linux-ext4 - Re: Updated ext4 quota design document

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Message-ID: <20100622215200.GE6843@thunk.org>
Date:	Tue, 22 Jun 2010 17:52:00 -0400
From:	tytso@....edu
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Updated ext4 quota design document

On Tue, Jun 22, 2010 at 10:29:27PM +0200, Jan Kara wrote:
>   With metadata which get journaled it should be quite easy. JBD already
> must know before you go and modify buffer contents - that's why
> journal_get_write_access and friends exist. It also makes sure that your
> data cannot be modified from the moment the buffer enters commit upto the
> moment the commit is finished. So you can use buffer commit hook to compute
> and store block checksum safely.

True, but we're also interested in making sure this feature can be
used in the non-journal case as well....

     						- Ted
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