The memory region(MR) is very similar to RDMA memory region, however
much simpler. It allows userspace to register a bulky memory to kernel,
which would pin all pages from that memory and returns a reference back
to userspace. Userspace can then just pass the descriptor(start address,
length) of a
Currently there are 2 connections for every RPC, one in userspace,
one in kernel. This wastes a lot of resources on client hosts in case
of a huge cluster. It's therefore desirable to eliminate connections
in userspace by using kernel RPC directly for userspace RPC.
This patch makes the pcs_fuse_k
