1 /*- 2 * Copyright (c) 1980, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)traverse.c 8.1 (Berkeley) 06/05/93"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/time.h> 14 #include <sys/stat.h> 15 #ifdef sunos 16 #include <sys/vnode.h> 17 18 #include <ufs/fs.h> 19 #include <ufs/fsdir.h> 20 #include <ufs/inode.h> 21 #else 22 #include <ufs/ffs/fs.h> 23 #include <ufs/ufs/dir.h> 24 #include <ufs/ufs/dinode.h> 25 #endif 26 27 #include <protocols/dumprestore.h> 28 29 #include <ctype.h> 30 #include <stdio.h> 31 #ifdef __STDC__ 32 #include <string.h> 33 #include <unistd.h> 34 #endif 35 36 #include "dump.h" 37 38 #define HASDUMPEDFILE 0x1 39 #define HASSUBDIRS 0x2 40 41 #ifdef FS_44INODEFMT 42 typedef quad_t fsizeT; 43 #else 44 typedef long fsizeT; 45 #endif 46 47 static int dirindir __P((ino_t ino, daddr_t blkno, int level, long *size)); 48 static void dmpindir __P((ino_t ino, daddr_t blk, int level, fsizeT *size)); 49 static int searchdir __P((ino_t ino, daddr_t blkno, long size, long filesize)); 50 51 /* 52 * This is an estimation of the number of TP_BSIZE blocks in the file. 53 * It estimates the number of blocks in files with holes by assuming 54 * that all of the blocks accounted for by di_blocks are data blocks 55 * (when some of the blocks are usually used for indirect pointers); 56 * hence the estimate may be high. 57 */ 58 long 59 blockest(dp) 60 register struct dinode *dp; 61 { 62 long blkest, sizeest; 63 64 /* 65 * dp->di_size is the size of the file in bytes. 66 * dp->di_blocks stores the number of sectors actually in the file. 67 * If there are more sectors than the size would indicate, this just 68 * means that there are indirect blocks in the file or unused 69 * sectors in the last file block; we can safely ignore these 70 * (blkest = sizeest below). 71 * If the file is bigger than the number of sectors would indicate, 72 * then the file has holes in it. In this case we must use the 73 * block count to estimate the number of data blocks used, but 74 * we use the actual size for estimating the number of indirect 75 * dump blocks (sizeest vs. blkest in the indirect block 76 * calculation). 77 */ 78 blkest = howmany(dbtob(dp->di_blocks), TP_BSIZE); 79 sizeest = howmany(dp->di_size, TP_BSIZE); 80 if (blkest > sizeest) 81 blkest = sizeest; 82 if (dp->di_size > sblock->fs_bsize * NDADDR) { 83 /* calculate the number of indirect blocks on the dump tape */ 84 blkest += 85 howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE, 86 TP_NINDIR); 87 } 88 return (blkest + 1); 89 } 90 91 /* Auxiliary macro to pick up files changed since previous dump. */ 92 #ifdef FS_44INODEFMT 93 #define CHANGEDSINCE(dp, t) \ 94 ((dp)->di_mtime.ts_sec >= (t) || (dp)->di_ctime.ts_sec >= (t)) 95 #else 96 #define CHANGEDSINCE(dp, t) \ 97 ((dp)->di_mtime >= (t) || (dp)->di_ctime >= (t)) 98 #endif 99 100 /* The WANTTODUMP macro decides whether a file should be dumped. */ 101 #ifdef UF_NODUMP 102 #define WANTTODUMP(dp) \ 103 (CHANGEDSINCE(dp, spcl.c_ddate) && \ 104 (nonodump || ((dp)->di_flags & UF_NODUMP) != UF_NODUMP)) 105 #else 106 #define WANTTODUMP(dp) CHANGEDSINCE(dp, spcl.c_ddate) 107 #endif 108 109 /* 110 * Dump pass 1. 111 * 112 * Walk the inode list for a filesystem to find all allocated inodes 113 * that have been modified since the previous dump time. Also, find all 114 * the directories in the filesystem. 115 */ 116 int 117 mapfiles(maxino, tapesize) 118 ino_t maxino; 119 long *tapesize; 120 { 121 register int mode; 122 register ino_t ino; 123 register struct dinode *dp; 124 int anydirskipped = 0; 125 126 for (ino = ROOTINO; ino < maxino; ino++) { 127 dp = getino(ino); 128 if ((mode = (dp->di_mode & IFMT)) == 0) 129 continue; 130 SETINO(ino, usedinomap); 131 if (mode == IFDIR) 132 SETINO(ino, dumpdirmap); 133 if (WANTTODUMP(dp)) { 134 SETINO(ino, dumpinomap); 135 if (mode != IFREG && mode != IFDIR && mode != IFLNK) 136 *tapesize += 1; 137 else 138 *tapesize += blockest(dp); 139 continue; 140 } 141 if (mode == IFDIR) 142 anydirskipped = 1; 143 } 144 /* 145 * Restore gets very upset if the root is not dumped, 146 * so ensure that it always is dumped. 147 */ 148 SETINO(ROOTINO, dumpinomap); 149 return (anydirskipped); 150 } 151 152 /* 153 * Dump pass 2. 154 * 155 * Scan each directory on the filesystem to see if it has any modified 156 * files in it. If it does, and has not already been added to the dump 157 * list (because it was itself modified), then add it. If a directory 158 * has not been modified itself, contains no modified files and has no 159 * subdirectories, then it can be deleted from the dump list and from 160 * the list of directories. By deleting it from the list of directories, 161 * its parent may now qualify for the same treatment on this or a later 162 * pass using this algorithm. 163 */ 164 int 165 mapdirs(maxino, tapesize) 166 ino_t maxino; 167 long *tapesize; 168 { 169 register struct dinode *dp; 170 register int i, isdir; 171 register char *map; 172 register ino_t ino; 173 long filesize; 174 int ret, change = 0; 175 176 isdir = 0; /* XXX just to get gcc to shut up */ 177 for (map = dumpdirmap, ino = 1; ino < maxino; ino++) { 178 if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */ 179 isdir = *map++; 180 else 181 isdir >>= 1; 182 if ((isdir & 1) == 0 || TSTINO(ino, dumpinomap)) 183 continue; 184 dp = getino(ino); 185 filesize = dp->di_size; 186 for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) { 187 if (dp->di_db[i] != 0) 188 ret |= searchdir(ino, dp->di_db[i], 189 (long)dblksize(sblock, dp, i), 190 filesize); 191 if (ret & HASDUMPEDFILE) 192 filesize = 0; 193 else 194 filesize -= sblock->fs_bsize; 195 } 196 for (i = 0; filesize > 0 && i < NIADDR; i++) { 197 if (dp->di_ib[i] == 0) 198 continue; 199 ret |= dirindir(ino, dp->di_ib[i], i, &filesize); 200 } 201 if (ret & HASDUMPEDFILE) { 202 SETINO(ino, dumpinomap); 203 *tapesize += blockest(dp); 204 change = 1; 205 continue; 206 } 207 if ((ret & HASSUBDIRS) == 0) { 208 if (!TSTINO(ino, dumpinomap)) { 209 CLRINO(ino, dumpdirmap); 210 change = 1; 211 } 212 } 213 } 214 return (change); 215 } 216 217 /* 218 * Read indirect blocks, and pass the data blocks to be searched 219 * as directories. Quit as soon as any entry is found that will 220 * require the directory to be dumped. 221 */ 222 static int 223 dirindir(ino, blkno, ind_level, filesize) 224 ino_t ino; 225 daddr_t blkno; 226 int ind_level; 227 long *filesize; 228 { 229 int ret = 0; 230 register int i; 231 daddr_t idblk[MAXNINDIR]; 232 233 bread(fsbtodb(sblock, blkno), (char *)idblk, (int)sblock->fs_bsize); 234 if (ind_level <= 0) { 235 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) { 236 blkno = idblk[i]; 237 if (blkno != 0) 238 ret |= searchdir(ino, blkno, sblock->fs_bsize, 239 *filesize); 240 if (ret & HASDUMPEDFILE) 241 *filesize = 0; 242 else 243 *filesize -= sblock->fs_bsize; 244 } 245 return (ret); 246 } 247 ind_level--; 248 for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) { 249 blkno = idblk[i]; 250 if (blkno != 0) 251 ret |= dirindir(ino, blkno, ind_level, filesize); 252 } 253 return (ret); 254 } 255 256 /* 257 * Scan a disk block containing directory information looking to see if 258 * any of the entries are on the dump list and to see if the directory 259 * contains any subdirectories. 260 */ 261 static int 262 searchdir(ino, blkno, size, filesize) 263 ino_t ino; 264 daddr_t blkno; 265 register long size; 266 long filesize; 267 { 268 register struct direct *dp; 269 register long loc, ret = 0; 270 char dblk[MAXBSIZE]; 271 272 bread(fsbtodb(sblock, blkno), dblk, (int)size); 273 if (filesize < size) 274 size = filesize; 275 for (loc = 0; loc < size; ) { 276 dp = (struct direct *)(dblk + loc); 277 if (dp->d_reclen == 0) { 278 msg("corrupted directory, inumber %d\n", ino); 279 break; 280 } 281 loc += dp->d_reclen; 282 if (dp->d_ino == 0) 283 continue; 284 if (dp->d_name[0] == '.') { 285 if (dp->d_name[1] == '\0') 286 continue; 287 if (dp->d_name[1] == '.' && dp->d_name[2] == '\0') 288 continue; 289 } 290 if (TSTINO(dp->d_ino, dumpinomap)) { 291 ret |= HASDUMPEDFILE; 292 if (ret & HASSUBDIRS) 293 break; 294 } 295 if (TSTINO(dp->d_ino, dumpdirmap)) { 296 ret |= HASSUBDIRS; 297 if (ret & HASDUMPEDFILE) 298 break; 299 } 300 } 301 return (ret); 302 } 303 304 /* 305 * Dump passes 3 and 4. 306 * 307 * Dump the contents of an inode to tape. 308 */ 309 void 310 dumpino(dp, ino) 311 register struct dinode *dp; 312 ino_t ino; 313 { 314 int ind_level, cnt; 315 fsizeT size; 316 char buf[TP_BSIZE]; 317 318 if (newtape) { 319 newtape = 0; 320 dumpmap(dumpinomap, TS_BITS, ino); 321 } 322 CLRINO(ino, dumpinomap); 323 spcl.c_dinode = *dp; 324 spcl.c_type = TS_INODE; 325 spcl.c_count = 0; 326 switch (dp->di_mode & S_IFMT) { 327 328 case 0: 329 /* 330 * Freed inode. 331 */ 332 return; 333 334 case S_IFLNK: 335 /* 336 * Check for short symbolic link. 337 */ 338 #ifdef FS_44INODEFMT 339 if (dp->di_size > 0 && 340 dp->di_size < sblock->fs_maxsymlinklen) { 341 spcl.c_addr[0] = 1; 342 spcl.c_count = 1; 343 writeheader(ino); 344 bcopy((caddr_t)dp->di_shortlink, buf, 345 (u_long)dp->di_size); 346 buf[dp->di_size] = '\0'; 347 writerec(buf, 0); 348 return; 349 } 350 #endif 351 /* fall through */ 352 353 case S_IFDIR: 354 case S_IFREG: 355 if (dp->di_size > 0) 356 break; 357 /* fall through */ 358 359 case S_IFIFO: 360 case S_IFSOCK: 361 case S_IFCHR: 362 case S_IFBLK: 363 writeheader(ino); 364 return; 365 366 default: 367 msg("Warning: undefined file type 0%o\n", dp->di_mode & IFMT); 368 return; 369 } 370 if (dp->di_size > NDADDR * sblock->fs_bsize) 371 cnt = NDADDR * sblock->fs_frag; 372 else 373 cnt = howmany(dp->di_size, sblock->fs_fsize); 374 blksout(&dp->di_db[0], cnt, ino); 375 if ((size = dp->di_size - NDADDR * sblock->fs_bsize) <= 0) 376 return; 377 for (ind_level = 0; ind_level < NIADDR; ind_level++) { 378 dmpindir(ino, dp->di_ib[ind_level], ind_level, &size); 379 if (size <= 0) 380 return; 381 } 382 } 383 384 /* 385 * Read indirect blocks, and pass the data blocks to be dumped. 386 */ 387 static void 388 dmpindir(ino, blk, ind_level, size) 389 ino_t ino; 390 daddr_t blk; 391 int ind_level; 392 fsizeT *size; 393 { 394 int i, cnt; 395 daddr_t idblk[MAXNINDIR]; 396 397 if (blk != 0) 398 bread(fsbtodb(sblock, blk), (char *)idblk, (int) sblock->fs_bsize); 399 else 400 bzero((char *)idblk, (int)sblock->fs_bsize); 401 if (ind_level <= 0) { 402 if (*size < NINDIR(sblock) * sblock->fs_bsize) 403 cnt = howmany(*size, sblock->fs_fsize); 404 else 405 cnt = NINDIR(sblock) * sblock->fs_frag; 406 *size -= NINDIR(sblock) * sblock->fs_bsize; 407 blksout(&idblk[0], cnt, ino); 408 return; 409 } 410 ind_level--; 411 for (i = 0; i < NINDIR(sblock); i++) { 412 dmpindir(ino, idblk[i], ind_level, size); 413 if (*size <= 0) 414 return; 415 } 416 } 417 418 /* 419 * Collect up the data into tape record sized buffers and output them. 420 */ 421 void 422 blksout(blkp, frags, ino) 423 daddr_t *blkp; 424 int frags; 425 ino_t ino; 426 { 427 register daddr_t *bp; 428 int i, j, count, blks, tbperdb; 429 430 blks = howmany(frags * sblock->fs_fsize, TP_BSIZE); 431 tbperdb = sblock->fs_bsize >> tp_bshift; 432 for (i = 0; i < blks; i += TP_NINDIR) { 433 if (i + TP_NINDIR > blks) 434 count = blks; 435 else 436 count = i + TP_NINDIR; 437 for (j = i; j < count; j++) 438 if (blkp[j / tbperdb] != 0) 439 spcl.c_addr[j - i] = 1; 440 else 441 spcl.c_addr[j - i] = 0; 442 spcl.c_count = count - i; 443 writeheader(ino); 444 bp = &blkp[i / tbperdb]; 445 for (j = i; j < count; j += tbperdb, bp++) 446 if (*bp != 0) 447 if (j + tbperdb <= count) 448 dumpblock(*bp, (int)sblock->fs_bsize); 449 else 450 dumpblock(*bp, (count - j) * TP_BSIZE); 451 spcl.c_type = TS_ADDR; 452 } 453 } 454 455 /* 456 * Dump a map to the tape. 457 */ 458 void 459 dumpmap(map, type, ino) 460 char *map; 461 int type; 462 ino_t ino; 463 { 464 register int i; 465 char *cp; 466 467 spcl.c_type = type; 468 spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE); 469 writeheader(ino); 470 for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE) 471 writerec(cp, 0); 472 } 473 474 /* 475 * Write a header record to the dump tape. 476 */ 477 void 478 writeheader(ino) 479 ino_t ino; 480 { 481 register long sum, cnt, *lp; 482 483 spcl.c_inumber = ino; 484 spcl.c_magic = NFS_MAGIC; 485 spcl.c_checksum = 0; 486 lp = (long *)&spcl; 487 sum = 0; 488 cnt = sizeof(union u_spcl) / (4 * sizeof(long)); 489 while (--cnt >= 0) { 490 sum += *lp++; 491 sum += *lp++; 492 sum += *lp++; 493 sum += *lp++; 494 } 495 spcl.c_checksum = CHECKSUM - sum; 496 writerec((char *)&spcl, 1); 497 } 498 499 struct dinode * 500 getino(inum) 501 ino_t inum; 502 { 503 static daddr_t minino, maxino; 504 static struct dinode inoblock[MAXINOPB]; 505 506 curino = inum; 507 if (inum >= minino && inum < maxino) 508 return (&inoblock[inum - minino]); 509 bread(fsbtodb(sblock, itod(sblock, inum)), (char *)inoblock, 510 (int)sblock->fs_bsize); 511 minino = inum - (inum % INOPB(sblock)); 512 maxino = minino + INOPB(sblock); 513 return (&inoblock[inum - minino]); 514 } 515 516 /* 517 * Read a chunk of data from the disk. 518 * Try to recover from hard errors by reading in sector sized pieces. 519 * Error recovery is attempted at most BREADEMAX times before seeking 520 * consent from the operator to continue. 521 */ 522 int breaderrors = 0; 523 #define BREADEMAX 32 524 525 void 526 bread(blkno, buf, size) 527 daddr_t blkno; 528 char *buf; 529 int size; 530 { 531 int cnt, i; 532 extern int errno; 533 534 loop: 535 if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0) 536 msg("bread: lseek fails\n"); 537 if ((cnt = read(diskfd, buf, size)) == size) 538 return; 539 if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) { 540 /* 541 * Trying to read the final fragment. 542 * 543 * NB - dump only works in TP_BSIZE blocks, hence 544 * rounds `dev_bsize' fragments up to TP_BSIZE pieces. 545 * It should be smarter about not actually trying to 546 * read more than it can get, but for the time being 547 * we punt and scale back the read only when it gets 548 * us into trouble. (mkm 9/25/83) 549 */ 550 size -= dev_bsize; 551 goto loop; 552 } 553 if (cnt == -1) 554 msg("read error from %s: %s: [block %d]: count=%d\n", 555 disk, strerror(errno), blkno, size); 556 else 557 msg("short read error from %s: [block %d]: count=%d, got=%d\n", 558 disk, blkno, size, cnt); 559 if (++breaderrors > BREADEMAX) { 560 msg("More than %d block read errors from %d\n", 561 BREADEMAX, disk); 562 broadcast("DUMP IS AILING!\n"); 563 msg("This is an unrecoverable error.\n"); 564 if (!query("Do you want to attempt to continue?")){ 565 dumpabort(0); 566 /*NOTREACHED*/ 567 } else 568 breaderrors = 0; 569 } 570 /* 571 * Zero buffer, then try to read each sector of buffer separately. 572 */ 573 bzero(buf, size); 574 for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) { 575 if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0) 576 msg("bread: lseek2 fails!\n"); 577 if ((cnt = read(diskfd, buf, (int)dev_bsize)) == dev_bsize) 578 continue; 579 if (cnt == -1) { 580 msg("read error from %s: %s: [sector %d]: count=%d\n", 581 disk, strerror(errno), blkno, dev_bsize); 582 continue; 583 } 584 msg("short read error from %s: [sector %d]: count=%d, got=%d\n", 585 disk, blkno, dev_bsize, cnt); 586 } 587 } 588