Re: newbie question

[Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>]

Hi, Richard

At Thu, 27 May 2010 10:40:41 -0700,
K. Richard Pixley wrote:
> 
> Ryusuke Konishi wrote:
> > The "roll back" feature is one of our todo items, and not yet
> > supported.
> Is this something that could be accelerated by a suitable application of 
> money?

I may not understand your question, but technically speaking
it is possible to support roll back feature.
It's just a matter of work force to do as far as I think.

Still, there are some concerns about what the "roll back" sould be.

For instance, if you just want to restore from a specific snapshot you took,
you can simply read-only mount the snapshot and copy the contents you
want to restore.  That is done without any filesystem level roll back support.

Or you want to undone what you did in filesystem, you may be able to
delete log and set proper super block.  That is tricky, but possible
without filesystem level support if it's not mounted.

The hard one is live "roll back", I think, which undone the things on
mounted filesystem, or maybe at the boot time by specifying a checkpoint.

In any cases, there should be some utility programs to achieve the
functionalities above even it doesn't require any filesystem modifications.

thanks,

regards,


> --rich
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Jiro SEKIBA <jir-hfpbi5WX9J54Eiagz67IpQ@public.gmane.org>
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