On Thu, May 25, 2017 at 11:43:17AM -0700, Bart Van Assche wrote:

Instead of explicitly calling scsi_req_init(), let
blk_get_request() call that function from inside blk_rq_init().
Add an .initialize_rq_fn() callback function to the block drivers
that need it. Merge the IDE .init_rq_fn() function into
.initialize_rq_fn() because it is too small to keep it as a
separate function.

That won't work if we don't call initialize_rq_fn from the fast path.

Except for that the idea is great and I like it.