fsck.c revision e71d87317ac095fa08079f0cc9040da16952eb93 
1/*
2 * pfsck --- A generic, parallelizing front-end for the fsck program.
3 * It will automatically try to run fsck programs in parallel if the
4 * devices are on separate spindles.  It is based on the same ideas as
5 * the generic front end for fsck by David Engel and Fred van Kempen,
6 * but it has been completely rewritten from scratch to support
7 * parallel execution.
8 *
9 * Written by Theodore Ts'o, <tytso@mit.edu>
10 *
11 * Usage:	fsck [-ACVRNTM] [-s] [-t fstype] [fs-options] device
12 *
13 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
14 *   o Changed -t fstype to behave like with mount when -A (all file
15 *     systems) or -M (like mount) is specified.
16 *   o fsck looks if it can find the fsck.type program to decide
17 *     if it should ignore the fs type. This way more fsck programs
18 *     can be added without changing this front-end.
19 *   o -R flag skip root file system.
20 *
21 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
22 *
23 * %Begin-Header%
24 * This file may be redistributed under the terms of the GNU Public
25 * License.
26 * %End-Header%
27 */
28
29#include <sys/types.h>
30#include <sys/wait.h>
31#include <sys/signal.h>
32#include <sys/stat.h>
33#include <limits.h>
34#include <stdio.h>
35#include <ctype.h>
36#include <string.h>
37#include <time.h>
38#if HAVE_STDLIB_H
39#include <stdlib.h>
40#endif
41#if HAVE_ERRNO_H
42#include <errno.h>
43#endif
44#if HAVE_PATHS_H
45#include <paths.h>
46#endif
47#if HAVE_UNISTD_H
48#include <unistd.h>
49#endif
50#if HAVE_ERRNO_H
51#include <errno.h>
52#endif
53#if HAVE_MALLOC_H
54#include <malloc.h>
55#endif
56
57#include "../version.h"
58#include "nls-enable.h"
59#include "fsck.h"
60#include "blkid/blkid.h"
61
62#ifndef _PATH_MNTTAB
63#define	_PATH_MNTTAB	"/etc/fstab"
64#endif
65
66static const char *ignored_types[] = {
67	"ignore",
68	"iso9660",
69	"nfs",
70	"proc",
71	"sw",
72	"swap",
73	NULL
74};
75
76static const char *really_wanted[] = {
77	"minix",
78	"ext2",
79	"ext3",
80	"xiafs",
81	NULL
82};
83
84#define BASE_MD "/dev/md"
85
86/*
87 * Global variables for options
88 */
89char *devices[MAX_DEVICES];
90char *args[MAX_ARGS];
91int num_devices, num_args;
92
93int verbose = 0;
94int doall = 0;
95int noexecute = 0;
96int serialize = 0;
97int skip_root = 0;
98int like_mount = 0;
99int notitle = 0;
100int parallel_root = 0;
101int progress = 0;
102int force_all_parallel = 0;
103int num_running = 0;
104int max_running = 0;
105volatile int cancel_requested = 0;
106int kill_sent = 0;
107char *progname;
108char *fstype = NULL;
109struct fs_info *filesys_info = NULL, *filesys_last = NULL;
110struct fsck_instance *instance_list;
111const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
112char *fsck_path = 0;
113blkid_cache cache = NULL;
114
115static char *string_copy(const char *s)
116{
117	char	*ret;
118
119	if (!s)
120		return 0;
121	ret = malloc(strlen(s)+1);
122	if (ret)
123		strcpy(ret, s);
124	return ret;
125}
126
127static int ignore(struct fs_info *);
128
129static char *skip_over_blank(char *cp)
130{
131	while (*cp && isspace(*cp))
132		cp++;
133	return cp;
134}
135
136static char *skip_over_word(char *cp)
137{
138	while (*cp && !isspace(*cp))
139		cp++;
140	return cp;
141}
142
143static void strip_line(char *line)
144{
145	char	*p;
146
147	while (*line) {
148		p = line + strlen(line) - 1;
149		if ((*p == '\n') || (*p == '\r'))
150			*p = 0;
151		else
152			break;
153	}
154}
155
156static char *parse_word(char **buf)
157{
158	char *word, *next;
159
160	word = *buf;
161	if (*word == 0)
162		return 0;
163
164	word = skip_over_blank(word);
165	next = skip_over_word(word);
166	if (*next)
167		*next++ = 0;
168	*buf = next;
169	return word;
170}
171
172static void parse_escape(char *word)
173{
174	char	*p, *q;
175	int	ac, i;
176
177	if (!word)
178		return;
179
180	for (p = word, q = word; *p; p++, q++) {
181		*q = *p;
182		if (*p != '\\')
183			continue;
184		if (*++p == 0)
185			break;
186		if (*p == 't') {
187			*q = '\t';
188			continue;
189		}
190		if (*p == 'n') {
191			*q = '\n';
192			continue;
193		}
194		if (!isdigit(*p)) {
195			*q = *p;
196			continue;
197		}
198		ac = 0;
199		for (i = 0; i < 3; i++, p++) {
200			if (!isdigit(*p))
201				break;
202			ac = (ac * 8) + (*p - '0');
203		}
204		*q = ac;
205		p--;
206	}
207	*q = 0;
208}
209
210static void free_instance(struct fsck_instance *i)
211{
212	if (i->prog)
213		free(i->prog);
214	if (i->device)
215		free(i->device);
216	if (i->base_device)
217		free(i->base_device);
218	free(i);
219	return;
220}
221
222static struct fs_info *create_fs_device(char *device, char *mntpnt,
223					char *type, char *opts, int freq,
224					int passno)
225{
226	struct fs_info *fs;
227
228	if (!(fs = malloc(sizeof(struct fs_info))))
229		return NULL;
230
231	fs->device = string_copy(device);
232	fs->mountpt = string_copy(mntpnt);
233	fs->type = string_copy(type);
234	fs->opts = string_copy(opts ? opts : "");
235	fs->freq = freq;
236	fs->passno = passno;
237	fs->flags = 0;
238	fs->next = NULL;
239
240	if (!filesys_info)
241		filesys_info = fs;
242	else
243		filesys_last->next = fs;
244	filesys_last = fs;
245
246	return fs;
247}
248
249
250
251static int parse_fstab_line(char *line, struct fs_info **ret_fs)
252{
253	char	*dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
254	char	*t = NULL;
255	struct fs_info *fs;
256
257	*ret_fs = 0;
258	strip_line(line);
259	if ((cp = strchr(line, '#')))
260		*cp = 0;	/* Ignore everything after the comment char */
261	cp = line;
262
263	device = parse_word(&cp);
264	mntpnt = parse_word(&cp);
265	type = parse_word(&cp);
266	opts = parse_word(&cp);
267	freq = parse_word(&cp);
268	passno = parse_word(&cp);
269
270	if (!device)
271		return 0;	/* Allow blank lines */
272
273	if (!mntpnt || !type)
274		return -1;
275
276	parse_escape(device);
277	parse_escape(mntpnt);
278	parse_escape(type);
279	parse_escape(opts);
280	parse_escape(freq);
281	parse_escape(passno);
282
283	dev = blkid_get_devname(cache, device, NULL);
284	if (dev)
285		device = dev;
286
287	if (strcmp(type, "auto") == 0 || (strchr(type, ',') != 0))
288		t = blkid_get_tag_value(cache, "TYPE", device);
289	if (t)
290		type = t;
291
292	fs = create_fs_device(device, mntpnt, type, opts,
293			      freq ? atoi(freq) : -1,
294			      passno ? atoi(passno) : -1);
295	if (dev)
296		free(dev);
297	if (t)
298		free(t);
299
300	if (!fs)
301		return -1;
302	*ret_fs = fs;
303	return 0;
304}
305
306/*
307 * Load the filesystem database from /etc/fstab
308 */
309static void load_fs_info(const char *filename)
310{
311	FILE	*f;
312	char	buf[1024];
313	int	lineno = 0;
314	int	old_fstab = 1;
315	struct fs_info *fs;
316
317	if ((f = fopen(filename, "r")) == NULL) {
318		fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
319			filename, strerror(errno));
320		return;
321	}
322	while (!feof(f)) {
323		lineno++;
324		if (!fgets(buf, sizeof(buf), f))
325			break;
326		buf[sizeof(buf)-1] = 0;
327		if (parse_fstab_line(buf, &fs) < 0) {
328			fprintf(stderr, _("WARNING: bad format "
329				"on line %d of %s\n"), lineno, filename);
330			continue;
331		}
332		if (!fs)
333			continue;
334		if (fs->passno < 0)
335			fs->passno = 0;
336		else
337			old_fstab = 0;
338	}
339
340	fclose(f);
341
342	if (old_fstab) {
343		fprintf(stderr, _("\007\007\007"
344		"WARNING: Your /etc/fstab does not contain the fsck passno\n"
345		"	field.  I will kludge around things for you, but you\n"
346		"	should fix your /etc/fstab file as soon as you can.\n\n"));
347
348		for (fs = filesys_info; fs; fs = fs->next) {
349			fs->passno = 1;
350		}
351	}
352}
353
354/* Lookup filesys in /etc/fstab and return the corresponding entry. */
355static struct fs_info *lookup(char *filesys)
356{
357	struct fs_info *fs;
358	int	try_again = 0;
359
360	/* No filesys name given. */
361	if (filesys == NULL)
362		return NULL;
363
364	for (fs = filesys_info; fs; fs = fs->next) {
365		if (!strcmp(filesys, fs->device) ||
366		    (fs->mountpt && !strcmp(filesys, fs->mountpt)))
367			break;
368	}
369
370	return fs;
371}
372
373/* Find fsck program for a given fs type. */
374static char *find_fsck(char *type)
375{
376  char *s;
377  const char *tpl;
378  static char prog[256];
379  char *p = string_copy(fsck_path);
380  struct stat st;
381
382  /* Are we looking for a program or just a type? */
383  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
384
385  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
386	sprintf(prog, tpl, s, type);
387	if (stat(prog, &st) == 0) break;
388  }
389  free(p);
390  return(s ? prog : NULL);
391}
392
393static int progress_active(NOARGS)
394{
395	struct fsck_instance *inst;
396
397	for (inst = instance_list; inst; inst = inst->next) {
398		if (inst->flags & FLAG_DONE)
399			continue;
400		if (inst->flags & FLAG_PROGRESS)
401			return 1;
402	}
403	return 0;
404}
405
406/*
407 * Execute a particular fsck program, and link it into the list of
408 * child processes we are waiting for.
409 */
410static int execute(const char *type, const char *device, const char *mntpt,
411		   int interactive)
412{
413	char *s, *argv[80], prog[80];
414	int  argc, i;
415	struct fsck_instance *inst, *p;
416	pid_t	pid;
417
418	inst = malloc(sizeof(struct fsck_instance));
419	if (!inst)
420		return ENOMEM;
421	memset(inst, 0, sizeof(struct fsck_instance));
422
423	sprintf(prog, "fsck.%s", type);
424	argv[0] = string_copy(prog);
425	argc = 1;
426
427	for (i=0; i <num_args; i++)
428		argv[argc++] = string_copy(args[i]);
429
430	if (progress & !progress_active()) {
431		if ((strcmp(type, "ext2") == 0) ||
432		    (strcmp(type, "ext3") == 0)) {
433			argv[argc++] = string_copy("-C0");
434			inst->flags |= FLAG_PROGRESS;
435		}
436	}
437
438	argv[argc++] = string_copy(device);
439	argv[argc] = 0;
440
441	s = find_fsck(prog);
442	if (s == NULL) {
443		fprintf(stderr, _("fsck: %s: not found\n"), prog);
444		return ENOENT;
445	}
446
447	if (verbose || noexecute) {
448		printf("[%s (%d) -- %s] ", s, num_running,
449		       mntpt ? mntpt : device);
450		for (i=0; i < argc; i++)
451			printf("%s ", argv[i]);
452		printf("\n");
453	}
454
455	/* Fork and execute the correct program. */
456	if (noexecute)
457		pid = -1;
458	else if ((pid = fork()) < 0) {
459		perror("fork");
460		return errno;
461	} else if (pid == 0) {
462		if (!interactive)
463			close(0);
464		(void) execv(s, argv);
465		perror(argv[0]);
466		exit(EXIT_ERROR);
467	}
468
469	for (i=0; i < argc; i++)
470		free(argv[i]);
471
472	inst->pid = pid;
473	inst->prog = string_copy(prog);
474	inst->type = string_copy(type);
475	inst->device = string_copy(device);
476	inst->base_device = base_device(device);
477	inst->start_time = time(0);
478	inst->next = NULL;
479
480	/*
481	 * Find the end of the list, so we add the instance on at the end.
482	 */
483	for (p = instance_list; p && p->next; p = p->next);
484
485	if (p)
486		p->next = inst;
487	else
488		instance_list = inst;
489
490	return 0;
491}
492
493/*
494 * Send a signal to all outstanding fsck child processes
495 */
496static int kill_all(int signum)
497{
498	struct fsck_instance *inst;
499	int	n = 0;
500
501	for (inst = instance_list; inst; inst = inst->next) {
502		if (inst->flags & FLAG_DONE)
503			continue;
504		kill(inst->pid, signum);
505		n++;
506	}
507	return n;
508}
509
510/*
511 * Wait for one child process to exit; when it does, unlink it from
512 * the list of executing child processes, and return it.
513 */
514static struct fsck_instance *wait_one(int flags)
515{
516	int	status;
517	int	sig;
518	struct fsck_instance *inst, *inst2, *prev;
519	pid_t	pid;
520
521	if (!instance_list)
522		return NULL;
523
524	if (noexecute) {
525		inst = instance_list;
526		prev = 0;
527#ifdef RANDOM_DEBUG
528		while (inst->next && (random() & 1)) {
529			prev = inst;
530			inst = inst->next;
531		}
532#endif
533		inst->exit_status = 0;
534		goto ret_inst;
535	}
536
537	/*
538	 * gcc -Wall fails saving throw against stupidity
539	 * (inst and prev are thought to be uninitialized variables)
540	 */
541	inst = prev = NULL;
542
543	do {
544		pid = waitpid(-1, &status, flags);
545		if (cancel_requested && !kill_sent) {
546			kill_all(SIGTERM);
547			kill_sent++;
548		}
549		if ((pid == 0) && (flags & WNOHANG))
550			return NULL;
551		if (pid < 0) {
552			if ((errno == EINTR) || (errno == EAGAIN))
553				continue;
554			if (errno == ECHILD) {
555				fprintf(stderr,
556					_("%s: wait: No more child process?!?\n"),
557					progname);
558				return NULL;
559			}
560			perror("wait");
561			continue;
562		}
563		for (prev = 0, inst = instance_list;
564		     inst;
565		     prev = inst, inst = inst->next) {
566			if (inst->pid == pid)
567				break;
568		}
569	} while (!inst);
570
571	if (WIFEXITED(status))
572		status = WEXITSTATUS(status);
573	else if (WIFSIGNALED(status)) {
574		sig = WTERMSIG(status);
575		if (sig == SIGINT) {
576			status = EXIT_UNCORRECTED;
577		} else {
578			printf(_("Warning... %s for device %s exited "
579			       "with signal %d.\n"),
580			       inst->prog, inst->device, sig);
581			status = EXIT_ERROR;
582		}
583	} else {
584		printf(_("%s %s: status is %x, should never happen.\n"),
585		       inst->prog, inst->device, status);
586		status = EXIT_ERROR;
587	}
588	inst->exit_status = status;
589	if (progress && (inst->flags & FLAG_PROGRESS) &&
590	    !progress_active()) {
591		for (inst2 = instance_list; inst2; inst2 = inst2->next) {
592			if (inst2->flags & FLAG_DONE)
593				continue;
594			if (strcmp(inst2->type, "ext2") &&
595			    strcmp(inst2->type, "ext3"))
596				continue;
597			/*
598			 * If we've just started the fsck, wait a tiny
599			 * bit before sending the kill, to give it
600			 * time to set up the signal handler
601			 */
602			if (inst2->start_time < time(0)+2) {
603				if (fork() == 0) {
604					sleep(1);
605					kill(inst2->pid, SIGUSR1);
606					exit(0);
607				}
608			} else
609				kill(inst2->pid, SIGUSR1);
610			inst2->flags |= FLAG_PROGRESS;
611			break;
612		}
613	}
614ret_inst:
615	if (prev)
616		prev->next = inst->next;
617	else
618		instance_list = inst->next;
619	if (verbose > 1)
620		printf(_("Finished with %s (exit status %d)\n"),
621		       inst->device, inst->exit_status);
622	num_running--;
623	return inst;
624}
625
626/*
627 * Wait until all executing child processes have exited; return the
628 * logical OR of all of their exit code values.
629 */
630static int wait_all(int flags)
631{
632	struct fsck_instance *inst;
633	int	global_status = 0;
634
635	while ((inst = wait_one(flags))) {
636		global_status |= inst->exit_status;
637		free_instance(inst);
638#ifdef RANDOM_DEBUG
639		if (noexecute && (flags & WNOHANG) && !(random() % 3))
640			break;
641#endif
642	}
643	return global_status;
644}
645
646/*
647 * Run the fsck program on a particular device
648 *
649 * If the type is specified using -t, and it isn't prefixed with "no"
650 * (as in "noext2") and only one filesystem type is specified, then
651 * use that type regardless of what is specified in /etc/fstab.
652 *
653 * If the type isn't specified by the user, then use either the type
654 * specified in /etc/fstab, or DEFAULT_FSTYPE.
655 */
656static void fsck_device(struct fs_info *fs, int interactive)
657{
658	const char *type = 0;
659	int retval;
660
661	if (fstype && strncmp(fstype, "no", 2) &&
662	    strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
663	    !strchr(fstype, ','))
664		type = fstype;
665
666	type = fs->type ? fs->type : DEFAULT_FSTYPE;
667
668	num_running++;
669	retval = execute(type, fs->device, fs->mountpt, interactive);
670	if (retval) {
671		fprintf(stderr, _("%s: Error %d while executing fsck.%s "
672			"for %s\n"), progname, retval, type, fs->device);
673		num_running--;
674	}
675}
676
677
678/*
679 * Deal with the fsck -t argument.
680 */
681struct fs_type_compile {
682	char **list;
683	int *type;
684	int  negate;
685} fs_type_compiled;
686
687#define FS_TYPE_NORMAL	0
688#define FS_TYPE_OPT	1
689#define FS_TYPE_NEGOPT	2
690
691static const char *fs_type_syntax_error =
692N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
693   "with 'no' or '!'.\n");
694
695static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
696{
697	char 	*cp, *list, *s;
698	int	num = 2;
699	int	negate, first_negate = 1;
700
701	if (fs_type) {
702		for (cp=fs_type; *cp; cp++) {
703			if (*cp == ',')
704				num++;
705		}
706	}
707
708	cmp->list = malloc(num * sizeof(char *));
709	cmp->type = malloc(num * sizeof(int));
710	if (!cmp->list || !cmp->type) {
711		fprintf(stderr, _("Couldn't allocate memory for "
712				  "filesystem types\n"));
713		exit(EXIT_ERROR);
714	}
715	memset(cmp->list, 0, num * sizeof(char *));
716	memset(cmp->type, 0, num * sizeof(int));
717	cmp->negate = 0;
718
719	if (!fs_type)
720		return;
721
722	list = string_copy(fs_type);
723	num = 0;
724	s = strtok(list, ",");
725	while(s) {
726		negate = 0;
727		if (strncmp(s, "no", 2) == 0) {
728			s += 2;
729			negate = 1;
730		} else if (*s == '!') {
731			s++;
732			negate = 1;
733		}
734		if (strcmp(s, "loop") == 0)
735			/* loop is really short-hand for opts=loop */
736			goto loop_special_case;
737		else if (strncmp(s, "opts=", 5) == 0) {
738			s += 5;
739		loop_special_case:
740			cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
741		} else {
742			if (first_negate) {
743				cmp->negate = negate;
744				first_negate = 0;
745			}
746			if ((negate && !cmp->negate) ||
747			    (!negate && cmp->negate)) {
748				fprintf(stderr, _(fs_type_syntax_error));
749				exit(EXIT_USAGE);
750			}
751		}
752#if 0
753		printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
754#endif
755	        cmp->list[num++] = string_copy(s);
756		s = strtok(NULL, ",");
757	}
758	free(list);
759}
760
761/*
762 * This function returns true if a particular option appears in a
763 * comma-delimited options list
764 */
765static int opt_in_list(char *opt, char *optlist)
766{
767	char	*list, *s;
768
769	if (!optlist)
770		return 0;
771	list = string_copy(optlist);
772
773	s = strtok(list, ",");
774	while(s) {
775		if (strcmp(s, opt) == 0) {
776			free(list);
777			return 1;
778		}
779		s = strtok(NULL, ",");
780	}
781        free(list);
782	return 0;
783}
784
785/* See if the filesystem matches the criteria given by the -t option */
786static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
787{
788	int n, ret = 0, checked_type = 0;
789	char *cp;
790
791	if (cmp->list == 0 || cmp->list[0] == 0)
792		return 1;
793
794	for (n=0; (cp = cmp->list[n]); n++) {
795		switch (cmp->type[n]) {
796		case FS_TYPE_NORMAL:
797			checked_type++;
798			if (strcmp(cp, fs->type) == 0) {
799				ret = 1;
800			}
801			break;
802		case FS_TYPE_NEGOPT:
803			if (opt_in_list(cp, fs->opts))
804				return 0;
805			break;
806		case FS_TYPE_OPT:
807			if (!opt_in_list(cp, fs->opts))
808				return 0;
809			break;
810		}
811	}
812	if (checked_type == 0)
813		return 1;
814	return (cmp->negate ? !ret : ret);
815}
816
817/* Check if we should ignore this filesystem. */
818static int ignore(struct fs_info *fs)
819{
820	const char **ip;
821	int wanted = 0;
822
823	/*
824	 * If the pass number is 0, ignore it.
825	 */
826	if (fs->passno == 0)
827		return 1;
828
829	/*
830	 * If a specific fstype is specified, and it doesn't match,
831	 * ignore it.
832	 */
833	if (!fs_match(fs, &fs_type_compiled)) return 1;
834
835	/* Are we ignoring this type? */
836	for(ip = ignored_types; *ip; ip++)
837		if (strcmp(fs->type, *ip) == 0) return 1;
838
839	/* Do we really really want to check this fs? */
840	for(ip = really_wanted; *ip; ip++)
841		if (strcmp(fs->type, *ip) == 0) {
842			wanted = 1;
843			break;
844		}
845
846	/* See if the <fsck.fs> program is available. */
847	if (find_fsck(fs->type) == NULL) {
848		if (wanted)
849			fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
850				fs->device, fs->type);
851		return 1;
852	}
853
854	/* We can and want to check this file system type. */
855	return 0;
856}
857
858/*
859 * Returns TRUE if a partition on the same disk is already being
860 * checked.
861 */
862static int device_already_active(char *device)
863{
864	struct fsck_instance *inst;
865	char *base;
866
867	if (force_all_parallel)
868		return 0;
869
870#ifdef BASE_MD
871	/* Don't check a soft raid disk with any other disk */
872	if (instance_list &&
873	    (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
874	     !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
875		return 1;
876#endif
877
878	base = base_device(device);
879	/*
880	 * If we don't know the base device, assume that the device is
881	 * already active if there are any fsck instances running.
882	 */
883	if (!base)
884		return (instance_list != 0);
885	for (inst = instance_list; inst; inst = inst->next) {
886		if (!inst->base_device || !strcmp(base, inst->base_device)) {
887			free(base);
888			return 1;
889		}
890	}
891	free(base);
892	return 0;
893}
894
895/* Check all file systems, using the /etc/fstab table. */
896static int check_all(NOARGS)
897{
898	struct fs_info *fs = NULL;
899	int status = EXIT_OK;
900	int not_done_yet = 1;
901	int passno = 1;
902	int pass_done;
903
904	if (verbose)
905		printf(_("Checking all file systems.\n"));
906
907	/*
908	 * Do an initial scan over the filesystem; mark filesystems
909	 * which should be ignored as done, and resolve LABEL= and
910	 * UUID= specifications to the real device.
911	 */
912	for (fs = filesys_info; fs; fs = fs->next) {
913		if (ignore(fs))
914			fs->flags |= FLAG_DONE;
915	}
916
917	/*
918	 * Find and check the root filesystem.
919	 */
920	if (!parallel_root) {
921		for (fs = filesys_info; fs; fs = fs->next) {
922			if (!strcmp(fs->mountpt, "/"))
923				break;
924		}
925		if (fs) {
926			if (!skip_root && !ignore(fs)) {
927				fsck_device(fs, 1);
928				status |= wait_all(0);
929				if (status > EXIT_NONDESTRUCT)
930					return status;
931			}
932			fs->flags |= FLAG_DONE;
933		}
934	}
935	/*
936	 * This is for the bone-headed user who enters the root
937	 * filesystem twice.  Skip root will skep all root entries.
938	 */
939	if (skip_root)
940		for (fs = filesys_info; fs; fs = fs->next)
941			if (!strcmp(fs->mountpt, "/"))
942				fs->flags |= FLAG_DONE;
943
944	while (not_done_yet) {
945		not_done_yet = 0;
946		pass_done = 1;
947
948		for (fs = filesys_info; fs; fs = fs->next) {
949			if (cancel_requested)
950				break;
951			if (fs->flags & FLAG_DONE)
952				continue;
953			/*
954			 * If the filesystem's pass number is higher
955			 * than the current pass number, then we don't
956			 * do it yet.
957			 */
958			if (fs->passno > passno) {
959				not_done_yet++;
960				continue;
961			}
962			/*
963			 * If a filesystem on a particular device has
964			 * already been spawned, then we need to defer
965			 * this to another pass.
966			 */
967			if (device_already_active(fs->device)) {
968				pass_done = 0;
969				continue;
970			}
971			/*
972			 * Spawn off the fsck process
973			 */
974			fsck_device(fs, serialize);
975			fs->flags |= FLAG_DONE;
976
977			/*
978			 * Only do one filesystem at a time, or if we
979			 * have a limit on the number of fsck's extant
980			 * at one time, apply that limit.
981			 */
982			if (serialize ||
983			    (max_running && (num_running >= max_running))) {
984				pass_done = 0;
985				break;
986			}
987		}
988		if (cancel_requested)
989			break;
990		if (verbose > 1)
991			printf(_("--waiting-- (pass %d)\n"), passno);
992		status |= wait_all(pass_done ? 0 : WNOHANG);
993		if (pass_done) {
994			if (verbose > 1)
995				printf("----------------------------------\n");
996			passno++;
997		} else
998			not_done_yet++;
999	}
1000	if (cancel_requested && !kill_sent) {
1001		kill_all(SIGTERM);
1002		kill_sent++;
1003	}
1004	status |= wait_all(0);
1005	return status;
1006}
1007
1008static void usage(NOARGS)
1009{
1010	fprintf(stderr,
1011		_("Usage: fsck [-ACNPRTV] [-t fstype] [fs-options] [filesys ...]\n"));
1012	exit(EXIT_USAGE);
1013}
1014
1015#ifdef HAVE_SIGNAL_H
1016static void signal_cancel(int sig)
1017{
1018	cancel_requested++;
1019}
1020#endif
1021
1022static void PRS(int argc, char *argv[])
1023{
1024	int	i, j;
1025	char	*arg, *dev, *tmp = 0;
1026	char	options[128];
1027	int	opt = 0;
1028	int     opts_for_fsck = 0;
1029#ifdef HAVE_SIGNAL_H
1030	struct sigaction	sa;
1031
1032	/*
1033	 * Set up signal action
1034	 */
1035	memset(&sa, 0, sizeof(struct sigaction));
1036	sa.sa_handler = signal_cancel;
1037	sigaction(SIGINT, &sa, 0);
1038	sigaction(SIGTERM, &sa, 0);
1039#endif
1040
1041	num_devices = 0;
1042	num_args = 0;
1043	instance_list = 0;
1044
1045	progname = argv[0];
1046
1047	for (i=1; i < argc; i++) {
1048		arg = argv[i];
1049		if (!arg)
1050			continue;
1051		if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1052			if (num_devices >= MAX_DEVICES) {
1053				fprintf(stderr, _("%s: too many devices\n"),
1054					progname);
1055				exit(EXIT_ERROR);
1056			}
1057			dev = blkid_get_devname(cache, arg, NULL);
1058			if (!dev && strchr(arg, '=')) {
1059				/*
1060				 * Check to see if we failed because
1061				 * /proc/partitions isn't found.
1062				 */
1063				if (access("/proc/partitions", R_OK) < 0) {
1064					fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1065						strerror(errno));
1066					fprintf(stderr, "Is /proc mounted?\n");
1067					exit(EXIT_ERROR);
1068				}
1069				/*
1070				 * Check to see if this is because
1071				 * we're not running as root
1072				 */
1073				if (geteuid())
1074					fprintf(stderr,
1075		"Must be root to scan for matching filesystems: %s\n", arg);
1076				else
1077					fprintf(stderr,
1078		"Couldn't find matching filesystem: %s\n", arg);
1079				exit(EXIT_ERROR);
1080			}
1081			devices[num_devices++] = dev ? dev : string_copy(arg);
1082			continue;
1083		}
1084		if (arg[0] != '-' || opts_for_fsck) {
1085			if (num_args >= MAX_ARGS) {
1086				fprintf(stderr, _("%s: too many arguments\n"),
1087					progname);
1088				exit(EXIT_ERROR);
1089			}
1090			args[num_args++] = string_copy(arg);
1091			continue;
1092		}
1093		for (j=1; arg[j]; j++) {
1094			if (opts_for_fsck) {
1095				options[++opt] = arg[j];
1096				continue;
1097			}
1098			switch (arg[j]) {
1099			case 'A':
1100				doall++;
1101				break;
1102			case 'C':
1103				progress++;
1104				break;
1105			case 'V':
1106				verbose++;
1107				break;
1108			case 'N':
1109				noexecute++;
1110				break;
1111			case 'R':
1112				skip_root++;
1113				break;
1114			case 'T':
1115				notitle++;
1116				break;
1117			case 'M':
1118				like_mount++;
1119				break;
1120			case 'P':
1121				parallel_root++;
1122				break;
1123			case 's':
1124				serialize++;
1125				break;
1126			case 't':
1127				if (fstype)
1128					usage();
1129				if (arg[j+1])
1130					tmp = arg+j+1;
1131				else if ((i+1) < argc)
1132					tmp = argv[++i];
1133				else
1134					usage();
1135				fstype = string_copy(tmp);
1136				compile_fs_type(fstype, &fs_type_compiled);
1137				goto next_arg;
1138			case '-':
1139				opts_for_fsck++;
1140				break;
1141			case '?':
1142				usage();
1143				break;
1144			default:
1145				options[++opt] = arg[j];
1146				break;
1147			}
1148		}
1149	next_arg:
1150		if (opt) {
1151			options[0] = '-';
1152			options[++opt] = '\0';
1153			if (num_args >= MAX_ARGS) {
1154				fprintf(stderr,
1155					_("%s: too many arguments\n"),
1156					progname);
1157				exit(EXIT_ERROR);
1158			}
1159			args[num_args++] = string_copy(options);
1160			opt = 0;
1161		}
1162	}
1163	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1164		force_all_parallel++;
1165	if ((tmp = getenv("FSCK_MAX_INST")))
1166	    max_running = atoi(tmp);
1167}
1168
1169int main(int argc, char *argv[])
1170{
1171	int i, status = 0;
1172	int interactive = 0;
1173	char *type, *oldpath = getenv("PATH");
1174	const char *fstab;
1175	struct fs_info *fs;
1176
1177#ifdef ENABLE_NLS
1178	setlocale(LC_MESSAGES, "");
1179	setlocale(LC_CTYPE, "");
1180	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1181	textdomain(NLS_CAT_NAME);
1182#endif
1183	blkid_get_cache(&cache, NULL);
1184	PRS(argc, argv);
1185
1186	if (!notitle)
1187		printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1188
1189	fstab = getenv("FSTAB_FILE");
1190	if (!fstab)
1191		fstab = _PATH_MNTTAB;
1192	load_fs_info(fstab);
1193
1194	/* Update our search path to include uncommon directories. */
1195	if (oldpath) {
1196		fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1197				    strlen (oldpath) + 1);
1198		strcpy (fsck_path, fsck_prefix_path);
1199		strcat (fsck_path, ":");
1200		strcat (fsck_path, oldpath);
1201	} else {
1202		fsck_path = string_copy(fsck_prefix_path);
1203	}
1204
1205	if ((num_devices == 1) || (serialize))
1206		interactive = 1;
1207
1208	/* If -A was specified ("check all"), do that! */
1209	if (doall)
1210		return check_all();
1211
1212	if (num_devices == 0) {
1213		serialize++;
1214		interactive++;
1215		return check_all();
1216	}
1217	for (i = 0 ; i < num_devices; i++) {
1218		if (cancel_requested) {
1219			if (!kill_sent) {
1220				kill_all(SIGTERM);
1221				kill_sent++;
1222			}
1223			break;
1224		}
1225		fs = lookup(devices[i]);
1226		if (!fs) {
1227			type = blkid_get_tag_value(cache, "TYPE", devices[i]);
1228			if (!type) {
1229				fprintf(stderr, _("Could not determine "
1230						  "filesystem type for %s\n"),
1231					devices[i]);
1232				continue;
1233			}
1234			fs = create_fs_device(devices[i], 0, type, 0, -1, -1);
1235			free(type);
1236			if (!fs)
1237				continue;
1238		}
1239		fsck_device(fs, interactive);
1240		if (serialize ||
1241		    (max_running && (num_running >= max_running))) {
1242			struct fsck_instance *inst;
1243
1244			inst = wait_one(0);
1245			if (inst) {
1246				status |= inst->exit_status;
1247				free_instance(inst);
1248			}
1249			if (verbose > 1)
1250				printf("----------------------------------\n");
1251		}
1252	}
1253	status |= wait_all(0);
1254	free(fsck_path);
1255	blkid_put_cache(cache);
1256	return status;
1257}
1258