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    SubjectRe: [PATCH 1/8] exofs: Kbuild, Headers and osd utils
    FUJITA Tomonori wrote:
    > On Mon, 16 Feb 2009 11:19:21 +0200
    > Boaz Harrosh <bharrosh@panasas.com> wrote:
    >
    >>>> Also looking
    >>>> ahead I will have RAID 0, 1, 5, and 6 on objects of different devices. bio
    >>>> is the perfect collector for memory information in this situation.
    >>> You will add such features to exofs, handling multiple devices
    >>> internally?
    >>>
    >> Multiple objects on Multiple devices, Yes.
    >
    > I thought that exofs is kinda example (reference) file system.
    >
    > Nobody has seen your code. Let's discuss when we have the
    > code. Over-designing for what we've not seen is not a good idea.
    >

    Thanks for the insults, and high credit ;)

    Yes it's "kinda example (reference) file system" of a pNFS-objects
    file system. What can I do life is tough.

    >
    >>>> exofs is not the first and only file system who is using bios. Proof of
    >>>> the matter is that block exports a bio submit routine.
    >>> Seems that exofs just passes pages and the ULD sends a SCSI command
    >>> including these pages. I don't see how exofs needs to handle bio
    >>> directly.
    >>>
    >> How do you propose to collect these pages? and keep them without allocating
    >> an extra list? without pre-allocating a struct request? and without re-inventing
    >> the bio structure?
    >
    > I don't think that allocating an extra list (or something) to keep
    > them hurts performance. We can talk about it when you have the real
    > performance results.

    So you are the one that starts to invent the wheel here. I thought I was
    the one that does that, only you only called me by names, because you never showed
    me where.

    But please only answer one question for me: Please don't write back if you do not
    answer this question:

    Why do other filesystems allow to use bios? are they going to stop? Who is going
    to remove that?

    And as I said, I am going to remove it for now, please be patient. You have never
    herd from me that I refuse to do it, did you?

    Boaz


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