[dm-devel] [PATCH v7 0/6] block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES

[Christoph Hellwig]

On Thu, Mar 26, 2020 at 10:34:42AM -0400, Martin K. Petersen wrote:
> I just worry about the proliferation of identical merging and splitting
> code throughout the block stack as we add additional single-range, no
> payload operations (Verify, etc.). I prefer to enforce the semantics in
> the LLD and not in the plumbing. But I won't object to a separate
> REQ_OP_ALLOCATE if you find the resulting code duplication acceptable.

I find it acceptable for now.  And I think we should find some way
(e.g. by being table driven) to share code between differnet opcodes.