fsutil.c revision 66864 
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 66864 2000-10-09 09:21:04Z adrian $"
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/types.h>
44#include <sys/stat.h>
45
46#include <ufs/ufs/dinode.h>
47#include <ufs/ufs/dir.h>
48#include <ufs/ffs/fs.h>
49
50#include <err.h>
51#include <errno.h>
52#include <string.h>
53#include <ctype.h>
54#include <fstab.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <unistd.h>
58
59#include "fsck.h"
60
61long	diskreads, totalreads;	/* Disk cache statistics */
62
63static void rwerror __P((char *mesg, ufs_daddr_t blk));
64
65int
66ftypeok(dp)
67	struct dinode *dp;
68{
69	switch (dp->di_mode & IFMT) {
70
71	case IFDIR:
72	case IFREG:
73	case IFBLK:
74	case IFCHR:
75	case IFLNK:
76	case IFSOCK:
77	case IFIFO:
78		return (1);
79
80	default:
81		if (debug)
82			printf("bad file type 0%o\n", dp->di_mode);
83		return (0);
84	}
85}
86
87int
88reply(question)
89	char *question;
90{
91	int persevere;
92	char c;
93
94	if (preen)
95		pfatal("INTERNAL ERROR: GOT TO reply()");
96	persevere = !strcmp(question, "CONTINUE");
97	printf("\n");
98	if (!persevere && (nflag || fswritefd < 0)) {
99		printf("%s? no\n\n", question);
100		resolved = 0;
101		return (0);
102	}
103	if (yflag || (persevere && nflag)) {
104		printf("%s? yes\n\n", question);
105		return (1);
106	}
107	do	{
108		printf("%s? [yn] ", question);
109		(void) fflush(stdout);
110		c = getc(stdin);
111		while (c != '\n' && getc(stdin) != '\n') {
112			if (feof(stdin)) {
113				resolved = 0;
114				return (0);
115			}
116		}
117	} while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
118	printf("\n");
119	if (c == 'y' || c == 'Y')
120		return (1);
121	resolved = 0;
122	return (0);
123}
124
125/*
126 * Look up state information for an inode.
127 */
128struct inostat *
129inoinfo(inum)
130	ino_t inum;
131{
132	static struct inostat unallocated = { USTATE, 0, 0 };
133	struct inostatlist *ilp;
134	int iloff;
135
136	if (inum > maxino)
137		errx(EEXIT, "inoinfo: inumber %d out of range", inum);
138	ilp = &inostathead[inum / sblock.fs_ipg];
139	iloff = inum % sblock.fs_ipg;
140	if (iloff >= ilp->il_numalloced)
141		return (&unallocated);
142	return (&ilp->il_stat[iloff]);
143}
144
145/*
146 * Malloc buffers and set up cache.
147 */
148void
149bufinit()
150{
151	register struct bufarea *bp;
152	long bufcnt, i;
153	char *bufp;
154
155	pbp = pdirbp = (struct bufarea *)0;
156	bufp = malloc((unsigned int)sblock.fs_bsize);
157	if (bufp == 0)
158		errx(EEXIT, "cannot allocate buffer pool");
159	cgblk.b_un.b_buf = bufp;
160	initbarea(&cgblk);
161	bufhead.b_next = bufhead.b_prev = &bufhead;
162	bufcnt = MAXBUFSPACE / sblock.fs_bsize;
163	if (bufcnt < MINBUFS)
164		bufcnt = MINBUFS;
165	for (i = 0; i < bufcnt; i++) {
166		bp = (struct bufarea *)malloc(sizeof(struct bufarea));
167		bufp = malloc((unsigned int)sblock.fs_bsize);
168		if (bp == NULL || bufp == NULL) {
169			if (i >= MINBUFS)
170				break;
171			errx(EEXIT, "cannot allocate buffer pool");
172		}
173		bp->b_un.b_buf = bufp;
174		bp->b_prev = &bufhead;
175		bp->b_next = bufhead.b_next;
176		bufhead.b_next->b_prev = bp;
177		bufhead.b_next = bp;
178		initbarea(bp);
179	}
180	bufhead.b_size = i;	/* save number of buffers */
181}
182
183/*
184 * Manage a cache of directory blocks.
185 */
186struct bufarea *
187getdatablk(blkno, size)
188	ufs_daddr_t blkno;
189	long size;
190{
191	register struct bufarea *bp;
192
193	for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
194		if (bp->b_bno == fsbtodb(&sblock, blkno))
195			goto foundit;
196	for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
197		if ((bp->b_flags & B_INUSE) == 0)
198			break;
199	if (bp == &bufhead)
200		errx(EEXIT, "deadlocked buffer pool");
201	getblk(bp, blkno, size);
202	/* fall through */
203foundit:
204	totalreads++;
205	bp->b_prev->b_next = bp->b_next;
206	bp->b_next->b_prev = bp->b_prev;
207	bp->b_prev = &bufhead;
208	bp->b_next = bufhead.b_next;
209	bufhead.b_next->b_prev = bp;
210	bufhead.b_next = bp;
211	bp->b_flags |= B_INUSE;
212	return (bp);
213}
214
215void
216getblk(bp, blk, size)
217	register struct bufarea *bp;
218	ufs_daddr_t blk;
219	long size;
220{
221	ufs_daddr_t dblk;
222
223	dblk = fsbtodb(&sblock, blk);
224	if (bp->b_bno != dblk) {
225		flush(fswritefd, bp);
226		diskreads++;
227		bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size);
228		bp->b_bno = dblk;
229		bp->b_size = size;
230	}
231}
232
233void
234flush(fd, bp)
235	int fd;
236	register struct bufarea *bp;
237{
238	register int i, j;
239
240	if (!bp->b_dirty)
241		return;
242	if (bp->b_errs != 0)
243		pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n",
244		    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
245		    bp->b_bno);
246	bp->b_dirty = 0;
247	bp->b_errs = 0;
248	bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
249	if (bp != &sblk)
250		return;
251	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
252		bwrite(fswritefd, (char *)sblock.fs_csp[j],
253		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
254		    sblock.fs_cssize - i < sblock.fs_bsize ?
255		    sblock.fs_cssize - i : sblock.fs_bsize);
256	}
257}
258
259static void
260rwerror(mesg, blk)
261	char *mesg;
262	ufs_daddr_t blk;
263{
264
265	if (preen == 0)
266		printf("\n");
267	pfatal("CANNOT %s: BLK %ld", mesg, blk);
268	if (reply("CONTINUE") == 0)
269		exit(EEXIT);
270}
271
272void
273ckfini(markclean)
274	int markclean;
275{
276	register struct bufarea *bp, *nbp;
277	int ofsmodified, cnt = 0;
278
279	if (fswritefd < 0) {
280		(void)close(fsreadfd);
281		return;
282	}
283	flush(fswritefd, &sblk);
284	if (havesb && sblk.b_bno != SBOFF / dev_bsize &&
285	    !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
286		sblk.b_bno = SBOFF / dev_bsize;
287		sbdirty();
288		flush(fswritefd, &sblk);
289	}
290	flush(fswritefd, &cgblk);
291	free(cgblk.b_un.b_buf);
292	for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
293		cnt++;
294		flush(fswritefd, bp);
295		nbp = bp->b_prev;
296		free(bp->b_un.b_buf);
297		free((char *)bp);
298	}
299	if (bufhead.b_size != cnt)
300		errx(EEXIT, "panic: lost %d buffers", bufhead.b_size - cnt);
301	pbp = pdirbp = (struct bufarea *)0;
302	if (sblock.fs_clean != markclean) {
303		sblock.fs_clean = markclean;
304		sbdirty();
305		ofsmodified = fsmodified;
306		flush(fswritefd, &sblk);
307		fsmodified = ofsmodified;
308		if (!preen) {
309			printf("\n***** FILE SYSTEM MARKED %s *****\n",
310			    markclean ? "CLEAN" : "DIRTY");
311			if (!markclean)
312				rerun = 1;
313		}
314	} else if (!preen && !markclean) {
315		printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
316		rerun = 1;
317	}
318	if (debug)
319		printf("cache missed %ld of %ld (%d%%)\n", diskreads,
320		    totalreads, (int)(diskreads * 100 / totalreads));
321	(void)close(fsreadfd);
322	(void)close(fswritefd);
323}
324
325int
326bread(fd, buf, blk, size)
327	int fd;
328	char *buf;
329	ufs_daddr_t blk;
330	long size;
331{
332	char *cp;
333	int i, errs;
334	off_t offset;
335
336	offset = blk;
337	offset *= dev_bsize;
338	if (lseek(fd, offset, 0) < 0)
339		rwerror("SEEK", blk);
340	else if (read(fd, buf, (int)size) == size)
341		return (0);
342	rwerror("READ", blk);
343	if (lseek(fd, offset, 0) < 0)
344		rwerror("SEEK", blk);
345	errs = 0;
346	memset(buf, 0, (size_t)size);
347	printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
348	for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
349		if (read(fd, cp, (int)secsize) != secsize) {
350			(void)lseek(fd, offset + i + secsize, 0);
351			if (secsize != dev_bsize && dev_bsize != 1)
352				printf(" %ld (%ld),",
353				    (blk * dev_bsize + i) / secsize,
354				    blk + i / dev_bsize);
355			else
356				printf(" %ld,", blk + i / dev_bsize);
357			errs++;
358		}
359	}
360	printf("\n");
361	if (errs)
362		resolved = 0;
363	return (errs);
364}
365
366void
367bwrite(fd, buf, blk, size)
368	int fd;
369	char *buf;
370	ufs_daddr_t blk;
371	long size;
372{
373	int i;
374	char *cp;
375	off_t offset;
376
377	if (fd < 0)
378		return;
379	offset = blk;
380	offset *= dev_bsize;
381	if (lseek(fd, offset, 0) < 0)
382		rwerror("SEEK", blk);
383	else if (write(fd, buf, (int)size) == size) {
384		fsmodified = 1;
385		return;
386	}
387	resolved = 0;
388	rwerror("WRITE", blk);
389	if (lseek(fd, offset, 0) < 0)
390		rwerror("SEEK", blk);
391	printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
392	for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
393		if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
394			(void)lseek(fd, offset + i + dev_bsize, 0);
395			printf(" %ld,", blk + i / dev_bsize);
396		}
397	printf("\n");
398	return;
399}
400
401/*
402 * allocate a data block with the specified number of fragments
403 */
404ufs_daddr_t
405allocblk(frags)
406	long frags;
407{
408	int i, j, k, cg, baseblk;
409	struct cg *cgp = &cgrp;
410
411	if (frags <= 0 || frags > sblock.fs_frag)
412		return (0);
413	for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
414		for (j = 0; j <= sblock.fs_frag - frags; j++) {
415			if (testbmap(i + j))
416				continue;
417			for (k = 1; k < frags; k++)
418				if (testbmap(i + j + k))
419					break;
420			if (k < frags) {
421				j += k;
422				continue;
423			}
424			cg = dtog(&sblock, i + j);
425			getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
426			if (!cg_chkmagic(cgp))
427				pfatal("CG %d: BAD MAGIC NUMBER\n", cg);
428			baseblk = dtogd(&sblock, i + j);
429			for (k = 0; k < frags; k++) {
430				setbmap(i + j + k);
431				clrbit(cg_blksfree(cgp), baseblk + k);
432			}
433			n_blks += frags;
434			if (frags == sblock.fs_frag)
435				cgp->cg_cs.cs_nbfree--;
436			else
437				cgp->cg_cs.cs_nffree -= frags;
438			cgdirty();
439			return (i + j);
440		}
441	}
442	return (0);
443}
444
445/*
446 * Free a previously allocated block
447 */
448void
449freeblk(blkno, frags)
450	ufs_daddr_t blkno;
451	long frags;
452{
453	struct inodesc idesc;
454
455	idesc.id_blkno = blkno;
456	idesc.id_numfrags = frags;
457	(void)pass4check(&idesc);
458}
459
460/*
461 * Find a pathname
462 */
463void
464getpathname(namebuf, curdir, ino)
465	char *namebuf;
466	ino_t curdir, ino;
467{
468	int len;
469	register 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(sig)
522	int sig;
523{
524	if (!doinglevel2)
525		ckfini(0);
526	exit(12);
527}
528
529/*
530 * When preening, allow a single quit to signal
531 * a special exit after filesystem checks complete
532 * so that reboot sequence may be interrupted.
533 */
534void
535catchquit(sig)
536	int sig;
537{
538	printf("returning to single-user after filesystem check\n");
539	returntosingle = 1;
540	(void)signal(SIGQUIT, SIG_DFL);
541}
542
543/*
544 * Ignore a single quit signal; wait and flush just in case.
545 * Used by child processes in preen.
546 */
547void
548voidquit(sig)
549	int sig;
550{
551
552	sleep(1);
553	(void)signal(SIGQUIT, SIG_IGN);
554	(void)signal(SIGQUIT, SIG_DFL);
555}
556
557/*
558 * determine whether an inode should be fixed.
559 */
560int
561dofix(idesc, msg)
562	register struct inodesc *idesc;
563	char *msg;
564{
565
566	switch (idesc->id_fix) {
567
568	case DONTKNOW:
569		if (idesc->id_type == DATA)
570			direrror(idesc->id_number, msg);
571		else
572			pwarn(msg);
573		if (preen) {
574			printf(" (SALVAGED)\n");
575			idesc->id_fix = FIX;
576			return (ALTERED);
577		}
578		if (reply("SALVAGE") == 0) {
579			idesc->id_fix = NOFIX;
580			return (0);
581		}
582		idesc->id_fix = FIX;
583		return (ALTERED);
584
585	case FIX:
586		return (ALTERED);
587
588	case NOFIX:
589	case IGNORE:
590		return (0);
591
592	default:
593		errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
594	}
595	/* NOTREACHED */
596	return (0);
597}
598
599#if __STDC__
600#include <stdarg.h>
601#else
602#include <varargs.h>
603#endif
604
605/*
606 * An unexpected inconsistency occured.
607 * Die if preening or filesystem is running with soft dependency protocol,
608 * otherwise just print message and continue.
609 */
610void
611#if __STDC__
612pfatal(const char *fmt, ...)
613#else
614pfatal(fmt, va_alist)
615	char *fmt;
616	va_dcl
617#endif
618{
619	va_list ap;
620#if __STDC__
621	va_start(ap, fmt);
622#else
623	va_start(ap);
624#endif
625	if (!preen) {
626		(void)vfprintf(stderr, fmt, ap);
627		va_end(ap);
628		if (usedsoftdep)
629			(void)fprintf(stderr,
630			    "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
631		return;
632	}
633	if (cdevname == NULL)
634		cdevname = "fsck";
635	(void)fprintf(stderr, "%s: ", cdevname);
636	(void)vfprintf(stderr, fmt, ap);
637	(void)fprintf(stderr,
638	    "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
639	    cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
640	ckfini(0);
641	exit(EEXIT);
642}
643
644/*
645 * Pwarn just prints a message when not preening or running soft dependency
646 * protocol, or a warning (preceded by filename) when preening.
647 */
648void
649#if __STDC__
650pwarn(const char *fmt, ...)
651#else
652pwarn(fmt, va_alist)
653	char *fmt;
654	va_dcl
655#endif
656{
657	va_list ap;
658#if __STDC__
659	va_start(ap, fmt);
660#else
661	va_start(ap);
662#endif
663	if (preen)
664		(void)fprintf(stderr, "%s: ", cdevname);
665	(void)vfprintf(stderr, fmt, ap);
666	va_end(ap);
667}
668
669/*
670 * Stub for routines from kernel.
671 */
672void
673#if __STDC__
674panic(const char *fmt, ...)
675#else
676panic(fmt, va_alist)
677	char *fmt;
678	va_dcl
679#endif
680{
681	va_list ap;
682#if __STDC__
683	va_start(ap, fmt);
684#else
685	va_start(ap);
686#endif
687	pfatal("INTERNAL INCONSISTENCY:");
688	(void)vfprintf(stderr, fmt, ap);
689	va_end(ap);
690	exit(EEXIT);
691}
692