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