| 1 | #define MAXINO 3000 |
| 2 | #define BITS 8 |
| 3 | #define MAXXTR 60 |
| 4 | #define NCACHE 3 |
| 5 | |
| 6 | #ifndef STANDALONE |
| 7 | #include <stdio.h> |
| 8 | #include <signal.h> |
| 9 | #endif |
| 10 | #include <sys/param.h> |
| 11 | #include <sys/inode.h> |
| 12 | #include <sys/ino.h> |
| 13 | #include <sys/fblk.h> |
| 14 | #include <sys/filsys.h> |
| 15 | #include <sys/dir.h> |
| 16 | #include <dumprestor.h> |
| 17 | |
| 18 | #define MWORD(m,i) (m[(unsigned)(i-1)/MLEN]) |
| 19 | #define MBIT(i) (1<<((unsigned)(i-1)%MLEN)) |
| 20 | #define BIS(i,w) (MWORD(w,i) |= MBIT(i)) |
| 21 | #define BIC(i,w) (MWORD(w,i) &= ~MBIT(i)) |
| 22 | #define BIT(i,w) (MWORD(w,i) & MBIT(i)) |
| 23 | |
| 24 | struct filsys sblock; |
| 25 | |
| 26 | int fi; |
| 27 | ino_t ino, maxi, curino; |
| 28 | |
| 29 | int mt; |
| 30 | char tapename[] = "/dev/rmt1"; |
| 31 | char *magtape = tapename; |
| 32 | #ifdef STANDALONE |
| 33 | char mbuf[50]; |
| 34 | #endif |
| 35 | |
| 36 | #ifndef STANDALONE |
| 37 | daddr_t seekpt; |
| 38 | int df, ofile; |
| 39 | char dirfile[] = "rstXXXXXX"; |
| 40 | |
| 41 | struct { |
| 42 | ino_t t_ino; |
| 43 | daddr_t t_seekpt; |
| 44 | } inotab[MAXINO]; |
| 45 | int ipos; |
| 46 | |
| 47 | #define ONTAPE 1 |
| 48 | #define XTRACTD 2 |
| 49 | #define XINUSE 4 |
| 50 | struct xtrlist { |
| 51 | ino_t x_ino; |
| 52 | char x_flags; |
| 53 | } xtrlist[MAXXTR]; |
| 54 | |
| 55 | char name[12]; |
| 56 | |
| 57 | char drblock[BSIZE]; |
| 58 | int bpt; |
| 59 | #endif |
| 60 | |
| 61 | int eflag; |
| 62 | |
| 63 | int volno = 1; |
| 64 | |
| 65 | struct dinode tino, dino; |
| 66 | daddr_t taddr[NADDR]; |
| 67 | |
| 68 | daddr_t curbno; |
| 69 | |
| 70 | short dumpmap[MSIZ]; |
| 71 | short clrimap[MSIZ]; |
| 72 | |
| 73 | |
| 74 | int bct = NTREC+1; |
| 75 | char tbf[NTREC*BSIZE]; |
| 76 | |
| 77 | struct cache { |
| 78 | daddr_t c_bno; |
| 79 | int c_time; |
| 80 | char c_block[BSIZE]; |
| 81 | } cache[NCACHE]; |
| 82 | int curcache; |
| 83 | |
| 84 | main(argc, argv) |
| 85 | char *argv[]; |
| 86 | { |
| 87 | register char *cp; |
| 88 | char command; |
| 89 | int done(); |
| 90 | |
| 91 | #ifndef STANDALONE |
| 92 | mktemp(dirfile); |
| 93 | if (argc < 2) { |
| 94 | usage: |
| 95 | printf("Usage: restor x file file..., restor r filesys, or restor t\n"); |
| 96 | exit(1); |
| 97 | } |
| 98 | argv++; |
| 99 | argc -= 2; |
| 100 | for (cp = *argv++; *cp; cp++) { |
| 101 | switch (*cp) { |
| 102 | case '-': |
| 103 | break; |
| 104 | case 'f': |
| 105 | magtape = *argv++; |
| 106 | argc--; |
| 107 | break; |
| 108 | case 'r': |
| 109 | case 'R': |
| 110 | case 't': |
| 111 | case 'x': |
| 112 | command = *cp; |
| 113 | break; |
| 114 | default: |
| 115 | printf("Bad key character %c\n", *cp); |
| 116 | goto usage; |
| 117 | } |
| 118 | } |
| 119 | if (command == 'x') { |
| 120 | if (signal(SIGINT, done) == SIG_IGN) |
| 121 | signal(SIGINT, SIG_IGN); |
| 122 | if (signal(SIGTERM, done) == SIG_IGN) |
| 123 | signal(SIGTERM, SIG_IGN); |
| 124 | |
| 125 | df = creat(dirfile, 0666); |
| 126 | if (df < 0) { |
| 127 | printf("restor: %s - cannot create directory temporary\n", dirfile); |
| 128 | exit(1); |
| 129 | } |
| 130 | close(df); |
| 131 | df = open(dirfile, 2); |
| 132 | } |
| 133 | doit(command, argc, argv); |
| 134 | if (command == 'x') |
| 135 | unlink(dirfile); |
| 136 | exit(0); |
| 137 | #else |
| 138 | magtape = "tape"; |
| 139 | doit('r', 1, 0); |
| 140 | #endif |
| 141 | } |
| 142 | |
| 143 | doit(command, argc, argv) |
| 144 | char command; |
| 145 | int argc; |
| 146 | char *argv[]; |
| 147 | { |
| 148 | extern char *ctime(); |
| 149 | register i, k; |
| 150 | ino_t d; |
| 151 | #ifndef STANDALONE |
| 152 | int xtrfile(), skip(); |
| 153 | #endif |
| 154 | int rstrfile(), rstrskip(); |
| 155 | struct dinode *ip, *ip1; |
| 156 | |
| 157 | #ifndef STANDALONE |
| 158 | if ((mt = open(magtape, 0)) < 0) { |
| 159 | printf("%s: cannot open tape\n", magtape); |
| 160 | exit(1); |
| 161 | } |
| 162 | #else |
| 163 | do { |
| 164 | printf("Tape? "); |
| 165 | gets(mbuf); |
| 166 | mt = open(mbuf, 0); |
| 167 | } while (mt == -1); |
| 168 | magtape = mbuf; |
| 169 | #endif |
| 170 | switch(command) { |
| 171 | #ifndef STANDALONE |
| 172 | case 't': |
| 173 | if (readhdr(&spcl) == 0) { |
| 174 | printf("Tape is not a dump tape\n"); |
| 175 | exit(1); |
| 176 | } |
| 177 | printf("Dump date: %s", ctime(&spcl.c_date)); |
| 178 | printf("Dumped from: %s", ctime(&spcl.c_ddate)); |
| 179 | return; |
| 180 | case 'x': |
| 181 | if (readhdr(&spcl) == 0) { |
| 182 | printf("Tape is not a dump tape\n"); |
| 183 | exit(1); |
| 184 | } |
| 185 | if (checkvol(&spcl, 1) == 0) { |
| 186 | printf("Tape is not volume 1 of the dump\n"); |
| 187 | exit(1); |
| 188 | } |
| 189 | pass1(); /* This sets the various maps on the way by */ |
| 190 | i = 0; |
| 191 | while (i < MAXXTR-1 && argc--) { |
| 192 | if ((d = psearch(*argv)) == 0 || BIT(d, dumpmap) == 0) { |
| 193 | printf("%s: not on the tape\n", *argv++); |
| 194 | continue; |
| 195 | } |
| 196 | xtrlist[i].x_ino = d; |
| 197 | xtrlist[i].x_flags |= XINUSE; |
| 198 | printf("%s: inode %u\n", *argv, d); |
| 199 | argv++; |
| 200 | i++; |
| 201 | } |
| 202 | newvol: |
| 203 | flsht(); |
| 204 | close(mt); |
| 205 | getvol: |
| 206 | printf("Mount desired tape volume: Specify volume #: "); |
| 207 | if (gets(tbf) == NULL) |
| 208 | return; |
| 209 | volno = atoi(tbf); |
| 210 | if (volno <= 0) { |
| 211 | printf("Volume numbers are positive numerics\n"); |
| 212 | goto getvol; |
| 213 | } |
| 214 | mt = open(magtape, 0); |
| 215 | if (readhdr(&spcl) == 0) { |
| 216 | printf("tape is not dump tape\n"); |
| 217 | goto newvol; |
| 218 | } |
| 219 | if (checkvol(&spcl, volno) == 0) { |
| 220 | printf("Wrong volume (%d)\n", spcl.c_volume); |
| 221 | goto newvol; |
| 222 | } |
| 223 | rbits: |
| 224 | while (gethead(&spcl) == 0) |
| 225 | ; |
| 226 | if (checktype(&spcl, TS_INODE) == 1) { |
| 227 | printf("Can't find inode mask!\n"); |
| 228 | goto newvol; |
| 229 | } |
| 230 | if (checktype(&spcl, TS_BITS) == 0) |
| 231 | goto rbits; |
| 232 | readbits(dumpmap); |
| 233 | i = 0; |
| 234 | for (k = 0; xtrlist[k].x_flags; k++) { |
| 235 | if (BIT(xtrlist[k].x_ino, dumpmap)) { |
| 236 | xtrlist[k].x_flags |= ONTAPE; |
| 237 | i++; |
| 238 | } |
| 239 | } |
| 240 | while (i > 0) { |
| 241 | again: |
| 242 | if (ishead(&spcl) == 0) |
| 243 | while(gethead(&spcl) == 0) |
| 244 | ; |
| 245 | if (checktype(&spcl, TS_END) == 1) { |
| 246 | printf("end of tape\n"); |
| 247 | checkdone: |
| 248 | for (k = 0; xtrlist[k].x_flags; k++) |
| 249 | if ((xtrlist[k].x_flags&XTRACTD) == 0) |
| 250 | goto newvol; |
| 251 | return; |
| 252 | } |
| 253 | if (checktype(&spcl, TS_INODE) == 0) { |
| 254 | gethead(&spcl); |
| 255 | goto again; |
| 256 | } |
| 257 | d = spcl.c_inumber; |
| 258 | for (k = 0; xtrlist[k].x_flags; k++) { |
| 259 | if (d == xtrlist[k].x_ino) { |
| 260 | printf("extract file %u\n", xtrlist[k].x_ino); |
| 261 | sprintf(name, "%u", xtrlist[k].x_ino); |
| 262 | if ((ofile = creat(name, 0666)) < 0) { |
| 263 | printf("%s: cannot create file\n", name); |
| 264 | i--; |
| 265 | continue; |
| 266 | } |
| 267 | chown(name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid); |
| 268 | getfile(ino, xtrfile, skip, spcl.c_dinode.di_size); |
| 269 | i--; |
| 270 | xtrlist[k].x_flags |= XTRACTD; |
| 271 | close(ofile); |
| 272 | goto done; |
| 273 | } |
| 274 | } |
| 275 | gethead(&spcl); |
| 276 | done: |
| 277 | ; |
| 278 | } |
| 279 | goto checkdone; |
| 280 | #endif |
| 281 | case 'r': |
| 282 | case 'R': |
| 283 | #ifndef STANDALONE |
| 284 | if ((fi = open(*argv, 2)) < 0) { |
| 285 | printf("%s: cannot open\n", *argv); |
| 286 | exit(1); |
| 287 | } |
| 288 | #else |
| 289 | do { |
| 290 | char charbuf[50]; |
| 291 | |
| 292 | printf("Disk? "); |
| 293 | gets(charbuf); |
| 294 | fi = open(charbuf, 2); |
| 295 | } while (fi == -1); |
| 296 | #endif |
| 297 | #ifndef STANDALONE |
| 298 | if (command == 'R') { |
| 299 | printf("Enter starting volume number: "); |
| 300 | if (gets(tbf) == EOF) { |
| 301 | volno = 1; |
| 302 | printf("\n"); |
| 303 | } |
| 304 | else |
| 305 | volno = atoi(tbf); |
| 306 | } |
| 307 | else |
| 308 | #endif |
| 309 | volno = 1; |
| 310 | printf("Last chance before scribbling on %s. ", |
| 311 | #ifdef STANDALONE |
| 312 | "disk"); |
| 313 | #else |
| 314 | *argv); |
| 315 | #endif |
| 316 | while (getchar() != '\n'); |
| 317 | dread((daddr_t)1, (char *)&sblock, sizeof(sblock)); |
| 318 | maxi = (sblock.s_isize-2)*INOPB; |
| 319 | if (readhdr(&spcl) == 0) { |
| 320 | printf("Missing volume record\n"); |
| 321 | exit(1); |
| 322 | } |
| 323 | if (checkvol(&spcl, volno) == 0) { |
| 324 | printf("Tape is not volume %d\n", volno); |
| 325 | exit(1); |
| 326 | } |
| 327 | gethead(&spcl); |
| 328 | for (;;) { |
| 329 | ragain: |
| 330 | if (ishead(&spcl) == 0) { |
| 331 | printf("Missing header block\n"); |
| 332 | while (gethead(&spcl) == 0) |
| 333 | ; |
| 334 | eflag++; |
| 335 | } |
| 336 | if (checktype(&spcl, TS_END) == 1) { |
| 337 | printf("End of tape\n"); |
| 338 | close(mt); |
| 339 | dwrite( (daddr_t) 1, (char *) &sblock); |
| 340 | return; |
| 341 | } |
| 342 | if (checktype(&spcl, TS_CLRI) == 1) { |
| 343 | readbits(clrimap); |
| 344 | for (ino = 1; ino <= maxi; ino++) |
| 345 | if (BIT(ino, clrimap) == 0) { |
| 346 | getdino(ino, &tino); |
| 347 | if (tino.di_mode == 0) |
| 348 | continue; |
| 349 | itrunc(&tino); |
| 350 | clri(&tino); |
| 351 | putdino(ino, &tino); |
| 352 | } |
| 353 | dwrite( (daddr_t) 1, (char *) &sblock); |
| 354 | goto ragain; |
| 355 | } |
| 356 | if (checktype(&spcl, TS_BITS) == 1) { |
| 357 | readbits(dumpmap); |
| 358 | goto ragain; |
| 359 | } |
| 360 | if (checktype(&spcl, TS_INODE) == 0) { |
| 361 | printf("Unknown header type\n"); |
| 362 | eflag++; |
| 363 | gethead(&spcl); |
| 364 | goto ragain; |
| 365 | } |
| 366 | ino = spcl.c_inumber; |
| 367 | if (eflag) |
| 368 | printf("Resynced at inode %u\n", ino); |
| 369 | eflag = 0; |
| 370 | if (ino > maxi) { |
| 371 | printf("%u: ilist too small\n", ino); |
| 372 | gethead(&spcl); |
| 373 | goto ragain; |
| 374 | } |
| 375 | dino = spcl.c_dinode; |
| 376 | getdino(ino, &tino); |
| 377 | curbno = 0; |
| 378 | itrunc(&tino); |
| 379 | clri(&tino); |
| 380 | for (i = 0; i < NADDR; i++) |
| 381 | taddr[i] = 0; |
| 382 | l3tol(taddr, dino.di_addr, 1); |
| 383 | getfile(d, rstrfile, rstrskip, dino.di_size); |
| 384 | ip = &tino; |
| 385 | ltol3(ip->di_addr, taddr, NADDR); |
| 386 | ip1 = &dino; |
| 387 | ip->di_mode = ip1->di_mode; |
| 388 | ip->di_nlink = ip1->di_nlink; |
| 389 | ip->di_uid = ip1->di_uid; |
| 390 | ip->di_gid = ip1->di_gid; |
| 391 | ip->di_size = ip1->di_size; |
| 392 | ip->di_atime = ip1->di_atime; |
| 393 | ip->di_mtime = ip1->di_mtime; |
| 394 | ip->di_ctime = ip1->di_ctime; |
| 395 | putdino(ino, &tino); |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Read the tape, bulding up a directory structure for extraction |
| 402 | * by name |
| 403 | */ |
| 404 | #ifndef STANDALONE |
| 405 | pass1() |
| 406 | { |
| 407 | register i; |
| 408 | struct dinode *ip; |
| 409 | int putdir(), null(); |
| 410 | |
| 411 | while (gethead(&spcl) == 0) { |
| 412 | printf("Can't find directory header!\n"); |
| 413 | } |
| 414 | for (;;) { |
| 415 | if (checktype(&spcl, TS_BITS) == 1) { |
| 416 | readbits(dumpmap); |
| 417 | continue; |
| 418 | } |
| 419 | if (checktype(&spcl, TS_CLRI) == 1) { |
| 420 | readbits(clrimap); |
| 421 | continue; |
| 422 | } |
| 423 | if (checktype(&spcl, TS_INODE) == 0) { |
| 424 | finish: |
| 425 | flsh(); |
| 426 | close(mt); |
| 427 | return; |
| 428 | } |
| 429 | ip = &spcl.c_dinode; |
| 430 | i = ip->di_mode & IFMT; |
| 431 | if (i != IFDIR) { |
| 432 | goto finish; |
| 433 | } |
| 434 | inotab[ipos].t_ino = spcl.c_inumber; |
| 435 | inotab[ipos++].t_seekpt = seekpt; |
| 436 | getfile(spcl.c_inumber, putdir, null, spcl.c_dinode.di_size); |
| 437 | putent("\000\000/"); |
| 438 | } |
| 439 | } |
| 440 | #endif |
| 441 | |
| 442 | /* |
| 443 | * Do the file extraction, calling the supplied functions |
| 444 | * with the blocks |
| 445 | */ |
| 446 | getfile(n, f1, f2, size) |
| 447 | ino_t n; |
| 448 | int (*f2)(), (*f1)(); |
| 449 | long size; |
| 450 | { |
| 451 | register i; |
| 452 | struct spcl addrblock; |
| 453 | char buf[BSIZE]; |
| 454 | |
| 455 | addrblock = spcl; |
| 456 | curino = n; |
| 457 | goto start; |
| 458 | for (;;) { |
| 459 | if (gethead(&addrblock) == 0) { |
| 460 | printf("Missing address (header) block\n"); |
| 461 | goto eloop; |
| 462 | } |
| 463 | if (checktype(&addrblock, TS_ADDR) == 0) { |
| 464 | spcl = addrblock; |
| 465 | curino = 0; |
| 466 | curino = 0; |
| 467 | return; |
| 468 | } |
| 469 | start: |
| 470 | for (i = 0; i < addrblock.c_count; i++) { |
| 471 | if (addrblock.c_addr[i]) { |
| 472 | readtape(buf); |
| 473 | (*f1)(buf, size > BSIZE ? (long) BSIZE : size); |
| 474 | } |
| 475 | else { |
| 476 | clearbuf(buf); |
| 477 | (*f2)(buf, size > BSIZE ? (long) BSIZE : size); |
| 478 | } |
| 479 | if ((size -= BSIZE) <= 0) { |
| 480 | eloop: |
| 481 | while (gethead(&spcl) == 0) |
| 482 | ; |
| 483 | if (checktype(&spcl, TS_ADDR) == 1) |
| 484 | goto eloop; |
| 485 | curino = 0; |
| 486 | return; |
| 487 | } |
| 488 | } |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Do the tape i\/o, dealling with volume changes |
| 494 | * etc.. |
| 495 | */ |
| 496 | readtape(b) |
| 497 | char *b; |
| 498 | { |
| 499 | register i; |
| 500 | struct spcl tmpbuf; |
| 501 | |
| 502 | if (bct >= NTREC) { |
| 503 | for (i = 0; i < NTREC; i++) |
| 504 | ((struct spcl *)&tbf[i*BSIZE])->c_magic = 0; |
| 505 | bct = 0; |
| 506 | if ((i = read(mt, tbf, NTREC*BSIZE)) < 0) { |
| 507 | printf("Tape read error: inode %u\n", curino); |
| 508 | eflag++; |
| 509 | exit(1); |
| 510 | } |
| 511 | if (i == 0) { |
| 512 | bct = NTREC + 1; |
| 513 | volno++; |
| 514 | loop: |
| 515 | flsht(); |
| 516 | close(mt); |
| 517 | printf("Mount volume %d\n", volno); |
| 518 | while (getchar() != '\n') |
| 519 | ; |
| 520 | if ((mt = open(magtape, 0)) == -1) { |
| 521 | printf("Cannot open tape!\n"); |
| 522 | goto loop; |
| 523 | } |
| 524 | if (readhdr(&tmpbuf) == 0) { |
| 525 | printf("Not a dump tape.Try again\n"); |
| 526 | goto loop; |
| 527 | } |
| 528 | if (checkvol(&tmpbuf, volno) == 0) { |
| 529 | printf("Wrong tape. Try again\n"); |
| 530 | goto loop; |
| 531 | } |
| 532 | readtape(b); |
| 533 | return; |
| 534 | } |
| 535 | } |
| 536 | copy(&tbf[(bct++*BSIZE)], b, BSIZE); |
| 537 | } |
| 538 | |
| 539 | flsht() |
| 540 | { |
| 541 | bct = NTREC+1; |
| 542 | } |
| 543 | |
| 544 | copy(f, t, s) |
| 545 | register char *f, *t; |
| 546 | { |
| 547 | register i; |
| 548 | |
| 549 | i = s; |
| 550 | do |
| 551 | *t++ = *f++; |
| 552 | while (--i); |
| 553 | } |
| 554 | |
| 555 | clearbuf(cp) |
| 556 | register char *cp; |
| 557 | { |
| 558 | register i; |
| 559 | |
| 560 | i = BSIZE; |
| 561 | do |
| 562 | *cp++ = 0; |
| 563 | while (--i); |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Put and get the directory entries from the compressed |
| 568 | * directory file |
| 569 | */ |
| 570 | #ifndef STANDALONE |
| 571 | putent(cp) |
| 572 | char *cp; |
| 573 | { |
| 574 | register i; |
| 575 | |
| 576 | for (i = 0; i < sizeof(ino_t); i++) |
| 577 | writec(*cp++); |
| 578 | for (i = 0; i < DIRSIZ; i++) { |
| 579 | writec(*cp); |
| 580 | if (*cp++ == 0) |
| 581 | return; |
| 582 | } |
| 583 | return; |
| 584 | } |
| 585 | |
| 586 | getent(bf) |
| 587 | register char *bf; |
| 588 | { |
| 589 | register i; |
| 590 | |
| 591 | for (i = 0; i < sizeof(ino_t); i++) |
| 592 | *bf++ = readc(); |
| 593 | for (i = 0; i < DIRSIZ; i++) |
| 594 | if ((*bf++ = readc()) == 0) |
| 595 | return; |
| 596 | return; |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * read/write te directory file |
| 601 | */ |
| 602 | writec(c) |
| 603 | char c; |
| 604 | { |
| 605 | drblock[bpt++] = c; |
| 606 | seekpt++; |
| 607 | if (bpt >= BSIZE) { |
| 608 | bpt = 0; |
| 609 | write(df, drblock, BSIZE); |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | readc() |
| 614 | { |
| 615 | if (bpt >= BSIZE) { |
| 616 | read(df, drblock, BSIZE); |
| 617 | bpt = 0; |
| 618 | } |
| 619 | return(drblock[bpt++]); |
| 620 | } |
| 621 | |
| 622 | mseek(pt) |
| 623 | daddr_t pt; |
| 624 | { |
| 625 | bpt = BSIZE; |
| 626 | lseek(df, pt, 0); |
| 627 | } |
| 628 | |
| 629 | flsh() |
| 630 | { |
| 631 | write(df, drblock, bpt+1); |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * search the directory inode ino |
| 636 | * looking for entry cp |
| 637 | */ |
| 638 | ino_t |
| 639 | search(inum, cp) |
| 640 | ino_t inum; |
| 641 | char *cp; |
| 642 | { |
| 643 | register i; |
| 644 | struct direct dir; |
| 645 | |
| 646 | for (i = 0; i < MAXINO; i++) |
| 647 | if (inotab[i].t_ino == inum) { |
| 648 | goto found; |
| 649 | } |
| 650 | return(0); |
| 651 | found: |
| 652 | mseek(inotab[i].t_seekpt); |
| 653 | do { |
| 654 | getent((char *)&dir); |
| 655 | if (direq(dir.d_name, "/")) |
| 656 | return(0); |
| 657 | } while (direq(dir.d_name, cp) == 0); |
| 658 | return(dir.d_ino); |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * Search the directory tree rooted at inode 2 |
| 663 | * for the path pointed at by n |
| 664 | */ |
| 665 | psearch(n) |
| 666 | char *n; |
| 667 | { |
| 668 | register char *cp, *cp1; |
| 669 | char c; |
| 670 | |
| 671 | ino = 2; |
| 672 | if (*(cp = n) == '/') |
| 673 | cp++; |
| 674 | next: |
| 675 | cp1 = cp + 1; |
| 676 | while (*cp1 != '/' && *cp1) |
| 677 | cp1++; |
| 678 | c = *cp1; |
| 679 | *cp1 = 0; |
| 680 | ino = search(ino, cp); |
| 681 | if (ino == 0) { |
| 682 | *cp1 = c; |
| 683 | return(0); |
| 684 | } |
| 685 | *cp1 = c; |
| 686 | if (c == '/') { |
| 687 | cp = cp1+1; |
| 688 | goto next; |
| 689 | } |
| 690 | return(ino); |
| 691 | } |
| 692 | |
| 693 | direq(s1, s2) |
| 694 | register char *s1, *s2; |
| 695 | { |
| 696 | register i; |
| 697 | |
| 698 | for (i = 0; i < DIRSIZ; i++) |
| 699 | if (*s1++ == *s2) { |
| 700 | if (*s2++ == 0) |
| 701 | return(1); |
| 702 | } else |
| 703 | return(0); |
| 704 | return(1); |
| 705 | } |
| 706 | #endif |
| 707 | |
| 708 | /* |
| 709 | * read/write a disk block, be sure to update the buffer |
| 710 | * cache if needed. |
| 711 | */ |
| 712 | dwrite(bno, b) |
| 713 | daddr_t bno; |
| 714 | char *b; |
| 715 | { |
| 716 | register i; |
| 717 | |
| 718 | for (i = 0; i < NCACHE; i++) { |
| 719 | if (cache[i].c_bno == bno) { |
| 720 | copy(b, cache[i].c_block, BSIZE); |
| 721 | cache[i].c_time = 0; |
| 722 | break; |
| 723 | } |
| 724 | else |
| 725 | cache[i].c_time++; |
| 726 | } |
| 727 | lseek(fi, bno*BSIZE, 0); |
| 728 | if(write(fi, b, BSIZE) != BSIZE) { |
| 729 | #ifdef STANDALONE |
| 730 | printf("disk write error %D\n", bno); |
| 731 | #else |
| 732 | fprintf(stderr, "disk write error %ld\n", bno); |
| 733 | #endif |
| 734 | exit(1); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | dread(bno, buf, cnt) |
| 739 | daddr_t bno; |
| 740 | char *buf; |
| 741 | { |
| 742 | register i, j; |
| 743 | |
| 744 | j = 0; |
| 745 | for (i = 0; i < NCACHE; i++) { |
| 746 | if (++curcache >= NCACHE) |
| 747 | curcache = 0; |
| 748 | if (cache[curcache].c_bno == bno) { |
| 749 | copy(cache[curcache].c_block, buf, cnt); |
| 750 | cache[curcache].c_time = 0; |
| 751 | return; |
| 752 | } |
| 753 | else { |
| 754 | cache[curcache].c_time++; |
| 755 | if (cache[j].c_time < cache[curcache].c_time) |
| 756 | j = curcache; |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | lseek(fi, bno*BSIZE, 0); |
| 761 | if (read(fi, cache[j].c_block, BSIZE) != BSIZE) { |
| 762 | #ifdef STANDALONE |
| 763 | printf("read error %D\n", bno); |
| 764 | #else |
| 765 | printf("read error %ld\n", bno); |
| 766 | #endif |
| 767 | exit(1); |
| 768 | } |
| 769 | copy(cache[j].c_block, buf, cnt); |
| 770 | cache[j].c_time = 0; |
| 771 | cache[j].c_bno = bno; |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * the inode manpulation routines. Like the system. |
| 776 | * |
| 777 | * clri zeros the inode |
| 778 | */ |
| 779 | clri(ip) |
| 780 | struct dinode *ip; |
| 781 | { |
| 782 | int i, *p; |
| 783 | i = sizeof(struct dinode)/sizeof(int); |
| 784 | p = (int *)ip; |
| 785 | do |
| 786 | *p++ = 0; |
| 787 | while(--i); |
| 788 | } |
| 789 | |
| 790 | /* |
| 791 | * itrunc/tloop/bfree free all of the blocks pointed at by the inode |
| 792 | */ |
| 793 | itrunc(ip) |
| 794 | register struct dinode *ip; |
| 795 | { |
| 796 | register i; |
| 797 | daddr_t bn, iaddr[NADDR]; |
| 798 | |
| 799 | if (ip->di_mode == 0) |
| 800 | return; |
| 801 | i = ip->di_mode & IFMT; |
| 802 | if (i != IFDIR && i != IFREG) |
| 803 | return; |
| 804 | l3tol(iaddr, ip->di_addr, NADDR); |
| 805 | for(i=NADDR-1;i>=0;i--) { |
| 806 | bn = iaddr[i]; |
| 807 | if(bn == 0) continue; |
| 808 | switch(i) { |
| 809 | |
| 810 | default: |
| 811 | bfree(bn); |
| 812 | break; |
| 813 | |
| 814 | case NADDR-3: |
| 815 | tloop(bn, 0, 0); |
| 816 | break; |
| 817 | |
| 818 | case NADDR-2: |
| 819 | tloop(bn, 1, 0); |
| 820 | break; |
| 821 | |
| 822 | case NADDR-1: |
| 823 | tloop(bn, 1, 1); |
| 824 | } |
| 825 | } |
| 826 | ip->di_size = 0; |
| 827 | } |
| 828 | |
| 829 | tloop(bn, f1, f2) |
| 830 | daddr_t bn; |
| 831 | int f1, f2; |
| 832 | { |
| 833 | register i; |
| 834 | daddr_t nb; |
| 835 | union { |
| 836 | char data[BSIZE]; |
| 837 | daddr_t indir[NINDIR]; |
| 838 | } ibuf; |
| 839 | |
| 840 | dread(bn, ibuf.data, BSIZE); |
| 841 | for(i=NINDIR-1;i>=0;i--) { |
| 842 | nb = ibuf.indir[i]; |
| 843 | if(nb) { |
| 844 | if(f1) |
| 845 | tloop(nb, f2, 0); |
| 846 | else |
| 847 | bfree(nb); |
| 848 | } |
| 849 | } |
| 850 | bfree(bn); |
| 851 | } |
| 852 | |
| 853 | bfree(bn) |
| 854 | daddr_t bn; |
| 855 | { |
| 856 | register i; |
| 857 | union { |
| 858 | char data[BSIZE]; |
| 859 | struct fblk frees; |
| 860 | } fbuf; |
| 861 | |
| 862 | if(sblock.s_nfree >= NICFREE) { |
| 863 | fbuf.df_nfree = sblock.s_nfree; |
| 864 | for(i=0;i<NICFREE;i++) |
| 865 | fbuf.df_free[i] = sblock.s_free[i]; |
| 866 | sblock.s_nfree = 0; |
| 867 | dwrite(bn, fbuf.data); |
| 868 | } |
| 869 | sblock.s_free[sblock.s_nfree++] = bn; |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * allocate a block off the free list. |
| 874 | */ |
| 875 | daddr_t |
| 876 | balloc() |
| 877 | { |
| 878 | daddr_t bno; |
| 879 | register i; |
| 880 | static char zeroes[BSIZE]; |
| 881 | union { |
| 882 | char data[BSIZE]; |
| 883 | struct fblk frees; |
| 884 | } fbuf; |
| 885 | |
| 886 | if(sblock.s_nfree == 0 || (bno=sblock.s_free[--sblock.s_nfree]) == 0) { |
| 887 | #ifdef STANDALONE |
| 888 | printf("Out of space\n"); |
| 889 | #else |
| 890 | fprintf(stderr, "Out of space.\n"); |
| 891 | #endif |
| 892 | exit(1); |
| 893 | } |
| 894 | if(sblock.s_nfree == 0) { |
| 895 | dread(bno, fbuf.data, BSIZE); |
| 896 | sblock.s_nfree = fbuf.df_nfree; |
| 897 | for(i=0;i<NICFREE;i++) |
| 898 | sblock.s_free[i] = fbuf.df_free[i]; |
| 899 | } |
| 900 | dwrite(bno, zeroes); |
| 901 | return(bno); |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * map a block number into a block address, ensuring |
| 906 | * all of the correct indirect blocks are around. Allocate |
| 907 | * the block requested. |
| 908 | */ |
| 909 | daddr_t |
| 910 | bmap(iaddr, bn) |
| 911 | daddr_t iaddr[NADDR]; |
| 912 | daddr_t bn; |
| 913 | { |
| 914 | register i; |
| 915 | int j, sh; |
| 916 | daddr_t nb, nnb; |
| 917 | daddr_t indir[NINDIR]; |
| 918 | |
| 919 | /* |
| 920 | * blocks 0..NADDR-4 are direct blocks |
| 921 | */ |
| 922 | if(bn < NADDR-3) { |
| 923 | iaddr[bn] = nb = balloc(); |
| 924 | return(nb); |
| 925 | } |
| 926 | |
| 927 | /* |
| 928 | * addresses NADDR-3, NADDR-2, and NADDR-1 |
| 929 | * have single, double, triple indirect blocks. |
| 930 | * the first step is to determine |
| 931 | * how many levels of indirection. |
| 932 | */ |
| 933 | sh = 0; |
| 934 | nb = 1; |
| 935 | bn -= NADDR-3; |
| 936 | for(j=3; j>0; j--) { |
| 937 | sh += NSHIFT; |
| 938 | nb <<= NSHIFT; |
| 939 | if(bn < nb) |
| 940 | break; |
| 941 | bn -= nb; |
| 942 | } |
| 943 | if(j == 0) { |
| 944 | return((daddr_t)0); |
| 945 | } |
| 946 | |
| 947 | /* |
| 948 | * fetch the address from the inode |
| 949 | */ |
| 950 | if((nb = iaddr[NADDR-j]) == 0) { |
| 951 | iaddr[NADDR-j] = nb = balloc(); |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * fetch through the indirect blocks |
| 956 | */ |
| 957 | for(; j<=3; j++) { |
| 958 | dread(nb, (char *)indir, BSIZE); |
| 959 | sh -= NSHIFT; |
| 960 | i = (bn>>sh) & NMASK; |
| 961 | nnb = indir[i]; |
| 962 | if(nnb == 0) { |
| 963 | nnb = balloc(); |
| 964 | indir[i] = nnb; |
| 965 | dwrite(nb, (char *)indir); |
| 966 | } |
| 967 | nb = nnb; |
| 968 | } |
| 969 | return(nb); |
| 970 | } |
| 971 | |
| 972 | /* |
| 973 | * read the tape into buf, then return whether or |
| 974 | * or not it is a header block. |
| 975 | */ |
| 976 | gethead(buf) |
| 977 | struct spcl *buf; |
| 978 | { |
| 979 | readtape((char *)buf); |
| 980 | if (buf->c_magic != MAGIC || checksum((int *) buf) == 0) |
| 981 | return(0); |
| 982 | return(1); |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * return whether or not the buffer contains a header block |
| 987 | */ |
| 988 | ishead(buf) |
| 989 | struct spcl *buf; |
| 990 | { |
| 991 | if (buf->c_magic != MAGIC || checksum((int *) buf) == 0) |
| 992 | return(0); |
| 993 | return(1); |
| 994 | } |
| 995 | |
| 996 | checktype(b, t) |
| 997 | struct spcl *b; |
| 998 | int t; |
| 999 | { |
| 1000 | return(b->c_type == t); |
| 1001 | } |
| 1002 | |
| 1003 | |
| 1004 | checksum(b) |
| 1005 | int *b; |
| 1006 | { |
| 1007 | register i, j; |
| 1008 | |
| 1009 | j = BSIZE/sizeof(int); |
| 1010 | i = 0; |
| 1011 | do |
| 1012 | i += *b++; |
| 1013 | while (--j); |
| 1014 | if (i != CHECKSUM) { |
| 1015 | printf("Checksum error %o\n", i); |
| 1016 | return(0); |
| 1017 | } |
| 1018 | return(1); |
| 1019 | } |
| 1020 | |
| 1021 | checkvol(b, t) |
| 1022 | struct spcl *b; |
| 1023 | int t; |
| 1024 | { |
| 1025 | if (b->c_volume == t) |
| 1026 | return(1); |
| 1027 | return(0); |
| 1028 | } |
| 1029 | |
| 1030 | readhdr(b) |
| 1031 | struct spcl *b; |
| 1032 | { |
| 1033 | if (gethead(b) == 0) |
| 1034 | return(0); |
| 1035 | if (checktype(b, TS_TAPE) == 0) |
| 1036 | return(0); |
| 1037 | return(1); |
| 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * The next routines are called during file extraction to |
| 1042 | * put the data into the right form and place. |
| 1043 | */ |
| 1044 | #ifndef STANDALONE |
| 1045 | xtrfile(b, size) |
| 1046 | char *b; |
| 1047 | long size; |
| 1048 | { |
| 1049 | write(ofile, b, (int) size); |
| 1050 | } |
| 1051 | |
| 1052 | null() {;} |
| 1053 | |
| 1054 | skip() |
| 1055 | { |
| 1056 | lseek(ofile, (long) BSIZE, 1); |
| 1057 | } |
| 1058 | #endif |
| 1059 | |
| 1060 | |
| 1061 | rstrfile(b, s) |
| 1062 | char *b; |
| 1063 | long s; |
| 1064 | { |
| 1065 | daddr_t d; |
| 1066 | |
| 1067 | d = bmap(taddr, curbno); |
| 1068 | dwrite(d, b); |
| 1069 | curbno += 1; |
| 1070 | } |
| 1071 | |
| 1072 | rstrskip(b, s) |
| 1073 | char *b; |
| 1074 | long s; |
| 1075 | { |
| 1076 | curbno += 1; |
| 1077 | } |
| 1078 | |
| 1079 | #ifndef STANDALONE |
| 1080 | putdir(b) |
| 1081 | char *b; |
| 1082 | { |
| 1083 | register struct direct *dp; |
| 1084 | register i; |
| 1085 | |
| 1086 | for (dp = (struct direct *) b, i = 0; i < BSIZE; dp++, i += sizeof(*dp)) { |
| 1087 | if (dp->d_ino == 0) |
| 1088 | continue; |
| 1089 | putent((char *) dp); |
| 1090 | } |
| 1091 | } |
| 1092 | #endif |
| 1093 | |
| 1094 | /* |
| 1095 | * read/write an inode from the disk |
| 1096 | */ |
| 1097 | getdino(inum, b) |
| 1098 | ino_t inum; |
| 1099 | struct dinode *b; |
| 1100 | { |
| 1101 | daddr_t bno; |
| 1102 | char buf[BSIZE]; |
| 1103 | |
| 1104 | bno = (ino - 1)/INOPB; |
| 1105 | bno += 2; |
| 1106 | dread(bno, buf, BSIZE); |
| 1107 | copy(&buf[((inum-1)%INOPB)*sizeof(struct dinode)], (char *) b, sizeof(struct dinode)); |
| 1108 | } |
| 1109 | |
| 1110 | putdino(inum, b) |
| 1111 | ino_t inum; |
| 1112 | struct dinode *b; |
| 1113 | { |
| 1114 | daddr_t bno; |
| 1115 | char buf[BSIZE]; |
| 1116 | |
| 1117 | bno = ((ino - 1)/INOPB) + 2; |
| 1118 | dread(bno, buf, BSIZE); |
| 1119 | copy((char *) b, &buf[((inum-1)%INOPB)*sizeof(struct dinode)], sizeof(struct dinode)); |
| 1120 | dwrite(bno, buf); |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * read a bit mask from the tape into m. |
| 1125 | */ |
| 1126 | readbits(m) |
| 1127 | short *m; |
| 1128 | { |
| 1129 | register i; |
| 1130 | |
| 1131 | i = spcl.c_count; |
| 1132 | |
| 1133 | while (i--) { |
| 1134 | readtape((char *) m); |
| 1135 | m += (BSIZE/(MLEN/BITS)); |
| 1136 | } |
| 1137 | while (gethead(&spcl) == 0) |
| 1138 | ; |
| 1139 | } |
| 1140 | |
| 1141 | done() |
| 1142 | { |
| 1143 | unlink(dirfile); |
| 1144 | exit(0); |
| 1145 | } |