2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #define _XOPEN_SOURCE 500
21 #include <sys/ioctl.h>
22 #include <sys/mount.h>
26 #include <sys/types.h>
30 #include <uuid/uuid.h>
33 #include "kerncompat.h"
36 #include "transaction.h"
39 #define BLKGETSIZE64 0
40 static inline int ioctl(int fd, int define, u64 *size) { return 0; }
43 static u64 parse_size(char *s)
49 if (!isdigit(s[len - 1])) {
50 c = tolower(s[len - 1]);
61 fprintf(stderr, "Unknown size descriptor %c\n", c);
66 return atol(s) * mult;
69 static int __make_root_dir(struct btrfs_trans_handle *trans,
70 struct btrfs_root *root, u64 objectid)
74 struct btrfs_key inode_map;
75 struct btrfs_inode_item inode_item;
80 inode_map.objectid = objectid;
81 btrfs_set_key_type(&inode_map, BTRFS_INODE_ITEM_KEY);
84 memset(&inode_item, 0, sizeof(inode_item));
85 btrfs_set_inode_generation(&inode_item, root->fs_info->generation);
86 btrfs_set_inode_size(&inode_item, 0);
87 btrfs_set_inode_nlink(&inode_item, 1);
88 btrfs_set_inode_nblocks(&inode_item, 0);
89 btrfs_set_inode_mode(&inode_item, S_IFDIR | 0555);
91 if (root->fs_info->tree_root == root)
92 btrfs_set_super_root_dir(root->fs_info->disk_super, objectid);
94 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
98 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid);
101 btrfs_set_root_dirid(&root->root_item, objectid);
107 static int make_block_groups(struct btrfs_trans_handle *trans,
108 struct btrfs_root *root)
115 struct btrfs_block_group_cache *cache;
116 struct cache_tree *bg_cache = &root->fs_info->block_group_cache;
118 root = root->fs_info->extent_root;
120 /* first we bootstrap the things into cache */
121 group_size = BTRFS_BLOCK_GROUP_SIZE;
122 cache = malloc(sizeof(*cache));
123 cache->key.objectid = 0;
124 cache->key.offset = group_size;
125 cache->cache.start = 0;
126 cache->cache.size = group_size;
127 btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
129 memset(&cache->item, 0, sizeof(cache->item));
130 btrfs_set_block_group_used(&cache->item,
131 btrfs_super_bytes_used(root->fs_info->disk_super));
132 ret = insert_existing_cache_extent(bg_cache, &cache->cache);
135 total_bytes = btrfs_super_total_bytes(root->fs_info->disk_super);
136 cur_start = group_size;
137 while(cur_start < total_bytes) {
138 cache = malloc(sizeof(*cache));
139 cache->key.objectid = cur_start;
140 cache->key.offset = group_size;
141 cache->cache.start = cur_start;
142 cache->cache.size = group_size;
143 btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
144 memset(&cache->item, 0, sizeof(cache->item));
146 cache->item.flags |= BTRFS_BLOCK_GROUP_DATA;
148 ret = insert_existing_cache_extent(bg_cache, &cache->cache);
150 cur_start += group_size;
153 /* then insert all the items */
155 while(cur_start < total_bytes) {
156 struct cache_extent *ce;
157 ce = find_first_cache_extent(bg_cache, cur_start);
159 cache = container_of(ce, struct btrfs_block_group_cache,
161 ret = btrfs_insert_block_group(trans, root, &cache->key,
164 cur_start += group_size;
169 static int make_root_dir(int fd) {
170 struct btrfs_root *root;
171 struct btrfs_super_block super;
172 struct btrfs_trans_handle *trans;
174 struct btrfs_key location;
176 root = open_ctree_fd(fd, &super);
179 fprintf(stderr, "ctree init failed\n");
182 trans = btrfs_start_transaction(root, 1);
183 ret = make_block_groups(trans, root);
184 ret = __make_root_dir(trans, root->fs_info->tree_root,
185 BTRFS_ROOT_TREE_DIR_OBJECTID);
188 ret = __make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
191 memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
192 location.offset = (u64)-1;
193 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
195 btrfs_super_root_dir(root->fs_info->disk_super),
196 &location, BTRFS_FT_DIR);
200 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
201 "default", 7, location.objectid,
202 BTRFS_ROOT_TREE_DIR_OBJECTID);
206 btrfs_commit_transaction(trans, root, root->fs_info->disk_super);
207 ret = close_ctree(root, &super);
212 int mkfs(int fd, char *pathname, u64 num_bytes, u32 nodesize, u32 leafsize,
213 u32 sectorsize, u32 stripesize)
215 struct btrfs_super_block super;
216 struct btrfs_leaf *empty_leaf;
217 struct btrfs_root_item root_item;
218 struct btrfs_item item;
219 struct btrfs_extent_item extent_item;
220 struct btrfs_inode_item *inode_item;
224 u32 start_block = BTRFS_SUPER_INFO_OFFSET;
225 u32 first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize;
227 btrfs_set_super_generation(&super, 1);
228 btrfs_set_super_bytenr(&super, start_block);
229 btrfs_set_super_root_level(&super, 0);
230 btrfs_set_super_root(&super, first_free);
231 strcpy((char *)(&super.magic), BTRFS_MAGIC);
233 printf("blocksize is %d\n", leafsize);
234 btrfs_set_super_sectorsize(&super, sectorsize);
235 btrfs_set_super_leafsize(&super, leafsize);
236 btrfs_set_super_nodesize(&super, nodesize);
237 btrfs_set_super_stripesize(&super, stripesize);
239 num_bytes = (num_bytes / sectorsize) * sectorsize;
240 btrfs_set_super_total_bytes(&super, num_bytes);
241 btrfs_set_super_bytes_used(&super, start_block + 3 * leafsize +
243 uuid_generate(super.fsid);
245 block = malloc(sectorsize);
246 memset(block, 0, sectorsize);
247 BUG_ON(sizeof(super) > sectorsize);
248 memcpy(block, &super, sizeof(super));
249 ret = pwrite(fd, block, sectorsize, BTRFS_SUPER_INFO_OFFSET);
250 BUG_ON(ret != sectorsize);
252 /* create the tree of root objects */
253 empty_leaf = malloc(leafsize);
254 memset(empty_leaf, 0, leafsize);
255 btrfs_set_header_bytenr(&empty_leaf->header, first_free);
256 btrfs_set_header_nritems(&empty_leaf->header, 2);
257 btrfs_set_header_generation(&empty_leaf->header, 1);
258 btrfs_set_header_owner(&empty_leaf->header, BTRFS_ROOT_TREE_OBJECTID);
259 memcpy(empty_leaf->header.fsid, super.fsid,
260 sizeof(empty_leaf->header.fsid));
262 /* create the items for the root tree */
263 inode_item = &root_item.inode;
264 memset(inode_item, 0, sizeof(*inode_item));
265 btrfs_set_inode_generation(inode_item, 1);
266 btrfs_set_inode_size(inode_item, 3);
267 btrfs_set_inode_nlink(inode_item, 1);
268 btrfs_set_inode_nblocks(inode_item, 1);
269 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
271 // memset(&root_item, 0, sizeof(root_item));
272 btrfs_set_root_dirid(&root_item, 0);
273 btrfs_set_root_refs(&root_item, 1);
274 btrfs_set_disk_key_offset(&item.key, 0);
275 btrfs_set_item_size(&item, sizeof(root_item));
276 btrfs_set_disk_key_type(&item.key, BTRFS_ROOT_ITEM_KEY);
278 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
279 btrfs_set_root_bytenr(&root_item, first_free + leafsize);
281 btrfs_set_item_offset(&item, itemoff);
282 btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID);
283 memcpy(empty_leaf->items, &item, sizeof(item));
284 memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
285 &root_item, sizeof(root_item));
287 btrfs_set_root_bytenr(&root_item, first_free + leafsize * 2);
288 btrfs_set_root_bytes_used(&root_item, 1);
289 itemoff = itemoff - sizeof(root_item);
290 btrfs_set_item_offset(&item, itemoff);
291 btrfs_set_disk_key_objectid(&item.key, BTRFS_FS_TREE_OBJECTID);
292 memcpy(empty_leaf->items + 1, &item, sizeof(item));
293 memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
294 &root_item, sizeof(root_item));
295 ret = pwrite(fd, empty_leaf, leafsize, first_free);
297 /* create the items for the extent tree */
298 btrfs_set_header_bytenr(&empty_leaf->header, first_free + leafsize);
299 btrfs_set_header_nritems(&empty_leaf->header, 4);
301 /* item1, reserve blocks 0-16 */
302 btrfs_set_disk_key_objectid(&item.key, 0);
303 btrfs_set_disk_key_offset(&item.key, first_free);
304 btrfs_set_disk_key_type(&item.key, 0);
305 btrfs_set_disk_key_type(&item.key, BTRFS_EXTENT_ITEM_KEY);
306 itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
307 sizeof(struct btrfs_extent_item);
308 btrfs_set_item_offset(&item, itemoff);
309 btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item));
310 btrfs_set_extent_refs(&extent_item, 1);
311 memcpy(empty_leaf->items, &item, sizeof(item));
312 memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
313 &extent_item, btrfs_item_size(&item));
315 /* item2, give block 17 to the root */
316 btrfs_set_disk_key_objectid(&item.key, first_free);
317 btrfs_set_disk_key_offset(&item.key, leafsize);
318 itemoff = itemoff - sizeof(struct btrfs_extent_item);
319 btrfs_set_item_offset(&item, itemoff);
320 memcpy(empty_leaf->items + 1, &item, sizeof(item));
321 memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
322 &extent_item, btrfs_item_size(&item));
324 /* item3, give block 18 to the extent root */
325 btrfs_set_disk_key_objectid(&item.key, first_free + leafsize);
326 btrfs_set_disk_key_offset(&item.key, leafsize);
327 itemoff = itemoff - sizeof(struct btrfs_extent_item);
328 btrfs_set_item_offset(&item, itemoff);
329 memcpy(empty_leaf->items + 2, &item, sizeof(item));
330 memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
331 &extent_item, btrfs_item_size(&item));
333 /* item4, give block 19 to the FS root */
334 btrfs_set_disk_key_objectid(&item.key, first_free + leafsize * 2);
335 btrfs_set_disk_key_offset(&item.key, leafsize);
336 itemoff = itemoff - sizeof(struct btrfs_extent_item);
337 btrfs_set_item_offset(&item, itemoff);
338 memcpy(empty_leaf->items + 3, &item, sizeof(item));
339 memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
340 &extent_item, btrfs_item_size(&item));
341 ret = pwrite(fd, empty_leaf, leafsize, first_free + leafsize);
345 /* finally create the FS root */
346 btrfs_set_header_bytenr(&empty_leaf->header, first_free + leafsize * 2);
347 btrfs_set_header_nritems(&empty_leaf->header, 0);
348 ret = pwrite(fd, empty_leaf, leafsize, first_free + leafsize * 2);
354 u64 device_size(int fd, struct stat *st)
357 if (S_ISREG(st->st_mode)) {
360 if (!S_ISBLK(st->st_mode)) {
363 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
369 static void print_usage(void)
371 fprintf(stderr, "usage: mkfs.btrfs [ -l leafsize ] [ -n nodesize] dev [ blocks ]\n");
375 int main(int ac, char **av)
383 u32 leafsize = 16 * 1024;
384 u32 sectorsize = 4096;
385 u32 nodesize = 16 * 1024;
386 u32 stripesize = 4096;
387 char *buf = malloc(sectorsize);
392 c = getopt(ac, av, "l:n:s:");
397 leafsize = parse_size(optarg);
400 nodesize = parse_size(optarg);
403 stripesize = parse_size(optarg);
409 if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
410 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
413 if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
414 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
421 block_count = parse_size(av[optind + 1]);
423 fprintf(stderr, "error finding block count\n");
430 fd = open(file, O_RDWR);
432 fprintf(stderr, "unable to open %s\n", file);
435 ret = fstat(fd, &st);
437 fprintf(stderr, "unable to stat %s\n", file);
440 if (block_count == 0) {
441 block_count = device_size(fd, &st);
442 if (block_count == 0) {
443 fprintf(stderr, "unable to find %s size\n", file);
447 block_count /= sectorsize;
448 block_count *= sectorsize;
450 if (block_count < 256 * 1024 * 1024) {
451 fprintf(stderr, "device %s is too small\n", file);
454 memset(buf, 0, sectorsize);
455 for(i = 0; i < 64; i++) {
456 ret = write(fd, buf, sectorsize);
457 if (ret != sectorsize) {
458 fprintf(stderr, "unable to zero fill device\n");
462 realpath_name = realpath(file, NULL);
463 ret = mkfs(fd, realpath_name, block_count, nodesize, leafsize,
464 sectorsize, stripesize);
466 fprintf(stderr, "error during mkfs %d\n", ret);
469 ret = make_root_dir(fd);
471 fprintf(stderr, "failed to setup the root directory\n");
474 printf("fs created on %s nodesize %u leafsize %u sectorsize %u bytes %llu\n",
475 file, nodesize, leafsize, sectorsize,
476 (unsigned long long)block_count);