xref: /freebsd/sbin/fsck_ffs/main.c (revision ed1a156b038dee0e7a02c2935186ad5d8f4c36c1)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1980, 1986, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #if 0
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1980, 1986, 1993\n\
36 	The Regents of the University of California.  All rights reserved.\n";
37 #endif /* not lint */
38 
39 #ifndef lint
40 static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 5/14/95";
41 #endif /* not lint */
42 #endif
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45 
46 #define	IN_RTLD			/* So we pickup the P_OSREL defines */
47 #include <sys/param.h>
48 #include <sys/file.h>
49 #include <sys/mount.h>
50 #include <sys/resource.h>
51 #include <sys/stat.h>
52 #include <sys/sysctl.h>
53 #include <sys/uio.h>
54 #include <sys/disklabel.h>
55 
56 #include <ufs/ufs/dinode.h>
57 #include <ufs/ffs/fs.h>
58 
59 #include <err.h>
60 #include <errno.h>
61 #include <fstab.h>
62 #include <grp.h>
63 #include <inttypes.h>
64 #include <libufs.h>
65 #include <mntopts.h>
66 #include <paths.h>
67 #include <stdint.h>
68 #include <string.h>
69 #include <time.h>
70 
71 #include "fsck.h"
72 
73 static int	restarts;
74 
75 static void usage(void) __dead2;
76 static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
77 static int checkfilesys(char *filesys);
78 static int chkdoreload(struct statfs *mntp);
79 static struct statfs *getmntpt(const char *);
80 
81 int
82 main(int argc, char *argv[])
83 {
84 	int ch;
85 	struct rlimit rlimit;
86 	struct itimerval itimerval;
87 	int fsret;
88 	int ret = 0;
89 
90 	sync();
91 	skipclean = 1;
92 	inoopt = 0;
93 	while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) {
94 		switch (ch) {
95 		case 'b':
96 			skipclean = 0;
97 			bflag = argtoimax('b', "number", optarg, 10);
98 			printf("Alternate super block location: %jd\n", bflag);
99 			break;
100 
101 		case 'B':
102 			bkgrdflag = 1;
103 			break;
104 
105 		case 'c':
106 			skipclean = 0;
107 			cvtlevel = argtoimax('c', "conversion level", optarg,
108 			    10);
109 			if (cvtlevel < 3)
110 				errx(EEXIT, "cannot do level %d conversion",
111 				    cvtlevel);
112 			break;
113 
114 		case 'd':
115 			debug++;
116 			break;
117 
118 		case 'E':
119 			Eflag++;
120 			break;
121 
122 		case 'f':
123 			skipclean = 0;
124 			break;
125 
126 		case 'F':
127 			bkgrdcheck = 1;
128 			break;
129 
130 		case 'm':
131 			lfmode = argtoimax('m', "mode", optarg, 8);
132 			if (lfmode &~ 07777)
133 				errx(EEXIT, "bad mode to -m: %o", lfmode);
134 			printf("** lost+found creation mode %o\n", lfmode);
135 			break;
136 
137 		case 'n':
138 			nflag++;
139 			yflag = 0;
140 			break;
141 
142 		case 'p':
143 			preen++;
144 			/*FALLTHROUGH*/
145 
146 		case 'C':
147 			ckclean++;
148 			break;
149 
150 		case 'R':
151 			wantrestart = 1;
152 			break;
153 		case 'r':
154 			inoopt++;
155 			break;
156 
157 		case 'S':
158 			surrender = 1;
159 			break;
160 
161 		case 'y':
162 			yflag++;
163 			nflag = 0;
164 			break;
165 
166 		case 'Z':
167 			Zflag++;
168 			break;
169 
170 		case 'z':
171 			zflag++;
172 			break;
173 
174 		default:
175 			usage();
176 		}
177 	}
178 	argc -= optind;
179 	argv += optind;
180 
181 	if (!argc)
182 		usage();
183 
184 	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
185 		(void)signal(SIGINT, catch);
186 	if (ckclean)
187 		(void)signal(SIGQUIT, catchquit);
188 	signal(SIGINFO, infohandler);
189 	if (bkgrdflag) {
190 		signal(SIGALRM, alarmhandler);
191 		itimerval.it_interval.tv_sec = 5;
192 		itimerval.it_interval.tv_usec = 0;
193 		itimerval.it_value.tv_sec = 5;
194 		itimerval.it_value.tv_usec = 0;
195 		setitimer(ITIMER_REAL, &itimerval, NULL);
196 	}
197 	/*
198 	 * Push up our allowed memory limit so we can cope
199 	 * with huge file systems.
200 	 */
201 	if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
202 		rlimit.rlim_cur = rlimit.rlim_max;
203 		(void)setrlimit(RLIMIT_DATA, &rlimit);
204 	}
205 	while (argc > 0) {
206 		if ((fsret = checkfilesys(*argv)) == ERESTART)
207 			continue;
208 		ret |= fsret;
209 		argc--;
210 		argv++;
211 	}
212 
213 	if (returntosingle)
214 		ret = 2;
215 	exit(ret);
216 }
217 
218 static intmax_t
219 argtoimax(int flag, const char *req, const char *str, int base)
220 {
221 	char *cp;
222 	intmax_t ret;
223 
224 	ret = strtoimax(str, &cp, base);
225 	if (cp == str || *cp)
226 		errx(EEXIT, "-%c flag requires a %s", flag, req);
227 	return (ret);
228 }
229 
230 /*
231  * Check the specified file system.
232  */
233 /* ARGSUSED */
234 static int
235 checkfilesys(char *filesys)
236 {
237 	ufs2_daddr_t n_ffree, n_bfree;
238 	struct dups *dp;
239 	struct statfs *mntp;
240 	struct stat snapdir;
241 	struct group *grp;
242 	struct iovec *iov;
243 	char errmsg[255];
244 	int ofsmodified;
245 	int iovlen;
246 	intmax_t blks, files;
247 	size_t size;
248 
249 	iov = NULL;
250 	iovlen = 0;
251 	errmsg[0] = '\0';
252 	fsutilinit();
253 	fsckinit();
254 
255 	cdevname = filesys;
256 	if (debug && ckclean)
257 		pwarn("starting\n");
258 	/*
259 	 * Make best effort to get the disk name. Check first to see
260 	 * if it is listed among the mounted file systems. Failing that
261 	 * check to see if it is listed in /etc/fstab.
262 	 */
263 	mntp = getmntpt(filesys);
264 	if (mntp != NULL)
265 		filesys = mntp->f_mntfromname;
266 	else
267 		filesys = blockcheck(filesys);
268 	/*
269 	 * If -F flag specified, check to see whether a background check
270 	 * is possible and needed. If possible and needed, exit with
271 	 * status zero. Otherwise exit with status non-zero. A non-zero
272 	 * exit status will cause a foreground check to be run.
273 	 */
274 	sblock_init();
275 	if (bkgrdcheck) {
276 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
277 			exit(3);	/* Cannot read superblock */
278 		close(fsreadfd);
279 		/* Earlier background failed or journaled */
280 		if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
281 			exit(4);
282 		if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
283 			exit(5);	/* Not running soft updates */
284 		size = MIBSIZE;
285 		if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
286 			exit(6);	/* Lacks kernel support */
287 		if ((mntp == NULL && sblock.fs_clean == 1) ||
288 		    (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
289 			exit(7);	/* Filesystem clean, report it now */
290 		exit(0);
291 	}
292 	if (ckclean && skipclean) {
293 		/*
294 		 * If file system is gjournaled, check it here.
295 		 */
296 		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
297 			exit(3);	/* Cannot read superblock */
298 		if (nflag || (fswritefd = open(filesys, O_WRONLY)) < 0) {
299 			fswritefd = -1;
300 			if (preen)
301 				pfatal("NO WRITE ACCESS");
302 			printf(" (NO WRITE)");
303 		}
304 		if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
305 			//printf("GJournaled file system detected on %s.\n",
306 			//    filesys);
307 			if (sblock.fs_clean == 1) {
308 				pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
309 				exit(0);
310 			}
311 			if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
312 				bufinit();
313 				gjournal_check(filesys);
314 				if (chkdoreload(mntp) == 0)
315 					exit(0);
316 				exit(4);
317 			} else {
318 				pfatal(
319 			    "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
320 				close(fsreadfd);
321 				close(fswritefd);
322 			}
323 		}
324 	}
325 	/*
326 	 * If we are to do a background check:
327 	 *	Get the mount point information of the file system
328 	 *	create snapshot file
329 	 *	return created snapshot file
330 	 *	if not found, clear bkgrdflag and proceed with normal fsck
331 	 */
332 	if (bkgrdflag) {
333 		if (mntp == NULL) {
334 			bkgrdflag = 0;
335 			pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
336 		} else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
337 			bkgrdflag = 0;
338 			pfatal(
339 			  "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
340 		} else if ((mntp->f_flags & MNT_RDONLY) != 0) {
341 			bkgrdflag = 0;
342 			pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
343 		} else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
344 			if (readsb(0) != 0) {
345 				if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
346 					bkgrdflag = 0;
347 					pfatal(
348 			"UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
349 				}
350 				if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
351 				    skipclean && ckclean) {
352 					/*
353 					 * file system is clean;
354 					 * skip snapshot and report it clean
355 					 */
356 					pwarn(
357 					"FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
358 					goto clean;
359 				}
360 			}
361 			close(fsreadfd);
362 		}
363 		if (bkgrdflag) {
364 			snprintf(snapname, sizeof snapname, "%s/.snap",
365 			    mntp->f_mntonname);
366 			if (stat(snapname, &snapdir) < 0) {
367 				if (errno != ENOENT) {
368 					bkgrdflag = 0;
369 					pfatal(
370 	"CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
371 					    snapname, strerror(errno));
372 				} else if ((grp = getgrnam("operator")) == NULL ||
373 					   mkdir(snapname, 0770) < 0 ||
374 					   chown(snapname, -1, grp->gr_gid) < 0 ||
375 					   chmod(snapname, 0770) < 0) {
376 					bkgrdflag = 0;
377 					pfatal(
378 	"CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
379 					    snapname, strerror(errno));
380 				}
381 			} else if (!S_ISDIR(snapdir.st_mode)) {
382 				bkgrdflag = 0;
383 				pfatal(
384 			"%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
385 				    snapname);
386 			}
387 		}
388 		if (bkgrdflag) {
389 			snprintf(snapname, sizeof snapname,
390 			    "%s/.snap/fsck_snapshot", mntp->f_mntonname);
391 			build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
392 			build_iovec(&iov, &iovlen, "from", snapname,
393 			    (size_t)-1);
394 			build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
395 			    (size_t)-1);
396 			build_iovec(&iov, &iovlen, "errmsg", errmsg,
397 			    sizeof(errmsg));
398 			build_iovec(&iov, &iovlen, "update", NULL, 0);
399 			build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
400 
401 			while (nmount(iov, iovlen, mntp->f_flags) < 0) {
402 				if (errno == EEXIST && unlink(snapname) == 0)
403 					continue;
404 				bkgrdflag = 0;
405 				pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
406 				    snapname, strerror(errno), errmsg);
407 				break;
408 			}
409 			if (bkgrdflag != 0)
410 				filesys = snapname;
411 		}
412 	}
413 
414 	switch (setup(filesys)) {
415 	case 0:
416 		if (preen)
417 			pfatal("CAN'T CHECK FILE SYSTEM.");
418 		return (EEXIT);
419 	case -1:
420 	clean:
421 		pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
422 		    sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
423 		printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
424 		    (intmax_t)sblock.fs_cstotal.cs_nffree,
425 		    (intmax_t)sblock.fs_cstotal.cs_nbfree,
426 		    sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
427 		return (0);
428 	}
429 	/*
430 	 * Determine if we can and should do journal recovery.
431 	 */
432 	if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
433 		if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
434 			sujrecovery = 1;
435 			if (suj_check(filesys) == 0) {
436 				printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
437 				if (chkdoreload(mntp) == 0)
438 					exit(0);
439 				exit(4);
440 			}
441 			sujrecovery = 0;
442 			printf("** Skipping journal, falling through to full fsck\n\n");
443 		}
444 		if (fswritefd != -1) {
445 			/*
446 			 * Write the superblock so we don't try to recover the
447 			 * journal on another pass. If this is the only change
448 			 * to the filesystem, we do not want it to be called
449 			 * out as modified.
450 			 */
451 			sblock.fs_mtime = time(NULL);
452 			sbdirty();
453 			ofsmodified = fsmodified;
454 			flush(fswritefd, &sblk);
455 			fsmodified = ofsmodified;
456 		}
457 	}
458 	/*
459 	 * If the filesystem was run on an old kernel that did not
460 	 * support check hashes, clear the check-hash flags so that
461 	 * we do not try to verify them.
462 	 */
463 	if ((sblock.fs_flags & FS_METACKHASH) == 0)
464 		sblock.fs_metackhash = 0;
465 	/*
466 	 * If we are running on a kernel that can provide check hashes
467 	 * that are not yet enabled for the filesystem and we are
468 	 * running manually without the -y flag, offer to add any
469 	 * supported check hashes that are not already enabled.
470 	 */
471 	ckhashadd = 0;
472 	if (preen == 0 && yflag == 0 && sblock.fs_magic != FS_UFS1_MAGIC &&
473 	    fswritefd != -1 && getosreldate() >= P_OSREL_CK_CYLGRP) {
474 		if ((sblock.fs_metackhash & CK_CYLGRP) == 0 &&
475 		    reply("ADD CYLINDER GROUP CHECK-HASH PROTECTION") != 0) {
476 			ckhashadd |= CK_CYLGRP;
477 			sblock.fs_metackhash |= CK_CYLGRP;
478 		}
479 		if ((sblock.fs_metackhash & CK_SUPERBLOCK) == 0 &&
480 		    getosreldate() >= P_OSREL_CK_SUPERBLOCK &&
481 		    reply("ADD SUPERBLOCK CHECK-HASH PROTECTION") != 0) {
482 			ckhashadd |= CK_SUPERBLOCK;
483 			sblock.fs_metackhash |= CK_SUPERBLOCK;
484 		}
485 		if ((sblock.fs_metackhash & CK_INODE) == 0 &&
486 		    getosreldate() >= P_OSREL_CK_INODE &&
487 		    reply("ADD INODE CHECK-HASH PROTECTION") != 0) {
488 			ckhashadd |= CK_INODE;
489 			sblock.fs_metackhash |= CK_INODE;
490 		}
491 #ifdef notyet
492 		if ((sblock.fs_metackhash & CK_INDIR) == 0 &&
493 		    getosreldate() >= P_OSREL_CK_INDIR &&
494 		    reply("ADD INDIRECT BLOCK CHECK-HASH PROTECTION") != 0) {
495 			ckhashadd |= CK_INDIR;
496 			sblock.fs_metackhash |= CK_INDIR;
497 		}
498 		if ((sblock.fs_metackhash & CK_DIR) == 0 &&
499 		    getosreldate() >= P_OSREL_CK_DIR &&
500 		    reply("ADD DIRECTORY CHECK-HASH PROTECTION") != 0) {
501 			ckhashadd |= CK_DIR;
502 			sblock.fs_metackhash |= CK_DIR;
503 		}
504 #endif /* notyet */
505 		if (ckhashadd != 0) {
506 			sblock.fs_flags |= FS_METACKHASH;
507 			sbdirty();
508 		}
509 	}
510 	/*
511 	 * Cleared if any questions answered no. Used to decide if
512 	 * the superblock should be marked clean.
513 	 */
514 	resolved = 1;
515 	/*
516 	 * 1: scan inodes tallying blocks used
517 	 */
518 	if (preen == 0) {
519 		printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
520 		if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
521 			printf("** Root file system\n");
522 		printf("** Phase 1 - Check Blocks and Sizes\n");
523 	}
524 	clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
525 	pass1();
526 	IOstats("Pass1");
527 
528 	/*
529 	 * 1b: locate first references to duplicates, if any
530 	 */
531 	if (duplist) {
532 		if (preen || usedsoftdep)
533 			pfatal("INTERNAL ERROR: dups with %s%s%s",
534 			    preen ? "-p" : "",
535 			    (preen && usedsoftdep) ? " and " : "",
536 			    usedsoftdep ? "softupdates" : "");
537 		printf("** Phase 1b - Rescan For More DUPS\n");
538 		pass1b();
539 		IOstats("Pass1b");
540 	}
541 
542 	/*
543 	 * 2: traverse directories from root to mark all connected directories
544 	 */
545 	if (preen == 0)
546 		printf("** Phase 2 - Check Pathnames\n");
547 	pass2();
548 	IOstats("Pass2");
549 
550 	/*
551 	 * 3: scan inodes looking for disconnected directories
552 	 */
553 	if (preen == 0)
554 		printf("** Phase 3 - Check Connectivity\n");
555 	pass3();
556 	IOstats("Pass3");
557 
558 	/*
559 	 * 4: scan inodes looking for disconnected files; check reference counts
560 	 */
561 	if (preen == 0)
562 		printf("** Phase 4 - Check Reference Counts\n");
563 	pass4();
564 	IOstats("Pass4");
565 
566 	/*
567 	 * 5: check and repair resource counts in cylinder groups
568 	 */
569 	if (preen == 0)
570 		printf("** Phase 5 - Check Cyl groups\n");
571 	pass5();
572 	IOstats("Pass5");
573 
574 	/*
575 	 * print out summary statistics
576 	 */
577 	n_ffree = sblock.fs_cstotal.cs_nffree;
578 	n_bfree = sblock.fs_cstotal.cs_nbfree;
579 	files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
580 	blks = n_blks +
581 	    sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
582 	blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
583 	blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
584 	blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
585 	if (bkgrdflag && (files > 0 || blks > 0)) {
586 		countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
587 		pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
588 		    countdirs, files - countdirs, blks);
589 	}
590 	pwarn("%ld files, %jd used, %ju free ",
591 	    (long)n_files, (intmax_t)n_blks,
592 	    (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
593 	printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
594 	    (uintmax_t)n_ffree, (uintmax_t)n_bfree,
595 	    n_ffree * 100.0 / sblock.fs_dsize);
596 	if (debug) {
597 		if (files < 0)
598 			printf("%jd inodes missing\n", -files);
599 		if (blks < 0)
600 			printf("%jd blocks missing\n", -blks);
601 		if (duplist != NULL) {
602 			printf("The following duplicate blocks remain:");
603 			for (dp = duplist; dp; dp = dp->next)
604 				printf(" %jd,", (intmax_t)dp->dup);
605 			printf("\n");
606 		}
607 	}
608 	duplist = (struct dups *)0;
609 	muldup = (struct dups *)0;
610 	inocleanup();
611 	if (fsmodified) {
612 		sblock.fs_time = time(NULL);
613 		sbdirty();
614 	}
615 	if (cvtlevel && (sblk.b_flags & B_DIRTY) != 0) {
616 		/*
617 		 * Write out the duplicate super blocks
618 		 */
619 		if (sbput(fswritefd, &sblock, sblock.fs_ncg) == 0)
620 			fsmodified = 1;
621 	}
622 	if (rerun)
623 		resolved = 0;
624 
625 	/*
626 	 * Check to see if the file system is mounted read-write.
627 	 */
628 	if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
629 		resolved = 0;
630 	ckfini(resolved);
631 
632 	if (fsmodified && !preen)
633 		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
634 	if (rerun) {
635 		if (wantrestart && (restarts++ < 10) &&
636 		    (preen || reply("RESTART")))
637 			return (ERESTART);
638 		printf("\n***** PLEASE RERUN FSCK *****\n");
639 	}
640 	if (chkdoreload(mntp) != 0) {
641 		if (!fsmodified)
642 			return (0);
643 		if (!preen)
644 			printf("\n***** REBOOT NOW *****\n");
645 		sync();
646 		return (4);
647 	}
648 	return (rerun ? ERERUN : 0);
649 }
650 
651 static int
652 chkdoreload(struct statfs *mntp)
653 {
654 	struct iovec *iov;
655 	int iovlen;
656 	char errmsg[255];
657 
658 	if (mntp == NULL)
659 		return (0);
660 
661 	iov = NULL;
662 	iovlen = 0;
663 	errmsg[0] = '\0';
664 	/*
665 	 * We modified a mounted file system.  Do a mount update on
666 	 * it unless it is read-write, so we can continue using it
667 	 * as safely as possible.
668 	 */
669 	if (mntp->f_flags & MNT_RDONLY) {
670 		build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
671 		build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
672 		    (size_t)-1);
673 		build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
674 		    (size_t)-1);
675 		build_iovec(&iov, &iovlen, "errmsg", errmsg,
676 		    sizeof(errmsg));
677 		build_iovec(&iov, &iovlen, "update", NULL, 0);
678 		build_iovec(&iov, &iovlen, "reload", NULL, 0);
679 		/*
680 		 * XX: We need the following line until we clean up
681 		 * nmount parsing of root mounts and NFS root mounts.
682 		 */
683 		build_iovec(&iov, &iovlen, "ro", NULL, 0);
684 		if (nmount(iov, iovlen, mntp->f_flags) == 0) {
685 			return (0);
686 		}
687 		pwarn("mount reload of '%s' failed: %s %s\n\n",
688 		    mntp->f_mntonname, strerror(errno), errmsg);
689 		return (1);
690 	}
691 	return (0);
692 }
693 
694 /*
695  * Get the mount point information for name.
696  */
697 static struct statfs *
698 getmntpt(const char *name)
699 {
700 	struct stat devstat, mntdevstat;
701 	char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
702 	char *ddevname;
703 	struct statfs *mntbuf, *statfsp;
704 	int i, mntsize, isdev;
705 
706 	if (stat(name, &devstat) != 0)
707 		return (NULL);
708 	if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
709 		isdev = 1;
710 	else
711 		isdev = 0;
712 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
713 	for (i = 0; i < mntsize; i++) {
714 		statfsp = &mntbuf[i];
715 		ddevname = statfsp->f_mntfromname;
716 		if (*ddevname != '/') {
717 			if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
718 			    sizeof(statfsp->f_mntfromname))
719 				continue;
720 			strcpy(device, _PATH_DEV);
721 			strcat(device, ddevname);
722 			strcpy(statfsp->f_mntfromname, device);
723 		}
724 		if (isdev == 0) {
725 			if (strcmp(name, statfsp->f_mntonname))
726 				continue;
727 			return (statfsp);
728 		}
729 		if (stat(ddevname, &mntdevstat) == 0 &&
730 		    mntdevstat.st_rdev == devstat.st_rdev)
731 			return (statfsp);
732 	}
733 	statfsp = NULL;
734 	return (statfsp);
735 }
736 
737 static void
738 usage(void)
739 {
740 	(void) fprintf(stderr,
741 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
742 	    getprogname());
743 	exit(1);
744 }
745 
746 void
747 infohandler(int sig __unused)
748 {
749 	got_siginfo = 1;
750 }
751 
752 void
753 alarmhandler(int sig __unused)
754 {
755 	got_sigalarm = 1;
756 }
757