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    SubjectRe: File System conversion -- ideas


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    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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    --Bluefox Icy


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