void iput(struct inode *inode)
{
	if (!inode)
		return;
	BUG_ON(inode->i_state & I_CLEAR);
retry:
	if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) {
		if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) {
			atomic_inc(&inode->i_count);
			spin_unlock(&inode->i_lock);
			trace_writeback_lazytime_iput(inode);
			mark_inode_dirty_sync(inode);
			goto retry;
		}
		iput_final(inode);
	}
}
void iput(struct inode *inode)
{
	if (!inode)
		return;
	BUG_ON(inode->i_state & I_CLEAR);
retry:
	if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) {
		if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) {
			atomic_inc(&inode->i_count);
			spin_unlock(&inode->i_lock);
			trace_writeback_lazytime_iput(inode);
			mark_inode_dirty_sync(inode);
			goto retry;
		}
		iput_final(inode);
	}
}