1 /* $OpenBSD: utilities.c,v 1.28 2019/02/06 16:21:27 millert Exp $ */ 2 /* $NetBSD: utilities.c,v 1.6 2001/02/04 21:19:34 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1980, 1986, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. 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 #include <sys/param.h> /* DEV_BSIZE isset setbit */ 35 #include <sys/time.h> 36 #include <sys/signal.h> 37 #include <ufs/ext2fs/ext2fs_dinode.h> 38 #include <ufs/ext2fs/ext2fs_dir.h> 39 #include <ufs/ext2fs/ext2fs.h> 40 #include <ufs/ufs/dinode.h> /* for IFMT & friends */ 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <ctype.h> 45 #include <unistd.h> 46 #include <errno.h> 47 48 #include "fsutil.h" 49 #include "fsck.h" 50 #include "extern.h" 51 52 long diskreads, totalreads; /* Disk cache statistics */ 53 54 static void rwerror(char *, daddr32_t); 55 56 int 57 ftypeok(struct ext2fs_dinode *dp) 58 { 59 switch (letoh16(dp->e2di_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", letoh16(dp->e2di_mode)); 73 return (0); 74 } 75 } 76 77 int 78 reply(char *question) 79 { 80 int persevere; 81 int c; 82 83 if (preen) 84 pfatal("INTERNAL ERROR: GOT TO reply()"); 85 persevere = !strcmp(question, "CONTINUE"); 86 printf("\n"); 87 if (!persevere && (nflag || fswritefd < 0)) { 88 printf("%s? no\n\n", question); 89 return (0); 90 } 91 if (yflag || (persevere && nflag)) { 92 printf("%s? yes\n\n", question); 93 return (1); 94 } 95 do { 96 printf("%s? [Fyn?] ", question); 97 (void) fflush(stdout); 98 c = getc(stdin); 99 if (c == 'F') { 100 yflag = 1; 101 return (1); 102 } 103 while (c != '\n' && getc(stdin) != '\n') 104 if (feof(stdin)) 105 return (0); 106 } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N'); 107 printf("\n"); 108 if (c == 'y' || c == 'Y') 109 return (1); 110 return (0); 111 } 112 113 /* 114 * Malloc buffers and set up cache. 115 */ 116 void 117 bufinit(void) 118 { 119 struct bufarea *bp; 120 long bufcnt, i; 121 char *bufp; 122 123 diskreads = totalreads = 0; 124 pbp = pdirbp = NULL; 125 bufhead.b_next = bufhead.b_prev = &bufhead; 126 bufcnt = MAXBUFSPACE / sblock.e2fs_bsize; 127 if (bufcnt < MINBUFS) 128 bufcnt = MINBUFS; 129 for (i = 0; i < bufcnt; i++) { 130 bp = malloc(sizeof(struct bufarea)); 131 bufp = malloc((unsigned int)sblock.e2fs_bsize); 132 if (bp == NULL || bufp == NULL) { 133 free(bp); 134 free(bufp); 135 if (i >= MINBUFS) 136 break; 137 errexit("cannot allocate buffer pool\n"); 138 } 139 bp->b_un.b_buf = bufp; 140 bp->b_prev = &bufhead; 141 bp->b_next = bufhead.b_next; 142 bufhead.b_next->b_prev = bp; 143 bufhead.b_next = bp; 144 initbarea(bp); 145 } 146 bufhead.b_size = i; /* save number of buffers */ 147 } 148 149 /* 150 * Manage a cache of directory blocks. 151 */ 152 struct bufarea * 153 getdatablk(daddr32_t blkno, long size) 154 { 155 struct bufarea *bp; 156 157 for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next) 158 if (bp->b_bno == fsbtodb(&sblock, blkno)) 159 goto foundit; 160 for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev) 161 if ((bp->b_flags & B_INUSE) == 0) 162 break; 163 if (bp == &bufhead) 164 errexit("deadlocked buffer pool\n"); 165 getblk(bp, blkno, size); 166 diskreads++; 167 /* fall through */ 168 foundit: 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 } 179 180 void 181 getblk(struct bufarea *bp, daddr32_t blk, long size) 182 { 183 daddr32_t dblk; 184 185 dblk = fsbtodb(&sblock, blk); 186 if (bp->b_bno != dblk) { 187 flush(fswritefd, bp); 188 diskreads++; 189 bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size); 190 bp->b_bno = dblk; 191 bp->b_size = size; 192 } 193 } 194 195 void 196 flush(int fd, struct bufarea *bp) 197 { 198 int i; 199 200 if (!bp->b_dirty) 201 return; 202 if (bp->b_errs != 0) 203 pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n", 204 (bp->b_errs == bp->b_size / DEV_BSIZE) ? "" : "PARTIALLY ", 205 bp->b_bno); 206 bp->b_dirty = 0; 207 bp->b_errs = 0; 208 bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size); 209 if (bp != &sblk) 210 return; 211 for (i = 0; i < sblock.e2fs_ngdb; i++) { 212 bwrite(fswritefd, (char *) 213 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 214 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 215 sblock.e2fs_bsize); 216 } 217 } 218 219 static void 220 rwerror(char *mesg, daddr32_t blk) 221 { 222 223 if (preen == 0) 224 printf("\n"); 225 pfatal("CANNOT %s: BLK %d", mesg, blk); 226 if (reply("CONTINUE") == 0) 227 errexit("Program terminated\n"); 228 } 229 230 void 231 ckfini(int markclean) 232 { 233 struct bufarea *bp, *nbp; 234 int cnt = 0; 235 236 if (fswritefd < 0) { 237 (void)close(fsreadfd); 238 return; 239 } 240 flush(fswritefd, &sblk); 241 if (havesb && sblk.b_bno != SBOFF / DEV_BSIZE && 242 !preen && reply("UPDATE STANDARD SUPERBLOCKS")) { 243 sblk.b_bno = SBOFF / DEV_BSIZE; 244 sbdirty(); 245 flush(fswritefd, &sblk); 246 copyback_sb(&asblk); 247 asblk.b_dirty = 1; 248 flush(fswritefd, &asblk); 249 } 250 for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) { 251 cnt++; 252 flush(fswritefd, bp); 253 nbp = bp->b_prev; 254 free(bp->b_un.b_buf); 255 free((char *)bp); 256 } 257 if (bufhead.b_size != cnt) 258 errexit("Panic: lost %d buffers\n", bufhead.b_size - cnt); 259 pbp = pdirbp = NULL; 260 if (markclean && (sblock.e2fs.e2fs_state & E2FS_ISCLEAN) == 0) { 261 /* 262 * Mark the file system as clean, and sync the superblock. 263 */ 264 if (preen) 265 pwarn("MARKING FILE SYSTEM CLEAN\n"); 266 else if (!reply("MARK FILE SYSTEM CLEAN")) 267 markclean = 0; 268 if (markclean) { 269 sblock.e2fs.e2fs_state = E2FS_ISCLEAN; 270 sbdirty(); 271 flush(fswritefd, &sblk); 272 } 273 } 274 if (debug) 275 printf("cache missed %ld of %ld (%d%%)\n", diskreads, 276 totalreads, (int)(diskreads * 100 / totalreads)); 277 (void)close(fsreadfd); 278 (void)close(fswritefd); 279 } 280 281 int 282 bread(int fd, char *buf, daddr32_t blk, long size) 283 { 284 char *cp; 285 int i, errs; 286 off_t offset; 287 288 offset = blk; 289 offset *= DEV_BSIZE; 290 if (pread(fd, buf, size, offset) == size) 291 return (0); 292 rwerror("READ", blk); 293 errs = 0; 294 memset(buf, 0, (size_t)size); 295 printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:"); 296 for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) { 297 if (pread(fd, cp, secsize, offset + i) != secsize) { 298 if (secsize != DEV_BSIZE) 299 printf(" %lld (%lld),", 300 (long long)(offset + i) / secsize, 301 (long long)blk + i / DEV_BSIZE); 302 else 303 printf(" %lld,", (long long)blk + 304 i / DEV_BSIZE); 305 errs++; 306 } 307 } 308 printf("\n"); 309 return (errs); 310 } 311 312 void 313 bwrite(int fd, char *buf, daddr32_t blk, long size) 314 { 315 int i; 316 char *cp; 317 off_t offset; 318 319 if (fd < 0) 320 return; 321 offset = blk; 322 offset *= DEV_BSIZE; 323 if (pwrite(fd, buf, size, offset) == size) { 324 fsmodified = 1; 325 return; 326 } 327 rwerror("WRITE", blk); 328 printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:"); 329 for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) 330 if (pwrite(fd, cp, secsize, offset + i) != secsize) { 331 if (secsize != DEV_BSIZE) 332 printf(" %lld (%lld),", 333 (long long)(offset + i) / secsize, 334 (long long)blk + i / DEV_BSIZE); 335 else 336 printf(" %lld,", (long long)blk + 337 i / DEV_BSIZE); 338 } 339 printf("\n"); 340 return; 341 } 342 343 /* 344 * allocate a data block 345 */ 346 int 347 allocblk(void) 348 { 349 int i; 350 351 for (i = 0; i < maxfsblock - 1; i++) { 352 if (testbmap(i)) 353 continue; 354 setbmap(i); 355 n_blks ++; 356 return (i); 357 } 358 return (0); 359 } 360 361 /* 362 * Free a previously allocated block 363 */ 364 void 365 freeblk(daddr32_t blkno) 366 { 367 struct inodesc idesc; 368 369 idesc.id_blkno = blkno; 370 idesc.id_numfrags = 1; 371 (void)pass4check(&idesc); 372 } 373 374 /* 375 * Find a pathname 376 */ 377 void 378 getpathname(char *namebuf, size_t buflen, ino_t curdir, ino_t ino) 379 { 380 size_t len; 381 char *cp; 382 struct inodesc idesc; 383 static int busy = 0; 384 385 if (curdir == ino && ino == EXT2_ROOTINO) { 386 (void)strlcpy(namebuf, "/", buflen); 387 return; 388 } 389 if (busy || 390 (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) { 391 392 (void)strlcpy(namebuf, "?", buflen); 393 return; 394 } 395 busy = 1; 396 memset(&idesc, 0, sizeof(struct inodesc)); 397 idesc.id_type = DATA; 398 idesc.id_fix = IGNORE; 399 cp = &namebuf[buflen - 1]; 400 *cp = '\0'; 401 if (curdir != ino) { 402 idesc.id_parent = curdir; 403 goto namelookup; 404 } 405 while (ino != EXT2_ROOTINO) { 406 idesc.id_number = ino; 407 idesc.id_func = findino; 408 idesc.id_name = ".."; 409 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0) 410 break; 411 namelookup: 412 idesc.id_number = idesc.id_parent; 413 idesc.id_parent = ino; 414 idesc.id_func = findname; 415 idesc.id_name = namebuf; 416 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0) 417 break; 418 len = strlen(namebuf); 419 cp -= len; 420 memmove(cp, namebuf, len); 421 *(--cp) = '/'; 422 if (cp < &namebuf[EXT2FS_MAXNAMLEN]) 423 break; 424 ino = idesc.id_number; 425 } 426 busy = 0; 427 if (ino != EXT2_ROOTINO) 428 *(--cp) = '?'; 429 memmove(namebuf, cp, (size_t)(&namebuf[buflen] - cp)); 430 } 431 432 /*ARGSUSED*/ 433 void 434 catch(int signo) 435 { 436 ckfini(0); /* XXX signal race */ 437 _exit(12); 438 } 439 440 /* 441 * When preening, allow a single quit to signal 442 * a special exit after filesystem checks complete 443 * so that reboot sequence may be interrupted. 444 */ 445 /*ARGSUSED*/ 446 void 447 catchquit(int signo) 448 { 449 extern volatile sig_atomic_t returntosingle; 450 static const char message[] = 451 "returning to single-user after filesystem check\n"; 452 453 write(STDOUT_FILENO, message, sizeof(message)-1); 454 returntosingle = 1; 455 (void)signal(SIGQUIT, SIG_DFL); 456 } 457 458 /* 459 * Ignore a single quit signal; wait and flush just in case. 460 * Used by child processes in preen. 461 */ 462 /*ARGSUSED*/ 463 void 464 voidquit(int signo) 465 { 466 int save_errno = errno; 467 468 sleep(1); 469 (void)signal(SIGQUIT, SIG_IGN); 470 (void)signal(SIGQUIT, SIG_DFL); 471 errno = save_errno; 472 } 473 474 /* 475 * determine whether an inode should be fixed. 476 */ 477 int 478 dofix(struct inodesc *idesc, char *msg) 479 { 480 481 switch (idesc->id_fix) { 482 483 case DONTKNOW: 484 if (idesc->id_type == DATA) 485 direrror(idesc->id_number, msg); 486 else 487 pwarn("%s", msg); 488 if (preen) { 489 printf(" (SALVAGED)\n"); 490 idesc->id_fix = FIX; 491 return (ALTERED); 492 } 493 if (reply("SALVAGE") == 0) { 494 idesc->id_fix = NOFIX; 495 return (0); 496 } 497 idesc->id_fix = FIX; 498 return (ALTERED); 499 500 case FIX: 501 return (ALTERED); 502 503 case NOFIX: 504 case IGNORE: 505 return (0); 506 507 default: 508 errexit("UNKNOWN INODESC FIX MODE %d\n", idesc->id_fix); 509 } 510 /* NOTREACHED */ 511 } 512