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SubjectRe: Linux Buffer Cache Does Not Support Mirroring


Stephen,

Understood. I'll look at this. I am trying to stick with establish
interfaces. However, since all of the functions are marked "static"
it's impossible to do this with a loadable module because I cannot
import the functions I need from buffer.c, even if I am a kernel module
linked with the kernel. Petty dumb, huh?

Jeff

"Stephen C. Tweedie" wrote:
>
> Hi,
>
> On Tue, 02 Nov 1999 09:56:28 -0700, "Jeff V. Merkey"
> <jmerkey@timpanogas.com> said:
>
> > 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.
>
> I didn't say to use brw_page --- I said to look at brw_page. It sets up
> a vector of buffer_heads for the IO, and --- crucially --- initialises
> them with a callback, end_buffer_io_async.
>
> _That_ is where you get async callback for temporary buffer_heads
> submitted to the IO layer. You can replace that callback function with
> anything you want. No, brw_page won't do an arbitrary callback for you,
> but it's a perfect example from which to construct your own function
> which does exactly the IO you want, with exactly the buffer-cache
> coherency you want, and exactly the callback you want at the end of it.
>
> --Stephen

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