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 if (offset < fs->gdsize) { 436 crc = ext2fs_crc16(crc, (__u8 *)desc + offset, 437 fs->gdsize - offset); 438 } 439 } 440 441 return crc; 442 } 443 444 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) 445 { 446 int dentry_length; 447 int sizeof_void_space; 448 int new_entry_byte_reqd; 449 short padding_factor = 0; 450 451 if (dir->namelen % 4 != 0) 452 padding_factor = 4 - (dir->namelen % 4); 453 454 dentry_length = sizeof(struct ext2_dirent) + 455 dir->namelen + padding_factor; 456 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; 457 if (sizeof_void_space == 0) 458 return 0; 459 460 padding_factor = 0; 461 if (strlen(filename) % 4 != 0) 462 padding_factor = 4 - (strlen(filename) % 4); 463 464 new_entry_byte_reqd = strlen(filename) + 465 sizeof(struct ext2_dirent) + padding_factor; 466 if (sizeof_void_space >= new_entry_byte_reqd) { 467 dir->direntlen = cpu_to_le16(dentry_length); 468 return sizeof_void_space; 469 } 470 471 return 0; 472 } 473 474 int ext4fs_update_parent_dentry(char *filename, int file_type) 475 { 476 unsigned int *zero_buffer = NULL; 477 char *root_first_block_buffer = NULL; 478 int blk_idx; 479 long int first_block_no_of_root = 0; 480 int totalbytes = 0; 481 unsigned int new_entry_byte_reqd; 482 int sizeof_void_space = 0; 483 int templength = 0; 484 int inodeno = -1; 485 int status; 486 struct ext_filesystem *fs = get_fs(); 487 /* directory entry */ 488 struct ext2_dirent *dir; 489 char *temp_dir = NULL; 490 uint32_t new_blk_no; 491 uint32_t new_size; 492 uint32_t new_blockcnt; 493 uint32_t directory_blocks; 494 495 zero_buffer = zalloc(fs->blksz); 496 if (!zero_buffer) { 497 printf("No Memory\n"); 498 return -1; 499 } 500 root_first_block_buffer = zalloc(fs->blksz); 501 if (!root_first_block_buffer) { 502 free(zero_buffer); 503 printf("No Memory\n"); 504 return -1; 505 } 506 new_entry_byte_reqd = ROUND(strlen(filename) + 507 sizeof(struct ext2_dirent), 4); 508 restart: 509 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 510 LOG2_BLOCK_SIZE(ext4fs_root); 511 blk_idx = directory_blocks - 1; 512 513 restart_read: 514 /* read the block no allocated to a file */ 515 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx); 516 if (first_block_no_of_root <= 0) 517 goto fail; 518 519 status = ext4fs_devread((lbaint_t)first_block_no_of_root 520 * fs->sect_perblk, 521 0, fs->blksz, root_first_block_buffer); 522 if (status == 0) 523 goto fail; 524 525 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 526 goto fail; 527 dir = (struct ext2_dirent *)root_first_block_buffer; 528 totalbytes = 0; 529 530 while (le16_to_cpu(dir->direntlen) > 0) { 531 unsigned short used_len = ROUND(dir->namelen + 532 sizeof(struct ext2_dirent), 4); 533 534 /* last entry of block */ 535 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { 536 537 /* check if new entry fits */ 538 if ((used_len + new_entry_byte_reqd) <= 539 le16_to_cpu(dir->direntlen)) { 540 dir->direntlen = cpu_to_le16(used_len); 541 break; 542 } else { 543 if (blk_idx > 0) { 544 printf("Block full, trying previous\n"); 545 blk_idx--; 546 goto restart_read; 547 } 548 printf("All blocks full: Allocate new\n"); 549 550 if (le32_to_cpu(g_parent_inode->flags) & 551 EXT4_EXTENTS_FL) { 552 printf("Directory uses extents\n"); 553 goto fail; 554 } 555 if (directory_blocks >= INDIRECT_BLOCKS) { 556 printf("Directory exceeds limit\n"); 557 goto fail; 558 } 559 new_blk_no = ext4fs_get_new_blk_no(); 560 if (new_blk_no == -1) { 561 printf("no block left to assign\n"); 562 goto fail; 563 } 564 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); 565 g_parent_inode->b.blocks. 566 dir_blocks[directory_blocks] = 567 cpu_to_le32(new_blk_no); 568 569 new_size = le32_to_cpu(g_parent_inode->size); 570 new_size += fs->blksz; 571 g_parent_inode->size = cpu_to_le32(new_size); 572 573 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); 574 new_blockcnt += fs->sect_perblk; 575 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); 576 577 if (ext4fs_put_metadata 578 (root_first_block_buffer, 579 first_block_no_of_root)) 580 goto fail; 581 goto restart; 582 } 583 } 584 585 templength = le16_to_cpu(dir->direntlen); 586 totalbytes = totalbytes + templength; 587 sizeof_void_space = check_void_in_dentry(dir, filename); 588 if (sizeof_void_space) 589 break; 590 591 dir = (struct ext2_dirent *)((char *)dir + templength); 592 } 593 594 /* make a pointer ready for creating next directory entry */ 595 templength = le16_to_cpu(dir->direntlen); 596 totalbytes = totalbytes + templength; 597 dir = (struct ext2_dirent *)((char *)dir + templength); 598 599 /* get the next available inode number */ 600 inodeno = ext4fs_get_new_inode_no(); 601 if (inodeno == -1) { 602 printf("no inode left to assign\n"); 603 goto fail; 604 } 605 dir->inode = cpu_to_le32(inodeno); 606 if (sizeof_void_space) 607 dir->direntlen = cpu_to_le16(sizeof_void_space); 608 else 609 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); 610 611 dir->namelen = strlen(filename); 612 dir->filetype = FILETYPE_REG; /* regular file */ 613 temp_dir = (char *)dir; 614 temp_dir = temp_dir + sizeof(struct ext2_dirent); 615 memcpy(temp_dir, filename, strlen(filename)); 616 617 /* update or write the 1st block of root inode */ 618 if (ext4fs_put_metadata(root_first_block_buffer, 619 first_block_no_of_root)) 620 goto fail; 621 622 fail: 623 free(zero_buffer); 624 free(root_first_block_buffer); 625 626 return inodeno; 627 } 628 629 static int search_dir(struct ext2_inode *parent_inode, char *dirname) 630 { 631 int status; 632 int inodeno = 0; 633 int offset; 634 int blk_idx; 635 long int blknr; 636 char *block_buffer = NULL; 637 struct ext2_dirent *dir = NULL; 638 struct ext_filesystem *fs = get_fs(); 639 uint32_t directory_blocks; 640 char *direntname; 641 642 directory_blocks = le32_to_cpu(parent_inode->size) >> 643 LOG2_BLOCK_SIZE(ext4fs_root); 644 645 block_buffer = zalloc(fs->blksz); 646 if (!block_buffer) 647 goto fail; 648 649 /* get the block no allocated to a file */ 650 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 651 blknr = read_allocated_block(parent_inode, blk_idx); 652 if (blknr <= 0) 653 goto fail; 654 655 /* read the directory block */ 656 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 657 0, fs->blksz, (char *)block_buffer); 658 if (status == 0) 659 goto fail; 660 661 offset = 0; 662 do { 663 if (offset & 3) { 664 printf("Badly aligned ext2_dirent\n"); 665 break; 666 } 667 668 dir = (struct ext2_dirent *)(block_buffer + offset); 669 direntname = (char*)(dir) + sizeof(struct ext2_dirent); 670 671 int direntlen = le16_to_cpu(dir->direntlen); 672 if (direntlen < sizeof(struct ext2_dirent)) 673 break; 674 675 if (dir->inode && (strlen(dirname) == dir->namelen) && 676 (strncmp(dirname, direntname, dir->namelen) == 0)) { 677 inodeno = le32_to_cpu(dir->inode); 678 break; 679 } 680 681 offset += direntlen; 682 683 } while (offset < fs->blksz); 684 685 if (inodeno > 0) { 686 free(block_buffer); 687 return inodeno; 688 } 689 } 690 691 fail: 692 free(block_buffer); 693 694 return -1; 695 } 696 697 static int find_dir_depth(char *dirname) 698 { 699 char *token = strtok(dirname, "/"); 700 int count = 0; 701 while (token != NULL) { 702 token = strtok(NULL, "/"); 703 count++; 704 } 705 return count + 1 + 1; 706 /* 707 * for example for string /home/temp 708 * depth=home(1)+temp(1)+1 extra for NULL; 709 * so count is 4; 710 */ 711 } 712 713 static int parse_path(char **arr, char *dirname) 714 { 715 char *token = strtok(dirname, "/"); 716 int i = 0; 717 718 /* add root */ 719 arr[i] = zalloc(strlen("/") + 1); 720 if (!arr[i]) 721 return -ENOMEM; 722 memcpy(arr[i++], "/", strlen("/")); 723 724 /* add each path entry after root */ 725 while (token != NULL) { 726 arr[i] = zalloc(strlen(token) + 1); 727 if (!arr[i]) 728 return -ENOMEM; 729 memcpy(arr[i++], token, strlen(token)); 730 token = strtok(NULL, "/"); 731 } 732 arr[i] = NULL; 733 734 return 0; 735 } 736 737 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 738 { 739 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 740 return -1; 741 742 return 0; 743 } 744 745 /* 746 * Function: ext4fs_get_parent_inode_num 747 * Return Value: inode Number of the parent directory of file/Directory to be 748 * created 749 * dirname : Input parmater, input path name of the file/directory to be created 750 * dname : Output parameter, to be filled with the name of the directory 751 * extracted from dirname 752 */ 753 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 754 { 755 int i; 756 int depth = 0; 757 int matched_inode_no; 758 int result_inode_no = -1; 759 char **ptr = NULL; 760 char *depth_dirname = NULL; 761 char *parse_dirname = NULL; 762 struct ext2_inode *parent_inode = NULL; 763 struct ext2_inode *first_inode = NULL; 764 struct ext2_inode temp_inode; 765 766 if (*dirname != '/') { 767 printf("Please supply Absolute path\n"); 768 return -1; 769 } 770 771 /* TODO: input validation make equivalent to linux */ 772 depth_dirname = zalloc(strlen(dirname) + 1); 773 if (!depth_dirname) 774 return -ENOMEM; 775 776 memcpy(depth_dirname, dirname, strlen(dirname)); 777 depth = find_dir_depth(depth_dirname); 778 parse_dirname = zalloc(strlen(dirname) + 1); 779 if (!parse_dirname) 780 goto fail; 781 memcpy(parse_dirname, dirname, strlen(dirname)); 782 783 /* allocate memory for each directory level */ 784 ptr = zalloc((depth) * sizeof(char *)); 785 if (!ptr) 786 goto fail; 787 if (parse_path(ptr, parse_dirname)) 788 goto fail; 789 parent_inode = zalloc(sizeof(struct ext2_inode)); 790 if (!parent_inode) 791 goto fail; 792 first_inode = zalloc(sizeof(struct ext2_inode)); 793 if (!first_inode) 794 goto fail; 795 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 796 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 797 if (flags & F_FILE) 798 result_inode_no = EXT2_ROOT_INO; 799 for (i = 1; i < depth; i++) { 800 matched_inode_no = search_dir(parent_inode, ptr[i]); 801 if (matched_inode_no == -1) { 802 if (ptr[i + 1] == NULL && i == 1) { 803 result_inode_no = EXT2_ROOT_INO; 804 goto end; 805 } else { 806 if (ptr[i + 1] == NULL) 807 break; 808 printf("Invalid path\n"); 809 result_inode_no = -1; 810 goto fail; 811 } 812 } else { 813 if (ptr[i + 1] != NULL) { 814 memset(parent_inode, '\0', 815 sizeof(struct ext2_inode)); 816 if (ext4fs_iget(matched_inode_no, 817 parent_inode)) { 818 result_inode_no = -1; 819 goto fail; 820 } 821 result_inode_no = matched_inode_no; 822 } else { 823 break; 824 } 825 } 826 } 827 828 end: 829 if (i == 1) 830 matched_inode_no = search_dir(first_inode, ptr[i]); 831 else 832 matched_inode_no = search_dir(parent_inode, ptr[i]); 833 834 if (matched_inode_no != -1) { 835 ext4fs_iget(matched_inode_no, &temp_inode); 836 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { 837 printf("It is a Directory\n"); 838 result_inode_no = -1; 839 goto fail; 840 } 841 } 842 843 if (strlen(ptr[i]) > 256) { 844 result_inode_no = -1; 845 goto fail; 846 } 847 memcpy(dname, ptr[i], strlen(ptr[i])); 848 849 fail: 850 free(depth_dirname); 851 free(parse_dirname); 852 for (i = 0; i < depth; i++) { 853 if (!ptr[i]) 854 break; 855 free(ptr[i]); 856 } 857 free(ptr); 858 free(parent_inode); 859 free(first_inode); 860 861 return result_inode_no; 862 } 863 864 static int unlink_filename(char *filename, unsigned int blknr) 865 { 866 int status; 867 int inodeno = 0; 868 int offset; 869 char *block_buffer = NULL; 870 struct ext2_dirent *dir = NULL; 871 struct ext2_dirent *previous_dir; 872 struct ext_filesystem *fs = get_fs(); 873 int ret = -1; 874 char *direntname; 875 876 block_buffer = zalloc(fs->blksz); 877 if (!block_buffer) 878 return -ENOMEM; 879 880 /* read the directory block */ 881 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 882 fs->blksz, block_buffer); 883 if (status == 0) 884 goto fail; 885 886 offset = 0; 887 do { 888 if (offset & 3) { 889 printf("Badly aligned ext2_dirent\n"); 890 break; 891 } 892 893 previous_dir = dir; 894 dir = (struct ext2_dirent *)(block_buffer + offset); 895 direntname = (char *)(dir) + sizeof(struct ext2_dirent); 896 897 int direntlen = le16_to_cpu(dir->direntlen); 898 if (direntlen < sizeof(struct ext2_dirent)) 899 break; 900 901 if (dir->inode && (strlen(filename) == dir->namelen) && 902 (strncmp(direntname, filename, dir->namelen) == 0)) { 903 inodeno = le32_to_cpu(dir->inode); 904 break; 905 } 906 907 offset += direntlen; 908 909 } while (offset < fs->blksz); 910 911 if (inodeno > 0) { 912 printf("file found, deleting\n"); 913 if (ext4fs_log_journal(block_buffer, blknr)) 914 goto fail; 915 916 if (previous_dir) { 917 /* merge dir entry with predecessor */ 918 uint16_t new_len; 919 new_len = le16_to_cpu(previous_dir->direntlen); 920 new_len += le16_to_cpu(dir->direntlen); 921 previous_dir->direntlen = cpu_to_le16(new_len); 922 } else { 923 /* invalidate dir entry */ 924 dir->inode = 0; 925 } 926 if (ext4fs_put_metadata(block_buffer, blknr)) 927 goto fail; 928 ret = inodeno; 929 } 930 fail: 931 free(block_buffer); 932 933 return ret; 934 } 935 936 int ext4fs_filename_unlink(char *filename) 937 { 938 int blk_idx; 939 long int blknr = -1; 940 int inodeno = -1; 941 uint32_t directory_blocks; 942 943 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 944 LOG2_BLOCK_SIZE(ext4fs_root); 945 946 /* read the block no allocated to a file */ 947 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 948 blknr = read_allocated_block(g_parent_inode, blk_idx); 949 if (blknr <= 0) 950 break; 951 inodeno = unlink_filename(filename, blknr); 952 if (inodeno != -1) 953 return inodeno; 954 } 955 956 return -1; 957 } 958 959 uint32_t ext4fs_get_new_blk_no(void) 960 { 961 short i; 962 short status; 963 int remainder; 964 unsigned int bg_idx; 965 static int prev_bg_bitmap_index = -1; 966 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 967 struct ext_filesystem *fs = get_fs(); 968 char *journal_buffer = zalloc(fs->blksz); 969 char *zero_buffer = zalloc(fs->blksz); 970 if (!journal_buffer || !zero_buffer) 971 goto fail; 972 973 if (fs->first_pass_bbmap == 0) { 974 for (i = 0; i < fs->no_blkgrp; i++) { 975 struct ext2_block_group *bgd = NULL; 976 bgd = ext4fs_get_group_descriptor(fs, i); 977 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 978 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 979 uint64_t b_bitmap_blk = 980 ext4fs_bg_get_block_id(bgd, fs); 981 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 982 memcpy(fs->blk_bmaps[i], zero_buffer, 983 fs->blksz); 984 put_ext4(b_bitmap_blk * fs->blksz, 985 fs->blk_bmaps[i], fs->blksz); 986 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 987 ext4fs_bg_set_flags(bgd, bg_flags); 988 } 989 fs->curr_blkno = 990 _get_new_blk_no(fs->blk_bmaps[i]); 991 if (fs->curr_blkno == -1) 992 /* block bitmap is completely filled */ 993 continue; 994 fs->curr_blkno = fs->curr_blkno + 995 (i * fs->blksz * 8); 996 fs->first_pass_bbmap++; 997 ext4fs_bg_free_blocks_dec(bgd, fs); 998 ext4fs_sb_free_blocks_dec(fs->sb); 999 status = ext4fs_devread(b_bitmap_blk * 1000 fs->sect_perblk, 1001 0, fs->blksz, 1002 journal_buffer); 1003 if (status == 0) 1004 goto fail; 1005 if (ext4fs_log_journal(journal_buffer, 1006 b_bitmap_blk)) 1007 goto fail; 1008 goto success; 1009 } else { 1010 debug("no space left on block group %d\n", i); 1011 } 1012 } 1013 1014 goto fail; 1015 } else { 1016 fs->curr_blkno++; 1017 restart: 1018 /* get the blockbitmap index respective to blockno */ 1019 bg_idx = fs->curr_blkno / blk_per_grp; 1020 if (fs->blksz == 1024) { 1021 remainder = fs->curr_blkno % blk_per_grp; 1022 if (!remainder) 1023 bg_idx--; 1024 } 1025 1026 /* 1027 * To skip completely filled block group bitmaps 1028 * Optimize the block allocation 1029 */ 1030 if (bg_idx >= fs->no_blkgrp) 1031 goto fail; 1032 1033 struct ext2_block_group *bgd = NULL; 1034 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1035 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1036 debug("block group %u is full. Skipping\n", bg_idx); 1037 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1038 if (fs->blksz == 1024) 1039 fs->curr_blkno += 1; 1040 goto restart; 1041 } 1042 1043 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1044 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1045 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1046 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1047 put_ext4(b_bitmap_blk * fs->blksz, 1048 zero_buffer, fs->blksz); 1049 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1050 ext4fs_bg_set_flags(bgd, bg_flags); 1051 } 1052 1053 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1054 bg_idx) != 0) { 1055 debug("going for restart for the block no %ld %u\n", 1056 fs->curr_blkno, bg_idx); 1057 fs->curr_blkno++; 1058 goto restart; 1059 } 1060 1061 /* journal backup */ 1062 if (prev_bg_bitmap_index != bg_idx) { 1063 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1064 0, fs->blksz, journal_buffer); 1065 if (status == 0) 1066 goto fail; 1067 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1068 goto fail; 1069 1070 prev_bg_bitmap_index = bg_idx; 1071 } 1072 ext4fs_bg_free_blocks_dec(bgd, fs); 1073 ext4fs_sb_free_blocks_dec(fs->sb); 1074 goto success; 1075 } 1076 success: 1077 free(journal_buffer); 1078 free(zero_buffer); 1079 1080 return fs->curr_blkno; 1081 fail: 1082 free(journal_buffer); 1083 free(zero_buffer); 1084 1085 return -1; 1086 } 1087 1088 int ext4fs_get_new_inode_no(void) 1089 { 1090 short i; 1091 short status; 1092 unsigned int ibmap_idx; 1093 static int prev_inode_bitmap_index = -1; 1094 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1095 struct ext_filesystem *fs = get_fs(); 1096 char *journal_buffer = zalloc(fs->blksz); 1097 char *zero_buffer = zalloc(fs->blksz); 1098 if (!journal_buffer || !zero_buffer) 1099 goto fail; 1100 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1101 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1102 1103 if (fs->first_pass_ibmap == 0) { 1104 for (i = 0; i < fs->no_blkgrp; i++) { 1105 uint32_t free_inodes; 1106 struct ext2_block_group *bgd = NULL; 1107 bgd = ext4fs_get_group_descriptor(fs, i); 1108 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1109 if (free_inodes) { 1110 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1111 uint64_t i_bitmap_blk = 1112 ext4fs_bg_get_inode_id(bgd, fs); 1113 if (has_gdt_chksum) 1114 bgd->bg_itable_unused = free_inodes; 1115 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1116 put_ext4(i_bitmap_blk * fs->blksz, 1117 zero_buffer, fs->blksz); 1118 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1119 ext4fs_bg_set_flags(bgd, bg_flags); 1120 memcpy(fs->inode_bmaps[i], 1121 zero_buffer, fs->blksz); 1122 } 1123 fs->curr_inode_no = 1124 _get_new_inode_no(fs->inode_bmaps[i]); 1125 if (fs->curr_inode_no == -1) 1126 /* inode bitmap is completely filled */ 1127 continue; 1128 fs->curr_inode_no = fs->curr_inode_no + 1129 (i * inodes_per_grp); 1130 fs->first_pass_ibmap++; 1131 ext4fs_bg_free_inodes_dec(bgd, fs); 1132 if (has_gdt_chksum) 1133 ext4fs_bg_itable_unused_dec(bgd, fs); 1134 ext4fs_sb_free_inodes_dec(fs->sb); 1135 status = ext4fs_devread(i_bitmap_blk * 1136 fs->sect_perblk, 1137 0, fs->blksz, 1138 journal_buffer); 1139 if (status == 0) 1140 goto fail; 1141 if (ext4fs_log_journal(journal_buffer, 1142 i_bitmap_blk)) 1143 goto fail; 1144 goto success; 1145 } else 1146 debug("no inode left on block group %d\n", i); 1147 } 1148 goto fail; 1149 } else { 1150 restart: 1151 fs->curr_inode_no++; 1152 /* get the blockbitmap index respective to blockno */ 1153 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1154 struct ext2_block_group *bgd = 1155 ext4fs_get_group_descriptor(fs, ibmap_idx); 1156 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1157 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1158 1159 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1160 put_ext4(i_bitmap_blk * fs->blksz, 1161 zero_buffer, fs->blksz); 1162 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1163 ext4fs_bg_set_flags(bgd, bg_flags); 1164 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1165 fs->blksz); 1166 } 1167 1168 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1169 fs->inode_bmaps[ibmap_idx], 1170 ibmap_idx) != 0) { 1171 debug("going for restart for the block no %d %u\n", 1172 fs->curr_inode_no, ibmap_idx); 1173 goto restart; 1174 } 1175 1176 /* journal backup */ 1177 if (prev_inode_bitmap_index != ibmap_idx) { 1178 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1179 0, fs->blksz, journal_buffer); 1180 if (status == 0) 1181 goto fail; 1182 if (ext4fs_log_journal(journal_buffer, 1183 le32_to_cpu(bgd->inode_id))) 1184 goto fail; 1185 prev_inode_bitmap_index = ibmap_idx; 1186 } 1187 ext4fs_bg_free_inodes_dec(bgd, fs); 1188 if (has_gdt_chksum) 1189 bgd->bg_itable_unused = bgd->free_inodes; 1190 ext4fs_sb_free_inodes_dec(fs->sb); 1191 goto success; 1192 } 1193 1194 success: 1195 free(journal_buffer); 1196 free(zero_buffer); 1197 1198 return fs->curr_inode_no; 1199 fail: 1200 free(journal_buffer); 1201 free(zero_buffer); 1202 1203 return -1; 1204 1205 } 1206 1207 1208 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1209 unsigned int *total_remaining_blocks, 1210 unsigned int *no_blks_reqd) 1211 { 1212 short i; 1213 short status; 1214 long int actual_block_no; 1215 long int si_blockno; 1216 /* si :single indirect */ 1217 __le32 *si_buffer = NULL; 1218 __le32 *si_start_addr = NULL; 1219 struct ext_filesystem *fs = get_fs(); 1220 1221 if (*total_remaining_blocks != 0) { 1222 si_buffer = zalloc(fs->blksz); 1223 if (!si_buffer) { 1224 printf("No Memory\n"); 1225 return; 1226 } 1227 si_start_addr = si_buffer; 1228 si_blockno = ext4fs_get_new_blk_no(); 1229 if (si_blockno == -1) { 1230 printf("no block left to assign\n"); 1231 goto fail; 1232 } 1233 (*no_blks_reqd)++; 1234 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1235 1236 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1237 0, fs->blksz, (char *)si_buffer); 1238 memset(si_buffer, '\0', fs->blksz); 1239 if (status == 0) 1240 goto fail; 1241 1242 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1243 actual_block_no = ext4fs_get_new_blk_no(); 1244 if (actual_block_no == -1) { 1245 printf("no block left to assign\n"); 1246 goto fail; 1247 } 1248 *si_buffer = cpu_to_le32(actual_block_no); 1249 debug("SIAB %u: %u\n", *si_buffer, 1250 *total_remaining_blocks); 1251 1252 si_buffer++; 1253 (*total_remaining_blocks)--; 1254 if (*total_remaining_blocks == 0) 1255 break; 1256 } 1257 1258 /* write the block to disk */ 1259 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1260 si_start_addr, fs->blksz); 1261 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1262 } 1263 fail: 1264 free(si_start_addr); 1265 } 1266 1267 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1268 unsigned int *total_remaining_blocks, 1269 unsigned int *no_blks_reqd) 1270 { 1271 short i; 1272 short j; 1273 short status; 1274 long int actual_block_no; 1275 /* di:double indirect */ 1276 long int di_blockno_parent; 1277 long int di_blockno_child; 1278 __le32 *di_parent_buffer = NULL; 1279 __le32 *di_child_buff = NULL; 1280 __le32 *di_block_start_addr = NULL; 1281 __le32 *di_child_buff_start = NULL; 1282 struct ext_filesystem *fs = get_fs(); 1283 1284 if (*total_remaining_blocks != 0) { 1285 /* double indirect parent block connecting to inode */ 1286 di_blockno_parent = ext4fs_get_new_blk_no(); 1287 if (di_blockno_parent == -1) { 1288 printf("no block left to assign\n"); 1289 goto fail; 1290 } 1291 di_parent_buffer = zalloc(fs->blksz); 1292 if (!di_parent_buffer) 1293 goto fail; 1294 1295 di_block_start_addr = di_parent_buffer; 1296 (*no_blks_reqd)++; 1297 debug("DIPB %ld: %u\n", di_blockno_parent, 1298 *total_remaining_blocks); 1299 1300 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1301 fs->sect_perblk, 0, 1302 fs->blksz, (char *)di_parent_buffer); 1303 1304 if (!status) { 1305 printf("%s: Device read error!\n", __func__); 1306 goto fail; 1307 } 1308 memset(di_parent_buffer, '\0', fs->blksz); 1309 1310 /* 1311 * start:for each double indirect parent 1312 * block create one more block 1313 */ 1314 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1315 di_blockno_child = ext4fs_get_new_blk_no(); 1316 if (di_blockno_child == -1) { 1317 printf("no block left to assign\n"); 1318 goto fail; 1319 } 1320 di_child_buff = zalloc(fs->blksz); 1321 if (!di_child_buff) 1322 goto fail; 1323 1324 di_child_buff_start = di_child_buff; 1325 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1326 di_parent_buffer++; 1327 (*no_blks_reqd)++; 1328 debug("DICB %ld: %u\n", di_blockno_child, 1329 *total_remaining_blocks); 1330 1331 status = ext4fs_devread((lbaint_t)di_blockno_child * 1332 fs->sect_perblk, 0, 1333 fs->blksz, 1334 (char *)di_child_buff); 1335 1336 if (!status) { 1337 printf("%s: Device read error!\n", __func__); 1338 goto fail; 1339 } 1340 memset(di_child_buff, '\0', fs->blksz); 1341 /* filling of actual datablocks for each child */ 1342 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1343 actual_block_no = ext4fs_get_new_blk_no(); 1344 if (actual_block_no == -1) { 1345 printf("no block left to assign\n"); 1346 goto fail; 1347 } 1348 *di_child_buff = cpu_to_le32(actual_block_no); 1349 debug("DIAB %ld: %u\n", actual_block_no, 1350 *total_remaining_blocks); 1351 1352 di_child_buff++; 1353 (*total_remaining_blocks)--; 1354 if (*total_remaining_blocks == 0) 1355 break; 1356 } 1357 /* write the block table */ 1358 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1359 di_child_buff_start, fs->blksz); 1360 free(di_child_buff_start); 1361 di_child_buff_start = NULL; 1362 1363 if (*total_remaining_blocks == 0) 1364 break; 1365 } 1366 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1367 di_block_start_addr, fs->blksz); 1368 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1369 } 1370 fail: 1371 free(di_block_start_addr); 1372 } 1373 1374 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1375 unsigned int *total_remaining_blocks, 1376 unsigned int *no_blks_reqd) 1377 { 1378 short i; 1379 short j; 1380 short k; 1381 long int actual_block_no; 1382 /* ti: Triple Indirect */ 1383 long int ti_gp_blockno; 1384 long int ti_parent_blockno; 1385 long int ti_child_blockno; 1386 __le32 *ti_gp_buff = NULL; 1387 __le32 *ti_parent_buff = NULL; 1388 __le32 *ti_child_buff = NULL; 1389 __le32 *ti_gp_buff_start_addr = NULL; 1390 __le32 *ti_pbuff_start_addr = NULL; 1391 __le32 *ti_cbuff_start_addr = NULL; 1392 struct ext_filesystem *fs = get_fs(); 1393 if (*total_remaining_blocks != 0) { 1394 /* triple indirect grand parent block connecting to inode */ 1395 ti_gp_blockno = ext4fs_get_new_blk_no(); 1396 if (ti_gp_blockno == -1) { 1397 printf("no block left to assign\n"); 1398 return; 1399 } 1400 ti_gp_buff = zalloc(fs->blksz); 1401 if (!ti_gp_buff) 1402 return; 1403 1404 ti_gp_buff_start_addr = ti_gp_buff; 1405 (*no_blks_reqd)++; 1406 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1407 *total_remaining_blocks); 1408 1409 /* for each 4 byte grand parent entry create one more block */ 1410 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1411 ti_parent_blockno = ext4fs_get_new_blk_no(); 1412 if (ti_parent_blockno == -1) { 1413 printf("no block left to assign\n"); 1414 goto fail; 1415 } 1416 ti_parent_buff = zalloc(fs->blksz); 1417 if (!ti_parent_buff) 1418 goto fail; 1419 1420 ti_pbuff_start_addr = ti_parent_buff; 1421 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1422 ti_gp_buff++; 1423 (*no_blks_reqd)++; 1424 debug("TIPB %ld: %u\n", ti_parent_blockno, 1425 *total_remaining_blocks); 1426 1427 /* for each 4 byte entry parent create one more block */ 1428 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1429 ti_child_blockno = ext4fs_get_new_blk_no(); 1430 if (ti_child_blockno == -1) { 1431 printf("no block left assign\n"); 1432 goto fail1; 1433 } 1434 ti_child_buff = zalloc(fs->blksz); 1435 if (!ti_child_buff) 1436 goto fail1; 1437 1438 ti_cbuff_start_addr = ti_child_buff; 1439 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1440 ti_parent_buff++; 1441 (*no_blks_reqd)++; 1442 debug("TICB %ld: %u\n", ti_parent_blockno, 1443 *total_remaining_blocks); 1444 1445 /* fill actual datablocks for each child */ 1446 for (k = 0; k < (fs->blksz / sizeof(int)); 1447 k++) { 1448 actual_block_no = 1449 ext4fs_get_new_blk_no(); 1450 if (actual_block_no == -1) { 1451 printf("no block left\n"); 1452 free(ti_cbuff_start_addr); 1453 goto fail1; 1454 } 1455 *ti_child_buff = cpu_to_le32(actual_block_no); 1456 debug("TIAB %ld: %u\n", actual_block_no, 1457 *total_remaining_blocks); 1458 1459 ti_child_buff++; 1460 (*total_remaining_blocks)--; 1461 if (*total_remaining_blocks == 0) 1462 break; 1463 } 1464 /* write the child block */ 1465 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1466 (uint64_t)fs->blksz)), 1467 ti_cbuff_start_addr, fs->blksz); 1468 free(ti_cbuff_start_addr); 1469 1470 if (*total_remaining_blocks == 0) 1471 break; 1472 } 1473 /* write the parent block */ 1474 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1475 ti_pbuff_start_addr, fs->blksz); 1476 free(ti_pbuff_start_addr); 1477 1478 if (*total_remaining_blocks == 0) 1479 break; 1480 } 1481 /* write the grand parent block */ 1482 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1483 ti_gp_buff_start_addr, fs->blksz); 1484 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1485 free(ti_gp_buff_start_addr); 1486 return; 1487 } 1488 fail1: 1489 free(ti_pbuff_start_addr); 1490 fail: 1491 free(ti_gp_buff_start_addr); 1492 } 1493 1494 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1495 unsigned int total_remaining_blocks, 1496 unsigned int *total_no_of_block) 1497 { 1498 short i; 1499 long int direct_blockno; 1500 unsigned int no_blks_reqd = 0; 1501 1502 /* allocation of direct blocks */ 1503 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1504 direct_blockno = ext4fs_get_new_blk_no(); 1505 if (direct_blockno == -1) { 1506 printf("no block left to assign\n"); 1507 return; 1508 } 1509 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1510 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1511 1512 total_remaining_blocks--; 1513 } 1514 1515 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1516 &no_blks_reqd); 1517 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1518 &no_blks_reqd); 1519 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1520 &no_blks_reqd); 1521 *total_no_of_block += no_blks_reqd; 1522 } 1523 1524 #endif 1525 1526 static struct ext4_extent_header *ext4fs_get_extent_block 1527 (struct ext2_data *data, char *buf, 1528 struct ext4_extent_header *ext_block, 1529 uint32_t fileblock, int log2_blksz) 1530 { 1531 struct ext4_extent_idx *index; 1532 unsigned long long block; 1533 int blksz = EXT2_BLOCK_SIZE(data); 1534 int i; 1535 1536 while (1) { 1537 index = (struct ext4_extent_idx *)(ext_block + 1); 1538 1539 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1540 return NULL; 1541 1542 if (ext_block->eh_depth == 0) 1543 return ext_block; 1544 i = -1; 1545 do { 1546 i++; 1547 if (i >= le16_to_cpu(ext_block->eh_entries)) 1548 break; 1549 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1550 1551 if (--i < 0) 1552 return NULL; 1553 1554 block = le16_to_cpu(index[i].ei_leaf_hi); 1555 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1556 1557 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1558 buf)) 1559 ext_block = (struct ext4_extent_header *)buf; 1560 else 1561 return NULL; 1562 } 1563 } 1564 1565 static int ext4fs_blockgroup 1566 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1567 { 1568 long int blkno; 1569 unsigned int blkoff, desc_per_blk; 1570 int log2blksz = get_fs()->dev_desc->log2blksz; 1571 int desc_size = get_fs()->gdsize; 1572 1573 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1574 1575 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1576 group / desc_per_blk; 1577 blkoff = (group % desc_per_blk) * desc_size; 1578 1579 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1580 group, blkno, blkoff); 1581 1582 return ext4fs_devread((lbaint_t)blkno << 1583 (LOG2_BLOCK_SIZE(data) - log2blksz), 1584 blkoff, desc_size, (char *)blkgrp); 1585 } 1586 1587 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1588 { 1589 struct ext2_block_group blkgrp; 1590 struct ext2_sblock *sblock = &data->sblock; 1591 struct ext_filesystem *fs = get_fs(); 1592 int log2blksz = get_fs()->dev_desc->log2blksz; 1593 int inodes_per_block, status; 1594 long int blkno; 1595 unsigned int blkoff; 1596 1597 /* It is easier to calculate if the first inode is 0. */ 1598 ino--; 1599 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1600 (sblock->inodes_per_group), &blkgrp); 1601 if (status == 0) 1602 return 0; 1603 1604 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1605 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1606 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1607 blkoff = (ino % inodes_per_block) * fs->inodesz; 1608 /* Read the inode. */ 1609 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1610 log2blksz), blkoff, 1611 sizeof(struct ext2_inode), (char *)inode); 1612 if (status == 0) 1613 return 0; 1614 1615 return 1; 1616 } 1617 1618 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1619 { 1620 long int blknr; 1621 int blksz; 1622 int log2_blksz; 1623 int status; 1624 long int rblock; 1625 long int perblock_parent; 1626 long int perblock_child; 1627 unsigned long long start; 1628 /* get the blocksize of the filesystem */ 1629 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1630 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1631 - get_fs()->dev_desc->log2blksz; 1632 1633 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1634 long int startblock, endblock; 1635 char *buf = zalloc(blksz); 1636 if (!buf) 1637 return -ENOMEM; 1638 struct ext4_extent_header *ext_block; 1639 struct ext4_extent *extent; 1640 int i; 1641 ext_block = 1642 ext4fs_get_extent_block(ext4fs_root, buf, 1643 (struct ext4_extent_header *) 1644 inode->b.blocks.dir_blocks, 1645 fileblock, log2_blksz); 1646 if (!ext_block) { 1647 printf("invalid extent block\n"); 1648 free(buf); 1649 return -EINVAL; 1650 } 1651 1652 extent = (struct ext4_extent *)(ext_block + 1); 1653 1654 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { 1655 startblock = le32_to_cpu(extent[i].ee_block); 1656 endblock = startblock + le16_to_cpu(extent[i].ee_len); 1657 1658 if (startblock > fileblock) { 1659 /* Sparse file */ 1660 free(buf); 1661 return 0; 1662 1663 } else if (fileblock < endblock) { 1664 start = le16_to_cpu(extent[i].ee_start_hi); 1665 start = (start << 32) + 1666 le32_to_cpu(extent[i].ee_start_lo); 1667 free(buf); 1668 return (fileblock - startblock) + start; 1669 } 1670 } 1671 1672 free(buf); 1673 return 0; 1674 } 1675 1676 /* Direct blocks. */ 1677 if (fileblock < INDIRECT_BLOCKS) 1678 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1679 1680 /* Indirect. */ 1681 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1682 if (ext4fs_indir1_block == NULL) { 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 ext4fs_indir1_blkno = -1; 1691 } 1692 if (blksz != ext4fs_indir1_size) { 1693 free(ext4fs_indir1_block); 1694 ext4fs_indir1_block = NULL; 1695 ext4fs_indir1_size = 0; 1696 ext4fs_indir1_blkno = -1; 1697 ext4fs_indir1_block = zalloc(blksz); 1698 if (ext4fs_indir1_block == NULL) { 1699 printf("** SI ext2fs read block (indir 1):" 1700 "malloc failed. **\n"); 1701 return -1; 1702 } 1703 ext4fs_indir1_size = blksz; 1704 } 1705 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1706 log2_blksz) != ext4fs_indir1_blkno) { 1707 status = 1708 ext4fs_devread((lbaint_t)le32_to_cpu 1709 (inode->b.blocks. 1710 indir_block) << log2_blksz, 0, 1711 blksz, (char *)ext4fs_indir1_block); 1712 if (status == 0) { 1713 printf("** SI ext2fs read block (indir 1)" 1714 "failed. **\n"); 1715 return -1; 1716 } 1717 ext4fs_indir1_blkno = 1718 le32_to_cpu(inode->b.blocks. 1719 indir_block) << log2_blksz; 1720 } 1721 blknr = le32_to_cpu(ext4fs_indir1_block 1722 [fileblock - INDIRECT_BLOCKS]); 1723 } 1724 /* Double indirect. */ 1725 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1726 (blksz / 4 + 1)))) { 1727 1728 long int perblock = blksz / 4; 1729 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1730 1731 if (ext4fs_indir1_block == NULL) { 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 ext4fs_indir1_blkno = -1; 1740 } 1741 if (blksz != ext4fs_indir1_size) { 1742 free(ext4fs_indir1_block); 1743 ext4fs_indir1_block = NULL; 1744 ext4fs_indir1_size = 0; 1745 ext4fs_indir1_blkno = -1; 1746 ext4fs_indir1_block = zalloc(blksz); 1747 if (ext4fs_indir1_block == NULL) { 1748 printf("** DI ext2fs read block (indir 2 1)" 1749 "malloc failed. **\n"); 1750 return -1; 1751 } 1752 ext4fs_indir1_size = blksz; 1753 } 1754 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1755 log2_blksz) != ext4fs_indir1_blkno) { 1756 status = 1757 ext4fs_devread((lbaint_t)le32_to_cpu 1758 (inode->b.blocks. 1759 double_indir_block) << log2_blksz, 1760 0, blksz, 1761 (char *)ext4fs_indir1_block); 1762 if (status == 0) { 1763 printf("** DI ext2fs read block (indir 2 1)" 1764 "failed. **\n"); 1765 return -1; 1766 } 1767 ext4fs_indir1_blkno = 1768 le32_to_cpu(inode->b.blocks.double_indir_block) << 1769 log2_blksz; 1770 } 1771 1772 if (ext4fs_indir2_block == NULL) { 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 ext4fs_indir2_blkno = -1; 1781 } 1782 if (blksz != ext4fs_indir2_size) { 1783 free(ext4fs_indir2_block); 1784 ext4fs_indir2_block = NULL; 1785 ext4fs_indir2_size = 0; 1786 ext4fs_indir2_blkno = -1; 1787 ext4fs_indir2_block = zalloc(blksz); 1788 if (ext4fs_indir2_block == NULL) { 1789 printf("** DI ext2fs read block (indir 2 2)" 1790 "malloc failed. **\n"); 1791 return -1; 1792 } 1793 ext4fs_indir2_size = blksz; 1794 } 1795 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1796 log2_blksz) != ext4fs_indir2_blkno) { 1797 status = ext4fs_devread((lbaint_t)le32_to_cpu 1798 (ext4fs_indir1_block 1799 [rblock / 1800 perblock]) << log2_blksz, 0, 1801 blksz, 1802 (char *)ext4fs_indir2_block); 1803 if (status == 0) { 1804 printf("** DI ext2fs read block (indir 2 2)" 1805 "failed. **\n"); 1806 return -1; 1807 } 1808 ext4fs_indir2_blkno = 1809 le32_to_cpu(ext4fs_indir1_block[rblock 1810 / 1811 perblock]) << 1812 log2_blksz; 1813 } 1814 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1815 } 1816 /* Tripple indirect. */ 1817 else { 1818 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1819 (blksz / 4 * blksz / 4)); 1820 perblock_child = blksz / 4; 1821 perblock_parent = ((blksz / 4) * (blksz / 4)); 1822 1823 if (ext4fs_indir1_block == NULL) { 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 ext4fs_indir1_blkno = -1; 1832 } 1833 if (blksz != ext4fs_indir1_size) { 1834 free(ext4fs_indir1_block); 1835 ext4fs_indir1_block = NULL; 1836 ext4fs_indir1_size = 0; 1837 ext4fs_indir1_blkno = -1; 1838 ext4fs_indir1_block = zalloc(blksz); 1839 if (ext4fs_indir1_block == NULL) { 1840 printf("** TI ext2fs read block (indir 2 1)" 1841 "malloc failed. **\n"); 1842 return -1; 1843 } 1844 ext4fs_indir1_size = blksz; 1845 } 1846 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1847 log2_blksz) != ext4fs_indir1_blkno) { 1848 status = ext4fs_devread 1849 ((lbaint_t) 1850 le32_to_cpu(inode->b.blocks.triple_indir_block) 1851 << log2_blksz, 0, blksz, 1852 (char *)ext4fs_indir1_block); 1853 if (status == 0) { 1854 printf("** TI ext2fs read block (indir 2 1)" 1855 "failed. **\n"); 1856 return -1; 1857 } 1858 ext4fs_indir1_blkno = 1859 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1860 log2_blksz; 1861 } 1862 1863 if (ext4fs_indir2_block == NULL) { 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 ext4fs_indir2_blkno = -1; 1872 } 1873 if (blksz != ext4fs_indir2_size) { 1874 free(ext4fs_indir2_block); 1875 ext4fs_indir2_block = NULL; 1876 ext4fs_indir2_size = 0; 1877 ext4fs_indir2_blkno = -1; 1878 ext4fs_indir2_block = zalloc(blksz); 1879 if (ext4fs_indir2_block == NULL) { 1880 printf("** TI ext2fs read block (indir 2 2)" 1881 "malloc failed. **\n"); 1882 return -1; 1883 } 1884 ext4fs_indir2_size = blksz; 1885 } 1886 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1887 perblock_parent]) << 1888 log2_blksz) 1889 != ext4fs_indir2_blkno) { 1890 status = ext4fs_devread((lbaint_t)le32_to_cpu 1891 (ext4fs_indir1_block 1892 [rblock / 1893 perblock_parent]) << 1894 log2_blksz, 0, blksz, 1895 (char *)ext4fs_indir2_block); 1896 if (status == 0) { 1897 printf("** TI ext2fs read block (indir 2 2)" 1898 "failed. **\n"); 1899 return -1; 1900 } 1901 ext4fs_indir2_blkno = 1902 le32_to_cpu(ext4fs_indir1_block[rblock / 1903 perblock_parent]) 1904 << log2_blksz; 1905 } 1906 1907 if (ext4fs_indir3_block == NULL) { 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 ext4fs_indir3_blkno = -1; 1916 } 1917 if (blksz != ext4fs_indir3_size) { 1918 free(ext4fs_indir3_block); 1919 ext4fs_indir3_block = NULL; 1920 ext4fs_indir3_size = 0; 1921 ext4fs_indir3_blkno = -1; 1922 ext4fs_indir3_block = zalloc(blksz); 1923 if (ext4fs_indir3_block == NULL) { 1924 printf("** TI ext2fs read block (indir 2 2)" 1925 "malloc failed. **\n"); 1926 return -1; 1927 } 1928 ext4fs_indir3_size = blksz; 1929 } 1930 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1931 / 1932 perblock_child]) << 1933 log2_blksz) != ext4fs_indir3_blkno) { 1934 status = 1935 ext4fs_devread((lbaint_t)le32_to_cpu 1936 (ext4fs_indir2_block 1937 [(rblock / perblock_child) 1938 % (blksz / 4)]) << log2_blksz, 0, 1939 blksz, (char *)ext4fs_indir3_block); 1940 if (status == 0) { 1941 printf("** TI ext2fs read block (indir 2 2)" 1942 "failed. **\n"); 1943 return -1; 1944 } 1945 ext4fs_indir3_blkno = 1946 le32_to_cpu(ext4fs_indir2_block[(rblock / 1947 perblock_child) % 1948 (blksz / 1949 4)]) << 1950 log2_blksz; 1951 } 1952 1953 blknr = le32_to_cpu(ext4fs_indir3_block 1954 [rblock % perblock_child]); 1955 } 1956 debug("read_allocated_block %ld\n", blknr); 1957 1958 return blknr; 1959 } 1960 1961 /** 1962 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1963 * global pointers 1964 * 1965 * This function assures that for a file with the same name but different size 1966 * the sequential store on the ext4 filesystem will be correct. 1967 * 1968 * In this function the global data, responsible for internal representation 1969 * of the ext4 data are initialized to the reset state. Without this, during 1970 * replacement of the smaller file with the bigger truncation of new file was 1971 * performed. 1972 */ 1973 void ext4fs_reinit_global(void) 1974 { 1975 if (ext4fs_indir1_block != NULL) { 1976 free(ext4fs_indir1_block); 1977 ext4fs_indir1_block = NULL; 1978 ext4fs_indir1_size = 0; 1979 ext4fs_indir1_blkno = -1; 1980 } 1981 if (ext4fs_indir2_block != NULL) { 1982 free(ext4fs_indir2_block); 1983 ext4fs_indir2_block = NULL; 1984 ext4fs_indir2_size = 0; 1985 ext4fs_indir2_blkno = -1; 1986 } 1987 if (ext4fs_indir3_block != NULL) { 1988 free(ext4fs_indir3_block); 1989 ext4fs_indir3_block = NULL; 1990 ext4fs_indir3_size = 0; 1991 ext4fs_indir3_blkno = -1; 1992 } 1993 } 1994 void ext4fs_close(void) 1995 { 1996 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1997 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1998 ext4fs_file = NULL; 1999 } 2000 if (ext4fs_root != NULL) { 2001 free(ext4fs_root); 2002 ext4fs_root = NULL; 2003 } 2004 2005 ext4fs_reinit_global(); 2006 } 2007 2008 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 2009 struct ext2fs_node **fnode, int *ftype) 2010 { 2011 unsigned int fpos = 0; 2012 int status; 2013 loff_t actread; 2014 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 2015 2016 #ifdef DEBUG 2017 if (name != NULL) 2018 printf("Iterate dir %s\n", name); 2019 #endif /* of DEBUG */ 2020 if (!diro->inode_read) { 2021 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2022 if (status == 0) 2023 return 0; 2024 } 2025 /* Search the file. */ 2026 while (fpos < le32_to_cpu(diro->inode.size)) { 2027 struct ext2_dirent dirent; 2028 2029 status = ext4fs_read_file(diro, fpos, 2030 sizeof(struct ext2_dirent), 2031 (char *)&dirent, &actread); 2032 if (status < 0) 2033 return 0; 2034 2035 if (dirent.direntlen == 0) { 2036 printf("Failed to iterate over directory %s\n", name); 2037 return 0; 2038 } 2039 2040 if (dirent.namelen != 0) { 2041 char filename[dirent.namelen + 1]; 2042 struct ext2fs_node *fdiro; 2043 int type = FILETYPE_UNKNOWN; 2044 2045 status = ext4fs_read_file(diro, 2046 fpos + 2047 sizeof(struct ext2_dirent), 2048 dirent.namelen, filename, 2049 &actread); 2050 if (status < 0) 2051 return 0; 2052 2053 fdiro = zalloc(sizeof(struct ext2fs_node)); 2054 if (!fdiro) 2055 return 0; 2056 2057 fdiro->data = diro->data; 2058 fdiro->ino = le32_to_cpu(dirent.inode); 2059 2060 filename[dirent.namelen] = '\0'; 2061 2062 if (dirent.filetype != FILETYPE_UNKNOWN) { 2063 fdiro->inode_read = 0; 2064 2065 if (dirent.filetype == FILETYPE_DIRECTORY) 2066 type = FILETYPE_DIRECTORY; 2067 else if (dirent.filetype == FILETYPE_SYMLINK) 2068 type = FILETYPE_SYMLINK; 2069 else if (dirent.filetype == FILETYPE_REG) 2070 type = FILETYPE_REG; 2071 } else { 2072 status = ext4fs_read_inode(diro->data, 2073 le32_to_cpu 2074 (dirent.inode), 2075 &fdiro->inode); 2076 if (status == 0) { 2077 free(fdiro); 2078 return 0; 2079 } 2080 fdiro->inode_read = 1; 2081 2082 if ((le16_to_cpu(fdiro->inode.mode) & 2083 FILETYPE_INO_MASK) == 2084 FILETYPE_INO_DIRECTORY) { 2085 type = FILETYPE_DIRECTORY; 2086 } else if ((le16_to_cpu(fdiro->inode.mode) 2087 & FILETYPE_INO_MASK) == 2088 FILETYPE_INO_SYMLINK) { 2089 type = FILETYPE_SYMLINK; 2090 } else if ((le16_to_cpu(fdiro->inode.mode) 2091 & FILETYPE_INO_MASK) == 2092 FILETYPE_INO_REG) { 2093 type = FILETYPE_REG; 2094 } 2095 } 2096 #ifdef DEBUG 2097 printf("iterate >%s<\n", filename); 2098 #endif /* of DEBUG */ 2099 if ((name != NULL) && (fnode != NULL) 2100 && (ftype != NULL)) { 2101 if (strcmp(filename, name) == 0) { 2102 *ftype = type; 2103 *fnode = fdiro; 2104 return 1; 2105 } 2106 } else { 2107 if (fdiro->inode_read == 0) { 2108 status = ext4fs_read_inode(diro->data, 2109 le32_to_cpu( 2110 dirent.inode), 2111 &fdiro->inode); 2112 if (status == 0) { 2113 free(fdiro); 2114 return 0; 2115 } 2116 fdiro->inode_read = 1; 2117 } 2118 switch (type) { 2119 case FILETYPE_DIRECTORY: 2120 printf("<DIR> "); 2121 break; 2122 case FILETYPE_SYMLINK: 2123 printf("<SYM> "); 2124 break; 2125 case FILETYPE_REG: 2126 printf(" "); 2127 break; 2128 default: 2129 printf("< ? > "); 2130 break; 2131 } 2132 printf("%10u %s\n", 2133 le32_to_cpu(fdiro->inode.size), 2134 filename); 2135 } 2136 free(fdiro); 2137 } 2138 fpos += le16_to_cpu(dirent.direntlen); 2139 } 2140 return 0; 2141 } 2142 2143 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2144 { 2145 char *symlink; 2146 struct ext2fs_node *diro = node; 2147 int status; 2148 loff_t actread; 2149 2150 if (!diro->inode_read) { 2151 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2152 if (status == 0) 2153 return NULL; 2154 } 2155 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2156 if (!symlink) 2157 return NULL; 2158 2159 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2160 strncpy(symlink, diro->inode.b.symlink, 2161 le32_to_cpu(diro->inode.size)); 2162 } else { 2163 status = ext4fs_read_file(diro, 0, 2164 le32_to_cpu(diro->inode.size), 2165 symlink, &actread); 2166 if ((status < 0) || (actread == 0)) { 2167 free(symlink); 2168 return NULL; 2169 } 2170 } 2171 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2172 return symlink; 2173 } 2174 2175 static int ext4fs_find_file1(const char *currpath, 2176 struct ext2fs_node *currroot, 2177 struct ext2fs_node **currfound, int *foundtype) 2178 { 2179 char fpath[strlen(currpath) + 1]; 2180 char *name = fpath; 2181 char *next; 2182 int status; 2183 int type = FILETYPE_DIRECTORY; 2184 struct ext2fs_node *currnode = currroot; 2185 struct ext2fs_node *oldnode = currroot; 2186 2187 strncpy(fpath, currpath, strlen(currpath) + 1); 2188 2189 /* Remove all leading slashes. */ 2190 while (*name == '/') 2191 name++; 2192 2193 if (!*name) { 2194 *currfound = currnode; 2195 return 1; 2196 } 2197 2198 for (;;) { 2199 int found; 2200 2201 /* Extract the actual part from the pathname. */ 2202 next = strchr(name, '/'); 2203 if (next) { 2204 /* Remove all leading slashes. */ 2205 while (*next == '/') 2206 *(next++) = '\0'; 2207 } 2208 2209 if (type != FILETYPE_DIRECTORY) { 2210 ext4fs_free_node(currnode, currroot); 2211 return 0; 2212 } 2213 2214 oldnode = currnode; 2215 2216 /* Iterate over the directory. */ 2217 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2218 if (found == 0) 2219 return 0; 2220 2221 if (found == -1) 2222 break; 2223 2224 /* Read in the symlink and follow it. */ 2225 if (type == FILETYPE_SYMLINK) { 2226 char *symlink; 2227 2228 /* Test if the symlink does not loop. */ 2229 if (++symlinknest == 8) { 2230 ext4fs_free_node(currnode, currroot); 2231 ext4fs_free_node(oldnode, currroot); 2232 return 0; 2233 } 2234 2235 symlink = ext4fs_read_symlink(currnode); 2236 ext4fs_free_node(currnode, currroot); 2237 2238 if (!symlink) { 2239 ext4fs_free_node(oldnode, currroot); 2240 return 0; 2241 } 2242 2243 debug("Got symlink >%s<\n", symlink); 2244 2245 if (symlink[0] == '/') { 2246 ext4fs_free_node(oldnode, currroot); 2247 oldnode = &ext4fs_root->diropen; 2248 } 2249 2250 /* Lookup the node the symlink points to. */ 2251 status = ext4fs_find_file1(symlink, oldnode, 2252 &currnode, &type); 2253 2254 free(symlink); 2255 2256 if (status == 0) { 2257 ext4fs_free_node(oldnode, currroot); 2258 return 0; 2259 } 2260 } 2261 2262 ext4fs_free_node(oldnode, currroot); 2263 2264 /* Found the node! */ 2265 if (!next || *next == '\0') { 2266 *currfound = currnode; 2267 *foundtype = type; 2268 return 1; 2269 } 2270 name = next; 2271 } 2272 return -1; 2273 } 2274 2275 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2276 struct ext2fs_node **foundnode, int expecttype) 2277 { 2278 int status; 2279 int foundtype = FILETYPE_DIRECTORY; 2280 2281 symlinknest = 0; 2282 if (!path) 2283 return 0; 2284 2285 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2286 if (status == 0) 2287 return 0; 2288 2289 /* Check if the node that was found was of the expected type. */ 2290 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2291 return 0; 2292 else if ((expecttype == FILETYPE_DIRECTORY) 2293 && (foundtype != expecttype)) 2294 return 0; 2295 2296 return 1; 2297 } 2298 2299 int ext4fs_open(const char *filename, loff_t *len) 2300 { 2301 struct ext2fs_node *fdiro = NULL; 2302 int status; 2303 2304 if (ext4fs_root == NULL) 2305 return -1; 2306 2307 ext4fs_file = NULL; 2308 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2309 FILETYPE_REG); 2310 if (status == 0) 2311 goto fail; 2312 2313 if (!fdiro->inode_read) { 2314 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2315 &fdiro->inode); 2316 if (status == 0) 2317 goto fail; 2318 } 2319 *len = le32_to_cpu(fdiro->inode.size); 2320 ext4fs_file = fdiro; 2321 2322 return 0; 2323 fail: 2324 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2325 2326 return -1; 2327 } 2328 2329 int ext4fs_mount(unsigned part_length) 2330 { 2331 struct ext2_data *data; 2332 int status; 2333 struct ext_filesystem *fs = get_fs(); 2334 data = zalloc(SUPERBLOCK_SIZE); 2335 if (!data) 2336 return 0; 2337 2338 /* Read the superblock. */ 2339 status = ext4_read_superblock((char *)&data->sblock); 2340 2341 if (status == 0) 2342 goto fail; 2343 2344 /* Make sure this is an ext2 filesystem. */ 2345 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2346 goto fail_noerr; 2347 2348 2349 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2350 fs->inodesz = 128; 2351 fs->gdsize = 32; 2352 } else { 2353 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2354 __le32_to_cpu(data->sblock.feature_compatibility), 2355 __le32_to_cpu(data->sblock.feature_incompat), 2356 __le32_to_cpu(data->sblock.feature_ro_compat)); 2357 2358 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2359 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2360 EXT4_FEATURE_INCOMPAT_64BIT ? 2361 le16_to_cpu(data->sblock.descriptor_size) : 32; 2362 } 2363 2364 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2365 le32_to_cpu(data->sblock.revision_level), 2366 fs->inodesz, fs->gdsize); 2367 2368 data->diropen.data = data; 2369 data->diropen.ino = 2; 2370 data->diropen.inode_read = 1; 2371 data->inode = &data->diropen.inode; 2372 2373 status = ext4fs_read_inode(data, 2, data->inode); 2374 if (status == 0) 2375 goto fail; 2376 2377 ext4fs_root = data; 2378 2379 return 1; 2380 fail: 2381 printf("Failed to mount ext2 filesystem...\n"); 2382 fail_noerr: 2383 free(data); 2384 ext4fs_root = NULL; 2385 2386 return 0; 2387 } 2388