fsck.c revision efc6f628e15de95bcd13e4f0ee223cb42115d520 
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 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
12 *   o Changed -t fstype to behave like with mount when -A (all file
13 *     systems) or -M (like mount) is specified.
14 *   o fsck looks if it can find the fsck.type program to decide
15 *     if it should ignore the fs type. This way more fsck programs
16 *     can be added without changing this front-end.
17 *   o -R flag skip root file system.
18 *
19 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
20 * 	2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.
21 *
22 * %Begin-Header%
23 * This file may be redistributed under the terms of the GNU Public
24 * License.
25 * %End-Header%
26 */
27
28#define _XOPEN_SOURCE 600 /* for inclusion of sa_handler in Solaris */
29
30#include <sys/types.h>
31#include <sys/wait.h>
32#include <sys/signal.h>
33#include <sys/stat.h>
34#include <limits.h>
35#include <stdio.h>
36#include <ctype.h>
37#include <string.h>
38#include <time.h>
39#if HAVE_STDLIB_H
40#include <stdlib.h>
41#endif
42#if HAVE_ERRNO_H
43#include <errno.h>
44#endif
45#if HAVE_PATHS_H
46#include <paths.h>
47#endif
48#if HAVE_UNISTD_H
49#include <unistd.h>
50#endif
51#if HAVE_ERRNO_H
52#include <errno.h>
53#endif
54#if HAVE_MALLOC_H
55#include <malloc.h>
56#endif
57#ifdef HAVE_SIGNAL_H
58#include <signal.h>
59#endif
60
61#include "../version.h"
62#include "nls-enable.h"
63#include "fsck.h"
64#include "blkid/blkid.h"
65
66#ifndef _PATH_MNTTAB
67#define	_PATH_MNTTAB	"/etc/fstab"
68#endif
69
70static const char *ignored_types[] = {
71	"ignore",
72	"iso9660",
73	"nfs",
74	"proc",
75	"sw",
76	"swap",
77	"tmpfs",
78	"devpts",
79	NULL
80};
81
82static const char *really_wanted[] = {
83	"minix",
84	"ext2",
85	"ext3",
86	"ext4",
87	"ext4dev",
88	"jfs",
89	"reiserfs",
90	"xiafs",
91	"xfs",
92	NULL
93};
94
95#define BASE_MD "/dev/md"
96
97/*
98 * Global variables for options
99 */
100char *devices[MAX_DEVICES];
101char *args[MAX_ARGS];
102int num_devices, num_args;
103
104int verbose = 0;
105int doall = 0;
106int noexecute = 0;
107int serialize = 0;
108int skip_root = 0;
109int ignore_mounted = 0;
110int notitle = 0;
111int parallel_root = 0;
112int progress = 0;
113int progress_fd = 0;
114int force_all_parallel = 0;
115int num_running = 0;
116int max_running = 0;
117volatile int cancel_requested = 0;
118int kill_sent = 0;
119char *progname;
120char *fstype = NULL;
121struct fs_info *filesys_info = NULL, *filesys_last = NULL;
122struct fsck_instance *instance_list;
123const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
124char *fsck_path = 0;
125blkid_cache cache = NULL;
126
127static char *string_copy(const char *s)
128{
129	char	*ret;
130
131	if (!s)
132		return 0;
133	ret = malloc(strlen(s)+1);
134	if (ret)
135		strcpy(ret, s);
136	return ret;
137}
138
139static int string_to_int(const char *s)
140{
141	long l;
142	char *p;
143
144	l = strtol(s, &p, 0);
145	if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
146		return -1;
147	else
148		return (int) l;
149}
150
151static int ignore(struct fs_info *);
152
153static char *skip_over_blank(char *cp)
154{
155	while (*cp && isspace(*cp))
156		cp++;
157	return cp;
158}
159
160static char *skip_over_word(char *cp)
161{
162	while (*cp && !isspace(*cp))
163		cp++;
164	return cp;
165}
166
167static void strip_line(char *line)
168{
169	char	*p;
170
171	while (*line) {
172		p = line + strlen(line) - 1;
173		if ((*p == '\n') || (*p == '\r'))
174			*p = 0;
175		else
176			break;
177	}
178}
179
180static char *parse_word(char **buf)
181{
182	char *word, *next;
183
184	word = *buf;
185	if (*word == 0)
186		return 0;
187
188	word = skip_over_blank(word);
189	next = skip_over_word(word);
190	if (*next)
191		*next++ = 0;
192	*buf = next;
193	return word;
194}
195
196static void parse_escape(char *word)
197{
198	char	*p, *q;
199	int	ac, i;
200
201	if (!word)
202		return;
203
204	for (p = word, q = word; *p; p++, q++) {
205		*q = *p;
206		if (*p != '\\')
207			continue;
208		if (*++p == 0)
209			break;
210		if (*p == 't') {
211			*q = '\t';
212			continue;
213		}
214		if (*p == 'n') {
215			*q = '\n';
216			continue;
217		}
218		if (!isdigit(*p)) {
219			*q = *p;
220			continue;
221		}
222		ac = 0;
223		for (i = 0; i < 3; i++, p++) {
224			if (!isdigit(*p))
225				break;
226			ac = (ac * 8) + (*p - '0');
227		}
228		*q = ac;
229		p--;
230	}
231	*q = 0;
232}
233
234static void free_instance(struct fsck_instance *i)
235{
236	if (i->prog)
237		free(i->prog);
238	if (i->device)
239		free(i->device);
240	if (i->base_device)
241		free(i->base_device);
242	free(i);
243	return;
244}
245
246static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
247					const char *type, const char *opts,
248					int freq, int passno)
249{
250	struct fs_info *fs;
251
252	if (!(fs = malloc(sizeof(struct fs_info))))
253		return NULL;
254
255	fs->device = string_copy(device);
256	fs->mountpt = string_copy(mntpnt);
257	fs->type = string_copy(type);
258	fs->opts = string_copy(opts ? opts : "");
259	fs->freq = freq;
260	fs->passno = passno;
261	fs->flags = 0;
262	fs->next = NULL;
263
264	if (!filesys_info)
265		filesys_info = fs;
266	else
267		filesys_last->next = fs;
268	filesys_last = fs;
269
270	return fs;
271}
272
273
274
275static int parse_fstab_line(char *line, struct fs_info **ret_fs)
276{
277	char	*dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
278	struct fs_info *fs;
279
280	*ret_fs = 0;
281	strip_line(line);
282	cp = line;
283
284	device = parse_word(&cp);
285	if (!device || *device == '#')
286		return 0;	/* Ignore blank lines and comments */
287	mntpnt = parse_word(&cp);
288	type = parse_word(&cp);
289	opts = parse_word(&cp);
290	freq = parse_word(&cp);
291	passno = parse_word(&cp);
292
293	if (!mntpnt || !type)
294		return -1;
295
296	parse_escape(device);
297	parse_escape(mntpnt);
298	parse_escape(type);
299	parse_escape(opts);
300	parse_escape(freq);
301	parse_escape(passno);
302
303	dev = blkid_get_devname(cache, device, NULL);
304	if (dev)
305		device = dev;
306
307	if (strchr(type, ','))
308		type = 0;
309
310	fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
311			      freq ? atoi(freq) : -1,
312			      passno ? atoi(passno) : -1);
313	if (dev)
314		free(dev);
315
316	if (!fs)
317		return -1;
318	*ret_fs = fs;
319	return 0;
320}
321
322static void interpret_type(struct fs_info *fs)
323{
324	char	*t;
325
326	if (strcmp(fs->type, "auto") != 0)
327		return;
328	t = blkid_get_tag_value(cache, "TYPE", fs->device);
329	if (t) {
330		free(fs->type);
331		fs->type = t;
332	}
333}
334
335/*
336 * Load the filesystem database from /etc/fstab
337 */
338static void load_fs_info(const char *filename)
339{
340	FILE	*f;
341	char	buf[1024];
342	int	lineno = 0;
343	int	old_fstab = 1;
344	struct fs_info *fs;
345
346	if ((f = fopen(filename, "r")) == NULL) {
347		fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
348			filename, strerror(errno));
349		return;
350	}
351	while (!feof(f)) {
352		lineno++;
353		if (!fgets(buf, sizeof(buf), f))
354			break;
355		buf[sizeof(buf)-1] = 0;
356		if (parse_fstab_line(buf, &fs) < 0) {
357			fprintf(stderr, _("WARNING: bad format "
358				"on line %d of %s\n"), lineno, filename);
359			continue;
360		}
361		if (!fs)
362			continue;
363		if (fs->passno < 0)
364			fs->passno = 0;
365		else
366			old_fstab = 0;
367	}
368
369	fclose(f);
370
371	if (old_fstab && filesys_info) {
372		fputs(_("\007\007\007"
373		"WARNING: Your /etc/fstab does not contain the fsck passno\n"
374		"	field.  I will kludge around things for you, but you\n"
375		"	should fix your /etc/fstab file as soon as you can.\n\n"), stderr);
376
377		for (fs = filesys_info; fs; fs = fs->next) {
378			fs->passno = 1;
379		}
380	}
381}
382
383/* Lookup filesys in /etc/fstab and return the corresponding entry. */
384static struct fs_info *lookup(char *filesys)
385{
386	struct fs_info *fs;
387
388	/* No filesys name given. */
389	if (filesys == NULL)
390		return NULL;
391
392	for (fs = filesys_info; fs; fs = fs->next) {
393		if (!strcmp(filesys, fs->device) ||
394		    (fs->mountpt && !strcmp(filesys, fs->mountpt)))
395			break;
396	}
397
398	return fs;
399}
400
401/* Find fsck program for a given fs type. */
402static char *find_fsck(char *type)
403{
404  char *s;
405  const char *tpl;
406  static char prog[256];
407  char *p = string_copy(fsck_path);
408  struct stat st;
409
410  /* Are we looking for a program or just a type? */
411  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
412
413  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
414	sprintf(prog, tpl, s, type);
415	if (stat(prog, &st) == 0) break;
416  }
417  free(p);
418  return(s ? prog : NULL);
419}
420
421static int progress_active(NOARGS)
422{
423	struct fsck_instance *inst;
424
425	for (inst = instance_list; inst; inst = inst->next) {
426		if (inst->flags & FLAG_DONE)
427			continue;
428		if (inst->flags & FLAG_PROGRESS)
429			return 1;
430	}
431	return 0;
432}
433
434/*
435 * Execute a particular fsck program, and link it into the list of
436 * child processes we are waiting for.
437 */
438static int execute(const char *type, const char *device, const char *mntpt,
439		   int interactive)
440{
441	char *s, *argv[80], prog[80];
442	int  argc, i;
443	struct fsck_instance *inst, *p;
444	pid_t	pid;
445
446	inst = malloc(sizeof(struct fsck_instance));
447	if (!inst)
448		return ENOMEM;
449	memset(inst, 0, sizeof(struct fsck_instance));
450
451	sprintf(prog, "fsck.%s", type);
452	argv[0] = string_copy(prog);
453	argc = 1;
454
455	for (i=0; i <num_args; i++)
456		argv[argc++] = string_copy(args[i]);
457
458	if (progress) {
459		if ((strcmp(type, "ext2") == 0) ||
460		    (strcmp(type, "ext3") == 0) ||
461		    (strcmp(type, "ext4") == 0) ||
462		    (strcmp(type, "ext4dev") == 0)) {
463			char tmp[80];
464
465			tmp[0] = 0;
466			if (!progress_active()) {
467				snprintf(tmp, 80, "-C%d", progress_fd);
468				inst->flags |= FLAG_PROGRESS;
469			} else if (progress_fd)
470				snprintf(tmp, 80, "-C%d", progress_fd * -1);
471			if (tmp[0])
472				argv[argc++] = string_copy(tmp);
473		}
474	}
475
476	argv[argc++] = string_copy(device);
477	argv[argc] = 0;
478
479	s = find_fsck(prog);
480	if (s == NULL) {
481		fprintf(stderr, _("fsck: %s: not found\n"), prog);
482		free(inst);
483		return ENOENT;
484	}
485
486	if (verbose || noexecute) {
487		printf("[%s (%d) -- %s] ", s, num_running,
488		       mntpt ? mntpt : device);
489		for (i=0; i < argc; i++)
490			printf("%s ", argv[i]);
491		printf("\n");
492	}
493
494	/* Fork and execute the correct program. */
495	if (noexecute)
496		pid = -1;
497	else if ((pid = fork()) < 0) {
498		perror("fork");
499		free(inst);
500		return errno;
501	} else if (pid == 0) {
502		if (!interactive)
503			close(0);
504		(void) execv(s, argv);
505		perror(argv[0]);
506		free(inst);
507		exit(EXIT_ERROR);
508	}
509
510	for (i=0; i < argc; i++)
511		free(argv[i]);
512
513	inst->pid = pid;
514	inst->prog = string_copy(prog);
515	inst->type = string_copy(type);
516	inst->device = string_copy(device);
517	inst->base_device = base_device(device);
518	inst->start_time = time(0);
519	inst->next = NULL;
520
521	/*
522	 * Find the end of the list, so we add the instance on at the end.
523	 */
524	for (p = instance_list; p && p->next; p = p->next);
525
526	if (p)
527		p->next = inst;
528	else
529		instance_list = inst;
530
531	return 0;
532}
533
534/*
535 * Send a signal to all outstanding fsck child processes
536 */
537static int kill_all(int signum)
538{
539	struct fsck_instance *inst;
540	int	n = 0;
541
542	for (inst = instance_list; inst; inst = inst->next) {
543		if (inst->flags & FLAG_DONE)
544			continue;
545		kill(inst->pid, signum);
546		n++;
547	}
548	return n;
549}
550
551/*
552 * Wait for one child process to exit; when it does, unlink it from
553 * the list of executing child processes, and return it.
554 */
555static struct fsck_instance *wait_one(int flags)
556{
557	int	status;
558	int	sig;
559	struct fsck_instance *inst, *inst2, *prev;
560	pid_t	pid;
561
562	if (!instance_list)
563		return NULL;
564
565	if (noexecute) {
566		inst = instance_list;
567		prev = 0;
568#ifdef RANDOM_DEBUG
569		while (inst->next && (random() & 1)) {
570			prev = inst;
571			inst = inst->next;
572		}
573#endif
574		inst->exit_status = 0;
575		goto ret_inst;
576	}
577
578	/*
579	 * gcc -Wall fails saving throw against stupidity
580	 * (inst and prev are thought to be uninitialized variables)
581	 */
582	inst = prev = NULL;
583
584	do {
585		pid = waitpid(-1, &status, flags);
586		if (cancel_requested && !kill_sent) {
587			kill_all(SIGTERM);
588			kill_sent++;
589		}
590		if ((pid == 0) && (flags & WNOHANG))
591			return NULL;
592		if (pid < 0) {
593			if ((errno == EINTR) || (errno == EAGAIN))
594				continue;
595			if (errno == ECHILD) {
596				fprintf(stderr,
597					_("%s: wait: No more child process?!?\n"),
598					progname);
599				return NULL;
600			}
601			perror("wait");
602			continue;
603		}
604		for (prev = 0, inst = instance_list;
605		     inst;
606		     prev = inst, inst = inst->next) {
607			if (inst->pid == pid)
608				break;
609		}
610	} while (!inst);
611
612	if (WIFEXITED(status))
613		status = WEXITSTATUS(status);
614	else if (WIFSIGNALED(status)) {
615		sig = WTERMSIG(status);
616		if (sig == SIGINT) {
617			status = EXIT_UNCORRECTED;
618		} else {
619			printf(_("Warning... %s for device %s exited "
620			       "with signal %d.\n"),
621			       inst->prog, inst->device, sig);
622			status = EXIT_ERROR;
623		}
624	} else {
625		printf(_("%s %s: status is %x, should never happen.\n"),
626		       inst->prog, inst->device, status);
627		status = EXIT_ERROR;
628	}
629	inst->exit_status = status;
630	inst->flags |= FLAG_DONE;
631	if (progress && (inst->flags & FLAG_PROGRESS) &&
632	    !progress_active()) {
633		for (inst2 = instance_list; inst2; inst2 = inst2->next) {
634			if (inst2->flags & FLAG_DONE)
635				continue;
636			if (strcmp(inst2->type, "ext2") &&
637			    strcmp(inst2->type, "ext3") &&
638			    strcmp(inst2->type, "ext4") &&
639			    strcmp(inst2->type, "ext4dev"))
640				continue;
641			/*
642			 * If we've just started the fsck, wait a tiny
643			 * bit before sending the kill, to give it
644			 * time to set up the signal handler
645			 */
646			if (inst2->start_time < time(0)+2) {
647				if (fork() == 0) {
648					sleep(1);
649					kill(inst2->pid, SIGUSR1);
650					exit(0);
651				}
652			} else
653				kill(inst2->pid, SIGUSR1);
654			inst2->flags |= FLAG_PROGRESS;
655			break;
656		}
657	}
658ret_inst:
659	if (prev)
660		prev->next = inst->next;
661	else
662		instance_list = inst->next;
663	if (verbose > 1)
664		printf(_("Finished with %s (exit status %d)\n"),
665		       inst->device, inst->exit_status);
666	num_running--;
667	return inst;
668}
669
670#define FLAG_WAIT_ALL		0
671#define FLAG_WAIT_ATLEAST_ONE	1
672/*
673 * Wait until all executing child processes have exited; return the
674 * logical OR of all of their exit code values.
675 */
676static int wait_many(int flags)
677{
678	struct fsck_instance *inst;
679	int	global_status = 0;
680	int	wait_flags = 0;
681
682	while ((inst = wait_one(wait_flags))) {
683		global_status |= inst->exit_status;
684		free_instance(inst);
685#ifdef RANDOM_DEBUG
686		if (noexecute && (flags & WNOHANG) && !(random() % 3))
687			break;
688#endif
689		if (flags & FLAG_WAIT_ATLEAST_ONE)
690			wait_flags = WNOHANG;
691	}
692	return global_status;
693}
694
695/*
696 * Run the fsck program on a particular device
697 *
698 * If the type is specified using -t, and it isn't prefixed with "no"
699 * (as in "noext2") and only one filesystem type is specified, then
700 * use that type regardless of what is specified in /etc/fstab.
701 *
702 * If the type isn't specified by the user, then use either the type
703 * specified in /etc/fstab, or DEFAULT_FSTYPE.
704 */
705static void fsck_device(struct fs_info *fs, int interactive)
706{
707	const char *type;
708	int retval;
709
710	interpret_type(fs);
711
712	if (strcmp(fs->type, "auto") != 0)
713		type = fs->type;
714	else if (fstype && strncmp(fstype, "no", 2) &&
715	    strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
716	    !strchr(fstype, ','))
717		type = fstype;
718	else
719		type = DEFAULT_FSTYPE;
720
721	num_running++;
722	retval = execute(type, fs->device, fs->mountpt, interactive);
723	if (retval) {
724		fprintf(stderr, _("%s: Error %d while executing fsck.%s "
725			"for %s\n"), progname, retval, type, fs->device);
726		num_running--;
727	}
728}
729
730
731/*
732 * Deal with the fsck -t argument.
733 */
734struct fs_type_compile {
735	char **list;
736	int *type;
737	int  negate;
738} fs_type_compiled;
739
740#define FS_TYPE_NORMAL	0
741#define FS_TYPE_OPT	1
742#define FS_TYPE_NEGOPT	2
743
744static const char *fs_type_syntax_error =
745N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
746   "with 'no' or '!'.\n");
747
748static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
749{
750	char 	*cp, *list, *s;
751	int	num = 2;
752	int	negate, first_negate = 1;
753
754	if (fs_type) {
755		for (cp=fs_type; *cp; cp++) {
756			if (*cp == ',')
757				num++;
758		}
759	}
760
761	cmp->list = malloc(num * sizeof(char *));
762	cmp->type = malloc(num * sizeof(int));
763	if (!cmp->list || !cmp->type) {
764		fputs(_("Couldn't allocate memory for filesystem types\n"),
765		      stderr);
766		exit(EXIT_ERROR);
767	}
768	memset(cmp->list, 0, num * sizeof(char *));
769	memset(cmp->type, 0, num * sizeof(int));
770	cmp->negate = 0;
771
772	if (!fs_type)
773		return;
774
775	list = string_copy(fs_type);
776	num = 0;
777	s = strtok(list, ",");
778	while(s) {
779		negate = 0;
780		if (strncmp(s, "no", 2) == 0) {
781			s += 2;
782			negate = 1;
783		} else if (*s == '!') {
784			s++;
785			negate = 1;
786		}
787		if (strcmp(s, "loop") == 0)
788			/* loop is really short-hand for opts=loop */
789			goto loop_special_case;
790		else if (strncmp(s, "opts=", 5) == 0) {
791			s += 5;
792		loop_special_case:
793			cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
794		} else {
795			if (first_negate) {
796				cmp->negate = negate;
797				first_negate = 0;
798			}
799			if ((negate && !cmp->negate) ||
800			    (!negate && cmp->negate)) {
801				fputs(_(fs_type_syntax_error), stderr);
802				exit(EXIT_USAGE);
803			}
804		}
805#if 0
806		printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
807#endif
808	        cmp->list[num++] = string_copy(s);
809		s = strtok(NULL, ",");
810	}
811	free(list);
812}
813
814/*
815 * This function returns true if a particular option appears in a
816 * comma-delimited options list
817 */
818static int opt_in_list(const char *opt, char *optlist)
819{
820	char	*list, *s;
821
822	if (!optlist)
823		return 0;
824	list = string_copy(optlist);
825
826	s = strtok(list, ",");
827	while(s) {
828		if (strcmp(s, opt) == 0) {
829			free(list);
830			return 1;
831		}
832		s = strtok(NULL, ",");
833	}
834        free(list);
835	return 0;
836}
837
838/* See if the filesystem matches the criteria given by the -t option */
839static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
840{
841	int n, ret = 0, checked_type = 0;
842	char *cp;
843
844	if (cmp->list == 0 || cmp->list[0] == 0)
845		return 1;
846
847	for (n=0; (cp = cmp->list[n]); n++) {
848		switch (cmp->type[n]) {
849		case FS_TYPE_NORMAL:
850			checked_type++;
851			if (strcmp(cp, fs->type) == 0) {
852				ret = 1;
853			}
854			break;
855		case FS_TYPE_NEGOPT:
856			if (opt_in_list(cp, fs->opts))
857				return 0;
858			break;
859		case FS_TYPE_OPT:
860			if (!opt_in_list(cp, fs->opts))
861				return 0;
862			break;
863		}
864	}
865	if (checked_type == 0)
866		return 1;
867	return (cmp->negate ? !ret : ret);
868}
869
870/* Check if we should ignore this filesystem. */
871static int ignore(struct fs_info *fs)
872{
873	const char **ip;
874	int wanted = 0;
875
876	/*
877	 * If the pass number is 0, ignore it.
878	 */
879	if (fs->passno == 0)
880		return 1;
881
882	/*
883	 * If this is a bind mount, ignore it.
884	 */
885	if (opt_in_list("bind", fs->opts)) {
886		fprintf(stderr,
887			_("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
888			fs->mountpt);
889		return 1;
890	}
891
892	interpret_type(fs);
893
894	/*
895	 * If a specific fstype is specified, and it doesn't match,
896	 * ignore it.
897	 */
898	if (!fs_match(fs, &fs_type_compiled)) return 1;
899
900	/* Are we ignoring this type? */
901	for(ip = ignored_types; *ip; ip++)
902		if (strcmp(fs->type, *ip) == 0) return 1;
903
904	/* Do we really really want to check this fs? */
905	for(ip = really_wanted; *ip; ip++)
906		if (strcmp(fs->type, *ip) == 0) {
907			wanted = 1;
908			break;
909		}
910
911	/* See if the <fsck.fs> program is available. */
912	if (find_fsck(fs->type) == NULL) {
913		if (wanted)
914			fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
915				fs->device, fs->type);
916		return 1;
917	}
918
919	/* We can and want to check this file system type. */
920	return 0;
921}
922
923/*
924 * Returns TRUE if a partition on the same disk is already being
925 * checked.
926 */
927static int device_already_active(char *device)
928{
929	struct fsck_instance *inst;
930	char *base;
931
932	if (force_all_parallel)
933		return 0;
934
935#ifdef BASE_MD
936	/* Don't check a soft raid disk with any other disk */
937	if (instance_list &&
938	    (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
939	     !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
940		return 1;
941#endif
942
943	base = base_device(device);
944	/*
945	 * If we don't know the base device, assume that the device is
946	 * already active if there are any fsck instances running.
947	 */
948	if (!base)
949		return (instance_list != 0);
950	for (inst = instance_list; inst; inst = inst->next) {
951		if (!inst->base_device || !strcmp(base, inst->base_device)) {
952			free(base);
953			return 1;
954		}
955	}
956	free(base);
957	return 0;
958}
959
960/* Check all file systems, using the /etc/fstab table. */
961static int check_all(NOARGS)
962{
963	struct fs_info *fs = NULL;
964	int status = EXIT_OK;
965	int not_done_yet = 1;
966	int passno = 1;
967	int pass_done;
968
969	if (verbose)
970		fputs(_("Checking all file systems.\n"), stdout);
971
972	/*
973	 * Do an initial scan over the filesystem; mark filesystems
974	 * which should be ignored as done, and resolve any "auto"
975	 * filesystem types (done as a side-effect of calling ignore()).
976	 */
977	for (fs = filesys_info; fs; fs = fs->next) {
978		if (ignore(fs))
979			fs->flags |= FLAG_DONE;
980	}
981
982	/*
983	 * Find and check the root filesystem.
984	 */
985	if (!parallel_root) {
986		for (fs = filesys_info; fs; fs = fs->next) {
987			if (!strcmp(fs->mountpt, "/"))
988				break;
989		}
990		if (fs) {
991			if (!skip_root && !ignore(fs) &&
992			    !(ignore_mounted && is_mounted(fs->device))) {
993				fsck_device(fs, 1);
994				status |= wait_many(FLAG_WAIT_ALL);
995				if (status > EXIT_NONDESTRUCT)
996					return status;
997			}
998			fs->flags |= FLAG_DONE;
999		}
1000	}
1001	/*
1002	 * This is for the bone-headed user who enters the root
1003	 * filesystem twice.  Skip root will skep all root entries.
1004	 */
1005	if (skip_root)
1006		for (fs = filesys_info; fs; fs = fs->next)
1007			if (!strcmp(fs->mountpt, "/"))
1008				fs->flags |= FLAG_DONE;
1009
1010	while (not_done_yet) {
1011		not_done_yet = 0;
1012		pass_done = 1;
1013
1014		for (fs = filesys_info; fs; fs = fs->next) {
1015			if (cancel_requested)
1016				break;
1017			if (fs->flags & FLAG_DONE)
1018				continue;
1019			/*
1020			 * If the filesystem's pass number is higher
1021			 * than the current pass number, then we don't
1022			 * do it yet.
1023			 */
1024			if (fs->passno > passno) {
1025				not_done_yet++;
1026				continue;
1027			}
1028			if (ignore_mounted && is_mounted(fs->device)) {
1029				fs->flags |= FLAG_DONE;
1030				continue;
1031			}
1032			/*
1033			 * If a filesystem on a particular device has
1034			 * already been spawned, then we need to defer
1035			 * this to another pass.
1036			 */
1037			if (device_already_active(fs->device)) {
1038				pass_done = 0;
1039				continue;
1040			}
1041			/*
1042			 * Spawn off the fsck process
1043			 */
1044			fsck_device(fs, serialize);
1045			fs->flags |= FLAG_DONE;
1046
1047			/*
1048			 * Only do one filesystem at a time, or if we
1049			 * have a limit on the number of fsck's extant
1050			 * at one time, apply that limit.
1051			 */
1052			if (serialize ||
1053			    (max_running && (num_running >= max_running))) {
1054				pass_done = 0;
1055				break;
1056			}
1057		}
1058		if (cancel_requested)
1059			break;
1060		if (verbose > 1)
1061			printf(_("--waiting-- (pass %d)\n"), passno);
1062		status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1063				    FLAG_WAIT_ATLEAST_ONE);
1064		if (pass_done) {
1065			if (verbose > 1)
1066				printf("----------------------------------\n");
1067			passno++;
1068		} else
1069			not_done_yet++;
1070	}
1071	if (cancel_requested && !kill_sent) {
1072		kill_all(SIGTERM);
1073		kill_sent++;
1074	}
1075	status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1076	return status;
1077}
1078
1079static void usage(NOARGS)
1080{
1081	fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1082	exit(EXIT_USAGE);
1083}
1084
1085#ifdef HAVE_SIGNAL_H
1086static void signal_cancel(int sig FSCK_ATTR((unused)))
1087{
1088	cancel_requested++;
1089}
1090#endif
1091
1092static void PRS(int argc, char *argv[])
1093{
1094	int	i, j;
1095	char	*arg, *dev, *tmp = 0;
1096	char	options[128];
1097	int	opt = 0;
1098	int     opts_for_fsck = 0;
1099#ifdef HAVE_SIGNAL_H
1100	struct sigaction	sa;
1101
1102	/*
1103	 * Set up signal action
1104	 */
1105	memset(&sa, 0, sizeof(struct sigaction));
1106	sa.sa_handler = signal_cancel;
1107	sigaction(SIGINT, &sa, 0);
1108	sigaction(SIGTERM, &sa, 0);
1109#endif
1110
1111	num_devices = 0;
1112	num_args = 0;
1113	instance_list = 0;
1114
1115	progname = argv[0];
1116
1117	for (i=1; i < argc; i++) {
1118		arg = argv[i];
1119		if (!arg)
1120			continue;
1121		if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1122			if (num_devices >= MAX_DEVICES) {
1123				fprintf(stderr, _("%s: too many devices\n"),
1124					progname);
1125				exit(EXIT_ERROR);
1126			}
1127			dev = blkid_get_devname(cache, arg, NULL);
1128			if (!dev && strchr(arg, '=')) {
1129				/*
1130				 * Check to see if we failed because
1131				 * /proc/partitions isn't found.
1132				 */
1133				if (access("/proc/partitions", R_OK) < 0) {
1134					fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1135						strerror(errno));
1136					fprintf(stderr, "Is /proc mounted?\n");
1137					exit(EXIT_ERROR);
1138				}
1139				/*
1140				 * Check to see if this is because
1141				 * we're not running as root
1142				 */
1143				if (geteuid())
1144					fprintf(stderr,
1145		"Must be root to scan for matching filesystems: %s\n", arg);
1146				else
1147					fprintf(stderr,
1148		"Couldn't find matching filesystem: %s\n", arg);
1149				exit(EXIT_ERROR);
1150			}
1151			devices[num_devices++] = dev ? dev : string_copy(arg);
1152			continue;
1153		}
1154		if (arg[0] != '-' || opts_for_fsck) {
1155			if (num_args >= MAX_ARGS) {
1156				fprintf(stderr, _("%s: too many arguments\n"),
1157					progname);
1158				exit(EXIT_ERROR);
1159			}
1160			args[num_args++] = string_copy(arg);
1161			continue;
1162		}
1163		for (j=1; arg[j]; j++) {
1164			if (opts_for_fsck) {
1165				options[++opt] = arg[j];
1166				continue;
1167			}
1168			switch (arg[j]) {
1169			case 'A':
1170				doall++;
1171				break;
1172			case 'C':
1173				progress++;
1174				if (arg[j+1]) {
1175					progress_fd = string_to_int(arg+j+1);
1176					if (progress_fd < 0)
1177						progress_fd = 0;
1178					else
1179						goto next_arg;
1180				} else if ((i+1) < argc &&
1181					   !strncmp(argv[i+1], "-", 1) == 0) {
1182					progress_fd = string_to_int(argv[i]);
1183					if (progress_fd < 0)
1184						progress_fd = 0;
1185					else {
1186						goto next_arg;
1187						i++;
1188					}
1189				}
1190				break;
1191			case 'V':
1192				verbose++;
1193				break;
1194			case 'N':
1195				noexecute++;
1196				break;
1197			case 'R':
1198				skip_root++;
1199				break;
1200			case 'T':
1201				notitle++;
1202				break;
1203			case 'M':
1204				ignore_mounted++;
1205				break;
1206			case 'P':
1207				parallel_root++;
1208				break;
1209			case 's':
1210				serialize++;
1211				break;
1212			case 't':
1213				tmp = 0;
1214				if (fstype)
1215					usage();
1216				if (arg[j+1])
1217					tmp = arg+j+1;
1218				else if ((i+1) < argc)
1219					tmp = argv[++i];
1220				else
1221					usage();
1222				fstype = string_copy(tmp);
1223				compile_fs_type(fstype, &fs_type_compiled);
1224				goto next_arg;
1225			case '-':
1226				opts_for_fsck++;
1227				break;
1228			case '?':
1229				usage();
1230				break;
1231			default:
1232				options[++opt] = arg[j];
1233				break;
1234			}
1235		}
1236	next_arg:
1237		if (opt) {
1238			options[0] = '-';
1239			options[++opt] = '\0';
1240			if (num_args >= MAX_ARGS) {
1241				fprintf(stderr,
1242					_("%s: too many arguments\n"),
1243					progname);
1244				exit(EXIT_ERROR);
1245			}
1246			args[num_args++] = string_copy(options);
1247			opt = 0;
1248		}
1249	}
1250	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1251		force_all_parallel++;
1252	if ((tmp = getenv("FSCK_MAX_INST")))
1253	    max_running = atoi(tmp);
1254}
1255
1256int main(int argc, char *argv[])
1257{
1258	int i, status = 0;
1259	int interactive = 0;
1260	char *oldpath = getenv("PATH");
1261	const char *fstab;
1262	struct fs_info *fs;
1263
1264	setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1265	setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1266
1267#ifdef ENABLE_NLS
1268	setlocale(LC_MESSAGES, "");
1269	setlocale(LC_CTYPE, "");
1270	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1271	textdomain(NLS_CAT_NAME);
1272#endif
1273	blkid_get_cache(&cache, NULL);
1274	PRS(argc, argv);
1275
1276	if (!notitle)
1277		printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1278
1279	fstab = getenv("FSTAB_FILE");
1280	if (!fstab)
1281		fstab = _PATH_MNTTAB;
1282	load_fs_info(fstab);
1283
1284	/* Update our search path to include uncommon directories. */
1285	if (oldpath) {
1286		fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1287				    strlen (oldpath) + 1);
1288		if (!fsck_path) {
1289			fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1290			exit(EXIT_ERROR);
1291		}
1292		strcpy (fsck_path, fsck_prefix_path);
1293		strcat (fsck_path, ":");
1294		strcat (fsck_path, oldpath);
1295	} else {
1296		fsck_path = string_copy(fsck_prefix_path);
1297	}
1298
1299	if ((num_devices == 1) || (serialize))
1300		interactive = 1;
1301
1302	/* If -A was specified ("check all"), do that! */
1303	if (doall)
1304		return check_all();
1305
1306	if (num_devices == 0) {
1307		serialize++;
1308		interactive++;
1309		return check_all();
1310	}
1311	for (i = 0 ; i < num_devices; i++) {
1312		if (cancel_requested) {
1313			if (!kill_sent) {
1314				kill_all(SIGTERM);
1315				kill_sent++;
1316			}
1317			break;
1318		}
1319		fs = lookup(devices[i]);
1320		if (!fs) {
1321			fs = create_fs_device(devices[i], 0, "auto",
1322					      0, -1, -1);
1323			if (!fs)
1324				continue;
1325		}
1326		if (ignore_mounted && is_mounted(fs->device))
1327			continue;
1328		fsck_device(fs, interactive);
1329		if (serialize ||
1330		    (max_running && (num_running >= max_running))) {
1331			struct fsck_instance *inst;
1332
1333			inst = wait_one(0);
1334			if (inst) {
1335				status |= inst->exit_status;
1336				free_instance(inst);
1337			}
1338			if (verbose > 1)
1339				printf("----------------------------------\n");
1340		}
1341	}
1342	status |= wait_many(FLAG_WAIT_ALL);
1343	free(fsck_path);
1344	blkid_put_cache(cache);
1345	return status;
1346}
1347