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fsck.c

/*
 * pfsck --- A generic, parallelizing front-end for the fsck program.
 * It will automatically try to run fsck programs in parallel if the
 * devices are on separate spindles.  It is based on the same ideas as
 * the generic front end for fsck by David Engel and Fred van Kempen,
 * but it has been completely rewritten from scratch to support
 * parallel execution.
 *
 * Written by Theodore Ts'o, <tytso@mit.edu>
 * 
 * Usage:   fsck [-ACVRNTM] [-s] [-t fstype] [fs-options] device
 * 
 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
 *   o Changed -t fstype to behave like with mount when -A (all file
 *     systems) or -M (like mount) is specified.
 *   o fsck looks if it can find the fsck.type program to decide
 *     if it should ignore the fs type. This way more fsck programs
 *     can be added without changing this front-end.
 *   o -R flag skip root file system.
 *
 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <sys/types.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <limits.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_PATHS_H
#include <paths.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <malloc.h>

#include "../version.h"
#include "nls-enable.h"
#include "fsck.h"
#include "get_device_by_label.h"

#ifndef _PATH_MNTTAB
#define     _PATH_MNTTAB      "/etc/fstab"
#endif

static const char *ignored_types[] = {
      "ignore",
      "iso9660",
      "nfs",
      "proc",
      "sw",
      "swap",
      NULL
};

static const char *really_wanted[] = {
      "minix",
      "ext2",
      "ext3",
      "xiafs",
      NULL
};

#define BASE_MD "/dev/md"

/*
 * Global variables for options
 */
char *devices[MAX_DEVICES];
char *args[MAX_ARGS];
int num_devices, num_args;

int verbose = 0;
int doall = 0;
int noexecute = 0;
int serialize = 0;
int skip_root = 0;
int like_mount = 0;
int notitle = 0;
int parallel_root = 0;
int progress = 0;
int force_all_parallel = 0;
int num_running = 0;
int max_running = 0;
char *progname;
char *fstype = NULL;
struct fs_info *filesys_info;
struct fsck_instance *instance_list;
const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
char *fsck_path = 0;
static int ignore(struct fs_info *);

static char *skip_over_blank(char *cp)
{
      while (*cp && isspace(*cp))
            cp++;
      return cp;
}

static char *skip_over_word(char *cp)
{
      while (*cp && !isspace(*cp))
            cp++;
      return cp;
}

static void strip_line(char *line)
{
      char  *p;

      while (*line) {
            p = line + strlen(line) - 1;
            if ((*p == '\n') || (*p == '\r'))
                  *p = 0;
            else
                  break;
      }
}

static char *parse_word(char **buf)
{
      char *word, *next;

      word = *buf;
      if (*word == 0)
            return 0;

      word = skip_over_blank(word);
      next = skip_over_word(word);
      if (*next)
            *next++ = 0;
      *buf = next;
      return word;
}

static void free_instance(struct fsck_instance *i)
{
      if (i->prog)
            free(i->prog);
      if (i->device)
            free(i->device);
      if (i->base_device)
            free(i->base_device);
      free(i);
      return;
}

static int parse_fstab_line(char *line, struct fs_info **ret_fs)
{
      char  *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
      struct fs_info *fs;

      *ret_fs = 0;
      strip_line(line);
      if ((cp = strchr(line, '#')))
            *cp = 0;    /* Ignore everything after the comment char */
      cp = line;

      device = parse_word(&cp);
      mntpnt = parse_word(&cp);
      type = parse_word(&cp);
      opts = parse_word(&cp);
      freq = parse_word(&cp);
      passno = parse_word(&cp);

      if (!device)
            return 0;   /* Allow blank lines */
      
      if (!mntpnt || !type)
            return -1;
      
      if (!(fs = malloc(sizeof(struct fs_info))))
            return -1;

      fs->device = string_copy(device);
      fs->mountpt = string_copy(mntpnt);
      fs->type = string_copy(type);
      fs->opts = string_copy(opts ? opts : "");
      fs->freq = freq ? atoi(freq) : -1;
      fs->passno = passno ? atoi(passno) : -1;
      fs->flags = 0;
      fs->next = NULL;

      *ret_fs = fs;

      return 0;
}

/*
 * Interpret the device name if necessary 
 */
static char *interpret_device(char *spec)
{
      char *dev = interpret_spec(spec);

      if (dev)
            return dev;

      /*
       * Check to see if this was because /proc/partitions isn't
       * found.
       */
      if (access("/proc/partitions", R_OK) < 0) {
            fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
                  strerror(errno));
            fprintf(stderr, "Is /proc mounted?\n");
            exit(EXIT_ERROR);
      }
      /*
       * Check to see if this is because we're not running as root
       */
      if (geteuid())
            fprintf(stderr,
                  "Must be root to scan for matching filesystems: %s\n",
                  spec);
      else
            fprintf(stderr, "Couldn't find matching filesystem: %s\n",
                  spec);
      exit(EXIT_ERROR);
}

/*
 * Interpret filesystem auto type if necessary
 */
static void interpret_type(struct fs_info *fs)
{
      const char  *type;
      
      if (strcmp(fs->type, "auto") == 0 ||
          (strchr(fs->type, ',') != 0)) {
            if (fs && strchr(fs->device, '='))
                  fs->device = interpret_device(fs->device);
            type = identify_fs(fs->device, fs->type);
            if (type) {
                  free(fs->type);
                  fs->type = string_copy(type);
            } else
                  fprintf(stderr, _("Could not determine "
                                "filesystem type for %s\n"),
                        fs->device);
      }
}


/*
 * Load the filesystem database from /etc/fstab
 */
static void load_fs_info(const char *filename)
{
      FILE  *f;
      char  buf[1024];
      int   lineno = 0;
      int   old_fstab = 1;
      struct fs_info *fs, *fs_last = NULL;

      filesys_info = NULL;
      if ((f = fopen(filename, "r")) == NULL) {
            fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
                  filename, strerror(errno));
            return;
      }
      while (!feof(f)) {
            lineno++;
            if (!fgets(buf, sizeof(buf), f))
                  break;
            buf[sizeof(buf)-1] = 0;
            if (parse_fstab_line(buf, &fs) < 0) {
                  fprintf(stderr, _("WARNING: bad format "
                        "on line %d of %s\n"), lineno, filename);
                  continue;
            }
            if (!fs)
                  continue;
            if (!filesys_info)
                  filesys_info = fs;
            else
                  fs_last->next = fs;
            fs_last = fs;
            if (fs->passno < 0)
                  fs->passno = 0;
            else
                  old_fstab = 0;
      }
      
      fclose(f);
      
      if (old_fstab) {
            fprintf(stderr, _("\007\007\007"
            "WARNING: Your /etc/fstab does not contain the fsck passno\n"
            "     field.  I will kludge around things for you, but you\n"
            "     should fix your /etc/fstab file as soon as you can.\n\n"));
            
            for (fs = filesys_info; fs; fs = fs->next) {
                  fs->passno = 1;
            }
      }
}
      
/* Lookup filesys in /etc/fstab and return the corresponding entry. */
static struct fs_info *lookup(char *filesys)
{
      struct fs_info *fs;
      int   try_again = 0;

      /* No filesys name given. */
      if (filesys == NULL)
            return NULL;

      for (fs = filesys_info; fs; fs = fs->next) {
            if (strchr(fs->device, '='))
                  try_again++;
            if (!strcmp(filesys, fs->device) ||
                !strcmp(filesys, fs->mountpt))
                  break;
      }
      if (fs && strchr(fs->device, '='))
            fs->device = interpret_device(fs->device);

      if (fs || !try_again)
            return fs;

      for (fs = filesys_info; fs; fs = fs->next) {
            fs->device = interpret_device(fs->device);
            if (!strcmp(filesys, fs->device) ||
                !strcmp(filesys, fs->mountpt))
                  break;
      }

      return fs;
}

/* Find fsck program for a given fs type. */
static char *find_fsck(char *type)
{
  char *s;
  const char *tpl;
  static char prog[256];
  char *p = string_copy(fsck_path);
  struct stat st;

  /* Are we looking for a program or just a type? */
  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");

  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
      sprintf(prog, tpl, s, type);
      if (stat(prog, &st) == 0) break;
  }
  free(p);
  return(s ? prog : NULL);
}

static int progress_active(NOARGS)
{
      struct fsck_instance *inst;

      for (inst = instance_list; inst; inst = inst->next) {
            if (inst->flags & FLAG_DONE)
                  continue;
            if (inst->flags & FLAG_PROGRESS)
                  return 1;
      }
      return 0;
}

/*
 * Execute a particular fsck program, and link it into the list of
 * child processes we are waiting for.
 */
static int execute(const char *type, char *device, char *mntpt,
               int interactive)
{
      char *s, *argv[80], prog[80];
      int  argc, i;
      struct fsck_instance *inst, *p;
      pid_t pid;

      inst = malloc(sizeof(struct fsck_instance));
      if (!inst)
            return ENOMEM;
      memset(inst, 0, sizeof(struct fsck_instance));

      sprintf(prog, "fsck.%s", type);
      argv[0] = string_copy(prog);
      argc = 1;
      
      for (i=0; i <num_args; i++)
            argv[argc++] = string_copy(args[i]);

      if (progress & !progress_active()) {
            if ((strcmp(type, "ext2") == 0) ||
                (strcmp(type, "ext3") == 0)) {
                  argv[argc++] = string_copy("-C0");
                  inst->flags |= FLAG_PROGRESS;
            }
      }

      argv[argc++] = string_copy(device);
      argv[argc] = 0;

      s = find_fsck(prog);
      if (s == NULL) {
            fprintf(stderr, _("fsck: %s: not found\n"), prog);
            return ENOENT;
      }

      if (verbose || noexecute) {
            printf("[%s (%d) -- %s] ", s, num_running,
                   mntpt ? mntpt : device);
            for (i=0; i < argc; i++)
                  printf("%s ", argv[i]);
            printf("\n");
      }
      
      /* Fork and execute the correct program. */
      if (noexecute)
            pid = -1;
      else if ((pid = fork()) < 0) {
            perror("fork");
            return errno;
      } else if (pid == 0) {
            if (!interactive)
                  close(0);
            (void) execv(s, argv);
            perror(argv[0]);
            exit(EXIT_ERROR);
      }

      for (i=0; i < argc; i++)
            free(argv[i]);
      
      inst->pid = pid;
      inst->prog = string_copy(prog);
      inst->type = string_copy(type);
      inst->device = string_copy(device);
      inst->base_device = base_device(device);
      inst->start_time = time(0);
      inst->next = NULL;

      /*
       * Find the end of the list, so we add the instance on at the end.
       */
      for (p = instance_list; p && p->next; p = p->next);

      if (p)
            p->next = inst;
      else
            instance_list = inst;
      
      return 0;
}

/*
 * Wait for one child process to exit; when it does, unlink it from
 * the list of executing child processes, and return it.
 */
static struct fsck_instance *wait_one(int flags)
{
      int   status;
      int   sig;
      struct fsck_instance *inst, *inst2, *prev;
      pid_t pid;

      if (!instance_list)
            return NULL;

      if (noexecute) {
            inst = instance_list;
            prev = 0;
#ifdef RANDOM_DEBUG
            while (inst->next && (random() & 1)) {
                  prev = inst;
                  inst = inst->next;
            }
#endif
            inst->exit_status = 0;
            goto ret_inst;
      }

      /*
       * gcc -Wall fails saving throw against stupidity
       * (inst and prev are thought to be uninitialized variables)
       */
      inst = prev = NULL;
      
      do {
            pid = waitpid(-1, &status, flags);
            if ((pid == 0) && (flags & WNOHANG))
                  return NULL;
            if (pid < 0) {
                  if ((errno == EINTR) || (errno == EAGAIN))
                        continue;
                  if (errno == ECHILD) {
                        fprintf(stderr,
                              _("%s: wait: No more child process?!?\n"),
                              progname);
                        return NULL;
                  }
                  perror("wait");
                  continue;
            }
            for (prev = 0, inst = instance_list;
                 inst;
                 prev = inst, inst = inst->next) {
                  if (inst->pid == pid)
                        break;
            }
      } while (!inst);

      if (WIFEXITED(status)) 
            status = WEXITSTATUS(status);
      else if (WIFSIGNALED(status)) {
            sig = WTERMSIG(status);
            if (sig == SIGINT) {
                  status = EXIT_UNCORRECTED;
            } else {
                  printf(_("Warning... %s for device %s exited "
                         "with signal %d.\n"),
                         inst->prog, inst->device, sig);
                  status = EXIT_ERROR;
            }
      } else {
            printf(_("%s %s: status is %x, should never happen.\n"),
                   inst->prog, inst->device, status);
            status = EXIT_ERROR;
      }
      inst->exit_status = status;
      if (progress && (inst->flags & FLAG_PROGRESS) &&
          !progress_active()) {
            for (inst2 = instance_list; inst2; inst2 = inst2->next) {
                  if (inst2->flags & FLAG_DONE)
                        continue;
                  if (strcmp(inst2->type, "ext2") &&
                      strcmp(inst2->type, "ext3"))
                        continue;
                  /*
                   * If we've just started the fsck, wait a tiny
                   * bit before sending the kill, to give it
                   * time to set up the signal handler
                   */
                  if (inst2->start_time < time(0)+2) {
                        if (fork() == 0) {
                              sleep(1);
                              kill(inst2->pid, SIGUSR1);
                              exit(0);
                        }
                  } else
                        kill(inst2->pid, SIGUSR1);
                  inst2->flags |= FLAG_PROGRESS;
                  break;
            }
      }
ret_inst:
      if (prev)
            prev->next = inst->next;
      else
            instance_list = inst->next;
      if (verbose > 1)
            printf(_("Finished with %s (exit status %d)\n"),
                   inst->device, inst->exit_status);
      num_running--;
      return inst;
}

/*
 * Wait until all executing child processes have exited; return the
 * logical OR of all of their exit code values.
 */
static int wait_all(int flags)
{
      struct fsck_instance *inst;
      int   global_status = 0;

      while ((inst = wait_one(flags))) {
            global_status |= inst->exit_status;
            free_instance(inst);
#ifdef RANDOM_DEBUG
            if (noexecute && (flags & WNOHANG) && !(random() % 3))
                  break;
#endif
      }
      return global_status;
}

/*
 * Run the fsck program on a particular device
 * 
 * If the type is specified using -t, and it isn't prefixed with "no"
 * (as in "noext2") and only one filesystem type is specified, then
 * use that type regardless of what is specified in /etc/fstab.
 * 
 * If the type isn't specified by the user, then use either the type
 * specified in /etc/fstab, or DEFAULT_FSTYPE.
 */
static void fsck_device(char *device, int interactive)
{
      const char *type = 0;
      struct fs_info *fsent;
      int retval;

      if (fstype && strncmp(fstype, "no", 2) &&
          strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) && 
          !strchr(fstype, ','))
            type = fstype;

      if ((fsent = lookup(device))) {
            device = fsent->device;
            interpret_type(fsent);
            if (!type)
                  type = fsent->type;
      }
      if (!type)
            type = DEFAULT_FSTYPE;

      num_running++;
      retval = execute(type, device, fsent ? fsent->mountpt : 0,
                   interactive);
      if (retval) {
            fprintf(stderr, _("%s: Error %d while executing fsck.%s "
                  "for %s\n"), progname, retval, type, device);
            num_running--;
      }
}


/*
 * Deal with the fsck -t argument.
 */
struct fs_type_compile {
      char **list;
      int *type;
      int  negate;
} fs_type_compiled;

#define FS_TYPE_NORMAL  0
#define FS_TYPE_OPT     1
#define FS_TYPE_NEGOPT  2

static const char *fs_type_syntax_error =
N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
   "with 'no' or '!'.\n");

static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
{
      char  *cp, *list, *s;
      int   num = 2;
      int   negate, first_negate = 1;

      if (fs_type) {
            for (cp=fs_type; *cp; cp++) {
                  if (*cp == ',')
                        num++;
            }
      }

      cmp->list = malloc(num * sizeof(char *));
      cmp->type = malloc(num * sizeof(int));
      if (!cmp->list || !cmp->type) {
            fprintf(stderr, _("Couldn't allocate memory for "
                          "filesystem types\n"));
            exit(EXIT_ERROR);
      }
      memset(cmp->list, 0, num * sizeof(char *));
      memset(cmp->type, 0, num * sizeof(int));
      cmp->negate = 0;

      if (!fs_type)
            return;
      
      list = string_copy(fs_type);
      num = 0;
      s = strtok(list, ",");
      while(s) {
            negate = 0;
            if (strncmp(s, "no", 2) == 0) {
                  s += 2;
                  negate = 1;
            } else if (*s == '!') {
                  s++;
                  negate = 1;
            }
            if (strcmp(s, "loop") == 0)
                  /* loop is really short-hand for opts=loop */
                  goto loop_special_case;
            else if (strncmp(s, "opts=", 5) == 0) {
                  s += 5;
            loop_special_case:
                  cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
            } else {
                  if (first_negate) {
                        cmp->negate = negate;
                        first_negate = 0;
                  }
                  if ((negate && !cmp->negate) ||
                      (!negate && cmp->negate)) {
                        fprintf(stderr, _(fs_type_syntax_error));
                        exit(EXIT_USAGE);
                  }
            }
#if 0
            printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
#endif
              cmp->list[num++] = string_copy(s);
            s = strtok(NULL, ",");
      }
      free(list);
}

/*
 * This function returns true if a particular option appears in a
 * comma-delimited options list
 */
static int opt_in_list(char *opt, char *optlist)
{
      char  *list, *s;

      if (!optlist)
            return 0;
      list = string_copy(optlist);
      
      s = strtok(list, ",");
      while(s) {
            if (strcmp(s, opt) == 0) {
                  free(list);
                  return 1;
            }
            s = strtok(NULL, ",");
      }
        free(list);
      return 0;
}

/* See if the filesystem matches the criteria given by the -t option */
static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
{
      int n, ret = 0, checked_type = 0;
      char *cp;

      if (cmp->list == 0 || cmp->list[0] == 0)
            return 1;

      for (n=0; (cp = cmp->list[n]); n++) {
            switch (cmp->type[n]) {
            case FS_TYPE_NORMAL:
                  checked_type++;
                  if (strcmp(cp, fs->type) == 0) {
                        ret = 1;
                  }
                  break;
            case FS_TYPE_NEGOPT:
                  if (opt_in_list(cp, fs->opts))
                        return 0;
                  break;
            case FS_TYPE_OPT:
                  if (!opt_in_list(cp, fs->opts))
                        return 0;
                  break;
            }
      }
      if (checked_type == 0)
            return 1;
      return (cmp->negate ? !ret : ret);
}

/* Check if we should ignore this filesystem. */
static int ignore(struct fs_info *fs)
{
      const char **ip;
      int wanted = 0;

      /*
       * If the pass number is 0, ignore it.
       */
      if (fs->passno == 0)
            return 1;

      interpret_type(fs);

      /*
       * If a specific fstype is specified, and it doesn't match,
       * ignore it.
       */
      if (!fs_match(fs, &fs_type_compiled)) return 1;
      
      /* Are we ignoring this type? */
      for(ip = ignored_types; *ip; ip++)
            if (strcmp(fs->type, *ip) == 0) return 1;

      /* Do we really really want to check this fs? */
      for(ip = really_wanted; *ip; ip++)
            if (strcmp(fs->type, *ip) == 0) {
                  wanted = 1;
                  break;
            }

      /* See if the <fsck.fs> program is available. */
      if (find_fsck(fs->type) == NULL) {
            if (wanted)
                  fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
                        fs->device, fs->type);
            return 1;
      }

      /* We can and want to check this file system type. */
      return 0;
}

/*
 * Returns TRUE if a partition on the same disk is already being
 * checked.
 */
static int device_already_active(char *device)
{
      struct fsck_instance *inst;
      char *base;

      if (force_all_parallel)
            return 0;

#ifdef BASE_MD
      /* Don't check a soft raid disk with any other disk */
      if (instance_list &&
          (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
           !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
            return 1;
#endif

      base = base_device(device);
      /*
       * If we don't know the base device, assume that the device is
       * already active if there are any fsck instances running.
       */
      if (!base) 
            return (instance_list != 0);
      for (inst = instance_list; inst; inst = inst->next) {
            if (!inst->base_device || !strcmp(base, inst->base_device)) {
                  free(base);
                  return 1;
            }
      }
      free(base);
      return 0;
}

/* Check all file systems, using the /etc/fstab table. */
static int check_all(NOARGS)
{
      struct fs_info *fs = NULL;
      struct fsck_instance *inst;
      int status = EXIT_OK;
      int not_done_yet = 1;
      int passno = 1;
      int pass_done;

      if (verbose)
            printf(_("Checking all file systems.\n"));

      /*
       * Do an initial scan over the filesystem; mark filesystems
       * which should be ignored as done, and resolve LABEL= and
       * UUID= specifications to the real device.
       */
      for (fs = filesys_info; fs; fs = fs->next) {
            if (ignore(fs))
                  fs->flags |= FLAG_DONE;
            else
                  fs->device = interpret_device(fs->device);
      }
            
      /*
       * Find and check the root filesystem.
       */
      if (!parallel_root) {
            for (fs = filesys_info; fs; fs = fs->next) {
                  if (!strcmp(fs->mountpt, "/"))
                        break;
            }
            if (fs) {
                  if (!skip_root && !ignore(fs)) {
                        fsck_device(fs->device, 1);
                        status |= wait_all(0);
                        if (status > EXIT_NONDESTRUCT)
                              return status;
                  }
                  fs->flags |= FLAG_DONE;
            }
      }

      while (not_done_yet) {
            not_done_yet = 0;
            pass_done = 1;

            for (fs = filesys_info; fs; fs = fs->next) {
                  if (fs->flags & FLAG_DONE)
                        continue;
                  /*
                   * If the filesystem's pass number is higher
                   * than the current pass number, then we don't
                   * do it yet.
                   */
                  if (fs->passno > passno) {
                        not_done_yet++;
                        continue;
                  }
                  /*
                   * If a filesystem on a particular device has
                   * already been spawned, then we need to defer
                   * this to another pass.
                   */
                  if (device_already_active(fs->device)) {
                        pass_done = 0;
                        continue;
                  }
                  /*
                   * Spawn off the fsck process
                   */
                  fsck_device(fs->device, serialize);
                  fs->flags |= FLAG_DONE;

                  /*
                   * Only do one filesystem at a time, or if we
                   * have a limit on the number of fsck's extant
                   * at one time, apply that limit.
                   */
                  if (serialize ||
                      (max_running && (num_running >= max_running))) {
                        pass_done = 0;
                        break;
                  }
            }
            if (verbose > 1)
                  printf(_("--waiting-- (pass %d)\n"), passno);
            status |= wait_all(pass_done ? 0 : WNOHANG);
            if (pass_done) {
                  if (verbose > 1) 
                        printf("----------------------------------\n");
                  passno++;
            } else
                  not_done_yet++;
      }
      status |= wait_all(0);
      return status;
}

static void usage(NOARGS)
{
      fprintf(stderr,
            _("Usage: fsck [-ACNPRTV] [-t fstype] [fs-options] filesys\n"));
      exit(EXIT_USAGE);
}

static void PRS(int argc, char *argv[])
{
      int   i, j;
      char  *arg, *tmp;
      char  options[128];
      int   opt = 0;
      int     opts_for_fsck = 0;
      
      num_devices = 0;
      num_args = 0;
      instance_list = 0;

      progname = argv[0];

      for (i=1; i < argc; i++) {
            arg = argv[i];
            if (!arg)
                  continue;
            if ((arg[0] == '/' && !opts_for_fsck) ||
                (strncmp(arg, "LABEL=", 6) == 0) ||
                (strncmp(arg, "UUID=", 5) == 0)) {
                  if (num_devices >= MAX_DEVICES) {
                        fprintf(stderr, _("%s: too many devices\n"),
                              progname);
                        exit(EXIT_ERROR);
                  }
                  devices[num_devices++] =
                        interpret_device(string_copy(arg));
                  continue;
            }
            if (arg[0] != '-' || opts_for_fsck) {
                  if (num_args >= MAX_ARGS) {
                        fprintf(stderr, _("%s: too many arguments\n"),
                              progname);
                        exit(EXIT_ERROR);
                  }
                  args[num_args++] = string_copy(arg);
                  continue;
            }
            for (j=1; arg[j]; j++) {
                  if (opts_for_fsck) {
                        options[++opt] = arg[j];
                        continue;
                  }
                  switch (arg[j]) {
                  case 'A':
                        doall++;
                        break;
                  case 'C':
                        progress++;
                        break;
                  case 'V':
                        verbose++;
                        break;
                  case 'N':
                        noexecute++;
                        break;
                  case 'R':
                        skip_root++;
                        break;
                  case 'T':
                        notitle++;
                        break;
                  case 'M':
                        like_mount++;
                        break;
                  case 'P':
                        parallel_root++;
                        break;
                  case 's':
                        serialize++;
                        break;
                  case 't':
                        if (fstype)
                              usage();
                        if (arg[j+1])
                              tmp = arg+j+1;
                        else if ((i+1) < argc)
                              tmp = argv[++i];
                        else
                              usage();
                        fstype = string_copy(tmp);
                        compile_fs_type(fstype, &fs_type_compiled);
                        goto next_arg;
                  case '-':
                        opts_for_fsck++;
                        break;
                  case '?':
                        usage();
                        break;
                  default:
                        options[++opt] = arg[j];
                        break;
                  }
            }
      next_arg:
            if (opt) {
                  options[0] = '-';
                  options[++opt] = '\0';
                  if (num_args >= MAX_ARGS) {
                        fprintf(stderr,
                              _("%s: too many arguments\n"),
                              progname);
                        exit(EXIT_ERROR);
                  }
                  args[num_args++] = string_copy(options);
                  opt = 0;
            }
      }
      if (getenv("FSCK_FORCE_ALL_PARALLEL"))
            force_all_parallel++;
      if ((tmp = getenv("FSCK_MAX_INST")))
          max_running = atoi(tmp);
}

int main(int argc, char *argv[])
{
      int i;
      int status = 0;
      int interactive = 0;
      char *oldpath = getenv("PATH");
      const char *fstab;

#ifdef ENABLE_NLS
      setlocale(LC_MESSAGES, "");
      setlocale(LC_CTYPE, "");
      bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
      textdomain(NLS_CAT_NAME);
#endif
      PRS(argc, argv);

      if (!notitle)
            printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);

      fstab = getenv("FSTAB_FILE");
      if (!fstab)
            fstab = _PATH_MNTTAB;
      load_fs_info(fstab);

      /* Update our search path to include uncommon directories. */
      if (oldpath) {
            fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
                            strlen (oldpath) + 1);
            strcpy (fsck_path, fsck_prefix_path);
            strcat (fsck_path, ":");
            strcat (fsck_path, oldpath);
      } else {
            fsck_path = string_copy(fsck_prefix_path);
      }
      
      if ((num_devices == 1) || (serialize))
            interactive = 1;

      /* If -A was specified ("check all"), do that! */
      if (doall)
            return check_all();

      if (num_devices == 0) {
            fprintf(stderr, _("\nNo devices specified to be checked!\n"));
            exit(EXIT_ERROR);
      }
      for (i = 0 ; i < num_devices; i++) {
            fsck_device(devices[i], interactive);
            if (serialize || (num_running >= max_running)) {
                  struct fsck_instance *inst;

                  inst = wait_one(0);
                  if (inst) {
                        status |= inst->exit_status;
                        free_instance(inst);
                  }
            }
      }
      status |= wait_all(0);
      free(fsck_path);
      return status;
}

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