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SubjectRe: kiobuf using kernel pages
Hi,

On Thu, 11 Nov 1999 08:48:16 -0800 (PST), Matt Robinson
<yakker@cthulhu.engr.sgi.com> said:

> There is a mechanism in the patch to pass AS_KERNEL to map_user_kiobuf()
> so that the kernel pages are tagged appropriately for raw I/O. Given
> that, when sd_raw_rw() is called, if the f_reada flag of the file
> pointer is DUMP_KIOBUF_NUMBER, we automatically set AS_KERNEL.

I'm munging the 2.3 kiobuf/raw IO stuff at the moment, and yes, mapping
kernel pages is on the agenda. However, I really really do not want to
see it done this way --- it _must_ be the caller who deals with the
address space stuff, not the low-level raw_rw function. The IO function
should just accept an arbitrary kiobuf for the IO, no more, no less.

I'm adding a proper set of documentation on the kiobuf IO model in the
current patches to show how it is designed to be used. Getting the
abstraction right is really important here: it not only results in
cleaner code, it will also enable the IO functions to be reused
flexibly.

--Stephen

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