1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)sys.c 7.12 (Berkeley) 10/19/90 7 */ 8 9 #include "sys/param.h" 10 #include "ufs/dir.h" 11 #include "sys/reboot.h" 12 #include "saio.h" 13 14 #define isdigit(c) ((u_int)((c) - '0') <= 9) 15 #define isspace(c) ((c) == ' ' || (c) == '\t') 16 #define isupper(c) ((u_int)((c) - 'A') <= 'Z' - 'A') 17 #define tolower(c) ((c) - 'A' + 'a') 18 19 ino_t dlook(); 20 21 struct dirstuff { 22 int loc; 23 struct iob *io; 24 }; 25 26 struct iob iob[NFILES]; 27 28 static 29 openi(n, io) 30 register struct iob *io; 31 { 32 register struct dinode *dp; 33 int cc; 34 35 io->i_offset = 0; 36 io->i_bn = fsbtodb(&io->i_fs, itod(&io->i_fs, n)) + io->i_boff; 37 io->i_cc = io->i_fs.fs_bsize; 38 io->i_ma = io->i_buf; 39 cc = devread(io); 40 dp = (struct dinode *)io->i_buf; 41 io->i_ino = dp[itoo(&io->i_fs, n)]; 42 return (cc); 43 } 44 45 static 46 find(path, file) 47 register char *path; 48 struct iob *file; 49 { 50 register char *q; 51 char *dir, c; 52 int n; 53 54 if (path == NULL || *path == '\0') { 55 printf("null path\n"); 56 return (0); 57 } 58 59 if (openi((ino_t) ROOTINO, file) < 0) { 60 printf("can't read root inode\n"); 61 return (0); 62 } 63 dir = path; 64 while (*path) { 65 while (*path == '/') 66 path++; 67 q = path; 68 while(*q != '/' && *q != '\0') 69 q++; 70 c = *q; 71 *q = '\0'; 72 if (q == path) path = "." ; /* "/" means "/." */ 73 74 if ((n = dlook(path, file, dir)) != 0) { 75 if (c == '\0') 76 break; 77 if (openi(n, file) < 0) 78 return (0); 79 *q = c; 80 path = q; 81 continue; 82 } else { 83 printf("%s: not found\n", path); 84 return (0); 85 } 86 } 87 return (n); 88 } 89 90 #define NBUFS 4 91 static char b[NBUFS][MAXBSIZE]; 92 static daddr_t blknos[NBUFS]; 93 94 static daddr_t 95 sbmap(io, bn) 96 register struct iob *io; 97 daddr_t bn; 98 { 99 register struct dinode *ip; 100 int i, j, sh; 101 daddr_t nb, *bap; 102 103 ip = &io->i_ino; 104 if (bn < 0) { 105 printf("bn negative\n"); 106 return ((daddr_t)0); 107 } 108 109 /* 110 * blocks 0..NDADDR are direct blocks 111 */ 112 if(bn < NDADDR) { 113 nb = ip->di_db[bn]; 114 return (nb); 115 } 116 117 /* 118 * addresses NIADDR have single and double indirect blocks. 119 * the first step is to determine how many levels of indirection. 120 */ 121 sh = 1; 122 bn -= NDADDR; 123 for (j = NIADDR; j > 0; j--) { 124 sh *= NINDIR(&io->i_fs); 125 if (bn < sh) 126 break; 127 bn -= sh; 128 } 129 if (j == 0) { 130 printf("bn ovf %D\n", bn); 131 return ((daddr_t)0); 132 } 133 134 /* 135 * fetch the first indirect block address from the inode 136 */ 137 nb = ip->di_ib[NIADDR - j]; 138 if (nb == 0) { 139 printf("bn void %D\n",bn); 140 return ((daddr_t)0); 141 } 142 143 /* 144 * fetch through the indirect blocks 145 */ 146 for (; j <= NIADDR; j++) { 147 if (blknos[j] != nb) { 148 io->i_bn = fsbtodb(&io->i_fs, nb) + io->i_boff; 149 io->i_ma = b[j]; 150 io->i_cc = io->i_fs.fs_bsize; 151 if (devread(io) != io->i_fs.fs_bsize) { 152 if (io->i_error) 153 errno = io->i_error; 154 printf("bn %D: read error\n", io->i_bn); 155 return ((daddr_t)0); 156 } 157 blknos[j] = nb; 158 } 159 bap = (daddr_t *)b[j]; 160 sh /= NINDIR(&io->i_fs); 161 i = (bn / sh) % NINDIR(&io->i_fs); 162 nb = bap[i]; 163 if(nb == 0) { 164 printf("bn void %D\n",bn); 165 return ((daddr_t)0); 166 } 167 } 168 return (nb); 169 } 170 171 /* 172 * get next entry in a directory. 173 */ 174 struct direct * 175 readdir(dirp) 176 register struct dirstuff *dirp; 177 { 178 register struct direct *dp; 179 register struct iob *io; 180 daddr_t lbn, d; 181 int off; 182 183 io = dirp->io; 184 for(;;) { 185 if (dirp->loc >= io->i_ino.di_size) 186 return (NULL); 187 off = blkoff(&io->i_fs, dirp->loc); 188 if (off == 0) { 189 lbn = lblkno(&io->i_fs, dirp->loc); 190 d = sbmap(io, lbn); 191 if(d == 0) 192 return (NULL); 193 io->i_bn = fsbtodb(&io->i_fs, d) + io->i_boff; 194 io->i_ma = io->i_buf; 195 io->i_cc = dblksize(&io->i_fs, &io->i_ino, lbn); 196 if (devread(io) < 0) { 197 errno = io->i_error; 198 printf("bn %D: directory read error\n", 199 io->i_bn); 200 return (NULL); 201 } 202 } 203 dp = (struct direct *)(io->i_buf + off); 204 dirp->loc += dp->d_reclen; 205 if (dp->d_ino == 0) 206 continue; 207 return (dp); 208 } 209 } 210 211 static ino_t 212 dlook(s, io, dir) 213 char *s; 214 register struct iob *io; 215 char *dir; 216 { 217 register struct direct *dp; 218 register struct dinode *ip; 219 struct dirstuff dirp; 220 int len; 221 222 if (s == NULL || *s == '\0') 223 return (0); 224 ip = &io->i_ino; 225 if ((ip->di_mode&IFMT) != IFDIR) { 226 printf("%s: not a directory\n", dir); 227 return (0); 228 } 229 if (ip->di_size == 0) { 230 printf("%s: zero length directory\n", dir); 231 return (0); 232 } 233 len = strlen(s); 234 dirp.loc = 0; 235 dirp.io = io; 236 for (dp = readdir(&dirp); dp != NULL; dp = readdir(&dirp)) { 237 if(dp->d_ino == 0) 238 continue; 239 if (dp->d_namlen == len && !strcmp(s, dp->d_name)) 240 return (dp->d_ino); 241 } 242 return (0); 243 } 244 245 lseek(fdesc, addr, ptr) 246 int fdesc, ptr; 247 off_t addr; 248 { 249 register struct iob *io; 250 251 #ifndef SMALL 252 if (ptr != L_SET) { 253 printf("Seek not from beginning of file\n"); 254 errno = EOFFSET; 255 return (-1); 256 } 257 #endif 258 fdesc -= 3; 259 if (fdesc < 0 || fdesc >= NFILES || 260 ((io = &iob[fdesc])->i_flgs & F_ALLOC) == 0) { 261 errno = EBADF; 262 return (-1); 263 } 264 io->i_offset = addr; 265 io->i_bn = addr / DEV_BSIZE; 266 io->i_cc = 0; 267 return (0); 268 } 269 270 getc(fdesc) 271 int fdesc; 272 { 273 register struct iob *io; 274 register struct fs *fs; 275 register char *p; 276 int c, lbn, off, size, diff; 277 278 279 if (fdesc >= 0 && fdesc <= 2) 280 return (getchar()); 281 fdesc -= 3; 282 if (fdesc < 0 || fdesc >= NFILES || 283 ((io = &iob[fdesc])->i_flgs&F_ALLOC) == 0) { 284 errno = EBADF; 285 return (-1); 286 } 287 p = io->i_ma; 288 if (io->i_cc <= 0) { 289 if ((io->i_flgs & F_FILE) != 0) { 290 diff = io->i_ino.di_size - io->i_offset; 291 if (diff <= 0) 292 return (-1); 293 fs = &io->i_fs; 294 lbn = lblkno(fs, io->i_offset); 295 io->i_bn = fsbtodb(fs, sbmap(io, lbn)) + io->i_boff; 296 off = blkoff(fs, io->i_offset); 297 size = dblksize(fs, &io->i_ino, lbn); 298 } else { 299 io->i_bn = io->i_offset / DEV_BSIZE; 300 off = 0; 301 size = DEV_BSIZE; 302 } 303 io->i_ma = io->i_buf; 304 io->i_cc = size; 305 if (devread(io) < 0) { 306 errno = io->i_error; 307 return (-1); 308 } 309 if ((io->i_flgs & F_FILE) != 0) { 310 if (io->i_offset - off + size >= io->i_ino.di_size) 311 io->i_cc = diff + off; 312 io->i_cc -= off; 313 } 314 p = &io->i_buf[off]; 315 } 316 io->i_cc--; 317 io->i_offset++; 318 c = (unsigned)*p++; 319 io->i_ma = p; 320 return (c); 321 } 322 323 int errno; 324 325 read(fdesc, buf, count) 326 int fdesc, count; 327 char *buf; 328 { 329 register i, size; 330 register struct iob *file; 331 register struct fs *fs; 332 int lbn, off; 333 334 errno = 0; 335 if (fdesc >= 0 && fdesc <= 2) { 336 i = count; 337 do { 338 *buf = getchar(); 339 } while (--i && *buf++ != '\n'); 340 return (count - i); 341 } 342 fdesc -= 3; 343 if (fdesc < 0 || fdesc >= NFILES || 344 ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) { 345 errno = EBADF; 346 return (-1); 347 } 348 if ((file->i_flgs&F_READ) == 0) { 349 errno = EBADF; 350 return (-1); 351 } 352 #ifndef SMALL 353 if ((file->i_flgs & F_FILE) == 0) { 354 file->i_cc = count; 355 file->i_ma = buf; 356 file->i_bn = file->i_boff + (file->i_offset / DEV_BSIZE); 357 i = devread(file); 358 if (i < 0) 359 errno = file->i_error; 360 else 361 file->i_offset += i; 362 return (i); 363 } 364 #endif 365 if (file->i_offset+count > file->i_ino.di_size) 366 count = file->i_ino.di_size - file->i_offset; 367 if ((i = count) <= 0) 368 return (0); 369 /* 370 * While reading full blocks, do I/O into user buffer. 371 * Anything else uses getc(). 372 */ 373 fs = &file->i_fs; 374 while (i) { 375 off = blkoff(fs, file->i_offset); 376 lbn = lblkno(fs, file->i_offset); 377 size = dblksize(fs, &file->i_ino, lbn); 378 if (off == 0 && size <= i) { 379 file->i_bn = fsbtodb(fs, sbmap(file, lbn)) + 380 file->i_boff; 381 file->i_cc = size; 382 file->i_ma = buf; 383 if (devread(file) < 0) { 384 errno = file->i_error; 385 return (-1); 386 } 387 file->i_offset += size; 388 file->i_cc = 0; 389 buf += size; 390 i -= size; 391 } else { 392 size -= off; 393 if (size > i) 394 size = i; 395 i -= size; 396 do { 397 *buf++ = getc(fdesc+3); 398 } while (--size); 399 } 400 } 401 return (count); 402 } 403 404 #ifndef SMALL 405 write(fdesc, buf, count) 406 int fdesc, count; 407 char *buf; 408 { 409 register i; 410 register struct iob *file; 411 412 errno = 0; 413 if (fdesc >= 0 && fdesc <= 2) { 414 i = count; 415 while (i--) 416 putchar(*buf++); 417 return (count); 418 } 419 fdesc -= 3; 420 if (fdesc < 0 || fdesc >= NFILES || 421 ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) { 422 errno = EBADF; 423 return (-1); 424 } 425 if ((file->i_flgs&F_WRITE) == 0) { 426 errno = EBADF; 427 return (-1); 428 } 429 file->i_cc = count; 430 file->i_ma = buf; 431 file->i_bn = file->i_boff + (file->i_offset / DEV_BSIZE); 432 i = devwrite(file); 433 file->i_offset += count; 434 if (i < 0) 435 errno = file->i_error; 436 return (i); 437 } 438 #endif 439 440 int openfirst = 1; 441 u_int opendev; /* last device opened */ 442 extern u_int bootdev; 443 444 open(str, how) 445 char *str; 446 int how; 447 { 448 register char *t; 449 register int cnt; 450 register struct iob *file; 451 int fdesc, args[8], *argp; 452 453 if (openfirst) { 454 for (cnt = 0; cnt < NFILES; cnt++) 455 iob[cnt].i_flgs = 0; 456 openfirst = 0; 457 } 458 459 for (fdesc = 0;; fdesc++) { 460 if (fdesc == NFILES) 461 _stop("No more file slots"); 462 if (iob[fdesc].i_flgs == 0) { 463 file = &iob[fdesc]; 464 file->i_flgs |= F_ALLOC; 465 file->i_adapt = file->i_ctlr = file->i_unit = 466 file->i_part = 0; 467 break; 468 } 469 } 470 471 for (cnt = 0; cnt < sizeof(args)/sizeof(args[0]); args[cnt++] = 0); 472 #ifndef SMALL 473 for (t = str; *t && *t != '/' && *t != ':' && *t != '('; ++t) 474 if (isupper(*t)) 475 *t = tolower(*t); 476 switch(*t) { 477 case '(': /* type(adapt, ctlr, drive, partition)file */ 478 if ((file->i_dev = getdev(str, t - str)) == -1) 479 goto bad; 480 for (argp = args + 4, cnt = 0; *t != ')'; ++cnt) { 481 for (++t; isspace(*t); ++t); 482 if (*t == ')') 483 break; 484 if (!isdigit(*t)) 485 goto badspec; 486 *argp++ = atoi(t); 487 for (++t; isdigit(*t); ++t); 488 if (*t != ',' && *t != ')' || cnt == 4) 489 goto badspec; 490 } 491 for (++t; isspace(*t); ++t); 492 argp -= 4; 493 file->i_adapt = *argp++; 494 file->i_ctlr = *argp++; 495 file->i_unit = *argp++; 496 file->i_part = *argp; 497 break; 498 case ':': /* [A-Za-z]*[0-9]*[A-Za-z]:file */ 499 for (t = str; *t != ':' && !isdigit(*t); ++t); 500 if ((file->i_dev = getdev(str, t - str)) == -1) 501 goto bad; 502 if ((file->i_unit = getunit(t)) == -1) 503 goto bad; 504 for (; isdigit(*t); ++t); 505 if (*t >= 'a' && *t <= 'h') 506 file->i_part = *t++ - 'a'; 507 if (*t != ':') { 508 errno = EOFFSET; 509 goto badspec; 510 } 511 for (++t; isspace(*t); ++t); 512 break; 513 case '/': 514 default: /* default bootstrap unit and device */ 515 #else 516 { 517 #endif /* SMALL */ 518 file->i_dev = B_TYPE(bootdev); 519 file->i_adapt = B_ADAPTOR(bootdev); 520 file->i_ctlr = B_CONTROLLER(bootdev); 521 file->i_unit = B_UNIT(bootdev); 522 file->i_part = B_PARTITION(bootdev); 523 t = str; 524 } 525 526 opendev = MAKEBOOTDEV(file->i_dev, file->i_adapt, file->i_ctlr, 527 file->i_unit, file->i_part); 528 529 if (errno = devopen(file)) 530 goto bad; 531 532 if (*t == '\0') { 533 file->i_flgs |= how + 1; 534 file->i_cc = 0; 535 file->i_offset = 0; 536 return (fdesc+3); 537 } 538 #ifndef SMALL 539 else if (how != 0) { 540 printf("Can't write files yet.. Sorry\n"); 541 errno = EIO; 542 goto bad; 543 } 544 #endif 545 file->i_ma = (char *)(&file->i_fs); 546 file->i_cc = SBSIZE; 547 file->i_bn = SBOFF / DEV_BSIZE + file->i_boff; 548 file->i_offset = 0; 549 if (devread(file) < 0) { 550 errno = file->i_error; 551 printf("super block read error\n"); 552 goto bad; 553 } 554 if ((cnt = find(t, file)) == 0) { 555 errno = ESRCH; 556 goto bad; 557 } 558 if (openi(cnt, file) < 0) { 559 errno = file->i_error; 560 goto bad; 561 } 562 file->i_offset = 0; 563 file->i_cc = 0; 564 file->i_flgs |= F_FILE | (how+1); 565 return (fdesc+3); 566 567 #ifndef SMALL 568 badspec: 569 printf("malformed device specification\nusage: device(adaptor, controller, drive, partition)file\n"); 570 #endif 571 bad: 572 file->i_flgs = 0; 573 return (-1); 574 } 575 576 #ifndef SMALL 577 static 578 getdev(str, len) 579 register char *str; 580 int len; 581 { 582 register struct devsw *dp; 583 register int i; 584 char savedch = str[len]; 585 586 str[len] = '\0'; 587 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 588 if (dp->dv_name && strcmp(str, dp->dv_name) == 0) { 589 str[len] = savedch; 590 return (i); 591 } 592 printf("Unknown device\nKnown devices are:\n"); 593 for (dp = devsw, i = 0; i < ndevs; dp++, i++) 594 if (dp->dv_name) 595 printf(" %s", dp->dv_name); 596 printf("\n"); 597 errno = ENXIO; 598 return (-1); 599 } 600 601 static 602 getunit(cp) 603 register char *cp; 604 { 605 int unit; 606 607 unit = atoi(cp); 608 if ((u_int)unit > 255) { 609 printf("minor device number out of range (0-255)\n"); 610 errno = EUNIT; 611 return (-1); 612 } 613 return (unit); 614 } 615 #endif /* SMALL */ 616 617 close(fdesc) 618 int fdesc; 619 { 620 struct iob *file; 621 622 fdesc -= 3; 623 if (fdesc < 0 || fdesc >= NFILES || 624 ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) { 625 errno = EBADF; 626 return (-1); 627 } 628 if ((file->i_flgs&F_FILE) == 0) 629 devclose(file); 630 file->i_flgs = 0; 631 return (0); 632 } 633 634 #ifndef SMALL 635 ioctl(fdesc, cmd, arg) 636 int fdesc, cmd; 637 char *arg; 638 { 639 register struct iob *file; 640 int error = 0; 641 642 fdesc -= 3; 643 if (fdesc < 0 || fdesc >= NFILES || 644 ((file = &iob[fdesc])->i_flgs&F_ALLOC) == 0) { 645 errno = EBADF; 646 return (-1); 647 } 648 switch (cmd) { 649 650 case SAIOHDR: 651 file->i_flgs |= F_HDR; 652 break; 653 654 case SAIOCHECK: 655 file->i_flgs |= F_CHECK; 656 break; 657 658 case SAIOHCHECK: 659 file->i_flgs |= F_HCHECK; 660 break; 661 662 case SAIONOBAD: 663 file->i_flgs |= F_NBSF; 664 break; 665 666 case SAIODOBAD: 667 file->i_flgs &= ~F_NBSF; 668 break; 669 670 default: 671 error = devioctl(file, cmd, arg); 672 break; 673 } 674 if (error < 0) 675 errno = file->i_error; 676 return (error); 677 } 678 #endif /* SMALL */ 679 680 exit() 681 { 682 _stop("Exit called"); 683 } 684 685 _stop(s) 686 char *s; 687 { 688 int i; 689 static int stopped = 0; 690 691 if (!stopped) { 692 stopped++; 693 for (i = 0; i < NFILES; i++) 694 if (iob[i].i_flgs != 0) 695 close(i); 696 } 697 printf("%s\n", s); 698 _rtt(); 699 } 700