Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 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" |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 19 | #include "allocate.h" |
| 20 | #include "ext4fixup.h" |
| 21 | |
Colin Cross | dc5abee | 2012-04-23 23:20:48 -0700 | [diff] [blame] | 22 | #include <sparse/sparse.h> |
| 23 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 24 | #include <sys/types.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/types.h> |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 27 | #include <fcntl.h> |
| 28 | #include <unistd.h> |
| 29 | |
Raphael Moll | 4605b3f | 2012-02-03 23:02:33 -0800 | [diff] [blame] | 30 | #ifndef USE_MINGW |
| 31 | #include <sys/mman.h> |
| 32 | #endif |
| 33 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 34 | #if defined(__APPLE__) && defined(__MACH__) |
| 35 | #define lseek64 lseek |
| 36 | #define off64_t off_t |
| 37 | #endif |
| 38 | |
| 39 | /* The inode block count for a file/directory is in units of 512 byte blocks, |
| 40 | * _NOT_ the filesystem block size! |
| 41 | */ |
| 42 | #define INODE_BLOCK_SIZE 512 |
| 43 | |
| 44 | #define MAX_EXT4_BLOCK_SIZE 4096 |
| 45 | |
| 46 | /* The two modes the recurse_dir() can be in */ |
| 47 | #define SANITY_CHECK_PASS 1 |
| 48 | #define MARK_INODE_NUMS 2 |
| 49 | #define UPDATE_INODE_NUMS 3 |
| 50 | |
| 51 | /* Magic numbers to indicate what state the update process is in */ |
| 52 | #define MAGIC_STATE_MARKING_INUMS 0x7000151515565512ll |
| 53 | #define MAGIC_STATE_UPDATING_INUMS 0x6121131211735123ll |
| 54 | #define MAGIC_STATE_UPDATING_SB 0x15e1715151558477ll |
| 55 | |
| 56 | /* Internal state variables corresponding to the magic numbers */ |
| 57 | #define STATE_UNSET 0 |
| 58 | #define STATE_MARKING_INUMS 1 |
| 59 | #define STATE_UPDATING_INUMS 2 |
| 60 | #define STATE_UPDATING_SB 3 |
| 61 | |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 62 | /* Used for automated testing of this programs ability to stop and be restarted wthout error */ |
| 63 | static int bail_phase = 0; |
| 64 | static int bail_loc = 0; |
| 65 | static int bail_count = 0; |
| 66 | static int count = 0; |
| 67 | |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 68 | /* global flags */ |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 69 | static int verbose = 0; |
| 70 | static int no_write = 0; |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 71 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 72 | static int new_inodes_per_group = 0; |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 73 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 74 | static int no_write_fixup_state = 0; |
| 75 | |
| 76 | static int compute_new_inum(unsigned int old_inum) |
| 77 | { |
| 78 | unsigned int group, offset; |
| 79 | |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 80 | group = (old_inum - 1) / info.inodes_per_group; |
| 81 | offset = (old_inum -1) % info.inodes_per_group; |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 82 | |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 83 | return (group * new_inodes_per_group) + offset + 1; |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | /* Function to read the primary superblock */ |
| 87 | static void read_sb(int fd, struct ext4_super_block *sb) |
| 88 | { |
| 89 | off64_t ret; |
| 90 | |
| 91 | ret = lseek64(fd, 1024, SEEK_SET); |
| 92 | if (ret < 0) |
| 93 | critical_error_errno("failed to seek to superblock"); |
| 94 | |
| 95 | ret = read(fd, sb, sizeof(*sb)); |
| 96 | if (ret < 0) |
| 97 | critical_error_errno("failed to read superblock"); |
| 98 | if (ret != sizeof(*sb)) |
| 99 | critical_error("failed to read all of superblock"); |
| 100 | } |
| 101 | |
| 102 | /* Function to write a primary or backup superblock at a given offset */ |
| 103 | static void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb) |
| 104 | { |
| 105 | off64_t ret; |
| 106 | |
| 107 | if (no_write) { |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | ret = lseek64(fd, offset, SEEK_SET); |
| 112 | if (ret < 0) |
| 113 | critical_error_errno("failed to seek to superblock"); |
| 114 | |
| 115 | ret = write(fd, sb, sizeof(*sb)); |
| 116 | if (ret < 0) |
| 117 | critical_error_errno("failed to write superblock"); |
| 118 | if (ret != sizeof(*sb)) |
| 119 | critical_error("failed to write all of superblock"); |
| 120 | } |
| 121 | |
| 122 | static int get_fs_fixup_state(int fd) |
| 123 | { |
| 124 | unsigned long long magic; |
| 125 | int ret, len; |
| 126 | |
| 127 | if (no_write) { |
| 128 | return no_write_fixup_state; |
| 129 | } |
| 130 | |
| 131 | lseek64(fd, 0, SEEK_SET); |
| 132 | len = read(fd, &magic, sizeof(magic)); |
| 133 | if (len != sizeof(magic)) { |
| 134 | critical_error("cannot read fixup_state\n"); |
| 135 | } |
| 136 | |
| 137 | switch (magic) { |
| 138 | case MAGIC_STATE_MARKING_INUMS: |
| 139 | ret = STATE_MARKING_INUMS; |
| 140 | break; |
| 141 | case MAGIC_STATE_UPDATING_INUMS: |
| 142 | ret = STATE_UPDATING_INUMS; |
| 143 | break; |
| 144 | case MAGIC_STATE_UPDATING_SB: |
| 145 | ret = STATE_UPDATING_SB; |
| 146 | break; |
| 147 | default: |
| 148 | ret = STATE_UNSET; |
| 149 | } |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | static int set_fs_fixup_state(int fd, int state) |
| 154 | { |
| 155 | unsigned long long magic; |
| 156 | struct ext4_super_block sb; |
| 157 | int len; |
| 158 | |
| 159 | if (no_write) { |
| 160 | no_write_fixup_state = state; |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | switch (state) { |
| 165 | case STATE_MARKING_INUMS: |
| 166 | magic = MAGIC_STATE_MARKING_INUMS; |
| 167 | break; |
| 168 | case STATE_UPDATING_INUMS: |
| 169 | magic = MAGIC_STATE_UPDATING_INUMS; |
| 170 | break; |
| 171 | case STATE_UPDATING_SB: |
| 172 | magic = MAGIC_STATE_UPDATING_SB; |
| 173 | break; |
| 174 | case STATE_UNSET: |
| 175 | default: |
| 176 | magic = 0ll; |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | lseek64(fd, 0, SEEK_SET); |
| 181 | len = write(fd, &magic, sizeof(magic)); |
| 182 | if (len != sizeof(magic)) { |
| 183 | critical_error("cannot write fixup_state\n"); |
| 184 | } |
| 185 | |
| 186 | read_sb(fd, &sb); |
| 187 | if (magic) { |
| 188 | /* If we are in the process of updating the filesystem, make it unmountable */ |
| 189 | sb.s_desc_size |= 1; |
| 190 | } else { |
| 191 | /* we are done, so make the filesystem mountable again */ |
| 192 | sb.s_desc_size &= ~1; |
| 193 | } |
| 194 | write_sb(fd, 1024, &sb); |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static int read_ext(int fd) |
| 200 | { |
| 201 | off64_t ret; |
| 202 | struct ext4_super_block sb; |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 203 | |
| 204 | read_sb(fd, &sb); |
| 205 | |
| 206 | ext4_parse_sb(&sb); |
| 207 | |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 208 | if (info.feat_incompat & EXT4_FEATURE_INCOMPAT_RECOVER) { |
| 209 | critical_error("Filesystem needs recovery first, mount and unmount to do that\n"); |
| 210 | } |
| 211 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 212 | /* Clear the low bit which is set while this tool is in progress. |
| 213 | * If the tool crashes, it will still be set when we restart. |
| 214 | * The low bit is set to make the filesystem unmountable while |
| 215 | * it is being fixed up. Also allow 0, which means the old ext2 |
| 216 | * size is in use. |
| 217 | */ |
| 218 | if (((sb.s_desc_size & ~1) != sizeof(struct ext2_group_desc)) && |
| 219 | ((sb.s_desc_size & ~1) != 0)) |
| 220 | critical_error("error: bg_desc_size != sizeof(struct ext2_group_desc)\n"); |
| 221 | |
| 222 | ret = lseek64(fd, info.len, SEEK_SET); |
| 223 | if (ret < 0) |
| 224 | critical_error_errno("failed to seek to end of input image"); |
| 225 | |
| 226 | ret = lseek64(fd, info.block_size * (aux_info.first_data_block + 1), SEEK_SET); |
| 227 | if (ret < 0) |
| 228 | critical_error_errno("failed to seek to block group descriptors"); |
| 229 | |
| 230 | ret = read(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); |
| 231 | if (ret < 0) |
| 232 | critical_error_errno("failed to read block group descriptors"); |
| 233 | if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) |
| 234 | critical_error("failed to read all of block group descriptors"); |
| 235 | |
| 236 | if (verbose) { |
| 237 | printf("Found filesystem with parameters:\n"); |
| 238 | printf(" Size: %llu\n", info.len); |
| 239 | printf(" Block size: %d\n", info.block_size); |
| 240 | printf(" Blocks per group: %d\n", info.blocks_per_group); |
| 241 | printf(" Inodes per group: %d\n", info.inodes_per_group); |
| 242 | printf(" Inode size: %d\n", info.inode_size); |
| 243 | printf(" Label: %s\n", info.label); |
| 244 | printf(" Blocks: %llu\n", aux_info.len_blocks); |
| 245 | printf(" Block groups: %d\n", aux_info.groups); |
| 246 | printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks); |
| 247 | printf(" Used %d/%d inodes and %d/%d blocks\n", |
| 248 | aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count, |
| 249 | aux_info.sb->s_inodes_count, |
| 250 | aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo, |
| 251 | aux_info.sb->s_blocks_count_lo); |
| 252 | } |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static int read_inode(int fd, unsigned int inum, struct ext4_inode *inode) |
| 258 | { |
| 259 | unsigned int bg_num, bg_offset; |
| 260 | off64_t inode_offset; |
| 261 | int len; |
| 262 | |
| 263 | bg_num = (inum-1) / info.inodes_per_group; |
| 264 | bg_offset = (inum-1) % info.inodes_per_group; |
| 265 | |
| 266 | inode_offset = ((unsigned long long)aux_info.bg_desc[bg_num].bg_inode_table * info.block_size) + |
| 267 | (bg_offset * info.inode_size); |
| 268 | |
| 269 | if (lseek64(fd, inode_offset, SEEK_SET) < 0) { |
| 270 | critical_error_errno("failed to seek to inode %d\n", inum); |
| 271 | } |
| 272 | |
| 273 | len=read(fd, inode, sizeof(*inode)); |
| 274 | if (len != sizeof(*inode)) { |
| 275 | critical_error_errno("failed to read inode %d\n", inum); |
| 276 | } |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static int read_block(int fd, unsigned long long block_num, void *block) |
| 282 | { |
| 283 | off64_t off; |
| 284 | unsigned int len; |
| 285 | |
| 286 | off = block_num * info.block_size; |
| 287 | |
| 288 | if (lseek64(fd, off, SEEK_SET) , 0) { |
| 289 | critical_error_errno("failed to seek to block %lld\n", block_num); |
| 290 | } |
| 291 | |
| 292 | len=read(fd, block, info.block_size); |
| 293 | if (len != info.block_size) { |
| 294 | critical_error_errno("failed to read block %lld\n", block_num); |
| 295 | } |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static int write_block(int fd, unsigned long long block_num, void *block) |
| 301 | { |
| 302 | off64_t off; |
| 303 | unsigned int len; |
| 304 | |
| 305 | if (no_write) { |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | off = block_num * info.block_size; |
| 310 | |
| 311 | if (lseek64(fd, off, SEEK_SET) < 0) { |
| 312 | critical_error_errno("failed to seek to block %lld\n", block_num); |
| 313 | } |
| 314 | |
| 315 | len=write(fd, block, info.block_size); |
| 316 | if (len != info.block_size) { |
| 317 | critical_error_errno("failed to write block %lld\n", block_num); |
| 318 | } |
| 319 | |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static int bitmap_get_bit(u8 *bitmap, u32 bit) |
| 324 | { |
| 325 | if (bitmap[bit / 8] & (1 << (bit % 8))) |
| 326 | return 1; |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static void bitmap_clear_bit(u8 *bitmap, u32 bit) |
| 332 | { |
| 333 | bitmap[bit / 8] &= ~(1 << (bit % 8)); |
| 334 | |
| 335 | return; |
| 336 | } |
| 337 | |
| 338 | static void check_inode_bitmap(int fd, unsigned int bg_num) |
| 339 | { |
| 340 | unsigned int inode_bitmap_block_num; |
| 341 | unsigned char block[MAX_EXT4_BLOCK_SIZE]; |
| 342 | int i, bitmap_updated = 0; |
| 343 | |
| 344 | /* Using the bg_num, aux_info.bg_desc[], info.inodes_per_group and |
| 345 | * new_inodes_per_group, retrieve the inode bitmap, and make sure |
| 346 | * the bits between the old and new size are clear |
| 347 | */ |
| 348 | inode_bitmap_block_num = aux_info.bg_desc[bg_num].bg_inode_bitmap; |
| 349 | |
| 350 | read_block(fd, inode_bitmap_block_num, block); |
| 351 | |
| 352 | for (i = info.inodes_per_group; i < new_inodes_per_group; i++) { |
| 353 | if (bitmap_get_bit(block, i)) { |
| 354 | bitmap_clear_bit(block, i); |
| 355 | bitmap_updated = 1; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | if (bitmap_updated) { |
| 360 | if (verbose) { |
| 361 | printf("Warning: updated inode bitmap for block group %d\n", bg_num); |
| 362 | } |
| 363 | write_block(fd, inode_bitmap_block_num, block); |
| 364 | } |
| 365 | |
| 366 | return; |
| 367 | } |
| 368 | |
| 369 | /* Update the superblock and bgdesc of the specified block group */ |
| 370 | static int update_superblocks_and_bg_desc(int fd, int state) |
| 371 | { |
| 372 | off64_t ret; |
| 373 | struct ext4_super_block sb; |
| 374 | unsigned int num_block_groups, total_new_inodes; |
| 375 | unsigned int i; |
| 376 | |
| 377 | |
| 378 | read_sb(fd, &sb); |
| 379 | |
| 380 | /* Compute how many more inodes are now available */ |
| 381 | num_block_groups = DIV_ROUND_UP(aux_info.len_blocks, info.blocks_per_group); |
| 382 | total_new_inodes = num_block_groups * (new_inodes_per_group - sb.s_inodes_per_group); |
| 383 | |
| 384 | if (verbose) { |
| 385 | printf("created %d additional inodes\n", total_new_inodes); |
| 386 | } |
| 387 | |
| 388 | /* Update the free inodes count in each block group descriptor */ |
| 389 | for (i = 0; i < num_block_groups; i++) { |
| 390 | if (state == STATE_UPDATING_SB) { |
| 391 | aux_info.bg_desc[i].bg_free_inodes_count += (new_inodes_per_group - sb.s_inodes_per_group); |
| 392 | } |
| 393 | check_inode_bitmap(fd, i); |
| 394 | } |
| 395 | |
| 396 | /* First some sanity checks */ |
| 397 | if ((sb.s_inodes_count + total_new_inodes) != (new_inodes_per_group * num_block_groups)) { |
| 398 | critical_error("Failed sanity check on new inode count\n"); |
| 399 | } |
| 400 | if (new_inodes_per_group % (info.block_size/info.inode_size)) { |
| 401 | critical_error("Failed sanity check on new inode per group alignment\n"); |
| 402 | } |
| 403 | |
| 404 | /* Update the free inodes count in the superblock */ |
| 405 | sb.s_inodes_count += total_new_inodes; |
| 406 | sb.s_free_inodes_count += total_new_inodes; |
| 407 | sb.s_inodes_per_group = new_inodes_per_group; |
| 408 | |
| 409 | for (i = 0; i < aux_info.groups; i++) { |
| 410 | if (ext4_bg_has_super_block(i)) { |
| 411 | unsigned int sb_offset; |
| 412 | |
| 413 | if (i == 0) { |
| 414 | /* The first superblock is offset by 1K to leave room for boot sectors */ |
| 415 | sb_offset = 1024; |
| 416 | } else { |
| 417 | sb_offset = 0; |
| 418 | } |
| 419 | |
| 420 | sb.s_block_group_nr = i; |
| 421 | /* Don't write out the backup superblocks with the bit set in the s_desc_size |
| 422 | * which prevents the filesystem from mounting. The bit for the primary |
| 423 | * superblock will be cleared on the final call to set_fs_fixup_state() */ |
| 424 | if (i != 0) { |
| 425 | sb.s_desc_size &= ~1; |
| 426 | } |
| 427 | |
| 428 | write_sb(fd, (unsigned long long)i * info.blocks_per_group * info.block_size + sb_offset, &sb); |
| 429 | |
| 430 | ret = lseek64(fd, ((unsigned long long)i * info.blocks_per_group * info.block_size) + |
| 431 | (info.block_size * (aux_info.first_data_block + 1)), SEEK_SET); |
| 432 | if (ret < 0) |
| 433 | critical_error_errno("failed to seek to block group descriptors"); |
| 434 | |
| 435 | if (!no_write) { |
| 436 | ret = write(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks); |
| 437 | if (ret < 0) |
| 438 | critical_error_errno("failed to write block group descriptors"); |
| 439 | if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks) |
| 440 | critical_error("failed to write all of block group descriptors"); |
| 441 | } |
| 442 | } |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 443 | if ((bail_phase == 4) && ((unsigned int)bail_count == i)) { |
| 444 | critical_error("bailing at phase 4\n"); |
| 445 | } |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | |
| 452 | static int get_direct_blocks(struct ext4_inode *inode, unsigned long long *block_list, |
| 453 | unsigned int *count) |
| 454 | { |
| 455 | unsigned int i = 0; |
| 456 | unsigned int ret = 0; |
| 457 | unsigned int sectors_per_block; |
| 458 | |
| 459 | sectors_per_block = info.block_size / INODE_BLOCK_SIZE; |
| 460 | while ((i < (inode->i_blocks_lo / sectors_per_block)) && (i < EXT4_NDIR_BLOCKS)) { |
| 461 | block_list[i] = inode->i_block[i]; |
| 462 | i++; |
| 463 | } |
| 464 | |
| 465 | *count += i; |
| 466 | |
| 467 | if ((inode->i_blocks_lo / sectors_per_block) > EXT4_NDIR_BLOCKS) { |
| 468 | ret = 1; |
| 469 | } |
| 470 | |
| 471 | return ret; |
| 472 | } |
| 473 | |
| 474 | static int get_indirect_blocks(int fd, struct ext4_inode *inode, |
| 475 | unsigned long long *block_list, unsigned int *count) |
| 476 | { |
| 477 | unsigned int i; |
| 478 | unsigned int *indirect_block; |
| 479 | unsigned int sectors_per_block; |
| 480 | |
| 481 | sectors_per_block = info.block_size / INODE_BLOCK_SIZE; |
| 482 | |
| 483 | indirect_block = (unsigned int *)malloc(info.block_size); |
| 484 | if (indirect_block == 0) { |
| 485 | critical_error("failed to allocate memory for indirect_block\n"); |
| 486 | } |
| 487 | |
| 488 | read_block(fd, inode->i_block[EXT4_NDIR_BLOCKS], indirect_block); |
| 489 | |
| 490 | for(i = 0; i < (inode->i_blocks_lo / sectors_per_block - EXT4_NDIR_BLOCKS); i++) { |
| 491 | block_list[EXT4_NDIR_BLOCKS+i] = indirect_block[i]; |
| 492 | } |
| 493 | |
| 494 | *count += i; |
| 495 | |
| 496 | free(indirect_block); |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static int get_block_list_indirect(int fd, struct ext4_inode *inode, unsigned long long *block_list) |
| 502 | { |
| 503 | unsigned int count=0; |
| 504 | |
| 505 | if (get_direct_blocks(inode, block_list, &count)) { |
| 506 | get_indirect_blocks(fd, inode, block_list, &count); |
| 507 | } |
| 508 | |
| 509 | return count; |
| 510 | } |
| 511 | |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame^] | 512 | static int get_extent_ents(struct ext4_extent_header *ext_hdr, unsigned long long *block_list) |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 513 | { |
| 514 | int i, j; |
| 515 | struct ext4_extent *extent; |
| 516 | off64_t fs_block_num; |
| 517 | |
| 518 | if (ext_hdr->eh_depth != 0) { |
| 519 | critical_error("get_extent_ents called with eh_depth != 0\n"); |
| 520 | } |
| 521 | |
| 522 | /* The extent entries immediately follow the header, so add 1 to the pointer |
| 523 | * and cast it to an extent pointer. |
| 524 | */ |
| 525 | extent = (struct ext4_extent *)(ext_hdr + 1); |
| 526 | |
| 527 | for (i = 0; i < ext_hdr->eh_entries; i++) { |
| 528 | fs_block_num = ((off64_t)extent->ee_start_hi << 32) | extent->ee_start_lo; |
| 529 | for (j = 0; j < extent->ee_len; j++) { |
| 530 | block_list[extent->ee_block+j] = fs_block_num+j; |
| 531 | } |
| 532 | extent++; |
| 533 | } |
| 534 | |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | static int get_extent_idx(int fd, struct ext4_extent_header *ext_hdr, unsigned long long *block_list) |
| 539 | { |
| 540 | int i; |
| 541 | struct ext4_extent_idx *extent_idx; |
| 542 | struct ext4_extent_header *tmp_ext_hdr; |
| 543 | off64_t fs_block_num; |
| 544 | unsigned char block[MAX_EXT4_BLOCK_SIZE]; |
| 545 | |
| 546 | /* Sanity check */ |
| 547 | if (ext_hdr->eh_depth == 0) { |
| 548 | critical_error("get_extent_idx called with eh_depth == 0\n"); |
| 549 | } |
| 550 | |
| 551 | /* The extent entries immediately follow the header, so add 1 to the pointer |
| 552 | * and cast it to an extent pointer. |
| 553 | */ |
| 554 | extent_idx = (struct ext4_extent_idx *)(ext_hdr + 1); |
| 555 | |
| 556 | for (i = 0; i < ext_hdr->eh_entries; i++) { |
| 557 | fs_block_num = ((off64_t)extent_idx->ei_leaf_hi << 32) | extent_idx->ei_leaf_lo; |
| 558 | read_block(fd, fs_block_num, block); |
| 559 | tmp_ext_hdr = (struct ext4_extent_header *)block; |
| 560 | |
| 561 | if (tmp_ext_hdr->eh_depth == 0) { |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame^] | 562 | get_extent_ents(tmp_ext_hdr, block_list); /* leaf node, fill in block_list */ |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 563 | } else { |
| 564 | get_extent_idx(fd, tmp_ext_hdr, block_list); /* recurse down the tree */ |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static int get_block_list_extents(int fd, struct ext4_inode *inode, unsigned long long *block_list) |
| 572 | { |
| 573 | struct ext4_extent_header *extent_hdr; |
| 574 | |
| 575 | extent_hdr = (struct ext4_extent_header *)inode->i_block; |
| 576 | |
| 577 | if (extent_hdr->eh_magic != EXT4_EXT_MAGIC) { |
| 578 | critical_error("extent header has unexpected magic value 0x%4.4x\n", |
| 579 | extent_hdr->eh_magic); |
| 580 | } |
| 581 | |
| 582 | if (extent_hdr->eh_depth == 0) { |
Nick Kralevich | 5446bde | 2013-02-19 19:05:47 -0800 | [diff] [blame^] | 583 | get_extent_ents((struct ext4_extent_header *)inode->i_block, block_list); |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | get_extent_idx(fd, (struct ext4_extent_header *)inode->i_block, block_list); |
| 588 | |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | static int is_entry_dir(int fd, struct ext4_dir_entry_2 *dirp, int pass) |
| 593 | { |
| 594 | struct ext4_inode inode; |
| 595 | int ret = 0; |
| 596 | |
| 597 | if (dirp->file_type == EXT4_FT_DIR) { |
| 598 | ret = 1; |
| 599 | } else if (dirp->file_type == EXT4_FT_UNKNOWN) { |
| 600 | /* Somebody was too lazy to fill in the dir entry, |
| 601 | * so we have to go fetch it from the inode. Grrr. |
| 602 | */ |
| 603 | /* if UPDATE_INODE_NUMS pass and the inode high bit is not |
| 604 | * set return false so we don't recurse down the tree that is |
| 605 | * already updated. Otherwise, fetch inode, and return answer. |
| 606 | */ |
| 607 | if ((pass == UPDATE_INODE_NUMS) && !(dirp->inode & 0x80000000)) { |
| 608 | ret = 0; |
| 609 | } else { |
| 610 | read_inode(fd, (dirp->inode & 0x7fffffff), &inode); |
| 611 | if (S_ISDIR(inode.i_mode)) { |
| 612 | ret = 1; |
| 613 | } |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | return ret; |
| 618 | } |
| 619 | |
| 620 | static int recurse_dir(int fd, struct ext4_inode *inode, char *dirbuf, int dirsize, int mode) |
| 621 | { |
| 622 | unsigned long long *block_list; |
| 623 | unsigned int num_blocks; |
| 624 | struct ext4_dir_entry_2 *dirp, *prev_dirp = 0; |
| 625 | char name[256]; |
| 626 | unsigned int i, leftover_space, is_dir; |
| 627 | struct ext4_inode tmp_inode; |
| 628 | int tmp_dirsize; |
| 629 | char *tmp_dirbuf; |
| 630 | |
| 631 | switch (mode) { |
| 632 | case SANITY_CHECK_PASS: |
| 633 | case MARK_INODE_NUMS: |
| 634 | case UPDATE_INODE_NUMS: |
| 635 | break; |
| 636 | default: |
| 637 | critical_error("recurse_dir() called witn unknown mode!\n"); |
| 638 | } |
| 639 | |
| 640 | if (dirsize % info.block_size) { |
| 641 | critical_error("dirsize %d not a multiple of block_size %d. This is unexpected!\n", |
| 642 | dirsize, info.block_size); |
| 643 | } |
| 644 | |
| 645 | num_blocks = dirsize / info.block_size; |
| 646 | |
| 647 | block_list = malloc((num_blocks + 1) * sizeof(*block_list)); |
| 648 | if (block_list == 0) { |
| 649 | critical_error("failed to allocate memory for block_list\n"); |
| 650 | } |
| 651 | |
| 652 | if (inode->i_flags & EXT4_EXTENTS_FL) { |
| 653 | get_block_list_extents(fd, inode, block_list); |
| 654 | } else { |
| 655 | /* A directory that requires doubly or triply indirect blocks in huge indeed, |
| 656 | * and will almost certainly not exist, especially since make_ext4fs only creates |
| 657 | * directories with extents, and the kernel will too, but check to make sure the |
| 658 | * directory is not that big and give an error if so. Our limit is 12 direct blocks, |
| 659 | * plus block_size/4 singly indirect blocks, which for a filesystem with 4K blocks |
| 660 | * is a directory 1036 blocks long, or 4,243,456 bytes long! Assuming an average |
| 661 | * filename length of 20 (which I think is generous) thats 20 + 8 bytes overhead |
| 662 | * per entry, or 151,552 entries in the directory! |
| 663 | */ |
| 664 | if (num_blocks > (info.block_size / 4 + EXT4_NDIR_BLOCKS)) { |
| 665 | critical_error("Non-extent based directory is too big!\n"); |
| 666 | } |
| 667 | get_block_list_indirect(fd, inode, block_list); |
| 668 | } |
| 669 | |
| 670 | /* Read in all the blocks for this directory */ |
| 671 | for (i = 0; i < num_blocks; i++) { |
| 672 | read_block(fd, block_list[i], dirbuf + (i * info.block_size)); |
| 673 | } |
| 674 | |
| 675 | dirp = (struct ext4_dir_entry_2 *)dirbuf; |
| 676 | while (dirp < (struct ext4_dir_entry_2 *)(dirbuf + dirsize)) { |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 677 | count++; |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 678 | leftover_space = (char *)(dirbuf + dirsize) - (char *)dirp; |
| 679 | if (((mode == SANITY_CHECK_PASS) || (mode == UPDATE_INODE_NUMS)) && |
| 680 | (leftover_space <= 8) && prev_dirp) { |
| 681 | /* This is a bug in an older version of make_ext4fs, where it |
| 682 | * didn't properly include the rest of the block in rec_len. |
| 683 | * Update rec_len on the previous entry to include the rest of |
| 684 | * the block and exit the loop. |
| 685 | */ |
| 686 | if (verbose) { |
| 687 | printf("fixing up short rec_len for diretory entry for %s\n", name); |
| 688 | } |
| 689 | prev_dirp->rec_len += leftover_space; |
| 690 | break; |
| 691 | } |
| 692 | |
| 693 | if (dirp->inode == 0) { |
| 694 | /* This is the last entry in the directory */ |
| 695 | break; |
| 696 | } |
| 697 | |
| 698 | strncpy(name, dirp->name, dirp->name_len); |
| 699 | name[dirp->name_len]='\0'; |
| 700 | |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 701 | /* Only recurse on pass UPDATE_INODE_NUMS if the high bit is set. |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 702 | * Otherwise, this inode entry has already been updated |
| 703 | * and we'll do the wrong thing. Also don't recurse on . or .., |
| 704 | * and certainly not on non-directories! |
| 705 | */ |
| 706 | /* Hrm, looks like filesystems made by fastboot on stingray set the file_type |
| 707 | * flag, but the lost+found directory has the type set to Unknown, which |
| 708 | * seems to imply I need to read the inode and get it. |
| 709 | */ |
| 710 | is_dir = is_entry_dir(fd, dirp, mode); |
| 711 | if ( is_dir && (strcmp(name, ".") && strcmp(name, "..")) && |
| 712 | ((mode == SANITY_CHECK_PASS) || (mode == MARK_INODE_NUMS) || |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 713 | ((mode == UPDATE_INODE_NUMS) && (dirp->inode & 0x80000000))) ) { |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 714 | /* A directory! Recurse! */ |
| 715 | read_inode(fd, dirp->inode & 0x7fffffff, &tmp_inode); |
| 716 | |
| 717 | if (!S_ISDIR(tmp_inode.i_mode)) { |
| 718 | critical_error("inode %d for name %s does not point to a directory\n", |
| 719 | dirp->inode & 0x7fffffff, name); |
| 720 | } |
| 721 | if (verbose) { |
| 722 | printf("inode %d %s use extents\n", dirp->inode & 0x7fffffff, |
| 723 | (tmp_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); |
| 724 | } |
| 725 | |
| 726 | tmp_dirsize = tmp_inode.i_blocks_lo * INODE_BLOCK_SIZE; |
| 727 | if (verbose) { |
| 728 | printf("dir size = %d bytes\n", tmp_dirsize); |
| 729 | } |
| 730 | |
| 731 | tmp_dirbuf = malloc(tmp_dirsize); |
| 732 | if (tmp_dirbuf == 0) { |
| 733 | critical_error("failed to allocate memory for tmp_dirbuf\n"); |
| 734 | } |
| 735 | |
| 736 | recurse_dir(fd, &tmp_inode, tmp_dirbuf, tmp_dirsize, mode); |
| 737 | |
| 738 | free(tmp_dirbuf); |
| 739 | } |
| 740 | |
| 741 | if (verbose) { |
| 742 | if (is_dir) { |
| 743 | printf("Directory %s\n", name); |
| 744 | } else { |
| 745 | printf("Non-directory %s\n", name); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | /* Process entry based on current mode. Either set high bit or change inode number */ |
| 750 | if (mode == MARK_INODE_NUMS) { |
| 751 | dirp->inode |= 0x80000000; |
| 752 | } else if (mode == UPDATE_INODE_NUMS) { |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 753 | if (dirp->inode & 0x80000000) { |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 754 | dirp->inode = compute_new_inum(dirp->inode & 0x7fffffff); |
| 755 | } |
| 756 | } |
| 757 | |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 758 | if ((bail_phase == mode) && (bail_loc == 1) && (bail_count == count)) { |
| 759 | critical_error("Bailing at phase %d, loc 1 and count %d\n", mode, count); |
| 760 | } |
| 761 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 762 | /* Point dirp at the next entry */ |
| 763 | prev_dirp = dirp; |
| 764 | dirp = (struct ext4_dir_entry_2*)((char *)dirp + dirp->rec_len); |
| 765 | } |
| 766 | |
| 767 | /* Write out all the blocks for this directory */ |
| 768 | for (i = 0; i < num_blocks; i++) { |
| 769 | write_block(fd, block_list[i], dirbuf + (i * info.block_size)); |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 770 | if ((bail_phase == mode) && (bail_loc == 2) && (bail_count <= count)) { |
| 771 | critical_error("Bailing at phase %d, loc 2 and count %d\n", mode, count); |
| 772 | } |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 773 | } |
| 774 | |
| 775 | free(block_list); |
| 776 | |
| 777 | return 0; |
| 778 | } |
| 779 | |
| 780 | int ext4fixup(char *fsdev) |
| 781 | { |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 782 | return ext4fixup_internal(fsdev, 0, 0, 0, 0, 0); |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 783 | } |
| 784 | |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 785 | int ext4fixup_internal(char *fsdev, int v_flag, int n_flag, |
| 786 | int stop_phase, int stop_loc, int stop_count) |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 787 | { |
| 788 | int fd; |
| 789 | struct ext4_inode root_inode; |
| 790 | unsigned int dirsize; |
| 791 | char *dirbuf; |
| 792 | |
| 793 | if (setjmp(setjmp_env)) |
| 794 | return EXIT_FAILURE; /* Handle a call to longjmp() */ |
| 795 | |
| 796 | verbose = v_flag; |
| 797 | no_write = n_flag; |
| 798 | |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 799 | bail_phase = stop_phase; |
| 800 | bail_loc = stop_loc; |
| 801 | bail_count = stop_count; |
| 802 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 803 | fd = open(fsdev, O_RDWR); |
| 804 | |
| 805 | if (fd < 0) |
| 806 | critical_error_errno("failed to open filesystem image"); |
| 807 | |
| 808 | read_ext(fd); |
| 809 | |
| 810 | if ((info.feat_incompat & EXT4_FEATURE_INCOMPAT_FILETYPE) == 0) { |
| 811 | critical_error("Expected filesystem to have filetype flag set\n"); |
| 812 | } |
| 813 | |
| 814 | #if 0 // If we have to fix the directory rec_len issue, we can't use this check |
| 815 | /* Check to see if the inodes/group is copacetic */ |
| 816 | if (info.inodes_per_blockgroup % (info.block_size/info.inode_size) == 0) { |
| 817 | /* This filesystem has either already been updated, or was |
| 818 | * made correctly. |
| 819 | */ |
| 820 | if (verbose) { |
| 821 | printf("%s: filesystem correct, no work to do\n", me); |
| 822 | } |
| 823 | exit(0); |
| 824 | } |
| 825 | #endif |
| 826 | |
| 827 | /* Compute what the new value of inodes_per_blockgroup will be when we're done */ |
| 828 | new_inodes_per_group=ALIGN(info.inodes_per_group,(info.block_size/info.inode_size)); |
| 829 | |
| 830 | read_inode(fd, EXT4_ROOT_INO, &root_inode); |
| 831 | |
| 832 | if (!S_ISDIR(root_inode.i_mode)) { |
| 833 | critical_error("root inode %d does not point to a directory\n", EXT4_ROOT_INO); |
| 834 | } |
| 835 | if (verbose) { |
| 836 | printf("inode %d %s use extents\n", EXT4_ROOT_INO, |
| 837 | (root_inode.i_flags & EXT4_EXTENTS_FL) ? "does" : "does not"); |
| 838 | } |
| 839 | |
| 840 | dirsize = root_inode.i_blocks_lo * INODE_BLOCK_SIZE; |
| 841 | if (verbose) { |
| 842 | printf("root dir size = %d bytes\n", dirsize); |
| 843 | } |
| 844 | |
| 845 | dirbuf = malloc(dirsize); |
| 846 | if (dirbuf == 0) { |
| 847 | critical_error("failed to allocate memory for dirbuf\n"); |
| 848 | } |
| 849 | |
| 850 | /* Perform a sanity check pass first, try to catch any errors that will occur |
| 851 | * before we actually change anything, so we don't leave a filesystem in a |
| 852 | * corrupted, unrecoverable state. Set no_write, make it quiet, and do a recurse |
| 853 | * pass and a update_superblock pass. Set flags back to requested state when done. |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 854 | * Only perform sanity check if the state is unset. If the state is _NOT_ unset, |
| 855 | * then the tool has already been run and interrupted, and it presumably ran and |
| 856 | * passed sanity checked before it got interrupted. It is _NOT_ safe to run sanity |
| 857 | * check if state is unset because it assumes inodes are to be computed using the |
| 858 | * old inodes/group, but some inode numbers may be updated to the new number. |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 859 | */ |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 860 | if (get_fs_fixup_state(fd) == STATE_UNSET) { |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 861 | verbose = 0; |
| 862 | no_write = 1; |
| 863 | recurse_dir(fd, &root_inode, dirbuf, dirsize, SANITY_CHECK_PASS); |
| 864 | update_superblocks_and_bg_desc(fd, STATE_UNSET); |
| 865 | verbose = v_flag; |
| 866 | no_write = n_flag; |
| 867 | |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 868 | set_fs_fixup_state(fd, STATE_MARKING_INUMS); |
| 869 | } |
| 870 | |
| 871 | if (get_fs_fixup_state(fd) == STATE_MARKING_INUMS) { |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 872 | count = 0; /* Reset debugging counter */ |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 873 | if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, MARK_INODE_NUMS)) { |
| 874 | set_fs_fixup_state(fd, STATE_UPDATING_INUMS); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | if (get_fs_fixup_state(fd) == STATE_UPDATING_INUMS) { |
Ken Sumrall | 7e5ff13 | 2011-06-22 18:34:28 -0700 | [diff] [blame] | 879 | count = 0; /* Reset debugging counter */ |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 880 | if (!recurse_dir(fd, &root_inode, dirbuf, dirsize, UPDATE_INODE_NUMS)) { |
| 881 | set_fs_fixup_state(fd, STATE_UPDATING_SB); |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | if (get_fs_fixup_state(fd) == STATE_UPDATING_SB) { |
Ken Sumrall | 97fc910 | 2011-06-22 16:50:24 -0700 | [diff] [blame] | 886 | /* set the new inodes/blockgroup number, |
Ken Sumrall | 671cd21 | 2011-06-09 21:24:42 -0700 | [diff] [blame] | 887 | * and sets the state back to 0. |
| 888 | */ |
| 889 | if (!update_superblocks_and_bg_desc(fd, STATE_UPDATING_SB)) { |
| 890 | set_fs_fixup_state(fd, STATE_UNSET); |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | close(fd); |
| 895 | |
| 896 | return 0; |
| 897 | } |