int ocfs2_change_file_space(struct file *file, unsigned int cmd,
			    struct ocfs2_space_resv *sr)
{
	struct inode *inode = file_inode(file);
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	int ret;

	if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
	    !ocfs2_writes_unwritten_extents(osb))
		return -ENOTTY;
	else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
		 !ocfs2_sparse_alloc(osb))
		return -ENOTTY;

	if (!S_ISREG(inode->i_mode))
		return -EINVAL;

	if (!(file->f_mode & FMODE_WRITE))
		return -EBADF;

	ret = mnt_want_write_file(file);
	if (ret)
		return ret;
	ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
	mnt_drop_write_file(file);
	return ret;
}

Unknown