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NFSv4.1: Use seqid returned by EXCHANGE_ID after state migration
Transparent State Migration copies a client's lease state from the server where a filesystem used to reside to the server where it now resides. When an NFSv4.1 client first contacts that destination server, it uses EXCHANGE_ID to detect trunking relationships. The lease that was copied there is returned to that client, but the destination server sets EXCHGID4_FLAG_CONFIRMED_R when replying to the client. This is because the lease was confirmed on the source server (before it was copied). When CONFIRMED_R is set, the client throws away the sequence ID returned by the server. During a Transparent State Migration, however there's no other way for the client to know what sequence ID to use with a lease that's been migrated. Therefore, the client must save and use the contrived slot sequence value returned by the destination server even when CONFIRMED_R is set. Note that some servers always return a seqid of 1 after a migration. Reported-by: Xuan Qi <xuan.qi@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Xuan Qi <xuan.qi@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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1 changed files with 3 additions and 4 deletions
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@ -7378,12 +7378,11 @@ static void nfs4_exchange_id_done(struct rpc_task *task, void *data)
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if (status == 0) {
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clp->cl_clientid = cdata->res.clientid;
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clp->cl_exchange_flags = cdata->res.flags;
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clp->cl_seqid = cdata->res.seqid;
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/* Client ID is not confirmed */
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if (!(cdata->res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
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if (!(cdata->res.flags & EXCHGID4_FLAG_CONFIRMED_R))
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clear_bit(NFS4_SESSION_ESTABLISHED,
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&clp->cl_session->session_state);
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clp->cl_seqid = cdata->res.seqid;
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}
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&clp->cl_session->session_state);
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kfree(clp->cl_serverowner);
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clp->cl_serverowner = cdata->res.server_owner;
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