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 struct ext2_block_group *ext4fs_get_group_descriptor 51 (const struct ext_filesystem *fs, uint32_t bg_idx) 52 { 53 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize)); 54 } 55 56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb) 57 { 58 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1); 59 } 60 61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb) 62 { 63 uint64_t free_blocks = le32_to_cpu(sb->free_blocks); 64 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; 65 free_blocks--; 66 67 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); 68 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); 69 } 70 71 static inline void ext4fs_bg_free_inodes_dec 72 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 73 { 74 uint32_t free_inodes = le16_to_cpu(bg->free_inodes); 75 if (fs->gdsize == 64) 76 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16; 77 free_inodes--; 78 79 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff); 80 if (fs->gdsize == 64) 81 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16); 82 } 83 84 static inline void ext4fs_bg_free_blocks_dec 85 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 86 { 87 uint32_t free_blocks = le16_to_cpu(bg->free_blocks); 88 if (fs->gdsize == 64) 89 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16; 90 free_blocks--; 91 92 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff); 93 if (fs->gdsize == 64) 94 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16); 95 } 96 97 static inline void ext4fs_bg_itable_unused_dec 98 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 99 { 100 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused); 101 if (fs->gdsize == 64) 102 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16; 103 free_inodes--; 104 105 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff); 106 if (fs->gdsize == 64) 107 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16); 108 } 109 110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb) 111 { 112 uint64_t free_blocks = le32_to_cpu(sb->free_blocks); 113 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; 114 return free_blocks; 115 } 116 117 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks) 118 { 119 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); 120 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); 121 } 122 123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg, 124 const struct ext_filesystem *fs) 125 { 126 uint32_t free_blocks = le16_to_cpu(bg->free_blocks); 127 if (fs->gdsize == 64) 128 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16; 129 return free_blocks; 130 } 131 132 static inline 133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg, 134 const struct ext_filesystem *fs) 135 { 136 uint32_t free_inodes = le16_to_cpu(bg->free_inodes); 137 if (fs->gdsize == 64) 138 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16; 139 return free_inodes; 140 } 141 142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg) 143 { 144 return le16_to_cpu(bg->bg_flags); 145 } 146 147 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg, 148 uint16_t flags) 149 { 150 bg->bg_flags = cpu_to_le16(flags); 151 } 152 153 /* Block number of the block bitmap */ 154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg, 155 const struct ext_filesystem *fs) 156 { 157 uint64_t block_nr = le32_to_cpu(bg->block_id); 158 if (fs->gdsize == 64) 159 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32; 160 return block_nr; 161 } 162 163 /* Block number of the inode bitmap */ 164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg, 165 const struct ext_filesystem *fs) 166 { 167 uint64_t block_nr = le32_to_cpu(bg->inode_id); 168 if (fs->gdsize == 64) 169 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32; 170 return block_nr; 171 } 172 #endif 173 174 /* Block number of the inode table */ 175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg, 176 const struct ext_filesystem *fs) 177 { 178 uint64_t block_nr = le32_to_cpu(bg->inode_table_id); 179 if (fs->gdsize == 64) 180 block_nr += 181 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32; 182 return block_nr; 183 } 184 185 #if defined(CONFIG_EXT4_WRITE) 186 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) 187 { 188 uint32_t res = size / n; 189 if (res * n != size) 190 res++; 191 192 return res; 193 } 194 195 void put_ext4(uint64_t off, void *buf, uint32_t size) 196 { 197 uint64_t startblock; 198 uint64_t remainder; 199 unsigned char *temp_ptr = NULL; 200 struct ext_filesystem *fs = get_fs(); 201 int log2blksz = fs->dev_desc->log2blksz; 202 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); 203 204 startblock = off >> log2blksz; 205 startblock += part_offset; 206 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); 207 208 if (fs->dev_desc == NULL) 209 return; 210 211 if ((startblock + (size >> log2blksz)) > 212 (part_offset + fs->total_sect)) { 213 printf("part_offset is " LBAFU "\n", part_offset); 214 printf("total_sector is %" PRIu64 "\n", fs->total_sect); 215 printf("error: overflow occurs\n"); 216 return; 217 } 218 219 if (remainder) { 220 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 221 temp_ptr = sec_buf; 222 memcpy((temp_ptr + remainder), (unsigned char *)buf, size); 223 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf); 224 } else { 225 if (size >> log2blksz != 0) { 226 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, 227 (unsigned long *)buf); 228 } else { 229 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 230 temp_ptr = sec_buf; 231 memcpy(temp_ptr, buf, size); 232 blk_dwrite(fs->dev_desc, startblock, 1, 233 (unsigned long *)sec_buf); 234 } 235 } 236 } 237 238 static int _get_new_inode_no(unsigned char *buffer) 239 { 240 struct ext_filesystem *fs = get_fs(); 241 unsigned char input; 242 int operand, status; 243 int count = 1; 244 int j = 0; 245 246 /* get the blocksize of the filesystem */ 247 unsigned char *ptr = buffer; 248 while (*ptr == 255) { 249 ptr++; 250 count += 8; 251 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) 252 return -1; 253 } 254 255 for (j = 0; j < fs->blksz; j++) { 256 input = *ptr; 257 int i = 0; 258 while (i <= 7) { 259 operand = 1 << i; 260 status = input & operand; 261 if (status) { 262 i++; 263 count++; 264 } else { 265 *ptr |= operand; 266 return count; 267 } 268 } 269 ptr = ptr + 1; 270 } 271 272 return -1; 273 } 274 275 static int _get_new_blk_no(unsigned char *buffer) 276 { 277 int operand; 278 int count = 0; 279 int i; 280 unsigned char *ptr = buffer; 281 struct ext_filesystem *fs = get_fs(); 282 283 while (*ptr == 255) { 284 ptr++; 285 count += 8; 286 if (count == (fs->blksz * 8)) 287 return -1; 288 } 289 290 if (fs->blksz == 1024) 291 count += 1; 292 293 for (i = 0; i <= 7; i++) { 294 operand = 1 << i; 295 if (*ptr & operand) { 296 count++; 297 } else { 298 *ptr |= operand; 299 return count; 300 } 301 } 302 303 return -1; 304 } 305 306 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) 307 { 308 int i, remainder, status; 309 unsigned char *ptr = buffer; 310 unsigned char operand; 311 i = blockno / 8; 312 remainder = blockno % 8; 313 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 314 315 i = i - (index * blocksize); 316 if (blocksize != 1024) { 317 ptr = ptr + i; 318 operand = 1 << remainder; 319 status = *ptr & operand; 320 if (status) 321 return -1; 322 323 *ptr = *ptr | operand; 324 return 0; 325 } else { 326 if (remainder == 0) { 327 ptr = ptr + i - 1; 328 operand = (1 << 7); 329 } else { 330 ptr = ptr + i; 331 operand = (1 << (remainder - 1)); 332 } 333 status = *ptr & operand; 334 if (status) 335 return -1; 336 337 *ptr = *ptr | operand; 338 return 0; 339 } 340 } 341 342 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) 343 { 344 int i, remainder, status; 345 unsigned char *ptr = buffer; 346 unsigned char operand; 347 i = blockno / 8; 348 remainder = blockno % 8; 349 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 350 351 i = i - (index * blocksize); 352 if (blocksize != 1024) { 353 ptr = ptr + i; 354 operand = (1 << remainder); 355 status = *ptr & operand; 356 if (status) 357 *ptr = *ptr & ~(operand); 358 } else { 359 if (remainder == 0) { 360 ptr = ptr + i - 1; 361 operand = (1 << 7); 362 } else { 363 ptr = ptr + i; 364 operand = (1 << (remainder - 1)); 365 } 366 status = *ptr & operand; 367 if (status) 368 *ptr = *ptr & ~(operand); 369 } 370 } 371 372 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) 373 { 374 int i, remainder, status; 375 unsigned char *ptr = buffer; 376 unsigned char operand; 377 378 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 379 i = inode_no / 8; 380 remainder = inode_no % 8; 381 if (remainder == 0) { 382 ptr = ptr + i - 1; 383 operand = (1 << 7); 384 } else { 385 ptr = ptr + i; 386 operand = (1 << (remainder - 1)); 387 } 388 status = *ptr & operand; 389 if (status) 390 return -1; 391 392 *ptr = *ptr | operand; 393 394 return 0; 395 } 396 397 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) 398 { 399 int i, remainder, status; 400 unsigned char *ptr = buffer; 401 unsigned char operand; 402 403 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 404 i = inode_no / 8; 405 remainder = inode_no % 8; 406 if (remainder == 0) { 407 ptr = ptr + i - 1; 408 operand = (1 << 7); 409 } else { 410 ptr = ptr + i; 411 operand = (1 << (remainder - 1)); 412 } 413 status = *ptr & operand; 414 if (status) 415 *ptr = *ptr & ~(operand); 416 } 417 418 uint16_t ext4fs_checksum_update(uint32_t i) 419 { 420 struct ext2_block_group *desc; 421 struct ext_filesystem *fs = get_fs(); 422 uint16_t crc = 0; 423 __le32 le32_i = cpu_to_le32(i); 424 425 desc = ext4fs_get_group_descriptor(fs, i); 426 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { 427 int offset = offsetof(struct ext2_block_group, bg_checksum); 428 429 crc = ext2fs_crc16(~0, fs->sb->unique_id, 430 sizeof(fs->sb->unique_id)); 431 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); 432 crc = ext2fs_crc16(crc, desc, offset); 433 offset += sizeof(desc->bg_checksum); /* skip checksum */ 434 assert(offset == sizeof(*desc)); 435 } 436 437 return crc; 438 } 439 440 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) 441 { 442 int dentry_length; 443 int sizeof_void_space; 444 int new_entry_byte_reqd; 445 short padding_factor = 0; 446 447 if (dir->namelen % 4 != 0) 448 padding_factor = 4 - (dir->namelen % 4); 449 450 dentry_length = sizeof(struct ext2_dirent) + 451 dir->namelen + padding_factor; 452 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; 453 if (sizeof_void_space == 0) 454 return 0; 455 456 padding_factor = 0; 457 if (strlen(filename) % 4 != 0) 458 padding_factor = 4 - (strlen(filename) % 4); 459 460 new_entry_byte_reqd = strlen(filename) + 461 sizeof(struct ext2_dirent) + padding_factor; 462 if (sizeof_void_space >= new_entry_byte_reqd) { 463 dir->direntlen = cpu_to_le16(dentry_length); 464 return sizeof_void_space; 465 } 466 467 return 0; 468 } 469 470 int ext4fs_update_parent_dentry(char *filename, int file_type) 471 { 472 unsigned int *zero_buffer = NULL; 473 char *root_first_block_buffer = NULL; 474 int blk_idx; 475 long int first_block_no_of_root = 0; 476 int totalbytes = 0; 477 unsigned int new_entry_byte_reqd; 478 int sizeof_void_space = 0; 479 int templength = 0; 480 int inodeno = -1; 481 int status; 482 struct ext_filesystem *fs = get_fs(); 483 /* directory entry */ 484 struct ext2_dirent *dir; 485 char *temp_dir = NULL; 486 uint32_t new_blk_no; 487 uint32_t new_size; 488 uint32_t new_blockcnt; 489 uint32_t directory_blocks; 490 491 zero_buffer = zalloc(fs->blksz); 492 if (!zero_buffer) { 493 printf("No Memory\n"); 494 return -1; 495 } 496 root_first_block_buffer = zalloc(fs->blksz); 497 if (!root_first_block_buffer) { 498 free(zero_buffer); 499 printf("No Memory\n"); 500 return -1; 501 } 502 new_entry_byte_reqd = ROUND(strlen(filename) + 503 sizeof(struct ext2_dirent), 4); 504 restart: 505 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 506 LOG2_BLOCK_SIZE(ext4fs_root); 507 blk_idx = directory_blocks - 1; 508 509 restart_read: 510 /* read the block no allocated to a file */ 511 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx); 512 if (first_block_no_of_root <= 0) 513 goto fail; 514 515 status = ext4fs_devread((lbaint_t)first_block_no_of_root 516 * fs->sect_perblk, 517 0, fs->blksz, root_first_block_buffer); 518 if (status == 0) 519 goto fail; 520 521 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 522 goto fail; 523 dir = (struct ext2_dirent *)root_first_block_buffer; 524 totalbytes = 0; 525 526 while (le16_to_cpu(dir->direntlen) > 0) { 527 unsigned short used_len = ROUND(dir->namelen + 528 sizeof(struct ext2_dirent), 4); 529 530 /* last entry of block */ 531 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { 532 533 /* check if new entry fits */ 534 if ((used_len + new_entry_byte_reqd) <= 535 le16_to_cpu(dir->direntlen)) { 536 dir->direntlen = cpu_to_le16(used_len); 537 break; 538 } else { 539 if (blk_idx > 0) { 540 printf("Block full, trying previous\n"); 541 blk_idx--; 542 goto restart_read; 543 } 544 printf("All blocks full: Allocate new\n"); 545 546 if (le32_to_cpu(g_parent_inode->flags) & 547 EXT4_EXTENTS_FL) { 548 printf("Directory uses extents\n"); 549 goto fail; 550 } 551 if (directory_blocks >= INDIRECT_BLOCKS) { 552 printf("Directory exceeds limit\n"); 553 goto fail; 554 } 555 new_blk_no = ext4fs_get_new_blk_no(); 556 if (new_blk_no == -1) { 557 printf("no block left to assign\n"); 558 goto fail; 559 } 560 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); 561 g_parent_inode->b.blocks. 562 dir_blocks[directory_blocks] = 563 cpu_to_le32(new_blk_no); 564 565 new_size = le32_to_cpu(g_parent_inode->size); 566 new_size += fs->blksz; 567 g_parent_inode->size = cpu_to_le32(new_size); 568 569 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); 570 new_blockcnt += fs->sect_perblk; 571 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); 572 573 if (ext4fs_put_metadata 574 (root_first_block_buffer, 575 first_block_no_of_root)) 576 goto fail; 577 goto restart; 578 } 579 } 580 581 templength = le16_to_cpu(dir->direntlen); 582 totalbytes = totalbytes + templength; 583 sizeof_void_space = check_void_in_dentry(dir, filename); 584 if (sizeof_void_space) 585 break; 586 587 dir = (struct ext2_dirent *)((char *)dir + templength); 588 } 589 590 /* make a pointer ready for creating next directory entry */ 591 templength = le16_to_cpu(dir->direntlen); 592 totalbytes = totalbytes + templength; 593 dir = (struct ext2_dirent *)((char *)dir + templength); 594 595 /* get the next available inode number */ 596 inodeno = ext4fs_get_new_inode_no(); 597 if (inodeno == -1) { 598 printf("no inode left to assign\n"); 599 goto fail; 600 } 601 dir->inode = cpu_to_le32(inodeno); 602 if (sizeof_void_space) 603 dir->direntlen = cpu_to_le16(sizeof_void_space); 604 else 605 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); 606 607 dir->namelen = strlen(filename); 608 dir->filetype = FILETYPE_REG; /* regular file */ 609 temp_dir = (char *)dir; 610 temp_dir = temp_dir + sizeof(struct ext2_dirent); 611 memcpy(temp_dir, filename, strlen(filename)); 612 613 /* update or write the 1st block of root inode */ 614 if (ext4fs_put_metadata(root_first_block_buffer, 615 first_block_no_of_root)) 616 goto fail; 617 618 fail: 619 free(zero_buffer); 620 free(root_first_block_buffer); 621 622 return inodeno; 623 } 624 625 static int search_dir(struct ext2_inode *parent_inode, char *dirname) 626 { 627 int status; 628 int inodeno = 0; 629 int offset; 630 int blk_idx; 631 long int blknr; 632 char *block_buffer = NULL; 633 struct ext2_dirent *dir = NULL; 634 struct ext_filesystem *fs = get_fs(); 635 uint32_t directory_blocks; 636 char *direntname; 637 638 directory_blocks = le32_to_cpu(parent_inode->size) >> 639 LOG2_BLOCK_SIZE(ext4fs_root); 640 641 block_buffer = zalloc(fs->blksz); 642 if (!block_buffer) 643 goto fail; 644 645 /* get the block no allocated to a file */ 646 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 647 blknr = read_allocated_block(parent_inode, blk_idx); 648 if (blknr <= 0) 649 goto fail; 650 651 /* read the directory block */ 652 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 653 0, fs->blksz, (char *)block_buffer); 654 if (status == 0) 655 goto fail; 656 657 offset = 0; 658 do { 659 dir = (struct ext2_dirent *)(block_buffer + offset); 660 direntname = (char*)(dir) + sizeof(struct ext2_dirent); 661 662 int direntlen = le16_to_cpu(dir->direntlen); 663 if (direntlen < sizeof(struct ext2_dirent)) 664 break; 665 666 if (dir->inode && (strlen(dirname) == dir->namelen) && 667 (strncmp(dirname, direntname, dir->namelen) == 0)) { 668 inodeno = le32_to_cpu(dir->inode); 669 break; 670 } 671 672 offset += direntlen; 673 674 } while (offset < fs->blksz); 675 676 if (inodeno > 0) { 677 free(block_buffer); 678 return inodeno; 679 } 680 } 681 682 fail: 683 free(block_buffer); 684 685 return -1; 686 } 687 688 static int find_dir_depth(char *dirname) 689 { 690 char *token = strtok(dirname, "/"); 691 int count = 0; 692 while (token != NULL) { 693 token = strtok(NULL, "/"); 694 count++; 695 } 696 return count + 1 + 1; 697 /* 698 * for example for string /home/temp 699 * depth=home(1)+temp(1)+1 extra for NULL; 700 * so count is 4; 701 */ 702 } 703 704 static int parse_path(char **arr, char *dirname) 705 { 706 char *token = strtok(dirname, "/"); 707 int i = 0; 708 709 /* add root */ 710 arr[i] = zalloc(strlen("/") + 1); 711 if (!arr[i]) 712 return -ENOMEM; 713 memcpy(arr[i++], "/", strlen("/")); 714 715 /* add each path entry after root */ 716 while (token != NULL) { 717 arr[i] = zalloc(strlen(token) + 1); 718 if (!arr[i]) 719 return -ENOMEM; 720 memcpy(arr[i++], token, strlen(token)); 721 token = strtok(NULL, "/"); 722 } 723 arr[i] = NULL; 724 725 return 0; 726 } 727 728 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 729 { 730 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 731 return -1; 732 733 return 0; 734 } 735 736 /* 737 * Function: ext4fs_get_parent_inode_num 738 * Return Value: inode Number of the parent directory of file/Directory to be 739 * created 740 * dirname : Input parmater, input path name of the file/directory to be created 741 * dname : Output parameter, to be filled with the name of the directory 742 * extracted from dirname 743 */ 744 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 745 { 746 int i; 747 int depth = 0; 748 int matched_inode_no; 749 int result_inode_no = -1; 750 char **ptr = NULL; 751 char *depth_dirname = NULL; 752 char *parse_dirname = NULL; 753 struct ext2_inode *parent_inode = NULL; 754 struct ext2_inode *first_inode = NULL; 755 struct ext2_inode temp_inode; 756 757 if (*dirname != '/') { 758 printf("Please supply Absolute path\n"); 759 return -1; 760 } 761 762 /* TODO: input validation make equivalent to linux */ 763 depth_dirname = zalloc(strlen(dirname) + 1); 764 if (!depth_dirname) 765 return -ENOMEM; 766 767 memcpy(depth_dirname, dirname, strlen(dirname)); 768 depth = find_dir_depth(depth_dirname); 769 parse_dirname = zalloc(strlen(dirname) + 1); 770 if (!parse_dirname) 771 goto fail; 772 memcpy(parse_dirname, dirname, strlen(dirname)); 773 774 /* allocate memory for each directory level */ 775 ptr = zalloc((depth) * sizeof(char *)); 776 if (!ptr) 777 goto fail; 778 if (parse_path(ptr, parse_dirname)) 779 goto fail; 780 parent_inode = zalloc(sizeof(struct ext2_inode)); 781 if (!parent_inode) 782 goto fail; 783 first_inode = zalloc(sizeof(struct ext2_inode)); 784 if (!first_inode) 785 goto fail; 786 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 787 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 788 if (flags & F_FILE) 789 result_inode_no = EXT2_ROOT_INO; 790 for (i = 1; i < depth; i++) { 791 matched_inode_no = search_dir(parent_inode, ptr[i]); 792 if (matched_inode_no == -1) { 793 if (ptr[i + 1] == NULL && i == 1) { 794 result_inode_no = EXT2_ROOT_INO; 795 goto end; 796 } else { 797 if (ptr[i + 1] == NULL) 798 break; 799 printf("Invalid path\n"); 800 result_inode_no = -1; 801 goto fail; 802 } 803 } else { 804 if (ptr[i + 1] != NULL) { 805 memset(parent_inode, '\0', 806 sizeof(struct ext2_inode)); 807 if (ext4fs_iget(matched_inode_no, 808 parent_inode)) { 809 result_inode_no = -1; 810 goto fail; 811 } 812 result_inode_no = matched_inode_no; 813 } else { 814 break; 815 } 816 } 817 } 818 819 end: 820 if (i == 1) 821 matched_inode_no = search_dir(first_inode, ptr[i]); 822 else 823 matched_inode_no = search_dir(parent_inode, ptr[i]); 824 825 if (matched_inode_no != -1) { 826 ext4fs_iget(matched_inode_no, &temp_inode); 827 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { 828 printf("It is a Directory\n"); 829 result_inode_no = -1; 830 goto fail; 831 } 832 } 833 834 if (strlen(ptr[i]) > 256) { 835 result_inode_no = -1; 836 goto fail; 837 } 838 memcpy(dname, ptr[i], strlen(ptr[i])); 839 840 fail: 841 free(depth_dirname); 842 free(parse_dirname); 843 for (i = 0; i < depth; i++) { 844 if (!ptr[i]) 845 break; 846 free(ptr[i]); 847 } 848 free(ptr); 849 free(parent_inode); 850 free(first_inode); 851 852 return result_inode_no; 853 } 854 855 static int unlink_filename(char *filename, unsigned int blknr) 856 { 857 int totalbytes = 0; 858 int templength = 0; 859 int status, inodeno; 860 int found = 0; 861 char *root_first_block_buffer = NULL; 862 struct ext2_dirent *dir = NULL; 863 struct ext2_dirent *previous_dir = NULL; 864 char *ptr = NULL; 865 struct ext_filesystem *fs = get_fs(); 866 int ret = -1; 867 868 /* get the first block of root */ 869 root_first_block_buffer = zalloc(fs->blksz); 870 if (!root_first_block_buffer) 871 return -ENOMEM; 872 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 873 fs->blksz, root_first_block_buffer); 874 if (status == 0) 875 goto fail; 876 877 if (ext4fs_log_journal(root_first_block_buffer, blknr)) 878 goto fail; 879 dir = (struct ext2_dirent *)root_first_block_buffer; 880 ptr = (char *)dir; 881 totalbytes = 0; 882 while (le16_to_cpu(dir->direntlen) >= 0) { 883 /* 884 * blocksize-totalbytes because last 885 * directory length i.e., *dir->direntlen 886 * is free availble space in the block that 887 * means it is a last entry of directory entry 888 */ 889 if (dir->inode && (strlen(filename) == dir->namelen) && 890 (strncmp(ptr + sizeof(struct ext2_dirent), 891 filename, dir->namelen) == 0)) { 892 printf("file found, deleting\n"); 893 inodeno = le32_to_cpu(dir->inode); 894 if (previous_dir) { 895 uint16_t new_len; 896 new_len = le16_to_cpu(previous_dir->direntlen); 897 new_len += le16_to_cpu(dir->direntlen); 898 previous_dir->direntlen = cpu_to_le16(new_len); 899 } else { 900 dir->inode = 0; 901 } 902 found = 1; 903 break; 904 } 905 906 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) 907 break; 908 909 /* traversing the each directory entry */ 910 templength = le16_to_cpu(dir->direntlen); 911 totalbytes = totalbytes + templength; 912 previous_dir = dir; 913 dir = (struct ext2_dirent *)((char *)dir + templength); 914 ptr = (char *)dir; 915 } 916 917 918 if (found == 1) { 919 if (ext4fs_put_metadata(root_first_block_buffer, blknr)) 920 goto fail; 921 ret = inodeno; 922 } 923 fail: 924 free(root_first_block_buffer); 925 926 return ret; 927 } 928 929 int ext4fs_filename_unlink(char *filename) 930 { 931 int blk_idx; 932 long int blknr = -1; 933 int inodeno = -1; 934 uint32_t directory_blocks; 935 936 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 937 LOG2_BLOCK_SIZE(ext4fs_root); 938 939 /* read the block no allocated to a file */ 940 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 941 blknr = read_allocated_block(g_parent_inode, blk_idx); 942 if (blknr <= 0) 943 break; 944 inodeno = unlink_filename(filename, blknr); 945 if (inodeno != -1) 946 return inodeno; 947 } 948 949 return -1; 950 } 951 952 uint32_t ext4fs_get_new_blk_no(void) 953 { 954 short i; 955 short status; 956 int remainder; 957 unsigned int bg_idx; 958 static int prev_bg_bitmap_index = -1; 959 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 960 struct ext_filesystem *fs = get_fs(); 961 char *journal_buffer = zalloc(fs->blksz); 962 char *zero_buffer = zalloc(fs->blksz); 963 if (!journal_buffer || !zero_buffer) 964 goto fail; 965 966 if (fs->first_pass_bbmap == 0) { 967 for (i = 0; i < fs->no_blkgrp; i++) { 968 struct ext2_block_group *bgd = NULL; 969 bgd = ext4fs_get_group_descriptor(fs, i); 970 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 971 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 972 uint64_t b_bitmap_blk = 973 ext4fs_bg_get_block_id(bgd, fs); 974 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 975 memcpy(fs->blk_bmaps[i], zero_buffer, 976 fs->blksz); 977 put_ext4(b_bitmap_blk * fs->blksz, 978 fs->blk_bmaps[i], fs->blksz); 979 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 980 ext4fs_bg_set_flags(bgd, bg_flags); 981 } 982 fs->curr_blkno = 983 _get_new_blk_no(fs->blk_bmaps[i]); 984 if (fs->curr_blkno == -1) 985 /* block bitmap is completely filled */ 986 continue; 987 fs->curr_blkno = fs->curr_blkno + 988 (i * fs->blksz * 8); 989 fs->first_pass_bbmap++; 990 ext4fs_bg_free_blocks_dec(bgd, fs); 991 ext4fs_sb_free_blocks_dec(fs->sb); 992 status = ext4fs_devread(b_bitmap_blk * 993 fs->sect_perblk, 994 0, fs->blksz, 995 journal_buffer); 996 if (status == 0) 997 goto fail; 998 if (ext4fs_log_journal(journal_buffer, 999 b_bitmap_blk)) 1000 goto fail; 1001 goto success; 1002 } else { 1003 debug("no space left on block group %d\n", i); 1004 } 1005 } 1006 1007 goto fail; 1008 } else { 1009 fs->curr_blkno++; 1010 restart: 1011 /* get the blockbitmap index respective to blockno */ 1012 bg_idx = fs->curr_blkno / blk_per_grp; 1013 if (fs->blksz == 1024) { 1014 remainder = fs->curr_blkno % blk_per_grp; 1015 if (!remainder) 1016 bg_idx--; 1017 } 1018 1019 /* 1020 * To skip completely filled block group bitmaps 1021 * Optimize the block allocation 1022 */ 1023 if (bg_idx >= fs->no_blkgrp) 1024 goto fail; 1025 1026 struct ext2_block_group *bgd = NULL; 1027 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1028 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1029 debug("block group %u is full. Skipping\n", bg_idx); 1030 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1031 if (fs->blksz == 1024) 1032 fs->curr_blkno += 1; 1033 goto restart; 1034 } 1035 1036 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1037 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1038 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1039 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1040 put_ext4(b_bitmap_blk * fs->blksz, 1041 zero_buffer, fs->blksz); 1042 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1043 ext4fs_bg_set_flags(bgd, bg_flags); 1044 } 1045 1046 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1047 bg_idx) != 0) { 1048 debug("going for restart for the block no %ld %u\n", 1049 fs->curr_blkno, bg_idx); 1050 fs->curr_blkno++; 1051 goto restart; 1052 } 1053 1054 /* journal backup */ 1055 if (prev_bg_bitmap_index != bg_idx) { 1056 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1057 0, fs->blksz, journal_buffer); 1058 if (status == 0) 1059 goto fail; 1060 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1061 goto fail; 1062 1063 prev_bg_bitmap_index = bg_idx; 1064 } 1065 ext4fs_bg_free_blocks_dec(bgd, fs); 1066 ext4fs_sb_free_blocks_dec(fs->sb); 1067 goto success; 1068 } 1069 success: 1070 free(journal_buffer); 1071 free(zero_buffer); 1072 1073 return fs->curr_blkno; 1074 fail: 1075 free(journal_buffer); 1076 free(zero_buffer); 1077 1078 return -1; 1079 } 1080 1081 int ext4fs_get_new_inode_no(void) 1082 { 1083 short i; 1084 short status; 1085 unsigned int ibmap_idx; 1086 static int prev_inode_bitmap_index = -1; 1087 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1088 struct ext_filesystem *fs = get_fs(); 1089 char *journal_buffer = zalloc(fs->blksz); 1090 char *zero_buffer = zalloc(fs->blksz); 1091 if (!journal_buffer || !zero_buffer) 1092 goto fail; 1093 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1094 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1095 1096 if (fs->first_pass_ibmap == 0) { 1097 for (i = 0; i < fs->no_blkgrp; i++) { 1098 uint32_t free_inodes; 1099 struct ext2_block_group *bgd = NULL; 1100 bgd = ext4fs_get_group_descriptor(fs, i); 1101 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1102 if (free_inodes) { 1103 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1104 uint64_t i_bitmap_blk = 1105 ext4fs_bg_get_inode_id(bgd, fs); 1106 if (has_gdt_chksum) 1107 bgd->bg_itable_unused = free_inodes; 1108 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1109 put_ext4(i_bitmap_blk * fs->blksz, 1110 zero_buffer, fs->blksz); 1111 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1112 ext4fs_bg_set_flags(bgd, bg_flags); 1113 memcpy(fs->inode_bmaps[i], 1114 zero_buffer, fs->blksz); 1115 } 1116 fs->curr_inode_no = 1117 _get_new_inode_no(fs->inode_bmaps[i]); 1118 if (fs->curr_inode_no == -1) 1119 /* inode bitmap is completely filled */ 1120 continue; 1121 fs->curr_inode_no = fs->curr_inode_no + 1122 (i * inodes_per_grp); 1123 fs->first_pass_ibmap++; 1124 ext4fs_bg_free_inodes_dec(bgd, fs); 1125 if (has_gdt_chksum) 1126 ext4fs_bg_itable_unused_dec(bgd, fs); 1127 ext4fs_sb_free_inodes_dec(fs->sb); 1128 status = ext4fs_devread(i_bitmap_blk * 1129 fs->sect_perblk, 1130 0, fs->blksz, 1131 journal_buffer); 1132 if (status == 0) 1133 goto fail; 1134 if (ext4fs_log_journal(journal_buffer, 1135 i_bitmap_blk)) 1136 goto fail; 1137 goto success; 1138 } else 1139 debug("no inode left on block group %d\n", i); 1140 } 1141 goto fail; 1142 } else { 1143 restart: 1144 fs->curr_inode_no++; 1145 /* get the blockbitmap index respective to blockno */ 1146 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1147 struct ext2_block_group *bgd = 1148 ext4fs_get_group_descriptor(fs, ibmap_idx); 1149 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1150 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1151 1152 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1153 put_ext4(i_bitmap_blk * fs->blksz, 1154 zero_buffer, fs->blksz); 1155 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1156 ext4fs_bg_set_flags(bgd, bg_flags); 1157 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1158 fs->blksz); 1159 } 1160 1161 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1162 fs->inode_bmaps[ibmap_idx], 1163 ibmap_idx) != 0) { 1164 debug("going for restart for the block no %d %u\n", 1165 fs->curr_inode_no, ibmap_idx); 1166 goto restart; 1167 } 1168 1169 /* journal backup */ 1170 if (prev_inode_bitmap_index != ibmap_idx) { 1171 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1172 0, fs->blksz, journal_buffer); 1173 if (status == 0) 1174 goto fail; 1175 if (ext4fs_log_journal(journal_buffer, 1176 le32_to_cpu(bgd->inode_id))) 1177 goto fail; 1178 prev_inode_bitmap_index = ibmap_idx; 1179 } 1180 ext4fs_bg_free_inodes_dec(bgd, fs); 1181 if (has_gdt_chksum) 1182 bgd->bg_itable_unused = bgd->free_inodes; 1183 ext4fs_sb_free_inodes_dec(fs->sb); 1184 goto success; 1185 } 1186 1187 success: 1188 free(journal_buffer); 1189 free(zero_buffer); 1190 1191 return fs->curr_inode_no; 1192 fail: 1193 free(journal_buffer); 1194 free(zero_buffer); 1195 1196 return -1; 1197 1198 } 1199 1200 1201 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1202 unsigned int *total_remaining_blocks, 1203 unsigned int *no_blks_reqd) 1204 { 1205 short i; 1206 short status; 1207 long int actual_block_no; 1208 long int si_blockno; 1209 /* si :single indirect */ 1210 __le32 *si_buffer = NULL; 1211 __le32 *si_start_addr = NULL; 1212 struct ext_filesystem *fs = get_fs(); 1213 1214 if (*total_remaining_blocks != 0) { 1215 si_buffer = zalloc(fs->blksz); 1216 if (!si_buffer) { 1217 printf("No Memory\n"); 1218 return; 1219 } 1220 si_start_addr = si_buffer; 1221 si_blockno = ext4fs_get_new_blk_no(); 1222 if (si_blockno == -1) { 1223 printf("no block left to assign\n"); 1224 goto fail; 1225 } 1226 (*no_blks_reqd)++; 1227 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1228 1229 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1230 0, fs->blksz, (char *)si_buffer); 1231 memset(si_buffer, '\0', fs->blksz); 1232 if (status == 0) 1233 goto fail; 1234 1235 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1236 actual_block_no = ext4fs_get_new_blk_no(); 1237 if (actual_block_no == -1) { 1238 printf("no block left to assign\n"); 1239 goto fail; 1240 } 1241 *si_buffer = cpu_to_le32(actual_block_no); 1242 debug("SIAB %u: %u\n", *si_buffer, 1243 *total_remaining_blocks); 1244 1245 si_buffer++; 1246 (*total_remaining_blocks)--; 1247 if (*total_remaining_blocks == 0) 1248 break; 1249 } 1250 1251 /* write the block to disk */ 1252 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1253 si_start_addr, fs->blksz); 1254 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1255 } 1256 fail: 1257 free(si_start_addr); 1258 } 1259 1260 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1261 unsigned int *total_remaining_blocks, 1262 unsigned int *no_blks_reqd) 1263 { 1264 short i; 1265 short j; 1266 short status; 1267 long int actual_block_no; 1268 /* di:double indirect */ 1269 long int di_blockno_parent; 1270 long int di_blockno_child; 1271 __le32 *di_parent_buffer = NULL; 1272 __le32 *di_child_buff = NULL; 1273 __le32 *di_block_start_addr = NULL; 1274 __le32 *di_child_buff_start = NULL; 1275 struct ext_filesystem *fs = get_fs(); 1276 1277 if (*total_remaining_blocks != 0) { 1278 /* double indirect parent block connecting to inode */ 1279 di_blockno_parent = ext4fs_get_new_blk_no(); 1280 if (di_blockno_parent == -1) { 1281 printf("no block left to assign\n"); 1282 goto fail; 1283 } 1284 di_parent_buffer = zalloc(fs->blksz); 1285 if (!di_parent_buffer) 1286 goto fail; 1287 1288 di_block_start_addr = di_parent_buffer; 1289 (*no_blks_reqd)++; 1290 debug("DIPB %ld: %u\n", di_blockno_parent, 1291 *total_remaining_blocks); 1292 1293 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1294 fs->sect_perblk, 0, 1295 fs->blksz, (char *)di_parent_buffer); 1296 1297 if (!status) { 1298 printf("%s: Device read error!\n", __func__); 1299 goto fail; 1300 } 1301 memset(di_parent_buffer, '\0', fs->blksz); 1302 1303 /* 1304 * start:for each double indirect parent 1305 * block create one more block 1306 */ 1307 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1308 di_blockno_child = ext4fs_get_new_blk_no(); 1309 if (di_blockno_child == -1) { 1310 printf("no block left to assign\n"); 1311 goto fail; 1312 } 1313 di_child_buff = zalloc(fs->blksz); 1314 if (!di_child_buff) 1315 goto fail; 1316 1317 di_child_buff_start = di_child_buff; 1318 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1319 di_parent_buffer++; 1320 (*no_blks_reqd)++; 1321 debug("DICB %ld: %u\n", di_blockno_child, 1322 *total_remaining_blocks); 1323 1324 status = ext4fs_devread((lbaint_t)di_blockno_child * 1325 fs->sect_perblk, 0, 1326 fs->blksz, 1327 (char *)di_child_buff); 1328 1329 if (!status) { 1330 printf("%s: Device read error!\n", __func__); 1331 goto fail; 1332 } 1333 memset(di_child_buff, '\0', fs->blksz); 1334 /* filling of actual datablocks for each child */ 1335 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1336 actual_block_no = ext4fs_get_new_blk_no(); 1337 if (actual_block_no == -1) { 1338 printf("no block left to assign\n"); 1339 goto fail; 1340 } 1341 *di_child_buff = cpu_to_le32(actual_block_no); 1342 debug("DIAB %ld: %u\n", actual_block_no, 1343 *total_remaining_blocks); 1344 1345 di_child_buff++; 1346 (*total_remaining_blocks)--; 1347 if (*total_remaining_blocks == 0) 1348 break; 1349 } 1350 /* write the block table */ 1351 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1352 di_child_buff_start, fs->blksz); 1353 free(di_child_buff_start); 1354 di_child_buff_start = NULL; 1355 1356 if (*total_remaining_blocks == 0) 1357 break; 1358 } 1359 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1360 di_block_start_addr, fs->blksz); 1361 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1362 } 1363 fail: 1364 free(di_block_start_addr); 1365 } 1366 1367 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1368 unsigned int *total_remaining_blocks, 1369 unsigned int *no_blks_reqd) 1370 { 1371 short i; 1372 short j; 1373 short k; 1374 long int actual_block_no; 1375 /* ti: Triple Indirect */ 1376 long int ti_gp_blockno; 1377 long int ti_parent_blockno; 1378 long int ti_child_blockno; 1379 __le32 *ti_gp_buff = NULL; 1380 __le32 *ti_parent_buff = NULL; 1381 __le32 *ti_child_buff = NULL; 1382 __le32 *ti_gp_buff_start_addr = NULL; 1383 __le32 *ti_pbuff_start_addr = NULL; 1384 __le32 *ti_cbuff_start_addr = NULL; 1385 struct ext_filesystem *fs = get_fs(); 1386 if (*total_remaining_blocks != 0) { 1387 /* triple indirect grand parent block connecting to inode */ 1388 ti_gp_blockno = ext4fs_get_new_blk_no(); 1389 if (ti_gp_blockno == -1) { 1390 printf("no block left to assign\n"); 1391 return; 1392 } 1393 ti_gp_buff = zalloc(fs->blksz); 1394 if (!ti_gp_buff) 1395 return; 1396 1397 ti_gp_buff_start_addr = ti_gp_buff; 1398 (*no_blks_reqd)++; 1399 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1400 *total_remaining_blocks); 1401 1402 /* for each 4 byte grand parent entry create one more block */ 1403 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1404 ti_parent_blockno = ext4fs_get_new_blk_no(); 1405 if (ti_parent_blockno == -1) { 1406 printf("no block left to assign\n"); 1407 goto fail; 1408 } 1409 ti_parent_buff = zalloc(fs->blksz); 1410 if (!ti_parent_buff) 1411 goto fail; 1412 1413 ti_pbuff_start_addr = ti_parent_buff; 1414 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1415 ti_gp_buff++; 1416 (*no_blks_reqd)++; 1417 debug("TIPB %ld: %u\n", ti_parent_blockno, 1418 *total_remaining_blocks); 1419 1420 /* for each 4 byte entry parent create one more block */ 1421 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1422 ti_child_blockno = ext4fs_get_new_blk_no(); 1423 if (ti_child_blockno == -1) { 1424 printf("no block left assign\n"); 1425 goto fail1; 1426 } 1427 ti_child_buff = zalloc(fs->blksz); 1428 if (!ti_child_buff) 1429 goto fail1; 1430 1431 ti_cbuff_start_addr = ti_child_buff; 1432 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1433 ti_parent_buff++; 1434 (*no_blks_reqd)++; 1435 debug("TICB %ld: %u\n", ti_parent_blockno, 1436 *total_remaining_blocks); 1437 1438 /* fill actual datablocks for each child */ 1439 for (k = 0; k < (fs->blksz / sizeof(int)); 1440 k++) { 1441 actual_block_no = 1442 ext4fs_get_new_blk_no(); 1443 if (actual_block_no == -1) { 1444 printf("no block left\n"); 1445 free(ti_cbuff_start_addr); 1446 goto fail1; 1447 } 1448 *ti_child_buff = cpu_to_le32(actual_block_no); 1449 debug("TIAB %ld: %u\n", actual_block_no, 1450 *total_remaining_blocks); 1451 1452 ti_child_buff++; 1453 (*total_remaining_blocks)--; 1454 if (*total_remaining_blocks == 0) 1455 break; 1456 } 1457 /* write the child block */ 1458 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1459 (uint64_t)fs->blksz)), 1460 ti_cbuff_start_addr, fs->blksz); 1461 free(ti_cbuff_start_addr); 1462 1463 if (*total_remaining_blocks == 0) 1464 break; 1465 } 1466 /* write the parent block */ 1467 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1468 ti_pbuff_start_addr, fs->blksz); 1469 free(ti_pbuff_start_addr); 1470 1471 if (*total_remaining_blocks == 0) 1472 break; 1473 } 1474 /* write the grand parent block */ 1475 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1476 ti_gp_buff_start_addr, fs->blksz); 1477 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1478 free(ti_gp_buff_start_addr); 1479 return; 1480 } 1481 fail1: 1482 free(ti_pbuff_start_addr); 1483 fail: 1484 free(ti_gp_buff_start_addr); 1485 } 1486 1487 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1488 unsigned int total_remaining_blocks, 1489 unsigned int *total_no_of_block) 1490 { 1491 short i; 1492 long int direct_blockno; 1493 unsigned int no_blks_reqd = 0; 1494 1495 /* allocation of direct blocks */ 1496 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1497 direct_blockno = ext4fs_get_new_blk_no(); 1498 if (direct_blockno == -1) { 1499 printf("no block left to assign\n"); 1500 return; 1501 } 1502 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1503 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1504 1505 total_remaining_blocks--; 1506 } 1507 1508 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1509 &no_blks_reqd); 1510 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1511 &no_blks_reqd); 1512 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1513 &no_blks_reqd); 1514 *total_no_of_block += no_blks_reqd; 1515 } 1516 1517 #endif 1518 1519 static struct ext4_extent_header *ext4fs_get_extent_block 1520 (struct ext2_data *data, char *buf, 1521 struct ext4_extent_header *ext_block, 1522 uint32_t fileblock, int log2_blksz) 1523 { 1524 struct ext4_extent_idx *index; 1525 unsigned long long block; 1526 int blksz = EXT2_BLOCK_SIZE(data); 1527 int i; 1528 1529 while (1) { 1530 index = (struct ext4_extent_idx *)(ext_block + 1); 1531 1532 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1533 return NULL; 1534 1535 if (ext_block->eh_depth == 0) 1536 return ext_block; 1537 i = -1; 1538 do { 1539 i++; 1540 if (i >= le16_to_cpu(ext_block->eh_entries)) 1541 break; 1542 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1543 1544 if (--i < 0) 1545 return NULL; 1546 1547 block = le16_to_cpu(index[i].ei_leaf_hi); 1548 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1549 1550 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1551 buf)) 1552 ext_block = (struct ext4_extent_header *)buf; 1553 else 1554 return NULL; 1555 } 1556 } 1557 1558 static int ext4fs_blockgroup 1559 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1560 { 1561 long int blkno; 1562 unsigned int blkoff, desc_per_blk; 1563 int log2blksz = get_fs()->dev_desc->log2blksz; 1564 int desc_size = get_fs()->gdsize; 1565 1566 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1567 1568 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1569 group / desc_per_blk; 1570 blkoff = (group % desc_per_blk) * desc_size; 1571 1572 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1573 group, blkno, blkoff); 1574 1575 return ext4fs_devread((lbaint_t)blkno << 1576 (LOG2_BLOCK_SIZE(data) - log2blksz), 1577 blkoff, desc_size, (char *)blkgrp); 1578 } 1579 1580 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1581 { 1582 struct ext2_block_group blkgrp; 1583 struct ext2_sblock *sblock = &data->sblock; 1584 struct ext_filesystem *fs = get_fs(); 1585 int log2blksz = get_fs()->dev_desc->log2blksz; 1586 int inodes_per_block, status; 1587 long int blkno; 1588 unsigned int blkoff; 1589 1590 /* It is easier to calculate if the first inode is 0. */ 1591 ino--; 1592 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1593 (sblock->inodes_per_group), &blkgrp); 1594 if (status == 0) 1595 return 0; 1596 1597 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1598 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1599 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1600 blkoff = (ino % inodes_per_block) * fs->inodesz; 1601 /* Read the inode. */ 1602 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1603 log2blksz), blkoff, 1604 sizeof(struct ext2_inode), (char *)inode); 1605 if (status == 0) 1606 return 0; 1607 1608 return 1; 1609 } 1610 1611 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1612 { 1613 long int blknr; 1614 int blksz; 1615 int log2_blksz; 1616 int status; 1617 long int rblock; 1618 long int perblock_parent; 1619 long int perblock_child; 1620 unsigned long long start; 1621 /* get the blocksize of the filesystem */ 1622 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1623 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1624 - get_fs()->dev_desc->log2blksz; 1625 1626 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1627 char *buf = zalloc(blksz); 1628 if (!buf) 1629 return -ENOMEM; 1630 struct ext4_extent_header *ext_block; 1631 struct ext4_extent *extent; 1632 int i = -1; 1633 ext_block = 1634 ext4fs_get_extent_block(ext4fs_root, buf, 1635 (struct ext4_extent_header *) 1636 inode->b.blocks.dir_blocks, 1637 fileblock, log2_blksz); 1638 if (!ext_block) { 1639 printf("invalid extent block\n"); 1640 free(buf); 1641 return -EINVAL; 1642 } 1643 1644 extent = (struct ext4_extent *)(ext_block + 1); 1645 1646 do { 1647 i++; 1648 if (i >= le16_to_cpu(ext_block->eh_entries)) 1649 break; 1650 } while (fileblock >= le32_to_cpu(extent[i].ee_block)); 1651 if (--i >= 0) { 1652 fileblock -= le32_to_cpu(extent[i].ee_block); 1653 if (fileblock >= le16_to_cpu(extent[i].ee_len)) { 1654 free(buf); 1655 return 0; 1656 } 1657 1658 start = le16_to_cpu(extent[i].ee_start_hi); 1659 start = (start << 32) + 1660 le32_to_cpu(extent[i].ee_start_lo); 1661 free(buf); 1662 return fileblock + start; 1663 } 1664 1665 printf("Extent Error\n"); 1666 free(buf); 1667 return -1; 1668 } 1669 1670 /* Direct blocks. */ 1671 if (fileblock < INDIRECT_BLOCKS) 1672 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1673 1674 /* Indirect. */ 1675 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1676 if (ext4fs_indir1_block == NULL) { 1677 ext4fs_indir1_block = zalloc(blksz); 1678 if (ext4fs_indir1_block == NULL) { 1679 printf("** SI ext2fs read block (indir 1)" 1680 "malloc failed. **\n"); 1681 return -1; 1682 } 1683 ext4fs_indir1_size = blksz; 1684 ext4fs_indir1_blkno = -1; 1685 } 1686 if (blksz != ext4fs_indir1_size) { 1687 free(ext4fs_indir1_block); 1688 ext4fs_indir1_block = NULL; 1689 ext4fs_indir1_size = 0; 1690 ext4fs_indir1_blkno = -1; 1691 ext4fs_indir1_block = zalloc(blksz); 1692 if (ext4fs_indir1_block == NULL) { 1693 printf("** SI ext2fs read block (indir 1):" 1694 "malloc failed. **\n"); 1695 return -1; 1696 } 1697 ext4fs_indir1_size = blksz; 1698 } 1699 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1700 log2_blksz) != ext4fs_indir1_blkno) { 1701 status = 1702 ext4fs_devread((lbaint_t)le32_to_cpu 1703 (inode->b.blocks. 1704 indir_block) << log2_blksz, 0, 1705 blksz, (char *)ext4fs_indir1_block); 1706 if (status == 0) { 1707 printf("** SI ext2fs read block (indir 1)" 1708 "failed. **\n"); 1709 return -1; 1710 } 1711 ext4fs_indir1_blkno = 1712 le32_to_cpu(inode->b.blocks. 1713 indir_block) << log2_blksz; 1714 } 1715 blknr = le32_to_cpu(ext4fs_indir1_block 1716 [fileblock - INDIRECT_BLOCKS]); 1717 } 1718 /* Double indirect. */ 1719 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1720 (blksz / 4 + 1)))) { 1721 1722 long int perblock = blksz / 4; 1723 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1724 1725 if (ext4fs_indir1_block == NULL) { 1726 ext4fs_indir1_block = zalloc(blksz); 1727 if (ext4fs_indir1_block == NULL) { 1728 printf("** DI ext2fs read block (indir 2 1)" 1729 "malloc failed. **\n"); 1730 return -1; 1731 } 1732 ext4fs_indir1_size = blksz; 1733 ext4fs_indir1_blkno = -1; 1734 } 1735 if (blksz != ext4fs_indir1_size) { 1736 free(ext4fs_indir1_block); 1737 ext4fs_indir1_block = NULL; 1738 ext4fs_indir1_size = 0; 1739 ext4fs_indir1_blkno = -1; 1740 ext4fs_indir1_block = zalloc(blksz); 1741 if (ext4fs_indir1_block == NULL) { 1742 printf("** DI ext2fs read block (indir 2 1)" 1743 "malloc failed. **\n"); 1744 return -1; 1745 } 1746 ext4fs_indir1_size = blksz; 1747 } 1748 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1749 log2_blksz) != ext4fs_indir1_blkno) { 1750 status = 1751 ext4fs_devread((lbaint_t)le32_to_cpu 1752 (inode->b.blocks. 1753 double_indir_block) << log2_blksz, 1754 0, blksz, 1755 (char *)ext4fs_indir1_block); 1756 if (status == 0) { 1757 printf("** DI ext2fs read block (indir 2 1)" 1758 "failed. **\n"); 1759 return -1; 1760 } 1761 ext4fs_indir1_blkno = 1762 le32_to_cpu(inode->b.blocks.double_indir_block) << 1763 log2_blksz; 1764 } 1765 1766 if (ext4fs_indir2_block == NULL) { 1767 ext4fs_indir2_block = zalloc(blksz); 1768 if (ext4fs_indir2_block == NULL) { 1769 printf("** DI ext2fs read block (indir 2 2)" 1770 "malloc failed. **\n"); 1771 return -1; 1772 } 1773 ext4fs_indir2_size = blksz; 1774 ext4fs_indir2_blkno = -1; 1775 } 1776 if (blksz != ext4fs_indir2_size) { 1777 free(ext4fs_indir2_block); 1778 ext4fs_indir2_block = NULL; 1779 ext4fs_indir2_size = 0; 1780 ext4fs_indir2_blkno = -1; 1781 ext4fs_indir2_block = zalloc(blksz); 1782 if (ext4fs_indir2_block == NULL) { 1783 printf("** DI ext2fs read block (indir 2 2)" 1784 "malloc failed. **\n"); 1785 return -1; 1786 } 1787 ext4fs_indir2_size = blksz; 1788 } 1789 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1790 log2_blksz) != ext4fs_indir2_blkno) { 1791 status = ext4fs_devread((lbaint_t)le32_to_cpu 1792 (ext4fs_indir1_block 1793 [rblock / 1794 perblock]) << log2_blksz, 0, 1795 blksz, 1796 (char *)ext4fs_indir2_block); 1797 if (status == 0) { 1798 printf("** DI ext2fs read block (indir 2 2)" 1799 "failed. **\n"); 1800 return -1; 1801 } 1802 ext4fs_indir2_blkno = 1803 le32_to_cpu(ext4fs_indir1_block[rblock 1804 / 1805 perblock]) << 1806 log2_blksz; 1807 } 1808 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1809 } 1810 /* Tripple indirect. */ 1811 else { 1812 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1813 (blksz / 4 * blksz / 4)); 1814 perblock_child = blksz / 4; 1815 perblock_parent = ((blksz / 4) * (blksz / 4)); 1816 1817 if (ext4fs_indir1_block == NULL) { 1818 ext4fs_indir1_block = zalloc(blksz); 1819 if (ext4fs_indir1_block == NULL) { 1820 printf("** TI ext2fs read block (indir 2 1)" 1821 "malloc failed. **\n"); 1822 return -1; 1823 } 1824 ext4fs_indir1_size = blksz; 1825 ext4fs_indir1_blkno = -1; 1826 } 1827 if (blksz != ext4fs_indir1_size) { 1828 free(ext4fs_indir1_block); 1829 ext4fs_indir1_block = NULL; 1830 ext4fs_indir1_size = 0; 1831 ext4fs_indir1_blkno = -1; 1832 ext4fs_indir1_block = zalloc(blksz); 1833 if (ext4fs_indir1_block == NULL) { 1834 printf("** TI ext2fs read block (indir 2 1)" 1835 "malloc failed. **\n"); 1836 return -1; 1837 } 1838 ext4fs_indir1_size = blksz; 1839 } 1840 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1841 log2_blksz) != ext4fs_indir1_blkno) { 1842 status = ext4fs_devread 1843 ((lbaint_t) 1844 le32_to_cpu(inode->b.blocks.triple_indir_block) 1845 << log2_blksz, 0, blksz, 1846 (char *)ext4fs_indir1_block); 1847 if (status == 0) { 1848 printf("** TI ext2fs read block (indir 2 1)" 1849 "failed. **\n"); 1850 return -1; 1851 } 1852 ext4fs_indir1_blkno = 1853 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1854 log2_blksz; 1855 } 1856 1857 if (ext4fs_indir2_block == NULL) { 1858 ext4fs_indir2_block = zalloc(blksz); 1859 if (ext4fs_indir2_block == NULL) { 1860 printf("** TI ext2fs read block (indir 2 2)" 1861 "malloc failed. **\n"); 1862 return -1; 1863 } 1864 ext4fs_indir2_size = blksz; 1865 ext4fs_indir2_blkno = -1; 1866 } 1867 if (blksz != ext4fs_indir2_size) { 1868 free(ext4fs_indir2_block); 1869 ext4fs_indir2_block = NULL; 1870 ext4fs_indir2_size = 0; 1871 ext4fs_indir2_blkno = -1; 1872 ext4fs_indir2_block = zalloc(blksz); 1873 if (ext4fs_indir2_block == NULL) { 1874 printf("** TI ext2fs read block (indir 2 2)" 1875 "malloc failed. **\n"); 1876 return -1; 1877 } 1878 ext4fs_indir2_size = blksz; 1879 } 1880 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1881 perblock_parent]) << 1882 log2_blksz) 1883 != ext4fs_indir2_blkno) { 1884 status = ext4fs_devread((lbaint_t)le32_to_cpu 1885 (ext4fs_indir1_block 1886 [rblock / 1887 perblock_parent]) << 1888 log2_blksz, 0, blksz, 1889 (char *)ext4fs_indir2_block); 1890 if (status == 0) { 1891 printf("** TI ext2fs read block (indir 2 2)" 1892 "failed. **\n"); 1893 return -1; 1894 } 1895 ext4fs_indir2_blkno = 1896 le32_to_cpu(ext4fs_indir1_block[rblock / 1897 perblock_parent]) 1898 << log2_blksz; 1899 } 1900 1901 if (ext4fs_indir3_block == NULL) { 1902 ext4fs_indir3_block = zalloc(blksz); 1903 if (ext4fs_indir3_block == NULL) { 1904 printf("** TI ext2fs read block (indir 2 2)" 1905 "malloc failed. **\n"); 1906 return -1; 1907 } 1908 ext4fs_indir3_size = blksz; 1909 ext4fs_indir3_blkno = -1; 1910 } 1911 if (blksz != ext4fs_indir3_size) { 1912 free(ext4fs_indir3_block); 1913 ext4fs_indir3_block = NULL; 1914 ext4fs_indir3_size = 0; 1915 ext4fs_indir3_blkno = -1; 1916 ext4fs_indir3_block = zalloc(blksz); 1917 if (ext4fs_indir3_block == NULL) { 1918 printf("** TI ext2fs read block (indir 2 2)" 1919 "malloc failed. **\n"); 1920 return -1; 1921 } 1922 ext4fs_indir3_size = blksz; 1923 } 1924 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1925 / 1926 perblock_child]) << 1927 log2_blksz) != ext4fs_indir3_blkno) { 1928 status = 1929 ext4fs_devread((lbaint_t)le32_to_cpu 1930 (ext4fs_indir2_block 1931 [(rblock / perblock_child) 1932 % (blksz / 4)]) << log2_blksz, 0, 1933 blksz, (char *)ext4fs_indir3_block); 1934 if (status == 0) { 1935 printf("** TI ext2fs read block (indir 2 2)" 1936 "failed. **\n"); 1937 return -1; 1938 } 1939 ext4fs_indir3_blkno = 1940 le32_to_cpu(ext4fs_indir2_block[(rblock / 1941 perblock_child) % 1942 (blksz / 1943 4)]) << 1944 log2_blksz; 1945 } 1946 1947 blknr = le32_to_cpu(ext4fs_indir3_block 1948 [rblock % perblock_child]); 1949 } 1950 debug("read_allocated_block %ld\n", blknr); 1951 1952 return blknr; 1953 } 1954 1955 /** 1956 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1957 * global pointers 1958 * 1959 * This function assures that for a file with the same name but different size 1960 * the sequential store on the ext4 filesystem will be correct. 1961 * 1962 * In this function the global data, responsible for internal representation 1963 * of the ext4 data are initialized to the reset state. Without this, during 1964 * replacement of the smaller file with the bigger truncation of new file was 1965 * performed. 1966 */ 1967 void ext4fs_reinit_global(void) 1968 { 1969 if (ext4fs_indir1_block != NULL) { 1970 free(ext4fs_indir1_block); 1971 ext4fs_indir1_block = NULL; 1972 ext4fs_indir1_size = 0; 1973 ext4fs_indir1_blkno = -1; 1974 } 1975 if (ext4fs_indir2_block != NULL) { 1976 free(ext4fs_indir2_block); 1977 ext4fs_indir2_block = NULL; 1978 ext4fs_indir2_size = 0; 1979 ext4fs_indir2_blkno = -1; 1980 } 1981 if (ext4fs_indir3_block != NULL) { 1982 free(ext4fs_indir3_block); 1983 ext4fs_indir3_block = NULL; 1984 ext4fs_indir3_size = 0; 1985 ext4fs_indir3_blkno = -1; 1986 } 1987 } 1988 void ext4fs_close(void) 1989 { 1990 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1991 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1992 ext4fs_file = NULL; 1993 } 1994 if (ext4fs_root != NULL) { 1995 free(ext4fs_root); 1996 ext4fs_root = NULL; 1997 } 1998 1999 ext4fs_reinit_global(); 2000 } 2001 2002 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 2003 struct ext2fs_node **fnode, int *ftype) 2004 { 2005 unsigned int fpos = 0; 2006 int status; 2007 loff_t actread; 2008 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 2009 2010 #ifdef DEBUG 2011 if (name != NULL) 2012 printf("Iterate dir %s\n", name); 2013 #endif /* of DEBUG */ 2014 if (!diro->inode_read) { 2015 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2016 if (status == 0) 2017 return 0; 2018 } 2019 /* Search the file. */ 2020 while (fpos < le32_to_cpu(diro->inode.size)) { 2021 struct ext2_dirent dirent; 2022 2023 status = ext4fs_read_file(diro, fpos, 2024 sizeof(struct ext2_dirent), 2025 (char *)&dirent, &actread); 2026 if (status < 0) 2027 return 0; 2028 2029 if (dirent.direntlen == 0) { 2030 printf("Failed to iterate over directory %s\n", name); 2031 return 0; 2032 } 2033 2034 if (dirent.namelen != 0) { 2035 char filename[dirent.namelen + 1]; 2036 struct ext2fs_node *fdiro; 2037 int type = FILETYPE_UNKNOWN; 2038 2039 status = ext4fs_read_file(diro, 2040 fpos + 2041 sizeof(struct ext2_dirent), 2042 dirent.namelen, filename, 2043 &actread); 2044 if (status < 0) 2045 return 0; 2046 2047 fdiro = zalloc(sizeof(struct ext2fs_node)); 2048 if (!fdiro) 2049 return 0; 2050 2051 fdiro->data = diro->data; 2052 fdiro->ino = le32_to_cpu(dirent.inode); 2053 2054 filename[dirent.namelen] = '\0'; 2055 2056 if (dirent.filetype != FILETYPE_UNKNOWN) { 2057 fdiro->inode_read = 0; 2058 2059 if (dirent.filetype == FILETYPE_DIRECTORY) 2060 type = FILETYPE_DIRECTORY; 2061 else if (dirent.filetype == FILETYPE_SYMLINK) 2062 type = FILETYPE_SYMLINK; 2063 else if (dirent.filetype == FILETYPE_REG) 2064 type = FILETYPE_REG; 2065 } else { 2066 status = ext4fs_read_inode(diro->data, 2067 le32_to_cpu 2068 (dirent.inode), 2069 &fdiro->inode); 2070 if (status == 0) { 2071 free(fdiro); 2072 return 0; 2073 } 2074 fdiro->inode_read = 1; 2075 2076 if ((le16_to_cpu(fdiro->inode.mode) & 2077 FILETYPE_INO_MASK) == 2078 FILETYPE_INO_DIRECTORY) { 2079 type = FILETYPE_DIRECTORY; 2080 } else if ((le16_to_cpu(fdiro->inode.mode) 2081 & FILETYPE_INO_MASK) == 2082 FILETYPE_INO_SYMLINK) { 2083 type = FILETYPE_SYMLINK; 2084 } else if ((le16_to_cpu(fdiro->inode.mode) 2085 & FILETYPE_INO_MASK) == 2086 FILETYPE_INO_REG) { 2087 type = FILETYPE_REG; 2088 } 2089 } 2090 #ifdef DEBUG 2091 printf("iterate >%s<\n", filename); 2092 #endif /* of DEBUG */ 2093 if ((name != NULL) && (fnode != NULL) 2094 && (ftype != NULL)) { 2095 if (strcmp(filename, name) == 0) { 2096 *ftype = type; 2097 *fnode = fdiro; 2098 return 1; 2099 } 2100 } else { 2101 if (fdiro->inode_read == 0) { 2102 status = ext4fs_read_inode(diro->data, 2103 le32_to_cpu( 2104 dirent.inode), 2105 &fdiro->inode); 2106 if (status == 0) { 2107 free(fdiro); 2108 return 0; 2109 } 2110 fdiro->inode_read = 1; 2111 } 2112 switch (type) { 2113 case FILETYPE_DIRECTORY: 2114 printf("<DIR> "); 2115 break; 2116 case FILETYPE_SYMLINK: 2117 printf("<SYM> "); 2118 break; 2119 case FILETYPE_REG: 2120 printf(" "); 2121 break; 2122 default: 2123 printf("< ? > "); 2124 break; 2125 } 2126 printf("%10u %s\n", 2127 le32_to_cpu(fdiro->inode.size), 2128 filename); 2129 } 2130 free(fdiro); 2131 } 2132 fpos += le16_to_cpu(dirent.direntlen); 2133 } 2134 return 0; 2135 } 2136 2137 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2138 { 2139 char *symlink; 2140 struct ext2fs_node *diro = node; 2141 int status; 2142 loff_t actread; 2143 2144 if (!diro->inode_read) { 2145 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2146 if (status == 0) 2147 return NULL; 2148 } 2149 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2150 if (!symlink) 2151 return NULL; 2152 2153 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2154 strncpy(symlink, diro->inode.b.symlink, 2155 le32_to_cpu(diro->inode.size)); 2156 } else { 2157 status = ext4fs_read_file(diro, 0, 2158 le32_to_cpu(diro->inode.size), 2159 symlink, &actread); 2160 if ((status < 0) || (actread == 0)) { 2161 free(symlink); 2162 return NULL; 2163 } 2164 } 2165 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2166 return symlink; 2167 } 2168 2169 static int ext4fs_find_file1(const char *currpath, 2170 struct ext2fs_node *currroot, 2171 struct ext2fs_node **currfound, int *foundtype) 2172 { 2173 char fpath[strlen(currpath) + 1]; 2174 char *name = fpath; 2175 char *next; 2176 int status; 2177 int type = FILETYPE_DIRECTORY; 2178 struct ext2fs_node *currnode = currroot; 2179 struct ext2fs_node *oldnode = currroot; 2180 2181 strncpy(fpath, currpath, strlen(currpath) + 1); 2182 2183 /* Remove all leading slashes. */ 2184 while (*name == '/') 2185 name++; 2186 2187 if (!*name) { 2188 *currfound = currnode; 2189 return 1; 2190 } 2191 2192 for (;;) { 2193 int found; 2194 2195 /* Extract the actual part from the pathname. */ 2196 next = strchr(name, '/'); 2197 if (next) { 2198 /* Remove all leading slashes. */ 2199 while (*next == '/') 2200 *(next++) = '\0'; 2201 } 2202 2203 if (type != FILETYPE_DIRECTORY) { 2204 ext4fs_free_node(currnode, currroot); 2205 return 0; 2206 } 2207 2208 oldnode = currnode; 2209 2210 /* Iterate over the directory. */ 2211 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2212 if (found == 0) 2213 return 0; 2214 2215 if (found == -1) 2216 break; 2217 2218 /* Read in the symlink and follow it. */ 2219 if (type == FILETYPE_SYMLINK) { 2220 char *symlink; 2221 2222 /* Test if the symlink does not loop. */ 2223 if (++symlinknest == 8) { 2224 ext4fs_free_node(currnode, currroot); 2225 ext4fs_free_node(oldnode, currroot); 2226 return 0; 2227 } 2228 2229 symlink = ext4fs_read_symlink(currnode); 2230 ext4fs_free_node(currnode, currroot); 2231 2232 if (!symlink) { 2233 ext4fs_free_node(oldnode, currroot); 2234 return 0; 2235 } 2236 2237 debug("Got symlink >%s<\n", symlink); 2238 2239 if (symlink[0] == '/') { 2240 ext4fs_free_node(oldnode, currroot); 2241 oldnode = &ext4fs_root->diropen; 2242 } 2243 2244 /* Lookup the node the symlink points to. */ 2245 status = ext4fs_find_file1(symlink, oldnode, 2246 &currnode, &type); 2247 2248 free(symlink); 2249 2250 if (status == 0) { 2251 ext4fs_free_node(oldnode, currroot); 2252 return 0; 2253 } 2254 } 2255 2256 ext4fs_free_node(oldnode, currroot); 2257 2258 /* Found the node! */ 2259 if (!next || *next == '\0') { 2260 *currfound = currnode; 2261 *foundtype = type; 2262 return 1; 2263 } 2264 name = next; 2265 } 2266 return -1; 2267 } 2268 2269 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2270 struct ext2fs_node **foundnode, int expecttype) 2271 { 2272 int status; 2273 int foundtype = FILETYPE_DIRECTORY; 2274 2275 symlinknest = 0; 2276 if (!path) 2277 return 0; 2278 2279 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2280 if (status == 0) 2281 return 0; 2282 2283 /* Check if the node that was found was of the expected type. */ 2284 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2285 return 0; 2286 else if ((expecttype == FILETYPE_DIRECTORY) 2287 && (foundtype != expecttype)) 2288 return 0; 2289 2290 return 1; 2291 } 2292 2293 int ext4fs_open(const char *filename, loff_t *len) 2294 { 2295 struct ext2fs_node *fdiro = NULL; 2296 int status; 2297 2298 if (ext4fs_root == NULL) 2299 return -1; 2300 2301 ext4fs_file = NULL; 2302 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2303 FILETYPE_REG); 2304 if (status == 0) 2305 goto fail; 2306 2307 if (!fdiro->inode_read) { 2308 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2309 &fdiro->inode); 2310 if (status == 0) 2311 goto fail; 2312 } 2313 *len = le32_to_cpu(fdiro->inode.size); 2314 ext4fs_file = fdiro; 2315 2316 return 0; 2317 fail: 2318 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2319 2320 return -1; 2321 } 2322 2323 int ext4fs_mount(unsigned part_length) 2324 { 2325 struct ext2_data *data; 2326 int status; 2327 struct ext_filesystem *fs = get_fs(); 2328 data = zalloc(SUPERBLOCK_SIZE); 2329 if (!data) 2330 return 0; 2331 2332 /* Read the superblock. */ 2333 status = ext4_read_superblock((char *)&data->sblock); 2334 2335 if (status == 0) 2336 goto fail; 2337 2338 /* Make sure this is an ext2 filesystem. */ 2339 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2340 goto fail; 2341 2342 2343 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2344 fs->inodesz = 128; 2345 } else { 2346 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2347 __le32_to_cpu(data->sblock.feature_compatibility), 2348 __le32_to_cpu(data->sblock.feature_incompat), 2349 __le32_to_cpu(data->sblock.feature_ro_compat)); 2350 2351 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2352 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2353 EXT4_FEATURE_INCOMPAT_64BIT ? 2354 le16_to_cpu(data->sblock.descriptor_size) : 32; 2355 } 2356 2357 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2358 le32_to_cpu(data->sblock.revision_level), 2359 fs->inodesz, fs->gdsize); 2360 2361 data->diropen.data = data; 2362 data->diropen.ino = 2; 2363 data->diropen.inode_read = 1; 2364 data->inode = &data->diropen.inode; 2365 2366 status = ext4fs_read_inode(data, 2, data->inode); 2367 if (status == 0) 2368 goto fail; 2369 2370 ext4fs_root = data; 2371 2372 return 1; 2373 fail: 2374 printf("Failed to mount ext2 filesystem...\n"); 2375 free(data); 2376 ext4fs_root = NULL; 2377 2378 return 0; 2379 } 2380