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 templength = 0; 858 int status, inodeno; 859 int found = 0; 860 int offset; 861 char *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 block_buffer = zalloc(fs->blksz); 869 if (!block_buffer) 870 return -ENOMEM; 871 872 /* read the directory block */ 873 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 874 fs->blksz, block_buffer); 875 if (status == 0) 876 goto fail; 877 878 if (ext4fs_log_journal(block_buffer, blknr)) 879 goto fail; 880 dir = (struct ext2_dirent *)block_buffer; 881 ptr = (char *)dir; 882 offset = 0; 883 while (le16_to_cpu(dir->direntlen) >= 0) { 884 /* 885 * blocksize-offset because last 886 * directory length i.e., *dir->direntlen 887 * is free availble space in the block that 888 * means it is a last entry of directory entry 889 */ 890 if (dir->inode && (strlen(filename) == dir->namelen) && 891 (strncmp(ptr + sizeof(struct ext2_dirent), 892 filename, dir->namelen) == 0)) { 893 printf("file found, deleting\n"); 894 inodeno = le32_to_cpu(dir->inode); 895 if (previous_dir) { 896 uint16_t new_len; 897 new_len = le16_to_cpu(previous_dir->direntlen); 898 new_len += le16_to_cpu(dir->direntlen); 899 previous_dir->direntlen = cpu_to_le16(new_len); 900 } else { 901 dir->inode = 0; 902 } 903 found = 1; 904 break; 905 } 906 907 if (fs->blksz - offset == le16_to_cpu(dir->direntlen)) 908 break; 909 910 /* traversing the each directory entry */ 911 templength = le16_to_cpu(dir->direntlen); 912 offset = offset + templength; 913 previous_dir = dir; 914 dir = (struct ext2_dirent *)((char *)dir + templength); 915 ptr = (char *)dir; 916 } 917 918 919 if (found == 1) { 920 if (ext4fs_put_metadata(block_buffer, blknr)) 921 goto fail; 922 ret = inodeno; 923 } 924 fail: 925 free(block_buffer); 926 927 return ret; 928 } 929 930 int ext4fs_filename_unlink(char *filename) 931 { 932 int blk_idx; 933 long int blknr = -1; 934 int inodeno = -1; 935 uint32_t directory_blocks; 936 937 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 938 LOG2_BLOCK_SIZE(ext4fs_root); 939 940 /* read the block no allocated to a file */ 941 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 942 blknr = read_allocated_block(g_parent_inode, blk_idx); 943 if (blknr <= 0) 944 break; 945 inodeno = unlink_filename(filename, blknr); 946 if (inodeno != -1) 947 return inodeno; 948 } 949 950 return -1; 951 } 952 953 uint32_t ext4fs_get_new_blk_no(void) 954 { 955 short i; 956 short status; 957 int remainder; 958 unsigned int bg_idx; 959 static int prev_bg_bitmap_index = -1; 960 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 961 struct ext_filesystem *fs = get_fs(); 962 char *journal_buffer = zalloc(fs->blksz); 963 char *zero_buffer = zalloc(fs->blksz); 964 if (!journal_buffer || !zero_buffer) 965 goto fail; 966 967 if (fs->first_pass_bbmap == 0) { 968 for (i = 0; i < fs->no_blkgrp; i++) { 969 struct ext2_block_group *bgd = NULL; 970 bgd = ext4fs_get_group_descriptor(fs, i); 971 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 972 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 973 uint64_t b_bitmap_blk = 974 ext4fs_bg_get_block_id(bgd, fs); 975 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 976 memcpy(fs->blk_bmaps[i], zero_buffer, 977 fs->blksz); 978 put_ext4(b_bitmap_blk * fs->blksz, 979 fs->blk_bmaps[i], fs->blksz); 980 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 981 ext4fs_bg_set_flags(bgd, bg_flags); 982 } 983 fs->curr_blkno = 984 _get_new_blk_no(fs->blk_bmaps[i]); 985 if (fs->curr_blkno == -1) 986 /* block bitmap is completely filled */ 987 continue; 988 fs->curr_blkno = fs->curr_blkno + 989 (i * fs->blksz * 8); 990 fs->first_pass_bbmap++; 991 ext4fs_bg_free_blocks_dec(bgd, fs); 992 ext4fs_sb_free_blocks_dec(fs->sb); 993 status = ext4fs_devread(b_bitmap_blk * 994 fs->sect_perblk, 995 0, fs->blksz, 996 journal_buffer); 997 if (status == 0) 998 goto fail; 999 if (ext4fs_log_journal(journal_buffer, 1000 b_bitmap_blk)) 1001 goto fail; 1002 goto success; 1003 } else { 1004 debug("no space left on block group %d\n", i); 1005 } 1006 } 1007 1008 goto fail; 1009 } else { 1010 fs->curr_blkno++; 1011 restart: 1012 /* get the blockbitmap index respective to blockno */ 1013 bg_idx = fs->curr_blkno / blk_per_grp; 1014 if (fs->blksz == 1024) { 1015 remainder = fs->curr_blkno % blk_per_grp; 1016 if (!remainder) 1017 bg_idx--; 1018 } 1019 1020 /* 1021 * To skip completely filled block group bitmaps 1022 * Optimize the block allocation 1023 */ 1024 if (bg_idx >= fs->no_blkgrp) 1025 goto fail; 1026 1027 struct ext2_block_group *bgd = NULL; 1028 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1029 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1030 debug("block group %u is full. Skipping\n", bg_idx); 1031 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1032 if (fs->blksz == 1024) 1033 fs->curr_blkno += 1; 1034 goto restart; 1035 } 1036 1037 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1038 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1039 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1040 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1041 put_ext4(b_bitmap_blk * fs->blksz, 1042 zero_buffer, fs->blksz); 1043 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1044 ext4fs_bg_set_flags(bgd, bg_flags); 1045 } 1046 1047 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1048 bg_idx) != 0) { 1049 debug("going for restart for the block no %ld %u\n", 1050 fs->curr_blkno, bg_idx); 1051 fs->curr_blkno++; 1052 goto restart; 1053 } 1054 1055 /* journal backup */ 1056 if (prev_bg_bitmap_index != bg_idx) { 1057 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1058 0, fs->blksz, journal_buffer); 1059 if (status == 0) 1060 goto fail; 1061 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1062 goto fail; 1063 1064 prev_bg_bitmap_index = bg_idx; 1065 } 1066 ext4fs_bg_free_blocks_dec(bgd, fs); 1067 ext4fs_sb_free_blocks_dec(fs->sb); 1068 goto success; 1069 } 1070 success: 1071 free(journal_buffer); 1072 free(zero_buffer); 1073 1074 return fs->curr_blkno; 1075 fail: 1076 free(journal_buffer); 1077 free(zero_buffer); 1078 1079 return -1; 1080 } 1081 1082 int ext4fs_get_new_inode_no(void) 1083 { 1084 short i; 1085 short status; 1086 unsigned int ibmap_idx; 1087 static int prev_inode_bitmap_index = -1; 1088 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1089 struct ext_filesystem *fs = get_fs(); 1090 char *journal_buffer = zalloc(fs->blksz); 1091 char *zero_buffer = zalloc(fs->blksz); 1092 if (!journal_buffer || !zero_buffer) 1093 goto fail; 1094 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1095 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1096 1097 if (fs->first_pass_ibmap == 0) { 1098 for (i = 0; i < fs->no_blkgrp; i++) { 1099 uint32_t free_inodes; 1100 struct ext2_block_group *bgd = NULL; 1101 bgd = ext4fs_get_group_descriptor(fs, i); 1102 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1103 if (free_inodes) { 1104 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1105 uint64_t i_bitmap_blk = 1106 ext4fs_bg_get_inode_id(bgd, fs); 1107 if (has_gdt_chksum) 1108 bgd->bg_itable_unused = free_inodes; 1109 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1110 put_ext4(i_bitmap_blk * fs->blksz, 1111 zero_buffer, fs->blksz); 1112 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1113 ext4fs_bg_set_flags(bgd, bg_flags); 1114 memcpy(fs->inode_bmaps[i], 1115 zero_buffer, fs->blksz); 1116 } 1117 fs->curr_inode_no = 1118 _get_new_inode_no(fs->inode_bmaps[i]); 1119 if (fs->curr_inode_no == -1) 1120 /* inode bitmap is completely filled */ 1121 continue; 1122 fs->curr_inode_no = fs->curr_inode_no + 1123 (i * inodes_per_grp); 1124 fs->first_pass_ibmap++; 1125 ext4fs_bg_free_inodes_dec(bgd, fs); 1126 if (has_gdt_chksum) 1127 ext4fs_bg_itable_unused_dec(bgd, fs); 1128 ext4fs_sb_free_inodes_dec(fs->sb); 1129 status = ext4fs_devread(i_bitmap_blk * 1130 fs->sect_perblk, 1131 0, fs->blksz, 1132 journal_buffer); 1133 if (status == 0) 1134 goto fail; 1135 if (ext4fs_log_journal(journal_buffer, 1136 i_bitmap_blk)) 1137 goto fail; 1138 goto success; 1139 } else 1140 debug("no inode left on block group %d\n", i); 1141 } 1142 goto fail; 1143 } else { 1144 restart: 1145 fs->curr_inode_no++; 1146 /* get the blockbitmap index respective to blockno */ 1147 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1148 struct ext2_block_group *bgd = 1149 ext4fs_get_group_descriptor(fs, ibmap_idx); 1150 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1151 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1152 1153 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1154 put_ext4(i_bitmap_blk * fs->blksz, 1155 zero_buffer, fs->blksz); 1156 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1157 ext4fs_bg_set_flags(bgd, bg_flags); 1158 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1159 fs->blksz); 1160 } 1161 1162 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1163 fs->inode_bmaps[ibmap_idx], 1164 ibmap_idx) != 0) { 1165 debug("going for restart for the block no %d %u\n", 1166 fs->curr_inode_no, ibmap_idx); 1167 goto restart; 1168 } 1169 1170 /* journal backup */ 1171 if (prev_inode_bitmap_index != ibmap_idx) { 1172 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1173 0, fs->blksz, journal_buffer); 1174 if (status == 0) 1175 goto fail; 1176 if (ext4fs_log_journal(journal_buffer, 1177 le32_to_cpu(bgd->inode_id))) 1178 goto fail; 1179 prev_inode_bitmap_index = ibmap_idx; 1180 } 1181 ext4fs_bg_free_inodes_dec(bgd, fs); 1182 if (has_gdt_chksum) 1183 bgd->bg_itable_unused = bgd->free_inodes; 1184 ext4fs_sb_free_inodes_dec(fs->sb); 1185 goto success; 1186 } 1187 1188 success: 1189 free(journal_buffer); 1190 free(zero_buffer); 1191 1192 return fs->curr_inode_no; 1193 fail: 1194 free(journal_buffer); 1195 free(zero_buffer); 1196 1197 return -1; 1198 1199 } 1200 1201 1202 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1203 unsigned int *total_remaining_blocks, 1204 unsigned int *no_blks_reqd) 1205 { 1206 short i; 1207 short status; 1208 long int actual_block_no; 1209 long int si_blockno; 1210 /* si :single indirect */ 1211 __le32 *si_buffer = NULL; 1212 __le32 *si_start_addr = NULL; 1213 struct ext_filesystem *fs = get_fs(); 1214 1215 if (*total_remaining_blocks != 0) { 1216 si_buffer = zalloc(fs->blksz); 1217 if (!si_buffer) { 1218 printf("No Memory\n"); 1219 return; 1220 } 1221 si_start_addr = si_buffer; 1222 si_blockno = ext4fs_get_new_blk_no(); 1223 if (si_blockno == -1) { 1224 printf("no block left to assign\n"); 1225 goto fail; 1226 } 1227 (*no_blks_reqd)++; 1228 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1229 1230 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1231 0, fs->blksz, (char *)si_buffer); 1232 memset(si_buffer, '\0', fs->blksz); 1233 if (status == 0) 1234 goto fail; 1235 1236 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1237 actual_block_no = ext4fs_get_new_blk_no(); 1238 if (actual_block_no == -1) { 1239 printf("no block left to assign\n"); 1240 goto fail; 1241 } 1242 *si_buffer = cpu_to_le32(actual_block_no); 1243 debug("SIAB %u: %u\n", *si_buffer, 1244 *total_remaining_blocks); 1245 1246 si_buffer++; 1247 (*total_remaining_blocks)--; 1248 if (*total_remaining_blocks == 0) 1249 break; 1250 } 1251 1252 /* write the block to disk */ 1253 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1254 si_start_addr, fs->blksz); 1255 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1256 } 1257 fail: 1258 free(si_start_addr); 1259 } 1260 1261 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1262 unsigned int *total_remaining_blocks, 1263 unsigned int *no_blks_reqd) 1264 { 1265 short i; 1266 short j; 1267 short status; 1268 long int actual_block_no; 1269 /* di:double indirect */ 1270 long int di_blockno_parent; 1271 long int di_blockno_child; 1272 __le32 *di_parent_buffer = NULL; 1273 __le32 *di_child_buff = NULL; 1274 __le32 *di_block_start_addr = NULL; 1275 __le32 *di_child_buff_start = NULL; 1276 struct ext_filesystem *fs = get_fs(); 1277 1278 if (*total_remaining_blocks != 0) { 1279 /* double indirect parent block connecting to inode */ 1280 di_blockno_parent = ext4fs_get_new_blk_no(); 1281 if (di_blockno_parent == -1) { 1282 printf("no block left to assign\n"); 1283 goto fail; 1284 } 1285 di_parent_buffer = zalloc(fs->blksz); 1286 if (!di_parent_buffer) 1287 goto fail; 1288 1289 di_block_start_addr = di_parent_buffer; 1290 (*no_blks_reqd)++; 1291 debug("DIPB %ld: %u\n", di_blockno_parent, 1292 *total_remaining_blocks); 1293 1294 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1295 fs->sect_perblk, 0, 1296 fs->blksz, (char *)di_parent_buffer); 1297 1298 if (!status) { 1299 printf("%s: Device read error!\n", __func__); 1300 goto fail; 1301 } 1302 memset(di_parent_buffer, '\0', fs->blksz); 1303 1304 /* 1305 * start:for each double indirect parent 1306 * block create one more block 1307 */ 1308 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1309 di_blockno_child = ext4fs_get_new_blk_no(); 1310 if (di_blockno_child == -1) { 1311 printf("no block left to assign\n"); 1312 goto fail; 1313 } 1314 di_child_buff = zalloc(fs->blksz); 1315 if (!di_child_buff) 1316 goto fail; 1317 1318 di_child_buff_start = di_child_buff; 1319 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1320 di_parent_buffer++; 1321 (*no_blks_reqd)++; 1322 debug("DICB %ld: %u\n", di_blockno_child, 1323 *total_remaining_blocks); 1324 1325 status = ext4fs_devread((lbaint_t)di_blockno_child * 1326 fs->sect_perblk, 0, 1327 fs->blksz, 1328 (char *)di_child_buff); 1329 1330 if (!status) { 1331 printf("%s: Device read error!\n", __func__); 1332 goto fail; 1333 } 1334 memset(di_child_buff, '\0', fs->blksz); 1335 /* filling of actual datablocks for each child */ 1336 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1337 actual_block_no = ext4fs_get_new_blk_no(); 1338 if (actual_block_no == -1) { 1339 printf("no block left to assign\n"); 1340 goto fail; 1341 } 1342 *di_child_buff = cpu_to_le32(actual_block_no); 1343 debug("DIAB %ld: %u\n", actual_block_no, 1344 *total_remaining_blocks); 1345 1346 di_child_buff++; 1347 (*total_remaining_blocks)--; 1348 if (*total_remaining_blocks == 0) 1349 break; 1350 } 1351 /* write the block table */ 1352 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1353 di_child_buff_start, fs->blksz); 1354 free(di_child_buff_start); 1355 di_child_buff_start = NULL; 1356 1357 if (*total_remaining_blocks == 0) 1358 break; 1359 } 1360 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1361 di_block_start_addr, fs->blksz); 1362 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1363 } 1364 fail: 1365 free(di_block_start_addr); 1366 } 1367 1368 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1369 unsigned int *total_remaining_blocks, 1370 unsigned int *no_blks_reqd) 1371 { 1372 short i; 1373 short j; 1374 short k; 1375 long int actual_block_no; 1376 /* ti: Triple Indirect */ 1377 long int ti_gp_blockno; 1378 long int ti_parent_blockno; 1379 long int ti_child_blockno; 1380 __le32 *ti_gp_buff = NULL; 1381 __le32 *ti_parent_buff = NULL; 1382 __le32 *ti_child_buff = NULL; 1383 __le32 *ti_gp_buff_start_addr = NULL; 1384 __le32 *ti_pbuff_start_addr = NULL; 1385 __le32 *ti_cbuff_start_addr = NULL; 1386 struct ext_filesystem *fs = get_fs(); 1387 if (*total_remaining_blocks != 0) { 1388 /* triple indirect grand parent block connecting to inode */ 1389 ti_gp_blockno = ext4fs_get_new_blk_no(); 1390 if (ti_gp_blockno == -1) { 1391 printf("no block left to assign\n"); 1392 return; 1393 } 1394 ti_gp_buff = zalloc(fs->blksz); 1395 if (!ti_gp_buff) 1396 return; 1397 1398 ti_gp_buff_start_addr = ti_gp_buff; 1399 (*no_blks_reqd)++; 1400 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1401 *total_remaining_blocks); 1402 1403 /* for each 4 byte grand parent entry create one more block */ 1404 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1405 ti_parent_blockno = ext4fs_get_new_blk_no(); 1406 if (ti_parent_blockno == -1) { 1407 printf("no block left to assign\n"); 1408 goto fail; 1409 } 1410 ti_parent_buff = zalloc(fs->blksz); 1411 if (!ti_parent_buff) 1412 goto fail; 1413 1414 ti_pbuff_start_addr = ti_parent_buff; 1415 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1416 ti_gp_buff++; 1417 (*no_blks_reqd)++; 1418 debug("TIPB %ld: %u\n", ti_parent_blockno, 1419 *total_remaining_blocks); 1420 1421 /* for each 4 byte entry parent create one more block */ 1422 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1423 ti_child_blockno = ext4fs_get_new_blk_no(); 1424 if (ti_child_blockno == -1) { 1425 printf("no block left assign\n"); 1426 goto fail1; 1427 } 1428 ti_child_buff = zalloc(fs->blksz); 1429 if (!ti_child_buff) 1430 goto fail1; 1431 1432 ti_cbuff_start_addr = ti_child_buff; 1433 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1434 ti_parent_buff++; 1435 (*no_blks_reqd)++; 1436 debug("TICB %ld: %u\n", ti_parent_blockno, 1437 *total_remaining_blocks); 1438 1439 /* fill actual datablocks for each child */ 1440 for (k = 0; k < (fs->blksz / sizeof(int)); 1441 k++) { 1442 actual_block_no = 1443 ext4fs_get_new_blk_no(); 1444 if (actual_block_no == -1) { 1445 printf("no block left\n"); 1446 free(ti_cbuff_start_addr); 1447 goto fail1; 1448 } 1449 *ti_child_buff = cpu_to_le32(actual_block_no); 1450 debug("TIAB %ld: %u\n", actual_block_no, 1451 *total_remaining_blocks); 1452 1453 ti_child_buff++; 1454 (*total_remaining_blocks)--; 1455 if (*total_remaining_blocks == 0) 1456 break; 1457 } 1458 /* write the child block */ 1459 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1460 (uint64_t)fs->blksz)), 1461 ti_cbuff_start_addr, fs->blksz); 1462 free(ti_cbuff_start_addr); 1463 1464 if (*total_remaining_blocks == 0) 1465 break; 1466 } 1467 /* write the parent block */ 1468 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1469 ti_pbuff_start_addr, fs->blksz); 1470 free(ti_pbuff_start_addr); 1471 1472 if (*total_remaining_blocks == 0) 1473 break; 1474 } 1475 /* write the grand parent block */ 1476 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1477 ti_gp_buff_start_addr, fs->blksz); 1478 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1479 free(ti_gp_buff_start_addr); 1480 return; 1481 } 1482 fail1: 1483 free(ti_pbuff_start_addr); 1484 fail: 1485 free(ti_gp_buff_start_addr); 1486 } 1487 1488 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1489 unsigned int total_remaining_blocks, 1490 unsigned int *total_no_of_block) 1491 { 1492 short i; 1493 long int direct_blockno; 1494 unsigned int no_blks_reqd = 0; 1495 1496 /* allocation of direct blocks */ 1497 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1498 direct_blockno = ext4fs_get_new_blk_no(); 1499 if (direct_blockno == -1) { 1500 printf("no block left to assign\n"); 1501 return; 1502 } 1503 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1504 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1505 1506 total_remaining_blocks--; 1507 } 1508 1509 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1510 &no_blks_reqd); 1511 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1512 &no_blks_reqd); 1513 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1514 &no_blks_reqd); 1515 *total_no_of_block += no_blks_reqd; 1516 } 1517 1518 #endif 1519 1520 static struct ext4_extent_header *ext4fs_get_extent_block 1521 (struct ext2_data *data, char *buf, 1522 struct ext4_extent_header *ext_block, 1523 uint32_t fileblock, int log2_blksz) 1524 { 1525 struct ext4_extent_idx *index; 1526 unsigned long long block; 1527 int blksz = EXT2_BLOCK_SIZE(data); 1528 int i; 1529 1530 while (1) { 1531 index = (struct ext4_extent_idx *)(ext_block + 1); 1532 1533 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1534 return NULL; 1535 1536 if (ext_block->eh_depth == 0) 1537 return ext_block; 1538 i = -1; 1539 do { 1540 i++; 1541 if (i >= le16_to_cpu(ext_block->eh_entries)) 1542 break; 1543 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1544 1545 if (--i < 0) 1546 return NULL; 1547 1548 block = le16_to_cpu(index[i].ei_leaf_hi); 1549 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1550 1551 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1552 buf)) 1553 ext_block = (struct ext4_extent_header *)buf; 1554 else 1555 return NULL; 1556 } 1557 } 1558 1559 static int ext4fs_blockgroup 1560 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1561 { 1562 long int blkno; 1563 unsigned int blkoff, desc_per_blk; 1564 int log2blksz = get_fs()->dev_desc->log2blksz; 1565 int desc_size = get_fs()->gdsize; 1566 1567 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1568 1569 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1570 group / desc_per_blk; 1571 blkoff = (group % desc_per_blk) * desc_size; 1572 1573 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1574 group, blkno, blkoff); 1575 1576 return ext4fs_devread((lbaint_t)blkno << 1577 (LOG2_BLOCK_SIZE(data) - log2blksz), 1578 blkoff, desc_size, (char *)blkgrp); 1579 } 1580 1581 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1582 { 1583 struct ext2_block_group blkgrp; 1584 struct ext2_sblock *sblock = &data->sblock; 1585 struct ext_filesystem *fs = get_fs(); 1586 int log2blksz = get_fs()->dev_desc->log2blksz; 1587 int inodes_per_block, status; 1588 long int blkno; 1589 unsigned int blkoff; 1590 1591 /* It is easier to calculate if the first inode is 0. */ 1592 ino--; 1593 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1594 (sblock->inodes_per_group), &blkgrp); 1595 if (status == 0) 1596 return 0; 1597 1598 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1599 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1600 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1601 blkoff = (ino % inodes_per_block) * fs->inodesz; 1602 /* Read the inode. */ 1603 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1604 log2blksz), blkoff, 1605 sizeof(struct ext2_inode), (char *)inode); 1606 if (status == 0) 1607 return 0; 1608 1609 return 1; 1610 } 1611 1612 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1613 { 1614 long int blknr; 1615 int blksz; 1616 int log2_blksz; 1617 int status; 1618 long int rblock; 1619 long int perblock_parent; 1620 long int perblock_child; 1621 unsigned long long start; 1622 /* get the blocksize of the filesystem */ 1623 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1624 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1625 - get_fs()->dev_desc->log2blksz; 1626 1627 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1628 char *buf = zalloc(blksz); 1629 if (!buf) 1630 return -ENOMEM; 1631 struct ext4_extent_header *ext_block; 1632 struct ext4_extent *extent; 1633 int i = -1; 1634 ext_block = 1635 ext4fs_get_extent_block(ext4fs_root, buf, 1636 (struct ext4_extent_header *) 1637 inode->b.blocks.dir_blocks, 1638 fileblock, log2_blksz); 1639 if (!ext_block) { 1640 printf("invalid extent block\n"); 1641 free(buf); 1642 return -EINVAL; 1643 } 1644 1645 extent = (struct ext4_extent *)(ext_block + 1); 1646 1647 do { 1648 i++; 1649 if (i >= le16_to_cpu(ext_block->eh_entries)) 1650 break; 1651 } while (fileblock >= le32_to_cpu(extent[i].ee_block)); 1652 if (--i >= 0) { 1653 fileblock -= le32_to_cpu(extent[i].ee_block); 1654 if (fileblock >= le16_to_cpu(extent[i].ee_len)) { 1655 free(buf); 1656 return 0; 1657 } 1658 1659 start = le16_to_cpu(extent[i].ee_start_hi); 1660 start = (start << 32) + 1661 le32_to_cpu(extent[i].ee_start_lo); 1662 free(buf); 1663 return fileblock + start; 1664 } 1665 1666 printf("Extent Error\n"); 1667 free(buf); 1668 return -1; 1669 } 1670 1671 /* Direct blocks. */ 1672 if (fileblock < INDIRECT_BLOCKS) 1673 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1674 1675 /* Indirect. */ 1676 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1677 if (ext4fs_indir1_block == NULL) { 1678 ext4fs_indir1_block = zalloc(blksz); 1679 if (ext4fs_indir1_block == NULL) { 1680 printf("** SI ext2fs read block (indir 1)" 1681 "malloc failed. **\n"); 1682 return -1; 1683 } 1684 ext4fs_indir1_size = blksz; 1685 ext4fs_indir1_blkno = -1; 1686 } 1687 if (blksz != ext4fs_indir1_size) { 1688 free(ext4fs_indir1_block); 1689 ext4fs_indir1_block = NULL; 1690 ext4fs_indir1_size = 0; 1691 ext4fs_indir1_blkno = -1; 1692 ext4fs_indir1_block = zalloc(blksz); 1693 if (ext4fs_indir1_block == NULL) { 1694 printf("** SI ext2fs read block (indir 1):" 1695 "malloc failed. **\n"); 1696 return -1; 1697 } 1698 ext4fs_indir1_size = blksz; 1699 } 1700 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1701 log2_blksz) != ext4fs_indir1_blkno) { 1702 status = 1703 ext4fs_devread((lbaint_t)le32_to_cpu 1704 (inode->b.blocks. 1705 indir_block) << log2_blksz, 0, 1706 blksz, (char *)ext4fs_indir1_block); 1707 if (status == 0) { 1708 printf("** SI ext2fs read block (indir 1)" 1709 "failed. **\n"); 1710 return -1; 1711 } 1712 ext4fs_indir1_blkno = 1713 le32_to_cpu(inode->b.blocks. 1714 indir_block) << log2_blksz; 1715 } 1716 blknr = le32_to_cpu(ext4fs_indir1_block 1717 [fileblock - INDIRECT_BLOCKS]); 1718 } 1719 /* Double indirect. */ 1720 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1721 (blksz / 4 + 1)))) { 1722 1723 long int perblock = blksz / 4; 1724 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1725 1726 if (ext4fs_indir1_block == NULL) { 1727 ext4fs_indir1_block = zalloc(blksz); 1728 if (ext4fs_indir1_block == NULL) { 1729 printf("** DI ext2fs read block (indir 2 1)" 1730 "malloc failed. **\n"); 1731 return -1; 1732 } 1733 ext4fs_indir1_size = blksz; 1734 ext4fs_indir1_blkno = -1; 1735 } 1736 if (blksz != ext4fs_indir1_size) { 1737 free(ext4fs_indir1_block); 1738 ext4fs_indir1_block = NULL; 1739 ext4fs_indir1_size = 0; 1740 ext4fs_indir1_blkno = -1; 1741 ext4fs_indir1_block = zalloc(blksz); 1742 if (ext4fs_indir1_block == NULL) { 1743 printf("** DI ext2fs read block (indir 2 1)" 1744 "malloc failed. **\n"); 1745 return -1; 1746 } 1747 ext4fs_indir1_size = blksz; 1748 } 1749 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1750 log2_blksz) != ext4fs_indir1_blkno) { 1751 status = 1752 ext4fs_devread((lbaint_t)le32_to_cpu 1753 (inode->b.blocks. 1754 double_indir_block) << log2_blksz, 1755 0, blksz, 1756 (char *)ext4fs_indir1_block); 1757 if (status == 0) { 1758 printf("** DI ext2fs read block (indir 2 1)" 1759 "failed. **\n"); 1760 return -1; 1761 } 1762 ext4fs_indir1_blkno = 1763 le32_to_cpu(inode->b.blocks.double_indir_block) << 1764 log2_blksz; 1765 } 1766 1767 if (ext4fs_indir2_block == NULL) { 1768 ext4fs_indir2_block = zalloc(blksz); 1769 if (ext4fs_indir2_block == NULL) { 1770 printf("** DI ext2fs read block (indir 2 2)" 1771 "malloc failed. **\n"); 1772 return -1; 1773 } 1774 ext4fs_indir2_size = blksz; 1775 ext4fs_indir2_blkno = -1; 1776 } 1777 if (blksz != ext4fs_indir2_size) { 1778 free(ext4fs_indir2_block); 1779 ext4fs_indir2_block = NULL; 1780 ext4fs_indir2_size = 0; 1781 ext4fs_indir2_blkno = -1; 1782 ext4fs_indir2_block = zalloc(blksz); 1783 if (ext4fs_indir2_block == NULL) { 1784 printf("** DI ext2fs read block (indir 2 2)" 1785 "malloc failed. **\n"); 1786 return -1; 1787 } 1788 ext4fs_indir2_size = blksz; 1789 } 1790 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1791 log2_blksz) != ext4fs_indir2_blkno) { 1792 status = ext4fs_devread((lbaint_t)le32_to_cpu 1793 (ext4fs_indir1_block 1794 [rblock / 1795 perblock]) << log2_blksz, 0, 1796 blksz, 1797 (char *)ext4fs_indir2_block); 1798 if (status == 0) { 1799 printf("** DI ext2fs read block (indir 2 2)" 1800 "failed. **\n"); 1801 return -1; 1802 } 1803 ext4fs_indir2_blkno = 1804 le32_to_cpu(ext4fs_indir1_block[rblock 1805 / 1806 perblock]) << 1807 log2_blksz; 1808 } 1809 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1810 } 1811 /* Tripple indirect. */ 1812 else { 1813 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1814 (blksz / 4 * blksz / 4)); 1815 perblock_child = blksz / 4; 1816 perblock_parent = ((blksz / 4) * (blksz / 4)); 1817 1818 if (ext4fs_indir1_block == NULL) { 1819 ext4fs_indir1_block = zalloc(blksz); 1820 if (ext4fs_indir1_block == NULL) { 1821 printf("** TI ext2fs read block (indir 2 1)" 1822 "malloc failed. **\n"); 1823 return -1; 1824 } 1825 ext4fs_indir1_size = blksz; 1826 ext4fs_indir1_blkno = -1; 1827 } 1828 if (blksz != ext4fs_indir1_size) { 1829 free(ext4fs_indir1_block); 1830 ext4fs_indir1_block = NULL; 1831 ext4fs_indir1_size = 0; 1832 ext4fs_indir1_blkno = -1; 1833 ext4fs_indir1_block = zalloc(blksz); 1834 if (ext4fs_indir1_block == NULL) { 1835 printf("** TI ext2fs read block (indir 2 1)" 1836 "malloc failed. **\n"); 1837 return -1; 1838 } 1839 ext4fs_indir1_size = blksz; 1840 } 1841 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1842 log2_blksz) != ext4fs_indir1_blkno) { 1843 status = ext4fs_devread 1844 ((lbaint_t) 1845 le32_to_cpu(inode->b.blocks.triple_indir_block) 1846 << log2_blksz, 0, blksz, 1847 (char *)ext4fs_indir1_block); 1848 if (status == 0) { 1849 printf("** TI ext2fs read block (indir 2 1)" 1850 "failed. **\n"); 1851 return -1; 1852 } 1853 ext4fs_indir1_blkno = 1854 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1855 log2_blksz; 1856 } 1857 1858 if (ext4fs_indir2_block == NULL) { 1859 ext4fs_indir2_block = zalloc(blksz); 1860 if (ext4fs_indir2_block == NULL) { 1861 printf("** TI ext2fs read block (indir 2 2)" 1862 "malloc failed. **\n"); 1863 return -1; 1864 } 1865 ext4fs_indir2_size = blksz; 1866 ext4fs_indir2_blkno = -1; 1867 } 1868 if (blksz != ext4fs_indir2_size) { 1869 free(ext4fs_indir2_block); 1870 ext4fs_indir2_block = NULL; 1871 ext4fs_indir2_size = 0; 1872 ext4fs_indir2_blkno = -1; 1873 ext4fs_indir2_block = zalloc(blksz); 1874 if (ext4fs_indir2_block == NULL) { 1875 printf("** TI ext2fs read block (indir 2 2)" 1876 "malloc failed. **\n"); 1877 return -1; 1878 } 1879 ext4fs_indir2_size = blksz; 1880 } 1881 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1882 perblock_parent]) << 1883 log2_blksz) 1884 != ext4fs_indir2_blkno) { 1885 status = ext4fs_devread((lbaint_t)le32_to_cpu 1886 (ext4fs_indir1_block 1887 [rblock / 1888 perblock_parent]) << 1889 log2_blksz, 0, blksz, 1890 (char *)ext4fs_indir2_block); 1891 if (status == 0) { 1892 printf("** TI ext2fs read block (indir 2 2)" 1893 "failed. **\n"); 1894 return -1; 1895 } 1896 ext4fs_indir2_blkno = 1897 le32_to_cpu(ext4fs_indir1_block[rblock / 1898 perblock_parent]) 1899 << log2_blksz; 1900 } 1901 1902 if (ext4fs_indir3_block == NULL) { 1903 ext4fs_indir3_block = zalloc(blksz); 1904 if (ext4fs_indir3_block == NULL) { 1905 printf("** TI ext2fs read block (indir 2 2)" 1906 "malloc failed. **\n"); 1907 return -1; 1908 } 1909 ext4fs_indir3_size = blksz; 1910 ext4fs_indir3_blkno = -1; 1911 } 1912 if (blksz != ext4fs_indir3_size) { 1913 free(ext4fs_indir3_block); 1914 ext4fs_indir3_block = NULL; 1915 ext4fs_indir3_size = 0; 1916 ext4fs_indir3_blkno = -1; 1917 ext4fs_indir3_block = zalloc(blksz); 1918 if (ext4fs_indir3_block == NULL) { 1919 printf("** TI ext2fs read block (indir 2 2)" 1920 "malloc failed. **\n"); 1921 return -1; 1922 } 1923 ext4fs_indir3_size = blksz; 1924 } 1925 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1926 / 1927 perblock_child]) << 1928 log2_blksz) != ext4fs_indir3_blkno) { 1929 status = 1930 ext4fs_devread((lbaint_t)le32_to_cpu 1931 (ext4fs_indir2_block 1932 [(rblock / perblock_child) 1933 % (blksz / 4)]) << log2_blksz, 0, 1934 blksz, (char *)ext4fs_indir3_block); 1935 if (status == 0) { 1936 printf("** TI ext2fs read block (indir 2 2)" 1937 "failed. **\n"); 1938 return -1; 1939 } 1940 ext4fs_indir3_blkno = 1941 le32_to_cpu(ext4fs_indir2_block[(rblock / 1942 perblock_child) % 1943 (blksz / 1944 4)]) << 1945 log2_blksz; 1946 } 1947 1948 blknr = le32_to_cpu(ext4fs_indir3_block 1949 [rblock % perblock_child]); 1950 } 1951 debug("read_allocated_block %ld\n", blknr); 1952 1953 return blknr; 1954 } 1955 1956 /** 1957 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1958 * global pointers 1959 * 1960 * This function assures that for a file with the same name but different size 1961 * the sequential store on the ext4 filesystem will be correct. 1962 * 1963 * In this function the global data, responsible for internal representation 1964 * of the ext4 data are initialized to the reset state. Without this, during 1965 * replacement of the smaller file with the bigger truncation of new file was 1966 * performed. 1967 */ 1968 void ext4fs_reinit_global(void) 1969 { 1970 if (ext4fs_indir1_block != NULL) { 1971 free(ext4fs_indir1_block); 1972 ext4fs_indir1_block = NULL; 1973 ext4fs_indir1_size = 0; 1974 ext4fs_indir1_blkno = -1; 1975 } 1976 if (ext4fs_indir2_block != NULL) { 1977 free(ext4fs_indir2_block); 1978 ext4fs_indir2_block = NULL; 1979 ext4fs_indir2_size = 0; 1980 ext4fs_indir2_blkno = -1; 1981 } 1982 if (ext4fs_indir3_block != NULL) { 1983 free(ext4fs_indir3_block); 1984 ext4fs_indir3_block = NULL; 1985 ext4fs_indir3_size = 0; 1986 ext4fs_indir3_blkno = -1; 1987 } 1988 } 1989 void ext4fs_close(void) 1990 { 1991 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1992 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1993 ext4fs_file = NULL; 1994 } 1995 if (ext4fs_root != NULL) { 1996 free(ext4fs_root); 1997 ext4fs_root = NULL; 1998 } 1999 2000 ext4fs_reinit_global(); 2001 } 2002 2003 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 2004 struct ext2fs_node **fnode, int *ftype) 2005 { 2006 unsigned int fpos = 0; 2007 int status; 2008 loff_t actread; 2009 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 2010 2011 #ifdef DEBUG 2012 if (name != NULL) 2013 printf("Iterate dir %s\n", name); 2014 #endif /* of DEBUG */ 2015 if (!diro->inode_read) { 2016 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2017 if (status == 0) 2018 return 0; 2019 } 2020 /* Search the file. */ 2021 while (fpos < le32_to_cpu(diro->inode.size)) { 2022 struct ext2_dirent dirent; 2023 2024 status = ext4fs_read_file(diro, fpos, 2025 sizeof(struct ext2_dirent), 2026 (char *)&dirent, &actread); 2027 if (status < 0) 2028 return 0; 2029 2030 if (dirent.direntlen == 0) { 2031 printf("Failed to iterate over directory %s\n", name); 2032 return 0; 2033 } 2034 2035 if (dirent.namelen != 0) { 2036 char filename[dirent.namelen + 1]; 2037 struct ext2fs_node *fdiro; 2038 int type = FILETYPE_UNKNOWN; 2039 2040 status = ext4fs_read_file(diro, 2041 fpos + 2042 sizeof(struct ext2_dirent), 2043 dirent.namelen, filename, 2044 &actread); 2045 if (status < 0) 2046 return 0; 2047 2048 fdiro = zalloc(sizeof(struct ext2fs_node)); 2049 if (!fdiro) 2050 return 0; 2051 2052 fdiro->data = diro->data; 2053 fdiro->ino = le32_to_cpu(dirent.inode); 2054 2055 filename[dirent.namelen] = '\0'; 2056 2057 if (dirent.filetype != FILETYPE_UNKNOWN) { 2058 fdiro->inode_read = 0; 2059 2060 if (dirent.filetype == FILETYPE_DIRECTORY) 2061 type = FILETYPE_DIRECTORY; 2062 else if (dirent.filetype == FILETYPE_SYMLINK) 2063 type = FILETYPE_SYMLINK; 2064 else if (dirent.filetype == FILETYPE_REG) 2065 type = FILETYPE_REG; 2066 } else { 2067 status = ext4fs_read_inode(diro->data, 2068 le32_to_cpu 2069 (dirent.inode), 2070 &fdiro->inode); 2071 if (status == 0) { 2072 free(fdiro); 2073 return 0; 2074 } 2075 fdiro->inode_read = 1; 2076 2077 if ((le16_to_cpu(fdiro->inode.mode) & 2078 FILETYPE_INO_MASK) == 2079 FILETYPE_INO_DIRECTORY) { 2080 type = FILETYPE_DIRECTORY; 2081 } else if ((le16_to_cpu(fdiro->inode.mode) 2082 & FILETYPE_INO_MASK) == 2083 FILETYPE_INO_SYMLINK) { 2084 type = FILETYPE_SYMLINK; 2085 } else if ((le16_to_cpu(fdiro->inode.mode) 2086 & FILETYPE_INO_MASK) == 2087 FILETYPE_INO_REG) { 2088 type = FILETYPE_REG; 2089 } 2090 } 2091 #ifdef DEBUG 2092 printf("iterate >%s<\n", filename); 2093 #endif /* of DEBUG */ 2094 if ((name != NULL) && (fnode != NULL) 2095 && (ftype != NULL)) { 2096 if (strcmp(filename, name) == 0) { 2097 *ftype = type; 2098 *fnode = fdiro; 2099 return 1; 2100 } 2101 } else { 2102 if (fdiro->inode_read == 0) { 2103 status = ext4fs_read_inode(diro->data, 2104 le32_to_cpu( 2105 dirent.inode), 2106 &fdiro->inode); 2107 if (status == 0) { 2108 free(fdiro); 2109 return 0; 2110 } 2111 fdiro->inode_read = 1; 2112 } 2113 switch (type) { 2114 case FILETYPE_DIRECTORY: 2115 printf("<DIR> "); 2116 break; 2117 case FILETYPE_SYMLINK: 2118 printf("<SYM> "); 2119 break; 2120 case FILETYPE_REG: 2121 printf(" "); 2122 break; 2123 default: 2124 printf("< ? > "); 2125 break; 2126 } 2127 printf("%10u %s\n", 2128 le32_to_cpu(fdiro->inode.size), 2129 filename); 2130 } 2131 free(fdiro); 2132 } 2133 fpos += le16_to_cpu(dirent.direntlen); 2134 } 2135 return 0; 2136 } 2137 2138 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2139 { 2140 char *symlink; 2141 struct ext2fs_node *diro = node; 2142 int status; 2143 loff_t actread; 2144 2145 if (!diro->inode_read) { 2146 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2147 if (status == 0) 2148 return NULL; 2149 } 2150 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2151 if (!symlink) 2152 return NULL; 2153 2154 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2155 strncpy(symlink, diro->inode.b.symlink, 2156 le32_to_cpu(diro->inode.size)); 2157 } else { 2158 status = ext4fs_read_file(diro, 0, 2159 le32_to_cpu(diro->inode.size), 2160 symlink, &actread); 2161 if ((status < 0) || (actread == 0)) { 2162 free(symlink); 2163 return NULL; 2164 } 2165 } 2166 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2167 return symlink; 2168 } 2169 2170 static int ext4fs_find_file1(const char *currpath, 2171 struct ext2fs_node *currroot, 2172 struct ext2fs_node **currfound, int *foundtype) 2173 { 2174 char fpath[strlen(currpath) + 1]; 2175 char *name = fpath; 2176 char *next; 2177 int status; 2178 int type = FILETYPE_DIRECTORY; 2179 struct ext2fs_node *currnode = currroot; 2180 struct ext2fs_node *oldnode = currroot; 2181 2182 strncpy(fpath, currpath, strlen(currpath) + 1); 2183 2184 /* Remove all leading slashes. */ 2185 while (*name == '/') 2186 name++; 2187 2188 if (!*name) { 2189 *currfound = currnode; 2190 return 1; 2191 } 2192 2193 for (;;) { 2194 int found; 2195 2196 /* Extract the actual part from the pathname. */ 2197 next = strchr(name, '/'); 2198 if (next) { 2199 /* Remove all leading slashes. */ 2200 while (*next == '/') 2201 *(next++) = '\0'; 2202 } 2203 2204 if (type != FILETYPE_DIRECTORY) { 2205 ext4fs_free_node(currnode, currroot); 2206 return 0; 2207 } 2208 2209 oldnode = currnode; 2210 2211 /* Iterate over the directory. */ 2212 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2213 if (found == 0) 2214 return 0; 2215 2216 if (found == -1) 2217 break; 2218 2219 /* Read in the symlink and follow it. */ 2220 if (type == FILETYPE_SYMLINK) { 2221 char *symlink; 2222 2223 /* Test if the symlink does not loop. */ 2224 if (++symlinknest == 8) { 2225 ext4fs_free_node(currnode, currroot); 2226 ext4fs_free_node(oldnode, currroot); 2227 return 0; 2228 } 2229 2230 symlink = ext4fs_read_symlink(currnode); 2231 ext4fs_free_node(currnode, currroot); 2232 2233 if (!symlink) { 2234 ext4fs_free_node(oldnode, currroot); 2235 return 0; 2236 } 2237 2238 debug("Got symlink >%s<\n", symlink); 2239 2240 if (symlink[0] == '/') { 2241 ext4fs_free_node(oldnode, currroot); 2242 oldnode = &ext4fs_root->diropen; 2243 } 2244 2245 /* Lookup the node the symlink points to. */ 2246 status = ext4fs_find_file1(symlink, oldnode, 2247 &currnode, &type); 2248 2249 free(symlink); 2250 2251 if (status == 0) { 2252 ext4fs_free_node(oldnode, currroot); 2253 return 0; 2254 } 2255 } 2256 2257 ext4fs_free_node(oldnode, currroot); 2258 2259 /* Found the node! */ 2260 if (!next || *next == '\0') { 2261 *currfound = currnode; 2262 *foundtype = type; 2263 return 1; 2264 } 2265 name = next; 2266 } 2267 return -1; 2268 } 2269 2270 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2271 struct ext2fs_node **foundnode, int expecttype) 2272 { 2273 int status; 2274 int foundtype = FILETYPE_DIRECTORY; 2275 2276 symlinknest = 0; 2277 if (!path) 2278 return 0; 2279 2280 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2281 if (status == 0) 2282 return 0; 2283 2284 /* Check if the node that was found was of the expected type. */ 2285 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2286 return 0; 2287 else if ((expecttype == FILETYPE_DIRECTORY) 2288 && (foundtype != expecttype)) 2289 return 0; 2290 2291 return 1; 2292 } 2293 2294 int ext4fs_open(const char *filename, loff_t *len) 2295 { 2296 struct ext2fs_node *fdiro = NULL; 2297 int status; 2298 2299 if (ext4fs_root == NULL) 2300 return -1; 2301 2302 ext4fs_file = NULL; 2303 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2304 FILETYPE_REG); 2305 if (status == 0) 2306 goto fail; 2307 2308 if (!fdiro->inode_read) { 2309 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2310 &fdiro->inode); 2311 if (status == 0) 2312 goto fail; 2313 } 2314 *len = le32_to_cpu(fdiro->inode.size); 2315 ext4fs_file = fdiro; 2316 2317 return 0; 2318 fail: 2319 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2320 2321 return -1; 2322 } 2323 2324 int ext4fs_mount(unsigned part_length) 2325 { 2326 struct ext2_data *data; 2327 int status; 2328 struct ext_filesystem *fs = get_fs(); 2329 data = zalloc(SUPERBLOCK_SIZE); 2330 if (!data) 2331 return 0; 2332 2333 /* Read the superblock. */ 2334 status = ext4_read_superblock((char *)&data->sblock); 2335 2336 if (status == 0) 2337 goto fail; 2338 2339 /* Make sure this is an ext2 filesystem. */ 2340 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2341 goto fail; 2342 2343 2344 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2345 fs->inodesz = 128; 2346 } else { 2347 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2348 __le32_to_cpu(data->sblock.feature_compatibility), 2349 __le32_to_cpu(data->sblock.feature_incompat), 2350 __le32_to_cpu(data->sblock.feature_ro_compat)); 2351 2352 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2353 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2354 EXT4_FEATURE_INCOMPAT_64BIT ? 2355 le16_to_cpu(data->sblock.descriptor_size) : 32; 2356 } 2357 2358 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2359 le32_to_cpu(data->sblock.revision_level), 2360 fs->inodesz, fs->gdsize); 2361 2362 data->diropen.data = data; 2363 data->diropen.ino = 2; 2364 data->diropen.inode_read = 1; 2365 data->inode = &data->diropen.inode; 2366 2367 status = ext4fs_read_inode(data, 2, data->inode); 2368 if (status == 0) 2369 goto fail; 2370 2371 ext4fs_root = data; 2372 2373 return 1; 2374 fail: 2375 printf("Failed to mount ext2 filesystem...\n"); 2376 free(data); 2377 ext4fs_root = NULL; 2378 2379 return 0; 2380 } 2381