Chuck Lever de73483122
NFS: Treat NFS4ERR_CLID_INUSE as a fatal error ...
For NFSv4 minor version 0, currently the cl_id_uniquifier allows the
Linux client to generate a unique nfs_client_id4 string whenever a
server replies with NFS4ERR_CLID_INUSE.
This implementation seems to be based on a flawed reading of RFC
3530. NFS4ERR_CLID_INUSE actually means that the client has presented
this nfs_client_id4 string with a different principal at some time in
the past, and that lease is still in use on the server.
For a Linux client this might be rather difficult to achieve: the
authentication flavor is named right in the nfs_client_id4.id
string. If we change flavors, we change strings automatically.
So, practically speaking, NFS4ERR_CLID_INUSE means there is some other
client using our string. There is not much that can be done to
recover automatically. Let's make it a permanent error.
Remove the recovery logic in nfs4_proc_setclientid(), and remove the
cl_id_uniquifier field from the nfs_client data structure. And,
remove the authentication flavor from the nfs_client_id4 string.
Keeping the authentication flavor in the nfs_client_id4.id string
means that we could have a separate lease for each authentication
flavor used by mounts on the client. But we want just one lease for
all the mounts on this client.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com >
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com >
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de73483122