rxrpc: Split out the call state changing functions into their own file

Split out the functions that change the state of an rxrpc call into their
own file.  The idea being to remove anything to do with changing the state
of a call directly from the rxrpc sendmsg() and recvmsg() paths and have
all that done in the I/O thread only, with the ultimate aim of removing the
state lock entirely.  Moving the code out of sendmsg.c and recvmsg.c makes
that easier to manage.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

4 files changed, 108 insertions, 89 deletions

diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
index e76d3459d78e..ac5caf5a48e1 100644
--- a/net/rxrpc/Makefile
+++ b/net/rxrpc/Makefile
@@ -10,6 +10,7 @@ rxrpc-y := \
 	call_accept.o \
 	call_event.o \
 	call_object.o \
+	call_state.o \
 	conn_client.o \
 	conn_event.o \
 	conn_object.o \
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 2740c6333114..203e0354d86b 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -886,6 +886,24 @@ static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 }
 
 /*
+ * call_state.c
+ */
+bool __rxrpc_set_call_completion(struct rxrpc_call *call,
+				 enum rxrpc_call_completion compl,
+				 u32 abort_code,
+				 int error);
+bool rxrpc_set_call_completion(struct rxrpc_call *call,
+			       enum rxrpc_call_completion compl,
+			       u32 abort_code,
+			       int error);
+bool __rxrpc_call_completed(struct rxrpc_call *call);
+bool rxrpc_call_completed(struct rxrpc_call *call);
+bool __rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
+			u32 abort_code, int error, enum rxrpc_abort_reason why);
+bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
+		      u32 abort_code, int error, enum rxrpc_abort_reason why);
+
+/*
  * conn_client.c
  */
 extern unsigned int rxrpc_reap_client_connections;
@@ -1116,14 +1134,6 @@ extern const struct seq_operations rxrpc_local_seq_ops;
  * recvmsg.c
  */
 void rxrpc_notify_socket(struct rxrpc_call *);
-bool __rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
-bool rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
-bool __rxrpc_call_completed(struct rxrpc_call *);
-bool rxrpc_call_completed(struct rxrpc_call *);
-bool __rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
-			u32 abort_code, int error, enum rxrpc_abort_reason why);
-bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
-		      u32 abort_code, int error, enum rxrpc_abort_reason why);
 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 
 /*
diff --git a/net/rxrpc/call_state.c b/net/rxrpc/call_state.c
new file mode 100644
index 000000000000..8fbb2112ed7e
--- /dev/null
+++ b/net/rxrpc/call_state.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Call state changing functions.
+ *
+ * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include "ar-internal.h"
+
+/*
+ * Transition a call to the complete state.
+ */
+bool __rxrpc_set_call_completion(struct rxrpc_call *call,
+				 enum rxrpc_call_completion compl,
+				 u32 abort_code,
+				 int error)
+{
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		call->abort_code = abort_code;
+		call->error = error;
+		call->completion = compl;
+		call->state = RXRPC_CALL_COMPLETE;
+		trace_rxrpc_call_complete(call);
+		wake_up(&call->waitq);
+		rxrpc_notify_socket(call);
+		return true;
+	}
+	return false;
+}
+
+bool rxrpc_set_call_completion(struct rxrpc_call *call,
+			       enum rxrpc_call_completion compl,
+			       u32 abort_code,
+			       int error)
+{
+	bool ret = false;
+
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		write_lock(&call->state_lock);
+		ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
+		write_unlock(&call->state_lock);
+	}
+	return ret;
+}
+
+/*
+ * Record that a call successfully completed.
+ */
+bool __rxrpc_call_completed(struct rxrpc_call *call)
+{
+	return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
+}
+
+bool rxrpc_call_completed(struct rxrpc_call *call)
+{
+	bool ret = false;
+
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		write_lock(&call->state_lock);
+		ret = __rxrpc_call_completed(call);
+		write_unlock(&call->state_lock);
+	}
+	return ret;
+}
+
+/*
+ * Record that a call is locally aborted.
+ */
+bool __rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
+			u32 abort_code, int error, enum rxrpc_abort_reason why)
+{
+	trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
+			  abort_code, error);
+	return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
+					   abort_code, error);
+}
+
+bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
+		      u32 abort_code, int error, enum rxrpc_abort_reason why)
+{
+	bool ret;
+
+	write_lock(&call->state_lock);
+	ret = __rxrpc_abort_call(call, seq, abort_code, error, why);
+	write_unlock(&call->state_lock);
+	if (ret && test_bit(RXRPC_CALL_EXPOSED, &call->flags))
+		rxrpc_send_abort_packet(call);
+	return ret;
+}
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 59b521b82aec..ff08f917ecda 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -59,87 +59,6 @@ void rxrpc_notify_socket(struct rxrpc_call *call)
 }
 
 /*
- * Transition a call to the complete state.
- */
-bool __rxrpc_set_call_completion(struct rxrpc_call *call,
-				 enum rxrpc_call_completion compl,
-				 u32 abort_code,
-				 int error)
-{
-	if (call->state < RXRPC_CALL_COMPLETE) {
-		call->abort_code = abort_code;
-		call->error = error;
-		call->completion = compl;
-		call->state = RXRPC_CALL_COMPLETE;
-		trace_rxrpc_call_complete(call);
-		wake_up(&call->waitq);
-		rxrpc_notify_socket(call);
-		return true;
-	}
-	return false;
-}
-
-bool rxrpc_set_call_completion(struct rxrpc_call *call,
-			       enum rxrpc_call_completion compl,
-			       u32 abort_code,
-			       int error)
-{
-	bool ret = false;
-
-	if (call->state < RXRPC_CALL_COMPLETE) {
-		write_lock(&call->state_lock);
-		ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
-		write_unlock(&call->state_lock);
-	}
-	return ret;
-}
-
-/*
- * Record that a call successfully completed.
- */
-bool __rxrpc_call_completed(struct rxrpc_call *call)
-{
-	return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
-}
-
-bool rxrpc_call_completed(struct rxrpc_call *call)
-{
-	bool ret = false;
-
-	if (call->state < RXRPC_CALL_COMPLETE) {
-		write_lock(&call->state_lock);
-		ret = __rxrpc_call_completed(call);
-		write_unlock(&call->state_lock);
-	}
-	return ret;
-}
-
-/*
- * Record that a call is locally aborted.
- */
-bool __rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
-			u32 abort_code, int error, enum rxrpc_abort_reason why)
-{
-	trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
-			  abort_code, error);
-	return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
-					   abort_code, error);
-}
-
-bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
-		      u32 abort_code, int error, enum rxrpc_abort_reason why)
-{
-	bool ret;
-
-	write_lock(&call->state_lock);
-	ret = __rxrpc_abort_call(call, seq, abort_code, error, why);
-	write_unlock(&call->state_lock);
-	if (ret && test_bit(RXRPC_CALL_EXPOSED, &call->flags))
-		rxrpc_send_abort_packet(call);
-	return ret;
-}
-
-/*
  * Pass a call terminating message to userspace.
  */
 static int rxrpc_recvmsg_term(struct rxrpc_call *call, struct msghdr *msg)