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    SubjectRe: reiser4 plugins
    Hans Reiser wrote:
    > Hubert Chan wrote:
    >
    >
    >>On Fri, 01 Jul 2005 03:06:19 -0500, David Masover <ninja@slaphack.com> said:
    >>
    >>
    >>
    >>
    >>>Hubert Chan wrote:
    >>>
    >>>
    >>
    >>
    >>
    >>
    >>>>The main thing blocking file-as-dir is that there are some
    >>>>locking(IIRC?) issues. And, of course, some people wouldn't want it
    >>>>to be merged into the mainline kernel. (Of course, the latter
    >>>>doesn't prevent Namesys from maintaining their own patches for people
    >>>>to play around with.)
    >>>>
    >>>>
    >>
    >>
    >>
    >>
    >>>What's the locking issue? I think that was more about transactions...
    >>>
    >>>
    >>
    >>It was whatever was Al Viro's (technical) complaint about file-as-dir.
    >>I don't remember exactly what it was. The technical people know what it
    >>is (and the Namesys guys are probably working on it), and the exact
    >>issue doesn't concern us non-technical people that much, so I don't feel
    >>like looking it up. But if you want to, just look for Al Viro's message
    >>in this thread.
    >>
    >>
    >>
    >
    > Cycle detection when hard links to directories are allowed. There is a
    > debate over whether cycle detection is feasible that can only be
    > resolved by working code or a formal proof that it is not
    > computationally feasible.

    Ah. But then, one solution was to avoid the issue at all, and have the
    directory inside a file act as a mountpoint. After all, mount --bind
    doesn't cause problems...

    Hey! This sounds like metafs (/meta) already! I wonder if we can do
    file-as-dir in /meta, and just not support user-created hardlinks there?
    (other than creating brand-new files, of course...)
    -
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