linux-ext4 - Re: Updated ext4 quota design document

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Message-ID: <20100623123014.GA13649@quack.suse.cz>
Date:	Wed, 23 Jun 2010 14:30:14 +0200
From:	Jan Kara <jack@...e.cz>
To:	tytso@....edu
Cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org
Subject: Re: Updated ext4 quota design document

On Tue 22-06-10 17:52:00, tytso@....edu wrote:
> 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....
  Ah, I forgot about that... Doing per-block checksums in that case would
be indeed more complicated. So computing checksum for each dquot is
probably simpler.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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