NFSv4.1: Remove the 'FIFO' behaviour for nfs41_setup_sequence

It is more important to preserve the task priority behaviour, which ensures
that things like reclaim writes take precedence over background and kupdate
writes.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4_fs.h

@@ -236,7 +236,6 @@ static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *ser
 	return server->nfs_client->cl_session;
 }
 
-extern bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy);
 extern int nfs4_setup_sequence(const struct nfs_server *server,
 		struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 		struct rpc_task *task);

fs/nfs/nfs4proc.c

@@ -379,12 +379,6 @@ static void renew_lease(const struct nfs_server *server, unsigned long timestamp
 
 #if defined(CONFIG_NFS_V4_1)
 
-bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
-{
-	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
-	return true;
-}
-
 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 {
 	struct nfs4_session *session;
@@ -412,8 +406,7 @@ static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 	if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 		send_new_highest_used_slotid = false;
 	if (!nfs4_session_draining(session)) {
-		if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
-				nfs4_set_task_privileged, NULL) != NULL)
+		if (rpc_wake_up_next(&tbl->slot_tbl_waitq) != NULL)
 			send_new_highest_used_slotid = false;
 	}
 	spin_unlock(&tbl->slot_tbl_lock);
@@ -527,12 +520,6 @@ int nfs41_setup_sequence(struct nfs4_session *session,
 		goto out_sleep;
 	}
 
-	if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
-	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
-		dprintk("%s enforce FIFO order\n", __func__);
-		goto out_sleep;
-	}
-
 	slot = nfs4_alloc_slot(tbl);
 	if (IS_ERR(slot)) {
 		/* If out of memory, try again in 1/4 second */

fs/nfs/nfs4state.c

@@ -263,9 +263,7 @@ static void nfs4_end_drain_session(struct nfs_client *clp)
 	if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 		spin_lock(&tbl->slot_tbl_lock);
 		for (i = 0; i <= tbl->max_slotid; i++) {
-			if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
-						nfs4_set_task_privileged,
-						NULL) == NULL)
+			if (rpc_wake_up_next(&tbl->slot_tbl_waitq) == NULL)
 				break;
 		}
 		spin_unlock(&tbl->slot_tbl_lock);