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
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87ehtvz6bp.fsf@flamingspork.com \
--to=stewart@flamingspork.com \
--cc=david@fromorbit.com \
--cc=neutrino8@gmail.com \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.