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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