fsck.c revision 95258 
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 95258 2002-04-22 13:44:47Z des $");
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			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	 * filesystems 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 filesystem
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	 * filesystems 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 filesystem
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	/* List of directories containing fsck_xxx subcommands. */
283	static const char *edirs[] = {
284		_PATH_SBIN,
285		_PATH_USRSBIN,
286		NULL
287	};
288	const char **argv, **edir;
289	pid_t pid;
290	int argc, i, status, maxargc;
291	char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
292	char *vfstype = NULL;
293	const char *extra = NULL;
294
295#ifdef __GNUC__
296	/* Avoid vfork clobbering */
297	(void) &optbuf;
298	(void) &vfstype;
299#endif
300	/*
301	 * We convert the vfstype to lowercase and any spaces to underscores
302	 * to not confuse the issue
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		edir = edirs;
357		do {
358			(void)snprintf(execname,
359			    sizeof(execname), "%s/%s", *edir, execbase);
360			execv(execname, (char * const *)argv);
361			if (errno != ENOENT) {
362				if (spec)
363					warn("exec %s for %s", execname, spec);
364				else
365					warn("exec %s", execname);
366			}
367		} while (*++edir != NULL);
368
369		if (errno == ENOENT) {
370			if (spec)
371				warn("exec %s for %s", execname, spec);
372			else
373				warn("exec %s", execname);
374		}
375		_exit(1);
376		/* NOTREACHED */
377
378	default:				/* Parent. */
379		if (optbuf)
380			free(optbuf);
381
382		free(vfstype);
383
384		if (pidp) {
385			*pidp = pid;
386			return 0;
387		}
388
389		if (waitpid(pid, &status, 0) < 0) {
390			warn("waitpid");
391			return (1);
392		}
393
394		if (WIFEXITED(status)) {
395			if (WEXITSTATUS(status) != 0)
396				return (WEXITSTATUS(status));
397		}
398		else if (WIFSIGNALED(status)) {
399			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
400			return (1);
401		}
402		break;
403	}
404
405	return (0);
406}
407
408
409static int
410selected(const char *type)
411{
412	struct entry *e;
413
414	/* If no type specified, it's always selected. */
415	TAILQ_FOREACH(e, &selhead, entries)
416		if (!strncmp(e->type, type, MFSNAMELEN))
417			return which == IN_LIST ? 1 : 0;
418
419	return which == IN_LIST ? 0 : 1;
420}
421
422
423static const char *
424getoptions(const char *type)
425{
426	struct entry *e;
427
428	TAILQ_FOREACH(e, &opthead, entries)
429		if (!strncmp(e->type, type, MFSNAMELEN))
430			return e->options;
431	return "";
432}
433
434
435static void
436addoption(char *optstr)
437{
438	char *newoptions;
439	struct entry *e;
440
441	if ((newoptions = strchr(optstr, ':')) == NULL)
442		errx(1, "Invalid option string");
443
444	*newoptions++ = '\0';
445
446	TAILQ_FOREACH(e, &opthead, entries)
447		if (!strncmp(e->type, optstr, MFSNAMELEN)) {
448			catopt(&e->options, newoptions);
449			return;
450		}
451	addentry(&opthead, optstr, newoptions);
452}
453
454
455static void
456addentry(struct fstypelist *list, const char *type, const char *opts)
457{
458	struct entry *e;
459
460	e = emalloc(sizeof(struct entry));
461	e->type = estrdup(type);
462	e->options = estrdup(opts);
463	TAILQ_INSERT_TAIL(list, e, entries);
464}
465
466
467static void
468maketypelist(char *fslist)
469{
470	char *ptr;
471
472	if ((fslist == NULL) || (fslist[0] == '\0'))
473		errx(1, "empty type list");
474
475	if (fslist[0] == 'n' && fslist[1] == 'o') {
476		fslist += 2;
477		which = NOT_IN_LIST;
478	}
479	else
480		which = IN_LIST;
481
482	while ((ptr = strsep(&fslist, ",")) != NULL)
483		addentry(&selhead, ptr, "");
484
485}
486
487
488static void
489catopt(char **sp, const char *o)
490{
491	char *s;
492	size_t i, j;
493
494	s = *sp;
495	if (s) {
496		i = strlen(s);
497		j = i + 1 + strlen(o) + 1;
498		s = erealloc(s, j);
499		(void)snprintf(s + i, j, ",%s", o);
500	} else
501		s = estrdup(o);
502	*sp = s;
503}
504
505
506static void
507mangle(char *options, int *argcp, const char ***argvp, int *maxargcp)
508{
509	char *p, *s;
510	int argc, maxargc;
511	const char **argv;
512
513	argc = *argcp;
514	argv = *argvp;
515	maxargc = *maxargcp;
516
517	for (s = options; (p = strsep(&s, ",")) != NULL;) {
518		/* Always leave space for one more argument and the NULL. */
519		if (argc >= maxargc - 3) {
520			maxargc <<= 1;
521			argv = erealloc(argv, maxargc * sizeof(char *));
522		}
523		if (*p != '\0')  {
524			if (*p == '-') {
525				argv[argc++] = p;
526				p = strchr(p, '=');
527				if (p) {
528					*p = '\0';
529					argv[argc++] = p+1;
530				}
531			} else {
532				argv[argc++] = "-o";
533				argv[argc++] = p;
534			}
535		}
536	}
537
538	*argcp = argc;
539	*argvp = argv;
540	*maxargcp = maxargc;
541}
542
543
544const static char *
545getfslab(const char *str)
546{
547	struct disklabel dl;
548	int fd;
549	char p;
550	const char *vfstype;
551	u_char t;
552
553	/* deduce the filesystem type from the disk label */
554	if ((fd = open(str, O_RDONLY)) == -1)
555		err(1, "cannot open `%s'", str);
556
557	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
558		err(1, "cannot get disklabel for `%s'", str);
559
560	(void) close(fd);
561
562	p = str[strlen(str) - 1];
563
564	if ((p - 'a') >= dl.d_npartitions)
565		errx(1, "partition `%s' is not defined on disk", str);
566
567	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
568		errx(1, "partition `%s' is not of a legal vfstype",
569		    str);
570
571	if ((vfstype = fstypenames[t]) == NULL)
572		errx(1, "vfstype `%s' on partition `%s' is not supported",
573		    fstypenames[t], str);
574
575	return vfstype;
576}
577
578
579static void
580usage(void)
581{
582	static const char common[] =
583	    "[-BFdpvlyn] [-T fstype:fsoptions] [-t fstype]";
584
585	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
586	    getprogname(), common);
587	exit(1);
588}
589