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NFSv4.1: Clear the old state by our client id before establishing a new lease

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If the call to exchange-id returns with the EXCHGID4_FLAG_CONFIRMED_R flag
set, then that means our lease was established by a previous mount instance.
Ensure that we detect this situation, and that we clear the state held by
that mount.

Reported-by: Jorge Mora <Jorge.Mora@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2015-03-03 20:35:31 -05:00
parent 48d66b9749
commit e11259f920
3 changed files with 17 additions and 5 deletions
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15
fs/nfs/nfs4proc.c
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@@ -6897,9 +6897,13 @@ static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
if (status == 0) {
clp->cl_clientid = res.clientid;
clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
clp->cl_exchange_flags = res.flags;
/* Client ID is not confirmed */
if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
clear_bit(NFS4_SESSION_ESTABLISHED,
&clp->cl_session->session_state);
clp->cl_seqid = res.seqid;
}
kfree(clp->cl_serverowner);
clp->cl_serverowner = res.server_owner;
@@ -7231,6 +7235,9 @@ static void nfs4_update_session(struct nfs4_session *session,
struct nfs41_create_session_res *res)
{
nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
/* Mark client id and session as being confirmed */
session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
session->flags = res->flags;
memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
if (res->flags & SESSION4_BACK_CHAN)
@@ -7326,8 +7333,8 @@ int nfs4_proc_destroy_session(struct nfs4_session *session,
dprintk("--> nfs4_proc_destroy_session\n");
/* session is still being setup */
if (session->clp->cl_cons_state != NFS_CS_READY)
return status;
if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
return 0;
status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
trace_nfs4_destroy_session(session->clp, status);