fsck.c revision 267654 
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: releng/9.3/sbin/fsck/fsck.c 199582 2009-11-20 15:27:00Z netchild $");
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#include <sys/disklabel.h>
50#include <sys/ioctl.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <errno.h>
55#include <fstab.h>
56#include <fcntl.h>
57#include <paths.h>
58#include <signal.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#include "fsutil.h"
65
66static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
67
68TAILQ_HEAD(fstypelist, entry) opthead, selhead;
69
70struct entry {
71	char *type;
72	char *options;
73	TAILQ_ENTRY(entry) entries;
74};
75
76static char *options = NULL;
77static int flags = 0;
78static int forceflag = 0;
79
80static int checkfs(const char *, const char *, const char *, char *, pid_t *);
81static int selected(const char *);
82static void addoption(char *);
83static const char *getoptions(const char *);
84static void addentry(struct fstypelist *, const char *, const char *);
85static void maketypelist(char *);
86static void catopt(char **, const char *);
87static void mangle(char *, int *, const char ***, int *);
88static const char *getfslab(const char *);
89static void usage(void) __dead2;
90static int isok(struct fstab *);
91
92int
93main(int argc, char *argv[])
94{
95	struct fstab *fs;
96	int i, rval = 0;
97	const char *vfstype = NULL;
98	char globopt[3];
99
100	globopt[0] = '-';
101	globopt[2] = '\0';
102
103	TAILQ_INIT(&selhead);
104	TAILQ_INIT(&opthead);
105
106	while ((i = getopt(argc, argv, "BCdvpfFnyl:t:T:")) != -1)
107		switch (i) {
108		case 'B':
109			if (flags & CHECK_BACKGRD)
110				errx(1, "Cannot specify -B and -F.");
111			flags |= DO_BACKGRD;
112			break;
113
114		case 'd':
115			flags |= CHECK_DEBUG;
116			break;
117
118		case 'v':
119			flags |= CHECK_VERBOSE;
120			break;
121
122		case 'F':
123			if (flags & DO_BACKGRD)
124				errx(1, "Cannot specify -B and -F.");
125			flags |= CHECK_BACKGRD;
126			break;
127
128		case 'p':
129			flags |= CHECK_PREEN;
130			/*FALLTHROUGH*/
131		case 'C':
132			flags |= CHECK_CLEAN;
133			/*FALLTHROUGH*/
134		case 'n':
135		case 'y':
136			globopt[1] = i;
137			catopt(&options, globopt);
138			break;
139
140		case 'f':
141			forceflag = 1;
142			globopt[1] = i;
143			catopt(&options, globopt);
144			break;
145
146		case 'l':
147			warnx("Ignoring obsolete -l option\n");
148			break;
149
150		case 'T':
151			if (*optarg)
152				addoption(optarg);
153			break;
154
155		case 't':
156			if (!TAILQ_EMPTY(&selhead))
157				errx(1, "only one -t option may be specified.");
158
159			maketypelist(optarg);
160			vfstype = optarg;
161			break;
162
163		case '?':
164		default:
165			usage();
166			/* NOTREACHED */
167		}
168
169	argc -= optind;
170	argv += optind;
171
172	if (argc == 0)
173		return checkfstab(flags, isok, checkfs);
174
175#define	BADTYPE(type)							\
176	(strcmp(type, FSTAB_RO) &&					\
177	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
178
179
180	for (; argc--; argv++) {
181		const char *spec, *mntpt, *type, *cp;
182		char device[MAXPATHLEN];
183		struct statfs *mntp;
184
185		spec = *argv;
186		cp = strrchr(spec, '/');
187		if (cp == 0) {
188			(void)snprintf(device, sizeof(device), "%s%s",
189				_PATH_DEV, spec);
190			spec = device;
191		}
192		mntp = getmntpt(spec);
193		if (mntp != NULL) {
194			spec = mntp->f_mntfromname;
195			mntpt = mntp->f_mntonname;
196		}
197		if ((fs = getfsfile(spec)) == NULL &&
198		    (fs = getfsspec(spec)) == NULL) {
199			if (vfstype == NULL)
200				vfstype = getfslab(spec);
201			if (vfstype == NULL)
202				errx(1, "Could not determine filesystem type");
203			type = vfstype;
204			devcheck(spec);
205		} else {
206			spec = fs->fs_spec;
207			type = fs->fs_vfstype;
208			mntpt = fs->fs_file;
209			if (BADTYPE(fs->fs_type))
210				errx(1, "%s has unknown file system type.",
211				    spec);
212		}
213		if ((flags & CHECK_BACKGRD) &&
214		    checkfs(type, spec, mntpt, "-F", NULL) == 0) {
215			printf("%s: DEFER FOR BACKGROUND CHECKING\n", *argv);
216			continue;
217		}
218		if ((flags & DO_BACKGRD) && forceflag == 0 &&
219		    checkfs(type, spec, mntpt, "-F", NULL) != 0)
220			continue;
221
222		rval |= checkfs(type, spec, mntpt, NULL, NULL);
223	}
224
225	return rval;
226}
227
228
229static int
230isok(struct fstab *fs)
231{
232	int i;
233
234	if (fs->fs_passno == 0)
235		return (0);
236	if (BADTYPE(fs->fs_type))
237		return (0);
238	if (!selected(fs->fs_vfstype))
239		return (0);
240	/*
241	 * If the -B flag has been given, then process the needed
242	 * background checks. Background checks cannot be run on
243	 * file systems that will be mounted read-only or that were
244	 * not mounted at boot time (typically those marked `noauto').
245	 * If these basic tests are passed, check with the file system
246	 * itself to see if it is willing to do background checking
247	 * by invoking its check program with the -F flag.
248	 */
249	if (flags & DO_BACKGRD) {
250		if (!strcmp(fs->fs_type, FSTAB_RO))
251			return (0);
252		if (getmntpt(fs->fs_spec) == NULL)
253			return (0);
254		if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
255			return (0);
256		return (1);
257	}
258	/*
259	 * If the -F flag has been given, then consider deferring the
260	 * check to background. Background checks cannot be run on
261	 * file systems that will be mounted read-only or that will
262	 * not be mounted at boot time (e.g., marked `noauto'). If
263	 * these basic tests are passed, check with the file system
264	 * itself to see if it is willing to defer to background
265	 * checking by invoking its check program with the -F flag.
266	 */
267	if ((flags & CHECK_BACKGRD) == 0 || !strcmp(fs->fs_type, FSTAB_RO))
268		return (1);
269	for (i = strlen(fs->fs_mntops) - 6; i >= 0; i--)
270		if (!strncmp(&fs->fs_mntops[i], "noauto", 6))
271			break;
272	if (i >= 0)
273		return (1);
274	if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", NULL) != 0)
275		return (1);
276	printf("%s: DEFER FOR BACKGROUND CHECKING\n", fs->fs_spec);
277	return (0);
278}
279
280
281static int
282checkfs(const char *pvfstype, const char *spec, const char *mntpt,
283    char *auxopt, pid_t *pidp)
284{
285	const char **argv;
286	pid_t pid;
287	int argc, i, status, maxargc;
288	char *optbuf, execbase[MAXPATHLEN];
289	char *vfstype = NULL;
290	const char *extra = NULL;
291
292#ifdef __GNUC__
293	/* Avoid vfork clobbering */
294	(void) &optbuf;
295	(void) &vfstype;
296#endif
297	/*
298	 * We convert the vfstype to lowercase and any spaces to underscores
299	 * to not confuse the issue
300	 *
301	 * XXX This is a kludge to make automatic filesystem type guessing
302	 * from the disklabel work for "4.2BSD" filesystems.  It does a
303	 * very limited subset of transliteration to a normalised form of
304	 * filesystem name, and we do not seem to enforce a filesystem
305	 * name character set.
306	 */
307	vfstype = strdup(pvfstype);
308	if (vfstype == NULL)
309		perror("strdup(pvfstype)");
310	for (i = 0; i < strlen(vfstype); i++) {
311		vfstype[i] = tolower(vfstype[i]);
312		if (vfstype[i] == ' ')
313			vfstype[i] = '_';
314	}
315
316	extra = getoptions(vfstype);
317	optbuf = NULL;
318	if (options)
319		catopt(&optbuf, options);
320	if (extra)
321		catopt(&optbuf, extra);
322	if (auxopt)
323		catopt(&optbuf, auxopt);
324	else if (flags & DO_BACKGRD)
325		catopt(&optbuf, "-B");
326
327	maxargc = 64;
328	argv = emalloc(sizeof(char *) * maxargc);
329
330	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
331	argc = 0;
332	argv[argc++] = execbase;
333	if (optbuf)
334		mangle(optbuf, &argc, &argv, &maxargc);
335	argv[argc++] = spec;
336	argv[argc] = NULL;
337
338	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
339		(void)printf("start %s %swait", mntpt,
340			pidp ? "no" : "");
341		for (i = 0; i < argc; i++)
342			(void)printf(" %s", argv[i]);
343		(void)printf("\n");
344	}
345
346	switch (pid = vfork()) {
347	case -1:				/* Error. */
348		warn("vfork");
349		if (optbuf)
350			free(optbuf);
351		free(vfstype);
352		return (1);
353
354	case 0:					/* Child. */
355		if ((flags & CHECK_DEBUG) && auxopt == NULL)
356			_exit(0);
357
358		/* Go find an executable. */
359		execvP(execbase, _PATH_SYSPATH, (char * const *)argv);
360		if (spec)
361			warn("exec %s for %s in %s", execbase, spec, _PATH_SYSPATH);
362		else
363			warn("exec %s in %s", execbase, _PATH_SYSPATH);
364		_exit(1);
365		/* NOTREACHED */
366
367	default:				/* Parent. */
368		if (optbuf)
369			free(optbuf);
370
371		free(vfstype);
372
373		if (pidp) {
374			*pidp = pid;
375			return 0;
376		}
377
378		if (waitpid(pid, &status, 0) < 0) {
379			warn("waitpid");
380			return (1);
381		}
382
383		if (WIFEXITED(status)) {
384			if (WEXITSTATUS(status) != 0)
385				return (WEXITSTATUS(status));
386		}
387		else if (WIFSIGNALED(status)) {
388			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
389			return (1);
390		}
391		break;
392	}
393
394	return (0);
395}
396
397
398static int
399selected(const char *type)
400{
401	struct entry *e;
402
403	/* If no type specified, it's always selected. */
404	TAILQ_FOREACH(e, &selhead, entries)
405		if (!strncmp(e->type, type, MFSNAMELEN))
406			return which == IN_LIST ? 1 : 0;
407
408	return which == IN_LIST ? 0 : 1;
409}
410
411
412static const char *
413getoptions(const char *type)
414{
415	struct entry *e;
416
417	TAILQ_FOREACH(e, &opthead, entries)
418		if (!strncmp(e->type, type, MFSNAMELEN))
419			return e->options;
420	return "";
421}
422
423
424static void
425addoption(char *optstr)
426{
427	char *newoptions;
428	struct entry *e;
429
430	if ((newoptions = strchr(optstr, ':')) == NULL)
431		errx(1, "Invalid option string");
432
433	*newoptions++ = '\0';
434
435	TAILQ_FOREACH(e, &opthead, entries)
436		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
437			catopt(&e->options, newoptions);
438			return;
439		}
440	addentry(&opthead, optstr, newoptions);
441}
442
443
444static void
445addentry(struct fstypelist *list, const char *type, const char *opts)
446{
447	struct entry *e;
448
449	e = emalloc(sizeof(struct entry));
450	e->type = estrdup(type);
451	e->options = estrdup(opts);
452	TAILQ_INSERT_TAIL(list, e, entries);
453}
454
455
456static void
457maketypelist(char *fslist)
458{
459	char *ptr;
460
461	if ((fslist == NULL) || (fslist[0] == '\0'))
462		errx(1, "empty type list");
463
464	if (fslist[0] == 'n' && fslist[1] == 'o') {
465		fslist += 2;
466		which = NOT_IN_LIST;
467	}
468	else
469		which = IN_LIST;
470
471	while ((ptr = strsep(&fslist, ",")) != NULL)
472		addentry(&selhead, ptr, "");
473
474}
475
476
477static void
478catopt(char **sp, const char *o)
479{
480	char *s;
481	size_t i, j;
482
483	s = *sp;
484	if (s) {
485		i = strlen(s);
486		j = i + 1 + strlen(o) + 1;
487		s = erealloc(s, j);
488		(void)snprintf(s + i, j, ",%s", o);
489	} else
490		s = estrdup(o);
491	*sp = s;
492}
493
494
495static void
496mangle(char *options, int *argcp, const char ***argvp, int *maxargcp)
497{
498	char *p, *s;
499	int argc, maxargc;
500	const char **argv;
501
502	argc = *argcp;
503	argv = *argvp;
504	maxargc = *maxargcp;
505
506	for (s = options; (p = strsep(&s, ",")) != NULL;) {
507		/* Always leave space for one more argument and the NULL. */
508		if (argc >= maxargc - 3) {
509			maxargc <<= 1;
510			argv = erealloc(argv, maxargc * sizeof(char *));
511		}
512		if (*p != '\0')  {
513			if (*p == '-') {
514				argv[argc++] = p;
515				p = strchr(p, '=');
516				if (p) {
517					*p = '\0';
518					argv[argc++] = p+1;
519				}
520			} else {
521				argv[argc++] = "-o";
522				argv[argc++] = p;
523			}
524		}
525	}
526
527	*argcp = argc;
528	*argvp = argv;
529	*maxargcp = maxargc;
530}
531
532
533const static char *
534getfslab(const char *str)
535{
536	struct disklabel dl;
537	int fd;
538	char p;
539	const char *vfstype;
540	u_char t;
541
542	/* deduce the file system type from the disk label */
543	if ((fd = open(str, O_RDONLY)) == -1)
544		err(1, "cannot open `%s'", str);
545
546	if (ioctl(fd, DIOCGDINFO, &dl) == -1) {
547		(void) close(fd);
548		return(NULL);
549	}
550
551	(void) close(fd);
552
553	p = str[strlen(str) - 1];
554
555	if ((p - 'a') >= dl.d_npartitions)
556		errx(1, "partition `%s' is not defined on disk", str);
557
558	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
559		errx(1, "partition `%s' is not of a legal vfstype",
560		    str);
561
562	if ((vfstype = fstypenames[t]) == NULL)
563		errx(1, "vfstype `%s' on partition `%s' is not supported",
564		    fstypenames[t], str);
565
566	return vfstype;
567}
568
569
570static void
571usage(void)
572{
573	static const char common[] =
574	    "[-Cdfnpvy] [-B | -F] [-T fstype:fsoptions] [-t fstype]";
575
576	(void)fprintf(stderr, "usage: %s %s [special | node] ...\n",
577	    getprogname(), common);
578	exit(1);
579}
580