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 #ifndef __CHECKER__
  23 #include <sys/ioctl.h>
  24 #include <sys/mount.h>
  25 #include "ioctl.h"
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <getopt.h>
  35 #include <uuid/uuid.h>
  36 #include <linux/fs.h>
  37 #include <ctype.h>
  38 #include "kerncompat.h"
  39 #include "ctree.h"
  40 #include "disk-io.h"
  41 #include "volumes.h"
  42 #include "transaction.h"
  43 #include "utils.h"
  44 #include "version.h"
  45
  46 static u64 parse_size(char *s)
  47 {
  48         int len = strlen(s);
  49         char c;
  50         u64 mult = 1;
  51
  52         if (!isdigit(s[len - 1])) {
  53                 c = tolower(s[len - 1]);
  54                 switch (c) {
  55                 case 'g':
  56                         mult *= 1024;
  57                 case 'm':
  58                         mult *= 1024;
  59                 case 'k':
  60                         mult *= 1024;
  61                 case 'b':
  62                         break;
  63                 default:
  64                         fprintf(stderr, "Unknown size descriptor %c\n", c);
  65                         exit(1);
  66                 }
  67                 s[len - 1] = '\0';
  68         }
  69         return atol(s) * mult;
  70 }
  71
  72 static int make_root_dir(struct btrfs_root *root, int mixed)
  73 {
  74         struct btrfs_trans_handle *trans;
  75         struct btrfs_key location;
  76         u64 bytes_used;
  77         u64 chunk_start = 0;
  78         u64 chunk_size = 0;
  79         int ret;
  80
  81         trans = btrfs_start_transaction(root, 1);
  82         bytes_used = btrfs_super_bytes_used(&root->fs_info->super_copy);
  83
  84         root->fs_info->system_allocs = 1;
  85         ret = btrfs_make_block_group(trans, root, bytes_used,
  86                                      BTRFS_BLOCK_GROUP_SYSTEM,
  87                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  88                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  89         BUG_ON(ret);
  90
  91         if (mixed) {
  92                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  93                                         &chunk_start, &chunk_size,
  94                                         BTRFS_BLOCK_GROUP_METADATA |
  95                                         BTRFS_BLOCK_GROUP_DATA);
  96                 BUG_ON(ret);
  97                 ret = btrfs_make_block_group(trans, root, 0,
  98                                              BTRFS_BLOCK_GROUP_METADATA |
  99                                              BTRFS_BLOCK_GROUP_DATA,
 100                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 101                                              chunk_start, chunk_size);
 102                 BUG_ON(ret);
 103                 printf("Created a data/metadata chunk of size %llu\n", chunk_size);
 104         } else {
 105                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 106                                         &chunk_start, &chunk_size,
 107                                         BTRFS_BLOCK_GROUP_METADATA);
 108                 BUG_ON(ret);
 109                 ret = btrfs_make_block_group(trans, root, 0,
 110                                              BTRFS_BLOCK_GROUP_METADATA,
 111                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 112                                              chunk_start, chunk_size);
 113                 BUG_ON(ret);
 114         }
 115
 116         root->fs_info->system_allocs = 0;
 117         btrfs_commit_transaction(trans, root);
 118         trans = btrfs_start_transaction(root, 1);
 119         BUG_ON(!trans);
 120
 121         if (!mixed) {
 122                 ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 123                                         &chunk_start, &chunk_size,
 124                                         BTRFS_BLOCK_GROUP_DATA);
 125                 BUG_ON(ret);
 126                 ret = btrfs_make_block_group(trans, root, 0,
 127                                              BTRFS_BLOCK_GROUP_DATA,
 128                                              BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 129                                              chunk_start, chunk_size);
 130                 BUG_ON(ret);
 131         }
 132
 133         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 134                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 135         if (ret)
 136                 goto err;
 137         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 138         if (ret)
 139                 goto err;
 140         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 141         location.offset = (u64)-1;
 142         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 143                         "default", 7,
 144                         btrfs_super_root_dir(&root->fs_info->super_copy),
 145                         &location, BTRFS_FT_DIR, 0);
 146         if (ret)
 147                 goto err;
 148
 149         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 150                              "default", 7, location.objectid,
 151                              BTRFS_ROOT_TREE_DIR_OBJECTID, 0);
 152         if (ret)
 153                 goto err;
 154
 155         btrfs_commit_transaction(trans, root);
 156 err:
 157         return ret;
 158 }
 159
 160 static int recow_roots(struct btrfs_trans_handle *trans,
 161                        struct btrfs_root *root)
 162 {
 163         int ret;
 164         struct extent_buffer *tmp;
 165         struct btrfs_fs_info *info = root->fs_info;
 166
 167         ret = __btrfs_cow_block(trans, info->fs_root, info->fs_root->node,
 168                                 NULL, 0, &tmp, 0, 0);
 169         BUG_ON(ret);
 170         free_extent_buffer(tmp);
 171
 172         ret = __btrfs_cow_block(trans, info->tree_root, info->tree_root->node,
 173                                 NULL, 0, &tmp, 0, 0);
 174         BUG_ON(ret);
 175         free_extent_buffer(tmp);
 176
 177         ret = __btrfs_cow_block(trans, info->extent_root,
 178                                 info->extent_root->node, NULL, 0, &tmp, 0, 0);
 179         BUG_ON(ret);
 180         free_extent_buffer(tmp);
 181
 182         ret = __btrfs_cow_block(trans, info->chunk_root, info->chunk_root->node,
 183                                 NULL, 0, &tmp, 0, 0);
 184         BUG_ON(ret);
 185         free_extent_buffer(tmp);
 186
 187
 188         ret = __btrfs_cow_block(trans, info->dev_root, info->dev_root->node,
 189                                 NULL, 0, &tmp, 0, 0);
 190         BUG_ON(ret);
 191         free_extent_buffer(tmp);
 192
 193         ret = __btrfs_cow_block(trans, info->csum_root, info->csum_root->node,
 194                                 NULL, 0, &tmp, 0, 0);
 195         BUG_ON(ret);
 196         free_extent_buffer(tmp);
 197
 198         return 0;
 199 }
 200
 201 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 202                               struct btrfs_root *root, u64 type)
 203 {
 204         u64 chunk_start;
 205         u64 chunk_size;
 206         int ret;
 207
 208         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 209                                 &chunk_start, &chunk_size, type);
 210         BUG_ON(ret);
 211         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 212                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 213                                      chunk_start, chunk_size);
 214         BUG_ON(ret);
 215         return ret;
 216 }
 217
 218 static int create_raid_groups(struct btrfs_trans_handle *trans,
 219                               struct btrfs_root *root, u64 data_profile,
 220                               u64 metadata_profile, int mixed)
 221 {
 222         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 223         u64 allowed;
 224         int ret;
 225
 226         if (num_devices == 1)
 227                 allowed = BTRFS_BLOCK_GROUP_DUP;
 228         else if (num_devices >= 4) {
 229                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 230                         BTRFS_BLOCK_GROUP_RAID10;
 231         } else
 232                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 233
 234         if (allowed & metadata_profile) {
 235                 u64 meta_flags = BTRFS_BLOCK_GROUP_METADATA;
 236
 237                 ret = create_one_raid_group(trans, root,
 238                                             BTRFS_BLOCK_GROUP_SYSTEM |
 239                                             (allowed & metadata_profile));
 240                 BUG_ON(ret);
 241
 242                 if (mixed)
 243                         meta_flags |= BTRFS_BLOCK_GROUP_DATA;
 244
 245                 ret = create_one_raid_group(trans, root, meta_flags |
 246                                             (allowed & metadata_profile));
 247                 BUG_ON(ret);
 248
 249                 ret = recow_roots(trans, root);
 250                 BUG_ON(ret);
 251         }
 252         if (!mixed && num_devices > 1 && (allowed & data_profile)) {
 253                 ret = create_one_raid_group(trans, root,
 254                                             BTRFS_BLOCK_GROUP_DATA |
 255                                             (allowed & data_profile));
 256                 BUG_ON(ret);
 257         }
 258         return 0;
 259 }
 260
 261 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 262                                   struct btrfs_root *root)
 263 {
 264         struct btrfs_key location;
 265         struct btrfs_root_item root_item;
 266         struct extent_buffer *tmp;
 267         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 268         int ret;
 269
 270         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 271         BUG_ON(ret);
 272
 273         memcpy(&root_item, &root->root_item, sizeof(root_item));
 274         btrfs_set_root_bytenr(&root_item, tmp->start);
 275         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 276         btrfs_set_root_generation(&root_item, trans->transid);
 277         free_extent_buffer(tmp);
 278
 279         location.objectid = objectid;
 280         location.type = BTRFS_ROOT_ITEM_KEY;
 281         location.offset = 0;
 282         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 283                                 &location, &root_item);
 284         BUG_ON(ret);
 285         return 0;
 286 }
 287
 288 static void print_usage(void)
 289 {
 290         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 291         fprintf(stderr, "options:\n");
 292         fprintf(stderr, "\t -A --alloc-start the offset to start the FS\n");
 293         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 294         fprintf(stderr, "\t -d --data data profile, raid0, raid1, raid10 or single\n");
 295         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 296         fprintf(stderr, "\t -L --label set a label\n");
 297         fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
 298         fprintf(stderr, "\t -M --mixed mix metadata and data together\n");
 299         fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
 300         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 301         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
 302         exit(1);
 303 }
 304
 305 static void print_version(void)
 306 {
 307         fprintf(stderr, "mkfs.btrfs, part of %s\n", BTRFS_BUILD_VERSION);
 308         exit(0);
 309 }
 310
 311 static u64 parse_profile(char *s)
 312 {
 313         if (strcmp(s, "raid0") == 0) {
 314                 return BTRFS_BLOCK_GROUP_RAID0;
 315         } else if (strcmp(s, "raid1") == 0) {
 316                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 317         } else if (strcmp(s, "raid10") == 0) {
 318                 return BTRFS_BLOCK_GROUP_RAID10 | BTRFS_BLOCK_GROUP_DUP;
 319         } else if (strcmp(s, "single") == 0) {
 320                 return 0;
 321         } else {
 322                 fprintf(stderr, "Unknown option %s\n", s);
 323                 print_usage();
 324         }
 325         return 0;
 326 }
 327
 328 static char *parse_label(char *input)
 329 {
 330         int i;
 331         int len = strlen(input);
 332
 333         if (len > BTRFS_LABEL_SIZE) {
 334                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 335                         BTRFS_LABEL_SIZE);
 336                 exit(1);
 337         }
 338         for (i = 0; i < len; i++) {
 339                 if (input[i] == '/' || input[i] == '\\') {
 340                         fprintf(stderr, "invalid label %s\n", input);
 341                         exit(1);
 342                 }
 343         }
 344         return strdup(input);
 345 }
 346
 347 static struct option long_options[] = {
 348         { "alloc-start", 1, NULL, 'A'},
 349         { "byte-count", 1, NULL, 'b' },
 350         { "leafsize", 1, NULL, 'l' },
 351         { "label", 1, NULL, 'L'},
 352         { "metadata", 1, NULL, 'm' },
 353         { "mixed", 0, NULL, 'M' },
 354         { "nodesize", 1, NULL, 'n' },
 355         { "sectorsize", 1, NULL, 's' },
 356         { "data", 1, NULL, 'd' },
 357         { "version", 0, NULL, 'V' },
 358         { 0, 0, 0, 0}
 359 };
 360
 361 int main(int ac, char **av)
 362 {
 363         char *file;
 364         struct btrfs_root *root;
 365         struct btrfs_trans_handle *trans;
 366         char *label = NULL;
 367         char *first_file;
 368         u64 block_count = 0;
 369         u64 dev_block_count = 0;
 370         u64 blocks[7];
 371         u64 alloc_start = 0;
 372         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 373         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 374         u32 leafsize = getpagesize();
 375         u32 sectorsize = 4096;
 376         u32 nodesize = leafsize;
 377         u32 stripesize = 4096;
 378         int zero_end = 1;
 379         int option_index = 0;
 380         int fd;
 381         int first_fd;
 382         int ret;
 383         int i;
 384         int mixed = 0;
 385         int data_profile_opt = 0;
 386         int metadata_profile_opt = 0;
 387
 388         while(1) {
 389                 int c;
 390                 c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:VM", long_options,
 391                                 &option_index);
 392                 if (c < 0)
 393                         break;
 394                 switch(c) {
 395                         case 'A':
 396                                 alloc_start = parse_size(optarg);
 397                                 break;
 398                         case 'd':
 399                                 data_profile = parse_profile(optarg);
 400                                 data_profile_opt = 1;
 401                                 break;
 402                         case 'l':
 403                                 leafsize = parse_size(optarg);
 404                                 break;
 405                         case 'L':
 406                                 label = parse_label(optarg);
 407                                 break;
 408                         case 'm':
 409                                 metadata_profile = parse_profile(optarg);
 410                                 metadata_profile_opt = 1;
 411                                 break;
 412                         case 'M':
 413                                 mixed = 1;
 414                                 break;
 415                         case 'n':
 416                                 nodesize = parse_size(optarg);
 417                                 break;
 418                         case 's':
 419                                 sectorsize = parse_size(optarg);
 420                                 break;
 421                         case 'b':
 422                                 block_count = parse_size(optarg);
 423                                 if (block_count <= 1024*1024*1024) {
 424                                         printf("SMALL VOLUME: forcing mixed "
 425                                                "metadata/data groups\n");
 426                                         mixed = 1;
 427                                 }
 428                                 zero_end = 0;
 429                                 break;
 430                         case 'V':
 431                                 print_version();
 432                                 break;
 433                         default:
 434                                 print_usage();
 435                 }
 436         }
 437         sectorsize = max(sectorsize, (u32)getpagesize());
 438         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 439                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 440                 exit(1);
 441         }
 442         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 443                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 444                 exit(1);
 445         }
 446         ac = ac - optind;
 447         if (ac == 0)
 448                 print_usage();
 449
 450         printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
 451         printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
 452
 453         file = av[optind++];
 454         ret = check_mounted(file);
 455         if (ret < 0) {
 456                 fprintf(stderr, "error checking %s mount status\n", file);
 457                 exit(1);
 458         }
 459         if (ret == 1) {
 460                 fprintf(stderr, "%s is mounted\n", file);
 461                 exit(1);
 462         }
 463         ac--;
 464         fd = open(file, O_RDWR);
 465         if (fd < 0) {
 466                 fprintf(stderr, "unable to open %s\n", file);
 467                 exit(1);
 468         }
 469         first_fd = fd;
 470         first_file = file;
 471         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count,
 472                                    &mixed);
 473         if (block_count == 0)
 474                 block_count = dev_block_count;
 475         if (mixed) {
 476                 if (!metadata_profile_opt)
 477                         metadata_profile = 0;
 478                 if (!data_profile_opt)
 479                         data_profile = 0;
 480
 481                 if (metadata_profile != data_profile) {
 482                         fprintf(stderr, "With mixed block groups data and metadata "
 483                                 "profiles must be the same\n");
 484                         exit(1);
 485                 }
 486         }
 487
 488         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
 489         for (i = 1; i < 7; i++) {
 490                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
 491                         leafsize * i;
 492         }
 493
 494         ret = make_btrfs(fd, file, label, blocks, block_count,
 495                          nodesize, leafsize,
 496                          sectorsize, stripesize);
 497         if (ret) {
 498                 fprintf(stderr, "error during mkfs %d\n", ret);
 499                 exit(1);
 500         }
 501         root = open_ctree(file, 0, O_RDWR);
 502         root->fs_info->alloc_start = alloc_start;
 503
 504         ret = make_root_dir(root, mixed);
 505         if (ret) {
 506                 fprintf(stderr, "failed to setup the root directory\n");
 507                 exit(1);
 508         }
 509
 510         trans = btrfs_start_transaction(root, 1);
 511
 512         if (ac == 0)
 513                 goto raid_groups;
 514
 515         btrfs_register_one_device(file);
 516         if (!root) {
 517                 fprintf(stderr, "ctree init failed\n");
 518                 return -1;
 519         }
 520
 521         zero_end = 1;
 522         while(ac-- > 0) {
 523                 int old_mixed = mixed;
 524
 525                 file = av[optind++];
 526                 ret = check_mounted(file);
 527                 if (ret < 0) {
 528                         fprintf(stderr, "error checking %s mount status\n",
 529                                 file);
 530                         exit(1);
 531                 }
 532                 if (ret == 1) {
 533                         fprintf(stderr, "%s is mounted\n", file);
 534                         exit(1);
 535                 }
 536                 fd = open(file, O_RDWR);
 537                 if (fd < 0) {
 538                         fprintf(stderr, "unable to open %s\n", file);
 539                         exit(1);
 540                 }
 541                 ret = btrfs_device_already_in_root(root, fd,
 542                                                    BTRFS_SUPER_INFO_OFFSET);
 543                 if (ret) {
 544                         fprintf(stderr, "skipping duplicate device %s in FS\n",
 545                                 file);
 546                         close(fd);
 547                         continue;
 548                 }
 549                 ret = btrfs_prepare_device(fd, file, zero_end,
 550                                            &dev_block_count, &mixed);
 551                 mixed = old_mixed;
 552                 BUG_ON(ret);
 553
 554                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
 555                                         sectorsize, sectorsize, sectorsize);
 556                 BUG_ON(ret);
 557                 btrfs_register_one_device(file);
 558         }
 559
 560 raid_groups:
 561         ret = create_raid_groups(trans, root, data_profile,
 562                                  metadata_profile, mixed);
 563         BUG_ON(ret);
 564
 565         ret = create_data_reloc_tree(trans, root);
 566         BUG_ON(ret);
 567
 568         if (mixed) {
 569                 struct btrfs_super_block *super = &root->fs_info->super_copy;
 570                 u64 flags = btrfs_super_incompat_flags(super);
 571
 572                 flags |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
 573                 btrfs_set_super_incompat_flags(super, flags);
 574         }
 575
 576         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
 577             "sectorsize %u size %s\n",
 578             label, first_file, nodesize, leafsize, sectorsize,
 579             pretty_sizes(btrfs_super_total_bytes(&root->fs_info->super_copy)));
 580
 581         printf("%s\n", BTRFS_BUILD_VERSION);
 582         btrfs_commit_transaction(trans, root);
 583         ret = close_ctree(root);
 584         BUG_ON(ret);
 585
 586         free(label);
 587         return 0;
 588 }
 589