fsck.c revision 106254 
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__FBSDID("$FreeBSD: head/sbin/fsck/fsck.c 106254 2002-10-31 15:32:39Z phk $");
43
44#include <sys/param.h>
45#include <sys/mount.h>
46#include <sys/queue.h>
47#include <sys/wait.h>
48#define FSTYPENAMES
49#define DKTYPENAMES
50#include <sys/disklabel.h>
51#include <sys/ioctl.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <errno.h>
56#include <fstab.h>
57#include <fcntl.h>
58#include <paths.h>
59#include <signal.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65#include "pathnames.h"
66#include "fsutil.h"
67
68static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
69
70TAILQ_HEAD(fstypelist, entry) opthead, selhead;
71
72struct entry {
73	char *type;
74	char *options;
75	TAILQ_ENTRY(entry) entries;
76};
77
78static char *options = NULL;
79static int flags = 0;
80static int forceflag = 0;
81
82static int checkfs(const char *, const char *, const char *, char *, pid_t *);
83static int selected(const char *);
84static void addoption(char *);
85static const char *getoptions(const char *);
86static void addentry(struct fstypelist *, const char *, const char *);
87static void maketypelist(char *);
88static void catopt(char **, const char *);
89static void mangle(char *, int *, const char ***, int *);
90static const char *getfslab(const char *);
91static void usage(void) __dead2;
92static int isok(struct fstab *);
93
94int
95main(int argc, char *argv[])
96{
97	struct fstab *fs;
98	int i, rval = 0;
99	const char *vfstype = NULL;
100	char globopt[3];
101
102	globopt[0] = '-';
103	globopt[2] = '\0';
104
105	TAILQ_INIT(&selhead);
106	TAILQ_INIT(&opthead);
107
108	while ((i = getopt(argc, argv, "BdvpfFnyl:t:T:")) != -1)
109		switch (i) {
110		case 'B':
111			if (flags & CHECK_BACKGRD)
112				errx(1, "Cannot specify -B and -F.");
113			flags |= DO_BACKGRD;
114			break;
115
116		case 'd':
117			flags |= CHECK_DEBUG;
118			break;
119
120		case 'v':
121			flags |= CHECK_VERBOSE;
122			break;
123
124		case 'F':
125			if (flags & DO_BACKGRD)
126				errx(1, "Cannot specify -B and -F.");
127			flags |= CHECK_BACKGRD;
128			break;
129
130		case 'p':
131			flags |= CHECK_PREEN;
132			/*FALLTHROUGH*/
133		case 'n':
134		case 'y':
135			globopt[1] = i;
136			catopt(&options, globopt);
137			break;
138
139		case 'f':
140			forceflag = 1;
141			globopt[1] = i;
142			catopt(&options, globopt);
143			break;
144
145		case 'l':
146			warnx("Ignoring obsolete -l option\n");
147			break;
148
149		case 'T':
150			if (*optarg)
151				addoption(optarg);
152			break;
153
154		case 't':
155			if (!TAILQ_EMPTY(&selhead))
156				errx(1, "only one -t option may be specified.");
157
158			maketypelist(optarg);
159			vfstype = optarg;
160			break;
161
162		case '?':
163		default:
164			usage();
165			/* NOTREACHED */
166		}
167
168	argc -= optind;
169	argv += optind;
170
171	if (argc == 0)
172		return checkfstab(flags, isok, checkfs);
173
174#define	BADTYPE(type)							\
175	(strcmp(type, FSTAB_RO) &&					\
176	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
177
178
179	for (; argc--; argv++) {
180		const char *spec, *mntpt, *type, *cp;
181		char device[MAXPATHLEN];
182		struct statfs *mntp;
183
184		spec = *argv;
185		cp = strrchr(spec, '/');
186		if (cp == 0) {
187			(void)snprintf(device, sizeof(device), "%s%s",
188				_PATH_DEV, spec);
189			spec = device;
190		}
191		mntp = getmntpt(spec);
192		if (mntp != NULL) {
193			spec = mntp->f_mntfromname;
194			mntpt = mntp->f_mntonname;
195		}
196		if ((fs = getfsfile(spec)) == NULL &&
197		    (fs = getfsspec(spec)) == NULL) {
198			if (vfstype == NULL)
199				vfstype = getfslab(spec);
200			if (vfstype == NULL)
201				errx(1, "Could not determine filesystem type");
202			type = vfstype;
203			devcheck(spec);
204		} else {
205			spec = fs->fs_spec;
206			type = fs->fs_vfstype;
207			mntpt = fs->fs_file;
208			if (BADTYPE(fs->fs_type))
209				errx(1, "%s has unknown file system type.",
210				    spec);
211		}
212		if ((flags & CHECK_BACKGRD) &&
213		    checkfs(type, spec, mntpt, "-F", NULL) == 0) {
214			printf("%s: DEFER FOR BACKGROUND CHECKING\n", *argv);
215			continue;
216		}
217		if ((flags & DO_BACKGRD) && forceflag == 0 &&
218		    checkfs(type, spec, mntpt, "-F", NULL) != 0)
219			continue;
220
221		rval |= checkfs(type, spec, mntpt, NULL, NULL);
222	}
223
224	return rval;
225}
226
227
228static int
229isok(struct fstab *fs)
230{
231	int i;
232
233	if (fs->fs_passno == 0)
234		return (0);
235	if (BADTYPE(fs->fs_type))
236		return (0);
237	if (!selected(fs->fs_vfstype))
238		return (0);
239	/*
240	 * If the -B flag has been given, then process the needed
241	 * background checks. Background checks cannot be run on
242	 * file systems that will be mounted read-only or that were
243	 * not mounted at boot time (typically those marked `noauto').
244	 * If these basic tests are passed, check with the file system
245	 * itself to see if it is willing to do background checking
246	 * by invoking its check program with the -F flag.
247	 */
248	if (flags & DO_BACKGRD) {
249		if (!strcmp(fs->fs_type, FSTAB_RO))
250			return (0);
251		if (getmntpt(fs->fs_spec) == NULL)
252			return (0);
253		if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
254			return (0);
255		return (1);
256	}
257	/*
258	 * If the -F flag has been given, then consider deferring the
259	 * check to background. Background checks cannot be run on
260	 * file systems that will be mounted read-only or that will
261	 * not be mounted at boot time (e.g., marked `noauto'). If
262	 * these basic tests are passed, check with the file system
263	 * itself to see if it is willing to defer to background
264	 * checking by invoking its check program with the -F flag.
265	 */
266	if ((flags & CHECK_BACKGRD) == 0 || !strcmp(fs->fs_type, FSTAB_RO))
267		return (1);
268	for (i = strlen(fs->fs_mntops) - 6; i >= 0; i--)
269		if (!strncmp(&fs->fs_mntops[i], "noauto", 6))
270			break;
271	if (i >= 0)
272		return (1);
273	if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", NULL) != 0)
274		return (1);
275	printf("%s: DEFER FOR BACKGROUND CHECKING\n", fs->fs_spec);
276	return (0);
277}
278
279
280static int
281checkfs(const char *pvfstype, const char *spec, const char *mntpt,
282    char *auxopt, pid_t *pidp)
283{
284	/* List of directories containing fsck_xxx subcommands. */
285	static const char *edirs[] = {
286		_PATH_SBIN,
287		_PATH_USRSBIN,
288		NULL
289	};
290	const char **argv, **edir;
291	pid_t pid;
292	int argc, i, status, maxargc;
293	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
294	char *vfstype = NULL;
295	const char *extra = NULL;
296
297#ifdef __GNUC__
298	/* Avoid vfork clobbering */
299	(void) &optbuf;
300	(void) &vfstype;
301#endif
302	/*
303	 * We convert the vfstype to lowercase and any spaces to underscores
304	 * to not confuse the issue
305	 */
306	vfstype = strdup(pvfstype);
307	if (vfstype == NULL)
308		perror("strdup(pvfstype)");
309	for (i = 0; i < strlen(vfstype); i++) {
310		vfstype[i] = tolower(vfstype[i]);
311		if (vfstype[i] == ' ')
312			vfstype[i] = '_';
313	}
314
315	extra = getoptions(vfstype);
316	optbuf = NULL;
317	if (options)
318		catopt(&optbuf, options);
319	if (extra)
320		catopt(&optbuf, extra);
321	if (auxopt)
322		catopt(&optbuf, auxopt);
323	else if (flags & DO_BACKGRD)
324		catopt(&optbuf, "-B");
325
326	maxargc = 64;
327	argv = emalloc(sizeof(char *) * maxargc);
328
329	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
330	argc = 0;
331	argv[argc++] = execbase;
332	if (optbuf)
333		mangle(optbuf, &argc, &argv, &maxargc);
334	argv[argc++] = spec;
335	argv[argc] = NULL;
336
337	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
338		(void)printf("start %s %swait", mntpt,
339			pidp ? "no" : "");
340		for (i = 0; i < argc; i++)
341			(void)printf(" %s", argv[i]);
342		(void)printf("\n");
343	}
344
345	switch (pid = vfork()) {
346	case -1:				/* Error. */
347		warn("vfork");
348		if (optbuf)
349			free(optbuf);
350		free(vfstype);
351		return (1);
352
353	case 0:					/* Child. */
354		if ((flags & CHECK_DEBUG) && auxopt == NULL)
355			_exit(0);
356
357		/* Go find an executable. */
358		edir = edirs;
359		do {
360			(void)snprintf(execname,
361			    sizeof(execname), "%s/%s", *edir, execbase);
362			execv(execname, (char * const *)argv);
363			if (errno != ENOENT) {
364				if (spec)
365					warn("exec %s for %s", execname, spec);
366				else
367					warn("exec %s", execname);
368			}
369		} while (*++edir != NULL);
370
371		if (errno == ENOENT) {
372			if (spec)
373				warn("exec %s for %s", execname, spec);
374			else
375				warn("exec %s", execname);
376		}
377		_exit(1);
378		/* NOTREACHED */
379
380	default:				/* Parent. */
381		if (optbuf)
382			free(optbuf);
383
384		free(vfstype);
385
386		if (pidp) {
387			*pidp = pid;
388			return 0;
389		}
390
391		if (waitpid(pid, &status, 0) < 0) {
392			warn("waitpid");
393			return (1);
394		}
395
396		if (WIFEXITED(status)) {
397			if (WEXITSTATUS(status) != 0)
398				return (WEXITSTATUS(status));
399		}
400		else if (WIFSIGNALED(status)) {
401			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
402			return (1);
403		}
404		break;
405	}
406
407	return (0);
408}
409
410
411static int
412selected(const char *type)
413{
414	struct entry *e;
415
416	/* If no type specified, it's always selected. */
417	TAILQ_FOREACH(e, &selhead, entries)
418		if (!strncmp(e->type, type, MFSNAMELEN))
419			return which == IN_LIST ? 1 : 0;
420
421	return which == IN_LIST ? 0 : 1;
422}
423
424
425static const char *
426getoptions(const char *type)
427{
428	struct entry *e;
429
430	TAILQ_FOREACH(e, &opthead, entries)
431		if (!strncmp(e->type, type, MFSNAMELEN))
432			return e->options;
433	return "";
434}
435
436
437static void
438addoption(char *optstr)
439{
440	char *newoptions;
441	struct entry *e;
442
443	if ((newoptions = strchr(optstr, ':')) == NULL)
444		errx(1, "Invalid option string");
445
446	*newoptions++ = '\0';
447
448	TAILQ_FOREACH(e, &opthead, entries)
449		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
450			catopt(&e->options, newoptions);
451			return;
452		}
453	addentry(&opthead, optstr, newoptions);
454}
455
456
457static void
458addentry(struct fstypelist *list, const char *type, const char *opts)
459{
460	struct entry *e;
461
462	e = emalloc(sizeof(struct entry));
463	e->type = estrdup(type);
464	e->options = estrdup(opts);
465	TAILQ_INSERT_TAIL(list, e, entries);
466}
467
468
469static void
470maketypelist(char *fslist)
471{
472	char *ptr;
473
474	if ((fslist == NULL) || (fslist[0] == '\0'))
475		errx(1, "empty type list");
476
477	if (fslist[0] == 'n' && fslist[1] == 'o') {
478		fslist += 2;
479		which = NOT_IN_LIST;
480	}
481	else
482		which = IN_LIST;
483
484	while ((ptr = strsep(&fslist, ",")) != NULL)
485		addentry(&selhead, ptr, "");
486
487}
488
489
490static void
491catopt(char **sp, const char *o)
492{
493	char *s;
494	size_t i, j;
495
496	s = *sp;
497	if (s) {
498		i = strlen(s);
499		j = i + 1 + strlen(o) + 1;
500		s = erealloc(s, j);
501		(void)snprintf(s + i, j, ",%s", o);
502	} else
503		s = estrdup(o);
504	*sp = s;
505}
506
507
508static void
509mangle(char *options, int *argcp, const char ***argvp, int *maxargcp)
510{
511	char *p, *s;
512	int argc, maxargc;
513	const char **argv;
514
515	argc = *argcp;
516	argv = *argvp;
517	maxargc = *maxargcp;
518
519	for (s = options; (p = strsep(&s, ",")) != NULL;) {
520		/* Always leave space for one more argument and the NULL. */
521		if (argc >= maxargc - 3) {
522			maxargc <<= 1;
523			argv = erealloc(argv, maxargc * sizeof(char *));
524		}
525		if (*p != '\0')  {
526			if (*p == '-') {
527				argv[argc++] = p;
528				p = strchr(p, '=');
529				if (p) {
530					*p = '\0';
531					argv[argc++] = p+1;
532				}
533			} else {
534				argv[argc++] = "-o";
535				argv[argc++] = p;
536			}
537		}
538	}
539
540	*argcp = argc;
541	*argvp = argv;
542	*maxargcp = maxargc;
543}
544
545
546const static char *
547getfslab(const char *str)
548{
549	struct disklabel dl;
550	int fd;
551	char p;
552	const char *vfstype;
553	u_char t;
554
555	/* deduce the file system type from the disk label */
556	if ((fd = open(str, O_RDONLY)) == -1)
557		err(1, "cannot open `%s'", str);
558
559	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
560		return(NULL);
561
562	(void) close(fd);
563
564	p = str[strlen(str) - 1];
565
566	if ((p - 'a') >= dl.d_npartitions)
567		errx(1, "partition `%s' is not defined on disk", str);
568
569	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
570		errx(1, "partition `%s' is not of a legal vfstype",
571		    str);
572
573	if ((vfstype = fstypenames[t]) == NULL)
574		errx(1, "vfstype `%s' on partition `%s' is not supported",
575		    fstypenames[t], str);
576
577	return vfstype;
578}
579
580
581static void
582usage(void)
583{
584	static const char common[] =
585	    "[-BFdpvlyn] [-T fstype:fsoptions] [-t fstype]";
586
587	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
588	    getprogname(), common);
589	exit(1);
590}
591