linux-kernel - Re: [PATCH 2/4] mm: Only enforce stable page writes if the backing device requires it

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Message-ID: <20121121105732.GB19050@infradead.org>
Date:	Wed, 21 Nov 2012 05:57:32 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	axboe@...nel.dk, lucho@...kov.net, jack@...e.cz, ericvh@...il.com,
	tytso@....edu, rminnich@...dia.gov, viro@...iv.linux.org.uk,
	martin.petersen@...cle.com, neilb@...e.de, david@...morbit.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	adilger.kernel@...ger.ca, bharrosh@...asas.com, jlayton@...ba.org,
	v9fs-developer@...ts.sourceforge.net, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/4] mm: Only enforce stable page writes if the backing
 device requires it

On Tue, Nov 20, 2012 at 06:00:41PM -0800, Darrick J. Wong wrote:
> Create a helper function to check if a backing device requires stable page
> writes and, if so, performs the necessary wait.  Then, make it so that all
> points in the memory manager that handle making pages writable use the helper
> function.  This should provide stable page write support to most filesystems,
> while eliminating unnecessary waiting for devices that don't require the
> feature.

> +void wait_if_stable_page_write(struct page *page)

wait_for_stable_page() ?

Also this really needs a kerneldoc comment describing the usage.

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