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    SubjectRe: Linux Buffer Cache Does Not Support Mirroring

    I looked at the brw_page code. While everyone calls this an "async"
    interface, in fact, it uses the same semantic as a sync interface and
    does not allow support for callbacks.

    Jeff

    kernel@kvack.org wrote:
    >
    > On Mon, 1 Nov 1999, Jeff V. Merkey wrote:
    >
    > > What everyone is side-stepping is that the interface between the drivers
    > > and the buffer cache is incestuous
    >
    > What do you mean by incestuous -- if you mean that they depend on it,
    > you're thinking of things in the wrong way. Think of the buffer_head as a
    > block io tag. The block drivers themselves don't interact with the buffer
    > cache, they interact with requests.
    >
    > > -- this prevents folks from building
    > > async I/O based FS's on Linux. The solution is not a simple one -- the
    > > drivers and buffer cache interface needs to be changed to elimnate these
    > > dependencies so.
    >
    > So you're incapable of making use of b_end_io to complete an async io
    > request? Wow.
    >
    > -ben
    >
    > -
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