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 dir = (struct ext2_dirent *)(block_buffer + offset); 664 direntname = (char*)(dir) + sizeof(struct ext2_dirent); 665 666 int direntlen = le16_to_cpu(dir->direntlen); 667 if (direntlen < sizeof(struct ext2_dirent)) 668 break; 669 670 if (dir->inode && (strlen(dirname) == dir->namelen) && 671 (strncmp(dirname, direntname, dir->namelen) == 0)) { 672 inodeno = le32_to_cpu(dir->inode); 673 break; 674 } 675 676 offset += direntlen; 677 678 } while (offset < fs->blksz); 679 680 if (inodeno > 0) { 681 free(block_buffer); 682 return inodeno; 683 } 684 } 685 686 fail: 687 free(block_buffer); 688 689 return -1; 690 } 691 692 static int find_dir_depth(char *dirname) 693 { 694 char *token = strtok(dirname, "/"); 695 int count = 0; 696 while (token != NULL) { 697 token = strtok(NULL, "/"); 698 count++; 699 } 700 return count + 1 + 1; 701 /* 702 * for example for string /home/temp 703 * depth=home(1)+temp(1)+1 extra for NULL; 704 * so count is 4; 705 */ 706 } 707 708 static int parse_path(char **arr, char *dirname) 709 { 710 char *token = strtok(dirname, "/"); 711 int i = 0; 712 713 /* add root */ 714 arr[i] = zalloc(strlen("/") + 1); 715 if (!arr[i]) 716 return -ENOMEM; 717 memcpy(arr[i++], "/", strlen("/")); 718 719 /* add each path entry after root */ 720 while (token != NULL) { 721 arr[i] = zalloc(strlen(token) + 1); 722 if (!arr[i]) 723 return -ENOMEM; 724 memcpy(arr[i++], token, strlen(token)); 725 token = strtok(NULL, "/"); 726 } 727 arr[i] = NULL; 728 729 return 0; 730 } 731 732 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 733 { 734 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 735 return -1; 736 737 return 0; 738 } 739 740 /* 741 * Function: ext4fs_get_parent_inode_num 742 * Return Value: inode Number of the parent directory of file/Directory to be 743 * created 744 * dirname : Input parmater, input path name of the file/directory to be created 745 * dname : Output parameter, to be filled with the name of the directory 746 * extracted from dirname 747 */ 748 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 749 { 750 int i; 751 int depth = 0; 752 int matched_inode_no; 753 int result_inode_no = -1; 754 char **ptr = NULL; 755 char *depth_dirname = NULL; 756 char *parse_dirname = NULL; 757 struct ext2_inode *parent_inode = NULL; 758 struct ext2_inode *first_inode = NULL; 759 struct ext2_inode temp_inode; 760 761 if (*dirname != '/') { 762 printf("Please supply Absolute path\n"); 763 return -1; 764 } 765 766 /* TODO: input validation make equivalent to linux */ 767 depth_dirname = zalloc(strlen(dirname) + 1); 768 if (!depth_dirname) 769 return -ENOMEM; 770 771 memcpy(depth_dirname, dirname, strlen(dirname)); 772 depth = find_dir_depth(depth_dirname); 773 parse_dirname = zalloc(strlen(dirname) + 1); 774 if (!parse_dirname) 775 goto fail; 776 memcpy(parse_dirname, dirname, strlen(dirname)); 777 778 /* allocate memory for each directory level */ 779 ptr = zalloc((depth) * sizeof(char *)); 780 if (!ptr) 781 goto fail; 782 if (parse_path(ptr, parse_dirname)) 783 goto fail; 784 parent_inode = zalloc(sizeof(struct ext2_inode)); 785 if (!parent_inode) 786 goto fail; 787 first_inode = zalloc(sizeof(struct ext2_inode)); 788 if (!first_inode) 789 goto fail; 790 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 791 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 792 if (flags & F_FILE) 793 result_inode_no = EXT2_ROOT_INO; 794 for (i = 1; i < depth; i++) { 795 matched_inode_no = search_dir(parent_inode, ptr[i]); 796 if (matched_inode_no == -1) { 797 if (ptr[i + 1] == NULL && i == 1) { 798 result_inode_no = EXT2_ROOT_INO; 799 goto end; 800 } else { 801 if (ptr[i + 1] == NULL) 802 break; 803 printf("Invalid path\n"); 804 result_inode_no = -1; 805 goto fail; 806 } 807 } else { 808 if (ptr[i + 1] != NULL) { 809 memset(parent_inode, '\0', 810 sizeof(struct ext2_inode)); 811 if (ext4fs_iget(matched_inode_no, 812 parent_inode)) { 813 result_inode_no = -1; 814 goto fail; 815 } 816 result_inode_no = matched_inode_no; 817 } else { 818 break; 819 } 820 } 821 } 822 823 end: 824 if (i == 1) 825 matched_inode_no = search_dir(first_inode, ptr[i]); 826 else 827 matched_inode_no = search_dir(parent_inode, ptr[i]); 828 829 if (matched_inode_no != -1) { 830 ext4fs_iget(matched_inode_no, &temp_inode); 831 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { 832 printf("It is a Directory\n"); 833 result_inode_no = -1; 834 goto fail; 835 } 836 } 837 838 if (strlen(ptr[i]) > 256) { 839 result_inode_no = -1; 840 goto fail; 841 } 842 memcpy(dname, ptr[i], strlen(ptr[i])); 843 844 fail: 845 free(depth_dirname); 846 free(parse_dirname); 847 for (i = 0; i < depth; i++) { 848 if (!ptr[i]) 849 break; 850 free(ptr[i]); 851 } 852 free(ptr); 853 free(parent_inode); 854 free(first_inode); 855 856 return result_inode_no; 857 } 858 859 static int unlink_filename(char *filename, unsigned int blknr) 860 { 861 int status; 862 int inodeno = 0; 863 int offset; 864 char *block_buffer = NULL; 865 struct ext2_dirent *dir = NULL; 866 struct ext2_dirent *previous_dir; 867 struct ext_filesystem *fs = get_fs(); 868 int ret = -1; 869 char *direntname; 870 871 block_buffer = zalloc(fs->blksz); 872 if (!block_buffer) 873 return -ENOMEM; 874 875 /* read the directory block */ 876 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 877 fs->blksz, block_buffer); 878 if (status == 0) 879 goto fail; 880 881 offset = 0; 882 do { 883 previous_dir = dir; 884 dir = (struct ext2_dirent *)(block_buffer + offset); 885 direntname = (char *)(dir) + sizeof(struct ext2_dirent); 886 887 int direntlen = le16_to_cpu(dir->direntlen); 888 if (direntlen < sizeof(struct ext2_dirent)) 889 break; 890 891 if (dir->inode && (strlen(filename) == dir->namelen) && 892 (strncmp(direntname, filename, dir->namelen) == 0)) { 893 inodeno = le32_to_cpu(dir->inode); 894 break; 895 } 896 897 offset += direntlen; 898 899 } while (offset < fs->blksz); 900 901 if (inodeno > 0) { 902 printf("file found, deleting\n"); 903 if (ext4fs_log_journal(block_buffer, blknr)) 904 goto fail; 905 906 if (previous_dir) { 907 /* merge dir entry with predecessor */ 908 uint16_t new_len; 909 new_len = le16_to_cpu(previous_dir->direntlen); 910 new_len += le16_to_cpu(dir->direntlen); 911 previous_dir->direntlen = cpu_to_le16(new_len); 912 } else { 913 /* invalidate dir entry */ 914 dir->inode = 0; 915 } 916 if (ext4fs_put_metadata(block_buffer, blknr)) 917 goto fail; 918 ret = inodeno; 919 } 920 fail: 921 free(block_buffer); 922 923 return ret; 924 } 925 926 int ext4fs_filename_unlink(char *filename) 927 { 928 int blk_idx; 929 long int blknr = -1; 930 int inodeno = -1; 931 uint32_t directory_blocks; 932 933 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 934 LOG2_BLOCK_SIZE(ext4fs_root); 935 936 /* read the block no allocated to a file */ 937 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 938 blknr = read_allocated_block(g_parent_inode, blk_idx); 939 if (blknr <= 0) 940 break; 941 inodeno = unlink_filename(filename, blknr); 942 if (inodeno != -1) 943 return inodeno; 944 } 945 946 return -1; 947 } 948 949 uint32_t ext4fs_get_new_blk_no(void) 950 { 951 short i; 952 short status; 953 int remainder; 954 unsigned int bg_idx; 955 static int prev_bg_bitmap_index = -1; 956 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 957 struct ext_filesystem *fs = get_fs(); 958 char *journal_buffer = zalloc(fs->blksz); 959 char *zero_buffer = zalloc(fs->blksz); 960 if (!journal_buffer || !zero_buffer) 961 goto fail; 962 963 if (fs->first_pass_bbmap == 0) { 964 for (i = 0; i < fs->no_blkgrp; i++) { 965 struct ext2_block_group *bgd = NULL; 966 bgd = ext4fs_get_group_descriptor(fs, i); 967 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 968 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 969 uint64_t b_bitmap_blk = 970 ext4fs_bg_get_block_id(bgd, fs); 971 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 972 memcpy(fs->blk_bmaps[i], zero_buffer, 973 fs->blksz); 974 put_ext4(b_bitmap_blk * fs->blksz, 975 fs->blk_bmaps[i], fs->blksz); 976 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 977 ext4fs_bg_set_flags(bgd, bg_flags); 978 } 979 fs->curr_blkno = 980 _get_new_blk_no(fs->blk_bmaps[i]); 981 if (fs->curr_blkno == -1) 982 /* block bitmap is completely filled */ 983 continue; 984 fs->curr_blkno = fs->curr_blkno + 985 (i * fs->blksz * 8); 986 fs->first_pass_bbmap++; 987 ext4fs_bg_free_blocks_dec(bgd, fs); 988 ext4fs_sb_free_blocks_dec(fs->sb); 989 status = ext4fs_devread(b_bitmap_blk * 990 fs->sect_perblk, 991 0, fs->blksz, 992 journal_buffer); 993 if (status == 0) 994 goto fail; 995 if (ext4fs_log_journal(journal_buffer, 996 b_bitmap_blk)) 997 goto fail; 998 goto success; 999 } else { 1000 debug("no space left on block group %d\n", i); 1001 } 1002 } 1003 1004 goto fail; 1005 } else { 1006 fs->curr_blkno++; 1007 restart: 1008 /* get the blockbitmap index respective to blockno */ 1009 bg_idx = fs->curr_blkno / blk_per_grp; 1010 if (fs->blksz == 1024) { 1011 remainder = fs->curr_blkno % blk_per_grp; 1012 if (!remainder) 1013 bg_idx--; 1014 } 1015 1016 /* 1017 * To skip completely filled block group bitmaps 1018 * Optimize the block allocation 1019 */ 1020 if (bg_idx >= fs->no_blkgrp) 1021 goto fail; 1022 1023 struct ext2_block_group *bgd = NULL; 1024 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1025 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1026 debug("block group %u is full. Skipping\n", bg_idx); 1027 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1028 if (fs->blksz == 1024) 1029 fs->curr_blkno += 1; 1030 goto restart; 1031 } 1032 1033 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1034 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1035 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1036 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1037 put_ext4(b_bitmap_blk * fs->blksz, 1038 zero_buffer, fs->blksz); 1039 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1040 ext4fs_bg_set_flags(bgd, bg_flags); 1041 } 1042 1043 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1044 bg_idx) != 0) { 1045 debug("going for restart for the block no %ld %u\n", 1046 fs->curr_blkno, bg_idx); 1047 fs->curr_blkno++; 1048 goto restart; 1049 } 1050 1051 /* journal backup */ 1052 if (prev_bg_bitmap_index != bg_idx) { 1053 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1054 0, fs->blksz, journal_buffer); 1055 if (status == 0) 1056 goto fail; 1057 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1058 goto fail; 1059 1060 prev_bg_bitmap_index = bg_idx; 1061 } 1062 ext4fs_bg_free_blocks_dec(bgd, fs); 1063 ext4fs_sb_free_blocks_dec(fs->sb); 1064 goto success; 1065 } 1066 success: 1067 free(journal_buffer); 1068 free(zero_buffer); 1069 1070 return fs->curr_blkno; 1071 fail: 1072 free(journal_buffer); 1073 free(zero_buffer); 1074 1075 return -1; 1076 } 1077 1078 int ext4fs_get_new_inode_no(void) 1079 { 1080 short i; 1081 short status; 1082 unsigned int ibmap_idx; 1083 static int prev_inode_bitmap_index = -1; 1084 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1085 struct ext_filesystem *fs = get_fs(); 1086 char *journal_buffer = zalloc(fs->blksz); 1087 char *zero_buffer = zalloc(fs->blksz); 1088 if (!journal_buffer || !zero_buffer) 1089 goto fail; 1090 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1091 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1092 1093 if (fs->first_pass_ibmap == 0) { 1094 for (i = 0; i < fs->no_blkgrp; i++) { 1095 uint32_t free_inodes; 1096 struct ext2_block_group *bgd = NULL; 1097 bgd = ext4fs_get_group_descriptor(fs, i); 1098 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1099 if (free_inodes) { 1100 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1101 uint64_t i_bitmap_blk = 1102 ext4fs_bg_get_inode_id(bgd, fs); 1103 if (has_gdt_chksum) 1104 bgd->bg_itable_unused = free_inodes; 1105 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1106 put_ext4(i_bitmap_blk * fs->blksz, 1107 zero_buffer, fs->blksz); 1108 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1109 ext4fs_bg_set_flags(bgd, bg_flags); 1110 memcpy(fs->inode_bmaps[i], 1111 zero_buffer, fs->blksz); 1112 } 1113 fs->curr_inode_no = 1114 _get_new_inode_no(fs->inode_bmaps[i]); 1115 if (fs->curr_inode_no == -1) 1116 /* inode bitmap is completely filled */ 1117 continue; 1118 fs->curr_inode_no = fs->curr_inode_no + 1119 (i * inodes_per_grp); 1120 fs->first_pass_ibmap++; 1121 ext4fs_bg_free_inodes_dec(bgd, fs); 1122 if (has_gdt_chksum) 1123 ext4fs_bg_itable_unused_dec(bgd, fs); 1124 ext4fs_sb_free_inodes_dec(fs->sb); 1125 status = ext4fs_devread(i_bitmap_blk * 1126 fs->sect_perblk, 1127 0, fs->blksz, 1128 journal_buffer); 1129 if (status == 0) 1130 goto fail; 1131 if (ext4fs_log_journal(journal_buffer, 1132 i_bitmap_blk)) 1133 goto fail; 1134 goto success; 1135 } else 1136 debug("no inode left on block group %d\n", i); 1137 } 1138 goto fail; 1139 } else { 1140 restart: 1141 fs->curr_inode_no++; 1142 /* get the blockbitmap index respective to blockno */ 1143 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1144 struct ext2_block_group *bgd = 1145 ext4fs_get_group_descriptor(fs, ibmap_idx); 1146 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1147 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1148 1149 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1150 put_ext4(i_bitmap_blk * fs->blksz, 1151 zero_buffer, fs->blksz); 1152 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1153 ext4fs_bg_set_flags(bgd, bg_flags); 1154 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1155 fs->blksz); 1156 } 1157 1158 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1159 fs->inode_bmaps[ibmap_idx], 1160 ibmap_idx) != 0) { 1161 debug("going for restart for the block no %d %u\n", 1162 fs->curr_inode_no, ibmap_idx); 1163 goto restart; 1164 } 1165 1166 /* journal backup */ 1167 if (prev_inode_bitmap_index != ibmap_idx) { 1168 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1169 0, fs->blksz, journal_buffer); 1170 if (status == 0) 1171 goto fail; 1172 if (ext4fs_log_journal(journal_buffer, 1173 le32_to_cpu(bgd->inode_id))) 1174 goto fail; 1175 prev_inode_bitmap_index = ibmap_idx; 1176 } 1177 ext4fs_bg_free_inodes_dec(bgd, fs); 1178 if (has_gdt_chksum) 1179 bgd->bg_itable_unused = bgd->free_inodes; 1180 ext4fs_sb_free_inodes_dec(fs->sb); 1181 goto success; 1182 } 1183 1184 success: 1185 free(journal_buffer); 1186 free(zero_buffer); 1187 1188 return fs->curr_inode_no; 1189 fail: 1190 free(journal_buffer); 1191 free(zero_buffer); 1192 1193 return -1; 1194 1195 } 1196 1197 1198 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1199 unsigned int *total_remaining_blocks, 1200 unsigned int *no_blks_reqd) 1201 { 1202 short i; 1203 short status; 1204 long int actual_block_no; 1205 long int si_blockno; 1206 /* si :single indirect */ 1207 __le32 *si_buffer = NULL; 1208 __le32 *si_start_addr = NULL; 1209 struct ext_filesystem *fs = get_fs(); 1210 1211 if (*total_remaining_blocks != 0) { 1212 si_buffer = zalloc(fs->blksz); 1213 if (!si_buffer) { 1214 printf("No Memory\n"); 1215 return; 1216 } 1217 si_start_addr = si_buffer; 1218 si_blockno = ext4fs_get_new_blk_no(); 1219 if (si_blockno == -1) { 1220 printf("no block left to assign\n"); 1221 goto fail; 1222 } 1223 (*no_blks_reqd)++; 1224 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1225 1226 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1227 0, fs->blksz, (char *)si_buffer); 1228 memset(si_buffer, '\0', fs->blksz); 1229 if (status == 0) 1230 goto fail; 1231 1232 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1233 actual_block_no = ext4fs_get_new_blk_no(); 1234 if (actual_block_no == -1) { 1235 printf("no block left to assign\n"); 1236 goto fail; 1237 } 1238 *si_buffer = cpu_to_le32(actual_block_no); 1239 debug("SIAB %u: %u\n", *si_buffer, 1240 *total_remaining_blocks); 1241 1242 si_buffer++; 1243 (*total_remaining_blocks)--; 1244 if (*total_remaining_blocks == 0) 1245 break; 1246 } 1247 1248 /* write the block to disk */ 1249 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1250 si_start_addr, fs->blksz); 1251 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1252 } 1253 fail: 1254 free(si_start_addr); 1255 } 1256 1257 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1258 unsigned int *total_remaining_blocks, 1259 unsigned int *no_blks_reqd) 1260 { 1261 short i; 1262 short j; 1263 short status; 1264 long int actual_block_no; 1265 /* di:double indirect */ 1266 long int di_blockno_parent; 1267 long int di_blockno_child; 1268 __le32 *di_parent_buffer = NULL; 1269 __le32 *di_child_buff = NULL; 1270 __le32 *di_block_start_addr = NULL; 1271 __le32 *di_child_buff_start = NULL; 1272 struct ext_filesystem *fs = get_fs(); 1273 1274 if (*total_remaining_blocks != 0) { 1275 /* double indirect parent block connecting to inode */ 1276 di_blockno_parent = ext4fs_get_new_blk_no(); 1277 if (di_blockno_parent == -1) { 1278 printf("no block left to assign\n"); 1279 goto fail; 1280 } 1281 di_parent_buffer = zalloc(fs->blksz); 1282 if (!di_parent_buffer) 1283 goto fail; 1284 1285 di_block_start_addr = di_parent_buffer; 1286 (*no_blks_reqd)++; 1287 debug("DIPB %ld: %u\n", di_blockno_parent, 1288 *total_remaining_blocks); 1289 1290 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1291 fs->sect_perblk, 0, 1292 fs->blksz, (char *)di_parent_buffer); 1293 1294 if (!status) { 1295 printf("%s: Device read error!\n", __func__); 1296 goto fail; 1297 } 1298 memset(di_parent_buffer, '\0', fs->blksz); 1299 1300 /* 1301 * start:for each double indirect parent 1302 * block create one more block 1303 */ 1304 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1305 di_blockno_child = ext4fs_get_new_blk_no(); 1306 if (di_blockno_child == -1) { 1307 printf("no block left to assign\n"); 1308 goto fail; 1309 } 1310 di_child_buff = zalloc(fs->blksz); 1311 if (!di_child_buff) 1312 goto fail; 1313 1314 di_child_buff_start = di_child_buff; 1315 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1316 di_parent_buffer++; 1317 (*no_blks_reqd)++; 1318 debug("DICB %ld: %u\n", di_blockno_child, 1319 *total_remaining_blocks); 1320 1321 status = ext4fs_devread((lbaint_t)di_blockno_child * 1322 fs->sect_perblk, 0, 1323 fs->blksz, 1324 (char *)di_child_buff); 1325 1326 if (!status) { 1327 printf("%s: Device read error!\n", __func__); 1328 goto fail; 1329 } 1330 memset(di_child_buff, '\0', fs->blksz); 1331 /* filling of actual datablocks for each child */ 1332 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1333 actual_block_no = ext4fs_get_new_blk_no(); 1334 if (actual_block_no == -1) { 1335 printf("no block left to assign\n"); 1336 goto fail; 1337 } 1338 *di_child_buff = cpu_to_le32(actual_block_no); 1339 debug("DIAB %ld: %u\n", actual_block_no, 1340 *total_remaining_blocks); 1341 1342 di_child_buff++; 1343 (*total_remaining_blocks)--; 1344 if (*total_remaining_blocks == 0) 1345 break; 1346 } 1347 /* write the block table */ 1348 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1349 di_child_buff_start, fs->blksz); 1350 free(di_child_buff_start); 1351 di_child_buff_start = NULL; 1352 1353 if (*total_remaining_blocks == 0) 1354 break; 1355 } 1356 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1357 di_block_start_addr, fs->blksz); 1358 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1359 } 1360 fail: 1361 free(di_block_start_addr); 1362 } 1363 1364 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1365 unsigned int *total_remaining_blocks, 1366 unsigned int *no_blks_reqd) 1367 { 1368 short i; 1369 short j; 1370 short k; 1371 long int actual_block_no; 1372 /* ti: Triple Indirect */ 1373 long int ti_gp_blockno; 1374 long int ti_parent_blockno; 1375 long int ti_child_blockno; 1376 __le32 *ti_gp_buff = NULL; 1377 __le32 *ti_parent_buff = NULL; 1378 __le32 *ti_child_buff = NULL; 1379 __le32 *ti_gp_buff_start_addr = NULL; 1380 __le32 *ti_pbuff_start_addr = NULL; 1381 __le32 *ti_cbuff_start_addr = NULL; 1382 struct ext_filesystem *fs = get_fs(); 1383 if (*total_remaining_blocks != 0) { 1384 /* triple indirect grand parent block connecting to inode */ 1385 ti_gp_blockno = ext4fs_get_new_blk_no(); 1386 if (ti_gp_blockno == -1) { 1387 printf("no block left to assign\n"); 1388 return; 1389 } 1390 ti_gp_buff = zalloc(fs->blksz); 1391 if (!ti_gp_buff) 1392 return; 1393 1394 ti_gp_buff_start_addr = ti_gp_buff; 1395 (*no_blks_reqd)++; 1396 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1397 *total_remaining_blocks); 1398 1399 /* for each 4 byte grand parent entry create one more block */ 1400 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1401 ti_parent_blockno = ext4fs_get_new_blk_no(); 1402 if (ti_parent_blockno == -1) { 1403 printf("no block left to assign\n"); 1404 goto fail; 1405 } 1406 ti_parent_buff = zalloc(fs->blksz); 1407 if (!ti_parent_buff) 1408 goto fail; 1409 1410 ti_pbuff_start_addr = ti_parent_buff; 1411 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1412 ti_gp_buff++; 1413 (*no_blks_reqd)++; 1414 debug("TIPB %ld: %u\n", ti_parent_blockno, 1415 *total_remaining_blocks); 1416 1417 /* for each 4 byte entry parent create one more block */ 1418 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1419 ti_child_blockno = ext4fs_get_new_blk_no(); 1420 if (ti_child_blockno == -1) { 1421 printf("no block left assign\n"); 1422 goto fail1; 1423 } 1424 ti_child_buff = zalloc(fs->blksz); 1425 if (!ti_child_buff) 1426 goto fail1; 1427 1428 ti_cbuff_start_addr = ti_child_buff; 1429 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1430 ti_parent_buff++; 1431 (*no_blks_reqd)++; 1432 debug("TICB %ld: %u\n", ti_parent_blockno, 1433 *total_remaining_blocks); 1434 1435 /* fill actual datablocks for each child */ 1436 for (k = 0; k < (fs->blksz / sizeof(int)); 1437 k++) { 1438 actual_block_no = 1439 ext4fs_get_new_blk_no(); 1440 if (actual_block_no == -1) { 1441 printf("no block left\n"); 1442 free(ti_cbuff_start_addr); 1443 goto fail1; 1444 } 1445 *ti_child_buff = cpu_to_le32(actual_block_no); 1446 debug("TIAB %ld: %u\n", actual_block_no, 1447 *total_remaining_blocks); 1448 1449 ti_child_buff++; 1450 (*total_remaining_blocks)--; 1451 if (*total_remaining_blocks == 0) 1452 break; 1453 } 1454 /* write the child block */ 1455 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1456 (uint64_t)fs->blksz)), 1457 ti_cbuff_start_addr, fs->blksz); 1458 free(ti_cbuff_start_addr); 1459 1460 if (*total_remaining_blocks == 0) 1461 break; 1462 } 1463 /* write the parent block */ 1464 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1465 ti_pbuff_start_addr, fs->blksz); 1466 free(ti_pbuff_start_addr); 1467 1468 if (*total_remaining_blocks == 0) 1469 break; 1470 } 1471 /* write the grand parent block */ 1472 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1473 ti_gp_buff_start_addr, fs->blksz); 1474 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1475 free(ti_gp_buff_start_addr); 1476 return; 1477 } 1478 fail1: 1479 free(ti_pbuff_start_addr); 1480 fail: 1481 free(ti_gp_buff_start_addr); 1482 } 1483 1484 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1485 unsigned int total_remaining_blocks, 1486 unsigned int *total_no_of_block) 1487 { 1488 short i; 1489 long int direct_blockno; 1490 unsigned int no_blks_reqd = 0; 1491 1492 /* allocation of direct blocks */ 1493 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1494 direct_blockno = ext4fs_get_new_blk_no(); 1495 if (direct_blockno == -1) { 1496 printf("no block left to assign\n"); 1497 return; 1498 } 1499 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1500 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1501 1502 total_remaining_blocks--; 1503 } 1504 1505 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1506 &no_blks_reqd); 1507 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1508 &no_blks_reqd); 1509 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1510 &no_blks_reqd); 1511 *total_no_of_block += no_blks_reqd; 1512 } 1513 1514 #endif 1515 1516 static struct ext4_extent_header *ext4fs_get_extent_block 1517 (struct ext2_data *data, char *buf, 1518 struct ext4_extent_header *ext_block, 1519 uint32_t fileblock, int log2_blksz) 1520 { 1521 struct ext4_extent_idx *index; 1522 unsigned long long block; 1523 int blksz = EXT2_BLOCK_SIZE(data); 1524 int i; 1525 1526 while (1) { 1527 index = (struct ext4_extent_idx *)(ext_block + 1); 1528 1529 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1530 return NULL; 1531 1532 if (ext_block->eh_depth == 0) 1533 return ext_block; 1534 i = -1; 1535 do { 1536 i++; 1537 if (i >= le16_to_cpu(ext_block->eh_entries)) 1538 break; 1539 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1540 1541 if (--i < 0) 1542 return NULL; 1543 1544 block = le16_to_cpu(index[i].ei_leaf_hi); 1545 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1546 1547 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1548 buf)) 1549 ext_block = (struct ext4_extent_header *)buf; 1550 else 1551 return NULL; 1552 } 1553 } 1554 1555 static int ext4fs_blockgroup 1556 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1557 { 1558 long int blkno; 1559 unsigned int blkoff, desc_per_blk; 1560 int log2blksz = get_fs()->dev_desc->log2blksz; 1561 int desc_size = get_fs()->gdsize; 1562 1563 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1564 1565 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1566 group / desc_per_blk; 1567 blkoff = (group % desc_per_blk) * desc_size; 1568 1569 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1570 group, blkno, blkoff); 1571 1572 return ext4fs_devread((lbaint_t)blkno << 1573 (LOG2_BLOCK_SIZE(data) - log2blksz), 1574 blkoff, desc_size, (char *)blkgrp); 1575 } 1576 1577 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1578 { 1579 struct ext2_block_group blkgrp; 1580 struct ext2_sblock *sblock = &data->sblock; 1581 struct ext_filesystem *fs = get_fs(); 1582 int log2blksz = get_fs()->dev_desc->log2blksz; 1583 int inodes_per_block, status; 1584 long int blkno; 1585 unsigned int blkoff; 1586 1587 /* It is easier to calculate if the first inode is 0. */ 1588 ino--; 1589 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1590 (sblock->inodes_per_group), &blkgrp); 1591 if (status == 0) 1592 return 0; 1593 1594 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1595 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1596 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1597 blkoff = (ino % inodes_per_block) * fs->inodesz; 1598 /* Read the inode. */ 1599 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1600 log2blksz), blkoff, 1601 sizeof(struct ext2_inode), (char *)inode); 1602 if (status == 0) 1603 return 0; 1604 1605 return 1; 1606 } 1607 1608 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1609 { 1610 long int blknr; 1611 int blksz; 1612 int log2_blksz; 1613 int status; 1614 long int rblock; 1615 long int perblock_parent; 1616 long int perblock_child; 1617 unsigned long long start; 1618 /* get the blocksize of the filesystem */ 1619 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1620 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1621 - get_fs()->dev_desc->log2blksz; 1622 1623 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1624 long int startblock, endblock; 1625 char *buf = zalloc(blksz); 1626 if (!buf) 1627 return -ENOMEM; 1628 struct ext4_extent_header *ext_block; 1629 struct ext4_extent *extent; 1630 int i; 1631 ext_block = 1632 ext4fs_get_extent_block(ext4fs_root, buf, 1633 (struct ext4_extent_header *) 1634 inode->b.blocks.dir_blocks, 1635 fileblock, log2_blksz); 1636 if (!ext_block) { 1637 printf("invalid extent block\n"); 1638 free(buf); 1639 return -EINVAL; 1640 } 1641 1642 extent = (struct ext4_extent *)(ext_block + 1); 1643 1644 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { 1645 startblock = le32_to_cpu(extent[i].ee_block); 1646 endblock = startblock + le16_to_cpu(extent[i].ee_len); 1647 1648 if (startblock > fileblock) { 1649 /* Sparse file */ 1650 free(buf); 1651 return 0; 1652 1653 } else if (fileblock < endblock) { 1654 start = le16_to_cpu(extent[i].ee_start_hi); 1655 start = (start << 32) + 1656 le32_to_cpu(extent[i].ee_start_lo); 1657 free(buf); 1658 return (fileblock - startblock) + start; 1659 } 1660 } 1661 1662 free(buf); 1663 return 0; 1664 } 1665 1666 /* Direct blocks. */ 1667 if (fileblock < INDIRECT_BLOCKS) 1668 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1669 1670 /* Indirect. */ 1671 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1672 if (ext4fs_indir1_block == NULL) { 1673 ext4fs_indir1_block = zalloc(blksz); 1674 if (ext4fs_indir1_block == NULL) { 1675 printf("** SI ext2fs read block (indir 1)" 1676 "malloc failed. **\n"); 1677 return -1; 1678 } 1679 ext4fs_indir1_size = blksz; 1680 ext4fs_indir1_blkno = -1; 1681 } 1682 if (blksz != ext4fs_indir1_size) { 1683 free(ext4fs_indir1_block); 1684 ext4fs_indir1_block = NULL; 1685 ext4fs_indir1_size = 0; 1686 ext4fs_indir1_blkno = -1; 1687 ext4fs_indir1_block = zalloc(blksz); 1688 if (ext4fs_indir1_block == NULL) { 1689 printf("** SI ext2fs read block (indir 1):" 1690 "malloc failed. **\n"); 1691 return -1; 1692 } 1693 ext4fs_indir1_size = blksz; 1694 } 1695 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1696 log2_blksz) != ext4fs_indir1_blkno) { 1697 status = 1698 ext4fs_devread((lbaint_t)le32_to_cpu 1699 (inode->b.blocks. 1700 indir_block) << log2_blksz, 0, 1701 blksz, (char *)ext4fs_indir1_block); 1702 if (status == 0) { 1703 printf("** SI ext2fs read block (indir 1)" 1704 "failed. **\n"); 1705 return -1; 1706 } 1707 ext4fs_indir1_blkno = 1708 le32_to_cpu(inode->b.blocks. 1709 indir_block) << log2_blksz; 1710 } 1711 blknr = le32_to_cpu(ext4fs_indir1_block 1712 [fileblock - INDIRECT_BLOCKS]); 1713 } 1714 /* Double indirect. */ 1715 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1716 (blksz / 4 + 1)))) { 1717 1718 long int perblock = blksz / 4; 1719 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1720 1721 if (ext4fs_indir1_block == NULL) { 1722 ext4fs_indir1_block = zalloc(blksz); 1723 if (ext4fs_indir1_block == NULL) { 1724 printf("** DI ext2fs read block (indir 2 1)" 1725 "malloc failed. **\n"); 1726 return -1; 1727 } 1728 ext4fs_indir1_size = blksz; 1729 ext4fs_indir1_blkno = -1; 1730 } 1731 if (blksz != ext4fs_indir1_size) { 1732 free(ext4fs_indir1_block); 1733 ext4fs_indir1_block = NULL; 1734 ext4fs_indir1_size = 0; 1735 ext4fs_indir1_blkno = -1; 1736 ext4fs_indir1_block = zalloc(blksz); 1737 if (ext4fs_indir1_block == NULL) { 1738 printf("** DI ext2fs read block (indir 2 1)" 1739 "malloc failed. **\n"); 1740 return -1; 1741 } 1742 ext4fs_indir1_size = blksz; 1743 } 1744 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1745 log2_blksz) != ext4fs_indir1_blkno) { 1746 status = 1747 ext4fs_devread((lbaint_t)le32_to_cpu 1748 (inode->b.blocks. 1749 double_indir_block) << log2_blksz, 1750 0, blksz, 1751 (char *)ext4fs_indir1_block); 1752 if (status == 0) { 1753 printf("** DI ext2fs read block (indir 2 1)" 1754 "failed. **\n"); 1755 return -1; 1756 } 1757 ext4fs_indir1_blkno = 1758 le32_to_cpu(inode->b.blocks.double_indir_block) << 1759 log2_blksz; 1760 } 1761 1762 if (ext4fs_indir2_block == NULL) { 1763 ext4fs_indir2_block = zalloc(blksz); 1764 if (ext4fs_indir2_block == NULL) { 1765 printf("** DI ext2fs read block (indir 2 2)" 1766 "malloc failed. **\n"); 1767 return -1; 1768 } 1769 ext4fs_indir2_size = blksz; 1770 ext4fs_indir2_blkno = -1; 1771 } 1772 if (blksz != ext4fs_indir2_size) { 1773 free(ext4fs_indir2_block); 1774 ext4fs_indir2_block = NULL; 1775 ext4fs_indir2_size = 0; 1776 ext4fs_indir2_blkno = -1; 1777 ext4fs_indir2_block = zalloc(blksz); 1778 if (ext4fs_indir2_block == NULL) { 1779 printf("** DI ext2fs read block (indir 2 2)" 1780 "malloc failed. **\n"); 1781 return -1; 1782 } 1783 ext4fs_indir2_size = blksz; 1784 } 1785 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1786 log2_blksz) != ext4fs_indir2_blkno) { 1787 status = ext4fs_devread((lbaint_t)le32_to_cpu 1788 (ext4fs_indir1_block 1789 [rblock / 1790 perblock]) << log2_blksz, 0, 1791 blksz, 1792 (char *)ext4fs_indir2_block); 1793 if (status == 0) { 1794 printf("** DI ext2fs read block (indir 2 2)" 1795 "failed. **\n"); 1796 return -1; 1797 } 1798 ext4fs_indir2_blkno = 1799 le32_to_cpu(ext4fs_indir1_block[rblock 1800 / 1801 perblock]) << 1802 log2_blksz; 1803 } 1804 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1805 } 1806 /* Tripple indirect. */ 1807 else { 1808 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1809 (blksz / 4 * blksz / 4)); 1810 perblock_child = blksz / 4; 1811 perblock_parent = ((blksz / 4) * (blksz / 4)); 1812 1813 if (ext4fs_indir1_block == NULL) { 1814 ext4fs_indir1_block = zalloc(blksz); 1815 if (ext4fs_indir1_block == NULL) { 1816 printf("** TI ext2fs read block (indir 2 1)" 1817 "malloc failed. **\n"); 1818 return -1; 1819 } 1820 ext4fs_indir1_size = blksz; 1821 ext4fs_indir1_blkno = -1; 1822 } 1823 if (blksz != ext4fs_indir1_size) { 1824 free(ext4fs_indir1_block); 1825 ext4fs_indir1_block = NULL; 1826 ext4fs_indir1_size = 0; 1827 ext4fs_indir1_blkno = -1; 1828 ext4fs_indir1_block = zalloc(blksz); 1829 if (ext4fs_indir1_block == NULL) { 1830 printf("** TI ext2fs read block (indir 2 1)" 1831 "malloc failed. **\n"); 1832 return -1; 1833 } 1834 ext4fs_indir1_size = blksz; 1835 } 1836 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1837 log2_blksz) != ext4fs_indir1_blkno) { 1838 status = ext4fs_devread 1839 ((lbaint_t) 1840 le32_to_cpu(inode->b.blocks.triple_indir_block) 1841 << log2_blksz, 0, blksz, 1842 (char *)ext4fs_indir1_block); 1843 if (status == 0) { 1844 printf("** TI ext2fs read block (indir 2 1)" 1845 "failed. **\n"); 1846 return -1; 1847 } 1848 ext4fs_indir1_blkno = 1849 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1850 log2_blksz; 1851 } 1852 1853 if (ext4fs_indir2_block == NULL) { 1854 ext4fs_indir2_block = zalloc(blksz); 1855 if (ext4fs_indir2_block == NULL) { 1856 printf("** TI ext2fs read block (indir 2 2)" 1857 "malloc failed. **\n"); 1858 return -1; 1859 } 1860 ext4fs_indir2_size = blksz; 1861 ext4fs_indir2_blkno = -1; 1862 } 1863 if (blksz != ext4fs_indir2_size) { 1864 free(ext4fs_indir2_block); 1865 ext4fs_indir2_block = NULL; 1866 ext4fs_indir2_size = 0; 1867 ext4fs_indir2_blkno = -1; 1868 ext4fs_indir2_block = zalloc(blksz); 1869 if (ext4fs_indir2_block == NULL) { 1870 printf("** TI ext2fs read block (indir 2 2)" 1871 "malloc failed. **\n"); 1872 return -1; 1873 } 1874 ext4fs_indir2_size = blksz; 1875 } 1876 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1877 perblock_parent]) << 1878 log2_blksz) 1879 != ext4fs_indir2_blkno) { 1880 status = ext4fs_devread((lbaint_t)le32_to_cpu 1881 (ext4fs_indir1_block 1882 [rblock / 1883 perblock_parent]) << 1884 log2_blksz, 0, blksz, 1885 (char *)ext4fs_indir2_block); 1886 if (status == 0) { 1887 printf("** TI ext2fs read block (indir 2 2)" 1888 "failed. **\n"); 1889 return -1; 1890 } 1891 ext4fs_indir2_blkno = 1892 le32_to_cpu(ext4fs_indir1_block[rblock / 1893 perblock_parent]) 1894 << log2_blksz; 1895 } 1896 1897 if (ext4fs_indir3_block == NULL) { 1898 ext4fs_indir3_block = zalloc(blksz); 1899 if (ext4fs_indir3_block == NULL) { 1900 printf("** TI ext2fs read block (indir 2 2)" 1901 "malloc failed. **\n"); 1902 return -1; 1903 } 1904 ext4fs_indir3_size = blksz; 1905 ext4fs_indir3_blkno = -1; 1906 } 1907 if (blksz != ext4fs_indir3_size) { 1908 free(ext4fs_indir3_block); 1909 ext4fs_indir3_block = NULL; 1910 ext4fs_indir3_size = 0; 1911 ext4fs_indir3_blkno = -1; 1912 ext4fs_indir3_block = zalloc(blksz); 1913 if (ext4fs_indir3_block == NULL) { 1914 printf("** TI ext2fs read block (indir 2 2)" 1915 "malloc failed. **\n"); 1916 return -1; 1917 } 1918 ext4fs_indir3_size = blksz; 1919 } 1920 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1921 / 1922 perblock_child]) << 1923 log2_blksz) != ext4fs_indir3_blkno) { 1924 status = 1925 ext4fs_devread((lbaint_t)le32_to_cpu 1926 (ext4fs_indir2_block 1927 [(rblock / perblock_child) 1928 % (blksz / 4)]) << log2_blksz, 0, 1929 blksz, (char *)ext4fs_indir3_block); 1930 if (status == 0) { 1931 printf("** TI ext2fs read block (indir 2 2)" 1932 "failed. **\n"); 1933 return -1; 1934 } 1935 ext4fs_indir3_blkno = 1936 le32_to_cpu(ext4fs_indir2_block[(rblock / 1937 perblock_child) % 1938 (blksz / 1939 4)]) << 1940 log2_blksz; 1941 } 1942 1943 blknr = le32_to_cpu(ext4fs_indir3_block 1944 [rblock % perblock_child]); 1945 } 1946 debug("read_allocated_block %ld\n", blknr); 1947 1948 return blknr; 1949 } 1950 1951 /** 1952 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1953 * global pointers 1954 * 1955 * This function assures that for a file with the same name but different size 1956 * the sequential store on the ext4 filesystem will be correct. 1957 * 1958 * In this function the global data, responsible for internal representation 1959 * of the ext4 data are initialized to the reset state. Without this, during 1960 * replacement of the smaller file with the bigger truncation of new file was 1961 * performed. 1962 */ 1963 void ext4fs_reinit_global(void) 1964 { 1965 if (ext4fs_indir1_block != NULL) { 1966 free(ext4fs_indir1_block); 1967 ext4fs_indir1_block = NULL; 1968 ext4fs_indir1_size = 0; 1969 ext4fs_indir1_blkno = -1; 1970 } 1971 if (ext4fs_indir2_block != NULL) { 1972 free(ext4fs_indir2_block); 1973 ext4fs_indir2_block = NULL; 1974 ext4fs_indir2_size = 0; 1975 ext4fs_indir2_blkno = -1; 1976 } 1977 if (ext4fs_indir3_block != NULL) { 1978 free(ext4fs_indir3_block); 1979 ext4fs_indir3_block = NULL; 1980 ext4fs_indir3_size = 0; 1981 ext4fs_indir3_blkno = -1; 1982 } 1983 } 1984 void ext4fs_close(void) 1985 { 1986 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1987 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1988 ext4fs_file = NULL; 1989 } 1990 if (ext4fs_root != NULL) { 1991 free(ext4fs_root); 1992 ext4fs_root = NULL; 1993 } 1994 1995 ext4fs_reinit_global(); 1996 } 1997 1998 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 1999 struct ext2fs_node **fnode, int *ftype) 2000 { 2001 unsigned int fpos = 0; 2002 int status; 2003 loff_t actread; 2004 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 2005 2006 #ifdef DEBUG 2007 if (name != NULL) 2008 printf("Iterate dir %s\n", name); 2009 #endif /* of DEBUG */ 2010 if (!diro->inode_read) { 2011 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2012 if (status == 0) 2013 return 0; 2014 } 2015 /* Search the file. */ 2016 while (fpos < le32_to_cpu(diro->inode.size)) { 2017 struct ext2_dirent dirent; 2018 2019 status = ext4fs_read_file(diro, fpos, 2020 sizeof(struct ext2_dirent), 2021 (char *)&dirent, &actread); 2022 if (status < 0) 2023 return 0; 2024 2025 if (dirent.direntlen == 0) { 2026 printf("Failed to iterate over directory %s\n", name); 2027 return 0; 2028 } 2029 2030 if (dirent.namelen != 0) { 2031 char filename[dirent.namelen + 1]; 2032 struct ext2fs_node *fdiro; 2033 int type = FILETYPE_UNKNOWN; 2034 2035 status = ext4fs_read_file(diro, 2036 fpos + 2037 sizeof(struct ext2_dirent), 2038 dirent.namelen, filename, 2039 &actread); 2040 if (status < 0) 2041 return 0; 2042 2043 fdiro = zalloc(sizeof(struct ext2fs_node)); 2044 if (!fdiro) 2045 return 0; 2046 2047 fdiro->data = diro->data; 2048 fdiro->ino = le32_to_cpu(dirent.inode); 2049 2050 filename[dirent.namelen] = '\0'; 2051 2052 if (dirent.filetype != FILETYPE_UNKNOWN) { 2053 fdiro->inode_read = 0; 2054 2055 if (dirent.filetype == FILETYPE_DIRECTORY) 2056 type = FILETYPE_DIRECTORY; 2057 else if (dirent.filetype == FILETYPE_SYMLINK) 2058 type = FILETYPE_SYMLINK; 2059 else if (dirent.filetype == FILETYPE_REG) 2060 type = FILETYPE_REG; 2061 } else { 2062 status = ext4fs_read_inode(diro->data, 2063 le32_to_cpu 2064 (dirent.inode), 2065 &fdiro->inode); 2066 if (status == 0) { 2067 free(fdiro); 2068 return 0; 2069 } 2070 fdiro->inode_read = 1; 2071 2072 if ((le16_to_cpu(fdiro->inode.mode) & 2073 FILETYPE_INO_MASK) == 2074 FILETYPE_INO_DIRECTORY) { 2075 type = FILETYPE_DIRECTORY; 2076 } else if ((le16_to_cpu(fdiro->inode.mode) 2077 & FILETYPE_INO_MASK) == 2078 FILETYPE_INO_SYMLINK) { 2079 type = FILETYPE_SYMLINK; 2080 } else if ((le16_to_cpu(fdiro->inode.mode) 2081 & FILETYPE_INO_MASK) == 2082 FILETYPE_INO_REG) { 2083 type = FILETYPE_REG; 2084 } 2085 } 2086 #ifdef DEBUG 2087 printf("iterate >%s<\n", filename); 2088 #endif /* of DEBUG */ 2089 if ((name != NULL) && (fnode != NULL) 2090 && (ftype != NULL)) { 2091 if (strcmp(filename, name) == 0) { 2092 *ftype = type; 2093 *fnode = fdiro; 2094 return 1; 2095 } 2096 } else { 2097 if (fdiro->inode_read == 0) { 2098 status = ext4fs_read_inode(diro->data, 2099 le32_to_cpu( 2100 dirent.inode), 2101 &fdiro->inode); 2102 if (status == 0) { 2103 free(fdiro); 2104 return 0; 2105 } 2106 fdiro->inode_read = 1; 2107 } 2108 switch (type) { 2109 case FILETYPE_DIRECTORY: 2110 printf("<DIR> "); 2111 break; 2112 case FILETYPE_SYMLINK: 2113 printf("<SYM> "); 2114 break; 2115 case FILETYPE_REG: 2116 printf(" "); 2117 break; 2118 default: 2119 printf("< ? > "); 2120 break; 2121 } 2122 printf("%10u %s\n", 2123 le32_to_cpu(fdiro->inode.size), 2124 filename); 2125 } 2126 free(fdiro); 2127 } 2128 fpos += le16_to_cpu(dirent.direntlen); 2129 } 2130 return 0; 2131 } 2132 2133 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2134 { 2135 char *symlink; 2136 struct ext2fs_node *diro = node; 2137 int status; 2138 loff_t actread; 2139 2140 if (!diro->inode_read) { 2141 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2142 if (status == 0) 2143 return NULL; 2144 } 2145 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2146 if (!symlink) 2147 return NULL; 2148 2149 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2150 strncpy(symlink, diro->inode.b.symlink, 2151 le32_to_cpu(diro->inode.size)); 2152 } else { 2153 status = ext4fs_read_file(diro, 0, 2154 le32_to_cpu(diro->inode.size), 2155 symlink, &actread); 2156 if ((status < 0) || (actread == 0)) { 2157 free(symlink); 2158 return NULL; 2159 } 2160 } 2161 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2162 return symlink; 2163 } 2164 2165 static int ext4fs_find_file1(const char *currpath, 2166 struct ext2fs_node *currroot, 2167 struct ext2fs_node **currfound, int *foundtype) 2168 { 2169 char fpath[strlen(currpath) + 1]; 2170 char *name = fpath; 2171 char *next; 2172 int status; 2173 int type = FILETYPE_DIRECTORY; 2174 struct ext2fs_node *currnode = currroot; 2175 struct ext2fs_node *oldnode = currroot; 2176 2177 strncpy(fpath, currpath, strlen(currpath) + 1); 2178 2179 /* Remove all leading slashes. */ 2180 while (*name == '/') 2181 name++; 2182 2183 if (!*name) { 2184 *currfound = currnode; 2185 return 1; 2186 } 2187 2188 for (;;) { 2189 int found; 2190 2191 /* Extract the actual part from the pathname. */ 2192 next = strchr(name, '/'); 2193 if (next) { 2194 /* Remove all leading slashes. */ 2195 while (*next == '/') 2196 *(next++) = '\0'; 2197 } 2198 2199 if (type != FILETYPE_DIRECTORY) { 2200 ext4fs_free_node(currnode, currroot); 2201 return 0; 2202 } 2203 2204 oldnode = currnode; 2205 2206 /* Iterate over the directory. */ 2207 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2208 if (found == 0) 2209 return 0; 2210 2211 if (found == -1) 2212 break; 2213 2214 /* Read in the symlink and follow it. */ 2215 if (type == FILETYPE_SYMLINK) { 2216 char *symlink; 2217 2218 /* Test if the symlink does not loop. */ 2219 if (++symlinknest == 8) { 2220 ext4fs_free_node(currnode, currroot); 2221 ext4fs_free_node(oldnode, currroot); 2222 return 0; 2223 } 2224 2225 symlink = ext4fs_read_symlink(currnode); 2226 ext4fs_free_node(currnode, currroot); 2227 2228 if (!symlink) { 2229 ext4fs_free_node(oldnode, currroot); 2230 return 0; 2231 } 2232 2233 debug("Got symlink >%s<\n", symlink); 2234 2235 if (symlink[0] == '/') { 2236 ext4fs_free_node(oldnode, currroot); 2237 oldnode = &ext4fs_root->diropen; 2238 } 2239 2240 /* Lookup the node the symlink points to. */ 2241 status = ext4fs_find_file1(symlink, oldnode, 2242 &currnode, &type); 2243 2244 free(symlink); 2245 2246 if (status == 0) { 2247 ext4fs_free_node(oldnode, currroot); 2248 return 0; 2249 } 2250 } 2251 2252 ext4fs_free_node(oldnode, currroot); 2253 2254 /* Found the node! */ 2255 if (!next || *next == '\0') { 2256 *currfound = currnode; 2257 *foundtype = type; 2258 return 1; 2259 } 2260 name = next; 2261 } 2262 return -1; 2263 } 2264 2265 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2266 struct ext2fs_node **foundnode, int expecttype) 2267 { 2268 int status; 2269 int foundtype = FILETYPE_DIRECTORY; 2270 2271 symlinknest = 0; 2272 if (!path) 2273 return 0; 2274 2275 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2276 if (status == 0) 2277 return 0; 2278 2279 /* Check if the node that was found was of the expected type. */ 2280 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2281 return 0; 2282 else if ((expecttype == FILETYPE_DIRECTORY) 2283 && (foundtype != expecttype)) 2284 return 0; 2285 2286 return 1; 2287 } 2288 2289 int ext4fs_open(const char *filename, loff_t *len) 2290 { 2291 struct ext2fs_node *fdiro = NULL; 2292 int status; 2293 2294 if (ext4fs_root == NULL) 2295 return -1; 2296 2297 ext4fs_file = NULL; 2298 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2299 FILETYPE_REG); 2300 if (status == 0) 2301 goto fail; 2302 2303 if (!fdiro->inode_read) { 2304 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2305 &fdiro->inode); 2306 if (status == 0) 2307 goto fail; 2308 } 2309 *len = le32_to_cpu(fdiro->inode.size); 2310 ext4fs_file = fdiro; 2311 2312 return 0; 2313 fail: 2314 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2315 2316 return -1; 2317 } 2318 2319 int ext4fs_mount(unsigned part_length) 2320 { 2321 struct ext2_data *data; 2322 int status; 2323 struct ext_filesystem *fs = get_fs(); 2324 data = zalloc(SUPERBLOCK_SIZE); 2325 if (!data) 2326 return 0; 2327 2328 /* Read the superblock. */ 2329 status = ext4_read_superblock((char *)&data->sblock); 2330 2331 if (status == 0) 2332 goto fail; 2333 2334 /* Make sure this is an ext2 filesystem. */ 2335 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2336 goto fail; 2337 2338 2339 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2340 fs->inodesz = 128; 2341 fs->gdsize = 32; 2342 } else { 2343 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2344 __le32_to_cpu(data->sblock.feature_compatibility), 2345 __le32_to_cpu(data->sblock.feature_incompat), 2346 __le32_to_cpu(data->sblock.feature_ro_compat)); 2347 2348 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2349 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2350 EXT4_FEATURE_INCOMPAT_64BIT ? 2351 le16_to_cpu(data->sblock.descriptor_size) : 32; 2352 } 2353 2354 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2355 le32_to_cpu(data->sblock.revision_level), 2356 fs->inodesz, fs->gdsize); 2357 2358 data->diropen.data = data; 2359 data->diropen.ino = 2; 2360 data->diropen.inode_read = 1; 2361 data->inode = &data->diropen.inode; 2362 2363 status = ext4fs_read_inode(data, 2, data->inode); 2364 if (status == 0) 2365 goto fail; 2366 2367 ext4fs_root = data; 2368 2369 return 1; 2370 fail: 2371 printf("Failed to mount ext2 filesystem...\n"); 2372 free(data); 2373 ext4fs_root = NULL; 2374 2375 return 0; 2376 } 2377