Re: reiser4 plugins

From: Nikita Danilov (nikita_at_clusterfs.com)
Date: 06/23/05

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    Date:	Thu, 23 Jun 2005 02:23:55 +0400
To: David Masover <ninja@slaphack.com>

    David Masover writes:

    [...]

    >
    > What we want is to have programs that can write small changes to one
    > file or to many files, lump all those changes into a transaction, and
    > have the transaction either succeed or fail.

    No existing file system guarantees such behavior. Even atomicity of
    single system call is not guaranteed.

    >
    > > it doesn't stop the system dead in its tracks waiting for some very long
    > > transaction to finish?
    >
    > We've also discussed this. For one thing, if we can have transactions
    > in databases which don't stop the database dead in its tracks, why can't
    > we do it with filesystems?

    Because to have such transactions databases pay huge price in both
    resource consumption and available concurrency (isolation, commit-time
    locks, etc.), and yet mechanism they use to deal with stuck transactions
    (which is simply to abort it) is not very suitable for the file system.

    >
    > But anyway, if you really want to know, ask someone else or read the
    > archives. I wasn't really paying attention except to remember that this
    > issue was resolved.

    That would be real breakthrough.

    [...]

    >
    > >> fibretions, etc,
    > >
    > >
    > > ???
    >
    > Low-level tweaking. I think the word is from some sort of calculus.

    Fibration. http://marc.theaimsgroup.com/?l=linux-kernel&m=108032604606183&w=2

    Nikita.
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