xref: /netbsd/sbin/fsck/fsck.c (revision 6550d01e) 
1 /*	$NetBSD: fsck.c,v 1.49 2010/02/24 13:56:07 hannken 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. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * From: @(#)mount.c	8.19 (Berkeley) 4/19/94
33  * From: NetBSD: mount.c,v 1.24 1995/11/18 03:34:29 cgd Exp
34  *
35  */
36 
37 #include <sys/cdefs.h>
38 #ifndef lint
39 __RCSID("$NetBSD: fsck.c,v 1.49 2010/02/24 13:56:07 hannken Exp $");
40 #endif /* not lint */
41 
42 #include <sys/param.h>
43 #include <sys/mount.h>
44 #include <sys/queue.h>
45 #include <sys/wait.h>
46 #define FSTYPENAMES
47 #define FSCKNAMES
48 #include <sys/disk.h>
49 #include <sys/disklabel.h>
50 #include <sys/ioctl.h>
51 
52 #include <err.h>
53 #include <errno.h>
54 #include <fstab.h>
55 #include <fcntl.h>
56 #include <paths.h>
57 #include <signal.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62 #include <util.h>
63 
64 #include "pathnames.h"
65 #include "fsutil.h"
66 #include "exitvalues.h"
67 
68 static enum { IN_LIST, NOT_IN_LIST } which = NOT_IN_LIST;
69 
70 TAILQ_HEAD(fstypelist, entry) opthead, selhead, omhead;
71 
72 struct entry {
73 	char *type;
74 	char *options;
75 	TAILQ_ENTRY(entry) entries;
76 };
77 
78 static int maxrun = 0;
79 static char *options = NULL;
80 static int flags = 0;
81 
82 static int checkfs(const char *, const char *, const char *, void *, pid_t *);
83 static int selected(const char *);
84 static int omitted(const char *);
85 static void addoption(char *);
86 static const char *getoptions(const char *);
87 static void addentry(struct fstypelist *, const char *, const char *);
88 static void maketypelist(char *);
89 static void catopt(char **, const char *);
90 static void mangle(char *, int *, const char ** volatile *, int *);
91 static const char *getfslab(const char *);
92 static void usage(void);
93 static void *isok(struct fstab *);
94 
95 int
96 main(int argc, char *argv[])
97 {
98 	struct fstab *fs;
99 	int i, rval;
100 	const char *vfstype = NULL;
101 	char globopt[3];
102 	int ret = FSCK_EXIT_OK;
103 
104 	globopt[0] = '-';
105 	globopt[2] = '\0';
106 
107 	TAILQ_INIT(&selhead);
108 	TAILQ_INIT(&opthead);
109 	TAILQ_INIT(&omhead);
110 
111 	while ((i = getopt(argc, argv, "dfl:nPpqT:t:vx:y")) != -1) {
112 		switch (i) {
113 		case 'd':
114 			flags |= CHECK_DEBUG;
115 			continue;
116 
117 		case 'f':
118 			flags |= CHECK_FORCE;
119 			break;
120 
121 		case 'n':
122 			flags |= CHECK_NOFIX;
123 			break;
124 
125 		case 'p':
126 			flags |= CHECK_PREEN;
127 			break;
128 
129 		case 'P':
130 			flags |= CHECK_PROGRESS;
131 			break;
132 
133 		case 'q':
134 			break;
135 
136 		case 'l':
137 			maxrun = atoi(optarg);
138 			continue;
139 
140 		case 'T':
141 			if (*optarg)
142 				addoption(optarg);
143 			continue;
144 
145 		case 't':
146 			if (TAILQ_FIRST(&selhead) != NULL)
147 				errx(1, "only one -t option may be specified.");
148 
149 			maketypelist(optarg);
150 			vfstype = optarg;
151 			continue;
152 
153 		case 'v':
154 			flags |= CHECK_VERBOSE;
155 			continue;
156 
157 		case 'x':
158 			addentry(&omhead, optarg, "");
159 			continue;
160 
161 		case 'y':
162 			break;
163 
164 		case '?':
165 		default:
166 			usage();
167 			/* NOTREACHED */
168 		}
169 
170 		/* Pass option to fsck_xxxfs */
171 		globopt[1] = i;
172 		catopt(&options, globopt);
173 	}
174 
175 	/* Don't do progress meters if we're debugging. */
176 	if (flags & CHECK_DEBUG)
177 		flags &= ~CHECK_PROGRESS;
178 
179 	/*
180 	 * If progress meters are being used, force max parallel to 1
181 	 * so the progress meter outputs don't interfere with one another.
182 	 */
183 	if (flags & CHECK_PROGRESS)
184 		maxrun = 1;
185 
186 	argc -= optind;
187 	argv += optind;
188 
189 	if (argc == 0)
190 		return checkfstab(flags, maxrun, isok, checkfs);
191 
192 #define	BADTYPE(type)							\
193 	(strcmp(type, FSTAB_RO) &&					\
194 	    strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ))
195 
196 
197 	for (; argc--; argv++) {
198 		const char *spec, *type, *cp;
199 		char	device[MAXPATHLEN];
200 
201 		spec = *argv;
202 		cp = strrchr(spec, '/');
203 		if (cp == 0) {
204 			(void)snprintf(device, sizeof(device), "%s%s",
205 				_PATH_DEV, spec);
206 			spec = device;
207 		}
208 		if ((fs = getfsfile(spec)) == NULL &&
209 		    (fs = getfsspec(spec)) == NULL) {
210 			if (vfstype == NULL)
211 				vfstype = getfslab(spec);
212 			type = vfstype;
213 		}
214 		else {
215 			spec = fs->fs_spec;
216 			type = fs->fs_vfstype;
217 			if (BADTYPE(fs->fs_type))
218 				errx(FSCK_EXIT_CHECK_FAILED,
219 				    "%s has unknown file system type.",
220 				    spec);
221 		}
222 
223 		rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
224 		if (rval > ret)
225 			ret = rval;
226 	}
227 
228 	return ret;
229 }
230 
231 
232 static void *
233 isok(struct fstab *fs)
234 {
235 
236 	if (fs->fs_passno == 0)
237 		return NULL;
238 
239 	if (BADTYPE(fs->fs_type))
240 		return NULL;
241 
242 	if (!selected(fs->fs_vfstype))
243 		return NULL;
244 
245 	if (omitted(fs->fs_file))
246 		return NULL;
247 
248 	return fs;
249 }
250 
251 
252 static int
253 checkfs(const char *vfst, const char *spec, const char *mntpt, void *auxarg,
254     pid_t *pidp)
255 {
256 	/* List of directories containing fsck_xxx subcommands. */
257 	static const char *edirs[] = {
258 #ifdef RESCUEDIR
259 		RESCUEDIR,
260 #endif
261 		_PATH_SBIN,
262 		_PATH_USRSBIN,
263 		NULL
264 	};
265 	const char ** volatile argv, **edir;
266 	const char * volatile vfstype = vfst;
267 	pid_t pid;
268 	int argc, i, status, maxargc;
269 	char *optb;
270 	char *volatile optbuf;
271 	char execname[MAXPATHLEN + 1], execbase[MAXPATHLEN];
272 	const char *extra = getoptions(vfstype);
273 
274 	if (!strcmp(vfstype, "ufs"))
275 		vfstype = MOUNT_UFS;
276 
277 	optb = NULL;
278 	if (options)
279 		catopt(&optb, options);
280 	if (extra)
281 		catopt(&optb, extra);
282 	optbuf = optb;
283 
284 	maxargc = 64;
285 	argv = emalloc(sizeof(char *) * maxargc);
286 
287 	(void) snprintf(execbase, sizeof(execbase), "fsck_%s", vfstype);
288 	argc = 0;
289 	argv[argc++] = execbase;
290 	if (optbuf)
291 		mangle(optbuf, &argc, &argv, &maxargc);
292 	argv[argc++] = spec;
293 	argv[argc] = NULL;
294 
295 	if (flags & (CHECK_DEBUG|CHECK_VERBOSE)) {
296 		(void)printf("start %s %swait", mntpt,
297 			pidp ? "no" : "");
298 		for (i = 0; i < argc; i++)
299 			(void)printf(" %s", argv[i]);
300 		(void)printf("\n");
301 	}
302 
303 	switch (pid = vfork()) {
304 	case -1:				/* Error. */
305 		warn("vfork");
306 		if (optbuf)
307 			free(optbuf);
308 		free(argv);
309 		return FSCK_EXIT_CHECK_FAILED;
310 
311 	case 0:					/* Child. */
312 		if ((flags & CHECK_FORCE) == 0) {
313 			struct statvfs	sfs;
314 
315 				/*
316 				 * if mntpt is a mountpoint of a mounted file
317 				 * system and it's mounted read-write, skip it
318 				 * unless -f is given.
319 				 */
320 			if ((statvfs(mntpt, &sfs) == 0) &&
321 			    (strcmp(mntpt, sfs.f_mntonname) == 0) &&
322 			    ((sfs.f_flag & MNT_RDONLY) == 0)) {
323 				printf(
324 		"%s: file system is mounted read-write on %s; not checking\n",
325 				    spec, mntpt);
326 				if ((flags & CHECK_PREEN) && auxarg != NULL)
327 					_exit(FSCK_EXIT_OK);	/* fsck -p */
328 				else
329 					_exit(FSCK_EXIT_CHECK_FAILED);	/* fsck [[-p] ...] */
330 			}
331 		}
332 
333 		if (flags & CHECK_DEBUG)
334 			_exit(FSCK_EXIT_OK);
335 
336 		/* Go find an executable. */
337 		edir = edirs;
338 		do {
339 			(void)snprintf(execname,
340 			    sizeof(execname), "%s/%s", *edir, execbase);
341 			execv(execname, (char * const *)__UNCONST(argv));
342 			if (errno != ENOENT) {
343 				if (spec)
344 					warn("exec %s for %s", execname, spec);
345 				else
346 					warn("exec %s", execname);
347 			}
348 		} while (*++edir != NULL);
349 
350 		if (errno == ENOENT) {
351 			if (spec)
352 				warn("exec %s for %s", execname, spec);
353 			else
354 				warn("exec %s", execname);
355 		}
356 		_exit(FSCK_EXIT_CHECK_FAILED);
357 		/* NOTREACHED */
358 
359 	default:				/* Parent. */
360 		if (optbuf)
361 			free(optbuf);
362 		free(argv);
363 
364 		if (pidp) {
365 			*pidp = pid;
366 			return FSCK_EXIT_OK;
367 		}
368 
369 		if (waitpid(pid, &status, 0) < 0) {
370 			warn("waitpid");
371 			return FSCK_EXIT_CHECK_FAILED;
372 		}
373 
374 		if (WIFEXITED(status)) {
375 			if (WEXITSTATUS(status) != 0)
376 				return WEXITSTATUS(status);
377 		}
378 		else if (WIFSIGNALED(status)) {
379 			warnx("%s: %s", spec, strsignal(WTERMSIG(status)));
380 			return FSCK_EXIT_CHECK_FAILED;
381 		}
382 		break;
383 	}
384 
385 	return FSCK_EXIT_OK;
386 }
387 
388 
389 static int
390 selected(const char *type)
391 {
392 	struct entry *e;
393 
394 	/* If no type specified, it's always selected. */
395 	TAILQ_FOREACH(e, &selhead, entries)
396 		if (!strcmp(e->type, type))
397 			return which == IN_LIST ? 1 : 0;
398 
399 	return which == IN_LIST ? 0 : 1;
400 }
401 
402 
403 static int
404 omitted(const char *mountedon)
405 {
406 	struct entry *e;
407 
408 	/* If no type specified, it's always selected. */
409 	TAILQ_FOREACH(e, &omhead, entries)
410 		if (!strcmp(e->type, mountedon))
411 			return 1;
412 
413 	return 0;
414 }
415 
416 
417 static const char *
418 getoptions(const char *type)
419 {
420 	struct entry *e;
421 
422 	TAILQ_FOREACH(e, &opthead, entries)
423 		if (!strcmp(e->type, type))
424 			return e->options;
425 	return "";
426 }
427 
428 
429 static void
430 addoption(char *optstr)
431 {
432 	char *newoptions;
433 	struct entry *e;
434 
435 	if ((newoptions = strchr(optstr, ':')) == NULL)
436 		errx(1, "Invalid option string");
437 
438 	*newoptions++ = '\0';
439 
440 	TAILQ_FOREACH(e, &opthead, entries)
441 		if (!strcmp(e->type, optstr)) {
442 			catopt(&e->options, newoptions);
443 			return;
444 		}
445 	addentry(&opthead, optstr, newoptions);
446 }
447 
448 
449 static void
450 addentry(struct fstypelist *list, const char *type, const char *opts)
451 {
452 	struct entry *e;
453 
454 	e = emalloc(sizeof(struct entry));
455 	e->type = estrdup(type);
456 	e->options = estrdup(opts);
457 	TAILQ_INSERT_TAIL(list, e, entries);
458 }
459 
460 
461 static void
462 maketypelist(char *fslist)
463 {
464 	char *ptr;
465 
466 	if ((fslist == NULL) || (fslist[0] == '\0'))
467 		errx(1, "empty type list");
468 
469 	if (fslist[0] == 'n' && fslist[1] == 'o') {
470 		fslist += 2;
471 		which = NOT_IN_LIST;
472 	}
473 	else
474 		which = IN_LIST;
475 
476 	while ((ptr = strsep(&fslist, ",")) != NULL)
477 		addentry(&selhead, ptr, "");
478 
479 }
480 
481 
482 static void
483 catopt(char **sp, const char *o)
484 {
485 	char *s;
486 	size_t i, j;
487 
488 	s = *sp;
489 	if (s) {
490 		i = strlen(s);
491 		j = i + 1 + strlen(o) + 1;
492 		s = erealloc(s, j);
493 		(void)snprintf(s + i, j, ",%s", o);
494 	} else
495 		s = estrdup(o);
496 	*sp = s;
497 }
498 
499 
500 static void
501 mangle(char *opts, int *argcp, const char ** volatile *argvp, int *maxargcp)
502 {
503 	char *p, *s;
504 	int argc, maxargc;
505 	const char **argv;
506 
507 	argc = *argcp;
508 	argv = *argvp;
509 	maxargc = *maxargcp;
510 
511 	for (s = opts; (p = strsep(&s, ",")) != NULL;) {
512 		/* Always leave space for one more argument and the NULL. */
513 		if (argc >= maxargc - 3) {
514 			maxargc <<= 1;
515 			argv = erealloc(argv, maxargc * sizeof(char *));
516 		}
517 		if (*p != '\0')  {
518 			if (*p == '-') {
519 				argv[argc++] = p;
520 				p = strchr(p, '=');
521 				if (p) {
522 					*p = '\0';
523 					argv[argc++] = p+1;
524 				}
525 			} else {
526 				argv[argc++] = "-o";
527 				argv[argc++] = p;
528 			}
529 		}
530 	}
531 
532 	*argcp = argc;
533 	*argvp = argv;
534 	*maxargcp = maxargc;
535 }
536 
537 static const char *
538 getfslab(const char *str)
539 {
540 	static struct dkwedge_info dkw;
541 	struct disklabel dl;
542 	int fd;
543 	char p;
544 	const char *vfstype;
545 	u_char t;
546 
547 	/* deduce the file system type from the disk label */
548 	if ((fd = open(str, O_RDONLY)) == -1)
549 		err(1, "cannot open `%s'", str);
550 
551 	/* First check to see if it's a wedge. */
552 	if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) {
553 		/* Yup, this is easy. */
554 		(void) close(fd);
555 		return (dkw.dkw_ptype);
556 	}
557 
558 	if (ioctl(fd, DIOCGDINFO, &dl) == -1)
559 		err(1, "cannot get disklabel for `%s'", str);
560 
561 	(void) close(fd);
562 
563 	p = str[strlen(str) - 1];
564 
565 	if ((p - 'a') >= dl.d_npartitions)
566 		errx(1, "partition `%s' is not defined on disk", str);
567 
568 	if ((t = dl.d_partitions[p - 'a'].p_fstype) >= FSMAXTYPES)
569 		errx(1, "partition `%s' is not of a legal vfstype",
570 		    str);
571 
572 	if ((vfstype = fscknames[t]) == NULL)
573 		errx(1, "vfstype `%s' on partition `%s' is not supported",
574 		    fstypenames[t], str);
575 
576 	return vfstype;
577 }
578 
579 
580 static void
581 usage(void)
582 {
583 	static const char common[] =
584 	    "[-dfnPpqvy] [-x excludemount] [-l maxparallel] [-T fstype:fsoptions]\n\t\t[-t fstype]";
585 
586 	(void)fprintf(stderr, "usage: %s %s [special|node]...\n",
587 	    getprogname(), common);
588 	exit(FSCK_EXIT_USAGE);
589 }
590