[RFC PATCH 0/8] current relay cleanup patchset

[Tom Zanussi]

Here's the current relay cleanup patchset.  The first two patches make
the write path completely replaceable, the third adds flags along with
some related cleanup, and the next 5 remove the padding in several
stages. 

It's a work in progress, but because I wanted the intermediate stages to
actually work and not break anything, some of these patches, especially
05, are just temporary and will be removed in the next iteration.

I didn't have time to clean up the first 3 either - I'll also do that
the next time around.

Anyway, removing the padding has simplified the read/splice code
significantly; it's always been a source of headaches so I'm glad it's
gone, and it doesn't seem to have broken anything - a quick test using
blktrace in both read() and splice() modes didn't show any problems.

In the next round I plan to do vmap and sub-buffer removal.

Tom




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