Re: [Xen-devel] [RFC PATCH] blkif.h: document scsi/0x12/0x83 node

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Konrad Rzeszutek Wilk writes ("Re: [Xen-devel] [RFC PATCH] blkif.h: document 
scsi/0x12/0x83 node"):
> > I don't think this is a sterile academic conversation which would (if
> > satisfactorily answered) have no real implications.  Rather, if we
> > understood the use case properly, there would probably be implications
> > for whether how this functionality ought to be exposed via the libxl
> > API; whether blkfront should consume this information by default; and
> > so on.
> 
> Lets take one step back.
> 
> What is the problem with documenting an existing use-case in blkif.h?
> 
> Regardless of whether it is viewed "legacy" by some folks and by others
> drivers it is still in use?

Firstly, if you want to document it then the documentation needs to
explain what the semantics are supposed to be.  At the moment I'm not
sure I see a correct and useful set of semantics.  I had a go at
writing something but several of the things I wrote in it seem to have
been contradicted by comments from Bob Liu and others.

It is difficult to write a suitable document.  Ideally the document
would give an example use case.  But it appears that the only use case
is super secret!

Secondly, apparently this is not regarded as deprecated.  Bob Liu
says he plans to add support for it to blkfront.

Ian.

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