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