nfs41: add session setup to the state manager

At mount, nfs_alloc_client sets the cl_state NFS4CLNT_LEASE_EXPIRED bit
and nfs4_alloc_session sets the NFS4CLNT_SESSION_SETUP bit, so both bits are
set when nfs4_lookup_root calls nfs4_recover_expired_lease which schedules
the nfs4_state_manager and waits for it to complete.

Place the session setup after the clientid establishment in nfs4_state_manager
so that the session is setup right after the clientid has been established
without rescheduling the state manager.

Unlike nfsv4.0, the nfs_client struct is not ready to use until the session
has been established.  Postpone marking the nfs_client struct to NFS_CS_READY
until after a successful CREATE_SESSION call so that other threads cannot use
the client until the session is established.

If the EXCHANGE_ID call fails and the session has not been setup (the
NFS4CLNT_SESSION_SETUP bit is set), mark the client with the error and return.

If the session setup CREATE_SESSION call fails with NFS4ERR_STALE_CLIENTID
which could occur due to server reboot or network partition inbetween the
EXCHANGE_ID and CREATE_SESSION call, reset the NFS4CLNT_LEASE_EXPIRED and
NFS4CLNT_SESSION_SETUP bits and try again.

If the CREATE_SESSION call fails with other errors, mark the client with
the error and return.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

[nfs41: NFS_CS_SESSION_SETUP cl_cons_state for back channel setup]
  On session setup, the CREATE_SESSION reply races with the server back channel
  probe which needs to succeed to setup the back channel. Set a new
  cl_cons_state NFS_CS_SESSION_SETUP just prior to the CREATE_SESSION call
  and add it as a valid state to nfs_find_client so that the client back channel
  can find the nfs_client struct and won't drop the server backchannel probe.
  Use a new cl_cons_state so that NFSv4.0 back channel behaviour which only
  sets NFS_CS_READY is unchanged.
  Adjust waiting on the nfs_client_active_wq accordingly.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

[nfs41: rename NFS_CS_SESSION_SETUP to NFS_CS_SESSION_INITING]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: set NFS_CL_SESSION_INITING in alloc_session]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: move session setup into a function]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[moved nfs4_proc_create_session declaration here]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

5 files changed, 53 insertions, 5 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index bb7432d83b5a..d28a987f569e 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -366,7 +366,8 @@ struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
                 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 
                 /* Don't match clients that failed to initialise properly */
-                if (clp->cl_cons_state != NFS_CS_READY)
+                if (!(clp->cl_cons_state == NFS_CS_READY ||
+                      clp->cl_cons_state == NFS_CS_SESSION_INITING))
                         continue;
 
                 /* Different NFS versions cannot share the same nfs_client */
@@ -499,7 +500,7 @@ found_client:
                 nfs_free_client(new);
 
         error = wait_event_killable(nfs_client_active_wq,
-                                clp->cl_cons_state != NFS_CS_INITING);
+                                clp->cl_cons_state < NFS_CS_INITING);
         if (error < 0) {
                 nfs_put_client(clp);
                 return ERR_PTR(-ERESTARTSYS);
@@ -520,7 +521,7 @@ found_client:
 /*
  * Mark a server as ready or failed
  */
-static void nfs_mark_client_ready(struct nfs_client *clp, int state)
+void nfs_mark_client_ready(struct nfs_client *clp, int state)
 {
         clp->cl_cons_state = state;
         wake_up_all(&nfs_client_active_wq);
@@ -1135,7 +1136,8 @@ static int nfs4_init_client(struct nfs_client *clp,
         if (error < 0)
                 goto error;
 
-        nfs_mark_client_ready(clp, NFS_CS_READY);
+        if (!nfs4_has_session(clp))
+                nfs_mark_client_ready(clp, NFS_CS_READY);
         return 0;
 
 error:
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index f62bc5226155..f3b310e8ea03 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -100,6 +100,7 @@ extern void nfs_free_server(struct nfs_server *server);
 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
                                            struct nfs_fh *,
                                            struct nfs_fattr *);
+extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 #ifdef CONFIG_PROC_FS
 extern int __init nfs_fs_proc_init(void);
 extern void nfs_fs_proc_exit(void);
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index eccf4e93e7d7..288717abaddc 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -44,6 +44,7 @@ enum nfs4_client_state {
         NFS4CLNT_RECLAIM_REBOOT,
         NFS4CLNT_RECLAIM_NOGRACE,
         NFS4CLNT_DELEGRETURN,
+        NFS4CLNT_SESSION_SETUP,
 };
 
 /*
@@ -208,6 +209,7 @@ extern int nfs4_setup_sequence(struct nfs_client *clp,
                 int cache_reply, struct rpc_task *task);
 extern void nfs4_destroy_session(struct nfs4_session *session);
 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
+extern int nfs4_proc_create_session(struct nfs_client *, int reset);
 #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 0b1214740248..7fc0c9c8f5e3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4382,6 +4382,16 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
         if (!session)
                 return NULL;
+
+        set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
+        /*
+         * The create session reply races with the server back
+         * channel probe. Mark the client NFS_CS_SESSION_INITING
+         * so that the client back channel can find the
+         * nfs_client struct
+         */
+        clp->cl_cons_state = NFS_CS_SESSION_INITING;
+
         tbl = &session->fc_slot_table;
         spin_lock_init(&tbl->slot_tbl_lock);
         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index bc683ed477e1..df5b4807daa7 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1113,6 +1113,27 @@ static int nfs4_reclaim_lease(struct nfs_client *clp)
         return status;
 }
 
+#ifdef CONFIG_NFS_V4_1
+
+static int nfs4_initialize_session(struct nfs_client *clp)
+{
+        int status;
+
+        status = nfs4_proc_create_session(clp, 0);
+        if (!status) {
+                nfs_mark_client_ready(clp, NFS_CS_READY);
+        } else if (status == -NFS4ERR_STALE_CLIENTID) {
+                set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
+        } else {
+                nfs_mark_client_ready(clp, status);
+        }
+        return status;
+}
+#else /* CONFIG_NFS_V4_1 */
+static int nfs4_initialize_session(struct nfs_client *clp) { return 0; }
+#endif /* CONFIG_NFS_V4_1 */
+
 static void nfs4_state_manager(struct nfs_client *clp)
 {
         int status = 0;
@@ -1126,6 +1147,9 @@ static void nfs4_state_manager(struct nfs_client *clp)
                                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
                                 if (status == -EAGAIN)
                                         continue;
+                                if (clp->cl_cons_state ==
+                                                        NFS_CS_SESSION_INITING)
+                                        nfs_mark_client_ready(clp, status);
                                 goto out_error;
                         }
                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
@@ -1136,7 +1160,16 @@ static void nfs4_state_manager(struct nfs_client *clp)
                         if (status != 0)
                                 continue;
                 }
-
+                /* Setup the session */
+                if (nfs4_has_session(clp) &&
+                   test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
+                        status = nfs4_initialize_session(clp);
+                        if (status) {
+                                if (status == -NFS4ERR_STALE_CLIENTID)
+                                        continue;
+                                goto out_error;
+                        }
+                }
                 /* First recover reboot state... */
                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
                         status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);