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    SubjectRe: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains
    On Thu, Feb 01, 2001 at 08:14:58PM +0530, bsuparna@in.ibm.com wrote:
    >
    > >Hi,
    > >
    > >On Thu, Feb 01, 2001 at 10:25:22AM +0530, bsuparna@in.ibm.com wrote:
    > >>
    > >> >We _do_ need the ability to stack completion events, but as far as the
    > >> >kiobuf work goes, my current thoughts are to do that by stacking
    > >> >lightweight "clone" kiobufs.
    > >>
    > >> Would that work with stackable filesystems ?
    > >
    > >Only if the filesystems were using VFS interfaces which used kiobufs.
    > >Right now, the only filesystem using kiobufs is XFS, and it only
    > >passes them down to the block device layer, not to other filesystems.
    >
    > That would require the vfs interfaces themselves (address space
    > readpage/writepage ops) to take kiobufs as arguments, instead of struct
    > page * . That's not the case right now, is it ?

    No, and with the current kiobufs it would not make sense, because they
    are to heavy-weight. With page,length,offsett iobufs this makes sense
    and is IMHO the way to go.

    Christoph

    --
    Of course it doesn't work. We've performed a software upgrade.
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