Rootless CSI drivers?

[saolof]

I'm wondering about what options exist for CSI drivers with kubernetes? I assume that hostpath just works. What other options exist?

On paper, ZFS lets you grant granular zfs allow permissions to a user for a pool or dataset without directly granting them the mount syscall, which could be used to enable most of the features of openebs zfs-localpv, but I have no idea if it can take advantage of it in a rootless setting.

Then there's the FUSE filesystem route, which should have a lot of potential but where I'm not an expert by any means