fsck.c revision 75936 
1/*	$NetBSD: fsck.c,v 1.21 1999/04/22 04:20:53 abs Exp $	*/
2
3/*
4 * Copyright (c) 1996 Christos Zoulas. All rights reserved.
5 * Copyright (c) 1980, 1989, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * From: @(#)mount.c	8.19 (Berkeley) 4/19/94
37 * From: $NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
38 * $NetBSD: fsck.c,v 1.21 1999/04/22 04:20:53 abs Exp $
39 */
40
41#include <sys/cdefs.h>
42#ifndef lint
43__RCSID("$FreeBSD: head/sbin/fsck/fsck.c 75936 2001-04-25 07:18:22Z mckusick $");
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/mount.h>
48#include <sys/queue.h>
49#include <sys/wait.h>
50#define FSTYPENAMES
51#define DKTYPENAMES
52#include <sys/disklabel.h>
53#include <sys/ioctl.h>
54
55#include <err.h>
56#include <errno.h>
57#include <fstab.h>
58#include <fcntl.h>
59#include <paths.h>
60#include <signal.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <unistd.h>
65
66#include "pathnames.h"
67#include "fsutil.h"
68
69static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
70
71TAILQ_HEAD(fstypelist, entry) opthead, selhead;
72
73struct entry {
74	char *type;
75	char *options;
76	TAILQ_ENTRY(entry) entries;
77};
78
79static char *options = NULL;
80static int flags = 0;
81static int forceflag = 0;
82
83int main __P((int, char *[]));
84
85static int checkfs __P((const char *, const char *, const char *, char *,
86    pid_t *));
87static int selected __P((const char *));
88static void addoption __P((char *));
89static const char *getoptions __P((const char *));
90static void addentry __P((struct fstypelist *, const char *, const char *));
91static void maketypelist __P((char *));
92static void catopt __P((char **, const char *));
93static void mangle __P((char *, int *, const char ***, int *));
94static const char *getfslab __P((const char *));
95static void usage __P((void));
96static int isok __P((struct fstab *));
97
98int
99main(argc, argv)
100	int argc;
101	char *argv[];
102{
103	struct fstab *fs;
104	int i, rval = 0;
105	const char *vfstype = NULL;
106	char globopt[3];
107
108	globopt[0] = '-';
109	globopt[2] = '\0';
110
111	TAILQ_INIT(&selhead);
112	TAILQ_INIT(&opthead);
113
114	while ((i = getopt(argc, argv, "BdvpfFnyl:t:T:")) != -1)
115		switch (i) {
116		case 'B':
117			if (flags & CHECK_BACKGRD)
118				errx(1, "Cannot specify -B and -F.");
119			flags |= DO_BACKGRD;
120			break;
121
122		case 'd':
123			flags |= CHECK_DEBUG;
124			break;
125
126		case 'v':
127			flags |= CHECK_VERBOSE;
128			break;
129
130		case 'F':
131			if (flags & DO_BACKGRD)
132				errx(1, "Cannot specify -B and -F.");
133			flags |= CHECK_BACKGRD;
134			break;
135
136		case 'p':
137			flags |= CHECK_PREEN;
138			/*FALLTHROUGH*/
139		case 'n':
140		case 'y':
141			globopt[1] = i;
142			catopt(&options, globopt);
143			break;
144
145		case 'f':
146			forceflag = 1;
147			globopt[1] = i;
148			catopt(&options, globopt);
149			break;
150
151		case 'l':
152			warnx("Ignoring obsolete -l option\n");
153			break;
154
155		case 'T':
156			if (*optarg)
157				addoption(optarg);
158			break;
159
160		case 't':
161			if (!TAILQ_EMPTY(&selhead))
162				errx(1, "only one -t option may be specified.");
163
164			maketypelist(optarg);
165			vfstype = optarg;
166			break;
167
168		case '?':
169		default:
170			usage();
171			/* NOTREACHED */
172		}
173
174	argc -= optind;
175	argv += optind;
176
177	if (argc == 0)
178		return checkfstab(flags, isok, checkfs);
179
180#define	BADTYPE(type)							\
181	(strcmp(type, FSTAB_RO) &&					\
182	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
183
184
185	for (; argc--; argv++) {
186		const char *spec, *mntpt, *type, *cp;
187		char device[MAXPATHLEN];
188		struct statfs *mntp;
189
190		spec = *argv;
191		cp = strrchr(spec, '/');
192		if (cp == 0) {
193			(void)snprintf(device, sizeof(device), "%s%s",
194				_PATH_DEV, spec);
195			spec = device;
196		}
197		mntp = getmntpt(spec);
198		if (mntp != NULL) {
199			spec = mntp->f_mntfromname;
200			mntpt = mntp->f_mntonname;
201		}
202		if ((fs = getfsfile(spec)) == NULL &&
203		    (fs = getfsspec(spec)) == NULL) {
204			if (vfstype == NULL)
205				vfstype = getfslab(spec);
206			type = vfstype;
207			devcheck(spec);
208		} else {
209			spec = fs->fs_spec;
210			type = fs->fs_vfstype;
211			mntpt = fs->fs_file;
212			if (BADTYPE(fs->fs_type))
213				errx(1, "%s has unknown file system type.",
214				    spec);
215		}
216		if ((flags & CHECK_BACKGRD) &&
217		    checkfs(type, spec, mntpt, "-F", NULL) == 0) {
218			printf("%s: DEFER FOR BACKGROUND CHECKING\n", *argv);
219			continue;
220		}
221		if ((flags & DO_BACKGRD) && forceflag == 0 &&
222		    checkfs(type, spec, mntpt, "-F", NULL) != 0)
223			continue;
224
225		rval |= checkfs(type, spec, mntpt, NULL, NULL);
226	}
227
228	return rval;
229}
230
231
232static int
233isok(fs)
234	struct fstab *fs;
235{
236	int i;
237
238	if (fs->fs_passno == 0)
239		return (0);
240	if (BADTYPE(fs->fs_type))
241		return (0);
242	if (!selected(fs->fs_vfstype))
243		return (0);
244	/*
245	 * If the -B flag has been given, then process the needed
246	 * background checks. Background checks cannot be run on
247	 * filesystems that will be mounted read-only or that were
248	 * not mounted at boot time (typically those marked `noauto').
249	 * If these basic tests are passed, check with the filesystem
250	 * itself to see if it is willing to do background checking
251	 * by invoking its check program with the -F flag.
252	 */
253	if (flags & DO_BACKGRD) {
254		if (!strcmp(fs->fs_type, FSTAB_RO))
255			return (0);
256		if (getmntpt(fs->fs_spec) == NULL)
257			return (0);
258		if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
259			return (0);
260		return (1);
261	}
262	/*
263	 * If the -F flag has been given, then consider deferring the
264	 * check to background. Background checks cannot be run on
265	 * filesystems that will be mounted read-only or that will
266	 * not be mounted at boot time (e.g., marked `noauto'). If
267	 * these basic tests are passed, check with the filesystem
268	 * itself to see if it is willing to defer to background
269	 * checking by invoking its check program with the -F flag.
270	 */
271	if ((flags & CHECK_BACKGRD) == 0 || !strcmp(fs->fs_type, FSTAB_RO))
272		return (1);
273	for (i = strlen(fs->fs_mntops) - 6; i >= 0; i--)
274		if (!strncmp(&fs->fs_mntops[i], "noauto", 6))
275			break;
276	if (i >= 0)
277		return (1);
278	if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", NULL) != 0)
279		return (1);
280	printf("%s: DEFER FOR BACKGROUND CHECKING\n", fs->fs_spec);
281	return (0);
282}
283
284
285static int
286checkfs(pvfstype, spec, mntpt, auxopt, pidp)
287	const char *pvfstype, *spec, *mntpt;
288	char *auxopt;
289	pid_t *pidp;
290{
291	/* List of directories containing fsck_xxx subcommands. */
292	static const char *edirs[] = {
293		_PATH_SBIN,
294		_PATH_USRSBIN,
295		NULL
296	};
297	const char **argv, **edir;
298	pid_t pid;
299	int argc, i, status, maxargc;
300	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
301	char *vfstype = NULL;
302	const char *extra = NULL;
303
304#ifdef __GNUC__
305	/* Avoid vfork clobbering */
306	(void) &optbuf;
307	(void) &vfstype;
308#endif
309	/*
310	 * We convert the vfstype to lowercase and any spaces to underscores
311	 * to not confuse the issue
312	 */
313	vfstype = strdup(pvfstype);
314	if (vfstype == NULL)
315		perror("strdup(pvfstype)");
316	for (i = 0; i < strlen(vfstype); i++) {
317		vfstype[i] = tolower(vfstype[i]);
318		if (vfstype[i] == ' ')
319			vfstype[i] = '_';
320	}
321
322	extra = getoptions(vfstype);
323	optbuf = NULL;
324	if (options)
325		catopt(&optbuf, options);
326	if (extra)
327		catopt(&optbuf, extra);
328	if (auxopt)
329		catopt(&optbuf, auxopt);
330	else if (flags & DO_BACKGRD)
331		catopt(&optbuf, "-B");
332
333	maxargc = 64;
334	argv = emalloc(sizeof(char *) * maxargc);
335
336	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
337	argc = 0;
338	argv[argc++] = execbase;
339	if (optbuf)
340		mangle(optbuf, &argc, &argv, &maxargc);
341	argv[argc++] = spec;
342	argv[argc] = NULL;
343
344	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
345		(void)printf("start %s %swait", mntpt,
346			pidp ? "no" : "");
347		for (i = 0; i < argc; i++)
348			(void)printf(" %s", argv[i]);
349		(void)printf("\n");
350	}
351
352	switch (pid = vfork()) {
353	case -1:				/* Error. */
354		warn("vfork");
355		if (optbuf)
356			free(optbuf);
357		free(vfstype);
358		return (1);
359
360	case 0:					/* Child. */
361		if ((flags & CHECK_DEBUG) && auxopt == NULL)
362			_exit(0);
363
364		/* Go find an executable. */
365		edir = edirs;
366		do {
367			(void)snprintf(execname,
368			    sizeof(execname), "%s/%s", *edir, execbase);
369			execv(execname, (char * const *)argv);
370			if (errno != ENOENT) {
371				if (spec)
372					warn("exec %s for %s", execname, spec);
373				else
374					warn("exec %s", execname);
375			}
376		} while (*++edir != NULL);
377
378		if (errno == ENOENT) {
379			if (spec)
380				warn("exec %s for %s", execname, spec);
381			else
382				warn("exec %s", execname);
383		}
384		_exit(1);
385		/* NOTREACHED */
386
387	default:				/* Parent. */
388		if (optbuf)
389			free(optbuf);
390
391		free(vfstype);
392
393		if (pidp) {
394			*pidp = pid;
395			return 0;
396		}
397
398		if (waitpid(pid, &status, 0) < 0) {
399			warn("waitpid");
400			return (1);
401		}
402
403		if (WIFEXITED(status)) {
404			if (WEXITSTATUS(status) != 0)
405				return (WEXITSTATUS(status));
406		}
407		else if (WIFSIGNALED(status)) {
408			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
409			return (1);
410		}
411		break;
412	}
413
414	return (0);
415}
416
417
418static int
419selected(type)
420	const char *type;
421{
422	struct entry *e;
423
424	/* If no type specified, it's always selected. */
425	TAILQ_FOREACH(e, &selhead, entries)
426		if (!strncmp(e->type, type, MFSNAMELEN))
427			return which == IN_LIST ? 1 : 0;
428
429	return which == IN_LIST ? 0 : 1;
430}
431
432
433static const char *
434getoptions(type)
435	const char *type;
436{
437	struct entry *e;
438
439	TAILQ_FOREACH(e, &opthead, entries)
440		if (!strncmp(e->type, type, MFSNAMELEN))
441			return e->options;
442	return "";
443}
444
445
446static void
447addoption(optstr)
448	char *optstr;
449{
450	char *newoptions;
451	struct entry *e;
452
453	if ((newoptions = strchr(optstr, ':')) == NULL)
454		errx(1, "Invalid option string");
455
456	*newoptions++ = '\0';
457
458	TAILQ_FOREACH(e, &opthead, entries)
459		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
460			catopt(&e->options, newoptions);
461			return;
462		}
463	addentry(&opthead, optstr, newoptions);
464}
465
466
467static void
468addentry(list, type, opts)
469	struct fstypelist *list;
470	const char *type;
471	const char *opts;
472{
473	struct entry *e;
474
475	e = emalloc(sizeof(struct entry));
476	e->type = estrdup(type);
477	e->options = estrdup(opts);
478	TAILQ_INSERT_TAIL(list, e, entries);
479}
480
481
482static void
483maketypelist(fslist)
484	char *fslist;
485{
486	char *ptr;
487
488	if ((fslist == NULL) || (fslist[0] == '\0'))
489		errx(1, "empty type list");
490
491	if (fslist[0] == 'n' && fslist[1] == 'o') {
492		fslist += 2;
493		which = NOT_IN_LIST;
494	}
495	else
496		which = IN_LIST;
497
498	while ((ptr = strsep(&fslist, ",")) != NULL)
499		addentry(&selhead, ptr, "");
500
501}
502
503
504static void
505catopt(sp, o)
506	char **sp;
507	const char *o;
508{
509	char *s;
510	size_t i, j;
511
512	s = *sp;
513	if (s) {
514		i = strlen(s);
515		j = i + 1 + strlen(o) + 1;
516		s = erealloc(s, j);
517		(void)snprintf(s + i, j, ",%s", o);
518	} else
519		s = estrdup(o);
520	*sp = s;
521}
522
523
524static void
525mangle(options, argcp, argvp, maxargcp)
526	char *options;
527	int *argcp, *maxargcp;
528	const char ***argvp;
529{
530	char *p, *s;
531	int argc, maxargc;
532	const char **argv;
533
534	argc = *argcp;
535	argv = *argvp;
536	maxargc = *maxargcp;
537
538	for (s = options; (p = strsep(&s, ",")) != NULL;) {
539		/* Always leave space for one more argument and the NULL. */
540		if (argc >= maxargc - 3) {
541			maxargc <<= 1;
542			argv = erealloc(argv, maxargc * sizeof(char *));
543		}
544		if (*p != '\0')  {
545			if (*p == '-') {
546				argv[argc++] = p;
547				p = strchr(p, '=');
548				if (p) {
549					*p = '\0';
550					argv[argc++] = p+1;
551				}
552			} else {
553				argv[argc++] = "-o";
554				argv[argc++] = p;
555			}
556		}
557	}
558
559	*argcp = argc;
560	*argvp = argv;
561	*maxargcp = maxargc;
562}
563
564
565const static char *
566getfslab(str)
567	const char *str;
568{
569	struct disklabel dl;
570	int fd;
571	char p;
572	const char *vfstype;
573	u_char t;
574
575	/* deduce the filesystem type from the disk label */
576	if ((fd = open(str, O_RDONLY)) == -1)
577		err(1, "cannot open `%s'", str);
578
579	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
580		err(1, "cannot get disklabel for `%s'", str);
581
582	(void) close(fd);
583
584	p = str[strlen(str) - 1];
585
586	if ((p - 'a') >= dl.d_npartitions)
587		errx(1, "partition `%s' is not defined on disk", str);
588
589	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
590		errx(1, "partition `%s' is not of a legal vfstype",
591		    str);
592
593	if ((vfstype = fstypenames[t]) == NULL)
594		errx(1, "vfstype `%s' on partition `%s' is not supported",
595		    fstypenames[t], str);
596
597	return vfstype;
598}
599
600
601static void
602usage()
603{
604	extern char *__progname;
605	static const char common[] =
606	    "[-dpvlyn] [-T fstype:fsoptions] [-t fstype]";
607
608	(void)fprintf(stderr, "Usage: %s %s [special|node]...\n",
609	    __progname, common);
610	exit(1);
611}
612