rfs41_* - Related to NFSv4.1 server only
rfs40_* - Related to NFSv4.0 server only
rfs4x_* - Related to NFSv4 server, independent of minor version
nfs41_* Related to NFSv4.1 client only
nfs40_* - Related to NFSv4.0 client only
nfs4x_* - Related to NFSv4 client, independent of minor version
nfs41_common_* - Related to NFSv4.1 client and server
nfs40_common_* - Related to NFSv4.0 client and server
nfs4x_common_* - Related to NFSv4 client and server, independent of minor version
(Note: When talking about the control protocol, the entity that follows the "ctl_" tag refers to the place that the control protocol message was initiated from. For example, PNFS_CTL_MDS means that the message was initiated from the MDS. PNFS_CTL_DS means that the message was initiated from the DS.)
ctl_mds_* - Related to the MDS to DS control protocol (PNFS_CTL_MDS)
ctl_mds_clnt_* - Related to the client side (MDS) of the MDS to DS control protocol (PNFS_CTL_MDS)
ctl_mds_srv_* - Related to the server side (DS) of the MDS to DS control protocol (PNFS_CTL_MDS)
ctl_ds_* - Related to the DS to MDS control protocol (PNFS_CTL_DS)
ctl_ds_clnt_* - Related to the client side (DS) of the DS to MDS control protocol (PNFS_CTL_DS)
ctl_ds_srv_* - Related to the server side (MDS) of the DS to MDS control protocol (PNFS_CTL_DS)
nnode_ * - Related to nnodes
nnop_* - Related to operations performed on nnodes
xdr_* - Related to xdr
spe_* - Related to spe