f2fs_add_link
err = f2fs_add_link(new_dentry, old_inode);
err = f2fs_add_link(old_dentry, whiteout);
err = f2fs_add_link(dentry, inode);
err = f2fs_add_link(dentry, inode);
err = f2fs_add_link(dentry, inode);
err = f2fs_add_link(dentry, inode);
err = f2fs_add_link(dentry, inode);