afs: Potentially return call->reply[0] from afs_make_call()

If call->ret_reply0 is set, return call->reply[0] on success.  Change the
return type of afs_make_call() to long so that this can be passed back
without bit loss and then cast to a pointer if required.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/internal.h

@@ -101,6 +101,7 @@ struct afs_call {
 	bool			send_pages;	/* T if data from mapping should be sent */
 	bool			need_attention;	/* T if RxRPC poked us */
 	bool			async;		/* T if asynchronous */
+	bool			ret_reply0;	/* T if should return reply[0] on success */
 	bool			upgrade;	/* T to request service upgrade */
 	u16			service_id;	/* RxRPC service ID to call */
 	u32			operation_ID;	/* operation ID for an incoming call */
@@ -647,7 +648,7 @@ extern void __net_exit afs_close_socket(struct afs_net *);
 extern void afs_charge_preallocation(struct work_struct *);
 extern void afs_put_call(struct afs_call *);
 extern int afs_queue_call_work(struct afs_call *);
-extern int afs_make_call(struct sockaddr_rxrpc *, struct afs_call *, gfp_t, bool);
+extern long afs_make_call(struct sockaddr_rxrpc *, struct afs_call *, gfp_t, bool);
 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
 					    const struct afs_call_type *,
 					    size_t, size_t);

fs/afs/rxrpc.c

@@ -20,7 +20,7 @@
 struct workqueue_struct *afs_async_calls;
 
 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
-static int afs_wait_for_call_to_complete(struct afs_call *);
+static long afs_wait_for_call_to_complete(struct afs_call *);
 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
 static void afs_process_async_call(struct work_struct *);
 static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
@@ -320,8 +320,8 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
 /*
  * initiate a call
  */
-int afs_make_call(struct sockaddr_rxrpc *srx, struct afs_call *call,
-		  gfp_t gfp, bool async)
+long afs_make_call(struct sockaddr_rxrpc *srx, struct afs_call *call,
+		   gfp_t gfp, bool async)
 {
 	struct rxrpc_call *rxcall;
 	struct msghdr msg;
@@ -415,9 +415,9 @@ int afs_make_call(struct sockaddr_rxrpc *srx, struct afs_call *call,
 		abort_code = 0;
 		offset = 0;
 		rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL,
-				       0, &offset, false, &abort_code,
+				       0, &offset, false, &call->abort_code,
 				       &call->service_id);
-		ret = afs_abort_to_error(abort_code);
+		ret = afs_abort_to_error(call->abort_code);
 	}
 error_kill_call:
 	afs_put_call(call);
@@ -468,7 +468,7 @@ static void afs_deliver_to_call(struct afs_call *call)
 		case -EAGAIN:
 			goto out;
 		case -ECONNABORTED:
-			goto call_complete;
+			goto save_error;
 		case -ENOTCONN:
 			abort_code = RX_CALL_DEAD;
 			rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
@@ -501,7 +501,6 @@ static void afs_deliver_to_call(struct afs_call *call)
 
 save_error:
 	call->error = ret;
-call_complete:
 	call->state = AFS_CALL_COMPLETE;
 	goto done;
 }
@@ -509,10 +508,10 @@ static void afs_deliver_to_call(struct afs_call *call)
 /*
  * wait synchronously for a call to complete
  */
-static int afs_wait_for_call_to_complete(struct afs_call *call)
+static long afs_wait_for_call_to_complete(struct afs_call *call)
 {
 	signed long rtt2, timeout;
-	int ret;
+	long ret;
 	u64 rtt;
 	u32 life, last_life;
 
@@ -567,9 +566,16 @@ static int afs_wait_for_call_to_complete(struct afs_call *call)
 	}
 
 	ret = call->error;
+	if (ret < 0) {
+		ret = afs_abort_to_error(call->abort_code);
+	} else if (ret == 0 && call->ret_reply0) {
+		ret = (long)call->reply[0];
+		call->reply[0] = NULL;
+	}
+
 	_debug("call complete");
 	afs_put_call(call);
-	_leave(" = %d", ret);
+	_leave(" = %p", (void *)ret);
 	return ret;
 }