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_FIRST_CHUNK_TREE_OBJECTID,
  86                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  87         BUG_ON(ret);
  88
  89         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  90                                 &chunk_start, &chunk_size,
  91                                 BTRFS_BLOCK_GROUP_METADATA);
  92         BUG_ON(ret);
  93         ret = btrfs_make_block_group(trans, root, 0,
  94                                      BTRFS_BLOCK_GROUP_METADATA,
  95                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  96                                      chunk_start, chunk_size);
  97         BUG_ON(ret);
  98
  99         root->fs_info->force_system_allocs = 0;
 100         btrfs_commit_transaction(trans, root);
 101         trans = btrfs_start_transaction(root, 1);
 102         BUG_ON(!trans);
 103
 104         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 105                                 &chunk_start, &chunk_size,
 106                                 BTRFS_BLOCK_GROUP_DATA);
 107         BUG_ON(ret);
 108         ret = btrfs_make_block_group(trans, root, 0,
 109                                      BTRFS_BLOCK_GROUP_DATA,
 110                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 111                                      chunk_start, chunk_size);
 112         BUG_ON(ret);
 113
 114         // ret = btrfs_make_block_group(trans, root, 0, 1);
 115         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 116                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 117         if (ret)
 118                 goto err;
 119         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 120         if (ret)
 121                 goto err;
 122         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 123         location.offset = (u64)-1;
 124         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 125                         "default", 7,
 126                         btrfs_super_root_dir(&root->fs_info->super_copy),
 127                         &location, BTRFS_FT_DIR);
 128         if (ret)
 129                 goto err;
 130
 131         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 132                              "default", 7, location.objectid,
 133                              BTRFS_ROOT_TREE_DIR_OBJECTID);
 134         if (ret)
 135                 goto err;
 136
 137         btrfs_commit_transaction(trans, root);
 138         ret = close_ctree(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
 207                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 208
 209         if (allowed & metadata_profile) {
 210                 ret = create_one_raid_group(trans, root,
 211                                             BTRFS_BLOCK_GROUP_SYSTEM |
 212                                             (allowed & metadata_profile));
 213                 BUG_ON(ret);
 214
 215                 ret = create_one_raid_group(trans, root,
 216                                             BTRFS_BLOCK_GROUP_METADATA |
 217                                             (allowed & metadata_profile));
 218                 BUG_ON(ret);
 219
 220                 ret = recow_roots(trans, root);
 221                 BUG_ON(ret);
 222         }
 223         if (num_devices > 1 && (allowed & data_profile)) {
 224                 ret = create_one_raid_group(trans, root,
 225                                             BTRFS_BLOCK_GROUP_DATA |
 226                                             (allowed & data_profile));
 227                 BUG_ON(ret);
 228         }
 229         return 0;
 230 }
 231
 232 static void print_usage(void)
 233 {
 234         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 235         fprintf(stderr, "options:\n");
 236         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 237         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 238         fprintf(stderr, "\t -n --nodesize size of btree leaves\n");
 239         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 240         exit(1);
 241 }
 242
 243 static u64 parse_profile(char *s)
 244 {
 245         if (strcmp(s, "raid0") == 0) {
 246                 return BTRFS_BLOCK_GROUP_RAID0;
 247         } else if (strcmp(s, "raid1") == 0) {
 248                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 249         } else if (strcmp(s, "single") == 0) {
 250                 return 0;
 251         } else {
 252                 fprintf(stderr, "Unknown option %s\n", s);
 253                 print_usage();
 254         }
 255         return 0;
 256 }
 257
 258 static struct option long_options[] = {
 259         { "byte-count", 1, NULL, 'b' },
 260         { "leafsize", 1, NULL, 'l' },
 261         { "nodesize", 1, NULL, 'n' },
 262         { "sectorsize", 1, NULL, 's' },
 263         { "metadata", 1, NULL, 'm' },
 264         { "data", 1, NULL, 'd' },
 265         { 0, 0, 0, 0}
 266 };
 267
 268 int main(int ac, char **av)
 269 {
 270         char *file;
 271         u64 block_count = 0;
 272         u64 dev_block_count = 0;
 273         int fd;
 274         int first_fd;
 275         int ret;
 276         int i;
 277         u32 leafsize = getpagesize();
 278         u32 sectorsize = 4096;
 279         u32 nodesize = leafsize;
 280         u32 stripesize = 4096;
 281         u64 blocks[6];
 282         int zero_end = 1;
 283         int option_index = 0;
 284         struct btrfs_root *root;
 285         struct btrfs_trans_handle *trans;
 286         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 287         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 288
 289         while(1) {
 290                 int c;
 291                 c = getopt_long(ac, av, "b:l:n:s:m:d:", long_options,
 292                                 &option_index);
 293                 if (c < 0)
 294                         break;
 295                 switch(c) {
 296                         case 'd':
 297                                 data_profile = parse_profile(optarg);
 298                                 break;
 299                         case 'm':
 300                                 metadata_profile = parse_profile(optarg);
 301                                 break;
 302                         case 'l':
 303                                 leafsize = parse_size(optarg);
 304                                 break;
 305                         case 'n':
 306                                 nodesize = parse_size(optarg);
 307                                 break;
 308                         case 's':
 309                                 sectorsize = parse_size(optarg);
 310                                 break;
 311                         case 'b':
 312                                 block_count = parse_size(optarg);
 313                                 zero_end = 0;
 314                                 break;
 315                         default:
 316                                 print_usage();
 317                 }
 318         }
 319         sectorsize = max(sectorsize, (u32)getpagesize());
 320         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 321                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 322                 exit(1);
 323         }
 324         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 325                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 326                 exit(1);
 327         }
 328         ac = ac - optind;
 329         if (ac == 0)
 330                 print_usage();
 331
 332         file = av[optind++];
 333         ret = check_mounted(file);
 334         if (ret < 0) {
 335                 fprintf(stderr, "error checking %s mount status\n", file);
 336                 exit(1);
 337         }
 338         if (ret == 1) {
 339                 fprintf(stderr, "%s is mounted\n", file);
 340                 exit(1);
 341         }
 342         ac--;
 343         fd = open(file, O_RDWR);
 344         if (fd < 0) {
 345                 fprintf(stderr, "unable to open %s\n", file);
 346                 exit(1);
 347         }
 348         first_fd = fd;
 349         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 350         if (block_count == 0)
 351                 block_count = dev_block_count;
 352
 353         for (i = 0; i < 6; i++)
 354                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 355
 356         ret = make_btrfs(fd, file, blocks, block_count, nodesize, leafsize,
 357                          sectorsize, stripesize);
 358         if (ret) {
 359                 fprintf(stderr, "error during mkfs %d\n", ret);
 360                 exit(1);
 361         }
 362         ret = make_root_dir(fd, file);
 363         if (ret) {
 364                 fprintf(stderr, "failed to setup the root directory\n");
 365                 exit(1);
 366         }
 367         printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
 368                file, nodesize, leafsize, sectorsize,
 369                (unsigned long long)block_count);
 370
 371         root = open_ctree(file, 0);
 372         trans = btrfs_start_transaction(root, 1);
 373
 374         if (ac == 0)
 375                 goto raid_groups;
 376
 377         btrfs_register_one_device(file);
 378         if (!root) {
 379                 fprintf(stderr, "ctree init failed\n");
 380                 return -1;
 381         }
 382
 383         zero_end = 1;
 384         while(ac-- > 0) {
 385                 file = av[optind++];
 386                 ret = check_mounted(file);
 387                 if (ret < 0) {
 388                         fprintf(stderr, "error checking %s mount status\n",
 389                                 file);
 390                         exit(1);
 391                 }
 392                 if (ret == 1) {
 393                         fprintf(stderr, "%s is mounted\n", file);
 394                         exit(1);
 395                 }
 396                 fd = open(file, O_RDWR);
 397                 if (fd < 0) {
 398                         fprintf(stderr, "unable to open %s\n", file);
 399                         exit(1);
 400                 }
 401                 fprintf(stderr, "adding device %s\n", file);
 402                 ret = btrfs_prepare_device(fd, file, zero_end,
 403                                            &dev_block_count);
 404
 405                 BUG_ON(ret);
 406
 407                 ret = btrfs_add_to_fsid(trans, root, fd, dev_block_count,
 408                                         sectorsize, sectorsize, sectorsize);
 409                 BUG_ON(ret);
 410                 btrfs_register_one_device(file);
 411         }
 412
 413 raid_groups:
 414         ret = create_raid_groups(trans, root, data_profile,
 415                                  metadata_profile);
 416         btrfs_commit_transaction(trans, root);
 417         ret = close_ctree(root);
 418         BUG_ON(ret);
 419         return 0;
 420 }
 421