Ideas for supporting shingled magnetic recording (SMR)

Right, That's exactly what most people fail to recognise with ZFS - the management interface combined filesystem and device management, but the internal implementation was still very strongly layered in the traditional namespace/block/device layers.

i.e. the linux storage stack design doesn't need to be turned inside out to provide ZFS-like management functionality, and that's a mistake we made 6-7 years ago by taking the btrfs path. Most of us thought btrfs would be stable and widespread years ago, but in hindsight, that was rather optimistic....

-Dave.