netfs: Split some core bits out into their own file

Split some core bits out into their own file.  More bits will be added to
this file later.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com

Link: https://lore.kernel.org/r/164623006934.3564931.17932680017894039748.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/164678218407.1200972.1731208226140990280.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/164692920944.2099075.11990502173226013856.stgit@warthog.procyon.org.uk/ # v3

Author: dhowells

fs/netfs/Makefile

@@ -3,6 +3,7 @@
 netfs-y := \
 	buffered_read.o \
 	io.o \
+	main.o \
 	objects.o
 
 netfs-$(CONFIG_NETFS_STATS) += stats.o

fs/netfs/internal.h

@@ -23,10 +23,13 @@ void netfs_rreq_unlock_folios(struct netfs_io_request *rreq);
 /*
  * io.c
  */
-extern unsigned int netfs_debug;
-
 int netfs_begin_read(struct netfs_io_request *rreq, bool sync);
 
+/*
+ * main.c
+ */
+extern unsigned int netfs_debug;
+
 /*
  * objects.c
  */

fs/netfs/io.c

@@ -15,16 +15,6 @@
 #include <linux/sched/mm.h>
 #include <linux/task_io_accounting_ops.h>
 #include "internal.h"
-#define CREATE_TRACE_POINTS
-#include <trace/events/netfs.h>
-
-MODULE_DESCRIPTION("Network fs support");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-
-unsigned netfs_debug;
-module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask");
 
 /*
  * Clear the unread part of an I/O request.

fs/netfs/main.c

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Miscellaneous bits for the netfs support library.
+ *
+ * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/export.h>
+#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/netfs.h>
+
+MODULE_DESCRIPTION("Network fs support");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+unsigned netfs_debug;
+module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask");