I'd like to enable bio-based DM to _not_ need to clone bios. But to do so each bio-based DM target's required per-bio-data would need to be provided by upper layer biosets (as opposed to the bioset DM currently creates). So my thinking is that all system-level biosets (e.g. fs_bio_set, blkdev_dio_pool) would redirect to a device specific variant bioset IFF the underlying device advertises the need for a specific per-bio-data payload to be provided. I know this _could_ become a rathole but I'd like to avoid reverting DM back to the days of having to worry about managing mempools for the purpose of per-io allocations. I've grown spoiled by the performance and elegance that comes with having the bio and per-bio-data allocated from the same bioset. Thoughts? Mike
