make_ext4fs.c

   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
  17 #include "make_ext4fs.h"
  18 #include "ext4_utils.h"
  19 #include "allocate.h"
  20 #include "contents.h"
  21 #include "uuid.h"
  22 #include "wipe.h"
  23
  24 #include <sparse/sparse.h>
  25
  26 #include <assert.h>
  27 #include <dirent.h>
  28 #include <fcntl.h>
  29 #include <inttypes.h>
  30 #include <libgen.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <sys/stat.h>
  36 #include <sys/types.h>
  37
  38 #ifdef USE_MINGW
  39
  40 #include <winsock2.h>
  41
  42 /* These match the Linux definitions of these flags.
  43    L_xx is defined to avoid conflicting with the win32 versions.
  44 */
  45 #define L_S_IRUSR 00400
  46 #define L_S_IWUSR 00200
  47 #define L_S_IXUSR 00100
  48 #define S_IRWXU (L_S_IRUSR | L_S_IWUSR | L_S_IXUSR)
  49 #define S_IRGRP 00040
  50 #define S_IWGRP 00020
  51 #define S_IXGRP 00010
  52 #define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP)
  53 #define S_IROTH 00004
  54 #define S_IWOTH 00002
  55 #define S_IXOTH 00001
  56 #define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH)
  57 #define S_ISUID 0004000
  58 #define S_ISGID 0002000
  59 #define S_ISVTX 0001000
  60
  61 #else
  62
  63 #include <selinux/selinux.h>
  64 #include <selinux/label.h>
  65 #include <selinux/android.h>
  66
  67 #define O_BINARY 0
  68
  69 #endif
  70
  71 /* TODO: Not implemented:
  72    Allocating blocks in the same block group as the file inode
  73    Hash or binary tree directories
  74    Special files: sockets, devices, fifos
  75  */
  76
  77 static int filter_dot(const struct dirent *d)
  78 {
  79         return (strcmp(d->d_name, "..") && strcmp(d->d_name, "."));
  80 }
  81
  82 static u32 build_default_directory_structure(const char *dir_path,
  83                                              struct selabel_handle *sehnd)
  84 {
  85         u32 inode;
  86         u32 root_inode;
  87         struct dentry dentries = {
  88                         .filename = "lost+found",
  89                         .file_type = EXT4_FT_DIR,
  90                         .mode = S_IRWXU,
  91                         .uid = 0,
  92                         .gid = 0,
  93                         .mtime = 0,
  94         };
  95         root_inode = make_directory(0, 1, &dentries, 1);
  96         inode = make_directory(root_inode, 0, NULL, 0);
  97         *dentries.inode = inode;
  98         inode_set_permissions(inode, dentries.mode,
  99                 dentries.uid, dentries.gid, dentries.mtime);
 100
 101 #ifndef USE_MINGW
 102         if (sehnd) {
 103                 char *path = NULL;
 104                 char *secontext = NULL;
 105
 106                 asprintf(&path, "%slost+found", dir_path);
 107                 if (selabel_lookup(sehnd, &secontext, path, S_IFDIR) < 0) {
 108                         error("cannot lookup security context for %s", path);
 109                 } else {
 110                         inode_set_selinux(inode, secontext);
 111                         freecon(secontext);
 112                 }
 113                 free(path);
 114         }
 115 #endif
 116
 117         return root_inode;
 118 }
 119
 120 #ifndef USE_MINGW
 121 /* Read a local directory and create the same tree in the generated filesystem.
 122    Calls itself recursively with each directory in the given directory.
 123    full_path is an absolute or relative path, with a trailing slash, to the
 124    directory on disk that should be copied, or NULL if this is a directory
 125    that does not exist on disk (e.g. lost+found).
 126    dir_path is an absolute path, with trailing slash, to the same directory
 127    if the image were mounted at the specified mount point */
 128 static u32 build_directory_structure(const char *full_path, const char *dir_path,
 129                 u32 dir_inode, fs_config_func_t fs_config_func,
 130                 struct selabel_handle *sehnd, int verbose, time_t fixed_time)
 131 {
 132         int entries = 0;
 133         struct dentry *dentries;
 134         struct dirent **namelist = NULL;
 135         struct stat stat;
 136         int ret;
 137         int i;
 138         u32 inode;
 139         u32 entry_inode;
 140         u32 dirs = 0;
 141         bool needs_lost_and_found = false;
 142
 143         if (full_path) {
 144                 entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort);
 145                 if (entries < 0) {
 146 #ifdef __GLIBC__
 147                         /* The scandir function implemented in glibc has a bug that makes it
 148                            erroneously fail with ENOMEM under certain circumstances.
 149                            As a workaround we can retry the scandir call with the same arguments.
 150                            GLIBC BZ: https://sourceware.org/bugzilla/show_bug.cgi?id=17804 */
 151                         if (errno == ENOMEM)
 152                                 entries = scandir(full_path, &namelist, filter_dot, (void*)alphasort);
 153 #endif
 154                         if (entries < 0) {
 155                                 error_errno("scandir");
 156                                 return EXT4_ALLOCATE_FAILED;
 157                         }
 158                 }
 159         }
 160
 161         if (dir_inode == 0) {
 162                 /* root directory, check if lost+found already exists */
 163                 for (i = 0; i < entries; i++)
 164                         if (strcmp(namelist[i]->d_name, "lost+found") == 0)
 165                                 break;
 166                 if (i == entries)
 167                         needs_lost_and_found = true;
 168         }
 169
 170         dentries = calloc(entries, sizeof(struct dentry));
 171         if (dentries == NULL)
 172                 critical_error_errno("malloc");
 173
 174         for (i = 0; i < entries; i++) {
 175                 dentries[i].filename = strdup(namelist[i]->d_name);
 176                 if (dentries[i].filename == NULL)
 177                         critical_error_errno("strdup");
 178
 179                 asprintf(&dentries[i].path, "%s%s", dir_path, namelist[i]->d_name);
 180                 asprintf(&dentries[i].full_path, "%s%s", full_path, namelist[i]->d_name);
 181
 182                 free(namelist[i]);
 183
 184                 ret = lstat(dentries[i].full_path, &stat);
 185                 if (ret < 0) {
 186                         error_errno("lstat");
 187                         i--;
 188                         entries--;
 189                         continue;
 190                 }
 191
 192                 dentries[i].size = stat.st_size;
 193                 dentries[i].mode = stat.st_mode & (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO);
 194                 if (fixed_time == -1) {
 195                         dentries[i].mtime = stat.st_mtime;
 196                 } else {
 197                         dentries[i].mtime = fixed_time;
 198                 }
 199                 uint64_t capabilities;
 200                 if (fs_config_func != NULL) {
 201 #ifdef ANDROID
 202                         unsigned int mode = 0;
 203                         unsigned int uid = 0;
 204                         unsigned int gid = 0;
 205                         int dir = S_ISDIR(stat.st_mode);
 206                         fs_config_func(dentries[i].path, dir, &uid, &gid, &mode, &capabilities);
 207                         dentries[i].mode = mode;
 208                         dentries[i].uid = uid;
 209                         dentries[i].gid = gid;
 210                         dentries[i].capabilities = capabilities;
 211 #else
 212                         error("can't set android permissions - built without android support");
 213 #endif
 214                 }
 215 #ifndef USE_MINGW
 216                 if (sehnd) {
 217                         if (selabel_lookup(sehnd, &dentries[i].secon, dentries[i].path, stat.st_mode) < 0) {
 218                                 error("cannot lookup security context for %s", dentries[i].path);
 219                         }
 220
 221                         if (dentries[i].secon && verbose)
 222                                 printf("Labeling %s as %s\n", dentries[i].path, dentries[i].secon);
 223                 }
 224 #endif
 225
 226                 if (S_ISREG(stat.st_mode)) {
 227                         dentries[i].file_type = EXT4_FT_REG_FILE;
 228                 } else if (S_ISDIR(stat.st_mode)) {
 229                         dentries[i].file_type = EXT4_FT_DIR;
 230                         dirs++;
 231                 } else if (S_ISCHR(stat.st_mode)) {
 232                         dentries[i].file_type = EXT4_FT_CHRDEV;
 233                 } else if (S_ISBLK(stat.st_mode)) {
 234                         dentries[i].file_type = EXT4_FT_BLKDEV;
 235                 } else if (S_ISFIFO(stat.st_mode)) {
 236                         dentries[i].file_type = EXT4_FT_FIFO;
 237                 } else if (S_ISSOCK(stat.st_mode)) {
 238                         dentries[i].file_type = EXT4_FT_SOCK;
 239                 } else if (S_ISLNK(stat.st_mode)) {
 240                         dentries[i].file_type = EXT4_FT_SYMLINK;
 241                         dentries[i].link = calloc(info.block_size, 1);
 242                         readlink(dentries[i].full_path, dentries[i].link, info.block_size - 1);
 243                 } else {
 244                         error("unknown file type on %s", dentries[i].path);
 245                         i--;
 246                         entries--;
 247                 }
 248         }
 249         free(namelist);
 250
 251         if (needs_lost_and_found) {
 252                 /* insert a lost+found directory at the beginning of the dentries */
 253                 struct dentry *tmp = calloc(entries + 1, sizeof(struct dentry));
 254                 memset(tmp, 0, sizeof(struct dentry));
 255                 memcpy(tmp + 1, dentries, entries * sizeof(struct dentry));
 256                 dentries = tmp;
 257
 258                 dentries[0].filename = strdup("lost+found");
 259                 asprintf(&dentries[0].path, "%slost+found", dir_path);
 260                 dentries[0].full_path = NULL;
 261                 dentries[0].size = 0;
 262                 dentries[0].mode = S_IRWXU;
 263                 dentries[0].file_type = EXT4_FT_DIR;
 264                 dentries[0].uid = 0;
 265                 dentries[0].gid = 0;
 266                 if (sehnd) {
 267                         if (selabel_lookup(sehnd, &dentries[0].secon, dentries[0].path, dentries[0].mode) < 0)
 268                                 error("cannot lookup security context for %s", dentries[0].path);
 269                 }
 270                 entries++;
 271                 dirs++;
 272         }
 273
 274         inode = make_directory(dir_inode, entries, dentries, dirs);
 275
 276         for (i = 0; i < entries; i++) {
 277                 if (dentries[i].file_type == EXT4_FT_REG_FILE) {
 278                         entry_inode = make_file(dentries[i].full_path, dentries[i].size);
 279                 } else if (dentries[i].file_type == EXT4_FT_DIR) {
 280                         char *subdir_full_path = NULL;
 281                         char *subdir_dir_path;
 282                         if (dentries[i].full_path) {
 283                                 ret = asprintf(&subdir_full_path, "%s/", dentries[i].full_path);
 284                                 if (ret < 0)
 285                                         critical_error_errno("asprintf");
 286                         }
 287                         ret = asprintf(&subdir_dir_path, "%s/", dentries[i].path);
 288                         if (ret < 0)
 289                                 critical_error_errno("asprintf");
 290                         entry_inode = build_directory_structure(subdir_full_path,
 291                                         subdir_dir_path, inode, fs_config_func, sehnd, verbose, fixed_time);
 292                         free(subdir_full_path);
 293                         free(subdir_dir_path);
 294                 } else if (dentries[i].file_type == EXT4_FT_SYMLINK) {
 295                         entry_inode = make_link(dentries[i].link);
 296                 } else {
 297                         error("unknown file type on %s", dentries[i].path);
 298                         entry_inode = 0;
 299                 }
 300                 *dentries[i].inode = entry_inode;
 301
 302                 ret = inode_set_permissions(entry_inode, dentries[i].mode,
 303                         dentries[i].uid, dentries[i].gid,
 304                         dentries[i].mtime);
 305                 if (ret)
 306                         error("failed to set permissions on %s\n", dentries[i].path);
 307
 308                 /*
 309                  * It's important to call inode_set_selinux() before
 310                  * inode_set_capabilities(). Extended attributes need to
 311                  * be stored sorted order, and we guarantee this by making
 312                  * the calls in the proper order.
 313                  * Please see xattr_assert_sane() in contents.c
 314                  */
 315                 ret = inode_set_selinux(entry_inode, dentries[i].secon);
 316                 if (ret)
 317                         error("failed to set SELinux context on %s\n", dentries[i].path);
 318                 ret = inode_set_capabilities(entry_inode, dentries[i].capabilities);
 319                 if (ret)
 320                         error("failed to set capability on %s\n", dentries[i].path);
 321
 322                 free(dentries[i].path);
 323                 free(dentries[i].full_path);
 324                 free(dentries[i].link);
 325                 free((void *)dentries[i].filename);
 326                 free(dentries[i].secon);
 327         }
 328
 329         free(dentries);
 330         return inode;
 331 }
 332 #endif
 333
 334 static u32 compute_block_size()
 335 {
 336         return 4096;
 337 }
 338
 339 static u32 compute_journal_blocks()
 340 {
 341         u32 journal_blocks = DIV_ROUND_UP(info.len, info.block_size) / 64;
 342         if (journal_blocks < 1024)
 343                 journal_blocks = 1024;
 344         if (journal_blocks > 32768)
 345                 journal_blocks = 32768;
 346         return journal_blocks;
 347 }
 348
 349 static u32 compute_blocks_per_group()
 350 {
 351         return info.block_size * 8;
 352 }
 353
 354 static u32 compute_inodes()
 355 {
 356         return DIV_ROUND_UP(info.len, info.block_size) / 4;
 357 }
 358
 359 static u32 compute_inodes_per_group()
 360 {
 361         u32 blocks = DIV_ROUND_UP(info.len, info.block_size);
 362         u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group);
 363         u32 inodes = DIV_ROUND_UP(info.inodes, block_groups);
 364         inodes = EXT4_ALIGN(inodes, (info.block_size / info.inode_size));
 365
 366         /* After properly rounding up the number of inodes/group,
 367          * make sure to update the total inodes field in the info struct.
 368          */
 369         info.inodes = inodes * block_groups;
 370
 371         return inodes;
 372 }
 373
 374 static u32 compute_bg_desc_reserve_blocks()
 375 {
 376         u32 blocks = DIV_ROUND_UP(info.len, info.block_size);
 377         u32 block_groups = DIV_ROUND_UP(blocks, info.blocks_per_group);
 378         u32 bg_desc_blocks = DIV_ROUND_UP(block_groups * sizeof(struct ext2_group_desc),
 379                         info.block_size);
 380
 381         u32 bg_desc_reserve_blocks =
 382                         DIV_ROUND_UP(block_groups * 1024 * sizeof(struct ext2_group_desc),
 383                                         info.block_size) - bg_desc_blocks;
 384
 385         if (bg_desc_reserve_blocks > info.block_size / sizeof(u32))
 386                 bg_desc_reserve_blocks = info.block_size / sizeof(u32);
 387
 388         return bg_desc_reserve_blocks;
 389 }
 390
 391 void reset_ext4fs_info() {
 392         // Reset all the global data structures used by make_ext4fs so it
 393         // can be called again.
 394         memset(&info, 0, sizeof(info));
 395         memset(&aux_info, 0, sizeof(aux_info));
 396
 397         if (ext4_sparse_file) {
 398                 sparse_file_destroy(ext4_sparse_file);
 399                 ext4_sparse_file = NULL;
 400         }
 401 }
 402
 403 int make_ext4fs_sparse_fd(int fd, long long len,
 404                                 const char *mountpoint, struct selabel_handle *sehnd)
 405 {
 406         reset_ext4fs_info();
 407         info.len = len;
 408
 409         return make_ext4fs_internal(fd, NULL, mountpoint, NULL, 0, 1, 0, 0, sehnd, 0, -1, NULL);
 410 }
 411
 412 int make_ext4fs(const char *filename, long long len,
 413                                 const char *mountpoint, struct selabel_handle *sehnd)
 414 {
 415         int fd;
 416         int status;
 417
 418         reset_ext4fs_info();
 419         info.len = len;
 420
 421         fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
 422         if (fd < 0) {
 423                 error_errno("open");
 424                 return EXIT_FAILURE;
 425         }
 426
 427         status = make_ext4fs_internal(fd, NULL, mountpoint, NULL, 0, 0, 0, 1, sehnd, 0, -1, NULL);
 428         close(fd);
 429
 430         return status;
 431 }
 432
 433 /* return a newly-malloc'd string that is a copy of str.  The new string
 434    is guaranteed to have a trailing slash.  If absolute is true, the new string
 435    is also guaranteed to have a leading slash.
 436 */
 437 static char *canonicalize_slashes(const char *str, bool absolute)
 438 {
 439         char *ret;
 440         int len = strlen(str);
 441         int newlen = len;
 442         char *ptr;
 443
 444         if (len == 0) {
 445                 if (absolute)
 446                         return strdup("/");
 447                 else
 448                         return strdup("");
 449         }
 450
 451         if (str[0] != '/' && absolute) {
 452                 newlen++;
 453         }
 454         if (str[len - 1] != '/') {
 455                 newlen++;
 456         }
 457         ret = malloc(newlen + 1);
 458         if (!ret) {
 459                 critical_error("malloc");
 460         }
 461
 462         ptr = ret;
 463         if (str[0] != '/' && absolute) {
 464                 *ptr++ = '/';
 465         }
 466
 467         strcpy(ptr, str);
 468         ptr += len;
 469
 470         if (str[len - 1] != '/') {
 471                 *ptr++ = '/';
 472         }
 473
 474         if (ptr != ret + newlen) {
 475                 critical_error("assertion failed\n");
 476         }
 477
 478         *ptr = '\0';
 479
 480         return ret;
 481 }
 482
 483 static char *canonicalize_abs_slashes(const char *str)
 484 {
 485         return canonicalize_slashes(str, true);
 486 }
 487
 488 static char *canonicalize_rel_slashes(const char *str)
 489 {
 490         return canonicalize_slashes(str, false);
 491 }
 492
 493 int make_ext4fs_internal(int fd, const char *_directory,
 494                                                  const char *_mountpoint, fs_config_func_t fs_config_func, int gzip,
 495                                                  int sparse, int crc, int wipe,
 496                                                  struct selabel_handle *sehnd, int verbose, time_t fixed_time,
 497                                                  FILE* block_list_file)
 498 {
 499         u32 root_inode_num;
 500         u16 root_mode;
 501         char *mountpoint;
 502         char *directory = NULL;
 503
 504         if (setjmp(setjmp_env))
 505                 return EXIT_FAILURE; /* Handle a call to longjmp() */
 506
 507         if (_mountpoint == NULL) {
 508                 mountpoint = strdup("");
 509         } else {
 510                 mountpoint = canonicalize_abs_slashes(_mountpoint);
 511         }
 512
 513         if (_directory) {
 514                 directory = canonicalize_rel_slashes(_directory);
 515         }
 516
 517         if (info.len <= 0)
 518                 info.len = get_file_size(fd);
 519
 520         if (info.len <= 0) {
 521                 fprintf(stderr, "Need size of filesystem\n");
 522                 return EXIT_FAILURE;
 523         }
 524
 525         if (info.block_size <= 0)
 526                 info.block_size = compute_block_size();
 527
 528         /* Round down the filesystem length to be a multiple of the block size */
 529         info.len &= ~((u64)info.block_size - 1);
 530
 531         if (info.journal_blocks == 0)
 532                 info.journal_blocks = compute_journal_blocks();
 533
 534         if (info.no_journal == 0)
 535                 info.feat_compat = EXT4_FEATURE_COMPAT_HAS_JOURNAL;
 536         else
 537                 info.journal_blocks = 0;
 538
 539         if (info.blocks_per_group <= 0)
 540                 info.blocks_per_group = compute_blocks_per_group();
 541
 542         if (info.inodes <= 0)
 543                 info.inodes = compute_inodes();
 544
 545         if (info.inode_size <= 0)
 546                 info.inode_size = 256;
 547
 548         if (info.label == NULL)
 549                 info.label = "";
 550
 551         info.inodes_per_group = compute_inodes_per_group();
 552
 553         info.feat_compat |=
 554                         EXT4_FEATURE_COMPAT_RESIZE_INODE |
 555                         EXT4_FEATURE_COMPAT_EXT_ATTR;
 556
 557         info.feat_ro_compat |=
 558                         EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER |
 559                         EXT4_FEATURE_RO_COMPAT_LARGE_FILE |
 560                         EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
 561
 562         info.feat_incompat |=
 563                         EXT4_FEATURE_INCOMPAT_EXTENTS |
 564                         EXT4_FEATURE_INCOMPAT_FILETYPE;
 565
 566
 567         info.bg_desc_reserve_blocks = compute_bg_desc_reserve_blocks();
 568
 569         printf("Creating filesystem with parameters:\n");
 570         printf("    Size: %"PRIu64"\n", info.len);
 571         printf("    Block size: %d\n", info.block_size);
 572         printf("    Blocks per group: %d\n", info.blocks_per_group);
 573         printf("    Inodes per group: %d\n", info.inodes_per_group);
 574         printf("    Inode size: %d\n", info.inode_size);
 575         printf("    Journal blocks: %d\n", info.journal_blocks);
 576         printf("    Label: %s\n", info.label);
 577
 578         ext4_create_fs_aux_info();
 579
 580         printf("    Blocks: %"PRIu64"\n", aux_info.len_blocks);
 581         printf("    Block groups: %d\n", aux_info.groups);
 582         printf("    Reserved block group size: %d\n", info.bg_desc_reserve_blocks);
 583
 584         ext4_sparse_file = sparse_file_new(info.block_size, info.len);
 585
 586         block_allocator_init();
 587
 588         ext4_fill_in_sb();
 589
 590         if (reserve_inodes(0, 10) == EXT4_ALLOCATE_FAILED)
 591                 error("failed to reserve first 10 inodes");
 592
 593         if (info.feat_compat & EXT4_FEATURE_COMPAT_HAS_JOURNAL)
 594                 ext4_create_journal_inode();
 595
 596         if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE)
 597                 ext4_create_resize_inode();
 598
 599 #ifdef USE_MINGW
 600         // Windows needs only 'create an empty fs image' functionality
 601         assert(!directory);
 602         root_inode_num = build_default_directory_structure(mountpoint, sehnd);
 603 #else
 604         if (directory)
 605                 root_inode_num = build_directory_structure(directory, mountpoint, 0,
 606                         fs_config_func, sehnd, verbose, fixed_time);
 607         else
 608                 root_inode_num = build_default_directory_structure(mountpoint, sehnd);
 609 #endif
 610
 611         root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
 612         inode_set_permissions(root_inode_num, root_mode, 0, 0, 0);
 613
 614 #ifndef USE_MINGW
 615         if (sehnd) {
 616                 char *secontext = NULL;
 617
 618                 if (selabel_lookup(sehnd, &secontext, mountpoint, S_IFDIR) < 0) {
 619                         error("cannot lookup security context for %s", mountpoint);
 620                 }
 621                 if (secontext) {
 622                         if (verbose) {
 623                                 printf("Labeling %s as %s\n", mountpoint, secontext);
 624                         }
 625                         inode_set_selinux(root_inode_num, secontext);
 626                 }
 627                 freecon(secontext);
 628         }
 629 #endif
 630
 631         ext4_update_free();
 632
 633         ext4_queue_sb();
 634
 635         if (block_list_file) {
 636                 size_t dirlen = directory ? strlen(directory) : 0;
 637                 struct block_allocation* p = get_saved_allocation_chain();
 638                 while (p) {
 639                         if (directory && strncmp(p->filename, directory, dirlen) == 0) {
 640                                 // substitute mountpoint for the leading directory in the filename, in the output file
 641                                 fprintf(block_list_file, "%s%s", mountpoint, p->filename + dirlen);
 642                         } else {
 643                                 fprintf(block_list_file, "%s", p->filename);
 644                         }
 645                         print_blocks(block_list_file, p);
 646                         struct block_allocation* pn = p->next;
 647                         free_alloc(p);
 648                         p = pn;
 649                 }
 650         }
 651
 652         printf("Created filesystem with %d/%d inodes and %d/%d blocks\n",
 653                         aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count,
 654                         aux_info.sb->s_inodes_count,
 655                         aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo,
 656                         aux_info.sb->s_blocks_count_lo);
 657
 658         if (wipe && WIPE_IS_SUPPORTED) {
 659                 wipe_block_device(fd, info.len);
 660         }
 661
 662         write_ext4_image(fd, gzip, sparse, crc);
 663
 664         sparse_file_destroy(ext4_sparse_file);
 665         ext4_sparse_file = NULL;
 666
 667         free(mountpoint);
 668         free(directory);
 669
 670         return 0;
 671 }