[uml-devel] filemap feature patch v2

[Steve S. <ste...@ho...>]

<jd...@ka...> wrote:
>ste...@ho... said:
> > Attached is a patch that implements this feature, with the syntax
> > described  above.
[...]
>Other than these points, this looks basically right.

I hope this looks even more right.  :) Attached is my second attempt at the 
filemap feature patch, based on 2.4.19-29um.  I broke it down into two 
parts:

Patch #1 just contains cleanups to UML that try to ensure system functions 
necessary to filemap go through the os/file.c interface.  I'm know this 
isn't your first choice, but until there is a better interface, I think 
these changes are benign and should help porting UML, and coding that 
interface, regardless of whether filemap ever makes it in.

Patch #2 contains the actual filemap feature code.  Note that hostfs does 
not go through the os/file.c interface, and thus does not go through 
filemap. This is intentional.  This is also the best example I can think of 
why there should be an io interface on top of the os/file that filemap gets 
hooked into, and hostfs bypasses directly to os/file.

Please note that this patch may cause problems and loss of data.  Use at 
your own risk - I am. :)

Steve Schmidtke

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