utilities.c revision 23799
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 sccsid[] = "@(#)utilities.c 8.6 (Berkeley) 5/19/95"; 36#endif /* not lint */ 37 38#include <sys/param.h> 39#include <sys/time.h> 40 41#include <ufs/ufs/dinode.h> 42#include <ufs/ufs/dir.h> 43#include <ufs/ffs/fs.h> 44 45#include <ctype.h> 46#include <err.h> 47#include <string.h> 48 49#include "fsck.h" 50 51long diskreads, totalreads; /* Disk cache statistics */ 52 53static void rwerror __P((char *mesg, ufs_daddr_t blk)); 54 55int 56ftypeok(dp) 57 struct dinode *dp; 58{ 59 switch (dp->di_mode & IFMT) { 60 61 case IFDIR: 62 case IFREG: 63 case IFBLK: 64 case IFCHR: 65 case IFLNK: 66 case IFSOCK: 67 case IFIFO: 68 return (1); 69 70 default: 71 if (debug) 72 printf("bad file type 0%o\n", dp->di_mode); 73 return (0); 74 } 75} 76 77int 78reply(question) 79 char *question; 80{ 81 int persevere; 82 char c; 83 84 if (preen) 85 pfatal("INTERNAL ERROR: GOT TO reply()"); 86 persevere = !strcmp(question, "CONTINUE"); 87 printf("\n"); 88 if (!persevere && (nflag || fswritefd < 0)) { 89 printf("%s? no\n\n", question); 90 return (0); 91 } 92 if (yflag || (persevere && nflag)) { 93 printf("%s? yes\n\n", question); 94 return (1); 95 } 96 do { 97 printf("%s? [yn] ", question); 98 (void) fflush(stdout); 99 c = getc(stdin); 100 while (c != '\n' && getc(stdin) != '\n') 101 if (feof(stdin)) 102 return (0); 103 } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N'); 104 printf("\n"); 105 if (c == 'y' || c == 'Y') 106 return (1); 107 return (0); 108} 109 110/* 111 * Malloc buffers and set up cache. 112 */ 113void 114bufinit() 115{ 116 register struct bufarea *bp; 117 long bufcnt, i; 118 char *bufp; 119 120 pbp = pdirbp = (struct bufarea *)0; 121 bufp = malloc((unsigned int)sblock.fs_bsize); 122 if (bufp == 0) 123 errx(EEXIT, "cannot allocate buffer pool"); 124 cgblk.b_un.b_buf = bufp; 125 initbarea(&cgblk); 126 bufhead.b_next = bufhead.b_prev = &bufhead; 127 bufcnt = MAXBUFSPACE / sblock.fs_bsize; 128 if (bufcnt < MINBUFS) 129 bufcnt = MINBUFS; 130 for (i = 0; i < bufcnt; i++) { 131 bp = (struct bufarea *)malloc(sizeof(struct bufarea)); 132 bufp = malloc((unsigned int)sblock.fs_bsize); 133 if (bp == NULL || bufp == NULL) { 134 if (i >= MINBUFS) 135 break; 136 errx(EEXIT, "cannot allocate buffer pool"); 137 } 138 bp->b_un.b_buf = bufp; 139 bp->b_prev = &bufhead; 140 bp->b_next = bufhead.b_next; 141 bufhead.b_next->b_prev = bp; 142 bufhead.b_next = bp; 143 initbarea(bp); 144 } 145 bufhead.b_size = i; /* save number of buffers */ 146} 147 148/* 149 * Manage a cache of directory blocks. 150 */ 151struct bufarea * 152getdatablk(blkno, size) 153 ufs_daddr_t blkno; 154 long size; 155{ 156 register struct bufarea *bp; 157 158 for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next) 159 if (bp->b_bno == fsbtodb(&sblock, blkno)) 160 goto foundit; 161 for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev) 162 if ((bp->b_flags & B_INUSE) == 0) 163 break; 164 if (bp == &bufhead) 165 errx(EEXIT, "deadlocked buffer pool"); 166 getblk(bp, blkno, size); 167 /* fall through */ 168foundit: 169 totalreads++; 170 bp->b_prev->b_next = bp->b_next; 171 bp->b_next->b_prev = bp->b_prev; 172 bp->b_prev = &bufhead; 173 bp->b_next = bufhead.b_next; 174 bufhead.b_next->b_prev = bp; 175 bufhead.b_next = bp; 176 bp->b_flags |= B_INUSE; 177 return (bp); 178} 179 180void 181getblk(bp, blk, size) 182 register struct bufarea *bp; 183 ufs_daddr_t blk; 184 long size; 185{ 186 ufs_daddr_t dblk; 187 188 dblk = fsbtodb(&sblock, blk); 189 if (bp->b_bno != dblk) { 190 flush(fswritefd, bp); 191 diskreads++; 192 bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size); 193 bp->b_bno = dblk; 194 bp->b_size = size; 195 } 196} 197 198void 199flush(fd, bp) 200 int fd; 201 register struct bufarea *bp; 202{ 203 register int i, j; 204 205 if (!bp->b_dirty) 206 return; 207 if (bp->b_errs != 0) 208 pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n", 209 (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ", 210 bp->b_bno); 211 bp->b_dirty = 0; 212 bp->b_errs = 0; 213 bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size); 214 if (bp != &sblk) 215 return; 216 for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) { 217 bwrite(fswritefd, (char *)sblock.fs_csp[j], 218 fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag), 219 sblock.fs_cssize - i < sblock.fs_bsize ? 220 sblock.fs_cssize - i : sblock.fs_bsize); 221 } 222} 223 224static void 225rwerror(mesg, blk) 226 char *mesg; 227 ufs_daddr_t blk; 228{ 229 230 if (preen == 0) 231 printf("\n"); 232 pfatal("CANNOT %s: BLK %ld", mesg, blk); 233 if (reply("CONTINUE") == 0) 234 exit(EEXIT); 235} 236 237void 238ckfini(markclean) 239 int markclean; 240{ 241 register struct bufarea *bp, *nbp; 242 int ofsmodified, cnt = 0; 243 244 if (fswritefd < 0) { 245 (void)close(fsreadfd); 246 return; 247 } 248 flush(fswritefd, &sblk); 249 if (havesb && sblk.b_bno != SBOFF / dev_bsize && 250 !preen && reply("UPDATE STANDARD SUPERBLOCK")) { 251 sblk.b_bno = SBOFF / dev_bsize; 252 sbdirty(); 253 flush(fswritefd, &sblk); 254 } 255 flush(fswritefd, &cgblk); 256 free(cgblk.b_un.b_buf); 257 for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) { 258 cnt++; 259 flush(fswritefd, bp); 260 nbp = bp->b_prev; 261 free(bp->b_un.b_buf); 262 free((char *)bp); 263 } 264 if (bufhead.b_size != cnt) 265 errx(EEXIT, "Panic: lost %d buffers", bufhead.b_size - cnt); 266 pbp = pdirbp = (struct bufarea *)0; 267 if (markclean && sblock.fs_clean == 0) { 268 sblock.fs_clean = 1; 269 sbdirty(); 270 ofsmodified = fsmodified; 271 flush(fswritefd, &sblk); 272 fsmodified = ofsmodified; 273 if (!preen) 274 printf("\n***** FILE SYSTEM MARKED CLEAN *****\n"); 275 } 276 if (debug) 277 printf("cache missed %ld of %ld (%d%%)\n", diskreads, 278 totalreads, (int)(diskreads * 100 / totalreads)); 279 (void)close(fsreadfd); 280 (void)close(fswritefd); 281} 282 283int 284bread(fd, buf, blk, size) 285 int fd; 286 char *buf; 287 ufs_daddr_t blk; 288 long size; 289{ 290 char *cp; 291 int i, errs; 292 off_t offset; 293 294 offset = blk; 295 offset *= dev_bsize; 296 if (lseek(fd, offset, 0) < 0) 297 rwerror("SEEK", blk); 298 else if (read(fd, buf, (int)size) == size) 299 return (0); 300 rwerror("READ", blk); 301 if (lseek(fd, offset, 0) < 0) 302 rwerror("SEEK", blk); 303 errs = 0; 304 memset(buf, 0, (size_t)size); 305 printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:"); 306 for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) { 307 if (read(fd, cp, (int)secsize) != secsize) { 308 (void)lseek(fd, offset + i + secsize, 0); 309 if (secsize != dev_bsize && dev_bsize != 1) 310 printf(" %ld (%ld),", 311 (blk * dev_bsize + i) / secsize, 312 blk + i / dev_bsize); 313 else 314 printf(" %ld,", blk + i / dev_bsize); 315 errs++; 316 } 317 } 318 printf("\n"); 319 return (errs); 320} 321 322void 323bwrite(fd, buf, blk, size) 324 int fd; 325 char *buf; 326 ufs_daddr_t blk; 327 long size; 328{ 329 int i; 330 char *cp; 331 off_t offset; 332 333 if (fd < 0) 334 return; 335 offset = blk; 336 offset *= dev_bsize; 337 if (lseek(fd, offset, 0) < 0) 338 rwerror("SEEK", blk); 339 else if (write(fd, buf, (int)size) == size) { 340 fsmodified = 1; 341 return; 342 } 343 rwerror("WRITE", blk); 344 if (lseek(fd, offset, 0) < 0) 345 rwerror("SEEK", blk); 346 printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:"); 347 for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize) 348 if (write(fd, cp, (int)dev_bsize) != dev_bsize) { 349 (void)lseek(fd, offset + i + dev_bsize, 0); 350 printf(" %ld,", blk + i / dev_bsize); 351 } 352 printf("\n"); 353 return; 354} 355 356/* 357 * allocate a data block with the specified number of fragments 358 */ 359ufs_daddr_t 360allocblk(frags) 361 long frags; 362{ 363 register int i, j, k; 364 365 if (frags <= 0 || frags > sblock.fs_frag) 366 return (0); 367 for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) { 368 for (j = 0; j <= sblock.fs_frag - frags; j++) { 369 if (testbmap(i + j)) 370 continue; 371 for (k = 1; k < frags; k++) 372 if (testbmap(i + j + k)) 373 break; 374 if (k < frags) { 375 j += k; 376 continue; 377 } 378 for (k = 0; k < frags; k++) 379 setbmap(i + j + k); 380 n_blks += frags; 381 return (i + j); 382 } 383 } 384 return (0); 385} 386 387/* 388 * Free a previously allocated block 389 */ 390void 391freeblk(blkno, frags) 392 ufs_daddr_t blkno; 393 long frags; 394{ 395 struct inodesc idesc; 396 397 idesc.id_blkno = blkno; 398 idesc.id_numfrags = frags; 399 (void)pass4check(&idesc); 400} 401 402/* 403 * Find a pathname 404 */ 405void 406getpathname(namebuf, curdir, ino) 407 char *namebuf; 408 ino_t curdir, ino; 409{ 410 int len; 411 register char *cp; 412 struct inodesc idesc; 413 static int busy = 0; 414 415 if (curdir == ino && ino == ROOTINO) { 416 (void)strcpy(namebuf, "/"); 417 return; 418 } 419 if (busy || 420 (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) { 421 (void)strcpy(namebuf, "?"); 422 return; 423 } 424 busy = 1; 425 memset(&idesc, 0, sizeof(struct inodesc)); 426 idesc.id_type = DATA; 427 idesc.id_fix = IGNORE; 428 cp = &namebuf[MAXPATHLEN - 1]; 429 *cp = '\0'; 430 if (curdir != ino) { 431 idesc.id_parent = curdir; 432 goto namelookup; 433 } 434 while (ino != ROOTINO) { 435 idesc.id_number = ino; 436 idesc.id_func = findino; 437 idesc.id_name = ".."; 438 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0) 439 break; 440 namelookup: 441 idesc.id_number = idesc.id_parent; 442 idesc.id_parent = ino; 443 idesc.id_func = findname; 444 idesc.id_name = namebuf; 445 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0) 446 break; 447 len = strlen(namebuf); 448 cp -= len; 449 memmove(cp, namebuf, (size_t)len); 450 *--cp = '/'; 451 if (cp < &namebuf[MAXNAMLEN]) 452 break; 453 ino = idesc.id_number; 454 } 455 busy = 0; 456 if (ino != ROOTINO) 457 *--cp = '?'; 458 memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp)); 459} 460 461void 462catch(sig) 463 int sig; 464{ 465 if (!doinglevel2) 466 ckfini(0); 467 exit(12); 468} 469 470/* 471 * When preening, allow a single quit to signal 472 * a special exit after filesystem checks complete 473 * so that reboot sequence may be interrupted. 474 */ 475void 476catchquit(sig) 477 int sig; 478{ 479 printf("returning to single-user after filesystem check\n"); 480 returntosingle = 1; 481 (void)signal(SIGQUIT, SIG_DFL); 482} 483 484/* 485 * Ignore a single quit signal; wait and flush just in case. 486 * Used by child processes in preen. 487 */ 488void 489voidquit(sig) 490 int sig; 491{ 492 493 sleep(1); 494 (void)signal(SIGQUIT, SIG_IGN); 495 (void)signal(SIGQUIT, SIG_DFL); 496} 497 498/* 499 * determine whether an inode should be fixed. 500 */ 501int 502dofix(idesc, msg) 503 register struct inodesc *idesc; 504 char *msg; 505{ 506 507 switch (idesc->id_fix) { 508 509 case DONTKNOW: 510 if (idesc->id_type == DATA) 511 direrror(idesc->id_number, msg); 512 else 513 pwarn(msg); 514 if (preen) { 515 printf(" (SALVAGED)\n"); 516 idesc->id_fix = FIX; 517 return (ALTERED); 518 } 519 if (reply("SALVAGE") == 0) { 520 idesc->id_fix = NOFIX; 521 return (0); 522 } 523 idesc->id_fix = FIX; 524 return (ALTERED); 525 526 case FIX: 527 return (ALTERED); 528 529 case NOFIX: 530 case IGNORE: 531 return (0); 532 533 default: 534 errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix); 535 } 536 /* NOTREACHED */ 537 return (0); 538} 539 540#if __STDC__ 541#include <stdarg.h> 542#else 543#include <varargs.h> 544#endif 545 546/* 547 * An unexpected inconsistency occured. 548 * Die if preening, otherwise just print message and continue. 549 */ 550void 551#if __STDC__ 552pfatal(const char *fmt, ...) 553#else 554pfatal(fmt, va_alist) 555 char *fmt; 556 va_dcl 557#endif 558{ 559 va_list ap; 560#if __STDC__ 561 va_start(ap, fmt); 562#else 563 va_start(ap); 564#endif 565 if (!preen) { 566 (void)vfprintf(stderr, fmt, ap); 567 va_end(ap); 568 return; 569 } 570 (void)fprintf(stderr, "%s: ", cdevname); 571 (void)vfprintf(stderr, fmt, ap); 572 (void)fprintf(stderr, 573 "\n%s: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.\n", 574 cdevname); 575 exit(EEXIT); 576} 577 578/* 579 * Pwarn just prints a message when not preening, 580 * or a warning (preceded by filename) when preening. 581 */ 582void 583#if __STDC__ 584pwarn(const char *fmt, ...) 585#else 586pwarn(fmt, va_alist) 587 char *fmt; 588 va_dcl 589#endif 590{ 591 va_list ap; 592#if __STDC__ 593 va_start(ap, fmt); 594#else 595 va_start(ap); 596#endif 597 if (preen) 598 (void)fprintf(stderr, "%s: ", cdevname); 599 (void)vfprintf(stderr, fmt, ap); 600 va_end(ap); 601} 602 603/* 604 * Stub for routines from kernel. 605 */ 606void 607#if __STDC__ 608panic(const char *fmt, ...) 609#else 610panic(fmt, va_alist) 611 char *fmt; 612 va_dcl 613#endif 614{ 615 va_list ap; 616#if __STDC__ 617 va_start(ap, fmt); 618#else 619 va_start(ap); 620#endif 621 pfatal("INTERNAL INCONSISTENCY:"); 622 (void)vfprintf(stderr, fmt, ap); 623 va_end(ap); 624 exit(EEXIT); 625} 626