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