1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2011 - 2012 Samsung Electronics 4 * EXT4 filesystem implementation in Uboot by 5 * Uma Shankar <uma.shankar (at) samsung.com> 6 * Manjunatha C Achar <a.manjunatha (at) samsung.com> 7 * 8 * ext4ls and ext4load : Based on ext2 ls load support in Uboot. 9 * 10 * (C) Copyright 2004 11 * esd gmbh <www.esd-electronics.com> 12 * Reinhard Arlt <reinhard.arlt (at) esd-electronics.com> 13 * 14 * based on code from grub2 fs/ext2.c and fs/fshelp.c by 15 * GRUB -- GRand Unified Bootloader 16 * Copyright (C) 2003, 2004 Free Software Foundation, Inc. 17 * 18 * ext4write : Based on generic ext4 protocol. 19 */ 20 21 #include <common.h> 22 #include <ext_common.h> 23 #include <ext4fs.h> 24 #include <inttypes.h> 25 #include <malloc.h> 26 #include <memalign.h> 27 #include <stddef.h> 28 #include <linux/stat.h> 29 #include <linux/time.h> 30 #include <asm/byteorder.h> 31 #include "ext4_common.h" 32 33 struct ext2_data *ext4fs_root; 34 struct ext2fs_node *ext4fs_file; 35 __le32 *ext4fs_indir1_block; 36 int ext4fs_indir1_size; 37 int ext4fs_indir1_blkno = -1; 38 __le32 *ext4fs_indir2_block; 39 int ext4fs_indir2_size; 40 int ext4fs_indir2_blkno = -1; 41 42 __le32 *ext4fs_indir3_block; 43 int ext4fs_indir3_size; 44 int ext4fs_indir3_blkno = -1; 45 struct ext2_inode *g_parent_inode; 46 static int symlinknest; 47 48 #if defined(CONFIG_EXT4_WRITE) 49 struct ext2_block_group *ext4fs_get_group_descriptor 50 (const struct ext_filesystem *fs, uint32_t bg_idx) 51 { 52 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize)); 53 } 54 55 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb) 56 { 57 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1); 58 } 59 60 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb) 61 { 62 uint64_t free_blocks = le32_to_cpu(sb->free_blocks); 63 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; 64 free_blocks--; 65 66 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); 67 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); 68 } 69 70 static inline void ext4fs_bg_free_inodes_dec 71 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 72 { 73 uint32_t free_inodes = le16_to_cpu(bg->free_inodes); 74 if (fs->gdsize == 64) 75 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16; 76 free_inodes--; 77 78 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff); 79 if (fs->gdsize == 64) 80 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16); 81 } 82 83 static inline void ext4fs_bg_free_blocks_dec 84 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 85 { 86 uint32_t free_blocks = le16_to_cpu(bg->free_blocks); 87 if (fs->gdsize == 64) 88 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16; 89 free_blocks--; 90 91 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff); 92 if (fs->gdsize == 64) 93 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16); 94 } 95 96 static inline void ext4fs_bg_itable_unused_dec 97 (struct ext2_block_group *bg, const struct ext_filesystem *fs) 98 { 99 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused); 100 if (fs->gdsize == 64) 101 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16; 102 free_inodes--; 103 104 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff); 105 if (fs->gdsize == 64) 106 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16); 107 } 108 109 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb) 110 { 111 uint64_t free_blocks = le32_to_cpu(sb->free_blocks); 112 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32; 113 return free_blocks; 114 } 115 116 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks) 117 { 118 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff); 119 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32); 120 } 121 122 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg, 123 const struct ext_filesystem *fs) 124 { 125 uint32_t free_blocks = le16_to_cpu(bg->free_blocks); 126 if (fs->gdsize == 64) 127 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16; 128 return free_blocks; 129 } 130 131 static inline 132 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg, 133 const struct ext_filesystem *fs) 134 { 135 uint32_t free_inodes = le16_to_cpu(bg->free_inodes); 136 if (fs->gdsize == 64) 137 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16; 138 return free_inodes; 139 } 140 141 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg) 142 { 143 return le16_to_cpu(bg->bg_flags); 144 } 145 146 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg, 147 uint16_t flags) 148 { 149 bg->bg_flags = cpu_to_le16(flags); 150 } 151 152 /* Block number of the block bitmap */ 153 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg, 154 const struct ext_filesystem *fs) 155 { 156 uint64_t block_nr = le32_to_cpu(bg->block_id); 157 if (fs->gdsize == 64) 158 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32; 159 return block_nr; 160 } 161 162 /* Block number of the inode bitmap */ 163 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg, 164 const struct ext_filesystem *fs) 165 { 166 uint64_t block_nr = le32_to_cpu(bg->inode_id); 167 if (fs->gdsize == 64) 168 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32; 169 return block_nr; 170 } 171 #endif 172 173 /* Block number of the inode table */ 174 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg, 175 const struct ext_filesystem *fs) 176 { 177 uint64_t block_nr = le32_to_cpu(bg->inode_table_id); 178 if (fs->gdsize == 64) 179 block_nr += 180 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32; 181 return block_nr; 182 } 183 184 #if defined(CONFIG_EXT4_WRITE) 185 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n) 186 { 187 uint32_t res = size / n; 188 if (res * n != size) 189 res++; 190 191 return res; 192 } 193 194 void put_ext4(uint64_t off, void *buf, uint32_t size) 195 { 196 uint64_t startblock; 197 uint64_t remainder; 198 unsigned char *temp_ptr = NULL; 199 struct ext_filesystem *fs = get_fs(); 200 int log2blksz = fs->dev_desc->log2blksz; 201 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz); 202 203 startblock = off >> log2blksz; 204 startblock += part_offset; 205 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1); 206 207 if (fs->dev_desc == NULL) 208 return; 209 210 if ((startblock + (size >> log2blksz)) > 211 (part_offset + fs->total_sect)) { 212 printf("part_offset is " LBAFU "\n", part_offset); 213 printf("total_sector is %" PRIu64 "\n", fs->total_sect); 214 printf("error: overflow occurs\n"); 215 return; 216 } 217 218 if (remainder) { 219 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 220 temp_ptr = sec_buf; 221 memcpy((temp_ptr + remainder), (unsigned char *)buf, size); 222 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf); 223 } else { 224 if (size >> log2blksz != 0) { 225 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz, 226 (unsigned long *)buf); 227 } else { 228 blk_dread(fs->dev_desc, startblock, 1, sec_buf); 229 temp_ptr = sec_buf; 230 memcpy(temp_ptr, buf, size); 231 blk_dwrite(fs->dev_desc, startblock, 1, 232 (unsigned long *)sec_buf); 233 } 234 } 235 } 236 237 static int _get_new_inode_no(unsigned char *buffer) 238 { 239 struct ext_filesystem *fs = get_fs(); 240 unsigned char input; 241 int operand, status; 242 int count = 1; 243 int j = 0; 244 245 /* get the blocksize of the filesystem */ 246 unsigned char *ptr = buffer; 247 while (*ptr == 255) { 248 ptr++; 249 count += 8; 250 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group)) 251 return -1; 252 } 253 254 for (j = 0; j < fs->blksz; j++) { 255 input = *ptr; 256 int i = 0; 257 while (i <= 7) { 258 operand = 1 << i; 259 status = input & operand; 260 if (status) { 261 i++; 262 count++; 263 } else { 264 *ptr |= operand; 265 return count; 266 } 267 } 268 ptr = ptr + 1; 269 } 270 271 return -1; 272 } 273 274 static int _get_new_blk_no(unsigned char *buffer) 275 { 276 int operand; 277 int count = 0; 278 int i; 279 unsigned char *ptr = buffer; 280 struct ext_filesystem *fs = get_fs(); 281 282 while (*ptr == 255) { 283 ptr++; 284 count += 8; 285 if (count == (fs->blksz * 8)) 286 return -1; 287 } 288 289 if (fs->blksz == 1024) 290 count += 1; 291 292 for (i = 0; i <= 7; i++) { 293 operand = 1 << i; 294 if (*ptr & operand) { 295 count++; 296 } else { 297 *ptr |= operand; 298 return count; 299 } 300 } 301 302 return -1; 303 } 304 305 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index) 306 { 307 int i, remainder, status; 308 unsigned char *ptr = buffer; 309 unsigned char operand; 310 i = blockno / 8; 311 remainder = blockno % 8; 312 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 313 314 i = i - (index * blocksize); 315 if (blocksize != 1024) { 316 ptr = ptr + i; 317 operand = 1 << remainder; 318 status = *ptr & operand; 319 if (status) 320 return -1; 321 322 *ptr = *ptr | operand; 323 return 0; 324 } else { 325 if (remainder == 0) { 326 ptr = ptr + i - 1; 327 operand = (1 << 7); 328 } else { 329 ptr = ptr + i; 330 operand = (1 << (remainder - 1)); 331 } 332 status = *ptr & operand; 333 if (status) 334 return -1; 335 336 *ptr = *ptr | operand; 337 return 0; 338 } 339 } 340 341 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index) 342 { 343 int i, remainder, status; 344 unsigned char *ptr = buffer; 345 unsigned char operand; 346 i = blockno / 8; 347 remainder = blockno % 8; 348 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root); 349 350 i = i - (index * blocksize); 351 if (blocksize != 1024) { 352 ptr = ptr + i; 353 operand = (1 << remainder); 354 status = *ptr & operand; 355 if (status) 356 *ptr = *ptr & ~(operand); 357 } else { 358 if (remainder == 0) { 359 ptr = ptr + i - 1; 360 operand = (1 << 7); 361 } else { 362 ptr = ptr + i; 363 operand = (1 << (remainder - 1)); 364 } 365 status = *ptr & operand; 366 if (status) 367 *ptr = *ptr & ~(operand); 368 } 369 } 370 371 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index) 372 { 373 int i, remainder, status; 374 unsigned char *ptr = buffer; 375 unsigned char operand; 376 377 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 378 i = inode_no / 8; 379 remainder = inode_no % 8; 380 if (remainder == 0) { 381 ptr = ptr + i - 1; 382 operand = (1 << 7); 383 } else { 384 ptr = ptr + i; 385 operand = (1 << (remainder - 1)); 386 } 387 status = *ptr & operand; 388 if (status) 389 return -1; 390 391 *ptr = *ptr | operand; 392 393 return 0; 394 } 395 396 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index) 397 { 398 int i, remainder, status; 399 unsigned char *ptr = buffer; 400 unsigned char operand; 401 402 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group)); 403 i = inode_no / 8; 404 remainder = inode_no % 8; 405 if (remainder == 0) { 406 ptr = ptr + i - 1; 407 operand = (1 << 7); 408 } else { 409 ptr = ptr + i; 410 operand = (1 << (remainder - 1)); 411 } 412 status = *ptr & operand; 413 if (status) 414 *ptr = *ptr & ~(operand); 415 } 416 417 uint16_t ext4fs_checksum_update(uint32_t i) 418 { 419 struct ext2_block_group *desc; 420 struct ext_filesystem *fs = get_fs(); 421 uint16_t crc = 0; 422 __le32 le32_i = cpu_to_le32(i); 423 424 desc = ext4fs_get_group_descriptor(fs, i); 425 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) { 426 int offset = offsetof(struct ext2_block_group, bg_checksum); 427 428 crc = ext2fs_crc16(~0, fs->sb->unique_id, 429 sizeof(fs->sb->unique_id)); 430 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i)); 431 crc = ext2fs_crc16(crc, desc, offset); 432 offset += sizeof(desc->bg_checksum); /* skip checksum */ 433 assert(offset == sizeof(*desc)); 434 if (offset < fs->gdsize) { 435 crc = ext2fs_crc16(crc, (__u8 *)desc + offset, 436 fs->gdsize - offset); 437 } 438 } 439 440 return crc; 441 } 442 443 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename) 444 { 445 int dentry_length; 446 int sizeof_void_space; 447 int new_entry_byte_reqd; 448 short padding_factor = 0; 449 450 if (dir->namelen % 4 != 0) 451 padding_factor = 4 - (dir->namelen % 4); 452 453 dentry_length = sizeof(struct ext2_dirent) + 454 dir->namelen + padding_factor; 455 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length; 456 if (sizeof_void_space == 0) 457 return 0; 458 459 padding_factor = 0; 460 if (strlen(filename) % 4 != 0) 461 padding_factor = 4 - (strlen(filename) % 4); 462 463 new_entry_byte_reqd = strlen(filename) + 464 sizeof(struct ext2_dirent) + padding_factor; 465 if (sizeof_void_space >= new_entry_byte_reqd) { 466 dir->direntlen = cpu_to_le16(dentry_length); 467 return sizeof_void_space; 468 } 469 470 return 0; 471 } 472 473 int ext4fs_update_parent_dentry(char *filename, int file_type) 474 { 475 unsigned int *zero_buffer = NULL; 476 char *root_first_block_buffer = NULL; 477 int blk_idx; 478 long int first_block_no_of_root = 0; 479 int totalbytes = 0; 480 unsigned int new_entry_byte_reqd; 481 int sizeof_void_space = 0; 482 int templength = 0; 483 int inodeno = -1; 484 int status; 485 struct ext_filesystem *fs = get_fs(); 486 /* directory entry */ 487 struct ext2_dirent *dir; 488 char *temp_dir = NULL; 489 uint32_t new_blk_no; 490 uint32_t new_size; 491 uint32_t new_blockcnt; 492 uint32_t directory_blocks; 493 494 zero_buffer = zalloc(fs->blksz); 495 if (!zero_buffer) { 496 printf("No Memory\n"); 497 return -1; 498 } 499 root_first_block_buffer = zalloc(fs->blksz); 500 if (!root_first_block_buffer) { 501 free(zero_buffer); 502 printf("No Memory\n"); 503 return -1; 504 } 505 new_entry_byte_reqd = ROUND(strlen(filename) + 506 sizeof(struct ext2_dirent), 4); 507 restart: 508 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 509 LOG2_BLOCK_SIZE(ext4fs_root); 510 blk_idx = directory_blocks - 1; 511 512 restart_read: 513 /* read the block no allocated to a file */ 514 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx); 515 if (first_block_no_of_root <= 0) 516 goto fail; 517 518 status = ext4fs_devread((lbaint_t)first_block_no_of_root 519 * fs->sect_perblk, 520 0, fs->blksz, root_first_block_buffer); 521 if (status == 0) 522 goto fail; 523 524 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root)) 525 goto fail; 526 dir = (struct ext2_dirent *)root_first_block_buffer; 527 totalbytes = 0; 528 529 while (le16_to_cpu(dir->direntlen) > 0) { 530 unsigned short used_len = ROUND(dir->namelen + 531 sizeof(struct ext2_dirent), 4); 532 533 /* last entry of block */ 534 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) { 535 536 /* check if new entry fits */ 537 if ((used_len + new_entry_byte_reqd) <= 538 le16_to_cpu(dir->direntlen)) { 539 dir->direntlen = cpu_to_le16(used_len); 540 break; 541 } else { 542 if (blk_idx > 0) { 543 printf("Block full, trying previous\n"); 544 blk_idx--; 545 goto restart_read; 546 } 547 printf("All blocks full: Allocate new\n"); 548 549 if (le32_to_cpu(g_parent_inode->flags) & 550 EXT4_EXTENTS_FL) { 551 printf("Directory uses extents\n"); 552 goto fail; 553 } 554 if (directory_blocks >= INDIRECT_BLOCKS) { 555 printf("Directory exceeds limit\n"); 556 goto fail; 557 } 558 new_blk_no = ext4fs_get_new_blk_no(); 559 if (new_blk_no == -1) { 560 printf("no block left to assign\n"); 561 goto fail; 562 } 563 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz); 564 g_parent_inode->b.blocks. 565 dir_blocks[directory_blocks] = 566 cpu_to_le32(new_blk_no); 567 568 new_size = le32_to_cpu(g_parent_inode->size); 569 new_size += fs->blksz; 570 g_parent_inode->size = cpu_to_le32(new_size); 571 572 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt); 573 new_blockcnt += fs->sect_perblk; 574 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt); 575 576 if (ext4fs_put_metadata 577 (root_first_block_buffer, 578 first_block_no_of_root)) 579 goto fail; 580 goto restart; 581 } 582 } 583 584 templength = le16_to_cpu(dir->direntlen); 585 totalbytes = totalbytes + templength; 586 sizeof_void_space = check_void_in_dentry(dir, filename); 587 if (sizeof_void_space) 588 break; 589 590 dir = (struct ext2_dirent *)((char *)dir + templength); 591 } 592 593 /* make a pointer ready for creating next directory entry */ 594 templength = le16_to_cpu(dir->direntlen); 595 totalbytes = totalbytes + templength; 596 dir = (struct ext2_dirent *)((char *)dir + templength); 597 598 /* get the next available inode number */ 599 inodeno = ext4fs_get_new_inode_no(); 600 if (inodeno == -1) { 601 printf("no inode left to assign\n"); 602 goto fail; 603 } 604 dir->inode = cpu_to_le32(inodeno); 605 if (sizeof_void_space) 606 dir->direntlen = cpu_to_le16(sizeof_void_space); 607 else 608 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes); 609 610 dir->namelen = strlen(filename); 611 dir->filetype = FILETYPE_REG; /* regular file */ 612 temp_dir = (char *)dir; 613 temp_dir = temp_dir + sizeof(struct ext2_dirent); 614 memcpy(temp_dir, filename, strlen(filename)); 615 616 /* update or write the 1st block of root inode */ 617 if (ext4fs_put_metadata(root_first_block_buffer, 618 first_block_no_of_root)) 619 goto fail; 620 621 fail: 622 free(zero_buffer); 623 free(root_first_block_buffer); 624 625 return inodeno; 626 } 627 628 static int search_dir(struct ext2_inode *parent_inode, char *dirname) 629 { 630 int status; 631 int inodeno = 0; 632 int offset; 633 int blk_idx; 634 long int blknr; 635 char *block_buffer = NULL; 636 struct ext2_dirent *dir = NULL; 637 struct ext_filesystem *fs = get_fs(); 638 uint32_t directory_blocks; 639 char *direntname; 640 641 directory_blocks = le32_to_cpu(parent_inode->size) >> 642 LOG2_BLOCK_SIZE(ext4fs_root); 643 644 block_buffer = zalloc(fs->blksz); 645 if (!block_buffer) 646 goto fail; 647 648 /* get the block no allocated to a file */ 649 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 650 blknr = read_allocated_block(parent_inode, blk_idx); 651 if (blknr <= 0) 652 goto fail; 653 654 /* read the directory block */ 655 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 656 0, fs->blksz, (char *)block_buffer); 657 if (status == 0) 658 goto fail; 659 660 offset = 0; 661 do { 662 if (offset & 3) { 663 printf("Badly aligned ext2_dirent\n"); 664 break; 665 } 666 667 dir = (struct ext2_dirent *)(block_buffer + offset); 668 direntname = (char*)(dir) + sizeof(struct ext2_dirent); 669 670 int direntlen = le16_to_cpu(dir->direntlen); 671 if (direntlen < sizeof(struct ext2_dirent)) 672 break; 673 674 if (dir->inode && (strlen(dirname) == dir->namelen) && 675 (strncmp(dirname, direntname, dir->namelen) == 0)) { 676 inodeno = le32_to_cpu(dir->inode); 677 break; 678 } 679 680 offset += direntlen; 681 682 } while (offset < fs->blksz); 683 684 if (inodeno > 0) { 685 free(block_buffer); 686 return inodeno; 687 } 688 } 689 690 fail: 691 free(block_buffer); 692 693 return -1; 694 } 695 696 static int find_dir_depth(char *dirname) 697 { 698 char *token = strtok(dirname, "/"); 699 int count = 0; 700 while (token != NULL) { 701 token = strtok(NULL, "/"); 702 count++; 703 } 704 return count + 1 + 1; 705 /* 706 * for example for string /home/temp 707 * depth=home(1)+temp(1)+1 extra for NULL; 708 * so count is 4; 709 */ 710 } 711 712 static int parse_path(char **arr, char *dirname) 713 { 714 char *token = strtok(dirname, "/"); 715 int i = 0; 716 717 /* add root */ 718 arr[i] = zalloc(strlen("/") + 1); 719 if (!arr[i]) 720 return -ENOMEM; 721 memcpy(arr[i++], "/", strlen("/")); 722 723 /* add each path entry after root */ 724 while (token != NULL) { 725 arr[i] = zalloc(strlen(token) + 1); 726 if (!arr[i]) 727 return -ENOMEM; 728 memcpy(arr[i++], token, strlen(token)); 729 token = strtok(NULL, "/"); 730 } 731 arr[i] = NULL; 732 733 return 0; 734 } 735 736 int ext4fs_iget(int inode_no, struct ext2_inode *inode) 737 { 738 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0) 739 return -1; 740 741 return 0; 742 } 743 744 /* 745 * Function: ext4fs_get_parent_inode_num 746 * Return Value: inode Number of the parent directory of file/Directory to be 747 * created 748 * dirname : Input parmater, input path name of the file/directory to be created 749 * dname : Output parameter, to be filled with the name of the directory 750 * extracted from dirname 751 */ 752 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags) 753 { 754 int i; 755 int depth = 0; 756 int matched_inode_no; 757 int result_inode_no = -1; 758 char **ptr = NULL; 759 char *depth_dirname = NULL; 760 char *parse_dirname = NULL; 761 struct ext2_inode *parent_inode = NULL; 762 struct ext2_inode *first_inode = NULL; 763 struct ext2_inode temp_inode; 764 765 if (*dirname != '/') { 766 printf("Please supply Absolute path\n"); 767 return -1; 768 } 769 770 /* TODO: input validation make equivalent to linux */ 771 depth_dirname = zalloc(strlen(dirname) + 1); 772 if (!depth_dirname) 773 return -ENOMEM; 774 775 memcpy(depth_dirname, dirname, strlen(dirname)); 776 depth = find_dir_depth(depth_dirname); 777 parse_dirname = zalloc(strlen(dirname) + 1); 778 if (!parse_dirname) 779 goto fail; 780 memcpy(parse_dirname, dirname, strlen(dirname)); 781 782 /* allocate memory for each directory level */ 783 ptr = zalloc((depth) * sizeof(char *)); 784 if (!ptr) 785 goto fail; 786 if (parse_path(ptr, parse_dirname)) 787 goto fail; 788 parent_inode = zalloc(sizeof(struct ext2_inode)); 789 if (!parent_inode) 790 goto fail; 791 first_inode = zalloc(sizeof(struct ext2_inode)); 792 if (!first_inode) 793 goto fail; 794 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode)); 795 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode)); 796 if (flags & F_FILE) 797 result_inode_no = EXT2_ROOT_INO; 798 for (i = 1; i < depth; i++) { 799 matched_inode_no = search_dir(parent_inode, ptr[i]); 800 if (matched_inode_no == -1) { 801 if (ptr[i + 1] == NULL && i == 1) { 802 result_inode_no = EXT2_ROOT_INO; 803 goto end; 804 } else { 805 if (ptr[i + 1] == NULL) 806 break; 807 printf("Invalid path\n"); 808 result_inode_no = -1; 809 goto fail; 810 } 811 } else { 812 if (ptr[i + 1] != NULL) { 813 memset(parent_inode, '\0', 814 sizeof(struct ext2_inode)); 815 if (ext4fs_iget(matched_inode_no, 816 parent_inode)) { 817 result_inode_no = -1; 818 goto fail; 819 } 820 result_inode_no = matched_inode_no; 821 } else { 822 break; 823 } 824 } 825 } 826 827 end: 828 if (i == 1) 829 matched_inode_no = search_dir(first_inode, ptr[i]); 830 else 831 matched_inode_no = search_dir(parent_inode, ptr[i]); 832 833 if (matched_inode_no != -1) { 834 ext4fs_iget(matched_inode_no, &temp_inode); 835 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) { 836 printf("It is a Directory\n"); 837 result_inode_no = -1; 838 goto fail; 839 } 840 } 841 842 if (strlen(ptr[i]) > 256) { 843 result_inode_no = -1; 844 goto fail; 845 } 846 memcpy(dname, ptr[i], strlen(ptr[i])); 847 848 fail: 849 free(depth_dirname); 850 free(parse_dirname); 851 for (i = 0; i < depth; i++) { 852 if (!ptr[i]) 853 break; 854 free(ptr[i]); 855 } 856 free(ptr); 857 free(parent_inode); 858 free(first_inode); 859 860 return result_inode_no; 861 } 862 863 static int unlink_filename(char *filename, unsigned int blknr) 864 { 865 int status; 866 int inodeno = 0; 867 int offset; 868 char *block_buffer = NULL; 869 struct ext2_dirent *dir = NULL; 870 struct ext2_dirent *previous_dir; 871 struct ext_filesystem *fs = get_fs(); 872 int ret = -1; 873 char *direntname; 874 875 block_buffer = zalloc(fs->blksz); 876 if (!block_buffer) 877 return -ENOMEM; 878 879 /* read the directory block */ 880 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, 881 fs->blksz, block_buffer); 882 if (status == 0) 883 goto fail; 884 885 offset = 0; 886 do { 887 if (offset & 3) { 888 printf("Badly aligned ext2_dirent\n"); 889 break; 890 } 891 892 previous_dir = dir; 893 dir = (struct ext2_dirent *)(block_buffer + offset); 894 direntname = (char *)(dir) + sizeof(struct ext2_dirent); 895 896 int direntlen = le16_to_cpu(dir->direntlen); 897 if (direntlen < sizeof(struct ext2_dirent)) 898 break; 899 900 if (dir->inode && (strlen(filename) == dir->namelen) && 901 (strncmp(direntname, filename, dir->namelen) == 0)) { 902 inodeno = le32_to_cpu(dir->inode); 903 break; 904 } 905 906 offset += direntlen; 907 908 } while (offset < fs->blksz); 909 910 if (inodeno > 0) { 911 printf("file found, deleting\n"); 912 if (ext4fs_log_journal(block_buffer, blknr)) 913 goto fail; 914 915 if (previous_dir) { 916 /* merge dir entry with predecessor */ 917 uint16_t new_len; 918 new_len = le16_to_cpu(previous_dir->direntlen); 919 new_len += le16_to_cpu(dir->direntlen); 920 previous_dir->direntlen = cpu_to_le16(new_len); 921 } else { 922 /* invalidate dir entry */ 923 dir->inode = 0; 924 } 925 if (ext4fs_put_metadata(block_buffer, blknr)) 926 goto fail; 927 ret = inodeno; 928 } 929 fail: 930 free(block_buffer); 931 932 return ret; 933 } 934 935 int ext4fs_filename_unlink(char *filename) 936 { 937 int blk_idx; 938 long int blknr = -1; 939 int inodeno = -1; 940 uint32_t directory_blocks; 941 942 directory_blocks = le32_to_cpu(g_parent_inode->size) >> 943 LOG2_BLOCK_SIZE(ext4fs_root); 944 945 /* read the block no allocated to a file */ 946 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) { 947 blknr = read_allocated_block(g_parent_inode, blk_idx); 948 if (blknr <= 0) 949 break; 950 inodeno = unlink_filename(filename, blknr); 951 if (inodeno != -1) 952 return inodeno; 953 } 954 955 return -1; 956 } 957 958 uint32_t ext4fs_get_new_blk_no(void) 959 { 960 short i; 961 short status; 962 int remainder; 963 unsigned int bg_idx; 964 static int prev_bg_bitmap_index = -1; 965 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group); 966 struct ext_filesystem *fs = get_fs(); 967 char *journal_buffer = zalloc(fs->blksz); 968 char *zero_buffer = zalloc(fs->blksz); 969 if (!journal_buffer || !zero_buffer) 970 goto fail; 971 972 if (fs->first_pass_bbmap == 0) { 973 for (i = 0; i < fs->no_blkgrp; i++) { 974 struct ext2_block_group *bgd = NULL; 975 bgd = ext4fs_get_group_descriptor(fs, i); 976 if (ext4fs_bg_get_free_blocks(bgd, fs)) { 977 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 978 uint64_t b_bitmap_blk = 979 ext4fs_bg_get_block_id(bgd, fs); 980 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 981 memcpy(fs->blk_bmaps[i], zero_buffer, 982 fs->blksz); 983 put_ext4(b_bitmap_blk * fs->blksz, 984 fs->blk_bmaps[i], fs->blksz); 985 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 986 ext4fs_bg_set_flags(bgd, bg_flags); 987 } 988 fs->curr_blkno = 989 _get_new_blk_no(fs->blk_bmaps[i]); 990 if (fs->curr_blkno == -1) 991 /* block bitmap is completely filled */ 992 continue; 993 fs->curr_blkno = fs->curr_blkno + 994 (i * fs->blksz * 8); 995 fs->first_pass_bbmap++; 996 ext4fs_bg_free_blocks_dec(bgd, fs); 997 ext4fs_sb_free_blocks_dec(fs->sb); 998 status = ext4fs_devread(b_bitmap_blk * 999 fs->sect_perblk, 1000 0, fs->blksz, 1001 journal_buffer); 1002 if (status == 0) 1003 goto fail; 1004 if (ext4fs_log_journal(journal_buffer, 1005 b_bitmap_blk)) 1006 goto fail; 1007 goto success; 1008 } else { 1009 debug("no space left on block group %d\n", i); 1010 } 1011 } 1012 1013 goto fail; 1014 } else { 1015 fs->curr_blkno++; 1016 restart: 1017 /* get the blockbitmap index respective to blockno */ 1018 bg_idx = fs->curr_blkno / blk_per_grp; 1019 if (fs->blksz == 1024) { 1020 remainder = fs->curr_blkno % blk_per_grp; 1021 if (!remainder) 1022 bg_idx--; 1023 } 1024 1025 /* 1026 * To skip completely filled block group bitmaps 1027 * Optimize the block allocation 1028 */ 1029 if (bg_idx >= fs->no_blkgrp) 1030 goto fail; 1031 1032 struct ext2_block_group *bgd = NULL; 1033 bgd = ext4fs_get_group_descriptor(fs, bg_idx); 1034 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) { 1035 debug("block group %u is full. Skipping\n", bg_idx); 1036 fs->curr_blkno = (bg_idx + 1) * blk_per_grp; 1037 if (fs->blksz == 1024) 1038 fs->curr_blkno += 1; 1039 goto restart; 1040 } 1041 1042 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1043 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs); 1044 if (bg_flags & EXT4_BG_BLOCK_UNINIT) { 1045 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz); 1046 put_ext4(b_bitmap_blk * fs->blksz, 1047 zero_buffer, fs->blksz); 1048 bg_flags &= ~EXT4_BG_BLOCK_UNINIT; 1049 ext4fs_bg_set_flags(bgd, bg_flags); 1050 } 1051 1052 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx], 1053 bg_idx) != 0) { 1054 debug("going for restart for the block no %ld %u\n", 1055 fs->curr_blkno, bg_idx); 1056 fs->curr_blkno++; 1057 goto restart; 1058 } 1059 1060 /* journal backup */ 1061 if (prev_bg_bitmap_index != bg_idx) { 1062 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk, 1063 0, fs->blksz, journal_buffer); 1064 if (status == 0) 1065 goto fail; 1066 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk)) 1067 goto fail; 1068 1069 prev_bg_bitmap_index = bg_idx; 1070 } 1071 ext4fs_bg_free_blocks_dec(bgd, fs); 1072 ext4fs_sb_free_blocks_dec(fs->sb); 1073 goto success; 1074 } 1075 success: 1076 free(journal_buffer); 1077 free(zero_buffer); 1078 1079 return fs->curr_blkno; 1080 fail: 1081 free(journal_buffer); 1082 free(zero_buffer); 1083 1084 return -1; 1085 } 1086 1087 int ext4fs_get_new_inode_no(void) 1088 { 1089 short i; 1090 short status; 1091 unsigned int ibmap_idx; 1092 static int prev_inode_bitmap_index = -1; 1093 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group); 1094 struct ext_filesystem *fs = get_fs(); 1095 char *journal_buffer = zalloc(fs->blksz); 1096 char *zero_buffer = zalloc(fs->blksz); 1097 if (!journal_buffer || !zero_buffer) 1098 goto fail; 1099 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) & 1100 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0; 1101 1102 if (fs->first_pass_ibmap == 0) { 1103 for (i = 0; i < fs->no_blkgrp; i++) { 1104 uint32_t free_inodes; 1105 struct ext2_block_group *bgd = NULL; 1106 bgd = ext4fs_get_group_descriptor(fs, i); 1107 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs); 1108 if (free_inodes) { 1109 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1110 uint64_t i_bitmap_blk = 1111 ext4fs_bg_get_inode_id(bgd, fs); 1112 if (has_gdt_chksum) 1113 bgd->bg_itable_unused = free_inodes; 1114 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1115 put_ext4(i_bitmap_blk * fs->blksz, 1116 zero_buffer, fs->blksz); 1117 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1118 ext4fs_bg_set_flags(bgd, bg_flags); 1119 memcpy(fs->inode_bmaps[i], 1120 zero_buffer, fs->blksz); 1121 } 1122 fs->curr_inode_no = 1123 _get_new_inode_no(fs->inode_bmaps[i]); 1124 if (fs->curr_inode_no == -1) 1125 /* inode bitmap is completely filled */ 1126 continue; 1127 fs->curr_inode_no = fs->curr_inode_no + 1128 (i * inodes_per_grp); 1129 fs->first_pass_ibmap++; 1130 ext4fs_bg_free_inodes_dec(bgd, fs); 1131 if (has_gdt_chksum) 1132 ext4fs_bg_itable_unused_dec(bgd, fs); 1133 ext4fs_sb_free_inodes_dec(fs->sb); 1134 status = ext4fs_devread(i_bitmap_blk * 1135 fs->sect_perblk, 1136 0, fs->blksz, 1137 journal_buffer); 1138 if (status == 0) 1139 goto fail; 1140 if (ext4fs_log_journal(journal_buffer, 1141 i_bitmap_blk)) 1142 goto fail; 1143 goto success; 1144 } else 1145 debug("no inode left on block group %d\n", i); 1146 } 1147 goto fail; 1148 } else { 1149 restart: 1150 fs->curr_inode_no++; 1151 /* get the blockbitmap index respective to blockno */ 1152 ibmap_idx = fs->curr_inode_no / inodes_per_grp; 1153 struct ext2_block_group *bgd = 1154 ext4fs_get_group_descriptor(fs, ibmap_idx); 1155 uint16_t bg_flags = ext4fs_bg_get_flags(bgd); 1156 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs); 1157 1158 if (bg_flags & EXT4_BG_INODE_UNINIT) { 1159 put_ext4(i_bitmap_blk * fs->blksz, 1160 zero_buffer, fs->blksz); 1161 bg_flags &= ~EXT4_BG_INODE_UNINIT; 1162 ext4fs_bg_set_flags(bgd, bg_flags); 1163 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer, 1164 fs->blksz); 1165 } 1166 1167 if (ext4fs_set_inode_bmap(fs->curr_inode_no, 1168 fs->inode_bmaps[ibmap_idx], 1169 ibmap_idx) != 0) { 1170 debug("going for restart for the block no %d %u\n", 1171 fs->curr_inode_no, ibmap_idx); 1172 goto restart; 1173 } 1174 1175 /* journal backup */ 1176 if (prev_inode_bitmap_index != ibmap_idx) { 1177 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk, 1178 0, fs->blksz, journal_buffer); 1179 if (status == 0) 1180 goto fail; 1181 if (ext4fs_log_journal(journal_buffer, 1182 le32_to_cpu(bgd->inode_id))) 1183 goto fail; 1184 prev_inode_bitmap_index = ibmap_idx; 1185 } 1186 ext4fs_bg_free_inodes_dec(bgd, fs); 1187 if (has_gdt_chksum) 1188 bgd->bg_itable_unused = bgd->free_inodes; 1189 ext4fs_sb_free_inodes_dec(fs->sb); 1190 goto success; 1191 } 1192 1193 success: 1194 free(journal_buffer); 1195 free(zero_buffer); 1196 1197 return fs->curr_inode_no; 1198 fail: 1199 free(journal_buffer); 1200 free(zero_buffer); 1201 1202 return -1; 1203 1204 } 1205 1206 1207 static void alloc_single_indirect_block(struct ext2_inode *file_inode, 1208 unsigned int *total_remaining_blocks, 1209 unsigned int *no_blks_reqd) 1210 { 1211 short i; 1212 short status; 1213 long int actual_block_no; 1214 long int si_blockno; 1215 /* si :single indirect */ 1216 __le32 *si_buffer = NULL; 1217 __le32 *si_start_addr = NULL; 1218 struct ext_filesystem *fs = get_fs(); 1219 1220 if (*total_remaining_blocks != 0) { 1221 si_buffer = zalloc(fs->blksz); 1222 if (!si_buffer) { 1223 printf("No Memory\n"); 1224 return; 1225 } 1226 si_start_addr = si_buffer; 1227 si_blockno = ext4fs_get_new_blk_no(); 1228 if (si_blockno == -1) { 1229 printf("no block left to assign\n"); 1230 goto fail; 1231 } 1232 (*no_blks_reqd)++; 1233 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks); 1234 1235 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk, 1236 0, fs->blksz, (char *)si_buffer); 1237 memset(si_buffer, '\0', fs->blksz); 1238 if (status == 0) 1239 goto fail; 1240 1241 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1242 actual_block_no = ext4fs_get_new_blk_no(); 1243 if (actual_block_no == -1) { 1244 printf("no block left to assign\n"); 1245 goto fail; 1246 } 1247 *si_buffer = cpu_to_le32(actual_block_no); 1248 debug("SIAB %u: %u\n", *si_buffer, 1249 *total_remaining_blocks); 1250 1251 si_buffer++; 1252 (*total_remaining_blocks)--; 1253 if (*total_remaining_blocks == 0) 1254 break; 1255 } 1256 1257 /* write the block to disk */ 1258 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)), 1259 si_start_addr, fs->blksz); 1260 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno); 1261 } 1262 fail: 1263 free(si_start_addr); 1264 } 1265 1266 static void alloc_double_indirect_block(struct ext2_inode *file_inode, 1267 unsigned int *total_remaining_blocks, 1268 unsigned int *no_blks_reqd) 1269 { 1270 short i; 1271 short j; 1272 short status; 1273 long int actual_block_no; 1274 /* di:double indirect */ 1275 long int di_blockno_parent; 1276 long int di_blockno_child; 1277 __le32 *di_parent_buffer = NULL; 1278 __le32 *di_child_buff = NULL; 1279 __le32 *di_block_start_addr = NULL; 1280 __le32 *di_child_buff_start = NULL; 1281 struct ext_filesystem *fs = get_fs(); 1282 1283 if (*total_remaining_blocks != 0) { 1284 /* double indirect parent block connecting to inode */ 1285 di_blockno_parent = ext4fs_get_new_blk_no(); 1286 if (di_blockno_parent == -1) { 1287 printf("no block left to assign\n"); 1288 goto fail; 1289 } 1290 di_parent_buffer = zalloc(fs->blksz); 1291 if (!di_parent_buffer) 1292 goto fail; 1293 1294 di_block_start_addr = di_parent_buffer; 1295 (*no_blks_reqd)++; 1296 debug("DIPB %ld: %u\n", di_blockno_parent, 1297 *total_remaining_blocks); 1298 1299 status = ext4fs_devread((lbaint_t)di_blockno_parent * 1300 fs->sect_perblk, 0, 1301 fs->blksz, (char *)di_parent_buffer); 1302 1303 if (!status) { 1304 printf("%s: Device read error!\n", __func__); 1305 goto fail; 1306 } 1307 memset(di_parent_buffer, '\0', fs->blksz); 1308 1309 /* 1310 * start:for each double indirect parent 1311 * block create one more block 1312 */ 1313 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1314 di_blockno_child = ext4fs_get_new_blk_no(); 1315 if (di_blockno_child == -1) { 1316 printf("no block left to assign\n"); 1317 goto fail; 1318 } 1319 di_child_buff = zalloc(fs->blksz); 1320 if (!di_child_buff) 1321 goto fail; 1322 1323 di_child_buff_start = di_child_buff; 1324 *di_parent_buffer = cpu_to_le32(di_blockno_child); 1325 di_parent_buffer++; 1326 (*no_blks_reqd)++; 1327 debug("DICB %ld: %u\n", di_blockno_child, 1328 *total_remaining_blocks); 1329 1330 status = ext4fs_devread((lbaint_t)di_blockno_child * 1331 fs->sect_perblk, 0, 1332 fs->blksz, 1333 (char *)di_child_buff); 1334 1335 if (!status) { 1336 printf("%s: Device read error!\n", __func__); 1337 goto fail; 1338 } 1339 memset(di_child_buff, '\0', fs->blksz); 1340 /* filling of actual datablocks for each child */ 1341 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1342 actual_block_no = ext4fs_get_new_blk_no(); 1343 if (actual_block_no == -1) { 1344 printf("no block left to assign\n"); 1345 goto fail; 1346 } 1347 *di_child_buff = cpu_to_le32(actual_block_no); 1348 debug("DIAB %ld: %u\n", actual_block_no, 1349 *total_remaining_blocks); 1350 1351 di_child_buff++; 1352 (*total_remaining_blocks)--; 1353 if (*total_remaining_blocks == 0) 1354 break; 1355 } 1356 /* write the block table */ 1357 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)), 1358 di_child_buff_start, fs->blksz); 1359 free(di_child_buff_start); 1360 di_child_buff_start = NULL; 1361 1362 if (*total_remaining_blocks == 0) 1363 break; 1364 } 1365 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)), 1366 di_block_start_addr, fs->blksz); 1367 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent); 1368 } 1369 fail: 1370 free(di_block_start_addr); 1371 } 1372 1373 static void alloc_triple_indirect_block(struct ext2_inode *file_inode, 1374 unsigned int *total_remaining_blocks, 1375 unsigned int *no_blks_reqd) 1376 { 1377 short i; 1378 short j; 1379 short k; 1380 long int actual_block_no; 1381 /* ti: Triple Indirect */ 1382 long int ti_gp_blockno; 1383 long int ti_parent_blockno; 1384 long int ti_child_blockno; 1385 __le32 *ti_gp_buff = NULL; 1386 __le32 *ti_parent_buff = NULL; 1387 __le32 *ti_child_buff = NULL; 1388 __le32 *ti_gp_buff_start_addr = NULL; 1389 __le32 *ti_pbuff_start_addr = NULL; 1390 __le32 *ti_cbuff_start_addr = NULL; 1391 struct ext_filesystem *fs = get_fs(); 1392 if (*total_remaining_blocks != 0) { 1393 /* triple indirect grand parent block connecting to inode */ 1394 ti_gp_blockno = ext4fs_get_new_blk_no(); 1395 if (ti_gp_blockno == -1) { 1396 printf("no block left to assign\n"); 1397 return; 1398 } 1399 ti_gp_buff = zalloc(fs->blksz); 1400 if (!ti_gp_buff) 1401 return; 1402 1403 ti_gp_buff_start_addr = ti_gp_buff; 1404 (*no_blks_reqd)++; 1405 debug("TIGPB %ld: %u\n", ti_gp_blockno, 1406 *total_remaining_blocks); 1407 1408 /* for each 4 byte grand parent entry create one more block */ 1409 for (i = 0; i < (fs->blksz / sizeof(int)); i++) { 1410 ti_parent_blockno = ext4fs_get_new_blk_no(); 1411 if (ti_parent_blockno == -1) { 1412 printf("no block left to assign\n"); 1413 goto fail; 1414 } 1415 ti_parent_buff = zalloc(fs->blksz); 1416 if (!ti_parent_buff) 1417 goto fail; 1418 1419 ti_pbuff_start_addr = ti_parent_buff; 1420 *ti_gp_buff = cpu_to_le32(ti_parent_blockno); 1421 ti_gp_buff++; 1422 (*no_blks_reqd)++; 1423 debug("TIPB %ld: %u\n", ti_parent_blockno, 1424 *total_remaining_blocks); 1425 1426 /* for each 4 byte entry parent create one more block */ 1427 for (j = 0; j < (fs->blksz / sizeof(int)); j++) { 1428 ti_child_blockno = ext4fs_get_new_blk_no(); 1429 if (ti_child_blockno == -1) { 1430 printf("no block left assign\n"); 1431 goto fail1; 1432 } 1433 ti_child_buff = zalloc(fs->blksz); 1434 if (!ti_child_buff) 1435 goto fail1; 1436 1437 ti_cbuff_start_addr = ti_child_buff; 1438 *ti_parent_buff = cpu_to_le32(ti_child_blockno); 1439 ti_parent_buff++; 1440 (*no_blks_reqd)++; 1441 debug("TICB %ld: %u\n", ti_parent_blockno, 1442 *total_remaining_blocks); 1443 1444 /* fill actual datablocks for each child */ 1445 for (k = 0; k < (fs->blksz / sizeof(int)); 1446 k++) { 1447 actual_block_no = 1448 ext4fs_get_new_blk_no(); 1449 if (actual_block_no == -1) { 1450 printf("no block left\n"); 1451 free(ti_cbuff_start_addr); 1452 goto fail1; 1453 } 1454 *ti_child_buff = cpu_to_le32(actual_block_no); 1455 debug("TIAB %ld: %u\n", actual_block_no, 1456 *total_remaining_blocks); 1457 1458 ti_child_buff++; 1459 (*total_remaining_blocks)--; 1460 if (*total_remaining_blocks == 0) 1461 break; 1462 } 1463 /* write the child block */ 1464 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno * 1465 (uint64_t)fs->blksz)), 1466 ti_cbuff_start_addr, fs->blksz); 1467 free(ti_cbuff_start_addr); 1468 1469 if (*total_remaining_blocks == 0) 1470 break; 1471 } 1472 /* write the parent block */ 1473 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)), 1474 ti_pbuff_start_addr, fs->blksz); 1475 free(ti_pbuff_start_addr); 1476 1477 if (*total_remaining_blocks == 0) 1478 break; 1479 } 1480 /* write the grand parent block */ 1481 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)), 1482 ti_gp_buff_start_addr, fs->blksz); 1483 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno); 1484 free(ti_gp_buff_start_addr); 1485 return; 1486 } 1487 fail1: 1488 free(ti_pbuff_start_addr); 1489 fail: 1490 free(ti_gp_buff_start_addr); 1491 } 1492 1493 void ext4fs_allocate_blocks(struct ext2_inode *file_inode, 1494 unsigned int total_remaining_blocks, 1495 unsigned int *total_no_of_block) 1496 { 1497 short i; 1498 long int direct_blockno; 1499 unsigned int no_blks_reqd = 0; 1500 1501 /* allocation of direct blocks */ 1502 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) { 1503 direct_blockno = ext4fs_get_new_blk_no(); 1504 if (direct_blockno == -1) { 1505 printf("no block left to assign\n"); 1506 return; 1507 } 1508 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno); 1509 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks); 1510 1511 total_remaining_blocks--; 1512 } 1513 1514 alloc_single_indirect_block(file_inode, &total_remaining_blocks, 1515 &no_blks_reqd); 1516 alloc_double_indirect_block(file_inode, &total_remaining_blocks, 1517 &no_blks_reqd); 1518 alloc_triple_indirect_block(file_inode, &total_remaining_blocks, 1519 &no_blks_reqd); 1520 *total_no_of_block += no_blks_reqd; 1521 } 1522 1523 #endif 1524 1525 static struct ext4_extent_header *ext4fs_get_extent_block 1526 (struct ext2_data *data, char *buf, 1527 struct ext4_extent_header *ext_block, 1528 uint32_t fileblock, int log2_blksz) 1529 { 1530 struct ext4_extent_idx *index; 1531 unsigned long long block; 1532 int blksz = EXT2_BLOCK_SIZE(data); 1533 int i; 1534 1535 while (1) { 1536 index = (struct ext4_extent_idx *)(ext_block + 1); 1537 1538 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC) 1539 return NULL; 1540 1541 if (ext_block->eh_depth == 0) 1542 return ext_block; 1543 i = -1; 1544 do { 1545 i++; 1546 if (i >= le16_to_cpu(ext_block->eh_entries)) 1547 break; 1548 } while (fileblock >= le32_to_cpu(index[i].ei_block)); 1549 1550 if (--i < 0) 1551 return NULL; 1552 1553 block = le16_to_cpu(index[i].ei_leaf_hi); 1554 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo); 1555 1556 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz, 1557 buf)) 1558 ext_block = (struct ext4_extent_header *)buf; 1559 else 1560 return NULL; 1561 } 1562 } 1563 1564 static int ext4fs_blockgroup 1565 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) 1566 { 1567 long int blkno; 1568 unsigned int blkoff, desc_per_blk; 1569 int log2blksz = get_fs()->dev_desc->log2blksz; 1570 int desc_size = get_fs()->gdsize; 1571 1572 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size; 1573 1574 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 + 1575 group / desc_per_blk; 1576 blkoff = (group % desc_per_blk) * desc_size; 1577 1578 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n", 1579 group, blkno, blkoff); 1580 1581 return ext4fs_devread((lbaint_t)blkno << 1582 (LOG2_BLOCK_SIZE(data) - log2blksz), 1583 blkoff, desc_size, (char *)blkgrp); 1584 } 1585 1586 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode) 1587 { 1588 struct ext2_block_group blkgrp; 1589 struct ext2_sblock *sblock = &data->sblock; 1590 struct ext_filesystem *fs = get_fs(); 1591 int log2blksz = get_fs()->dev_desc->log2blksz; 1592 int inodes_per_block, status; 1593 long int blkno; 1594 unsigned int blkoff; 1595 1596 /* It is easier to calculate if the first inode is 0. */ 1597 ino--; 1598 status = ext4fs_blockgroup(data, ino / le32_to_cpu 1599 (sblock->inodes_per_group), &blkgrp); 1600 if (status == 0) 1601 return 0; 1602 1603 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz; 1604 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) + 1605 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block; 1606 blkoff = (ino % inodes_per_block) * fs->inodesz; 1607 /* Read the inode. */ 1608 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) - 1609 log2blksz), blkoff, 1610 sizeof(struct ext2_inode), (char *)inode); 1611 if (status == 0) 1612 return 0; 1613 1614 return 1; 1615 } 1616 1617 long int read_allocated_block(struct ext2_inode *inode, int fileblock) 1618 { 1619 long int blknr; 1620 int blksz; 1621 int log2_blksz; 1622 int status; 1623 long int rblock; 1624 long int perblock_parent; 1625 long int perblock_child; 1626 unsigned long long start; 1627 /* get the blocksize of the filesystem */ 1628 blksz = EXT2_BLOCK_SIZE(ext4fs_root); 1629 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root) 1630 - get_fs()->dev_desc->log2blksz; 1631 1632 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) { 1633 long int startblock, endblock; 1634 char *buf = zalloc(blksz); 1635 if (!buf) 1636 return -ENOMEM; 1637 struct ext4_extent_header *ext_block; 1638 struct ext4_extent *extent; 1639 int i; 1640 ext_block = 1641 ext4fs_get_extent_block(ext4fs_root, buf, 1642 (struct ext4_extent_header *) 1643 inode->b.blocks.dir_blocks, 1644 fileblock, log2_blksz); 1645 if (!ext_block) { 1646 printf("invalid extent block\n"); 1647 free(buf); 1648 return -EINVAL; 1649 } 1650 1651 extent = (struct ext4_extent *)(ext_block + 1); 1652 1653 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) { 1654 startblock = le32_to_cpu(extent[i].ee_block); 1655 endblock = startblock + le16_to_cpu(extent[i].ee_len); 1656 1657 if (startblock > fileblock) { 1658 /* Sparse file */ 1659 free(buf); 1660 return 0; 1661 1662 } else if (fileblock < endblock) { 1663 start = le16_to_cpu(extent[i].ee_start_hi); 1664 start = (start << 32) + 1665 le32_to_cpu(extent[i].ee_start_lo); 1666 free(buf); 1667 return (fileblock - startblock) + start; 1668 } 1669 } 1670 1671 free(buf); 1672 return 0; 1673 } 1674 1675 /* Direct blocks. */ 1676 if (fileblock < INDIRECT_BLOCKS) 1677 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]); 1678 1679 /* Indirect. */ 1680 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) { 1681 if (ext4fs_indir1_block == NULL) { 1682 ext4fs_indir1_block = zalloc(blksz); 1683 if (ext4fs_indir1_block == NULL) { 1684 printf("** SI ext2fs read block (indir 1)" 1685 "malloc failed. **\n"); 1686 return -1; 1687 } 1688 ext4fs_indir1_size = blksz; 1689 ext4fs_indir1_blkno = -1; 1690 } 1691 if (blksz != ext4fs_indir1_size) { 1692 free(ext4fs_indir1_block); 1693 ext4fs_indir1_block = NULL; 1694 ext4fs_indir1_size = 0; 1695 ext4fs_indir1_blkno = -1; 1696 ext4fs_indir1_block = zalloc(blksz); 1697 if (ext4fs_indir1_block == NULL) { 1698 printf("** SI ext2fs read block (indir 1):" 1699 "malloc failed. **\n"); 1700 return -1; 1701 } 1702 ext4fs_indir1_size = blksz; 1703 } 1704 if ((le32_to_cpu(inode->b.blocks.indir_block) << 1705 log2_blksz) != ext4fs_indir1_blkno) { 1706 status = 1707 ext4fs_devread((lbaint_t)le32_to_cpu 1708 (inode->b.blocks. 1709 indir_block) << log2_blksz, 0, 1710 blksz, (char *)ext4fs_indir1_block); 1711 if (status == 0) { 1712 printf("** SI ext2fs read block (indir 1)" 1713 "failed. **\n"); 1714 return -1; 1715 } 1716 ext4fs_indir1_blkno = 1717 le32_to_cpu(inode->b.blocks. 1718 indir_block) << log2_blksz; 1719 } 1720 blknr = le32_to_cpu(ext4fs_indir1_block 1721 [fileblock - INDIRECT_BLOCKS]); 1722 } 1723 /* Double indirect. */ 1724 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 * 1725 (blksz / 4 + 1)))) { 1726 1727 long int perblock = blksz / 4; 1728 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4); 1729 1730 if (ext4fs_indir1_block == NULL) { 1731 ext4fs_indir1_block = zalloc(blksz); 1732 if (ext4fs_indir1_block == NULL) { 1733 printf("** DI ext2fs read block (indir 2 1)" 1734 "malloc failed. **\n"); 1735 return -1; 1736 } 1737 ext4fs_indir1_size = blksz; 1738 ext4fs_indir1_blkno = -1; 1739 } 1740 if (blksz != ext4fs_indir1_size) { 1741 free(ext4fs_indir1_block); 1742 ext4fs_indir1_block = NULL; 1743 ext4fs_indir1_size = 0; 1744 ext4fs_indir1_blkno = -1; 1745 ext4fs_indir1_block = zalloc(blksz); 1746 if (ext4fs_indir1_block == NULL) { 1747 printf("** DI ext2fs read block (indir 2 1)" 1748 "malloc failed. **\n"); 1749 return -1; 1750 } 1751 ext4fs_indir1_size = blksz; 1752 } 1753 if ((le32_to_cpu(inode->b.blocks.double_indir_block) << 1754 log2_blksz) != ext4fs_indir1_blkno) { 1755 status = 1756 ext4fs_devread((lbaint_t)le32_to_cpu 1757 (inode->b.blocks. 1758 double_indir_block) << log2_blksz, 1759 0, blksz, 1760 (char *)ext4fs_indir1_block); 1761 if (status == 0) { 1762 printf("** DI ext2fs read block (indir 2 1)" 1763 "failed. **\n"); 1764 return -1; 1765 } 1766 ext4fs_indir1_blkno = 1767 le32_to_cpu(inode->b.blocks.double_indir_block) << 1768 log2_blksz; 1769 } 1770 1771 if (ext4fs_indir2_block == NULL) { 1772 ext4fs_indir2_block = zalloc(blksz); 1773 if (ext4fs_indir2_block == NULL) { 1774 printf("** DI ext2fs read block (indir 2 2)" 1775 "malloc failed. **\n"); 1776 return -1; 1777 } 1778 ext4fs_indir2_size = blksz; 1779 ext4fs_indir2_blkno = -1; 1780 } 1781 if (blksz != ext4fs_indir2_size) { 1782 free(ext4fs_indir2_block); 1783 ext4fs_indir2_block = NULL; 1784 ext4fs_indir2_size = 0; 1785 ext4fs_indir2_blkno = -1; 1786 ext4fs_indir2_block = zalloc(blksz); 1787 if (ext4fs_indir2_block == NULL) { 1788 printf("** DI ext2fs read block (indir 2 2)" 1789 "malloc failed. **\n"); 1790 return -1; 1791 } 1792 ext4fs_indir2_size = blksz; 1793 } 1794 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) << 1795 log2_blksz) != ext4fs_indir2_blkno) { 1796 status = ext4fs_devread((lbaint_t)le32_to_cpu 1797 (ext4fs_indir1_block 1798 [rblock / 1799 perblock]) << log2_blksz, 0, 1800 blksz, 1801 (char *)ext4fs_indir2_block); 1802 if (status == 0) { 1803 printf("** DI ext2fs read block (indir 2 2)" 1804 "failed. **\n"); 1805 return -1; 1806 } 1807 ext4fs_indir2_blkno = 1808 le32_to_cpu(ext4fs_indir1_block[rblock 1809 / 1810 perblock]) << 1811 log2_blksz; 1812 } 1813 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]); 1814 } 1815 /* Tripple indirect. */ 1816 else { 1817 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 + 1818 (blksz / 4 * blksz / 4)); 1819 perblock_child = blksz / 4; 1820 perblock_parent = ((blksz / 4) * (blksz / 4)); 1821 1822 if (ext4fs_indir1_block == NULL) { 1823 ext4fs_indir1_block = zalloc(blksz); 1824 if (ext4fs_indir1_block == NULL) { 1825 printf("** TI ext2fs read block (indir 2 1)" 1826 "malloc failed. **\n"); 1827 return -1; 1828 } 1829 ext4fs_indir1_size = blksz; 1830 ext4fs_indir1_blkno = -1; 1831 } 1832 if (blksz != ext4fs_indir1_size) { 1833 free(ext4fs_indir1_block); 1834 ext4fs_indir1_block = NULL; 1835 ext4fs_indir1_size = 0; 1836 ext4fs_indir1_blkno = -1; 1837 ext4fs_indir1_block = zalloc(blksz); 1838 if (ext4fs_indir1_block == NULL) { 1839 printf("** TI ext2fs read block (indir 2 1)" 1840 "malloc failed. **\n"); 1841 return -1; 1842 } 1843 ext4fs_indir1_size = blksz; 1844 } 1845 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) << 1846 log2_blksz) != ext4fs_indir1_blkno) { 1847 status = ext4fs_devread 1848 ((lbaint_t) 1849 le32_to_cpu(inode->b.blocks.triple_indir_block) 1850 << log2_blksz, 0, blksz, 1851 (char *)ext4fs_indir1_block); 1852 if (status == 0) { 1853 printf("** TI ext2fs read block (indir 2 1)" 1854 "failed. **\n"); 1855 return -1; 1856 } 1857 ext4fs_indir1_blkno = 1858 le32_to_cpu(inode->b.blocks.triple_indir_block) << 1859 log2_blksz; 1860 } 1861 1862 if (ext4fs_indir2_block == NULL) { 1863 ext4fs_indir2_block = zalloc(blksz); 1864 if (ext4fs_indir2_block == NULL) { 1865 printf("** TI ext2fs read block (indir 2 2)" 1866 "malloc failed. **\n"); 1867 return -1; 1868 } 1869 ext4fs_indir2_size = blksz; 1870 ext4fs_indir2_blkno = -1; 1871 } 1872 if (blksz != ext4fs_indir2_size) { 1873 free(ext4fs_indir2_block); 1874 ext4fs_indir2_block = NULL; 1875 ext4fs_indir2_size = 0; 1876 ext4fs_indir2_blkno = -1; 1877 ext4fs_indir2_block = zalloc(blksz); 1878 if (ext4fs_indir2_block == NULL) { 1879 printf("** TI ext2fs read block (indir 2 2)" 1880 "malloc failed. **\n"); 1881 return -1; 1882 } 1883 ext4fs_indir2_size = blksz; 1884 } 1885 if ((le32_to_cpu(ext4fs_indir1_block[rblock / 1886 perblock_parent]) << 1887 log2_blksz) 1888 != ext4fs_indir2_blkno) { 1889 status = ext4fs_devread((lbaint_t)le32_to_cpu 1890 (ext4fs_indir1_block 1891 [rblock / 1892 perblock_parent]) << 1893 log2_blksz, 0, blksz, 1894 (char *)ext4fs_indir2_block); 1895 if (status == 0) { 1896 printf("** TI ext2fs read block (indir 2 2)" 1897 "failed. **\n"); 1898 return -1; 1899 } 1900 ext4fs_indir2_blkno = 1901 le32_to_cpu(ext4fs_indir1_block[rblock / 1902 perblock_parent]) 1903 << log2_blksz; 1904 } 1905 1906 if (ext4fs_indir3_block == NULL) { 1907 ext4fs_indir3_block = zalloc(blksz); 1908 if (ext4fs_indir3_block == NULL) { 1909 printf("** TI ext2fs read block (indir 2 2)" 1910 "malloc failed. **\n"); 1911 return -1; 1912 } 1913 ext4fs_indir3_size = blksz; 1914 ext4fs_indir3_blkno = -1; 1915 } 1916 if (blksz != ext4fs_indir3_size) { 1917 free(ext4fs_indir3_block); 1918 ext4fs_indir3_block = NULL; 1919 ext4fs_indir3_size = 0; 1920 ext4fs_indir3_blkno = -1; 1921 ext4fs_indir3_block = zalloc(blksz); 1922 if (ext4fs_indir3_block == NULL) { 1923 printf("** TI ext2fs read block (indir 2 2)" 1924 "malloc failed. **\n"); 1925 return -1; 1926 } 1927 ext4fs_indir3_size = blksz; 1928 } 1929 if ((le32_to_cpu(ext4fs_indir2_block[rblock 1930 / 1931 perblock_child]) << 1932 log2_blksz) != ext4fs_indir3_blkno) { 1933 status = 1934 ext4fs_devread((lbaint_t)le32_to_cpu 1935 (ext4fs_indir2_block 1936 [(rblock / perblock_child) 1937 % (blksz / 4)]) << log2_blksz, 0, 1938 blksz, (char *)ext4fs_indir3_block); 1939 if (status == 0) { 1940 printf("** TI ext2fs read block (indir 2 2)" 1941 "failed. **\n"); 1942 return -1; 1943 } 1944 ext4fs_indir3_blkno = 1945 le32_to_cpu(ext4fs_indir2_block[(rblock / 1946 perblock_child) % 1947 (blksz / 1948 4)]) << 1949 log2_blksz; 1950 } 1951 1952 blknr = le32_to_cpu(ext4fs_indir3_block 1953 [rblock % perblock_child]); 1954 } 1955 debug("read_allocated_block %ld\n", blknr); 1956 1957 return blknr; 1958 } 1959 1960 /** 1961 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's 1962 * global pointers 1963 * 1964 * This function assures that for a file with the same name but different size 1965 * the sequential store on the ext4 filesystem will be correct. 1966 * 1967 * In this function the global data, responsible for internal representation 1968 * of the ext4 data are initialized to the reset state. Without this, during 1969 * replacement of the smaller file with the bigger truncation of new file was 1970 * performed. 1971 */ 1972 void ext4fs_reinit_global(void) 1973 { 1974 if (ext4fs_indir1_block != NULL) { 1975 free(ext4fs_indir1_block); 1976 ext4fs_indir1_block = NULL; 1977 ext4fs_indir1_size = 0; 1978 ext4fs_indir1_blkno = -1; 1979 } 1980 if (ext4fs_indir2_block != NULL) { 1981 free(ext4fs_indir2_block); 1982 ext4fs_indir2_block = NULL; 1983 ext4fs_indir2_size = 0; 1984 ext4fs_indir2_blkno = -1; 1985 } 1986 if (ext4fs_indir3_block != NULL) { 1987 free(ext4fs_indir3_block); 1988 ext4fs_indir3_block = NULL; 1989 ext4fs_indir3_size = 0; 1990 ext4fs_indir3_blkno = -1; 1991 } 1992 } 1993 void ext4fs_close(void) 1994 { 1995 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { 1996 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); 1997 ext4fs_file = NULL; 1998 } 1999 if (ext4fs_root != NULL) { 2000 free(ext4fs_root); 2001 ext4fs_root = NULL; 2002 } 2003 2004 ext4fs_reinit_global(); 2005 } 2006 2007 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, 2008 struct ext2fs_node **fnode, int *ftype) 2009 { 2010 unsigned int fpos = 0; 2011 int status; 2012 loff_t actread; 2013 struct ext2fs_node *diro = (struct ext2fs_node *) dir; 2014 2015 #ifdef DEBUG 2016 if (name != NULL) 2017 printf("Iterate dir %s\n", name); 2018 #endif /* of DEBUG */ 2019 if (!diro->inode_read) { 2020 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2021 if (status == 0) 2022 return 0; 2023 } 2024 /* Search the file. */ 2025 while (fpos < le32_to_cpu(diro->inode.size)) { 2026 struct ext2_dirent dirent; 2027 2028 status = ext4fs_read_file(diro, fpos, 2029 sizeof(struct ext2_dirent), 2030 (char *)&dirent, &actread); 2031 if (status < 0) 2032 return 0; 2033 2034 if (dirent.direntlen == 0) { 2035 printf("Failed to iterate over directory %s\n", name); 2036 return 0; 2037 } 2038 2039 if (dirent.namelen != 0) { 2040 char filename[dirent.namelen + 1]; 2041 struct ext2fs_node *fdiro; 2042 int type = FILETYPE_UNKNOWN; 2043 2044 status = ext4fs_read_file(diro, 2045 fpos + 2046 sizeof(struct ext2_dirent), 2047 dirent.namelen, filename, 2048 &actread); 2049 if (status < 0) 2050 return 0; 2051 2052 fdiro = zalloc(sizeof(struct ext2fs_node)); 2053 if (!fdiro) 2054 return 0; 2055 2056 fdiro->data = diro->data; 2057 fdiro->ino = le32_to_cpu(dirent.inode); 2058 2059 filename[dirent.namelen] = '\0'; 2060 2061 if (dirent.filetype != FILETYPE_UNKNOWN) { 2062 fdiro->inode_read = 0; 2063 2064 if (dirent.filetype == FILETYPE_DIRECTORY) 2065 type = FILETYPE_DIRECTORY; 2066 else if (dirent.filetype == FILETYPE_SYMLINK) 2067 type = FILETYPE_SYMLINK; 2068 else if (dirent.filetype == FILETYPE_REG) 2069 type = FILETYPE_REG; 2070 } else { 2071 status = ext4fs_read_inode(diro->data, 2072 le32_to_cpu 2073 (dirent.inode), 2074 &fdiro->inode); 2075 if (status == 0) { 2076 free(fdiro); 2077 return 0; 2078 } 2079 fdiro->inode_read = 1; 2080 2081 if ((le16_to_cpu(fdiro->inode.mode) & 2082 FILETYPE_INO_MASK) == 2083 FILETYPE_INO_DIRECTORY) { 2084 type = FILETYPE_DIRECTORY; 2085 } else if ((le16_to_cpu(fdiro->inode.mode) 2086 & FILETYPE_INO_MASK) == 2087 FILETYPE_INO_SYMLINK) { 2088 type = FILETYPE_SYMLINK; 2089 } else if ((le16_to_cpu(fdiro->inode.mode) 2090 & FILETYPE_INO_MASK) == 2091 FILETYPE_INO_REG) { 2092 type = FILETYPE_REG; 2093 } 2094 } 2095 #ifdef DEBUG 2096 printf("iterate >%s<\n", filename); 2097 #endif /* of DEBUG */ 2098 if ((name != NULL) && (fnode != NULL) 2099 && (ftype != NULL)) { 2100 if (strcmp(filename, name) == 0) { 2101 *ftype = type; 2102 *fnode = fdiro; 2103 return 1; 2104 } 2105 } else { 2106 if (fdiro->inode_read == 0) { 2107 status = ext4fs_read_inode(diro->data, 2108 le32_to_cpu( 2109 dirent.inode), 2110 &fdiro->inode); 2111 if (status == 0) { 2112 free(fdiro); 2113 return 0; 2114 } 2115 fdiro->inode_read = 1; 2116 } 2117 switch (type) { 2118 case FILETYPE_DIRECTORY: 2119 printf("<DIR> "); 2120 break; 2121 case FILETYPE_SYMLINK: 2122 printf("<SYM> "); 2123 break; 2124 case FILETYPE_REG: 2125 printf(" "); 2126 break; 2127 default: 2128 printf("< ? > "); 2129 break; 2130 } 2131 printf("%10u %s\n", 2132 le32_to_cpu(fdiro->inode.size), 2133 filename); 2134 } 2135 free(fdiro); 2136 } 2137 fpos += le16_to_cpu(dirent.direntlen); 2138 } 2139 return 0; 2140 } 2141 2142 static char *ext4fs_read_symlink(struct ext2fs_node *node) 2143 { 2144 char *symlink; 2145 struct ext2fs_node *diro = node; 2146 int status; 2147 loff_t actread; 2148 2149 if (!diro->inode_read) { 2150 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); 2151 if (status == 0) 2152 return NULL; 2153 } 2154 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); 2155 if (!symlink) 2156 return NULL; 2157 2158 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) { 2159 strncpy(symlink, diro->inode.b.symlink, 2160 le32_to_cpu(diro->inode.size)); 2161 } else { 2162 status = ext4fs_read_file(diro, 0, 2163 le32_to_cpu(diro->inode.size), 2164 symlink, &actread); 2165 if ((status < 0) || (actread == 0)) { 2166 free(symlink); 2167 return NULL; 2168 } 2169 } 2170 symlink[le32_to_cpu(diro->inode.size)] = '\0'; 2171 return symlink; 2172 } 2173 2174 static int ext4fs_find_file1(const char *currpath, 2175 struct ext2fs_node *currroot, 2176 struct ext2fs_node **currfound, int *foundtype) 2177 { 2178 char fpath[strlen(currpath) + 1]; 2179 char *name = fpath; 2180 char *next; 2181 int status; 2182 int type = FILETYPE_DIRECTORY; 2183 struct ext2fs_node *currnode = currroot; 2184 struct ext2fs_node *oldnode = currroot; 2185 2186 strncpy(fpath, currpath, strlen(currpath) + 1); 2187 2188 /* Remove all leading slashes. */ 2189 while (*name == '/') 2190 name++; 2191 2192 if (!*name) { 2193 *currfound = currnode; 2194 return 1; 2195 } 2196 2197 for (;;) { 2198 int found; 2199 2200 /* Extract the actual part from the pathname. */ 2201 next = strchr(name, '/'); 2202 if (next) { 2203 /* Remove all leading slashes. */ 2204 while (*next == '/') 2205 *(next++) = '\0'; 2206 } 2207 2208 if (type != FILETYPE_DIRECTORY) { 2209 ext4fs_free_node(currnode, currroot); 2210 return 0; 2211 } 2212 2213 oldnode = currnode; 2214 2215 /* Iterate over the directory. */ 2216 found = ext4fs_iterate_dir(currnode, name, &currnode, &type); 2217 if (found == 0) 2218 return 0; 2219 2220 if (found == -1) 2221 break; 2222 2223 /* Read in the symlink and follow it. */ 2224 if (type == FILETYPE_SYMLINK) { 2225 char *symlink; 2226 2227 /* Test if the symlink does not loop. */ 2228 if (++symlinknest == 8) { 2229 ext4fs_free_node(currnode, currroot); 2230 ext4fs_free_node(oldnode, currroot); 2231 return 0; 2232 } 2233 2234 symlink = ext4fs_read_symlink(currnode); 2235 ext4fs_free_node(currnode, currroot); 2236 2237 if (!symlink) { 2238 ext4fs_free_node(oldnode, currroot); 2239 return 0; 2240 } 2241 2242 debug("Got symlink >%s<\n", symlink); 2243 2244 if (symlink[0] == '/') { 2245 ext4fs_free_node(oldnode, currroot); 2246 oldnode = &ext4fs_root->diropen; 2247 } 2248 2249 /* Lookup the node the symlink points to. */ 2250 status = ext4fs_find_file1(symlink, oldnode, 2251 &currnode, &type); 2252 2253 free(symlink); 2254 2255 if (status == 0) { 2256 ext4fs_free_node(oldnode, currroot); 2257 return 0; 2258 } 2259 } 2260 2261 ext4fs_free_node(oldnode, currroot); 2262 2263 /* Found the node! */ 2264 if (!next || *next == '\0') { 2265 *currfound = currnode; 2266 *foundtype = type; 2267 return 1; 2268 } 2269 name = next; 2270 } 2271 return -1; 2272 } 2273 2274 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode, 2275 struct ext2fs_node **foundnode, int expecttype) 2276 { 2277 int status; 2278 int foundtype = FILETYPE_DIRECTORY; 2279 2280 symlinknest = 0; 2281 if (!path) 2282 return 0; 2283 2284 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype); 2285 if (status == 0) 2286 return 0; 2287 2288 /* Check if the node that was found was of the expected type. */ 2289 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype)) 2290 return 0; 2291 else if ((expecttype == FILETYPE_DIRECTORY) 2292 && (foundtype != expecttype)) 2293 return 0; 2294 2295 return 1; 2296 } 2297 2298 int ext4fs_open(const char *filename, loff_t *len) 2299 { 2300 struct ext2fs_node *fdiro = NULL; 2301 int status; 2302 2303 if (ext4fs_root == NULL) 2304 return -1; 2305 2306 ext4fs_file = NULL; 2307 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro, 2308 FILETYPE_REG); 2309 if (status == 0) 2310 goto fail; 2311 2312 if (!fdiro->inode_read) { 2313 status = ext4fs_read_inode(fdiro->data, fdiro->ino, 2314 &fdiro->inode); 2315 if (status == 0) 2316 goto fail; 2317 } 2318 *len = le32_to_cpu(fdiro->inode.size); 2319 ext4fs_file = fdiro; 2320 2321 return 0; 2322 fail: 2323 ext4fs_free_node(fdiro, &ext4fs_root->diropen); 2324 2325 return -1; 2326 } 2327 2328 int ext4fs_mount(unsigned part_length) 2329 { 2330 struct ext2_data *data; 2331 int status; 2332 struct ext_filesystem *fs = get_fs(); 2333 data = zalloc(SUPERBLOCK_SIZE); 2334 if (!data) 2335 return 0; 2336 2337 /* Read the superblock. */ 2338 status = ext4_read_superblock((char *)&data->sblock); 2339 2340 if (status == 0) 2341 goto fail; 2342 2343 /* Make sure this is an ext2 filesystem. */ 2344 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC) 2345 goto fail_noerr; 2346 2347 2348 if (le32_to_cpu(data->sblock.revision_level) == 0) { 2349 fs->inodesz = 128; 2350 fs->gdsize = 32; 2351 } else { 2352 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", 2353 __le32_to_cpu(data->sblock.feature_compatibility), 2354 __le32_to_cpu(data->sblock.feature_incompat), 2355 __le32_to_cpu(data->sblock.feature_ro_compat)); 2356 2357 fs->inodesz = le16_to_cpu(data->sblock.inode_size); 2358 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) & 2359 EXT4_FEATURE_INCOMPAT_64BIT ? 2360 le16_to_cpu(data->sblock.descriptor_size) : 32; 2361 } 2362 2363 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n", 2364 le32_to_cpu(data->sblock.revision_level), 2365 fs->inodesz, fs->gdsize); 2366 2367 data->diropen.data = data; 2368 data->diropen.ino = 2; 2369 data->diropen.inode_read = 1; 2370 data->inode = &data->diropen.inode; 2371 2372 status = ext4fs_read_inode(data, 2, data->inode); 2373 if (status == 0) 2374 goto fail; 2375 2376 ext4fs_root = data; 2377 2378 return 1; 2379 fail: 2380 printf("Failed to mount ext2 filesystem...\n"); 2381 fail_noerr: 2382 free(data); 2383 ext4fs_root = NULL; 2384 2385 return 0; 2386 } 2387
