From: Stewart Smith <stewart@flamingspork.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Grozdan <neutrino8@gmail.com>, xfs@oss.sgi.com
Subject: Re: Transactional XFS?
Date: Thu, 16 Feb 2012 16:38:02 +1100 [thread overview]
Message-ID: <87ehtvz6bp.fsf@flamingspork.com> (raw)
In-Reply-To: <20120216014338.GX14132@dastard>
On Thu, 16 Feb 2012 12:43:38 +1100, Dave Chinner <david@fromorbit.com> wrote:
> Oh, so making some set of random user changes to random user data
> have ACID properties? That's what databases are for, isn't it? :P
Yep :)
> I dont see us implementing anything like this in XFS anytime soon.
> We are looking to add transaction grouping so that we can make
> things that currently require multiple transactions (e.g. create a
> file, add a default ACL) atomic, but I don't have any plans to
> open the can of worms that is userspace controlled transactions any
> time soon.
The worst part is working out the semantics as to not break existing apps
(without completely sacrificing concurrency).
> We already have this upgrade rollback functionality in development
> with none of that complexity - it uses filesystem snapshots so is
> effectively filesystem independent and already works with yum and
> btrfs. You don't need any special application support for this -
> rollback from a failed upgrade is as simple as a reboot.
The downside being you also roll back your logs and any other changes
made during that time. On the whole though, it's probably sufficient.
> Sure, Microsoft have been trying to make their filesystem a database
> for years. It's theoretically possible, but in practice they've
> fallen short in every attempt in the past 15 years.
err... try 20 years :)
It's funny in a way, sqlite succeeds at effectively doing this for an
awful large number of applications.
--
Stewart Smith
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next prev parent reply other threads:[~2012-02-16 5:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-15 19:15 Transactional XFS? Grozdan
2012-02-16 0:22 ` Dave Chinner
2012-02-16 1:01 ` Stewart Smith
2012-02-16 1:43 ` Dave Chinner
2012-02-16 5:38 ` Stewart Smith [this message]
2012-02-16 6:42 ` Dave Chinner
2012-02-17 4:40 ` Stewart Smith
2012-02-16 22:10 ` Peter Grandi
2012-02-16 12:01 ` Matthias Schniedermeyer
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