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Re: universal filesystem convertor

From: Serguei Tzukanov
Subject: Re: universal filesystem convertor
Date: Wed, 09 Jan 2002 23:45:13 +0300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.3) Gecko/20010802

Andrew Clausen wrote:

Yep, nice idea :)  It will run into problems in low free space.
(free space must be > largest file, right).

This can be solved by special copy, i.e. we get few last pages of the file from primary fs, truncate the file and write these pages at the end of destination file (if secondary fs does not support sparse files, we can write in reversed order :-).

Also, your convertfs can also be used as a resizer, right?
Yes, you are right.
We can even collect many loop devices into one LVM device, repartition it another way than the real disk and create a totally different physical layout.

I guess it's all rather slow, but nice none-the-less :)
You might also be interested in Partition Surprise (google it!)
It's slow mostly because of journaling.
Hmm... Partition Surprise will need special handling of reiserfs because of its tail compression.

Ralf B├Ąchle told me he thought there might be problems with using
loopback like this... I guess it's working ok?

Loopback works fine for me on 2.4.17.

Another thing is that implemented algorithm is somewhat buggy.
This is still proof-of-concept version.

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