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 #include <sys/ioctl.h>
  25 #include <sys/mount.h>
  26 #include "ioctl.h"
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <sys/dir.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <getopt.h>
  35 #include <uuid/uuid.h>
  36 #include <ctype.h>
  37 #include <sys/xattr.h>
  38 #include <blkid/blkid.h>
  39 #include <ftw.h>
  40 #include "ctree.h"
  41 #include "disk-io.h"
  42 #include "volumes.h"
  43 #include "transaction.h"
  44 #include "utils.h"
  45 #include "version.h"
  46
  47 static u64 index_cnt = 2;
  48
  49 #define DEFAULT_MKFS_FEATURES   (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
  50
  51 #define DEFAULT_MKFS_LEAF_SIZE 16384
  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                 if (ret == -ENOSPC) {
  85                         fprintf(stderr,
  86                                 "no space to alloc data/metadata chunk\n");
  87                         goto err;
  88                 }
  89                 BUG_ON(ret);
  90                 ret = btrfs_make_block_group(trans, root, 0,
  91                                              BTRFS_BLOCK_GROUP_METADATA |
  92                                              BTRFS_BLOCK_GROUP_DATA,
  93                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  94                                              chunk_start, chunk_size);
  95                 BUG_ON(ret);
  96                 printf("Created a data/metadata chunk of size %llu\n", chunk_size);
  97         } else {
  98                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  99                                         &chunk_start, &chunk_size,
 100                                         BTRFS_BLOCK_GROUP_METADATA);
 101                 if (ret == -ENOSPC) {
 102                         fprintf(stderr, "no space to alloc metadata chunk\n");
 103                         goto err;
 104                 }
 105                 BUG_ON(ret);
 106                 ret = btrfs_make_block_group(trans, root, 0,
 107                                              BTRFS_BLOCK_GROUP_METADATA,
 108                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 109                                              chunk_start, chunk_size);
 110                 BUG_ON(ret);
 111         }
 112
 113         root->fs_info->system_allocs = 0;
 114         btrfs_commit_transaction(trans, root);
 115         trans = btrfs_start_transaction(root, 1);
 116         BUG_ON(!trans);
 117
 118         if (!mixed) {
 119                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 120                                         &chunk_start, &chunk_size,
 121                                         BTRFS_BLOCK_GROUP_DATA);
 122                 if (ret == -ENOSPC) {
 123                         fprintf(stderr, "no space to alloc data chunk\n");
 124                         goto err;
 125                 }
 126                 BUG_ON(ret);
 127                 ret = btrfs_make_block_group(trans, root, 0,
 128                                              BTRFS_BLOCK_GROUP_DATA,
 129                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 130                                              chunk_start, chunk_size);
 131                 BUG_ON(ret);
 132         }
 133
 134         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 135                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 136         if (ret)
 137                 goto err;
 138         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 139         if (ret)
 140                 goto err;
 141         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 142         location.offset = (u64)-1;
 143         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 144                         "default", 7,
 145                         btrfs_super_root_dir(root->fs_info->super_copy),
 146                         &location, BTRFS_FT_DIR, 0);
 147         if (ret)
 148                 goto err;
 149
 150         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 151                              "default", 7, location.objectid,
 152                              BTRFS_ROOT_TREE_DIR_OBJECTID, 0);
 153         if (ret)
 154                 goto err;
 155
 156         btrfs_commit_transaction(trans, root);
 157 err:
 158         return ret;
 159 }
 160
 161 static void __recow_root(struct btrfs_trans_handle *trans,
 162                          struct btrfs_root *root)
 163 {
 164         int ret;
 165         struct extent_buffer *tmp;
 166
 167         if (trans->transid != btrfs_root_generation(&root->root_item)) {
 168                 extent_buffer_get(root->node);
 169                 ret = __btrfs_cow_block(trans, root, root->node,
 170                                         NULL, 0, &tmp, 0, 0);
 171                 BUG_ON(ret);
 172                 free_extent_buffer(tmp);
 173         }
 174 }
 175
 176 static void recow_roots(struct btrfs_trans_handle *trans,
 177                        struct btrfs_root *root)
 178 {
 179         struct btrfs_fs_info *info = root->fs_info;
 180
 181         __recow_root(trans, info->fs_root);
 182         __recow_root(trans, info->tree_root);
 183         __recow_root(trans, info->extent_root);
 184         __recow_root(trans, info->chunk_root);
 185         __recow_root(trans, info->dev_root);
 186         __recow_root(trans, info->csum_root);
 187 }
 188
 189 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 190                               struct btrfs_root *root, u64 type)
 191 {
 192         u64 chunk_start;
 193         u64 chunk_size;
 194         int ret;
 195
 196         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 197                                 &chunk_start, &chunk_size, type);
 198         if (ret == -ENOSPC) {
 199                 fprintf(stderr, "not enough free space\n");
 200                 exit(1);
 201         }
 202         BUG_ON(ret);
 203         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 204                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 205                                      chunk_start, chunk_size);
 206         BUG_ON(ret);
 207         return ret;
 208 }
 209
 210 static int create_raid_groups(struct btrfs_trans_handle *trans,
 211                               struct btrfs_root *root, u64 data_profile,
 212                               int data_profile_opt, u64 metadata_profile,
 213                               int mixed)
 214 {
 215         u64 num_devices = btrfs_super_num_devices(root->fs_info->super_copy);
 216         int ret;
 217
 218         if (metadata_profile) {
 219                 u64 meta_flags = BTRFS_BLOCK_GROUP_METADATA;
 220
 221                 ret = create_one_raid_group(trans, root,
 222                                             BTRFS_BLOCK_GROUP_SYSTEM |
 223                                             metadata_profile);
 224                 BUG_ON(ret);
 225
 226                 if (mixed)
 227                         meta_flags |= BTRFS_BLOCK_GROUP_DATA;
 228
 229                 ret = create_one_raid_group(trans, root, meta_flags |
 230                                             metadata_profile);
 231                 BUG_ON(ret);
 232
 233         }
 234         if (!mixed && num_devices > 1 && data_profile) {
 235                 ret = create_one_raid_group(trans, root,
 236                                             BTRFS_BLOCK_GROUP_DATA |
 237                                             data_profile);
 238                 BUG_ON(ret);
 239         }
 240         recow_roots(trans, root);
 241
 242         return 0;
 243 }
 244
 245 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 246                                   struct btrfs_root *root)
 247 {
 248         struct btrfs_key location;
 249         struct btrfs_root_item root_item;
 250         struct extent_buffer *tmp;
 251         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 252         int ret;
 253
 254         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 255         BUG_ON(ret);
 256
 257         memcpy(&root_item, &root->root_item, sizeof(root_item));
 258         btrfs_set_root_bytenr(&root_item, tmp->start);
 259         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 260         btrfs_set_root_generation(&root_item, trans->transid);
 261         free_extent_buffer(tmp);
 262
 263         location.objectid = objectid;
 264         location.type = BTRFS_ROOT_ITEM_KEY;
 265         location.offset = 0;
 266         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 267                                 &location, &root_item);
 268         BUG_ON(ret);
 269         return 0;
 270 }
 271
 272
 273 static void print_usage(void) __attribute__((noreturn));
 274 static void print_usage(void)
 275 {
 276         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 277         fprintf(stderr, "options:\n");
 278         fprintf(stderr, "\t -A --alloc-start the offset to start the FS\n");
 279         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 280         fprintf(stderr, "\t -d --data data profile, raid0, raid1, raid5, raid6, raid10, dup or single\n");
 281         fprintf(stderr, "\t -f --force force overwrite of existing filesystem\n");
 282         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 283         fprintf(stderr, "\t -L --label set a label\n");
 284         fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
 285         fprintf(stderr, "\t -M --mixed mix metadata and data together\n");
 286         fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
 287         fprintf(stderr, "\t -s --sectorsize min block allocation (may not mountable by current kernel)\n");
 288         fprintf(stderr, "\t -r --rootdir the source directory\n");
 289         fprintf(stderr, "\t -K --nodiscard do not perform whole device TRIM\n");
 290         fprintf(stderr, "\t -O --features comma separated list of filesystem features\n");
 291         fprintf(stderr, "\t -U --uuid specify the filesystem UUID\n");
 292         fprintf(stderr, "\t -V --version print the mkfs.btrfs version and exit\n");
 293         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
 294         exit(1);
 295 }
 296
 297 static void print_version(void) __attribute__((noreturn));
 298 static void print_version(void)
 299 {
 300         fprintf(stderr, "mkfs.btrfs, part of %s\n", BTRFS_BUILD_VERSION);
 301         exit(0);
 302 }
 303
 304 static u64 parse_profile(char *s)
 305 {
 306         if (strcmp(s, "raid0") == 0) {
 307                 return BTRFS_BLOCK_GROUP_RAID0;
 308         } else if (strcmp(s, "raid1") == 0) {
 309                 return BTRFS_BLOCK_GROUP_RAID1;
 310         } else if (strcmp(s, "raid5") == 0) {
 311                 return BTRFS_BLOCK_GROUP_RAID5;
 312         } else if (strcmp(s, "raid6") == 0) {
 313                 return BTRFS_BLOCK_GROUP_RAID6;
 314         } else if (strcmp(s, "raid10") == 0) {
 315                 return BTRFS_BLOCK_GROUP_RAID10;
 316         } else if (strcmp(s, "dup") == 0) {
 317                 return BTRFS_BLOCK_GROUP_DUP;
 318         } else if (strcmp(s, "single") == 0) {
 319                 return 0;
 320         } else {
 321                 fprintf(stderr, "Unknown profile %s\n", s);
 322                 print_usage();
 323         }
 324         /* not reached */
 325         return 0;
 326 }
 327
 328 static char *parse_label(char *input)
 329 {
 330         int len = strlen(input);
 331
 332         if (len >= BTRFS_LABEL_SIZE) {
 333                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 334                         BTRFS_LABEL_SIZE - 1);
 335                 exit(1);
 336         }
 337         return strdup(input);
 338 }
 339
 340 static struct option long_options[] = {
 341         { "alloc-start", 1, NULL, 'A'},
 342         { "byte-count", 1, NULL, 'b' },
 343         { "force", 0, NULL, 'f' },
 344         { "leafsize", 1, NULL, 'l' },
 345         { "label", 1, NULL, 'L'},
 346         { "metadata", 1, NULL, 'm' },
 347         { "mixed", 0, NULL, 'M' },
 348         { "nodesize", 1, NULL, 'n' },
 349         { "sectorsize", 1, NULL, 's' },
 350         { "data", 1, NULL, 'd' },
 351         { "version", 0, NULL, 'V' },
 352         { "rootdir", 1, NULL, 'r' },
 353         { "nodiscard", 0, NULL, 'K' },
 354         { "features", 1, NULL, 'O' },
 355         { "uuid", 0, NULL, 'U' },
 356         { NULL, 0, NULL, 0}
 357 };
 358
 359 static int add_directory_items(struct btrfs_trans_handle *trans,
 360                                struct btrfs_root *root, u64 objectid,
 361                                ino_t parent_inum, const char *name,
 362                                struct stat *st, int *dir_index_cnt)
 363 {
 364         int ret;
 365         int name_len;
 366         struct btrfs_key location;
 367         u8 filetype = 0;
 368
 369         name_len = strlen(name);
 370
 371         location.objectid = objectid;
 372         location.offset = 0;
 373         btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
 374
 375         if (S_ISDIR(st->st_mode))
 376                 filetype = BTRFS_FT_DIR;
 377         if (S_ISREG(st->st_mode))
 378                 filetype = BTRFS_FT_REG_FILE;
 379         if (S_ISLNK(st->st_mode))
 380                 filetype = BTRFS_FT_SYMLINK;
 381
 382         ret = btrfs_insert_dir_item(trans, root, name, name_len,
 383                                     parent_inum, &location,
 384                                     filetype, index_cnt);
 385         if (ret)
 386                 return ret;
 387         ret = btrfs_insert_inode_ref(trans, root, name, name_len,
 388                                      objectid, parent_inum, index_cnt);
 389         *dir_index_cnt = index_cnt;
 390         index_cnt++;
 391
 392         return ret;
 393 }
 394
 395 static int fill_inode_item(struct btrfs_trans_handle *trans,
 396                            struct btrfs_root *root,
 397                            struct btrfs_inode_item *dst, struct stat *src)
 398 {
 399         u64 blocks = 0;
 400         u64 sectorsize = root->sectorsize;
 401
 402         /*
 403          * btrfs_inode_item has some reserved fields
 404          * and represents on-disk inode entry, so
 405          * zero everything to prevent information leak
 406          */
 407         memset(dst, 0, sizeof (*dst));
 408
 409         btrfs_set_stack_inode_generation(dst, trans->transid);
 410         btrfs_set_stack_inode_size(dst, src->st_size);
 411         btrfs_set_stack_inode_nbytes(dst, 0);
 412         btrfs_set_stack_inode_block_group(dst, 0);
 413         btrfs_set_stack_inode_nlink(dst, src->st_nlink);
 414         btrfs_set_stack_inode_uid(dst, src->st_uid);
 415         btrfs_set_stack_inode_gid(dst, src->st_gid);
 416         btrfs_set_stack_inode_mode(dst, src->st_mode);
 417         btrfs_set_stack_inode_rdev(dst, 0);
 418         btrfs_set_stack_inode_flags(dst, 0);
 419         btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
 420         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 421         btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
 422         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 423         btrfs_set_stack_timespec_sec(&dst->mtime, src->st_mtime);
 424         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 425         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 426         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 427
 428         if (S_ISDIR(src->st_mode)) {
 429                 btrfs_set_stack_inode_size(dst, 0);
 430                 btrfs_set_stack_inode_nlink(dst, 1);
 431         }
 432         if (S_ISREG(src->st_mode)) {
 433                 btrfs_set_stack_inode_size(dst, (u64)src->st_size);
 434                 if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
 435                         btrfs_set_stack_inode_nbytes(dst, src->st_size);
 436                 else {
 437                         blocks = src->st_size / sectorsize;
 438                         if (src->st_size % sectorsize)
 439                                 blocks += 1;
 440                         blocks *= sectorsize;
 441                         btrfs_set_stack_inode_nbytes(dst, blocks);
 442                 }
 443         }
 444         if (S_ISLNK(src->st_mode))
 445                 btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
 446
 447         return 0;
 448 }
 449
 450 static int directory_select(const struct direct *entry)
 451 {
 452         if ((strncmp(entry->d_name, ".", entry->d_reclen) == 0) ||
 453                 (strncmp(entry->d_name, "..", entry->d_reclen) == 0))
 454                 return 0;
 455         else
 456                 return 1;
 457 }
 458
 459 static void free_namelist(struct direct **files, int count)
 460 {
 461         int i;
 462
 463         if (count < 0)
 464                 return;
 465
 466         for (i = 0; i < count; ++i)
 467                 free(files[i]);
 468         free(files);
 469 }
 470
 471 static u64 calculate_dir_inode_size(char *dirname)
 472 {
 473         int count, i;
 474         struct direct **files, *cur_file;
 475         u64 dir_inode_size = 0;
 476
 477         count = scandir(dirname, &files, directory_select, NULL);
 478
 479         for (i = 0; i < count; i++) {
 480                 cur_file = files[i];
 481                 dir_inode_size += strlen(cur_file->d_name);
 482         }
 483
 484         free_namelist(files, count);
 485
 486         dir_inode_size *= 2;
 487         return dir_inode_size;
 488 }
 489
 490 static int add_inode_items(struct btrfs_trans_handle *trans,
 491                            struct btrfs_root *root,
 492                            struct stat *st, char *name,
 493                            u64 self_objectid, ino_t parent_inum,
 494                            int dir_index_cnt, struct btrfs_inode_item *inode_ret)
 495 {
 496         int ret;
 497         struct btrfs_key inode_key;
 498         struct btrfs_inode_item btrfs_inode;
 499         u64 objectid;
 500         u64 inode_size = 0;
 501
 502         fill_inode_item(trans, root, &btrfs_inode, st);
 503         objectid = self_objectid;
 504
 505         if (S_ISDIR(st->st_mode)) {
 506                 inode_size = calculate_dir_inode_size(name);
 507                 btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
 508         }
 509
 510         inode_key.objectid = objectid;
 511         inode_key.offset = 0;
 512         btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
 513
 514         ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 515
 516         *inode_ret = btrfs_inode;
 517         return ret;
 518 }
 519
 520 static int add_xattr_item(struct btrfs_trans_handle *trans,
 521                           struct btrfs_root *root, u64 objectid,
 522                           const char *file_name)
 523 {
 524         int ret;
 525         int cur_name_len;
 526         char xattr_list[XATTR_LIST_MAX];
 527         char *cur_name;
 528         char cur_value[XATTR_SIZE_MAX];
 529         char delimiter = '\0';
 530         char *next_location = xattr_list;
 531
 532         ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
 533         if (ret < 0) {
 534                 if(errno == ENOTSUP)
 535                         return 0;
 536                 fprintf(stderr, "get a list of xattr failed for %s\n",
 537                         file_name);
 538                 return ret;
 539         }
 540         if (ret == 0)
 541                 return ret;
 542
 543         cur_name = strtok(xattr_list, &delimiter);
 544         while (cur_name != NULL) {
 545                 cur_name_len = strlen(cur_name);
 546                 next_location += cur_name_len + 1;
 547
 548                 ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
 549                 if (ret < 0) {
 550                         if(errno == ENOTSUP)
 551                                 return 0;
 552                         fprintf(stderr, "get a xattr value failed for %s attr %s\n",
 553                                 file_name, cur_name);
 554                         return ret;
 555                 }
 556
 557                 ret = btrfs_insert_xattr_item(trans, root, cur_name,
 558                                               cur_name_len, cur_value,
 559                                               ret, objectid);
 560                 if (ret) {
 561                         fprintf(stderr, "insert a xattr item failed for %s\n",
 562                                 file_name);
 563                 }
 564
 565                 cur_name = strtok(next_location, &delimiter);
 566         }
 567
 568         return ret;
 569 }
 570
 571 static int add_symbolic_link(struct btrfs_trans_handle *trans,
 572                              struct btrfs_root *root,
 573                              u64 objectid, const char *path_name)
 574 {
 575         int ret;
 576         u64 sectorsize = root->sectorsize;
 577         char *buf = malloc(sectorsize);
 578
 579         ret = readlink(path_name, buf, sectorsize);
 580         if (ret <= 0) {
 581                 fprintf(stderr, "readlink failed for %s\n", path_name);
 582                 goto fail;
 583         }
 584         if (ret >= sectorsize) {
 585                 fprintf(stderr, "symlink too long for %s", path_name);
 586                 ret = -1;
 587                 goto fail;
 588         }
 589
 590         buf[ret] = '\0'; /* readlink does not do it for us */
 591         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 592                                          buf, ret + 1);
 593 fail:
 594         free(buf);
 595         return ret;
 596 }
 597
 598 static int add_file_items(struct btrfs_trans_handle *trans,
 599                           struct btrfs_root *root,
 600                           struct btrfs_inode_item *btrfs_inode, u64 objectid,
 601                           ino_t parent_inum, struct stat *st,
 602                           const char *path_name, int out_fd)
 603 {
 604         int ret = -1;
 605         ssize_t ret_read;
 606         u64 bytes_read = 0;
 607         struct btrfs_key key;
 608         int blocks;
 609         u32 sectorsize = root->sectorsize;
 610         u64 first_block = 0;
 611         u64 file_pos = 0;
 612         u64 cur_bytes;
 613         u64 total_bytes;
 614         struct extent_buffer *eb = NULL;
 615         int fd;
 616
 617         if (st->st_size == 0)
 618                 return 0;
 619
 620         fd = open(path_name, O_RDONLY);
 621         if (fd == -1) {
 622                 fprintf(stderr, "%s open failed\n", path_name);
 623                 return ret;
 624         }
 625
 626         blocks = st->st_size / sectorsize;
 627         if (st->st_size % sectorsize)
 628                 blocks += 1;
 629
 630         if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 631                 char *buffer = malloc(st->st_size);
 632                 ret_read = pread64(fd, buffer, st->st_size, bytes_read);
 633                 if (ret_read == -1) {
 634                         fprintf(stderr, "%s read failed\n", path_name);
 635                         free(buffer);
 636                         goto end;
 637                 }
 638
 639                 ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 640                                                  buffer, st->st_size);
 641                 free(buffer);
 642                 goto end;
 643         }
 644
 645         /* round up our st_size to the FS blocksize */
 646         total_bytes = (u64)blocks * sectorsize;
 647
 648         /*
 649          * do our IO in extent buffers so it can work
 650          * against any raid type
 651          */
 652         eb = malloc(sizeof(*eb) + sectorsize);
 653         if (!eb) {
 654                 ret = -ENOMEM;
 655                 goto end;
 656         }
 657         memset(eb, 0, sizeof(*eb) + sectorsize);
 658
 659 again:
 660
 661         /*
 662          * keep our extent size at 1MB max, this makes it easier to work inside
 663          * the tiny block groups created during mkfs
 664          */
 665         cur_bytes = min(total_bytes, 1024ULL * 1024);
 666         ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
 667                                    &key, 1);
 668         if (ret)
 669                 goto end;
 670
 671         first_block = key.objectid;
 672         bytes_read = 0;
 673
 674         while (bytes_read < cur_bytes) {
 675
 676                 memset(eb->data, 0, sectorsize);
 677
 678                 ret_read = pread64(fd, eb->data, sectorsize, file_pos + bytes_read);
 679                 if (ret_read == -1) {
 680                         fprintf(stderr, "%s read failed\n", path_name);
 681                         goto end;
 682                 }
 683
 684                 eb->start = first_block + bytes_read;
 685                 eb->len = sectorsize;
 686
 687                 /*
 688                  * we're doing the csum before we record the extent, but
 689                  * that's ok
 690                  */
 691                 ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
 692                                             first_block + bytes_read + sectorsize,
 693                                             first_block + bytes_read,
 694                                             eb->data, sectorsize);
 695                 if (ret)
 696                         goto end;
 697
 698                 ret = write_and_map_eb(trans, root, eb);
 699                 if (ret) {
 700                         fprintf(stderr, "output file write failed\n");
 701                         goto end;
 702                 }
 703
 704                 bytes_read += sectorsize;
 705         }
 706
 707         if (bytes_read) {
 708                 ret = btrfs_record_file_extent(trans, root, objectid, btrfs_inode,
 709                                                file_pos, first_block, cur_bytes);
 710                 if (ret)
 711                         goto end;
 712
 713         }
 714
 715         file_pos += cur_bytes;
 716         total_bytes -= cur_bytes;
 717
 718         if (total_bytes)
 719                 goto again;
 720
 721 end:
 722         free(eb);
 723         close(fd);
 724         return ret;
 725 }
 726
 727 static char *make_path(char *dir, char *name)
 728 {
 729         char *path;
 730
 731         path = malloc(strlen(dir) + strlen(name) + 2);
 732         if (!path)
 733                 return NULL;
 734         strcpy(path, dir);
 735         if (dir[strlen(dir) - 1] != '/')
 736                 strcat(path, "/");
 737         strcat(path, name);
 738         return path;
 739 }
 740
 741 static int traverse_directory(struct btrfs_trans_handle *trans,
 742                               struct btrfs_root *root, char *dir_name,
 743                               struct directory_name_entry *dir_head, int out_fd)
 744 {
 745         int ret = 0;
 746
 747         struct btrfs_inode_item cur_inode;
 748         struct btrfs_inode_item *inode_item;
 749         int count, i, dir_index_cnt;
 750         struct direct **files;
 751         struct stat st;
 752         struct directory_name_entry *dir_entry, *parent_dir_entry;
 753         struct direct *cur_file;
 754         ino_t parent_inum, cur_inum;
 755         ino_t highest_inum = 0;
 756         char *parent_dir_name;
 757         char real_path[PATH_MAX];
 758         struct btrfs_path path;
 759         struct extent_buffer *leaf;
 760         struct btrfs_key root_dir_key;
 761         u64 root_dir_inode_size = 0;
 762
 763         /* Add list for source directory */
 764         dir_entry = malloc(sizeof(struct directory_name_entry));
 765         dir_entry->dir_name = dir_name;
 766         dir_entry->path = realpath(dir_name, real_path);
 767         if (!dir_entry->path) {
 768                 fprintf(stderr, "get directory real path error\n");
 769                 ret = -1;
 770                 goto fail_no_dir;
 771         }
 772
 773         parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
 774         dir_entry->inum = parent_inum;
 775         list_add_tail(&dir_entry->list, &dir_head->list);
 776
 777         btrfs_init_path(&path);
 778
 779         root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
 780         root_dir_key.offset = 0;
 781         btrfs_set_key_type(&root_dir_key, BTRFS_INODE_ITEM_KEY);
 782         ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
 783         if (ret) {
 784                 fprintf(stderr, "root dir lookup error\n");
 785                 goto fail_no_dir;
 786         }
 787
 788         leaf = path.nodes[0];
 789         inode_item = btrfs_item_ptr(leaf, path.slots[0],
 790                                     struct btrfs_inode_item);
 791
 792         root_dir_inode_size = calculate_dir_inode_size(dir_name);
 793         btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
 794         btrfs_mark_buffer_dirty(leaf);
 795
 796         btrfs_release_path(&path);
 797
 798         do {
 799                 parent_dir_entry = list_entry(dir_head->list.next,
 800                                               struct directory_name_entry,
 801                                               list);
 802                 list_del(&parent_dir_entry->list);
 803
 804                 parent_inum = parent_dir_entry->inum;
 805                 parent_dir_name = parent_dir_entry->dir_name;
 806                 if (chdir(parent_dir_entry->path)) {
 807                         fprintf(stderr, "chdir error for %s\n",
 808                                 parent_dir_name);
 809                         ret = -1;
 810                         goto fail_no_files;
 811                 }
 812
 813                 count = scandir(parent_dir_entry->path, &files,
 814                                 directory_select, NULL);
 815                 if (count == -1)
 816                 {
 817                         fprintf(stderr, "scandir for %s failed: %s\n",
 818                                 parent_dir_name, strerror (errno));
 819                         ret = -1;
 820                         goto fail;
 821                 }
 822
 823                 for (i = 0; i < count; i++) {
 824                         cur_file = files[i];
 825
 826                         if (lstat(cur_file->d_name, &st) == -1) {
 827                                 fprintf(stderr, "lstat failed for file %s\n",
 828                                         cur_file->d_name);
 829                                 ret = -1;
 830                                 goto fail;
 831                         }
 832
 833                         cur_inum = st.st_ino;
 834                         ret = add_directory_items(trans, root,
 835                                                   cur_inum, parent_inum,
 836                                                   cur_file->d_name,
 837                                                   &st, &dir_index_cnt);
 838                         if (ret) {
 839                                 fprintf(stderr, "add_directory_items failed\n");
 840                                 goto fail;
 841                         }
 842
 843                         ret = add_inode_items(trans, root, &st,
 844                                               cur_file->d_name, cur_inum,
 845                                               parent_inum, dir_index_cnt,
 846                                               &cur_inode);
 847                         if (ret == -EEXIST) {
 848                                 BUG_ON(st.st_nlink <= 1);
 849                                 continue;
 850                         }
 851                         if (ret) {
 852                                 fprintf(stderr, "add_inode_items failed\n");
 853                                 goto fail;
 854                         }
 855
 856                         ret = add_xattr_item(trans, root,
 857                                              cur_inum, cur_file->d_name);
 858                         if (ret) {
 859                                 fprintf(stderr, "add_xattr_item failed\n");
 860                                 if(ret != -ENOTSUP)
 861                                         goto fail;
 862                         }
 863
 864                         if (S_ISDIR(st.st_mode)) {
 865                                 dir_entry = malloc(sizeof(struct directory_name_entry));
 866                                 dir_entry->dir_name = cur_file->d_name;
 867                                 dir_entry->path = make_path(parent_dir_entry->path,
 868                                                             cur_file->d_name);
 869                                 dir_entry->inum = cur_inum;
 870                                 list_add_tail(&dir_entry->list, &dir_head->list);
 871                         } else if (S_ISREG(st.st_mode)) {
 872                                 ret = add_file_items(trans, root, &cur_inode,
 873                                                      cur_inum, parent_inum, &st,
 874                                                      cur_file->d_name, out_fd);
 875                                 if (ret) {
 876                                         fprintf(stderr, "add_file_items failed\n");
 877                                         goto fail;
 878                                 }
 879                         } else if (S_ISLNK(st.st_mode)) {
 880                                 ret = add_symbolic_link(trans, root,
 881                                                         cur_inum, cur_file->d_name);
 882                                 if (ret) {
 883                                         fprintf(stderr, "add_symbolic_link failed\n");
 884                                         goto fail;
 885                                 }
 886                         }
 887                 }
 888
 889                 free_namelist(files, count);
 890                 free(parent_dir_entry);
 891
 892                 index_cnt = 2;
 893
 894         } while (!list_empty(&dir_head->list));
 895
 896 out:
 897         return !!ret;
 898 fail:
 899         free_namelist(files, count);
 900 fail_no_files:
 901         free(parent_dir_entry);
 902         goto out;
 903 fail_no_dir:
 904         free(dir_entry);
 905         goto out;
 906 }
 907
 908 static int open_target(char *output_name)
 909 {
 910         int output_fd;
 911         output_fd = open(output_name, O_CREAT | O_RDWR | O_TRUNC,
 912                          S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
 913
 914         return output_fd;
 915 }
 916
 917 static int create_chunks(struct btrfs_trans_handle *trans,
 918                          struct btrfs_root *root, u64 num_of_meta_chunks,
 919                          u64 size_of_data)
 920 {
 921         u64 chunk_start;
 922         u64 chunk_size;
 923         u64 meta_type = BTRFS_BLOCK_GROUP_METADATA;
 924         u64 data_type = BTRFS_BLOCK_GROUP_DATA;
 925         u64 minimum_data_chunk_size = 8 * 1024 * 1024;
 926         u64 i;
 927         int ret;
 928
 929         for (i = 0; i < num_of_meta_chunks; i++) {
 930                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 931                                         &chunk_start, &chunk_size, meta_type);
 932                 BUG_ON(ret);
 933                 ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 934                                              meta_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 935                                              chunk_start, chunk_size);
 936                 BUG_ON(ret);
 937                 set_extent_dirty(&root->fs_info->free_space_cache,
 938                                  chunk_start, chunk_start + chunk_size - 1, 0);
 939         }
 940
 941         if (size_of_data < minimum_data_chunk_size)
 942                 size_of_data = minimum_data_chunk_size;
 943
 944         ret = btrfs_alloc_data_chunk(trans, root->fs_info->extent_root,
 945                                      &chunk_start, size_of_data, data_type);
 946         BUG_ON(ret);
 947         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 948                                      data_type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 949                                      chunk_start, size_of_data);
 950         BUG_ON(ret);
 951         set_extent_dirty(&root->fs_info->free_space_cache,
 952                          chunk_start, chunk_start + size_of_data - 1, 0);
 953         return ret;
 954 }
 955
 956 static int make_image(char *source_dir, struct btrfs_root *root, int out_fd)
 957 {
 958         int ret;
 959         struct btrfs_trans_handle *trans;
 960
 961         struct stat root_st;
 962
 963         struct directory_name_entry dir_head;
 964
 965         struct directory_name_entry *dir_entry = NULL;
 966
 967         ret = lstat(source_dir, &root_st);
 968         if (ret) {
 969                 fprintf(stderr, "unable to lstat the %s\n", source_dir);
 970                 goto out;
 971         }
 972
 973         INIT_LIST_HEAD(&dir_head.list);
 974
 975         trans = btrfs_start_transaction(root, 1);
 976         ret = traverse_directory(trans, root, source_dir, &dir_head, out_fd);
 977         if (ret) {
 978                 fprintf(stderr, "unable to traverse_directory\n");
 979                 goto fail;
 980         }
 981         btrfs_commit_transaction(trans, root);
 982
 983         printf("Making image is completed.\n");
 984         return 0;
 985 fail:
 986         while (!list_empty(&dir_head.list)) {
 987                 dir_entry = list_entry(dir_head.list.next,
 988                                        struct directory_name_entry, list);
 989                 list_del(&dir_entry->list);
 990                 free(dir_entry);
 991         }
 992 out:
 993         fprintf(stderr, "Making image is aborted.\n");
 994         return -1;
 995 }
 996
 997 /*
 998  * This ignores symlinks with unreadable targets and subdirs that can't
 999  * be read.  It's a best-effort to give a rough estimate of the size of
1000  * a subdir.  It doesn't guarantee that prepopulating btrfs from this
1001  * tree won't still run out of space.
1002  *
1003  * The rounding up to 4096 is questionable.  Previous code used du -B 4096.
1004  */
1005 static u64 global_total_size;
1006 static int ftw_add_entry_size(const char *fpath, const struct stat *st,
1007                               int type)
1008 {
1009         if (type == FTW_F || type == FTW_D)
1010                 global_total_size += round_up(st->st_size, 4096);
1011
1012         return 0;
1013 }
1014
1015 static u64 size_sourcedir(char *dir_name, u64 sectorsize,
1016                           u64 *num_of_meta_chunks_ret, u64 *size_of_data_ret)
1017 {
1018         u64 dir_size = 0;
1019         u64 total_size = 0;
1020         int ret;
1021         u64 default_chunk_size = 8 * 1024 * 1024;       /* 8MB */
1022         u64 allocated_meta_size = 8 * 1024 * 1024;      /* 8MB */
1023         u64 allocated_total_size = 20 * 1024 * 1024;    /* 20MB */
1024         u64 num_of_meta_chunks = 0;
1025         u64 num_of_data_chunks = 0;
1026         u64 num_of_allocated_meta_chunks =
1027                         allocated_meta_size / default_chunk_size;
1028
1029         global_total_size = 0;
1030         ret = ftw(dir_name, ftw_add_entry_size, 10);
1031         dir_size = global_total_size;
1032         if (ret < 0) {
1033                 fprintf(stderr, "ftw subdir walk of '%s' failed: %s\n",
1034                         dir_name, strerror(errno));
1035                 exit(1);
1036         }
1037
1038         num_of_data_chunks = (dir_size + default_chunk_size - 1) /
1039                 default_chunk_size;
1040
1041         num_of_meta_chunks = (dir_size / 2) / default_chunk_size;
1042         if (((dir_size / 2) % default_chunk_size) != 0)
1043                 num_of_meta_chunks++;
1044         if (num_of_meta_chunks <= num_of_allocated_meta_chunks)
1045                 num_of_meta_chunks = 0;
1046         else
1047                 num_of_meta_chunks -= num_of_allocated_meta_chunks;
1048
1049         total_size = allocated_total_size +
1050                      (num_of_data_chunks * default_chunk_size) +
1051                      (num_of_meta_chunks * default_chunk_size);
1052
1053         *num_of_meta_chunks_ret = num_of_meta_chunks;
1054         *size_of_data_ret = num_of_data_chunks * default_chunk_size;
1055         return total_size;
1056 }
1057
1058 static int zero_output_file(int out_fd, u64 size, u32 sectorsize)
1059 {
1060         int len = sectorsize;
1061         int loop_num = size / sectorsize;
1062         u64 location = 0;
1063         char *buf = malloc(len);
1064         int ret = 0, i;
1065         ssize_t written;
1066
1067         if (!buf)
1068                 return -ENOMEM;
1069         memset(buf, 0, len);
1070         for (i = 0; i < loop_num; i++) {
1071                 written = pwrite64(out_fd, buf, len, location);
1072                 if (written != len)
1073                         ret = -EIO;
1074                 location += sectorsize;
1075         }
1076         free(buf);
1077         return ret;
1078 }
1079
1080 static int check_leaf_or_node_size(u32 size, u32 sectorsize)
1081 {
1082         if (size < sectorsize) {
1083                 fprintf(stderr,
1084                         "Illegal leafsize (or nodesize) %u (smaller than %u)\n",
1085                         size, sectorsize);
1086                 return -1;
1087         } else if (size > BTRFS_MAX_METADATA_BLOCKSIZE) {
1088                 fprintf(stderr,
1089                         "Illegal leafsize (or nodesize) %u (larger than %u)\n",
1090                         size, BTRFS_MAX_METADATA_BLOCKSIZE);
1091                 return -1;
1092         } else if (size & (sectorsize - 1)) {
1093                 fprintf(stderr,
1094                         "Illegal leafsize (or nodesize) %u (not align to %u)\n",
1095                         size, sectorsize);
1096                 return -1;
1097         }
1098         return 0;
1099 }
1100
1101 static int is_ssd(const char *file)
1102 {
1103         blkid_probe probe;
1104         char wholedisk[32];
1105         char sysfs_path[PATH_MAX];
1106         dev_t devno;
1107         int fd;
1108         char rotational;
1109         int ret;
1110
1111         probe = blkid_new_probe_from_filename(file);
1112         if (!probe)
1113                 return 0;
1114
1115         /* Device number of this disk (possibly a partition) */
1116         devno = blkid_probe_get_devno(probe);
1117         if (!devno) {
1118                 blkid_free_probe(probe);
1119                 return 0;
1120         }
1121
1122         /* Get whole disk name (not full path) for this devno */
1123         ret = blkid_devno_to_wholedisk(devno,
1124                         wholedisk, sizeof(wholedisk), NULL);
1125         if (ret) {
1126                 blkid_free_probe(probe);
1127                 return 0;
1128         }
1129
1130         snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational",
1131                  wholedisk);
1132
1133         blkid_free_probe(probe);
1134
1135         fd = open(sysfs_path, O_RDONLY);
1136         if (fd < 0) {
1137                 return 0;
1138         }
1139
1140         if (read(fd, &rotational, sizeof(char)) < sizeof(char)) {
1141                 close(fd);
1142                 return 0;
1143         }
1144         close(fd);
1145
1146         return !atoi((const char *)&rotational);
1147 }
1148
1149 #define BTRFS_FEATURE_LIST_ALL          (1ULL << 63)
1150
1151 static const struct btrfs_fs_feature {
1152         const char *name;
1153         u64 flag;
1154         const char *desc;
1155 } mkfs_features[] = {
1156         { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
1157                 "mixed data and metadata block groups" },
1158         { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
1159                 "increased hardlink limit per file to 65536" },
1160         { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
1161                 "raid56 extended format" },
1162         { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
1163                 "reduced-size metadata extent refs" },
1164         { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
1165                 "no explicit hole extents for files" },
1166         /* Keep this one last */
1167         { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
1168 };
1169
1170 static void list_all_fs_features(void)
1171 {
1172         int i;
1173
1174         fprintf(stderr, "Filesystem features available at mkfs time:\n");
1175         for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
1176                 char *is_default = "";
1177
1178                 if (mkfs_features[i].flag & DEFAULT_MKFS_FEATURES)
1179                         is_default = ", default";
1180                 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
1181                                 mkfs_features[i].name,
1182                                 mkfs_features[i].desc,
1183                                 mkfs_features[i].flag,
1184                                 is_default);
1185         }
1186 }
1187
1188 static int parse_one_fs_feature(const char *name, u64 *flags)
1189 {
1190         int i;
1191         int found = 0;
1192
1193         for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
1194                 if (name[0] == '^' &&
1195                         !strcmp(mkfs_features[i].name, name + 1)) {
1196                         *flags &= ~ mkfs_features[i].flag;
1197                         found = 1;
1198                 } else if (!strcmp(mkfs_features[i].name, name)) {
1199                         *flags |= mkfs_features[i].flag;
1200                         found = 1;
1201                 }
1202         }
1203
1204         return !found;
1205 }
1206
1207 static void process_fs_features(u64 flags)
1208 {
1209         int i;
1210
1211         for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
1212                 if (flags & mkfs_features[i].flag) {
1213                         printf("Turning ON incompat feature '%s': %s\n",
1214                                 mkfs_features[i].name,
1215                                 mkfs_features[i].desc);
1216                 }
1217         }
1218 }
1219
1220
1221 /*
1222  * Return NULL if all features were parsed fine, otherwise return the name of
1223  * the first unparsed.
1224  */
1225 static char* parse_fs_features(char *namelist, u64 *flags)
1226 {
1227         char *this_char;
1228         char *save_ptr = NULL; /* Satisfy static checkers */
1229
1230         for (this_char = strtok_r(namelist, ",", &save_ptr);
1231              this_char != NULL;
1232              this_char = strtok_r(NULL, ",", &save_ptr)) {
1233                 if (parse_one_fs_feature(this_char, flags))
1234                         return this_char;
1235         }
1236
1237         return NULL;
1238 }
1239
1240 int main(int ac, char **av)
1241 {
1242         char *file;
1243         struct btrfs_root *root;
1244         struct btrfs_trans_handle *trans;
1245         char *label = NULL;
1246         char *first_file;
1247         u64 block_count = 0;
1248         u64 dev_block_count = 0;
1249         u64 blocks[7];
1250         u64 alloc_start = 0;
1251         u64 metadata_profile = 0;
1252         u64 data_profile = 0;
1253         u32 leafsize = max_t(u32, sysconf(_SC_PAGESIZE), DEFAULT_MKFS_LEAF_SIZE);
1254         u32 sectorsize = 4096;
1255         u32 nodesize = leafsize;
1256         u32 stripesize = 4096;
1257         int zero_end = 1;
1258         int option_index = 0;
1259         int fd;
1260         int ret;
1261         int i;
1262         int mixed = 0;
1263         int leaf_forced = 0;
1264         int data_profile_opt = 0;
1265         int metadata_profile_opt = 0;
1266         int discard = 1;
1267         int ssd = 0;
1268         int force_overwrite = 0;
1269
1270         char *source_dir = NULL;
1271         int source_dir_set = 0;
1272         u64 num_of_meta_chunks = 0;
1273         u64 size_of_data = 0;
1274         u64 source_dir_size = 0;
1275         int dev_cnt = 0;
1276         int saved_optind;
1277         char estr[100];
1278         char *fs_uuid = NULL;
1279         u64 features = DEFAULT_MKFS_FEATURES;
1280
1281         while(1) {
1282                 int c;
1283                 c = getopt_long(ac, av, "A:b:fl:n:s:m:d:L:O:r:U:VMK",
1284                                 long_options, &option_index);
1285                 if (c < 0)
1286                         break;
1287                 switch(c) {
1288                         case 'A':
1289                                 alloc_start = parse_size(optarg);
1290                                 break;
1291                         case 'f':
1292                                 force_overwrite = 1;
1293                                 break;
1294                         case 'd':
1295                                 data_profile = parse_profile(optarg);
1296                                 data_profile_opt = 1;
1297                                 break;
1298                         case 'l':
1299                         case 'n':
1300                                 nodesize = parse_size(optarg);
1301                                 leafsize = parse_size(optarg);
1302                                 leaf_forced = 1;
1303                                 break;
1304                         case 'L':
1305                                 label = parse_label(optarg);
1306                                 break;
1307                         case 'm':
1308                                 metadata_profile = parse_profile(optarg);
1309                                 metadata_profile_opt = 1;
1310                                 break;
1311                         case 'M':
1312                                 mixed = 1;
1313                                 break;
1314                         case 'O': {
1315                                 char *orig = strdup(optarg);
1316                                 char *tmp = orig;
1317
1318                                 tmp = parse_fs_features(tmp, &features);
1319                                 if (tmp) {
1320                                         fprintf(stderr,
1321                                                 "Unrecognized filesystem feature '%s'\n",
1322                                                         tmp);
1323                                         free(orig);
1324                                         exit(1);
1325                                 }
1326                                 free(orig);
1327                                 if (features & BTRFS_FEATURE_LIST_ALL) {
1328                                         list_all_fs_features();
1329                                         exit(0);
1330                                 }
1331                                 break;
1332                                 }
1333                         case 's':
1334                                 sectorsize = parse_size(optarg);
1335                                 break;
1336                         case 'b':
1337                                 block_count = parse_size(optarg);
1338                                 if (block_count <= 1024*1024*1024) {
1339                                         printf("SMALL VOLUME: forcing mixed "
1340                                                "metadata/data groups\n");
1341                                         mixed = 1;
1342                                 }
1343                                 zero_end = 0;
1344                                 break;
1345                         case 'V':
1346                                 print_version();
1347                                 break;
1348                         case 'r':
1349                                 source_dir = optarg;
1350                                 source_dir_set = 1;
1351                                 break;
1352                         case 'U':
1353                                 fs_uuid = optarg;
1354                                 break;
1355                         case 'K':
1356                                 discard = 0;
1357                                 break;
1358                         default:
1359                                 print_usage();
1360                 }
1361         }
1362         sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));
1363         if (check_leaf_or_node_size(leafsize, sectorsize))
1364                 exit(1);
1365         if (check_leaf_or_node_size(nodesize, sectorsize))
1366                 exit(1);
1367         saved_optind = optind;
1368         dev_cnt = ac - optind;
1369         if (dev_cnt == 0)
1370                 print_usage();
1371
1372         if (source_dir_set && dev_cnt > 1) {
1373                 fprintf(stderr,
1374                         "The -r option is limited to a single device\n");
1375                 exit(1);
1376         }
1377
1378         if (fs_uuid) {
1379                 uuid_t dummy_uuid;
1380
1381                 if (uuid_parse(fs_uuid, dummy_uuid) != 0) {
1382                         fprintf(stderr, "could not parse UUID: %s\n", fs_uuid);
1383                         exit(1);
1384                 }
1385                 if (!test_uuid_unique(fs_uuid)) {
1386                         fprintf(stderr, "non-unique UUID: %s\n", fs_uuid);
1387                         exit(1);
1388                 }
1389         }
1390
1391         while (dev_cnt-- > 0) {
1392                 file = av[optind++];
1393                 if (is_block_device(file))
1394                         if (test_dev_for_mkfs(file, force_overwrite, estr)) {
1395                                 fprintf(stderr, "Error: %s", estr);
1396                                 exit(1);
1397                         }
1398         }
1399
1400         optind = saved_optind;
1401         dev_cnt = ac - optind;
1402
1403         file = av[optind++];
1404         ssd = is_ssd(file);
1405
1406         if (is_vol_small(file)) {
1407                 printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
1408                 mixed = 1;
1409         }
1410
1411         /*
1412         * Set default profiles according to number of added devices.
1413         * For mixed groups defaults are single/single.
1414         */
1415         if (!mixed) {
1416                 if (!metadata_profile_opt) {
1417                         if (dev_cnt == 1 && ssd)
1418                                 printf("Detected a SSD, turning off metadata "
1419                                 "duplication.  Mkfs with -m dup if you want to "
1420                                 "force metadata duplication.\n");
1421
1422                         metadata_profile = (dev_cnt > 1) ?
1423                                         BTRFS_BLOCK_GROUP_RAID1 : (ssd) ?
1424                                         0: BTRFS_BLOCK_GROUP_DUP;
1425                 }
1426                 if (!data_profile_opt) {
1427                         data_profile = (dev_cnt > 1) ?
1428                                 BTRFS_BLOCK_GROUP_RAID0 : 0; /* raid0 or single */
1429                 }
1430         } else {
1431                 u32 best_leafsize = max_t(u32, sysconf(_SC_PAGESIZE), sectorsize);
1432
1433                 if (metadata_profile_opt || data_profile_opt) {
1434                         if (metadata_profile != data_profile) {
1435                                 fprintf(stderr,
1436         "ERROR: With mixed block groups data and metadata profiles must be the same\n");
1437                                 exit(1);
1438                         }
1439                 }
1440
1441                 if (!leaf_forced) {
1442                         leafsize = best_leafsize;
1443                         nodesize = best_leafsize;
1444                         if (check_leaf_or_node_size(leafsize, sectorsize))
1445                                 exit(1);
1446                 }
1447                 if (leafsize != sectorsize) {
1448                         fprintf(stderr, "Error: mixed metadata/data block groups "
1449                                 "require metadata blocksizes equal to the sectorsize\n");
1450                         exit(1);
1451                 }
1452         }
1453
1454         /* Check device/block_count after the leafsize is determined */
1455         if (block_count && block_count < btrfs_min_dev_size(leafsize)) {
1456                 fprintf(stderr,
1457                         "Size '%llu' is too small to make a usable filesystem\n",
1458                         block_count);
1459                 fprintf(stderr,
1460                         "Minimum size for btrfs filesystem is %llu\n",
1461                         btrfs_min_dev_size(leafsize));
1462                 exit(1);
1463         }
1464         for (i = saved_optind; i < saved_optind + dev_cnt; i++) {
1465                 char *path;
1466
1467                 path = av[i];
1468                 ret = test_minimum_size(path, leafsize);
1469                 if (ret < 0) {
1470                         fprintf(stderr, "Failed to check size for '%s': %s\n",
1471                                 path, strerror(-ret));
1472                         exit (1);
1473                 }
1474                 if (ret > 0) {
1475                         fprintf(stderr,
1476                                 "'%s' is too small to make a usable filesystem\n",
1477                                 path);
1478                         fprintf(stderr,
1479                                 "Minimum size for each btrfs device is %llu.\n",
1480                                 btrfs_min_dev_size(leafsize));
1481                         exit(1);
1482                 }
1483         }
1484         ret = test_num_disk_vs_raid(metadata_profile, data_profile,
1485                         dev_cnt, mixed, estr);
1486         if (ret) {
1487                 fprintf(stderr, "Error: %s\n", estr);
1488                 exit(1);
1489         }
1490
1491         /* if we are here that means all devs are good to btrfsify */
1492         printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
1493         printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
1494
1495         dev_cnt--;
1496
1497         if (!source_dir_set) {
1498                 /*
1499                  * open without O_EXCL so that the problem should not
1500                  * occur by the following processing.
1501                  * (btrfs_register_one_device() fails if O_EXCL is on)
1502                  */
1503                 fd = open(file, O_RDWR);
1504                 if (fd < 0) {
1505                         fprintf(stderr, "unable to open %s: %s\n", file,
1506                                 strerror(errno));
1507                         exit(1);
1508                 }
1509                 first_file = file;
1510                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1511                                            block_count, &mixed, discard);
1512                 if (ret) {
1513                         close(fd);
1514                         exit(1);
1515                 }
1516                 if (block_count && block_count > dev_block_count) {
1517                         fprintf(stderr, "%s is smaller than requested size\n", file);
1518                         exit(1);
1519                 }
1520         } else {
1521                 fd = open_target(file);
1522                 if (fd < 0) {
1523                         fprintf(stderr, "unable to open the %s\n", file);
1524                         exit(1);
1525                 }
1526
1527                 first_file = file;
1528                 source_dir_size = size_sourcedir(source_dir, sectorsize,
1529                                              &num_of_meta_chunks, &size_of_data);
1530                 if(block_count < source_dir_size)
1531                         block_count = source_dir_size;
1532                 ret = zero_output_file(fd, block_count, sectorsize);
1533                 if (ret) {
1534                         fprintf(stderr, "unable to zero the output file\n");
1535                         exit(1);
1536                 }
1537                 /* our "device" is the new image file */
1538                 dev_block_count = block_count;
1539         }
1540
1541         /* To create the first block group and chunk 0 in make_btrfs */
1542         if (dev_block_count < BTRFS_MKFS_SYSTEM_GROUP_SIZE) {
1543                 fprintf(stderr, "device is too small to make filesystem\n");
1544                 exit(1);
1545         }
1546
1547         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
1548         for (i = 1; i < 7; i++) {
1549                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
1550                         leafsize * i;
1551         }
1552
1553         /*
1554          * FS features that can be set by other means than -O
1555          * just set the bit here
1556          */
1557         if (mixed)
1558                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
1559
1560         if ((data_profile | metadata_profile) &
1561             (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
1562                 features |= BTRFS_FEATURE_INCOMPAT_RAID56;
1563         }
1564
1565         process_fs_features(features);
1566
1567         ret = make_btrfs(fd, file, label, fs_uuid, blocks, dev_block_count,
1568                          nodesize, leafsize,
1569                          sectorsize, stripesize, features);
1570         if (ret) {
1571                 fprintf(stderr, "error during mkfs: %s\n", strerror(-ret));
1572                 exit(1);
1573         }
1574
1575         root = open_ctree(file, 0, OPEN_CTREE_WRITES);
1576         if (!root) {
1577                 fprintf(stderr, "Open ctree failed\n");
1578                 close(fd);
1579                 exit(1);
1580         }
1581         root->fs_info->alloc_start = alloc_start;
1582
1583         ret = make_root_dir(root, mixed);
1584         if (ret) {
1585                 fprintf(stderr, "failed to setup the root directory\n");
1586                 exit(1);
1587         }
1588
1589         trans = btrfs_start_transaction(root, 1);
1590
1591         if (dev_cnt == 0)
1592                 goto raid_groups;
1593
1594         btrfs_register_one_device(file);
1595
1596         while (dev_cnt-- > 0) {
1597                 int old_mixed = mixed;
1598
1599                 file = av[optind++];
1600
1601                 /*
1602                  * open without O_EXCL so that the problem should not
1603                  * occur by the following processing.
1604                  * (btrfs_register_one_device() fails if O_EXCL is on)
1605                  */
1606                 fd = open(file, O_RDWR);
1607                 if (fd < 0) {
1608                         fprintf(stderr, "unable to open %s: %s\n", file,
1609                                 strerror(errno));
1610                         exit(1);
1611                 }
1612                 ret = btrfs_device_already_in_root(root, fd,
1613                                                    BTRFS_SUPER_INFO_OFFSET);
1614                 if (ret) {
1615                         fprintf(stderr, "skipping duplicate device %s in FS\n",
1616                                 file);
1617                         close(fd);
1618                         continue;
1619                 }
1620                 ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
1621                                            block_count, &mixed, discard);
1622                 if (ret) {
1623                         close(fd);
1624                         exit(1);
1625                 }
1626                 mixed = old_mixed;
1627
1628                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
1629                                         sectorsize, sectorsize, sectorsize);
1630                 BUG_ON(ret);
1631                 btrfs_register_one_device(file);
1632         }
1633
1634 raid_groups:
1635         if (!source_dir_set) {
1636                 ret = create_raid_groups(trans, root, data_profile,
1637                                  data_profile_opt, metadata_profile,
1638                                  mixed);
1639                 BUG_ON(ret);
1640         }
1641
1642         ret = create_data_reloc_tree(trans, root);
1643         BUG_ON(ret);
1644
1645         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
1646             "sectorsize %u size %s\n",
1647             label, first_file, nodesize, leafsize, sectorsize,
1648             pretty_size(btrfs_super_total_bytes(root->fs_info->super_copy)));
1649
1650         printf("%s\n", BTRFS_BUILD_VERSION);
1651         btrfs_commit_transaction(trans, root);
1652
1653         if (source_dir_set) {
1654                 trans = btrfs_start_transaction(root, 1);
1655                 ret = create_chunks(trans, root,
1656                                     num_of_meta_chunks, size_of_data);
1657                 BUG_ON(ret);
1658                 btrfs_commit_transaction(trans, root);
1659
1660                 ret = make_image(source_dir, root, fd);
1661                 BUG_ON(ret);
1662         }
1663
1664         ret = close_ctree(root);
1665         BUG_ON(ret);
1666         free(label);
1667         return 0;
1668 }