fsck.c revision a1069118d438851e69c3dd6e38211fc4adfc7048 
1/*
2 * pfsck --- A generic, parallelizing front-end for the fsck program.
3 * It will automatically try to run fsck programs in parallel if the
4 * devices are on separate spindles.  It is based on the same ideas as
5 * the generic front end for fsck by David Engel and Fred van Kempen,
6 * but it has been completely rewritten from scratch to support
7 * parallel execution.
8 *
9 * Written by Theodore Ts'o, <tytso@mit.edu>
10 *
11 * Usage:	fsck [-ACVRNTM] [-s] [-t fstype] [fs-options] device
12 *
13 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
14 *   o Changed -t fstype to behave like with mount when -A (all file
15 *     systems) or -M (like mount) is specified.
16 *   o fsck looks if it can find the fsck.type program to decide
17 *     if it should ignore the fs type. This way more fsck programs
18 *     can be added without changing this front-end.
19 *   o -R flag skip root file system.
20 *
21 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
22 *
23 * %Begin-Header%
24 * This file may be redistributed under the terms of the GNU Public
25 * License.
26 * %End-Header%
27 */
28
29#include <sys/types.h>
30#include <sys/wait.h>
31#include <sys/signal.h>
32#include <sys/stat.h>
33#include <limits.h>
34#include <stdio.h>
35#include <ctype.h>
36#include <string.h>
37#include <time.h>
38#if HAVE_STDLIB_H
39#include <stdlib.h>
40#endif
41#if HAVE_ERRNO_H
42#include <errno.h>
43#endif
44#if HAVE_PATHS_H
45#include <paths.h>
46#endif
47#if HAVE_UNISTD_H
48#include <unistd.h>
49#endif
50#if HAVE_ERRNO_H
51#include <errno.h>
52#endif
53#include <malloc.h>
54
55#include "../version.h"
56#include "nls-enable.h"
57#include "fsck.h"
58#include "get_device_by_label.h"
59
60#ifndef _PATH_MNTTAB
61#define	_PATH_MNTTAB	"/etc/fstab"
62#endif
63
64static const char *ignored_types[] = {
65	"ignore",
66	"iso9660",
67	"nfs",
68	"proc",
69	"sw",
70	"swap",
71	NULL
72};
73
74static const char *really_wanted[] = {
75	"minix",
76	"ext2",
77	"ext3",
78	"xiafs",
79	NULL
80};
81
82#define BASE_MD "/dev/md"
83
84/*
85 * Global variables for options
86 */
87char *devices[MAX_DEVICES];
88char *args[MAX_ARGS];
89int num_devices, num_args;
90
91int verbose = 0;
92int doall = 0;
93int noexecute = 0;
94int serialize = 0;
95int skip_root = 0;
96int like_mount = 0;
97int notitle = 0;
98int parallel_root = 0;
99int progress = 0;
100int force_all_parallel = 0;
101int num_running = 0;
102int max_running = 0;
103char *progname;
104char *fstype = NULL;
105struct fs_info *filesys_info;
106struct fsck_instance *instance_list;
107const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
108char *fsck_path = 0;
109static int ignore(struct fs_info *);
110
111static char *skip_over_blank(char *cp)
112{
113	while (*cp && isspace(*cp))
114		cp++;
115	return cp;
116}
117
118static char *skip_over_word(char *cp)
119{
120	while (*cp && !isspace(*cp))
121		cp++;
122	return cp;
123}
124
125static void strip_line(char *line)
126{
127	char	*p;
128
129	while (*line) {
130		p = line + strlen(line) - 1;
131		if ((*p == '\n') || (*p == '\r'))
132			*p = 0;
133		else
134			break;
135	}
136}
137
138static char *parse_word(char **buf)
139{
140	char *word, *next;
141
142	word = *buf;
143	if (*word == 0)
144		return 0;
145
146	word = skip_over_blank(word);
147	next = skip_over_word(word);
148	if (*next)
149		*next++ = 0;
150	*buf = next;
151	return word;
152}
153
154static void free_instance(struct fsck_instance *i)
155{
156	if (i->prog)
157		free(i->prog);
158	if (i->device)
159		free(i->device);
160	if (i->base_device)
161		free(i->base_device);
162	free(i);
163	return;
164}
165
166static int parse_fstab_line(char *line, struct fs_info **ret_fs)
167{
168	char	*device, *mntpnt, *type, *opts, *freq, *passno, *cp;
169	struct fs_info *fs;
170
171	*ret_fs = 0;
172	strip_line(line);
173	if ((cp = strchr(line, '#')))
174		*cp = 0;	/* Ignore everything after the comment char */
175	cp = line;
176
177	device = parse_word(&cp);
178	mntpnt = parse_word(&cp);
179	type = parse_word(&cp);
180	opts = parse_word(&cp);
181	freq = parse_word(&cp);
182	passno = parse_word(&cp);
183
184	if (!device)
185		return 0;	/* Allow blank lines */
186
187	if (!mntpnt || !type)
188		return -1;
189
190	if (!(fs = malloc(sizeof(struct fs_info))))
191		return -1;
192
193	fs->device = string_copy(device);
194	fs->mountpt = string_copy(mntpnt);
195	fs->type = string_copy(type);
196	fs->opts = string_copy(opts ? opts : "");
197	fs->freq = freq ? atoi(freq) : -1;
198	fs->passno = passno ? atoi(passno) : -1;
199	fs->flags = 0;
200	fs->next = NULL;
201
202	*ret_fs = fs;
203
204	return 0;
205}
206
207/*
208 * Interpret the device name if necessary
209 */
210static char *interpret_device(char *spec)
211{
212	char *dev = interpret_spec(spec);
213
214	if (dev)
215		return dev;
216
217	/*
218	 * Check to see if this was because /proc/partitions isn't
219	 * found.
220	 */
221	if (access("/proc/partitions", R_OK) < 0) {
222		fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
223			strerror(errno));
224		fprintf(stderr, "Is /proc mounted?\n");
225		exit(EXIT_ERROR);
226	}
227	/*
228	 * Check to see if this is because we're not running as root
229	 */
230	if (geteuid())
231		fprintf(stderr,
232			"Must be root to scan for matching filesystems: %s\n",
233			spec);
234	else
235		fprintf(stderr, "Couldn't find matching filesystem: %s\n",
236			spec);
237	exit(EXIT_ERROR);
238}
239
240/*
241 * Interpret filesystem auto type if necessary
242 */
243static void interpret_type(struct fs_info *fs)
244{
245	const char	*type;
246
247	if (strcmp(fs->type, "auto") == 0) {
248		if (fs && strchr(fs->device, '='))
249			fs->device = interpret_device(fs->device);
250		type = identify_fs(fs->device);
251		if (type) {
252			free(fs->type);
253			fs->type = string_copy(type);
254		} else
255			fprintf(stderr, _("Could not determine "
256					  "filesystem type for %s\n"),
257				fs->device);
258	}
259}
260
261
262/*
263 * Load the filesystem database from /etc/fstab
264 */
265static void load_fs_info(const char *filename)
266{
267	FILE	*f;
268	char	buf[1024];
269	int	lineno = 0;
270	int	old_fstab = 1;
271	struct fs_info *fs, *fs_last = NULL;
272
273	filesys_info = NULL;
274	if ((f = fopen(filename, "r")) == NULL) {
275		fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
276			filename, strerror(errno));
277		return;
278	}
279	while (!feof(f)) {
280		lineno++;
281		if (!fgets(buf, sizeof(buf), f))
282			break;
283		buf[sizeof(buf)-1] = 0;
284		if (parse_fstab_line(buf, &fs) < 0) {
285			fprintf(stderr, _("WARNING: bad format "
286				"on line %d of %s\n"), lineno, filename);
287			continue;
288		}
289		if (!fs)
290			continue;
291		if (!filesys_info)
292			filesys_info = fs;
293		else
294			fs_last->next = fs;
295		fs_last = fs;
296		if (fs->passno < 0)
297			fs->passno = 0;
298		else
299			old_fstab = 0;
300	}
301
302	fclose(f);
303
304	if (old_fstab) {
305		fprintf(stderr, _("\007\007\007"
306		"WARNING: Your /etc/fstab does not contain the fsck passno\n"
307		"	field.  I will kludge around things for you, but you\n"
308		"	should fix your /etc/fstab file as soon as you can.\n\n"));
309
310		for (fs = filesys_info; fs; fs = fs->next) {
311			fs->passno = 1;
312		}
313	}
314}
315
316/* Lookup filesys in /etc/fstab and return the corresponding entry. */
317static struct fs_info *lookup(char *filesys)
318{
319	struct fs_info *fs;
320	int	try_again = 0;
321
322	/* No filesys name given. */
323	if (filesys == NULL)
324		return NULL;
325
326	for (fs = filesys_info; fs; fs = fs->next) {
327		if (strchr(fs->device, '='))
328			try_again++;
329		if (!strcmp(filesys, fs->device) ||
330		    !strcmp(filesys, fs->mountpt))
331			break;
332	}
333	if (fs && strchr(fs->device, '='))
334		fs->device = interpret_device(fs->device);
335
336	if (fs || !try_again)
337		return fs;
338
339	for (fs = filesys_info; fs; fs = fs->next) {
340		fs->device = interpret_device(fs->device);
341		if (!strcmp(filesys, fs->device) ||
342		    !strcmp(filesys, fs->mountpt))
343			break;
344	}
345
346	return fs;
347}
348
349/* Find fsck program for a given fs type. */
350static char *find_fsck(char *type)
351{
352  char *s;
353  const char *tpl;
354  static char prog[256];
355  char *p = string_copy(fsck_path);
356  struct stat st;
357
358  /* Are we looking for a program or just a type? */
359  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
360
361  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
362	sprintf(prog, tpl, s, type);
363	if (stat(prog, &st) == 0) break;
364  }
365  free(p);
366  return(s ? prog : NULL);
367}
368
369static int progress_active(NOARGS)
370{
371	struct fsck_instance *inst;
372
373	for (inst = instance_list; inst; inst = inst->next) {
374		if (inst->flags & FLAG_DONE)
375			continue;
376		if (inst->flags & FLAG_PROGRESS)
377			return 1;
378	}
379	return 0;
380}
381
382/*
383 * Execute a particular fsck program, and link it into the list of
384 * child processes we are waiting for.
385 */
386static int execute(const char *type, char *device, char *mntpt,
387		   int interactive)
388{
389	char *s, *argv[80], prog[80];
390	int  argc, i;
391	struct fsck_instance *inst, *p;
392	pid_t	pid;
393
394	inst = malloc(sizeof(struct fsck_instance));
395	if (!inst)
396		return ENOMEM;
397	memset(inst, 0, sizeof(struct fsck_instance));
398
399	sprintf(prog, "fsck.%s", type);
400	argv[0] = string_copy(prog);
401	argc = 1;
402
403	for (i=0; i <num_args; i++)
404		argv[argc++] = string_copy(args[i]);
405
406	if (progress & !progress_active()) {
407		if ((strcmp(type, "ext2") == 0) ||
408		    (strcmp(type, "ext3") == 0)) {
409			argv[argc++] = string_copy("-C0");
410			inst->flags |= FLAG_PROGRESS;
411		}
412	}
413
414	argv[argc++] = string_copy(device);
415	argv[argc] = 0;
416
417	s = find_fsck(prog);
418	if (s == NULL) {
419		fprintf(stderr, _("fsck: %s: not found\n"), prog);
420		return ENOENT;
421	}
422
423	if (verbose || noexecute) {
424		printf("[%s (%d) -- %s] ", s, num_running,
425		       mntpt ? mntpt : device);
426		for (i=0; i < argc; i++)
427			printf("%s ", argv[i]);
428		printf("\n");
429	}
430
431	/* Fork and execute the correct program. */
432	if (noexecute)
433		pid = -1;
434	else if ((pid = fork()) < 0) {
435		perror("fork");
436		return errno;
437	} else if (pid == 0) {
438		if (!interactive)
439			close(0);
440		(void) execv(s, argv);
441		perror(argv[0]);
442		exit(EXIT_ERROR);
443	}
444
445	for (i=0; i < argc; i++)
446		free(argv[i]);
447
448	inst->pid = pid;
449	inst->prog = string_copy(prog);
450	inst->type = string_copy(type);
451	inst->device = string_copy(device);
452	inst->base_device = base_device(device);
453	inst->start_time = time(0);
454	inst->next = NULL;
455
456	/*
457	 * Find the end of the list, so we add the instance on at the end.
458	 */
459	for (p = instance_list; p && p->next; p = p->next);
460
461	if (p)
462		p->next = inst;
463	else
464		instance_list = inst;
465
466	return 0;
467}
468
469/*
470 * Wait for one child process to exit; when it does, unlink it from
471 * the list of executing child processes, and return it.
472 */
473static struct fsck_instance *wait_one(int flags)
474{
475	int	status;
476	int	sig;
477	struct fsck_instance *inst, *inst2, *prev;
478	pid_t	pid;
479
480	if (!instance_list)
481		return NULL;
482
483	if (noexecute) {
484		inst = instance_list;
485		prev = 0;
486#ifdef RANDOM_DEBUG
487		while (inst->next && (random() & 1)) {
488			prev = inst;
489			inst = inst->next;
490		}
491#endif
492		inst->exit_status = 0;
493		goto ret_inst;
494	}
495
496	/*
497	 * gcc -Wall fails saving throw against stupidity
498	 * (inst and prev are thought to be uninitialized variables)
499	 */
500	inst = prev = NULL;
501
502	do {
503		pid = waitpid(-1, &status, flags);
504		if ((pid == 0) && (flags & WNOHANG))
505			return NULL;
506		if (pid < 0) {
507			if ((errno == EINTR) || (errno == EAGAIN))
508				continue;
509			if (errno == ECHILD) {
510				fprintf(stderr,
511					_("%s: wait: No more child process?!?\n"),
512					progname);
513				return NULL;
514			}
515			perror("wait");
516			continue;
517		}
518		for (prev = 0, inst = instance_list;
519		     inst;
520		     prev = inst, inst = inst->next) {
521			if (inst->pid == pid)
522				break;
523		}
524	} while (!inst);
525
526	if (WIFEXITED(status))
527		status = WEXITSTATUS(status);
528	else if (WIFSIGNALED(status)) {
529		sig = WTERMSIG(status);
530		if (sig == SIGINT) {
531			status = EXIT_UNCORRECTED;
532		} else {
533			printf(_("Warning... %s for device %s exited "
534			       "with signal %d.\n"),
535			       inst->prog, inst->device, sig);
536			status = EXIT_ERROR;
537		}
538	} else {
539		printf(_("%s %s: status is %x, should never happen.\n"),
540		       inst->prog, inst->device, status);
541		status = EXIT_ERROR;
542	}
543	inst->exit_status = status;
544	if (progress && (inst->flags & FLAG_PROGRESS) &&
545	    !progress_active()) {
546		for (inst2 = instance_list; inst2; inst2 = inst2->next) {
547			if (inst2->flags & FLAG_DONE)
548				continue;
549			if (strcmp(inst2->type, "ext2") &&
550			    strcmp(inst2->type, "ext3"))
551				continue;
552			/*
553			 * If we've just started the fsck, wait a tiny
554			 * bit before sending the kill, to give it
555			 * time to set up the signal handler
556			 */
557			if (inst2->start_time < time(0)+2) {
558				if (fork() == 0) {
559					sleep(1);
560					kill(inst2->pid, SIGUSR1);
561					exit(0);
562				}
563			} else
564				kill(inst2->pid, SIGUSR1);
565			inst2->flags |= FLAG_PROGRESS;
566			break;
567		}
568	}
569ret_inst:
570	if (prev)
571		prev->next = inst->next;
572	else
573		instance_list = inst->next;
574	if (verbose > 1)
575		printf(_("Finished with %s (exit status %d)\n"),
576		       inst->device, inst->exit_status);
577	num_running--;
578	return inst;
579}
580
581/*
582 * Wait until all executing child processes have exited; return the
583 * logical OR of all of their exit code values.
584 */
585static int wait_all(int flags)
586{
587	struct fsck_instance *inst;
588	int	global_status = 0;
589
590	while ((inst = wait_one(flags))) {
591		global_status |= inst->exit_status;
592		free_instance(inst);
593#ifdef RANDOM_DEBUG
594		if (noexecute && (flags & WNOHANG) && !(random() % 3))
595			break;
596#endif
597	}
598	return global_status;
599}
600
601/*
602 * Run the fsck program on a particular device
603 *
604 * If the type is specified using -t, and it isn't prefixed with "no"
605 * (as in "noext2") and only one filesystem type is specified, then
606 * use that type regardless of what is specified in /etc/fstab.
607 *
608 * If the type isn't specified by the user, then use either the type
609 * specified in /etc/fstab, or DEFAULT_FSTYPE.
610 */
611static void fsck_device(char *device, int interactive)
612{
613	const char *type = 0;
614	struct fs_info *fsent;
615	int retval;
616
617	if (fstype && strncmp(fstype, "no", 2) &&
618	    strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
619	    !strchr(fstype, ','))
620		type = fstype;
621
622	if ((fsent = lookup(device))) {
623		device = fsent->device;
624		interpret_type(fsent);
625		if (!type)
626			type = fsent->type;
627	}
628	if (!type)
629		type = DEFAULT_FSTYPE;
630
631	num_running++;
632	retval = execute(type, device, fsent ? fsent->mountpt : 0,
633			 interactive);
634	if (retval) {
635		fprintf(stderr, _("%s: Error %d while executing fsck.%s "
636			"for %s\n"), progname, retval, type, device);
637		num_running--;
638	}
639}
640
641
642/*
643 * Deal with the fsck -t argument.
644 */
645struct fs_type_compile {
646	char **list;
647	int *type;
648	int  negate;
649} fs_type_compiled;
650
651#define FS_TYPE_NORMAL	0
652#define FS_TYPE_OPT	1
653#define FS_TYPE_NEGOPT	2
654
655static const char *fs_type_syntax_error =
656N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
657   "with 'no' or '!'.\n");
658
659static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
660{
661	char 	*cp, *list, *s;
662	int	num = 2;
663	int	negate, first_negate = 1;
664
665	if (fs_type) {
666		for (cp=fs_type; *cp; cp++) {
667			if (*cp == ',')
668				num++;
669		}
670	}
671
672	cmp->list = malloc(num * sizeof(char *));
673	cmp->type = malloc(num * sizeof(int));
674	if (!cmp->list || !cmp->type) {
675		fprintf(stderr, _("Couldn't allocate memory for "
676				  "filesystem types\n"));
677		exit(EXIT_ERROR);
678	}
679	memset(cmp->list, 0, num * sizeof(char *));
680	memset(cmp->type, 0, num * sizeof(int));
681	cmp->negate = 0;
682
683	if (!fs_type)
684		return;
685
686	list = string_copy(fs_type);
687	num = 0;
688	s = strtok(list, ",");
689	while(s) {
690		negate = 0;
691		if (strncmp(s, "no", 2) == 0) {
692			s += 2;
693			negate = 1;
694		} else if (*s == '!') {
695			s++;
696			negate = 1;
697		}
698		if (strcmp(s, "loop") == 0)
699			/* loop is really short-hand for opts=loop */
700			goto loop_special_case;
701		else if (strncmp(s, "opts=", 5) == 0) {
702			s += 5;
703		loop_special_case:
704			cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
705		} else {
706			if (first_negate) {
707				cmp->negate = negate;
708				first_negate = 0;
709			}
710			if ((negate && !cmp->negate) ||
711			    (!negate && cmp->negate)) {
712				fprintf(stderr, _(fs_type_syntax_error));
713				exit(EXIT_USAGE);
714			}
715		}
716#if 0
717		printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
718#endif
719	        cmp->list[num++] = string_copy(s);
720		s = strtok(NULL, ",");
721	}
722	free(list);
723}
724
725/*
726 * This function returns true if a particular option appears in a
727 * comma-delimited options list
728 */
729static int opt_in_list(char *opt, char *optlist)
730{
731	char	*list, *s;
732
733	if (!optlist)
734		return 0;
735	list = string_copy(optlist);
736
737	s = strtok(list, ",");
738	while(s) {
739		if (strcmp(s, opt) == 0) {
740			free(list);
741			return 1;
742		}
743		s = strtok(NULL, ",");
744	}
745        free(list);
746	return 0;
747}
748
749/* See if the filesystem matches the criteria given by the -t option */
750static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
751{
752	int n, ret = 0, checked_type = 0;
753	char *cp;
754
755	if (cmp->list == 0 || cmp->list[0] == 0)
756		return 1;
757
758	for (n=0; (cp = cmp->list[n]); n++) {
759		switch (cmp->type[n]) {
760		case FS_TYPE_NORMAL:
761			checked_type++;
762			if (strcmp(cp, fs->type) == 0) {
763				ret = 1;
764			}
765			break;
766		case FS_TYPE_NEGOPT:
767			if (opt_in_list(cp, fs->opts))
768				return 0;
769			break;
770		case FS_TYPE_OPT:
771			if (!opt_in_list(cp, fs->opts))
772				return 0;
773			break;
774		}
775	}
776	if (checked_type == 0)
777		return 1;
778	return (cmp->negate ? !ret : ret);
779}
780
781/* Check if we should ignore this filesystem. */
782static int ignore(struct fs_info *fs)
783{
784	const char **ip;
785	int wanted = 0;
786
787	/*
788	 * If the pass number is 0, ignore it.
789	 */
790	if (fs->passno == 0)
791		return 1;
792
793	interpret_type(fs);
794
795	/*
796	 * If a specific fstype is specified, and it doesn't match,
797	 * ignore it.
798	 */
799	if (!fs_match(fs, &fs_type_compiled)) return 1;
800
801	/* Are we ignoring this type? */
802	for(ip = ignored_types; *ip; ip++)
803		if (strcmp(fs->type, *ip) == 0) return 1;
804
805	/* Do we really really want to check this fs? */
806	for(ip = really_wanted; *ip; ip++)
807		if (strcmp(fs->type, *ip) == 0) {
808			wanted = 1;
809			break;
810		}
811
812	/* See if the <fsck.fs> program is available. */
813	if (find_fsck(fs->type) == NULL) {
814		if (wanted)
815			fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
816				fs->device, fs->type);
817		return 1;
818	}
819
820	/* We can and want to check this file system type. */
821	return 0;
822}
823
824/*
825 * Returns TRUE if a partition on the same disk is already being
826 * checked.
827 */
828static int device_already_active(char *device)
829{
830	struct fsck_instance *inst;
831	char *base;
832
833	if (force_all_parallel)
834		return 0;
835
836#ifdef BASE_MD
837	/* Don't check a soft raid disk with any other disk */
838	if (instance_list &&
839	    (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
840	     !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
841		return 1;
842#endif
843
844	base = base_device(device);
845	/*
846	 * If we don't know the base device, assume that the device is
847	 * already active if there are any fsck instances running.
848	 */
849	if (!base)
850		return (instance_list != 0);
851	for (inst = instance_list; inst; inst = inst->next) {
852		if (!inst->base_device || !strcmp(base, inst->base_device)) {
853			free(base);
854			return 1;
855		}
856	}
857	free(base);
858	return 0;
859}
860
861/* Check all file systems, using the /etc/fstab table. */
862static int check_all(NOARGS)
863{
864	struct fs_info *fs = NULL;
865	struct fsck_instance *inst;
866	int status = EXIT_OK;
867	int not_done_yet = 1;
868	int passno = 1;
869	int pass_done;
870
871	if (verbose)
872		printf(_("Checking all file systems.\n"));
873
874	/*
875	 * Do an initial scan over the filesystem; mark filesystems
876	 * which should be ignored as done, and resolve LABEL= and
877	 * UUID= specifications to the real device.
878	 */
879	for (fs = filesys_info; fs; fs = fs->next) {
880		if (ignore(fs))
881			fs->flags |= FLAG_DONE;
882		else
883			fs->device = interpret_device(fs->device);
884	}
885
886	/*
887	 * Find and check the root filesystem.
888	 */
889	if (!parallel_root) {
890		for (fs = filesys_info; fs; fs = fs->next) {
891			if (!strcmp(fs->mountpt, "/"))
892				break;
893		}
894		if (fs) {
895			if (!skip_root && !ignore(fs)) {
896				fsck_device(fs->device, 1);
897				status |= wait_all(0);
898				if (status > EXIT_NONDESTRUCT)
899					return status;
900			}
901			fs->flags |= FLAG_DONE;
902		}
903	}
904
905	while (not_done_yet) {
906		not_done_yet = 0;
907		pass_done = 1;
908
909		for (fs = filesys_info; fs; fs = fs->next) {
910			if (fs->flags & FLAG_DONE)
911				continue;
912			/*
913			 * If the filesystem's pass number is higher
914			 * than the current pass number, then we don't
915			 * do it yet.
916			 */
917			if (fs->passno > passno) {
918				not_done_yet++;
919				continue;
920			}
921			/*
922			 * If a filesystem on a particular device has
923			 * already been spawned, then we need to defer
924			 * this to another pass.
925			 */
926			if (device_already_active(fs->device)) {
927				pass_done = 0;
928				continue;
929			}
930			/*
931			 * Spawn off the fsck process
932			 */
933			fsck_device(fs->device, serialize);
934			fs->flags |= FLAG_DONE;
935
936			/*
937			 * Only do one filesystem at a time, or if we
938			 * have a limit on the number of fsck's extant
939			 * at one time, apply that limit.
940			 */
941			if (serialize ||
942			    (max_running && (num_running >= max_running))) {
943				pass_done = 0;
944				break;
945			}
946		}
947		if (verbose > 1)
948			printf(_("--waiting-- (pass %d)\n"), passno);
949		status |= wait_all(pass_done ? 0 : WNOHANG);
950		if (pass_done) {
951			if (verbose > 1)
952				printf("----------------------------------\n");
953			passno++;
954		} else
955			not_done_yet++;
956	}
957	status |= wait_all(0);
958	return status;
959}
960
961static void usage(NOARGS)
962{
963	fprintf(stderr,
964		_("Usage: fsck [-ACNPRTV] [-t fstype] [fs-options] filesys\n"));
965	exit(EXIT_USAGE);
966}
967
968static void PRS(int argc, char *argv[])
969{
970	int	i, j;
971	char	*arg, *tmp;
972	char	options[128];
973	int	opt = 0;
974	int     opts_for_fsck = 0;
975
976	num_devices = 0;
977	num_args = 0;
978	instance_list = 0;
979
980	progname = argv[0];
981
982	for (i=1; i < argc; i++) {
983		arg = argv[i];
984		if (!arg)
985			continue;
986		if ((arg[0] == '/' && !opts_for_fsck) ||
987		    (strncmp(arg, "LABEL=", 6) == 0) ||
988		    (strncmp(arg, "UUID=", 5) == 0)) {
989			if (num_devices >= MAX_DEVICES) {
990				fprintf(stderr, _("%s: too many devices\n"),
991					progname);
992				exit(EXIT_ERROR);
993			}
994			devices[num_devices++] =
995				interpret_device(string_copy(arg));
996			continue;
997		}
998		if (arg[0] != '-' || opts_for_fsck) {
999			if (num_args >= MAX_ARGS) {
1000				fprintf(stderr, _("%s: too many arguments\n"),
1001					progname);
1002				exit(EXIT_ERROR);
1003			}
1004			args[num_args++] = string_copy(arg);
1005			continue;
1006		}
1007		for (j=1; arg[j]; j++) {
1008			if (opts_for_fsck) {
1009				options[++opt] = arg[j];
1010				continue;
1011			}
1012			switch (arg[j]) {
1013			case 'A':
1014				doall++;
1015				break;
1016			case 'C':
1017				progress++;
1018				break;
1019			case 'V':
1020				verbose++;
1021				break;
1022			case 'N':
1023				noexecute++;
1024				break;
1025			case 'R':
1026				skip_root++;
1027				break;
1028			case 'T':
1029				notitle++;
1030				break;
1031			case 'M':
1032				like_mount++;
1033				break;
1034			case 'P':
1035				parallel_root++;
1036				break;
1037			case 's':
1038				serialize++;
1039				break;
1040			case 't':
1041				if (fstype)
1042					usage();
1043				if (arg[j+1])
1044					tmp = arg+j+1;
1045				else if ((i+1) < argc)
1046					tmp = argv[++i];
1047				else
1048					usage();
1049				fstype = string_copy(tmp);
1050				compile_fs_type(fstype, &fs_type_compiled);
1051				goto next_arg;
1052			case '-':
1053				opts_for_fsck++;
1054				break;
1055			case '?':
1056				usage();
1057				break;
1058			default:
1059				options[++opt] = arg[j];
1060				break;
1061			}
1062		}
1063	next_arg:
1064		if (opt) {
1065			options[0] = '-';
1066			options[++opt] = '\0';
1067			if (num_args >= MAX_ARGS) {
1068				fprintf(stderr,
1069					_("%s: too many arguments\n"),
1070					progname);
1071				exit(EXIT_ERROR);
1072			}
1073			args[num_args++] = string_copy(options);
1074			opt = 0;
1075		}
1076	}
1077	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1078		force_all_parallel++;
1079	if ((tmp = getenv("FSCK_MAX_INST")))
1080	    max_running = atoi(tmp);
1081}
1082
1083int main(int argc, char *argv[])
1084{
1085	int i;
1086	int status = 0;
1087	int interactive = 0;
1088	char *oldpath = getenv("PATH");
1089	const char *fstab;
1090
1091#ifdef ENABLE_NLS
1092	setlocale(LC_MESSAGES, "");
1093	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1094	textdomain(NLS_CAT_NAME);
1095#endif
1096	PRS(argc, argv);
1097
1098	if (!notitle)
1099		printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1100
1101	fstab = getenv("FSTAB_FILE");
1102	if (!fstab)
1103		fstab = _PATH_MNTTAB;
1104	load_fs_info(fstab);
1105
1106	/* Update our search path to include uncommon directories. */
1107	if (oldpath) {
1108		fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1109				    strlen (oldpath) + 1);
1110		strcpy (fsck_path, fsck_prefix_path);
1111		strcat (fsck_path, ":");
1112		strcat (fsck_path, oldpath);
1113	} else {
1114		fsck_path = string_copy(fsck_prefix_path);
1115	}
1116
1117	if ((num_devices == 1) || (serialize))
1118		interactive = 1;
1119
1120	/* If -A was specified ("check all"), do that! */
1121	if (doall)
1122		return check_all();
1123
1124	if (num_devices == 0) {
1125		fprintf(stderr, _("\nNo devices specified to be checked!\n"));
1126		exit(EXIT_ERROR);
1127	}
1128	for (i = 0 ; i < num_devices; i++) {
1129		fsck_device(devices[i], interactive);
1130		if (serialize || (num_running >= max_running)) {
1131			struct fsck_instance *inst;
1132
1133			inst = wait_one(0);
1134			if (inst) {
1135				status |= inst->exit_status;
1136				free_instance(inst);
1137			}
1138		}
1139	}
1140	status |= wait_all(0);
1141	free(fsck_path);
1142	return status;
1143}
1144