linux-kernel - Re: [PATCH 4/5] writeback: remove pages_skipped accounting in __block_write_full

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Message-Id: <20071004142641.9de1ef66.akpm@linux-foundation.org>
Date:	Thu, 4 Oct 2007 14:26:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	linux-kernel@...r.kernel.org, dgc@....com, kenchen@...gle.com,
	mrubin@...gle.com
Subject: Re: [PATCH 4/5] writeback: remove pages_skipped accounting in
 __block_write_full_page()

On Tue, 02 Oct 2007 16:41:47 +0800
Fengguang Wu <wfg@...l.ustc.edu.cn> wrote:

> This patch fixes this bug. Though I'm not sure why __block_write_full_page()
> is called only to do nothing and who actually issued the writeback for us.

kjourald wrote the page's buffers back (ext3 in ordered-data mode).  The VM
didn't know about that, so we have a PageDirty page which has clean
buffers.

We rely upon the VFS writeback code to "discover" that this dirty page has
clean buffers: the VFS will attempt to write the dirty page and will end up
marking the page clean without performing any IO.

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