1 /* $OpenBSD: utilities.c,v 1.23 2014/07/13 16:08:53 pelikan 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> 35 #include <sys/time.h> 36 #include <ufs/ext2fs/ext2fs_dinode.h> 37 #include <ufs/ext2fs/ext2fs_dir.h> 38 #include <ufs/ext2fs/ext2fs.h> 39 #include <ufs/ufs/dinode.h> /* for IFMT & friends */ 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <ctype.h> 44 #include <unistd.h> 45 #include <errno.h> 46 47 #include "fsutil.h" 48 #include "fsck.h" 49 #include "extern.h" 50 51 long diskreads, totalreads; /* Disk cache statistics */ 52 53 static void rwerror(char *, daddr32_t); 54 55 int 56 ftypeok(struct ext2fs_dinode *dp) 57 { 58 switch (letoh16(dp->e2di_mode) & IFMT) { 59 60 case IFDIR: 61 case IFREG: 62 case IFBLK: 63 case IFCHR: 64 case IFLNK: 65 case IFSOCK: 66 case IFIFO: 67 return (1); 68 69 default: 70 if (debug) 71 printf("bad file type 0%o\n", letoh16(dp->e2di_mode)); 72 return (0); 73 } 74 } 75 76 int 77 reply(char *question) 78 { 79 int persevere; 80 int c; 81 82 if (preen) 83 pfatal("INTERNAL ERROR: GOT TO reply()"); 84 persevere = !strcmp(question, "CONTINUE"); 85 printf("\n"); 86 if (!persevere && (nflag || fswritefd < 0)) { 87 printf("%s? no\n\n", question); 88 return (0); 89 } 90 if (yflag || (persevere && nflag)) { 91 printf("%s? yes\n\n", question); 92 return (1); 93 } 94 do { 95 printf("%s? [Fyn?] ", question); 96 (void) fflush(stdout); 97 c = getc(stdin); 98 if (c == 'F') { 99 yflag = 1; 100 return (1); 101 } 102 while (c != '\n' && getc(stdin) != '\n') 103 if (feof(stdin)) 104 return (0); 105 } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N'); 106 printf("\n"); 107 if (c == 'y' || c == 'Y') 108 return (1); 109 return (0); 110 } 111 112 /* 113 * Malloc buffers and set up cache. 114 */ 115 void 116 bufinit(void) 117 { 118 struct bufarea *bp; 119 long bufcnt, i; 120 char *bufp; 121 122 diskreads = totalreads = 0; 123 pbp = pdirbp = (struct bufarea *)0; 124 bufhead.b_next = bufhead.b_prev = &bufhead; 125 bufcnt = MAXBUFSPACE / sblock.e2fs_bsize; 126 if (bufcnt < MINBUFS) 127 bufcnt = MINBUFS; 128 for (i = 0; i < bufcnt; i++) { 129 bp = (struct bufarea *)malloc(sizeof(struct bufarea)); 130 bufp = malloc((unsigned int)sblock.e2fs_bsize); 131 if (bp == NULL || bufp == NULL) { 132 free(bp); 133 free(bufp); 134 if (i >= MINBUFS) 135 break; 136 errexit("cannot allocate buffer pool\n"); 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 */ 151 struct bufarea * 152 getdatablk(daddr32_t blkno, long size) 153 { 154 struct bufarea *bp; 155 156 for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next) 157 if (bp->b_bno == fsbtodb(&sblock, blkno)) 158 goto foundit; 159 for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev) 160 if ((bp->b_flags & B_INUSE) == 0) 161 break; 162 if (bp == &bufhead) 163 errexit("deadlocked buffer pool\n"); 164 getblk(bp, blkno, size); 165 diskreads++; 166 /* fall through */ 167 foundit: 168 totalreads++; 169 bp->b_prev->b_next = bp->b_next; 170 bp->b_next->b_prev = bp->b_prev; 171 bp->b_prev = &bufhead; 172 bp->b_next = bufhead.b_next; 173 bufhead.b_next->b_prev = bp; 174 bufhead.b_next = bp; 175 bp->b_flags |= B_INUSE; 176 return (bp); 177 } 178 179 void 180 getblk(struct bufarea *bp, daddr32_t blk, long size) 181 { 182 daddr32_t dblk; 183 184 dblk = fsbtodb(&sblock, blk); 185 if (bp->b_bno != dblk) { 186 flush(fswritefd, bp); 187 diskreads++; 188 bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size); 189 bp->b_bno = dblk; 190 bp->b_size = size; 191 } 192 } 193 194 void 195 flush(int fd, struct bufarea *bp) 196 { 197 int i; 198 199 if (!bp->b_dirty) 200 return; 201 if (bp->b_errs != 0) 202 pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n", 203 (bp->b_errs == bp->b_size / DEV_BSIZE) ? "" : "PARTIALLY ", 204 bp->b_bno); 205 bp->b_dirty = 0; 206 bp->b_errs = 0; 207 bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size); 208 if (bp != &sblk) 209 return; 210 for (i = 0; i < sblock.e2fs_ngdb; i++) { 211 bwrite(fswritefd, (char *) 212 &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)], 213 fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1), 214 sblock.e2fs_bsize); 215 } 216 } 217 218 static void 219 rwerror(char *mesg, daddr32_t blk) 220 { 221 222 if (preen == 0) 223 printf("\n"); 224 pfatal("CANNOT %s: BLK %d", mesg, blk); 225 if (reply("CONTINUE") == 0) 226 errexit("Program terminated\n"); 227 } 228 229 void 230 ckfini(int markclean) 231 { 232 struct bufarea *bp, *nbp; 233 int cnt = 0; 234 235 if (fswritefd < 0) { 236 (void)close(fsreadfd); 237 return; 238 } 239 flush(fswritefd, &sblk); 240 if (havesb && sblk.b_bno != SBOFF / DEV_BSIZE && 241 !preen && reply("UPDATE STANDARD SUPERBLOCKS")) { 242 sblk.b_bno = SBOFF / DEV_BSIZE; 243 sbdirty(); 244 flush(fswritefd, &sblk); 245 copyback_sb(&asblk); 246 asblk.b_dirty = 1; 247 flush(fswritefd, &asblk); 248 } 249 for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) { 250 cnt++; 251 flush(fswritefd, bp); 252 nbp = bp->b_prev; 253 free(bp->b_un.b_buf); 254 free((char *)bp); 255 } 256 if (bufhead.b_size != cnt) 257 errexit("Panic: lost %d buffers\n", bufhead.b_size - cnt); 258 pbp = pdirbp = (struct bufarea *)0; 259 if (markclean && (sblock.e2fs.e2fs_state & E2FS_ISCLEAN) == 0) { 260 /* 261 * Mark the file system as clean, and sync the superblock. 262 */ 263 if (preen) 264 pwarn("MARKING FILE SYSTEM CLEAN\n"); 265 else if (!reply("MARK FILE SYSTEM CLEAN")) 266 markclean = 0; 267 if (markclean) { 268 sblock.e2fs.e2fs_state = E2FS_ISCLEAN; 269 sbdirty(); 270 flush(fswritefd, &sblk); 271 } 272 } 273 if (debug) 274 printf("cache missed %ld of %ld (%d%%)\n", diskreads, 275 totalreads, (int)(diskreads * 100 / totalreads)); 276 (void)close(fsreadfd); 277 (void)close(fswritefd); 278 } 279 280 int 281 bread(int fd, char *buf, daddr32_t blk, long size) 282 { 283 char *cp; 284 int i, errs; 285 off_t offset; 286 287 offset = blk; 288 offset *= DEV_BSIZE; 289 if (pread(fd, buf, size, offset) == size) 290 return (0); 291 rwerror("READ", blk); 292 errs = 0; 293 memset(buf, 0, (size_t)size); 294 printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:"); 295 for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) { 296 if (pread(fd, cp, secsize, offset + i) != secsize) { 297 if (secsize != DEV_BSIZE) 298 printf(" %lld (%lld),", 299 (long long)(offset + i) / secsize, 300 (long long)blk + i / DEV_BSIZE); 301 else 302 printf(" %lld,", (long long)blk + 303 i / DEV_BSIZE); 304 errs++; 305 } 306 } 307 printf("\n"); 308 return (errs); 309 } 310 311 void 312 bwrite(int fd, char *buf, daddr32_t blk, long size) 313 { 314 int i; 315 char *cp; 316 off_t offset; 317 318 if (fd < 0) 319 return; 320 offset = blk; 321 offset *= DEV_BSIZE; 322 if (pwrite(fd, buf, size, offset) == size) { 323 fsmodified = 1; 324 return; 325 } 326 rwerror("WRITE", blk); 327 printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:"); 328 for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) 329 if (pwrite(fd, cp, secsize, offset + i) != secsize) { 330 if (secsize != DEV_BSIZE) 331 printf(" %lld (%lld),", 332 (long long)(offset + i) / secsize, 333 (long long)blk + i / DEV_BSIZE); 334 else 335 printf(" %lld,", (long long)blk + 336 i / DEV_BSIZE); 337 } 338 printf("\n"); 339 return; 340 } 341 342 /* 343 * allocate a data block 344 */ 345 int 346 allocblk(void) 347 { 348 int i; 349 350 for (i = 0; i < maxfsblock - 1; i++) { 351 if (testbmap(i)) 352 continue; 353 setbmap(i); 354 n_blks ++; 355 return (i); 356 } 357 return (0); 358 } 359 360 /* 361 * Free a previously allocated block 362 */ 363 void 364 freeblk(daddr32_t blkno) 365 { 366 struct inodesc idesc; 367 368 idesc.id_blkno = blkno; 369 idesc.id_numfrags = 1; 370 (void)pass4check(&idesc); 371 } 372 373 /* 374 * Find a pathname 375 */ 376 void 377 getpathname(char *namebuf, size_t buflen, ino_t curdir, ino_t ino) 378 { 379 size_t len; 380 char *cp; 381 struct inodesc idesc; 382 static int busy = 0; 383 384 if (curdir == ino && ino == EXT2_ROOTINO) { 385 (void)strlcpy(namebuf, "/", buflen); 386 return; 387 } 388 if (busy || 389 (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) { 390 391 (void)strlcpy(namebuf, "?", buflen); 392 return; 393 } 394 busy = 1; 395 memset(&idesc, 0, sizeof(struct inodesc)); 396 idesc.id_type = DATA; 397 idesc.id_fix = IGNORE; 398 cp = &namebuf[buflen - 1]; 399 *cp = '\0'; 400 if (curdir != ino) { 401 idesc.id_parent = curdir; 402 goto namelookup; 403 } 404 while (ino != EXT2_ROOTINO) { 405 idesc.id_number = ino; 406 idesc.id_func = findino; 407 idesc.id_name = ".."; 408 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0) 409 break; 410 namelookup: 411 idesc.id_number = idesc.id_parent; 412 idesc.id_parent = ino; 413 idesc.id_func = findname; 414 idesc.id_name = namebuf; 415 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0) 416 break; 417 len = strlen(namebuf); 418 cp -= len; 419 memcpy(cp, namebuf, len); 420 *(--cp) = '/'; 421 if (cp < &namebuf[EXT2FS_MAXNAMLEN]) 422 break; 423 ino = idesc.id_number; 424 } 425 busy = 0; 426 if (ino != EXT2_ROOTINO) 427 *(--cp) = '?'; 428 memcpy(namebuf, cp, (size_t)(&namebuf[buflen] - cp)); 429 } 430 431 /*ARGSUSED*/ 432 void 433 catch(int signo) 434 { 435 ckfini(0); /* XXX signal race */ 436 _exit(12); 437 } 438 439 /* 440 * When preening, allow a single quit to signal 441 * a special exit after filesystem checks complete 442 * so that reboot sequence may be interrupted. 443 */ 444 /*ARGSUSED*/ 445 void 446 catchquit(int signo) 447 { 448 extern volatile sig_atomic_t returntosingle; 449 char buf[1024]; 450 451 snprintf(buf, sizeof buf, 452 "returning to single-user after filesystem check\n"); 453 write(STDOUT_FILENO, buf, strlen(buf)); 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