xref: /freebsd/sbin/fsck_ffs/main.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
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/file.h>
46 #include <sys/mount.h>
47 #include <sys/resource.h>
48 #include <sys/stat.h>
49 #include <sys/sysctl.h>
50 #include <sys/uio.h>
51 #include <sys/disklabel.h>
52 
53 #include <ufs/ufs/dinode.h>
54 #include <ufs/ffs/fs.h>
55 
56 #include <err.h>
57 #include <errno.h>
58 #include <fstab.h>
59 #include <grp.h>
60 #include <mntopts.h>
61 #include <paths.h>
62 #include <stdint.h>
63 #include <string.h>
64 #include <time.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:CdEfFm:nprSyZ")) != -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 'E':
110 			Eflag++;
111 			break;
112 
113 		case 'f':
114 			skipclean = 0;
115 			break;
116 
117 		case 'F':
118 			bkgrdcheck = 1;
119 			break;
120 
121 		case 'm':
122 			lfmode = argtoi('m', "mode", optarg, 8);
123 			if (lfmode &~ 07777)
124 				errx(EEXIT, "bad mode to -m: %o", lfmode);
125 			printf("** lost+found creation mode %o\n", lfmode);
126 			break;
127 
128 		case 'n':
129 			nflag++;
130 			yflag = 0;
131 			break;
132 
133 		case 'p':
134 			preen++;
135 			/*FALLTHROUGH*/
136 
137 		case 'C':
138 			ckclean++;
139 			break;
140 
141 		case 'r':
142 			inoopt++;
143 			break;
144 
145 		case 'S':
146 			surrender = 1;
147 			break;
148 
149 		case 'y':
150 			yflag++;
151 			nflag = 0;
152 			break;
153 
154 		case 'Z':
155 			Zflag++;
156 			break;
157 
158 		default:
159 			usage();
160 		}
161 	}
162 	argc -= optind;
163 	argv += optind;
164 
165 	if (!argc)
166 		usage();
167 
168 	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
169 		(void)signal(SIGINT, catch);
170 	if (ckclean)
171 		(void)signal(SIGQUIT, catchquit);
172 	signal(SIGINFO, infohandler);
173 	if (bkgrdflag) {
174 		signal(SIGALRM, alarmhandler);
175 		itimerval.it_interval.tv_sec = 5;
176 		itimerval.it_interval.tv_usec = 0;
177 		itimerval.it_value.tv_sec = 5;
178 		itimerval.it_value.tv_usec = 0;
179 		setitimer(ITIMER_REAL, &itimerval, NULL);
180 	}
181 	/*
182 	 * Push up our allowed memory limit so we can cope
183 	 * with huge file systems.
184 	 */
185 	if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
186 		rlimit.rlim_cur = rlimit.rlim_max;
187 		(void)setrlimit(RLIMIT_DATA, &rlimit);
188 	}
189 	while (argc-- > 0)
190 		(void)checkfilesys(*argv++);
191 
192 	if (returntosingle)
193 		ret = 2;
194 	exit(ret);
195 }
196 
197 static int
198 argtoi(int flag, const char *req, const char *str, int base)
199 {
200 	char *cp;
201 	int ret;
202 
203 	ret = (int)strtol(str, &cp, base);
204 	if (cp == str || *cp)
205 		errx(EEXIT, "-%c flag requires a %s", flag, req);
206 	return (ret);
207 }
208 
209 /*
210  * Check the specified file system.
211  */
212 /* ARGSUSED */
213 static int
214 checkfilesys(char *filesys)
215 {
216 	ufs2_daddr_t n_ffree, n_bfree;
217 	struct dups *dp;
218 	struct statfs *mntp;
219 	struct stat snapdir;
220 	struct group *grp;
221 	struct iovec *iov;
222 	char errmsg[255];
223 	int iovlen;
224 	int cylno;
225 	intmax_t blks, files;
226 	size_t size;
227 
228 	iov = NULL;
229 	iovlen = 0;
230 	errmsg[0] = '\0';
231 
232 	cdevname = filesys;
233 	if (debug && ckclean)
234 		pwarn("starting\n");
235 	/*
236 	 * Make best effort to get the disk name. Check first to see
237 	 * if it is listed among the mounted file systems. Failing that
238 	 * check to see if it is listed in /etc/fstab.
239 	 */
240 	mntp = getmntpt(filesys);
241 	if (mntp != NULL)
242 		filesys = mntp->f_mntfromname;
243 	else
244 		filesys = blockcheck(filesys);
245 	/*
246 	 * If -F flag specified, check to see whether a background check
247 	 * is possible and needed. If possible and needed, exit with
248 	 * status zero. Otherwise exit with status non-zero. A non-zero
249 	 * exit status will cause a foreground check to be run.
250 	 */
251 	sblock_init();
252 	if (bkgrdcheck) {
253 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
254 			exit(3);	/* Cannot read superblock */
255 		close(fsreadfd);
256 		/* Earlier background failed or journaled */
257 		if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
258 			exit(4);
259 		if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
260 			exit(5);	/* Not running soft updates */
261 		size = MIBSIZE;
262 		if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
263 			exit(6);	/* Lacks kernel support */
264 		if ((mntp == NULL && sblock.fs_clean == 1) ||
265 		    (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
266 			exit(7);	/* Filesystem clean, report it now */
267 		exit(0);
268 	}
269 	if (ckclean && skipclean) {
270 		/*
271 		 * If file system is gjournaled, check it here.
272 		 */
273 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
274 			exit(3);	/* Cannot read superblock */
275 		close(fsreadfd);
276 		if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
277 			//printf("GJournaled file system detected on %s.\n",
278 			//    filesys);
279 			if (sblock.fs_clean == 1) {
280 				pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
281 				exit(0);
282 			}
283 			if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
284 				gjournal_check(filesys);
285 				if (chkdoreload(mntp) == 0)
286 					exit(0);
287 				exit(4);
288 			} else {
289 				pfatal(
290 			    "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
291 			}
292 		}
293 	}
294 	/*
295 	 * If we are to do a background check:
296 	 *	Get the mount point information of the file system
297 	 *	create snapshot file
298 	 *	return created snapshot file
299 	 *	if not found, clear bkgrdflag and proceed with normal fsck
300 	 */
301 	if (bkgrdflag) {
302 		if (mntp == NULL) {
303 			bkgrdflag = 0;
304 			pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
305 		} else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
306 			bkgrdflag = 0;
307 			pfatal(
308 			  "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
309 		} else if ((mntp->f_flags & MNT_RDONLY) != 0) {
310 			bkgrdflag = 0;
311 			pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
312 		} else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
313 			if (readsb(0) != 0) {
314 				if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
315 					bkgrdflag = 0;
316 					pfatal(
317 			"UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
318 				}
319 				if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
320 				    skipclean && ckclean) {
321 					/*
322 					 * file system is clean;
323 					 * skip snapshot and report it clean
324 					 */
325 					pwarn(
326 					"FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
327 					goto clean;
328 				}
329 			}
330 			close(fsreadfd);
331 		}
332 		if (bkgrdflag) {
333 			snprintf(snapname, sizeof snapname, "%s/.snap",
334 			    mntp->f_mntonname);
335 			if (stat(snapname, &snapdir) < 0) {
336 				if (errno != ENOENT) {
337 					bkgrdflag = 0;
338 					pfatal(
339 	"CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
340 					    snapname, strerror(errno));
341 				} else if ((grp = getgrnam("operator")) == 0 ||
342 				    mkdir(snapname, 0770) < 0 ||
343 				    chown(snapname, -1, grp->gr_gid) < 0 ||
344 				    chmod(snapname, 0770) < 0) {
345 					bkgrdflag = 0;
346 					pfatal(
347 	"CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
348 					    snapname, strerror(errno));
349 				}
350 			} else if (!S_ISDIR(snapdir.st_mode)) {
351 				bkgrdflag = 0;
352 				pfatal(
353 			"%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
354 				    snapname);
355 			}
356 		}
357 		if (bkgrdflag) {
358 			snprintf(snapname, sizeof snapname,
359 			    "%s/.snap/fsck_snapshot", mntp->f_mntonname);
360 			build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
361 			build_iovec(&iov, &iovlen, "from", snapname,
362 			    (size_t)-1);
363 			build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
364 			    (size_t)-1);
365 			build_iovec(&iov, &iovlen, "errmsg", errmsg,
366 			    sizeof(errmsg));
367 			build_iovec(&iov, &iovlen, "update", NULL, 0);
368 			build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
369 
370 			while (nmount(iov, iovlen, mntp->f_flags) < 0) {
371 				if (errno == EEXIST && unlink(snapname) == 0)
372 					continue;
373 				bkgrdflag = 0;
374 				pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
375 				    snapname, strerror(errno), errmsg);
376 				break;
377 			}
378 			if (bkgrdflag != 0)
379 				filesys = snapname;
380 		}
381 	}
382 
383 	switch (setup(filesys)) {
384 	case 0:
385 		if (preen)
386 			pfatal("CAN'T CHECK FILE SYSTEM.");
387 		return (0);
388 	case -1:
389 	clean:
390 		pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
391 		    sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
392 		printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
393 		    (intmax_t)sblock.fs_cstotal.cs_nffree,
394 		    (intmax_t)sblock.fs_cstotal.cs_nbfree,
395 		    sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
396 		return (0);
397 	}
398 	/*
399 	 * Determine if we can and should do journal recovery.
400 	 */
401 	if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
402 		if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
403 			if (preen || reply("USE JOURNAL")) {
404 				if (suj_check(filesys) == 0) {
405 					printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
406 					if (chkdoreload(mntp) == 0)
407 						exit(0);
408 					exit(4);
409 				}
410 			}
411 			printf("** Skipping journal, falling through to full fsck\n\n");
412 		}
413 		/*
414 		 * Write the superblock so we don't try to recover the
415 		 * journal on another pass.
416 		 */
417 		sblock.fs_mtime = time(NULL);
418 		sbdirty();
419 	}
420 
421 	/*
422 	 * Cleared if any questions answered no. Used to decide if
423 	 * the superblock should be marked clean.
424 	 */
425 	resolved = 1;
426 	/*
427 	 * 1: scan inodes tallying blocks used
428 	 */
429 	if (preen == 0) {
430 		printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
431 		if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
432 			printf("** Root file system\n");
433 		printf("** Phase 1 - Check Blocks and Sizes\n");
434 	}
435 	clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
436 	pass1();
437 	IOstats("Pass1");
438 
439 	/*
440 	 * 1b: locate first references to duplicates, if any
441 	 */
442 	if (duplist) {
443 		if (preen || usedsoftdep)
444 			pfatal("INTERNAL ERROR: dups with %s%s%s",
445 			    preen ? "-p" : "",
446 			    (preen && usedsoftdep) ? " and " : "",
447 			    usedsoftdep ? "softupdates" : "");
448 		printf("** Phase 1b - Rescan For More DUPS\n");
449 		pass1b();
450 		IOstats("Pass1b");
451 	}
452 
453 	/*
454 	 * 2: traverse directories from root to mark all connected directories
455 	 */
456 	if (preen == 0)
457 		printf("** Phase 2 - Check Pathnames\n");
458 	pass2();
459 	IOstats("Pass2");
460 
461 	/*
462 	 * 3: scan inodes looking for disconnected directories
463 	 */
464 	if (preen == 0)
465 		printf("** Phase 3 - Check Connectivity\n");
466 	pass3();
467 	IOstats("Pass3");
468 
469 	/*
470 	 * 4: scan inodes looking for disconnected files; check reference counts
471 	 */
472 	if (preen == 0)
473 		printf("** Phase 4 - Check Reference Counts\n");
474 	pass4();
475 	IOstats("Pass4");
476 
477 	/*
478 	 * 5: check and repair resource counts in cylinder groups
479 	 */
480 	if (preen == 0)
481 		printf("** Phase 5 - Check Cyl groups\n");
482 	pass5();
483 	IOstats("Pass5");
484 
485 	/*
486 	 * print out summary statistics
487 	 */
488 	n_ffree = sblock.fs_cstotal.cs_nffree;
489 	n_bfree = sblock.fs_cstotal.cs_nbfree;
490 	files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
491 	blks = n_blks +
492 	    sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
493 	blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
494 	blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
495 	blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
496 	if (bkgrdflag && (files > 0 || blks > 0)) {
497 		countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
498 		pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
499 		    countdirs, files - countdirs, blks);
500 	}
501 	pwarn("%ld files, %jd used, %ju free ",
502 	    (long)n_files, (intmax_t)n_blks,
503 	    (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
504 	printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
505 	    (uintmax_t)n_ffree, (uintmax_t)n_bfree,
506 	    n_ffree * 100.0 / sblock.fs_dsize);
507 	if (debug) {
508 		if (files < 0)
509 			printf("%jd inodes missing\n", -files);
510 		if (blks < 0)
511 			printf("%jd blocks missing\n", -blks);
512 		if (duplist != NULL) {
513 			printf("The following duplicate blocks remain:");
514 			for (dp = duplist; dp; dp = dp->next)
515 				printf(" %jd,", (intmax_t)dp->dup);
516 			printf("\n");
517 		}
518 	}
519 	duplist = (struct dups *)0;
520 	muldup = (struct dups *)0;
521 	inocleanup();
522 	if (fsmodified) {
523 		sblock.fs_time = time(NULL);
524 		sbdirty();
525 	}
526 	if (cvtlevel && sblk.b_dirty) {
527 		/*
528 		 * Write out the duplicate super blocks
529 		 */
530 		for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
531 			blwrite(fswritefd, (char *)&sblock,
532 			    fsbtodb(&sblock, cgsblock(&sblock, cylno)),
533 			    SBLOCKSIZE);
534 	}
535 	if (rerun)
536 		resolved = 0;
537 	finalIOstats();
538 
539 	/*
540 	 * Check to see if the file system is mounted read-write.
541 	 */
542 	if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
543 		resolved = 0;
544 	ckfini(resolved);
545 
546 	for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
547 		if (inostathead[cylno].il_stat != NULL)
548 			free((char *)inostathead[cylno].il_stat);
549 	free((char *)inostathead);
550 	inostathead = NULL;
551 	if (fsmodified && !preen)
552 		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
553 	if (rerun)
554 		printf("\n***** PLEASE RERUN FSCK *****\n");
555 	if (chkdoreload(mntp) != 0) {
556 		if (!fsmodified)
557 			return (0);
558 		if (!preen)
559 			printf("\n***** REBOOT NOW *****\n");
560 		sync();
561 		return (4);
562 	}
563 	return (0);
564 }
565 
566 static int
567 chkdoreload(struct statfs *mntp)
568 {
569 	struct iovec *iov;
570 	int iovlen;
571 	char errmsg[255];
572 
573 	if (mntp == NULL)
574 		return (0);
575 
576 	iov = NULL;
577 	iovlen = 0;
578 	errmsg[0] = '\0';
579 	/*
580 	 * We modified a mounted file system.  Do a mount update on
581 	 * it unless it is read-write, so we can continue using it
582 	 * as safely as possible.
583 	 */
584 	if (mntp->f_flags & MNT_RDONLY) {
585 		build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
586 		build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
587 		    (size_t)-1);
588 		build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
589 		    (size_t)-1);
590 		build_iovec(&iov, &iovlen, "errmsg", errmsg,
591 		    sizeof(errmsg));
592 		build_iovec(&iov, &iovlen, "update", NULL, 0);
593 		build_iovec(&iov, &iovlen, "reload", NULL, 0);
594 		/*
595 		 * XX: We need the following line until we clean up
596 		 * nmount parsing of root mounts and NFS root mounts.
597 		 */
598 		build_iovec(&iov, &iovlen, "ro", NULL, 0);
599 		if (nmount(iov, iovlen, mntp->f_flags) == 0) {
600 			return (0);
601 		}
602 		pwarn("mount reload of '%s' failed: %s %s\n\n",
603 		    mntp->f_mntonname, strerror(errno), errmsg);
604 		return (1);
605 	}
606 	return (0);
607 }
608 
609 /*
610  * Get the mount point information for name.
611  */
612 static struct statfs *
613 getmntpt(const char *name)
614 {
615 	struct stat devstat, mntdevstat;
616 	char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
617 	char *ddevname;
618 	struct statfs *mntbuf, *statfsp;
619 	int i, mntsize, isdev;
620 
621 	if (stat(name, &devstat) != 0)
622 		return (NULL);
623 	if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
624 		isdev = 1;
625 	else
626 		isdev = 0;
627 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
628 	for (i = 0; i < mntsize; i++) {
629 		statfsp = &mntbuf[i];
630 		ddevname = statfsp->f_mntfromname;
631 		if (*ddevname != '/') {
632 			strcpy(device, _PATH_DEV);
633 			strcat(device, ddevname);
634 			strcpy(statfsp->f_mntfromname, device);
635 		}
636 		if (isdev == 0) {
637 			if (strcmp(name, statfsp->f_mntonname))
638 				continue;
639 			return (statfsp);
640 		}
641 		if (stat(ddevname, &mntdevstat) == 0 &&
642 		    mntdevstat.st_rdev == devstat.st_rdev)
643 			return (statfsp);
644 	}
645 	statfsp = NULL;
646 	return (statfsp);
647 }
648 
649 static void
650 usage(void)
651 {
652 	(void) fprintf(stderr,
653 "usage: %s [-BEFfnpry] [-b block] [-c level] [-m mode] filesystem ...\n",
654 	    getprogname());
655 	exit(1);
656 }
657