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 status; 858 int inodeno = 0; 859 int offset; 860 char *block_buffer = NULL; 861 struct ext2_dirent *dir = NULL; 862 struct ext2_dirent *previous_dir; 863 struct ext_filesystem *fs = get_fs(); 864 int ret = -1; 865 char *direntname; 866 867 block_buffer = zalloc(fs->blksz); 868 if (!block_buffer) 869 return -ENOMEM; 870 871 /* read the directory block */ 872 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 873 fs->blksz, block_buffer); 874 if (status == 0) 875 goto fail; 876 877 if (ext4fs_log_journal(block_buffer, blknr)) 878 goto fail; 879 offset = 0; 880 do { 881 previous_dir = dir; 882 dir = (struct ext2_dirent *)(block_buffer + offset); 883 direntname = (char *)(dir) + sizeof(struct ext2_dirent); 884 885 int direntlen = le16_to_cpu(dir->direntlen); 886 if (direntlen < sizeof(struct ext2_dirent)) 887 break; 888 889 if (dir->inode && (strlen(filename) == dir->namelen) && 890 (strncmp(direntname, filename, dir->namelen) == 0)) { 891 inodeno = le32_to_cpu(dir->inode); 892 if (previous_dir) { 893 uint16_t new_len; 894 new_len = le16_to_cpu(previous_dir->direntlen); 895 new_len += le16_to_cpu(dir->direntlen); 896 previous_dir->direntlen = cpu_to_le16(new_len); 897 } else { 898 dir->inode = 0; 899 } 900 break; 901 } 902 903 offset += direntlen; 904 905 } while (offset < fs->blksz); 906 907 if (inodeno > 0) { 908 909 if (ext4fs_put_metadata(block_buffer, blknr)) 910 goto fail; 911 ret = inodeno; 912 } 913 fail: 914 free(block_buffer); 915 916 return ret; 917 } 918 919 int ext4fs_filename_unlink(char *filename) 920 { 921 int blk_idx; 922 long int blknr = -1; 923 int inodeno = -1; 924 uint32_t directory_blocks; 925 926 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 927 LOG2_BLOCK_SIZE(ext4fs_root); 928 929 /* read the block no allocated to a file */ 930 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 931 blknr = read_allocated_block(g_parent_inode, blk_idx); 932 if (blknr <= 0) 933 break; 934 inodeno = unlink_filename(filename, blknr); 935 if (inodeno != -1) 936 return inodeno; 937 } 938 939 return -1; 940 } 941 942 uint32_t ext4fs_get_new_blk_no(void) 943 { 944 short i; 945 short status; 946 int remainder; 947 unsigned int bg_idx; 948 static int prev_bg_bitmap_index = -1; 949 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 950 struct ext_filesystem *fs = get_fs(); 951 char *journal_buffer = zalloc(fs->blksz); 952 char *zero_buffer = zalloc(fs->blksz); 953 if (!journal_buffer || !zero_buffer) 954 goto fail; 955 956 if (fs->first_pass_bbmap == 0) { 957 for (i = 0; i < fs->no_blkgrp; i++) { 958 struct ext2_block_group *bgd = NULL; 959 bgd = ext4fs_get_group_descriptor(fs, i); 960 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 961 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 962 uint64_t b_bitmap_blk = 963 ext4fs_bg_get_block_id(bgd, fs); 964 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 965 memcpy(fs->blk_bmaps[i], zero_buffer, 966 fs->blksz); 967 put_ext4(b_bitmap_blk * fs->blksz, 968 fs->blk_bmaps[i], fs->blksz); 969 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 970 ext4fs_bg_set_flags(bgd, bg_flags); 971 } 972 fs->curr_blkno = 973 _get_new_blk_no(fs->blk_bmaps[i]); 974 if (fs->curr_blkno == -1) 975 /* block bitmap is completely filled */ 976 continue; 977 fs->curr_blkno = fs->curr_blkno + 978 (i * fs->blksz * 8); 979 fs->first_pass_bbmap++; 980 ext4fs_bg_free_blocks_dec(bgd, fs); 981 ext4fs_sb_free_blocks_dec(fs->sb); 982 status = ext4fs_devread(b_bitmap_blk * 983 fs->sect_perblk, 984 0, fs->blksz, 985 journal_buffer); 986 if (status == 0) 987 goto fail; 988 if (ext4fs_log_journal(journal_buffer, 989 b_bitmap_blk)) 990 goto fail; 991 goto success; 992 } else { 993 debug("no space left on block group %d\n", i); 994 } 995 } 996 997 goto fail; 998 } else { 999 fs->curr_blkno++; 1000 restart: 1001 /* get the blockbitmap index respective to blockno */ 1002 bg_idx = fs->curr_blkno / blk_per_grp; 1003 if (fs->blksz == 1024) { 1004 remainder = fs->curr_blkno % blk_per_grp; 1005 if (!remainder) 1006 bg_idx--; 1007 } 1008 1009 /* 1010 * To skip completely filled block group bitmaps 1011 * Optimize the block allocation 1012 */ 1013 if (bg_idx >= fs->no_blkgrp) 1014 goto fail; 1015 1016 struct ext2_block_group *bgd = NULL; 1017 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1018 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1019 debug("block group %u is full. Skipping\n", bg_idx); 1020 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1021 if (fs->blksz == 1024) 1022 fs->curr_blkno += 1; 1023 goto restart; 1024 } 1025 1026 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1027 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1028 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1029 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1030 put_ext4(b_bitmap_blk * fs->blksz, 1031 zero_buffer, fs->blksz); 1032 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1033 ext4fs_bg_set_flags(bgd, bg_flags); 1034 } 1035 1036 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1037 bg_idx) != 0) { 1038 debug("going for restart for the block no %ld %u\n", 1039 fs->curr_blkno, bg_idx); 1040 fs->curr_blkno++; 1041 goto restart; 1042 } 1043 1044 /* journal backup */ 1045 if (prev_bg_bitmap_index != bg_idx) { 1046 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1047 0, fs->blksz, journal_buffer); 1048 if (status == 0) 1049 goto fail; 1050 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1051 goto fail; 1052 1053 prev_bg_bitmap_index = bg_idx; 1054 } 1055 ext4fs_bg_free_blocks_dec(bgd, fs); 1056 ext4fs_sb_free_blocks_dec(fs->sb); 1057 goto success; 1058 } 1059 success: 1060 free(journal_buffer); 1061 free(zero_buffer); 1062 1063 return fs->curr_blkno; 1064 fail: 1065 free(journal_buffer); 1066 free(zero_buffer); 1067 1068 return -1; 1069 } 1070 1071 int ext4fs_get_new_inode_no(void) 1072 { 1073 short i; 1074 short status; 1075 unsigned int ibmap_idx; 1076 static int prev_inode_bitmap_index = -1; 1077 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1078 struct ext_filesystem *fs = get_fs(); 1079 char *journal_buffer = zalloc(fs->blksz); 1080 char *zero_buffer = zalloc(fs->blksz); 1081 if (!journal_buffer || !zero_buffer) 1082 goto fail; 1083 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1084 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1085 1086 if (fs->first_pass_ibmap == 0) { 1087 for (i = 0; i < fs->no_blkgrp; i++) { 1088 uint32_t free_inodes; 1089 struct ext2_block_group *bgd = NULL; 1090 bgd = ext4fs_get_group_descriptor(fs, i); 1091 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1092 if (free_inodes) { 1093 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1094 uint64_t i_bitmap_blk = 1095 ext4fs_bg_get_inode_id(bgd, fs); 1096 if (has_gdt_chksum) 1097 bgd->bg_itable_unused = free_inodes; 1098 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1099 put_ext4(i_bitmap_blk * fs->blksz, 1100 zero_buffer, fs->blksz); 1101 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1102 ext4fs_bg_set_flags(bgd, bg_flags); 1103 memcpy(fs->inode_bmaps[i], 1104 zero_buffer, fs->blksz); 1105 } 1106 fs->curr_inode_no = 1107 _get_new_inode_no(fs->inode_bmaps[i]); 1108 if (fs->curr_inode_no == -1) 1109 /* inode bitmap is completely filled */ 1110 continue; 1111 fs->curr_inode_no = fs->curr_inode_no + 1112 (i * inodes_per_grp); 1113 fs->first_pass_ibmap++; 1114 ext4fs_bg_free_inodes_dec(bgd, fs); 1115 if (has_gdt_chksum) 1116 ext4fs_bg_itable_unused_dec(bgd, fs); 1117 ext4fs_sb_free_inodes_dec(fs->sb); 1118 status = ext4fs_devread(i_bitmap_blk * 1119 fs->sect_perblk, 1120 0, fs->blksz, 1121 journal_buffer); 1122 if (status == 0) 1123 goto fail; 1124 if (ext4fs_log_journal(journal_buffer, 1125 i_bitmap_blk)) 1126 goto fail; 1127 goto success; 1128 } else 1129 debug("no inode left on block group %d\n", i); 1130 } 1131 goto fail; 1132 } else { 1133 restart: 1134 fs->curr_inode_no++; 1135 /* get the blockbitmap index respective to blockno */ 1136 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1137 struct ext2_block_group *bgd = 1138 ext4fs_get_group_descriptor(fs, ibmap_idx); 1139 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1140 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1141 1142 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1143 put_ext4(i_bitmap_blk * fs->blksz, 1144 zero_buffer, fs->blksz); 1145 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1146 ext4fs_bg_set_flags(bgd, bg_flags); 1147 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1148 fs->blksz); 1149 } 1150 1151 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1152 fs->inode_bmaps[ibmap_idx], 1153 ibmap_idx) != 0) { 1154 debug("going for restart for the block no %d %u\n", 1155 fs->curr_inode_no, ibmap_idx); 1156 goto restart; 1157 } 1158 1159 /* journal backup */ 1160 if (prev_inode_bitmap_index != ibmap_idx) { 1161 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1162 0, fs->blksz, journal_buffer); 1163 if (status == 0) 1164 goto fail; 1165 if (ext4fs_log_journal(journal_buffer, 1166 le32_to_cpu(bgd->inode_id))) 1167 goto fail; 1168 prev_inode_bitmap_index = ibmap_idx; 1169 } 1170 ext4fs_bg_free_inodes_dec(bgd, fs); 1171 if (has_gdt_chksum) 1172 bgd->bg_itable_unused = bgd->free_inodes; 1173 ext4fs_sb_free_inodes_dec(fs->sb); 1174 goto success; 1175 } 1176 1177 success: 1178 free(journal_buffer); 1179 free(zero_buffer); 1180 1181 return fs->curr_inode_no; 1182 fail: 1183 free(journal_buffer); 1184 free(zero_buffer); 1185 1186 return -1; 1187 1188 } 1189 1190 1191 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1192 unsigned int *total_remaining_blocks, 1193 unsigned int *no_blks_reqd) 1194 { 1195 short i; 1196 short status; 1197 long int actual_block_no; 1198 long int si_blockno; 1199 /* si :single indirect */ 1200 __le32 *si_buffer = NULL; 1201 __le32 *si_start_addr = NULL; 1202 struct ext_filesystem *fs = get_fs(); 1203 1204 if (*total_remaining_blocks != 0) { 1205 si_buffer = zalloc(fs->blksz); 1206 if (!si_buffer) { 1207 printf("No Memory\n"); 1208 return; 1209 } 1210 si_start_addr = si_buffer; 1211 si_blockno = ext4fs_get_new_blk_no(); 1212 if (si_blockno == -1) { 1213 printf("no block left to assign\n"); 1214 goto fail; 1215 } 1216 (*no_blks_reqd)++; 1217 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1218 1219 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1220 0, fs->blksz, (char *)si_buffer); 1221 memset(si_buffer, '\0', fs->blksz); 1222 if (status == 0) 1223 goto fail; 1224 1225 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1226 actual_block_no = ext4fs_get_new_blk_no(); 1227 if (actual_block_no == -1) { 1228 printf("no block left to assign\n"); 1229 goto fail; 1230 } 1231 *si_buffer = cpu_to_le32(actual_block_no); 1232 debug("SIAB %u: %u\n", *si_buffer, 1233 *total_remaining_blocks); 1234 1235 si_buffer++; 1236 (*total_remaining_blocks)--; 1237 if (*total_remaining_blocks == 0) 1238 break; 1239 } 1240 1241 /* write the block to disk */ 1242 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1243 si_start_addr, fs->blksz); 1244 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1245 } 1246 fail: 1247 free(si_start_addr); 1248 } 1249 1250 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1251 unsigned int *total_remaining_blocks, 1252 unsigned int *no_blks_reqd) 1253 { 1254 short i; 1255 short j; 1256 short status; 1257 long int actual_block_no; 1258 /* di:double indirect */ 1259 long int di_blockno_parent; 1260 long int di_blockno_child; 1261 __le32 *di_parent_buffer = NULL; 1262 __le32 *di_child_buff = NULL; 1263 __le32 *di_block_start_addr = NULL; 1264 __le32 *di_child_buff_start = NULL; 1265 struct ext_filesystem *fs = get_fs(); 1266 1267 if (*total_remaining_blocks != 0) { 1268 /* double indirect parent block connecting to inode */ 1269 di_blockno_parent = ext4fs_get_new_blk_no(); 1270 if (di_blockno_parent == -1) { 1271 printf("no block left to assign\n"); 1272 goto fail; 1273 } 1274 di_parent_buffer = zalloc(fs->blksz); 1275 if (!di_parent_buffer) 1276 goto fail; 1277 1278 di_block_start_addr = di_parent_buffer; 1279 (*no_blks_reqd)++; 1280 debug("DIPB %ld: %u\n", di_blockno_parent, 1281 *total_remaining_blocks); 1282 1283 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1284 fs->sect_perblk, 0, 1285 fs->blksz, (char *)di_parent_buffer); 1286 1287 if (!status) { 1288 printf("%s: Device read error!\n", __func__); 1289 goto fail; 1290 } 1291 memset(di_parent_buffer, '\0', fs->blksz); 1292 1293 /* 1294 * start:for each double indirect parent 1295 * block create one more block 1296 */ 1297 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1298 di_blockno_child = ext4fs_get_new_blk_no(); 1299 if (di_blockno_child == -1) { 1300 printf("no block left to assign\n"); 1301 goto fail; 1302 } 1303 di_child_buff = zalloc(fs->blksz); 1304 if (!di_child_buff) 1305 goto fail; 1306 1307 di_child_buff_start = di_child_buff; 1308 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1309 di_parent_buffer++; 1310 (*no_blks_reqd)++; 1311 debug("DICB %ld: %u\n", di_blockno_child, 1312 *total_remaining_blocks); 1313 1314 status = ext4fs_devread((lbaint_t)di_blockno_child * 1315 fs->sect_perblk, 0, 1316 fs->blksz, 1317 (char *)di_child_buff); 1318 1319 if (!status) { 1320 printf("%s: Device read error!\n", __func__); 1321 goto fail; 1322 } 1323 memset(di_child_buff, '\0', fs->blksz); 1324 /* filling of actual datablocks for each child */ 1325 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1326 actual_block_no = ext4fs_get_new_blk_no(); 1327 if (actual_block_no == -1) { 1328 printf("no block left to assign\n"); 1329 goto fail; 1330 } 1331 *di_child_buff = cpu_to_le32(actual_block_no); 1332 debug("DIAB %ld: %u\n", actual_block_no, 1333 *total_remaining_blocks); 1334 1335 di_child_buff++; 1336 (*total_remaining_blocks)--; 1337 if (*total_remaining_blocks == 0) 1338 break; 1339 } 1340 /* write the block table */ 1341 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1342 di_child_buff_start, fs->blksz); 1343 free(di_child_buff_start); 1344 di_child_buff_start = NULL; 1345 1346 if (*total_remaining_blocks == 0) 1347 break; 1348 } 1349 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1350 di_block_start_addr, fs->blksz); 1351 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1352 } 1353 fail: 1354 free(di_block_start_addr); 1355 } 1356 1357 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1358 unsigned int *total_remaining_blocks, 1359 unsigned int *no_blks_reqd) 1360 { 1361 short i; 1362 short j; 1363 short k; 1364 long int actual_block_no; 1365 /* ti: Triple Indirect */ 1366 long int ti_gp_blockno; 1367 long int ti_parent_blockno; 1368 long int ti_child_blockno; 1369 __le32 *ti_gp_buff = NULL; 1370 __le32 *ti_parent_buff = NULL; 1371 __le32 *ti_child_buff = NULL; 1372 __le32 *ti_gp_buff_start_addr = NULL; 1373 __le32 *ti_pbuff_start_addr = NULL; 1374 __le32 *ti_cbuff_start_addr = NULL; 1375 struct ext_filesystem *fs = get_fs(); 1376 if (*total_remaining_blocks != 0) { 1377 /* triple indirect grand parent block connecting to inode */ 1378 ti_gp_blockno = ext4fs_get_new_blk_no(); 1379 if (ti_gp_blockno == -1) { 1380 printf("no block left to assign\n"); 1381 return; 1382 } 1383 ti_gp_buff = zalloc(fs->blksz); 1384 if (!ti_gp_buff) 1385 return; 1386 1387 ti_gp_buff_start_addr = ti_gp_buff; 1388 (*no_blks_reqd)++; 1389 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1390 *total_remaining_blocks); 1391 1392 /* for each 4 byte grand parent entry create one more block */ 1393 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1394 ti_parent_blockno = ext4fs_get_new_blk_no(); 1395 if (ti_parent_blockno == -1) { 1396 printf("no block left to assign\n"); 1397 goto fail; 1398 } 1399 ti_parent_buff = zalloc(fs->blksz); 1400 if (!ti_parent_buff) 1401 goto fail; 1402 1403 ti_pbuff_start_addr = ti_parent_buff; 1404 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1405 ti_gp_buff++; 1406 (*no_blks_reqd)++; 1407 debug("TIPB %ld: %u\n", ti_parent_blockno, 1408 *total_remaining_blocks); 1409 1410 /* for each 4 byte entry parent create one more block */ 1411 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1412 ti_child_blockno = ext4fs_get_new_blk_no(); 1413 if (ti_child_blockno == -1) { 1414 printf("no block left assign\n"); 1415 goto fail1; 1416 } 1417 ti_child_buff = zalloc(fs->blksz); 1418 if (!ti_child_buff) 1419 goto fail1; 1420 1421 ti_cbuff_start_addr = ti_child_buff; 1422 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1423 ti_parent_buff++; 1424 (*no_blks_reqd)++; 1425 debug("TICB %ld: %u\n", ti_parent_blockno, 1426 *total_remaining_blocks); 1427 1428 /* fill actual datablocks for each child */ 1429 for (k = 0; k < (fs->blksz / sizeof(int)); 1430 k++) { 1431 actual_block_no = 1432 ext4fs_get_new_blk_no(); 1433 if (actual_block_no == -1) { 1434 printf("no block left\n"); 1435 free(ti_cbuff_start_addr); 1436 goto fail1; 1437 } 1438 *ti_child_buff = cpu_to_le32(actual_block_no); 1439 debug("TIAB %ld: %u\n", actual_block_no, 1440 *total_remaining_blocks); 1441 1442 ti_child_buff++; 1443 (*total_remaining_blocks)--; 1444 if (*total_remaining_blocks == 0) 1445 break; 1446 } 1447 /* write the child block */ 1448 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1449 (uint64_t)fs->blksz)), 1450 ti_cbuff_start_addr, fs->blksz); 1451 free(ti_cbuff_start_addr); 1452 1453 if (*total_remaining_blocks == 0) 1454 break; 1455 } 1456 /* write the parent block */ 1457 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1458 ti_pbuff_start_addr, fs->blksz); 1459 free(ti_pbuff_start_addr); 1460 1461 if (*total_remaining_blocks == 0) 1462 break; 1463 } 1464 /* write the grand parent block */ 1465 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1466 ti_gp_buff_start_addr, fs->blksz); 1467 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1468 free(ti_gp_buff_start_addr); 1469 return; 1470 } 1471 fail1: 1472 free(ti_pbuff_start_addr); 1473 fail: 1474 free(ti_gp_buff_start_addr); 1475 } 1476 1477 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1478 unsigned int total_remaining_blocks, 1479 unsigned int *total_no_of_block) 1480 { 1481 short i; 1482 long int direct_blockno; 1483 unsigned int no_blks_reqd = 0; 1484 1485 /* allocation of direct blocks */ 1486 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1487 direct_blockno = ext4fs_get_new_blk_no(); 1488 if (direct_blockno == -1) { 1489 printf("no block left to assign\n"); 1490 return; 1491 } 1492 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1493 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1494 1495 total_remaining_blocks--; 1496 } 1497 1498 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1499 &no_blks_reqd); 1500 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1501 &no_blks_reqd); 1502 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1503 &no_blks_reqd); 1504 *total_no_of_block += no_blks_reqd; 1505 } 1506 1507 #endif 1508 1509 static struct ext4_extent_header *ext4fs_get_extent_block 1510 (struct ext2_data *data, char *buf, 1511 struct ext4_extent_header *ext_block, 1512 uint32_t fileblock, int log2_blksz) 1513 { 1514 struct ext4_extent_idx *index; 1515 unsigned long long block; 1516 int blksz = EXT2_BLOCK_SIZE(data); 1517 int i; 1518 1519 while (1) { 1520 index = (struct ext4_extent_idx *)(ext_block + 1); 1521 1522 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1523 return NULL; 1524 1525 if (ext_block->eh_depth == 0) 1526 return ext_block; 1527 i = -1; 1528 do { 1529 i++; 1530 if (i >= le16_to_cpu(ext_block->eh_entries)) 1531 break; 1532 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1533 1534 if (--i < 0) 1535 return NULL; 1536 1537 block = le16_to_cpu(index[i].ei_leaf_hi); 1538 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1539 1540 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1541 buf)) 1542 ext_block = (struct ext4_extent_header *)buf; 1543 else 1544 return NULL; 1545 } 1546 } 1547 1548 static int ext4fs_blockgroup 1549 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1550 { 1551 long int blkno; 1552 unsigned int blkoff, desc_per_blk; 1553 int log2blksz = get_fs()->dev_desc->log2blksz; 1554 int desc_size = get_fs()->gdsize; 1555 1556 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1557 1558 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1559 group / desc_per_blk; 1560 blkoff = (group % desc_per_blk) * desc_size; 1561 1562 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1563 group, blkno, blkoff); 1564 1565 return ext4fs_devread((lbaint_t)blkno << 1566 (LOG2_BLOCK_SIZE(data) - log2blksz), 1567 blkoff, desc_size, (char *)blkgrp); 1568 } 1569 1570 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1571 { 1572 struct ext2_block_group blkgrp; 1573 struct ext2_sblock *sblock = &data->sblock; 1574 struct ext_filesystem *fs = get_fs(); 1575 int log2blksz = get_fs()->dev_desc->log2blksz; 1576 int inodes_per_block, status; 1577 long int blkno; 1578 unsigned int blkoff; 1579 1580 /* It is easier to calculate if the first inode is 0. */ 1581 ino--; 1582 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1583 (sblock->inodes_per_group), &blkgrp); 1584 if (status == 0) 1585 return 0; 1586 1587 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1588 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1589 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1590 blkoff = (ino % inodes_per_block) * fs->inodesz; 1591 /* Read the inode. */ 1592 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1593 log2blksz), blkoff, 1594 sizeof(struct ext2_inode), (char *)inode); 1595 if (status == 0) 1596 return 0; 1597 1598 return 1; 1599 } 1600 1601 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1602 { 1603 long int blknr; 1604 int blksz; 1605 int log2_blksz; 1606 int status; 1607 long int rblock; 1608 long int perblock_parent; 1609 long int perblock_child; 1610 unsigned long long start; 1611 /* get the blocksize of the filesystem */ 1612 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1613 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1614 - get_fs()->dev_desc->log2blksz; 1615 1616 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1617 char *buf = zalloc(blksz); 1618 if (!buf) 1619 return -ENOMEM; 1620 struct ext4_extent_header *ext_block; 1621 struct ext4_extent *extent; 1622 int i = -1; 1623 ext_block = 1624 ext4fs_get_extent_block(ext4fs_root, buf, 1625 (struct ext4_extent_header *) 1626 inode->b.blocks.dir_blocks, 1627 fileblock, log2_blksz); 1628 if (!ext_block) { 1629 printf("invalid extent block\n"); 1630 free(buf); 1631 return -EINVAL; 1632 } 1633 1634 extent = (struct ext4_extent *)(ext_block + 1); 1635 1636 do { 1637 i++; 1638 if (i >= le16_to_cpu(ext_block->eh_entries)) 1639 break; 1640 } while (fileblock >= le32_to_cpu(extent[i].ee_block)); 1641 if (--i >= 0) { 1642 fileblock -= le32_to_cpu(extent[i].ee_block); 1643 if (fileblock >= le16_to_cpu(extent[i].ee_len)) { 1644 free(buf); 1645 return 0; 1646 } 1647 1648 start = le16_to_cpu(extent[i].ee_start_hi); 1649 start = (start << 32) + 1650 le32_to_cpu(extent[i].ee_start_lo); 1651 free(buf); 1652 return fileblock + start; 1653 } 1654 1655 printf("Extent Error\n"); 1656 free(buf); 1657 return -1; 1658 } 1659 1660 /* Direct blocks. */ 1661 if (fileblock < INDIRECT_BLOCKS) 1662 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1663 1664 /* Indirect. */ 1665 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1666 if (ext4fs_indir1_block == NULL) { 1667 ext4fs_indir1_block = zalloc(blksz); 1668 if (ext4fs_indir1_block == NULL) { 1669 printf("** SI ext2fs read block (indir 1)" 1670 "malloc failed. **\n"); 1671 return -1; 1672 } 1673 ext4fs_indir1_size = blksz; 1674 ext4fs_indir1_blkno = -1; 1675 } 1676 if (blksz != ext4fs_indir1_size) { 1677 free(ext4fs_indir1_block); 1678 ext4fs_indir1_block = NULL; 1679 ext4fs_indir1_size = 0; 1680 ext4fs_indir1_blkno = -1; 1681 ext4fs_indir1_block = zalloc(blksz); 1682 if (ext4fs_indir1_block == NULL) { 1683 printf("** SI ext2fs read block (indir 1):" 1684 "malloc failed. **\n"); 1685 return -1; 1686 } 1687 ext4fs_indir1_size = blksz; 1688 } 1689 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1690 log2_blksz) != ext4fs_indir1_blkno) { 1691 status = 1692 ext4fs_devread((lbaint_t)le32_to_cpu 1693 (inode->b.blocks. 1694 indir_block) << log2_blksz, 0, 1695 blksz, (char *)ext4fs_indir1_block); 1696 if (status == 0) { 1697 printf("** SI ext2fs read block (indir 1)" 1698 "failed. **\n"); 1699 return -1; 1700 } 1701 ext4fs_indir1_blkno = 1702 le32_to_cpu(inode->b.blocks. 1703 indir_block) << log2_blksz; 1704 } 1705 blknr = le32_to_cpu(ext4fs_indir1_block 1706 [fileblock - INDIRECT_BLOCKS]); 1707 } 1708 /* Double indirect. */ 1709 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1710 (blksz / 4 + 1)))) { 1711 1712 long int perblock = blksz / 4; 1713 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1714 1715 if (ext4fs_indir1_block == NULL) { 1716 ext4fs_indir1_block = zalloc(blksz); 1717 if (ext4fs_indir1_block == NULL) { 1718 printf("** DI ext2fs read block (indir 2 1)" 1719 "malloc failed. **\n"); 1720 return -1; 1721 } 1722 ext4fs_indir1_size = blksz; 1723 ext4fs_indir1_blkno = -1; 1724 } 1725 if (blksz != ext4fs_indir1_size) { 1726 free(ext4fs_indir1_block); 1727 ext4fs_indir1_block = NULL; 1728 ext4fs_indir1_size = 0; 1729 ext4fs_indir1_blkno = -1; 1730 ext4fs_indir1_block = zalloc(blksz); 1731 if (ext4fs_indir1_block == NULL) { 1732 printf("** DI ext2fs read block (indir 2 1)" 1733 "malloc failed. **\n"); 1734 return -1; 1735 } 1736 ext4fs_indir1_size = blksz; 1737 } 1738 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1739 log2_blksz) != ext4fs_indir1_blkno) { 1740 status = 1741 ext4fs_devread((lbaint_t)le32_to_cpu 1742 (inode->b.blocks. 1743 double_indir_block) << log2_blksz, 1744 0, blksz, 1745 (char *)ext4fs_indir1_block); 1746 if (status == 0) { 1747 printf("** DI ext2fs read block (indir 2 1)" 1748 "failed. **\n"); 1749 return -1; 1750 } 1751 ext4fs_indir1_blkno = 1752 le32_to_cpu(inode->b.blocks.double_indir_block) << 1753 log2_blksz; 1754 } 1755 1756 if (ext4fs_indir2_block == NULL) { 1757 ext4fs_indir2_block = zalloc(blksz); 1758 if (ext4fs_indir2_block == NULL) { 1759 printf("** DI ext2fs read block (indir 2 2)" 1760 "malloc failed. **\n"); 1761 return -1; 1762 } 1763 ext4fs_indir2_size = blksz; 1764 ext4fs_indir2_blkno = -1; 1765 } 1766 if (blksz != ext4fs_indir2_size) { 1767 free(ext4fs_indir2_block); 1768 ext4fs_indir2_block = NULL; 1769 ext4fs_indir2_size = 0; 1770 ext4fs_indir2_blkno = -1; 1771 ext4fs_indir2_block = zalloc(blksz); 1772 if (ext4fs_indir2_block == NULL) { 1773 printf("** DI ext2fs read block (indir 2 2)" 1774 "malloc failed. **\n"); 1775 return -1; 1776 } 1777 ext4fs_indir2_size = blksz; 1778 } 1779 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1780 log2_blksz) != ext4fs_indir2_blkno) { 1781 status = ext4fs_devread((lbaint_t)le32_to_cpu 1782 (ext4fs_indir1_block 1783 [rblock / 1784 perblock]) << log2_blksz, 0, 1785 blksz, 1786 (char *)ext4fs_indir2_block); 1787 if (status == 0) { 1788 printf("** DI ext2fs read block (indir 2 2)" 1789 "failed. **\n"); 1790 return -1; 1791 } 1792 ext4fs_indir2_blkno = 1793 le32_to_cpu(ext4fs_indir1_block[rblock 1794 / 1795 perblock]) << 1796 log2_blksz; 1797 } 1798 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1799 } 1800 /* Tripple indirect. */ 1801 else { 1802 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1803 (blksz / 4 * blksz / 4)); 1804 perblock_child = blksz / 4; 1805 perblock_parent = ((blksz / 4) * (blksz / 4)); 1806 1807 if (ext4fs_indir1_block == NULL) { 1808 ext4fs_indir1_block = zalloc(blksz); 1809 if (ext4fs_indir1_block == NULL) { 1810 printf("** TI ext2fs read block (indir 2 1)" 1811 "malloc failed. **\n"); 1812 return -1; 1813 } 1814 ext4fs_indir1_size = blksz; 1815 ext4fs_indir1_blkno = -1; 1816 } 1817 if (blksz != ext4fs_indir1_size) { 1818 free(ext4fs_indir1_block); 1819 ext4fs_indir1_block = NULL; 1820 ext4fs_indir1_size = 0; 1821 ext4fs_indir1_blkno = -1; 1822 ext4fs_indir1_block = zalloc(blksz); 1823 if (ext4fs_indir1_block == NULL) { 1824 printf("** TI ext2fs read block (indir 2 1)" 1825 "malloc failed. **\n"); 1826 return -1; 1827 } 1828 ext4fs_indir1_size = blksz; 1829 } 1830 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1831 log2_blksz) != ext4fs_indir1_blkno) { 1832 status = ext4fs_devread 1833 ((lbaint_t) 1834 le32_to_cpu(inode->b.blocks.triple_indir_block) 1835 << log2_blksz, 0, blksz, 1836 (char *)ext4fs_indir1_block); 1837 if (status == 0) { 1838 printf("** TI ext2fs read block (indir 2 1)" 1839 "failed. **\n"); 1840 return -1; 1841 } 1842 ext4fs_indir1_blkno = 1843 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1844 log2_blksz; 1845 } 1846 1847 if (ext4fs_indir2_block == NULL) { 1848 ext4fs_indir2_block = zalloc(blksz); 1849 if (ext4fs_indir2_block == NULL) { 1850 printf("** TI ext2fs read block (indir 2 2)" 1851 "malloc failed. **\n"); 1852 return -1; 1853 } 1854 ext4fs_indir2_size = blksz; 1855 ext4fs_indir2_blkno = -1; 1856 } 1857 if (blksz != ext4fs_indir2_size) { 1858 free(ext4fs_indir2_block); 1859 ext4fs_indir2_block = NULL; 1860 ext4fs_indir2_size = 0; 1861 ext4fs_indir2_blkno = -1; 1862 ext4fs_indir2_block = zalloc(blksz); 1863 if (ext4fs_indir2_block == NULL) { 1864 printf("** TI ext2fs read block (indir 2 2)" 1865 "malloc failed. **\n"); 1866 return -1; 1867 } 1868 ext4fs_indir2_size = blksz; 1869 } 1870 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1871 perblock_parent]) << 1872 log2_blksz) 1873 != ext4fs_indir2_blkno) { 1874 status = ext4fs_devread((lbaint_t)le32_to_cpu 1875 (ext4fs_indir1_block 1876 [rblock / 1877 perblock_parent]) << 1878 log2_blksz, 0, blksz, 1879 (char *)ext4fs_indir2_block); 1880 if (status == 0) { 1881 printf("** TI ext2fs read block (indir 2 2)" 1882 "failed. **\n"); 1883 return -1; 1884 } 1885 ext4fs_indir2_blkno = 1886 le32_to_cpu(ext4fs_indir1_block[rblock / 1887 perblock_parent]) 1888 << log2_blksz; 1889 } 1890 1891 if (ext4fs_indir3_block == NULL) { 1892 ext4fs_indir3_block = zalloc(blksz); 1893 if (ext4fs_indir3_block == NULL) { 1894 printf("** TI ext2fs read block (indir 2 2)" 1895 "malloc failed. **\n"); 1896 return -1; 1897 } 1898 ext4fs_indir3_size = blksz; 1899 ext4fs_indir3_blkno = -1; 1900 } 1901 if (blksz != ext4fs_indir3_size) { 1902 free(ext4fs_indir3_block); 1903 ext4fs_indir3_block = NULL; 1904 ext4fs_indir3_size = 0; 1905 ext4fs_indir3_blkno = -1; 1906 ext4fs_indir3_block = zalloc(blksz); 1907 if (ext4fs_indir3_block == NULL) { 1908 printf("** TI ext2fs read block (indir 2 2)" 1909 "malloc failed. **\n"); 1910 return -1; 1911 } 1912 ext4fs_indir3_size = blksz; 1913 } 1914 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1915 / 1916 perblock_child]) << 1917 log2_blksz) != ext4fs_indir3_blkno) { 1918 status = 1919 ext4fs_devread((lbaint_t)le32_to_cpu 1920 (ext4fs_indir2_block 1921 [(rblock / perblock_child) 1922 % (blksz / 4)]) << log2_blksz, 0, 1923 blksz, (char *)ext4fs_indir3_block); 1924 if (status == 0) { 1925 printf("** TI ext2fs read block (indir 2 2)" 1926 "failed. **\n"); 1927 return -1; 1928 } 1929 ext4fs_indir3_blkno = 1930 le32_to_cpu(ext4fs_indir2_block[(rblock / 1931 perblock_child) % 1932 (blksz / 1933 4)]) << 1934 log2_blksz; 1935 } 1936 1937 blknr = le32_to_cpu(ext4fs_indir3_block 1938 [rblock % perblock_child]); 1939 } 1940 debug("read_allocated_block %ld\n", blknr); 1941 1942 return blknr; 1943 } 1944 1945 /** 1946 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1947 * global pointers 1948 * 1949 * This function assures that for a file with the same name but different size 1950 * the sequential store on the ext4 filesystem will be correct. 1951 * 1952 * In this function the global data, responsible for internal representation 1953 * of the ext4 data are initialized to the reset state. Without this, during 1954 * replacement of the smaller file with the bigger truncation of new file was 1955 * performed. 1956 */ 1957 void ext4fs_reinit_global(void) 1958 { 1959 if (ext4fs_indir1_block != NULL) { 1960 free(ext4fs_indir1_block); 1961 ext4fs_indir1_block = NULL; 1962 ext4fs_indir1_size = 0; 1963 ext4fs_indir1_blkno = -1; 1964 } 1965 if (ext4fs_indir2_block != NULL) { 1966 free(ext4fs_indir2_block); 1967 ext4fs_indir2_block = NULL; 1968 ext4fs_indir2_size = 0; 1969 ext4fs_indir2_blkno = -1; 1970 } 1971 if (ext4fs_indir3_block != NULL) { 1972 free(ext4fs_indir3_block); 1973 ext4fs_indir3_block = NULL; 1974 ext4fs_indir3_size = 0; 1975 ext4fs_indir3_blkno = -1; 1976 } 1977 } 1978 void ext4fs_close(void) 1979 { 1980 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1981 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1982 ext4fs_file = NULL; 1983 } 1984 if (ext4fs_root != NULL) { 1985 free(ext4fs_root); 1986 ext4fs_root = NULL; 1987 } 1988 1989 ext4fs_reinit_global(); 1990 } 1991 1992 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 1993 struct ext2fs_node **fnode, int *ftype) 1994 { 1995 unsigned int fpos = 0; 1996 int status; 1997 loff_t actread; 1998 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 1999 2000 #ifdef DEBUG 2001 if (name != NULL) 2002 printf("Iterate dir %s\n", name); 2003 #endif /* of DEBUG */ 2004 if (!diro->inode_read) { 2005 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2006 if (status == 0) 2007 return 0; 2008 } 2009 /* Search the file. */ 2010 while (fpos < le32_to_cpu(diro->inode.size)) { 2011 struct ext2_dirent dirent; 2012 2013 status = ext4fs_read_file(diro, fpos, 2014 sizeof(struct ext2_dirent), 2015 (char *)&dirent, &actread); 2016 if (status < 0) 2017 return 0; 2018 2019 if (dirent.direntlen == 0) { 2020 printf("Failed to iterate over directory %s\n", name); 2021 return 0; 2022 } 2023 2024 if (dirent.namelen != 0) { 2025 char filename[dirent.namelen + 1]; 2026 struct ext2fs_node *fdiro; 2027 int type = FILETYPE_UNKNOWN; 2028 2029 status = ext4fs_read_file(diro, 2030 fpos + 2031 sizeof(struct ext2_dirent), 2032 dirent.namelen, filename, 2033 &actread); 2034 if (status < 0) 2035 return 0; 2036 2037 fdiro = zalloc(sizeof(struct ext2fs_node)); 2038 if (!fdiro) 2039 return 0; 2040 2041 fdiro->data = diro->data; 2042 fdiro->ino = le32_to_cpu(dirent.inode); 2043 2044 filename[dirent.namelen] = '\0'; 2045 2046 if (dirent.filetype != FILETYPE_UNKNOWN) { 2047 fdiro->inode_read = 0; 2048 2049 if (dirent.filetype == FILETYPE_DIRECTORY) 2050 type = FILETYPE_DIRECTORY; 2051 else if (dirent.filetype == FILETYPE_SYMLINK) 2052 type = FILETYPE_SYMLINK; 2053 else if (dirent.filetype == FILETYPE_REG) 2054 type = FILETYPE_REG; 2055 } else { 2056 status = ext4fs_read_inode(diro->data, 2057 le32_to_cpu 2058 (dirent.inode), 2059 &fdiro->inode); 2060 if (status == 0) { 2061 free(fdiro); 2062 return 0; 2063 } 2064 fdiro->inode_read = 1; 2065 2066 if ((le16_to_cpu(fdiro->inode.mode) & 2067 FILETYPE_INO_MASK) == 2068 FILETYPE_INO_DIRECTORY) { 2069 type = FILETYPE_DIRECTORY; 2070 } else if ((le16_to_cpu(fdiro->inode.mode) 2071 & FILETYPE_INO_MASK) == 2072 FILETYPE_INO_SYMLINK) { 2073 type = FILETYPE_SYMLINK; 2074 } else if ((le16_to_cpu(fdiro->inode.mode) 2075 & FILETYPE_INO_MASK) == 2076 FILETYPE_INO_REG) { 2077 type = FILETYPE_REG; 2078 } 2079 } 2080 #ifdef DEBUG 2081 printf("iterate >%s<\n", filename); 2082 #endif /* of DEBUG */ 2083 if ((name != NULL) && (fnode != NULL) 2084 && (ftype != NULL)) { 2085 if (strcmp(filename, name) == 0) { 2086 *ftype = type; 2087 *fnode = fdiro; 2088 return 1; 2089 } 2090 } else { 2091 if (fdiro->inode_read == 0) { 2092 status = ext4fs_read_inode(diro->data, 2093 le32_to_cpu( 2094 dirent.inode), 2095 &fdiro->inode); 2096 if (status == 0) { 2097 free(fdiro); 2098 return 0; 2099 } 2100 fdiro->inode_read = 1; 2101 } 2102 switch (type) { 2103 case FILETYPE_DIRECTORY: 2104 printf("<DIR> "); 2105 break; 2106 case FILETYPE_SYMLINK: 2107 printf("<SYM> "); 2108 break; 2109 case FILETYPE_REG: 2110 printf(" "); 2111 break; 2112 default: 2113 printf("< ? > "); 2114 break; 2115 } 2116 printf("%10u %s\n", 2117 le32_to_cpu(fdiro->inode.size), 2118 filename); 2119 } 2120 free(fdiro); 2121 } 2122 fpos += le16_to_cpu(dirent.direntlen); 2123 } 2124 return 0; 2125 } 2126 2127 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2128 { 2129 char *symlink; 2130 struct ext2fs_node *diro = node; 2131 int status; 2132 loff_t actread; 2133 2134 if (!diro->inode_read) { 2135 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2136 if (status == 0) 2137 return NULL; 2138 } 2139 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2140 if (!symlink) 2141 return NULL; 2142 2143 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2144 strncpy(symlink, diro->inode.b.symlink, 2145 le32_to_cpu(diro->inode.size)); 2146 } else { 2147 status = ext4fs_read_file(diro, 0, 2148 le32_to_cpu(diro->inode.size), 2149 symlink, &actread); 2150 if ((status < 0) || (actread == 0)) { 2151 free(symlink); 2152 return NULL; 2153 } 2154 } 2155 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2156 return symlink; 2157 } 2158 2159 static int ext4fs_find_file1(const char *currpath, 2160 struct ext2fs_node *currroot, 2161 struct ext2fs_node **currfound, int *foundtype) 2162 { 2163 char fpath[strlen(currpath) + 1]; 2164 char *name = fpath; 2165 char *next; 2166 int status; 2167 int type = FILETYPE_DIRECTORY; 2168 struct ext2fs_node *currnode = currroot; 2169 struct ext2fs_node *oldnode = currroot; 2170 2171 strncpy(fpath, currpath, strlen(currpath) + 1); 2172 2173 /* Remove all leading slashes. */ 2174 while (*name == '/') 2175 name++; 2176 2177 if (!*name) { 2178 *currfound = currnode; 2179 return 1; 2180 } 2181 2182 for (;;) { 2183 int found; 2184 2185 /* Extract the actual part from the pathname. */ 2186 next = strchr(name, '/'); 2187 if (next) { 2188 /* Remove all leading slashes. */ 2189 while (*next == '/') 2190 *(next++) = '\0'; 2191 } 2192 2193 if (type != FILETYPE_DIRECTORY) { 2194 ext4fs_free_node(currnode, currroot); 2195 return 0; 2196 } 2197 2198 oldnode = currnode; 2199 2200 /* Iterate over the directory. */ 2201 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2202 if (found == 0) 2203 return 0; 2204 2205 if (found == -1) 2206 break; 2207 2208 /* Read in the symlink and follow it. */ 2209 if (type == FILETYPE_SYMLINK) { 2210 char *symlink; 2211 2212 /* Test if the symlink does not loop. */ 2213 if (++symlinknest == 8) { 2214 ext4fs_free_node(currnode, currroot); 2215 ext4fs_free_node(oldnode, currroot); 2216 return 0; 2217 } 2218 2219 symlink = ext4fs_read_symlink(currnode); 2220 ext4fs_free_node(currnode, currroot); 2221 2222 if (!symlink) { 2223 ext4fs_free_node(oldnode, currroot); 2224 return 0; 2225 } 2226 2227 debug("Got symlink >%s<\n", symlink); 2228 2229 if (symlink[0] == '/') { 2230 ext4fs_free_node(oldnode, currroot); 2231 oldnode = &ext4fs_root->diropen; 2232 } 2233 2234 /* Lookup the node the symlink points to. */ 2235 status = ext4fs_find_file1(symlink, oldnode, 2236 &currnode, &type); 2237 2238 free(symlink); 2239 2240 if (status == 0) { 2241 ext4fs_free_node(oldnode, currroot); 2242 return 0; 2243 } 2244 } 2245 2246 ext4fs_free_node(oldnode, currroot); 2247 2248 /* Found the node! */ 2249 if (!next || *next == '\0') { 2250 *currfound = currnode; 2251 *foundtype = type; 2252 return 1; 2253 } 2254 name = next; 2255 } 2256 return -1; 2257 } 2258 2259 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2260 struct ext2fs_node **foundnode, int expecttype) 2261 { 2262 int status; 2263 int foundtype = FILETYPE_DIRECTORY; 2264 2265 symlinknest = 0; 2266 if (!path) 2267 return 0; 2268 2269 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2270 if (status == 0) 2271 return 0; 2272 2273 /* Check if the node that was found was of the expected type. */ 2274 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2275 return 0; 2276 else if ((expecttype == FILETYPE_DIRECTORY) 2277 && (foundtype != expecttype)) 2278 return 0; 2279 2280 return 1; 2281 } 2282 2283 int ext4fs_open(const char *filename, loff_t *len) 2284 { 2285 struct ext2fs_node *fdiro = NULL; 2286 int status; 2287 2288 if (ext4fs_root == NULL) 2289 return -1; 2290 2291 ext4fs_file = NULL; 2292 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2293 FILETYPE_REG); 2294 if (status == 0) 2295 goto fail; 2296 2297 if (!fdiro->inode_read) { 2298 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2299 &fdiro->inode); 2300 if (status == 0) 2301 goto fail; 2302 } 2303 *len = le32_to_cpu(fdiro->inode.size); 2304 ext4fs_file = fdiro; 2305 2306 return 0; 2307 fail: 2308 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2309 2310 return -1; 2311 } 2312 2313 int ext4fs_mount(unsigned part_length) 2314 { 2315 struct ext2_data *data; 2316 int status; 2317 struct ext_filesystem *fs = get_fs(); 2318 data = zalloc(SUPERBLOCK_SIZE); 2319 if (!data) 2320 return 0; 2321 2322 /* Read the superblock. */ 2323 status = ext4_read_superblock((char *)&data->sblock); 2324 2325 if (status == 0) 2326 goto fail; 2327 2328 /* Make sure this is an ext2 filesystem. */ 2329 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2330 goto fail; 2331 2332 2333 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2334 fs->inodesz = 128; 2335 } else { 2336 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2337 __le32_to_cpu(data->sblock.feature_compatibility), 2338 __le32_to_cpu(data->sblock.feature_incompat), 2339 __le32_to_cpu(data->sblock.feature_ro_compat)); 2340 2341 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2342 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2343 EXT4_FEATURE_INCOMPAT_64BIT ? 2344 le16_to_cpu(data->sblock.descriptor_size) : 32; 2345 } 2346 2347 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2348 le32_to_cpu(data->sblock.revision_level), 2349 fs->inodesz, fs->gdsize); 2350 2351 data->diropen.data = data; 2352 data->diropen.ino = 2; 2353 data->diropen.inode_read = 1; 2354 data->inode = &data->diropen.inode; 2355 2356 status = ext4fs_read_inode(data, 2, data->inode); 2357 if (status == 0) 2358 goto fail; 2359 2360 ext4fs_root = data; 2361 2362 return 1; 2363 fail: 2364 printf("Failed to mount ext2 filesystem...\n"); 2365 free(data); 2366 ext4fs_root = NULL; 2367 2368 return 0; 2369 } 2370