1 files changed, 34 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ed6c8899806d..a2855391b079 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -423,6 +423,22 @@ out:
         return ret_id;
 }
 
+static int nfs4_recover_session(struct nfs4_session *session)
+{
+        struct nfs_client *clp = session->clp;
+        int ret;
+
+        for (;;) {
+                ret = nfs4_wait_clnt_recover(clp);
+                if (ret != 0)
+                                return ret;
+                if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
+                        break;
+                nfs4_schedule_state_manager(clp);
+        }
+        return 0;
+}
+
 static int nfs41_setup_sequence(struct nfs4_session *session,
                                 struct nfs4_sequence_args *args,
                                 struct nfs4_sequence_res *res,
@@ -431,6 +447,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
 {
         struct nfs4_slot *slot;
         struct nfs4_slot_table *tbl;
+        int status = 0;
         u8 slotid;
 
         dprintk("--> %s\n", __func__);
@@ -443,6 +460,23 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
         tbl = &session->fc_slot_table;
 
         spin_lock(&tbl->slot_tbl_lock);
+        if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
+                if (tbl->highest_used_slotid != -1) {
+                        rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+                        spin_unlock(&tbl->slot_tbl_lock);
+                        dprintk("<-- %s: Session reset: draining\n", __func__);
+                        return -EAGAIN;
+                }
+
+                /* The slot table is empty; start the reset thread */
+                dprintk("%s Session Reset\n", __func__);
+                spin_unlock(&tbl->slot_tbl_lock);
+                status = nfs4_recover_session(session);
+                if (status)
+                        return status;
+                spin_lock(&tbl->slot_tbl_lock);
+        }
+
         slotid = nfs4_find_slot(tbl, task);
         if (slotid == NFS4_MAX_SLOT_TABLE) {
                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);