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Sourcecode: e2fsprogs version File versions

unix.c

/*
 * unix.c - The unix-specific code for e2fsck
 * 
 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <time.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
extern char *optarg;
extern int optind;
#endif
#include <unistd.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif

#include "et/com_err.h"
#include "e2fsck.h"
#include "problem.h"
#include "../version.h"

/* Command line options */
static int swapfs;
static int normalize_swapfs;
static int cflag;       /* check disk */
static int show_version_only;
static int verbose;

static int replace_bad_blocks;
static int keep_bad_blocks;
static char *bad_blocks_file;

e2fsck_t e2fsck_global_ctx;   /* Try your very best not to use this! */

#ifdef CONFIG_JBD_DEBUG       /* Enabled by configure --enable-jfs-debug */
int journal_enable_debug = -1;
#endif

static void usage(e2fsck_t ctx)
{
      fprintf(stderr,
            _("Usage: %s [-panyrcdfvstDFSV] [-b superblock] [-B blocksize]\n"
            "\t\t[-I inode_buffer_blocks] [-P process_inode_size]\n"
            "\t\t[-l|-L bad_blocks_file] [-C fd] [-j ext-journal]\n"
            "\t\t[-E extended-options] device\n"),
            ctx->program_name);

      fprintf(stderr, _("\nEmergency help:\n"
            " -p                   Automatic repair (no questions)\n"
            " -n                   Make no changes to the filesystem\n"
            " -y                   Assume \"yes\" to all questions\n"
            " -c                   Check for bad blocks and add them to the badblock list\n"
            " -f                   Force checking even if filesystem is marked clean\n"));
      fprintf(stderr, _(""
            " -v                   Be verbose\n"
            " -b superblock        Use alternative superblock\n"
            " -B blocksize         Force blocksize when looking for superblock\n"
            " -j external-journal  Set location of the external journal\n"
            " -l bad_blocks_file   Add to badblocks list\n"
            " -L bad_blocks_file   Set badblocks list\n"
            ));

      exit(FSCK_USAGE);
}

static void show_stats(e2fsck_t     ctx)
{
      ext2_filsys fs = ctx->fs;
      int inodes, inodes_used, blocks, blocks_used;
      int dir_links;
      int num_files, num_links;
      int frag_percent;

      dir_links = 2 * ctx->fs_directory_count - 1;
      num_files = ctx->fs_total_count - dir_links;
      num_links = ctx->fs_links_count - dir_links;
      inodes = fs->super->s_inodes_count;
      inodes_used = (fs->super->s_inodes_count -
                   fs->super->s_free_inodes_count);
      blocks = fs->super->s_blocks_count;
      blocks_used = (fs->super->s_blocks_count -
                   fs->super->s_free_blocks_count);

      frag_percent = (10000 * ctx->fs_fragmented) / inodes_used;
      frag_percent = (frag_percent + 5) / 10;
      
      if (!verbose) {
            printf(_("%s: %d/%d files (%0d.%d%% non-contiguous), %d/%d blocks\n"),
                   ctx->device_name, inodes_used, inodes,
                   frag_percent / 10, frag_percent % 10,
                   blocks_used, blocks);
            return;
      }
      printf (P_("\n%8d inode used (%d%%)\n", "\n%8d inodes used (%d%%)\n",
               inodes_used), inodes_used, 100 * inodes_used / inodes);
      printf (P_("%8d non-contiguous inode (%0d.%d%%)\n",
               "%8d non-contiguous inodes (%0d.%d%%)\n",
               ctx->fs_fragmented),
            ctx->fs_fragmented, frag_percent / 10, frag_percent % 10);
      printf (_("         # of inodes with ind/dind/tind blocks: %d/%d/%d\n"),
            ctx->fs_ind_count, ctx->fs_dind_count, ctx->fs_tind_count);
      printf (P_("%8d block used (%d%%)\n", "%8d blocks used (%d%%)\n",
               blocks_used),
            blocks_used, (int) ((long long) 100 * blocks_used / blocks));
      printf (P_("%8d bad block\n", "%8d bad blocks\n",
               ctx->fs_badblocks_count), ctx->fs_badblocks_count);
      printf (P_("%8d large file\n", "%8d large files\n",
               ctx->large_files), ctx->large_files);
      printf (P_("\n%8d regular file\n", "\n%8d regular files\n",
               ctx->fs_regular_count), ctx->fs_regular_count);
      printf (P_("%8d directory\n", "%8d directories\n",
               ctx->fs_directory_count), ctx->fs_directory_count);
      printf (P_("%8d character device file\n",
               "%8d character device files\n", ctx->fs_chardev_count),
            ctx->fs_chardev_count);
      printf (P_("%8d block device file\n", "%8d block device files\n",
               ctx->fs_blockdev_count), ctx->fs_blockdev_count);
      printf (P_("%8d fifo\n", "%8d fifos\n", ctx->fs_fifo_count),
            ctx->fs_fifo_count);
      printf (P_("%8d link\n", "%8d links\n",
               ctx->fs_links_count - dir_links),
            ctx->fs_links_count - dir_links);
      printf (P_("%8d symbolic link", "%8d symbolic links",
               ctx->fs_symlinks_count), ctx->fs_symlinks_count);
      printf (P_(" (%d fast symbolic link)\n", " (%d fast symbolic links)\n",
               ctx->fs_fast_symlinks_count), ctx->fs_fast_symlinks_count);
      printf (P_("%8d socket\n", "%8d sockets\n", ctx->fs_sockets_count),
            ctx->fs_sockets_count);
      printf ("--------\n");
      printf (P_("%8d file\n", "%8d files\n",
               ctx->fs_total_count - dir_links),
            ctx->fs_total_count - dir_links);
}

static void check_mount(e2fsck_t ctx)
{
      errcode_t   retval;
      int         cont;

      retval = ext2fs_check_if_mounted(ctx->filesystem_name,
                               &ctx->mount_flags);
      if (retval) {
            com_err("ext2fs_check_if_mount", retval,
                  _("while determining whether %s is mounted."),
                  ctx->filesystem_name);
            return;
      }

      /*
       * If the filesystem isn't mounted, or it's the root filesystem
       * and it's mounted read-only, then everything's fine.
       */
      if ((!(ctx->mount_flags & EXT2_MF_MOUNTED)) ||
          ((ctx->mount_flags & EXT2_MF_ISROOT) &&
           (ctx->mount_flags & EXT2_MF_READONLY)))
            return;

      if (ctx->options & E2F_OPT_READONLY) {
            printf(_("Warning!  %s is mounted.\n"), ctx->filesystem_name);
            return;
      }

      printf(_("%s is mounted.  "), ctx->filesystem_name);
      if (!ctx->interactive)
            fatal_error(ctx, _("Cannot continue, aborting.\n\n"));
      printf(_("\n\n\007\007\007\007WARNING!!!  "
             "Running e2fsck on a mounted filesystem may cause\n"
             "SEVERE filesystem damage.\007\007\007\n\n"));
      cont = ask_yn(_("Do you really want to continue"), -1);
      if (!cont) {
            printf (_("check aborted.\n"));
            exit (0);
      }
      return;
}

static int is_on_batt(void)
{
      FILE  *f;
      DIR   *d;
      char  tmp[80], tmp2[80], fname[80];
      unsigned int      acflag;
      struct dirent*    de;

      f = fopen("/proc/apm", "r");
      if (f) {
            if (fscanf(f, "%s %s %s %x", tmp, tmp, tmp, &acflag) != 4) 
                  acflag = 1;
            fclose(f);
            return (acflag != 1);
      }
      d = opendir("/proc/acpi/ac_adapter");
      if (d) {
            while ((de=readdir(d)) != NULL) {
                  if (!strncmp(".", de->d_name, 1))
                        continue;
                  snprintf(fname, 80, "/proc/acpi/ac_adapter/%s/state", 
                         de->d_name);
                  f = fopen(fname, "r");
                  if (!f)
                        continue;
                  if (fscanf(f, "%s %s", tmp2, tmp) != 2)
                        tmp[0] = 0;
                  fclose(f);
                  if (strncmp(tmp, "off-line", 8) == 0) {
                        closedir(d);
                        return 1;
                  }
            }
            closedir(d);
      }
      return 0;
}

/*
 * This routine checks to see if a filesystem can be skipped; if so,
 * it will exit with E2FSCK_OK.  Under some conditions it will print a
 * message explaining why a check is being forced.
 */
static void check_if_skip(e2fsck_t ctx)
{
      ext2_filsys fs = ctx->fs;
      const char *reason = NULL;
      unsigned int reason_arg = 0;
      long next_check;
      int batt = is_on_batt();
      time_t now = time(0);
      
      if ((ctx->options & E2F_OPT_FORCE) || bad_blocks_file ||
          cflag || swapfs)
            return;
      
      if ((fs->super->s_state & EXT2_ERROR_FS) ||
          !ext2fs_test_valid(fs))
            reason = _(" contains a file system with errors");
      else if ((fs->super->s_state & EXT2_VALID_FS) == 0)
            reason = _(" was not cleanly unmounted");
      else if ((fs->super->s_max_mnt_count > 0) &&
             (fs->super->s_mnt_count >=
              (unsigned) fs->super->s_max_mnt_count)) {
            reason = _(" has been mounted %u times without being checked");
            reason_arg = fs->super->s_mnt_count;
            if (batt && (fs->super->s_mnt_count < 
                       (unsigned) fs->super->s_max_mnt_count*2))
                  reason = 0;
      } else if (fs->super->s_checkinterval &&
               ((now - fs->super->s_lastcheck) >= 
                fs->super->s_checkinterval)) {
            reason = _(" has gone %u days without being checked");
            reason_arg = (now - fs->super->s_lastcheck)/(3600*24);
            if (batt && ((now - fs->super->s_lastcheck) < 
                       fs->super->s_checkinterval*2))
                  reason = 0;
      }
      if (reason) {
            fputs(ctx->device_name, stdout);
            printf(reason, reason_arg);
            fputs(_(", check forced.\n"), stdout);
            return;
      }
      printf(_("%s: clean, %d/%d files, %d/%d blocks"), ctx->device_name,
             fs->super->s_inodes_count - fs->super->s_free_inodes_count,
             fs->super->s_inodes_count,
             fs->super->s_blocks_count - fs->super->s_free_blocks_count,
             fs->super->s_blocks_count);
      next_check = 100000;
      if (fs->super->s_max_mnt_count > 0) {
            next_check = fs->super->s_max_mnt_count - fs->super->s_mnt_count;
            if (next_check <= 0) 
                  next_check = 1;
      }
      if (fs->super->s_checkinterval &&
          ((now - fs->super->s_lastcheck) >= fs->super->s_checkinterval))
            next_check = 1;
      if (next_check <= 5) {
            if (next_check == 1)
                  fputs(_(" (check after next mount)"), stdout);
            else
                  printf(_(" (check in %ld mounts)"), next_check);
      }
      fputc('\n', stdout);
      ext2fs_close(fs);
      ctx->fs = NULL;
      e2fsck_free_context(ctx);
      exit(FSCK_OK);
}

/*
 * For completion notice
 */
struct percent_tbl {
      int   max_pass;
      int   table[32];
};
struct percent_tbl e2fsck_tbl = {
      5, { 0, 70, 90, 92,  95, 100 }
};
static char bar[128], spaces[128];

static float calc_percent(struct percent_tbl *tbl, int pass, int curr,
                    int max)
{
      float percent;
      
      if (pass <= 0)
            return 0.0;
      if (pass > tbl->max_pass || max == 0)
            return 100.0;
      percent = ((float) curr) / ((float) max);
      return ((percent * (tbl->table[pass] - tbl->table[pass-1]))
            + tbl->table[pass-1]);
}

extern void e2fsck_clear_progbar(e2fsck_t ctx)
{
      if (!(ctx->flags & E2F_FLAG_PROG_BAR))
            return;
      
      printf("%s%s\r%s", ctx->start_meta, spaces + (sizeof(spaces) - 80),
             ctx->stop_meta);
      fflush(stdout);
      ctx->flags &= ~E2F_FLAG_PROG_BAR;
}

int e2fsck_simple_progress(e2fsck_t ctx, const char *label, float percent,
                     unsigned int dpynum)
{
      static const char spinner[] = "\\|/-";
      int   i;
      unsigned int      tick;
      struct timeval    tv;
      int dpywidth;
      int fixed_percent;

      if (ctx->flags & E2F_FLAG_PROG_SUPPRESS)
            return 0;

      /*
       * Calculate the new progress position.  If the
       * percentage hasn't changed, then we skip out right
       * away. 
       */
      fixed_percent = (int) ((10 * percent) + 0.5);
      if (ctx->progress_last_percent == fixed_percent)
            return 0;
      ctx->progress_last_percent = fixed_percent;

      /*
       * If we've already updated the spinner once within
       * the last 1/8th of a second, no point doing it
       * again.
       */
      gettimeofday(&tv, NULL);
      tick = (tv.tv_sec << 3) + (tv.tv_usec / (1000000 / 8));
      if ((tick == ctx->progress_last_time) &&
          (fixed_percent != 0) && (fixed_percent != 1000))
            return 0;
      ctx->progress_last_time = tick;

      /*
       * Advance the spinner, and note that the progress bar
       * will be on the screen
       */
      ctx->progress_pos = (ctx->progress_pos+1) & 3;
      ctx->flags |= E2F_FLAG_PROG_BAR;

      dpywidth = 66 - strlen(label);
      dpywidth = 8 * (dpywidth / 8);
      if (dpynum)
            dpywidth -= 8;

      i = ((percent * dpywidth) + 50) / 100;
      printf("%s%s: |%s%s", ctx->start_meta, label,
             bar + (sizeof(bar) - (i+1)),
             spaces + (sizeof(spaces) - (dpywidth - i + 1)));
      if (fixed_percent == 1000)
            fputc('|', stdout);
      else
            fputc(spinner[ctx->progress_pos & 3], stdout);
      printf(" %4.1f%%  ", percent);
      if (dpynum)
            printf("%u\r", dpynum);
      else
            fputs(" \r", stdout);
      fputs(ctx->stop_meta, stdout);
      
      if (fixed_percent == 1000)
            e2fsck_clear_progbar(ctx);
      fflush(stdout);

      return 0;
}

static int e2fsck_update_progress(e2fsck_t ctx, int pass,
                          unsigned long cur, unsigned long max)
{
      char buf[80];
      float percent;

      if (pass == 0)
            return 0;
      
      if (ctx->progress_fd) {
            sprintf(buf, "%d %lu %lu\n", pass, cur, max);
            write(ctx->progress_fd, buf, strlen(buf));
      } else {
            percent = calc_percent(&e2fsck_tbl, pass, cur, max);
            e2fsck_simple_progress(ctx, ctx->device_name,
                               percent, 0);
      }
      return 0;
}

#define PATH_SET "PATH=/sbin"

static void reserve_stdio_fds(void)
{
      int   fd;

      while (1) {
            fd = open("/dev/null", O_RDWR);
            if (fd > 2)
                  break;
            if (fd < 0) {
                  fprintf(stderr, _("ERROR: Couldn't open "
                        "/dev/null (%s)\n"),
                        strerror(errno));
                  break;
            }
      }
      close(fd);
}

#ifdef HAVE_SIGNAL_H
static void signal_progress_on(int sig EXT2FS_ATTR((unused)))
{
      e2fsck_t ctx = e2fsck_global_ctx;

      if (!ctx)
            return;

      ctx->progress = e2fsck_update_progress;
      ctx->progress_fd = 0;
}

static void signal_progress_off(int sig EXT2FS_ATTR((unused)))
{
      e2fsck_t ctx = e2fsck_global_ctx;

      if (!ctx)
            return;

      e2fsck_clear_progbar(ctx);
      ctx->progress = 0;
}

static void signal_cancel(int sig EXT2FS_ATTR((unused)))
{
      e2fsck_t ctx = e2fsck_global_ctx;

      if (!ctx)
            exit(FSCK_CANCELED);

      ctx->flags |= E2F_FLAG_CANCEL;
}
#endif

static void parse_extended_opts(e2fsck_t ctx, const char *opts)
{
      char  *buf, *token, *next, *p, *arg;
      int   ea_ver;
      int   extended_usage = 0;

      buf = string_copy(ctx, opts, 0);
      for (token = buf; token && *token; token = next) {
            p = strchr(token, ',');
            next = 0;
            if (p) {
                  *p = 0;
                  next = p+1;
            } 
            arg = strchr(token, '=');
            if (arg) {
                  *arg = 0;
                  arg++;
            }
            if (strcmp(token, "ea_ver") == 0) {
                  if (!arg) {
                        extended_usage++;
                        continue;
                  }
                  ea_ver = strtoul(arg, &p, 0);
                  if (*p ||
                      ((ea_ver != 1) && (ea_ver != 2))) {
                        fprintf(stderr,
                              _("Invalid EA version.\n"));
                        extended_usage++;
                        continue;
                  }
                  ctx->ext_attr_ver = ea_ver;
            } else
                  extended_usage++;
      }
      if (extended_usage) {
            fprintf(stderr, _("Extended options are separated by commas, "
                  "and may take an argument which\n"
                  "is set off by an equals ('=') sign.  "
                  "Valid raid options are:\n"
                  "\tea_ver=<ea_version (1 or 2)\n\n"));
            exit(1);
      }
}     


static errcode_t PRS(int argc, char *argv[], e2fsck_t *ret_ctx)
{
      int         flush = 0;
      int         c, fd;
#ifdef MTRACE
      extern void *mallwatch;
#endif
      e2fsck_t    ctx;
      errcode_t   retval;
#ifdef HAVE_SIGNAL_H
      struct sigaction  sa;
#endif
      char        *extended_opts = 0;

      retval = e2fsck_allocate_context(&ctx);
      if (retval)
            return retval;

      *ret_ctx = ctx;

      setvbuf(stdout, NULL, _IONBF, BUFSIZ);
      setvbuf(stderr, NULL, _IONBF, BUFSIZ);
      if (isatty(0) && isatty(1)) {
            ctx->interactive = 1;
      } else {
            ctx->start_meta[0] = '\001';
            ctx->stop_meta[0] = '\002';
      }
      memset(bar, '=', sizeof(bar)-1);
      memset(spaces, ' ', sizeof(spaces)-1);
      initialize_ext2_error_table();
      blkid_get_cache(&ctx->blkid, NULL);
      
      if (argc && *argv)
            ctx->program_name = *argv;
      else
            ctx->program_name = "e2fsck";
      while ((c = getopt (argc, argv, "panyrcC:B:dE:fvtFVM:b:I:j:P:l:L:N:SsDk")) != EOF)
            switch (c) {
            case 'C':
                  ctx->progress = e2fsck_update_progress;
                  ctx->progress_fd = atoi(optarg);
                  if (!ctx->progress_fd)
                        break;
                  /* Validate the file descriptor to avoid disasters */
                  fd = dup(ctx->progress_fd);
                  if (fd < 0) {
                        fprintf(stderr,
                        _("Error validating file descriptor %d: %s\n"),
                              ctx->progress_fd,
                              error_message(errno));
                        fatal_error(ctx,
                  _("Invalid completion information file descriptor"));
                  } else
                        close(fd);
                  break;
            case 'D':
                  ctx->options |= E2F_OPT_COMPRESS_DIRS;
                  break;
            case 'E':
                  extended_opts = optarg;
                  break;
            case 'p':
            case 'a':
                  if (ctx->options & (E2F_OPT_YES|E2F_OPT_NO)) {
                  conflict_opt:
                        fatal_error(ctx, 
      _("Only one the options -p/-a, -n or -y may be specified."));
                  }
                  ctx->options |= E2F_OPT_PREEN;
                  break;
            case 'n':
                  if (ctx->options & (E2F_OPT_YES|E2F_OPT_PREEN))
                        goto conflict_opt;
                  ctx->options |= E2F_OPT_NO;
                  break;
            case 'y':
                  if (ctx->options & (E2F_OPT_PREEN|E2F_OPT_NO))
                        goto conflict_opt;
                  ctx->options |= E2F_OPT_YES;
                  break;
            case 't':
#ifdef RESOURCE_TRACK
                  if (ctx->options & E2F_OPT_TIME)
                        ctx->options |= E2F_OPT_TIME2;
                  else
                        ctx->options |= E2F_OPT_TIME;
#else
                  fprintf(stderr, _("The -t option is not "
                        "supported on this version of e2fsck.\n"));
#endif
                  break;
            case 'c':
                  if (cflag++)
                        ctx->options |= E2F_OPT_WRITECHECK;
                  ctx->options |= E2F_OPT_CHECKBLOCKS;
                  break;
            case 'r':
                  /* What we do by default, anyway! */
                  break;
            case 'b':
                  ctx->use_superblock = atoi(optarg);
                  ctx->flags |= E2F_FLAG_SB_SPECIFIED;
                  break;
            case 'B':
                  ctx->blocksize = atoi(optarg);
                  break;
            case 'I':
                  ctx->inode_buffer_blocks = atoi(optarg);
                  break;
            case 'j':
                  ctx->journal_name = string_copy(ctx, optarg, 0);
                  break;
            case 'P':
                  ctx->process_inode_size = atoi(optarg);
                  break;
            case 'L':
                  replace_bad_blocks++;
            case 'l':
                  bad_blocks_file = string_copy(ctx, optarg, 0);
                  break;
            case 'd':
                  ctx->options |= E2F_OPT_DEBUG;
                  break;
            case 'f':
                  ctx->options |= E2F_OPT_FORCE;
                  break;
            case 'F':
                  flush = 1;
                  break;
            case 'v':
                  verbose = 1;
                  break;
            case 'V':
                  show_version_only = 1;
                  break;
#ifdef MTRACE
            case 'M':
                  mallwatch = (void *) strtol(optarg, NULL, 0);
                  break;
#endif
            case 'N':
                  ctx->device_name = optarg;
                  break;
#ifdef ENABLE_SWAPFS
            case 's':
                  normalize_swapfs = 1;
            case 'S':
                  swapfs = 1;
                  break;
#else
            case 's':
            case 'S':
                  fprintf(stderr, _("Byte-swapping filesystems "
                                "not compiled in this version "
                                "of e2fsck\n"));
                  exit(1);
#endif
            case 'k':
                  keep_bad_blocks++;
                  break;
            default:
                  usage(ctx);
            }
      if (show_version_only)
            return 0;
      if (optind != argc - 1)
            usage(ctx);
      if ((ctx->options & E2F_OPT_NO) && !bad_blocks_file &&
          !cflag && !swapfs && !(ctx->options & E2F_OPT_COMPRESS_DIRS))
            ctx->options |= E2F_OPT_READONLY;
      ctx->io_options = strchr(argv[optind], '?');
      if (ctx->io_options) 
            *ctx->io_options++ = 0;
      ctx->filesystem_name = blkid_get_devname(ctx->blkid, argv[optind], 0);
      if (!ctx->filesystem_name) {
            com_err(ctx->program_name, 0, _("Unable to resolve '%s'"), 
                  argv[optind]);
            fatal_error(ctx, 0);
      }
      if (extended_opts)
            parse_extended_opts(ctx, extended_opts);
      
      if (flush) {
            fd = open(ctx->filesystem_name, O_RDONLY, 0);
            if (fd < 0) {
                  com_err("open", errno,
                        _("while opening %s for flushing"),
                        ctx->filesystem_name);
                  fatal_error(ctx, 0);
            }
            if ((retval = ext2fs_sync_device(fd, 1))) {
                  com_err("ext2fs_sync_device", retval,
                        _("while trying to flush %s"),
                        ctx->filesystem_name);
                  fatal_error(ctx, 0);
            }
            close(fd);
      }
#ifdef ENABLE_SWAPFS
      if (swapfs) {
            if (cflag || bad_blocks_file) {
                  fprintf(stderr, _("Incompatible options not "
                                "allowed when byte-swapping.\n"));
                  exit(FSCK_USAGE);
            }
      }
#endif
      if (cflag && bad_blocks_file) {
            fprintf(stderr, _("The -c and the -l/-L options may "
                          "not be both used at the same time.\n"));
            exit(FSCK_USAGE);
      }
#ifdef HAVE_SIGNAL_H
      /*
       * Set up signal action
       */
      memset(&sa, 0, sizeof(struct sigaction));
      sa.sa_handler = signal_cancel;
      sigaction(SIGINT, &sa, 0);
      sigaction(SIGTERM, &sa, 0);
#ifdef SA_RESTART
      sa.sa_flags = SA_RESTART;
#endif
      e2fsck_global_ctx = ctx;
      sa.sa_handler = signal_progress_on;
      sigaction(SIGUSR1, &sa, 0);
      sa.sa_handler = signal_progress_off;
      sigaction(SIGUSR2, &sa, 0);
#endif

      /* Update our PATH to include /sbin if we need to run badblocks  */
      if (cflag) {
            char *oldpath = getenv("PATH");
            if (oldpath) {
                  char *newpath;

                  newpath = (char *) malloc(sizeof (PATH_SET) + 1 +
                                      strlen (oldpath));
                  if (!newpath)
                        fatal_error(ctx, "Couldn't malloc() newpath");
                  strcpy (newpath, PATH_SET);
                  strcat (newpath, ":");
                  strcat (newpath, oldpath);
                  putenv (newpath);
            } else
                  putenv (PATH_SET);
      }
#ifdef CONFIG_JBD_DEBUG
      if (getenv("E2FSCK_JBD_DEBUG"))
            journal_enable_debug = atoi(getenv("E2FSCK_JBD_DEBUG"));
#endif
      return 0;
}

static const char *my_ver_string = E2FSPROGS_VERSION;
static const char *my_ver_date = E2FSPROGS_DATE;
                              
int main (int argc, char *argv[])
{
      errcode_t   retval = 0;
      int         exit_value = FSCK_OK;
      ext2_filsys fs = 0;
      io_manager  io_ptr;
      struct ext2_super_block *sb;
      const char  *lib_ver_date;
      int         my_ver, lib_ver;
      e2fsck_t    ctx;
      struct problem_context pctx;
      int flags, run_result;
      
      clear_problem_context(&pctx);
#ifdef MTRACE
      mtrace();
#endif
#ifdef MCHECK
      mcheck(0);
#endif
#ifdef ENABLE_NLS
      setlocale(LC_MESSAGES, "");
      setlocale(LC_CTYPE, "");
      bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
      textdomain(NLS_CAT_NAME);
#endif
      my_ver = ext2fs_parse_version_string(my_ver_string);
      lib_ver = ext2fs_get_library_version(0, &lib_ver_date);
      if (my_ver > lib_ver) {
            fprintf( stderr, _("Error: ext2fs library version "
                  "out of date!\n"));
            show_version_only++;
      }
      
      retval = PRS(argc, argv, &ctx);
      if (retval) {
            com_err("e2fsck", retval,
                  _("while trying to initialize program"));
            exit(FSCK_ERROR);
      }
      reserve_stdio_fds();
      
#ifdef RESOURCE_TRACK
      init_resource_track(&ctx->global_rtrack);
#endif

      if (!(ctx->options & E2F_OPT_PREEN) || show_version_only)
            fprintf(stderr, "e2fsck %s (%s)\n", my_ver_string,
                   my_ver_date);

      if (show_version_only) {
            fprintf(stderr, _("\tUsing %s, %s\n"),
                  error_message(EXT2_ET_BASE), lib_ver_date);
            exit(FSCK_OK);
      }
      
      check_mount(ctx);
      
      if (!(ctx->options & E2F_OPT_PREEN) &&
          !(ctx->options & E2F_OPT_NO) &&
          !(ctx->options & E2F_OPT_YES)) {
            if (!ctx->interactive)
                  fatal_error(ctx,
                            _("need terminal for interactive repairs"));
      }
      ctx->superblock = ctx->use_superblock;
restart:
#ifdef CONFIG_TESTIO_DEBUG
      io_ptr = test_io_manager;
      test_io_backing_manager = unix_io_manager;
#else
      io_ptr = unix_io_manager;
#endif
      flags = 0;
      if ((ctx->options & E2F_OPT_READONLY) == 0)
            flags |= EXT2_FLAG_RW;

      if (ctx->superblock && ctx->blocksize) {
            retval = ext2fs_open2(ctx->filesystem_name, ctx->io_options, 
                              flags, ctx->superblock, ctx->blocksize,
                              io_ptr, &fs);
      } else if (ctx->superblock) {
            int blocksize;
            for (blocksize = EXT2_MIN_BLOCK_SIZE;
                 blocksize <= EXT2_MAX_BLOCK_SIZE; blocksize *= 2) {
                  retval = ext2fs_open2(ctx->filesystem_name, 
                                    ctx->io_options, flags,
                                    ctx->superblock, blocksize,
                                    io_ptr, &fs);
                  if (!retval)
                        break;
            }
      } else 
            retval = ext2fs_open2(ctx->filesystem_name, ctx->io_options, 
                              flags, 0, 0, io_ptr, &fs);
      if (!ctx->superblock && !(ctx->options & E2F_OPT_PREEN) &&
          !(ctx->flags & E2F_FLAG_SB_SPECIFIED) &&
          ((retval == EXT2_ET_BAD_MAGIC) ||
           ((retval == 0) && ext2fs_check_desc(fs)))) {
            if (!fs || (fs->group_desc_count > 1)) {
                  printf(_("%s trying backup blocks...\n"),
                         retval ? _("Couldn't find ext2 superblock,") :
                         _("Group descriptors look bad..."));
                  get_backup_sb(ctx, fs, ctx->filesystem_name, io_ptr);
                  if (fs)
                        ext2fs_close(fs);
                  goto restart;
            }
      }
      if (retval) {
            com_err(ctx->program_name, retval, _("while trying to open %s"),
                  ctx->filesystem_name);
            if (retval == EXT2_ET_REV_TOO_HIGH) {
                  printf(_("The filesystem revision is apparently "
                         "too high for this version of e2fsck.\n"
                         "(Or the filesystem superblock "
                         "is corrupt)\n\n"));
                  fix_problem(ctx, PR_0_SB_CORRUPT, &pctx);
            } else if (retval == EXT2_ET_SHORT_READ)
                  printf(_("Could this be a zero-length partition?\n"));
            else if ((retval == EPERM) || (retval == EACCES))
                  printf(_("You must have %s access to the "
                         "filesystem or be root\n"),
                         (ctx->options & E2F_OPT_READONLY) ?
                         "r/o" : "r/w");
            else if (retval == ENXIO)
                  printf(_("Possibly non-existent or swap device?\n"));
#ifdef EROFS
            else if (retval == EROFS)
                  printf(_("Disk write-protected; use the -n option "
                         "to do a read-only\n"
                         "check of the device.\n"));
#endif
            else
                  fix_problem(ctx, PR_0_SB_CORRUPT, &pctx);
            fatal_error(ctx, 0);
      }
      ctx->fs = fs;
      fs->priv_data = ctx;
      sb = fs->super;
      if (sb->s_rev_level > E2FSCK_CURRENT_REV) {
            com_err(ctx->program_name, EXT2_ET_REV_TOO_HIGH,
                  _("while trying to open %s"),
                  ctx->filesystem_name);
      get_newer:
            fatal_error(ctx, _("Get a newer version of e2fsck!"));
      }

      /*
       * Set the device name, which is used whenever we print error
       * or informational messages to the user.
       */
      if (ctx->device_name == 0 &&
          (sb->s_volume_name[0] != 0)) {
            ctx->device_name = string_copy(ctx, sb->s_volume_name,
                                     sizeof(sb->s_volume_name));
      }
      if (ctx->device_name == 0)
            ctx->device_name = ctx->filesystem_name;

      /*
       * Make sure the ext3 superblock fields are consistent.
       */
      retval = e2fsck_check_ext3_journal(ctx);
      if (retval) {
            com_err(ctx->program_name, retval,
                  _("while checking ext3 journal for %s"),
                  ctx->device_name);
            fatal_error(ctx, 0);
      }

      /*
       * Check to see if we need to do ext3-style recovery.  If so,
       * do it, and then restart the fsck.
       */
      if (sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) {
            if (ctx->options & E2F_OPT_READONLY) {
                  printf(_("Warning: skipping journal recovery "
                         "because doing a read-only filesystem "
                         "check.\n"));
                  io_channel_flush(ctx->fs->io);
            } else {
                  if (ctx->flags & E2F_FLAG_RESTARTED) {
                        /*
                         * Whoops, we attempted to run the
                         * journal twice.  This should never
                         * happen, unless the hardware or
                         * device driver is being bogus.
                         */
                        com_err(ctx->program_name, 0,
                              _("unable to set superblock flags on %s\n"), ctx->device_name);
                        fatal_error(ctx, 0);
                  }
                  retval = e2fsck_run_ext3_journal(ctx);
                  if (retval) {
                        com_err(ctx->program_name, retval,
                        _("while recovering ext3 journal of %s"),
                              ctx->device_name);
                        fatal_error(ctx, 0);
                  }
                  ext2fs_close(ctx->fs);
                  ctx->fs = 0;
                  ctx->flags |= E2F_FLAG_RESTARTED;
                  goto restart;
            }
      }

      /*
       * Check for compatibility with the feature sets.  We need to
       * be more stringent than ext2fs_open().
       */
      if ((sb->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) ||
          (sb->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP)) {
            com_err(ctx->program_name, EXT2_ET_UNSUPP_FEATURE,
                  "(%s)", ctx->device_name);
            goto get_newer;
      }
      if (sb->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
            com_err(ctx->program_name, EXT2_ET_RO_UNSUPP_FEATURE,
                  "(%s)", ctx->device_name);
            goto get_newer;
      }
#ifdef ENABLE_COMPRESSION
      if (sb->s_feature_incompat & EXT2_FEATURE_INCOMPAT_COMPRESSION)
            com_err(ctx->program_name, 0,
                  _("Warning: compression support is experimental.\n"));
#endif
#ifndef ENABLE_HTREE
      if (sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) {
            com_err(ctx->program_name, 0,
                  _("E2fsck not compiled with HTREE support,\n\t"
                    "but filesystem %s has HTREE directories.\n"),
                  ctx->device_name);
            goto get_newer;
      }
#endif

      /*
       * If the user specified a specific superblock, presumably the
       * master superblock has been trashed.  So we mark the
       * superblock as dirty, so it can be written out.
       */
      if (ctx->superblock &&
          !(ctx->options & E2F_OPT_READONLY))
            ext2fs_mark_super_dirty(fs);

      /*
       * We only update the master superblock because (a) paranoia;
       * we don't want to corrupt the backup superblocks, and (b) we
       * don't need to update the mount count and last checked
       * fields in the backup superblock (the kernel doesn't
       * update the backup superblocks anyway).
       */
      fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;

      ehandler_init(fs->io);

      if (ctx->superblock)
            set_latch_flags(PR_LATCH_RELOC, PRL_LATCHED, 0);
      ext2fs_mark_valid(fs);
      check_super_block(ctx);
      if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
            fatal_error(ctx, 0);
      check_if_skip(ctx);
      if (bad_blocks_file)
            read_bad_blocks_file(ctx, bad_blocks_file, replace_bad_blocks);
      else if (cflag)
            read_bad_blocks_file(ctx, 0, !keep_bad_blocks); /* Test disk */
      if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
            fatal_error(ctx, 0);
#ifdef ENABLE_SWAPFS
      if (normalize_swapfs) {
            if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ==
                ext2fs_native_flag()) {
                  fprintf(stderr, _("%s: Filesystem byte order "
                        "already normalized.\n"), ctx->device_name);
                  fatal_error(ctx, 0);
            }
      }
      if (swapfs) {
            swap_filesys(ctx);
            if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
                  fatal_error(ctx, 0);
      }
#endif

      /*
       * Mark the system as valid, 'til proven otherwise
       */
      ext2fs_mark_valid(fs);

      retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
      if (retval) {
            com_err(ctx->program_name, retval,
                  _("while reading bad blocks inode"));
            preenhalt(ctx);
            printf(_("This doesn't bode well,"
                   " but we'll try to go on...\n"));
      }

      run_result = e2fsck_run(ctx);
      e2fsck_clear_progbar(ctx);
      if (run_result == E2F_FLAG_RESTART) {
            printf(_("Restarting e2fsck from the beginning...\n"));
            retval = e2fsck_reset_context(ctx);
            if (retval) {
                  com_err(ctx->program_name, retval,
                        _("while resetting context"));
                  fatal_error(ctx, 0);
            }
            ext2fs_close(fs);
            goto restart;
      }
      if (run_result & E2F_FLAG_CANCEL) {
            printf(_("%s: e2fsck canceled.\n"), ctx->device_name ?
                   ctx->device_name : ctx->filesystem_name);
            exit_value |= FSCK_CANCELED;
      }
      if (run_result & E2F_FLAG_ABORT)
            fatal_error(ctx, _("aborted"));

#ifdef MTRACE
      mtrace_print("Cleanup");
#endif
      if (ext2fs_test_changed(fs)) {
            exit_value |= FSCK_NONDESTRUCT;
            if (!(ctx->options & E2F_OPT_PREEN))
                printf(_("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n"),
                         ctx->device_name);
            if (ctx->mount_flags & EXT2_MF_ISROOT) {
                  printf(_("%s: ***** REBOOT LINUX *****\n"),
                         ctx->device_name);
                  exit_value |= FSCK_REBOOT;
            }
      }
      if (!ext2fs_test_valid(fs)) {
            printf(_("\n%s: ********** WARNING: Filesystem still has "
                   "errors **********\n\n"), ctx->device_name);
            exit_value |= FSCK_UNCORRECTED;
            exit_value &= ~FSCK_NONDESTRUCT;
      }
      if (exit_value & FSCK_CANCELED)
            exit_value &= ~FSCK_NONDESTRUCT;
      else {
            show_stats(ctx);
            if (!(ctx->options & E2F_OPT_READONLY)) {
                  if (ext2fs_test_valid(fs)) {
                        if (!(sb->s_state & EXT2_VALID_FS))
                              exit_value |= FSCK_NONDESTRUCT;
                        sb->s_state = EXT2_VALID_FS;
                  } else
                        sb->s_state &= ~EXT2_VALID_FS;
                  sb->s_mnt_count = 0;
                  sb->s_lastcheck = time(NULL);
                  ext2fs_mark_super_dirty(fs);
            }
      }

      e2fsck_write_bitmaps(ctx);
      
      ext2fs_close(fs);
      ctx->fs = NULL;
      free(ctx->filesystem_name);
      free(ctx->journal_name);
      e2fsck_free_context(ctx);
      
#ifdef RESOURCE_TRACK
      if (ctx->options & E2F_OPT_TIME)
            print_resource_track(NULL, &ctx->global_rtrack);
#endif

      return exit_value;
}

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