[6] = BTRFS_CSUM_TREE_OBJECTID,
};
+static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
+ struct extent_buffer *buf)
+{
+ struct btrfs_root_item root_item;
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_disk_key disk_key;
+ u32 nritems = 0;
+ u32 itemoff;
+ int ret = 0;
+ int blk;
+
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ memset(&root_item, 0, sizeof(root_item));
+ memset(&disk_key, 0, sizeof(disk_key));
+
+ /* create the items for the root tree */
+ 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);
+
+ btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
+
+ for (blk = 0; blk < MKFS_BLOCK_COUNT; blk++) {
+ if (blk == MKFS_SUPER_BLOCK || blk == MKFS_ROOT_TREE
+ || blk == MKFS_CHUNK_TREE)
+ continue;
+
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[blk]);
+ btrfs_set_disk_key_objectid(&disk_key,
+ reference_root_table[blk]);
+ 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 -= sizeof(root_item);
+ }
+
+ /* generate checksum */
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+
+ /* write back root tree */
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_ROOT_TREE]);
+ if (ret != cfg->nodesize)
+ return (ret < 0 ? -errno : -EIO);
+
+ return ret;
+}
+
/*
* @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
*
{
struct btrfs_super_block super;
struct extent_buffer *buf;
- struct btrfs_root_item root_item;
struct btrfs_disk_key disk_key;
struct btrfs_extent_item *extent_item;
- struct btrfs_inode_item *inode_item;
struct btrfs_chunk *chunk;
struct btrfs_dev_item *dev_item;
struct btrfs_dev_extent *dev_extent;
btrfs_header_chunk_tree_uuid(buf),
BTRFS_UUID_SIZE);
- /* 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[MKFS_EXTENT_TREE]);
- 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[MKFS_DEV_TREE]);
- 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[MKFS_FS_TREE]);
- 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[MKFS_CSUM_TREE]);
- 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[MKFS_ROOT_TREE]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
+ ret = btrfs_create_tree_root(fd, cfg, buf);
+ if (ret < 0)
goto out;
- }
/* create the items for the extent tree */
memset(buf->data + sizeof(struct btrfs_header), 0,