On Sun, 2009-12-06 at 03:16 -0800, Ricardo Labiaga wrote:
> If CREATE_SESSION fails with NFS4ERR_STALE_CLIENTID, don't clear the
> NFS4CLNT_SESSION_DRAINING flag and don't wake RPCs waiting for the
> session to be reestablished. We don't have a session yet, so there
> is no reason to wake other RPCs.
>
> This avoids sending spurious compounds with bogus sequenceID during
> session and state recovery.
How about the following instead? It ensures that we drain the session
before renewing the lease too.
Cheers
Trond
---------------------------------------------------------------------------------------
nfs41: Don't clear DRAINING flag on NFS4ERR_STALE_CLIENTID
From: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
If CREATE_SESSION fails with NFS4ERR_STALE_CLIENTID, don't clear the
NFS4CLNT_SESSION_DRAINING flag and don't wake RPCs waiting for the
session to be reestablished. We don't have a session yet, so there
is no reason to wake other RPCs.
This avoids sending spurious compounds with bogus sequenceID during
session and state recovery.
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
[Trond.Myklebust@xxxxxxxxxx: cleaned up patch by adding the
nfs41_begin/end_drain_session() helpers]
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 2 ++
fs/nfs/nfs4state.c | 59 ++++++++++++++++++++++++++++++++++++----------------
2 files changed, 43 insertions(+), 18 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4be0369..fbae2c9 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4586,10 +4586,12 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
init_completion(&session->complete);
tbl = &session->fc_slot_table;
+ tbl->highest_used_slotid = -1;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
tbl = &session->bc_slot_table;
+ tbl->highest_used_slotid = -1;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 9cfe686..1b629cc 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -135,16 +135,43 @@ static int nfs41_setup_state_renewal(struct nfs_client *clp)
return status;
}
+static void nfs41_end_drain_session(struct nfs_client *clp,
+ struct nfs4_session *ses)
+{
+ if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state))
+ rpc_wake_up(&ses->fc_slot_table.slot_tbl_waitq);
+}
+
+static int nfs41_begin_drain_session(struct nfs_client *clp,
+ struct nfs4_session *ses)
+{
+ struct nfs4_slot_table *tbl = &ses->fc_slot_table;
+
+ spin_lock(&tbl->slot_tbl_lock);
+ set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
+ if (tbl->highest_used_slotid != -1) {
+ INIT_COMPLETION(ses->complete);
+ spin_unlock(&tbl->slot_tbl_lock);
+ return wait_for_completion_interruptible(&ses->complete);
+ }
+ spin_unlock(&tbl->slot_tbl_lock);
+ return 0;
+}
+
int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
{
int status;
+ status = nfs41_begin_drain_session(clp, clp->cl_session);
+ if (status != 0)
+ goto out;
status = nfs4_proc_exchange_id(clp, cred);
if (status != 0)
goto out;
status = nfs4_proc_create_session(clp);
if (status != 0)
goto out;
+ nfs41_end_drain_session(clp, clp->cl_session);
nfs41_setup_state_renewal(clp);
nfs_mark_client_ready(clp, NFS_CS_READY);
out:
@@ -1239,20 +1266,11 @@ static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
static int nfs4_reset_session(struct nfs_client *clp)
{
struct nfs4_session *ses = clp->cl_session;
- struct nfs4_slot_table *tbl = &ses->fc_slot_table;
int status;
- spin_lock(&tbl->slot_tbl_lock);
- set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
- if (tbl->highest_used_slotid != -1) {
- INIT_COMPLETION(ses->complete);
- spin_unlock(&tbl->slot_tbl_lock);
- status = wait_for_completion_interruptible(&ses->complete);
- if (status) /* -ERESTARTSYS */
- goto out;
- } else {
- spin_unlock(&tbl->slot_tbl_lock);
- }
+ status = nfs41_begin_drain_session(clp, ses);
+ if (status != 0)
+ return status;
status = nfs4_proc_destroy_session(clp->cl_session);
if (status && status != -NFS4ERR_BADSESSION &&
@@ -1265,13 +1283,18 @@ static int nfs4_reset_session(struct nfs_client *clp)
status = nfs4_proc_create_session(clp);
if (status)
nfs4_session_recovery_handle_error(clp, status);
- /* fall through*/
+
out:
- /* Wake up the next rpc task even on error */
- clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
- rpc_wake_up(&clp->cl_session->fc_slot_table.slot_tbl_waitq);
- if (status == 0)
- nfs41_setup_state_renewal(clp);
+ /*
+ * Let the state manager reestablish state
+ * without waking other tasks yet.
+ */
+ if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
+ /* Wake up the next rpc task */
+ nfs41_end_drain_session(clp, ses);
+ if (status == 0)
+ nfs41_setup_state_renewal(clp);
+ }
return status;
}
--
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