inode.c revision 030970ed750b6a169c32ffb8b19bce3150198629
1/* 2 * inode.c --- utility routines to read and write inodes 3 * 4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 */ 11 12#include <stdio.h> 13#include <string.h> 14#if HAVE_UNISTD_H 15#include <unistd.h> 16#endif 17#if HAVE_ERRNO_H 18#include <errno.h> 19#endif 20#if HAVE_SYS_STAT_H 21#include <sys/stat.h> 22#endif 23#if HAVE_SYS_TYPES_H 24#include <sys/types.h> 25#endif 26 27#include "ext2_fs.h" 28#include "ext2fsP.h" 29#include "e2image.h" 30 31struct ext2_struct_inode_scan { 32 errcode_t magic; 33 ext2_filsys fs; 34 ext2_ino_t current_inode; 35 blk_t current_block; 36 dgrp_t current_group; 37 ext2_ino_t inodes_left; 38 blk_t blocks_left; 39 dgrp_t groups_left; 40 blk_t inode_buffer_blocks; 41 char * inode_buffer; 42 int inode_size; 43 char * ptr; 44 int bytes_left; 45 char *temp_buffer; 46 errcode_t (*done_group)(ext2_filsys fs, 47 ext2_inode_scan scan, 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 && fs->badblocks) { 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 return; 182} 183 184void ext2fs_set_inode_callback(ext2_inode_scan scan, 185 errcode_t (*done_group)(ext2_filsys fs, 186 ext2_inode_scan scan, 187 dgrp_t group, 188 void * priv_data), 189 void *done_group_data) 190{ 191 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) 192 return; 193 194 scan->done_group = done_group; 195 scan->done_group_data = done_group_data; 196} 197 198int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags, 199 int clear_flags) 200{ 201 int old_flags; 202 203 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) 204 return 0; 205 206 old_flags = scan->scan_flags; 207 scan->scan_flags &= ~clear_flags; 208 scan->scan_flags |= set_flags; 209 return old_flags; 210} 211 212/* 213 * This function is called by ext2fs_get_next_inode when it needs to 214 * get ready to read in a new blockgroup. 215 */ 216static errcode_t get_next_blockgroup(ext2_inode_scan scan) 217{ 218 scan->current_group++; 219 scan->groups_left--; 220 221 scan->current_block = scan->fs-> 222 group_desc[scan->current_group].bg_inode_table; 223 224 scan->current_inode = scan->current_group * 225 EXT2_INODES_PER_GROUP(scan->fs->super); 226 227 scan->bytes_left = 0; 228 scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); 229 scan->blocks_left = scan->fs->inode_blocks_per_group; 230 return 0; 231} 232 233errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan, 234 int group) 235{ 236 scan->current_group = group - 1; 237 scan->groups_left = scan->fs->group_desc_count - group; 238 return get_next_blockgroup(scan); 239} 240 241/* 242 * This function is called by get_next_blocks() to check for bad 243 * blocks in the inode table. 244 * 245 * This function assumes that badblocks_list->list is sorted in 246 * increasing order. 247 */ 248static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan, 249 blk_t *num_blocks) 250{ 251 blk_t blk = scan->current_block; 252 badblocks_list bb = scan->fs->badblocks; 253 254 /* 255 * If the inode table is missing, then obviously there are no 256 * bad blocks. :-) 257 */ 258 if (blk == 0) 259 return 0; 260 261 /* 262 * If the current block is greater than the bad block listed 263 * in the bad block list, then advance the pointer until this 264 * is no longer the case. If we run out of bad blocks, then 265 * we don't need to do any more checking! 266 */ 267 while (blk > bb->list[scan->bad_block_ptr]) { 268 if (++scan->bad_block_ptr >= bb->num) { 269 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; 270 return 0; 271 } 272 } 273 274 /* 275 * If the current block is equal to the bad block listed in 276 * the bad block list, then handle that one block specially. 277 * (We could try to handle runs of bad blocks, but that 278 * only increases CPU efficiency by a small amount, at the 279 * expense of a huge expense of code complexity, and for an 280 * uncommon case at that.) 281 */ 282 if (blk == bb->list[scan->bad_block_ptr]) { 283 scan->scan_flags |= EXT2_SF_BAD_INODE_BLK; 284 *num_blocks = 1; 285 if (++scan->bad_block_ptr >= bb->num) 286 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; 287 return 0; 288 } 289 290 /* 291 * If there is a bad block in the range that we're about to 292 * read in, adjust the number of blocks to read so that we we 293 * don't read in the bad block. (Then the next block to read 294 * will be the bad block, which is handled in the above case.) 295 */ 296 if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr]) 297 *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk); 298 299 return 0; 300} 301 302/* 303 * This function is called by ext2fs_get_next_inode when it needs to 304 * read in more blocks from the current blockgroup's inode table. 305 */ 306static errcode_t get_next_blocks(ext2_inode_scan scan) 307{ 308 blk_t num_blocks; 309 errcode_t retval; 310 311 /* 312 * Figure out how many blocks to read; we read at most 313 * inode_buffer_blocks, and perhaps less if there aren't that 314 * many blocks left to read. 315 */ 316 num_blocks = scan->inode_buffer_blocks; 317 if (num_blocks > scan->blocks_left) 318 num_blocks = scan->blocks_left; 319 320 /* 321 * If the past block "read" was a bad block, then mark the 322 * left-over extra bytes as also being bad. 323 */ 324 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) { 325 if (scan->bytes_left) 326 scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES; 327 scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK; 328 } 329 330 /* 331 * Do inode bad block processing, if necessary. 332 */ 333 if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) { 334 retval = check_for_inode_bad_blocks(scan, &num_blocks); 335 if (retval) 336 return retval; 337 } 338 339 if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) || 340 (scan->current_block == 0)) { 341 memset(scan->inode_buffer, 0, 342 (size_t) num_blocks * scan->fs->blocksize); 343 } else { 344 retval = io_channel_read_blk(scan->fs->io, 345 scan->current_block, 346 (int) num_blocks, 347 scan->inode_buffer); 348 if (retval) 349 return EXT2_ET_NEXT_INODE_READ; 350 } 351 scan->ptr = scan->inode_buffer; 352 scan->bytes_left = num_blocks * scan->fs->blocksize; 353 354 scan->blocks_left -= num_blocks; 355 if (scan->current_block) 356 scan->current_block += num_blocks; 357 return 0; 358} 359 360#if 0 361/* 362 * Returns 1 if the entire inode_buffer has a non-zero size and 363 * contains all zeros. (Not just deleted inodes, since that means 364 * that part of the inode table was used at one point; we want all 365 * zeros, which means that the inode table is pristine.) 366 */ 367static inline int is_empty_scan(ext2_inode_scan scan) 368{ 369 int i; 370 371 if (scan->bytes_left == 0) 372 return 0; 373 374 for (i=0; i < scan->bytes_left; i++) 375 if (scan->ptr[i]) 376 return 0; 377 return 1; 378} 379#endif 380 381errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, 382 struct ext2_inode *inode, int bufsize) 383{ 384 errcode_t retval; 385 int extra_bytes = 0; 386 387 EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); 388 389 /* 390 * Do we need to start reading a new block group? 391 */ 392 if (scan->inodes_left <= 0) { 393 force_new_group: 394 if (scan->done_group) { 395 retval = (scan->done_group) 396 (scan->fs, scan, scan->current_group, 397 scan->done_group_data); 398 if (retval) 399 return retval; 400 } 401 if (scan->groups_left <= 0) { 402 *ino = 0; 403 return 0; 404 } 405 retval = get_next_blockgroup(scan); 406 if (retval) 407 return retval; 408 } 409 /* 410 * This is done outside the above if statement so that the 411 * check can be done for block group #0. 412 */ 413 if (scan->current_block == 0) { 414 if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) { 415 goto force_new_group; 416 } else 417 return EXT2_ET_MISSING_INODE_TABLE; 418 } 419 420 421 /* 422 * Have we run out of space in the inode buffer? If so, we 423 * need to read in more blocks. 424 */ 425 if (scan->bytes_left < scan->inode_size) { 426 memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left); 427 extra_bytes = scan->bytes_left; 428 429 retval = get_next_blocks(scan); 430 if (retval) 431 return retval; 432#if 0 433 /* 434 * XXX test Need check for used inode somehow. 435 * (Note: this is hard.) 436 */ 437 if (is_empty_scan(scan)) 438 goto force_new_group; 439#endif 440 } 441 442 retval = 0; 443 if (extra_bytes) { 444 memcpy(scan->temp_buffer+extra_bytes, scan->ptr, 445 scan->inode_size - extra_bytes); 446 scan->ptr += scan->inode_size - extra_bytes; 447 scan->bytes_left -= scan->inode_size - extra_bytes; 448 449#ifdef EXT2FS_ENABLE_SWAPFS 450 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || 451 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 452 ext2fs_swap_inode_full(scan->fs, 453 (struct ext2_inode_large *) inode, 454 (struct ext2_inode_large *) scan->temp_buffer, 455 0, bufsize); 456 else 457#endif 458 *inode = *((struct ext2_inode *) scan->temp_buffer); 459 if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) 460 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; 461 scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; 462 } else { 463#ifdef EXT2FS_ENABLE_SWAPFS 464 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || 465 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 466 ext2fs_swap_inode_full(scan->fs, 467 (struct ext2_inode_large *) inode, 468 (struct ext2_inode_large *) scan->ptr, 469 0, bufsize); 470 else 471#endif 472 memcpy(inode, scan->ptr, bufsize); 473 scan->ptr += scan->inode_size; 474 scan->bytes_left -= scan->inode_size; 475 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) 476 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; 477 } 478 479 scan->inodes_left--; 480 scan->current_inode++; 481 *ino = scan->current_inode; 482 return retval; 483} 484 485errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino, 486 struct ext2_inode *inode) 487{ 488 return ext2fs_get_next_inode_full(scan, ino, inode, 489 sizeof(struct ext2_inode)); 490} 491 492/* 493 * Functions to read and write a single inode. 494 */ 495errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, 496 struct ext2_inode * inode, int bufsize) 497{ 498 unsigned long group, block, block_nr, offset; 499 char *ptr; 500 errcode_t retval; 501 int clen, i, inodes_per_block, length; 502 io_channel io; 503 504 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 505 506 /* Check to see if user has an override function */ 507 if (fs->read_inode) { 508 retval = (fs->read_inode)(fs, ino, inode); 509 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 510 return retval; 511 } 512 /* Create inode cache if not present */ 513 if (!fs->icache) { 514 retval = create_icache(fs); 515 if (retval) 516 return retval; 517 } 518 /* Check to see if it's in the inode cache */ 519 if (bufsize == sizeof(struct ext2_inode)) { 520 /* only old good inode can be retrieve from the cache */ 521 for (i=0; i < fs->icache->cache_size; i++) { 522 if (fs->icache->cache[i].ino == ino) { 523 *inode = fs->icache->cache[i].inode; 524 return 0; 525 } 526 } 527 } 528 if ((ino == 0) || (ino > fs->super->s_inodes_count)) 529 return EXT2_ET_BAD_INODE_NUM; 530 if (fs->flags & EXT2_FLAG_IMAGE_FILE) { 531 inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super); 532 block_nr = fs->image_header->offset_inode / fs->blocksize; 533 block_nr += (ino - 1) / inodes_per_block; 534 offset = ((ino - 1) % inodes_per_block) * 535 EXT2_INODE_SIZE(fs->super); 536 io = fs->image_io; 537 } else { 538 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); 539 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * 540 EXT2_INODE_SIZE(fs->super); 541 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); 542 if (!fs->group_desc[(unsigned)group].bg_inode_table) 543 return EXT2_ET_MISSING_INODE_TABLE; 544 block_nr = fs->group_desc[(unsigned)group].bg_inode_table + 545 block; 546 io = fs->io; 547 } 548 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); 549 550 length = EXT2_INODE_SIZE(fs->super); 551 if (bufsize < length) 552 length = bufsize; 553 554 ptr = (char *) inode; 555 while (length) { 556 clen = length; 557 if ((offset + length) > fs->blocksize) 558 clen = fs->blocksize - offset; 559 560 if (block_nr != fs->icache->buffer_blk) { 561 retval = io_channel_read_blk(io, block_nr, 1, 562 fs->icache->buffer); 563 if (retval) 564 return retval; 565 fs->icache->buffer_blk = block_nr; 566 } 567 568 memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset, 569 clen); 570 571 offset = 0; 572 length -= clen; 573 ptr += clen; 574 block_nr++; 575 } 576 577#ifdef EXT2FS_ENABLE_SWAPFS 578 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || 579 (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 580 ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, 581 (struct ext2_inode_large *) inode, 582 0, length); 583#endif 584 585 /* Update the inode cache */ 586 fs->icache->cache_last = (fs->icache->cache_last + 1) % 587 fs->icache->cache_size; 588 fs->icache->cache[fs->icache->cache_last].ino = ino; 589 fs->icache->cache[fs->icache->cache_last].inode = *inode; 590 591 return 0; 592} 593 594errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino, 595 struct ext2_inode * inode) 596{ 597 return ext2fs_read_inode_full(fs, ino, inode, 598 sizeof(struct ext2_inode)); 599} 600 601errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, 602 struct ext2_inode * inode, int bufsize) 603{ 604 unsigned long group, block, block_nr, offset; 605 errcode_t retval = 0; 606 struct ext2_inode_large temp_inode, *w_inode; 607 char *ptr; 608 int clen, i, length; 609 610 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 611 612 /* Check to see if user provided an override function */ 613 if (fs->write_inode) { 614 retval = (fs->write_inode)(fs, ino, inode); 615 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 616 return retval; 617 } 618 619 /* Check to see if the inode cache needs to be updated */ 620 if (fs->icache) { 621 for (i=0; i < fs->icache->cache_size; i++) { 622 if (fs->icache->cache[i].ino == ino) { 623 fs->icache->cache[i].inode = *inode; 624 break; 625 } 626 } 627 } else { 628 retval = create_icache(fs); 629 if (retval) 630 return retval; 631 } 632 633 if (!(fs->flags & EXT2_FLAG_RW)) 634 return EXT2_ET_RO_FILSYS; 635 636 if ((ino == 0) || (ino > fs->super->s_inodes_count)) 637 return EXT2_ET_BAD_INODE_NUM; 638 639 length = bufsize; 640 if (length < EXT2_INODE_SIZE(fs->super)) 641 length = EXT2_INODE_SIZE(fs->super); 642 643 if (length > (int) sizeof(struct ext2_inode_large)) { 644 w_inode = malloc(length); 645 if (!w_inode) 646 return ENOMEM; 647 } else 648 w_inode = &temp_inode; 649 memset(w_inode, 0, length); 650 651#ifdef EXT2FS_ENABLE_SWAPFS 652 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || 653 (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) 654 ext2fs_swap_inode_full(fs, w_inode, 655 (struct ext2_inode_large *) inode, 656 1, bufsize); 657 else 658#endif 659 memcpy(w_inode, inode, bufsize); 660 661 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); 662 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * 663 EXT2_INODE_SIZE(fs->super); 664 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); 665 if (!fs->group_desc[(unsigned) group].bg_inode_table) 666 return EXT2_ET_MISSING_INODE_TABLE; 667 block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block; 668 669 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); 670 671 length = EXT2_INODE_SIZE(fs->super); 672 if (length > bufsize) 673 length = bufsize; 674 675 ptr = (char *) w_inode; 676 677 while (length) { 678 clen = length; 679 if ((offset + length) > fs->blocksize) 680 clen = fs->blocksize - offset; 681 682 if (fs->icache->buffer_blk != block_nr) { 683 retval = io_channel_read_blk(fs->io, block_nr, 1, 684 fs->icache->buffer); 685 if (retval) 686 goto errout; 687 fs->icache->buffer_blk = block_nr; 688 } 689 690 691 memcpy((char *) fs->icache->buffer + (unsigned) offset, 692 ptr, clen); 693 694 retval = io_channel_write_blk(fs->io, block_nr, 1, 695 fs->icache->buffer); 696 if (retval) 697 goto errout; 698 699 offset = 0; 700 ptr += clen; 701 length -= clen; 702 block_nr++; 703 } 704 705 fs->flags |= EXT2_FLAG_CHANGED; 706errout: 707 if (w_inode && w_inode != &temp_inode) 708 free(w_inode); 709 return retval; 710} 711 712errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino, 713 struct ext2_inode *inode) 714{ 715 return ext2fs_write_inode_full(fs, ino, inode, 716 sizeof(struct ext2_inode)); 717} 718 719/* 720 * This function should be called when writing a new inode. It makes 721 * sure that extra part of large inodes is cleared. 722 */ 723errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino, 724 struct ext2_inode *inode) 725{ 726 struct ext2_inode *buf; 727 errcode_t retval; 728 int size = EXT2_INODE_SIZE(fs->super); 729 730 if (size == sizeof(struct ext2_inode)) 731 return ext2fs_write_inode_full(fs, ino, inode, 732 sizeof(struct ext2_inode)); 733 734 buf = malloc(size); 735 if (!buf) 736 return ENOMEM; 737 738 memset(buf, 0, size); 739 *buf = *inode; 740 741 retval = ext2fs_write_inode_full(fs, ino, buf, size); 742} 743 744 745errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks) 746{ 747 struct ext2_inode inode; 748 int i; 749 errcode_t retval; 750 751 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 752 753 if (ino > fs->super->s_inodes_count) 754 return EXT2_ET_BAD_INODE_NUM; 755 756 if (fs->get_blocks) { 757 if (!(*fs->get_blocks)(fs, ino, blocks)) 758 return 0; 759 } 760 retval = ext2fs_read_inode(fs, ino, &inode); 761 if (retval) 762 return retval; 763 for (i=0; i < EXT2_N_BLOCKS; i++) 764 blocks[i] = inode.i_block[i]; 765 return 0; 766} 767 768errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino) 769{ 770 struct ext2_inode inode; 771 errcode_t retval; 772 773 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 774 775 if (ino > fs->super->s_inodes_count) 776 return EXT2_ET_BAD_INODE_NUM; 777 778 if (fs->check_directory) { 779 retval = (fs->check_directory)(fs, ino); 780 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 781 return retval; 782 } 783 retval = ext2fs_read_inode(fs, ino, &inode); 784 if (retval) 785 return retval; 786 if (!LINUX_S_ISDIR(inode.i_mode)) 787 return EXT2_ET_NO_DIRECTORY; 788 return 0; 789} 790 791