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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 | /* vi: set sw=4 ts=4: */ /* * inode.c --- utility routines to read and write inodes * * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */ #include <stdio.h> #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #if HAVE_ERRNO_H #include <errno.h> #endif #if HAVE_SYS_STAT_H #include <sys/stat.h> #endif #if HAVE_SYS_TYPES_H #include <sys/types.h> #endif #include "ext2_fs.h" #include "ext2fsP.h" #include "e2image.h" struct ext2_struct_inode_scan { errcode_t magic; ext2_filsys fs; ext2_ino_t current_inode; blk_t current_block; dgrp_t current_group; ext2_ino_t inodes_left; blk_t blocks_left; dgrp_t groups_left; blk_t inode_buffer_blocks; char * inode_buffer; int inode_size; char * ptr; int bytes_left; char *temp_buffer; errcode_t (*done_group)(ext2_filsys fs, dgrp_t group, void * priv_data); void * done_group_data; int bad_block_ptr; int scan_flags; int reserved[6]; }; /* * This routine flushes the icache, if it exists. */ errcode_t ext2fs_flush_icache(ext2_filsys fs) { int i; if (!fs->icache) return 0; for (i=0; i < fs->icache->cache_size; i++) fs->icache->cache[i].ino = 0; fs->icache->buffer_blk = 0; return 0; } static errcode_t create_icache(ext2_filsys fs) { errcode_t retval; if (fs->icache) return 0; retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache); if (retval) return retval; memset(fs->icache, 0, sizeof(struct ext2_inode_cache)); retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer); if (retval) { ext2fs_free_mem(&fs->icache); return retval; } fs->icache->buffer_blk = 0; fs->icache->cache_last = -1; fs->icache->cache_size = 4; fs->icache->refcount = 1; retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache_ent) * fs->icache->cache_size, &fs->icache->cache); if (retval) { ext2fs_free_mem(&fs->icache->buffer); ext2fs_free_mem(&fs->icache); return retval; } ext2fs_flush_icache(fs); return 0; } errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks, ext2_inode_scan *ret_scan) { ext2_inode_scan scan; errcode_t retval; errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks); EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); /* * If fs->badblocks isn't set, then set it --- since the inode * scanning functions require it. */ if (fs->badblocks == 0) { /* * Temporarly save fs->get_blocks and set it to zero, * for compatibility with old e2fsck's. */ save_get_blocks = fs->get_blocks; fs->get_blocks = 0; retval = ext2fs_read_bb_inode(fs, &fs->badblocks); if (retval) { ext2fs_badblocks_list_free(fs->badblocks); fs->badblocks = 0; } fs->get_blocks = save_get_blocks; } retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan); if (retval) return retval; memset(scan, 0, sizeof(struct ext2_struct_inode_scan)); scan->magic = EXT2_ET_MAGIC_INODE_SCAN; scan->fs = fs; scan->inode_size = EXT2_INODE_SIZE(fs->super); scan->bytes_left = 0; scan->current_group = 0; scan->groups_left = fs->group_desc_count - 1; scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8; scan->current_block = scan->fs-> group_desc[scan->current_group].bg_inode_table; scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); scan->blocks_left = scan->fs->inode_blocks_per_group; retval = ext2fs_get_mem((size_t) (scan->inode_buffer_blocks * fs->blocksize), &scan->inode_buffer); scan->done_group = 0; scan->done_group_data = 0; scan->bad_block_ptr = 0; if (retval) { ext2fs_free_mem(&scan); return retval; } retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer); if (retval) { ext2fs_free_mem(&scan->inode_buffer); ext2fs_free_mem(&scan); return retval; } if (scan->fs->badblocks && scan->fs->badblocks->num) scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS; *ret_scan = scan; return 0; } void ext2fs_close_inode_scan(ext2_inode_scan scan) { if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) return; ext2fs_free_mem(&scan->inode_buffer); scan->inode_buffer = NULL; ext2fs_free_mem(&scan->temp_buffer); scan->temp_buffer = NULL; ext2fs_free_mem(&scan); } void ext2fs_set_inode_callback(ext2_inode_scan scan, errcode_t (*done_group)(ext2_filsys fs, dgrp_t group, void * priv_data), void *done_group_data) { if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) return; scan->done_group = done_group; scan->done_group_data = done_group_data; } int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags, int clear_flags) { int old_flags; if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) return 0; old_flags = scan->scan_flags; scan->scan_flags &= ~clear_flags; scan->scan_flags |= set_flags; return old_flags; } /* * This function is called by ext2fs_get_next_inode when it needs to * get ready to read in a new blockgroup. */ static errcode_t get_next_blockgroup(ext2_inode_scan scan) { scan->current_group++; scan->groups_left--; scan->current_block = scan->fs-> group_desc[scan->current_group].bg_inode_table; scan->current_inode = scan->current_group * EXT2_INODES_PER_GROUP(scan->fs->super); scan->bytes_left = 0; scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); scan->blocks_left = scan->fs->inode_blocks_per_group; return 0; } errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan, int group) { scan->current_group = group - 1; scan->groups_left = scan->fs->group_desc_count - group; return get_next_blockgroup(scan); } /* * This function is called by get_next_blocks() to check for bad * blocks in the inode table. * * This function assumes that badblocks_list->list is sorted in * increasing order. */ static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan, blk_t *num_blocks) { blk_t blk = scan->current_block; badblocks_list bb = scan->fs->badblocks; /* * If the inode table is missing, then obviously there are no * bad blocks. :-) */ if (blk == 0) return 0; /* * If the current block is greater than the bad block listed * in the bad block list, then advance the pointer until this * is no longer the case. If we run out of bad blocks, then * we don't need to do any more checking! */ while (blk > bb->list[scan->bad_block_ptr]) { if (++scan->bad_block_ptr >= bb->num) { scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; return 0; } } /* * If the current block is equal to the bad block listed in * the bad block list, then handle that one block specially. * (We could try to handle runs of bad blocks, but that * only increases CPU efficiency by a small amount, at the * expense of a huge expense of code complexity, and for an * uncommon case at that.) */ if (blk == bb->list[scan->bad_block_ptr]) { scan->scan_flags |= EXT2_SF_BAD_INODE_BLK; *num_blocks = 1; if (++scan->bad_block_ptr >= bb->num) scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; return 0; } /* * If there is a bad block in the range that we're about to * read in, adjust the number of blocks to read so that we we * don't read in the bad block. (Then the next block to read * will be the bad block, which is handled in the above case.) */ if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr]) *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk); return 0; } /* * This function is called by ext2fs_get_next_inode when it needs to * read in more blocks from the current blockgroup's inode table. */ static errcode_t get_next_blocks(ext2_inode_scan scan) { blk_t num_blocks; errcode_t retval; /* * Figure out how many blocks to read; we read at most * inode_buffer_blocks, and perhaps less if there aren't that * many blocks left to read. */ num_blocks = scan->inode_buffer_blocks; if (num_blocks > scan->blocks_left) num_blocks = scan->blocks_left; /* * If the past block "read" was a bad block, then mark the * left-over extra bytes as also being bad. */ if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) { if (scan->bytes_left) scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES; scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK; } /* * Do inode bad block processing, if necessary. */ if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) { retval = check_for_inode_bad_blocks(scan, &num_blocks); if (retval) return retval; } if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) || (scan->current_block == 0)) { memset(scan->inode_buffer, 0, (size_t) num_blocks * scan->fs->blocksize); } else { retval = io_channel_read_blk(scan->fs->io, scan->current_block, (int) num_blocks, scan->inode_buffer); if (retval) return EXT2_ET_NEXT_INODE_READ; } scan->ptr = scan->inode_buffer; scan->bytes_left = num_blocks * scan->fs->blocksize; scan->blocks_left -= num_blocks; if (scan->current_block) scan->current_block += num_blocks; return 0; } errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, struct ext2_inode *inode, int bufsize) { errcode_t retval; int extra_bytes = 0; EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); /* * Do we need to start reading a new block group? */ if (scan->inodes_left <= 0) { force_new_group: if (scan->done_group) { retval = (scan->done_group) (scan->fs, scan->current_group, scan->done_group_data); if (retval) return retval; } if (scan->groups_left <= 0) { *ino = 0; return 0; } retval = get_next_blockgroup(scan); if (retval) return retval; } /* * This is done outside the above if statement so that the * check can be done for block group #0. */ if (scan->current_block == 0) { if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) { goto force_new_group; } else return EXT2_ET_MISSING_INODE_TABLE; } /* * Have we run out of space in the inode buffer? If so, we * need to read in more blocks. */ if (scan->bytes_left < scan->inode_size) { memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left); extra_bytes = scan->bytes_left; retval = get_next_blocks(scan); if (retval) return retval; #if 0 /* * XXX test Need check for used inode somehow. * (Note: this is hard.) */ if (is_empty_scan(scan)) goto force_new_group; #endif } retval = 0; if (extra_bytes) { memcpy(scan->temp_buffer+extra_bytes, scan->ptr, scan->inode_size - extra_bytes); scan->ptr += scan->inode_size - extra_bytes; scan->bytes_left -= scan->inode_size - extra_bytes; #if BB_BIG_ENDIAN if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) ext2fs_swap_inode_full(scan->fs, (struct ext2_inode_large *) inode, (struct ext2_inode_large *) scan->temp_buffer, 0, bufsize); else #endif *inode = *((struct ext2_inode *) scan->temp_buffer); if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; } else { #if BB_BIG_ENDIAN if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) ext2fs_swap_inode_full(scan->fs, (struct ext2_inode_large *) inode, (struct ext2_inode_large *) scan->ptr, 0, bufsize); else #endif memcpy(inode, scan->ptr, bufsize); scan->ptr += scan->inode_size; scan->bytes_left -= scan->inode_size; if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; } scan->inodes_left--; scan->current_inode++; *ino = scan->current_inode; return retval; } errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino, struct ext2_inode *inode) { return ext2fs_get_next_inode_full(scan, ino, inode, sizeof(struct ext2_inode)); } /* * Functions to read and write a single inode. */ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode * inode, int bufsize) { unsigned long group, block, block_nr, offset; char *ptr; errcode_t retval; int clen, i, inodes_per_block, length; io_channel io; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); /* Check to see if user has an override function */ if (fs->read_inode) { retval = (fs->read_inode)(fs, ino, inode); if (retval != EXT2_ET_CALLBACK_NOTHANDLED) return retval; } /* Create inode cache if not present */ if (!fs->icache) { retval = create_icache(fs); if (retval) return retval; } /* Check to see if it's in the inode cache */ if (bufsize == sizeof(struct ext2_inode)) { /* only old good inode can be retrieve from the cache */ for (i=0; i < fs->icache->cache_size; i++) { if (fs->icache->cache[i].ino == ino) { *inode = fs->icache->cache[i].inode; return 0; } } } if ((ino == 0) || (ino > fs->super->s_inodes_count)) return EXT2_ET_BAD_INODE_NUM; if (fs->flags & EXT2_FLAG_IMAGE_FILE) { inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super); block_nr = fs->image_header->offset_inode / fs->blocksize; block_nr += (ino - 1) / inodes_per_block; offset = ((ino - 1) % inodes_per_block) * EXT2_INODE_SIZE(fs->super); io = fs->image_io; } else { group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * EXT2_INODE_SIZE(fs->super); block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); if (!fs->group_desc[(unsigned)group].bg_inode_table) return EXT2_ET_MISSING_INODE_TABLE; block_nr = fs->group_desc[(unsigned)group].bg_inode_table + block; io = fs->io; } offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); length = EXT2_INODE_SIZE(fs->super); if (bufsize < length) length = bufsize; ptr = (char *) inode; while (length) { clen = length; if ((offset + length) > fs->blocksize) clen = fs->blocksize - offset; if (block_nr != fs->icache->buffer_blk) { retval = io_channel_read_blk(io, block_nr, 1, fs->icache->buffer); if (retval) return retval; fs->icache->buffer_blk = block_nr; } memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset, clen); offset = 0; length -= clen; ptr += clen; block_nr++; } #if BB_BIG_ENDIAN if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, (struct ext2_inode_large *) inode, 0, length); #endif /* Update the inode cache */ fs->icache->cache_last = (fs->icache->cache_last + 1) % fs->icache->cache_size; fs->icache->cache[fs->icache->cache_last].ino = ino; fs->icache->cache[fs->icache->cache_last].inode = *inode; return 0; } errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode * inode) { return ext2fs_read_inode_full(fs, ino, inode, sizeof(struct ext2_inode)); } errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode * inode, int bufsize) { unsigned long group, block, block_nr, offset; errcode_t retval = 0; struct ext2_inode_large temp_inode, *w_inode; char *ptr; int clen, i, length; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); /* Check to see if user provided an override function */ if (fs->write_inode) { retval = (fs->write_inode)(fs, ino, inode); if (retval != EXT2_ET_CALLBACK_NOTHANDLED) return retval; } /* Check to see if the inode cache needs to be updated */ if (fs->icache) { for (i=0; i < fs->icache->cache_size; i++) { if (fs->icache->cache[i].ino == ino) { fs->icache->cache[i].inode = *inode; break; } } } else { retval = create_icache(fs); if (retval) return retval; } if (!(fs->flags & EXT2_FLAG_RW)) return EXT2_ET_RO_FILSYS; if ((ino == 0) || (ino > fs->super->s_inodes_count)) return EXT2_ET_BAD_INODE_NUM; length = bufsize; if (length < EXT2_INODE_SIZE(fs->super)) length = EXT2_INODE_SIZE(fs->super); if (length > (int) sizeof(struct ext2_inode_large)) { w_inode = xmalloc(length); } else w_inode = &temp_inode; memset(w_inode, 0, length); #if BB_BIG_ENDIAN if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) ext2fs_swap_inode_full(fs, w_inode, (struct ext2_inode_large *) inode, 1, bufsize); else #endif memcpy(w_inode, inode, bufsize); group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * EXT2_INODE_SIZE(fs->super); block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); if (!fs->group_desc[(unsigned) group].bg_inode_table) return EXT2_ET_MISSING_INODE_TABLE; block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block; offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); length = EXT2_INODE_SIZE(fs->super); if (length > bufsize) length = bufsize; ptr = (char *) w_inode; while (length) { clen = length; if ((offset + length) > fs->blocksize) clen = fs->blocksize - offset; if (fs->icache->buffer_blk != block_nr) { retval = io_channel_read_blk(fs->io, block_nr, 1, fs->icache->buffer); if (retval) goto errout; fs->icache->buffer_blk = block_nr; } memcpy((char *) fs->icache->buffer + (unsigned) offset, ptr, clen); retval = io_channel_write_blk(fs->io, block_nr, 1, fs->icache->buffer); if (retval) goto errout; offset = 0; ptr += clen; length -= clen; block_nr++; } fs->flags |= EXT2_FLAG_CHANGED; errout: if (w_inode && w_inode != &temp_inode) free(w_inode); return retval; } errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode) { return ext2fs_write_inode_full(fs, ino, inode, sizeof(struct ext2_inode)); } /* * This function should be called when writing a new inode. It makes * sure that extra part of large inodes is initialized properly. */ errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode) { struct ext2_inode *buf; int size = EXT2_INODE_SIZE(fs->super); struct ext2_inode_large *large_inode; if (size == sizeof(struct ext2_inode)) return ext2fs_write_inode_full(fs, ino, inode, sizeof(struct ext2_inode)); buf = xmalloc(size); memset(buf, 0, size); *buf = *inode; large_inode = (struct ext2_inode_large *) buf; large_inode->i_extra_isize = sizeof(struct ext2_inode_large) - EXT2_GOOD_OLD_INODE_SIZE; return ext2fs_write_inode_full(fs, ino, buf, size); } errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks) { struct ext2_inode inode; int i; errcode_t retval; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); if (ino > fs->super->s_inodes_count) return EXT2_ET_BAD_INODE_NUM; if (fs->get_blocks) { if (!(*fs->get_blocks)(fs, ino, blocks)) return 0; } retval = ext2fs_read_inode(fs, ino, &inode); if (retval) return retval; for (i=0; i < EXT2_N_BLOCKS; i++) blocks[i] = inode.i_block[i]; return 0; } errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino) { struct ext2_inode inode; errcode_t retval; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); if (ino > fs->super->s_inodes_count) return EXT2_ET_BAD_INODE_NUM; if (fs->check_directory) { retval = (fs->check_directory)(fs, ino); if (retval != EXT2_ET_CALLBACK_NOTHANDLED) return retval; } retval = ext2fs_read_inode(fs, ino, &inode); if (retval) return retval; if (!LINUX_S_ISDIR(inode.i_mode)) return EXT2_ET_NO_DIRECTORY; return 0; } |