C++ (Cpp) btrfs_write_dirty_block_groups Examples

Example #1

File: disk-io.c Project: AK47POMA/btrfs-progs

static int update_cowonly_root(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root)
{
	int ret;
	u64 old_root_bytenr;
	struct btrfs_root *tree_root = root->fs_info->tree_root;

	btrfs_write_dirty_block_groups(trans, root);
	while(1) {
		old_root_bytenr = btrfs_root_bytenr(&root->root_item);
		if (old_root_bytenr == root->node->start)
			break;
		btrfs_set_root_bytenr(&root->root_item,
				       root->node->start);
		btrfs_set_root_generation(&root->root_item,
					  trans->transid);
		root->root_item.level = btrfs_header_level(root->node);
		ret = btrfs_update_root(trans, tree_root,
					&root->root_key,
					&root->root_item);
		BUG_ON(ret);
		btrfs_write_dirty_block_groups(trans, root);
	}
	return 0;
}

Example #2

File: transaction.c Project: laudarch/simcom-linux-kernel

/*
 * this is used to update the root pointer in the tree of tree roots.
 *
 * But, in the case of the extent allocation tree, updating the root
 * pointer may allocate blocks which may change the root of the extent
 * allocation tree.
 *
 * So, this loops and repeats and makes sure the cowonly root didn't
 * change while the root pointer was being updated in the metadata.
 */
static int update_cowonly_root(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root)
{
	int ret;
	u64 old_root_bytenr;
	struct btrfs_root *tree_root = root->fs_info->tree_root;

	btrfs_write_dirty_block_groups(trans, root);

	while (1) {
		old_root_bytenr = btrfs_root_bytenr(&root->root_item);
		if (old_root_bytenr == root->node->start)
			break;

		btrfs_set_root_node(&root->root_item, root->node);
		ret = btrfs_update_root(trans, tree_root,
					&root->root_key,
					&root->root_item);
		BUG_ON(ret);

		ret = btrfs_write_dirty_block_groups(trans, root);
		BUG_ON(ret);
	}

	if (root != root->fs_info->extent_root)
		switch_commit_root(root);

	return 0;
}

Example #3

File: transaction.c Project: kdave/btrfs-progs

int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
			     struct btrfs_root *root)
{
	u64 transid = trans->transid;
	int ret = 0;
	struct btrfs_fs_info *fs_info = root->fs_info;

	if (trans->fs_info->transaction_aborted)
		return -EROFS;
	/*
	 * Flush all accumulated delayed refs so that root-tree updates are
	 * consistent
	 */
	ret = btrfs_run_delayed_refs(trans, -1);
	if (ret < 0)
		goto error;

	if (root->commit_root == root->node)
		goto commit_tree;
	if (root == root->fs_info->tree_root)
		goto commit_tree;
	if (root == root->fs_info->chunk_root)
		goto commit_tree;

	free_extent_buffer(root->commit_root);
	root->commit_root = NULL;

	btrfs_set_root_bytenr(&root->root_item, root->node->start);
	btrfs_set_root_generation(&root->root_item, trans->transid);
	root->root_item.level = btrfs_header_level(root->node);
	ret = btrfs_update_root(trans, root->fs_info->tree_root,
				&root->root_key, &root->root_item);
	if (ret < 0)
		goto error;

commit_tree:
	ret = commit_tree_roots(trans, fs_info);
	if (ret < 0)
		goto error;
	/*
	 * Ensure that all committed roots are properly accounted in the
	 * extent tree
	 */
	ret = btrfs_run_delayed_refs(trans, -1);
	if (ret < 0)
		goto error;
	btrfs_write_dirty_block_groups(trans);
	__commit_transaction(trans, root);
	if (ret < 0)
		goto error;
	ret = write_ctree_super(trans);
	btrfs_finish_extent_commit(trans);
	kfree(trans);
	free_extent_buffer(root->commit_root);
	root->commit_root = NULL;
	fs_info->running_transaction = NULL;
	fs_info->last_trans_committed = transid;
	return ret;
error:
	btrfs_destroy_delayed_refs(trans);
	free(trans);
	return ret;
}