main.c revision 92839 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1986, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 5/14/95";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/sbin/fsck_ffs/main.c 92839 2002-03-20 22:57:10Z imp $";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/stat.h>
50#include <sys/file.h>
51#include <sys/time.h>
52#include <sys/mount.h>
53#include <sys/resource.h>
54#include <sys/sysctl.h>
55
56#include <ufs/ufs/dinode.h>
57#include <ufs/ufs/ufsmount.h>
58#include <ufs/ffs/fs.h>
59
60#include <err.h>
61#include <errno.h>
62#include <fstab.h>
63#include <paths.h>
64#include <string.h>
65
66#include "fsck.h"
67
68static void usage(void) __dead2;
69static int argtoi(int flag, char *req, char *str, int base);
70static int checkfilesys(char *filesys);
71static struct statfs *getmntpt(const char *);
72
73int
74main(int argc, char *argv[])
75{
76	int ch;
77	struct rlimit rlimit;
78	int ret = 0;
79
80	sync();
81	skipclean = 1;
82	while ((ch = getopt(argc, argv, "b:Bc:dfFm:npy")) != -1) {
83		switch (ch) {
84		case 'b':
85			skipclean = 0;
86			bflag = argtoi('b', "number", optarg, 10);
87			printf("Alternate super block location: %d\n", bflag);
88			break;
89
90		case 'B':
91			bkgrdflag = 1;
92			break;
93
94		case 'c':
95			skipclean = 0;
96			cvtlevel = argtoi('c', "conversion level", optarg, 10);
97			break;
98
99		case 'd':
100			debug++;
101			break;
102
103		case 'f':
104			skipclean = 0;
105			break;
106
107		case 'F':
108			bkgrdcheck = 1;
109			break;
110
111		case 'm':
112			lfmode = argtoi('m', "mode", optarg, 8);
113			if (lfmode &~ 07777)
114				errx(EEXIT, "bad mode to -m: %o", lfmode);
115			printf("** lost+found creation mode %o\n", lfmode);
116			break;
117
118		case 'n':
119			nflag++;
120			yflag = 0;
121			break;
122
123		case 'p':
124			preen++;
125			break;
126
127		case 'y':
128			yflag++;
129			nflag = 0;
130			break;
131
132		default:
133			usage();
134		}
135	}
136	argc -= optind;
137	argv += optind;
138
139	if (!argc)
140		usage();
141
142	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
143		(void)signal(SIGINT, catch);
144	if (preen)
145		(void)signal(SIGQUIT, catchquit);
146	signal(SIGINFO, infohandler);
147	/*
148	 * Push up our allowed memory limit so we can cope
149	 * with huge filesystems.
150	 */
151	if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
152		rlimit.rlim_cur = rlimit.rlim_max;
153		(void)setrlimit(RLIMIT_DATA, &rlimit);
154	}
155	while (argc-- > 0)
156		(void)checkfilesys(*argv++);
157
158	if (returntosingle)
159		ret = 2;
160	exit(ret);
161}
162
163static int
164argtoi(int flag, char *req, char *str, int base)
165{
166	char *cp;
167	int ret;
168
169	ret = (int)strtol(str, &cp, base);
170	if (cp == str || *cp)
171		errx(EEXIT, "-%c flag requires a %s", flag, req);
172	return (ret);
173}
174
175/*
176 * Check the specified filesystem.
177 */
178/* ARGSUSED */
179static int
180checkfilesys(char *filesys)
181{
182	ufs_daddr_t n_ffree, n_bfree;
183	struct ufs_args args;
184	struct dups *dp;
185	struct statfs *mntp;
186	struct zlncnt *zlnp;
187	ufs_daddr_t blks;
188	ufs_daddr_t files;
189	int cylno, size;
190
191	cdevname = filesys;
192	if (debug && preen)
193		pwarn("starting\n");
194	/*
195	 * Make best effort to get the disk name. Check first to see
196	 * if it is listed among the mounted filesystems. Failing that
197	 * check to see if it is listed in /etc/fstab.
198	 */
199	mntp = getmntpt(filesys);
200	if (mntp != NULL)
201		filesys = mntp->f_mntfromname;
202	else
203		filesys = blockcheck(filesys);
204	/*
205	 * If -F flag specified, check to see whether a background check
206	 * is possible and needed. If possible and needed, exit with
207	 * status zero. Otherwise exit with status non-zero. A non-zero
208	 * exit status will cause a foreground check to be run.
209	 */
210	sblock_init();
211	if (bkgrdcheck) {
212		if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
213			exit(3);	/* Cannot read superblock */
214		close(fsreadfd);
215		if (sblock.fs_flags & FS_NEEDSFSCK)
216			exit(4);	/* Earlier background failed */
217		if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
218			exit(5);	/* Not running soft updates */
219		size = MIBSIZE;
220		if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
221			exit(6);	/* Lacks kernel support */
222		if ((mntp == NULL && sblock.fs_clean == 1) ||
223		    (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
224			exit(7);	/* Filesystem clean, report it now */
225		exit(0);
226	}
227	/*
228	 * If we are to do a background check:
229	 *	Get the mount point information of the filesystem
230	 *	create snapshot file
231	 *	return created snapshot file
232	 *	if not found, clear bkgrdflag and proceed with normal fsck
233	 */
234	if (bkgrdflag) {
235		if (mntp == NULL) {
236			bkgrdflag = 0;
237			pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
238		} else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
239			bkgrdflag = 0;
240			pfatal("NOT USING SOFT UPDATES, %s\n",
241			    "CANNOT RUN IN BACKGROUND");
242		} else if ((mntp->f_flags & MNT_RDONLY) != 0) {
243			bkgrdflag = 0;
244			pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
245		} else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
246			if (readsb(0) != 0) {
247				if (sblock.fs_flags & FS_NEEDSFSCK) {
248					bkgrdflag = 0;
249					pfatal("UNEXPECTED INCONSISTENCY, %s\n",
250					    "CANNOT RUN IN BACKGROUND\n");
251				}
252				if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
253				    skipclean && preen) {
254					/*
255					 * filesystem is clean;
256					 * skip snapshot and report it clean
257					 */
258					pwarn("FILESYSTEM CLEAN; %s\n",
259					    "SKIPPING CHECKS");
260					goto clean;
261				}
262			}
263			close(fsreadfd);
264		}
265		if (bkgrdflag) {
266			snprintf(snapname, sizeof snapname, "%s/.fsck_snapshot",
267			    mntp->f_mntonname);
268			args.fspec = snapname;
269			while (mount("ffs", mntp->f_mntonname,
270			    mntp->f_flags | MNT_UPDATE | MNT_SNAPSHOT,
271			    &args) < 0) {
272				if (errno == EEXIST && unlink(snapname) == 0)
273					continue;
274				bkgrdflag = 0;
275				pfatal("CANNOT CREATE SNAPSHOT %s: %s\n",
276				    snapname, strerror(errno));
277				break;
278			}
279			if (bkgrdflag != 0)
280				filesys = snapname;
281		}
282	}
283
284	switch (setup(filesys)) {
285	case 0:
286		if (preen)
287			pfatal("CAN'T CHECK FILE SYSTEM.");
288		return (0);
289	case -1:
290	clean:
291		pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
292		    sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
293		printf("(%d frags, %d blocks, %.1f%% fragmentation)\n",
294		    sblock.fs_cstotal.cs_nffree, sblock.fs_cstotal.cs_nbfree,
295		    sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
296		return (0);
297	}
298
299	/*
300	 * Cleared if any questions answered no. Used to decide if
301	 * the superblock should be marked clean.
302	 */
303	resolved = 1;
304	/*
305	 * 1: scan inodes tallying blocks used
306	 */
307	if (preen == 0) {
308		printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
309		if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
310			printf("** Root file system\n");
311		printf("** Phase 1 - Check Blocks and Sizes\n");
312	}
313	pass1();
314
315	/*
316	 * 1b: locate first references to duplicates, if any
317	 */
318	if (duplist) {
319		if (preen || usedsoftdep)
320			pfatal("INTERNAL ERROR: dups with -p");
321		printf("** Phase 1b - Rescan For More DUPS\n");
322		pass1b();
323	}
324
325	/*
326	 * 2: traverse directories from root to mark all connected directories
327	 */
328	if (preen == 0)
329		printf("** Phase 2 - Check Pathnames\n");
330	pass2();
331
332	/*
333	 * 3: scan inodes looking for disconnected directories
334	 */
335	if (preen == 0)
336		printf("** Phase 3 - Check Connectivity\n");
337	pass3();
338
339	/*
340	 * 4: scan inodes looking for disconnected files; check reference counts
341	 */
342	if (preen == 0)
343		printf("** Phase 4 - Check Reference Counts\n");
344	pass4();
345
346	/*
347	 * 5: check and repair resource counts in cylinder groups
348	 */
349	if (preen == 0)
350		printf("** Phase 5 - Check Cyl groups\n");
351	pass5();
352
353	/*
354	 * print out summary statistics
355	 */
356	n_ffree = sblock.fs_cstotal.cs_nffree;
357	n_bfree = sblock.fs_cstotal.cs_nbfree;
358	files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
359	blks = n_blks +
360	    sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
361	blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
362	blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
363	blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
364	if (bkgrdflag && (files > 0 || blks > 0)) {
365		countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
366		pwarn("Reclaimed: %ld directories, %ld files, %d fragments\n",
367		    countdirs, (long)files - countdirs, blks);
368	}
369	pwarn("%ld files, %ld used, %ld free ",
370	    (long)n_files, (long)n_blks, (long)(n_ffree +
371	    sblock.fs_frag * n_bfree));
372	printf("(%d frags, %d blocks, %.1f%% fragmentation)\n",
373	    n_ffree, n_bfree, n_ffree * 100.0 / sblock.fs_dsize);
374	if (debug) {
375		if (files < 0)
376			printf("%d inodes missing\n", -files);
377		if (blks < 0)
378			printf("%d blocks missing\n", -blks);
379		if (duplist != NULL) {
380			printf("The following duplicate blocks remain:");
381			for (dp = duplist; dp; dp = dp->next)
382				printf(" %d,", dp->dup);
383			printf("\n");
384		}
385		if (zlnhead != NULL) {
386			printf("The following zero link count inodes remain:");
387			for (zlnp = zlnhead; zlnp; zlnp = zlnp->next)
388				printf(" %u,", zlnp->zlncnt);
389			printf("\n");
390		}
391	}
392	zlnhead = (struct zlncnt *)0;
393	duplist = (struct dups *)0;
394	muldup = (struct dups *)0;
395	inocleanup();
396	if (fsmodified) {
397		sblock.fs_time = time(NULL);
398		sbdirty();
399	}
400	if (cvtlevel && sblk.b_dirty) {
401		/*
402		 * Write out the duplicate super blocks
403		 */
404		for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
405			bwrite(fswritefd, (char *)&sblock,
406			    fsbtodb(&sblock, cgsblock(&sblock, cylno)), SBSIZE);
407	}
408	if (rerun)
409		resolved = 0;
410
411	/*
412	 * Check to see if the filesystem is mounted read-write.
413	 */
414	if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
415		resolved = 0;
416	ckfini(resolved);
417
418	for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
419		if (inostathead[cylno].il_stat != NULL)
420			free((char *)inostathead[cylno].il_stat);
421	free((char *)inostathead);
422	inostathead = NULL;
423	if (fsmodified && !preen)
424		printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
425	if (rerun)
426		printf("\n***** PLEASE RERUN FSCK *****\n");
427	if (mntp != NULL) {
428		struct ufs_args args;
429		int ret;
430		/*
431		 * We modified a mounted filesystem.  Do a mount update on
432		 * it unless it is read-write, so we can continue using it
433		 * as safely as possible.
434		 */
435		if (mntp->f_flags & MNT_RDONLY) {
436			args.fspec = 0;
437			args.export.ex_flags = 0;
438			args.export.ex_root = 0;
439			ret = mount("ufs", mntp->f_mntonname,
440			    mntp->f_flags | MNT_UPDATE | MNT_RELOAD, &args);
441			if (ret == 0)
442				return (0);
443			pwarn("mount reload of '%s' failed: %s\n\n",
444			    mntp->f_mntonname, strerror(errno));
445		}
446		if (!fsmodified)
447			return (0);
448		if (!preen)
449			printf("\n***** REBOOT NOW *****\n");
450		sync();
451		return (4);
452	}
453	return (0);
454}
455
456/*
457 * Get the mount point information for name.
458 */
459static struct statfs *
460getmntpt(const char *name)
461{
462	struct stat devstat, mntdevstat;
463	char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
464	char *devname;
465	struct statfs *mntbuf, *statfsp;
466	int i, mntsize, isdev;
467
468	if (stat(name, &devstat) != 0)
469		return (NULL);
470	if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
471		isdev = 1;
472	else
473		isdev = 0;
474	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
475	for (i = 0; i < mntsize; i++) {
476		statfsp = &mntbuf[i];
477		devname = statfsp->f_mntfromname;
478		if (*devname != '/') {
479			strcpy(device, _PATH_DEV);
480			strcat(device, devname);
481			strcpy(statfsp->f_mntfromname, device);
482		}
483		if (isdev == 0) {
484			if (strcmp(name, statfsp->f_mntonname))
485				continue;
486			return (statfsp);
487		}
488		if (stat(devname, &mntdevstat) == 0 &&
489		    mntdevstat.st_rdev == devstat.st_rdev)
490			return (statfsp);
491	}
492	statfsp = NULL;
493	return (statfsp);
494}
495
496static void
497usage(void)
498{
499        extern char *__progname;
500
501        (void) fprintf(stderr,
502            "Usage: %s [-BFpfny] [-b block] [-c level] [-m mode] "
503                        "filesystem ...\n",
504            __progname);
505        exit(1);
506}
507