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 #ifndef __CHECKER__
  21 #include <sys/ioctl.h>
  22 #include <sys/mount.h>
  23 #endif
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <uuid/uuid.h>
  31 #include <linux/fs.h>
  32 #include "kerncompat.h"
  33 #include "ctree.h"
  34 #include "disk-io.h"
  35 #include "transaction.h"
  36
  37 #ifdef __CHECKER__
  38 #define BLKGETSIZE64 0
  39 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
  40 #endif
  41
  42 static int __make_root_dir(struct btrfs_trans_handle *trans,
  43                            struct btrfs_root *root, u64 objectid)
  44 {
  45         int ret;
  46         char buf[8];
  47         struct btrfs_key inode_map;
  48         struct btrfs_inode_item inode_item;
  49
  50         buf[0] = '.';
  51         buf[1] = '.';
  52
  53         inode_map.objectid = objectid;
  54         btrfs_set_key_type(&inode_map, BTRFS_INODE_ITEM_KEY);
  55         inode_map.offset = 0;
  56
  57         memset(&inode_item, 0, sizeof(inode_item));
  58         btrfs_set_inode_generation(&inode_item, root->fs_info->generation);
  59         btrfs_set_inode_size(&inode_item, 6);
  60         btrfs_set_inode_nlink(&inode_item, 1);
  61         btrfs_set_inode_nblocks(&inode_item, 1);
  62         btrfs_set_inode_mode(&inode_item, S_IFDIR | 0555);
  63
  64         if (root->fs_info->tree_root == root)
  65                 btrfs_set_super_root_dir(root->fs_info->disk_super, objectid);
  66
  67         ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
  68         if (ret)
  69                 goto error;
  70         ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
  71                                     &inode_map, BTRFS_FT_DIR);
  72         if (ret)
  73                 goto error;
  74         ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
  75                                     &inode_map, BTRFS_FT_DIR);
  76         if (ret)
  77                 goto error;
  78         btrfs_set_root_dirid(&root->root_item, objectid);
  79         ret = 0;
  80 error:
  81         return ret;
  82 }
  83
  84 static int make_block_groups(struct btrfs_trans_handle *trans,
  85                              struct btrfs_root *root)
  86 {
  87         u64 group_size;
  88         u64 total_bytes;
  89         u64 cur_start;
  90         int ret;
  91         u64 nr = 0;
  92         struct btrfs_block_group_cache *cache;
  93         struct cache_tree *bg_cache = &root->fs_info->block_group_cache;
  94
  95         root = root->fs_info->extent_root;
  96
  97         /* first we bootstrap the things into cache */
  98         group_size = BTRFS_BLOCK_GROUP_SIZE;
  99         cache = malloc(sizeof(*cache));
 100         cache->key.objectid = 0;
 101         cache->key.offset = group_size;
 102         cache->cache.start = 0;
 103         cache->cache.size = group_size;
 104         btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
 105
 106         memset(&cache->item, 0, sizeof(cache->item));
 107         btrfs_set_block_group_used(&cache->item,
 108                            btrfs_super_bytes_used(root->fs_info->disk_super));
 109         ret = insert_existing_cache_extent(bg_cache, &cache->cache);
 110         BUG_ON(ret);
 111
 112         total_bytes = btrfs_super_total_bytes(root->fs_info->disk_super);
 113         cur_start = group_size;
 114         while(cur_start < total_bytes) {
 115                 cache = malloc(sizeof(*cache));
 116                 cache->key.objectid = cur_start;
 117                 cache->key.offset = group_size;
 118                 cache->cache.start = cur_start;
 119                 cache->cache.size = group_size;
 120                 btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
 121                 memset(&cache->item, 0, sizeof(cache->item));
 122                 if (nr % 3)
 123                         cache->item.flags |= BTRFS_BLOCK_GROUP_DATA;
 124
 125                 ret = insert_existing_cache_extent(bg_cache, &cache->cache);
 126                 BUG_ON(ret);
 127                 cur_start += group_size;
 128                 nr++;
 129         }
 130         /* then insert all the items */
 131         cur_start = 0;
 132         while(cur_start < total_bytes) {
 133                 struct cache_extent *ce;
 134                 ce = find_first_cache_extent(bg_cache, cur_start);
 135                 BUG_ON(!ce);
 136                 cache = container_of(ce, struct btrfs_block_group_cache,
 137                                         cache);
 138                 ret = btrfs_insert_block_group(trans, root, &cache->key,
 139                                                &cache->item);
 140                 BUG_ON(ret);
 141                 cur_start += group_size;
 142         }
 143         return 0;
 144 }
 145
 146 static int make_root_dir(int fd) {
 147         struct btrfs_root *root;
 148         struct btrfs_super_block super;
 149         struct btrfs_trans_handle *trans;
 150         int ret;
 151         struct btrfs_key location;
 152
 153         root = open_ctree_fd(fd, &super);
 154
 155         if (!root) {
 156                 fprintf(stderr, "ctree init failed\n");
 157                 return -1;
 158         }
 159         trans = btrfs_start_transaction(root, 1);
 160         ret = make_block_groups(trans, root);
 161         ret = __make_root_dir(trans, root->fs_info->tree_root,
 162                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 163         if (ret)
 164                 goto err;
 165         ret = __make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 166         if (ret)
 167                 goto err;
 168         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 169         location.offset = (u64)-1;
 170         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 171                         "default", 7,
 172                         btrfs_super_root_dir(root->fs_info->disk_super),
 173                         &location, BTRFS_FT_DIR);
 174         if (ret)
 175                 goto err;
 176         btrfs_commit_transaction(trans, root, root->fs_info->disk_super);
 177         ret = close_ctree(root, &super);
 178 err:
 179         return ret;
 180 }
 181
 182 int mkfs(int fd, char *pathname, u64 num_bytes, u32 nodesize, u32 leafsize,
 183          u32 sectorsize)
 184 {
 185         struct btrfs_super_block super;
 186         struct btrfs_leaf *empty_leaf;
 187         struct btrfs_root_item root_item;
 188         struct btrfs_item item;
 189         struct btrfs_extent_item extent_item;
 190         struct btrfs_inode_item *inode_item;
 191         char *block;
 192         int ret;
 193         u32 itemoff;
 194         u32 start_block = BTRFS_SUPER_INFO_OFFSET;
 195         u32 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize;
 196
 197         btrfs_set_super_generation(&super, 1);
 198         btrfs_set_super_bytenr(&super, start_block);
 199         btrfs_set_super_root_level(&super, 0);
 200         btrfs_set_super_root(&super, first_free);
 201         strcpy((char *)(&super.magic), BTRFS_MAGIC);
 202
 203 printf("blocksize is %d\n", leafsize);
 204         btrfs_set_super_sectorsize(&super, sectorsize);
 205         btrfs_set_super_leafsize(&super, leafsize);
 206         btrfs_set_super_nodesize(&super, nodesize);
 207
 208         num_bytes = (num_bytes / sectorsize) * sectorsize;
 209         btrfs_set_super_total_bytes(&super, num_bytes);
 210         btrfs_set_super_bytes_used(&super, start_block + 3 * leafsize +
 211                                    sectorsize);
 212         uuid_generate(super.fsid);
 213
 214         block = malloc(sectorsize);
 215         memset(block, 0, sectorsize);
 216         BUG_ON(sizeof(super) > sectorsize);
 217         memcpy(block, &super, sizeof(super));
 218         ret = pwrite(fd, block, sectorsize, BTRFS_SUPER_INFO_OFFSET);
 219         BUG_ON(ret != sectorsize);
 220
 221         /* create the tree of root objects */
 222         empty_leaf = malloc(leafsize);
 223         memset(empty_leaf, 0, leafsize);
 224         btrfs_set_header_bytenr(&empty_leaf->header, first_free);
 225         btrfs_set_header_nritems(&empty_leaf->header, 2);
 226         btrfs_set_header_generation(&empty_leaf->header, 0);
 227         btrfs_set_header_owner(&empty_leaf->header, BTRFS_ROOT_TREE_OBJECTID);
 228         memcpy(empty_leaf->header.fsid, super.fsid,
 229                sizeof(empty_leaf->header.fsid));
 230
 231         /* create the items for the root tree */
 232         inode_item = &root_item.inode;
 233         memset(inode_item, 0, sizeof(*inode_item));
 234         btrfs_set_inode_generation(inode_item, 1);
 235         btrfs_set_inode_size(inode_item, 3);
 236         btrfs_set_inode_nlink(inode_item, 1);
 237         btrfs_set_inode_nblocks(inode_item, 1);
 238         btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
 239
 240         // memset(&root_item, 0, sizeof(root_item));
 241         btrfs_set_root_dirid(&root_item, 0);
 242         btrfs_set_root_refs(&root_item, 1);
 243         btrfs_set_disk_key_offset(&item.key, 0);
 244         btrfs_set_item_size(&item, sizeof(root_item));
 245         btrfs_set_disk_key_type(&item.key, BTRFS_ROOT_ITEM_KEY);
 246
 247         itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
 248         btrfs_set_root_bytenr(&root_item, first_free + leafsize);
 249         root_item.level = 0;
 250         btrfs_set_item_offset(&item, itemoff);
 251         btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID);
 252         memcpy(empty_leaf->items, &item, sizeof(item));
 253         memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
 254                 &root_item, sizeof(root_item));
 255
 256         btrfs_set_root_bytenr(&root_item, first_free + leafsize * 2);
 257         btrfs_set_root_bytes_used(&root_item, 1);
 258         itemoff = itemoff - sizeof(root_item);
 259         btrfs_set_item_offset(&item, itemoff);
 260         btrfs_set_disk_key_objectid(&item.key, BTRFS_FS_TREE_OBJECTID);
 261         memcpy(empty_leaf->items + 1, &item, sizeof(item));
 262         memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
 263                 &root_item, sizeof(root_item));
 264         ret = pwrite(fd, empty_leaf, leafsize, first_free);
 265
 266         /* create the items for the extent tree */
 267         btrfs_set_header_bytenr(&empty_leaf->header, first_free + leafsize);
 268         btrfs_set_header_nritems(&empty_leaf->header, 4);
 269
 270         /* item1, reserve blocks 0-16 */
 271         btrfs_set_disk_key_objectid(&item.key, 0);
 272         btrfs_set_disk_key_offset(&item.key, first_free);
 273         btrfs_set_disk_key_type(&item.key, 0);
 274         btrfs_set_disk_key_type(&item.key, BTRFS_EXTENT_ITEM_KEY);
 275         itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
 276                         sizeof(struct btrfs_extent_item);
 277         btrfs_set_item_offset(&item, itemoff);
 278         btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item));
 279         btrfs_set_extent_refs(&extent_item, 1);
 280         btrfs_set_extent_owner(&extent_item, BTRFS_ROOT_TREE_OBJECTID);
 281         memcpy(empty_leaf->items, &item, sizeof(item));
 282         memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
 283                 &extent_item, btrfs_item_size(&item));
 284
 285         /* item2, give block 17 to the root */
 286         btrfs_set_disk_key_objectid(&item.key, first_free);
 287         btrfs_set_disk_key_offset(&item.key, leafsize);
 288         itemoff = itemoff - sizeof(struct btrfs_extent_item);
 289         btrfs_set_item_offset(&item, itemoff);
 290         memcpy(empty_leaf->items + 1, &item, sizeof(item));
 291         memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
 292                 &extent_item, btrfs_item_size(&item));
 293
 294         /* item3, give block 18 to the extent root */
 295         btrfs_set_disk_key_objectid(&item.key, first_free + leafsize);
 296         btrfs_set_disk_key_offset(&item.key, leafsize);
 297         itemoff = itemoff - sizeof(struct btrfs_extent_item);
 298         btrfs_set_item_offset(&item, itemoff);
 299         memcpy(empty_leaf->items + 2, &item, sizeof(item));
 300         memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
 301                 &extent_item, btrfs_item_size(&item));
 302
 303         /* item4, give block 19 to the FS root */
 304         btrfs_set_disk_key_objectid(&item.key, first_free + leafsize * 2);
 305         btrfs_set_disk_key_offset(&item.key, leafsize);
 306         itemoff = itemoff - sizeof(struct btrfs_extent_item);
 307         btrfs_set_item_offset(&item, itemoff);
 308         memcpy(empty_leaf->items + 3, &item, sizeof(item));
 309         memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
 310                 &extent_item, btrfs_item_size(&item));
 311         ret = pwrite(fd, empty_leaf, leafsize, first_free + leafsize);
 312         if (ret != leafsize)
 313                 return -1;
 314
 315         /* finally create the FS root */
 316         btrfs_set_header_bytenr(&empty_leaf->header, first_free + leafsize * 2);
 317         btrfs_set_header_nritems(&empty_leaf->header, 0);
 318         ret = pwrite(fd, empty_leaf, leafsize, first_free + leafsize * 2);
 319         if (ret != leafsize)
 320                 return -1;
 321         return 0;
 322 }
 323
 324 u64 device_size(int fd, struct stat *st)
 325 {
 326         u64 size;
 327         if (S_ISREG(st->st_mode)) {
 328                 return st->st_size;
 329         }
 330         if (!S_ISBLK(st->st_mode)) {
 331                 return 0;
 332         }
 333         if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
 334                 return size;
 335         }
 336         return 0;
 337 }
 338
 339 static void print_usage(void)
 340 {
 341         fprintf(stderr, "usage: mkfs.btrfs [ -l leafsize ] [ -n nodesize] dev [ blocks ]\n");
 342         exit(1);
 343 }
 344
 345 int main(int ac, char **av)
 346 {
 347         char *file;
 348         u64 block_count = 0;
 349         int fd;
 350         struct stat st;
 351         int ret;
 352         int i;
 353         u32 leafsize = 8 * 1024;
 354         u32 sectorsize = 4096;
 355         u32 nodesize = 8 * 1024;
 356         char *buf = malloc(sectorsize);
 357         char *realpath_name;
 358
 359         while(1) {
 360                 int c;
 361                 c = getopt(ac, av, "l:n:");
 362                 if (c < 0)
 363                         break;
 364                 switch(c) {
 365                         case 'l':
 366                                 leafsize = atol(optarg);
 367                                 break;
 368                         case 'n':
 369                                 nodesize = atol(optarg);
 370                                 break;
 371                         default:
 372                                 print_usage();
 373                 }
 374         }
 375         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 376                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 377                 exit(1);
 378         }
 379         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 380                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 381                 exit(1);
 382         }
 383         ac = ac - optind;
 384         if (ac >= 1) {
 385                 file = av[optind];
 386                 if (ac == 2) {
 387                         block_count = atol(av[optind + 1]);
 388                         if (!block_count) {
 389                                 fprintf(stderr, "error finding block count\n");
 390                                 exit(1);
 391                         }
 392                 }
 393         } else {
 394                 print_usage();
 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         ret = fstat(fd, &st);
 402         if (ret < 0) {
 403                 fprintf(stderr, "unable to stat %s\n", file);
 404                 exit(1);
 405         }
 406         if (block_count == 0) {
 407                 block_count = device_size(fd, &st);
 408                 if (block_count == 0) {
 409                         fprintf(stderr, "unable to find %s size\n", file);
 410                         exit(1);
 411                 }
 412                 block_count /= sectorsize;
 413         }
 414         if (block_count < 256) {
 415                 fprintf(stderr, "device %s is too small\n", file);
 416                 exit(1);
 417         }
 418         block_count = block_count * sectorsize;
 419         memset(buf, 0, sectorsize);
 420         for(i = 0; i < 64; i++) {
 421                 ret = write(fd, buf, sectorsize);
 422                 if (ret != sectorsize) {
 423                         fprintf(stderr, "unable to zero fill device\n");
 424                         exit(1);
 425                 }
 426         }
 427         realpath_name = realpath(file, NULL);
 428         ret = mkfs(fd, realpath_name, block_count, nodesize, leafsize,
 429                    sectorsize);
 430         if (ret) {
 431                 fprintf(stderr, "error during mkfs %d\n", ret);
 432                 exit(1);
 433         }
 434         ret = make_root_dir(fd);
 435         if (ret) {
 436                 fprintf(stderr, "failed to setup the root directory\n");
 437                 exit(1);
 438         }
 439         printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
 440                file, nodesize, leafsize, sectorsize,
 441                (unsigned long long)block_count);
 442         return 0;
 443 }
 444