xref: /freebsd/sbin/fsck_ffs/main.c (revision 4f1f4356f3012928b463f9ef1710fb908e48b1e2)
1 /*
2  * Copyright (c) 1980, 1986, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #if 0
31 #ifndef lint
32 static const char copyright[] =
33 "@(#) Copyright (c) 1980, 1986, 1993\n\
34 	The Regents of the University of California.  All rights reserved.\n";
35 #endif /* not lint */
36 
37 #ifndef lint
38 static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 5/14/95";
39 #endif /* not lint */
40 #endif
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43 
44 #include <sys/param.h>
45 #include <sys/stat.h>
46 #include <sys/file.h>
47 #include <sys/time.h>
48 #include <sys/mount.h>
49 #include <sys/resource.h>
50 #include <sys/sysctl.h>
51 #include <sys/uio.h>
52 #include <sys/disklabel.h>
53 
54 #include <ufs/ufs/dinode.h>
55 #include <ufs/ffs/fs.h>
56 
57 #include <err.h>
58 #include <errno.h>
59 #include <fstab.h>
60 #include <grp.h>
61 #include <mntopts.h>
62 #include <paths.h>
63 #include <stdint.h>
64 #include <string.h>
65 
66 #include "fsck.h"
67 
68 static void usage(void) __dead2;
69 static int argtoi(int flag, const char *req, const char *str, int base);
70 static int checkfilesys(char *filesys);
71 static int chkdoreload(struct statfs *mntp);
72 static struct statfs *getmntpt(const char *);
73 
74 int
75 main(int argc, char *argv[])
76 {
77 	int ch;
78 	struct rlimit rlimit;
79 	struct itimerval itimerval;
80 	int ret = 0;
81 
82 	sync();
83 	skipclean = 1;
84 	inoopt = 0;
85 	while ((ch = getopt(argc, argv, "b:Bc:CdfFm:npry")) != -1) {
86 		switch (ch) {
87 		case 'b':
88 			skipclean = 0;
89 			bflag = argtoi('b', "number", optarg, 10);
90 			printf("Alternate super block location: %d\n", bflag);
91 			break;
92 
93 		case 'B':
94 			bkgrdflag = 1;
95 			break;
96 
97 		case 'c':
98 			skipclean = 0;
99 			cvtlevel = argtoi('c', "conversion level", optarg, 10);
100 			if (cvtlevel < 3)
101 				errx(EEXIT, "cannot do level %d conversion",
102 				    cvtlevel);
103 			break;
104 
105 		case 'd':
106 			debug++;
107 			break;
108 
109 		case 'f':
110 			skipclean = 0;
111 			break;
112 
113 		case 'F':
114 			bkgrdcheck = 1;
115 			break;
116 
117 		case 'm':
118 			lfmode = argtoi('m', "mode", optarg, 8);
119 			if (lfmode &~ 07777)
120 				errx(EEXIT, "bad mode to -m: %o", lfmode);
121 			printf("** lost+found creation mode %o\n", lfmode);
122 			break;
123 
124 		case 'n':
125 			nflag++;
126 			yflag = 0;
127 			break;
128 
129 		case 'p':
130 			preen++;
131 			/*FALLTHROUGH*/
132 
133 		case 'C':
134 			ckclean++;
135 			break;
136 
137 		case 'r':
138 			inoopt++;
139 			break;
140 
141 		case 'y':
142 			yflag++;
143 			nflag = 0;
144 			break;
145 
146 		default:
147 			usage();
148 		}
149 	}
150 	argc -= optind;
151 	argv += optind;
152 
153 	if (!argc)
154 		usage();
155 
156 	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
157 		(void)signal(SIGINT, catch);
158 	if (ckclean)
159 		(void)signal(SIGQUIT, catchquit);
160 	signal(SIGINFO, infohandler);
161 	if (bkgrdflag) {
162 		signal(SIGALRM, alarmhandler);
163 		itimerval.it_interval.tv_sec = 5;
164 		itimerval.it_interval.tv_usec = 0;
165 		itimerval.it_value.tv_sec = 5;
166 		itimerval.it_value.tv_usec = 0;
167 		setitimer(ITIMER_REAL, &itimerval, NULL);
168 	}
169 	/*
170 	 * Push up our allowed memory limit so we can cope
171 	 * with huge file systems.
172 	 */
173 	if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
174 		rlimit.rlim_cur = rlimit.rlim_max;
175 		(void)setrlimit(RLIMIT_DATA, &rlimit);
176 	}
177 	while (argc-- > 0)
178 		(void)checkfilesys(*argv++);
179 
180 	if (returntosingle)
181 		ret = 2;
182 	exit(ret);
183 }
184 
185 static int
186 argtoi(int flag, const char *req, const char *str, int base)
187 {
188 	char *cp;
189 	int ret;
190 
191 	ret = (int)strtol(str, &cp, base);
192 	if (cp == str || *cp)
193 		errx(EEXIT, "-%c flag requires a %s", flag, req);
194 	return (ret);
195 }
196 
197 /*
198  * Check the specified file system.
199  */
200 /* ARGSUSED */
201 static int
202 checkfilesys(char *filesys)
203 {
204 	ufs2_daddr_t n_ffree, n_bfree;
205 	struct dups *dp;
206 	struct statfs *mntp;
207 	struct stat snapdir;
208 	struct group *grp;
209 	ufs2_daddr_t blks;
210 	struct iovec *iov;
211 	char errmsg[255];
212 	int iovlen;
213 	int cylno;
214 	ino_t files;
215 	size_t size;
216 
217 	iov = NULL;
218 	iovlen = 0;
219 	errmsg[0] = '\0';
220 
221 	cdevname = filesys;
222 	if (debug && ckclean)
223 		pwarn("starting\n");
224 	/*
225 	 * Make best effort to get the disk name. Check first to see
226 	 * if it is listed among the mounted file systems. Failing that
227 	 * check to see if it is listed in /etc/fstab.
228 	 */
229 	mntp = getmntpt(filesys);
230 	if (mntp != NULL)
231 		filesys = mntp->f_mntfromname;
232 	else
233 		filesys = blockcheck(filesys);
234 	/*
235 	 * If -F flag specified, check to see whether a background check
236 	 * is possible and needed. If possible and needed, exit with
237 	 * status zero. Otherwise exit with status non-zero. A non-zero
238 	 * exit status will cause a foreground check to be run.
239 	 */
240 	sblock_init();
241 	if (bkgrdcheck) {
242 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
243 			exit(3);	/* Cannot read superblock */
244 		close(fsreadfd);
245 		/* Earlier background failed or journaled */
246 		if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
247 			exit(4);
248 		if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
249 			exit(5);	/* Not running soft updates */
250 		size = MIBSIZE;
251 		if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
252 			exit(6);	/* Lacks kernel support */
253 		if ((mntp == NULL && sblock.fs_clean == 1) ||
254 		    (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
255 			exit(7);	/* Filesystem clean, report it now */
256 		exit(0);
257 	}
258 	if (ckclean && skipclean) {
259 		/*
260 		 * If file system is gjournaled, check it here.
261 		 */
262 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
263 			exit(3);	/* Cannot read superblock */
264 		close(fsreadfd);
265 		if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
266 			//printf("GJournaled file system detected on %s.\n",
267 			//    filesys);
268 			if (sblock.fs_clean == 1) {
269 				pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
270 				exit(0);
271 			}
272 			if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
273 				gjournal_check(filesys);
274 				if (chkdoreload(mntp) == 0)
275 					exit(0);
276 				exit(4);
277 			} else {
278 				pfatal("UNEXPECTED INCONSISTENCY, %s\n",
279 				    "CANNOT RUN FAST FSCK\n");
280 			}
281 		}
282 	}
283 	/*
284 	 * If we are to do a background check:
285 	 *	Get the mount point information of the file system
286 	 *	create snapshot file
287 	 *	return created snapshot file
288 	 *	if not found, clear bkgrdflag and proceed with normal fsck
289 	 */
290 	if (bkgrdflag) {
291 		if (mntp == NULL) {
292 			bkgrdflag = 0;
293 			pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
294 		} else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
295 			bkgrdflag = 0;
296 			pfatal("NOT USING SOFT UPDATES, %s\n",
297 			    "CANNOT RUN IN BACKGROUND");
298 		} else if ((mntp->f_flags & MNT_RDONLY) != 0) {
299 			bkgrdflag = 0;
300 			pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
301 		} else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
302 			if (readsb(0) != 0) {
303 				if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
304 					bkgrdflag = 0;
305 					pfatal("UNEXPECTED INCONSISTENCY, %s\n",
306 					    "CANNOT RUN IN BACKGROUND\n");
307 				}
308 				if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
309 				    skipclean && ckclean) {
310 					/*
311 					 * file system is clean;
312 					 * skip snapshot and report it clean
313 					 */
314 					pwarn("FILE SYSTEM CLEAN; %s\n",
315 					    "SKIPPING CHECKS");
316 					goto clean;
317 				}
318 			}
319 			close(fsreadfd);
320 		}
321 		if (bkgrdflag) {
322 			snprintf(snapname, sizeof snapname, "%s/.snap",
323 			    mntp->f_mntonname);
324 			if (stat(snapname, &snapdir) < 0) {
325 				if (errno != ENOENT) {
326 					bkgrdflag = 0;
327 					pfatal("CANNOT FIND %s %s: %s, %s\n",
328 					    "SNAPSHOT DIRECTORY",
329 					    snapname, strerror(errno),
330 					    "CANNOT RUN IN BACKGROUND");
331 				} else if ((grp = getgrnam("operator")) == 0 ||
332 				    mkdir(snapname, 0770) < 0 ||
333 				    chown(snapname, -1, grp->gr_gid) < 0 ||
334 				    chmod(snapname, 0770) < 0) {
335 					bkgrdflag = 0;
336 					pfatal("CANNOT CREATE %s %s: %s, %s\n",
337 					    "SNAPSHOT DIRECTORY",
338 					    snapname, strerror(errno),
339 					    "CANNOT RUN IN BACKGROUND");
340 				}
341 			} else if (!S_ISDIR(snapdir.st_mode)) {
342 				bkgrdflag = 0;
343 				pfatal("%s IS NOT A DIRECTORY, %s\n", snapname,
344 				    "CANNOT RUN IN BACKGROUND");
345 			}
346 		}
347 		if (bkgrdflag) {
348 			snprintf(snapname, sizeof snapname,
349 			    "%s/.snap/fsck_snapshot", mntp->f_mntonname);
350 			build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
351 			build_iovec(&iov, &iovlen, "from", snapname,
352 			    (size_t)-1);
353 			build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
354 			    (size_t)-1);
355 			build_iovec(&iov, &iovlen, "errmsg", errmsg,
356 			    sizeof(errmsg));
357 			build_iovec(&iov, &iovlen, "update", NULL, 0);
358 			build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
359 
360 			while (nmount(iov, iovlen, mntp->f_flags) < 0) {
361 				if (errno == EEXIST && unlink(snapname) == 0)
362 					continue;
363 				bkgrdflag = 0;
364 				pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
365 				    snapname, strerror(errno), errmsg);
366 				break;
367 			}
368 			if (bkgrdflag != 0)
369 				filesys = snapname;
370 		}
371 	}
372 
373 	switch (setup(filesys)) {
374 	case 0:
375 		if (preen)
376 			pfatal("CAN'T CHECK FILE SYSTEM.");
377 		return (0);
378 	case -1:
379 	clean:
380 		pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
381 		    sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
382 		printf("(%lld frags, %lld blocks, %.1f%% fragmentation)\n",
383 		    (long long)sblock.fs_cstotal.cs_nffree,
384 		    (long long)sblock.fs_cstotal.cs_nbfree,
385 		    sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
386 		return (0);
387 	}
388 	/*
389 	 * Determine if we can and should do journal recovery.
390 	 */
391 	if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
392 		if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
393 			if (preen || reply("USE JOURNAL")) {
394 				if (suj_check(filesys) == 0) {
395 					printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
396 					if (chkdoreload(mntp) == 0)
397 						exit(0);
398 					exit(4);
399 				}
400 			}
401 			printf("** Skipping journal, falling through to full fsck\n\n");
402 		}
403 		/*
404 		 * Write the superblock so we don't try to recover the
405 		 * journal on another pass.
406 		 */
407 		sblock.fs_mtime = time(NULL);
408 		sbdirty();
409 	}
410 
411 	/*
412 	 * Cleared if any questions answered no. Used to decide if
413 	 * the superblock should be marked clean.
414 	 */
415 	resolved = 1;
416 	/*
417 	 * 1: scan inodes tallying blocks used
418 	 */
419 	if (preen == 0) {
420 		printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
421 		if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
422 			printf("** Root file system\n");
423 		printf("** Phase 1 - Check Blocks and Sizes\n");
424 	}
425 	pass1();
426 
427 	/*
428 	 * 1b: locate first references to duplicates, if any
429 	 */
430 	if (duplist) {
431 		if (preen || usedsoftdep)
432 			pfatal("INTERNAL ERROR: dups with %s%s%s",
433 			    preen ? "-p" : "",
434 			    (preen && usedsoftdep) ? " and " : "",
435 			    usedsoftdep ? "softupdates" : "");
436 		printf("** Phase 1b - Rescan For More DUPS\n");
437 		pass1b();
438 	}
439 
440 	/*
441 	 * 2: traverse directories from root to mark all connected directories
442 	 */
443 	if (preen == 0)
444 		printf("** Phase 2 - Check Pathnames\n");
445 	pass2();
446 
447 	/*
448 	 * 3: scan inodes looking for disconnected directories
449 	 */
450 	if (preen == 0)
451 		printf("** Phase 3 - Check Connectivity\n");
452 	pass3();
453 
454 	/*
455 	 * 4: scan inodes looking for disconnected files; check reference counts
456 	 */
457 	if (preen == 0)
458 		printf("** Phase 4 - Check Reference Counts\n");
459 	pass4();
460 
461 	/*
462 	 * 5: check and repair resource counts in cylinder groups
463 	 */
464 	if (preen == 0)
465 		printf("** Phase 5 - Check Cyl groups\n");
466 	pass5();
467 
468 	/*
469 	 * print out summary statistics
470 	 */
471 	n_ffree = sblock.fs_cstotal.cs_nffree;
472 	n_bfree = sblock.fs_cstotal.cs_nbfree;
473 	files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
474 	blks = n_blks +
475 	    sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
476 	blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
477 	blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
478 	blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
479 	if (bkgrdflag && (files > 0 || blks > 0)) {
480 		countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
481 		pwarn("Reclaimed: %ld directories, %ld files, %lld fragments\n",
482 		    countdirs, (long)files - countdirs, (long long)blks);
483 	}
484 	pwarn("%ld files, %jd used, %ju free ",
485 	    (long)n_files, (intmax_t)n_blks,
486 	    (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
487 	printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
488 	    (uintmax_t)n_ffree, (uintmax_t)n_bfree,
489 	    n_ffree * 100.0 / sblock.fs_dsize);
490 	if (debug) {
491 		if (files < 0)
492 			printf("%d inodes missing\n", -files);
493 		if (blks < 0)
494 			printf("%lld blocks missing\n", -(long long)blks);
495 		if (duplist != NULL) {
496 			printf("The following duplicate blocks remain:");
497 			for (dp = duplist; dp; dp = dp->next)
498 				printf(" %lld,", (long long)dp->dup);
499 			printf("\n");
500 		}
501 	}
502 	duplist = (struct dups *)0;
503 	muldup = (struct dups *)0;
504 	inocleanup();
505 	if (fsmodified) {
506 		sblock.fs_time = time(NULL);
507 		sbdirty();
508 	}
509 	if (cvtlevel && sblk.b_dirty) {
510 		/*
511 		 * Write out the duplicate super blocks
512 		 */
513 		for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
514 			blwrite(fswritefd, (char *)&sblock,
515 			    fsbtodb(&sblock, cgsblock(&sblock, cylno)),
516 			    SBLOCKSIZE);
517 	}
518 	if (rerun)
519 		resolved = 0;
520 
521 	/*
522 	 * Check to see if the file system is mounted read-write.
523 	 */
524 	if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
525 		resolved = 0;
526 	ckfini(resolved);
527 
528 	for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
529 		if (inostathead[cylno].il_stat != NULL)
530 			free((char *)inostathead[cylno].il_stat);
531 	free((char *)inostathead);
532 	inostathead = NULL;
533 	if (fsmodified && !preen)
534 		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
535 	if (rerun)
536 		printf("\n***** PLEASE RERUN FSCK *****\n");
537 	if (chkdoreload(mntp) != 0) {
538 		if (!fsmodified)
539 			return (0);
540 		if (!preen)
541 			printf("\n***** REBOOT NOW *****\n");
542 		sync();
543 		return (4);
544 	}
545 	return (0);
546 }
547 
548 static int
549 chkdoreload(struct statfs *mntp)
550 {
551 	struct iovec *iov;
552 	int iovlen;
553 	char errmsg[255];
554 
555 	if (mntp == NULL)
556 		return (0);
557 
558 	iov = NULL;
559 	iovlen = 0;
560 	errmsg[0] = '\0';
561 	/*
562 	 * We modified a mounted file system.  Do a mount update on
563 	 * it unless it is read-write, so we can continue using it
564 	 * as safely as possible.
565 	 */
566 	if (mntp->f_flags & MNT_RDONLY) {
567 		build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
568 		build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
569 		    (size_t)-1);
570 		build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
571 		    (size_t)-1);
572 		build_iovec(&iov, &iovlen, "errmsg", errmsg,
573 		    sizeof(errmsg));
574 		build_iovec(&iov, &iovlen, "update", NULL, 0);
575 		build_iovec(&iov, &iovlen, "reload", NULL, 0);
576 		/*
577 		 * XX: We need the following line until we clean up
578 		 * nmount parsing of root mounts and NFS root mounts.
579 		 */
580 		build_iovec(&iov, &iovlen, "ro", NULL, 0);
581 		if (nmount(iov, iovlen, mntp->f_flags) == 0) {
582 			return (0);
583 		}
584 		pwarn("mount reload of '%s' failed: %s %s\n\n",
585 		    mntp->f_mntonname, strerror(errno), errmsg);
586 		return (1);
587 	}
588 	return (0);
589 }
590 
591 /*
592  * Get the mount point information for name.
593  */
594 static struct statfs *
595 getmntpt(const char *name)
596 {
597 	struct stat devstat, mntdevstat;
598 	char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
599 	char *ddevname;
600 	struct statfs *mntbuf, *statfsp;
601 	int i, mntsize, isdev;
602 
603 	if (stat(name, &devstat) != 0)
604 		return (NULL);
605 	if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
606 		isdev = 1;
607 	else
608 		isdev = 0;
609 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
610 	for (i = 0; i < mntsize; i++) {
611 		statfsp = &mntbuf[i];
612 		ddevname = statfsp->f_mntfromname;
613 		if (*ddevname != '/') {
614 			strcpy(device, _PATH_DEV);
615 			strcat(device, ddevname);
616 			strcpy(statfsp->f_mntfromname, device);
617 		}
618 		if (isdev == 0) {
619 			if (strcmp(name, statfsp->f_mntonname))
620 				continue;
621 			return (statfsp);
622 		}
623 		if (stat(ddevname, &mntdevstat) == 0 &&
624 		    mntdevstat.st_rdev == devstat.st_rdev)
625 			return (statfsp);
626 	}
627 	statfsp = NULL;
628 	return (statfsp);
629 }
630 
631 static void
632 usage(void)
633 {
634         (void) fprintf(stderr,
635             "usage: %s [-BFprfny] [-b block] [-c level] [-m mode] "
636                         "filesystem ...\n",
637             getprogname());
638         exit(1);
639 }
640