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utilities.c revision 1.6 
      1 /*
      2  * Copyright (c) 1980, 1986 The Regents of the University of California.
      3  * 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 /*static char sccsid[] = "from: @(#)utilities.c	5.30 (Berkeley) 7/26/91";*/
     36 static char rcsid[] = "$Id: utilities.c,v 1.6 1994/04/09 08:53:37 deraadt Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/param.h>
     40 #include <ufs/dinode.h>
     41 #include <ufs/fs.h>
     42 #include <ufs/dir.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <ctype.h>
     47 #include "fsck.h"
     48 
     49 long	diskreads, totalreads;	/* Disk cache statistics */
     50 
     51 ftypeok(dp)
     52 	struct dinode *dp;
     53 {
     54 	switch (dp->di_mode & IFMT) {
     55 
     56 	case IFDIR:
     57 	case IFREG:
     58 	case IFBLK:
     59 	case IFCHR:
     60 	case IFLNK:
     61 	case IFSOCK:
     62 	case IFIFO:
     63 		return (1);
     64 
     65 	default:
     66 		if (debug)
     67 			printf("bad file type 0%o\n", dp->di_mode);
     68 		return (0);
     69 	}
     70 }
     71 
     72 reply(question)
     73 	char *question;
     74 {
     75 	int persevere;
     76 	char c;
     77 
     78 	if (preen)
     79 		pfatal("INTERNAL ERROR: GOT TO reply()");
     80 	persevere = !strcmp(question, "CONTINUE");
     81 	printf("\n");
     82 	if (!persevere && (nflag || fswritefd < 0)) {
     83 		printf("%s? no\n\n", question);
     84 		return (0);
     85 	}
     86 	if (yflag || (persevere && nflag)) {
     87 		printf("%s? yes\n\n", question);
     88 		return (1);
     89 	}
     90 	do	{
     91 		printf("%s? [yn] ", question);
     92 		(void) fflush(stdout);
     93 		c = getc(stdin);
     94 		while (c != '\n' && getc(stdin) != '\n')
     95 			if (feof(stdin))
     96 				return (0);
     97 	} while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
     98 	printf("\n");
     99 	if (c == 'y' || c == 'Y')
    100 		return (1);
    101 	return (0);
    102 }
    103 
    104 /*
    105  * Malloc buffers and set up cache.
    106  */
    107 bufinit()
    108 {
    109 	register struct bufarea *bp;
    110 	long bufcnt, i;
    111 	char *bufp;
    112 
    113 	pbp = pdirbp = (struct bufarea *)0;
    114 	bufp = malloc((unsigned int)sblock.fs_bsize);
    115 	if (bufp == 0)
    116 		errexit("cannot allocate buffer pool\n");
    117 	cgblk.b_un.b_buf = bufp;
    118 	initbarea(&cgblk);
    119 	bufhead.b_next = bufhead.b_prev = &bufhead;
    120 	bufcnt = MAXBUFSPACE / sblock.fs_bsize;
    121 	if (bufcnt < MINBUFS)
    122 		bufcnt = MINBUFS;
    123 	for (i = 0; i < bufcnt; i++) {
    124 		bp = (struct bufarea *)malloc(sizeof(struct bufarea));
    125 		bufp = malloc((unsigned int)sblock.fs_bsize);
    126 		if (bp == NULL || bufp == NULL) {
    127 			if (i >= MINBUFS)
    128 				break;
    129 			errexit("cannot allocate buffer pool\n");
    130 		}
    131 		bp->b_un.b_buf = bufp;
    132 		bp->b_prev = &bufhead;
    133 		bp->b_next = bufhead.b_next;
    134 		bufhead.b_next->b_prev = bp;
    135 		bufhead.b_next = bp;
    136 		initbarea(bp);
    137 	}
    138 	bufhead.b_size = i;	/* save number of buffers */
    139 }
    140 
    141 /*
    142  * Manage a cache of directory blocks.
    143  */
    144 struct bufarea *
    145 getdatablk(blkno, size)
    146 	daddr_t blkno;
    147 	long size;
    148 {
    149 	register struct bufarea *bp;
    150 
    151 	for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
    152 		if (bp->b_bno == fsbtodb(&sblock, blkno))
    153 			goto foundit;
    154 	for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
    155 		if ((bp->b_flags & B_INUSE) == 0)
    156 			break;
    157 	if (bp == &bufhead)
    158 		errexit("deadlocked buffer pool\n");
    159 	getblk(bp, blkno, size);
    160 	/* fall through */
    161 foundit:
    162 	totalreads++;
    163 	bp->b_prev->b_next = bp->b_next;
    164 	bp->b_next->b_prev = bp->b_prev;
    165 	bp->b_prev = &bufhead;
    166 	bp->b_next = bufhead.b_next;
    167 	bufhead.b_next->b_prev = bp;
    168 	bufhead.b_next = bp;
    169 	bp->b_flags |= B_INUSE;
    170 	return (bp);
    171 }
    172 
    173 void
    174 getblk(bp, blk, size)
    175 	register struct bufarea *bp;
    176 	daddr_t blk;
    177 	long size;
    178 {
    179 	daddr_t dblk;
    180 
    181 	dblk = fsbtodb(&sblock, blk);
    182 	if (bp->b_bno != dblk) {
    183 		flush(fswritefd, bp);
    184 		diskreads++;
    185 		bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size);
    186 		bp->b_bno = dblk;
    187 		bp->b_size = size;
    188 	}
    189 }
    190 
    191 flush(fd, bp)
    192 	int fd;
    193 	register struct bufarea *bp;
    194 {
    195 	register int i, j;
    196 
    197 	if (!bp->b_dirty)
    198 		return;
    199 	if (bp->b_errs != 0)
    200 		pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n",
    201 		    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
    202 		    bp->b_bno);
    203 	bp->b_dirty = 0;
    204 	bp->b_errs = 0;
    205 	bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
    206 	if (bp != &sblk)
    207 		return;
    208 	for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
    209 		bwrite(fswritefd, (char *)sblock.fs_csp[j],
    210 		    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
    211 		    sblock.fs_cssize - i < sblock.fs_bsize ?
    212 		    sblock.fs_cssize - i : sblock.fs_bsize);
    213 	}
    214 }
    215 
    216 rwerror(mesg, blk)
    217 	char *mesg;
    218 	daddr_t blk;
    219 {
    220 
    221 	if (preen == 0)
    222 		printf("\n");
    223 	pfatal("CANNOT %s: BLK %ld", mesg, blk);
    224 	if (reply("CONTINUE") == 0)
    225 		errexit("Program terminated\n");
    226 }
    227 
    228 ckfini()
    229 {
    230 	register struct bufarea *bp, *nbp;
    231 	int cnt = 0;
    232 
    233 	flush(fswritefd, &sblk);
    234 	if (havesb && sblk.b_bno != SBOFF / dev_bsize &&
    235 	    !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
    236 		sblk.b_bno = SBOFF / dev_bsize;
    237 		sbdirty();
    238 		flush(fswritefd, &sblk);
    239 	}
    240 	flush(fswritefd, &cgblk);
    241 	free(cgblk.b_un.b_buf);
    242 	for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
    243 		cnt++;
    244 		flush(fswritefd, bp);
    245 		nbp = bp->b_prev;
    246 		free(bp->b_un.b_buf);
    247 		free((char *)bp);
    248 	}
    249 	if (bufhead.b_size != cnt)
    250 		errexit("Panic: lost %d buffers\n", bufhead.b_size - cnt);
    251 	pbp = pdirbp = (struct bufarea *)0;
    252 	if (debug)
    253 		printf("cache missed %ld of %ld (%d%%)\n", diskreads,
    254 		    totalreads, (int)(diskreads * 100 / totalreads));
    255 	(void)close(fsreadfd);
    256 	(void)close(fswritefd);
    257 }
    258 
    259 bread(fd, buf, blk, size)
    260 	int fd;
    261 	char *buf;
    262 	daddr_t blk;
    263 	long size;
    264 {
    265 	char *cp;
    266 	int i, errs;
    267 
    268 	if (lseek(fd, blk * dev_bsize, 0) < 0)
    269 		rwerror("SEEK", blk);
    270 	else if (read(fd, buf, (int)size) == size)
    271 		return (0);
    272 	rwerror("READ", blk);
    273 	if (lseek(fd, blk * dev_bsize, 0) < 0)
    274 		rwerror("SEEK", blk);
    275 	errs = 0;
    276 	bzero(buf, (size_t)size);
    277 	printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
    278 	for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
    279 		if (read(fd, cp, (int)secsize) != secsize) {
    280 			(void)lseek(fd, blk * dev_bsize + i + secsize, 0);
    281 			if (secsize != dev_bsize && dev_bsize != 1)
    282 				printf(" %ld (%ld),",
    283 				    (blk * dev_bsize + i) / secsize,
    284 				    blk + i / dev_bsize);
    285 			else
    286 				printf(" %ld,", blk + i / dev_bsize);
    287 			errs++;
    288 		}
    289 	}
    290 	printf("\n");
    291 	return (errs);
    292 }
    293 
    294 bwrite(fd, buf, blk, size)
    295 	int fd;
    296 	char *buf;
    297 	daddr_t blk;
    298 	long size;
    299 {
    300 	int i;
    301 	char *cp;
    302 
    303 	if (fd < 0)
    304 		return;
    305 	if (lseek(fd, blk * dev_bsize, 0) < 0)
    306 		rwerror("SEEK", blk);
    307 	else if (write(fd, buf, (int)size) == size) {
    308 		fsmodified = 1;
    309 		return;
    310 	}
    311 	rwerror("WRITE", blk);
    312 	if (lseek(fd, blk * dev_bsize, 0) < 0)
    313 		rwerror("SEEK", blk);
    314 	printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
    315 	for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
    316 		if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
    317 			(void)lseek(fd, blk * dev_bsize + i + dev_bsize, 0);
    318 			printf(" %ld,", blk + i / dev_bsize);
    319 		}
    320 	printf("\n");
    321 	return;
    322 }
    323 
    324 /*
    325  * allocate a data block with the specified number of fragments
    326  */
    327 allocblk(frags)
    328 	long frags;
    329 {
    330 	register int i, j, k;
    331 
    332 	if (frags <= 0 || frags > sblock.fs_frag)
    333 		return (0);
    334 	for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
    335 		for (j = 0; j <= sblock.fs_frag - frags; j++) {
    336 			if (testbmap(i + j))
    337 				continue;
    338 			for (k = 1; k < frags; k++)
    339 				if (testbmap(i + j + k))
    340 					break;
    341 			if (k < frags) {
    342 				j += k;
    343 				continue;
    344 			}
    345 			for (k = 0; k < frags; k++)
    346 				setbmap(i + j + k);
    347 			n_blks += frags;
    348 			return (i + j);
    349 		}
    350 	}
    351 	return (0);
    352 }
    353 
    354 /*
    355  * Free a previously allocated block
    356  */
    357 freeblk(blkno, frags)
    358 	daddr_t blkno;
    359 	long frags;
    360 {
    361 	struct inodesc idesc;
    362 
    363 	idesc.id_blkno = blkno;
    364 	idesc.id_numfrags = frags;
    365 	(void)pass4check(&idesc);
    366 }
    367 
    368 /*
    369  * Find a pathname
    370  */
    371 getpathname(namebuf, curdir, ino)
    372 	char *namebuf;
    373 	ino_t curdir, ino;
    374 {
    375 	int len;
    376 	register char *cp;
    377 	struct inodesc idesc;
    378 	static int busy = 0;
    379 	extern int findname();
    380 
    381 	if (busy ||
    382 	    (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) {
    383 		(void)strcpy(namebuf, "?");
    384 		return;
    385 	}
    386 	busy = 1;
    387 	bzero((char *)&idesc, sizeof(struct inodesc));
    388 	idesc.id_type = DATA;
    389 	idesc.id_fix = IGNORE;
    390 	cp = &namebuf[MAXPATHLEN - 1];
    391 	*cp = '\0';
    392 	if (curdir != ino) {
    393 		idesc.id_parent = curdir;
    394 		goto namelookup;
    395 	}
    396 	while (ino != ROOTINO) {
    397 		idesc.id_number = ino;
    398 		idesc.id_func = findino;
    399 		idesc.id_name = "..";
    400 		if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
    401 			break;
    402 	namelookup:
    403 		idesc.id_number = idesc.id_parent;
    404 		idesc.id_parent = ino;
    405 		idesc.id_func = findname;
    406 		idesc.id_name = namebuf;
    407 		if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
    408 			break;
    409 		len = strlen(namebuf);
    410 		cp -= len;
    411 		bcopy(namebuf, cp, (size_t)len);
    412 		*--cp = '/';
    413 		if (cp < &namebuf[MAXNAMLEN])
    414 			break;
    415 		ino = idesc.id_number;
    416 	}
    417 	busy = 0;
    418 	if (ino != ROOTINO)
    419 		*--cp = '?';
    420 	bcopy(cp, namebuf, (size_t)(&namebuf[MAXPATHLEN] - cp));
    421 }
    422 
    423 void
    424 catch()
    425 {
    426 	ckfini();
    427 	exit(12);
    428 }
    429 
    430 /*
    431  * When preening, allow a single quit to signal
    432  * a special exit after filesystem checks complete
    433  * so that reboot sequence may be interrupted.
    434  */
    435 void
    436 catchquit()
    437 {
    438 	extern returntosingle;
    439 
    440 	printf("returning to single-user after filesystem check\n");
    441 	returntosingle = 1;
    442 	(void)signal(SIGQUIT, SIG_DFL);
    443 }
    444 
    445 /*
    446  * Ignore a single quit signal; wait and flush just in case.
    447  * Used by child processes in preen.
    448  */
    449 void
    450 voidquit()
    451 {
    452 
    453 	sleep(1);
    454 	(void)signal(SIGQUIT, SIG_IGN);
    455 	(void)signal(SIGQUIT, SIG_DFL);
    456 }
    457 
    458 /*
    459  * determine whether an inode should be fixed.
    460  */
    461 dofix(idesc, msg)
    462 	register struct inodesc *idesc;
    463 	char *msg;
    464 {
    465 
    466 	switch (idesc->id_fix) {
    467 
    468 	case DONTKNOW:
    469 		if (idesc->id_type == DATA)
    470 			direrror(idesc->id_number, msg);
    471 		else
    472 			pwarn(msg);
    473 		if (preen) {
    474 			printf(" (SALVAGED)\n");
    475 			idesc->id_fix = FIX;
    476 			return (ALTERED);
    477 		}
    478 		if (reply("SALVAGE") == 0) {
    479 			idesc->id_fix = NOFIX;
    480 			return (0);
    481 		}
    482 		idesc->id_fix = FIX;
    483 		return (ALTERED);
    484 
    485 	case FIX:
    486 		return (ALTERED);
    487 
    488 	case NOFIX:
    489 	case IGNORE:
    490 		return (0);
    491 
    492 	default:
    493 		errexit("UNKNOWN INODESC FIX MODE %d\n", idesc->id_fix);
    494 	}
    495 	/* NOTREACHED */
    496 }
    497 
    498 /* VARARGS1 */
    499 errexit(s1, s2, s3, s4)
    500 	char *s1;
    501 {
    502 	printf(s1, s2, s3, s4);
    503 	exit(8);
    504 }
    505 
    506 /*
    507  * An unexpected inconsistency occured.
    508  * Die if preening, otherwise just print message and continue.
    509  */
    510 /* VARARGS1 */
    511 pfatal(s, a1, a2, a3)
    512 	char *s;
    513 {
    514 
    515 	if (preen) {
    516 		printf("%s: ", devname);
    517 		printf(s, a1, a2, a3);
    518 		printf("\n");
    519 		printf("%s: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.\n",
    520 			devname);
    521 		exit(8);
    522 	}
    523 	printf(s, a1, a2, a3);
    524 }
    525 
    526 /*
    527  * Pwarn just prints a message when not preening,
    528  * or a warning (preceded by filename) when preening.
    529  */
    530 /* VARARGS1 */
    531 pwarn(s, a1, a2, a3, a4, a5, a6)
    532 	char *s;
    533 {
    534 
    535 	if (preen)
    536 		printf("%s: ", devname);
    537 	printf(s, a1, a2, a3, a4, a5, a6);
    538 }
    539 
    540 #ifndef lint
    541 /*
    542  * Stub for routines from kernel.
    543  */
    544 panic(s)
    545 	char *s;
    546 {
    547 
    548 	pfatal("INTERNAL INCONSISTENCY:");
    549 	errexit(s);
    550 }
    551 #endif
    552