mkfs.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  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; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #define _XOPEN_SOURCE 500
  20 #define _GNU_SOURCE
  21
  22 #include "kerncompat.h"
  23
  24 #ifndef __CHECKER__
  25 #include <sys/ioctl.h>
  26 #include <sys/mount.h>
  27 #include "ioctl.h"
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <sys/dir.h>
  35 #include <fcntl.h>
  36 #include <unistd.h>
  37 #include <getopt.h>
  38 #include <uuid/uuid.h>
  39 #include <linux/fs.h>
  40 #include <ctype.h>
  41 #include <attr/xattr.h>
  42 #include <blkid/blkid.h>
  43 #include <ftw.h>
  44 #include "ctree.h"
  45 #include "disk-io.h"
  46 #include "volumes.h"
  47 #include "transaction.h"
  48 #include "utils.h"
  49 #include "version.h"
  50
  51 static u64 index_cnt = 2;
  52
  53 struct directory_name_entry {
  54         char *dir_name;
  55         char *path;
  56         ino_t inum;
  57         struct list_head list;
  58 };
  59
  60 static int make_root_dir(struct btrfs_root *root, int mixed)
  61 {
  62         struct btrfs_trans_handle *trans;
  63         struct btrfs_key location;
  64         u64 bytes_used;
  65         u64 chunk_start = 0;
  66         u64 chunk_size = 0;
  67         int ret;
  68
  69         trans = btrfs_start_transaction(root, 1);
  70         bytes_used = btrfs_super_bytes_used(root->fs_info->super_copy);
  71
  72         root->fs_info->system_allocs = 1;
  73         ret = btrfs_make_block_group(trans, root, bytes_used,
  74                                      BTRFS_BLOCK_GROUP_SYSTEM,
  75                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  76                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  77         BUG_ON(ret);
  78
  79         if (mixed) {
  80                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  81                                         &chunk_start, &chunk_size,
  82                                         BTRFS_BLOCK_GROUP_METADATA |
  83                                         BTRFS_BLOCK_GROUP_DATA);
  84                 BUG_ON(ret);
  85                 ret = btrfs_make_block_group(trans, root, 0,
  86                                              BTRFS_BLOCK_GROUP_METADATA |
  87                                              BTRFS_BLOCK_GROUP_DATA,
  88                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  89                                              chunk_start, chunk_size);
  90                 BUG_ON(ret);
  91                 printf("Created a data/metadata chunk of size %llu\n", chunk_size);
  92         } else {
  93                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  94                                         &chunk_start, &chunk_size,
  95                                         BTRFS_BLOCK_GROUP_METADATA);
  96                 BUG_ON(ret);
  97                 ret = btrfs_make_block_group(trans, root, 0,
  98                                              BTRFS_BLOCK_GROUP_METADATA,
  99                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 100                                              chunk_start, chunk_size);
 101                 BUG_ON(ret);
 102         }
 103
 104         root->fs_info->system_allocs = 0;
 105         btrfs_commit_transaction(trans, root);
 106         trans = btrfs_start_transaction(root, 1);
 107         BUG_ON(!trans);
 108
 109         if (!mixed) {
 110                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 111                                         &chunk_start, &chunk_size,
 112                                         BTRFS_BLOCK_GROUP_DATA);
 113                 BUG_ON(ret);
 114                 ret = btrfs_make_block_group(trans, root, 0,
 115                                              BTRFS_BLOCK_GROUP_DATA,
 116                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 117                                              chunk_start, chunk_size);
 118                 BUG_ON(ret);
 119         }
 120
 121         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 122                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 123         if (ret)
 124                 goto err;
 125         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 126         if (ret)
 127                 goto err;
 128         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 129         location.offset = (u64)-1;
 130         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 131                         "default", 7,
 132                         btrfs_super_root_dir(root->fs_info->super_copy),
 133                         &location, BTRFS_FT_DIR, 0);
 134         if (ret)
 135                 goto err;
 136
 137         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 138                              "default", 7, location.objectid,
 139                              BTRFS_ROOT_TREE_DIR_OBJECTID, 0);
 140         if (ret)
 141                 goto err;
 142
 143         btrfs_commit_transaction(trans, root);
 144 err:
 145         return ret;
 146 }
 147
 148 static void __recow_root(struct btrfs_trans_handle *trans,
 149                          struct btrfs_root *root)
 150 {
 151         int ret;
 152         struct extent_buffer *tmp;
 153
 154         if (trans->transid != btrfs_root_generation(&root->root_item)) {
 155                 ret = __btrfs_cow_block(trans, root, root->node,
 156                                         NULL, 0, &tmp, 0, 0);
 157                 BUG_ON(ret);
 158                 free_extent_buffer(tmp);
 159         }
 160 }
 161
 162 static void recow_roots(struct btrfs_trans_handle *trans,
 163                        struct btrfs_root *root)
 164 {
 165         struct btrfs_fs_info *info = root->fs_info;
 166
 167         __recow_root(trans, info->fs_root);
 168         __recow_root(trans, info->tree_root);
 169         __recow_root(trans, info->extent_root);
 170         __recow_root(trans, info->chunk_root);
 171         __recow_root(trans, info->dev_root);
 172         __recow_root(trans, info->csum_root);
 173 }
 174
 175 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 176                               struct btrfs_root *root, u64 type)
 177 {
 178         u64 chunk_start;
 179         u64 chunk_size;
 180         int ret;
 181
 182         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 183                                 &chunk_start, &chunk_size, type);
 184         BUG_ON(ret);
 185         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 186                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 187                                      chunk_start, chunk_size);
 188         BUG_ON(ret);
 189         return ret;
 190 }
 191
 192 static int create_raid_groups(struct btrfs_trans_handle *trans,
 193                               struct btrfs_root *root, u64 data_profile,
 194                               int data_profile_opt, u64 metadata_profile,
 195                               int metadata_profile_opt, int mixed, int ssd)
 196 {
 197         u64 num_devices = btrfs_super_num_devices(root->fs_info->super_copy);
 198         u64 allowed = 0;
 199         u64 devices_for_raid = num_devices;
 200         int ret;
 201
 202         /*
 203          * Set default profiles according to number of added devices.
 204          * For mixed groups defaults are single/single.
 205          */
 206         if (!metadata_profile_opt && !mixed) {
 207                 if (num_devices == 1 && ssd)
 208                         printf("Detected a SSD, turning off metadata "
 209                                "duplication.  Mkfs with -m dup if you want to "
 210                                "force metadata duplication.\n");
 211                 metadata_profile = (num_devices > 1) ?
 212                         BTRFS_BLOCK_GROUP_RAID1 : (ssd) ? 0: BTRFS_BLOCK_GROUP_DUP;
 213         }
 214         if (!data_profile_opt && !mixed) {
 215                 data_profile = (num_devices > 1) ?
 216                         BTRFS_BLOCK_GROUP_RAID0 : 0; /* raid0 or single */
 217         }
 218
 219         if (devices_for_raid > 4)
 220                 devices_for_raid = 4;
 221
 222         switch (devices_for_raid) {
 223         default:
 224         case 4:
 225                 allowed |= BTRFS_BLOCK_GROUP_RAID10;
 226         case 3:
 227                 allowed |= BTRFS_BLOCK_GROUP_RAID6;
 228         case 2:
 229                 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 230                         BTRFS_BLOCK_GROUP_RAID5;
 231                 break;
 232         case 1:
 233                 allowed |= BTRFS_BLOCK_GROUP_DUP;
 234         }
 235
 236         if (metadata_profile & ~allowed) {
 237                 fprintf(stderr, "unable to create FS with metadata "
 238                         "profile %llu (have %llu devices)\n", metadata_profile,
 239                         num_devices);
 240                 exit(1);
 241         }
 242         if (data_profile & ~allowed) {
 243                 fprintf(stderr, "unable to create FS with data "
 244                         "profile %llu (have %llu devices)\n", data_profile,
 245                         num_devices);
 246                 exit(1);
 247         }
 248
 249         /* allow dup'ed data chunks only in mixed mode */
 250         if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
 251                 fprintf(stderr, "dup for data is allowed only in mixed mode\n");
 252                 exit(1);
 253         }
 254
 255         if (allowed & metadata_profile) {
 256                 u64 meta_flags = BTRFS_BLOCK_GROUP_METADATA;
 257
 258                 ret = create_one_raid_group(trans, root,
 259                                             BTRFS_BLOCK_GROUP_SYSTEM |
 260                                             (allowed & metadata_profile));
 261                 BUG_ON(ret);
 262
 263                 if (mixed)
 264                         meta_flags |= BTRFS_BLOCK_GROUP_DATA;
 265
 266                 ret = create_one_raid_group(trans, root, meta_flags |
 267                                             (allowed & metadata_profile));
 268                 BUG_ON(ret);
 269
 270         }
 271         if (!mixed && num_devices > 1 && (allowed & data_profile)) {
 272                 ret = create_one_raid_group(trans, root,
 273                                             BTRFS_BLOCK_GROUP_DATA |
 274                                             (allowed & data_profile));
 275                 BUG_ON(ret);
 276         }
 277         recow_roots(trans, root);
 278
 279         return 0;
 280 }
 281
 282 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 283                                   struct btrfs_root *root)
 284 {
 285         struct btrfs_key location;
 286         struct btrfs_root_item root_item;
 287         struct extent_buffer *tmp;
 288         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 289         int ret;
 290
 291         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 292         BUG_ON(ret);
 293
 294         memcpy(&root_item, &root->root_item, sizeof(root_item));
 295         btrfs_set_root_bytenr(&root_item, tmp->start);
 296         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 297         btrfs_set_root_generation(&root_item, trans->transid);
 298         free_extent_buffer(tmp);
 299
 300         location.objectid = objectid;
 301         location.type = BTRFS_ROOT_ITEM_KEY;
 302         location.offset = 0;
 303         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 304                                 &location, &root_item);
 305         BUG_ON(ret);
 306         return 0;
 307 }
 308
 309 static void print_usage(void)
 310 {
 311         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 312         fprintf(stderr, "options:\n");
 313         fprintf(stderr, "\t -A --alloc-start the offset to start the FS\n");
 314         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 315         fprintf(stderr, "\t -d --data data profile, raid0, raid1, raid5, raid6, raid10, dup or single\n");
 316         fprintf(stderr, "\t -f --force force overwrite of existing filesystem\n");
 317         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 318         fprintf(stderr, "\t -L --label set a label\n");
 319         fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
 320         fprintf(stderr, "\t -M --mixed mix metadata and data together\n");
 321         fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
 322         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 323         fprintf(stderr, "\t -r --rootdir the source directory\n");
 324         fprintf(stderr, "\t -K --nodiscard do not perform whole device TRIM\n");
 325         fprintf(stderr, "\t -V --version print the mkfs.btrfs version and exit\n");
 326         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
 327         exit(1);
 328 }
 329
 330 static void print_version(void)
 331 {
 332         fprintf(stderr, "mkfs.btrfs, part of %s\n", BTRFS_BUILD_VERSION);
 333         exit(0);
 334 }
 335
 336 static u64 parse_profile(char *s)
 337 {
 338         if (strcmp(s, "raid0") == 0) {
 339                 return BTRFS_BLOCK_GROUP_RAID0;
 340         } else if (strcmp(s, "raid1") == 0) {
 341                 return BTRFS_BLOCK_GROUP_RAID1;
 342         } else if (strcmp(s, "raid5") == 0) {
 343                 return BTRFS_BLOCK_GROUP_RAID5;
 344         } else if (strcmp(s, "raid6") == 0) {
 345                 return BTRFS_BLOCK_GROUP_RAID6;
 346         } else if (strcmp(s, "raid10") == 0) {
 347                 return BTRFS_BLOCK_GROUP_RAID10;
 348         } else if (strcmp(s, "dup") == 0) {
 349                 return BTRFS_BLOCK_GROUP_DUP;
 350         } else if (strcmp(s, "single") == 0) {
 351                 return 0;
 352         } else {
 353                 fprintf(stderr, "Unknown profile %s\n", s);
 354                 print_usage();
 355         }
 356         /* not reached */
 357         return 0;
 358 }
 359
 360 static char *parse_label(char *input)
 361 {
 362         int len = strlen(input);
 363
 364         if (len >= BTRFS_LABEL_SIZE) {
 365                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 366                         BTRFS_LABEL_SIZE - 1);
 367                 exit(1);
 368         }
 369         return strdup(input);
 370 }
 371
 372 static struct option long_options[] = {
 373         { "alloc-start", 1, NULL, 'A'},
 374         { "byte-count", 1, NULL, 'b' },
 375         { "force", 0, NULL, 'f' },
 376         { "leafsize", 1, NULL, 'l' },
 377         { "label", 1, NULL, 'L'},
 378         { "metadata", 1, NULL, 'm' },
 379         { "mixed", 0, NULL, 'M' },
 380         { "nodesize", 1, NULL, 'n' },
 381         { "sectorsize", 1, NULL, 's' },
 382         { "data", 1, NULL, 'd' },
 383         { "version", 0, NULL, 'V' },
 384         { "rootdir", 1, NULL, 'r' },
 385         { "nodiscard", 0, NULL, 'K' },
 386         { 0, 0, 0, 0}
 387 };
 388
 389 static int add_directory_items(struct btrfs_trans_handle *trans,
 390                                struct btrfs_root *root, u64 objectid,
 391                                ino_t parent_inum, const char *name,
 392                                struct stat *st, int *dir_index_cnt)
 393 {
 394         int ret;
 395         int name_len;
 396         struct btrfs_key location;
 397         u8 filetype = 0;
 398
 399         name_len = strlen(name);
 400
 401         location.objectid = objectid;
 402         location.offset = 0;
 403         btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
 404
 405         if (S_ISDIR(st->st_mode))
 406                 filetype = BTRFS_FT_DIR;
 407         if (S_ISREG(st->st_mode))
 408                 filetype = BTRFS_FT_REG_FILE;
 409         if (S_ISLNK(st->st_mode))
 410                 filetype = BTRFS_FT_SYMLINK;
 411
 412         ret = btrfs_insert_dir_item(trans, root, name, name_len,
 413                                     parent_inum, &location,
 414                                     filetype, index_cnt);
 415
 416         *dir_index_cnt = index_cnt;
 417         index_cnt++;
 418
 419         return ret;
 420 }
 421
 422 static int fill_inode_item(struct btrfs_trans_handle *trans,
 423                            struct btrfs_root *root,
 424                            struct btrfs_inode_item *dst, struct stat *src)
 425 {
 426         u64 blocks = 0;
 427         u64 sectorsize = root->sectorsize;
 428
 429         /*
 430          * btrfs_inode_item has some reserved fields
 431          * and represents on-disk inode entry, so
 432          * zero everything to prevent information leak
 433          */
 434         memset(dst, 0, sizeof (*dst));
 435
 436         btrfs_set_stack_inode_generation(dst, trans->transid);
 437         btrfs_set_stack_inode_size(dst, src->st_size);
 438         btrfs_set_stack_inode_nbytes(dst, 0);
 439         btrfs_set_stack_inode_block_group(dst, 0);
 440         btrfs_set_stack_inode_nlink(dst, src->st_nlink);
 441         btrfs_set_stack_inode_uid(dst, src->st_uid);
 442         btrfs_set_stack_inode_gid(dst, src->st_gid);
 443         btrfs_set_stack_inode_mode(dst, src->st_mode);
 444         btrfs_set_stack_inode_rdev(dst, 0);
 445         btrfs_set_stack_inode_flags(dst, 0);
 446         btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
 447         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 448         btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
 449         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 450         btrfs_set_stack_timespec_sec(&dst->mtime, src->st_mtime);
 451         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 452         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 453         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 454
 455         if (S_ISDIR(src->st_mode)) {
 456                 btrfs_set_stack_inode_size(dst, 0);
 457                 btrfs_set_stack_inode_nlink(dst, 1);
 458         }
 459         if (S_ISREG(src->st_mode)) {
 460                 btrfs_set_stack_inode_size(dst, (u64)src->st_size);
 461                 if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
 462                         btrfs_set_stack_inode_nbytes(dst, src->st_size);
 463                 else {
 464                         blocks = src->st_size / sectorsize;
 465                         if (src->st_size % sectorsize)
 466                                 blocks += 1;
 467                         blocks *= sectorsize;
 468                         btrfs_set_stack_inode_nbytes(dst, blocks);
 469                 }
 470         }
 471         if (S_ISLNK(src->st_mode))
 472                 btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
 473
 474         return 0;
 475 }
 476
 477 static int directory_select(const struct direct *entry)
 478 {
 479         if ((strncmp(entry->d_name, ".", entry->d_reclen) == 0) ||
 480                 (strncmp(entry->d_name, "..", entry->d_reclen) == 0))
 481                 return 0;
 482         else
 483                 return 1;
 484 }
 485
 486 static void free_namelist(struct direct **files, int count)
 487 {
 488         int i;
 489
 490         if (count < 0)
 491                 return;
 492
 493         for (i = 0; i < count; ++i)
 494                 free(files[i]);
 495         free(files);
 496 }
 497
 498 static u64 calculate_dir_inode_size(char *dirname)
 499 {
 500         int count, i;
 501         struct direct **files, *cur_file;
 502         u64 dir_inode_size = 0;
 503
 504         count = scandir(dirname, &files, directory_select, NULL);
 505
 506         for (i = 0; i < count; i++) {
 507                 cur_file = files[i];
 508                 dir_inode_size += strlen(cur_file->d_name);
 509         }
 510
 511         free_namelist(files, count);
 512
 513         dir_inode_size *= 2;
 514         return dir_inode_size;
 515 }
 516
 517 static int add_inode_items(struct btrfs_trans_handle *trans,
 518                            struct btrfs_root *root,
 519                            struct stat *st, char *name,
 520                            u64 self_objectid, ino_t parent_inum,
 521                            int dir_index_cnt, struct btrfs_inode_item *inode_ret)
 522 {
 523         int ret;
 524         struct btrfs_key inode_key;
 525         struct btrfs_inode_item btrfs_inode;
 526         u64 objectid;
 527         u64 inode_size = 0;
 528         int name_len;
 529
 530         name_len = strlen(name);
 531         fill_inode_item(trans, root, &btrfs_inode, st);
 532         objectid = self_objectid;
 533
 534         if (S_ISDIR(st->st_mode)) {
 535                 inode_size = calculate_dir_inode_size(name);
 536                 btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
 537         }
 538
 539         inode_key.objectid = objectid;
 540         inode_key.offset = 0;
 541         btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
 542
 543         ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 544         if (ret)
 545                 goto fail;
 546
 547         ret = btrfs_insert_inode_ref(trans, root, name, name_len,
 548                                      objectid, parent_inum, dir_index_cnt);
 549         if (ret)
 550                 goto fail;
 551
 552         *inode_ret = btrfs_inode;
 553 fail:
 554         return ret;
 555 }
 556
 557 static int add_xattr_item(struct btrfs_trans_handle *trans,
 558                           struct btrfs_root *root, u64 objectid,
 559                           const char *file_name)
 560 {
 561         int ret;
 562         int cur_name_len;
 563         char xattr_list[XATTR_LIST_MAX];
 564         char *cur_name;
 565         char cur_value[XATTR_SIZE_MAX];
 566         char delimiter = '\0';
 567         char *next_location = xattr_list;
 568
 569         ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
 570         if (ret < 0) {
 571                 if(errno == ENOTSUP)
 572                         return 0;
 573                 fprintf(stderr, "get a list of xattr failed for %s\n",
 574                         file_name);
 575                 return ret;
 576         }
 577         if (ret == 0)
 578                 return ret;
 579
 580         cur_name = strtok(xattr_list, &delimiter);
 581         while (cur_name != NULL) {
 582                 cur_name_len = strlen(cur_name);
 583                 next_location += cur_name_len + 1;
 584
 585                 ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
 586                 if (ret < 0) {
 587                         if(errno == ENOTSUP)
 588                                 return 0;
 589                         fprintf(stderr, "get a xattr value failed for %s attr %s\n",
 590                                 file_name, cur_name);
 591                         return ret;
 592                 }
 593
 594                 ret = btrfs_insert_xattr_item(trans, root, cur_name,
 595                                               cur_name_len, cur_value,
 596                                               ret, objectid);
 597                 if (ret) {
 598                         fprintf(stderr, "insert a xattr item failed for %s\n",
 599                                 file_name);
 600                 }
 601
 602                 cur_name = strtok(next_location, &delimiter);
 603         }
 604
 605         return ret;
 606 }
 607 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
 608                                u64 hint_byte, struct btrfs_key *ins)
 609 {
 610         u64 start;
 611         u64 end;
 612         u64 last = hint_byte;
 613         int ret;
 614         int wrapped = 0;
 615         struct btrfs_block_group_cache *cache;
 616
 617         while (1) {
 618                 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
 619                                             last, &start, &end, EXTENT_DIRTY);
 620                 if (ret) {
 621                         if (wrapped++ == 0) {
 622                                 last = 0;
 623                                 continue;
 624                         } else {
 625                                 goto fail;
 626                         }
 627                 }
 628
 629                 start = max(last, start);
 630                 last = end + 1;
 631                 if (last - start < num_bytes)
 632                         continue;
 633
 634                 last = start + num_bytes;
 635                 if (test_range_bit(&root->fs_info->pinned_extents,
 636                                    start, last - 1, EXTENT_DIRTY, 0))
 637                         continue;
 638
 639                 cache = btrfs_lookup_block_group(root->fs_info, start);
 640                 BUG_ON(!cache);
 641                 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
 642                     last > cache->key.objectid + cache->key.offset) {
 643                         last = cache->key.objectid + cache->key.offset;
 644                         continue;
 645                 }
 646
 647                 if (cache->flags & (BTRFS_BLOCK_GROUP_SYSTEM |
 648                             BTRFS_BLOCK_GROUP_METADATA)) {
 649                         last = cache->key.objectid + cache->key.offset;
 650                         continue;
 651                 }
 652
 653                 clear_extent_dirty(&root->fs_info->free_space_cache,
 654                                    start, start + num_bytes - 1, 0);
 655
 656                 ins->objectid = start;
 657                 ins->offset = num_bytes;
 658                 ins->type = BTRFS_EXTENT_ITEM_KEY;
 659                 return 0;
 660         }
 661 fail:
 662         fprintf(stderr, "not enough free space\n");
 663         return -ENOSPC;
 664 }
 665
 666 static int record_file_extent(struct btrfs_trans_handle *trans,
 667                               struct btrfs_root *root, u64 objectid,
 668                               struct btrfs_inode_item *inode,
 669                               u64 file_pos, u64 disk_bytenr,
 670                               u64 num_bytes)
 671 {
 672         int ret;
 673         struct btrfs_fs_info *info = root->fs_info;
 674         struct btrfs_root *extent_root = info->extent_root;
 675         struct extent_buffer *leaf;
 676         struct btrfs_file_extent_item *fi;
 677         struct btrfs_key ins_key;
 678         struct btrfs_path path;
 679         struct btrfs_extent_item *ei;
 680
 681         btrfs_init_path(&path);
 682
 683         ins_key.objectid = objectid;
 684         ins_key.offset = 0;
 685         btrfs_set_key_type(&ins_key, BTRFS_EXTENT_DATA_KEY);
 686         ret = btrfs_insert_empty_item(trans, root, &path, &ins_key,
 687                                       sizeof(*fi));
 688         if (ret)
 689                 goto fail;
 690         leaf = path.nodes[0];
 691         fi = btrfs_item_ptr(leaf, path.slots[0],
 692                             struct btrfs_file_extent_item);
 693         btrfs_set_file_extent_generation(leaf, fi, trans->transid);
 694         btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
 695         btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
 696         btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
 697         btrfs_set_file_extent_offset(leaf, fi, 0);
 698         btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
 699         btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
 700         btrfs_set_file_extent_compression(leaf, fi, 0);
 701         btrfs_set_file_extent_encryption(leaf, fi, 0);
 702         btrfs_set_file_extent_other_encoding(leaf, fi, 0);
 703         btrfs_mark_buffer_dirty(leaf);
 704
 705         btrfs_release_path(root, &path);
 706
 707         ins_key.objectid = disk_bytenr;
 708         ins_key.offset = num_bytes;
 709         ins_key.type = BTRFS_EXTENT_ITEM_KEY;
 710
 711         ret = btrfs_insert_empty_item(trans, extent_root, &path,
 712                                 &ins_key, sizeof(*ei));
 713         if (ret == 0) {
 714                 leaf = path.nodes[0];
 715                 ei = btrfs_item_ptr(leaf, path.slots[0],
 716                                     struct btrfs_extent_item);
 717
 718                 btrfs_set_extent_refs(leaf, ei, 0);
 719                 btrfs_set_extent_generation(leaf, ei, trans->transid);
 720                 btrfs_set_extent_flags(leaf, ei, BTRFS_EXTENT_FLAG_DATA);
 721
 722                 btrfs_mark_buffer_dirty(leaf);
 723                 ret = btrfs_update_block_group(trans, root, disk_bytenr,
 724                                                num_bytes, 1, 0);
 725                 if (ret)
 726                         goto fail;
 727         } else if (ret != -EEXIST) {
 728                 goto fail;
 729         }
 730
 731         ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, num_bytes, 0,
 732                                    root->root_key.objectid,
 733                                    objectid, 0);
 734 fail:
 735         btrfs_release_path(root, &path);
 736         return ret;
 737 }
 738
 739 static int add_symbolic_link(struct btrfs_trans_handle *trans,
 740                              struct btrfs_root *root,
 741                              u64 objectid, const char *path_name)
 742 {
 743         int ret;
 744         u64 sectorsize = root->sectorsize;
 745         char *buf = malloc(sectorsize);
 746
 747         ret = readlink(path_name, buf, sectorsize);
 748         if (ret <= 0) {
 749                 fprintf(stderr, "readlink failed for %s\n", path_name);
 750                 goto fail;
 751         }
 752         if (ret >= sectorsize) {
 753                 fprintf(stderr, "symlink too long for %s", path_name);
 754                 ret = -1;
 755                 goto fail;
 756         }
 757
 758         buf[ret] = '\0'; /* readlink does not do it for us */
 759         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 760                                          buf, ret + 1);
 761 fail:
 762         free(buf);
 763         return ret;
 764 }
 765
 766 static int add_file_items(struct btrfs_trans_handle *trans,
 767                           struct btrfs_root *root,
 768                           struct btrfs_inode_item *btrfs_inode, u64 objectid,
 769                           ino_t parent_inum, struct stat *st,
 770                           const char *path_name, int out_fd)
 771 {
 772         int ret = -1;
 773         ssize_t ret_read;
 774         u64 bytes_read = 0;
 775         char *buffer = NULL;
 776         struct btrfs_key key;
 777         int blocks;
 778         u32 sectorsize = root->sectorsize;
 779         u64 first_block = 0;
 780         u64 num_blocks = 0;
 781         int fd;
 782
 783         fd = open(path_name, O_RDONLY);
 784         if (fd == -1) {
 785                 fprintf(stderr, "%s open failed\n", path_name);
 786                 return ret;
 787         }
 788
 789         blocks = st->st_size / sectorsize;
 790         if (st->st_size % sectorsize)
 791                 blocks += 1;
 792
 793         if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 794                 buffer = malloc(st->st_size);
 795                 ret_read = pread64(fd, buffer, st->st_size, bytes_read);
 796                 if (ret_read == -1) {
 797                         fprintf(stderr, "%s read failed\n", path_name);
 798                         goto end;
 799                 }
 800
 801                 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 802                                                  buffer, st->st_size);
 803                 goto end;
 804         }
 805
 806         ret = custom_alloc_extent(root, blocks * sectorsize, 0, &key);
 807         if (ret)
 808                 goto end;
 809
 810         first_block = key.objectid;
 811         bytes_read = 0;
 812         buffer = malloc(sectorsize);
 813
 814         do {
 815                 memset(buffer, 0, sectorsize);
 816                 ret_read = pread64(fd, buffer, sectorsize, bytes_read);
 817                 if (ret_read == -1) {
 818                         fprintf(stderr, "%s read failed\n", path_name);
 819                         goto end;
 820                 }
 821
 822                 ret = pwrite64(out_fd, buffer, sectorsize,
 823                                first_block + bytes_read);
 824                 if (ret != sectorsize) {
 825                         fprintf(stderr, "output file write failed\n");
 826                         goto end;
 827                 }
 828
 829                 /* checksum for file data */
 830                 ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
 831                                 first_block + (blocks * sectorsize),
 832                                 first_block + bytes_read,
 833                                 buffer, sectorsize);
 834                 if (ret) {
 835                         fprintf(stderr, "%s checksum failed\n", path_name);
 836                         goto end;
 837                 }
 838
 839                 bytes_read += ret_read;
 840                 num_blocks++;
 841         } while (ret_read == sectorsize);
 842
 843         if (num_blocks > 0) {
 844                 ret = record_file_extent(trans, root, objectid, btrfs_inode,
 845                                          first_block, first_block,
 846                                          blocks * sectorsize);
 847                 if (ret)
 848                         goto end;
 849         }
 850
 851 end:
 852         if (buffer)
 853                 free(buffer);
 854         close(fd);
 855         return ret;
 856 }
 857
 858 static char *make_path(char *dir, char *name)
 859 {
 860         char *path;
 861
 862         path = malloc(strlen(dir) + strlen(name) + 2);
 863         if (!path)
 864                 return NULL;
 865         strcpy(path, dir);
 866         if (dir[strlen(dir) - 1] != '/')
 867                 strcat(path, "/");
 868         strcat(path, name);
 869         return path;
 870 }
 871
 872 static int traverse_directory(struct btrfs_trans_handle *trans,
 873                               struct btrfs_root *root, char *dir_name,
 874                               struct directory_name_entry *dir_head, int out_fd)
 875 {
 876         int ret = 0;
 877
 878         struct btrfs_inode_item cur_inode;
 879         struct btrfs_inode_item *inode_item;
 880         int count, i, dir_index_cnt;
 881         struct direct **files;
 882         struct stat st;
 883         struct directory_name_entry *dir_entry, *parent_dir_entry;
 884         struct direct *cur_file;
 885         ino_t parent_inum, cur_inum;
 886         ino_t highest_inum = 0;
 887         char *parent_dir_name;
 888         struct btrfs_path path;
 889         struct extent_buffer *leaf;
 890         struct btrfs_key root_dir_key;
 891         u64 root_dir_inode_size = 0;
 892
 893         /* Add list for source directory */
 894         dir_entry = malloc(sizeof(struct directory_name_entry));
 895         dir_entry->dir_name = dir_name;
 896         dir_entry->path = strdup(dir_name);
 897
 898         parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
 899         dir_entry->inum = parent_inum;
 900         list_add_tail(&dir_entry->list, &dir_head->list);
 901
 902         btrfs_init_path(&path);
 903
 904         root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
 905         root_dir_key.offset = 0;
 906         btrfs_set_key_type(&root_dir_key, BTRFS_INODE_ITEM_KEY);
 907         ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
 908         if (ret) {
 909                 fprintf(stderr, "root dir lookup error\n");
 910                 return -1;
 911         }
 912
 913         leaf = path.nodes[0];
 914         inode_item = btrfs_item_ptr(leaf, path.slots[0],
 915                                     struct btrfs_inode_item);
 916
 917         root_dir_inode_size = calculate_dir_inode_size(dir_name);
 918         btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
 919         btrfs_mark_buffer_dirty(leaf);
 920
 921         btrfs_release_path(root, &path);
 922
 923         do {
 924                 parent_dir_entry = list_entry(dir_head->list.next,
 925                                               struct directory_name_entry,
 926                                               list);
 927                 list_del(&parent_dir_entry->list);
 928
 929                 parent_inum = parent_dir_entry->inum;
 930                 parent_dir_name = parent_dir_entry->dir_name;
 931                 if (chdir(parent_dir_entry->path)) {
 932                         fprintf(stderr, "chdir error for %s\n",
 933                                 parent_dir_name);
 934                         goto fail_no_files;
 935                 }
 936
 937                 count = scandir(parent_dir_entry->path, &files,
 938                                 directory_select, NULL);
 939                 if (count == -1)
 940                 {
 941                         fprintf(stderr, "scandir for %s failed: %s\n",
 942                                 parent_dir_name, strerror (errno));
 943                         goto fail;
 944                 }
 945
 946                 for (i = 0; i < count; i++) {
 947                         cur_file = files[i];
 948
 949                         if (lstat(cur_file->d_name, &st) == -1) {
 950                                 fprintf(stderr, "lstat failed for file %s\n",
 951                                         cur_file->d_name);
 952                                 goto fail;
 953                         }
 954
 955                         cur_inum = ++highest_inum + BTRFS_FIRST_FREE_OBJECTID;
 956                         ret = add_directory_items(trans, root,
 957                                                   cur_inum, parent_inum,
 958                                                   cur_file->d_name,
 959                                                   &st, &dir_index_cnt);
 960                         if (ret) {
 961                                 fprintf(stderr, "add_directory_items failed\n");
 962                                 goto fail;
 963                         }
 964
 965                         ret = add_inode_items(trans, root, &st,
 966                                               cur_file->d_name, cur_inum,
 967                                               parent_inum, dir_index_cnt,
 968                                               &cur_inode);
 969                         if (ret) {
 970                                 fprintf(stderr, "add_inode_items failed\n");
 971                                 goto fail;
 972                         }
 973
 974                         ret = add_xattr_item(trans, root,
 975                                              cur_inum, cur_file->d_name);
 976                         if (ret) {
 977                                 fprintf(stderr, "add_xattr_item failed\n");
 978                                 if(ret != -ENOTSUP)
 979                                         goto fail;
 980                         }
 981
 982                         if (S_ISDIR(st.st_mode)) {
 983                                 dir_entry = malloc(sizeof(struct directory_name_entry));
 984                                 dir_entry->dir_name = cur_file->d_name;
 985                                 dir_entry->path = make_path(parent_dir_entry->path,
 986                                                             cur_file->d_name);
 987                                 dir_entry->inum = cur_inum;
 988                                 list_add_tail(&dir_entry->list, &dir_head->list);
 989                         } else if (S_ISREG(st.st_mode)) {
 990                                 ret = add_file_items(trans, root, &cur_inode,
 991                                                      cur_inum, parent_inum, &st,
 992                                                      cur_file->d_name, out_fd);
 993                                 if (ret) {
 994                                         fprintf(stderr, "add_file_items failed\n");
 995                                         goto fail;
 996                                 }
 997                         } else if (S_ISLNK(st.st_mode)) {
 998                                 ret = add_symbolic_link(trans, root,
 999                                                         cur_inum, cur_file->d_name);
1000                                 if (ret) {
1001                                         fprintf(stderr, "add_symbolic_link failed\n");
1002                                         goto fail;
1003                                 }
1004                         }
1005                 }
1006
1007                 free_namelist(files, count);
1008                 free(parent_dir_entry->path);
1009                 free(parent_dir_entry);
1010
1011                 index_cnt = 2;
1012
1013         } while (!list_empty(&dir_head->list));
1014
1015         return 0;
1016 fail:
1017         free_namelist(files, count);
1018 fail_no_files:
1019         free(parent_dir_entry->path);
1020         free(parent_dir_entry);
1021         return -1;
1022 }
1023
1024 static int open_target(char *output_name)
1025 {
1026         int output_fd;
1027         output_fd = open(output_name, O_CREAT | O_RDWR | O_TRUNC,
1028                          S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
1029
1030         return output_fd;
1031 }
1032
1033 static int create_chunks(struct btrfs_trans_handle *trans,
1034                          struct btrfs_root *root, u64 num_of_meta_chunks,
1035                          u64 size_of_data)
1036 {
1037         u64 chunk_start;
1038         u64 chunk_size;
1039         u64 meta_type = BTRFS_BLOCK_GROUP_METADATA;
1040         u64 data_type = BTRFS_BLOCK_GROUP_DATA;
1041         u64 minimum_data_chunk_size = 8 * 1024 * 1024;
1042         u64 i;
1043         int ret;
1044
1045         for (i = 0; i < num_of_meta_chunks; i++) {
1046                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
1047                                         &chunk_start, &chunk_size, meta_type);
1048                 BUG_ON(ret);
1049                 ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
1050                                              meta_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
1051                                              chunk_start, chunk_size);
1052                 BUG_ON(ret);
1053                 set_extent_dirty(&root->fs_info->free_space_cache,
1054                                  chunk_start, chunk_start + chunk_size - 1, 0);
1055         }
1056
1057         if (size_of_data < minimum_data_chunk_size)
1058                 size_of_data = minimum_data_chunk_size;
1059         ret = btrfs_alloc_data_chunk(trans, root->fs_info->extent_root,
1060                                      &chunk_start, size_of_data, data_type);
1061         BUG_ON(ret);
1062         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
1063                                      data_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
1064                                      chunk_start, size_of_data);
1065         BUG_ON(ret);
1066         set_extent_dirty(&root->fs_info->free_space_cache,
1067                          chunk_start, chunk_start + size_of_data - 1, 0);
1068         return ret;
1069 }
1070
1071 static int make_image(char *source_dir, struct btrfs_root *root, int out_fd)
1072 {
1073         int ret;
1074         struct btrfs_trans_handle *trans;
1075
1076         struct stat root_st;
1077
1078         struct directory_name_entry dir_head;
1079
1080         ret = lstat(source_dir, &root_st);
1081         if (ret) {
1082                 fprintf(stderr, "unable to lstat the %s\n", source_dir);
1083                 goto fail;
1084         }
1085
1086         INIT_LIST_HEAD(&dir_head.list);
1087
1088         trans = btrfs_start_transaction(root, 1);
1089         ret = traverse_directory(trans, root, source_dir, &dir_head, out_fd);
1090         if (ret) {
1091                 fprintf(stderr, "unable to traverse_directory\n");
1092                 goto fail;
1093         }
1094         btrfs_commit_transaction(trans, root);
1095
1096         printf("Making image is completed.\n");
1097         return 0;
1098 fail:
1099         fprintf(stderr, "Making image is aborted.\n");
1100         return -1;
1101 }
1102
1103 /*
1104  * This ignores symlinks with unreadable targets and subdirs that can't
1105  * be read.  It's a best-effort to give a rough estimate of the size of
1106  * a subdir.  It doesn't guarantee that prepopulating btrfs from this
1107  * tree won't still run out of space.
1108  *
1109  * The rounding up to 4096 is questionable.  Previous code used du -B 4096.
1110  */
1111 static u64 global_total_size;
1112 static int ftw_add_entry_size(const char *fpath, const struct stat *st,
1113                               int type)
1114 {
1115         if (type == FTW_F || type == FTW_D)
1116                 global_total_size += round_up(st->st_size, 4096);
1117
1118         return 0;
1119 }
1120
1121 static u64 size_sourcedir(char *dir_name, u64 sectorsize,
1122                           u64 *num_of_meta_chunks_ret, u64 *size_of_data_ret)
1123 {
1124         u64 dir_size = 0;
1125         u64 total_size = 0;
1126         int ret;
1127         u64 default_chunk_size = 8 * 1024 * 1024;       /* 8MB */
1128         u64 allocated_meta_size = 8 * 1024 * 1024;      /* 8MB */
1129         u64 allocated_total_size = 20 * 1024 * 1024;    /* 20MB */
1130         u64 num_of_meta_chunks = 0;
1131         u64 num_of_allocated_meta_chunks =
1132                         allocated_meta_size / default_chunk_size;
1133
1134         global_total_size = 0;
1135         ret = ftw(dir_name, ftw_add_entry_size, 10);
1136         dir_size = global_total_size;
1137         if (ret < 0) {
1138                 fprintf(stderr, "ftw subdir walk of '%s' failed: %s\n",
1139                         dir_name, strerror(errno));
1140                 exit(1);
1141         }
1142
1143         num_of_meta_chunks = (dir_size / 2) / default_chunk_size;
1144         if (((dir_size / 2) % default_chunk_size) != 0)
1145                 num_of_meta_chunks++;
1146         if (num_of_meta_chunks <= num_of_allocated_meta_chunks)
1147                 num_of_meta_chunks = 0;
1148         else
1149                 num_of_meta_chunks -= num_of_allocated_meta_chunks;
1150
1151         total_size = allocated_total_size + dir_size +
1152                      (num_of_meta_chunks * default_chunk_size);
1153
1154         *num_of_meta_chunks_ret = num_of_meta_chunks;
1155
1156         return total_size;
1157 }
1158
1159 static int zero_output_file(int out_fd, u64 size, u32 sectorsize)
1160 {
1161         int len = sectorsize;
1162         int loop_num = size / sectorsize;
1163         u64 location = 0;
1164         char *buf = malloc(len);
1165         int ret = 0, i;
1166         ssize_t written;
1167
1168         if (!buf)
1169                 return -ENOMEM;
1170         memset(buf, 0, len);
1171         for (i = 0; i < loop_num; i++) {
1172                 written = pwrite64(out_fd, buf, len, location);
1173                 if (written != len)
1174                         ret = -EIO;
1175                 location += sectorsize;
1176         }
1177         free(buf);
1178         return ret;
1179 }
1180
1181 static int check_leaf_or_node_size(u32 size, u32 sectorsize)
1182 {
1183         if (size < sectorsize) {
1184                 fprintf(stderr,
1185                         "Illegal leafsize (or nodesize) %u (smaller than %u)\n",
1186                         size, sectorsize);
1187                 return -1;
1188         } else if (size > BTRFS_MAX_METADATA_BLOCKSIZE) {
1189                 fprintf(stderr,
1190                         "Illegal leafsize (or nodesize) %u (larger than %u)\n",
1191                         size, BTRFS_MAX_METADATA_BLOCKSIZE);
1192                 return -1;
1193         } else if (size & (sectorsize - 1)) {
1194                 fprintf(stderr,
1195                         "Illegal leafsize (or nodesize) %u (not align to %u)\n",
1196                         size, sectorsize);
1197                 return -1;
1198         }
1199         return 0;
1200 }
1201
1202 static int is_ssd(const char *file)
1203 {
1204         blkid_probe probe;
1205         char wholedisk[32];
1206         char sysfs_path[PATH_MAX];
1207         dev_t devno;
1208         int fd;
1209         char rotational;
1210
1211         probe = blkid_new_probe_from_filename(file);
1212         if (!probe)
1213                 return 0;
1214
1215         /* Device number of this disk (possibly a partition) */
1216         devno = blkid_probe_get_devno(probe);
1217         if (!devno)
1218                 return 0;
1219
1220         /* Get whole disk name (not full path) for this devno */
1221         blkid_devno_to_wholedisk(devno, wholedisk, sizeof(wholedisk), NULL);
1222
1223         snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational",
1224                  wholedisk);
1225
1226         blkid_free_probe(probe);
1227
1228         fd = open(sysfs_path, O_RDONLY);
1229         if (fd < 0) {
1230                 return 0;
1231         }
1232
1233         if (read(fd, &rotational, sizeof(char)) < sizeof(char)) {
1234                 close(fd);
1235                 return 0;
1236         }
1237         close(fd);
1238
1239         return !atoi((const char *)&rotational);
1240 }
1241
1242 int main(int ac, char **av)
1243 {
1244         char *file;
1245         struct btrfs_root *root;
1246         struct btrfs_trans_handle *trans;
1247         char *label = NULL;
1248         char *first_file;
1249         u64 block_count = 0;
1250         u64 dev_block_count = 0;
1251         u64 blocks[7];
1252         u64 alloc_start = 0;
1253         u64 metadata_profile = 0;
1254         u64 data_profile = 0;
1255         u32 leafsize = sysconf(_SC_PAGESIZE);
1256         u32 sectorsize = 4096;
1257         u32 nodesize = leafsize;
1258         u32 stripesize = 4096;
1259         int zero_end = 1;
1260         int option_index = 0;
1261         int fd;
1262         int ret;
1263         int i;
1264         int mixed = 0;
1265         int data_profile_opt = 0;
1266         int metadata_profile_opt = 0;
1267         int nodiscard = 0;
1268         int ssd = 0;
1269         int force_overwrite = 0;
1270
1271         char *source_dir = NULL;
1272         int source_dir_set = 0;
1273         u64 num_of_meta_chunks = 0;
1274         u64 size_of_data = 0;
1275         u64 source_dir_size = 0;
1276         char *pretty_buf;
1277         struct btrfs_super_block *super;
1278         u64 flags;
1279         int dev_cnt = 0;
1280         int saved_optind;
1281         char estr[100];
1282
1283         while(1) {
1284                 int c;
1285                 c = getopt_long(ac, av, "A:b:fl:n:s:m:d:L:r:VMK",
1286                                 long_options, &option_index);
1287                 if (c < 0)
1288                         break;
1289                 switch(c) {
1290                         case 'A':
1291                                 alloc_start = parse_size(optarg);
1292                                 break;
1293                         case 'f':
1294                                 force_overwrite = 1;
1295                                 break;
1296                         case 'd':
1297                                 data_profile = parse_profile(optarg);
1298                                 data_profile_opt = 1;
1299                                 break;
1300                         case 'l':
1301                         case 'n':
1302                                 nodesize = parse_size(optarg);
1303                                 leafsize = parse_size(optarg);
1304                                 break;
1305                         case 'L':
1306                                 label = parse_label(optarg);
1307                                 break;
1308                         case 'm':
1309                                 metadata_profile = parse_profile(optarg);
1310                                 metadata_profile_opt = 1;
1311                                 break;
1312                         case 'M':
1313                                 mixed = 1;
1314                                 break;
1315                         case 's':
1316                                 sectorsize = parse_size(optarg);
1317                                 break;
1318                         case 'b':
1319                                 block_count = parse_size(optarg);
1320                                 if (block_count <= 1024*1024*1024) {
1321                                         printf("SMALL VOLUME: forcing mixed "
1322                                                "metadata/data groups\n");
1323                                         mixed = 1;
1324                                 }
1325                                 zero_end = 0;
1326                                 break;
1327                         case 'V':
1328                                 print_version();
1329                                 break;
1330                         case 'r':
1331                                 source_dir = optarg;
1332                                 source_dir_set = 1;
1333                                 break;
1334                         case 'K':
1335                                 nodiscard=1;
1336                                 break;
1337                         default:
1338                                 print_usage();
1339                 }
1340         }
1341         sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));
1342         if (check_leaf_or_node_size(leafsize, sectorsize))
1343                 exit(1);
1344         if (check_leaf_or_node_size(nodesize, sectorsize))
1345                 exit(1);
1346         saved_optind = optind;
1347         dev_cnt = ac - optind;
1348         if (dev_cnt == 0)
1349                 print_usage();
1350
1351         if (source_dir_set && dev_cnt > 1) {
1352                 fprintf(stderr,
1353                         "The -r option is limited to a single device\n");
1354                 exit(1);
1355         }
1356         while (dev_cnt-- > 0) {
1357                 file = av[optind++];
1358                 if (is_block_device(file))
1359                         if (test_dev_for_mkfs(file, force_overwrite, estr)) {
1360                                 fprintf(stderr, "Error: %s", estr);
1361                                 exit(1);
1362                         }
1363         }
1364
1365         /* if we are here that means all devs are good to btrfsify */
1366         optind = saved_optind;
1367         dev_cnt = ac - optind;
1368
1369         printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
1370         printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
1371
1372         file = av[optind++];
1373         dev_cnt--;
1374
1375         if (!source_dir_set) {
1376                 /*
1377                  * open without O_EXCL so that the problem should not
1378                  * occur by the following processing.
1379                  * (btrfs_register_one_device() fails if O_EXCL is on)
1380                  */
1381                 fd = open(file, O_RDWR);
1382                 if (fd < 0) {
1383                         fprintf(stderr, "unable to open %s: %s\n", file,
1384                                 strerror(errno));
1385                         exit(1);
1386                 }
1387                 first_file = file;
1388                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1389                                            block_count, &mixed, nodiscard);
1390                 if (block_count && block_count > dev_block_count) {
1391                         fprintf(stderr, "%s is smaller than requested size\n", file);
1392                         exit(1);
1393                 }
1394         } else {
1395                 fd = open_target(file);
1396                 if (fd < 0) {
1397                         fprintf(stderr, "unable to open the %s\n", file);
1398                         exit(1);
1399                 }
1400
1401                 first_file = file;
1402                 source_dir_size = size_sourcedir(source_dir, sectorsize,
1403                                              &num_of_meta_chunks, &size_of_data);
1404                 if(block_count < source_dir_size)
1405                         block_count = source_dir_size;
1406                 ret = zero_output_file(fd, block_count, sectorsize);
1407                 if (ret) {
1408                         fprintf(stderr, "unable to zero the output file\n");
1409                         exit(1);
1410                 }
1411                 /* our "device" is the new image file */
1412                 dev_block_count = block_count;
1413         }
1414
1415         ssd = is_ssd(file);
1416
1417         if (mixed) {
1418                 if (metadata_profile != data_profile) {
1419                         fprintf(stderr, "With mixed block groups data and metadata "
1420                                 "profiles must be the same\n");
1421                         exit(1);
1422                 }
1423         }
1424
1425         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
1426         for (i = 1; i < 7; i++) {
1427                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
1428                         leafsize * i;
1429         }
1430
1431         ret = make_btrfs(fd, file, label, blocks, dev_block_count,
1432                          nodesize, leafsize,
1433                          sectorsize, stripesize);
1434         if (ret) {
1435                 fprintf(stderr, "error during mkfs %d\n", ret);
1436                 exit(1);
1437         }
1438
1439         root = open_ctree(file, 0, O_RDWR);
1440         if (!root) {
1441                 fprintf(stderr, "Open ctree failed\n");
1442                 close(fd);
1443                 exit(1);
1444         }
1445         root->fs_info->alloc_start = alloc_start;
1446
1447         ret = make_root_dir(root, mixed);
1448         if (ret) {
1449                 fprintf(stderr, "failed to setup the root directory\n");
1450                 exit(1);
1451         }
1452
1453         trans = btrfs_start_transaction(root, 1);
1454
1455         if (dev_cnt == 0)
1456                 goto raid_groups;
1457
1458         btrfs_register_one_device(file);
1459
1460         zero_end = 1;
1461         while (dev_cnt-- > 0) {
1462                 int old_mixed = mixed;
1463
1464                 file = av[optind++];
1465
1466                 /*
1467                  * open without O_EXCL so that the problem should not
1468                  * occur by the following processing.
1469                  * (btrfs_register_one_device() fails if O_EXCL is on)
1470                  */
1471                 fd = open(file, O_RDWR);
1472                 if (fd < 0) {
1473                         fprintf(stderr, "unable to open %s: %s\n", file,
1474                                 strerror(errno));
1475                         exit(1);
1476                 }
1477                 ret = btrfs_device_already_in_root(root, fd,
1478                                                    BTRFS_SUPER_INFO_OFFSET);
1479                 if (ret) {
1480                         fprintf(stderr, "skipping duplicate device %s in FS\n",
1481                                 file);
1482                         close(fd);
1483                         continue;
1484                 }
1485                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1486                                            block_count, &mixed, nodiscard);
1487                 mixed = old_mixed;
1488                 BUG_ON(ret);
1489
1490                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
1491                                         sectorsize, sectorsize, sectorsize);
1492                 BUG_ON(ret);
1493                 btrfs_register_one_device(file);
1494         }
1495
1496 raid_groups:
1497         if (!source_dir_set) {
1498                 ret = create_raid_groups(trans, root, data_profile,
1499                                  data_profile_opt, metadata_profile,
1500                                  metadata_profile_opt, mixed, ssd);
1501                 BUG_ON(ret);
1502         }
1503
1504         ret = create_data_reloc_tree(trans, root);
1505         BUG_ON(ret);
1506
1507         super = root->fs_info->super_copy;
1508         flags = btrfs_super_incompat_flags(super);
1509
1510         if (mixed)
1511                 flags |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
1512
1513         btrfs_set_super_incompat_flags(super, flags);
1514
1515         if ((data_profile | metadata_profile) &
1516             (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
1517                 struct btrfs_super_block *super = root->fs_info->super_copy;
1518                 u64 flags = btrfs_super_incompat_flags(super);
1519
1520                 flags |= BTRFS_FEATURE_INCOMPAT_RAID56;
1521                 btrfs_set_super_incompat_flags(super, flags);
1522                 printf("Setting RAID5/6 feature flag\n");
1523         }
1524
1525         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
1526             "sectorsize %u size %s\n",
1527             label, first_file, nodesize, leafsize, sectorsize,
1528             pretty_buf = pretty_sizes(btrfs_super_total_bytes(root->fs_info->super_copy)));
1529         free(pretty_buf);
1530
1531         printf("%s\n", BTRFS_BUILD_VERSION);
1532         btrfs_commit_transaction(trans, root);
1533
1534         if (source_dir_set) {
1535                 trans = btrfs_start_transaction(root, 1);
1536                 ret = create_chunks(trans, root,
1537                                     num_of_meta_chunks, size_of_data);
1538                 BUG_ON(ret);
1539                 btrfs_commit_transaction(trans, root);
1540
1541                 ret = make_image(source_dir, root, fd);
1542                 BUG_ON(ret);
1543         }
1544
1545         ret = close_ctree(root);
1546         BUG_ON(ret);
1547         free(label);
1548         return 0;
1549 }