsize=%ld\n"),MAXSIZE);
            printf(_("Filesystem state=%d\n"), Super.s_state);
            printf(_("namelen=%d\n\n"),namelen);
      }
}

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

      if (!nr || nr > INODES)
            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 > INODES)
            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 result;
      int block;

      result = 0;
      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 result;
      int block;

      result = 0;
      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[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 < (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[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 < 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[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 < (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[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 < 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[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 < 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 > INODES)
            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 > INODES)
            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[BLOCK_SIZE];
      struct minix_inode * inode;
      int ino;
      char * name;
      int block;

      block = map_block(dir,offset/BLOCK_SIZE);
      read_block(block, blk);
      name = blk + (offset % BLOCK_SIZE) + 2;
      ino = * (unsigned short *) (name-2);
      if (ino > INODES) {
            get_current_name();
            printf(_("The directory '%s' contains a bad inode number "
                   "for file '%.*s'."),
                   current_name, namelen, name);
            if (ask(_(" Remove"),1)) {
                  *(unsigned short *)(name-2) = 0;
                  write_block(block, blk);
            }
            ino = 0;
      }     
      if (name_depth < MAX_DEPTH)
            strncpy (name_list[name_depth], name, namelen);
      name_depth++;
      inode = get_inode(ino);
      name_depth--;
      if (!offset) {
            if (!inode || strcmp(".",name)) {
                  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)) {
                  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)
            strncpy(name_list[name_depth], name, namelen);
      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--;
      return;
}

static void
check_file2 (struct minix2_inode *dir, unsigned int offset) {
      static char blk[BLOCK_SIZE];
      struct minix2_inode *inode;
      int ino;
      char *name;
      int block;

      block = map_block2 (dir, offset / BLOCK_SIZE);
      read_block (block, blk);
      name = blk + (offset % BLOCK_SIZE) + 2;
      ino = *(unsigned short *) (name - 2);
      if (ino > INODES) {
            get_current_name();
            printf(_("The directory '%s' contains a bad inode number "
                   "for file '%.*s'."),
                    current_name, namelen, name);
            if (ask (_(" Remove"), 1)) {
                  *(unsigned short *) (name - 2) = 0;
                  write_block (block, blk);
            }
            ino = 0;
      }
      if (name_depth < MAX_DEPTH)
            strncpy (name_list[name_depth], name, namelen);
      name_depth++;
      inode = get_inode2 (ino);
      name_depth--;
      if (!offset) {
            if (!inode || strcmp (".", name)) {
                  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)) {
                  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 ("%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_zones2 (ino);
      if (inode && S_ISDIR (inode->i_mode))
            recursive_check2 (ino);
      name_depth--;
      return;
}

static void
recursive_check(unsigned int ino) {
      struct minix_inode * dir;
      unsigned int 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;
      }
      for (offset = 0 ; offset < dir->i_size ; offset += dirsize)
            check_file(dir,offset);
}

static void
recursive_check2 (unsigned int ino) {
      struct minix2_inode *dir;
      unsigned int 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 (BLOCK_SIZE*i != lseek(IN, BLOCK_SIZE*i, SEEK_SET))
            die(_("seek failed in bad_zone"));
      return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE));
}

static void
check_counts(void) {
      int i;

      for (i=1 ; i <= INODES ; i++) {
            if (!inode_in_use(i) && Inode[i].i_mode && warn_mode) {
                  printf(_("Inode %d 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 %d not used, marked used in the bitmap."),i);
                  if (ask(_("Clear"),1))
                        unmark_inode(i);
                  continue;
            }
            if (!inode_in_use(i)) {
                  printf(_("Inode %d used, marked unused in the bitmap."),
                        i);
                  if (ask("Set",1))
                        mark_inode(i);
            }
            if (Inode[i].i_nlinks != inode_count[i]) {
                  printf(_("Inode %d (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=FIRSTZONE ; i < ZONES ; i++) {
            if (zone_in_use(i) == zone_count[i])
                  continue;
            if (!zone_count[i]) {
                  if (bad_zone(i))
                        continue;
                  printf(_("Zone %d: marked in use, no file uses it."),i);
                  if (ask(_("Unmark"),1))
                        unmark_zone(i);
                  continue;
            }
            if (zone_in_use(i))
                  printf(_("Zone %d: in use, counted=%d\n"),
                         i, zone_count[i]);
            else
                  printf(_("Zone %d: not in use, counted=%d\n"),
                         i, zone_count[i]);
      }
}

static void
check_counts2 (void) {
      int i;

      for (i = 1; i <= INODES; i++) {
            if (!inode_in_use (i) && Inode2[i].i_mode && warn_mode) {
                  printf (_("Inode %d 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 %d not used, marked used in the bitmap."), i);
                  if (ask (_("Clear"), 1))
                        unmark_inode (i);
                  continue;
            }
            if (!inode_in_use (i)) {
                  printf (_("Inode %d used, marked unused in the bitmap."), i);
                  if (ask (_("Set"), 1))
                        mark_inode (i);
            }
            if (Inode2[i].i_nlinks != inode_count[i]) {
                  printf (_("Inode %d (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 = FIRSTZONE; i < ZONES; i++) {
            if (zone_in_use (i) == zone_count[i])
                  continue;
            if (!zone_count[i]) {
                  if (bad_zone (i))
                        continue;
                  printf (_("Zone %d: marked in use, no file uses it."),
                        i);
                  if (ask (_("Unmark"), 1))
                        unmark_zone (i);
                  continue;
            }
            if (zone_in_use (i))
                  printf (_("Zone %d: in use, counted=%d\n"),
                        i, zone_count[i]);
            else
                  printf (_("Zone %d: not in use, counted=%d\n"),
                        i, zone_count[i]);
      }
}

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

static void
check2 (void) {
      memset (inode_count, 0, (INODES + 1) * sizeof (*inode_count));
      memset (zone_count, 0, ZONES * 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 = 0;
      char *p;

      program_name = (argc && *argv) ? argv[0] : "fsck.minix";
      if ((p = strrchr(program_name, '/')) != NULL)
            program_name = p+1;

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

      if (argc == 2 &&
          (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version"))) {
            printf(_("%s from %s\n"), program_name, util_linux_version);
            exit(0);
      }

      if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE)
            die(_("bad inode size"));
      if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
            die(_("bad v2 inode size"));

      while (argc-- > 1) {
            argv++;
            if (argv[0][0] != '-') {
                  if (device_name)
                        usage();
                  else
                        device_name = argv[0];
            } else while (*++argv[0])
                  switch (argv[0][0]) {
                        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;
                        default: usage();
                  }
      }
      if (!device_name)
            usage();
      check_mount();          /* trying to check a mounted filesystem? */
      if (repair && !automatic) {
            if (!isatty(0) || !isatty(1))
                  die(_("need terminal for interactive repairs"));
      }
      IN = open(device_name,repair?O_RDWR:O_RDONLY);
      if (IN < 0)
            die(_("unable to open '%s'"));
      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 ( !(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;
      }
      else 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();

      if (repair && !automatic) {
            tcgetattr(0,&termios);
            tmp = termios;
            tmp.c_lflag &= ~(ICANON|ECHO);
            tcsetattr(0,TCSANOW,&tmp);
            termios_set = 1;
      }

      if (version2) {
            check_root2 ();
            check2 ();
      } else {
            check_root();
            check();
      }
      if (verbose) {
            int i, free;

            for (i=1,free=0 ; i <= INODES ; i++)
                  if (!inode_in_use(i))
                        free++;
            printf(_("\n%6ld inodes used (%ld%%)\n"),(INODES-free),
                  100*(INODES-free)/INODES);
            for (i=FIRSTZONE,free=0 ; i < ZONES ; i++)
                  if (!zone_in_use(i))
                        free++;
            printf(_("%6ld zones used (%ld%%)\n"),(ZONES-free),
                  100*(ZONES-free)/ZONES);
            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(0,TCSANOW,&termios);

      if (changed)
            retcode += 3;
      if (errors_uncorrected)
            retcode += 4;
      return retcode;
}

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