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