mkfs/rootdir.c

   1 /*
   2  * Copyright (C) 2017 SUSE.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program.
  15  */
  16
  17 #include "kerncompat.h"
  18 #include "androidcompat.h"
  19
  20 #include <sys/stat.h>
  21 #include <sys/types.h>
  22 #include <sys/xattr.h>
  23 #include <linux/limits.h>
  24 #include <dirent.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <ftw.h>
  28 #include "ctree.h"
  29 #include "internal.h"
  30 #include "disk-io.h"
  31 #include "messages.h"
  32 #include "transaction.h"
  33 #include "utils.h"
  34 #include "mkfs/rootdir.h"
  35 #include "send-utils.h"
  36
  37 /*
  38  * This ignores symlinks with unreadable targets and subdirs that can't
  39  * be read.  It's a best-effort to give a rough estimate of the size of
  40  * a subdir.  It doesn't guarantee that prepopulating btrfs from this
  41  * tree won't still run out of space.
  42  */
  43 static u64 global_total_size;
  44 static u64 fs_block_size;
  45
  46 static u64 index_cnt = 2;
  47
  48 static int add_directory_items(struct btrfs_trans_handle *trans,
  49                                struct btrfs_root *root, u64 objectid,
  50                                ino_t parent_inum, const char *name,
  51                                struct stat *st, int *dir_index_cnt)
  52 {
  53         int ret;
  54         int name_len;
  55         struct btrfs_key location;
  56         u8 filetype = 0;
  57
  58         name_len = strlen(name);
  59
  60         location.objectid = objectid;
  61         location.offset = 0;
  62         location.type = BTRFS_INODE_ITEM_KEY;
  63
  64         if (S_ISDIR(st->st_mode))
  65                 filetype = BTRFS_FT_DIR;
  66         if (S_ISREG(st->st_mode))
  67                 filetype = BTRFS_FT_REG_FILE;
  68         if (S_ISLNK(st->st_mode))
  69                 filetype = BTRFS_FT_SYMLINK;
  70         if (S_ISSOCK(st->st_mode))
  71                 filetype = BTRFS_FT_SOCK;
  72         if (S_ISCHR(st->st_mode))
  73                 filetype = BTRFS_FT_CHRDEV;
  74         if (S_ISBLK(st->st_mode))
  75                 filetype = BTRFS_FT_BLKDEV;
  76         if (S_ISFIFO(st->st_mode))
  77                 filetype = BTRFS_FT_FIFO;
  78
  79         ret = btrfs_insert_dir_item(trans, root, name, name_len,
  80                                     parent_inum, &location,
  81                                     filetype, index_cnt);
  82         if (ret)
  83                 return ret;
  84         ret = btrfs_insert_inode_ref(trans, root, name, name_len,
  85                                      objectid, parent_inum, index_cnt);
  86         *dir_index_cnt = index_cnt;
  87         index_cnt++;
  88
  89         return ret;
  90 }
  91
  92 static int fill_inode_item(struct btrfs_trans_handle *trans,
  93                            struct btrfs_root *root,
  94                            struct btrfs_inode_item *dst, struct stat *src)
  95 {
  96         u64 blocks = 0;
  97         u64 sectorsize = root->fs_info->sectorsize;
  98
  99         /*
 100          * btrfs_inode_item has some reserved fields
 101          * and represents on-disk inode entry, so
 102          * zero everything to prevent information leak
 103          */
 104         memset(dst, 0, sizeof(*dst));
 105
 106         btrfs_set_stack_inode_generation(dst, trans->transid);
 107         btrfs_set_stack_inode_size(dst, src->st_size);
 108         btrfs_set_stack_inode_nbytes(dst, 0);
 109         btrfs_set_stack_inode_block_group(dst, 0);
 110         btrfs_set_stack_inode_nlink(dst, src->st_nlink);
 111         btrfs_set_stack_inode_uid(dst, src->st_uid);
 112         btrfs_set_stack_inode_gid(dst, src->st_gid);
 113         btrfs_set_stack_inode_mode(dst, src->st_mode);
 114         btrfs_set_stack_inode_rdev(dst, 0);
 115         btrfs_set_stack_inode_flags(dst, 0);
 116         btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
 117         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 118         btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
 119         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 120         btrfs_set_stack_timespec_sec(&dst->mtime, src->st_mtime);
 121         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 122         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 123         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 124
 125         if (S_ISDIR(src->st_mode)) {
 126                 btrfs_set_stack_inode_size(dst, 0);
 127                 btrfs_set_stack_inode_nlink(dst, 1);
 128         }
 129         if (S_ISREG(src->st_mode)) {
 130                 btrfs_set_stack_inode_size(dst, (u64)src->st_size);
 131                 if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
 132                         btrfs_set_stack_inode_nbytes(dst, src->st_size);
 133                 else {
 134                         blocks = src->st_size / sectorsize;
 135                         if (src->st_size % sectorsize)
 136                                 blocks += 1;
 137                         blocks *= sectorsize;
 138                         btrfs_set_stack_inode_nbytes(dst, blocks);
 139                 }
 140         }
 141         if (S_ISLNK(src->st_mode))
 142                 btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
 143
 144         return 0;
 145 }
 146
 147 static int directory_select(const struct direct *entry)
 148 {
 149         if (entry->d_name[0] == '.' &&
 150                 (entry->d_name[1] == 0 ||
 151                  (entry->d_name[1] == '.' && entry->d_name[2] == 0)))
 152                 return 0;
 153         return 1;
 154 }
 155
 156 static void free_namelist(struct direct **files, int count)
 157 {
 158         int i;
 159
 160         if (count < 0)
 161                 return;
 162
 163         for (i = 0; i < count; ++i)
 164                 free(files[i]);
 165         free(files);
 166 }
 167
 168 static u64 calculate_dir_inode_size(const char *dirname)
 169 {
 170         int count, i;
 171         struct direct **files, *cur_file;
 172         u64 dir_inode_size = 0;
 173
 174         count = scandir(dirname, &files, directory_select, NULL);
 175
 176         for (i = 0; i < count; i++) {
 177                 cur_file = files[i];
 178                 dir_inode_size += strlen(cur_file->d_name);
 179         }
 180
 181         free_namelist(files, count);
 182
 183         dir_inode_size *= 2;
 184         return dir_inode_size;
 185 }
 186
 187 static int add_inode_items(struct btrfs_trans_handle *trans,
 188                            struct btrfs_root *root,
 189                            struct stat *st, const char *name,
 190                            u64 self_objectid,
 191                            struct btrfs_inode_item *inode_ret)
 192 {
 193         int ret;
 194         struct btrfs_inode_item btrfs_inode;
 195         u64 objectid;
 196         u64 inode_size = 0;
 197
 198         fill_inode_item(trans, root, &btrfs_inode, st);
 199         objectid = self_objectid;
 200
 201         if (S_ISDIR(st->st_mode)) {
 202                 inode_size = calculate_dir_inode_size(name);
 203                 btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
 204         }
 205
 206         ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 207
 208         *inode_ret = btrfs_inode;
 209         return ret;
 210 }
 211
 212 static int add_xattr_item(struct btrfs_trans_handle *trans,
 213                           struct btrfs_root *root, u64 objectid,
 214                           const char *file_name)
 215 {
 216         int ret;
 217         int cur_name_len;
 218         char xattr_list[XATTR_LIST_MAX];
 219         char *cur_name;
 220         char cur_value[XATTR_SIZE_MAX];
 221         char delimiter = '\0';
 222         char *next_location = xattr_list;
 223
 224         ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
 225         if (ret < 0) {
 226                 if (errno == ENOTSUP)
 227                         return 0;
 228                 error("getting a list of xattr failed for %s: %s", file_name,
 229                                 strerror(errno));
 230                 return ret;
 231         }
 232         if (ret == 0)
 233                 return ret;
 234
 235         cur_name = strtok(xattr_list, &delimiter);
 236         while (cur_name != NULL) {
 237                 cur_name_len = strlen(cur_name);
 238                 next_location += cur_name_len + 1;
 239
 240                 ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
 241                 if (ret < 0) {
 242                         if (errno == ENOTSUP)
 243                                 return 0;
 244                         error("gettig a xattr value failed for %s attr %s: %s",
 245                                 file_name, cur_name, strerror(errno));
 246                         return ret;
 247                 }
 248
 249                 ret = btrfs_insert_xattr_item(trans, root, cur_name,
 250                                               cur_name_len, cur_value,
 251                                               ret, objectid);
 252                 if (ret) {
 253                         error("inserting a xattr item failed for %s: %s",
 254                                         file_name, strerror(-ret));
 255                 }
 256
 257                 cur_name = strtok(next_location, &delimiter);
 258         }
 259
 260         return ret;
 261 }
 262
 263 static int add_symbolic_link(struct btrfs_trans_handle *trans,
 264                              struct btrfs_root *root,
 265                              u64 objectid, const char *path_name)
 266 {
 267         int ret;
 268         char buf[PATH_MAX];
 269
 270         ret = readlink(path_name, buf, sizeof(buf));
 271         if (ret <= 0) {
 272                 error("readlink failed for %s: %s", path_name, strerror(errno));
 273                 goto fail;
 274         }
 275         if (ret >= sizeof(buf)) {
 276                 error("symlink too long for %s", path_name);
 277                 ret = -1;
 278                 goto fail;
 279         }
 280
 281         buf[ret] = '\0'; /* readlink does not do it for us */
 282         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 283                                          buf, ret + 1);
 284 fail:
 285         return ret;
 286 }
 287
 288 static int add_file_items(struct btrfs_trans_handle *trans,
 289                           struct btrfs_root *root,
 290                           struct btrfs_inode_item *btrfs_inode, u64 objectid,
 291                           struct stat *st, const char *path_name)
 292 {
 293         int ret = -1;
 294         ssize_t ret_read;
 295         u64 bytes_read = 0;
 296         struct btrfs_key key;
 297         int blocks;
 298         u32 sectorsize = root->fs_info->sectorsize;
 299         u64 first_block = 0;
 300         u64 file_pos = 0;
 301         u64 cur_bytes;
 302         u64 total_bytes;
 303         struct extent_buffer *eb = NULL;
 304         int fd;
 305
 306         if (st->st_size == 0)
 307                 return 0;
 308
 309         fd = open(path_name, O_RDONLY);
 310         if (fd == -1) {
 311                 error("cannot open %s: %s", path_name, strerror(errno));
 312                 return ret;
 313         }
 314
 315         blocks = st->st_size / sectorsize;
 316         if (st->st_size % sectorsize)
 317                 blocks += 1;
 318
 319         if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 320                 char *buffer = malloc(st->st_size);
 321
 322                 if (!buffer) {
 323                         ret = -ENOMEM;
 324                         goto end;
 325                 }
 326
 327                 ret_read = pread64(fd, buffer, st->st_size, bytes_read);
 328                 if (ret_read == -1) {
 329                         error("cannot read %s at offset %llu length %llu: %s",
 330                                 path_name, (unsigned long long)bytes_read,
 331                                 (unsigned long long)st->st_size,
 332                                 strerror(errno));
 333                         free(buffer);
 334                         goto end;
 335                 }
 336
 337                 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 338                                                  buffer, st->st_size);
 339                 free(buffer);
 340                 goto end;
 341         }
 342
 343         /* round up our st_size to the FS blocksize */
 344         total_bytes = (u64)blocks * sectorsize;
 345
 346         /*
 347          * do our IO in extent buffers so it can work
 348          * against any raid type
 349          */
 350         eb = calloc(1, sizeof(*eb) + sectorsize);
 351         if (!eb) {
 352                 ret = -ENOMEM;
 353                 goto end;
 354         }
 355
 356 again:
 357
 358         /*
 359          * keep our extent size at 1MB max, this makes it easier to work inside
 360          * the tiny block groups created during mkfs
 361          */
 362         cur_bytes = min(total_bytes, (u64)SZ_1M);
 363         ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
 364                                    &key, 1);
 365         if (ret)
 366                 goto end;
 367
 368         first_block = key.objectid;
 369         bytes_read = 0;
 370
 371         while (bytes_read < cur_bytes) {
 372
 373                 memset(eb->data, 0, sectorsize);
 374
 375                 ret_read = pread64(fd, eb->data, sectorsize, file_pos +
 376                                    bytes_read);
 377                 if (ret_read == -1) {
 378                         error("cannot read %s at offset %llu length %llu: %s",
 379                                 path_name,
 380                                 (unsigned long long)file_pos + bytes_read,
 381                                 (unsigned long long)sectorsize,
 382                                 strerror(errno));
 383                         goto end;
 384                 }
 385
 386                 eb->start = first_block + bytes_read;
 387                 eb->len = sectorsize;
 388
 389                 /*
 390                  * we're doing the csum before we record the extent, but
 391                  * that's ok
 392                  */
 393                 ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
 394                                 first_block + bytes_read + sectorsize,
 395                                 first_block + bytes_read,
 396                                 eb->data, sectorsize);
 397                 if (ret)
 398                         goto end;
 399
 400                 ret = write_and_map_eb(root->fs_info, eb);
 401                 if (ret) {
 402                         error("failed to write %s", path_name);
 403                         goto end;
 404                 }
 405
 406                 bytes_read += sectorsize;
 407         }
 408
 409         if (bytes_read) {
 410                 ret = btrfs_record_file_extent(trans, root, objectid,
 411                                 btrfs_inode, file_pos, first_block, cur_bytes);
 412                 if (ret)
 413                         goto end;
 414
 415         }
 416
 417         file_pos += cur_bytes;
 418         total_bytes -= cur_bytes;
 419
 420         if (total_bytes)
 421                 goto again;
 422
 423 end:
 424         free(eb);
 425         close(fd);
 426         return ret;
 427 }
 428
 429 static int traverse_directory(struct btrfs_trans_handle *trans,
 430                               struct btrfs_root *root, const char *dir_name,
 431                               struct directory_name_entry *dir_head)
 432 {
 433         int ret = 0;
 434
 435         struct btrfs_inode_item cur_inode;
 436         struct btrfs_inode_item *inode_item;
 437         int count, i, dir_index_cnt;
 438         struct direct **files;
 439         struct stat st;
 440         struct directory_name_entry *dir_entry, *parent_dir_entry;
 441         struct direct *cur_file;
 442         ino_t parent_inum, cur_inum;
 443         ino_t highest_inum = 0;
 444         const char *parent_dir_name;
 445         char real_path[PATH_MAX];
 446         struct btrfs_path path;
 447         struct extent_buffer *leaf;
 448         struct btrfs_key root_dir_key;
 449         u64 root_dir_inode_size = 0;
 450
 451         /* Add list for source directory */
 452         dir_entry = malloc(sizeof(struct directory_name_entry));
 453         if (!dir_entry)
 454                 return -ENOMEM;
 455         dir_entry->dir_name = dir_name;
 456         dir_entry->path = realpath(dir_name, real_path);
 457         if (!dir_entry->path) {
 458                 error("realpath  failed for %s: %s", dir_name, strerror(errno));
 459                 ret = -1;
 460                 goto fail_no_dir;
 461         }
 462
 463         parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
 464         dir_entry->inum = parent_inum;
 465         list_add_tail(&dir_entry->list, &dir_head->list);
 466
 467         btrfs_init_path(&path);
 468
 469         root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
 470         root_dir_key.offset = 0;
 471         root_dir_key.type = BTRFS_INODE_ITEM_KEY;
 472         ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
 473         if (ret) {
 474                 error("failed to lookup root dir: %d", ret);
 475                 goto fail_no_dir;
 476         }
 477
 478         leaf = path.nodes[0];
 479         inode_item = btrfs_item_ptr(leaf, path.slots[0],
 480                                     struct btrfs_inode_item);
 481
 482         root_dir_inode_size = calculate_dir_inode_size(dir_name);
 483         btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
 484         btrfs_mark_buffer_dirty(leaf);
 485
 486         btrfs_release_path(&path);
 487
 488         do {
 489                 parent_dir_entry = list_entry(dir_head->list.next,
 490                                               struct directory_name_entry,
 491                                               list);
 492                 list_del(&parent_dir_entry->list);
 493
 494                 parent_inum = parent_dir_entry->inum;
 495                 parent_dir_name = parent_dir_entry->dir_name;
 496                 if (chdir(parent_dir_entry->path)) {
 497                         error("chdir failed for %s: %s",
 498                                 parent_dir_name, strerror(errno));
 499                         ret = -1;
 500                         goto fail_no_files;
 501                 }
 502
 503                 count = scandir(parent_dir_entry->path, &files,
 504                                 directory_select, NULL);
 505                 if (count == -1) {
 506                         error("scandir failed for %s: %s",
 507                                 parent_dir_name, strerror(errno));
 508                         ret = -1;
 509                         goto fail;
 510                 }
 511
 512                 for (i = 0; i < count; i++) {
 513                         cur_file = files[i];
 514
 515                         if (lstat(cur_file->d_name, &st) == -1) {
 516                                 error("lstat failed for %s: %s",
 517                                         cur_file->d_name, strerror(errno));
 518                                 ret = -1;
 519                                 goto fail;
 520                         }
 521
 522                         cur_inum = st.st_ino;
 523                         ret = add_directory_items(trans, root,
 524                                                   cur_inum, parent_inum,
 525                                                   cur_file->d_name,
 526                                                   &st, &dir_index_cnt);
 527                         if (ret) {
 528                                 error("unable to add directory items for %s: %d",
 529                                         cur_file->d_name, ret);
 530                                 goto fail;
 531                         }
 532
 533                         ret = add_inode_items(trans, root, &st,
 534                                               cur_file->d_name, cur_inum,
 535                                               &cur_inode);
 536                         if (ret == -EEXIST) {
 537                                 if (st.st_nlink <= 1) {
 538                                         error(
 539                         "item %s already exists but has wrong st_nlink %lu <= 1",
 540                                                 cur_file->d_name,
 541                                                 (unsigned long)st.st_nlink);
 542                                         goto fail;
 543                                 }
 544                                 continue;
 545                         }
 546                         if (ret) {
 547                                 error("unable to add inode items for %s: %d",
 548                                         cur_file->d_name, ret);
 549                                 goto fail;
 550                         }
 551
 552                         ret = add_xattr_item(trans, root,
 553                                              cur_inum, cur_file->d_name);
 554                         if (ret) {
 555                                 error("unable to add xattr items for %s: %d",
 556                                         cur_file->d_name, ret);
 557                                 if (ret != -ENOTSUP)
 558                                         goto fail;
 559                         }
 560
 561                         if (S_ISDIR(st.st_mode)) {
 562                                 char tmp[PATH_MAX];
 563
 564                                 dir_entry = malloc(sizeof(*dir_entry));
 565                                 if (!dir_entry) {
 566                                         ret = -ENOMEM;
 567                                         goto fail;
 568                                 }
 569                                 dir_entry->dir_name = cur_file->d_name;
 570                                 if (path_cat_out(tmp, parent_dir_entry->path,
 571                                                         cur_file->d_name)) {
 572                                         error("invalid path: %s/%s",
 573                                                         parent_dir_entry->path,
 574                                                         cur_file->d_name);
 575                                         ret = -EINVAL;
 576                                         goto fail;
 577                                 }
 578                                 dir_entry->path = strdup(tmp);
 579                                 if (!dir_entry->path) {
 580                                         error("not enough memory to store path");
 581                                         ret = -ENOMEM;
 582                                         goto fail;
 583                                 }
 584                                 dir_entry->inum = cur_inum;
 585                                 list_add_tail(&dir_entry->list,
 586                                               &dir_head->list);
 587                         } else if (S_ISREG(st.st_mode)) {
 588                                 ret = add_file_items(trans, root, &cur_inode,
 589                                                      cur_inum, &st,
 590                                                      cur_file->d_name);
 591                                 if (ret) {
 592                                         error("unable to add file items for %s: %d",
 593                                                 cur_file->d_name, ret);
 594                                         goto fail;
 595                                 }
 596                         } else if (S_ISLNK(st.st_mode)) {
 597                                 ret = add_symbolic_link(trans, root,
 598                                                 cur_inum, cur_file->d_name);
 599                                 if (ret) {
 600                                         error("unable to add symlink for %s: %d",
 601                                                 cur_file->d_name, ret);
 602                                         goto fail;
 603                                 }
 604                         }
 605                 }
 606
 607                 free_namelist(files, count);
 608                 free(parent_dir_entry);
 609
 610                 index_cnt = 2;
 611
 612         } while (!list_empty(&dir_head->list));
 613
 614 out:
 615         return !!ret;
 616 fail:
 617         free_namelist(files, count);
 618 fail_no_files:
 619         free(parent_dir_entry);
 620         goto out;
 621 fail_no_dir:
 622         free(dir_entry);
 623         goto out;
 624 }
 625
 626 int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root,
 627                         bool verbose)
 628 {
 629         int ret;
 630         struct btrfs_trans_handle *trans;
 631         struct stat root_st;
 632         struct directory_name_entry dir_head;
 633         struct directory_name_entry *dir_entry = NULL;
 634
 635         ret = lstat(source_dir, &root_st);
 636         if (ret) {
 637                 error("unable to lstat %s: %s", source_dir, strerror(errno));
 638                 ret = -errno;
 639                 goto out;
 640         }
 641
 642         INIT_LIST_HEAD(&dir_head.list);
 643
 644         trans = btrfs_start_transaction(root, 1);
 645         BUG_ON(IS_ERR(trans));
 646         ret = traverse_directory(trans, root, source_dir, &dir_head);
 647         if (ret) {
 648                 error("unable to traverse directory %s: %d", source_dir, ret);
 649                 goto fail;
 650         }
 651         ret = btrfs_commit_transaction(trans, root);
 652         if (ret) {
 653                 error("transaction commit failed: %d", ret);
 654                 goto out;
 655         }
 656
 657         if (verbose)
 658                 printf("Making image is completed.\n");
 659         return 0;
 660 fail:
 661         /*
 662          * Since we don't have btrfs_abort_transaction() yet, uncommitted trans
 663          * will trigger a BUG_ON().
 664          *
 665          * However before mkfs is fully finished, the magic number is invalid,
 666          * so even we commit transaction here, the fs still can't be mounted.
 667          *
 668          * To do a graceful error out, here we commit transaction as a
 669          * workaround.
 670          * Since we have already hit some problem, the return value doesn't
 671          * matter now.
 672          */
 673         btrfs_commit_transaction(trans, root);
 674         while (!list_empty(&dir_head.list)) {
 675                 dir_entry = list_entry(dir_head.list.next,
 676                                        struct directory_name_entry, list);
 677                 list_del(&dir_entry->list);
 678                 free(dir_entry);
 679         }
 680 out:
 681         return ret;
 682 }
 683
 684 static int ftw_add_entry_size(const char *fpath, const struct stat *st,
 685                               int type)
 686 {
 687         if (type == FTW_F || type == FTW_D)
 688                 global_total_size += round_up(st->st_size, fs_block_size);
 689
 690         return 0;
 691 }
 692
 693 u64 btrfs_mkfs_size_dir(const char *dir_name, u64 sectorsize,
 694                         u64 *num_of_meta_chunks_ret, u64 *size_of_data_ret)
 695 {
 696         u64 dir_size = 0;
 697         u64 total_size = 0;
 698         int ret;
 699         u64 default_chunk_size = SZ_8M;
 700         u64 allocated_meta_size = SZ_8M;
 701         u64 allocated_total_size = 20 * SZ_1M;  /* 20MB */
 702         u64 num_of_meta_chunks = 0;
 703         u64 num_of_data_chunks = 0;
 704         u64 num_of_allocated_meta_chunks =
 705                         allocated_meta_size / default_chunk_size;
 706
 707         global_total_size = 0;
 708         fs_block_size = sectorsize;
 709         ret = ftw(dir_name, ftw_add_entry_size, 10);
 710         dir_size = global_total_size;
 711         if (ret < 0) {
 712                 error("ftw subdir walk of %s failed: %s", dir_name,
 713                         strerror(errno));
 714                 exit(1);
 715         }
 716
 717         num_of_data_chunks = (dir_size + default_chunk_size - 1) /
 718                 default_chunk_size;
 719
 720         num_of_meta_chunks = (dir_size / 2) / default_chunk_size;
 721         if (((dir_size / 2) % default_chunk_size) != 0)
 722                 num_of_meta_chunks++;
 723         if (num_of_meta_chunks <= num_of_allocated_meta_chunks)
 724                 num_of_meta_chunks = 0;
 725         else
 726                 num_of_meta_chunks -= num_of_allocated_meta_chunks;
 727
 728         total_size = allocated_total_size +
 729                      (num_of_data_chunks * default_chunk_size) +
 730                      (num_of_meta_chunks * default_chunk_size);
 731
 732         *num_of_meta_chunks_ret = num_of_meta_chunks;
 733         *size_of_data_ret = num_of_data_chunks * default_chunk_size;
 734         return total_size;
 735 }