Re: [PATCH 1/2] nfs41: nfs41_setup_state_renewal

[Trond Myklebust <Trond.Myklebust@netapp.com>]

On Sun, 2009-12-06 at 03:16 -0800, Ricardo Labiaga wrote: 
> Move call to get the lease time and the setup of the state
> renewal out of nfs4_create_session so that it can be called
> after clearing the DRAINING flag.  We use the getattr RPC
> to obtain the lease time, which requires a sequence slot.
> 
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
<snip> 
> 	status = nfs4_proc_exchange_id(clp, cred);
>  	if (status == 0)
> -		/* create session schedules state renewal upon success */
>  		status = nfs4_proc_create_session(clp);
> +	if (status == 0 && test_and_clear_bit(
> +			NFS4CLNT_SESSION_DRAINING, &clp->cl_state))
> +		rpc_wake_up(&clp->cl_session->fc_slot_table.slot_tbl_waitq);

This was clearly supposed to be part of PATCH 2/2...

> +	if (status == 0)
> +		nfs41_setup_state_renewal(clp);

Hrm... Lots of tests of 'status == 0' without status actually changing.
I've fixed this up (see below).

> 	if (status == 0)
>  		nfs_mark_client_ready(clp, NFS_CS_READY);
>  	return status;

------------------------------------------------------------------------------------------------------- 
nfs41: nfs41_setup_state_renewal

From: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>

Move call to get the lease time and the setup of the state
renewal out of nfs4_create_session so that it can be called
after clearing the DRAINING flag.  We use the getattr RPC
to obtain the lease time, which requires a sequence slot.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

 fs/nfs/nfs4_fs.h   |    2 ++
 fs/nfs/nfs4proc.c  |   13 -------------
 fs/nfs/nfs4state.c |   34 +++++++++++++++++++++++++++++-----
 3 files changed, 31 insertions(+), 18 deletions(-)


diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 50dd550..7e57b04 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -225,6 +225,8 @@ extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
 extern int nfs4_proc_create_session(struct nfs_client *);
 extern int nfs4_proc_destroy_session(struct nfs4_session *);
 extern int nfs4_init_session(struct nfs_server *server);
+extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
+		struct nfs_fsinfo *fsinfo);
 #else /* CONFIG_NFS_v4_1 */
 static inline int nfs4_setup_sequence(struct nfs_client *clp,
 		struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b4ef570..4be0369 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4745,7 +4745,6 @@ int nfs4_proc_create_session(struct nfs_client *clp)
 {
 	int status;
 	unsigned *ptr;
-	struct nfs_fsinfo fsinfo;
 	struct nfs4_session *session = clp->cl_session;
 
 	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
@@ -4767,18 +4766,6 @@ int nfs4_proc_create_session(struct nfs_client *clp)
 	ptr = (unsigned *)&session->sess_id.data[0];
 	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
 		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
-
-	/* Get the lease time */
-	status = nfs4_proc_get_lease_time(clp, &fsinfo);
-	if (status == 0) {
-		/* Update lease time and schedule renewal */
-		spin_lock(&clp->cl_lock);
-		clp->cl_lease_time = fsinfo.lease_time * HZ;
-		clp->cl_last_renewal = jiffies;
-		spin_unlock(&clp->cl_lock);
-
-		nfs4_schedule_state_renewal(clp);
-	}
 out:
 	dprintk("<-- %s\n", __func__);
 	return status;
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index ef9622e..9cfe686 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -116,16 +116,38 @@ struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 
 #if defined(CONFIG_NFS_V4_1)
 
+static int nfs41_setup_state_renewal(struct nfs_client *clp)
+{
+	int status;
+	struct nfs_fsinfo fsinfo;
+
+	status = nfs4_proc_get_lease_time(clp, &fsinfo);
+	if (status == 0) {
+		/* Update lease time and schedule renewal */
+		spin_lock(&clp->cl_lock);
+		clp->cl_lease_time = fsinfo.lease_time * HZ;
+		clp->cl_last_renewal = jiffies;
+		spin_unlock(&clp->cl_lock);
+
+		nfs4_schedule_state_renewal(clp);
+	}
+
+	return status;
+}
+
 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 {
 	int status;
 
 	status = nfs4_proc_exchange_id(clp, cred);
-	if (status == 0)
-		/* create session schedules state renewal upon success */
-		status = nfs4_proc_create_session(clp);
-	if (status == 0)
-		nfs_mark_client_ready(clp, NFS_CS_READY);
+	if (status != 0)
+		goto out;
+	status = nfs4_proc_create_session(clp);
+	if (status != 0)
+		goto out;
+	nfs41_setup_state_renewal(clp);
+	nfs_mark_client_ready(clp, NFS_CS_READY);
+out:
 	return status;
 }
 
@@ -1248,6 +1270,8 @@ 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);
 	return status;
 }