--- zzzz-none-000/linux-3.10.107/fs/nfs/nfs4session.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/fs/nfs/nfs4session.c	2021-02-04 17:41:59.000000000 +0000
@@ -23,6 +23,14 @@
 
 #define NFSDBG_FACILITY		NFSDBG_STATE
 
+static void nfs4_init_slot_table(struct nfs4_slot_table *tbl, const char *queue)
+{
+	tbl->highest_used_slotid = NFS4_NO_SLOT;
+	spin_lock_init(&tbl->slot_tbl_lock);
+	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, queue);
+	init_completion(&tbl->complete);
+}
+
 /*
  * nfs4_shrink_slot_table - free retired slots from the slot table
  */
@@ -44,6 +52,17 @@
 	}
 }
 
+/**
+ * nfs4_slot_tbl_drain_complete - wake waiters when drain is complete
+ * @tbl - controlling slot table
+ *
+ */
+void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl)
+{
+	if (nfs4_slot_tbl_draining(tbl))
+		complete(&tbl->complete);
+}
+
 /*
  * nfs4_free_slot - free a slot and efficiently update slot table.
  *
@@ -76,7 +95,7 @@
 			nfs4_slot_tbl_drain_complete(tbl);
 		}
 	}
-	dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
+	dprintk("%s: slotid %u highest_used_slotid %u\n", __func__,
 		slotid, tbl->highest_used_slotid);
 }
 
@@ -146,9 +165,9 @@
 	ret->generation = tbl->generation;
 
 out:
-	dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
+	dprintk("<-- %s used_slots=%04lx highest_used=%u slotid=%u\n",
 		__func__, tbl->used_slots[0], tbl->highest_used_slotid,
-		!IS_ERR(ret) ? ret->slot_nr : -1);
+		!IS_ERR(ret) ? ret->slot_nr : NFS4_NO_SLOT);
 	return ret;
 }
 
@@ -191,7 +210,7 @@
 {
 	int ret;
 
-	dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
+	dprintk("--> %s: max_reqs=%u, tbl->max_slots %u\n", __func__,
 		max_reqs, tbl->max_slots);
 
 	if (max_reqs > NFS4_MAX_SLOT_TABLE)
@@ -205,18 +224,45 @@
 	nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue);
 	spin_unlock(&tbl->slot_tbl_lock);
 
-	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
+	dprintk("%s: tbl=%p slots=%p max_slots=%u\n", __func__,
 		tbl, tbl->slots, tbl->max_slots);
 out:
 	dprintk("<-- %s: return %d\n", __func__, ret);
 	return ret;
 }
 
-/* Destroy the slot table */
-static void nfs4_destroy_slot_tables(struct nfs4_session *session)
+/*
+ * nfs4_release_slot_table - release all slot table entries
+ */
+static void nfs4_release_slot_table(struct nfs4_slot_table *tbl)
+{
+	nfs4_shrink_slot_table(tbl, 0);
+}
+
+/**
+ * nfs4_shutdown_slot_table - release resources attached to a slot table
+ * @tbl: slot table to shut down
+ *
+ */
+void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl)
 {
-	nfs4_shrink_slot_table(&session->fc_slot_table, 0);
-	nfs4_shrink_slot_table(&session->bc_slot_table, 0);
+	nfs4_release_slot_table(tbl);
+	rpc_destroy_wait_queue(&tbl->slot_tbl_waitq);
+}
+
+/**
+ * nfs4_setup_slot_table - prepare a stand-alone slot table for use
+ * @tbl: slot table to set up
+ * @max_reqs: maximum number of requests allowed
+ * @queue: name to give RPC wait queue
+ *
+ * Returns zero on success, or a negative errno.
+ */
+int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, unsigned int max_reqs,
+		const char *queue)
+{
+	nfs4_init_slot_table(tbl, queue);
+	return nfs4_realloc_slot_table(tbl, max_reqs, 0);
 }
 
 static bool nfs41_assign_slot(struct rpc_task *task, void *pslot)
@@ -273,6 +319,8 @@
 	}
 }
 
+#if defined(CONFIG_NFS_V4_1)
+
 static void nfs41_set_max_slotid_locked(struct nfs4_slot_table *tbl,
 		u32 target_highest_slotid)
 {
@@ -383,6 +431,12 @@
 	spin_unlock(&tbl->slot_tbl_lock);
 }
 
+static void nfs4_release_session_slot_tables(struct nfs4_session *session)
+{
+	nfs4_release_slot_table(&session->fc_slot_table);
+	nfs4_release_slot_table(&session->bc_slot_table);
+}
+
 /*
  * Initialize or reset the forechannel and backchannel tables
  */
@@ -396,7 +450,7 @@
 	tbl = &ses->fc_slot_table;
 	tbl->session = ses;
 	status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
-	if (status) /* -ENOMEM */
+	if (status || !(ses->flags & SESSION4_BACK_CHAN)) /* -ENOMEM */
 		return status;
 	/* Back channel */
 	tbl = &ses->bc_slot_table;
@@ -405,43 +459,38 @@
 	if (status && tbl->slots == NULL)
 		/* Fore and back channel share a connection so get
 		 * both slot tables or neither */
-		nfs4_destroy_slot_tables(ses);
+		nfs4_release_session_slot_tables(ses);
 	return status;
 }
 
 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
 {
 	struct nfs4_session *session;
-	struct nfs4_slot_table *tbl;
 
 	session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
 	if (!session)
 		return NULL;
 
-	tbl = &session->fc_slot_table;
-	tbl->highest_used_slotid = NFS4_NO_SLOT;
-	spin_lock_init(&tbl->slot_tbl_lock);
-	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
-	init_completion(&tbl->complete);
-
-	tbl = &session->bc_slot_table;
-	tbl->highest_used_slotid = NFS4_NO_SLOT;
-	spin_lock_init(&tbl->slot_tbl_lock);
-	rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
-	init_completion(&tbl->complete);
-
+	nfs4_init_slot_table(&session->fc_slot_table, "ForeChannel Slot table");
+	nfs4_init_slot_table(&session->bc_slot_table, "BackChannel Slot table");
 	session->session_state = 1<<NFS4_SESSION_INITING;
 
 	session->clp = clp;
 	return session;
 }
 
+static void nfs4_destroy_session_slot_tables(struct nfs4_session *session)
+{
+	nfs4_shutdown_slot_table(&session->fc_slot_table);
+	nfs4_shutdown_slot_table(&session->bc_slot_table);
+}
+
 void nfs4_destroy_session(struct nfs4_session *session)
 {
 	struct rpc_xprt *xprt;
 	struct rpc_cred *cred;
 
-	cred = nfs4_get_exchange_id_cred(session->clp);
+	cred = nfs4_get_clid_cred(session->clp);
 	nfs4_proc_destroy_session(session, cred);
 	if (cred)
 		put_rpccred(cred);
@@ -452,7 +501,7 @@
 	dprintk("%s Destroy backchannel for xprt %p\n",
 		__func__, xprt);
 	xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
-	nfs4_destroy_slot_tables(session);
+	nfs4_destroy_session_slot_tables(session);
 	kfree(session);
 }
 
@@ -478,48 +527,12 @@
 	return 0;
 }
 
-int nfs4_init_session(struct nfs_server *server)
+int nfs4_init_session(struct nfs_client *clp)
 {
-	struct nfs_client *clp = server->nfs_client;
-	struct nfs4_session *session;
-	unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE;
-	unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE;
-
 	if (!nfs4_has_session(clp))
 		return 0;
 
-	if (server->rsize != 0)
-		target_max_resp_sz = server->rsize;
-	target_max_resp_sz += nfs41_maxread_overhead;
-
-	if (server->wsize != 0)
-		target_max_rqst_sz = server->wsize;
-	target_max_rqst_sz += nfs41_maxwrite_overhead;
-
-	session = clp->cl_session;
-	spin_lock(&clp->cl_lock);
-	if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
-		/* Initialise targets and channel attributes */
-		session->fc_target_max_rqst_sz = target_max_rqst_sz;
-		session->fc_attrs.max_rqst_sz = target_max_rqst_sz;
-		session->fc_target_max_resp_sz = target_max_resp_sz;
-		session->fc_attrs.max_resp_sz = target_max_resp_sz;
-	} else {
-		/* Just adjust the targets */
-		if (target_max_rqst_sz > session->fc_target_max_rqst_sz) {
-			session->fc_target_max_rqst_sz = target_max_rqst_sz;
-			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
-		}
-		if (target_max_resp_sz > session->fc_target_max_resp_sz) {
-			session->fc_target_max_resp_sz = target_max_resp_sz;
-			set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
-		}
-	}
-	spin_unlock(&clp->cl_lock);
-
-	if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
-		nfs4_schedule_lease_recovery(clp);
-
+	clear_bit(NFS4_SESSION_INITING, &clp->cl_session->session_state);
 	return nfs41_check_session_ready(clp);
 }
 
@@ -549,4 +562,4 @@
 }
 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
 
-
+#endif	/* defined(CONFIG_NFS_V4_1) */