fsck.c revision 3fcd8fe8acb269598390b35bbf6e4247d10bc64e 
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 "config.h"
31#include <sys/types.h>
32#include <sys/wait.h>
33#include <sys/signal.h>
34#include <sys/stat.h>
35#include <limits.h>
36#include <stdio.h>
37#include <ctype.h>
38#include <string.h>
39#include <time.h>
40#if HAVE_STDLIB_H
41#include <stdlib.h>
42#endif
43#if HAVE_ERRNO_H
44#include <errno.h>
45#endif
46#if HAVE_PATHS_H
47#include <paths.h>
48#endif
49#if HAVE_UNISTD_H
50#include <unistd.h>
51#endif
52#if HAVE_ERRNO_H
53#include <errno.h>
54#endif
55#if HAVE_MALLOC_H
56#include <malloc.h>
57#endif
58#ifdef HAVE_SIGNAL_H
59#include <signal.h>
60#endif
61
62#include "../version.h"
63#include "nls-enable.h"
64#include "fsck.h"
65#include "blkid/blkid.h"
66
67#ifndef _PATH_MNTTAB
68#define	_PATH_MNTTAB	"/etc/fstab"
69#endif
70
71static const char *ignored_types[] = {
72	"ignore",
73	"iso9660",
74	"nfs",
75	"proc",
76	"sw",
77	"swap",
78	"tmpfs",
79	"devpts",
80	NULL
81};
82
83static const char *really_wanted[] = {
84	"minix",
85	"ext2",
86	"ext3",
87	"ext4",
88	"ext4dev",
89	"jfs",
90	"reiserfs",
91	"xiafs",
92	"xfs",
93	NULL
94};
95
96#define BASE_MD "/dev/md"
97
98/*
99 * Global variables for options
100 */
101char *devices[MAX_DEVICES];
102char *args[MAX_ARGS];
103int num_devices, num_args;
104
105int verbose = 0;
106int doall = 0;
107int noexecute = 0;
108int serialize = 0;
109int skip_root = 0;
110int ignore_mounted = 0;
111int notitle = 0;
112int parallel_root = 0;
113int progress = 0;
114int progress_fd = 0;
115int force_all_parallel = 0;
116int num_running = 0;
117int max_running = 0;
118volatile int cancel_requested = 0;
119int kill_sent = 0;
120char *progname;
121char *fstype = NULL;
122struct fs_info *filesys_info = NULL, *filesys_last = NULL;
123struct fsck_instance *instance_list;
124const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
125char *fsck_path = 0;
126blkid_cache cache = NULL;
127
128static char *string_copy(const char *s)
129{
130	char	*ret;
131
132	if (!s)
133		return 0;
134	ret = malloc(strlen(s)+1);
135	if (ret)
136		strcpy(ret, s);
137	return ret;
138}
139
140static int string_to_int(const char *s)
141{
142	long l;
143	char *p;
144
145	l = strtol(s, &p, 0);
146	if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
147		return -1;
148	else
149		return (int) l;
150}
151
152static int ignore(struct fs_info *);
153
154static char *skip_over_blank(char *cp)
155{
156	while (*cp && isspace(*cp))
157		cp++;
158	return cp;
159}
160
161static char *skip_over_word(char *cp)
162{
163	while (*cp && !isspace(*cp))
164		cp++;
165	return cp;
166}
167
168static void strip_line(char *line)
169{
170	char	*p;
171
172	while (*line) {
173		p = line + strlen(line) - 1;
174		if ((*p == '\n') || (*p == '\r'))
175			*p = 0;
176		else
177			break;
178	}
179}
180
181static char *parse_word(char **buf)
182{
183	char *word, *next;
184
185	word = *buf;
186	if (*word == 0)
187		return 0;
188
189	word = skip_over_blank(word);
190	next = skip_over_word(word);
191	if (*next)
192		*next++ = 0;
193	*buf = next;
194	return word;
195}
196
197static void parse_escape(char *word)
198{
199	char	*p, *q;
200	int	ac, i;
201
202	if (!word)
203		return;
204
205	for (p = word, q = word; *p; p++, q++) {
206		*q = *p;
207		if (*p != '\\')
208			continue;
209		if (*++p == 0)
210			break;
211		if (*p == 't') {
212			*q = '\t';
213			continue;
214		}
215		if (*p == 'n') {
216			*q = '\n';
217			continue;
218		}
219		if (!isdigit(*p)) {
220			*q = *p;
221			continue;
222		}
223		ac = 0;
224		for (i = 0; i < 3; i++, p++) {
225			if (!isdigit(*p))
226				break;
227			ac = (ac * 8) + (*p - '0');
228		}
229		*q = ac;
230		p--;
231	}
232	*q = 0;
233}
234
235static void free_instance(struct fsck_instance *i)
236{
237	free(i->prog);
238	free(i->device);
239	free(i->base_device);
240	free(i);
241	return;
242}
243
244static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
245					const char *type, const char *opts,
246					int freq, int passno)
247{
248	struct fs_info *fs;
249
250	if (!(fs = malloc(sizeof(struct fs_info))))
251		return NULL;
252
253	fs->device = string_copy(device);
254	fs->mountpt = string_copy(mntpnt);
255	fs->type = string_copy(type);
256	fs->opts = string_copy(opts ? opts : "");
257	fs->freq = freq;
258	fs->passno = passno;
259	fs->flags = 0;
260	fs->next = NULL;
261
262	if (!filesys_info)
263		filesys_info = fs;
264	else
265		filesys_last->next = fs;
266	filesys_last = fs;
267
268	return fs;
269}
270
271
272
273static int parse_fstab_line(char *line, struct fs_info **ret_fs)
274{
275	char	*dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
276	struct fs_info *fs;
277
278	*ret_fs = 0;
279	strip_line(line);
280	cp = line;
281
282	device = parse_word(&cp);
283	if (!device || *device == '#')
284		return 0;	/* Ignore blank lines and comments */
285	mntpnt = parse_word(&cp);
286	type = parse_word(&cp);
287	opts = parse_word(&cp);
288	freq = parse_word(&cp);
289	passno = parse_word(&cp);
290
291	if (!mntpnt || !type)
292		return -1;
293
294	parse_escape(device);
295	parse_escape(mntpnt);
296	parse_escape(type);
297	parse_escape(opts);
298	parse_escape(freq);
299	parse_escape(passno);
300
301	dev = blkid_get_devname(cache, device, NULL);
302	if (dev)
303		device = dev;
304
305	if (strchr(type, ','))
306		type = 0;
307
308	fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
309			      freq ? atoi(freq) : -1,
310			      passno ? atoi(passno) : -1);
311	free(dev);
312
313	if (!fs)
314		return -1;
315	*ret_fs = fs;
316	return 0;
317}
318
319static void interpret_type(struct fs_info *fs)
320{
321	char	*t;
322
323	if (strcmp(fs->type, "auto") != 0)
324		return;
325	t = blkid_get_tag_value(cache, "TYPE", fs->device);
326	if (t) {
327		free(fs->type);
328		fs->type = t;
329	}
330}
331
332/*
333 * Load the filesystem database from /etc/fstab
334 */
335static void load_fs_info(const char *filename)
336{
337	FILE	*f;
338	char	buf[1024];
339	int	lineno = 0;
340	int	old_fstab = 1;
341	struct fs_info *fs;
342
343	if ((f = fopen(filename, "r")) == NULL) {
344		fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
345			filename, strerror(errno));
346		return;
347	}
348	while (!feof(f)) {
349		lineno++;
350		if (!fgets(buf, sizeof(buf), f))
351			break;
352		buf[sizeof(buf)-1] = 0;
353		if (parse_fstab_line(buf, &fs) < 0) {
354			fprintf(stderr, _("WARNING: bad format "
355				"on line %d of %s\n"), lineno, filename);
356			continue;
357		}
358		if (!fs)
359			continue;
360		if (fs->passno < 0)
361			fs->passno = 0;
362		else
363			old_fstab = 0;
364	}
365
366	fclose(f);
367
368	if (old_fstab && filesys_info) {
369		fputs("\007\007\007", stderr);
370		fputs(_(
371		"WARNING: Your /etc/fstab does not contain the fsck passno\n"
372		"	field.  I will kludge around things for you, but you\n"
373		"	should fix your /etc/fstab file as soon as you can.\n\n"), stderr);
374
375		for (fs = filesys_info; fs; fs = fs->next) {
376			fs->passno = 1;
377		}
378	}
379}
380
381/* Lookup filesys in /etc/fstab and return the corresponding entry. */
382static struct fs_info *lookup(char *filesys)
383{
384	struct fs_info *fs;
385
386	/* No filesys name given. */
387	if (filesys == NULL)
388		return NULL;
389
390	for (fs = filesys_info; fs; fs = fs->next) {
391		if (!strcmp(filesys, fs->device) ||
392		    (fs->mountpt && !strcmp(filesys, fs->mountpt)))
393			break;
394	}
395
396	return fs;
397}
398
399/* Find fsck program for a given fs type. */
400static char *find_fsck(char *type)
401{
402  char *s;
403  const char *tpl;
404  static char prog[256];
405  char *p = string_copy(fsck_path);
406  struct stat st;
407
408  /* Are we looking for a program or just a type? */
409  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
410
411  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
412	sprintf(prog, tpl, s, type);
413	if (stat(prog, &st) == 0) break;
414  }
415  free(p);
416  return(s ? prog : NULL);
417}
418
419static int progress_active(NOARGS)
420{
421	struct fsck_instance *inst;
422
423	for (inst = instance_list; inst; inst = inst->next) {
424		if (inst->flags & FLAG_DONE)
425			continue;
426		if (inst->flags & FLAG_PROGRESS)
427			return 1;
428	}
429	return 0;
430}
431
432/*
433 * Execute a particular fsck program, and link it into the list of
434 * child processes we are waiting for.
435 */
436static int execute(const char *type, const char *device, const char *mntpt,
437		   int interactive)
438{
439	char *s, *argv[80], prog[80];
440	int  argc, i;
441	struct fsck_instance *inst, *p;
442	pid_t	pid;
443
444	inst = malloc(sizeof(struct fsck_instance));
445	if (!inst)
446		return ENOMEM;
447	memset(inst, 0, sizeof(struct fsck_instance));
448
449	sprintf(prog, "fsck.%s", type);
450	argv[0] = string_copy(prog);
451	argc = 1;
452
453	for (i=0; i <num_args; i++)
454		argv[argc++] = string_copy(args[i]);
455
456	if (progress) {
457		if ((strcmp(type, "ext2") == 0) ||
458		    (strcmp(type, "ext3") == 0) ||
459		    (strcmp(type, "ext4") == 0) ||
460		    (strcmp(type, "ext4dev") == 0)) {
461			char tmp[80];
462
463			tmp[0] = 0;
464			if (!progress_active()) {
465				snprintf(tmp, 80, "-C%d", progress_fd);
466				inst->flags |= FLAG_PROGRESS;
467			} else if (progress_fd)
468				snprintf(tmp, 80, "-C%d", progress_fd * -1);
469			if (tmp[0])
470				argv[argc++] = string_copy(tmp);
471		}
472	}
473
474	argv[argc++] = string_copy(device);
475	argv[argc] = 0;
476
477	s = find_fsck(prog);
478	if (s == NULL) {
479		fprintf(stderr, _("fsck: %s: not found\n"), prog);
480		free(inst);
481		return ENOENT;
482	}
483
484	if (verbose || noexecute) {
485		printf("[%s (%d) -- %s] ", s, num_running,
486		       mntpt ? mntpt : device);
487		for (i=0; i < argc; i++)
488			printf("%s ", argv[i]);
489		printf("\n");
490	}
491
492	/* Fork and execute the correct program. */
493	if (noexecute)
494		pid = -1;
495	else if ((pid = fork()) < 0) {
496		perror("fork");
497		free(inst);
498		return errno;
499	} else if (pid == 0) {
500		if (!interactive)
501			close(0);
502		(void) execv(s, argv);
503		perror(argv[0]);
504		free(inst);
505		exit(EXIT_ERROR);
506	}
507
508	for (i=0; i < argc; i++)
509		free(argv[i]);
510
511	inst->pid = pid;
512	inst->prog = string_copy(prog);
513	inst->type = string_copy(type);
514	inst->device = string_copy(device);
515	inst->base_device = base_device(device);
516	inst->start_time = time(0);
517	inst->next = NULL;
518
519	/*
520	 * Find the end of the list, so we add the instance on at the end.
521	 */
522	for (p = instance_list; p && p->next; p = p->next);
523
524	if (p)
525		p->next = inst;
526	else
527		instance_list = inst;
528
529	return 0;
530}
531
532/*
533 * Send a signal to all outstanding fsck child processes
534 */
535static int kill_all(int signum)
536{
537	struct fsck_instance *inst;
538	int	n = 0;
539
540	for (inst = instance_list; inst; inst = inst->next) {
541		if (inst->flags & FLAG_DONE)
542			continue;
543		kill(inst->pid, signum);
544		n++;
545	}
546	return n;
547}
548
549/*
550 * Wait for one child process to exit; when it does, unlink it from
551 * the list of executing child processes, and return it.
552 */
553static struct fsck_instance *wait_one(int flags)
554{
555	int	status;
556	int	sig;
557	struct fsck_instance *inst, *inst2, *prev;
558	pid_t	pid;
559
560	if (!instance_list)
561		return NULL;
562
563	if (noexecute) {
564		inst = instance_list;
565		prev = 0;
566#ifdef RANDOM_DEBUG
567		while (inst->next && (random() & 1)) {
568			prev = inst;
569			inst = inst->next;
570		}
571#endif
572		inst->exit_status = 0;
573		goto ret_inst;
574	}
575
576	/*
577	 * gcc -Wall fails saving throw against stupidity
578	 * (inst and prev are thought to be uninitialized variables)
579	 */
580	inst = prev = NULL;
581
582	do {
583		pid = waitpid(-1, &status, flags);
584		if (cancel_requested && !kill_sent) {
585			kill_all(SIGTERM);
586			kill_sent++;
587		}
588		if ((pid == 0) && (flags & WNOHANG))
589			return NULL;
590		if (pid < 0) {
591			if ((errno == EINTR) || (errno == EAGAIN))
592				continue;
593			if (errno == ECHILD) {
594				fprintf(stderr,
595					_("%s: wait: No more child process?!?\n"),
596					progname);
597				return NULL;
598			}
599			perror("wait");
600			continue;
601		}
602		for (prev = 0, inst = instance_list;
603		     inst;
604		     prev = inst, inst = inst->next) {
605			if (inst->pid == pid)
606				break;
607		}
608	} while (!inst);
609
610	if (WIFEXITED(status))
611		status = WEXITSTATUS(status);
612	else if (WIFSIGNALED(status)) {
613		sig = WTERMSIG(status);
614		if (sig == SIGINT) {
615			status = EXIT_UNCORRECTED;
616		} else {
617			printf(_("Warning... %s for device %s exited "
618			       "with signal %d.\n"),
619			       inst->prog, inst->device, sig);
620			status = EXIT_ERROR;
621		}
622	} else {
623		printf(_("%s %s: status is %x, should never happen.\n"),
624		       inst->prog, inst->device, status);
625		status = EXIT_ERROR;
626	}
627	inst->exit_status = status;
628	inst->flags |= FLAG_DONE;
629	if (progress && (inst->flags & FLAG_PROGRESS) &&
630	    !progress_active()) {
631		for (inst2 = instance_list; inst2; inst2 = inst2->next) {
632			if (inst2->flags & FLAG_DONE)
633				continue;
634			if (strcmp(inst2->type, "ext2") &&
635			    strcmp(inst2->type, "ext3") &&
636			    strcmp(inst2->type, "ext4") &&
637			    strcmp(inst2->type, "ext4dev"))
638				continue;
639			/*
640			 * If we've just started the fsck, wait a tiny
641			 * bit before sending the kill, to give it
642			 * time to set up the signal handler
643			 */
644			if (inst2->start_time < time(0)+2) {
645				if (fork() == 0) {
646					sleep(1);
647					kill(inst2->pid, SIGUSR1);
648					exit(0);
649				}
650			} else
651				kill(inst2->pid, SIGUSR1);
652			inst2->flags |= FLAG_PROGRESS;
653			break;
654		}
655	}
656ret_inst:
657	if (prev)
658		prev->next = inst->next;
659	else
660		instance_list = inst->next;
661	if (verbose > 1)
662		printf(_("Finished with %s (exit status %d)\n"),
663		       inst->device, inst->exit_status);
664	num_running--;
665	return inst;
666}
667
668#define FLAG_WAIT_ALL		0
669#define FLAG_WAIT_ATLEAST_ONE	1
670/*
671 * Wait until all executing child processes have exited; return the
672 * logical OR of all of their exit code values.
673 */
674static int wait_many(int flags)
675{
676	struct fsck_instance *inst;
677	int	global_status = 0;
678	int	wait_flags = 0;
679
680	while ((inst = wait_one(wait_flags))) {
681		global_status |= inst->exit_status;
682		free_instance(inst);
683#ifdef RANDOM_DEBUG
684		if (noexecute && (flags & WNOHANG) && !(random() % 3))
685			break;
686#endif
687		if (flags & FLAG_WAIT_ATLEAST_ONE)
688			wait_flags = WNOHANG;
689	}
690	return global_status;
691}
692
693/*
694 * Run the fsck program on a particular device
695 *
696 * If the type is specified using -t, and it isn't prefixed with "no"
697 * (as in "noext2") and only one filesystem type is specified, then
698 * use that type regardless of what is specified in /etc/fstab.
699 *
700 * If the type isn't specified by the user, then use either the type
701 * specified in /etc/fstab, or DEFAULT_FSTYPE.
702 */
703static void fsck_device(struct fs_info *fs, int interactive)
704{
705	const char *type;
706	int retval;
707
708	interpret_type(fs);
709
710	if (strcmp(fs->type, "auto") != 0)
711		type = fs->type;
712	else if (fstype && strncmp(fstype, "no", 2) &&
713	    strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
714	    !strchr(fstype, ','))
715		type = fstype;
716	else
717		type = DEFAULT_FSTYPE;
718
719	num_running++;
720	retval = execute(type, fs->device, fs->mountpt, interactive);
721	if (retval) {
722		fprintf(stderr, _("%s: Error %d while executing fsck.%s "
723			"for %s\n"), progname, retval, type, fs->device);
724		num_running--;
725	}
726}
727
728
729/*
730 * Deal with the fsck -t argument.
731 */
732struct fs_type_compile {
733	char **list;
734	int *type;
735	int  negate;
736} fs_type_compiled;
737
738#define FS_TYPE_NORMAL	0
739#define FS_TYPE_OPT	1
740#define FS_TYPE_NEGOPT	2
741
742static const char *fs_type_syntax_error =
743N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
744   "with 'no' or '!'.\n");
745
746static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
747{
748	char 	*cp, *list, *s;
749	int	num = 2;
750	int	negate, first_negate = 1;
751
752	if (fs_type) {
753		for (cp=fs_type; *cp; cp++) {
754			if (*cp == ',')
755				num++;
756		}
757	}
758
759	cmp->list = malloc(num * sizeof(char *));
760	cmp->type = malloc(num * sizeof(int));
761	if (!cmp->list || !cmp->type) {
762		fputs(_("Couldn't allocate memory for filesystem types\n"),
763		      stderr);
764		exit(EXIT_ERROR);
765	}
766	memset(cmp->list, 0, num * sizeof(char *));
767	memset(cmp->type, 0, num * sizeof(int));
768	cmp->negate = 0;
769
770	if (!fs_type)
771		return;
772
773	list = string_copy(fs_type);
774	num = 0;
775	s = strtok(list, ",");
776	while(s) {
777		negate = 0;
778		if (strncmp(s, "no", 2) == 0) {
779			s += 2;
780			negate = 1;
781		} else if (*s == '!') {
782			s++;
783			negate = 1;
784		}
785		if (strcmp(s, "loop") == 0)
786			/* loop is really short-hand for opts=loop */
787			goto loop_special_case;
788		else if (strncmp(s, "opts=", 5) == 0) {
789			s += 5;
790		loop_special_case:
791			cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
792		} else {
793			if (first_negate) {
794				cmp->negate = negate;
795				first_negate = 0;
796			}
797			if ((negate && !cmp->negate) ||
798			    (!negate && cmp->negate)) {
799				fputs(_(fs_type_syntax_error), stderr);
800				exit(EXIT_USAGE);
801			}
802		}
803#if 0
804		printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
805#endif
806	        cmp->list[num++] = string_copy(s);
807		s = strtok(NULL, ",");
808	}
809	free(list);
810}
811
812/*
813 * This function returns true if a particular option appears in a
814 * comma-delimited options list
815 */
816static int opt_in_list(const char *opt, char *optlist)
817{
818	char	*list, *s;
819
820	if (!optlist)
821		return 0;
822	list = string_copy(optlist);
823
824	s = strtok(list, ",");
825	while(s) {
826		if (strcmp(s, opt) == 0) {
827			free(list);
828			return 1;
829		}
830		s = strtok(NULL, ",");
831	}
832        free(list);
833	return 0;
834}
835
836/* See if the filesystem matches the criteria given by the -t option */
837static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
838{
839	int n, ret = 0, checked_type = 0;
840	char *cp;
841
842	if (cmp->list == 0 || cmp->list[0] == 0)
843		return 1;
844
845	for (n=0; (cp = cmp->list[n]); n++) {
846		switch (cmp->type[n]) {
847		case FS_TYPE_NORMAL:
848			checked_type++;
849			if (strcmp(cp, fs->type) == 0) {
850				ret = 1;
851			}
852			break;
853		case FS_TYPE_NEGOPT:
854			if (opt_in_list(cp, fs->opts))
855				return 0;
856			break;
857		case FS_TYPE_OPT:
858			if (!opt_in_list(cp, fs->opts))
859				return 0;
860			break;
861		}
862	}
863	if (checked_type == 0)
864		return 1;
865	return (cmp->negate ? !ret : ret);
866}
867
868/* Check if we should ignore this filesystem. */
869static int ignore(struct fs_info *fs)
870{
871	const char **ip;
872	int wanted = 0;
873
874	/*
875	 * If the pass number is 0, ignore it.
876	 */
877	if (fs->passno == 0)
878		return 1;
879
880	/*
881	 * If this is a bind mount, ignore it.
882	 */
883	if (opt_in_list("bind", fs->opts)) {
884		fprintf(stderr,
885			_("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
886			fs->mountpt);
887		return 1;
888	}
889
890	interpret_type(fs);
891
892	/*
893	 * If a specific fstype is specified, and it doesn't match,
894	 * ignore it.
895	 */
896	if (!fs_match(fs, &fs_type_compiled)) return 1;
897
898	/* Are we ignoring this type? */
899	for(ip = ignored_types; *ip; ip++)
900		if (strcmp(fs->type, *ip) == 0) return 1;
901
902	/* Do we really really want to check this fs? */
903	for(ip = really_wanted; *ip; ip++)
904		if (strcmp(fs->type, *ip) == 0) {
905			wanted = 1;
906			break;
907		}
908
909	/* See if the <fsck.fs> program is available. */
910	if (find_fsck(fs->type) == NULL) {
911		if (wanted)
912			fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
913				fs->device, fs->type);
914		return 1;
915	}
916
917	/* We can and want to check this file system type. */
918	return 0;
919}
920
921/*
922 * Returns TRUE if a partition on the same disk is already being
923 * checked.
924 */
925static int device_already_active(char *device)
926{
927	struct fsck_instance *inst;
928	char *base;
929
930	if (force_all_parallel)
931		return 0;
932
933#ifdef BASE_MD
934	/* Don't check a soft raid disk with any other disk */
935	if (instance_list &&
936	    (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
937	     !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
938		return 1;
939#endif
940
941	base = base_device(device);
942	/*
943	 * If we don't know the base device, assume that the device is
944	 * already active if there are any fsck instances running.
945	 */
946	if (!base)
947		return (instance_list != 0);
948	for (inst = instance_list; inst; inst = inst->next) {
949		if (!inst->base_device || !strcmp(base, inst->base_device)) {
950			free(base);
951			return 1;
952		}
953	}
954	free(base);
955	return 0;
956}
957
958/* Check all file systems, using the /etc/fstab table. */
959static int check_all(NOARGS)
960{
961	struct fs_info *fs = NULL;
962	int status = EXIT_OK;
963	int not_done_yet = 1;
964	int passno = 1;
965	int pass_done;
966
967	if (verbose)
968		fputs(_("Checking all file systems.\n"), stdout);
969
970	/*
971	 * Do an initial scan over the filesystem; mark filesystems
972	 * which should be ignored as done, and resolve any "auto"
973	 * filesystem types (done as a side-effect of calling ignore()).
974	 */
975	for (fs = filesys_info; fs; fs = fs->next) {
976		if (ignore(fs))
977			fs->flags |= FLAG_DONE;
978	}
979
980	/*
981	 * Find and check the root filesystem.
982	 */
983	if (!parallel_root) {
984		for (fs = filesys_info; fs; fs = fs->next) {
985			if (!strcmp(fs->mountpt, "/"))
986				break;
987		}
988		if (fs) {
989			if (!skip_root && !ignore(fs) &&
990			    !(ignore_mounted && is_mounted(fs->device))) {
991				fsck_device(fs, 1);
992				status |= wait_many(FLAG_WAIT_ALL);
993				if (status > EXIT_NONDESTRUCT)
994					return status;
995			}
996			fs->flags |= FLAG_DONE;
997		}
998	}
999	/*
1000	 * This is for the bone-headed user who enters the root
1001	 * filesystem twice.  Skip root will skep all root entries.
1002	 */
1003	if (skip_root)
1004		for (fs = filesys_info; fs; fs = fs->next)
1005			if (!strcmp(fs->mountpt, "/"))
1006				fs->flags |= FLAG_DONE;
1007
1008	while (not_done_yet) {
1009		not_done_yet = 0;
1010		pass_done = 1;
1011
1012		for (fs = filesys_info; fs; fs = fs->next) {
1013			if (cancel_requested)
1014				break;
1015			if (fs->flags & FLAG_DONE)
1016				continue;
1017			/*
1018			 * If the filesystem's pass number is higher
1019			 * than the current pass number, then we don't
1020			 * do it yet.
1021			 */
1022			if (fs->passno > passno) {
1023				not_done_yet++;
1024				continue;
1025			}
1026			if (ignore_mounted && is_mounted(fs->device)) {
1027				fs->flags |= FLAG_DONE;
1028				continue;
1029			}
1030			/*
1031			 * If a filesystem on a particular device has
1032			 * already been spawned, then we need to defer
1033			 * this to another pass.
1034			 */
1035			if (device_already_active(fs->device)) {
1036				pass_done = 0;
1037				continue;
1038			}
1039			/*
1040			 * Spawn off the fsck process
1041			 */
1042			fsck_device(fs, serialize);
1043			fs->flags |= FLAG_DONE;
1044
1045			/*
1046			 * Only do one filesystem at a time, or if we
1047			 * have a limit on the number of fsck's extant
1048			 * at one time, apply that limit.
1049			 */
1050			if (serialize ||
1051			    (max_running && (num_running >= max_running))) {
1052				pass_done = 0;
1053				break;
1054			}
1055		}
1056		if (cancel_requested)
1057			break;
1058		if (verbose > 1)
1059			printf(_("--waiting-- (pass %d)\n"), passno);
1060		status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1061				    FLAG_WAIT_ATLEAST_ONE);
1062		if (pass_done) {
1063			if (verbose > 1)
1064				printf("----------------------------------\n");
1065			passno++;
1066		} else
1067			not_done_yet++;
1068	}
1069	if (cancel_requested && !kill_sent) {
1070		kill_all(SIGTERM);
1071		kill_sent++;
1072	}
1073	status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1074	return status;
1075}
1076
1077static void usage(NOARGS)
1078{
1079	fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1080	exit(EXIT_USAGE);
1081}
1082
1083#ifdef HAVE_SIGNAL_H
1084static void signal_cancel(int sig FSCK_ATTR((unused)))
1085{
1086	cancel_requested++;
1087}
1088#endif
1089
1090static void PRS(int argc, char *argv[])
1091{
1092	int	i, j;
1093	char	*arg, *dev, *tmp = 0;
1094	char	options[128];
1095	int	opt = 0;
1096	int     opts_for_fsck = 0;
1097#ifdef HAVE_SIGNAL_H
1098	struct sigaction	sa;
1099
1100	/*
1101	 * Set up signal action
1102	 */
1103	memset(&sa, 0, sizeof(struct sigaction));
1104	sa.sa_handler = signal_cancel;
1105	sigaction(SIGINT, &sa, 0);
1106	sigaction(SIGTERM, &sa, 0);
1107#endif
1108
1109	num_devices = 0;
1110	num_args = 0;
1111	instance_list = 0;
1112
1113	progname = argv[0];
1114
1115	for (i=1; i < argc; i++) {
1116		arg = argv[i];
1117		if (!arg)
1118			continue;
1119		if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1120			if (num_devices >= MAX_DEVICES) {
1121				fprintf(stderr, _("%s: too many devices\n"),
1122					progname);
1123				exit(EXIT_ERROR);
1124			}
1125			dev = blkid_get_devname(cache, arg, NULL);
1126			if (!dev && strchr(arg, '=')) {
1127				/*
1128				 * Check to see if we failed because
1129				 * /proc/partitions isn't found.
1130				 */
1131				if (access("/proc/partitions", R_OK) < 0) {
1132					fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1133						strerror(errno));
1134					fprintf(stderr, "Is /proc mounted?\n");
1135					exit(EXIT_ERROR);
1136				}
1137				/*
1138				 * Check to see if this is because
1139				 * we're not running as root
1140				 */
1141				if (geteuid())
1142					fprintf(stderr,
1143		"Must be root to scan for matching filesystems: %s\n", arg);
1144				else
1145					fprintf(stderr,
1146		"Couldn't find matching filesystem: %s\n", arg);
1147				exit(EXIT_ERROR);
1148			}
1149			devices[num_devices++] = dev ? dev : string_copy(arg);
1150			continue;
1151		}
1152		if (arg[0] != '-' || opts_for_fsck) {
1153			if (num_args >= MAX_ARGS) {
1154				fprintf(stderr, _("%s: too many arguments\n"),
1155					progname);
1156				exit(EXIT_ERROR);
1157			}
1158			args[num_args++] = string_copy(arg);
1159			continue;
1160		}
1161		for (j=1; arg[j]; j++) {
1162			if (opts_for_fsck) {
1163				options[++opt] = arg[j];
1164				continue;
1165			}
1166			switch (arg[j]) {
1167			case 'A':
1168				doall++;
1169				break;
1170			case 'C':
1171				progress++;
1172				if (arg[j+1]) {
1173					progress_fd = string_to_int(arg+j+1);
1174					if (progress_fd < 0)
1175						progress_fd = 0;
1176					else
1177						goto next_arg;
1178				} else if ((i+1) < argc &&
1179					   !strncmp(argv[i+1], "-", 1) == 0) {
1180					progress_fd = string_to_int(argv[i]);
1181					if (progress_fd < 0)
1182						progress_fd = 0;
1183					else {
1184						++i;
1185						goto next_arg;
1186					}
1187				}
1188				break;
1189			case 'V':
1190				verbose++;
1191				break;
1192			case 'N':
1193				noexecute++;
1194				break;
1195			case 'R':
1196				skip_root++;
1197				break;
1198			case 'T':
1199				notitle++;
1200				break;
1201			case 'M':
1202				ignore_mounted++;
1203				break;
1204			case 'P':
1205				parallel_root++;
1206				break;
1207			case 's':
1208				serialize++;
1209				break;
1210			case 't':
1211				tmp = 0;
1212				if (fstype)
1213					usage();
1214				if (arg[j+1])
1215					tmp = arg+j+1;
1216				else if ((i+1) < argc)
1217					tmp = argv[++i];
1218				else
1219					usage();
1220				fstype = string_copy(tmp);
1221				compile_fs_type(fstype, &fs_type_compiled);
1222				goto next_arg;
1223			case '-':
1224				opts_for_fsck++;
1225				break;
1226			case '?':
1227				usage();
1228				break;
1229			default:
1230				options[++opt] = arg[j];
1231				break;
1232			}
1233		}
1234	next_arg:
1235		if (opt) {
1236			options[0] = '-';
1237			options[++opt] = '\0';
1238			if (num_args >= MAX_ARGS) {
1239				fprintf(stderr,
1240					_("%s: too many arguments\n"),
1241					progname);
1242				exit(EXIT_ERROR);
1243			}
1244			args[num_args++] = string_copy(options);
1245			opt = 0;
1246		}
1247	}
1248	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1249		force_all_parallel++;
1250	if ((tmp = getenv("FSCK_MAX_INST")))
1251	    max_running = atoi(tmp);
1252}
1253
1254int main(int argc, char *argv[])
1255{
1256	int i, status = 0;
1257	int interactive = 0;
1258	char *oldpath = getenv("PATH");
1259	const char *fstab;
1260	struct fs_info *fs;
1261
1262	setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1263	setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1264
1265#ifdef ENABLE_NLS
1266	setlocale(LC_MESSAGES, "");
1267	setlocale(LC_CTYPE, "");
1268	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1269	textdomain(NLS_CAT_NAME);
1270#endif
1271	blkid_get_cache(&cache, NULL);
1272	PRS(argc, argv);
1273
1274	if (!notitle)
1275		printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1276
1277	fstab = getenv("FSTAB_FILE");
1278	if (!fstab)
1279		fstab = _PATH_MNTTAB;
1280	load_fs_info(fstab);
1281
1282	/* Update our search path to include uncommon directories. */
1283	if (oldpath) {
1284		fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1285				    strlen (oldpath) + 1);
1286		if (!fsck_path) {
1287			fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1288			exit(EXIT_ERROR);
1289		}
1290		strcpy (fsck_path, fsck_prefix_path);
1291		strcat (fsck_path, ":");
1292		strcat (fsck_path, oldpath);
1293	} else {
1294		fsck_path = string_copy(fsck_prefix_path);
1295	}
1296
1297	if ((num_devices == 1) || (serialize))
1298		interactive = 1;
1299
1300	/* If -A was specified ("check all"), do that! */
1301	if (doall)
1302		return check_all();
1303
1304	if (num_devices == 0) {
1305		serialize++;
1306		interactive++;
1307		return check_all();
1308	}
1309	for (i = 0 ; i < num_devices; i++) {
1310		if (cancel_requested) {
1311			if (!kill_sent) {
1312				kill_all(SIGTERM);
1313				kill_sent++;
1314			}
1315			break;
1316		}
1317		fs = lookup(devices[i]);
1318		if (!fs) {
1319			fs = create_fs_device(devices[i], 0, "auto",
1320					      0, -1, -1);
1321			if (!fs)
1322				continue;
1323		}
1324		if (ignore_mounted && is_mounted(fs->device))
1325			continue;
1326		fsck_device(fs, interactive);
1327		if (serialize ||
1328		    (max_running && (num_running >= max_running))) {
1329			struct fsck_instance *inst;
1330
1331			inst = wait_one(0);
1332			if (inst) {
1333				status |= inst->exit_status;
1334				free_instance(inst);
1335			}
1336			if (verbose > 1)
1337				printf("----------------------------------\n");
1338		}
1339	}
1340	status |= wait_many(FLAG_WAIT_ALL);
1341	free(fsck_path);
1342	blkid_put_cache(cache);
1343	return status;
1344}
1345