ext4fixup.c revision 671cd2188e2f224aaeac4955785199f228235719
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16#include "ext4_utils.h" 17#include "make_ext4fs.h" 18#include "ext4_extents.h" 19#include "output_file.h" 20#include "backed_block.h" 21#include "allocate.h" 22#include "ext4fixup.h" 23 24#include <sys/types.h> 25#include <sys/stat.h> 26#include <sys/types.h> 27#include <sys/mman.h> 28#include <fcntl.h> 29#include <unistd.h> 30 31#if defined(__APPLE__) && defined(__MACH__) 32#define lseek64 lseek 33#define off64_t off_t 34#endif 35 36/* The inode block count for a file/directory is in units of 512 byte blocks, 37 * _NOT_ the filesystem block size! 38 */ 39#define INODE_BLOCK_SIZE 512 40 41#define MAX_EXT4_BLOCK_SIZE 4096 42 43/* The two modes the recurse_dir() can be in */ 44#define SANITY_CHECK_PASS 1 45#define MARK_INODE_NUMS 2 46#define UPDATE_INODE_NUMS 3 47 48/* Magic numbers to indicate what state the update process is in */ 49#define MAGIC_STATE_MARKING_INUMS 0x7000151515565512ll 50#define MAGIC_STATE_UPDATING_INUMS 0x6121131211735123ll 51#define MAGIC_STATE_UPDATING_SB 0x15e1715151558477ll 52 53/* Internal state variables corresponding to the magic numbers */ 54#define STATE_UNSET 0 55#define STATE_MARKING_INUMS 1 56#define STATE_UPDATING_INUMS 2 57#define STATE_UPDATING_SB 3 58 59static int verbose = 0; 60static int no_write = 0; 61static int new_inodes_per_group = 0; 62static int no_write_fixup_state = 0; 63 64static int compute_new_inum(unsigned int old_inum) 65{ 66 unsigned int group, offset; 67 68 group = old_inum / info.inodes_per_group; 69 offset = old_inum % info.inodes_per_group; 70 71 return (group * new_inodes_per_group) + offset; 72} 73 74/* Function to read the primary superblock */ 75static void read_sb(int fd, struct ext4_super_block *sb) 76{ 77 off64_t ret; 78 79 ret = lseek64(fd, 1024, SEEK_SET); 80 if (ret < 0) 81 critical_error_errno("failed to seek to superblock"); 82 83 ret = read(fd, sb, sizeof(*sb)); 84 if (ret < 0) 85 critical_error_errno("failed to read superblock"); 86 if (ret != sizeof(*sb)) 87 critical_error("failed to read all of superblock"); 88} 89 90/* Function to write a primary or backup superblock at a given offset */ 91static void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb) 92{ 93 off64_t ret; 94 95 if (no_write) { 96 return; 97 } 98 99 ret = lseek64(fd, offset, SEEK_SET); 100 if (ret < 0) 101 critical_error_errno("failed to seek to superblock"); 102 103 ret = write(fd, sb, sizeof(*sb)); 104 if (ret < 0) 105 critical_error_errno("failed to write superblock"); 106 if (ret != sizeof(*sb)) 107 critical_error("failed to write all of superblock"); 108} 109 110static int get_fs_fixup_state(int fd) 111{ 112 unsigned long long magic; 113 int ret, len; 114 115 if (no_write) { 116 return no_write_fixup_state; 117 } 118 119 lseek64(fd, 0, SEEK_SET); 120 len = read(fd, &magic, sizeof(magic)); 121 if (len != sizeof(magic)) { 122 critical_error("cannot read fixup_state\n"); 123 } 124 125 switch (magic) { 126 case MAGIC_STATE_MARKING_INUMS: 127 ret = STATE_MARKING_INUMS; 128 break; 129 case MAGIC_STATE_UPDATING_INUMS: 130 ret = STATE_UPDATING_INUMS; 131 break; 132 case MAGIC_STATE_UPDATING_SB: 133 ret = STATE_UPDATING_SB; 134 break; 135 default: 136 ret = STATE_UNSET; 137 } 138 return ret; 139} 140 141static int set_fs_fixup_state(int fd, int state) 142{ 143 unsigned long long magic; 144 struct ext4_super_block sb; 145 int len; 146 147 if (no_write) { 148 no_write_fixup_state = state; 149 return 0; 150 } 151 152 switch (state) { 153 case STATE_MARKING_INUMS: 154 magic = MAGIC_STATE_MARKING_INUMS; 155 break; 156 case STATE_UPDATING_INUMS: 157 magic = MAGIC_STATE_UPDATING_INUMS; 158 break; 159 case STATE_UPDATING_SB: 160 magic = MAGIC_STATE_UPDATING_SB; 161 break; 162 case STATE_UNSET: 163 default: 164 magic = 0ll; 165 break; 166 } 167 168 lseek64(fd, 0, SEEK_SET); 169 len = write(fd, &magic, sizeof(magic)); 170 if (len != sizeof(magic)) { 171 critical_error("cannot write fixup_state\n"); 172 } 173 174 read_sb(fd, &sb); 175 if (magic) { 176 /* If we are in the process of updating the filesystem, make it unmountable */ 177 sb.s_desc_size |= 1; 178 } else { 179 /* we are done, so make the filesystem mountable again */ 180 sb.s_desc_size &= ~1; 181 } 182 write_sb(fd, 1024, &sb); 183 184 return 0; 185} 186 187static int read_ext(int fd) 188{ 189 off64_t ret; 190 struct ext4_super_block sb; 191 unsigned int i; 192 193 read_sb(fd, &sb); 194 195 ext4_parse_sb(&sb); 196 197 /* Clear the low bit which is set while this tool is in progress. 198 * If the tool crashes, it will still be set when we restart. 199 * The low bit is set to make the filesystem unmountable while 200 * it is being fixed up. Also allow 0, which means the old ext2 201 * size is in use. 202 */ 203 if (((sb.s_desc_size & ~1) != sizeof(struct ext2_group_desc)) && 204 ((sb.s_desc_size & ~1) != 0)) 205 critical_error("error: bg_desc_size != sizeof(struct ext2_group_desc)\n"); 206 207 ret = lseek64(fd, info.len, SEEK_SET); 208 if (ret < 0) 209 critical_error_errno("failed to seek to end of input image"); 210 211 ret = lseek64(fd, info.block_size * (aux_info.first_data_block + 1), SEEK_SET); 212 if (ret < 0) 213 critical_error_errno("failed to seek to block group descriptors"); 214 215 ret = read(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); 216 if (ret < 0) 217 critical_error_errno("failed to read block group descriptors"); 218 if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) 219 critical_error("failed to read all of block group descriptors"); 220 221 if (verbose) { 222 printf("Found filesystem with parameters:\n"); 223 printf(" Size: %llu\n", info.len); 224 printf(" Block size: %d\n", info.block_size); 225 printf(" Blocks per group: %d\n", info.blocks_per_group); 226 printf(" Inodes per group: %d\n", info.inodes_per_group); 227 printf(" Inode size: %d\n", info.inode_size); 228 printf(" Label: %s\n", info.label); 229 printf(" Blocks: %llu\n", aux_info.len_blocks); 230 printf(" Block groups: %d\n", aux_info.groups); 231 printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); 232 printf(" Used %d/%d inodes and %d/%d blocks\n", 233 aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, 234 aux_info.sb->s_inodes_count, 235 aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, 236 aux_info.sb->s_blocks_count_lo); 237 } 238 239 return 0; 240} 241 242static int read_inode(int fd, unsigned int inum, struct ext4_inode *inode) 243{ 244 unsigned int bg_num, bg_offset; 245 off64_t inode_offset; 246 int len; 247 248 bg_num = (inum-1) / info.inodes_per_group; 249 bg_offset = (inum-1) % info.inodes_per_group; 250 251 inode_offset = ((unsigned long long)aux_info.bg_desc[bg_num].bg_inode_table * info.block_size) + 252 (bg_offset * info.inode_size); 253 254 if (lseek64(fd, inode_offset, SEEK_SET) < 0) { 255 critical_error_errno("failed to seek to inode %d\n", inum); 256 } 257 258 len=read(fd, inode, sizeof(*inode)); 259 if (len != sizeof(*inode)) { 260 critical_error_errno("failed to read inode %d\n", inum); 261 } 262 263 return 0; 264} 265 266static int read_block(int fd, unsigned long long block_num, void *block) 267{ 268 off64_t off; 269 unsigned int len; 270 271 off = block_num * info.block_size; 272 273 if (lseek64(fd, off, SEEK_SET) , 0) { 274 critical_error_errno("failed to seek to block %lld\n", block_num); 275 } 276 277 len=read(fd, block, info.block_size); 278 if (len != info.block_size) { 279 critical_error_errno("failed to read block %lld\n", block_num); 280 } 281 282 return 0; 283} 284 285static int write_block(int fd, unsigned long long block_num, void *block) 286{ 287 off64_t off; 288 unsigned int len; 289 290 if (no_write) { 291 return 0; 292 } 293 294 off = block_num * info.block_size; 295 296 if (lseek64(fd, off, SEEK_SET) < 0) { 297 critical_error_errno("failed to seek to block %lld\n", block_num); 298 } 299 300 len=write(fd, block, info.block_size); 301 if (len != info.block_size) { 302 critical_error_errno("failed to write block %lld\n", block_num); 303 } 304 305 return 0; 306} 307 308static int bitmap_get_bit(u8 *bitmap, u32 bit) 309{ 310 if (bitmap[bit / 8] & (1 << (bit % 8))) 311 return 1; 312 313 return 0; 314} 315 316static void bitmap_clear_bit(u8 *bitmap, u32 bit) 317{ 318 bitmap[bit / 8] &= ~(1 << (bit % 8)); 319 320 return; 321} 322 323static void check_inode_bitmap(int fd, unsigned int bg_num) 324{ 325 unsigned int inode_bitmap_block_num; 326 unsigned char block[MAX_EXT4_BLOCK_SIZE]; 327 int i, bitmap_updated = 0; 328 329 /* Using the bg_num, aux_info.bg_desc[], info.inodes_per_group and 330 * new_inodes_per_group, retrieve the inode bitmap, and make sure 331 * the bits between the old and new size are clear 332 */ 333 inode_bitmap_block_num = aux_info.bg_desc[bg_num].bg_inode_bitmap; 334 335 read_block(fd, inode_bitmap_block_num, block); 336 337 for (i = info.inodes_per_group; i < new_inodes_per_group; i++) { 338 if (bitmap_get_bit(block, i)) { 339 bitmap_clear_bit(block, i); 340 bitmap_updated = 1; 341 } 342 } 343 344 if (bitmap_updated) { 345 if (verbose) { 346 printf("Warning: updated inode bitmap for block group %d\n", bg_num); 347 } 348 write_block(fd, inode_bitmap_block_num, block); 349 } 350 351 return; 352} 353 354/* Update the superblock and bgdesc of the specified block group */ 355static int update_superblocks_and_bg_desc(int fd, int state) 356{ 357 off64_t ret; 358 struct ext4_super_block sb; 359 unsigned int num_block_groups, total_new_inodes; 360 unsigned int i; 361 362 363 read_sb(fd, &sb); 364 365 /* Compute how many more inodes are now available */ 366 num_block_groups = DIV_ROUND_UP(aux_info.len_blocks, info.blocks_per_group); 367 total_new_inodes = num_block_groups * (new_inodes_per_group - sb.s_inodes_per_group); 368 369 if (verbose) { 370 printf("created %d additional inodes\n", total_new_inodes); 371 } 372 373 /* Update the free inodes count in each block group descriptor */ 374 for (i = 0; i < num_block_groups; i++) { 375 if (state == STATE_UPDATING_SB) { 376 aux_info.bg_desc[i].bg_free_inodes_count += (new_inodes_per_group - sb.s_inodes_per_group); 377 } 378 check_inode_bitmap(fd, i); 379 } 380 381 /* First some sanity checks */ 382 if ((sb.s_inodes_count + total_new_inodes) != (new_inodes_per_group * num_block_groups)) { 383 critical_error("Failed sanity check on new inode count\n"); 384 } 385 if (new_inodes_per_group % (info.block_size/info.inode_size)) { 386 critical_error("Failed sanity check on new inode per group alignment\n"); 387 } 388 389 /* Update the free inodes count in the superblock */ 390 sb.s_inodes_count += total_new_inodes; 391 sb.s_free_inodes_count += total_new_inodes; 392 sb.s_inodes_per_group = new_inodes_per_group; 393 394 for (i = 0; i < aux_info.groups; i++) { 395 if (ext4_bg_has_super_block(i)) { 396 unsigned int sb_offset; 397 398 if (i == 0) { 399 /* The first superblock is offset by 1K to leave room for boot sectors */ 400 sb_offset = 1024; 401 } else { 402 sb_offset = 0; 403 } 404 405 sb.s_block_group_nr = i; 406 /* Don't write out the backup superblocks with the bit set in the s_desc_size 407 * which prevents the filesystem from mounting. The bit for the primary 408 * superblock will be cleared on the final call to set_fs_fixup_state() */ 409 if (i != 0) { 410 sb.s_desc_size &= ~1; 411 } 412 413 write_sb(fd, (unsigned long long)i * info.blocks_per_group * info.block_size + sb_offset, &sb); 414 415 ret = lseek64(fd, ((unsigned long long)i * info.blocks_per_group * info.block_size) + 416 (info.block_size * (aux_info.first_data_block + 1)), SEEK_SET); 417 if (ret < 0) 418 critical_error_errno("failed to seek to block group descriptors"); 419 420 if (!no_write) { 421 ret = write(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); 422 if (ret < 0) 423 critical_error_errno("failed to write block group descriptors"); 424 if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) 425 critical_error("failed to write all of block group descriptors"); 426 } 427 } 428 } 429 430 return 0; 431} 432 433 434static int get_direct_blocks(struct ext4_inode *inode, unsigned long long *block_list, 435 unsigned int *count) 436{ 437 unsigned int i = 0; 438 unsigned int ret = 0; 439 unsigned int sectors_per_block; 440 441 sectors_per_block = info.block_size / INODE_BLOCK_SIZE; 442 while ((i < (inode->i_blocks_lo / sectors_per_block)) && (i < EXT4_NDIR_BLOCKS)) { 443 block_list[i] = inode->i_block[i]; 444 i++; 445 } 446 447 *count += i; 448 449 if ((inode->i_blocks_lo / sectors_per_block) > EXT4_NDIR_BLOCKS) { 450 ret = 1; 451 } 452 453 return ret; 454} 455 456static int get_indirect_blocks(int fd, struct ext4_inode *inode, 457 unsigned long long *block_list, unsigned int *count) 458{ 459 unsigned int i; 460 unsigned int *indirect_block; 461 unsigned int sectors_per_block; 462 463 sectors_per_block = info.block_size / INODE_BLOCK_SIZE; 464 465 indirect_block = (unsigned int *)malloc(info.block_size); 466 if (indirect_block == 0) { 467 critical_error("failed to allocate memory for indirect_block\n"); 468 } 469 470 read_block(fd, inode->i_block[EXT4_NDIR_BLOCKS], indirect_block); 471 472 for(i = 0; i < (inode->i_blocks_lo / sectors_per_block - EXT4_NDIR_BLOCKS); i++) { 473 block_list[EXT4_NDIR_BLOCKS+i] = indirect_block[i]; 474 } 475 476 *count += i; 477 478 free(indirect_block); 479 480 return 0; 481} 482 483static int get_block_list_indirect(int fd, struct ext4_inode *inode, unsigned long long *block_list) 484{ 485 unsigned int count=0; 486 487 if (get_direct_blocks(inode, block_list, &count)) { 488 get_indirect_blocks(fd, inode, block_list, &count); 489 } 490 491 return count; 492} 493 494static int get_extent_ents(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) 495{ 496 int i, j; 497 struct ext4_extent *extent; 498 off64_t fs_block_num; 499 500 if (ext_hdr->eh_depth != 0) { 501 critical_error("get_extent_ents called with eh_depth != 0\n"); 502 } 503 504 /* The extent entries immediately follow the header, so add 1 to the pointer 505 * and cast it to an extent pointer. 506 */ 507 extent = (struct ext4_extent *)(ext_hdr + 1); 508 509 for (i = 0; i < ext_hdr->eh_entries; i++) { 510 fs_block_num = ((off64_t)extent->ee_start_hi << 32) | extent->ee_start_lo; 511 for (j = 0; j < extent->ee_len; j++) { 512 block_list[extent->ee_block+j] = fs_block_num+j; 513 } 514 extent++; 515 } 516 517 return 0; 518} 519 520static int get_extent_idx(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) 521{ 522 int i; 523 struct ext4_extent_idx *extent_idx; 524 struct ext4_extent_header *tmp_ext_hdr; 525 off64_t fs_block_num; 526 unsigned char block[MAX_EXT4_BLOCK_SIZE]; 527 528 /* Sanity check */ 529 if (ext_hdr->eh_depth == 0) { 530 critical_error("get_extent_idx called with eh_depth == 0\n"); 531 } 532 533 /* The extent entries immediately follow the header, so add 1 to the pointer 534 * and cast it to an extent pointer. 535 */ 536 extent_idx = (struct ext4_extent_idx *)(ext_hdr + 1); 537 538 for (i = 0; i < ext_hdr->eh_entries; i++) { 539 fs_block_num = ((off64_t)extent_idx->ei_leaf_hi << 32) | extent_idx->ei_leaf_lo; 540 read_block(fd, fs_block_num, block); 541 tmp_ext_hdr = (struct ext4_extent_header *)block; 542 543 if (tmp_ext_hdr->eh_depth == 0) { 544 get_extent_ents(fd, tmp_ext_hdr, block_list); /* leaf node, fill in block_list */ 545 } else { 546 get_extent_idx(fd, tmp_ext_hdr, block_list); /* recurse down the tree */ 547 } 548 } 549 550 return 0; 551} 552 553static int get_block_list_extents(int fd, struct ext4_inode *inode, unsigned long long *block_list) 554{ 555 struct ext4_extent_header *extent_hdr; 556 557 extent_hdr = (struct ext4_extent_header *)inode->i_block; 558 559 if (extent_hdr->eh_magic != EXT4_EXT_MAGIC) { 560 critical_error("extent header has unexpected magic value 0x%4.4x\n", 561 extent_hdr->eh_magic); 562 } 563 564 if (extent_hdr->eh_depth == 0) { 565 get_extent_ents(fd, (struct ext4_extent_header *)inode->i_block, block_list); 566 return 0; 567 } 568 569 get_extent_idx(fd, (struct ext4_extent_header *)inode->i_block, block_list); 570 571 return 0; 572} 573 574static int is_entry_dir(int fd, struct ext4_dir_entry_2 *dirp, int pass) 575{ 576 struct ext4_inode inode; 577 int ret = 0; 578 579 if (dirp->file_type == EXT4_FT_DIR) { 580 ret = 1; 581 } else if (dirp->file_type == EXT4_FT_UNKNOWN) { 582 /* Somebody was too lazy to fill in the dir entry, 583 * so we have to go fetch it from the inode. Grrr. 584 */ 585 /* if UPDATE_INODE_NUMS pass and the inode high bit is not 586 * set return false so we don't recurse down the tree that is 587 * already updated. Otherwise, fetch inode, and return answer. 588 */ 589 if ((pass == UPDATE_INODE_NUMS) && !(dirp->inode & 0x80000000)) { 590 ret = 0; 591 } else { 592 read_inode(fd, (dirp->inode & 0x7fffffff), &inode); 593 if (S_ISDIR(inode.i_mode)) { 594 ret = 1; 595 } 596 } 597 } 598 599 return ret; 600} 601 602static int recurse_dir(int fd, struct ext4_inode *inode, char *dirbuf, int dirsize, int mode) 603{ 604 unsigned long long *block_list; 605 unsigned int num_blocks; 606 struct ext4_dir_entry_2 *dirp, *prev_dirp = 0; 607 char name[256]; 608 unsigned int i, leftover_space, is_dir; 609 struct ext4_inode tmp_inode; 610 int tmp_dirsize; 611 char *tmp_dirbuf; 612 613 switch (mode) { 614 case SANITY_CHECK_PASS: 615 case MARK_INODE_NUMS: 616 case UPDATE_INODE_NUMS: 617 break; 618 default: 619 critical_error("recurse_dir() called witn unknown mode!\n"); 620 } 621 622 if (dirsize % info.block_size) { 623 critical_error("dirsize %d not a multiple of block_size %d. This is unexpected!\n", 624 dirsize, info.block_size); 625 } 626 627 num_blocks = dirsize / info.block_size; 628 629 block_list = malloc((num_blocks + 1) * sizeof(*block_list)); 630 if (block_list == 0) { 631 critical_error("failed to allocate memory for block_list\n"); 632 } 633 634 if (inode->i_flags & EXT4_EXTENTS_FL) { 635 get_block_list_extents(fd, inode, block_list); 636 } else { 637 /* A directory that requires doubly or triply indirect blocks in huge indeed, 638 * and will almost certainly not exist, especially since make_ext4fs only creates 639 * directories with extents, and the kernel will too, but check to make sure the 640 * directory is not that big and give an error if so. Our limit is 12 direct blocks, 641 * plus block_size/4 singly indirect blocks, which for a filesystem with 4K blocks 642 * is a directory 1036 blocks long, or 4,243,456 bytes long! Assuming an average 643 * filename length of 20 (which I think is generous) thats 20 + 8 bytes overhead 644 * per entry, or 151,552 entries in the directory! 645 */ 646 if (num_blocks > (info.block_size / 4 + EXT4_NDIR_BLOCKS)) { 647 critical_error("Non-extent based directory is too big!\n"); 648 } 649 get_block_list_indirect(fd, inode, block_list); 650 } 651 652 /* Read in all the blocks for this directory */ 653 for (i = 0; i < num_blocks; i++) { 654 read_block(fd, block_list[i], dirbuf + (i * info.block_size)); 655 } 656 657 dirp = (struct ext4_dir_entry_2 *)dirbuf; 658 while (dirp < (struct ext4_dir_entry_2 *)(dirbuf + dirsize)) { 659 leftover_space = (char *)(dirbuf + dirsize) - (char *)dirp; 660 if (((mode == SANITY_CHECK_PASS) || (mode == UPDATE_INODE_NUMS)) && 661 (leftover_space <= 8) && prev_dirp) { 662 /* This is a bug in an older version of make_ext4fs, where it 663 * didn't properly include the rest of the block in rec_len. 664 * Update rec_len on the previous entry to include the rest of 665 * the block and exit the loop. 666 */ 667 if (verbose) { 668 printf("fixing up short rec_len for diretory entry for %s\n", name); 669 } 670 prev_dirp->rec_len += leftover_space; 671 break; 672 } 673 674 if (dirp->inode == 0) { 675 /* This is the last entry in the directory */ 676 break; 677 } 678 679 strncpy(name, dirp->name, dirp->name_len); 680 name[dirp->name_len]='\0'; 681 682 /* Only recurse on pass 2 if the high bit is set. 683 * Otherwise, this inode entry has already been updated 684 * and we'll do the wrong thing. Also don't recurse on . or .., 685 * and certainly not on non-directories! 686 */ 687 /* Hrm, looks like filesystems made by fastboot on stingray set the file_type 688 * flag, but the lost+found directory has the type set to Unknown, which 689 * seems to imply I need to read the inode and get it. 690 */ 691 is_dir = is_entry_dir(fd, dirp, mode); 692 if ( is_dir && (strcmp(name, ".") && strcmp(name, "..")) && 693 ((mode == SANITY_CHECK_PASS) || (mode == MARK_INODE_NUMS) || 694 ((mode == UPDATE_INODE_NUMS) && (dirp->inode | 0x80000000))) ) { 695 /* A directory! Recurse! */ 696 read_inode(fd, dirp->inode & 0x7fffffff, &tmp_inode); 697 698 if (!S_ISDIR(tmp_inode.i_mode)) { 699 critical_error("inode %d for name %s does not point to a directory\n", 700 dirp->inode & 0x7fffffff, name); 701 } 702 if (verbose) { 703 printf("inode %d %s use extents\n", dirp->inode & 0x7fffffff, 704 (tmp_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); 705 } 706 707 tmp_dirsize = tmp_inode.i_blocks_lo * INODE_BLOCK_SIZE; 708 if (verbose) { 709 printf("dir size = %d bytes\n", tmp_dirsize); 710 } 711 712 tmp_dirbuf = malloc(tmp_dirsize); 713 if (tmp_dirbuf == 0) { 714 critical_error("failed to allocate memory for tmp_dirbuf\n"); 715 } 716 717 recurse_dir(fd, &tmp_inode, tmp_dirbuf, tmp_dirsize, mode); 718 719 free(tmp_dirbuf); 720 } 721 722 if (verbose) { 723 if (is_dir) { 724 printf("Directory %s\n", name); 725 } else { 726 printf("Non-directory %s\n", name); 727 } 728 } 729 730 /* Process entry based on current mode. Either set high bit or change inode number */ 731 if (mode == MARK_INODE_NUMS) { 732 dirp->inode |= 0x80000000; 733 } else if (mode == UPDATE_INODE_NUMS) { 734 if (dirp->inode | 0x80000000) { 735 dirp->inode = compute_new_inum(dirp->inode & 0x7fffffff); 736 } 737 } 738 739 /* Point dirp at the next entry */ 740 prev_dirp = dirp; 741 dirp = (struct ext4_dir_entry_2*)((char *)dirp + dirp->rec_len); 742 } 743 744 /* Write out all the blocks for this directory */ 745 for (i = 0; i < num_blocks; i++) { 746 write_block(fd, block_list[i], dirbuf + (i * info.block_size)); 747 } 748 749 free(block_list); 750 751 return 0; 752} 753 754int ext4fixup(char *fsdev) 755{ 756 return ext4fixup_internal(fsdev, 0, 0); 757} 758 759int ext4fixup_internal(char *fsdev, int v_flag, int n_flag) 760{ 761 int fd; 762 struct ext4_inode root_inode; 763 unsigned int dirsize; 764 char *dirbuf; 765 766 if (setjmp(setjmp_env)) 767 return EXIT_FAILURE; /* Handle a call to longjmp() */ 768 769 verbose = v_flag; 770 no_write = n_flag; 771 772 fd = open(fsdev, O_RDWR); 773 774 if (fd < 0) 775 critical_error_errno("failed to open filesystem image"); 776 777 read_ext(fd); 778 779 if ((info.feat_incompat & EXT4_FEATURE_INCOMPAT_FILETYPE) == 0) { 780 critical_error("Expected filesystem to have filetype flag set\n"); 781 } 782 783#if 0 // If we have to fix the directory rec_len issue, we can't use this check 784 /* Check to see if the inodes/group is copacetic */ 785 if (info.inodes_per_blockgroup % (info.block_size/info.inode_size) == 0) { 786 /* This filesystem has either already been updated, or was 787 * made correctly. 788 */ 789 if (verbose) { 790 printf("%s: filesystem correct, no work to do\n", me); 791 } 792 exit(0); 793 } 794#endif 795 796 /* Compute what the new value of inodes_per_blockgroup will be when we're done */ 797 new_inodes_per_group=ALIGN(info.inodes_per_group,(info.block_size/info.inode_size)); 798 799 read_inode(fd, EXT4_ROOT_INO, &root_inode); 800 801 if (!S_ISDIR(root_inode.i_mode)) { 802 critical_error("root inode %d does not point to a directory\n", EXT4_ROOT_INO); 803 } 804 if (verbose) { 805 printf("inode %d %s use extents\n", EXT4_ROOT_INO, 806 (root_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); 807 } 808 809 dirsize = root_inode.i_blocks_lo * INODE_BLOCK_SIZE; 810 if (verbose) { 811 printf("root dir size = %d bytes\n", dirsize); 812 } 813 814 dirbuf = malloc(dirsize); 815 if (dirbuf == 0) { 816 critical_error("failed to allocate memory for dirbuf\n"); 817 } 818 819 /* Perform a sanity check pass first, try to catch any errors that will occur 820 * before we actually change anything, so we don't leave a filesystem in a 821 * corrupted, unrecoverable state. Set no_write, make it quiet, and do a recurse 822 * pass and a update_superblock pass. Set flags back to requested state when done. 823 */ 824 verbose = 0; 825 no_write = 1; 826 recurse_dir(fd, &root_inode, dirbuf, dirsize, SANITY_CHECK_PASS); 827 update_superblocks_and_bg_desc(fd, STATE_UNSET); 828 verbose = v_flag; 829 no_write = n_flag; 830 831 if (get_fs_fixup_state(fd) == STATE_UNSET) { 832 set_fs_fixup_state(fd, STATE_MARKING_INUMS); 833 } 834 835 if (get_fs_fixup_state(fd) == STATE_MARKING_INUMS) { 836 if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, MARK_INODE_NUMS)) { 837 set_fs_fixup_state(fd, STATE_UPDATING_INUMS); 838 } 839 } 840 841 if (get_fs_fixup_state(fd) == STATE_UPDATING_INUMS) { 842 if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, UPDATE_INODE_NUMS)) { 843 set_fs_fixup_state(fd, STATE_UPDATING_SB); 844 } 845 } 846 847 if (get_fs_fixup_state(fd) == STATE_UPDATING_SB) { 848 /* set the new inodes/blockgruop number, 849 * and sets the state back to 0. 850 */ 851 if (!update_superblocks_and_bg_desc(fd, STATE_UPDATING_SB)) { 852 set_fs_fixup_state(fd, STATE_UNSET); 853 } 854 } 855 856 close(fd); 857 858 return 0; 859} 860