[dm-devel] dm-cache invalidate_cblocks range parsing

[Alasdair G Kergon]

None of which answers the point that some of the people seeing such a
range might well interpret it incorrectly and find the correct
interpretation surprising.  I am strongly of the view that interfaces
like these should be designed to minimise the risk of ambiguity or
misinterpretation by people who didn't read all the documentation and I
still think this interface should be changed.  The advantage of the "+"
approach is that it is unusual and more likely therefore to force people
to check the documentation rather than unknowingly making an incorrect
assumption about what "-" means.

Alasdair