NFS client virtualization plan v2

[Stanislav Kinsbursky <skinsbursky@parallels.com>]

Hello.
This is an update for this plan. Added rpc_pipefs and NFS cache virtualization.

==============================================================================

"NFS client" virtualization plan:

_RPC layer_:

1) Make rpcbind clients (rpcb_local_clnt and rpcb_local4_clnt) to be
per net namespace.

2) Make RPC pipefs to be per net namespace.

_NFS layer_:

1) Net namespace inheritance (current->nsproxy->net have to be used instead
of init_net).
Pointer to net namespace can be stored on nfs_client structure, which will
give easy access to proper net namespace during RPC transports creation.

2) Make Lockd kthread able to handle requests from different net namespaces.

3) Make NFS callbacks kthreads (nfs4_callback_svc and nfs4.1_callback_svc) able
to handle requests from different net namespaces.

4) Make NFS info lists (nfs_volume_list and nfs_client_list) to be per
net namespace in addition to global ones.

5) Make NFS proc variables and it's internal content variables to be per
net namespace in addition to global ones.

6) Make NFS sysctl variables and it's internal content variables to be per
net namespace in addition to global ones.

7) Make NFS cache per net namespace.



-- 
Best regards,
Stanislav Kinsbursky
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