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    SubjectRe: [PATCH 2.6.21] cramfs: add cramfs Linear XIP
    On Thu, Jun 07, 2007 at 02:11:44PM -0700, Jared Hulbert wrote:
    > >that even more important doesn't require pulling in
    > >the whole block layer which is especially important for embedded
    > >devices at the lower end of the scala.
    >
    > Good point. That is a big oversight. Though I would prefer to handle
    > that in the same fs rather than fork.

    If if were actually talking about complex filesystem I'd agree. But
    the cramfs xip patch posted here touches about 2/3 of the number of
    lines that cramfs has in total. And cramfs is not exactly the best
    base to start with..

    > >I still think it'd be even better to just
    > >hook xip support into jffs or logfs because they give you a full
    > >featured flash filesystem for all needs without the complexity
    > >of strictly partitioning between xip-capable and write parts
    > >of your storage.
    >
    > This is nirvana. But it is not the goal of the patches in question.
    > In fact there are several use cases that don't need and don't value
    > the writeability and don't need therefore the overhead. It is a long
    > term goal never the less.

    With the filemap_xip.c helpers adding xip support to any filesystem
    is pretty trivial for the highlevel filesystem operations. The only
    interesting bit is the lowlevel code (the get_xip_page method and
    the others Carsten mentioned), but we need to do these lowlevel
    code in a generic and proper way anyway.

    I'll try to hack up an xip prototype for jffs2 next week.
    -
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