linux-kernel - Re: [PATCH 07/15] writeback: split inode_wb_list_lock into bdi_writeback.list

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Message-Id: <20110607160319.57f27481.akpm@linux-foundation.org>
Date:	Tue, 7 Jun 2011 16:03:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	<linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/15] writeback: split inode_wb_list_lock into
 bdi_writeback.list_lock

On Wed, 08 Jun 2011 05:32:43 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

>  static void bdev_inode_switch_bdi(struct inode *inode,
>  			struct backing_dev_info *dst)
>  {
> -	spin_lock(&inode_wb_list_lock);
> +	struct backing_dev_info *old = inode->i_data.backing_dev_info;
> +
> +	if (unlikely(dst == old))		/* deadlock avoidance */
> +		return;

Why does this occur?
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