dholland-t...@netbsd.org (David Holland) writes: >This was all based on the experience of adding discard and adding the >dispatching for it as a first-class [bc]devsw op rather than an ioctl: >it was a pain because it ultimately required touching _every_ driver, >not just the ones that needed to support it, but it was far less of a >mess than plumbing it as an ioctl would have been.
And it was a questionable decision as you need the discard operations to queue with other I/O operations.
