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)
  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         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  92                                 &chunk_start, &chunk_size,
  93                                 BTRFS_BLOCK_GROUP_METADATA);
  94         BUG_ON(ret);
  95         ret = btrfs_make_block_group(trans, root, 0,
  96                                      BTRFS_BLOCK_GROUP_METADATA,
  97                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  98                                      chunk_start, chunk_size);
  99         BUG_ON(ret);
 100
 101         root->fs_info->system_allocs = 0;
 102         btrfs_commit_transaction(trans, root);
 103         trans = btrfs_start_transaction(root, 1);
 104         BUG_ON(!trans);
 105
 106         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 107                                 &chunk_start, &chunk_size,
 108                                 BTRFS_BLOCK_GROUP_DATA);
 109         BUG_ON(ret);
 110         ret = btrfs_make_block_group(trans, root, 0,
 111                                      BTRFS_BLOCK_GROUP_DATA,
 112                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 113                                      chunk_start, chunk_size);
 114         BUG_ON(ret);
 115
 116         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 117                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 118         if (ret)
 119                 goto err;
 120         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 121         if (ret)
 122                 goto err;
 123         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 124         location.offset = (u64)-1;
 125         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 126                         "default", 7,
 127                         btrfs_super_root_dir(&root->fs_info->super_copy),
 128                         &location, BTRFS_FT_DIR, 0);
 129         if (ret)
 130                 goto err;
 131
 132         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 133                              "default", 7, location.objectid,
 134                              BTRFS_ROOT_TREE_DIR_OBJECTID, 0);
 135         if (ret)
 136                 goto err;
 137
 138         btrfs_commit_transaction(trans, root);
 139 err:
 140         return ret;
 141 }
 142
 143 static int recow_roots(struct btrfs_trans_handle *trans,
 144                        struct btrfs_root *root)
 145 {
 146         int ret;
 147         struct extent_buffer *tmp;
 148         struct btrfs_fs_info *info = root->fs_info;
 149
 150         ret = __btrfs_cow_block(trans, info->fs_root, info->fs_root->node,
 151                                 NULL, 0, &tmp, 0, 0);
 152         BUG_ON(ret);
 153         free_extent_buffer(tmp);
 154
 155         ret = __btrfs_cow_block(trans, info->tree_root, info->tree_root->node,
 156                                 NULL, 0, &tmp, 0, 0);
 157         BUG_ON(ret);
 158         free_extent_buffer(tmp);
 159
 160         ret = __btrfs_cow_block(trans, info->extent_root,
 161                                 info->extent_root->node, NULL, 0, &tmp, 0, 0);
 162         BUG_ON(ret);
 163         free_extent_buffer(tmp);
 164
 165         ret = __btrfs_cow_block(trans, info->chunk_root, info->chunk_root->node,
 166                                 NULL, 0, &tmp, 0, 0);
 167         BUG_ON(ret);
 168         free_extent_buffer(tmp);
 169
 170
 171         ret = __btrfs_cow_block(trans, info->dev_root, info->dev_root->node,
 172                                 NULL, 0, &tmp, 0, 0);
 173         BUG_ON(ret);
 174         free_extent_buffer(tmp);
 175
 176         return 0;
 177 }
 178
 179 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 180                               struct btrfs_root *root, u64 type)
 181 {
 182         u64 chunk_start;
 183         u64 chunk_size;
 184         int ret;
 185
 186         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 187                                 &chunk_start, &chunk_size, type);
 188         BUG_ON(ret);
 189         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 190                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 191                                      chunk_start, chunk_size);
 192         BUG_ON(ret);
 193         return ret;
 194 }
 195
 196 static int create_raid_groups(struct btrfs_trans_handle *trans,
 197                               struct btrfs_root *root, u64 data_profile,
 198                               u64 metadata_profile)
 199 {
 200         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 201         u64 allowed;
 202         int ret;
 203
 204         if (num_devices == 1)
 205                 allowed = BTRFS_BLOCK_GROUP_DUP;
 206         else if (num_devices >= 4) {
 207                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 208                         BTRFS_BLOCK_GROUP_RAID10;
 209         } else
 210                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 211
 212         if (allowed & metadata_profile) {
 213                 ret = create_one_raid_group(trans, root,
 214                                             BTRFS_BLOCK_GROUP_SYSTEM |
 215                                             (allowed & metadata_profile));
 216                 BUG_ON(ret);
 217
 218                 ret = create_one_raid_group(trans, root,
 219                                             BTRFS_BLOCK_GROUP_METADATA |
 220                                             (allowed & metadata_profile));
 221                 BUG_ON(ret);
 222
 223                 ret = recow_roots(trans, root);
 224                 BUG_ON(ret);
 225         }
 226         if (num_devices > 1 && (allowed & data_profile)) {
 227                 ret = create_one_raid_group(trans, root,
 228                                             BTRFS_BLOCK_GROUP_DATA |
 229                                             (allowed & data_profile));
 230                 BUG_ON(ret);
 231         }
 232         return 0;
 233 }
 234
 235 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 236                                   struct btrfs_root *root)
 237 {
 238         struct btrfs_key location;
 239         struct btrfs_root_item root_item;
 240         struct extent_buffer *tmp;
 241         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 242         int ret;
 243
 244         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 245         BUG_ON(ret);
 246
 247         memcpy(&root_item, &root->root_item, sizeof(root_item));
 248         btrfs_set_root_bytenr(&root_item, tmp->start);
 249         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 250         btrfs_set_root_generation(&root_item, trans->transid);
 251         free_extent_buffer(tmp);
 252
 253         location.objectid = objectid;
 254         location.type = BTRFS_ROOT_ITEM_KEY;
 255         location.offset = trans->transid;
 256         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 257                                 &location, &root_item);
 258         BUG_ON(ret);
 259         return 0;
 260 }
 261
 262 static void print_usage(void)
 263 {
 264         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 265         fprintf(stderr, "options:\n");
 266         fprintf(stderr, "\t -A --alloc-start the offset to start the FS\n");
 267         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 268         fprintf(stderr, "\t -d --data data profile, raid0, raid1, raid10 or single\n");
 269         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 270         fprintf(stderr, "\t -L --label set a label\n");
 271         fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
 272         fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
 273         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 274         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
 275         exit(1);
 276 }
 277
 278 static void print_version(void)
 279 {
 280         fprintf(stderr, "mkfs.btrfs, part of %s\n", BTRFS_BUILD_VERSION);
 281         exit(0);
 282 }
 283
 284 static u64 parse_profile(char *s)
 285 {
 286         if (strcmp(s, "raid0") == 0) {
 287                 return BTRFS_BLOCK_GROUP_RAID0;
 288         } else if (strcmp(s, "raid1") == 0) {
 289                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 290         } else if (strcmp(s, "raid10") == 0) {
 291                 return BTRFS_BLOCK_GROUP_RAID10 | BTRFS_BLOCK_GROUP_DUP;
 292         } else if (strcmp(s, "single") == 0) {
 293                 return 0;
 294         } else {
 295                 fprintf(stderr, "Unknown option %s\n", s);
 296                 print_usage();
 297         }
 298         return 0;
 299 }
 300
 301 static char *parse_label(char *input)
 302 {
 303         int i;
 304         int len = strlen(input);
 305
 306         if (len > BTRFS_LABEL_SIZE) {
 307                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 308                         BTRFS_LABEL_SIZE);
 309                 exit(1);
 310         }
 311         for (i = 0; i < len; i++) {
 312                 if (input[i] == '/' || input[i] == '\\') {
 313                         fprintf(stderr, "invalid label %s\n", input);
 314                         exit(1);
 315                 }
 316         }
 317         return strdup(input);
 318 }
 319
 320 static struct option long_options[] = {
 321         { "alloc-start", 1, NULL, 'A'},
 322         { "byte-count", 1, NULL, 'b' },
 323         { "leafsize", 1, NULL, 'l' },
 324         { "label", 1, NULL, 'L'},
 325         { "metadata", 1, NULL, 'm' },
 326         { "nodesize", 1, NULL, 'n' },
 327         { "sectorsize", 1, NULL, 's' },
 328         { "data", 1, NULL, 'd' },
 329         { "version", 0, NULL, 'V' },
 330         { 0, 0, 0, 0}
 331 };
 332
 333 int main(int ac, char **av)
 334 {
 335         char *file;
 336         struct btrfs_root *root;
 337         struct btrfs_trans_handle *trans;
 338         char *label = NULL;
 339         char *first_file;
 340         u64 block_count = 0;
 341         u64 dev_block_count = 0;
 342         u64 blocks[7];
 343         u64 alloc_start = 0;
 344         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 345         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 346         u32 leafsize = getpagesize();
 347         u32 sectorsize = 4096;
 348         u32 nodesize = leafsize;
 349         u32 stripesize = 4096;
 350         int zero_end = 1;
 351         int option_index = 0;
 352         int fd;
 353         int first_fd;
 354         int ret;
 355         int i;
 356
 357         while(1) {
 358                 int c;
 359                 c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:V", long_options,
 360                                 &option_index);
 361                 if (c < 0)
 362                         break;
 363                 switch(c) {
 364                         case 'A':
 365                                 alloc_start = parse_size(optarg);
 366                                 break;
 367                         case 'd':
 368                                 data_profile = parse_profile(optarg);
 369                                 break;
 370                         case 'l':
 371                                 leafsize = parse_size(optarg);
 372                                 break;
 373                         case 'L':
 374                                 label = parse_label(optarg);
 375                                 break;
 376                         case 'm':
 377                                 metadata_profile = parse_profile(optarg);
 378                                 break;
 379                         case 'n':
 380                                 nodesize = parse_size(optarg);
 381                                 break;
 382                         case 's':
 383                                 sectorsize = parse_size(optarg);
 384                                 break;
 385                         case 'b':
 386                                 block_count = parse_size(optarg);
 387                                 if (block_count < 256*1024*1024) {
 388                                         fprintf(stderr, "File system size "
 389                                                 "%llu bytes is too small, "
 390                                                 "256M is required at least\n",
 391                                                 (unsigned long long)block_count);
 392                                         exit(1);
 393                                 }
 394                                 zero_end = 0;
 395                                 break;
 396                         case 'V':
 397                                 print_version();
 398                                 break;
 399                         default:
 400                                 print_usage();
 401                 }
 402         }
 403         sectorsize = max(sectorsize, (u32)getpagesize());
 404         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 405                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 406                 exit(1);
 407         }
 408         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 409                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 410                 exit(1);
 411         }
 412         ac = ac - optind;
 413         if (ac == 0)
 414                 print_usage();
 415
 416         printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
 417         printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
 418
 419         file = av[optind++];
 420         ret = check_mounted(file);
 421         if (ret < 0) {
 422                 fprintf(stderr, "error checking %s mount status\n", file);
 423                 exit(1);
 424         }
 425         if (ret == 1) {
 426                 fprintf(stderr, "%s is mounted\n", file);
 427                 exit(1);
 428         }
 429         ac--;
 430         fd = open(file, O_RDWR);
 431         if (fd < 0) {
 432                 fprintf(stderr, "unable to open %s\n", file);
 433                 exit(1);
 434         }
 435         first_fd = fd;
 436         first_file = file;
 437         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 438         if (block_count == 0)
 439                 block_count = dev_block_count;
 440
 441         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
 442         for (i = 1; i < 7; i++) {
 443                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
 444                         leafsize * i;
 445         }
 446
 447         ret = make_btrfs(fd, file, label, blocks, block_count,
 448                          nodesize, leafsize,
 449                          sectorsize, stripesize);
 450         if (ret) {
 451                 fprintf(stderr, "error during mkfs %d\n", ret);
 452                 exit(1);
 453         }
 454         root = open_ctree(file, 0, O_RDWR);
 455         root->fs_info->alloc_start = alloc_start;
 456
 457         ret = make_root_dir(root);
 458         if (ret) {
 459                 fprintf(stderr, "failed to setup the root directory\n");
 460                 exit(1);
 461         }
 462
 463         trans = btrfs_start_transaction(root, 1);
 464
 465         if (ac == 0)
 466                 goto raid_groups;
 467
 468         btrfs_register_one_device(file);
 469         if (!root) {
 470                 fprintf(stderr, "ctree init failed\n");
 471                 return -1;
 472         }
 473
 474         zero_end = 1;
 475         while(ac-- > 0) {
 476                 file = av[optind++];
 477                 ret = check_mounted(file);
 478                 if (ret < 0) {
 479                         fprintf(stderr, "error checking %s mount status\n",
 480                                 file);
 481                         exit(1);
 482                 }
 483                 if (ret == 1) {
 484                         fprintf(stderr, "%s is mounted\n", file);
 485                         exit(1);
 486                 }
 487                 fd = open(file, O_RDWR);
 488                 if (fd < 0) {
 489                         fprintf(stderr, "unable to open %s\n", file);
 490                         exit(1);
 491                 }
 492                 ret = btrfs_device_already_in_root(root, fd,
 493                                                    BTRFS_SUPER_INFO_OFFSET);
 494                 if (ret) {
 495                         fprintf(stderr, "skipping duplicate device %s in FS\n",
 496                                 file);
 497                         close(fd);
 498                         continue;
 499                 }
 500                 ret = btrfs_prepare_device(fd, file, zero_end,
 501                                            &dev_block_count);
 502
 503                 BUG_ON(ret);
 504
 505                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
 506                                         sectorsize, sectorsize, sectorsize);
 507                 BUG_ON(ret);
 508                 btrfs_register_one_device(file);
 509         }
 510
 511 raid_groups:
 512         ret = create_raid_groups(trans, root, data_profile,
 513                                  metadata_profile);
 514         BUG_ON(ret);
 515
 516         ret = create_data_reloc_tree(trans, root);
 517         BUG_ON(ret);
 518
 519         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
 520             "sectorsize %u size %s\n",
 521             label, first_file, nodesize, leafsize, sectorsize,
 522             pretty_sizes(btrfs_super_total_bytes(&root->fs_info->super_copy)));
 523
 524         printf("%s\n", BTRFS_BUILD_VERSION);
 525         btrfs_commit_transaction(trans, root);
 526         ret = close_ctree(root);
 527         BUG_ON(ret);
 528
 529         free(label);
 530         return 0;
 531 }
 532