-
-#if 0
-int mkfs(int fd)
-{
- struct btrfs_root_info info[2];
- struct btrfs_leaf empty_leaf;
- struct btrfs_item item;
- struct btrfs_extent_item extent_item;
- int ret;
-
- /* setup the super block area */
- memset(info, 0, sizeof(info));
- btrfs_set_root_blocknr(info, 16);
- btrfs_set_root_objectid(info, 1);
- btrfs_set_root_tree_root(info, 17);
-
- btrfs_set_root_blocknr(info + 1, 16);
- btrfs_set_root_objectid(info + 1, 2);
- btrfs_set_root_tree_root(info + 1, 18);
-
- ret = pwrite(fd, info, sizeof(info),
- BTRFS_SUPER_INFO_OFFSET(BTRFS_BLOCKSIZE));
- if (ret != sizeof(info))
- return -1;
-
- /* create leaves for the tree root and extent root */
- memset(&empty_leaf, 0, sizeof(empty_leaf));
- btrfs_set_header_parentid(&empty_leaf.header, 1);
- btrfs_set_header_blocknr(&empty_leaf.header, 17);
- ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 17 * BTRFS_BLOCKSIZE);
- if (ret != sizeof(empty_leaf))
- return -1;
-
- btrfs_set_header_parentid(&empty_leaf.header, 2);
- btrfs_set_header_blocknr(&empty_leaf.header, 18);
- btrfs_set_header_nritems(&empty_leaf.header, 3);
-
- /* item1, reserve blocks 0-16 */
- btrfs_set_key_objectid(&item.key, 0);
- btrfs_set_key_offset(&item.key, 17);
- btrfs_set_key_flags(&item.key, 0);
- btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
- sizeof(struct btrfs_extent_item));
- btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item));
- btrfs_set_extent_refs(&extent_item, 1);
- btrfs_set_extent_owner(&extent_item, 0);
- memcpy(empty_leaf.items, &item, sizeof(item));
- memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
- btrfs_item_size(&item));
-
- /* item2, give block 17 to the root */
- btrfs_set_key_objectid(&item.key, 17);
- btrfs_set_key_offset(&item.key, 1);
- btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
- sizeof(struct btrfs_extent_item) * 2);
- btrfs_set_extent_owner(&extent_item, 1);
- memcpy(empty_leaf.items + 1, &item, sizeof(item));
- memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
- btrfs_item_size(&item));
-
- /* item3, give block 18 for the extent root */
- btrfs_set_key_objectid(&item.key, 18);
- btrfs_set_key_offset(&item.key, 1);
- btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
- sizeof(struct btrfs_extent_item) * 3);
- btrfs_set_extent_owner(&extent_item, 2);
- memcpy(empty_leaf.items + 2, &item, sizeof(item));
- memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
- btrfs_item_size(&item));
- ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * BTRFS_BLOCKSIZE);
- if (ret != sizeof(empty_leaf))
- return -1;
- return 0;
-}
-#endif