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 #include "kerncompat.h"
  20
  21 #include <sys/ioctl.h>
  22 #include <sys/mount.h>
  23 #include "ioctl.h"
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <sys/dir.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <getopt.h>
  32 #include <uuid/uuid.h>
  33 #include <ctype.h>
  34 #include <sys/xattr.h>
  35 #include <limits.h>
  36 #include <linux/limits.h>
  37 #include <blkid/blkid.h>
  38 #include <ftw.h>
  39 #include "ctree.h"
  40 #include "disk-io.h"
  41 #include "volumes.h"
  42 #include "transaction.h"
  43 #include "utils.h"
  44
  45 static u64 index_cnt = 2;
  46
  47 struct directory_name_entry {
  48         char *dir_name;
  49         char *path;
  50         ino_t inum;
  51         struct list_head list;
  52 };
  53
  54 static int make_root_dir(struct btrfs_root *root, int mixed)
  55 {
  56         struct btrfs_trans_handle *trans;
  57         struct btrfs_key location;
  58         u64 bytes_used;
  59         u64 chunk_start = 0;
  60         u64 chunk_size = 0;
  61         int ret;
  62
  63         trans = btrfs_start_transaction(root, 1);
  64         bytes_used = btrfs_super_bytes_used(root->fs_info->super_copy);
  65
  66         root->fs_info->system_allocs = 1;
  67         ret = btrfs_make_block_group(trans, root, bytes_used,
  68                                      BTRFS_BLOCK_GROUP_SYSTEM,
  69                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  70                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  71         BUG_ON(ret);
  72
  73         if (mixed) {
  74                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  75                                         &chunk_start, &chunk_size,
  76                                         BTRFS_BLOCK_GROUP_METADATA |
  77                                         BTRFS_BLOCK_GROUP_DATA);
  78                 if (ret == -ENOSPC) {
  79                         fprintf(stderr,
  80                                 "no space to alloc data/metadata chunk\n");
  81                         goto err;
  82                 }
  83                 BUG_ON(ret);
  84                 ret = btrfs_make_block_group(trans, root, 0,
  85                                              BTRFS_BLOCK_GROUP_METADATA |
  86                                              BTRFS_BLOCK_GROUP_DATA,
  87                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  88                                              chunk_start, chunk_size);
  89                 BUG_ON(ret);
  90                 printf("Created a data/metadata chunk of size %llu\n", chunk_size);
  91         } else {
  92                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  93                                         &chunk_start, &chunk_size,
  94                                         BTRFS_BLOCK_GROUP_METADATA);
  95                 if (ret == -ENOSPC) {
  96                         fprintf(stderr, "no space to alloc metadata chunk\n");
  97                         goto err;
  98                 }
  99                 BUG_ON(ret);
 100                 ret = btrfs_make_block_group(trans, root, 0,
 101                                              BTRFS_BLOCK_GROUP_METADATA,
 102                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 103                                              chunk_start, chunk_size);
 104                 BUG_ON(ret);
 105         }
 106
 107         root->fs_info->system_allocs = 0;
 108         btrfs_commit_transaction(trans, root);
 109         trans = btrfs_start_transaction(root, 1);
 110         BUG_ON(!trans);
 111
 112         if (!mixed) {
 113                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 114                                         &chunk_start, &chunk_size,
 115                                         BTRFS_BLOCK_GROUP_DATA);
 116                 if (ret == -ENOSPC) {
 117                         fprintf(stderr, "no space to alloc data chunk\n");
 118                         goto err;
 119                 }
 120                 BUG_ON(ret);
 121                 ret = btrfs_make_block_group(trans, root, 0,
 122                                              BTRFS_BLOCK_GROUP_DATA,
 123                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 124                                              chunk_start, chunk_size);
 125                 BUG_ON(ret);
 126         }
 127
 128         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 129                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 130         if (ret)
 131                 goto err;
 132         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 133         if (ret)
 134                 goto err;
 135         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 136         location.offset = (u64)-1;
 137         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 138                         "default", 7,
 139                         btrfs_super_root_dir(root->fs_info->super_copy),
 140                         &location, BTRFS_FT_DIR, 0);
 141         if (ret)
 142                 goto err;
 143
 144         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 145                              "default", 7, location.objectid,
 146                              BTRFS_ROOT_TREE_DIR_OBJECTID, 0);
 147         if (ret)
 148                 goto err;
 149
 150         btrfs_commit_transaction(trans, root);
 151 err:
 152         return ret;
 153 }
 154
 155 static void __recow_root(struct btrfs_trans_handle *trans,
 156                          struct btrfs_root *root)
 157 {
 158         int ret;
 159         struct extent_buffer *tmp;
 160
 161         if (trans->transid != btrfs_root_generation(&root->root_item)) {
 162                 extent_buffer_get(root->node);
 163                 ret = __btrfs_cow_block(trans, root, root->node,
 164                                         NULL, 0, &tmp, 0, 0);
 165                 BUG_ON(ret);
 166                 free_extent_buffer(tmp);
 167         }
 168 }
 169
 170 static void recow_roots(struct btrfs_trans_handle *trans,
 171                        struct btrfs_root *root)
 172 {
 173         struct btrfs_fs_info *info = root->fs_info;
 174
 175         __recow_root(trans, info->fs_root);
 176         __recow_root(trans, info->tree_root);
 177         __recow_root(trans, info->extent_root);
 178         __recow_root(trans, info->chunk_root);
 179         __recow_root(trans, info->dev_root);
 180         __recow_root(trans, info->csum_root);
 181 }
 182
 183 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 184                               struct btrfs_root *root, u64 type)
 185 {
 186         u64 chunk_start;
 187         u64 chunk_size;
 188         int ret;
 189
 190         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 191                                 &chunk_start, &chunk_size, type);
 192         if (ret == -ENOSPC) {
 193                 fprintf(stderr, "not enough free space\n");
 194                 exit(1);
 195         }
 196         BUG_ON(ret);
 197         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 198                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 199                                      chunk_start, chunk_size);
 200         BUG_ON(ret);
 201         return ret;
 202 }
 203
 204 static int create_raid_groups(struct btrfs_trans_handle *trans,
 205                               struct btrfs_root *root, u64 data_profile,
 206                               int data_profile_opt, u64 metadata_profile,
 207                               int mixed)
 208 {
 209         u64 num_devices = btrfs_super_num_devices(root->fs_info->super_copy);
 210         int ret;
 211
 212         if (metadata_profile) {
 213                 u64 meta_flags = BTRFS_BLOCK_GROUP_METADATA;
 214
 215                 ret = create_one_raid_group(trans, root,
 216                                             BTRFS_BLOCK_GROUP_SYSTEM |
 217                                             metadata_profile);
 218                 BUG_ON(ret);
 219
 220                 if (mixed)
 221                         meta_flags |= BTRFS_BLOCK_GROUP_DATA;
 222
 223                 ret = create_one_raid_group(trans, root, meta_flags |
 224                                             metadata_profile);
 225                 BUG_ON(ret);
 226
 227         }
 228         if (!mixed && num_devices > 1 && data_profile) {
 229                 ret = create_one_raid_group(trans, root,
 230                                             BTRFS_BLOCK_GROUP_DATA |
 231                                             data_profile);
 232                 BUG_ON(ret);
 233         }
 234         recow_roots(trans, root);
 235
 236         return 0;
 237 }
 238
 239 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 240                                   struct btrfs_root *root)
 241 {
 242         struct btrfs_key location;
 243         struct btrfs_root_item root_item;
 244         struct extent_buffer *tmp;
 245         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 246         int ret;
 247
 248         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 249         BUG_ON(ret);
 250
 251         memcpy(&root_item, &root->root_item, sizeof(root_item));
 252         btrfs_set_root_bytenr(&root_item, tmp->start);
 253         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 254         btrfs_set_root_generation(&root_item, trans->transid);
 255         free_extent_buffer(tmp);
 256
 257         location.objectid = objectid;
 258         location.type = BTRFS_ROOT_ITEM_KEY;
 259         location.offset = 0;
 260         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 261                                 &location, &root_item);
 262         BUG_ON(ret);
 263         return 0;
 264 }
 265
 266
 267 static void print_usage(void) __attribute__((noreturn));
 268 static void print_usage(void)
 269 {
 270         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 271         fprintf(stderr, "options:\n");
 272         fprintf(stderr, "\t-A|--alloc-start START  the offset to start the FS\n");
 273         fprintf(stderr, "\t-b|--byte-count SIZE    total number of bytes in the FS\n");
 274         fprintf(stderr, "\t-d|--data PROFILE       data profile, raid0, raid1, raid5, raid6, raid10, dup or single\n");
 275         fprintf(stderr, "\t-f|--force              force overwrite of existing filesystem\n");
 276         fprintf(stderr, "\t-l|--leafsize SIZE      deprecated, alias for nodesize\n");
 277         fprintf(stderr, "\t-L|--label LABEL        set a label\n");
 278         fprintf(stderr, "\t-m|--metadata PROFILE   metadata profile, values like data profile\n");
 279         fprintf(stderr, "\t-M|--mixed              mix metadata and data together\n");
 280         fprintf(stderr, "\t-n|--nodesize SIZE      size of btree nodes\n");
 281         fprintf(stderr, "\t-s|--sectorsize SIZE    min block allocation (may not mountable by current kernel)\n");
 282         fprintf(stderr, "\t-r|--rootdir DIR        the source directory\n");
 283         fprintf(stderr, "\t-K|--nodiscard          do not perform whole device TRIM\n");
 284         fprintf(stderr, "\t-O|--features LIST      comma separated list of filesystem features, use '-O list-all' to list features\n");
 285         fprintf(stderr, "\t-U|--uuid UUID          specify the filesystem UUID\n");
 286         fprintf(stderr, "\t-V|--version            print the mkfs.btrfs version and exit\n");
 287         fprintf(stderr, "%s\n", PACKAGE_STRING);
 288         exit(1);
 289 }
 290
 291 static void print_version(void) __attribute__((noreturn));
 292 static void print_version(void)
 293 {
 294         fprintf(stderr, "mkfs.btrfs, part of %s\n", PACKAGE_STRING);
 295         exit(0);
 296 }
 297
 298 static u64 parse_profile(char *s)
 299 {
 300         if (strcmp(s, "raid0") == 0) {
 301                 return BTRFS_BLOCK_GROUP_RAID0;
 302         } else if (strcmp(s, "raid1") == 0) {
 303                 return BTRFS_BLOCK_GROUP_RAID1;
 304         } else if (strcmp(s, "raid5") == 0) {
 305                 return BTRFS_BLOCK_GROUP_RAID5;
 306         } else if (strcmp(s, "raid6") == 0) {
 307                 return BTRFS_BLOCK_GROUP_RAID6;
 308         } else if (strcmp(s, "raid10") == 0) {
 309                 return BTRFS_BLOCK_GROUP_RAID10;
 310         } else if (strcmp(s, "dup") == 0) {
 311                 return BTRFS_BLOCK_GROUP_DUP;
 312         } else if (strcmp(s, "single") == 0) {
 313                 return 0;
 314         } else {
 315                 fprintf(stderr, "Unknown profile %s\n", s);
 316                 print_usage();
 317         }
 318         /* not reached */
 319         return 0;
 320 }
 321
 322 static char *parse_label(char *input)
 323 {
 324         int len = strlen(input);
 325
 326         if (len >= BTRFS_LABEL_SIZE) {
 327                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 328                         BTRFS_LABEL_SIZE - 1);
 329                 exit(1);
 330         }
 331         return strdup(input);
 332 }
 333
 334 static int add_directory_items(struct btrfs_trans_handle *trans,
 335                                struct btrfs_root *root, u64 objectid,
 336                                ino_t parent_inum, const char *name,
 337                                struct stat *st, int *dir_index_cnt)
 338 {
 339         int ret;
 340         int name_len;
 341         struct btrfs_key location;
 342         u8 filetype = 0;
 343
 344         name_len = strlen(name);
 345
 346         location.objectid = objectid;
 347         location.offset = 0;
 348         btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
 349
 350         if (S_ISDIR(st->st_mode))
 351                 filetype = BTRFS_FT_DIR;
 352         if (S_ISREG(st->st_mode))
 353                 filetype = BTRFS_FT_REG_FILE;
 354         if (S_ISLNK(st->st_mode))
 355                 filetype = BTRFS_FT_SYMLINK;
 356
 357         ret = btrfs_insert_dir_item(trans, root, name, name_len,
 358                                     parent_inum, &location,
 359                                     filetype, index_cnt);
 360         if (ret)
 361                 return ret;
 362         ret = btrfs_insert_inode_ref(trans, root, name, name_len,
 363                                      objectid, parent_inum, index_cnt);
 364         *dir_index_cnt = index_cnt;
 365         index_cnt++;
 366
 367         return ret;
 368 }
 369
 370 static int fill_inode_item(struct btrfs_trans_handle *trans,
 371                            struct btrfs_root *root,
 372                            struct btrfs_inode_item *dst, struct stat *src)
 373 {
 374         u64 blocks = 0;
 375         u64 sectorsize = root->sectorsize;
 376
 377         /*
 378          * btrfs_inode_item has some reserved fields
 379          * and represents on-disk inode entry, so
 380          * zero everything to prevent information leak
 381          */
 382         memset(dst, 0, sizeof (*dst));
 383
 384         btrfs_set_stack_inode_generation(dst, trans->transid);
 385         btrfs_set_stack_inode_size(dst, src->st_size);
 386         btrfs_set_stack_inode_nbytes(dst, 0);
 387         btrfs_set_stack_inode_block_group(dst, 0);
 388         btrfs_set_stack_inode_nlink(dst, src->st_nlink);
 389         btrfs_set_stack_inode_uid(dst, src->st_uid);
 390         btrfs_set_stack_inode_gid(dst, src->st_gid);
 391         btrfs_set_stack_inode_mode(dst, src->st_mode);
 392         btrfs_set_stack_inode_rdev(dst, 0);
 393         btrfs_set_stack_inode_flags(dst, 0);
 394         btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
 395         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 396         btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
 397         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 398         btrfs_set_stack_timespec_sec(&dst->mtime, src->st_mtime);
 399         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 400         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 401         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 402
 403         if (S_ISDIR(src->st_mode)) {
 404                 btrfs_set_stack_inode_size(dst, 0);
 405                 btrfs_set_stack_inode_nlink(dst, 1);
 406         }
 407         if (S_ISREG(src->st_mode)) {
 408                 btrfs_set_stack_inode_size(dst, (u64)src->st_size);
 409                 if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
 410                         btrfs_set_stack_inode_nbytes(dst, src->st_size);
 411                 else {
 412                         blocks = src->st_size / sectorsize;
 413                         if (src->st_size % sectorsize)
 414                                 blocks += 1;
 415                         blocks *= sectorsize;
 416                         btrfs_set_stack_inode_nbytes(dst, blocks);
 417                 }
 418         }
 419         if (S_ISLNK(src->st_mode))
 420                 btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
 421
 422         return 0;
 423 }
 424
 425 static int directory_select(const struct direct *entry)
 426 {
 427         if ((strncmp(entry->d_name, ".", entry->d_reclen) == 0) ||
 428                 (strncmp(entry->d_name, "..", entry->d_reclen) == 0))
 429                 return 0;
 430         else
 431                 return 1;
 432 }
 433
 434 static void free_namelist(struct direct **files, int count)
 435 {
 436         int i;
 437
 438         if (count < 0)
 439                 return;
 440
 441         for (i = 0; i < count; ++i)
 442                 free(files[i]);
 443         free(files);
 444 }
 445
 446 static u64 calculate_dir_inode_size(char *dirname)
 447 {
 448         int count, i;
 449         struct direct **files, *cur_file;
 450         u64 dir_inode_size = 0;
 451
 452         count = scandir(dirname, &files, directory_select, NULL);
 453
 454         for (i = 0; i < count; i++) {
 455                 cur_file = files[i];
 456                 dir_inode_size += strlen(cur_file->d_name);
 457         }
 458
 459         free_namelist(files, count);
 460
 461         dir_inode_size *= 2;
 462         return dir_inode_size;
 463 }
 464
 465 static int add_inode_items(struct btrfs_trans_handle *trans,
 466                            struct btrfs_root *root,
 467                            struct stat *st, char *name,
 468                            u64 self_objectid, ino_t parent_inum,
 469                            int dir_index_cnt, struct btrfs_inode_item *inode_ret)
 470 {
 471         int ret;
 472         struct btrfs_key inode_key;
 473         struct btrfs_inode_item btrfs_inode;
 474         u64 objectid;
 475         u64 inode_size = 0;
 476
 477         fill_inode_item(trans, root, &btrfs_inode, st);
 478         objectid = self_objectid;
 479
 480         if (S_ISDIR(st->st_mode)) {
 481                 inode_size = calculate_dir_inode_size(name);
 482                 btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
 483         }
 484
 485         inode_key.objectid = objectid;
 486         inode_key.offset = 0;
 487         btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
 488
 489         ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 490
 491         *inode_ret = btrfs_inode;
 492         return ret;
 493 }
 494
 495 static int add_xattr_item(struct btrfs_trans_handle *trans,
 496                           struct btrfs_root *root, u64 objectid,
 497                           const char *file_name)
 498 {
 499         int ret;
 500         int cur_name_len;
 501         char xattr_list[XATTR_LIST_MAX];
 502         char *cur_name;
 503         char cur_value[XATTR_SIZE_MAX];
 504         char delimiter = '\0';
 505         char *next_location = xattr_list;
 506
 507         ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
 508         if (ret < 0) {
 509                 if(errno == ENOTSUP)
 510                         return 0;
 511                 fprintf(stderr, "get a list of xattr failed for %s\n",
 512                         file_name);
 513                 return ret;
 514         }
 515         if (ret == 0)
 516                 return ret;
 517
 518         cur_name = strtok(xattr_list, &delimiter);
 519         while (cur_name != NULL) {
 520                 cur_name_len = strlen(cur_name);
 521                 next_location += cur_name_len + 1;
 522
 523                 ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
 524                 if (ret < 0) {
 525                         if(errno == ENOTSUP)
 526                                 return 0;
 527                         fprintf(stderr, "get a xattr value failed for %s attr %s\n",
 528                                 file_name, cur_name);
 529                         return ret;
 530                 }
 531
 532                 ret = btrfs_insert_xattr_item(trans, root, cur_name,
 533                                               cur_name_len, cur_value,
 534                                               ret, objectid);
 535                 if (ret) {
 536                         fprintf(stderr, "insert a xattr item failed for %s\n",
 537                                 file_name);
 538                 }
 539
 540                 cur_name = strtok(next_location, &delimiter);
 541         }
 542
 543         return ret;
 544 }
 545
 546 static int add_symbolic_link(struct btrfs_trans_handle *trans,
 547                              struct btrfs_root *root,
 548                              u64 objectid, const char *path_name)
 549 {
 550         int ret;
 551         u64 sectorsize = root->sectorsize;
 552         char *buf = malloc(sectorsize);
 553
 554         ret = readlink(path_name, buf, sectorsize);
 555         if (ret <= 0) {
 556                 fprintf(stderr, "readlink failed for %s\n", path_name);
 557                 goto fail;
 558         }
 559         if (ret >= sectorsize) {
 560                 fprintf(stderr, "symlink too long for %s", path_name);
 561                 ret = -1;
 562                 goto fail;
 563         }
 564
 565         buf[ret] = '\0'; /* readlink does not do it for us */
 566         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 567                                          buf, ret + 1);
 568 fail:
 569         free(buf);
 570         return ret;
 571 }
 572
 573 static int add_file_items(struct btrfs_trans_handle *trans,
 574                           struct btrfs_root *root,
 575                           struct btrfs_inode_item *btrfs_inode, u64 objectid,
 576                           ino_t parent_inum, struct stat *st,
 577                           const char *path_name, int out_fd)
 578 {
 579         int ret = -1;
 580         ssize_t ret_read;
 581         u64 bytes_read = 0;
 582         struct btrfs_key key;
 583         int blocks;
 584         u32 sectorsize = root->sectorsize;
 585         u64 first_block = 0;
 586         u64 file_pos = 0;
 587         u64 cur_bytes;
 588         u64 total_bytes;
 589         struct extent_buffer *eb = NULL;
 590         int fd;
 591
 592         if (st->st_size == 0)
 593                 return 0;
 594
 595         fd = open(path_name, O_RDONLY);
 596         if (fd == -1) {
 597                 fprintf(stderr, "%s open failed\n", path_name);
 598                 return ret;
 599         }
 600
 601         blocks = st->st_size / sectorsize;
 602         if (st->st_size % sectorsize)
 603                 blocks += 1;
 604
 605         if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 606                 char *buffer = malloc(st->st_size);
 607                 ret_read = pread64(fd, buffer, st->st_size, bytes_read);
 608                 if (ret_read == -1) {
 609                         fprintf(stderr, "%s read failed\n", path_name);
 610                         free(buffer);
 611                         goto end;
 612                 }
 613
 614                 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 615                                                  buffer, st->st_size);
 616                 free(buffer);
 617                 goto end;
 618         }
 619
 620         /* round up our st_size to the FS blocksize */
 621         total_bytes = (u64)blocks * sectorsize;
 622
 623         /*
 624          * do our IO in extent buffers so it can work
 625          * against any raid type
 626          */
 627         eb = malloc(sizeof(*eb) + sectorsize);
 628         if (!eb) {
 629                 ret = -ENOMEM;
 630                 goto end;
 631         }
 632         memset(eb, 0, sizeof(*eb) + sectorsize);
 633
 634 again:
 635
 636         /*
 637          * keep our extent size at 1MB max, this makes it easier to work inside
 638          * the tiny block groups created during mkfs
 639          */
 640         cur_bytes = min(total_bytes, 1024ULL * 1024);
 641         ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
 642                                    &key, 1);
 643         if (ret)
 644                 goto end;
 645
 646         first_block = key.objectid;
 647         bytes_read = 0;
 648
 649         while (bytes_read < cur_bytes) {
 650
 651                 memset(eb->data, 0, sectorsize);
 652
 653                 ret_read = pread64(fd, eb->data, sectorsize, file_pos + bytes_read);
 654                 if (ret_read == -1) {
 655                         fprintf(stderr, "%s read failed\n", path_name);
 656                         goto end;
 657                 }
 658
 659                 eb->start = first_block + bytes_read;
 660                 eb->len = sectorsize;
 661
 662                 /*
 663                  * we're doing the csum before we record the extent, but
 664                  * that's ok
 665                  */
 666                 ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
 667                                             first_block + bytes_read + sectorsize,
 668                                             first_block + bytes_read,
 669                                             eb->data, sectorsize);
 670                 if (ret)
 671                         goto end;
 672
 673                 ret = write_and_map_eb(trans, root, eb);
 674                 if (ret) {
 675                         fprintf(stderr, "output file write failed\n");
 676                         goto end;
 677                 }
 678
 679                 bytes_read += sectorsize;
 680         }
 681
 682         if (bytes_read) {
 683                 ret = btrfs_record_file_extent(trans, root, objectid, btrfs_inode,
 684                                                file_pos, first_block, cur_bytes);
 685                 if (ret)
 686                         goto end;
 687
 688         }
 689
 690         file_pos += cur_bytes;
 691         total_bytes -= cur_bytes;
 692
 693         if (total_bytes)
 694                 goto again;
 695
 696 end:
 697         free(eb);
 698         close(fd);
 699         return ret;
 700 }
 701
 702 static char *make_path(char *dir, char *name)
 703 {
 704         char *path;
 705
 706         path = malloc(strlen(dir) + strlen(name) + 2);
 707         if (!path)
 708                 return NULL;
 709         strcpy(path, dir);
 710         if (dir[strlen(dir) - 1] != '/')
 711                 strcat(path, "/");
 712         strcat(path, name);
 713         return path;
 714 }
 715
 716 static int traverse_directory(struct btrfs_trans_handle *trans,
 717                               struct btrfs_root *root, char *dir_name,
 718                               struct directory_name_entry *dir_head, int out_fd)
 719 {
 720         int ret = 0;
 721
 722         struct btrfs_inode_item cur_inode;
 723         struct btrfs_inode_item *inode_item;
 724         int count, i, dir_index_cnt;
 725         struct direct **files;
 726         struct stat st;
 727         struct directory_name_entry *dir_entry, *parent_dir_entry;
 728         struct direct *cur_file;
 729         ino_t parent_inum, cur_inum;
 730         ino_t highest_inum = 0;
 731         char *parent_dir_name;
 732         char real_path[PATH_MAX];
 733         struct btrfs_path path;
 734         struct extent_buffer *leaf;
 735         struct btrfs_key root_dir_key;
 736         u64 root_dir_inode_size = 0;
 737
 738         /* Add list for source directory */
 739         dir_entry = malloc(sizeof(struct directory_name_entry));
 740         dir_entry->dir_name = dir_name;
 741         dir_entry->path = realpath(dir_name, real_path);
 742         if (!dir_entry->path) {
 743                 fprintf(stderr, "get directory real path error\n");
 744                 ret = -1;
 745                 goto fail_no_dir;
 746         }
 747
 748         parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
 749         dir_entry->inum = parent_inum;
 750         list_add_tail(&dir_entry->list, &dir_head->list);
 751
 752         btrfs_init_path(&path);
 753
 754         root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
 755         root_dir_key.offset = 0;
 756         btrfs_set_key_type(&root_dir_key, BTRFS_INODE_ITEM_KEY);
 757         ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
 758         if (ret) {
 759                 fprintf(stderr, "root dir lookup error\n");
 760                 goto fail_no_dir;
 761         }
 762
 763         leaf = path.nodes[0];
 764         inode_item = btrfs_item_ptr(leaf, path.slots[0],
 765                                     struct btrfs_inode_item);
 766
 767         root_dir_inode_size = calculate_dir_inode_size(dir_name);
 768         btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
 769         btrfs_mark_buffer_dirty(leaf);
 770
 771         btrfs_release_path(&path);
 772
 773         do {
 774                 parent_dir_entry = list_entry(dir_head->list.next,
 775                                               struct directory_name_entry,
 776                                               list);
 777                 list_del(&parent_dir_entry->list);
 778
 779                 parent_inum = parent_dir_entry->inum;
 780                 parent_dir_name = parent_dir_entry->dir_name;
 781                 if (chdir(parent_dir_entry->path)) {
 782                         fprintf(stderr, "chdir error for %s\n",
 783                                 parent_dir_name);
 784                         ret = -1;
 785                         goto fail_no_files;
 786                 }
 787
 788                 count = scandir(parent_dir_entry->path, &files,
 789                                 directory_select, NULL);
 790                 if (count == -1)
 791                 {
 792                         fprintf(stderr, "scandir for %s failed: %s\n",
 793                                 parent_dir_name, strerror (errno));
 794                         ret = -1;
 795                         goto fail;
 796                 }
 797
 798                 for (i = 0; i < count; i++) {
 799                         cur_file = files[i];
 800
 801                         if (lstat(cur_file->d_name, &st) == -1) {
 802                                 fprintf(stderr, "lstat failed for file %s\n",
 803                                         cur_file->d_name);
 804                                 ret = -1;
 805                                 goto fail;
 806                         }
 807
 808                         cur_inum = st.st_ino;
 809                         ret = add_directory_items(trans, root,
 810                                                   cur_inum, parent_inum,
 811                                                   cur_file->d_name,
 812                                                   &st, &dir_index_cnt);
 813                         if (ret) {
 814                                 fprintf(stderr, "add_directory_items failed\n");
 815                                 goto fail;
 816                         }
 817
 818                         ret = add_inode_items(trans, root, &st,
 819                                               cur_file->d_name, cur_inum,
 820                                               parent_inum, dir_index_cnt,
 821                                               &cur_inode);
 822                         if (ret == -EEXIST) {
 823                                 BUG_ON(st.st_nlink <= 1);
 824                                 continue;
 825                         }
 826                         if (ret) {
 827                                 fprintf(stderr, "add_inode_items failed\n");
 828                                 goto fail;
 829                         }
 830
 831                         ret = add_xattr_item(trans, root,
 832                                              cur_inum, cur_file->d_name);
 833                         if (ret) {
 834                                 fprintf(stderr, "add_xattr_item failed\n");
 835                                 if(ret != -ENOTSUP)
 836                                         goto fail;
 837                         }
 838
 839                         if (S_ISDIR(st.st_mode)) {
 840                                 dir_entry = malloc(sizeof(struct directory_name_entry));
 841                                 dir_entry->dir_name = cur_file->d_name;
 842                                 dir_entry->path = make_path(parent_dir_entry->path,
 843                                                             cur_file->d_name);
 844                                 dir_entry->inum = cur_inum;
 845                                 list_add_tail(&dir_entry->list, &dir_head->list);
 846                         } else if (S_ISREG(st.st_mode)) {
 847                                 ret = add_file_items(trans, root, &cur_inode,
 848                                                      cur_inum, parent_inum, &st,
 849                                                      cur_file->d_name, out_fd);
 850                                 if (ret) {
 851                                         fprintf(stderr, "add_file_items failed\n");
 852                                         goto fail;
 853                                 }
 854                         } else if (S_ISLNK(st.st_mode)) {
 855                                 ret = add_symbolic_link(trans, root,
 856                                                         cur_inum, cur_file->d_name);
 857                                 if (ret) {
 858                                         fprintf(stderr, "add_symbolic_link failed\n");
 859                                         goto fail;
 860                                 }
 861                         }
 862                 }
 863
 864                 free_namelist(files, count);
 865                 free(parent_dir_entry);
 866
 867                 index_cnt = 2;
 868
 869         } while (!list_empty(&dir_head->list));
 870
 871 out:
 872         return !!ret;
 873 fail:
 874         free_namelist(files, count);
 875 fail_no_files:
 876         free(parent_dir_entry);
 877         goto out;
 878 fail_no_dir:
 879         free(dir_entry);
 880         goto out;
 881 }
 882
 883 static int open_target(char *output_name)
 884 {
 885         int output_fd;
 886         output_fd = open(output_name, O_CREAT | O_RDWR | O_TRUNC,
 887                          S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
 888
 889         return output_fd;
 890 }
 891
 892 static int create_chunks(struct btrfs_trans_handle *trans,
 893                          struct btrfs_root *root, u64 num_of_meta_chunks,
 894                          u64 size_of_data)
 895 {
 896         u64 chunk_start;
 897         u64 chunk_size;
 898         u64 meta_type = BTRFS_BLOCK_GROUP_METADATA;
 899         u64 data_type = BTRFS_BLOCK_GROUP_DATA;
 900         u64 minimum_data_chunk_size = 8 * 1024 * 1024;
 901         u64 i;
 902         int ret;
 903
 904         for (i = 0; i < num_of_meta_chunks; i++) {
 905                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 906                                         &chunk_start, &chunk_size, meta_type);
 907                 BUG_ON(ret);
 908                 ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 909                                              meta_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 910                                              chunk_start, chunk_size);
 911                 BUG_ON(ret);
 912                 set_extent_dirty(&root->fs_info->free_space_cache,
 913                                  chunk_start, chunk_start + chunk_size - 1, 0);
 914         }
 915
 916         if (size_of_data < minimum_data_chunk_size)
 917                 size_of_data = minimum_data_chunk_size;
 918
 919         ret = btrfs_alloc_data_chunk(trans, root->fs_info->extent_root,
 920                                      &chunk_start, size_of_data, data_type);
 921         BUG_ON(ret);
 922         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 923                                      data_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 924                                      chunk_start, size_of_data);
 925         BUG_ON(ret);
 926         set_extent_dirty(&root->fs_info->free_space_cache,
 927                          chunk_start, chunk_start + size_of_data - 1, 0);
 928         return ret;
 929 }
 930
 931 static int make_image(char *source_dir, struct btrfs_root *root, int out_fd)
 932 {
 933         int ret;
 934         struct btrfs_trans_handle *trans;
 935
 936         struct stat root_st;
 937
 938         struct directory_name_entry dir_head;
 939
 940         struct directory_name_entry *dir_entry = NULL;
 941
 942         ret = lstat(source_dir, &root_st);
 943         if (ret) {
 944                 fprintf(stderr, "unable to lstat the %s\n", source_dir);
 945                 goto out;
 946         }
 947
 948         INIT_LIST_HEAD(&dir_head.list);
 949
 950         trans = btrfs_start_transaction(root, 1);
 951         ret = traverse_directory(trans, root, source_dir, &dir_head, out_fd);
 952         if (ret) {
 953                 fprintf(stderr, "unable to traverse_directory\n");
 954                 goto fail;
 955         }
 956         btrfs_commit_transaction(trans, root);
 957
 958         printf("Making image is completed.\n");
 959         return 0;
 960 fail:
 961         while (!list_empty(&dir_head.list)) {
 962                 dir_entry = list_entry(dir_head.list.next,
 963                                        struct directory_name_entry, list);
 964                 list_del(&dir_entry->list);
 965                 free(dir_entry);
 966         }
 967 out:
 968         fprintf(stderr, "Making image is aborted.\n");
 969         return -1;
 970 }
 971
 972 /*
 973  * This ignores symlinks with unreadable targets and subdirs that can't
 974  * be read.  It's a best-effort to give a rough estimate of the size of
 975  * a subdir.  It doesn't guarantee that prepopulating btrfs from this
 976  * tree won't still run out of space.
 977  *
 978  * The rounding up to 4096 is questionable.  Previous code used du -B 4096.
 979  */
 980 static u64 global_total_size;
 981 static int ftw_add_entry_size(const char *fpath, const struct stat *st,
 982                               int type)
 983 {
 984         if (type == FTW_F || type == FTW_D)
 985                 global_total_size += round_up(st->st_size, 4096);
 986
 987         return 0;
 988 }
 989
 990 static u64 size_sourcedir(char *dir_name, u64 sectorsize,
 991                           u64 *num_of_meta_chunks_ret, u64 *size_of_data_ret)
 992 {
 993         u64 dir_size = 0;
 994         u64 total_size = 0;
 995         int ret;
 996         u64 default_chunk_size = 8 * 1024 * 1024;       /* 8MB */
 997         u64 allocated_meta_size = 8 * 1024 * 1024;      /* 8MB */
 998         u64 allocated_total_size = 20 * 1024 * 1024;    /* 20MB */
 999         u64 num_of_meta_chunks = 0;
1000         u64 num_of_data_chunks = 0;
1001         u64 num_of_allocated_meta_chunks =
1002                         allocated_meta_size / default_chunk_size;
1003
1004         global_total_size = 0;
1005         ret = ftw(dir_name, ftw_add_entry_size, 10);
1006         dir_size = global_total_size;
1007         if (ret < 0) {
1008                 fprintf(stderr, "ftw subdir walk of '%s' failed: %s\n",
1009                         dir_name, strerror(errno));
1010                 exit(1);
1011         }
1012
1013         num_of_data_chunks = (dir_size + default_chunk_size - 1) /
1014                 default_chunk_size;
1015
1016         num_of_meta_chunks = (dir_size / 2) / default_chunk_size;
1017         if (((dir_size / 2) % default_chunk_size) != 0)
1018                 num_of_meta_chunks++;
1019         if (num_of_meta_chunks <= num_of_allocated_meta_chunks)
1020                 num_of_meta_chunks = 0;
1021         else
1022                 num_of_meta_chunks -= num_of_allocated_meta_chunks;
1023
1024         total_size = allocated_total_size +
1025                      (num_of_data_chunks * default_chunk_size) +
1026                      (num_of_meta_chunks * default_chunk_size);
1027
1028         *num_of_meta_chunks_ret = num_of_meta_chunks;
1029         *size_of_data_ret = num_of_data_chunks * default_chunk_size;
1030         return total_size;
1031 }
1032
1033 static int zero_output_file(int out_fd, u64 size, u32 sectorsize)
1034 {
1035         int len = sectorsize;
1036         int loop_num = size / sectorsize;
1037         u64 location = 0;
1038         char *buf = malloc(len);
1039         int ret = 0, i;
1040         ssize_t written;
1041
1042         if (!buf)
1043                 return -ENOMEM;
1044         memset(buf, 0, len);
1045         for (i = 0; i < loop_num; i++) {
1046                 written = pwrite64(out_fd, buf, len, location);
1047                 if (written != len)
1048                         ret = -EIO;
1049                 location += sectorsize;
1050         }
1051         free(buf);
1052         return ret;
1053 }
1054
1055 static int is_ssd(const char *file)
1056 {
1057         blkid_probe probe;
1058         char wholedisk[32];
1059         char sysfs_path[PATH_MAX];
1060         dev_t devno;
1061         int fd;
1062         char rotational;
1063         int ret;
1064
1065         probe = blkid_new_probe_from_filename(file);
1066         if (!probe)
1067                 return 0;
1068
1069         /* Device number of this disk (possibly a partition) */
1070         devno = blkid_probe_get_devno(probe);
1071         if (!devno) {
1072                 blkid_free_probe(probe);
1073                 return 0;
1074         }
1075
1076         /* Get whole disk name (not full path) for this devno */
1077         ret = blkid_devno_to_wholedisk(devno,
1078                         wholedisk, sizeof(wholedisk), NULL);
1079         if (ret) {
1080                 blkid_free_probe(probe);
1081                 return 0;
1082         }
1083
1084         snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational",
1085                  wholedisk);
1086
1087         blkid_free_probe(probe);
1088
1089         fd = open(sysfs_path, O_RDONLY);
1090         if (fd < 0) {
1091                 return 0;
1092         }
1093
1094         if (read(fd, &rotational, sizeof(char)) < sizeof(char)) {
1095                 close(fd);
1096                 return 0;
1097         }
1098         close(fd);
1099
1100         return !atoi((const char *)&rotational);
1101 }
1102
1103 int main(int ac, char **av)
1104 {
1105         char *file;
1106         struct btrfs_root *root;
1107         struct btrfs_trans_handle *trans;
1108         char *label = NULL;
1109         char *first_file;
1110         u64 block_count = 0;
1111         u64 dev_block_count = 0;
1112         u64 blocks[7];
1113         u64 alloc_start = 0;
1114         u64 metadata_profile = 0;
1115         u64 data_profile = 0;
1116         u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
1117                         BTRFS_MKFS_DEFAULT_NODE_SIZE);
1118         u32 sectorsize = 4096;
1119         u32 stripesize = 4096;
1120         int zero_end = 1;
1121         int fd;
1122         int ret;
1123         int i;
1124         int mixed = 0;
1125         int nodesize_forced = 0;
1126         int data_profile_opt = 0;
1127         int metadata_profile_opt = 0;
1128         int discard = 1;
1129         int ssd = 0;
1130         int force_overwrite = 0;
1131
1132         char *source_dir = NULL;
1133         int source_dir_set = 0;
1134         u64 num_of_meta_chunks = 0;
1135         u64 size_of_data = 0;
1136         u64 source_dir_size = 0;
1137         int dev_cnt = 0;
1138         int saved_optind;
1139         char estr[100];
1140         char *fs_uuid = NULL;
1141         u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
1142
1143         while(1) {
1144                 int c;
1145                 static const struct option long_options[] = {
1146                         { "alloc-start", required_argument, NULL, 'A'},
1147                         { "byte-count", required_argument, NULL, 'b' },
1148                         { "force", no_argument, NULL, 'f' },
1149                         { "leafsize", required_argument, NULL, 'l' },
1150                         { "label", required_argument, NULL, 'L'},
1151                         { "metadata", required_argument, NULL, 'm' },
1152                         { "mixed", no_argument, NULL, 'M' },
1153                         { "nodesize", required_argument, NULL, 'n' },
1154                         { "sectorsize", required_argument, NULL, 's' },
1155                         { "data", required_argument, NULL, 'd' },
1156                         { "version", no_argument, NULL, 'V' },
1157                         { "rootdir", required_argument, NULL, 'r' },
1158                         { "nodiscard", no_argument, NULL, 'K' },
1159                         { "features", required_argument, NULL, 'O' },
1160                         { "uuid", required_argument, NULL, 'U' },
1161                         { NULL, 0, NULL, 0}
1162                 };
1163
1164                 c = getopt_long(ac, av, "A:b:fl:n:s:m:d:L:O:r:U:VMK",
1165                                 long_options, NULL);
1166                 if (c < 0)
1167                         break;
1168                 switch(c) {
1169                         case 'A':
1170                                 alloc_start = parse_size(optarg);
1171                                 break;
1172                         case 'f':
1173                                 force_overwrite = 1;
1174                                 break;
1175                         case 'd':
1176                                 data_profile = parse_profile(optarg);
1177                                 data_profile_opt = 1;
1178                                 break;
1179                         case 'l':
1180                                 fprintf(stderr,
1181                         "WARNING: --leafsize is deprecated, use --nodesize\n");
1182                         case 'n':
1183                                 nodesize = parse_size(optarg);
1184                                 nodesize_forced = 1;
1185                                 break;
1186                         case 'L':
1187                                 label = parse_label(optarg);
1188                                 break;
1189                         case 'm':
1190                                 metadata_profile = parse_profile(optarg);
1191                                 metadata_profile_opt = 1;
1192                                 break;
1193                         case 'M':
1194                                 mixed = 1;
1195                                 break;
1196                         case 'O': {
1197                                 char *orig = strdup(optarg);
1198                                 char *tmp = orig;
1199
1200                                 tmp = btrfs_parse_fs_features(tmp, &features);
1201                                 if (tmp) {
1202                                         fprintf(stderr,
1203                                                 "Unrecognized filesystem feature '%s'\n",
1204                                                         tmp);
1205                                         free(orig);
1206                                         exit(1);
1207                                 }
1208                                 free(orig);
1209                                 if (features & BTRFS_FEATURE_LIST_ALL) {
1210                                         btrfs_list_all_fs_features(0);
1211                                         exit(0);
1212                                 }
1213                                 break;
1214                                 }
1215                         case 's':
1216                                 sectorsize = parse_size(optarg);
1217                                 break;
1218                         case 'b':
1219                                 block_count = parse_size(optarg);
1220                                 if (block_count <= BTRFS_MKFS_SMALL_VOLUME_SIZE) {
1221                                         fprintf(stdout,
1222                                 "SMALL VOLUME: forcing mixed metadata/data groups\n");
1223                                         mixed = 1;
1224                                 }
1225                                 zero_end = 0;
1226                                 break;
1227                         case 'V':
1228                                 print_version();
1229                                 break;
1230                         case 'r':
1231                                 source_dir = optarg;
1232                                 source_dir_set = 1;
1233                                 break;
1234                         case 'U':
1235                                 fs_uuid = optarg;
1236                                 break;
1237                         case 'K':
1238                                 discard = 0;
1239                                 break;
1240                         default:
1241                                 print_usage();
1242                 }
1243         }
1244         sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));
1245         if (btrfs_check_nodesize(nodesize, sectorsize))
1246                 exit(1);
1247         saved_optind = optind;
1248         dev_cnt = ac - optind;
1249         if (dev_cnt == 0)
1250                 print_usage();
1251
1252         if (source_dir_set && dev_cnt > 1) {
1253                 fprintf(stderr,
1254                         "The -r option is limited to a single device\n");
1255                 exit(1);
1256         }
1257
1258         if (fs_uuid) {
1259                 uuid_t dummy_uuid;
1260
1261                 if (uuid_parse(fs_uuid, dummy_uuid) != 0) {
1262                         fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
1263                         exit(1);
1264                 }
1265                 if (!test_uuid_unique(fs_uuid)) {
1266                         fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
1267                         exit(1);
1268                 }
1269         }
1270
1271         while (dev_cnt-- > 0) {
1272                 file = av[optind++];
1273                 if (is_block_device(file))
1274                         if (test_dev_for_mkfs(file, force_overwrite, estr)) {
1275                                 fprintf(stderr, "Error: %s", estr);
1276                                 exit(1);
1277                         }
1278         }
1279
1280         optind = saved_optind;
1281         dev_cnt = ac - optind;
1282
1283         file = av[optind++];
1284         ssd = is_ssd(file);
1285
1286         if (is_vol_small(file)) {
1287                 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
1288                 mixed = 1;
1289         }
1290
1291         /*
1292         * Set default profiles according to number of added devices.
1293         * For mixed groups defaults are single/single.
1294         */
1295         if (!mixed) {
1296                 if (!metadata_profile_opt) {
1297                         if (dev_cnt == 1 && ssd)
1298                                 printf("Detected a SSD, turning off metadata "
1299                                 "duplication.  Mkfs with -m dup if you want to "
1300                                 "force metadata duplication.\n");
1301
1302                         metadata_profile = (dev_cnt > 1) ?
1303                                         BTRFS_BLOCK_GROUP_RAID1 : (ssd) ?
1304                                         0: BTRFS_BLOCK_GROUP_DUP;
1305                 }
1306                 if (!data_profile_opt) {
1307                         data_profile = (dev_cnt > 1) ?
1308                                 BTRFS_BLOCK_GROUP_RAID0 : 0; /* raid0 or single */
1309                 }
1310         } else {
1311                 u32 best_nodesize = max_t(u32, sysconf(_SC_PAGESIZE), sectorsize);
1312
1313                 if (metadata_profile_opt || data_profile_opt) {
1314                         if (metadata_profile != data_profile) {
1315                                 fprintf(stderr,
1316         "ERROR: With mixed block groups data and metadata profiles must be the same\n");
1317                                 exit(1);
1318                         }
1319                 }
1320
1321                 if (!nodesize_forced) {
1322                         nodesize = best_nodesize;
1323                         if (btrfs_check_nodesize(nodesize, sectorsize))
1324                                 exit(1);
1325                 }
1326                 if (nodesize != sectorsize) {
1327                         fprintf(stderr, "Error: mixed metadata/data block groups "
1328                                 "require metadata blocksizes equal to the sectorsize\n");
1329                         exit(1);
1330                 }
1331         }
1332
1333         /* Check device/block_count after the nodesize is determined */
1334         if (block_count && block_count < btrfs_min_dev_size(nodesize)) {
1335                 fprintf(stderr,
1336                         "Size '%llu' is too small to make a usable filesystem\n",
1337                         block_count);
1338                 fprintf(stderr,
1339                         "Minimum size for btrfs filesystem is %llu\n",
1340                         btrfs_min_dev_size(nodesize));
1341                 exit(1);
1342         }
1343         for (i = saved_optind; i < saved_optind + dev_cnt; i++) {
1344                 char *path;
1345
1346                 path = av[i];
1347                 ret = test_minimum_size(path, nodesize);
1348                 if (ret < 0) {
1349                         fprintf(stderr, "Failed to check size for '%s': %s\n",
1350                                 path, strerror(-ret));
1351                         exit (1);
1352                 }
1353                 if (ret > 0) {
1354                         fprintf(stderr,
1355                                 "'%s' is too small to make a usable filesystem\n",
1356                                 path);
1357                         fprintf(stderr,
1358                                 "Minimum size for each btrfs device is %llu.\n",
1359                                 btrfs_min_dev_size(nodesize));
1360                         exit(1);
1361                 }
1362         }
1363         ret = test_num_disk_vs_raid(metadata_profile, data_profile,
1364                         dev_cnt, mixed, estr);
1365         if (ret) {
1366                 fprintf(stderr, "Error: %s\n", estr);
1367                 exit(1);
1368         }
1369
1370         /* if we are here that means all devs are good to btrfsify */
1371         printf("%s\n", PACKAGE_STRING);
1372         printf("See %s for more information.\n\n", PACKAGE_URL);
1373
1374         dev_cnt--;
1375
1376         if (!source_dir_set) {
1377                 /*
1378                  * open without O_EXCL so that the problem should not
1379                  * occur by the following processing.
1380                  * (btrfs_register_one_device() fails if O_EXCL is on)
1381                  */
1382                 fd = open(file, O_RDWR);
1383                 if (fd < 0) {
1384                         fprintf(stderr, "unable to open %s: %s\n", file,
1385                                 strerror(errno));
1386                         exit(1);
1387                 }
1388                 first_file = file;
1389                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1390                                            block_count, &mixed, discard);
1391                 if (ret) {
1392                         close(fd);
1393                         exit(1);
1394                 }
1395                 if (block_count && block_count > dev_block_count) {
1396                         fprintf(stderr, "%s is smaller than requested size\n", file);
1397                         exit(1);
1398                 }
1399         } else {
1400                 fd = open_target(file);
1401                 if (fd < 0) {
1402                         fprintf(stderr, "unable to open the %s\n", file);
1403                         exit(1);
1404                 }
1405
1406                 first_file = file;
1407                 source_dir_size = size_sourcedir(source_dir, sectorsize,
1408                                              &num_of_meta_chunks, &size_of_data);
1409                 if(block_count < source_dir_size)
1410                         block_count = source_dir_size;
1411                 ret = zero_output_file(fd, block_count, sectorsize);
1412                 if (ret) {
1413                         fprintf(stderr, "unable to zero the output file\n");
1414                         exit(1);
1415                 }
1416                 /* our "device" is the new image file */
1417                 dev_block_count = block_count;
1418         }
1419
1420         /* To create the first block group and chunk 0 in make_btrfs */
1421         if (dev_block_count < BTRFS_MKFS_SYSTEM_GROUP_SIZE) {
1422                 fprintf(stderr, "device is too small to make filesystem\n");
1423                 exit(1);
1424         }
1425
1426         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
1427         for (i = 1; i < 7; i++) {
1428                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
1429                         nodesize * i;
1430         }
1431
1432         if (group_profile_max_safe_loss(metadata_profile) <
1433                 group_profile_max_safe_loss(data_profile)){
1434                 fprintf(stderr,
1435                         "WARNING: metatdata has lower redundancy than data!\n\n");
1436         }
1437
1438         /*
1439          * FS features that can be set by other means than -O
1440          * just set the bit here
1441          */
1442         if (mixed)
1443                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
1444
1445         if ((data_profile | metadata_profile) &
1446             (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
1447                 features |= BTRFS_FEATURE_INCOMPAT_RAID56;
1448         }
1449
1450         btrfs_process_fs_features(features);
1451
1452         ret = make_btrfs(fd, file, label, fs_uuid, blocks, dev_block_count,
1453                          nodesize, sectorsize, stripesize, features);
1454         if (ret) {
1455                 fprintf(stderr, "error during mkfs: %s\n", strerror(-ret));
1456                 exit(1);
1457         }
1458
1459         root = open_ctree(file, 0, OPEN_CTREE_WRITES);
1460         if (!root) {
1461                 fprintf(stderr, "Open ctree failed\n");
1462                 close(fd);
1463                 exit(1);
1464         }
1465         root->fs_info->alloc_start = alloc_start;
1466
1467         ret = make_root_dir(root, mixed);
1468         if (ret) {
1469                 fprintf(stderr, "failed to setup the root directory\n");
1470                 exit(1);
1471         }
1472
1473         trans = btrfs_start_transaction(root, 1);
1474
1475         btrfs_register_one_device(file);
1476
1477         if (dev_cnt == 0)
1478                 goto raid_groups;
1479
1480         while (dev_cnt-- > 0) {
1481                 int old_mixed = mixed;
1482
1483                 file = av[optind++];
1484
1485                 /*
1486                  * open without O_EXCL so that the problem should not
1487                  * occur by the following processing.
1488                  * (btrfs_register_one_device() fails if O_EXCL is on)
1489                  */
1490                 fd = open(file, O_RDWR);
1491                 if (fd < 0) {
1492                         fprintf(stderr, "unable to open %s: %s\n", file,
1493                                 strerror(errno));
1494                         exit(1);
1495                 }
1496                 ret = btrfs_device_already_in_root(root, fd,
1497                                                    BTRFS_SUPER_INFO_OFFSET);
1498                 if (ret) {
1499                         fprintf(stderr, "skipping duplicate device %s in FS\n",
1500                                 file);
1501                         close(fd);
1502                         continue;
1503                 }
1504                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1505                                            block_count, &mixed, discard);
1506                 if (ret) {
1507                         close(fd);
1508                         exit(1);
1509                 }
1510                 mixed = old_mixed;
1511
1512                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
1513                                         sectorsize, sectorsize, sectorsize);
1514                 BUG_ON(ret);
1515                 btrfs_register_one_device(file);
1516         }
1517
1518 raid_groups:
1519         if (!source_dir_set) {
1520                 ret = create_raid_groups(trans, root, data_profile,
1521                                  data_profile_opt, metadata_profile,
1522                                  mixed);
1523                 BUG_ON(ret);
1524         }
1525
1526         ret = create_data_reloc_tree(trans, root);
1527         BUG_ON(ret);
1528
1529         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
1530             "sectorsize %u size %s\n",
1531             label, first_file, nodesize, nodesize, sectorsize,
1532             pretty_size(btrfs_super_total_bytes(root->fs_info->super_copy)));
1533
1534         btrfs_commit_transaction(trans, root);
1535
1536         if (source_dir_set) {
1537                 trans = btrfs_start_transaction(root, 1);
1538                 ret = create_chunks(trans, root,
1539                                     num_of_meta_chunks, size_of_data);
1540                 BUG_ON(ret);
1541                 btrfs_commit_transaction(trans, root);
1542
1543                 ret = make_image(source_dir, root, fd);
1544                 BUG_ON(ret);
1545         }
1546
1547         ret = close_ctree(root);
1548         BUG_ON(ret);
1549         free(label);
1550         return 0;
1551 }