linux-ext4 - Re: [RFC] [PATCH] vfs: Call filesystem callback when backing device caches should be flushed

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Message-ID: <20090121215047.GF16133@shareable.org>
Date:	Wed, 21 Jan 2009 21:50:47 +0000
From:	Jamie Lokier <jamie@...reable.org>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....EDU>
Subject: Re: [RFC] [PATCH] vfs: Call filesystem callback when backing device caches should be flushed

Jan Kara wrote:
>   Finally, I prefer maintainers of the filesystems themselves to decide
> whether their filesystem needs flushing and thus knowingly impose this
> performance penalty on them...

It could of course be a generic mount option which works with all
filesystems.

Then *administrators* can decide whether their data needs flushing,
which is where the decision should lie...

I'd vote for enabling it by default, but it's ok if it isn't.  Apps
where users expect integrity can warn if they see the option is disabled.

-- Jamie
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