Re: File System conversion -- ideas

rmoser
2003-06-29T20:28:54Z

*********** REPLY SEPARATOR ***********

On 6/29/2003 at 1:19 PM Davide Libenzi wrote:

>On Sun, 29 Jun 2003 viro@parcelfarce.linux.theplanet.co.uk wrote:
>
>> I think that I will believe it when I see the patchset implementing it.
>> Provided that it will be convincing enough. Other than that... Not
>> really. You will need code for each pair of filesystems, since
>> convertor will need to know *both* layouts. No amount of handwaving
>> is likely to work around that. And we have what, something between
>> 10 and 20 local filesystems? Have fun...
>>
>> If you want your idea to be considered seriously - take reiserfs code,
>> take ext3 code, copy both to userland and put together a conversion
>> between them. Both ways. That, by definition, is easier than doing
>> it in kernel - you have the same code available and none of the
>limitations/
>> interaction with other stuff. When you have it working, well, time to
>> see what extra PITA will come from making it coexist with other parts
>> of kernel (and with much more poor runtime environment).
>>
>> AFAICS, it is _very_ hard to implement. Even outside of the kernel.
>> If you can get it done - well, that might do a lot for having the
>> idea considered seriously. "Might" since you need to do it in a way
>> that would survive transplantation into the kernel _and_ would scale
>> better that O((number of filesystem types)^2).
>
>Maybe defining a "neutral" metadata export/import might help in limiting
>such NFS^2 ...
>
>

That was in the original message. :-p Some people don't read.

>
>- Davide
>
>-
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