linux-ext4 - Re: [RFC] Ext4 snapshots design challenges

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Message-ID: <AANLkTikO8Mi+pfkb0U6WkCEOPd0ar4m+1auVdsf9uUhD@mail.gmail.com>
Date:	Mon, 25 Oct 2010 18:05:23 +0200
From:	"Amir G." <amir73il@...rs.sourceforge.net>
To:	Greg Freemyer <greg.freemyer@...il.com>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	next3-devel@...ts.sourceforge.net
Subject: Re: [RFC] Ext4 snapshots design challenges

On Mon, Oct 25, 2010 at 5:24 PM, Greg Freemyer <greg.freemyer@...il.com> wrote:
> Amir,
>
> I recently saw an announcement for X-Ways Forensics
> (http://www.x-ways.net/) that they now support next3 as a filesystem
> to analyze.  See Oct. 10 msg under topic "Announcements: X-Ways
> Forensics 15.8" at http://www.winhex.net/  (I think that is a public
> posting board.)
>
> I was surprised to see that, but assuming it was indeed your project
> they added support for, I congratulate you on the above.
>

Thanks! I guess :-)
I am pretty clueless with regards to the big players in the storage market.
I do not know X-Ways, but it looks like they are a big player.

> I'm curious what level of support they offer.  In particular, they
> only offer limited support for NTFS shadow copies, so I'm curious if
> the next3 support is similarly limited.
>
> Or since next3 is GPL they may have been able to do a more
> comprehensive job with it than with ntfs shadow copies.
>
> Any info you have would be appreciated.
> Greg
>

As you can figure out, I was not involved or notified about this move.
Judging from their release notes, I would say that the added support is
mostly adding some information tags and verifying the correctness of the
exclude bitmap:

* Support for the Linux file system next3. The exclude bitmap inode
will be evaluated,
  and snapshot files are marked with (SF) in the Attribute column.
  Specialist license or higher required.

You shouldn't be too surprised to learn that the only file system
integrity test that
I have added in my e2fsprogs patches is verifying the correctness of
the exclude bitmap ;-)

Thanks for the info and sorry if your post was rejected from next3-devel.
I fixed the permissions for out of list posts.

Amir.
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