Trying to mount my custom nfs4d server (a 4.1 server) using
mount -t nfs -o nfsvers=4,minorversion=1 127.0.0.1:/ /test
results in
NFS: state manager failed on NFSv4 server 127.0.0.1 with error 22
Error 22 is NFS4ERR_INVAL, but that error is never sent on the wire
(note NFS4_OK is returned for EXCHANGE_ID and CREATE_SESSION):
(RPC message #1 from Linux kernel)
nfs4d[14205]: client ::ffff:127.0.0.1 connected
nfs4d[14205]: RPC frag (40 bytes, LAST)
nfs4d[14205]: RPC: message (40 bytes, xid 3375e730, proc 0)
nfs4d[14205]: NULL proc invoked
nfs4d[14205]: RPC reply: 28 bytes, 1 writes
(RPC message #2 from Linux kernel)
nfs4d[14205]: RPC frag (256 bytes, LAST)
nfs4d[14205]: RPC: message (256 bytes, xid 3475e730, proc 1)
nfs4d[14205]: RPC CRED Unix (uid 0 gid 0 len 44)
nfs4d[14205]: op EXCHANGE_ID (127.0.0.1/localhost.localdomain/1, 1)
nfs4d[14205]: clientid 3cde47d62cea0bf6, seq 0, flg 10001
nfs4d[14205]: compound end (1 args, 1 results, status NFS4_OK)
nfs4d[14205]: RPC reply: 104 bytes, 1 writes
(RPC message #3 from Linux kernel)
nfs4d[14205]: RPC frag (216 bytes, LAST)
nfs4d[14205]: RPC: message (216 bytes, xid 3575e730, proc 1)
nfs4d[14205]: RPC CRED Unix (uid 0 gid 0 len 44)
nfs4d[14205]: op CREATE_SESSION (clid 3cde47d62cea0bf6, seq 0, flg 3)
nfs4d[14205]: sess id 68035f7e74ffff1d0000000000000000, seq 0, flg 3
nfs4d[14205]: compound end (1 args, 1 results, status NFS4_OK)
nfs4d[14205]: RPC reply: 128 bytes, 1 writes
Source code for the server is here, for the curious:
https://github.com/jgarzik/nfs4d
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