- /* create the items for the root tree */
- memset(&root_item, 0, sizeof(root_item));
- inode_item = &root_item.inode;
- btrfs_set_stack_inode_generation(inode_item, 1);
- btrfs_set_stack_inode_size(inode_item, 3);
- btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
- btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, cfg->nodesize);
- btrfs_set_root_generation(&root_item, 1);
-
- memset(&disk_key, 0, sizeof(disk_key));
- btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- nritems = 0;
-
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
- nritems), sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
-
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);