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inode 节点clear是把节点设置处于一种状态，即 I_FREEING | I_CLEAR

 * I_FREEING		Set when inode is about to be freed but still has dirty *			pages or buffers attached or the inode itself is still *			dirty. * I_CLEAR		Added by clear_inode().  In this state the inode is *			clean and can be destroyed.  Inode keeps I_FREEING.

void clear_inode(struct inode *inode){	might_sleep();	/*	 * We have to cycle tree_lock here because reclaim can be still in the	 * process of removing the last page (in __delete_from_page_cache())	 * and we must not free mapping under it.	 */	spin_lock_irq(&inode->i_data.tree_lock);	BUG_ON(inode->i_data.nrpages);	BUG_ON(inode->i_data.nrexceptional);	spin_unlock_irq(&inode->i_data.tree_lock);	BUG_ON(!list_empty(&inode->i_data.private_list));	BUG_ON(!(inode->i_state & I_FREEING));	BUG_ON(inode->i_state & I_CLEAR);	BUG_ON(!list_empty(&inode->i_wb_list));	/* don't need i_lock here, no concurrent mods to i_state */	inode->i_state = I_FREEING | I_CLEAR;}EXPORT_SYMBOL(clear_inode);

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