1 /* 2 * (C) Copyright 2011 - 2012 Samsung Electronics 3 * EXT4 filesystem implementation in Uboot by 4 * Uma Shankar <uma.shankar@samsung.com> 5 * Manjunatha C Achar <a.manjunatha@samsung.com> 6 * 7 * ext4ls and ext4load : Based on ext2 ls load support in Uboot. 8 * 9 * (C) Copyright 2004 10 * esd gmbh <www.esd-electronics.com> 11 * Reinhard Arlt <reinhard.arlt@esd-electronics.com> 12 * 13 * based on code from grub2 fs/ext2.c and fs/fshelp.c by 14 * GRUB -- GRand Unified Bootloader 15 * Copyright (C) 2003, 2004 Free Software Foundation, Inc. 16 * 17 * ext4write : Based on generic ext4 protocol. 18 * 19 * SPDX-License-Identifier: GPL-2.0+ 20 */ 21 22 #include <common.h> 23 #include <ext_common.h> 24 #include <ext4fs.h> 25 #include <malloc.h> 26 #include <stddef.h> 27 #include <linux/stat.h> 28 #include <linux/time.h> 29 #include <linux/list.h> 30 #include <asm/byteorder.h> 31 #include "ext4_common.h" 32 33 struct ext2_data *ext4fs_root; 34 struct ext2fs_node *ext4fs_file; 35 uint32_t *ext4fs_indir1_block; 36 int ext4fs_indir1_size; 37 int ext4fs_indir1_blkno = -1; 38 uint32_t *ext4fs_indir2_block; 39 int ext4fs_indir2_size; 40 int ext4fs_indir2_blkno = -1; 41 42 uint32_t *ext4fs_indir3_block; 43 int ext4fs_indir3_size; 44 int ext4fs_indir3_blkno = -1; 45 struct ext2_inode *g_parent_inode; 46 static int symlinknest; 47 48 struct ext4_extent_node { 49 uint32_t block; 50 uint16_t len; 51 uint64_t start; 52 struct list_head lh; 53 }; 54 static LIST_HEAD(ext4_extent_lh); 55 56 #if defined(CONFIG_EXT4_WRITE) 57 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) 58 { 59 uint32_t res = size / n; 60 if (res * n != size) 61 res++; 62 63 return res; 64 } 65 66 void put_ext4(uint64_t off, void *buf, uint32_t size) 67 { 68 uint64_t startblock; 69 uint64_t remainder; 70 unsigned char *temp_ptr = NULL; 71 struct ext_filesystem *fs = get_fs(); 72 int log2blksz = fs->dev_desc->log2blksz; 73 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); 74 75 startblock = off >> log2blksz; 76 startblock += part_offset; 77 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); 78 79 if (fs->dev_desc == NULL) 80 return; 81 82 if ((startblock + (size >> log2blksz)) > 83 (part_offset + fs->total_sect)) { 84 printf("part_offset is " LBAFU "\n", part_offset); 85 printf("total_sector is %llu\n", fs->total_sect); 86 printf("error: overflow occurs\n"); 87 return; 88 } 89 90 if (remainder) { 91 if (fs->dev_desc->block_read) { 92 fs->dev_desc->block_read(fs->dev_desc->dev, 93 startblock, 1, sec_buf); 94 temp_ptr = sec_buf; 95 memcpy((temp_ptr + remainder), 96 (unsigned char *)buf, size); 97 fs->dev_desc->block_write(fs->dev_desc->dev, 98 startblock, 1, sec_buf); 99 } 100 } else { 101 if (size >> log2blksz != 0) { 102 fs->dev_desc->block_write(fs->dev_desc->dev, 103 startblock, 104 size >> log2blksz, 105 (unsigned long *)buf); 106 } else { 107 fs->dev_desc->block_read(fs->dev_desc->dev, 108 startblock, 1, sec_buf); 109 temp_ptr = sec_buf; 110 memcpy(temp_ptr, buf, size); 111 fs->dev_desc->block_write(fs->dev_desc->dev, 112 startblock, 1, 113 (unsigned long *)sec_buf); 114 } 115 } 116 } 117 118 static int _get_new_inode_no(unsigned char *buffer) 119 { 120 struct ext_filesystem *fs = get_fs(); 121 unsigned char input; 122 int operand, status; 123 int count = 1; 124 int j = 0; 125 126 /* get the blocksize of the filesystem */ 127 unsigned char *ptr = buffer; 128 while (*ptr == 255) { 129 ptr++; 130 count += 8; 131 if (count > ext4fs_root->sblock.inodes_per_group) 132 return -1; 133 } 134 135 for (j = 0; j < fs->blksz; j++) { 136 input = *ptr; 137 int i = 0; 138 while (i <= 7) { 139 operand = 1 << i; 140 status = input & operand; 141 if (status) { 142 i++; 143 count++; 144 } else { 145 *ptr |= operand; 146 return count; 147 } 148 } 149 ptr = ptr + 1; 150 } 151 152 return -1; 153 } 154 155 static int _get_new_blk_no(unsigned char *buffer) 156 { 157 unsigned char input; 158 int operand, status; 159 int count = 0; 160 int j = 0; 161 unsigned char *ptr = buffer; 162 struct ext_filesystem *fs = get_fs(); 163 164 if (fs->blksz != 1024) 165 count = 0; 166 else 167 count = 1; 168 169 while (*ptr == 255) { 170 ptr++; 171 count += 8; 172 if (count == (fs->blksz * 8)) 173 return -1; 174 } 175 176 for (j = 0; j < fs->blksz; j++) { 177 input = *ptr; 178 int i = 0; 179 while (i <= 7) { 180 operand = 1 << i; 181 status = input & operand; 182 if (status) { 183 i++; 184 count++; 185 } else { 186 *ptr |= operand; 187 return count; 188 } 189 } 190 ptr = ptr + 1; 191 } 192 193 return -1; 194 } 195 196 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) 197 { 198 int i, remainder, status; 199 unsigned char *ptr = buffer; 200 unsigned char operand; 201 i = blockno / 8; 202 remainder = blockno % 8; 203 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 204 205 i = i - (index * blocksize); 206 if (blocksize != 1024) { 207 ptr = ptr + i; 208 operand = 1 << remainder; 209 status = *ptr & operand; 210 if (status) 211 return -1; 212 213 *ptr = *ptr | operand; 214 return 0; 215 } else { 216 if (remainder == 0) { 217 ptr = ptr + i - 1; 218 operand = (1 << 7); 219 } else { 220 ptr = ptr + i; 221 operand = (1 << (remainder - 1)); 222 } 223 status = *ptr & operand; 224 if (status) 225 return -1; 226 227 *ptr = *ptr | operand; 228 return 0; 229 } 230 } 231 232 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) 233 { 234 int i, remainder, status; 235 unsigned char *ptr = buffer; 236 unsigned char operand; 237 i = blockno / 8; 238 remainder = blockno % 8; 239 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 240 241 i = i - (index * blocksize); 242 if (blocksize != 1024) { 243 ptr = ptr + i; 244 operand = (1 << remainder); 245 status = *ptr & operand; 246 if (status) 247 *ptr = *ptr & ~(operand); 248 } else { 249 if (remainder == 0) { 250 ptr = ptr + i - 1; 251 operand = (1 << 7); 252 } else { 253 ptr = ptr + i; 254 operand = (1 << (remainder - 1)); 255 } 256 status = *ptr & operand; 257 if (status) 258 *ptr = *ptr & ~(operand); 259 } 260 } 261 262 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) 263 { 264 int i, remainder, status; 265 unsigned char *ptr = buffer; 266 unsigned char operand; 267 268 inode_no -= (index * ext4fs_root->sblock.inodes_per_group); 269 i = inode_no / 8; 270 remainder = inode_no % 8; 271 if (remainder == 0) { 272 ptr = ptr + i - 1; 273 operand = (1 << 7); 274 } else { 275 ptr = ptr + i; 276 operand = (1 << (remainder - 1)); 277 } 278 status = *ptr & operand; 279 if (status) 280 return -1; 281 282 *ptr = *ptr | operand; 283 284 return 0; 285 } 286 287 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) 288 { 289 int i, remainder, status; 290 unsigned char *ptr = buffer; 291 unsigned char operand; 292 293 inode_no -= (index * ext4fs_root->sblock.inodes_per_group); 294 i = inode_no / 8; 295 remainder = inode_no % 8; 296 if (remainder == 0) { 297 ptr = ptr + i - 1; 298 operand = (1 << 7); 299 } else { 300 ptr = ptr + i; 301 operand = (1 << (remainder - 1)); 302 } 303 status = *ptr & operand; 304 if (status) 305 *ptr = *ptr & ~(operand); 306 } 307 308 int ext4fs_checksum_update(unsigned int i) 309 { 310 struct ext2_block_group *desc; 311 struct ext_filesystem *fs = get_fs(); 312 __u16 crc = 0; 313 314 desc = (struct ext2_block_group *)&fs->bgd[i]; 315 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { 316 int offset = offsetof(struct ext2_block_group, bg_checksum); 317 318 crc = ext2fs_crc16(~0, fs->sb->unique_id, 319 sizeof(fs->sb->unique_id)); 320 crc = ext2fs_crc16(crc, &i, sizeof(i)); 321 crc = ext2fs_crc16(crc, desc, offset); 322 offset += sizeof(desc->bg_checksum); /* skip checksum */ 323 assert(offset == sizeof(*desc)); 324 } 325 326 return crc; 327 } 328 329 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) 330 { 331 int dentry_length; 332 int sizeof_void_space; 333 int new_entry_byte_reqd; 334 short padding_factor = 0; 335 336 if (dir->namelen % 4 != 0) 337 padding_factor = 4 - (dir->namelen % 4); 338 339 dentry_length = sizeof(struct ext2_dirent) + 340 dir->namelen + padding_factor; 341 sizeof_void_space = dir->direntlen - dentry_length; 342 if (sizeof_void_space == 0) 343 return 0; 344 345 padding_factor = 0; 346 if (strlen(filename) % 4 != 0) 347 padding_factor = 4 - (strlen(filename) % 4); 348 349 new_entry_byte_reqd = strlen(filename) + 350 sizeof(struct ext2_dirent) + padding_factor; 351 if (sizeof_void_space >= new_entry_byte_reqd) { 352 dir->direntlen = dentry_length; 353 return sizeof_void_space; 354 } 355 356 return 0; 357 } 358 359 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type) 360 { 361 unsigned int *zero_buffer = NULL; 362 char *root_first_block_buffer = NULL; 363 int direct_blk_idx; 364 long int root_blknr; 365 long int first_block_no_of_root = 0; 366 long int previous_blknr = -1; 367 int totalbytes = 0; 368 short int padding_factor = 0; 369 unsigned int new_entry_byte_reqd; 370 unsigned int last_entry_dirlen; 371 int sizeof_void_space = 0; 372 int templength = 0; 373 int inodeno; 374 int status; 375 struct ext_filesystem *fs = get_fs(); 376 /* directory entry */ 377 struct ext2_dirent *dir; 378 char *temp_dir = NULL; 379 380 zero_buffer = zalloc(fs->blksz); 381 if (!zero_buffer) { 382 printf("No Memory\n"); 383 return; 384 } 385 root_first_block_buffer = zalloc(fs->blksz); 386 if (!root_first_block_buffer) { 387 free(zero_buffer); 388 printf("No Memory\n"); 389 return; 390 } 391 restart: 392 393 /* read the block no allocated to a file */ 394 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 395 direct_blk_idx++) { 396 root_blknr = read_allocated_block(g_parent_inode, 397 direct_blk_idx); 398 if (root_blknr == 0) { 399 first_block_no_of_root = previous_blknr; 400 break; 401 } 402 previous_blknr = root_blknr; 403 } 404 405 status = ext4fs_devread((lbaint_t)first_block_no_of_root 406 * fs->sect_perblk, 407 0, fs->blksz, root_first_block_buffer); 408 if (status == 0) 409 goto fail; 410 411 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 412 goto fail; 413 dir = (struct ext2_dirent *)root_first_block_buffer; 414 totalbytes = 0; 415 while (dir->direntlen > 0) { 416 /* 417 * blocksize-totalbytes because last directory length 418 * i.e. dir->direntlen is free availble space in the 419 * block that means it is a last entry of directory 420 * entry 421 */ 422 423 /* traversing the each directory entry */ 424 if (fs->blksz - totalbytes == dir->direntlen) { 425 if (strlen(filename) % 4 != 0) 426 padding_factor = 4 - (strlen(filename) % 4); 427 428 new_entry_byte_reqd = strlen(filename) + 429 sizeof(struct ext2_dirent) + padding_factor; 430 padding_factor = 0; 431 /* 432 * update last directory entry length to its 433 * length because we are creating new directory 434 * entry 435 */ 436 if (dir->namelen % 4 != 0) 437 padding_factor = 4 - (dir->namelen % 4); 438 439 last_entry_dirlen = dir->namelen + 440 sizeof(struct ext2_dirent) + padding_factor; 441 if ((fs->blksz - totalbytes - last_entry_dirlen) < 442 new_entry_byte_reqd) { 443 printf("1st Block Full:Allocate new block\n"); 444 445 if (direct_blk_idx == INDIRECT_BLOCKS - 1) { 446 printf("Directory exceeds limit\n"); 447 goto fail; 448 } 449 g_parent_inode->b.blocks.dir_blocks 450 [direct_blk_idx] = ext4fs_get_new_blk_no(); 451 if (g_parent_inode->b.blocks.dir_blocks 452 [direct_blk_idx] == -1) { 453 printf("no block left to assign\n"); 454 goto fail; 455 } 456 put_ext4(((uint64_t) 457 ((uint64_t)g_parent_inode->b. 458 blocks.dir_blocks[direct_blk_idx] * 459 (uint64_t)fs->blksz)), zero_buffer, fs->blksz); 460 g_parent_inode->size = 461 g_parent_inode->size + fs->blksz; 462 g_parent_inode->blockcnt = 463 g_parent_inode->blockcnt + fs->sect_perblk; 464 if (ext4fs_put_metadata 465 (root_first_block_buffer, 466 first_block_no_of_root)) 467 goto fail; 468 goto restart; 469 } 470 dir->direntlen = last_entry_dirlen; 471 break; 472 } 473 474 templength = dir->direntlen; 475 totalbytes = totalbytes + templength; 476 sizeof_void_space = check_void_in_dentry(dir, filename); 477 if (sizeof_void_space) 478 break; 479 480 dir = (struct ext2_dirent *)((char *)dir + templength); 481 } 482 483 /* make a pointer ready for creating next directory entry */ 484 templength = dir->direntlen; 485 totalbytes = totalbytes + templength; 486 dir = (struct ext2_dirent *)((char *)dir + templength); 487 488 /* get the next available inode number */ 489 inodeno = ext4fs_get_new_inode_no(); 490 if (inodeno == -1) { 491 printf("no inode left to assign\n"); 492 goto fail; 493 } 494 dir->inode = inodeno; 495 if (sizeof_void_space) 496 dir->direntlen = sizeof_void_space; 497 else 498 dir->direntlen = fs->blksz - totalbytes; 499 500 dir->namelen = strlen(filename); 501 dir->filetype = FILETYPE_REG; /* regular file */ 502 temp_dir = (char *)dir; 503 temp_dir = temp_dir + sizeof(struct ext2_dirent); 504 memcpy(temp_dir, filename, strlen(filename)); 505 506 *p_ino = inodeno; 507 508 /* update or write the 1st block of root inode */ 509 if (ext4fs_put_metadata(root_first_block_buffer, 510 first_block_no_of_root)) 511 goto fail; 512 513 fail: 514 free(zero_buffer); 515 free(root_first_block_buffer); 516 } 517 518 static int search_dir(struct ext2_inode *parent_inode, char *dirname) 519 { 520 int status; 521 int inodeno; 522 int totalbytes; 523 int templength; 524 int direct_blk_idx; 525 long int blknr; 526 int found = 0; 527 char *ptr = NULL; 528 unsigned char *block_buffer = NULL; 529 struct ext2_dirent *dir = NULL; 530 struct ext2_dirent *previous_dir = NULL; 531 struct ext_filesystem *fs = get_fs(); 532 533 /* read the block no allocated to a file */ 534 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 535 direct_blk_idx++) { 536 blknr = read_allocated_block(parent_inode, direct_blk_idx); 537 if (blknr == 0) 538 goto fail; 539 540 /* read the blocks of parenet inode */ 541 block_buffer = zalloc(fs->blksz); 542 if (!block_buffer) 543 goto fail; 544 545 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 546 0, fs->blksz, (char *)block_buffer); 547 if (status == 0) 548 goto fail; 549 550 dir = (struct ext2_dirent *)block_buffer; 551 ptr = (char *)dir; 552 totalbytes = 0; 553 while (dir->direntlen >= 0) { 554 /* 555 * blocksize-totalbytes because last directory 556 * length i.e.,*dir->direntlen is free availble 557 * space in the block that means 558 * it is a last entry of directory entry 559 */ 560 if (strlen(dirname) == dir->namelen) { 561 if (strncmp(dirname, ptr + 562 sizeof(struct ext2_dirent), 563 dir->namelen) == 0) { 564 previous_dir->direntlen += 565 dir->direntlen; 566 inodeno = dir->inode; 567 dir->inode = 0; 568 found = 1; 569 break; 570 } 571 } 572 573 if (fs->blksz - totalbytes == dir->direntlen) 574 break; 575 576 /* traversing the each directory entry */ 577 templength = dir->direntlen; 578 totalbytes = totalbytes + templength; 579 previous_dir = dir; 580 dir = (struct ext2_dirent *)((char *)dir + templength); 581 ptr = (char *)dir; 582 } 583 584 if (found == 1) { 585 free(block_buffer); 586 block_buffer = NULL; 587 return inodeno; 588 } 589 590 free(block_buffer); 591 block_buffer = NULL; 592 } 593 594 fail: 595 free(block_buffer); 596 597 return -1; 598 } 599 600 static int find_dir_depth(char *dirname) 601 { 602 char *token = strtok(dirname, "/"); 603 int count = 0; 604 while (token != NULL) { 605 token = strtok(NULL, "/"); 606 count++; 607 } 608 return count + 1 + 1; 609 /* 610 * for example for string /home/temp 611 * depth=home(1)+temp(1)+1 extra for NULL; 612 * so count is 4; 613 */ 614 } 615 616 static int parse_path(char **arr, char *dirname) 617 { 618 char *token = strtok(dirname, "/"); 619 int i = 0; 620 621 /* add root */ 622 arr[i] = zalloc(strlen("/") + 1); 623 if (!arr[i]) 624 return -ENOMEM; 625 626 arr[i++] = "/"; 627 628 /* add each path entry after root */ 629 while (token != NULL) { 630 arr[i] = zalloc(strlen(token) + 1); 631 if (!arr[i]) 632 return -ENOMEM; 633 memcpy(arr[i++], token, strlen(token)); 634 token = strtok(NULL, "/"); 635 } 636 arr[i] = NULL; 637 638 return 0; 639 } 640 641 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 642 { 643 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 644 return -1; 645 646 return 0; 647 } 648 649 /* 650 * Function: ext4fs_get_parent_inode_num 651 * Return Value: inode Number of the parent directory of file/Directory to be 652 * created 653 * dirname : Input parmater, input path name of the file/directory to be created 654 * dname : Output parameter, to be filled with the name of the directory 655 * extracted from dirname 656 */ 657 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 658 { 659 int i; 660 int depth = 0; 661 int matched_inode_no; 662 int result_inode_no = -1; 663 char **ptr = NULL; 664 char *depth_dirname = NULL; 665 char *parse_dirname = NULL; 666 struct ext2_inode *parent_inode = NULL; 667 struct ext2_inode *first_inode = NULL; 668 struct ext2_inode temp_inode; 669 670 if (*dirname != '/') { 671 printf("Please supply Absolute path\n"); 672 return -1; 673 } 674 675 /* TODO: input validation make equivalent to linux */ 676 depth_dirname = zalloc(strlen(dirname) + 1); 677 if (!depth_dirname) 678 return -ENOMEM; 679 680 memcpy(depth_dirname, dirname, strlen(dirname)); 681 depth = find_dir_depth(depth_dirname); 682 parse_dirname = zalloc(strlen(dirname) + 1); 683 if (!parse_dirname) 684 goto fail; 685 memcpy(parse_dirname, dirname, strlen(dirname)); 686 687 /* allocate memory for each directory level */ 688 ptr = zalloc((depth) * sizeof(char *)); 689 if (!ptr) 690 goto fail; 691 if (parse_path(ptr, parse_dirname)) 692 goto fail; 693 parent_inode = zalloc(sizeof(struct ext2_inode)); 694 if (!parent_inode) 695 goto fail; 696 first_inode = zalloc(sizeof(struct ext2_inode)); 697 if (!first_inode) 698 goto fail; 699 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 700 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 701 if (flags & F_FILE) 702 result_inode_no = EXT2_ROOT_INO; 703 for (i = 1; i < depth; i++) { 704 matched_inode_no = search_dir(parent_inode, ptr[i]); 705 if (matched_inode_no == -1) { 706 if (ptr[i + 1] == NULL && i == 1) { 707 result_inode_no = EXT2_ROOT_INO; 708 goto end; 709 } else { 710 if (ptr[i + 1] == NULL) 711 break; 712 printf("Invalid path\n"); 713 result_inode_no = -1; 714 goto fail; 715 } 716 } else { 717 if (ptr[i + 1] != NULL) { 718 memset(parent_inode, '\0', 719 sizeof(struct ext2_inode)); 720 if (ext4fs_iget(matched_inode_no, 721 parent_inode)) { 722 result_inode_no = -1; 723 goto fail; 724 } 725 result_inode_no = matched_inode_no; 726 } else { 727 break; 728 } 729 } 730 } 731 732 end: 733 if (i == 1) 734 matched_inode_no = search_dir(first_inode, ptr[i]); 735 else 736 matched_inode_no = search_dir(parent_inode, ptr[i]); 737 738 if (matched_inode_no != -1) { 739 ext4fs_iget(matched_inode_no, &temp_inode); 740 if (temp_inode.mode & S_IFDIR) { 741 printf("It is a Directory\n"); 742 result_inode_no = -1; 743 goto fail; 744 } 745 } 746 747 if (strlen(ptr[i]) > 256) { 748 result_inode_no = -1; 749 goto fail; 750 } 751 memcpy(dname, ptr[i], strlen(ptr[i])); 752 753 fail: 754 free(depth_dirname); 755 free(parse_dirname); 756 free(ptr); 757 free(parent_inode); 758 free(first_inode); 759 760 return result_inode_no; 761 } 762 763 static int check_filename(char *filename, unsigned int blknr) 764 { 765 unsigned int first_block_no_of_root; 766 int totalbytes = 0; 767 int templength = 0; 768 int status, inodeno; 769 int found = 0; 770 char *root_first_block_buffer = NULL; 771 char *root_first_block_addr = NULL; 772 struct ext2_dirent *dir = NULL; 773 struct ext2_dirent *previous_dir = NULL; 774 char *ptr = NULL; 775 struct ext_filesystem *fs = get_fs(); 776 777 /* get the first block of root */ 778 first_block_no_of_root = blknr; 779 root_first_block_buffer = zalloc(fs->blksz); 780 if (!root_first_block_buffer) 781 return -ENOMEM; 782 root_first_block_addr = root_first_block_buffer; 783 status = ext4fs_devread((lbaint_t)first_block_no_of_root * 784 fs->sect_perblk, 0, 785 fs->blksz, root_first_block_buffer); 786 if (status == 0) 787 goto fail; 788 789 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 790 goto fail; 791 dir = (struct ext2_dirent *)root_first_block_buffer; 792 ptr = (char *)dir; 793 totalbytes = 0; 794 while (dir->direntlen >= 0) { 795 /* 796 * blocksize-totalbytes because last 797 * directory length i.e., *dir->direntlen 798 * is free availble space in the block that 799 * means it is a last entry of directory entry 800 */ 801 if (strlen(filename) == dir->namelen) { 802 if (strncmp(filename, ptr + sizeof(struct ext2_dirent), 803 dir->namelen) == 0) { 804 printf("file found deleting\n"); 805 previous_dir->direntlen += dir->direntlen; 806 inodeno = dir->inode; 807 dir->inode = 0; 808 found = 1; 809 break; 810 } 811 } 812 813 if (fs->blksz - totalbytes == dir->direntlen) 814 break; 815 816 /* traversing the each directory entry */ 817 templength = dir->direntlen; 818 totalbytes = totalbytes + templength; 819 previous_dir = dir; 820 dir = (struct ext2_dirent *)((char *)dir + templength); 821 ptr = (char *)dir; 822 } 823 824 825 if (found == 1) { 826 if (ext4fs_put_metadata(root_first_block_addr, 827 first_block_no_of_root)) 828 goto fail; 829 return inodeno; 830 } 831 fail: 832 free(root_first_block_buffer); 833 834 return -1; 835 } 836 837 int ext4fs_filename_check(char *filename) 838 { 839 short direct_blk_idx = 0; 840 long int blknr = -1; 841 int inodeno = -1; 842 843 /* read the block no allocated to a file */ 844 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 845 direct_blk_idx++) { 846 blknr = read_allocated_block(g_parent_inode, direct_blk_idx); 847 if (blknr == 0) 848 break; 849 inodeno = check_filename(filename, blknr); 850 if (inodeno != -1) 851 return inodeno; 852 } 853 854 return -1; 855 } 856 857 long int ext4fs_get_new_blk_no(void) 858 { 859 short i; 860 short status; 861 int remainder; 862 unsigned int bg_idx; 863 static int prev_bg_bitmap_index = -1; 864 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group; 865 struct ext_filesystem *fs = get_fs(); 866 char *journal_buffer = zalloc(fs->blksz); 867 char *zero_buffer = zalloc(fs->blksz); 868 if (!journal_buffer || !zero_buffer) 869 goto fail; 870 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; 871 872 if (fs->first_pass_bbmap == 0) { 873 for (i = 0; i < fs->no_blkgrp; i++) { 874 if (bgd[i].free_blocks) { 875 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) { 876 put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id * 877 (uint64_t)fs->blksz)), 878 zero_buffer, fs->blksz); 879 bgd[i].bg_flags = 880 bgd[i]. 881 bg_flags & ~EXT4_BG_BLOCK_UNINIT; 882 memcpy(fs->blk_bmaps[i], zero_buffer, 883 fs->blksz); 884 } 885 fs->curr_blkno = 886 _get_new_blk_no(fs->blk_bmaps[i]); 887 if (fs->curr_blkno == -1) 888 /* if block bitmap is completely fill */ 889 continue; 890 fs->curr_blkno = fs->curr_blkno + 891 (i * fs->blksz * 8); 892 fs->first_pass_bbmap++; 893 bgd[i].free_blocks--; 894 fs->sb->free_blocks--; 895 status = ext4fs_devread((lbaint_t) 896 bgd[i].block_id * 897 fs->sect_perblk, 0, 898 fs->blksz, 899 journal_buffer); 900 if (status == 0) 901 goto fail; 902 if (ext4fs_log_journal(journal_buffer, 903 bgd[i].block_id)) 904 goto fail; 905 goto success; 906 } else { 907 debug("no space left on block group %d\n", i); 908 } 909 } 910 911 goto fail; 912 } else { 913 restart: 914 fs->curr_blkno++; 915 /* get the blockbitmap index respective to blockno */ 916 if (fs->blksz != 1024) { 917 bg_idx = fs->curr_blkno / blk_per_grp; 918 } else { 919 bg_idx = fs->curr_blkno / blk_per_grp; 920 remainder = fs->curr_blkno % blk_per_grp; 921 if (!remainder) 922 bg_idx--; 923 } 924 925 /* 926 * To skip completely filled block group bitmaps 927 * Optimize the block allocation 928 */ 929 if (bg_idx >= fs->no_blkgrp) 930 goto fail; 931 932 if (bgd[bg_idx].free_blocks == 0) { 933 debug("block group %u is full. Skipping\n", bg_idx); 934 fs->curr_blkno = fs->curr_blkno + blk_per_grp; 935 fs->curr_blkno--; 936 goto restart; 937 } 938 939 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) { 940 memset(zero_buffer, '\0', fs->blksz); 941 put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id * 942 (uint64_t)fs->blksz)), zero_buffer, fs->blksz); 943 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 944 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags & 945 ~EXT4_BG_BLOCK_UNINIT; 946 } 947 948 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 949 bg_idx) != 0) { 950 debug("going for restart for the block no %ld %u\n", 951 fs->curr_blkno, bg_idx); 952 goto restart; 953 } 954 955 /* journal backup */ 956 if (prev_bg_bitmap_index != bg_idx) { 957 memset(journal_buffer, '\0', fs->blksz); 958 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id 959 * fs->sect_perblk, 960 0, fs->blksz, journal_buffer); 961 if (status == 0) 962 goto fail; 963 if (ext4fs_log_journal(journal_buffer, 964 bgd[bg_idx].block_id)) 965 goto fail; 966 967 prev_bg_bitmap_index = bg_idx; 968 } 969 bgd[bg_idx].free_blocks--; 970 fs->sb->free_blocks--; 971 goto success; 972 } 973 success: 974 free(journal_buffer); 975 free(zero_buffer); 976 977 return fs->curr_blkno; 978 fail: 979 free(journal_buffer); 980 free(zero_buffer); 981 982 return -1; 983 } 984 985 int ext4fs_get_new_inode_no(void) 986 { 987 short i; 988 short status; 989 unsigned int ibmap_idx; 990 static int prev_inode_bitmap_index = -1; 991 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group; 992 struct ext_filesystem *fs = get_fs(); 993 char *journal_buffer = zalloc(fs->blksz); 994 char *zero_buffer = zalloc(fs->blksz); 995 if (!journal_buffer || !zero_buffer) 996 goto fail; 997 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; 998 999 if (fs->first_pass_ibmap == 0) { 1000 for (i = 0; i < fs->no_blkgrp; i++) { 1001 if (bgd[i].free_inodes) { 1002 if (bgd[i].bg_itable_unused != 1003 bgd[i].free_inodes) 1004 bgd[i].bg_itable_unused = 1005 bgd[i].free_inodes; 1006 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) { 1007 put_ext4(((uint64_t) 1008 ((uint64_t)bgd[i].inode_id * 1009 (uint64_t)fs->blksz)), 1010 zero_buffer, fs->blksz); 1011 bgd[i].bg_flags = bgd[i].bg_flags & 1012 ~EXT4_BG_INODE_UNINIT; 1013 memcpy(fs->inode_bmaps[i], 1014 zero_buffer, fs->blksz); 1015 } 1016 fs->curr_inode_no = 1017 _get_new_inode_no(fs->inode_bmaps[i]); 1018 if (fs->curr_inode_no == -1) 1019 /* if block bitmap is completely fill */ 1020 continue; 1021 fs->curr_inode_no = fs->curr_inode_no + 1022 (i * inodes_per_grp); 1023 fs->first_pass_ibmap++; 1024 bgd[i].free_inodes--; 1025 bgd[i].bg_itable_unused--; 1026 fs->sb->free_inodes--; 1027 status = ext4fs_devread((lbaint_t) 1028 bgd[i].inode_id * 1029 fs->sect_perblk, 0, 1030 fs->blksz, 1031 journal_buffer); 1032 if (status == 0) 1033 goto fail; 1034 if (ext4fs_log_journal(journal_buffer, 1035 bgd[i].inode_id)) 1036 goto fail; 1037 goto success; 1038 } else 1039 debug("no inode left on block group %d\n", i); 1040 } 1041 goto fail; 1042 } else { 1043 restart: 1044 fs->curr_inode_no++; 1045 /* get the blockbitmap index respective to blockno */ 1046 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1047 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) { 1048 memset(zero_buffer, '\0', fs->blksz); 1049 put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id * 1050 (uint64_t)fs->blksz)), zero_buffer, 1051 fs->blksz); 1052 bgd[ibmap_idx].bg_flags = 1053 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT; 1054 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1055 fs->blksz); 1056 } 1057 1058 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1059 fs->inode_bmaps[ibmap_idx], 1060 ibmap_idx) != 0) { 1061 debug("going for restart for the block no %d %u\n", 1062 fs->curr_inode_no, ibmap_idx); 1063 goto restart; 1064 } 1065 1066 /* journal backup */ 1067 if (prev_inode_bitmap_index != ibmap_idx) { 1068 memset(journal_buffer, '\0', fs->blksz); 1069 status = ext4fs_devread((lbaint_t) 1070 bgd[ibmap_idx].inode_id 1071 * fs->sect_perblk, 1072 0, fs->blksz, journal_buffer); 1073 if (status == 0) 1074 goto fail; 1075 if (ext4fs_log_journal(journal_buffer, 1076 bgd[ibmap_idx].inode_id)) 1077 goto fail; 1078 prev_inode_bitmap_index = ibmap_idx; 1079 } 1080 if (bgd[ibmap_idx].bg_itable_unused != 1081 bgd[ibmap_idx].free_inodes) 1082 bgd[ibmap_idx].bg_itable_unused = 1083 bgd[ibmap_idx].free_inodes; 1084 bgd[ibmap_idx].free_inodes--; 1085 bgd[ibmap_idx].bg_itable_unused--; 1086 fs->sb->free_inodes--; 1087 goto success; 1088 } 1089 1090 success: 1091 free(journal_buffer); 1092 free(zero_buffer); 1093 1094 return fs->curr_inode_no; 1095 fail: 1096 free(journal_buffer); 1097 free(zero_buffer); 1098 1099 return -1; 1100 1101 } 1102 1103 1104 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1105 unsigned int *total_remaining_blocks, 1106 unsigned int *no_blks_reqd) 1107 { 1108 short i; 1109 short status; 1110 long int actual_block_no; 1111 long int si_blockno; 1112 /* si :single indirect */ 1113 unsigned int *si_buffer = NULL; 1114 unsigned int *si_start_addr = NULL; 1115 struct ext_filesystem *fs = get_fs(); 1116 1117 if (*total_remaining_blocks != 0) { 1118 si_buffer = zalloc(fs->blksz); 1119 if (!si_buffer) { 1120 printf("No Memory\n"); 1121 return; 1122 } 1123 si_start_addr = si_buffer; 1124 si_blockno = ext4fs_get_new_blk_no(); 1125 if (si_blockno == -1) { 1126 printf("no block left to assign\n"); 1127 goto fail; 1128 } 1129 (*no_blks_reqd)++; 1130 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1131 1132 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1133 0, fs->blksz, (char *)si_buffer); 1134 memset(si_buffer, '\0', fs->blksz); 1135 if (status == 0) 1136 goto fail; 1137 1138 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1139 actual_block_no = ext4fs_get_new_blk_no(); 1140 if (actual_block_no == -1) { 1141 printf("no block left to assign\n"); 1142 goto fail; 1143 } 1144 *si_buffer = actual_block_no; 1145 debug("SIAB %u: %u\n", *si_buffer, 1146 *total_remaining_blocks); 1147 1148 si_buffer++; 1149 (*total_remaining_blocks)--; 1150 if (*total_remaining_blocks == 0) 1151 break; 1152 } 1153 1154 /* write the block to disk */ 1155 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1156 si_start_addr, fs->blksz); 1157 file_inode->b.blocks.indir_block = si_blockno; 1158 } 1159 fail: 1160 free(si_start_addr); 1161 } 1162 1163 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1164 unsigned int *total_remaining_blocks, 1165 unsigned int *no_blks_reqd) 1166 { 1167 short i; 1168 short j; 1169 short status; 1170 long int actual_block_no; 1171 /* di:double indirect */ 1172 long int di_blockno_parent; 1173 long int di_blockno_child; 1174 unsigned int *di_parent_buffer = NULL; 1175 unsigned int *di_child_buff = NULL; 1176 unsigned int *di_block_start_addr = NULL; 1177 unsigned int *di_child_buff_start = NULL; 1178 struct ext_filesystem *fs = get_fs(); 1179 1180 if (*total_remaining_blocks != 0) { 1181 /* double indirect parent block connecting to inode */ 1182 di_blockno_parent = ext4fs_get_new_blk_no(); 1183 if (di_blockno_parent == -1) { 1184 printf("no block left to assign\n"); 1185 goto fail; 1186 } 1187 di_parent_buffer = zalloc(fs->blksz); 1188 if (!di_parent_buffer) 1189 goto fail; 1190 1191 di_block_start_addr = di_parent_buffer; 1192 (*no_blks_reqd)++; 1193 debug("DIPB %ld: %u\n", di_blockno_parent, 1194 *total_remaining_blocks); 1195 1196 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1197 fs->sect_perblk, 0, 1198 fs->blksz, (char *)di_parent_buffer); 1199 1200 if (!status) { 1201 printf("%s: Device read error!\n", __func__); 1202 goto fail; 1203 } 1204 memset(di_parent_buffer, '\0', fs->blksz); 1205 1206 /* 1207 * start:for each double indirect parent 1208 * block create one more block 1209 */ 1210 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1211 di_blockno_child = ext4fs_get_new_blk_no(); 1212 if (di_blockno_child == -1) { 1213 printf("no block left to assign\n"); 1214 goto fail; 1215 } 1216 di_child_buff = zalloc(fs->blksz); 1217 if (!di_child_buff) 1218 goto fail; 1219 1220 di_child_buff_start = di_child_buff; 1221 *di_parent_buffer = di_blockno_child; 1222 di_parent_buffer++; 1223 (*no_blks_reqd)++; 1224 debug("DICB %ld: %u\n", di_blockno_child, 1225 *total_remaining_blocks); 1226 1227 status = ext4fs_devread((lbaint_t)di_blockno_child * 1228 fs->sect_perblk, 0, 1229 fs->blksz, 1230 (char *)di_child_buff); 1231 1232 if (!status) { 1233 printf("%s: Device read error!\n", __func__); 1234 goto fail; 1235 } 1236 memset(di_child_buff, '\0', fs->blksz); 1237 /* filling of actual datablocks for each child */ 1238 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1239 actual_block_no = ext4fs_get_new_blk_no(); 1240 if (actual_block_no == -1) { 1241 printf("no block left to assign\n"); 1242 goto fail; 1243 } 1244 *di_child_buff = actual_block_no; 1245 debug("DIAB %ld: %u\n", actual_block_no, 1246 *total_remaining_blocks); 1247 1248 di_child_buff++; 1249 (*total_remaining_blocks)--; 1250 if (*total_remaining_blocks == 0) 1251 break; 1252 } 1253 /* write the block table */ 1254 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1255 di_child_buff_start, fs->blksz); 1256 free(di_child_buff_start); 1257 di_child_buff_start = NULL; 1258 1259 if (*total_remaining_blocks == 0) 1260 break; 1261 } 1262 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1263 di_block_start_addr, fs->blksz); 1264 file_inode->b.blocks.double_indir_block = di_blockno_parent; 1265 } 1266 fail: 1267 free(di_block_start_addr); 1268 } 1269 1270 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1271 unsigned int *total_remaining_blocks, 1272 unsigned int *no_blks_reqd) 1273 { 1274 short i; 1275 short j; 1276 short k; 1277 long int actual_block_no; 1278 /* ti: Triple Indirect */ 1279 long int ti_gp_blockno; 1280 long int ti_parent_blockno; 1281 long int ti_child_blockno; 1282 unsigned int *ti_gp_buff = NULL; 1283 unsigned int *ti_parent_buff = NULL; 1284 unsigned int *ti_child_buff = NULL; 1285 unsigned int *ti_gp_buff_start_addr = NULL; 1286 unsigned int *ti_pbuff_start_addr = NULL; 1287 unsigned int *ti_cbuff_start_addr = NULL; 1288 struct ext_filesystem *fs = get_fs(); 1289 if (*total_remaining_blocks != 0) { 1290 /* triple indirect grand parent block connecting to inode */ 1291 ti_gp_blockno = ext4fs_get_new_blk_no(); 1292 if (ti_gp_blockno == -1) { 1293 printf("no block left to assign\n"); 1294 goto fail; 1295 } 1296 ti_gp_buff = zalloc(fs->blksz); 1297 if (!ti_gp_buff) 1298 goto fail; 1299 1300 ti_gp_buff_start_addr = ti_gp_buff; 1301 (*no_blks_reqd)++; 1302 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1303 *total_remaining_blocks); 1304 1305 /* for each 4 byte grand parent entry create one more block */ 1306 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1307 ti_parent_blockno = ext4fs_get_new_blk_no(); 1308 if (ti_parent_blockno == -1) { 1309 printf("no block left to assign\n"); 1310 goto fail; 1311 } 1312 ti_parent_buff = zalloc(fs->blksz); 1313 if (!ti_parent_buff) 1314 goto fail; 1315 1316 ti_pbuff_start_addr = ti_parent_buff; 1317 *ti_gp_buff = ti_parent_blockno; 1318 ti_gp_buff++; 1319 (*no_blks_reqd)++; 1320 debug("TIPB %ld: %u\n", ti_parent_blockno, 1321 *total_remaining_blocks); 1322 1323 /* for each 4 byte entry parent create one more block */ 1324 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1325 ti_child_blockno = ext4fs_get_new_blk_no(); 1326 if (ti_child_blockno == -1) { 1327 printf("no block left assign\n"); 1328 goto fail; 1329 } 1330 ti_child_buff = zalloc(fs->blksz); 1331 if (!ti_child_buff) 1332 goto fail; 1333 1334 ti_cbuff_start_addr = ti_child_buff; 1335 *ti_parent_buff = ti_child_blockno; 1336 ti_parent_buff++; 1337 (*no_blks_reqd)++; 1338 debug("TICB %ld: %u\n", ti_parent_blockno, 1339 *total_remaining_blocks); 1340 1341 /* fill actual datablocks for each child */ 1342 for (k = 0; k < (fs->blksz / sizeof(int)); 1343 k++) { 1344 actual_block_no = 1345 ext4fs_get_new_blk_no(); 1346 if (actual_block_no == -1) { 1347 printf("no block left\n"); 1348 goto fail; 1349 } 1350 *ti_child_buff = actual_block_no; 1351 debug("TIAB %ld: %u\n", actual_block_no, 1352 *total_remaining_blocks); 1353 1354 ti_child_buff++; 1355 (*total_remaining_blocks)--; 1356 if (*total_remaining_blocks == 0) 1357 break; 1358 } 1359 /* write the child block */ 1360 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1361 (uint64_t)fs->blksz)), 1362 ti_cbuff_start_addr, fs->blksz); 1363 free(ti_cbuff_start_addr); 1364 1365 if (*total_remaining_blocks == 0) 1366 break; 1367 } 1368 /* write the parent block */ 1369 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1370 ti_pbuff_start_addr, fs->blksz); 1371 free(ti_pbuff_start_addr); 1372 1373 if (*total_remaining_blocks == 0) 1374 break; 1375 } 1376 /* write the grand parent block */ 1377 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1378 ti_gp_buff_start_addr, fs->blksz); 1379 file_inode->b.blocks.triple_indir_block = ti_gp_blockno; 1380 } 1381 fail: 1382 free(ti_gp_buff_start_addr); 1383 } 1384 1385 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1386 unsigned int total_remaining_blocks, 1387 unsigned int *total_no_of_block) 1388 { 1389 short i; 1390 long int direct_blockno; 1391 unsigned int no_blks_reqd = 0; 1392 1393 /* allocation of direct blocks */ 1394 for (i = 0; i < INDIRECT_BLOCKS; i++) { 1395 direct_blockno = ext4fs_get_new_blk_no(); 1396 if (direct_blockno == -1) { 1397 printf("no block left to assign\n"); 1398 return; 1399 } 1400 file_inode->b.blocks.dir_blocks[i] = direct_blockno; 1401 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1402 1403 total_remaining_blocks--; 1404 if (total_remaining_blocks == 0) 1405 break; 1406 } 1407 1408 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1409 &no_blks_reqd); 1410 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1411 &no_blks_reqd); 1412 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1413 &no_blks_reqd); 1414 *total_no_of_block += no_blks_reqd; 1415 } 1416 1417 #endif 1418 1419 static void ext4fs_extent_cache_insert(struct ext4_extent_node *new) 1420 { 1421 struct ext4_extent_node *node; 1422 1423 list_for_each_entry(node, &ext4_extent_lh, lh) 1424 if (node->block > new->block) { 1425 list_add_tail(&new->lh, &node->lh); 1426 return; 1427 } 1428 list_add_tail(&new->lh, &ext4_extent_lh); 1429 } 1430 1431 static int __ext4fs_build_extent_cache(struct ext2_data *data, 1432 struct ext4_extent_header *ext_block) 1433 { 1434 int blksz = EXT2_BLOCK_SIZE(data); 1435 int log2_blksz = LOG2_BLOCK_SIZE(data) 1436 - get_fs()->dev_desc->log2blksz; 1437 struct ext4_extent_node *node; 1438 struct ext4_extent_idx *index; 1439 struct ext4_extent *extent; 1440 unsigned long long block; 1441 char *buf; 1442 int i, err; 1443 1444 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1445 return -EINVAL; 1446 1447 if (ext_block->eh_depth == 0) { 1448 extent = (struct ext4_extent *)(ext_block + 1); 1449 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { 1450 node = malloc(sizeof(*node)); 1451 if (!node) 1452 return -ENOMEM; 1453 node->block = le32_to_cpu(extent[i].ee_block); 1454 node->len = le16_to_cpu(extent[i].ee_len); 1455 node->start = le16_to_cpu(extent[i].ee_start_hi); 1456 node->start = (node->start << 32) + 1457 le32_to_cpu(extent[i].ee_start_lo); 1458 ext4fs_extent_cache_insert(node); 1459 } 1460 return 0; 1461 } 1462 1463 index = (struct ext4_extent_idx *)(ext_block + 1); 1464 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { 1465 buf = malloc(blksz); 1466 if (!buf) 1467 return -ENOMEM; 1468 1469 block = le16_to_cpu(index[i].ei_leaf_hi); 1470 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1471 1472 if (!ext4fs_devread(block << log2_blksz, 0, blksz, buf)) { 1473 free(buf); 1474 return -EIO; 1475 } 1476 1477 err = __ext4fs_build_extent_cache(data, 1478 (struct ext4_extent_header *) buf); 1479 free(buf); 1480 if (err < 0) 1481 return err; 1482 } 1483 1484 return 0; 1485 } 1486 1487 int ext4fs_build_extent_cache(struct ext2_inode *inode) 1488 { 1489 return __ext4fs_build_extent_cache(ext4fs_root, 1490 (struct ext4_extent_header *) 1491 inode->b.blocks.dir_blocks); 1492 } 1493 1494 void ext4fs_free_extent_cache(void) 1495 { 1496 struct ext4_extent_node *node, *tmp; 1497 1498 list_for_each_entry_safe(node, tmp, &ext4_extent_lh, lh) { 1499 list_del(&node->lh); 1500 free(node); 1501 } 1502 } 1503 1504 static struct ext4_extent_node *ext4fs_extent_cache_get(uint32_t block) 1505 { 1506 struct ext4_extent_node *node; 1507 1508 list_for_each_entry(node, &ext4_extent_lh, lh) 1509 if (block >= node->block && block < node->block + node->len) 1510 return node; 1511 1512 return NULL; 1513 } 1514 1515 static int ext4fs_blockgroup 1516 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1517 { 1518 long int blkno; 1519 unsigned int blkoff, desc_per_blk; 1520 int log2blksz = get_fs()->dev_desc->log2blksz; 1521 1522 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); 1523 1524 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 + 1525 group / desc_per_blk; 1526 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); 1527 1528 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1529 group, blkno, blkoff); 1530 1531 return ext4fs_devread((lbaint_t)blkno << 1532 (LOG2_BLOCK_SIZE(data) - log2blksz), 1533 blkoff, sizeof(struct ext2_block_group), 1534 (char *)blkgrp); 1535 } 1536 1537 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1538 { 1539 struct ext2_block_group blkgrp; 1540 struct ext2_sblock *sblock = &data->sblock; 1541 struct ext_filesystem *fs = get_fs(); 1542 int log2blksz = get_fs()->dev_desc->log2blksz; 1543 int inodes_per_block, status; 1544 long int blkno; 1545 unsigned int blkoff; 1546 1547 /* It is easier to calculate if the first inode is 0. */ 1548 ino--; 1549 status = ext4fs_blockgroup(data, ino / __le32_to_cpu 1550 (sblock->inodes_per_group), &blkgrp); 1551 if (status == 0) 1552 return 0; 1553 1554 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1555 blkno = __le32_to_cpu(blkgrp.inode_table_id) + 1556 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1557 blkoff = (ino % inodes_per_block) * fs->inodesz; 1558 /* Read the inode. */ 1559 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1560 log2blksz), blkoff, 1561 sizeof(struct ext2_inode), (char *)inode); 1562 if (status == 0) 1563 return 0; 1564 1565 return 1; 1566 } 1567 1568 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1569 { 1570 long int blknr; 1571 int blksz; 1572 int log2_blksz; 1573 int status; 1574 long int rblock; 1575 long int perblock_parent; 1576 long int perblock_child; 1577 1578 /* get the blocksize of the filesystem */ 1579 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1580 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1581 - get_fs()->dev_desc->log2blksz; 1582 1583 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1584 struct ext4_extent_node *node; 1585 1586 node = ext4fs_extent_cache_get(fileblock); 1587 if (!node) { 1588 printf("Extent Error\n"); 1589 return -1; 1590 } 1591 1592 return fileblock - node->block + node->start; 1593 } 1594 1595 /* Direct blocks. */ 1596 if (fileblock < INDIRECT_BLOCKS) 1597 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1598 1599 /* Indirect. */ 1600 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1601 if (ext4fs_indir1_block == NULL) { 1602 ext4fs_indir1_block = zalloc(blksz); 1603 if (ext4fs_indir1_block == NULL) { 1604 printf("** SI ext2fs read block (indir 1)" 1605 "malloc failed. **\n"); 1606 return -1; 1607 } 1608 ext4fs_indir1_size = blksz; 1609 ext4fs_indir1_blkno = -1; 1610 } 1611 if (blksz != ext4fs_indir1_size) { 1612 free(ext4fs_indir1_block); 1613 ext4fs_indir1_block = NULL; 1614 ext4fs_indir1_size = 0; 1615 ext4fs_indir1_blkno = -1; 1616 ext4fs_indir1_block = zalloc(blksz); 1617 if (ext4fs_indir1_block == NULL) { 1618 printf("** SI ext2fs read block (indir 1):" 1619 "malloc failed. **\n"); 1620 return -1; 1621 } 1622 ext4fs_indir1_size = blksz; 1623 } 1624 if ((__le32_to_cpu(inode->b.blocks.indir_block) << 1625 log2_blksz) != ext4fs_indir1_blkno) { 1626 status = 1627 ext4fs_devread((lbaint_t)__le32_to_cpu 1628 (inode->b.blocks. 1629 indir_block) << log2_blksz, 0, 1630 blksz, (char *)ext4fs_indir1_block); 1631 if (status == 0) { 1632 printf("** SI ext2fs read block (indir 1)" 1633 "failed. **\n"); 1634 return 0; 1635 } 1636 ext4fs_indir1_blkno = 1637 __le32_to_cpu(inode->b.blocks. 1638 indir_block) << log2_blksz; 1639 } 1640 blknr = __le32_to_cpu(ext4fs_indir1_block 1641 [fileblock - INDIRECT_BLOCKS]); 1642 } 1643 /* Double indirect. */ 1644 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1645 (blksz / 4 + 1)))) { 1646 1647 long int perblock = blksz / 4; 1648 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1649 1650 if (ext4fs_indir1_block == NULL) { 1651 ext4fs_indir1_block = zalloc(blksz); 1652 if (ext4fs_indir1_block == NULL) { 1653 printf("** DI ext2fs read block (indir 2 1)" 1654 "malloc failed. **\n"); 1655 return -1; 1656 } 1657 ext4fs_indir1_size = blksz; 1658 ext4fs_indir1_blkno = -1; 1659 } 1660 if (blksz != ext4fs_indir1_size) { 1661 free(ext4fs_indir1_block); 1662 ext4fs_indir1_block = NULL; 1663 ext4fs_indir1_size = 0; 1664 ext4fs_indir1_blkno = -1; 1665 ext4fs_indir1_block = zalloc(blksz); 1666 if (ext4fs_indir1_block == NULL) { 1667 printf("** DI ext2fs read block (indir 2 1)" 1668 "malloc failed. **\n"); 1669 return -1; 1670 } 1671 ext4fs_indir1_size = blksz; 1672 } 1673 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) << 1674 log2_blksz) != ext4fs_indir1_blkno) { 1675 status = 1676 ext4fs_devread((lbaint_t)__le32_to_cpu 1677 (inode->b.blocks. 1678 double_indir_block) << log2_blksz, 1679 0, blksz, 1680 (char *)ext4fs_indir1_block); 1681 if (status == 0) { 1682 printf("** DI ext2fs read block (indir 2 1)" 1683 "failed. **\n"); 1684 return -1; 1685 } 1686 ext4fs_indir1_blkno = 1687 __le32_to_cpu(inode->b.blocks.double_indir_block) << 1688 log2_blksz; 1689 } 1690 1691 if (ext4fs_indir2_block == NULL) { 1692 ext4fs_indir2_block = zalloc(blksz); 1693 if (ext4fs_indir2_block == NULL) { 1694 printf("** DI ext2fs read block (indir 2 2)" 1695 "malloc failed. **\n"); 1696 return -1; 1697 } 1698 ext4fs_indir2_size = blksz; 1699 ext4fs_indir2_blkno = -1; 1700 } 1701 if (blksz != ext4fs_indir2_size) { 1702 free(ext4fs_indir2_block); 1703 ext4fs_indir2_block = NULL; 1704 ext4fs_indir2_size = 0; 1705 ext4fs_indir2_blkno = -1; 1706 ext4fs_indir2_block = zalloc(blksz); 1707 if (ext4fs_indir2_block == NULL) { 1708 printf("** DI ext2fs read block (indir 2 2)" 1709 "malloc failed. **\n"); 1710 return -1; 1711 } 1712 ext4fs_indir2_size = blksz; 1713 } 1714 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1715 log2_blksz) != ext4fs_indir2_blkno) { 1716 status = ext4fs_devread((lbaint_t)__le32_to_cpu 1717 (ext4fs_indir1_block 1718 [rblock / 1719 perblock]) << log2_blksz, 0, 1720 blksz, 1721 (char *)ext4fs_indir2_block); 1722 if (status == 0) { 1723 printf("** DI ext2fs read block (indir 2 2)" 1724 "failed. **\n"); 1725 return -1; 1726 } 1727 ext4fs_indir2_blkno = 1728 __le32_to_cpu(ext4fs_indir1_block[rblock 1729 / 1730 perblock]) << 1731 log2_blksz; 1732 } 1733 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1734 } 1735 /* Tripple indirect. */ 1736 else { 1737 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1738 (blksz / 4 * blksz / 4)); 1739 perblock_child = blksz / 4; 1740 perblock_parent = ((blksz / 4) * (blksz / 4)); 1741 1742 if (ext4fs_indir1_block == NULL) { 1743 ext4fs_indir1_block = zalloc(blksz); 1744 if (ext4fs_indir1_block == NULL) { 1745 printf("** TI ext2fs read block (indir 2 1)" 1746 "malloc failed. **\n"); 1747 return -1; 1748 } 1749 ext4fs_indir1_size = blksz; 1750 ext4fs_indir1_blkno = -1; 1751 } 1752 if (blksz != ext4fs_indir1_size) { 1753 free(ext4fs_indir1_block); 1754 ext4fs_indir1_block = NULL; 1755 ext4fs_indir1_size = 0; 1756 ext4fs_indir1_blkno = -1; 1757 ext4fs_indir1_block = zalloc(blksz); 1758 if (ext4fs_indir1_block == NULL) { 1759 printf("** TI ext2fs read block (indir 2 1)" 1760 "malloc failed. **\n"); 1761 return -1; 1762 } 1763 ext4fs_indir1_size = blksz; 1764 } 1765 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) << 1766 log2_blksz) != ext4fs_indir1_blkno) { 1767 status = ext4fs_devread 1768 ((lbaint_t) 1769 __le32_to_cpu(inode->b.blocks.triple_indir_block) 1770 << log2_blksz, 0, blksz, 1771 (char *)ext4fs_indir1_block); 1772 if (status == 0) { 1773 printf("** TI ext2fs read block (indir 2 1)" 1774 "failed. **\n"); 1775 return -1; 1776 } 1777 ext4fs_indir1_blkno = 1778 __le32_to_cpu(inode->b.blocks.triple_indir_block) << 1779 log2_blksz; 1780 } 1781 1782 if (ext4fs_indir2_block == NULL) { 1783 ext4fs_indir2_block = zalloc(blksz); 1784 if (ext4fs_indir2_block == NULL) { 1785 printf("** TI ext2fs read block (indir 2 2)" 1786 "malloc failed. **\n"); 1787 return -1; 1788 } 1789 ext4fs_indir2_size = blksz; 1790 ext4fs_indir2_blkno = -1; 1791 } 1792 if (blksz != ext4fs_indir2_size) { 1793 free(ext4fs_indir2_block); 1794 ext4fs_indir2_block = NULL; 1795 ext4fs_indir2_size = 0; 1796 ext4fs_indir2_blkno = -1; 1797 ext4fs_indir2_block = zalloc(blksz); 1798 if (ext4fs_indir2_block == NULL) { 1799 printf("** TI ext2fs read block (indir 2 2)" 1800 "malloc failed. **\n"); 1801 return -1; 1802 } 1803 ext4fs_indir2_size = blksz; 1804 } 1805 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / 1806 perblock_parent]) << 1807 log2_blksz) 1808 != ext4fs_indir2_blkno) { 1809 status = ext4fs_devread((lbaint_t)__le32_to_cpu 1810 (ext4fs_indir1_block 1811 [rblock / 1812 perblock_parent]) << 1813 log2_blksz, 0, blksz, 1814 (char *)ext4fs_indir2_block); 1815 if (status == 0) { 1816 printf("** TI ext2fs read block (indir 2 2)" 1817 "failed. **\n"); 1818 return -1; 1819 } 1820 ext4fs_indir2_blkno = 1821 __le32_to_cpu(ext4fs_indir1_block[rblock / 1822 perblock_parent]) 1823 << log2_blksz; 1824 } 1825 1826 if (ext4fs_indir3_block == NULL) { 1827 ext4fs_indir3_block = zalloc(blksz); 1828 if (ext4fs_indir3_block == NULL) { 1829 printf("** TI ext2fs read block (indir 2 2)" 1830 "malloc failed. **\n"); 1831 return -1; 1832 } 1833 ext4fs_indir3_size = blksz; 1834 ext4fs_indir3_blkno = -1; 1835 } 1836 if (blksz != ext4fs_indir3_size) { 1837 free(ext4fs_indir3_block); 1838 ext4fs_indir3_block = NULL; 1839 ext4fs_indir3_size = 0; 1840 ext4fs_indir3_blkno = -1; 1841 ext4fs_indir3_block = zalloc(blksz); 1842 if (ext4fs_indir3_block == NULL) { 1843 printf("** TI ext2fs read block (indir 2 2)" 1844 "malloc failed. **\n"); 1845 return -1; 1846 } 1847 ext4fs_indir3_size = blksz; 1848 } 1849 if ((__le32_to_cpu(ext4fs_indir2_block[rblock 1850 / 1851 perblock_child]) << 1852 log2_blksz) != ext4fs_indir3_blkno) { 1853 status = 1854 ext4fs_devread((lbaint_t)__le32_to_cpu 1855 (ext4fs_indir2_block 1856 [(rblock / perblock_child) 1857 % (blksz / 4)]) << log2_blksz, 0, 1858 blksz, (char *)ext4fs_indir3_block); 1859 if (status == 0) { 1860 printf("** TI ext2fs read block (indir 2 2)" 1861 "failed. **\n"); 1862 return -1; 1863 } 1864 ext4fs_indir3_blkno = 1865 __le32_to_cpu(ext4fs_indir2_block[(rblock / 1866 perblock_child) % 1867 (blksz / 1868 4)]) << 1869 log2_blksz; 1870 } 1871 1872 blknr = __le32_to_cpu(ext4fs_indir3_block 1873 [rblock % perblock_child]); 1874 } 1875 debug("read_allocated_block %ld\n", blknr); 1876 1877 return blknr; 1878 } 1879 1880 void ext4fs_close(void) 1881 { 1882 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1883 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1884 ext4fs_file = NULL; 1885 } 1886 if (ext4fs_root != NULL) { 1887 free(ext4fs_root); 1888 ext4fs_root = NULL; 1889 } 1890 if (ext4fs_indir1_block != NULL) { 1891 free(ext4fs_indir1_block); 1892 ext4fs_indir1_block = NULL; 1893 ext4fs_indir1_size = 0; 1894 ext4fs_indir1_blkno = -1; 1895 } 1896 if (ext4fs_indir2_block != NULL) { 1897 free(ext4fs_indir2_block); 1898 ext4fs_indir2_block = NULL; 1899 ext4fs_indir2_size = 0; 1900 ext4fs_indir2_blkno = -1; 1901 } 1902 if (ext4fs_indir3_block != NULL) { 1903 free(ext4fs_indir3_block); 1904 ext4fs_indir3_block = NULL; 1905 ext4fs_indir3_size = 0; 1906 ext4fs_indir3_blkno = -1; 1907 } 1908 } 1909 1910 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 1911 struct ext2fs_node **fnode, int *ftype) 1912 { 1913 unsigned int fpos = 0; 1914 int status; 1915 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 1916 1917 #ifdef DEBUG 1918 if (name != NULL) 1919 printf("Iterate dir %s\n", name); 1920 #endif /* of DEBUG */ 1921 if (!diro->inode_read) { 1922 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 1923 if (status == 0) 1924 return 0; 1925 } 1926 /* Search the file. */ 1927 while (fpos < __le32_to_cpu(diro->inode.size)) { 1928 struct ext2_dirent dirent; 1929 1930 status = ext4fs_read_file(diro, fpos, 1931 sizeof(struct ext2_dirent), 1932 (char *) &dirent); 1933 if (status < 1) 1934 return 0; 1935 1936 if (dirent.namelen != 0) { 1937 char filename[dirent.namelen + 1]; 1938 struct ext2fs_node *fdiro; 1939 int type = FILETYPE_UNKNOWN; 1940 1941 status = ext4fs_read_file(diro, 1942 fpos + 1943 sizeof(struct ext2_dirent), 1944 dirent.namelen, filename); 1945 if (status < 1) 1946 return 0; 1947 1948 fdiro = zalloc(sizeof(struct ext2fs_node)); 1949 if (!fdiro) 1950 return 0; 1951 1952 fdiro->data = diro->data; 1953 fdiro->ino = __le32_to_cpu(dirent.inode); 1954 1955 filename[dirent.namelen] = '\0'; 1956 1957 if (dirent.filetype != FILETYPE_UNKNOWN) { 1958 fdiro->inode_read = 0; 1959 1960 if (dirent.filetype == FILETYPE_DIRECTORY) 1961 type = FILETYPE_DIRECTORY; 1962 else if (dirent.filetype == FILETYPE_SYMLINK) 1963 type = FILETYPE_SYMLINK; 1964 else if (dirent.filetype == FILETYPE_REG) 1965 type = FILETYPE_REG; 1966 } else { 1967 status = ext4fs_read_inode(diro->data, 1968 __le32_to_cpu 1969 (dirent.inode), 1970 &fdiro->inode); 1971 if (status == 0) { 1972 free(fdiro); 1973 return 0; 1974 } 1975 fdiro->inode_read = 1; 1976 1977 if ((__le16_to_cpu(fdiro->inode.mode) & 1978 FILETYPE_INO_MASK) == 1979 FILETYPE_INO_DIRECTORY) { 1980 type = FILETYPE_DIRECTORY; 1981 } else if ((__le16_to_cpu(fdiro->inode.mode) 1982 & FILETYPE_INO_MASK) == 1983 FILETYPE_INO_SYMLINK) { 1984 type = FILETYPE_SYMLINK; 1985 } else if ((__le16_to_cpu(fdiro->inode.mode) 1986 & FILETYPE_INO_MASK) == 1987 FILETYPE_INO_REG) { 1988 type = FILETYPE_REG; 1989 } 1990 } 1991 #ifdef DEBUG 1992 printf("iterate >%s<\n", filename); 1993 #endif /* of DEBUG */ 1994 if ((name != NULL) && (fnode != NULL) 1995 && (ftype != NULL)) { 1996 if (strcmp(filename, name) == 0) { 1997 *ftype = type; 1998 *fnode = fdiro; 1999 return 1; 2000 } 2001 } else { 2002 if (fdiro->inode_read == 0) { 2003 status = ext4fs_read_inode(diro->data, 2004 __le32_to_cpu( 2005 dirent.inode), 2006 &fdiro->inode); 2007 if (status == 0) { 2008 free(fdiro); 2009 return 0; 2010 } 2011 fdiro->inode_read = 1; 2012 } 2013 switch (type) { 2014 case FILETYPE_DIRECTORY: 2015 printf("<DIR> "); 2016 break; 2017 case FILETYPE_SYMLINK: 2018 printf("<SYM> "); 2019 break; 2020 case FILETYPE_REG: 2021 printf(" "); 2022 break; 2023 default: 2024 printf("< ? > "); 2025 break; 2026 } 2027 printf("%10d %s\n", 2028 __le32_to_cpu(fdiro->inode.size), 2029 filename); 2030 } 2031 free(fdiro); 2032 } 2033 fpos += __le16_to_cpu(dirent.direntlen); 2034 } 2035 return 0; 2036 } 2037 2038 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2039 { 2040 char *symlink; 2041 struct ext2fs_node *diro = node; 2042 int status; 2043 2044 if (!diro->inode_read) { 2045 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2046 if (status == 0) 2047 return 0; 2048 } 2049 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1); 2050 if (!symlink) 2051 return 0; 2052 2053 if (__le32_to_cpu(diro->inode.size) <= 60) { 2054 strncpy(symlink, diro->inode.b.symlink, 2055 __le32_to_cpu(diro->inode.size)); 2056 } else { 2057 status = ext4fs_read_file(diro, 0, 2058 __le32_to_cpu(diro->inode.size), 2059 symlink); 2060 if (status == 0) { 2061 free(symlink); 2062 return 0; 2063 } 2064 } 2065 symlink[__le32_to_cpu(diro->inode.size)] = '\0'; 2066 return symlink; 2067 } 2068 2069 static int ext4fs_find_file1(const char *currpath, 2070 struct ext2fs_node *currroot, 2071 struct ext2fs_node **currfound, int *foundtype) 2072 { 2073 char fpath[strlen(currpath) + 1]; 2074 char *name = fpath; 2075 char *next; 2076 int status; 2077 int type = FILETYPE_DIRECTORY; 2078 struct ext2fs_node *currnode = currroot; 2079 struct ext2fs_node *oldnode = currroot; 2080 2081 strncpy(fpath, currpath, strlen(currpath) + 1); 2082 2083 /* Remove all leading slashes. */ 2084 while (*name == '/') 2085 name++; 2086 2087 if (!*name) { 2088 *currfound = currnode; 2089 return 1; 2090 } 2091 2092 for (;;) { 2093 int found; 2094 2095 /* Extract the actual part from the pathname. */ 2096 next = strchr(name, '/'); 2097 if (next) { 2098 /* Remove all leading slashes. */ 2099 while (*next == '/') 2100 *(next++) = '\0'; 2101 } 2102 2103 if (type != FILETYPE_DIRECTORY) { 2104 ext4fs_free_node(currnode, currroot); 2105 return 0; 2106 } 2107 2108 oldnode = currnode; 2109 2110 /* Iterate over the directory. */ 2111 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2112 if (found == 0) 2113 return 0; 2114 2115 if (found == -1) 2116 break; 2117 2118 /* Read in the symlink and follow it. */ 2119 if (type == FILETYPE_SYMLINK) { 2120 char *symlink; 2121 2122 /* Test if the symlink does not loop. */ 2123 if (++symlinknest == 8) { 2124 ext4fs_free_node(currnode, currroot); 2125 ext4fs_free_node(oldnode, currroot); 2126 return 0; 2127 } 2128 2129 symlink = ext4fs_read_symlink(currnode); 2130 ext4fs_free_node(currnode, currroot); 2131 2132 if (!symlink) { 2133 ext4fs_free_node(oldnode, currroot); 2134 return 0; 2135 } 2136 2137 debug("Got symlink >%s<\n", symlink); 2138 2139 if (symlink[0] == '/') { 2140 ext4fs_free_node(oldnode, currroot); 2141 oldnode = &ext4fs_root->diropen; 2142 } 2143 2144 /* Lookup the node the symlink points to. */ 2145 status = ext4fs_find_file1(symlink, oldnode, 2146 &currnode, &type); 2147 2148 free(symlink); 2149 2150 if (status == 0) { 2151 ext4fs_free_node(oldnode, currroot); 2152 return 0; 2153 } 2154 } 2155 2156 ext4fs_free_node(oldnode, currroot); 2157 2158 /* Found the node! */ 2159 if (!next || *next == '\0') { 2160 *currfound = currnode; 2161 *foundtype = type; 2162 return 1; 2163 } 2164 name = next; 2165 } 2166 return -1; 2167 } 2168 2169 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2170 struct ext2fs_node **foundnode, int expecttype) 2171 { 2172 int status; 2173 int foundtype = FILETYPE_DIRECTORY; 2174 2175 symlinknest = 0; 2176 if (!path) 2177 return 0; 2178 2179 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2180 if (status == 0) 2181 return 0; 2182 2183 /* Check if the node that was found was of the expected type. */ 2184 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2185 return 0; 2186 else if ((expecttype == FILETYPE_DIRECTORY) 2187 && (foundtype != expecttype)) 2188 return 0; 2189 2190 return 1; 2191 } 2192 2193 int ext4fs_open(const char *filename) 2194 { 2195 struct ext2fs_node *fdiro = NULL; 2196 int status; 2197 int len; 2198 2199 if (ext4fs_root == NULL) 2200 return -1; 2201 2202 ext4fs_file = NULL; 2203 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2204 FILETYPE_REG); 2205 if (status == 0) 2206 goto fail; 2207 2208 if (!fdiro->inode_read) { 2209 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2210 &fdiro->inode); 2211 if (status == 0) 2212 goto fail; 2213 } 2214 len = __le32_to_cpu(fdiro->inode.size); 2215 ext4fs_file = fdiro; 2216 2217 return len; 2218 fail: 2219 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2220 2221 return -1; 2222 } 2223 2224 int ext4fs_mount(unsigned part_length) 2225 { 2226 struct ext2_data *data; 2227 int status; 2228 struct ext_filesystem *fs = get_fs(); 2229 data = zalloc(SUPERBLOCK_SIZE); 2230 if (!data) 2231 return 0; 2232 2233 /* Read the superblock. */ 2234 status = ext4_read_superblock((char *)&data->sblock); 2235 2236 if (status == 0) 2237 goto fail; 2238 2239 /* Make sure this is an ext2 filesystem. */ 2240 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2241 goto fail; 2242 2243 if (__le32_to_cpu(data->sblock.revision_level == 0)) 2244 fs->inodesz = 128; 2245 else 2246 fs->inodesz = __le16_to_cpu(data->sblock.inode_size); 2247 2248 debug("EXT2 rev %d, inode_size %d\n", 2249 __le32_to_cpu(data->sblock.revision_level), fs->inodesz); 2250 2251 data->diropen.data = data; 2252 data->diropen.ino = 2; 2253 data->diropen.inode_read = 1; 2254 data->inode = &data->diropen.inode; 2255 2256 status = ext4fs_read_inode(data, 2, data->inode); 2257 if (status == 0) 2258 goto fail; 2259 2260 ext4fs_root = data; 2261 2262 return 1; 2263 fail: 2264 printf("Failed to mount ext2 filesystem...\n"); 2265 free(data); 2266 ext4fs_root = NULL; 2267 2268 return 0; 2269 } 2270