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         ret = __btrfs_cow_block(trans, info->csum_root, info->csum_root->node,
 177                                 NULL, 0, &tmp, 0, 0);
 178         BUG_ON(ret);
 179         free_extent_buffer(tmp);
 180
 181         return 0;
 182 }
 183
 184 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 185                               struct btrfs_root *root, u64 type)
 186 {
 187         u64 chunk_start;
 188         u64 chunk_size;
 189         int ret;
 190
 191         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 192                                 &chunk_start, &chunk_size, type);
 193         BUG_ON(ret);
 194         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 195                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 196                                      chunk_start, chunk_size);
 197         BUG_ON(ret);
 198         return ret;
 199 }
 200
 201 static int create_raid_groups(struct btrfs_trans_handle *trans,
 202                               struct btrfs_root *root, u64 data_profile,
 203                               u64 metadata_profile)
 204 {
 205         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 206         u64 allowed;
 207         int ret;
 208
 209         if (num_devices == 1)
 210                 allowed = BTRFS_BLOCK_GROUP_DUP;
 211         else if (num_devices >= 4) {
 212                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 213                         BTRFS_BLOCK_GROUP_RAID10;
 214         } else
 215                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 216
 217         if (allowed & metadata_profile) {
 218                 ret = create_one_raid_group(trans, root,
 219                                             BTRFS_BLOCK_GROUP_SYSTEM |
 220                                             (allowed & metadata_profile));
 221                 BUG_ON(ret);
 222
 223                 ret = create_one_raid_group(trans, root,
 224                                             BTRFS_BLOCK_GROUP_METADATA |
 225                                             (allowed & metadata_profile));
 226                 BUG_ON(ret);
 227
 228                 ret = recow_roots(trans, root);
 229                 BUG_ON(ret);
 230         }
 231         if (num_devices > 1 && (allowed & data_profile)) {
 232                 ret = create_one_raid_group(trans, root,
 233                                             BTRFS_BLOCK_GROUP_DATA |
 234                                             (allowed & data_profile));
 235                 BUG_ON(ret);
 236         }
 237         return 0;
 238 }
 239
 240 static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 241                                   struct btrfs_root *root)
 242 {
 243         struct btrfs_key location;
 244         struct btrfs_root_item root_item;
 245         struct extent_buffer *tmp;
 246         u64 objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
 247         int ret;
 248
 249         ret = btrfs_copy_root(trans, root, root->node, &tmp, objectid);
 250         BUG_ON(ret);
 251
 252         memcpy(&root_item, &root->root_item, sizeof(root_item));
 253         btrfs_set_root_bytenr(&root_item, tmp->start);
 254         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
 255         btrfs_set_root_generation(&root_item, trans->transid);
 256         free_extent_buffer(tmp);
 257
 258         location.objectid = objectid;
 259         location.type = BTRFS_ROOT_ITEM_KEY;
 260         location.offset = 0;
 261         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
 262                                 &location, &root_item);
 263         BUG_ON(ret);
 264         return 0;
 265 }
 266
 267 static void print_usage(void)
 268 {
 269         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 270         fprintf(stderr, "options:\n");
 271         fprintf(stderr, "\t -A --alloc-start the offset to start the FS\n");
 272         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 273         fprintf(stderr, "\t -d --data data profile, raid0, raid1, raid10 or single\n");
 274         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 275         fprintf(stderr, "\t -L --label set a label\n");
 276         fprintf(stderr, "\t -m --metadata metadata profile, values like data profile\n");
 277         fprintf(stderr, "\t -n --nodesize size of btree nodes\n");
 278         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 279         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
 280         exit(1);
 281 }
 282
 283 static void print_version(void)
 284 {
 285         fprintf(stderr, "mkfs.btrfs, part of %s\n", BTRFS_BUILD_VERSION);
 286         exit(0);
 287 }
 288
 289 static u64 parse_profile(char *s)
 290 {
 291         if (strcmp(s, "raid0") == 0) {
 292                 return BTRFS_BLOCK_GROUP_RAID0;
 293         } else if (strcmp(s, "raid1") == 0) {
 294                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 295         } else if (strcmp(s, "raid10") == 0) {
 296                 return BTRFS_BLOCK_GROUP_RAID10 | BTRFS_BLOCK_GROUP_DUP;
 297         } else if (strcmp(s, "single") == 0) {
 298                 return 0;
 299         } else {
 300                 fprintf(stderr, "Unknown option %s\n", s);
 301                 print_usage();
 302         }
 303         return 0;
 304 }
 305
 306 static char *parse_label(char *input)
 307 {
 308         int i;
 309         int len = strlen(input);
 310
 311         if (len > BTRFS_LABEL_SIZE) {
 312                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 313                         BTRFS_LABEL_SIZE);
 314                 exit(1);
 315         }
 316         for (i = 0; i < len; i++) {
 317                 if (input[i] == '/' || input[i] == '\\') {
 318                         fprintf(stderr, "invalid label %s\n", input);
 319                         exit(1);
 320                 }
 321         }
 322         return strdup(input);
 323 }
 324
 325 static struct option long_options[] = {
 326         { "alloc-start", 1, NULL, 'A'},
 327         { "byte-count", 1, NULL, 'b' },
 328         { "leafsize", 1, NULL, 'l' },
 329         { "label", 1, NULL, 'L'},
 330         { "metadata", 1, NULL, 'm' },
 331         { "nodesize", 1, NULL, 'n' },
 332         { "sectorsize", 1, NULL, 's' },
 333         { "data", 1, NULL, 'd' },
 334         { "version", 0, NULL, 'V' },
 335         { 0, 0, 0, 0}
 336 };
 337
 338 int main(int ac, char **av)
 339 {
 340         char *file;
 341         struct btrfs_root *root;
 342         struct btrfs_trans_handle *trans;
 343         char *label = NULL;
 344         char *first_file;
 345         u64 block_count = 0;
 346         u64 dev_block_count = 0;
 347         u64 blocks[7];
 348         u64 alloc_start = 0;
 349         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 350         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 351         u32 leafsize = getpagesize();
 352         u32 sectorsize = 4096;
 353         u32 nodesize = leafsize;
 354         u32 stripesize = 4096;
 355         int zero_end = 1;
 356         int option_index = 0;
 357         int fd;
 358         int first_fd;
 359         int ret;
 360         int i;
 361
 362         while(1) {
 363                 int c;
 364                 c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:V", long_options,
 365                                 &option_index);
 366                 if (c < 0)
 367                         break;
 368                 switch(c) {
 369                         case 'A':
 370                                 alloc_start = parse_size(optarg);
 371                                 break;
 372                         case 'd':
 373                                 data_profile = parse_profile(optarg);
 374                                 break;
 375                         case 'l':
 376                                 leafsize = parse_size(optarg);
 377                                 break;
 378                         case 'L':
 379                                 label = parse_label(optarg);
 380                                 break;
 381                         case 'm':
 382                                 metadata_profile = parse_profile(optarg);
 383                                 break;
 384                         case 'n':
 385                                 nodesize = parse_size(optarg);
 386                                 break;
 387                         case 's':
 388                                 sectorsize = parse_size(optarg);
 389                                 break;
 390                         case 'b':
 391                                 block_count = parse_size(optarg);
 392                                 if (block_count < 256*1024*1024) {
 393                                         fprintf(stderr, "File system size "
 394                                                 "%llu bytes is too small, "
 395                                                 "256M is required at least\n",
 396                                                 (unsigned long long)block_count);
 397                                         exit(1);
 398                                 }
 399                                 zero_end = 0;
 400                                 break;
 401                         case 'V':
 402                                 print_version();
 403                                 break;
 404                         default:
 405                                 print_usage();
 406                 }
 407         }
 408         sectorsize = max(sectorsize, (u32)getpagesize());
 409         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 410                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 411                 exit(1);
 412         }
 413         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 414                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 415                 exit(1);
 416         }
 417         ac = ac - optind;
 418         if (ac == 0)
 419                 print_usage();
 420
 421         printf("\nWARNING! - %s IS EXPERIMENTAL\n", BTRFS_BUILD_VERSION);
 422         printf("WARNING! - see http://btrfs.wiki.kernel.org before using\n\n");
 423
 424         file = av[optind++];
 425         ret = check_mounted(file);
 426         if (ret < 0) {
 427                 fprintf(stderr, "error checking %s mount status\n", file);
 428                 exit(1);
 429         }
 430         if (ret == 1) {
 431                 fprintf(stderr, "%s is mounted\n", file);
 432                 exit(1);
 433         }
 434         ac--;
 435         fd = open(file, O_RDWR);
 436         if (fd < 0) {
 437                 fprintf(stderr, "unable to open %s\n", file);
 438                 exit(1);
 439         }
 440         first_fd = fd;
 441         first_file = file;
 442         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 443         if (block_count == 0)
 444                 block_count = dev_block_count;
 445
 446         blocks[0] = BTRFS_SUPER_INFO_OFFSET;
 447         for (i = 1; i < 7; i++) {
 448                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + 1024 * 1024 +
 449                         leafsize * i;
 450         }
 451
 452         ret = make_btrfs(fd, file, label, blocks, block_count,
 453                          nodesize, leafsize,
 454                          sectorsize, stripesize);
 455         if (ret) {
 456                 fprintf(stderr, "error during mkfs %d\n", ret);
 457                 exit(1);
 458         }
 459         root = open_ctree(file, 0, O_RDWR);
 460         root->fs_info->alloc_start = alloc_start;
 461
 462         ret = make_root_dir(root);
 463         if (ret) {
 464                 fprintf(stderr, "failed to setup the root directory\n");
 465                 exit(1);
 466         }
 467
 468         trans = btrfs_start_transaction(root, 1);
 469
 470         if (ac == 0)
 471                 goto raid_groups;
 472
 473         btrfs_register_one_device(file);
 474         if (!root) {
 475                 fprintf(stderr, "ctree init failed\n");
 476                 return -1;
 477         }
 478
 479         zero_end = 1;
 480         while(ac-- > 0) {
 481                 file = av[optind++];
 482                 ret = check_mounted(file);
 483                 if (ret < 0) {
 484                         fprintf(stderr, "error checking %s mount status\n",
 485                                 file);
 486                         exit(1);
 487                 }
 488                 if (ret == 1) {
 489                         fprintf(stderr, "%s is mounted\n", file);
 490                         exit(1);
 491                 }
 492                 fd = open(file, O_RDWR);
 493                 if (fd < 0) {
 494                         fprintf(stderr, "unable to open %s\n", file);
 495                         exit(1);
 496                 }
 497                 ret = btrfs_device_already_in_root(root, fd,
 498                                                    BTRFS_SUPER_INFO_OFFSET);
 499                 if (ret) {
 500                         fprintf(stderr, "skipping duplicate device %s in FS\n",
 501                                 file);
 502                         close(fd);
 503                         continue;
 504                 }
 505                 ret = btrfs_prepare_device(fd, file, zero_end,
 506                                            &dev_block_count);
 507
 508                 BUG_ON(ret);
 509
 510                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
 511                                         sectorsize, sectorsize, sectorsize);
 512                 BUG_ON(ret);
 513                 btrfs_register_one_device(file);
 514         }
 515
 516 raid_groups:
 517         ret = create_raid_groups(trans, root, data_profile,
 518                                  metadata_profile);
 519         BUG_ON(ret);
 520
 521         ret = create_data_reloc_tree(trans, root);
 522         BUG_ON(ret);
 523
 524         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
 525             "sectorsize %u size %s\n",
 526             label, first_file, nodesize, leafsize, sectorsize,
 527             pretty_sizes(btrfs_super_total_bytes(&root->fs_info->super_copy)));
 528
 529         printf("%s\n", BTRFS_BUILD_VERSION);
 530         btrfs_commit_transaction(trans, root);
 531         ret = close_ctree(root);
 532         BUG_ON(ret);
 533
 534         free(label);
 535         return 0;
 536 }
 537