restore.c revision 1.16
1 /* $NetBSD: restore.c,v 1.16 2005/02/17 15:00:33 xtraeme Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)restore.c 8.3 (Berkeley) 9/13/94"; 36 #else 37 __RCSID("$NetBSD: restore.c,v 1.16 2005/02/17 15:00:33 xtraeme Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 44 #include <ufs/ufs/dinode.h> 45 46 #include <stdio.h> 47 #include <string.h> 48 49 #include "restore.h" 50 #include "extern.h" 51 52 static char *keyval(int); 53 54 /* 55 * This implements the 't' option. 56 * List entries on the tape. 57 */ 58 long 59 listfile(char *name, ino_t ino, int type) 60 { 61 long descend = hflag ? GOOD : FAIL; 62 63 if (TSTINO(ino, dumpmap) == 0) 64 return (descend); 65 vprintf(stdout, "%s", type == LEAF ? "leaf" : "dir "); 66 fprintf(stdout, "%10d\t%s\n", ino, name); 67 return (descend); 68 } 69 70 /* 71 * This implements the 'x' option. 72 * Request that new entries be extracted. 73 */ 74 long 75 addfile(char *name, ino_t ino, int type) 76 { 77 struct entry *ep; 78 long descend = hflag ? GOOD : FAIL; 79 char buf[100]; 80 81 if (TSTINO(ino, dumpmap) == 0) { 82 dprintf(stdout, "%s: not on the tape\n", name); 83 return (descend); 84 } 85 if (ino == WINO && command == 'i' && !vflag) 86 return (descend); 87 if (!mflag) { 88 (void) snprintf(buf, sizeof(buf), "./%u", ino); 89 name = buf; 90 if (type == NODE) { 91 (void) genliteraldir(name, ino); 92 return (descend); 93 } 94 } 95 ep = lookupino(ino); 96 if (ep != NULL) { 97 if (strcmp(name, myname(ep)) == 0) { 98 ep->e_flags |= NEW; 99 return (descend); 100 } 101 type |= LINK; 102 } 103 ep = addentry(name, ino, type); 104 if (type == NODE) 105 newnode(ep); 106 ep->e_flags |= NEW; 107 return (descend); 108 } 109 110 /* 111 * This is used by the 'i' option to undo previous requests made by addfile. 112 * Delete entries from the request queue. 113 */ 114 /* ARGSUSED */ 115 long 116 deletefile(char *name, ino_t ino, int type) 117 { 118 long descend = hflag ? GOOD : FAIL; 119 struct entry *ep; 120 121 if (TSTINO(ino, dumpmap) == 0) 122 return (descend); 123 ep = lookupname(name); 124 if (ep != NULL) { 125 ep->e_flags &= ~NEW; 126 ep->e_flags |= REMOVED; 127 if (ep->e_type != NODE) 128 freeentry(ep); 129 } 130 return (descend); 131 } 132 133 /* 134 * The following four routines implement the incremental 135 * restore algorithm. The first removes old entries, the second 136 * does renames and calculates the extraction list, the third 137 * cleans up link names missed by the first two, and the final 138 * one deletes old directories. 139 * 140 * Directories cannot be immediately deleted, as they may have 141 * other files in them which need to be moved out first. As 142 * directories to be deleted are found, they are put on the 143 * following deletion list. After all deletions and renames 144 * are done, this list is actually deleted. 145 */ 146 static struct entry *removelist; 147 148 /* 149 * Remove invalid whiteouts from the old tree. 150 * Remove unneeded leaves from the old tree. 151 * Remove directories from the lookup chains. 152 */ 153 void 154 removeoldleaves(void) 155 { 156 struct entry *ep, *nextep; 157 ino_t i, mydirino; 158 159 vprintf(stdout, "Mark entries to be removed.\n"); 160 if ((ep = lookupino(WINO)) != NULL) { 161 vprintf(stdout, "Delete whiteouts\n"); 162 for ( ; ep != NULL; ep = nextep) { 163 nextep = ep->e_links; 164 mydirino = ep->e_parent->e_ino; 165 /* 166 * We remove all whiteouts that are in directories 167 * that have been removed or that have been dumped. 168 */ 169 if (TSTINO(mydirino, usedinomap) && 170 !TSTINO(mydirino, dumpmap)) 171 continue; 172 delwhiteout(ep); 173 freeentry(ep); 174 } 175 } 176 for (i = ROOTINO + 1; i < maxino; i++) { 177 ep = lookupino(i); 178 if (ep == NULL) 179 continue; 180 if (TSTINO(i, usedinomap)) 181 continue; 182 for ( ; ep != NULL; ep = ep->e_links) { 183 dprintf(stdout, "%s: REMOVE\n", myname(ep)); 184 if (ep->e_type == LEAF) { 185 removeleaf(ep); 186 freeentry(ep); 187 } else { 188 mktempname(ep); 189 deleteino(ep->e_ino); 190 ep->e_next = removelist; 191 removelist = ep; 192 } 193 } 194 } 195 } 196 197 /* 198 * For each directory entry on the incremental tape, determine which 199 * category it falls into as follows: 200 * KEEP - entries that are to be left alone. 201 * NEW - new entries to be added. 202 * EXTRACT - files that must be updated with new contents. 203 * LINK - new links to be added. 204 * Renames are done at the same time. 205 */ 206 long 207 nodeupdates(char *name, ino_t ino, int type) 208 { 209 struct entry *ep, *np, *ip; 210 long descend = GOOD; 211 int lookuptype = 0; 212 int key = 0; 213 /* key values */ 214 # define ONTAPE 0x1 /* inode is on the tape */ 215 # define INOFND 0x2 /* inode already exists */ 216 # define NAMEFND 0x4 /* name already exists */ 217 # define MODECHG 0x8 /* mode of inode changed */ 218 219 /* 220 * This routine is called once for each element in the 221 * directory hierarchy, with a full path name. 222 * The "type" value is incorrectly specified as LEAF for 223 * directories that are not on the dump tape. 224 * 225 * Check to see if the file is on the tape. 226 */ 227 if (TSTINO(ino, dumpmap)) 228 key |= ONTAPE; 229 /* 230 * Check to see if the name exists, and if the name is a link. 231 */ 232 np = lookupname(name); 233 if (np != NULL) { 234 key |= NAMEFND; 235 ip = lookupino(np->e_ino); 236 if (ip == NULL) 237 panic("corrupted symbol table\n"); 238 if (ip != np) 239 lookuptype = LINK; 240 } 241 /* 242 * Check to see if the inode exists, and if one of its links 243 * corresponds to the name (if one was found). 244 */ 245 ip = lookupino(ino); 246 if (ip != NULL) { 247 key |= INOFND; 248 for (ep = ip->e_links; ep != NULL; ep = ep->e_links) { 249 if (ep == np) { 250 ip = ep; 251 break; 252 } 253 } 254 } 255 /* 256 * If both a name and an inode are found, but they do not 257 * correspond to the same file, then both the inode that has 258 * been found and the inode corresponding to the name that 259 * has been found need to be renamed. The current pathname 260 * is the new name for the inode that has been found. Since 261 * all files to be deleted have already been removed, the 262 * named file is either a now unneeded link, or it must live 263 * under a new name in this dump level. If it is a link, it 264 * can be removed. If it is not a link, it is given a 265 * temporary name in anticipation that it will be renamed 266 * when it is later found by inode number. 267 */ 268 if (((key & (INOFND|NAMEFND)) == (INOFND|NAMEFND)) && ip != np) { 269 if (lookuptype == LINK) { 270 removeleaf(np); 271 freeentry(np); 272 } else { 273 dprintf(stdout, "name/inode conflict, mktempname %s\n", 274 myname(np)); 275 mktempname(np); 276 } 277 np = NULL; 278 key &= ~NAMEFND; 279 } 280 if ((key & ONTAPE) && 281 (((key & INOFND) && ip->e_type != type) || 282 ((key & NAMEFND) && np->e_type != type))) 283 key |= MODECHG; 284 285 /* 286 * Decide on the disposition of the file based on its flags. 287 * Note that we have already handled the case in which 288 * a name and inode are found that correspond to different files. 289 * Thus if both NAMEFND and INOFND are set then ip == np. 290 */ 291 switch (key) { 292 293 /* 294 * A previously existing file has been found. 295 * Mark it as KEEP so that other links to the inode can be 296 * detected, and so that it will not be reclaimed by the search 297 * for unreferenced names. 298 */ 299 case INOFND|NAMEFND: 300 ip->e_flags |= KEEP; 301 dprintf(stdout, "[%s] %s: %s\n", keyval(key), name, 302 flagvalues(ip)); 303 break; 304 305 /* 306 * A file on the tape has a name which is the same as a name 307 * corresponding to a different file in the previous dump. 308 * Since all files to be deleted have already been removed, 309 * this file is either a now unneeded link, or it must live 310 * under a new name in this dump level. If it is a link, it 311 * can simply be removed. If it is not a link, it is given a 312 * temporary name in anticipation that it will be renamed 313 * when it is later found by inode number (see INOFND case 314 * below). The entry is then treated as a new file. 315 */ 316 case ONTAPE|NAMEFND: 317 case ONTAPE|NAMEFND|MODECHG: 318 if (lookuptype == LINK) { 319 removeleaf(np); 320 freeentry(np); 321 } else { 322 mktempname(np); 323 } 324 /* fall through */ 325 326 /* 327 * A previously non-existent file. 328 * Add it to the file system, and request its extraction. 329 * If it is a directory, create it immediately. 330 * (Since the name is unused there can be no conflict) 331 */ 332 case ONTAPE: 333 ep = addentry(name, ino, type); 334 if (type == NODE) 335 newnode(ep); 336 ep->e_flags |= NEW|KEEP; 337 dprintf(stdout, "[%s] %s: %s\n", keyval(key), name, 338 flagvalues(ep)); 339 break; 340 341 /* 342 * A file with the same inode number, but a different 343 * name has been found. If the other name has not already 344 * been found (indicated by the KEEP flag, see above) then 345 * this must be a new name for the file, and it is renamed. 346 * If the other name has been found then this must be a 347 * link to the file. Hard links to directories are not 348 * permitted, and are either deleted or converted to 349 * symbolic links. Finally, if the file is on the tape, 350 * a request is made to extract it. 351 */ 352 case ONTAPE|INOFND: 353 if (type == LEAF && (ip->e_flags & KEEP) == 0) 354 ip->e_flags |= EXTRACT; 355 /* fall through */ 356 case INOFND: 357 if ((ip->e_flags & KEEP) == 0) { 358 renameit(myname(ip), name); 359 moveentry(ip, name); 360 ip->e_flags |= KEEP; 361 dprintf(stdout, "[%s] %s: %s\n", keyval(key), name, 362 flagvalues(ip)); 363 break; 364 } 365 if (ip->e_type == NODE) { 366 descend = FAIL; 367 fprintf(stderr, 368 "deleted hard link %s to directory %s\n", 369 name, myname(ip)); 370 break; 371 } 372 ep = addentry(name, ino, type|LINK); 373 ep->e_flags |= NEW; 374 dprintf(stdout, "[%s] %s: %s|LINK\n", keyval(key), name, 375 flagvalues(ep)); 376 break; 377 378 /* 379 * A previously known file which is to be updated. If it is a link, 380 * then all names referring to the previous file must be removed 381 * so that the subset of them that remain can be recreated. 382 */ 383 case ONTAPE|INOFND|NAMEFND: 384 if (lookuptype == LINK) { 385 removeleaf(np); 386 freeentry(np); 387 ep = addentry(name, ino, type|LINK); 388 if (type == NODE) 389 newnode(ep); 390 ep->e_flags |= NEW|KEEP; 391 dprintf(stdout, "[%s] %s: %s|LINK\n", keyval(key), name, 392 flagvalues(ep)); 393 break; 394 } 395 if (type == LEAF && lookuptype != LINK) 396 np->e_flags |= EXTRACT; 397 np->e_flags |= KEEP; 398 dprintf(stdout, "[%s] %s: %s\n", keyval(key), name, 399 flagvalues(np)); 400 break; 401 402 /* 403 * An inode is being reused in a completely different way. 404 * Normally an extract can simply do an "unlink" followed 405 * by a "creat". Here we must do effectively the same 406 * thing. The complications arise because we cannot really 407 * delete a directory since it may still contain files 408 * that we need to rename, so we delete it from the symbol 409 * table, and put it on the list to be deleted eventually. 410 * Conversely if a directory is to be created, it must be 411 * done immediately, rather than waiting until the 412 * extraction phase. 413 */ 414 case ONTAPE|INOFND|MODECHG: 415 case ONTAPE|INOFND|NAMEFND|MODECHG: 416 if (ip->e_flags & KEEP) { 417 badentry(ip, "cannot KEEP and change modes"); 418 break; 419 } 420 if (ip->e_type == LEAF) { 421 /* changing from leaf to node */ 422 for ( ; ip != NULL; ip = ip->e_links) { 423 if (ip->e_type != LEAF) 424 badentry(ip, 425 "NODE and LEAF links to same inode"); 426 removeleaf(ip); 427 freeentry(ip); 428 } 429 ip = addentry(name, ino, type); 430 newnode(ip); 431 } else { 432 /* changing from node to leaf */ 433 if ((ip->e_flags & TMPNAME) == 0) 434 mktempname(ip); 435 deleteino(ip->e_ino); 436 ip->e_next = removelist; 437 removelist = ip; 438 ip = addentry(name, ino, type); 439 } 440 ip->e_flags |= NEW|KEEP; 441 dprintf(stdout, "[%s] %s: %s\n", keyval(key), name, 442 flagvalues(ip)); 443 break; 444 445 /* 446 * A hard link to a diirectory that has been removed. 447 * Ignore it. 448 */ 449 case NAMEFND: 450 dprintf(stdout, "[%s] %s: Extraneous name\n", keyval(key), 451 name); 452 descend = FAIL; 453 break; 454 455 /* 456 * If we find a directory entry for a file that is not on 457 * the tape, then we must have found a file that was created 458 * while the dump was in progress. Since we have no contents 459 * for it, we discard the name knowing that it will be on the 460 * next incremental tape. 461 */ 462 case 0: 463 fprintf(stderr, "%s: (inode %d) not found on tape\n", 464 name, ino); 465 break; 466 467 /* 468 * If any of these arise, something is grievously wrong with 469 * the current state of the symbol table. 470 */ 471 case INOFND|NAMEFND|MODECHG: 472 case NAMEFND|MODECHG: 473 case INOFND|MODECHG: 474 fprintf(stderr, "[%s] %s: inconsistent state\n", keyval(key), 475 name); 476 break; 477 478 /* 479 * These states "cannot" arise for any state of the symbol table. 480 */ 481 case ONTAPE|MODECHG: 482 case MODECHG: 483 default: 484 panic("[%s] %s: impossible state\n", keyval(key), name); 485 break; 486 } 487 return (descend); 488 } 489 490 /* 491 * Calculate the active flags in a key. 492 */ 493 static char * 494 keyval(int key) 495 { 496 static char keybuf[32]; 497 498 (void) strcpy(keybuf, "|NIL"); 499 keybuf[0] = '\0'; 500 if (key & ONTAPE) 501 (void) strcat(keybuf, "|ONTAPE"); 502 if (key & INOFND) 503 (void) strcat(keybuf, "|INOFND"); 504 if (key & NAMEFND) 505 (void) strcat(keybuf, "|NAMEFND"); 506 if (key & MODECHG) 507 (void) strcat(keybuf, "|MODECHG"); 508 return (&keybuf[1]); 509 } 510 511 /* 512 * Find unreferenced link names. 513 */ 514 void 515 findunreflinks(void) 516 { 517 struct entry *ep, *np; 518 ino_t i; 519 520 vprintf(stdout, "Find unreferenced names.\n"); 521 for (i = ROOTINO; i < maxino; i++) { 522 ep = lookupino(i); 523 if (ep == NULL || ep->e_type == LEAF || TSTINO(i, dumpmap) == 0) 524 continue; 525 for (np = ep->e_entries; np != NULL; np = np->e_sibling) { 526 if (np->e_flags == 0) { 527 dprintf(stdout, 528 "%s: remove unreferenced name\n", 529 myname(np)); 530 removeleaf(np); 531 freeentry(np); 532 } 533 } 534 } 535 /* 536 * Any leaves remaining in removed directories is unreferenced. 537 */ 538 for (ep = removelist; ep != NULL; ep = ep->e_next) { 539 for (np = ep->e_entries; np != NULL; np = np->e_sibling) { 540 if (np->e_type == LEAF) { 541 if (np->e_flags != 0) 542 badentry(np, "unreferenced with flags"); 543 dprintf(stdout, 544 "%s: remove unreferenced name\n", 545 myname(np)); 546 removeleaf(np); 547 freeentry(np); 548 } 549 } 550 } 551 } 552 553 /* 554 * Remove old nodes (directories). 555 * Note that this routine runs in O(N*D) where: 556 * N is the number of directory entries to be removed. 557 * D is the maximum depth of the tree. 558 * If N == D this can be quite slow. If the list were 559 * topologically sorted, the deletion could be done in 560 * time O(N). 561 */ 562 void 563 removeoldnodes(void) 564 { 565 struct entry *ep, **prev; 566 long change; 567 568 vprintf(stdout, "Remove old nodes (directories).\n"); 569 do { 570 change = 0; 571 prev = &removelist; 572 for (ep = removelist; ep != NULL; ep = *prev) { 573 if (ep->e_entries != NULL) { 574 prev = &ep->e_next; 575 continue; 576 } 577 *prev = ep->e_next; 578 removenode(ep); 579 freeentry(ep); 580 change++; 581 } 582 } while (change); 583 for (ep = removelist; ep != NULL; ep = ep->e_next) 584 badentry(ep, "cannot remove, non-empty"); 585 } 586 587 /* 588 * This is the routine used to extract files for the 'r' command. 589 * Extract new leaves. 590 */ 591 void 592 createleaves(char *symtabfile) 593 { 594 struct entry *ep; 595 ino_t first; 596 long curvol; 597 598 if (command == 'R') { 599 vprintf(stdout, "Continue extraction of new leaves\n"); 600 } else { 601 vprintf(stdout, "Extract new leaves.\n"); 602 dumpsymtable(symtabfile, volno); 603 } 604 first = lowerbnd(ROOTINO); 605 curvol = volno; 606 while (curfile.ino < maxino) { 607 first = lowerbnd(first); 608 /* 609 * If the next available file is not the one which we 610 * expect then we have missed one or more files. Since 611 * we do not request files that were not on the tape, 612 * the lost files must have been due to a tape read error, 613 * or a file that was removed while the dump was in progress. 614 */ 615 while (first < curfile.ino) { 616 ep = lookupino(first); 617 if (ep == NULL) 618 panic("%d: bad first\n", first); 619 fprintf(stderr, "%s: not found on tape\n", myname(ep)); 620 ep->e_flags &= ~(NEW|EXTRACT); 621 first = lowerbnd(first); 622 } 623 /* 624 * If we find files on the tape that have no corresponding 625 * directory entries, then we must have found a file that 626 * was created while the dump was in progress. Since we have 627 * no name for it, we discard it knowing that it will be 628 * on the next incremental tape. 629 */ 630 if (first != curfile.ino) { 631 fprintf(stderr, "expected next file %d, got %d\n", 632 first, curfile.ino); 633 skipfile(); 634 goto next; 635 } 636 ep = lookupino(curfile.ino); 637 if (ep == NULL) 638 panic("unknown file on tape\n"); 639 if ((ep->e_flags & (NEW|EXTRACT)) == 0) 640 badentry(ep, "unexpected file on tape"); 641 /* 642 * If the file is to be extracted, then the old file must 643 * be removed since its type may change from one leaf type 644 * to another (eg "file" to "character special"). 645 */ 646 if ((ep->e_flags & EXTRACT) != 0) { 647 removeleaf(ep); 648 ep->e_flags &= ~REMOVED; 649 } 650 (void) extractfile(myname(ep)); 651 ep->e_flags &= ~(NEW|EXTRACT); 652 /* 653 * We checkpoint the restore after every tape reel, so 654 * as to simplify the amount of work re quired by the 655 * 'R' command. 656 */ 657 next: 658 if (curvol != volno) { 659 dumpsymtable(symtabfile, volno); 660 skipmaps(); 661 curvol = volno; 662 } 663 } 664 } 665 666 /* 667 * This is the routine used to extract files for the 'x' and 'i' commands. 668 * Efficiently extract a subset of the files on a tape. 669 */ 670 void 671 createfiles(void) 672 { 673 ino_t first, next, last; 674 struct entry *ep; 675 long curvol; 676 677 vprintf(stdout, "Extract requested files\n"); 678 curfile.action = SKIP; 679 getvol((long)1); 680 skipmaps(); 681 skipdirs(); 682 first = lowerbnd(ROOTINO); 683 last = upperbnd(maxino - 1); 684 685 new_volume: 686 /* 687 * Decide on the next inode needed in this volume. 688 */ 689 next = lowerbnd(curfile.ino); 690 for (;;) { 691 first = lowerbnd(first); 692 last = upperbnd(last); 693 /* 694 * Check to see if any files remain to be extracted 695 */ 696 if (first > last) 697 return; 698 /* 699 * Reject any volumes with inodes greater 700 * than the last one needed 701 */ 702 if (curfile.ino > last) { 703 do { 704 curfile.action = SKIP; 705 getvol((long)0); 706 skipmaps(); 707 skipdirs(); 708 } while (curfile.ino > last); 709 goto new_volume; 710 } 711 /* 712 * Skip across the inodes until the next inode is found 713 * or an out of order volume change is encountered 714 */ 715 do { 716 curvol = volno; 717 while (next > curfile.ino && volno == curvol) 718 skipfile(); 719 skipmaps(); 720 skipdirs(); 721 } while (volno == curvol + 1); 722 /* 723 * If volume change out of order occurred the 724 * current state must be recalculated 725 */ 726 if (volno != curvol) 727 goto new_volume; 728 /* 729 * If the current inode is greater than the one we were 730 * looking for then we missed the one we were looking for. 731 * Since we only attempt to extract files listed in the 732 * dump map, the lost files must have been due to a tape 733 * read error, or a file that was removed while the dump 734 * was in progress. Thus we report all requested files 735 * between the one we were looking for, and the one we 736 * found as missing, and delete their request flags. 737 */ 738 while (next < curfile.ino) { 739 ep = lookupino(next); 740 if (ep == NULL) 741 panic("corrupted symbol table\n"); 742 fprintf(stderr, "%s: not found on tape\n", myname(ep)); 743 ep->e_flags &= ~NEW; 744 next = lowerbnd(next); 745 } 746 /* 747 * The current inode is the one that we are looking for, 748 * so extract it per its requested name. 749 */ 750 if (next == curfile.ino && next <= last) { 751 ep = lookupino(next); 752 if (ep == NULL) 753 panic("corrupted symbol table\n"); 754 (void) extractfile(myname(ep)); 755 ep->e_flags &= ~NEW; 756 if (volno != curvol) { 757 skipmaps(); 758 goto new_volume; 759 } 760 /* 761 * Decide the next inode. Note that curfile.ino 762 * already updated to the next file on the tape, 763 * and we can't used it since it may be greater 764 * than `next'. 765 */ 766 next = lowerbnd(next); 767 } 768 } 769 } 770 771 /* 772 * Add links. 773 */ 774 void 775 createlinks(void) 776 { 777 struct entry *np, *ep; 778 ino_t i; 779 char name[BUFSIZ]; 780 781 if ((ep = lookupino(WINO)) != NULL) { 782 vprintf(stdout, "Add whiteouts\n"); 783 for ( ; ep != NULL; ep = ep->e_links) { 784 if ((ep->e_flags & NEW) == 0) 785 continue; 786 (void) addwhiteout(myname(ep)); 787 ep->e_flags &= ~NEW; 788 } 789 } 790 vprintf(stdout, "Add links\n"); 791 for (i = ROOTINO; i < maxino; i++) { 792 ep = lookupino(i); 793 if (ep == NULL) 794 continue; 795 for (np = ep->e_links; np != NULL; np = np->e_links) { 796 if ((np->e_flags & NEW) == 0) 797 continue; 798 (void) strcpy(name, myname(ep)); 799 if (ep->e_type == NODE) { 800 (void) linkit(name, myname(np), SYMLINK); 801 } else { 802 (void) linkit(name, myname(np), HARDLINK); 803 } 804 np->e_flags &= ~NEW; 805 } 806 } 807 } 808 809 /* 810 * Check the symbol table. 811 * We do this to insure that all the requested work was done, and 812 * that no temporary names remain. 813 */ 814 void 815 checkrestore(void) 816 { 817 struct entry *ep; 818 ino_t i; 819 820 vprintf(stdout, "Check the symbol table.\n"); 821 for (i = WINO; i < maxino; i++) { 822 for (ep = lookupino(i); ep != NULL; ep = ep->e_links) { 823 ep->e_flags &= ~KEEP; 824 if (ep->e_type == NODE) 825 ep->e_flags &= ~(NEW|EXISTED); 826 if (ep->e_flags != 0) 827 badentry(ep, "incomplete operations"); 828 } 829 } 830 } 831 832 /* 833 * Compare with the directory structure on the tape 834 * A paranoid check that things are as they should be. 835 */ 836 long 837 verifyfile(char *name, ino_t ino, int type) 838 { 839 struct entry *np, *ep; 840 long descend = GOOD; 841 842 ep = lookupname(name); 843 if (ep == NULL) { 844 fprintf(stderr, "Warning: missing name %s\n", name); 845 return (FAIL); 846 } 847 np = lookupino(ino); 848 if (np != ep) 849 descend = FAIL; 850 for ( ; np != NULL; np = np->e_links) 851 if (np == ep) 852 break; 853 if (np == NULL) 854 panic("missing inumber %d\n", ino); 855 if (ep->e_type == LEAF && type != LEAF) 856 badentry(ep, "type should be LEAF"); 857 return (descend); 858 } 859
Indexes created Sun Oct 19 16:10:00 GMT 2025