fsutil.c revision 102231 
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 102231 2002-08-21 18:11:48Z trhodes $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/types.h>
44#include <sys/sysctl.h>
45#include <sys/disklabel.h>
46#include <sys/stat.h>
47#include <sys/disklabel.h>
48
49#include <ufs/ufs/dinode.h>
50#include <ufs/ufs/dir.h>
51#include <ufs/ffs/fs.h>
52
53#include <err.h>
54#include <errno.h>
55#include <string.h>
56#include <ctype.h>
57#include <fstab.h>
58#include <stdint.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <unistd.h>
62
63#include "fsck.h"
64
65long	diskreads, totalreads;	/* Disk cache statistics */
66
67int
68ftypeok(union dinode *dp)
69{
70	switch (DIP(dp, di_mode) & IFMT) {
71
72	case IFDIR:
73	case IFREG:
74	case IFBLK:
75	case IFCHR:
76	case IFLNK:
77	case IFSOCK:
78	case IFIFO:
79		return (1);
80
81	default:
82		if (debug)
83			printf("bad file type 0%o\n", DIP(dp, di_mode));
84		return (0);
85	}
86}
87
88int
89reply(const 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 && bkgrdflag == 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(ino_t inum)
130{
131	static struct inostat unallocated = { USTATE, 0, 0 };
132	struct inostatlist *ilp;
133	int iloff;
134
135	if (inum > maxino)
136		errx(EEXIT, "inoinfo: inumber %d out of range", inum);
137	ilp = &inostathead[inum / sblock.fs_ipg];
138	iloff = inum % sblock.fs_ipg;
139	if (iloff >= ilp->il_numalloced)
140		return (&unallocated);
141	return (&ilp->il_stat[iloff]);
142}
143
144/*
145 * Malloc buffers and set up cache.
146 */
147void
148bufinit(void)
149{
150	struct bufarea *bp;
151	long bufcnt, i;
152	char *bufp;
153
154	pbp = pdirbp = (struct bufarea *)0;
155	bufp = malloc((unsigned int)sblock.fs_bsize);
156	if (bufp == 0)
157		errx(EEXIT, "cannot allocate buffer pool");
158	cgblk.b_un.b_buf = bufp;
159	initbarea(&cgblk);
160	bufhead.b_next = bufhead.b_prev = &bufhead;
161	bufcnt = MAXBUFSPACE / sblock.fs_bsize;
162	if (bufcnt < MINBUFS)
163		bufcnt = MINBUFS;
164	for (i = 0; i < bufcnt; i++) {
165		bp = (struct bufarea *)malloc(sizeof(struct bufarea));
166		bufp = malloc((unsigned int)sblock.fs_bsize);
167		if (bp == NULL || bufp == NULL) {
168			if (i >= MINBUFS)
169				break;
170			errx(EEXIT, "cannot allocate buffer pool");
171		}
172		bp->b_un.b_buf = bufp;
173		bp->b_prev = &bufhead;
174		bp->b_next = bufhead.b_next;
175		bufhead.b_next->b_prev = bp;
176		bufhead.b_next = bp;
177		initbarea(bp);
178	}
179	bufhead.b_size = i;	/* save number of buffers */
180}
181
182/*
183 * Manage a cache of directory blocks.
184 */
185struct bufarea *
186getdatablk(ufs2_daddr_t blkno, long size)
187{
188	struct bufarea *bp;
189
190	for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
191		if (bp->b_bno == fsbtodb(&sblock, blkno))
192			goto foundit;
193	for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
194		if ((bp->b_flags & B_INUSE) == 0)
195			break;
196	if (bp == &bufhead)
197		errx(EEXIT, "deadlocked buffer pool");
198	getblk(bp, blkno, size);
199	/* fall through */
200foundit:
201	bp->b_prev->b_next = bp->b_next;
202	bp->b_next->b_prev = bp->b_prev;
203	bp->b_prev = &bufhead;
204	bp->b_next = bufhead.b_next;
205	bufhead.b_next->b_prev = bp;
206	bufhead.b_next = bp;
207	bp->b_flags |= B_INUSE;
208	return (bp);
209}
210
211void
212getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
213{
214	ufs2_daddr_t dblk;
215
216	totalreads++;
217	dblk = fsbtodb(&sblock, blk);
218	if (bp->b_bno != dblk) {
219		flush(fswritefd, bp);
220		diskreads++;
221		bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size);
222		bp->b_bno = dblk;
223		bp->b_size = size;
224	}
225}
226
227void
228flush(int fd, struct bufarea *bp)
229{
230	int i, j;
231
232	if (!bp->b_dirty)
233		return;
234	bp->b_dirty = 0;
235	if (fswritefd < 0) {
236		pfatal("WRITING IN READ_ONLY MODE.\n");
237		return;
238	}
239	if (bp->b_errs != 0)
240		pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
241		    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
242		    (long long)bp->b_bno);
243	bp->b_errs = 0;
244	bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
245	if (bp != &sblk)
246		return;
247	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
248		bwrite(fswritefd, (char *)sblock.fs_csp + i,
249		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
250		    sblock.fs_cssize - i < sblock.fs_bsize ?
251		    sblock.fs_cssize - i : sblock.fs_bsize);
252	}
253}
254
255void
256rwerror(const char *mesg, ufs2_daddr_t blk)
257{
258
259	if (bkgrdcheck)
260		exit(EEXIT);
261	if (preen == 0)
262		printf("\n");
263	pfatal("CANNOT %s: %ld", mesg, (long)blk);
264	if (reply("CONTINUE") == 0)
265		exit(EEXIT);
266}
267
268void
269ckfini(int markclean)
270{
271	struct bufarea *bp, *nbp;
272	int ofsmodified, cnt = 0;
273
274	if (bkgrdflag) {
275		unlink(snapname);
276		if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
277			cmd.value = FS_UNCLEAN;
278			cmd.size = markclean ? -1 : 1;
279			if (sysctlbyname("vfs.ffs.setflags", 0, 0,
280			    &cmd, sizeof cmd) == -1)
281				rwerror("SET FILESYSTEM FLAGS", FS_UNCLEAN);
282			if (!preen) {
283				printf("\n***** FILE SYSTEM MARKED %s *****\n",
284				    markclean ? "CLEAN" : "DIRTY");
285				if (!markclean)
286					rerun = 1;
287			}
288		} else if (!preen && !markclean) {
289			printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
290			rerun = 1;
291		}
292	}
293	if (fswritefd < 0) {
294		(void)close(fsreadfd);
295		return;
296	}
297	flush(fswritefd, &sblk);
298	if (havesb && cursnapshot == 0 && sblock.fs_magic == FS_UFS2_MAGIC &&
299	    sblk.b_bno != fsbtodb(&sblock, sblock.fs_sblockloc) &&
300	    !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
301		sblk.b_bno = fsbtodb(&sblock, sblock.fs_sblockloc);
302		sbdirty();
303		flush(fswritefd, &sblk);
304	}
305	flush(fswritefd, &cgblk);
306	free(cgblk.b_un.b_buf);
307	for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
308		cnt++;
309		flush(fswritefd, bp);
310		nbp = bp->b_prev;
311		free(bp->b_un.b_buf);
312		free((char *)bp);
313	}
314	if (bufhead.b_size != cnt)
315		errx(EEXIT, "panic: lost %d buffers", bufhead.b_size - cnt);
316	pbp = pdirbp = (struct bufarea *)0;
317	if (cursnapshot == 0 && sblock.fs_clean != markclean) {
318		if ((sblock.fs_clean = markclean) != 0)
319			sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
320		sbdirty();
321		ofsmodified = fsmodified;
322		flush(fswritefd, &sblk);
323		fsmodified = ofsmodified;
324		if (!preen) {
325			printf("\n***** FILE SYSTEM MARKED %s *****\n",
326			    markclean ? "CLEAN" : "DIRTY");
327			if (!markclean)
328				rerun = 1;
329		}
330	} else if (!preen && !markclean) {
331		printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
332		rerun = 1;
333	}
334	if (debug && totalreads > 0)
335		printf("cache missed %ld of %ld (%d%%)\n", diskreads,
336		    totalreads, (int)(diskreads * 100 / totalreads));
337	(void)close(fsreadfd);
338	(void)close(fswritefd);
339}
340
341int
342bread(int fd, char *buf, ufs2_daddr_t blk, long size)
343{
344	char *cp;
345	int i, errs;
346	off_t offset;
347
348	offset = blk;
349	offset *= dev_bsize;
350	if (lseek(fd, offset, 0) < 0)
351		rwerror("SEEK BLK", blk);
352	else if (read(fd, buf, (int)size) == size)
353		return (0);
354	rwerror("READ BLK", blk);
355	if (lseek(fd, offset, 0) < 0)
356		rwerror("SEEK BLK", blk);
357	errs = 0;
358	memset(buf, 0, (size_t)size);
359	printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
360	for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
361		if (read(fd, cp, (int)secsize) != secsize) {
362			(void)lseek(fd, offset + i + secsize, 0);
363			if (secsize != dev_bsize && dev_bsize != 1)
364				printf(" %jd (%jd),",
365				    (intmax_t)(blk * dev_bsize + i) / secsize,
366				    (intmax_t)blk + i / dev_bsize);
367			else
368				printf(" %jd,", (intmax_t)blk + i / dev_bsize);
369			errs++;
370		}
371	}
372	printf("\n");
373	if (errs)
374		resolved = 0;
375	return (errs);
376}
377
378void
379bwrite(int fd, char *buf, ufs2_daddr_t blk, long size)
380{
381	int i;
382	char *cp;
383	off_t offset;
384
385	if (fd < 0)
386		return;
387	offset = blk;
388	offset *= dev_bsize;
389	if (lseek(fd, offset, 0) < 0)
390		rwerror("SEEK BLK", blk);
391	else if (write(fd, buf, (int)size) == size) {
392		fsmodified = 1;
393		return;
394	}
395	resolved = 0;
396	rwerror("WRITE BLK", blk);
397	if (lseek(fd, offset, 0) < 0)
398		rwerror("SEEK BLK", blk);
399	printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
400	for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
401		if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
402			(void)lseek(fd, offset + i + dev_bsize, 0);
403			printf(" %jd,", (intmax_t)blk + i / dev_bsize);
404		}
405	printf("\n");
406	return;
407}
408
409/*
410 * allocate a data block with the specified number of fragments
411 */
412ufs2_daddr_t
413allocblk(long frags)
414{
415	int i, j, k, cg, baseblk;
416	struct cg *cgp = &cgrp;
417
418	if (frags <= 0 || frags > sblock.fs_frag)
419		return (0);
420	for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
421		for (j = 0; j <= sblock.fs_frag - frags; j++) {
422			if (testbmap(i + j))
423				continue;
424			for (k = 1; k < frags; k++)
425				if (testbmap(i + j + k))
426					break;
427			if (k < frags) {
428				j += k;
429				continue;
430			}
431			cg = dtog(&sblock, i + j);
432			getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
433			if (!cg_chkmagic(cgp))
434				pfatal("CG %d: BAD MAGIC NUMBER\n", cg);
435			baseblk = dtogd(&sblock, i + j);
436			for (k = 0; k < frags; k++) {
437				setbmap(i + j + k);
438				clrbit(cg_blksfree(cgp), baseblk + k);
439			}
440			n_blks += frags;
441			if (frags == sblock.fs_frag)
442				cgp->cg_cs.cs_nbfree--;
443			else
444				cgp->cg_cs.cs_nffree -= frags;
445			cgdirty();
446			return (i + j);
447		}
448	}
449	return (0);
450}
451
452/*
453 * Free a previously allocated block
454 */
455void
456freeblk(ufs2_daddr_t blkno, long frags)
457{
458	struct inodesc idesc;
459
460	idesc.id_blkno = blkno;
461	idesc.id_numfrags = frags;
462	(void)pass4check(&idesc);
463}
464
465/*
466 * Find a pathname
467 */
468void
469getpathname(char *namebuf, ino_t curdir, ino_t ino)
470{
471	int len;
472	char *cp;
473	struct inodesc idesc;
474	static int busy = 0;
475
476	if (curdir == ino && ino == ROOTINO) {
477		(void)strcpy(namebuf, "/");
478		return;
479	}
480	if (busy ||
481	    (inoinfo(curdir)->ino_state != DSTATE &&
482	     inoinfo(curdir)->ino_state != DFOUND)) {
483		(void)strcpy(namebuf, "?");
484		return;
485	}
486	busy = 1;
487	memset(&idesc, 0, sizeof(struct inodesc));
488	idesc.id_type = DATA;
489	idesc.id_fix = IGNORE;
490	cp = &namebuf[MAXPATHLEN - 1];
491	*cp = '\0';
492	if (curdir != ino) {
493		idesc.id_parent = curdir;
494		goto namelookup;
495	}
496	while (ino != ROOTINO) {
497		idesc.id_number = ino;
498		idesc.id_func = findino;
499		idesc.id_name = strdup("..");
500		if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
501			break;
502	namelookup:
503		idesc.id_number = idesc.id_parent;
504		idesc.id_parent = ino;
505		idesc.id_func = findname;
506		idesc.id_name = namebuf;
507		if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
508			break;
509		len = strlen(namebuf);
510		cp -= len;
511		memmove(cp, namebuf, (size_t)len);
512		*--cp = '/';
513		if (cp < &namebuf[MAXNAMLEN])
514			break;
515		ino = idesc.id_number;
516	}
517	busy = 0;
518	if (ino != ROOTINO)
519		*--cp = '?';
520	memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
521}
522
523void
524catch(int sig __unused)
525{
526
527	ckfini(0);
528	exit(12);
529}
530
531/*
532 * When preening, allow a single quit to signal
533 * a special exit after file system checks complete
534 * so that reboot sequence may be interrupted.
535 */
536void
537catchquit(int sig __unused)
538{
539	printf("returning to single-user after file system check\n");
540	returntosingle = 1;
541	(void)signal(SIGQUIT, SIG_DFL);
542}
543
544/*
545 * determine whether an inode should be fixed.
546 */
547int
548dofix(struct inodesc *idesc, const char *msg)
549{
550
551	switch (idesc->id_fix) {
552
553	case DONTKNOW:
554		if (idesc->id_type == DATA)
555			direrror(idesc->id_number, msg);
556		else
557			pwarn("%s", msg);
558		if (preen) {
559			printf(" (SALVAGED)\n");
560			idesc->id_fix = FIX;
561			return (ALTERED);
562		}
563		if (reply("SALVAGE") == 0) {
564			idesc->id_fix = NOFIX;
565			return (0);
566		}
567		idesc->id_fix = FIX;
568		return (ALTERED);
569
570	case FIX:
571		return (ALTERED);
572
573	case NOFIX:
574	case IGNORE:
575		return (0);
576
577	default:
578		errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
579	}
580	/* NOTREACHED */
581	return (0);
582}
583
584#include <stdarg.h>
585
586/*
587 * An unexpected inconsistency occured.
588 * Die if preening or file system is running with soft dependency protocol,
589 * otherwise just print message and continue.
590 */
591void
592pfatal(const char *fmt, ...)
593{
594	va_list ap;
595	va_start(ap, fmt);
596	if (!preen) {
597		(void)vfprintf(stdout, fmt, ap);
598		va_end(ap);
599		if (usedsoftdep)
600			(void)fprintf(stdout,
601			    "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
602		/*
603		 * Force foreground fsck to clean up inconsistency.
604		 */
605		if (bkgrdflag) {
606			cmd.value = FS_NEEDSFSCK;
607			cmd.size = 1;
608			if (sysctlbyname("vfs.ffs.setflags", 0, 0,
609			    &cmd, sizeof cmd) == -1)
610				pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
611			fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
612			ckfini(0);
613			exit(EEXIT);
614		}
615		return;
616	}
617	if (cdevname == NULL)
618		cdevname = strdup("fsck");
619	(void)fprintf(stdout, "%s: ", cdevname);
620	(void)vfprintf(stdout, fmt, ap);
621	(void)fprintf(stdout,
622	    "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
623	    cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
624	/*
625	 * Force foreground fsck to clean up inconsistency.
626	 */
627	if (bkgrdflag) {
628		cmd.value = FS_NEEDSFSCK;
629		cmd.size = 1;
630		if (sysctlbyname("vfs.ffs.setflags", 0, 0,
631		    &cmd, sizeof cmd) == -1)
632			pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
633	}
634	ckfini(0);
635	exit(EEXIT);
636}
637
638/*
639 * Pwarn just prints a message when not preening or running soft dependency
640 * protocol, or a warning (preceded by filename) when preening.
641 */
642void
643pwarn(const char *fmt, ...)
644{
645	va_list ap;
646	va_start(ap, fmt);
647	if (preen)
648		(void)fprintf(stdout, "%s: ", cdevname);
649	(void)vfprintf(stdout, fmt, ap);
650	va_end(ap);
651}
652
653/*
654 * Stub for routines from kernel.
655 */
656void
657panic(const char *fmt, ...)
658{
659	va_list ap;
660	va_start(ap, fmt);
661	pfatal("INTERNAL INCONSISTENCY:");
662	(void)vfprintf(stdout, fmt, ap);
663	va_end(ap);
664	exit(EEXIT);
665}
666