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 <inttypes.h> 26 #include <malloc.h> 27 #include <memalign.h> 28 #include <stddef.h> 29 #include <linux/stat.h> 30 #include <linux/time.h> 31 #include <asm/byteorder.h> 32 #include "ext4_common.h" 33 34 struct ext2_data *ext4fs_root; 35 struct ext2fs_node *ext4fs_file; 36 __le32 *ext4fs_indir1_block; 37 int ext4fs_indir1_size; 38 int ext4fs_indir1_blkno = -1; 39 __le32 *ext4fs_indir2_block; 40 int ext4fs_indir2_size; 41 int ext4fs_indir2_blkno = -1; 42 43 __le32 *ext4fs_indir3_block; 44 int ext4fs_indir3_size; 45 int ext4fs_indir3_blkno = -1; 46 struct ext2_inode *g_parent_inode; 47 static int symlinknest; 48 49 #if defined(CONFIG_EXT4_WRITE) 50 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb) 51 { 52 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1); 53 } 54 55 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb) 56 { 57 sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) - 1); 58 } 59 60 static inline void ext4fs_bg_free_inodes_dec(struct ext2_block_group *bg) 61 { 62 bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) - 1); 63 } 64 65 static inline void ext4fs_bg_free_blocks_dec(struct ext2_block_group *bg) 66 { 67 bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) - 1); 68 } 69 70 static inline void ext4fs_bg_itable_unused_dec(struct ext2_block_group *bg) 71 { 72 bg->bg_itable_unused = cpu_to_le16(le16_to_cpu(bg->bg_itable_unused) - 1); 73 } 74 75 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) 76 { 77 uint32_t res = size / n; 78 if (res * n != size) 79 res++; 80 81 return res; 82 } 83 84 void put_ext4(uint64_t off, void *buf, uint32_t size) 85 { 86 uint64_t startblock; 87 uint64_t remainder; 88 unsigned char *temp_ptr = NULL; 89 struct ext_filesystem *fs = get_fs(); 90 int log2blksz = fs->dev_desc->log2blksz; 91 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); 92 93 startblock = off >> log2blksz; 94 startblock += part_offset; 95 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); 96 97 if (fs->dev_desc == NULL) 98 return; 99 100 if ((startblock + (size >> log2blksz)) > 101 (part_offset + fs->total_sect)) { 102 printf("part_offset is " LBAFU "\n", part_offset); 103 printf("total_sector is %" PRIu64 "\n", fs->total_sect); 104 printf("error: overflow occurs\n"); 105 return; 106 } 107 108 if (remainder) { 109 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 110 temp_ptr = sec_buf; 111 memcpy((temp_ptr + remainder), (unsigned char *)buf, size); 112 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf); 113 } else { 114 if (size >> log2blksz != 0) { 115 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, 116 (unsigned long *)buf); 117 } else { 118 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 119 temp_ptr = sec_buf; 120 memcpy(temp_ptr, buf, size); 121 blk_dwrite(fs->dev_desc, startblock, 1, 122 (unsigned long *)sec_buf); 123 } 124 } 125 } 126 127 static int _get_new_inode_no(unsigned char *buffer) 128 { 129 struct ext_filesystem *fs = get_fs(); 130 unsigned char input; 131 int operand, status; 132 int count = 1; 133 int j = 0; 134 135 /* get the blocksize of the filesystem */ 136 unsigned char *ptr = buffer; 137 while (*ptr == 255) { 138 ptr++; 139 count += 8; 140 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) 141 return -1; 142 } 143 144 for (j = 0; j < fs->blksz; j++) { 145 input = *ptr; 146 int i = 0; 147 while (i <= 7) { 148 operand = 1 << i; 149 status = input & operand; 150 if (status) { 151 i++; 152 count++; 153 } else { 154 *ptr |= operand; 155 return count; 156 } 157 } 158 ptr = ptr + 1; 159 } 160 161 return -1; 162 } 163 164 static int _get_new_blk_no(unsigned char *buffer) 165 { 166 unsigned char input; 167 int operand, status; 168 int count = 0; 169 int j = 0; 170 unsigned char *ptr = buffer; 171 struct ext_filesystem *fs = get_fs(); 172 173 if (fs->blksz != 1024) 174 count = 0; 175 else 176 count = 1; 177 178 while (*ptr == 255) { 179 ptr++; 180 count += 8; 181 if (count == (fs->blksz * 8)) 182 return -1; 183 } 184 185 for (j = 0; j < fs->blksz; j++) { 186 input = *ptr; 187 int i = 0; 188 while (i <= 7) { 189 operand = 1 << i; 190 status = input & operand; 191 if (status) { 192 i++; 193 count++; 194 } else { 195 *ptr |= operand; 196 return count; 197 } 198 } 199 ptr = ptr + 1; 200 } 201 202 return -1; 203 } 204 205 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) 206 { 207 int i, remainder, status; 208 unsigned char *ptr = buffer; 209 unsigned char operand; 210 i = blockno / 8; 211 remainder = blockno % 8; 212 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 213 214 i = i - (index * blocksize); 215 if (blocksize != 1024) { 216 ptr = ptr + i; 217 operand = 1 << remainder; 218 status = *ptr & operand; 219 if (status) 220 return -1; 221 222 *ptr = *ptr | operand; 223 return 0; 224 } else { 225 if (remainder == 0) { 226 ptr = ptr + i - 1; 227 operand = (1 << 7); 228 } else { 229 ptr = ptr + i; 230 operand = (1 << (remainder - 1)); 231 } 232 status = *ptr & operand; 233 if (status) 234 return -1; 235 236 *ptr = *ptr | operand; 237 return 0; 238 } 239 } 240 241 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) 242 { 243 int i, remainder, status; 244 unsigned char *ptr = buffer; 245 unsigned char operand; 246 i = blockno / 8; 247 remainder = blockno % 8; 248 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 249 250 i = i - (index * blocksize); 251 if (blocksize != 1024) { 252 ptr = ptr + i; 253 operand = (1 << remainder); 254 status = *ptr & operand; 255 if (status) 256 *ptr = *ptr & ~(operand); 257 } else { 258 if (remainder == 0) { 259 ptr = ptr + i - 1; 260 operand = (1 << 7); 261 } else { 262 ptr = ptr + i; 263 operand = (1 << (remainder - 1)); 264 } 265 status = *ptr & operand; 266 if (status) 267 *ptr = *ptr & ~(operand); 268 } 269 } 270 271 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) 272 { 273 int i, remainder, status; 274 unsigned char *ptr = buffer; 275 unsigned char operand; 276 277 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 278 i = inode_no / 8; 279 remainder = inode_no % 8; 280 if (remainder == 0) { 281 ptr = ptr + i - 1; 282 operand = (1 << 7); 283 } else { 284 ptr = ptr + i; 285 operand = (1 << (remainder - 1)); 286 } 287 status = *ptr & operand; 288 if (status) 289 return -1; 290 291 *ptr = *ptr | operand; 292 293 return 0; 294 } 295 296 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) 297 { 298 int i, remainder, status; 299 unsigned char *ptr = buffer; 300 unsigned char operand; 301 302 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 303 i = inode_no / 8; 304 remainder = inode_no % 8; 305 if (remainder == 0) { 306 ptr = ptr + i - 1; 307 operand = (1 << 7); 308 } else { 309 ptr = ptr + i; 310 operand = (1 << (remainder - 1)); 311 } 312 status = *ptr & operand; 313 if (status) 314 *ptr = *ptr & ~(operand); 315 } 316 317 uint16_t ext4fs_checksum_update(uint32_t i) 318 { 319 struct ext2_block_group *desc; 320 struct ext_filesystem *fs = get_fs(); 321 uint16_t crc = 0; 322 __le32 le32_i = cpu_to_le32(i); 323 324 desc = (struct ext2_block_group *)&fs->bgd[i]; 325 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { 326 int offset = offsetof(struct ext2_block_group, bg_checksum); 327 328 crc = ext2fs_crc16(~0, fs->sb->unique_id, 329 sizeof(fs->sb->unique_id)); 330 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); 331 crc = ext2fs_crc16(crc, desc, offset); 332 offset += sizeof(desc->bg_checksum); /* skip checksum */ 333 assert(offset == sizeof(*desc)); 334 } 335 336 return crc; 337 } 338 339 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) 340 { 341 int dentry_length; 342 int sizeof_void_space; 343 int new_entry_byte_reqd; 344 short padding_factor = 0; 345 346 if (dir->namelen % 4 != 0) 347 padding_factor = 4 - (dir->namelen % 4); 348 349 dentry_length = sizeof(struct ext2_dirent) + 350 dir->namelen + padding_factor; 351 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; 352 if (sizeof_void_space == 0) 353 return 0; 354 355 padding_factor = 0; 356 if (strlen(filename) % 4 != 0) 357 padding_factor = 4 - (strlen(filename) % 4); 358 359 new_entry_byte_reqd = strlen(filename) + 360 sizeof(struct ext2_dirent) + padding_factor; 361 if (sizeof_void_space >= new_entry_byte_reqd) { 362 dir->direntlen = cpu_to_le16(dentry_length); 363 return sizeof_void_space; 364 } 365 366 return 0; 367 } 368 369 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type) 370 { 371 unsigned int *zero_buffer = NULL; 372 char *root_first_block_buffer = NULL; 373 int direct_blk_idx; 374 long int root_blknr; 375 long int first_block_no_of_root = 0; 376 long int previous_blknr = -1; 377 int totalbytes = 0; 378 short int padding_factor = 0; 379 unsigned int new_entry_byte_reqd; 380 unsigned int last_entry_dirlen; 381 int sizeof_void_space = 0; 382 int templength = 0; 383 int inodeno; 384 int status; 385 struct ext_filesystem *fs = get_fs(); 386 /* directory entry */ 387 struct ext2_dirent *dir; 388 char *temp_dir = NULL; 389 uint32_t new_blk_no; 390 uint32_t new_size; 391 uint32_t new_blockcnt; 392 393 zero_buffer = zalloc(fs->blksz); 394 if (!zero_buffer) { 395 printf("No Memory\n"); 396 return; 397 } 398 root_first_block_buffer = zalloc(fs->blksz); 399 if (!root_first_block_buffer) { 400 free(zero_buffer); 401 printf("No Memory\n"); 402 return; 403 } 404 restart: 405 406 /* read the block no allocated to a file */ 407 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 408 direct_blk_idx++) { 409 root_blknr = read_allocated_block(g_parent_inode, 410 direct_blk_idx); 411 if (root_blknr == 0) { 412 first_block_no_of_root = previous_blknr; 413 break; 414 } 415 previous_blknr = root_blknr; 416 } 417 418 status = ext4fs_devread((lbaint_t)first_block_no_of_root 419 * fs->sect_perblk, 420 0, fs->blksz, root_first_block_buffer); 421 if (status == 0) 422 goto fail; 423 424 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 425 goto fail; 426 dir = (struct ext2_dirent *)root_first_block_buffer; 427 totalbytes = 0; 428 while (le16_to_cpu(dir->direntlen) > 0) { 429 /* 430 * blocksize-totalbytes because last directory length 431 * i.e. dir->direntlen is free availble space in the 432 * block that means it is a last entry of directory 433 * entry 434 */ 435 436 /* traversing the each directory entry */ 437 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { 438 if (strlen(filename) % 4 != 0) 439 padding_factor = 4 - (strlen(filename) % 4); 440 441 new_entry_byte_reqd = strlen(filename) + 442 sizeof(struct ext2_dirent) + padding_factor; 443 padding_factor = 0; 444 /* 445 * update last directory entry length to its 446 * length because we are creating new directory 447 * entry 448 */ 449 if (dir->namelen % 4 != 0) 450 padding_factor = 4 - (dir->namelen % 4); 451 452 last_entry_dirlen = dir->namelen + 453 sizeof(struct ext2_dirent) + padding_factor; 454 if ((fs->blksz - totalbytes - last_entry_dirlen) < 455 new_entry_byte_reqd) { 456 printf("1st Block Full:Allocate new block\n"); 457 458 if (direct_blk_idx == INDIRECT_BLOCKS - 1) { 459 printf("Directory exceeds limit\n"); 460 goto fail; 461 } 462 new_blk_no = ext4fs_get_new_blk_no(); 463 if (new_blk_no == -1) { 464 printf("no block left to assign\n"); 465 goto fail; 466 } 467 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); 468 g_parent_inode->b.blocks.dir_blocks[direct_blk_idx] = 469 cpu_to_le32(new_blk_no); 470 471 new_size = le32_to_cpu(g_parent_inode->size); 472 new_size += fs->blksz; 473 g_parent_inode->size = cpu_to_le32(new_size); 474 475 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); 476 new_blockcnt += fs->sect_perblk; 477 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); 478 479 if (ext4fs_put_metadata 480 (root_first_block_buffer, 481 first_block_no_of_root)) 482 goto fail; 483 goto restart; 484 } 485 dir->direntlen = cpu_to_le16(last_entry_dirlen); 486 break; 487 } 488 489 templength = le16_to_cpu(dir->direntlen); 490 totalbytes = totalbytes + templength; 491 sizeof_void_space = check_void_in_dentry(dir, filename); 492 if (sizeof_void_space) 493 break; 494 495 dir = (struct ext2_dirent *)((char *)dir + templength); 496 } 497 498 /* make a pointer ready for creating next directory entry */ 499 templength = le16_to_cpu(dir->direntlen); 500 totalbytes = totalbytes + templength; 501 dir = (struct ext2_dirent *)((char *)dir + templength); 502 503 /* get the next available inode number */ 504 inodeno = ext4fs_get_new_inode_no(); 505 if (inodeno == -1) { 506 printf("no inode left to assign\n"); 507 goto fail; 508 } 509 dir->inode = cpu_to_le32(inodeno); 510 if (sizeof_void_space) 511 dir->direntlen = cpu_to_le16(sizeof_void_space); 512 else 513 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); 514 515 dir->namelen = strlen(filename); 516 dir->filetype = FILETYPE_REG; /* regular file */ 517 temp_dir = (char *)dir; 518 temp_dir = temp_dir + sizeof(struct ext2_dirent); 519 memcpy(temp_dir, filename, strlen(filename)); 520 521 *p_ino = inodeno; 522 523 /* update or write the 1st block of root inode */ 524 if (ext4fs_put_metadata(root_first_block_buffer, 525 first_block_no_of_root)) 526 goto fail; 527 528 fail: 529 free(zero_buffer); 530 free(root_first_block_buffer); 531 } 532 533 static int search_dir(struct ext2_inode *parent_inode, char *dirname) 534 { 535 int status; 536 int inodeno; 537 int totalbytes; 538 int templength; 539 int direct_blk_idx; 540 long int blknr; 541 int found = 0; 542 char *ptr = NULL; 543 unsigned char *block_buffer = NULL; 544 struct ext2_dirent *dir = NULL; 545 struct ext2_dirent *previous_dir = NULL; 546 struct ext_filesystem *fs = get_fs(); 547 548 /* read the block no allocated to a file */ 549 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 550 direct_blk_idx++) { 551 blknr = read_allocated_block(parent_inode, direct_blk_idx); 552 if (blknr == 0) 553 goto fail; 554 555 /* read the blocks of parenet inode */ 556 block_buffer = zalloc(fs->blksz); 557 if (!block_buffer) 558 goto fail; 559 560 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 561 0, fs->blksz, (char *)block_buffer); 562 if (status == 0) 563 goto fail; 564 565 dir = (struct ext2_dirent *)block_buffer; 566 ptr = (char *)dir; 567 totalbytes = 0; 568 while (le16_to_cpu(dir->direntlen) >= 0) { 569 /* 570 * blocksize-totalbytes because last directory 571 * length i.e.,*dir->direntlen is free availble 572 * space in the block that means 573 * it is a last entry of directory entry 574 */ 575 if (strlen(dirname) == dir->namelen) { 576 if (strncmp(dirname, ptr + sizeof(struct ext2_dirent), dir->namelen) == 0) { 577 uint16_t new_len; 578 new_len = le16_to_cpu(previous_dir->direntlen); 579 new_len += le16_to_cpu(dir->direntlen); 580 previous_dir->direntlen = cpu_to_le16(new_len); 581 inodeno = le32_to_cpu(dir->inode); 582 dir->inode = 0; 583 found = 1; 584 break; 585 } 586 } 587 588 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) 589 break; 590 591 /* traversing the each directory entry */ 592 templength = le16_to_cpu(dir->direntlen); 593 totalbytes = totalbytes + templength; 594 previous_dir = dir; 595 dir = (struct ext2_dirent *)((char *)dir + templength); 596 ptr = (char *)dir; 597 } 598 599 if (found == 1) { 600 free(block_buffer); 601 block_buffer = NULL; 602 return inodeno; 603 } 604 605 free(block_buffer); 606 block_buffer = NULL; 607 } 608 609 fail: 610 free(block_buffer); 611 612 return -1; 613 } 614 615 static int find_dir_depth(char *dirname) 616 { 617 char *token = strtok(dirname, "/"); 618 int count = 0; 619 while (token != NULL) { 620 token = strtok(NULL, "/"); 621 count++; 622 } 623 return count + 1 + 1; 624 /* 625 * for example for string /home/temp 626 * depth=home(1)+temp(1)+1 extra for NULL; 627 * so count is 4; 628 */ 629 } 630 631 static int parse_path(char **arr, char *dirname) 632 { 633 char *token = strtok(dirname, "/"); 634 int i = 0; 635 636 /* add root */ 637 arr[i] = zalloc(strlen("/") + 1); 638 if (!arr[i]) 639 return -ENOMEM; 640 memcpy(arr[i++], "/", strlen("/")); 641 642 /* add each path entry after root */ 643 while (token != NULL) { 644 arr[i] = zalloc(strlen(token) + 1); 645 if (!arr[i]) 646 return -ENOMEM; 647 memcpy(arr[i++], token, strlen(token)); 648 token = strtok(NULL, "/"); 649 } 650 arr[i] = NULL; 651 652 return 0; 653 } 654 655 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 656 { 657 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 658 return -1; 659 660 return 0; 661 } 662 663 /* 664 * Function: ext4fs_get_parent_inode_num 665 * Return Value: inode Number of the parent directory of file/Directory to be 666 * created 667 * dirname : Input parmater, input path name of the file/directory to be created 668 * dname : Output parameter, to be filled with the name of the directory 669 * extracted from dirname 670 */ 671 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 672 { 673 int i; 674 int depth = 0; 675 int matched_inode_no; 676 int result_inode_no = -1; 677 char **ptr = NULL; 678 char *depth_dirname = NULL; 679 char *parse_dirname = NULL; 680 struct ext2_inode *parent_inode = NULL; 681 struct ext2_inode *first_inode = NULL; 682 struct ext2_inode temp_inode; 683 684 if (*dirname != '/') { 685 printf("Please supply Absolute path\n"); 686 return -1; 687 } 688 689 /* TODO: input validation make equivalent to linux */ 690 depth_dirname = zalloc(strlen(dirname) + 1); 691 if (!depth_dirname) 692 return -ENOMEM; 693 694 memcpy(depth_dirname, dirname, strlen(dirname)); 695 depth = find_dir_depth(depth_dirname); 696 parse_dirname = zalloc(strlen(dirname) + 1); 697 if (!parse_dirname) 698 goto fail; 699 memcpy(parse_dirname, dirname, strlen(dirname)); 700 701 /* allocate memory for each directory level */ 702 ptr = zalloc((depth) * sizeof(char *)); 703 if (!ptr) 704 goto fail; 705 if (parse_path(ptr, parse_dirname)) 706 goto fail; 707 parent_inode = zalloc(sizeof(struct ext2_inode)); 708 if (!parent_inode) 709 goto fail; 710 first_inode = zalloc(sizeof(struct ext2_inode)); 711 if (!first_inode) 712 goto fail; 713 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 714 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 715 if (flags & F_FILE) 716 result_inode_no = EXT2_ROOT_INO; 717 for (i = 1; i < depth; i++) { 718 matched_inode_no = search_dir(parent_inode, ptr[i]); 719 if (matched_inode_no == -1) { 720 if (ptr[i + 1] == NULL && i == 1) { 721 result_inode_no = EXT2_ROOT_INO; 722 goto end; 723 } else { 724 if (ptr[i + 1] == NULL) 725 break; 726 printf("Invalid path\n"); 727 result_inode_no = -1; 728 goto fail; 729 } 730 } else { 731 if (ptr[i + 1] != NULL) { 732 memset(parent_inode, '\0', 733 sizeof(struct ext2_inode)); 734 if (ext4fs_iget(matched_inode_no, 735 parent_inode)) { 736 result_inode_no = -1; 737 goto fail; 738 } 739 result_inode_no = matched_inode_no; 740 } else { 741 break; 742 } 743 } 744 } 745 746 end: 747 if (i == 1) 748 matched_inode_no = search_dir(first_inode, ptr[i]); 749 else 750 matched_inode_no = search_dir(parent_inode, ptr[i]); 751 752 if (matched_inode_no != -1) { 753 ext4fs_iget(matched_inode_no, &temp_inode); 754 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { 755 printf("It is a Directory\n"); 756 result_inode_no = -1; 757 goto fail; 758 } 759 } 760 761 if (strlen(ptr[i]) > 256) { 762 result_inode_no = -1; 763 goto fail; 764 } 765 memcpy(dname, ptr[i], strlen(ptr[i])); 766 767 fail: 768 free(depth_dirname); 769 free(parse_dirname); 770 for (i = 0; i < depth; i++) { 771 if (!ptr[i]) 772 break; 773 free(ptr[i]); 774 } 775 free(ptr); 776 free(parent_inode); 777 free(first_inode); 778 779 return result_inode_no; 780 } 781 782 static int check_filename(char *filename, unsigned int blknr) 783 { 784 unsigned int first_block_no_of_root; 785 int totalbytes = 0; 786 int templength = 0; 787 int status, inodeno; 788 int found = 0; 789 char *root_first_block_buffer = NULL; 790 char *root_first_block_addr = NULL; 791 struct ext2_dirent *dir = NULL; 792 struct ext2_dirent *previous_dir = NULL; 793 char *ptr = NULL; 794 struct ext_filesystem *fs = get_fs(); 795 int ret = -1; 796 797 /* get the first block of root */ 798 first_block_no_of_root = blknr; 799 root_first_block_buffer = zalloc(fs->blksz); 800 if (!root_first_block_buffer) 801 return -ENOMEM; 802 root_first_block_addr = root_first_block_buffer; 803 status = ext4fs_devread((lbaint_t)first_block_no_of_root * 804 fs->sect_perblk, 0, 805 fs->blksz, root_first_block_buffer); 806 if (status == 0) 807 goto fail; 808 809 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 810 goto fail; 811 dir = (struct ext2_dirent *)root_first_block_buffer; 812 ptr = (char *)dir; 813 totalbytes = 0; 814 while (le16_to_cpu(dir->direntlen) >= 0) { 815 /* 816 * blocksize-totalbytes because last 817 * directory length i.e., *dir->direntlen 818 * is free availble space in the block that 819 * means it is a last entry of directory entry 820 */ 821 if (strlen(filename) == dir->namelen) { 822 if (strncmp(filename, ptr + sizeof(struct ext2_dirent), 823 dir->namelen) == 0) { 824 uint16_t new_len; 825 printf("file found deleting\n"); 826 new_len = le16_to_cpu(previous_dir->direntlen); 827 new_len += le16_to_cpu(dir->direntlen); 828 previous_dir->direntlen = cpu_to_le16(new_len); 829 inodeno = le32_to_cpu(dir->inode); 830 dir->inode = 0; 831 found = 1; 832 break; 833 } 834 } 835 836 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) 837 break; 838 839 /* traversing the each directory entry */ 840 templength = le16_to_cpu(dir->direntlen); 841 totalbytes = totalbytes + templength; 842 previous_dir = dir; 843 dir = (struct ext2_dirent *)((char *)dir + templength); 844 ptr = (char *)dir; 845 } 846 847 848 if (found == 1) { 849 if (ext4fs_put_metadata(root_first_block_addr, 850 first_block_no_of_root)) 851 goto fail; 852 ret = inodeno; 853 } 854 fail: 855 free(root_first_block_buffer); 856 857 return ret; 858 } 859 860 int ext4fs_filename_check(char *filename) 861 { 862 short direct_blk_idx = 0; 863 long int blknr = -1; 864 int inodeno = -1; 865 866 /* read the block no allocated to a file */ 867 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS; 868 direct_blk_idx++) { 869 blknr = read_allocated_block(g_parent_inode, direct_blk_idx); 870 if (blknr == 0) 871 break; 872 inodeno = check_filename(filename, blknr); 873 if (inodeno != -1) 874 return inodeno; 875 } 876 877 return -1; 878 } 879 880 uint32_t ext4fs_get_new_blk_no(void) 881 { 882 short i; 883 short status; 884 int remainder; 885 unsigned int bg_idx; 886 static int prev_bg_bitmap_index = -1; 887 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 888 struct ext_filesystem *fs = get_fs(); 889 char *journal_buffer = zalloc(fs->blksz); 890 char *zero_buffer = zalloc(fs->blksz); 891 if (!journal_buffer || !zero_buffer) 892 goto fail; 893 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; 894 895 if (fs->first_pass_bbmap == 0) { 896 for (i = 0; i < fs->no_blkgrp; i++) { 897 if (le16_to_cpu(bgd[i].free_blocks)) { 898 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) { 899 uint16_t new_flags; 900 put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz, 901 zero_buffer, fs->blksz); 902 new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; 903 bgd[i].bg_flags = cpu_to_le16(new_flags); 904 memcpy(fs->blk_bmaps[i], zero_buffer, 905 fs->blksz); 906 } 907 fs->curr_blkno = 908 _get_new_blk_no(fs->blk_bmaps[i]); 909 if (fs->curr_blkno == -1) 910 /* if block bitmap is completely fill */ 911 continue; 912 fs->curr_blkno = fs->curr_blkno + 913 (i * fs->blksz * 8); 914 fs->first_pass_bbmap++; 915 ext4fs_bg_free_blocks_dec(&bgd[i]); 916 ext4fs_sb_free_blocks_dec(fs->sb); 917 status = ext4fs_devread( 918 (lbaint_t)le32_to_cpu(bgd[i].block_id) * 919 fs->sect_perblk, 0, 920 fs->blksz, 921 journal_buffer); 922 if (status == 0) 923 goto fail; 924 if (ext4fs_log_journal(journal_buffer, 925 le32_to_cpu(bgd[i].block_id))) 926 goto fail; 927 goto success; 928 } else { 929 debug("no space left on block group %d\n", i); 930 } 931 } 932 933 goto fail; 934 } else { 935 restart: 936 fs->curr_blkno++; 937 /* get the blockbitmap index respective to blockno */ 938 bg_idx = fs->curr_blkno / blk_per_grp; 939 if (fs->blksz == 1024) { 940 remainder = fs->curr_blkno % blk_per_grp; 941 if (!remainder) 942 bg_idx--; 943 } 944 945 /* 946 * To skip completely filled block group bitmaps 947 * Optimize the block allocation 948 */ 949 if (bg_idx >= fs->no_blkgrp) 950 goto fail; 951 952 if (bgd[bg_idx].free_blocks == 0) { 953 debug("block group %u is full. Skipping\n", bg_idx); 954 fs->curr_blkno = fs->curr_blkno + blk_per_grp; 955 fs->curr_blkno--; 956 goto restart; 957 } 958 959 if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) { 960 uint16_t new_flags; 961 memset(zero_buffer, '\0', fs->blksz); 962 put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz, 963 zero_buffer, fs->blksz); 964 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 965 new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT; 966 bgd[bg_idx].bg_flags = cpu_to_le16(new_flags); 967 } 968 969 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 970 bg_idx) != 0) { 971 debug("going for restart for the block no %ld %u\n", 972 fs->curr_blkno, bg_idx); 973 goto restart; 974 } 975 976 /* journal backup */ 977 if (prev_bg_bitmap_index != bg_idx) { 978 memset(journal_buffer, '\0', fs->blksz); 979 status = ext4fs_devread( 980 (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) 981 * fs->sect_perblk, 982 0, fs->blksz, journal_buffer); 983 if (status == 0) 984 goto fail; 985 if (ext4fs_log_journal(journal_buffer, 986 le32_to_cpu(bgd[bg_idx].block_id))) 987 goto fail; 988 989 prev_bg_bitmap_index = bg_idx; 990 } 991 ext4fs_bg_free_blocks_dec(&bgd[bg_idx]); 992 ext4fs_sb_free_blocks_dec(fs->sb); 993 goto success; 994 } 995 success: 996 free(journal_buffer); 997 free(zero_buffer); 998 999 return fs->curr_blkno; 1000 fail: 1001 free(journal_buffer); 1002 free(zero_buffer); 1003 1004 return -1; 1005 } 1006 1007 int ext4fs_get_new_inode_no(void) 1008 { 1009 short i; 1010 short status; 1011 unsigned int ibmap_idx; 1012 static int prev_inode_bitmap_index = -1; 1013 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1014 struct ext_filesystem *fs = get_fs(); 1015 char *journal_buffer = zalloc(fs->blksz); 1016 char *zero_buffer = zalloc(fs->blksz); 1017 if (!journal_buffer || !zero_buffer) 1018 goto fail; 1019 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable; 1020 1021 if (fs->first_pass_ibmap == 0) { 1022 for (i = 0; i < fs->no_blkgrp; i++) { 1023 if (bgd[i].free_inodes) { 1024 if (bgd[i].bg_itable_unused != 1025 bgd[i].free_inodes) 1026 bgd[i].bg_itable_unused = 1027 bgd[i].free_inodes; 1028 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) { 1029 int new_flags; 1030 put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz, 1031 zero_buffer, fs->blksz); 1032 new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT; 1033 bgd[i].bg_flags = cpu_to_le16(new_flags); 1034 memcpy(fs->inode_bmaps[i], 1035 zero_buffer, fs->blksz); 1036 } 1037 fs->curr_inode_no = 1038 _get_new_inode_no(fs->inode_bmaps[i]); 1039 if (fs->curr_inode_no == -1) 1040 /* if block bitmap is completely fill */ 1041 continue; 1042 fs->curr_inode_no = fs->curr_inode_no + 1043 (i * inodes_per_grp); 1044 fs->first_pass_ibmap++; 1045 ext4fs_bg_free_inodes_dec(&bgd[i]); 1046 ext4fs_bg_itable_unused_dec(&bgd[i]); 1047 ext4fs_sb_free_inodes_dec(fs->sb); 1048 status = ext4fs_devread( 1049 (lbaint_t)le32_to_cpu(bgd[i].inode_id) * 1050 fs->sect_perblk, 0, 1051 fs->blksz, 1052 journal_buffer); 1053 if (status == 0) 1054 goto fail; 1055 if (ext4fs_log_journal(journal_buffer, 1056 le32_to_cpu(bgd[i].inode_id))) 1057 goto fail; 1058 goto success; 1059 } else 1060 debug("no inode left on block group %d\n", i); 1061 } 1062 goto fail; 1063 } else { 1064 restart: 1065 fs->curr_inode_no++; 1066 /* get the blockbitmap index respective to blockno */ 1067 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1068 if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) { 1069 int new_flags; 1070 memset(zero_buffer, '\0', fs->blksz); 1071 put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz, 1072 zero_buffer, fs->blksz); 1073 new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT; 1074 bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags); 1075 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1076 fs->blksz); 1077 } 1078 1079 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1080 fs->inode_bmaps[ibmap_idx], 1081 ibmap_idx) != 0) { 1082 debug("going for restart for the block no %d %u\n", 1083 fs->curr_inode_no, ibmap_idx); 1084 goto restart; 1085 } 1086 1087 /* journal backup */ 1088 if (prev_inode_bitmap_index != ibmap_idx) { 1089 memset(journal_buffer, '\0', fs->blksz); 1090 status = ext4fs_devread( 1091 (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) 1092 * fs->sect_perblk, 1093 0, fs->blksz, journal_buffer); 1094 if (status == 0) 1095 goto fail; 1096 if (ext4fs_log_journal(journal_buffer, 1097 le32_to_cpu(bgd[ibmap_idx].inode_id))) 1098 goto fail; 1099 prev_inode_bitmap_index = ibmap_idx; 1100 } 1101 if (bgd[ibmap_idx].bg_itable_unused != 1102 bgd[ibmap_idx].free_inodes) 1103 bgd[ibmap_idx].bg_itable_unused = 1104 bgd[ibmap_idx].free_inodes; 1105 ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]); 1106 ext4fs_bg_itable_unused_dec(&bgd[ibmap_idx]); 1107 ext4fs_sb_free_inodes_dec(fs->sb); 1108 goto success; 1109 } 1110 1111 success: 1112 free(journal_buffer); 1113 free(zero_buffer); 1114 1115 return fs->curr_inode_no; 1116 fail: 1117 free(journal_buffer); 1118 free(zero_buffer); 1119 1120 return -1; 1121 1122 } 1123 1124 1125 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1126 unsigned int *total_remaining_blocks, 1127 unsigned int *no_blks_reqd) 1128 { 1129 short i; 1130 short status; 1131 long int actual_block_no; 1132 long int si_blockno; 1133 /* si :single indirect */ 1134 __le32 *si_buffer = NULL; 1135 __le32 *si_start_addr = NULL; 1136 struct ext_filesystem *fs = get_fs(); 1137 1138 if (*total_remaining_blocks != 0) { 1139 si_buffer = zalloc(fs->blksz); 1140 if (!si_buffer) { 1141 printf("No Memory\n"); 1142 return; 1143 } 1144 si_start_addr = si_buffer; 1145 si_blockno = ext4fs_get_new_blk_no(); 1146 if (si_blockno == -1) { 1147 printf("no block left to assign\n"); 1148 goto fail; 1149 } 1150 (*no_blks_reqd)++; 1151 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1152 1153 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1154 0, fs->blksz, (char *)si_buffer); 1155 memset(si_buffer, '\0', fs->blksz); 1156 if (status == 0) 1157 goto fail; 1158 1159 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1160 actual_block_no = ext4fs_get_new_blk_no(); 1161 if (actual_block_no == -1) { 1162 printf("no block left to assign\n"); 1163 goto fail; 1164 } 1165 *si_buffer = cpu_to_le32(actual_block_no); 1166 debug("SIAB %u: %u\n", *si_buffer, 1167 *total_remaining_blocks); 1168 1169 si_buffer++; 1170 (*total_remaining_blocks)--; 1171 if (*total_remaining_blocks == 0) 1172 break; 1173 } 1174 1175 /* write the block to disk */ 1176 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1177 si_start_addr, fs->blksz); 1178 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1179 } 1180 fail: 1181 free(si_start_addr); 1182 } 1183 1184 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1185 unsigned int *total_remaining_blocks, 1186 unsigned int *no_blks_reqd) 1187 { 1188 short i; 1189 short j; 1190 short status; 1191 long int actual_block_no; 1192 /* di:double indirect */ 1193 long int di_blockno_parent; 1194 long int di_blockno_child; 1195 __le32 *di_parent_buffer = NULL; 1196 __le32 *di_child_buff = NULL; 1197 __le32 *di_block_start_addr = NULL; 1198 __le32 *di_child_buff_start = NULL; 1199 struct ext_filesystem *fs = get_fs(); 1200 1201 if (*total_remaining_blocks != 0) { 1202 /* double indirect parent block connecting to inode */ 1203 di_blockno_parent = ext4fs_get_new_blk_no(); 1204 if (di_blockno_parent == -1) { 1205 printf("no block left to assign\n"); 1206 goto fail; 1207 } 1208 di_parent_buffer = zalloc(fs->blksz); 1209 if (!di_parent_buffer) 1210 goto fail; 1211 1212 di_block_start_addr = di_parent_buffer; 1213 (*no_blks_reqd)++; 1214 debug("DIPB %ld: %u\n", di_blockno_parent, 1215 *total_remaining_blocks); 1216 1217 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1218 fs->sect_perblk, 0, 1219 fs->blksz, (char *)di_parent_buffer); 1220 1221 if (!status) { 1222 printf("%s: Device read error!\n", __func__); 1223 goto fail; 1224 } 1225 memset(di_parent_buffer, '\0', fs->blksz); 1226 1227 /* 1228 * start:for each double indirect parent 1229 * block create one more block 1230 */ 1231 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1232 di_blockno_child = ext4fs_get_new_blk_no(); 1233 if (di_blockno_child == -1) { 1234 printf("no block left to assign\n"); 1235 goto fail; 1236 } 1237 di_child_buff = zalloc(fs->blksz); 1238 if (!di_child_buff) 1239 goto fail; 1240 1241 di_child_buff_start = di_child_buff; 1242 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1243 di_parent_buffer++; 1244 (*no_blks_reqd)++; 1245 debug("DICB %ld: %u\n", di_blockno_child, 1246 *total_remaining_blocks); 1247 1248 status = ext4fs_devread((lbaint_t)di_blockno_child * 1249 fs->sect_perblk, 0, 1250 fs->blksz, 1251 (char *)di_child_buff); 1252 1253 if (!status) { 1254 printf("%s: Device read error!\n", __func__); 1255 goto fail; 1256 } 1257 memset(di_child_buff, '\0', fs->blksz); 1258 /* filling of actual datablocks for each child */ 1259 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1260 actual_block_no = ext4fs_get_new_blk_no(); 1261 if (actual_block_no == -1) { 1262 printf("no block left to assign\n"); 1263 goto fail; 1264 } 1265 *di_child_buff = cpu_to_le32(actual_block_no); 1266 debug("DIAB %ld: %u\n", actual_block_no, 1267 *total_remaining_blocks); 1268 1269 di_child_buff++; 1270 (*total_remaining_blocks)--; 1271 if (*total_remaining_blocks == 0) 1272 break; 1273 } 1274 /* write the block table */ 1275 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1276 di_child_buff_start, fs->blksz); 1277 free(di_child_buff_start); 1278 di_child_buff_start = NULL; 1279 1280 if (*total_remaining_blocks == 0) 1281 break; 1282 } 1283 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1284 di_block_start_addr, fs->blksz); 1285 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1286 } 1287 fail: 1288 free(di_block_start_addr); 1289 } 1290 1291 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1292 unsigned int *total_remaining_blocks, 1293 unsigned int *no_blks_reqd) 1294 { 1295 short i; 1296 short j; 1297 short k; 1298 long int actual_block_no; 1299 /* ti: Triple Indirect */ 1300 long int ti_gp_blockno; 1301 long int ti_parent_blockno; 1302 long int ti_child_blockno; 1303 __le32 *ti_gp_buff = NULL; 1304 __le32 *ti_parent_buff = NULL; 1305 __le32 *ti_child_buff = NULL; 1306 __le32 *ti_gp_buff_start_addr = NULL; 1307 __le32 *ti_pbuff_start_addr = NULL; 1308 __le32 *ti_cbuff_start_addr = NULL; 1309 struct ext_filesystem *fs = get_fs(); 1310 if (*total_remaining_blocks != 0) { 1311 /* triple indirect grand parent block connecting to inode */ 1312 ti_gp_blockno = ext4fs_get_new_blk_no(); 1313 if (ti_gp_blockno == -1) { 1314 printf("no block left to assign\n"); 1315 return; 1316 } 1317 ti_gp_buff = zalloc(fs->blksz); 1318 if (!ti_gp_buff) 1319 return; 1320 1321 ti_gp_buff_start_addr = ti_gp_buff; 1322 (*no_blks_reqd)++; 1323 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1324 *total_remaining_blocks); 1325 1326 /* for each 4 byte grand parent entry create one more block */ 1327 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1328 ti_parent_blockno = ext4fs_get_new_blk_no(); 1329 if (ti_parent_blockno == -1) { 1330 printf("no block left to assign\n"); 1331 goto fail; 1332 } 1333 ti_parent_buff = zalloc(fs->blksz); 1334 if (!ti_parent_buff) 1335 goto fail; 1336 1337 ti_pbuff_start_addr = ti_parent_buff; 1338 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1339 ti_gp_buff++; 1340 (*no_blks_reqd)++; 1341 debug("TIPB %ld: %u\n", ti_parent_blockno, 1342 *total_remaining_blocks); 1343 1344 /* for each 4 byte entry parent create one more block */ 1345 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1346 ti_child_blockno = ext4fs_get_new_blk_no(); 1347 if (ti_child_blockno == -1) { 1348 printf("no block left assign\n"); 1349 goto fail1; 1350 } 1351 ti_child_buff = zalloc(fs->blksz); 1352 if (!ti_child_buff) 1353 goto fail1; 1354 1355 ti_cbuff_start_addr = ti_child_buff; 1356 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1357 ti_parent_buff++; 1358 (*no_blks_reqd)++; 1359 debug("TICB %ld: %u\n", ti_parent_blockno, 1360 *total_remaining_blocks); 1361 1362 /* fill actual datablocks for each child */ 1363 for (k = 0; k < (fs->blksz / sizeof(int)); 1364 k++) { 1365 actual_block_no = 1366 ext4fs_get_new_blk_no(); 1367 if (actual_block_no == -1) { 1368 printf("no block left\n"); 1369 free(ti_cbuff_start_addr); 1370 goto fail1; 1371 } 1372 *ti_child_buff = cpu_to_le32(actual_block_no); 1373 debug("TIAB %ld: %u\n", actual_block_no, 1374 *total_remaining_blocks); 1375 1376 ti_child_buff++; 1377 (*total_remaining_blocks)--; 1378 if (*total_remaining_blocks == 0) 1379 break; 1380 } 1381 /* write the child block */ 1382 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1383 (uint64_t)fs->blksz)), 1384 ti_cbuff_start_addr, fs->blksz); 1385 free(ti_cbuff_start_addr); 1386 1387 if (*total_remaining_blocks == 0) 1388 break; 1389 } 1390 /* write the parent block */ 1391 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1392 ti_pbuff_start_addr, fs->blksz); 1393 free(ti_pbuff_start_addr); 1394 1395 if (*total_remaining_blocks == 0) 1396 break; 1397 } 1398 /* write the grand parent block */ 1399 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1400 ti_gp_buff_start_addr, fs->blksz); 1401 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1402 free(ti_gp_buff_start_addr); 1403 return; 1404 } 1405 fail1: 1406 free(ti_pbuff_start_addr); 1407 fail: 1408 free(ti_gp_buff_start_addr); 1409 } 1410 1411 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1412 unsigned int total_remaining_blocks, 1413 unsigned int *total_no_of_block) 1414 { 1415 short i; 1416 long int direct_blockno; 1417 unsigned int no_blks_reqd = 0; 1418 1419 /* allocation of direct blocks */ 1420 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1421 direct_blockno = ext4fs_get_new_blk_no(); 1422 if (direct_blockno == -1) { 1423 printf("no block left to assign\n"); 1424 return; 1425 } 1426 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1427 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1428 1429 total_remaining_blocks--; 1430 } 1431 1432 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1433 &no_blks_reqd); 1434 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1435 &no_blks_reqd); 1436 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1437 &no_blks_reqd); 1438 *total_no_of_block += no_blks_reqd; 1439 } 1440 1441 #endif 1442 1443 static struct ext4_extent_header *ext4fs_get_extent_block 1444 (struct ext2_data *data, char *buf, 1445 struct ext4_extent_header *ext_block, 1446 uint32_t fileblock, int log2_blksz) 1447 { 1448 struct ext4_extent_idx *index; 1449 unsigned long long block; 1450 int blksz = EXT2_BLOCK_SIZE(data); 1451 int i; 1452 1453 while (1) { 1454 index = (struct ext4_extent_idx *)(ext_block + 1); 1455 1456 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1457 return NULL; 1458 1459 if (ext_block->eh_depth == 0) 1460 return ext_block; 1461 i = -1; 1462 do { 1463 i++; 1464 if (i >= le16_to_cpu(ext_block->eh_entries)) 1465 break; 1466 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1467 1468 if (--i < 0) 1469 return NULL; 1470 1471 block = le16_to_cpu(index[i].ei_leaf_hi); 1472 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1473 1474 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1475 buf)) 1476 ext_block = (struct ext4_extent_header *)buf; 1477 else 1478 return NULL; 1479 } 1480 } 1481 1482 static int ext4fs_blockgroup 1483 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1484 { 1485 long int blkno; 1486 unsigned int blkoff, desc_per_blk; 1487 int log2blksz = get_fs()->dev_desc->log2blksz; 1488 1489 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group); 1490 1491 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1492 group / desc_per_blk; 1493 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group); 1494 1495 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1496 group, blkno, blkoff); 1497 1498 return ext4fs_devread((lbaint_t)blkno << 1499 (LOG2_BLOCK_SIZE(data) - log2blksz), 1500 blkoff, sizeof(struct ext2_block_group), 1501 (char *)blkgrp); 1502 } 1503 1504 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1505 { 1506 struct ext2_block_group blkgrp; 1507 struct ext2_sblock *sblock = &data->sblock; 1508 struct ext_filesystem *fs = get_fs(); 1509 int log2blksz = get_fs()->dev_desc->log2blksz; 1510 int inodes_per_block, status; 1511 long int blkno; 1512 unsigned int blkoff; 1513 1514 /* It is easier to calculate if the first inode is 0. */ 1515 ino--; 1516 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1517 (sblock->inodes_per_group), &blkgrp); 1518 if (status == 0) 1519 return 0; 1520 1521 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1522 blkno = le32_to_cpu(blkgrp.inode_table_id) + 1523 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1524 blkoff = (ino % inodes_per_block) * fs->inodesz; 1525 /* Read the inode. */ 1526 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1527 log2blksz), blkoff, 1528 sizeof(struct ext2_inode), (char *)inode); 1529 if (status == 0) 1530 return 0; 1531 1532 return 1; 1533 } 1534 1535 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1536 { 1537 long int blknr; 1538 int blksz; 1539 int log2_blksz; 1540 int status; 1541 long int rblock; 1542 long int perblock_parent; 1543 long int perblock_child; 1544 unsigned long long start; 1545 /* get the blocksize of the filesystem */ 1546 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1547 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1548 - get_fs()->dev_desc->log2blksz; 1549 1550 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1551 char *buf = zalloc(blksz); 1552 if (!buf) 1553 return -ENOMEM; 1554 struct ext4_extent_header *ext_block; 1555 struct ext4_extent *extent; 1556 int i = -1; 1557 ext_block = 1558 ext4fs_get_extent_block(ext4fs_root, buf, 1559 (struct ext4_extent_header *) 1560 inode->b.blocks.dir_blocks, 1561 fileblock, log2_blksz); 1562 if (!ext_block) { 1563 printf("invalid extent block\n"); 1564 free(buf); 1565 return -EINVAL; 1566 } 1567 1568 extent = (struct ext4_extent *)(ext_block + 1); 1569 1570 do { 1571 i++; 1572 if (i >= le16_to_cpu(ext_block->eh_entries)) 1573 break; 1574 } while (fileblock >= le32_to_cpu(extent[i].ee_block)); 1575 if (--i >= 0) { 1576 fileblock -= le32_to_cpu(extent[i].ee_block); 1577 if (fileblock >= le16_to_cpu(extent[i].ee_len)) { 1578 free(buf); 1579 return 0; 1580 } 1581 1582 start = le16_to_cpu(extent[i].ee_start_hi); 1583 start = (start << 32) + 1584 le32_to_cpu(extent[i].ee_start_lo); 1585 free(buf); 1586 return fileblock + start; 1587 } 1588 1589 printf("Extent Error\n"); 1590 free(buf); 1591 return -1; 1592 } 1593 1594 /* Direct blocks. */ 1595 if (fileblock < INDIRECT_BLOCKS) 1596 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1597 1598 /* Indirect. */ 1599 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1600 if (ext4fs_indir1_block == NULL) { 1601 ext4fs_indir1_block = zalloc(blksz); 1602 if (ext4fs_indir1_block == NULL) { 1603 printf("** SI ext2fs read block (indir 1)" 1604 "malloc failed. **\n"); 1605 return -1; 1606 } 1607 ext4fs_indir1_size = blksz; 1608 ext4fs_indir1_blkno = -1; 1609 } 1610 if (blksz != ext4fs_indir1_size) { 1611 free(ext4fs_indir1_block); 1612 ext4fs_indir1_block = NULL; 1613 ext4fs_indir1_size = 0; 1614 ext4fs_indir1_blkno = -1; 1615 ext4fs_indir1_block = zalloc(blksz); 1616 if (ext4fs_indir1_block == NULL) { 1617 printf("** SI ext2fs read block (indir 1):" 1618 "malloc failed. **\n"); 1619 return -1; 1620 } 1621 ext4fs_indir1_size = blksz; 1622 } 1623 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1624 log2_blksz) != ext4fs_indir1_blkno) { 1625 status = 1626 ext4fs_devread((lbaint_t)le32_to_cpu 1627 (inode->b.blocks. 1628 indir_block) << log2_blksz, 0, 1629 blksz, (char *)ext4fs_indir1_block); 1630 if (status == 0) { 1631 printf("** SI ext2fs read block (indir 1)" 1632 "failed. **\n"); 1633 return 0; 1634 } 1635 ext4fs_indir1_blkno = 1636 le32_to_cpu(inode->b.blocks. 1637 indir_block) << log2_blksz; 1638 } 1639 blknr = le32_to_cpu(ext4fs_indir1_block 1640 [fileblock - INDIRECT_BLOCKS]); 1641 } 1642 /* Double indirect. */ 1643 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1644 (blksz / 4 + 1)))) { 1645 1646 long int perblock = blksz / 4; 1647 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1648 1649 if (ext4fs_indir1_block == NULL) { 1650 ext4fs_indir1_block = zalloc(blksz); 1651 if (ext4fs_indir1_block == NULL) { 1652 printf("** DI ext2fs read block (indir 2 1)" 1653 "malloc failed. **\n"); 1654 return -1; 1655 } 1656 ext4fs_indir1_size = blksz; 1657 ext4fs_indir1_blkno = -1; 1658 } 1659 if (blksz != ext4fs_indir1_size) { 1660 free(ext4fs_indir1_block); 1661 ext4fs_indir1_block = NULL; 1662 ext4fs_indir1_size = 0; 1663 ext4fs_indir1_blkno = -1; 1664 ext4fs_indir1_block = zalloc(blksz); 1665 if (ext4fs_indir1_block == NULL) { 1666 printf("** DI ext2fs read block (indir 2 1)" 1667 "malloc failed. **\n"); 1668 return -1; 1669 } 1670 ext4fs_indir1_size = blksz; 1671 } 1672 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1673 log2_blksz) != ext4fs_indir1_blkno) { 1674 status = 1675 ext4fs_devread((lbaint_t)le32_to_cpu 1676 (inode->b.blocks. 1677 double_indir_block) << log2_blksz, 1678 0, blksz, 1679 (char *)ext4fs_indir1_block); 1680 if (status == 0) { 1681 printf("** DI ext2fs read block (indir 2 1)" 1682 "failed. **\n"); 1683 return -1; 1684 } 1685 ext4fs_indir1_blkno = 1686 le32_to_cpu(inode->b.blocks.double_indir_block) << 1687 log2_blksz; 1688 } 1689 1690 if (ext4fs_indir2_block == NULL) { 1691 ext4fs_indir2_block = zalloc(blksz); 1692 if (ext4fs_indir2_block == NULL) { 1693 printf("** DI ext2fs read block (indir 2 2)" 1694 "malloc failed. **\n"); 1695 return -1; 1696 } 1697 ext4fs_indir2_size = blksz; 1698 ext4fs_indir2_blkno = -1; 1699 } 1700 if (blksz != ext4fs_indir2_size) { 1701 free(ext4fs_indir2_block); 1702 ext4fs_indir2_block = NULL; 1703 ext4fs_indir2_size = 0; 1704 ext4fs_indir2_blkno = -1; 1705 ext4fs_indir2_block = zalloc(blksz); 1706 if (ext4fs_indir2_block == NULL) { 1707 printf("** DI ext2fs read block (indir 2 2)" 1708 "malloc failed. **\n"); 1709 return -1; 1710 } 1711 ext4fs_indir2_size = blksz; 1712 } 1713 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1714 log2_blksz) != ext4fs_indir2_blkno) { 1715 status = ext4fs_devread((lbaint_t)le32_to_cpu 1716 (ext4fs_indir1_block 1717 [rblock / 1718 perblock]) << log2_blksz, 0, 1719 blksz, 1720 (char *)ext4fs_indir2_block); 1721 if (status == 0) { 1722 printf("** DI ext2fs read block (indir 2 2)" 1723 "failed. **\n"); 1724 return -1; 1725 } 1726 ext4fs_indir2_blkno = 1727 le32_to_cpu(ext4fs_indir1_block[rblock 1728 / 1729 perblock]) << 1730 log2_blksz; 1731 } 1732 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1733 } 1734 /* Tripple indirect. */ 1735 else { 1736 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1737 (blksz / 4 * blksz / 4)); 1738 perblock_child = blksz / 4; 1739 perblock_parent = ((blksz / 4) * (blksz / 4)); 1740 1741 if (ext4fs_indir1_block == NULL) { 1742 ext4fs_indir1_block = zalloc(blksz); 1743 if (ext4fs_indir1_block == NULL) { 1744 printf("** TI ext2fs read block (indir 2 1)" 1745 "malloc failed. **\n"); 1746 return -1; 1747 } 1748 ext4fs_indir1_size = blksz; 1749 ext4fs_indir1_blkno = -1; 1750 } 1751 if (blksz != ext4fs_indir1_size) { 1752 free(ext4fs_indir1_block); 1753 ext4fs_indir1_block = NULL; 1754 ext4fs_indir1_size = 0; 1755 ext4fs_indir1_blkno = -1; 1756 ext4fs_indir1_block = zalloc(blksz); 1757 if (ext4fs_indir1_block == NULL) { 1758 printf("** TI ext2fs read block (indir 2 1)" 1759 "malloc failed. **\n"); 1760 return -1; 1761 } 1762 ext4fs_indir1_size = blksz; 1763 } 1764 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1765 log2_blksz) != ext4fs_indir1_blkno) { 1766 status = ext4fs_devread 1767 ((lbaint_t) 1768 le32_to_cpu(inode->b.blocks.triple_indir_block) 1769 << log2_blksz, 0, blksz, 1770 (char *)ext4fs_indir1_block); 1771 if (status == 0) { 1772 printf("** TI ext2fs read block (indir 2 1)" 1773 "failed. **\n"); 1774 return -1; 1775 } 1776 ext4fs_indir1_blkno = 1777 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1778 log2_blksz; 1779 } 1780 1781 if (ext4fs_indir2_block == NULL) { 1782 ext4fs_indir2_block = zalloc(blksz); 1783 if (ext4fs_indir2_block == NULL) { 1784 printf("** TI ext2fs read block (indir 2 2)" 1785 "malloc failed. **\n"); 1786 return -1; 1787 } 1788 ext4fs_indir2_size = blksz; 1789 ext4fs_indir2_blkno = -1; 1790 } 1791 if (blksz != ext4fs_indir2_size) { 1792 free(ext4fs_indir2_block); 1793 ext4fs_indir2_block = NULL; 1794 ext4fs_indir2_size = 0; 1795 ext4fs_indir2_blkno = -1; 1796 ext4fs_indir2_block = zalloc(blksz); 1797 if (ext4fs_indir2_block == NULL) { 1798 printf("** TI ext2fs read block (indir 2 2)" 1799 "malloc failed. **\n"); 1800 return -1; 1801 } 1802 ext4fs_indir2_size = blksz; 1803 } 1804 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1805 perblock_parent]) << 1806 log2_blksz) 1807 != ext4fs_indir2_blkno) { 1808 status = ext4fs_devread((lbaint_t)le32_to_cpu 1809 (ext4fs_indir1_block 1810 [rblock / 1811 perblock_parent]) << 1812 log2_blksz, 0, blksz, 1813 (char *)ext4fs_indir2_block); 1814 if (status == 0) { 1815 printf("** TI ext2fs read block (indir 2 2)" 1816 "failed. **\n"); 1817 return -1; 1818 } 1819 ext4fs_indir2_blkno = 1820 le32_to_cpu(ext4fs_indir1_block[rblock / 1821 perblock_parent]) 1822 << log2_blksz; 1823 } 1824 1825 if (ext4fs_indir3_block == NULL) { 1826 ext4fs_indir3_block = zalloc(blksz); 1827 if (ext4fs_indir3_block == NULL) { 1828 printf("** TI ext2fs read block (indir 2 2)" 1829 "malloc failed. **\n"); 1830 return -1; 1831 } 1832 ext4fs_indir3_size = blksz; 1833 ext4fs_indir3_blkno = -1; 1834 } 1835 if (blksz != ext4fs_indir3_size) { 1836 free(ext4fs_indir3_block); 1837 ext4fs_indir3_block = NULL; 1838 ext4fs_indir3_size = 0; 1839 ext4fs_indir3_blkno = -1; 1840 ext4fs_indir3_block = zalloc(blksz); 1841 if (ext4fs_indir3_block == NULL) { 1842 printf("** TI ext2fs read block (indir 2 2)" 1843 "malloc failed. **\n"); 1844 return -1; 1845 } 1846 ext4fs_indir3_size = blksz; 1847 } 1848 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1849 / 1850 perblock_child]) << 1851 log2_blksz) != ext4fs_indir3_blkno) { 1852 status = 1853 ext4fs_devread((lbaint_t)le32_to_cpu 1854 (ext4fs_indir2_block 1855 [(rblock / perblock_child) 1856 % (blksz / 4)]) << log2_blksz, 0, 1857 blksz, (char *)ext4fs_indir3_block); 1858 if (status == 0) { 1859 printf("** TI ext2fs read block (indir 2 2)" 1860 "failed. **\n"); 1861 return -1; 1862 } 1863 ext4fs_indir3_blkno = 1864 le32_to_cpu(ext4fs_indir2_block[(rblock / 1865 perblock_child) % 1866 (blksz / 1867 4)]) << 1868 log2_blksz; 1869 } 1870 1871 blknr = le32_to_cpu(ext4fs_indir3_block 1872 [rblock % perblock_child]); 1873 } 1874 debug("read_allocated_block %ld\n", blknr); 1875 1876 return blknr; 1877 } 1878 1879 /** 1880 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1881 * global pointers 1882 * 1883 * This function assures that for a file with the same name but different size 1884 * the sequential store on the ext4 filesystem will be correct. 1885 * 1886 * In this function the global data, responsible for internal representation 1887 * of the ext4 data are initialized to the reset state. Without this, during 1888 * replacement of the smaller file with the bigger truncation of new file was 1889 * performed. 1890 */ 1891 void ext4fs_reinit_global(void) 1892 { 1893 if (ext4fs_indir1_block != NULL) { 1894 free(ext4fs_indir1_block); 1895 ext4fs_indir1_block = NULL; 1896 ext4fs_indir1_size = 0; 1897 ext4fs_indir1_blkno = -1; 1898 } 1899 if (ext4fs_indir2_block != NULL) { 1900 free(ext4fs_indir2_block); 1901 ext4fs_indir2_block = NULL; 1902 ext4fs_indir2_size = 0; 1903 ext4fs_indir2_blkno = -1; 1904 } 1905 if (ext4fs_indir3_block != NULL) { 1906 free(ext4fs_indir3_block); 1907 ext4fs_indir3_block = NULL; 1908 ext4fs_indir3_size = 0; 1909 ext4fs_indir3_blkno = -1; 1910 } 1911 } 1912 void ext4fs_close(void) 1913 { 1914 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1915 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1916 ext4fs_file = NULL; 1917 } 1918 if (ext4fs_root != NULL) { 1919 free(ext4fs_root); 1920 ext4fs_root = NULL; 1921 } 1922 1923 ext4fs_reinit_global(); 1924 } 1925 1926 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 1927 struct ext2fs_node **fnode, int *ftype) 1928 { 1929 unsigned int fpos = 0; 1930 int status; 1931 loff_t actread; 1932 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 1933 1934 #ifdef DEBUG 1935 if (name != NULL) 1936 printf("Iterate dir %s\n", name); 1937 #endif /* of DEBUG */ 1938 if (!diro->inode_read) { 1939 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 1940 if (status == 0) 1941 return 0; 1942 } 1943 /* Search the file. */ 1944 while (fpos < le32_to_cpu(diro->inode.size)) { 1945 struct ext2_dirent dirent; 1946 1947 status = ext4fs_read_file(diro, fpos, 1948 sizeof(struct ext2_dirent), 1949 (char *)&dirent, &actread); 1950 if (status < 0) 1951 return 0; 1952 1953 if (dirent.direntlen == 0) { 1954 printf("Failed to iterate over directory %s\n", name); 1955 return 0; 1956 } 1957 1958 if (dirent.namelen != 0) { 1959 char filename[dirent.namelen + 1]; 1960 struct ext2fs_node *fdiro; 1961 int type = FILETYPE_UNKNOWN; 1962 1963 status = ext4fs_read_file(diro, 1964 fpos + 1965 sizeof(struct ext2_dirent), 1966 dirent.namelen, filename, 1967 &actread); 1968 if (status < 0) 1969 return 0; 1970 1971 fdiro = zalloc(sizeof(struct ext2fs_node)); 1972 if (!fdiro) 1973 return 0; 1974 1975 fdiro->data = diro->data; 1976 fdiro->ino = le32_to_cpu(dirent.inode); 1977 1978 filename[dirent.namelen] = '\0'; 1979 1980 if (dirent.filetype != FILETYPE_UNKNOWN) { 1981 fdiro->inode_read = 0; 1982 1983 if (dirent.filetype == FILETYPE_DIRECTORY) 1984 type = FILETYPE_DIRECTORY; 1985 else if (dirent.filetype == FILETYPE_SYMLINK) 1986 type = FILETYPE_SYMLINK; 1987 else if (dirent.filetype == FILETYPE_REG) 1988 type = FILETYPE_REG; 1989 } else { 1990 status = ext4fs_read_inode(diro->data, 1991 le32_to_cpu 1992 (dirent.inode), 1993 &fdiro->inode); 1994 if (status == 0) { 1995 free(fdiro); 1996 return 0; 1997 } 1998 fdiro->inode_read = 1; 1999 2000 if ((le16_to_cpu(fdiro->inode.mode) & 2001 FILETYPE_INO_MASK) == 2002 FILETYPE_INO_DIRECTORY) { 2003 type = FILETYPE_DIRECTORY; 2004 } else if ((le16_to_cpu(fdiro->inode.mode) 2005 & FILETYPE_INO_MASK) == 2006 FILETYPE_INO_SYMLINK) { 2007 type = FILETYPE_SYMLINK; 2008 } else if ((le16_to_cpu(fdiro->inode.mode) 2009 & FILETYPE_INO_MASK) == 2010 FILETYPE_INO_REG) { 2011 type = FILETYPE_REG; 2012 } 2013 } 2014 #ifdef DEBUG 2015 printf("iterate >%s<\n", filename); 2016 #endif /* of DEBUG */ 2017 if ((name != NULL) && (fnode != NULL) 2018 && (ftype != NULL)) { 2019 if (strcmp(filename, name) == 0) { 2020 *ftype = type; 2021 *fnode = fdiro; 2022 return 1; 2023 } 2024 } else { 2025 if (fdiro->inode_read == 0) { 2026 status = ext4fs_read_inode(diro->data, 2027 le32_to_cpu( 2028 dirent.inode), 2029 &fdiro->inode); 2030 if (status == 0) { 2031 free(fdiro); 2032 return 0; 2033 } 2034 fdiro->inode_read = 1; 2035 } 2036 switch (type) { 2037 case FILETYPE_DIRECTORY: 2038 printf("<DIR> "); 2039 break; 2040 case FILETYPE_SYMLINK: 2041 printf("<SYM> "); 2042 break; 2043 case FILETYPE_REG: 2044 printf(" "); 2045 break; 2046 default: 2047 printf("< ? > "); 2048 break; 2049 } 2050 printf("%10u %s\n", 2051 le32_to_cpu(fdiro->inode.size), 2052 filename); 2053 } 2054 free(fdiro); 2055 } 2056 fpos += le16_to_cpu(dirent.direntlen); 2057 } 2058 return 0; 2059 } 2060 2061 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2062 { 2063 char *symlink; 2064 struct ext2fs_node *diro = node; 2065 int status; 2066 loff_t actread; 2067 2068 if (!diro->inode_read) { 2069 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2070 if (status == 0) 2071 return NULL; 2072 } 2073 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2074 if (!symlink) 2075 return NULL; 2076 2077 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2078 strncpy(symlink, diro->inode.b.symlink, 2079 le32_to_cpu(diro->inode.size)); 2080 } else { 2081 status = ext4fs_read_file(diro, 0, 2082 le32_to_cpu(diro->inode.size), 2083 symlink, &actread); 2084 if ((status < 0) || (actread == 0)) { 2085 free(symlink); 2086 return NULL; 2087 } 2088 } 2089 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2090 return symlink; 2091 } 2092 2093 static int ext4fs_find_file1(const char *currpath, 2094 struct ext2fs_node *currroot, 2095 struct ext2fs_node **currfound, int *foundtype) 2096 { 2097 char fpath[strlen(currpath) + 1]; 2098 char *name = fpath; 2099 char *next; 2100 int status; 2101 int type = FILETYPE_DIRECTORY; 2102 struct ext2fs_node *currnode = currroot; 2103 struct ext2fs_node *oldnode = currroot; 2104 2105 strncpy(fpath, currpath, strlen(currpath) + 1); 2106 2107 /* Remove all leading slashes. */ 2108 while (*name == '/') 2109 name++; 2110 2111 if (!*name) { 2112 *currfound = currnode; 2113 return 1; 2114 } 2115 2116 for (;;) { 2117 int found; 2118 2119 /* Extract the actual part from the pathname. */ 2120 next = strchr(name, '/'); 2121 if (next) { 2122 /* Remove all leading slashes. */ 2123 while (*next == '/') 2124 *(next++) = '\0'; 2125 } 2126 2127 if (type != FILETYPE_DIRECTORY) { 2128 ext4fs_free_node(currnode, currroot); 2129 return 0; 2130 } 2131 2132 oldnode = currnode; 2133 2134 /* Iterate over the directory. */ 2135 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2136 if (found == 0) 2137 return 0; 2138 2139 if (found == -1) 2140 break; 2141 2142 /* Read in the symlink and follow it. */ 2143 if (type == FILETYPE_SYMLINK) { 2144 char *symlink; 2145 2146 /* Test if the symlink does not loop. */ 2147 if (++symlinknest == 8) { 2148 ext4fs_free_node(currnode, currroot); 2149 ext4fs_free_node(oldnode, currroot); 2150 return 0; 2151 } 2152 2153 symlink = ext4fs_read_symlink(currnode); 2154 ext4fs_free_node(currnode, currroot); 2155 2156 if (!symlink) { 2157 ext4fs_free_node(oldnode, currroot); 2158 return 0; 2159 } 2160 2161 debug("Got symlink >%s<\n", symlink); 2162 2163 if (symlink[0] == '/') { 2164 ext4fs_free_node(oldnode, currroot); 2165 oldnode = &ext4fs_root->diropen; 2166 } 2167 2168 /* Lookup the node the symlink points to. */ 2169 status = ext4fs_find_file1(symlink, oldnode, 2170 &currnode, &type); 2171 2172 free(symlink); 2173 2174 if (status == 0) { 2175 ext4fs_free_node(oldnode, currroot); 2176 return 0; 2177 } 2178 } 2179 2180 ext4fs_free_node(oldnode, currroot); 2181 2182 /* Found the node! */ 2183 if (!next || *next == '\0') { 2184 *currfound = currnode; 2185 *foundtype = type; 2186 return 1; 2187 } 2188 name = next; 2189 } 2190 return -1; 2191 } 2192 2193 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2194 struct ext2fs_node **foundnode, int expecttype) 2195 { 2196 int status; 2197 int foundtype = FILETYPE_DIRECTORY; 2198 2199 symlinknest = 0; 2200 if (!path) 2201 return 0; 2202 2203 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2204 if (status == 0) 2205 return 0; 2206 2207 /* Check if the node that was found was of the expected type. */ 2208 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2209 return 0; 2210 else if ((expecttype == FILETYPE_DIRECTORY) 2211 && (foundtype != expecttype)) 2212 return 0; 2213 2214 return 1; 2215 } 2216 2217 int ext4fs_open(const char *filename, loff_t *len) 2218 { 2219 struct ext2fs_node *fdiro = NULL; 2220 int status; 2221 2222 if (ext4fs_root == NULL) 2223 return -1; 2224 2225 ext4fs_file = NULL; 2226 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2227 FILETYPE_REG); 2228 if (status == 0) 2229 goto fail; 2230 2231 if (!fdiro->inode_read) { 2232 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2233 &fdiro->inode); 2234 if (status == 0) 2235 goto fail; 2236 } 2237 *len = le32_to_cpu(fdiro->inode.size); 2238 ext4fs_file = fdiro; 2239 2240 return 0; 2241 fail: 2242 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2243 2244 return -1; 2245 } 2246 2247 int ext4fs_mount(unsigned part_length) 2248 { 2249 struct ext2_data *data; 2250 int status; 2251 struct ext_filesystem *fs = get_fs(); 2252 data = zalloc(SUPERBLOCK_SIZE); 2253 if (!data) 2254 return 0; 2255 2256 /* Read the superblock. */ 2257 status = ext4_read_superblock((char *)&data->sblock); 2258 2259 if (status == 0) 2260 goto fail; 2261 2262 /* Make sure this is an ext2 filesystem. */ 2263 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2264 goto fail; 2265 2266 /* 2267 * The 64bit feature was enabled when metadata_csum was enabled 2268 * and we do not support metadata_csum (and cannot reliably find 2269 * files when it is set. Refuse to mount. 2270 */ 2271 if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) { 2272 printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n"); 2273 goto fail; 2274 } 2275 2276 if (le32_to_cpu(data->sblock.revision_level == 0)) 2277 fs->inodesz = 128; 2278 else 2279 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2280 2281 debug("EXT2 rev %d, inode_size %d\n", 2282 le32_to_cpu(data->sblock.revision_level), fs->inodesz); 2283 2284 data->diropen.data = data; 2285 data->diropen.ino = 2; 2286 data->diropen.inode_read = 1; 2287 data->inode = &data->diropen.inode; 2288 2289 status = ext4fs_read_inode(data, 2, data->inode); 2290 if (status == 0) 2291 goto fail; 2292 2293 ext4fs_root = data; 2294 2295 return 1; 2296 fail: 2297 printf("Failed to mount ext2 filesystem...\n"); 2298 free(data); 2299 ext4fs_root = NULL; 2300 2301 return 0; 2302 } 2303