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 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <getopt.h>
  28 #include <uuid/uuid.h>
  29 #include <linux/fs.h>
  30 #include <ctype.h>
  31 #include "kerncompat.h"
  32 #include "ctree.h"
  33 #include "disk-io.h"
  34 #include "volumes.h"
  35 #include "transaction.h"
  36 #include "utils.h"
  37
  38 static u64 parse_size(char *s)
  39 {
  40         int len = strlen(s);
  41         char c;
  42         u64 mult = 1;
  43
  44         if (!isdigit(s[len - 1])) {
  45                 c = tolower(s[len - 1]);
  46                 switch (c) {
  47                 case 'g':
  48                         mult *= 1024;
  49                 case 'm':
  50                         mult *= 1024;
  51                 case 'k':
  52                         mult *= 1024;
  53                 case 'b':
  54                         break;
  55                 default:
  56                         fprintf(stderr, "Unknown size descriptor %c\n", c);
  57                         exit(1);
  58                 }
  59                 s[len - 1] = '\0';
  60         }
  61         return atol(s) * mult;
  62 }
  63
  64 static int make_root_dir(int fd, const char *device_name) {
  65         struct btrfs_root *root;
  66         struct btrfs_trans_handle *trans;
  67         struct btrfs_key location;
  68         u64 bytes_used;
  69         u64 chunk_start = 0;
  70         u64 chunk_size = 0;
  71         int ret;
  72
  73         root = open_ctree_fd(fd, device_name, 0);
  74
  75         if (!root) {
  76                 fprintf(stderr, "ctree init failed\n");
  77                 return -1;
  78         }
  79         trans = btrfs_start_transaction(root, 1);
  80         bytes_used = btrfs_super_bytes_used(&root->fs_info->super_copy);
  81
  82         root->fs_info->force_system_allocs = 1;
  83         ret = btrfs_make_block_group(trans, root, bytes_used,
  84                                      BTRFS_BLOCK_GROUP_SYSTEM,
  85                                      BTRFS_CHUNK_TREE_OBJECTID,
  86                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  87         BUG_ON(ret);
  88         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  89                                 &chunk_start, &chunk_size,
  90                                 BTRFS_BLOCK_GROUP_METADATA);
  91         BUG_ON(ret);
  92         ret = btrfs_make_block_group(trans, root, 0,
  93                                      BTRFS_BLOCK_GROUP_METADATA,
  94                                      BTRFS_CHUNK_TREE_OBJECTID,
  95                                      chunk_start, chunk_size);
  96         BUG_ON(ret);
  97
  98         root->fs_info->force_system_allocs = 0;
  99         btrfs_commit_transaction(trans, root);
 100         trans = btrfs_start_transaction(root, 1);
 101         BUG_ON(!trans);
 102
 103         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 104                                 &chunk_start, &chunk_size,
 105                                 BTRFS_BLOCK_GROUP_DATA);
 106         BUG_ON(ret);
 107         ret = btrfs_make_block_group(trans, root, 0,
 108                                      BTRFS_BLOCK_GROUP_DATA,
 109                                      BTRFS_CHUNK_TREE_OBJECTID,
 110                                      chunk_start, chunk_size);
 111         BUG_ON(ret);
 112
 113         // ret = btrfs_make_block_group(trans, root, 0, 1);
 114         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 115                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 116         if (ret)
 117                 goto err;
 118         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 119         if (ret)
 120                 goto err;
 121         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 122         location.offset = (u64)-1;
 123         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 124                         "default", 7,
 125                         btrfs_super_root_dir(&root->fs_info->super_copy),
 126                         &location, BTRFS_FT_DIR);
 127         if (ret)
 128                 goto err;
 129
 130         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 131                              "default", 7, location.objectid,
 132                              BTRFS_ROOT_TREE_DIR_OBJECTID);
 133         if (ret)
 134                 goto err;
 135
 136         btrfs_commit_transaction(trans, root);
 137         ret = close_ctree(root);
 138 err:
 139         return ret;
 140 }
 141
 142 static int recow_roots(struct btrfs_trans_handle *trans,
 143                        struct btrfs_root *root)
 144 {
 145         int ret;
 146         struct extent_buffer *tmp;
 147         struct btrfs_fs_info *info = root->fs_info;
 148
 149         ret = __btrfs_cow_block(trans, info->fs_root, info->fs_root->node,
 150                                 NULL, 0, &tmp, 0, 0);
 151         BUG_ON(ret);
 152         free_extent_buffer(tmp);
 153
 154         ret = __btrfs_cow_block(trans, info->tree_root, info->tree_root->node,
 155                                 NULL, 0, &tmp, 0, 0);
 156         BUG_ON(ret);
 157         free_extent_buffer(tmp);
 158
 159         ret = __btrfs_cow_block(trans, info->extent_root,
 160                                 info->extent_root->node, NULL, 0, &tmp, 0, 0);
 161         BUG_ON(ret);
 162         free_extent_buffer(tmp);
 163
 164         ret = __btrfs_cow_block(trans, info->chunk_root, info->chunk_root->node,
 165                                 NULL, 0, &tmp, 0, 0);
 166         BUG_ON(ret);
 167         free_extent_buffer(tmp);
 168
 169
 170         ret = __btrfs_cow_block(trans, info->dev_root, info->dev_root->node,
 171                                 NULL, 0, &tmp, 0, 0);
 172         BUG_ON(ret);
 173         free_extent_buffer(tmp);
 174
 175         return 0;
 176 }
 177
 178 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 179                               struct btrfs_root *root, u64 type)
 180 {
 181         u64 chunk_start;
 182         u64 chunk_size;
 183         int ret;
 184
 185         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 186                                 &chunk_start, &chunk_size, type);
 187         BUG_ON(ret);
 188         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 189                                      type, BTRFS_CHUNK_TREE_OBJECTID,
 190                                      chunk_start, chunk_size);
 191         BUG_ON(ret);
 192         return ret;
 193 }
 194
 195 static int create_raid_groups(struct btrfs_trans_handle *trans,
 196                               struct btrfs_root *root, u64 data_profile,
 197                               u64 metadata_profile)
 198 {
 199         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 200         u64 allowed;
 201         int ret;
 202
 203         if (num_devices == 1)
 204                 allowed = BTRFS_BLOCK_GROUP_DUP;
 205         else
 206                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 207
 208         if (allowed & metadata_profile) {
 209                 ret = create_one_raid_group(trans, root,
 210                                             BTRFS_BLOCK_GROUP_SYSTEM |
 211                                             (allowed & metadata_profile));
 212                 BUG_ON(ret);
 213
 214                 ret = create_one_raid_group(trans, root,
 215                                             BTRFS_BLOCK_GROUP_METADATA |
 216                                             (allowed & metadata_profile));
 217                 BUG_ON(ret);
 218
 219                 ret = recow_roots(trans, root);
 220                 BUG_ON(ret);
 221         }
 222         if (num_devices > 1 && (allowed & data_profile)) {
 223                 ret = create_one_raid_group(trans, root,
 224                                             BTRFS_BLOCK_GROUP_DATA |
 225                                             (allowed & data_profile));
 226                 BUG_ON(ret);
 227         }
 228         return 0;
 229 }
 230
 231 static void print_usage(void)
 232 {
 233         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 234         fprintf(stderr, "options:\n");
 235         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 236         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 237         fprintf(stderr, "\t -n --nodesize size of btree leaves\n");
 238         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 239         exit(1);
 240 }
 241
 242 static u64 parse_profile(char *s)
 243 {
 244         if (strcmp(s, "raid0") == 0) {
 245                 return BTRFS_BLOCK_GROUP_RAID0;
 246         } else if (strcmp(s, "raid1") == 0) {
 247                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 248         } else if (strcmp(s, "single") == 0) {
 249                 return 0;
 250         } else {
 251                 fprintf(stderr, "Unknown option %s\n", s);
 252                 print_usage();
 253         }
 254         return 0;
 255 }
 256
 257 static struct option long_options[] = {
 258         { "byte-count", 1, NULL, 'b' },
 259         { "leafsize", 1, NULL, 'l' },
 260         { "nodesize", 1, NULL, 'n' },
 261         { "sectorsize", 1, NULL, 's' },
 262         { "metadata", 1, NULL, 'm' },
 263         { "data", 1, NULL, 'd' },
 264         { 0, 0, 0, 0}
 265 };
 266
 267 int main(int ac, char **av)
 268 {
 269         char *file;
 270         u64 block_count = 0;
 271         u64 dev_block_count = 0;
 272         int fd;
 273         int first_fd;
 274         int ret;
 275         int i;
 276         u32 leafsize = getpagesize();
 277         u32 sectorsize = 4096;
 278         u32 nodesize = leafsize;
 279         u32 stripesize = 4096;
 280         u64 blocks[6];
 281         int zero_end = 1;
 282         int option_index = 0;
 283         struct btrfs_root *root;
 284         struct btrfs_trans_handle *trans;
 285         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 286         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 287
 288         while(1) {
 289                 int c;
 290                 c = getopt_long(ac, av, "b:l:n:s:m:d:", long_options,
 291                                 &option_index);
 292                 if (c < 0)
 293                         break;
 294                 switch(c) {
 295                         case 'd':
 296                                 data_profile = parse_profile(optarg);
 297                                 break;
 298                         case 'm':
 299                                 metadata_profile = parse_profile(optarg);
 300                                 break;
 301                         case 'l':
 302                                 leafsize = parse_size(optarg);
 303                                 break;
 304                         case 'n':
 305                                 nodesize = parse_size(optarg);
 306                                 break;
 307                         case 's':
 308                                 sectorsize = parse_size(optarg);
 309                                 break;
 310                         case 'b':
 311                                 block_count = parse_size(optarg);
 312                                 zero_end = 0;
 313                                 break;
 314                         default:
 315                                 print_usage();
 316                 }
 317         }
 318         sectorsize = max(sectorsize, (u32)getpagesize());
 319         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 320                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 321                 exit(1);
 322         }
 323         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 324                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 325                 exit(1);
 326         }
 327         ac = ac - optind;
 328         if (ac == 0)
 329                 print_usage();
 330
 331         file = av[optind++];
 332         ret = check_mounted(file);
 333         if (ret < 0) {
 334                 fprintf(stderr, "error checking %s mount status\n", file);
 335                 exit(1);
 336         }
 337         if (ret == 1) {
 338                 fprintf(stderr, "%s is mounted\n", file);
 339                 exit(1);
 340         }
 341         ac--;
 342         fd = open(file, O_RDWR);
 343         if (fd < 0) {
 344                 fprintf(stderr, "unable to open %s\n", file);
 345                 exit(1);
 346         }
 347         first_fd = fd;
 348         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 349         if (block_count == 0)
 350                 block_count = dev_block_count;
 351
 352         for (i = 0; i < 6; i++)
 353                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 354
 355         ret = make_btrfs(fd, file, blocks, block_count, nodesize, leafsize,
 356                          sectorsize, stripesize);
 357         if (ret) {
 358                 fprintf(stderr, "error during mkfs %d\n", ret);
 359                 exit(1);
 360         }
 361         ret = make_root_dir(fd, file);
 362         if (ret) {
 363                 fprintf(stderr, "failed to setup the root directory\n");
 364                 exit(1);
 365         }
 366         printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
 367                file, nodesize, leafsize, sectorsize,
 368                (unsigned long long)block_count);
 369
 370         root = open_ctree(file, 0);
 371         trans = btrfs_start_transaction(root, 1);
 372
 373         if (ac == 0)
 374                 goto raid_groups;
 375
 376         btrfs_register_one_device(file);
 377         if (!root) {
 378                 fprintf(stderr, "ctree init failed\n");
 379                 return -1;
 380         }
 381
 382         zero_end = 1;
 383         while(ac-- > 0) {
 384                 file = av[optind++];
 385                 ret = check_mounted(file);
 386                 if (ret < 0) {
 387                         fprintf(stderr, "error checking %s mount status\n",
 388                                 file);
 389                         exit(1);
 390                 }
 391                 if (ret == 1) {
 392                         fprintf(stderr, "%s is mounted\n", file);
 393                         exit(1);
 394                 }
 395                 fd = open(file, O_RDWR);
 396                 if (fd < 0) {
 397                         fprintf(stderr, "unable to open %s\n", file);
 398                         exit(1);
 399                 }
 400                 fprintf(stderr, "adding device %s\n", file);
 401                 ret = btrfs_prepare_device(fd, file, zero_end,
 402                                            &dev_block_count);
 403
 404                 BUG_ON(ret);
 405
 406                 ret = btrfs_add_to_fsid(trans, root, fd, dev_block_count,
 407                                         sectorsize, sectorsize, sectorsize);
 408                 BUG_ON(ret);
 409                 btrfs_register_one_device(file);
 410         }
 411
 412 raid_groups:
 413         ret = create_raid_groups(trans, root, data_profile,
 414                                  metadata_profile);
 415         btrfs_commit_transaction(trans, root);
 416         ret = close_ctree(root);
 417         BUG_ON(ret);
 418         return 0;
 419 }
 420