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 create_one_raid_group(struct btrfs_trans_handle *trans,
 143                               struct btrfs_root *root, u64 type)
 144 {
 145         u64 chunk_start;
 146         u64 chunk_size;
 147         int ret;
 148
 149         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 150                                 &chunk_start, &chunk_size, type);
 151         BUG_ON(ret);
 152         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 153                                      type, BTRFS_CHUNK_TREE_OBJECTID,
 154                                      chunk_start, chunk_size);
 155         BUG_ON(ret);
 156         return ret;
 157 }
 158
 159 static int create_raid_groups(struct btrfs_trans_handle *trans,
 160                               struct btrfs_root *root, u64 data_profile,
 161                               u64 metadata_profile)
 162 {
 163         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 164         u64 allowed;
 165         int ret;
 166
 167         if (num_devices == 1)
 168                 allowed = BTRFS_BLOCK_GROUP_DUP;
 169         else
 170                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 171
 172         if (allowed & metadata_profile) {
 173                 ret = create_one_raid_group(trans, root,
 174                                             BTRFS_BLOCK_GROUP_METADATA |
 175                                             (allowed & metadata_profile));
 176                 BUG_ON(ret);
 177         }
 178         if (num_devices > 1 && (allowed & data_profile)) {
 179                 ret = create_one_raid_group(trans, root,
 180                                             BTRFS_BLOCK_GROUP_DATA |
 181                                             (allowed & data_profile));
 182                 BUG_ON(ret);
 183         }
 184         return 0;
 185 }
 186
 187 static void print_usage(void)
 188 {
 189         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 190         fprintf(stderr, "options:\n");
 191         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 192         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 193         fprintf(stderr, "\t -n --nodesize size of btree leaves\n");
 194         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 195         exit(1);
 196 }
 197
 198 static u64 parse_profile(char *s)
 199 {
 200         if (strcmp(s, "raid0") == 0) {
 201                 return BTRFS_BLOCK_GROUP_RAID0;
 202         } else if (strcmp(s, "raid1") == 0) {
 203                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 204         } else if (strcmp(s, "single") == 0) {
 205                 return 0;
 206         } else {
 207                 fprintf(stderr, "Unknown option %s\n", s);
 208                 print_usage();
 209         }
 210         return 0;
 211 }
 212
 213 static struct option long_options[] = {
 214         { "byte-count", 1, NULL, 'b' },
 215         { "leafsize", 1, NULL, 'l' },
 216         { "nodesize", 1, NULL, 'n' },
 217         { "sectorsize", 1, NULL, 's' },
 218         { "metadata", 1, NULL, 'm' },
 219         { "data", 1, NULL, 'd' },
 220         { 0, 0, 0, 0}
 221 };
 222
 223 int main(int ac, char **av)
 224 {
 225         char *file;
 226         u64 block_count = 0;
 227         u64 dev_block_count = 0;
 228         int fd;
 229         int first_fd;
 230         int ret;
 231         int i;
 232         u32 leafsize = 16 * 1024;
 233         u32 sectorsize = 4096;
 234         u32 nodesize = 16 * 1024;
 235         u32 stripesize = 4096;
 236         u64 blocks[6];
 237         int zero_end = 1;
 238         int option_index = 0;
 239         struct btrfs_root *root;
 240         struct btrfs_trans_handle *trans;
 241         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 242         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 243
 244         while(1) {
 245                 int c;
 246                 c = getopt_long(ac, av, "b:l:n:s:m:d:", long_options,
 247                                 &option_index);
 248                 if (c < 0)
 249                         break;
 250                 switch(c) {
 251                         case 'd':
 252                                 data_profile = parse_profile(optarg);
 253                                 break;
 254                         case 'm':
 255                                 metadata_profile = parse_profile(optarg);
 256                                 break;
 257                         case 'l':
 258                                 leafsize = parse_size(optarg);
 259                                 break;
 260                         case 'n':
 261                                 nodesize = parse_size(optarg);
 262                                 break;
 263                         case 's':
 264                                 sectorsize = parse_size(optarg);
 265                                 break;
 266                         case 'b':
 267                                 block_count = parse_size(optarg);
 268                                 zero_end = 0;
 269                                 break;
 270                         default:
 271                                 print_usage();
 272                 }
 273         }
 274         sectorsize = max(sectorsize, (u32)getpagesize());
 275         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 276                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 277                 exit(1);
 278         }
 279         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 280                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 281                 exit(1);
 282         }
 283         ac = ac - optind;
 284         if (ac == 0)
 285                 print_usage();
 286
 287         file = av[optind++];
 288         ret = check_mounted(file);
 289         if (ret < 0) {
 290                 fprintf(stderr, "error checking %s mount status\n", file);
 291                 exit(1);
 292         }
 293         if (ret == 1) {
 294                 fprintf(stderr, "%s is mounted\n", file);
 295                 exit(1);
 296         }
 297         ac--;
 298         fd = open(file, O_RDWR);
 299         if (fd < 0) {
 300                 fprintf(stderr, "unable to open %s\n", file);
 301                 exit(1);
 302         }
 303         first_fd = fd;
 304         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 305         if (block_count == 0)
 306                 block_count = dev_block_count;
 307
 308         for (i = 0; i < 6; i++)
 309                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 310
 311         ret = make_btrfs(fd, file, blocks, block_count, nodesize, leafsize,
 312                          sectorsize, stripesize);
 313         if (ret) {
 314                 fprintf(stderr, "error during mkfs %d\n", ret);
 315                 exit(1);
 316         }
 317         ret = make_root_dir(fd, file);
 318         if (ret) {
 319                 fprintf(stderr, "failed to setup the root directory\n");
 320                 exit(1);
 321         }
 322         printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
 323                file, nodesize, leafsize, sectorsize,
 324                (unsigned long long)block_count);
 325
 326         root = open_ctree(file, 0);
 327         trans = btrfs_start_transaction(root, 1);
 328
 329         if (ac == 0)
 330                 goto raid_groups;
 331
 332         btrfs_register_one_device(file);
 333         if (!root) {
 334                 fprintf(stderr, "ctree init failed\n");
 335                 return -1;
 336         }
 337
 338         zero_end = 1;
 339         while(ac-- > 0) {
 340                 file = av[optind++];
 341                 ret = check_mounted(file);
 342                 if (ret < 0) {
 343                         fprintf(stderr, "error checking %s mount status\n",
 344                                 file);
 345                         exit(1);
 346                 }
 347                 if (ret == 1) {
 348                         fprintf(stderr, "%s is mounted\n", file);
 349                         exit(1);
 350                 }
 351                 fd = open(file, O_RDWR);
 352                 if (fd < 0) {
 353                         fprintf(stderr, "unable to open %s\n", file);
 354                         exit(1);
 355                 }
 356                 fprintf(stderr, "adding device %s\n", file);
 357                 ret = btrfs_prepare_device(fd, file, zero_end,
 358                                            &dev_block_count);
 359
 360                 BUG_ON(ret);
 361
 362                 ret = btrfs_add_to_fsid(trans, root, fd, dev_block_count,
 363                                         sectorsize, sectorsize, sectorsize);
 364                 BUG_ON(ret);
 365                 close(fd);
 366                 btrfs_register_one_device(file);
 367         }
 368
 369 raid_groups:
 370         ret = create_raid_groups(trans, root, data_profile,
 371                                  metadata_profile);
 372         btrfs_commit_transaction(trans, root);
 373         ret = close_ctree(root);
 374         BUG_ON(ret);
 375         return 0;
 376 }
 377