fsutil.c revision 96483 
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
35#if 0
36static const char sccsid[] = "@(#)utilities.c	8.6 (Berkeley) 5/19/95";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/sbin/fsck_ffs/fsutil.c 96483 2002-05-12 23:44:15Z phk $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/types.h>
44#include <sys/sysctl.h>
45#include <sys/stat.h>
46#include <sys/disklabel.h>
47
48#include <ufs/ufs/dinode.h>
49#include <ufs/ufs/dir.h>
50#include <ufs/ffs/fs.h>
51
52#include <err.h>
53#include <errno.h>
54#include <string.h>
55#include <ctype.h>
56#include <fstab.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <unistd.h>
60
61#include "fsck.h"
62
63long	diskreads, totalreads;	/* Disk cache statistics */
64
65int
66ftypeok(struct dinode *dp)
67{
68	switch (dp->di_mode & IFMT) {
69
70	case IFDIR:
71	case IFREG:
72	case IFBLK:
73	case IFCHR:
74	case IFLNK:
75	case IFSOCK:
76	case IFIFO:
77		return (1);
78
79	default:
80		if (debug)
81			printf("bad file type 0%o\n", dp->di_mode);
82		return (0);
83	}
84}
85
86int
87reply(char *question)
88{
89	int persevere;
90	char c;
91
92	if (preen)
93		pfatal("INTERNAL ERROR: GOT TO reply()");
94	persevere = !strcmp(question, "CONTINUE");
95	printf("\n");
96	if (!persevere && (nflag || (fswritefd < 0 && bkgrdflag == 0))) {
97		printf("%s? no\n\n", question);
98		resolved = 0;
99		return (0);
100	}
101	if (yflag || (persevere && nflag)) {
102		printf("%s? yes\n\n", question);
103		return (1);
104	}
105	do	{
106		printf("%s? [yn] ", question);
107		(void) fflush(stdout);
108		c = getc(stdin);
109		while (c != '\n' && getc(stdin) != '\n') {
110			if (feof(stdin)) {
111				resolved = 0;
112				return (0);
113			}
114		}
115	} while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
116	printf("\n");
117	if (c == 'y' || c == 'Y')
118		return (1);
119	resolved = 0;
120	return (0);
121}
122
123/*
124 * Look up state information for an inode.
125 */
126struct inostat *
127inoinfo(ino_t inum)
128{
129	static struct inostat unallocated = { USTATE, 0, 0 };
130	struct inostatlist *ilp;
131	int iloff;
132
133	if (inum > maxino)
134		errx(EEXIT, "inoinfo: inumber %d out of range", inum);
135	ilp = &inostathead[inum / sblock.fs_ipg];
136	iloff = inum % sblock.fs_ipg;
137	if (iloff >= ilp->il_numalloced)
138		return (&unallocated);
139	return (&ilp->il_stat[iloff]);
140}
141
142/*
143 * Malloc buffers and set up cache.
144 */
145void
146bufinit(void)
147{
148	struct bufarea *bp;
149	long bufcnt, i;
150	char *bufp;
151
152	pbp = pdirbp = (struct bufarea *)0;
153	bufp = malloc((unsigned int)sblock.fs_bsize);
154	if (bufp == 0)
155		errx(EEXIT, "cannot allocate buffer pool");
156	cgblk.b_un.b_buf = bufp;
157	initbarea(&cgblk);
158	bufhead.b_next = bufhead.b_prev = &bufhead;
159	bufcnt = MAXBUFSPACE / sblock.fs_bsize;
160	if (bufcnt < MINBUFS)
161		bufcnt = MINBUFS;
162	for (i = 0; i < bufcnt; i++) {
163		bp = (struct bufarea *)malloc(sizeof(struct bufarea));
164		bufp = malloc((unsigned int)sblock.fs_bsize);
165		if (bp == NULL || bufp == NULL) {
166			if (i >= MINBUFS)
167				break;
168			errx(EEXIT, "cannot allocate buffer pool");
169		}
170		bp->b_un.b_buf = bufp;
171		bp->b_prev = &bufhead;
172		bp->b_next = bufhead.b_next;
173		bufhead.b_next->b_prev = bp;
174		bufhead.b_next = bp;
175		initbarea(bp);
176	}
177	bufhead.b_size = i;	/* save number of buffers */
178}
179
180/*
181 * Manage a cache of directory blocks.
182 */
183struct bufarea *
184getdatablk(ufs_daddr_t blkno, long size)
185{
186	struct bufarea *bp;
187
188	for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
189		if (bp->b_bno == fsbtodb(&sblock, blkno))
190			goto foundit;
191	for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
192		if ((bp->b_flags & B_INUSE) == 0)
193			break;
194	if (bp == &bufhead)
195		errx(EEXIT, "deadlocked buffer pool");
196	getblk(bp, blkno, size);
197	/* fall through */
198foundit:
199	bp->b_prev->b_next = bp->b_next;
200	bp->b_next->b_prev = bp->b_prev;
201	bp->b_prev = &bufhead;
202	bp->b_next = bufhead.b_next;
203	bufhead.b_next->b_prev = bp;
204	bufhead.b_next = bp;
205	bp->b_flags |= B_INUSE;
206	return (bp);
207}
208
209void
210getblk(struct bufarea *bp, ufs_daddr_t blk, long size)
211{
212	ufs_daddr_t dblk;
213
214	totalreads++;
215	dblk = fsbtodb(&sblock, blk);
216	if (bp->b_bno != dblk) {
217		flush(fswritefd, bp);
218		diskreads++;
219		bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size);
220		bp->b_bno = dblk;
221		bp->b_size = size;
222	}
223}
224
225void
226flush(int fd, struct bufarea *bp)
227{
228	int i, j;
229
230	if (!bp->b_dirty)
231		return;
232	bp->b_dirty = 0;
233	if (fswritefd < 0) {
234		pfatal("WRITING IN READ_ONLY MODE.\n");
235		return;
236	}
237	if (bp->b_errs != 0)
238		pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n",
239		    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
240		    bp->b_bno);
241	bp->b_errs = 0;
242	bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
243	if (bp != &sblk)
244		return;
245	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
246		bwrite(fswritefd, (char *)sblock.fs_csp + i,
247		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
248		    sblock.fs_cssize - i < sblock.fs_bsize ?
249		    sblock.fs_cssize - i : sblock.fs_bsize);
250	}
251}
252
253void
254rwerror(char *mesg, ufs_daddr_t blk)
255{
256
257	if (bkgrdcheck)
258		exit(EEXIT);
259	if (preen == 0)
260		printf("\n");
261	pfatal("CANNOT %s: %ld", mesg, (long)blk);
262	if (reply("CONTINUE") == 0)
263		exit(EEXIT);
264}
265
266void
267ckfini(int markclean)
268{
269	struct bufarea *bp, *nbp;
270	int ofsmodified, cnt = 0;
271
272	if (bkgrdflag) {
273		unlink(snapname);
274		if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
275			cmd.value = FS_UNCLEAN;
276			cmd.size = markclean ? -1 : 1;
277			if (sysctlbyname("vfs.ffs.setflags", 0, 0,
278			    &cmd, sizeof cmd) == -1)
279				rwerror("SET FILESYSTEM FLAGS", FS_UNCLEAN);
280			if (!preen) {
281				printf("\n***** FILE SYSTEM MARKED %s *****\n",
282				    markclean ? "CLEAN" : "DIRTY");
283				if (!markclean)
284					rerun = 1;
285			}
286		} else if (!preen && !markclean) {
287			printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
288			rerun = 1;
289		}
290	}
291	if (fswritefd < 0) {
292		(void)close(fsreadfd);
293		return;
294	}
295	flush(fswritefd, &sblk);
296	if (havesb && sblk.b_bno != SBOFF / dev_bsize && cursnapshot == 0 &&
297	    !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
298		sblk.b_bno = SBOFF / dev_bsize;
299		sbdirty();
300		flush(fswritefd, &sblk);
301	}
302	flush(fswritefd, &cgblk);
303	free(cgblk.b_un.b_buf);
304	for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
305		cnt++;
306		flush(fswritefd, bp);
307		nbp = bp->b_prev;
308		free(bp->b_un.b_buf);
309		free((char *)bp);
310	}
311	if (bufhead.b_size != cnt)
312		errx(EEXIT, "panic: lost %d buffers", bufhead.b_size - cnt);
313	pbp = pdirbp = (struct bufarea *)0;
314	if (cursnapshot == 0 && sblock.fs_clean != markclean) {
315		if ((sblock.fs_clean = markclean) != 0)
316			sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
317		sbdirty();
318		ofsmodified = fsmodified;
319		flush(fswritefd, &sblk);
320		fsmodified = ofsmodified;
321		if (!preen) {
322			printf("\n***** FILE SYSTEM MARKED %s *****\n",
323			    markclean ? "CLEAN" : "DIRTY");
324			if (!markclean)
325				rerun = 1;
326		}
327	} else if (!preen && !markclean) {
328		printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
329		rerun = 1;
330	}
331	if (debug && totalreads > 0)
332		printf("cache missed %ld of %ld (%d%%)\n", diskreads,
333		    totalreads, (int)(diskreads * 100 / totalreads));
334	(void)close(fsreadfd);
335	(void)close(fswritefd);
336}
337
338int
339bread(int fd, char *buf, ufs_daddr_t blk, long size)
340{
341	char *cp;
342	int i, errs;
343	off_t offset;
344
345	offset = blk;
346	offset *= dev_bsize;
347	if (lseek(fd, offset, 0) < 0)
348		rwerror("SEEK BLK", blk);
349	else if (read(fd, buf, (int)size) == size)
350		return (0);
351	rwerror("READ BLK", blk);
352	if (lseek(fd, offset, 0) < 0)
353		rwerror("SEEK BLK", blk);
354	errs = 0;
355	memset(buf, 0, (size_t)size);
356	printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
357	for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
358		if (read(fd, cp, (int)secsize) != secsize) {
359			(void)lseek(fd, offset + i + secsize, 0);
360			if (secsize != dev_bsize && dev_bsize != 1)
361				printf(" %ld (%ld),",
362				    (blk * dev_bsize + i) / secsize,
363				    blk + i / dev_bsize);
364			else
365				printf(" %ld,", blk + i / dev_bsize);
366			errs++;
367		}
368	}
369	printf("\n");
370	if (errs)
371		resolved = 0;
372	return (errs);
373}
374
375void
376bwrite(int fd, char *buf, ufs_daddr_t blk, long size)
377{
378	int i;
379	char *cp;
380	off_t offset;
381
382	if (fd < 0)
383		return;
384	offset = blk;
385	offset *= dev_bsize;
386	if (lseek(fd, offset, 0) < 0)
387		rwerror("SEEK BLK", blk);
388	else if (write(fd, buf, (int)size) == size) {
389		fsmodified = 1;
390		return;
391	}
392	resolved = 0;
393	rwerror("WRITE BLK", blk);
394	if (lseek(fd, offset, 0) < 0)
395		rwerror("SEEK BLK", blk);
396	printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
397	for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
398		if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
399			(void)lseek(fd, offset + i + dev_bsize, 0);
400			printf(" %ld,", blk + i / dev_bsize);
401		}
402	printf("\n");
403	return;
404}
405
406/*
407 * allocate a data block with the specified number of fragments
408 */
409ufs_daddr_t
410allocblk(long frags)
411{
412	int i, j, k, cg, baseblk;
413	struct cg *cgp = &cgrp;
414
415	if (frags <= 0 || frags > sblock.fs_frag)
416		return (0);
417	for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
418		for (j = 0; j <= sblock.fs_frag - frags; j++) {
419			if (testbmap(i + j))
420				continue;
421			for (k = 1; k < frags; k++)
422				if (testbmap(i + j + k))
423					break;
424			if (k < frags) {
425				j += k;
426				continue;
427			}
428			cg = dtog(&sblock, i + j);
429			getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
430			if (!cg_chkmagic(cgp))
431				pfatal("CG %d: BAD MAGIC NUMBER\n", cg);
432			baseblk = dtogd(&sblock, i + j);
433			for (k = 0; k < frags; k++) {
434				setbmap(i + j + k);
435				clrbit(cg_blksfree(cgp), baseblk + k);
436			}
437			n_blks += frags;
438			if (frags == sblock.fs_frag)
439				cgp->cg_cs.cs_nbfree--;
440			else
441				cgp->cg_cs.cs_nffree -= frags;
442			cgdirty();
443			return (i + j);
444		}
445	}
446	return (0);
447}
448
449/*
450 * Free a previously allocated block
451 */
452void
453freeblk(ufs_daddr_t blkno, long frags)
454{
455	struct inodesc idesc;
456
457	idesc.id_blkno = blkno;
458	idesc.id_numfrags = frags;
459	(void)pass4check(&idesc);
460}
461
462/*
463 * Find a pathname
464 */
465void
466getpathname(char *namebuf, ino_t curdir, ino_t ino)
467{
468	int len;
469	char *cp;
470	struct inodesc idesc;
471	static int busy = 0;
472
473	if (curdir == ino && ino == ROOTINO) {
474		(void)strcpy(namebuf, "/");
475		return;
476	}
477	if (busy ||
478	    (inoinfo(curdir)->ino_state != DSTATE &&
479	     inoinfo(curdir)->ino_state != DFOUND)) {
480		(void)strcpy(namebuf, "?");
481		return;
482	}
483	busy = 1;
484	memset(&idesc, 0, sizeof(struct inodesc));
485	idesc.id_type = DATA;
486	idesc.id_fix = IGNORE;
487	cp = &namebuf[MAXPATHLEN - 1];
488	*cp = '\0';
489	if (curdir != ino) {
490		idesc.id_parent = curdir;
491		goto namelookup;
492	}
493	while (ino != ROOTINO) {
494		idesc.id_number = ino;
495		idesc.id_func = findino;
496		idesc.id_name = "..";
497		if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
498			break;
499	namelookup:
500		idesc.id_number = idesc.id_parent;
501		idesc.id_parent = ino;
502		idesc.id_func = findname;
503		idesc.id_name = namebuf;
504		if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
505			break;
506		len = strlen(namebuf);
507		cp -= len;
508		memmove(cp, namebuf, (size_t)len);
509		*--cp = '/';
510		if (cp < &namebuf[MAXNAMLEN])
511			break;
512		ino = idesc.id_number;
513	}
514	busy = 0;
515	if (ino != ROOTINO)
516		*--cp = '?';
517	memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
518}
519
520void
521catch(int sig)
522{
523
524	ckfini(0);
525	exit(12);
526}
527
528/*
529 * When preening, allow a single quit to signal
530 * a special exit after filesystem checks complete
531 * so that reboot sequence may be interrupted.
532 */
533void
534catchquit(int sig)
535{
536	printf("returning to single-user after filesystem check\n");
537	returntosingle = 1;
538	(void)signal(SIGQUIT, SIG_DFL);
539}
540
541/*
542 * determine whether an inode should be fixed.
543 */
544int
545dofix(struct inodesc *idesc, char *msg)
546{
547
548	switch (idesc->id_fix) {
549
550	case DONTKNOW:
551		if (idesc->id_type == DATA)
552			direrror(idesc->id_number, msg);
553		else
554			pwarn("%s", msg);
555		if (preen) {
556			printf(" (SALVAGED)\n");
557			idesc->id_fix = FIX;
558			return (ALTERED);
559		}
560		if (reply("SALVAGE") == 0) {
561			idesc->id_fix = NOFIX;
562			return (0);
563		}
564		idesc->id_fix = FIX;
565		return (ALTERED);
566
567	case FIX:
568		return (ALTERED);
569
570	case NOFIX:
571	case IGNORE:
572		return (0);
573
574	default:
575		errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
576	}
577	/* NOTREACHED */
578	return (0);
579}
580
581#include <stdarg.h>
582
583/*
584 * An unexpected inconsistency occured.
585 * Die if preening or filesystem is running with soft dependency protocol,
586 * otherwise just print message and continue.
587 */
588void
589pfatal(const char *fmt, ...)
590{
591	va_list ap;
592	va_start(ap, fmt);
593	if (!preen) {
594		(void)vfprintf(stdout, fmt, ap);
595		va_end(ap);
596		if (usedsoftdep)
597			(void)fprintf(stdout,
598			    "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
599		/*
600		 * Force foreground fsck to clean up inconsistency.
601		 */
602		if (bkgrdflag) {
603			cmd.value = FS_NEEDSFSCK;
604			cmd.size = 1;
605			if (sysctlbyname("vfs.ffs.setflags", 0, 0,
606			    &cmd, sizeof cmd) == -1)
607				pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
608			fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
609			ckfini(0);
610			exit(EEXIT);
611		}
612		return;
613	}
614	if (cdevname == NULL)
615		cdevname = "fsck";
616	(void)fprintf(stdout, "%s: ", cdevname);
617	(void)vfprintf(stdout, fmt, ap);
618	(void)fprintf(stdout,
619	    "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
620	    cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
621	/*
622	 * Force foreground fsck to clean up inconsistency.
623	 */
624	if (bkgrdflag) {
625		cmd.value = FS_NEEDSFSCK;
626		cmd.size = 1;
627		if (sysctlbyname("vfs.ffs.setflags", 0, 0,
628		    &cmd, sizeof cmd) == -1)
629			pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
630	}
631	ckfini(0);
632	exit(EEXIT);
633}
634
635/*
636 * Pwarn just prints a message when not preening or running soft dependency
637 * protocol, or a warning (preceded by filename) when preening.
638 */
639void
640pwarn(const char *fmt, ...)
641{
642	va_list ap;
643	va_start(ap, fmt);
644	if (preen)
645		(void)fprintf(stdout, "%s: ", cdevname);
646	(void)vfprintf(stdout, fmt, ap);
647	va_end(ap);
648}
649
650/*
651 * Stub for routines from kernel.
652 */
653void
654panic(const char *fmt, ...)
655{
656	va_list ap;
657	va_start(ap, fmt);
658	pfatal("INTERNAL INCONSISTENCY:");
659	(void)vfprintf(stdout, fmt, ap);
660	va_end(ap);
661	exit(EEXIT);
662}
663