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 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <uuid/uuid.h>
  27 #include <linux/fs.h>
  28 #include <ctype.h>
  29 #include "kerncompat.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "volumes.h"
  33 #include "transaction.h"
  34 #include "utils.h"
  35
  36 static u64 parse_size(char *s)
  37 {
  38         int len = strlen(s);
  39         char c;
  40         u64 mult = 1;
  41
  42         if (!isdigit(s[len - 1])) {
  43                 c = tolower(s[len - 1]);
  44                 switch (c) {
  45                 case 'g':
  46                         mult *= 1024;
  47                 case 'm':
  48                         mult *= 1024;
  49                 case 'k':
  50                         mult *= 1024;
  51                 case 'b':
  52                         break;
  53                 default:
  54                         fprintf(stderr, "Unknown size descriptor %c\n", c);
  55                         exit(1);
  56                 }
  57                 s[len - 1] = '\0';
  58         }
  59         return atol(s) * mult;
  60 }
  61
  62 static int make_root_dir(int fd, const char *device_name) {
  63         struct btrfs_root *root;
  64         struct btrfs_trans_handle *trans;
  65         struct btrfs_key location;
  66         u64 bytes_used;
  67         u64 chunk_start = 0;
  68         u64 chunk_size = 0;
  69         int ret;
  70
  71         root = open_ctree_fd(fd, device_name, 0);
  72
  73         if (!root) {
  74                 fprintf(stderr, "ctree init failed\n");
  75                 return -1;
  76         }
  77         trans = btrfs_start_transaction(root, 1);
  78         bytes_used = btrfs_super_bytes_used(&root->fs_info->super_copy);
  79
  80         root->fs_info->force_system_allocs = 1;
  81         ret = btrfs_make_block_group(trans, root, bytes_used,
  82                                      BTRFS_BLOCK_GROUP_SYSTEM,
  83                                      BTRFS_CHUNK_TREE_OBJECTID,
  84                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  85         BUG_ON(ret);
  86         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  87                                 &chunk_start, &chunk_size,
  88                                 BTRFS_BLOCK_GROUP_METADATA);
  89         BUG_ON(ret);
  90         ret = btrfs_make_block_group(trans, root, 0,
  91                                      BTRFS_BLOCK_GROUP_METADATA,
  92                                      BTRFS_CHUNK_TREE_OBJECTID,
  93                                      chunk_start, chunk_size);
  94         BUG_ON(ret);
  95
  96         root->fs_info->force_system_allocs = 0;
  97         btrfs_commit_transaction(trans, root);
  98         trans = btrfs_start_transaction(root, 1);
  99         BUG_ON(!trans);
 100
 101         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 102                                 &chunk_start, &chunk_size,
 103                                 BTRFS_BLOCK_GROUP_DATA);
 104         BUG_ON(ret);
 105         ret = btrfs_make_block_group(trans, root, 0,
 106                                      BTRFS_BLOCK_GROUP_DATA,
 107                                      BTRFS_CHUNK_TREE_OBJECTID,
 108                                      chunk_start, chunk_size);
 109         BUG_ON(ret);
 110
 111         // ret = btrfs_make_block_group(trans, root, 0, 1);
 112         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 113                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 114         if (ret)
 115                 goto err;
 116         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 117         if (ret)
 118                 goto err;
 119         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 120         location.offset = (u64)-1;
 121         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 122                         "default", 7,
 123                         btrfs_super_root_dir(&root->fs_info->super_copy),
 124                         &location, BTRFS_FT_DIR);
 125         if (ret)
 126                 goto err;
 127
 128         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 129                              "default", 7, location.objectid,
 130                              BTRFS_ROOT_TREE_DIR_OBJECTID);
 131         if (ret)
 132                 goto err;
 133
 134         btrfs_commit_transaction(trans, root);
 135         ret = close_ctree(root);
 136 err:
 137         return ret;
 138 }
 139
 140 static void print_usage(void)
 141 {
 142         fprintf(stderr, "usage: mkfs.btrfs [ -l leafsize ] [ -n nodesize] dev [ blocks ]\n");
 143         exit(1);
 144 }
 145
 146 int main(int ac, char **av)
 147 {
 148         char *file;
 149         u64 block_count = 0;
 150         u64 dev_block_count = 0;
 151         int fd;
 152         int first_fd;
 153         int ret;
 154         int i;
 155         u32 leafsize = 16 * 1024;
 156         u32 sectorsize = 4096;
 157         u32 nodesize = 16 * 1024;
 158         u32 stripesize = 4096;
 159         u64 blocks[6];
 160         int zero_end = 1;
 161         struct btrfs_root *root;
 162         struct btrfs_trans_handle *trans;
 163
 164         while(1) {
 165                 int c;
 166                 c = getopt(ac, av, "b:l:n:s:");
 167                 if (c < 0)
 168                         break;
 169                 switch(c) {
 170                         case 'l':
 171                                 leafsize = parse_size(optarg);
 172                                 break;
 173                         case 'n':
 174                                 nodesize = parse_size(optarg);
 175                                 break;
 176                         case 's':
 177                                 stripesize = parse_size(optarg);
 178                                 break;
 179                         case 'b':
 180                                 block_count = parse_size(optarg);
 181                                 zero_end = 0;
 182                                 break;
 183                         default:
 184                                 print_usage();
 185                 }
 186         }
 187         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 188                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 189                 exit(1);
 190         }
 191         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 192                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 193                 exit(1);
 194         }
 195         ac = ac - optind;
 196         if (ac == 0)
 197                 print_usage();
 198
 199         file = av[optind++];
 200         ac--;
 201         fd = open(file, O_RDWR);
 202         if (fd < 0) {
 203                 fprintf(stderr, "unable to open %s\n", file);
 204                 exit(1);
 205         }
 206         first_fd = fd;
 207         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 208         if (block_count == 0)
 209                 block_count = dev_block_count;
 210
 211         for (i = 0; i < 6; i++)
 212                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 213
 214         ret = make_btrfs(fd, file, blocks, block_count, nodesize, leafsize,
 215                          sectorsize, stripesize);
 216         if (ret) {
 217                 fprintf(stderr, "error during mkfs %d\n", ret);
 218                 exit(1);
 219         }
 220         ret = make_root_dir(fd, file);
 221         if (ret) {
 222                 fprintf(stderr, "failed to setup the root directory\n");
 223                 exit(1);
 224         }
 225         printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
 226                file, nodesize, leafsize, sectorsize,
 227                (unsigned long long)block_count);
 228
 229         if (ac == 0)
 230                 goto done;
 231
 232         btrfs_register_one_device(file);
 233         root = open_ctree(file, 0);
 234
 235         if (!root) {
 236                 fprintf(stderr, "ctree init failed\n");
 237                 return -1;
 238         }
 239         trans = btrfs_start_transaction(root, 1);
 240
 241         zero_end = 1;
 242         while(ac-- > 0) {
 243                 file = av[optind++];
 244                 fd = open(file, O_RDWR);
 245                 if (fd < 0) {
 246                         fprintf(stderr, "unable to open %s\n", file);
 247                         exit(1);
 248                 }
 249                 fprintf(stderr, "adding device %s\n", file);
 250                 ret = btrfs_prepare_device(fd, file, zero_end,
 251                                            &dev_block_count);
 252
 253                 BUG_ON(ret);
 254
 255                 ret = btrfs_add_to_fsid(trans, root, fd, dev_block_count,
 256                                         sectorsize, sectorsize, sectorsize);
 257                 BUG_ON(ret);
 258                 close(fd);
 259                 btrfs_register_one_device(file);
 260         }
 261         btrfs_commit_transaction(trans, root);
 262         ret = close_ctree(root);
 263         BUG_ON(ret);
 264 done:
 265         return 0;
 266 }
 267