fsck.c revision 5e38fed9c5e5c0741ff00fc7001b44a075bfb64c 
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	"tmpfs",
74	"devpts",
75	NULL
76};
77
78static const char *really_wanted[] = {
79	"minix",
80	"ext2",
81	"ext3",
82	"jfs",
83	"reiserfs",
84	"xiafs",
85	"xfs",
86	NULL
87};
88
89#define BASE_MD "/dev/md"
90
91/*
92 * Global variables for options
93 */
94char *devices[MAX_DEVICES];
95char *args[MAX_ARGS];
96int num_devices, num_args;
97
98int verbose = 0;
99int doall = 0;
100int noexecute = 0;
101int serialize = 0;
102int skip_root = 0;
103int like_mount = 0;
104int notitle = 0;
105int parallel_root = 0;
106int progress = 0;
107int force_all_parallel = 0;
108int num_running = 0;
109int max_running = 0;
110volatile int cancel_requested = 0;
111int kill_sent = 0;
112char *progname;
113char *fstype = NULL;
114struct fs_info *filesys_info = NULL, *filesys_last = NULL;
115struct fsck_instance *instance_list;
116const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
117char *fsck_path = 0;
118blkid_cache cache = NULL;
119
120static char *string_copy(const char *s)
121{
122	char	*ret;
123
124	if (!s)
125		return 0;
126	ret = malloc(strlen(s)+1);
127	if (ret)
128		strcpy(ret, s);
129	return ret;
130}
131
132static int ignore(struct fs_info *);
133
134static char *skip_over_blank(char *cp)
135{
136	while (*cp && isspace(*cp))
137		cp++;
138	return cp;
139}
140
141static char *skip_over_word(char *cp)
142{
143	while (*cp && !isspace(*cp))
144		cp++;
145	return cp;
146}
147
148static void strip_line(char *line)
149{
150	char	*p;
151
152	while (*line) {
153		p = line + strlen(line) - 1;
154		if ((*p == '\n') || (*p == '\r'))
155			*p = 0;
156		else
157			break;
158	}
159}
160
161static char *parse_word(char **buf)
162{
163	char *word, *next;
164
165	word = *buf;
166	if (*word == 0)
167		return 0;
168
169	word = skip_over_blank(word);
170	next = skip_over_word(word);
171	if (*next)
172		*next++ = 0;
173	*buf = next;
174	return word;
175}
176
177static void parse_escape(char *word)
178{
179	char	*p, *q;
180	int	ac, i;
181
182	if (!word)
183		return;
184
185	for (p = word, q = word; *p; p++, q++) {
186		*q = *p;
187		if (*p != '\\')
188			continue;
189		if (*++p == 0)
190			break;
191		if (*p == 't') {
192			*q = '\t';
193			continue;
194		}
195		if (*p == 'n') {
196			*q = '\n';
197			continue;
198		}
199		if (!isdigit(*p)) {
200			*q = *p;
201			continue;
202		}
203		ac = 0;
204		for (i = 0; i < 3; i++, p++) {
205			if (!isdigit(*p))
206				break;
207			ac = (ac * 8) + (*p - '0');
208		}
209		*q = ac;
210		p--;
211	}
212	*q = 0;
213}
214
215static void free_instance(struct fsck_instance *i)
216{
217	if (i->prog)
218		free(i->prog);
219	if (i->device)
220		free(i->device);
221	if (i->base_device)
222		free(i->base_device);
223	free(i);
224	return;
225}
226
227static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
228					const char *type, const char *opts,
229					int freq, int passno)
230{
231	struct fs_info *fs;
232
233	if (!(fs = malloc(sizeof(struct fs_info))))
234		return NULL;
235
236	fs->device = string_copy(device);
237	fs->mountpt = string_copy(mntpnt);
238	fs->type = string_copy(type);
239	fs->opts = string_copy(opts ? opts : "");
240	fs->freq = freq;
241	fs->passno = passno;
242	fs->flags = 0;
243	fs->next = NULL;
244
245	if (!filesys_info)
246		filesys_info = fs;
247	else
248		filesys_last->next = fs;
249	filesys_last = fs;
250
251	return fs;
252}
253
254
255
256static int parse_fstab_line(char *line, struct fs_info **ret_fs)
257{
258	char	*dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
259	struct fs_info *fs;
260
261	*ret_fs = 0;
262	strip_line(line);
263	if ((cp = strchr(line, '#')))
264		*cp = 0;	/* Ignore everything after the comment char */
265	cp = line;
266
267	device = parse_word(&cp);
268	mntpnt = parse_word(&cp);
269	type = parse_word(&cp);
270	opts = parse_word(&cp);
271	freq = parse_word(&cp);
272	passno = parse_word(&cp);
273
274	if (!device)
275		return 0;	/* Allow blank lines */
276
277	if (!mntpnt || !type)
278		return -1;
279
280	parse_escape(device);
281	parse_escape(mntpnt);
282	parse_escape(type);
283	parse_escape(opts);
284	parse_escape(freq);
285	parse_escape(passno);
286
287	dev = blkid_get_devname(cache, device, NULL);
288	if (dev)
289		device = dev;
290
291	if (strchr(type, ','))
292		type = 0;
293
294	fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
295			      freq ? atoi(freq) : -1,
296			      passno ? atoi(passno) : -1);
297	if (dev)
298		free(dev);
299
300	if (!fs)
301		return -1;
302	*ret_fs = fs;
303	return 0;
304}
305
306static void interpret_type(struct fs_info *fs)
307{
308	char	*t;
309
310	if (strcmp(fs->type, "auto") != 0)
311		return;
312	t = blkid_get_tag_value(cache, "TYPE", fs->device);
313	if (t) {
314		free(fs->type);
315		fs->type = t;
316	}
317}
318
319/*
320 * Load the filesystem database from /etc/fstab
321 */
322static void load_fs_info(const char *filename)
323{
324	FILE	*f;
325	char	buf[1024];
326	int	lineno = 0;
327	int	old_fstab = 1;
328	struct fs_info *fs;
329
330	if ((f = fopen(filename, "r")) == NULL) {
331		fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
332			filename, strerror(errno));
333		return;
334	}
335	while (!feof(f)) {
336		lineno++;
337		if (!fgets(buf, sizeof(buf), f))
338			break;
339		buf[sizeof(buf)-1] = 0;
340		if (parse_fstab_line(buf, &fs) < 0) {
341			fprintf(stderr, _("WARNING: bad format "
342				"on line %d of %s\n"), lineno, filename);
343			continue;
344		}
345		if (!fs)
346			continue;
347		if (fs->passno < 0)
348			fs->passno = 0;
349		else
350			old_fstab = 0;
351	}
352
353	fclose(f);
354
355	if (old_fstab) {
356		fprintf(stderr, _("\007\007\007"
357		"WARNING: Your /etc/fstab does not contain the fsck passno\n"
358		"	field.  I will kludge around things for you, but you\n"
359		"	should fix your /etc/fstab file as soon as you can.\n\n"));
360
361		for (fs = filesys_info; fs; fs = fs->next) {
362			fs->passno = 1;
363		}
364	}
365}
366
367/* Lookup filesys in /etc/fstab and return the corresponding entry. */
368static struct fs_info *lookup(char *filesys)
369{
370	struct fs_info *fs;
371
372	/* No filesys name given. */
373	if (filesys == NULL)
374		return NULL;
375
376	for (fs = filesys_info; fs; fs = fs->next) {
377		if (!strcmp(filesys, fs->device) ||
378		    (fs->mountpt && !strcmp(filesys, fs->mountpt)))
379			break;
380	}
381
382	return fs;
383}
384
385/* Find fsck program for a given fs type. */
386static char *find_fsck(char *type)
387{
388  char *s;
389  const char *tpl;
390  static char prog[256];
391  char *p = string_copy(fsck_path);
392  struct stat st;
393
394  /* Are we looking for a program or just a type? */
395  tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
396
397  for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
398	sprintf(prog, tpl, s, type);
399	if (stat(prog, &st) == 0) break;
400  }
401  free(p);
402  return(s ? prog : NULL);
403}
404
405static int progress_active(NOARGS)
406{
407	struct fsck_instance *inst;
408
409	for (inst = instance_list; inst; inst = inst->next) {
410		if (inst->flags & FLAG_DONE)
411			continue;
412		if (inst->flags & FLAG_PROGRESS)
413			return 1;
414	}
415	return 0;
416}
417
418/*
419 * Execute a particular fsck program, and link it into the list of
420 * child processes we are waiting for.
421 */
422static int execute(const char *type, const char *device, const char *mntpt,
423		   int interactive)
424{
425	char *s, *argv[80], prog[80];
426	int  argc, i;
427	struct fsck_instance *inst, *p;
428	pid_t	pid;
429
430	inst = malloc(sizeof(struct fsck_instance));
431	if (!inst)
432		return ENOMEM;
433	memset(inst, 0, sizeof(struct fsck_instance));
434
435	sprintf(prog, "fsck.%s", type);
436	argv[0] = string_copy(prog);
437	argc = 1;
438
439	for (i=0; i <num_args; i++)
440		argv[argc++] = string_copy(args[i]);
441
442	if (progress & !progress_active()) {
443		if ((strcmp(type, "ext2") == 0) ||
444		    (strcmp(type, "ext3") == 0)) {
445			argv[argc++] = string_copy("-C0");
446			inst->flags |= FLAG_PROGRESS;
447		}
448	}
449
450	argv[argc++] = string_copy(device);
451	argv[argc] = 0;
452
453	s = find_fsck(prog);
454	if (s == NULL) {
455		fprintf(stderr, _("fsck: %s: not found\n"), prog);
456		return ENOENT;
457	}
458
459	if (verbose || noexecute) {
460		printf("[%s (%d) -- %s] ", s, num_running,
461		       mntpt ? mntpt : device);
462		for (i=0; i < argc; i++)
463			printf("%s ", argv[i]);
464		printf("\n");
465	}
466
467	/* Fork and execute the correct program. */
468	if (noexecute)
469		pid = -1;
470	else if ((pid = fork()) < 0) {
471		perror("fork");
472		return errno;
473	} else if (pid == 0) {
474		if (!interactive)
475			close(0);
476		(void) execv(s, argv);
477		perror(argv[0]);
478		exit(EXIT_ERROR);
479	}
480
481	for (i=0; i < argc; i++)
482		free(argv[i]);
483
484	inst->pid = pid;
485	inst->prog = string_copy(prog);
486	inst->type = string_copy(type);
487	inst->device = string_copy(device);
488	inst->base_device = base_device(device);
489	inst->start_time = time(0);
490	inst->next = NULL;
491
492	/*
493	 * Find the end of the list, so we add the instance on at the end.
494	 */
495	for (p = instance_list; p && p->next; p = p->next);
496
497	if (p)
498		p->next = inst;
499	else
500		instance_list = inst;
501
502	return 0;
503}
504
505/*
506 * Send a signal to all outstanding fsck child processes
507 */
508static int kill_all(int signum)
509{
510	struct fsck_instance *inst;
511	int	n = 0;
512
513	for (inst = instance_list; inst; inst = inst->next) {
514		if (inst->flags & FLAG_DONE)
515			continue;
516		kill(inst->pid, signum);
517		n++;
518	}
519	return n;
520}
521
522/*
523 * Wait for one child process to exit; when it does, unlink it from
524 * the list of executing child processes, and return it.
525 */
526static struct fsck_instance *wait_one(int flags)
527{
528	int	status;
529	int	sig;
530	struct fsck_instance *inst, *inst2, *prev;
531	pid_t	pid;
532
533	if (!instance_list)
534		return NULL;
535
536	if (noexecute) {
537		inst = instance_list;
538		prev = 0;
539#ifdef RANDOM_DEBUG
540		while (inst->next && (random() & 1)) {
541			prev = inst;
542			inst = inst->next;
543		}
544#endif
545		inst->exit_status = 0;
546		goto ret_inst;
547	}
548
549	/*
550	 * gcc -Wall fails saving throw against stupidity
551	 * (inst and prev are thought to be uninitialized variables)
552	 */
553	inst = prev = NULL;
554
555	do {
556		pid = waitpid(-1, &status, flags);
557		if (cancel_requested && !kill_sent) {
558			kill_all(SIGTERM);
559			kill_sent++;
560		}
561		if ((pid == 0) && (flags & WNOHANG))
562			return NULL;
563		if (pid < 0) {
564			if ((errno == EINTR) || (errno == EAGAIN))
565				continue;
566			if (errno == ECHILD) {
567				fprintf(stderr,
568					_("%s: wait: No more child process?!?\n"),
569					progname);
570				return NULL;
571			}
572			perror("wait");
573			continue;
574		}
575		for (prev = 0, inst = instance_list;
576		     inst;
577		     prev = inst, inst = inst->next) {
578			if (inst->pid == pid)
579				break;
580		}
581	} while (!inst);
582
583	if (WIFEXITED(status))
584		status = WEXITSTATUS(status);
585	else if (WIFSIGNALED(status)) {
586		sig = WTERMSIG(status);
587		if (sig == SIGINT) {
588			status = EXIT_UNCORRECTED;
589		} else {
590			printf(_("Warning... %s for device %s exited "
591			       "with signal %d.\n"),
592			       inst->prog, inst->device, sig);
593			status = EXIT_ERROR;
594		}
595	} else {
596		printf(_("%s %s: status is %x, should never happen.\n"),
597		       inst->prog, inst->device, status);
598		status = EXIT_ERROR;
599	}
600	inst->exit_status = status;
601	if (progress && (inst->flags & FLAG_PROGRESS) &&
602	    !progress_active()) {
603		for (inst2 = instance_list; inst2; inst2 = inst2->next) {
604			if (inst2->flags & FLAG_DONE)
605				continue;
606			if (strcmp(inst2->type, "ext2") &&
607			    strcmp(inst2->type, "ext3"))
608				continue;
609			/*
610			 * If we've just started the fsck, wait a tiny
611			 * bit before sending the kill, to give it
612			 * time to set up the signal handler
613			 */
614			if (inst2->start_time < time(0)+2) {
615				if (fork() == 0) {
616					sleep(1);
617					kill(inst2->pid, SIGUSR1);
618					exit(0);
619				}
620			} else
621				kill(inst2->pid, SIGUSR1);
622			inst2->flags |= FLAG_PROGRESS;
623			break;
624		}
625	}
626ret_inst:
627	if (prev)
628		prev->next = inst->next;
629	else
630		instance_list = inst->next;
631	if (verbose > 1)
632		printf(_("Finished with %s (exit status %d)\n"),
633		       inst->device, inst->exit_status);
634	num_running--;
635	return inst;
636}
637
638#define FLAG_WAIT_ALL		0
639#define FLAG_WAIT_ATLEAST_ONE	1
640/*
641 * Wait until all executing child processes have exited; return the
642 * logical OR of all of their exit code values.
643 */
644static int wait_many(int flags)
645{
646	struct fsck_instance *inst;
647	int	global_status = 0;
648	int	wait_flags = 0;
649
650	while ((inst = wait_one(wait_flags))) {
651		global_status |= inst->exit_status;
652		free_instance(inst);
653#ifdef RANDOM_DEBUG
654		if (noexecute && (flags & WNOHANG) && !(random() % 3))
655			break;
656#endif
657		if (flags & FLAG_WAIT_ATLEAST_ONE)
658			wait_flags = WNOHANG;
659	}
660	return global_status;
661}
662
663/*
664 * Run the fsck program on a particular device
665 *
666 * If the type is specified using -t, and it isn't prefixed with "no"
667 * (as in "noext2") and only one filesystem type is specified, then
668 * use that type regardless of what is specified in /etc/fstab.
669 *
670 * If the type isn't specified by the user, then use either the type
671 * specified in /etc/fstab, or DEFAULT_FSTYPE.
672 */
673static void fsck_device(struct fs_info *fs, int interactive)
674{
675	const char *type;
676	int retval;
677
678	interpret_type(fs);
679
680	if (strcmp(fs->type, "auto") != 0)
681		type = fs->type;
682	else if (fstype && strncmp(fstype, "no", 2) &&
683	    strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
684	    !strchr(fstype, ','))
685		type = fstype;
686	else
687		type = DEFAULT_FSTYPE;
688
689	num_running++;
690	retval = execute(type, fs->device, fs->mountpt, interactive);
691	if (retval) {
692		fprintf(stderr, _("%s: Error %d while executing fsck.%s "
693			"for %s\n"), progname, retval, type, fs->device);
694		num_running--;
695	}
696}
697
698
699/*
700 * Deal with the fsck -t argument.
701 */
702struct fs_type_compile {
703	char **list;
704	int *type;
705	int  negate;
706} fs_type_compiled;
707
708#define FS_TYPE_NORMAL	0
709#define FS_TYPE_OPT	1
710#define FS_TYPE_NEGOPT	2
711
712static const char *fs_type_syntax_error =
713N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
714   "with 'no' or '!'.\n");
715
716static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
717{
718	char 	*cp, *list, *s;
719	int	num = 2;
720	int	negate, first_negate = 1;
721
722	if (fs_type) {
723		for (cp=fs_type; *cp; cp++) {
724			if (*cp == ',')
725				num++;
726		}
727	}
728
729	cmp->list = malloc(num * sizeof(char *));
730	cmp->type = malloc(num * sizeof(int));
731	if (!cmp->list || !cmp->type) {
732		fprintf(stderr, _("Couldn't allocate memory for "
733				  "filesystem types\n"));
734		exit(EXIT_ERROR);
735	}
736	memset(cmp->list, 0, num * sizeof(char *));
737	memset(cmp->type, 0, num * sizeof(int));
738	cmp->negate = 0;
739
740	if (!fs_type)
741		return;
742
743	list = string_copy(fs_type);
744	num = 0;
745	s = strtok(list, ",");
746	while(s) {
747		negate = 0;
748		if (strncmp(s, "no", 2) == 0) {
749			s += 2;
750			negate = 1;
751		} else if (*s == '!') {
752			s++;
753			negate = 1;
754		}
755		if (strcmp(s, "loop") == 0)
756			/* loop is really short-hand for opts=loop */
757			goto loop_special_case;
758		else if (strncmp(s, "opts=", 5) == 0) {
759			s += 5;
760		loop_special_case:
761			cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
762		} else {
763			if (first_negate) {
764				cmp->negate = negate;
765				first_negate = 0;
766			}
767			if ((negate && !cmp->negate) ||
768			    (!negate && cmp->negate)) {
769				fprintf(stderr, _(fs_type_syntax_error));
770				exit(EXIT_USAGE);
771			}
772		}
773#if 0
774		printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
775#endif
776	        cmp->list[num++] = string_copy(s);
777		s = strtok(NULL, ",");
778	}
779	free(list);
780}
781
782/*
783 * This function returns true if a particular option appears in a
784 * comma-delimited options list
785 */
786static int opt_in_list(char *opt, char *optlist)
787{
788	char	*list, *s;
789
790	if (!optlist)
791		return 0;
792	list = string_copy(optlist);
793
794	s = strtok(list, ",");
795	while(s) {
796		if (strcmp(s, opt) == 0) {
797			free(list);
798			return 1;
799		}
800		s = strtok(NULL, ",");
801	}
802        free(list);
803	return 0;
804}
805
806/* See if the filesystem matches the criteria given by the -t option */
807static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
808{
809	int n, ret = 0, checked_type = 0;
810	char *cp;
811
812	if (cmp->list == 0 || cmp->list[0] == 0)
813		return 1;
814
815	for (n=0; (cp = cmp->list[n]); n++) {
816		switch (cmp->type[n]) {
817		case FS_TYPE_NORMAL:
818			checked_type++;
819			if (strcmp(cp, fs->type) == 0) {
820				ret = 1;
821			}
822			break;
823		case FS_TYPE_NEGOPT:
824			if (opt_in_list(cp, fs->opts))
825				return 0;
826			break;
827		case FS_TYPE_OPT:
828			if (!opt_in_list(cp, fs->opts))
829				return 0;
830			break;
831		}
832	}
833	if (checked_type == 0)
834		return 1;
835	return (cmp->negate ? !ret : ret);
836}
837
838/* Check if we should ignore this filesystem. */
839static int ignore(struct fs_info *fs)
840{
841	const char **ip;
842	int wanted = 0;
843
844	/*
845	 * If the pass number is 0, ignore it.
846	 */
847	if (fs->passno == 0)
848		return 1;
849
850	interpret_type(fs);
851
852	/*
853	 * If a specific fstype is specified, and it doesn't match,
854	 * ignore it.
855	 */
856	if (!fs_match(fs, &fs_type_compiled)) return 1;
857
858	/* Are we ignoring this type? */
859	for(ip = ignored_types; *ip; ip++)
860		if (strcmp(fs->type, *ip) == 0) return 1;
861
862	/* Do we really really want to check this fs? */
863	for(ip = really_wanted; *ip; ip++)
864		if (strcmp(fs->type, *ip) == 0) {
865			wanted = 1;
866			break;
867		}
868
869	/* See if the <fsck.fs> program is available. */
870	if (find_fsck(fs->type) == NULL) {
871		if (wanted)
872			fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
873				fs->device, fs->type);
874		return 1;
875	}
876
877	/* We can and want to check this file system type. */
878	return 0;
879}
880
881/*
882 * Returns TRUE if a partition on the same disk is already being
883 * checked.
884 */
885static int device_already_active(char *device)
886{
887	struct fsck_instance *inst;
888	char *base;
889
890	if (force_all_parallel)
891		return 0;
892
893#ifdef BASE_MD
894	/* Don't check a soft raid disk with any other disk */
895	if (instance_list &&
896	    (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
897	     !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
898		return 1;
899#endif
900
901	base = base_device(device);
902	/*
903	 * If we don't know the base device, assume that the device is
904	 * already active if there are any fsck instances running.
905	 */
906	if (!base)
907		return (instance_list != 0);
908	for (inst = instance_list; inst; inst = inst->next) {
909		if (!inst->base_device || !strcmp(base, inst->base_device)) {
910			free(base);
911			return 1;
912		}
913	}
914	free(base);
915	return 0;
916}
917
918/* Check all file systems, using the /etc/fstab table. */
919static int check_all(NOARGS)
920{
921	struct fs_info *fs = NULL;
922	int status = EXIT_OK;
923	int not_done_yet = 1;
924	int passno = 1;
925	int pass_done;
926
927	if (verbose)
928		printf(_("Checking all file systems.\n"));
929
930	/*
931	 * Do an initial scan over the filesystem; mark filesystems
932	 * which should be ignored as done, and resolve any "auto"
933	 * filesystem types (done as a side-effect of calling ignore()).
934	 */
935	for (fs = filesys_info; fs; fs = fs->next) {
936		if (ignore(fs))
937			fs->flags |= FLAG_DONE;
938	}
939
940	/*
941	 * Find and check the root filesystem.
942	 */
943	if (!parallel_root) {
944		for (fs = filesys_info; fs; fs = fs->next) {
945			if (!strcmp(fs->mountpt, "/"))
946				break;
947		}
948		if (fs) {
949			if (!skip_root && !ignore(fs)) {
950				fsck_device(fs, 1);
951				status |= wait_many(FLAG_WAIT_ALL);
952				if (status > EXIT_NONDESTRUCT)
953					return status;
954			}
955			fs->flags |= FLAG_DONE;
956		}
957	}
958	/*
959	 * This is for the bone-headed user who enters the root
960	 * filesystem twice.  Skip root will skep all root entries.
961	 */
962	if (skip_root)
963		for (fs = filesys_info; fs; fs = fs->next)
964			if (!strcmp(fs->mountpt, "/"))
965				fs->flags |= FLAG_DONE;
966
967	while (not_done_yet) {
968		not_done_yet = 0;
969		pass_done = 1;
970
971		for (fs = filesys_info; fs; fs = fs->next) {
972			if (cancel_requested)
973				break;
974			if (fs->flags & FLAG_DONE)
975				continue;
976			/*
977			 * If the filesystem's pass number is higher
978			 * than the current pass number, then we don't
979			 * do it yet.
980			 */
981			if (fs->passno > passno) {
982				not_done_yet++;
983				continue;
984			}
985			/*
986			 * If a filesystem on a particular device has
987			 * already been spawned, then we need to defer
988			 * this to another pass.
989			 */
990			if (device_already_active(fs->device)) {
991				pass_done = 0;
992				continue;
993			}
994			/*
995			 * Spawn off the fsck process
996			 */
997			fsck_device(fs, serialize);
998			fs->flags |= FLAG_DONE;
999
1000			/*
1001			 * Only do one filesystem at a time, or if we
1002			 * have a limit on the number of fsck's extant
1003			 * at one time, apply that limit.
1004			 */
1005			if (serialize ||
1006			    (max_running && (num_running >= max_running))) {
1007				pass_done = 0;
1008				break;
1009			}
1010		}
1011		if (cancel_requested)
1012			break;
1013		if (verbose > 1)
1014			printf(_("--waiting-- (pass %d)\n"), passno);
1015		status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1016				    FLAG_WAIT_ATLEAST_ONE);
1017		if (pass_done) {
1018			if (verbose > 1)
1019				printf("----------------------------------\n");
1020			passno++;
1021		} else
1022			not_done_yet++;
1023	}
1024	if (cancel_requested && !kill_sent) {
1025		kill_all(SIGTERM);
1026		kill_sent++;
1027	}
1028	status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1029	return status;
1030}
1031
1032static void usage(NOARGS)
1033{
1034	fprintf(stderr,
1035		_("Usage: fsck [-ACNPRTV] [-t fstype] [fs-options] [filesys ...]\n"));
1036	exit(EXIT_USAGE);
1037}
1038
1039#ifdef HAVE_SIGNAL_H
1040static void signal_cancel(int sig)
1041{
1042	cancel_requested++;
1043}
1044#endif
1045
1046static void PRS(int argc, char *argv[])
1047{
1048	int	i, j;
1049	char	*arg, *dev, *tmp = 0;
1050	char	options[128];
1051	int	opt = 0;
1052	int     opts_for_fsck = 0;
1053#ifdef HAVE_SIGNAL_H
1054	struct sigaction	sa;
1055
1056	/*
1057	 * Set up signal action
1058	 */
1059	memset(&sa, 0, sizeof(struct sigaction));
1060	sa.sa_handler = signal_cancel;
1061	sigaction(SIGINT, &sa, 0);
1062	sigaction(SIGTERM, &sa, 0);
1063#endif
1064
1065	num_devices = 0;
1066	num_args = 0;
1067	instance_list = 0;
1068
1069	progname = argv[0];
1070
1071	for (i=1; i < argc; i++) {
1072		arg = argv[i];
1073		if (!arg)
1074			continue;
1075		if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1076			if (num_devices >= MAX_DEVICES) {
1077				fprintf(stderr, _("%s: too many devices\n"),
1078					progname);
1079				exit(EXIT_ERROR);
1080			}
1081			dev = blkid_get_devname(cache, arg, NULL);
1082			if (!dev && strchr(arg, '=')) {
1083				/*
1084				 * Check to see if we failed because
1085				 * /proc/partitions isn't found.
1086				 */
1087				if (access("/proc/partitions", R_OK) < 0) {
1088					fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1089						strerror(errno));
1090					fprintf(stderr, "Is /proc mounted?\n");
1091					exit(EXIT_ERROR);
1092				}
1093				/*
1094				 * Check to see if this is because
1095				 * we're not running as root
1096				 */
1097				if (geteuid())
1098					fprintf(stderr,
1099		"Must be root to scan for matching filesystems: %s\n", arg);
1100				else
1101					fprintf(stderr,
1102		"Couldn't find matching filesystem: %s\n", arg);
1103				exit(EXIT_ERROR);
1104			}
1105			devices[num_devices++] = dev ? dev : string_copy(arg);
1106			continue;
1107		}
1108		if (arg[0] != '-' || opts_for_fsck) {
1109			if (num_args >= MAX_ARGS) {
1110				fprintf(stderr, _("%s: too many arguments\n"),
1111					progname);
1112				exit(EXIT_ERROR);
1113			}
1114			args[num_args++] = string_copy(arg);
1115			continue;
1116		}
1117		for (j=1; arg[j]; j++) {
1118			if (opts_for_fsck) {
1119				options[++opt] = arg[j];
1120				continue;
1121			}
1122			switch (arg[j]) {
1123			case 'A':
1124				doall++;
1125				break;
1126			case 'C':
1127				progress++;
1128				break;
1129			case 'V':
1130				verbose++;
1131				break;
1132			case 'N':
1133				noexecute++;
1134				break;
1135			case 'R':
1136				skip_root++;
1137				break;
1138			case 'T':
1139				notitle++;
1140				break;
1141			case 'M':
1142				like_mount++;
1143				break;
1144			case 'P':
1145				parallel_root++;
1146				break;
1147			case 's':
1148				serialize++;
1149				break;
1150			case 't':
1151				if (fstype)
1152					usage();
1153				if (arg[j+1])
1154					tmp = arg+j+1;
1155				else if ((i+1) < argc)
1156					tmp = argv[++i];
1157				else
1158					usage();
1159				fstype = string_copy(tmp);
1160				compile_fs_type(fstype, &fs_type_compiled);
1161				goto next_arg;
1162			case '-':
1163				opts_for_fsck++;
1164				break;
1165			case '?':
1166				usage();
1167				break;
1168			default:
1169				options[++opt] = arg[j];
1170				break;
1171			}
1172		}
1173	next_arg:
1174		if (opt) {
1175			options[0] = '-';
1176			options[++opt] = '\0';
1177			if (num_args >= MAX_ARGS) {
1178				fprintf(stderr,
1179					_("%s: too many arguments\n"),
1180					progname);
1181				exit(EXIT_ERROR);
1182			}
1183			args[num_args++] = string_copy(options);
1184			opt = 0;
1185		}
1186	}
1187	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1188		force_all_parallel++;
1189	if ((tmp = getenv("FSCK_MAX_INST")))
1190	    max_running = atoi(tmp);
1191}
1192
1193int main(int argc, char *argv[])
1194{
1195	int i, status = 0;
1196	int interactive = 0;
1197	char *oldpath = getenv("PATH");
1198	const char *fstab;
1199	struct fs_info *fs;
1200
1201	setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1202	setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1203
1204#ifdef ENABLE_NLS
1205	setlocale(LC_MESSAGES, "");
1206	setlocale(LC_CTYPE, "");
1207	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1208	textdomain(NLS_CAT_NAME);
1209#endif
1210	blkid_get_cache(&cache, NULL);
1211	PRS(argc, argv);
1212
1213	if (!notitle)
1214		printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1215
1216	fstab = getenv("FSTAB_FILE");
1217	if (!fstab)
1218		fstab = _PATH_MNTTAB;
1219	load_fs_info(fstab);
1220
1221	/* Update our search path to include uncommon directories. */
1222	if (oldpath) {
1223		fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1224				    strlen (oldpath) + 1);
1225		strcpy (fsck_path, fsck_prefix_path);
1226		strcat (fsck_path, ":");
1227		strcat (fsck_path, oldpath);
1228	} else {
1229		fsck_path = string_copy(fsck_prefix_path);
1230	}
1231
1232	if ((num_devices == 1) || (serialize))
1233		interactive = 1;
1234
1235	/* If -A was specified ("check all"), do that! */
1236	if (doall)
1237		return check_all();
1238
1239	if (num_devices == 0) {
1240		serialize++;
1241		interactive++;
1242		return check_all();
1243	}
1244	for (i = 0 ; i < num_devices; i++) {
1245		if (cancel_requested) {
1246			if (!kill_sent) {
1247				kill_all(SIGTERM);
1248				kill_sent++;
1249			}
1250			break;
1251		}
1252		fs = lookup(devices[i]);
1253		if (!fs) {
1254			fs = create_fs_device(devices[i], 0, "auto",
1255					      0, -1, -1);
1256			if (!fs)
1257				continue;
1258		}
1259		fsck_device(fs, interactive);
1260		if (serialize ||
1261		    (max_running && (num_running >= max_running))) {
1262			struct fsck_instance *inst;
1263
1264			inst = wait_one(0);
1265			if (inst) {
1266				status |= inst->exit_status;
1267				free_instance(inst);
1268			}
1269			if (verbose > 1)
1270				printf("----------------------------------\n");
1271		}
1272	}
1273	status |= wait_many(FLAG_WAIT_ALL);
1274	free(fsck_path);
1275	blkid_put_cache(cache);
1276	return status;
1277}
1278