More NFS client fixes for Linux 5.2

Bugfixes:
 - SUNRPC: Fix a credential refcount leak
 - Revert "SUNRPC: Declare RPC timers as TIMER_DEFERRABLE"
 - SUNRPC: Fix xps refcount imbalance on the error path
 - NFS4: Only set creation opendata if O_CREAT
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Merge tag 'nfs-for-5.2-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull more NFS client fixes from Anna Schumaker:
 "These are mostly refcounting issues that people have found recently.
  The revert fixes a suspend recovery performance issue.

   - SUNRPC: Fix a credential refcount leak

   - Revert "SUNRPC: Declare RPC timers as TIMER_DEFERRABLE"

   - SUNRPC: Fix xps refcount imbalance on the error path

   - NFS4: Only set creation opendata if O_CREAT"

* tag 'nfs-for-5.2-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  SUNRPC: Fix a credential refcount leak
  Revert "SUNRPC: Declare RPC timers as TIMER_DEFERRABLE"
  net :sunrpc :clnt :Fix xps refcount imbalance on the error path
  NFS4: Only set creation opendata if O_CREAT

fs/nfs/nfs4proc.c

@@ -1256,10 +1256,20 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 	atomic_inc(&sp->so_count);
 	p->o_arg.open_flags = flags;
 	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
-	p->o_arg.umask = current_umask();
 	p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 	p->o_arg.share_access = nfs4_map_atomic_open_share(server,
 			fmode, flags);
+	if (flags & O_CREAT) {
+		p->o_arg.umask = current_umask();
+		p->o_arg.label = nfs4_label_copy(p->a_label, label);
+		if (c->sattr != NULL && c->sattr->ia_valid != 0) {
+			p->o_arg.u.attrs = &p->attrs;
+			memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
+
+			memcpy(p->o_arg.u.verifier.data, c->verf,
+					sizeof(p->o_arg.u.verifier.data));
+		}
+	}
 	/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 	 * will return permission denied for all bits until close */
 	if (!(flags & O_EXCL)) {
@@ -1283,7 +1293,6 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 	p->o_arg.server = server;
 	p->o_arg.bitmask = nfs4_bitmask(server, label);
 	p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
-	p->o_arg.label = nfs4_label_copy(p->a_label, label);
 	switch (p->o_arg.claim) {
 	case NFS4_OPEN_CLAIM_NULL:
 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
@@ -1296,13 +1305,6 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 		p->o_arg.fh = NFS_FH(d_inode(dentry));
 	}
-	if (c != NULL && c->sattr != NULL && c->sattr->ia_valid != 0) {
-		p->o_arg.u.attrs = &p->attrs;
-		memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
-
-		memcpy(p->o_arg.u.verifier.data, c->verf,
-				sizeof(p->o_arg.u.verifier.data));
-	}
 	p->c_arg.fh = &p->o_res.fh;
 	p->c_arg.stateid = &p->o_res.stateid;
 	p->c_arg.seqid = p->o_arg.seqid;

net/sunrpc/clnt.c

@@ -634,7 +634,6 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
 	new->cl_discrtry = clnt->cl_discrtry;
 	new->cl_chatty = clnt->cl_chatty;
 	new->cl_principal = clnt->cl_principal;
-	new->cl_cred = get_cred(clnt->cl_cred);
 	return new;
 
 out_err:
@@ -2805,6 +2804,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
 	xprt = xprt_iter_xprt(&clnt->cl_xpi);
 	if (xps == NULL || xprt == NULL) {
 		rcu_read_unlock();
+		xprt_switch_put(xps);
 		return -EAGAIN;
 	}
 	resvport = xprt->resvport;

net/sunrpc/sched.c

@@ -250,9 +250,7 @@ static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const c
 	queue->maxpriority = nr_queues - 1;
 	rpc_reset_waitqueue_priority(queue);
 	queue->qlen = 0;
-	timer_setup(&queue->timer_list.timer,
+	timer_setup(&queue->timer_list.timer, __rpc_queue_timer_fn, 0);
-			__rpc_queue_timer_fn,
-			TIMER_DEFERRABLE);
 	INIT_LIST_HEAD(&queue->timer_list.list);
 	rpc_assign_waitqueue_name(queue, qname);
 }

net/sunrpc/xprt.c

@@ -1876,9 +1876,7 @@ found:
 		xprt->idle_timeout = 0;
 	INIT_WORK(&xprt->task_cleanup, xprt_autoclose);
 	if (xprt_has_timer(xprt))
-		timer_setup(&xprt->timer,
+		timer_setup(&xprt->timer, xprt_init_autodisconnect, 0);
-				xprt_init_autodisconnect,
-				TIMER_DEFERRABLE);
 	else
 		timer_setup(&xprt->timer, NULL, 0);