fsck.c revision 121689 
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 121689 2003-10-29 16:09:17Z trhodes $");
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, "BdvpfFnyl: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 'n':
132		case 'y':
133			globopt[1] = i;
134			catopt(&options, globopt);
135			break;
136
137		case 'f':
138			forceflag = 1;
139			globopt[1] = i;
140			catopt(&options, globopt);
141			break;
142
143		case 'l':
144			warnx("Ignoring obsolete -l option\n");
145			break;
146
147		case 'T':
148			if (*optarg)
149				addoption(optarg);
150			break;
151
152		case 't':
153			if (!TAILQ_EMPTY(&selhead))
154				errx(1, "only one -t option may be specified.");
155
156			maketypelist(optarg);
157			vfstype = optarg;
158			break;
159
160		case '?':
161		default:
162			usage();
163			/* NOTREACHED */
164		}
165
166	argc -= optind;
167	argv += optind;
168
169	if (argc == 0)
170		return checkfstab(flags, isok, checkfs);
171
172#define	BADTYPE(type)							\
173	(strcmp(type, FSTAB_RO) &&					\
174	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
175
176
177	for (; argc--; argv++) {
178		const char *spec, *mntpt, *type, *cp;
179		char device[MAXPATHLEN];
180		struct statfs *mntp;
181
182		spec = *argv;
183		cp = strrchr(spec, '/');
184		if (cp == 0) {
185			(void)snprintf(device, sizeof(device), "%s%s",
186				_PATH_DEV, spec);
187			spec = device;
188		}
189		mntp = getmntpt(spec);
190		if (mntp != NULL) {
191			spec = mntp->f_mntfromname;
192			mntpt = mntp->f_mntonname;
193		}
194		if ((fs = getfsfile(spec)) == NULL &&
195		    (fs = getfsspec(spec)) == NULL) {
196			if (vfstype == NULL)
197				vfstype = getfslab(spec);
198			if (vfstype == NULL)
199				errx(1, "Could not determine filesystem type");
200			type = vfstype;
201			devcheck(spec);
202		} else {
203			spec = fs->fs_spec;
204			type = fs->fs_vfstype;
205			mntpt = fs->fs_file;
206			if (BADTYPE(fs->fs_type))
207				errx(1, "%s has unknown file system type.",
208				    spec);
209		}
210		if ((flags & CHECK_BACKGRD) &&
211		    checkfs(type, spec, mntpt, "-F", NULL) == 0) {
212			printf("%s: DEFER FOR BACKGROUND CHECKING\n", *argv);
213			continue;
214		}
215		if ((flags & DO_BACKGRD) && forceflag == 0 &&
216		    checkfs(type, spec, mntpt, "-F", NULL) != 0)
217			continue;
218
219		rval |= checkfs(type, spec, mntpt, NULL, NULL);
220	}
221
222	return rval;
223}
224
225
226static int
227isok(struct fstab *fs)
228{
229	int i;
230
231	if (fs->fs_passno == 0)
232		return (0);
233	if (BADTYPE(fs->fs_type))
234		return (0);
235	if (!selected(fs->fs_vfstype))
236		return (0);
237	/*
238	 * If the -B flag has been given, then process the needed
239	 * background checks. Background checks cannot be run on
240	 * file systems that will be mounted read-only or that were
241	 * not mounted at boot time (typically those marked `noauto').
242	 * If these basic tests are passed, check with the file system
243	 * itself to see if it is willing to do background checking
244	 * by invoking its check program with the -F flag.
245	 */
246	if (flags & DO_BACKGRD) {
247		if (!strcmp(fs->fs_type, FSTAB_RO))
248			return (0);
249		if (getmntpt(fs->fs_spec) == NULL)
250			return (0);
251		if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", 0))
252			return (0);
253		return (1);
254	}
255	/*
256	 * If the -F flag has been given, then consider deferring the
257	 * check to background. Background checks cannot be run on
258	 * file systems that will be mounted read-only or that will
259	 * not be mounted at boot time (e.g., marked `noauto'). If
260	 * these basic tests are passed, check with the file system
261	 * itself to see if it is willing to defer to background
262	 * checking by invoking its check program with the -F flag.
263	 */
264	if ((flags & CHECK_BACKGRD) == 0 || !strcmp(fs->fs_type, FSTAB_RO))
265		return (1);
266	for (i = strlen(fs->fs_mntops) - 6; i >= 0; i--)
267		if (!strncmp(&fs->fs_mntops[i], "noauto", 6))
268			break;
269	if (i >= 0)
270		return (1);
271	if (checkfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, "-F", NULL) != 0)
272		return (1);
273	printf("%s: DEFER FOR BACKGROUND CHECKING\n", fs->fs_spec);
274	return (0);
275}
276
277
278static int
279checkfs(const char *pvfstype, const char *spec, const char *mntpt,
280    char *auxopt, pid_t *pidp)
281{
282	const char **argv;
283	pid_t pid;
284	int argc, i, status, maxargc;
285	char *optbuf, execbase[MAXPATHLEN];
286	char *vfstype = NULL;
287	const char *extra = NULL;
288
289#ifdef __GNUC__
290	/* Avoid vfork clobbering */
291	(void) &optbuf;
292	(void) &vfstype;
293#endif
294	/*
295	 * We convert the vfstype to lowercase and any spaces to underscores
296	 * to not confuse the issue
297	 *
298	 * XXX This is a kludge to make automatic filesystem type guessing
299	 * from the disklabel work for "4.2BSD" filesystems.  It does a
300	 * very limited subset of transliteration to a normalised form of
301	 * filesystem name, and we do not seem to enforce a filesystem
302	 * name character set.
303	 */
304	vfstype = strdup(pvfstype);
305	if (vfstype == NULL)
306		perror("strdup(pvfstype)");
307	for (i = 0; i < strlen(vfstype); i++) {
308		vfstype[i] = tolower(vfstype[i]);
309		if (vfstype[i] == ' ')
310			vfstype[i] = '_';
311	}
312
313	extra = getoptions(vfstype);
314	optbuf = NULL;
315	if (options)
316		catopt(&optbuf, options);
317	if (extra)
318		catopt(&optbuf, extra);
319	if (auxopt)
320		catopt(&optbuf, auxopt);
321	else if (flags & DO_BACKGRD)
322		catopt(&optbuf, "-B");
323
324	maxargc = 64;
325	argv = emalloc(sizeof(char *) * maxargc);
326
327	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
328	argc = 0;
329	argv[argc++] = execbase;
330	if (optbuf)
331		mangle(optbuf, &argc, &argv, &maxargc);
332	argv[argc++] = spec;
333	argv[argc] = NULL;
334
335	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
336		(void)printf("start %s %swait", mntpt,
337			pidp ? "no" : "");
338		for (i = 0; i < argc; i++)
339			(void)printf(" %s", argv[i]);
340		(void)printf("\n");
341	}
342
343	switch (pid = vfork()) {
344	case -1:				/* Error. */
345		warn("vfork");
346		if (optbuf)
347			free(optbuf);
348		free(vfstype);
349		return (1);
350
351	case 0:					/* Child. */
352		if ((flags & CHECK_DEBUG) && auxopt == NULL)
353			_exit(0);
354
355		/* Go find an executable. */
356		execvP(execbase, _PATH_SYSPATH, (char * const *)argv);
357		if (spec)
358			warn("exec %s for %s in %s", execbase, spec, _PATH_SYSPATH);
359		else
360			warn("exec %s in %s", execbase, _PATH_SYSPATH);
361		_exit(1);
362		/* NOTREACHED */
363
364	default:				/* Parent. */
365		if (optbuf)
366			free(optbuf);
367
368		free(vfstype);
369
370		if (pidp) {
371			*pidp = pid;
372			return 0;
373		}
374
375		if (waitpid(pid, &status, 0) < 0) {
376			warn("waitpid");
377			return (1);
378		}
379
380		if (WIFEXITED(status)) {
381			if (WEXITSTATUS(status) != 0)
382				return (WEXITSTATUS(status));
383		}
384		else if (WIFSIGNALED(status)) {
385			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
386			return (1);
387		}
388		break;
389	}
390
391	return (0);
392}
393
394
395static int
396selected(const char *type)
397{
398	struct entry *e;
399
400	/* If no type specified, it's always selected. */
401	TAILQ_FOREACH(e, &selhead, entries)
402		if (!strncmp(e->type, type, MFSNAMELEN))
403			return which == IN_LIST ? 1 : 0;
404
405	return which == IN_LIST ? 0 : 1;
406}
407
408
409static const char *
410getoptions(const char *type)
411{
412	struct entry *e;
413
414	TAILQ_FOREACH(e, &opthead, entries)
415		if (!strncmp(e->type, type, MFSNAMELEN))
416			return e->options;
417	return "";
418}
419
420
421static void
422addoption(char *optstr)
423{
424	char *newoptions;
425	struct entry *e;
426
427	if ((newoptions = strchr(optstr, ':')) == NULL)
428		errx(1, "Invalid option string");
429
430	*newoptions++ = '\0';
431
432	TAILQ_FOREACH(e, &opthead, entries)
433		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
434			catopt(&e->options, newoptions);
435			return;
436		}
437	addentry(&opthead, optstr, newoptions);
438}
439
440
441static void
442addentry(struct fstypelist *list, const char *type, const char *opts)
443{
444	struct entry *e;
445
446	e = emalloc(sizeof(struct entry));
447	e->type = estrdup(type);
448	e->options = estrdup(opts);
449	TAILQ_INSERT_TAIL(list, e, entries);
450}
451
452
453static void
454maketypelist(char *fslist)
455{
456	char *ptr;
457
458	if ((fslist == NULL) || (fslist[0] == '\0'))
459		errx(1, "empty type list");
460
461	if (fslist[0] == 'n' && fslist[1] == 'o') {
462		fslist += 2;
463		which = NOT_IN_LIST;
464	}
465	else
466		which = IN_LIST;
467
468	while ((ptr = strsep(&fslist, ",")) != NULL)
469		addentry(&selhead, ptr, "");
470
471}
472
473
474static void
475catopt(char **sp, const char *o)
476{
477	char *s;
478	size_t i, j;
479
480	s = *sp;
481	if (s) {
482		i = strlen(s);
483		j = i + 1 + strlen(o) + 1;
484		s = erealloc(s, j);
485		(void)snprintf(s + i, j, ",%s", o);
486	} else
487		s = estrdup(o);
488	*sp = s;
489}
490
491
492static void
493mangle(char *options, int *argcp, const char ***argvp, int *maxargcp)
494{
495	char *p, *s;
496	int argc, maxargc;
497	const char **argv;
498
499	argc = *argcp;
500	argv = *argvp;
501	maxargc = *maxargcp;
502
503	for (s = options; (p = strsep(&s, ",")) != NULL;) {
504		/* Always leave space for one more argument and the NULL. */
505		if (argc >= maxargc - 3) {
506			maxargc <<= 1;
507			argv = erealloc(argv, maxargc * sizeof(char *));
508		}
509		if (*p != '\0')  {
510			if (*p == '-') {
511				argv[argc++] = p;
512				p = strchr(p, '=');
513				if (p) {
514					*p = '\0';
515					argv[argc++] = p+1;
516				}
517			} else {
518				argv[argc++] = "-o";
519				argv[argc++] = p;
520			}
521		}
522	}
523
524	*argcp = argc;
525	*argvp = argv;
526	*maxargcp = maxargc;
527}
528
529
530const static char *
531getfslab(const char *str)
532{
533	struct disklabel dl;
534	int fd;
535	char p;
536	const char *vfstype;
537	u_char t;
538
539	/* deduce the file system type from the disk label */
540	if ((fd = open(str, O_RDONLY)) == -1)
541		err(1, "cannot open `%s'", str);
542
543	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
544		return(NULL);
545
546	(void) close(fd);
547
548	p = str[strlen(str) - 1];
549
550	if ((p - 'a') >= dl.d_npartitions)
551		errx(1, "partition `%s' is not defined on disk", str);
552
553	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
554		errx(1, "partition `%s' is not of a legal vfstype",
555		    str);
556
557	if ((vfstype = fstypenames[t]) == NULL)
558		errx(1, "vfstype `%s' on partition `%s' is not supported",
559		    fstypenames[t], str);
560
561	return vfstype;
562}
563
564
565static void
566usage(void)
567{
568	static const char common[] =
569	    "[-BFdfnpvy] [-T fstype:fsoptions] [-t fstype]";
570
571	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
572	    getprogname(), common);
573	exit(1);
574}
575