linux-ext4 - Re: A feature??

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Message-ID: <alpine.DEB.0.99.0705200700040.12765@sigma.j-a-k-j.com>
Date:	Sun, 20 May 2007 07:01:32 -0400 (EDT)
From:	"John Anthony Kazos Jr." <jakj@...-k-j.com>
To:	Chris Lee <cslee-list@...ericom.co.uk>
cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: A feature??

> I am not a FS guru so please tell me where to get off if I sound stupid.
> After lurking for some time I have come up with something that may be of
> interest as a feature:
> 
> If EXT4 were to pr-allocate a configurable amount of space for a special file
> and then use that file as a new EXT4 partition;
> -Use that file for all new writes to disk
> -Any changed files are changed by writing the change to this file, or the
> whole changed file, whichever is more efficient end to end.
> -A section of the file includes tracking of files that need modification in
> the actual FS.
> -Then when the disk is put back into normal read write mode the FS data in the
> file just needs to be worked into the actual FS.
> 
> This way the FS could be put into suspended operation while a third party
> reads it.
> I know there are other methods like snapshots, but this works at the FS level
> so that the third party, which obviously needs to know ext4, can access the
> hard drive directly.

Sounds like a combination of loopback and union mounting, except more 
automated. Not sure there'd be much benefit to implementing those concepts 
redundantly at the filesystem level.
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