From: Thomas Schoebel-Theuer <tst@schoebel-theuer.de>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 43/50] mars: add new file drivers/block/mars/xio_bricks/xio_server.c
Date: Tue,  1 Jul 2014 23:47:23 +0200
Message-Id: <1404251250-22992-44-git-send-email-tst@schoebel-theuer.de>
In-Reply-To: <1404251250-22992-1-git-send-email-tst@schoebel-theuer.de>
References: <1404251250-22992-1-git-send-email-tst@schoebel-theuer.de>
Sender: linux-kernel-owner@vger.kernel.org

Signed-off-by: Thomas Schoebel-Theuer <tst@schoebel-theuer.de>
---
 drivers/block/mars/xio_bricks/xio_server.c | 801 +++++++++++++++++++++++++++++
 1 file changed, 801 insertions(+)
 create mode 100644 drivers/block/mars/xio_bricks/xio_server.c

diff --git a/drivers/block/mars/xio_bricks/xio_server.c b/drivers/block/mars/xio_bricks/xio_server.c
new file mode 100644
index 0000000..0b87f9f
--- /dev/null
+++ b/drivers/block/mars/xio_bricks/xio_server.c
@@ -0,0 +1,801 @@
+/*  (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG */
+
+/*  Server brick (just for demonstration) */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#define _STRATEGY
+#include <linux/brick/brick.h>
+#include <linux/xio.h>
+#include <linux/xio/xio_bio.h>
+#include <linux/xio/xio_aio.h>
+
+#include <linux/mars_light/light_strategy.h>
+
+/************************ own type definitions ***********************/
+
+#include <linux/xio/xio_server.h>
+
+#define NR_SOCKETS			3
+
+static struct xio_socket server_socket[NR_SOCKETS];
+static struct task_struct *server_thread[NR_SOCKETS];
+
+/************************ own helper functions ***********************/
+
+static
+int cb_thread(void *data)
+{
+	struct server_brick *brick = data;
+	struct xio_socket *sock = &brick->handler_socket;
+	bool aborted = false;
+	bool ok = xio_get_socket(sock);
+	int status = -EINVAL;
+
+	XIO_DBG("--------------- cb_thread starting on socket #%d, ok = %d\n", sock->s_debug_nr, ok);
+	if (!ok)
+		goto done;
+
+	brick->cb_running = true;
+	wake_up_interruptible(&brick->startup_event);
+
+	while (!brick_thread_should_stop() || !list_empty(&brick->cb_read_list) || !list_empty(&brick->cb_write_list) || atomic_read(&brick->in_flight) > 0) {
+		struct server_aio_aspect *aio_a;
+		struct aio_object *aio;
+		struct list_head *tmp;
+
+		wait_event_interruptible_timeout(
+			brick->cb_event,
+			!list_empty(&brick->cb_read_list) ||
+			!list_empty(&brick->cb_write_list),
+			1 * HZ);
+
+		spin_lock(&brick->cb_lock);
+		tmp = brick->cb_write_list.next;
+		if (tmp == &brick->cb_write_list) {
+			tmp = brick->cb_read_list.next;
+			if (tmp == &brick->cb_read_list) {
+				spin_unlock(&brick->cb_lock);
+				brick_msleep(1000 / HZ);
+				continue;
+			}
+		}
+		list_del_init(tmp);
+		spin_unlock(&brick->cb_lock);
+
+		aio_a = container_of(tmp, struct server_aio_aspect, cb_head);
+		aio = aio_a->object;
+		status = -EINVAL;
+		CHECK_PTR(aio, err);
+
+		status = 0;
+		if (!aborted) {
+			down(&brick->socket_sem);
+			status = xio_send_cb(sock, aio);
+			up(&brick->socket_sem);
+		}
+
+err:
+		if (unlikely(status < 0) && !aborted) {
+			aborted = true;
+			XIO_WRN("cannot send response, status = %d\n", status);
+			/* Just shutdown the socket and forget all pending
+			 * requests.
+			 * The _client_ is responsible for resending
+			 * any lost operations.
+			 */
+			xio_shutdown_socket(sock);
+		}
+
+		if (aio_a->do_put) {
+			GENERIC_INPUT_CALL(brick->inputs[0], aio_put, aio);
+			atomic_dec(&brick->in_flight);
+		} else {
+			obj_free(aio);
+		}
+	}
+
+	xio_shutdown_socket(sock);
+	xio_put_socket(sock);
+
+done:
+	XIO_DBG("---------- cb_thread terminating, status = %d\n", status);
+	wake_up_interruptible(&brick->startup_event);
+	return status;
+}
+
+static
+void server_endio(struct generic_callback *cb)
+{
+	struct server_aio_aspect *aio_a;
+	struct aio_object *aio;
+	struct server_brick *brick;
+	int rw;
+
+	aio_a = cb->cb_private;
+	CHECK_PTR(aio_a, err);
+	aio = aio_a->object;
+	CHECK_PTR(aio, err);
+	LAST_CALLBACK(cb);
+	if (unlikely(cb != &aio->_object_cb))
+		XIO_ERR("bad cb pointer %p != %p\n", cb, &aio->_object_cb);
+
+	brick = aio_a->brick;
+	if (unlikely(!brick)) {
+		XIO_WRN("late IO callback -- cannot do anything\n");
+		goto out_return;
+	}
+
+	rw = aio->io_rw;
+
+	spin_lock(&brick->cb_lock);
+	if (rw)
+		list_add_tail(&aio_a->cb_head, &brick->cb_write_list);
+	else
+		list_add_tail(&aio_a->cb_head, &brick->cb_read_list);
+	spin_unlock(&brick->cb_lock);
+
+	wake_up_interruptible(&brick->cb_event);
+	goto out_return;
+err:
+	XIO_FAT("cannot handle callback - giving up\n");
+out_return:;
+}
+
+static
+int server_io(struct server_brick *brick, struct xio_socket *sock, struct xio_cmd *cmd)
+{
+	struct aio_object *aio;
+	struct server_aio_aspect *aio_a;
+	int amount;
+	int status = -ENOTRECOVERABLE;
+
+	if (!brick->cb_running || !brick->handler_running || !xio_socket_is_alive(sock))
+		goto done;
+
+	aio = server_alloc_aio(brick);
+	status = -ENOMEM;
+	aio_a = server_aio_get_aspect(brick, aio);
+	if (unlikely(!aio_a)) {
+		obj_free(aio);
+		goto done;
+	}
+
+	status = xio_recv_aio(sock, aio, cmd);
+	if (status < 0) {
+		obj_free(aio);
+		goto done;
+	}
+
+	aio_a->brick = brick;
+	SETUP_CALLBACK(aio, server_endio, aio_a);
+
+	amount = 0;
+	if (!aio->io_cs_mode < 2)
+		amount = (aio->io_len - 1) / 1024 + 1;
+	xio_limit_sleep(&server_limiter, amount);
+
+	status = GENERIC_INPUT_CALL(brick->inputs[0], aio_get, aio);
+	if (unlikely(status < 0)) {
+		XIO_WRN("aio_get execution error = %d\n", status);
+		SIMPLE_CALLBACK(aio, status);
+		status = 0; /*	continue serving requests */
+		goto done;
+	}
+	aio_a->do_put = true;
+	atomic_inc(&brick->in_flight);
+	GENERIC_INPUT_CALL(brick->inputs[0], aio_io, aio);
+
+done:
+	return status;
+}
+
+static
+int _set_server_aio_params(struct xio_brick *_brick, void *private)
+{
+	struct aio_brick *aio_brick = (void *)_brick;
+
+	if (_brick->type != (void *)_aio_brick_type) {
+		XIO_ERR("bad brick type\n");
+		return -EINVAL;
+	}
+	aio_brick->o_creat = false;
+	aio_brick->o_direct = false;
+	aio_brick->o_fdsync = false;
+	XIO_INF("name = '%s' path = '%s'\n", _brick->brick_name, _brick->brick_path);
+	return 1;
+}
+
+static
+int _set_server_bio_params(struct xio_brick *_brick, void *private)
+{
+	struct bio_brick *bio_brick;
+
+	if (_brick->type == (void *)_aio_brick_type)
+		return _set_server_aio_params(_brick, private);
+	if (_brick->type != (void *)_bio_brick_type) {
+		XIO_ERR("bad brick type\n");
+		return -EINVAL;
+	}
+	bio_brick = (void *)_brick;
+	bio_brick->ra_pages = 0;
+	bio_brick->do_noidle = true;
+	bio_brick->do_sync = true;
+	bio_brick->do_unplug = true;
+	XIO_INF("name = '%s' path = '%s'\n", _brick->brick_name, _brick->brick_path);
+	return 1;
+}
+
+static
+int dummy_worker(struct mars_global *global, struct mars_dent *dent, bool prepare, bool direction)
+{
+	return 0;
+}
+
+static
+int handler_thread(void *data)
+{
+	struct server_brick *brick = data;
+	struct xio_socket *sock = &brick->handler_socket;
+	bool ok = xio_get_socket(sock);
+	int debug_nr;
+	int status = -EINVAL;
+
+	XIO_DBG("#%d --------------- handler_thread starting on socket %p\n", sock->s_debug_nr, sock);
+	if (!ok)
+		goto done;
+
+	brick->handler_running = true;
+	wake_up_interruptible(&brick->startup_event);
+
+	while (!brick_thread_should_stop() && xio_socket_is_alive(sock)) {
+		struct xio_cmd cmd = {};
+
+		status = -EINTR;
+		if (unlikely(!mars_global || !mars_global->global_power.button)) {
+			XIO_DBG("system is not alive\n");
+			break;
+		}
+
+		status = xio_recv_struct(sock, &cmd, xio_cmd_meta);
+		if (unlikely(status < 0)) {
+			XIO_WRN("#%d recv cmd status = %d\n", sock->s_debug_nr, status);
+			goto clean;
+		}
+		if (unlikely(!xio_socket_is_alive(sock))) {
+			XIO_WRN("#%d is dead\n", sock->s_debug_nr);
+			status = -EINTR;
+			goto clean;
+		}
+
+		status = -EPROTO;
+		switch (cmd.cmd_code & CMD_FLAG_MASK) {
+		case CMD_NOP:
+			status = 0;
+			XIO_DBG("#%d got NOP operation\n", sock->s_debug_nr);
+			break;
+		case CMD_NOTIFY:
+			status = 0;
+			from_remote_trigger();
+			break;
+		case CMD_GETINFO:
+		{
+			struct xio_info info = {};
+
+			status = GENERIC_INPUT_CALL(brick->inputs[0], xio_get_info, &info);
+			if (status < 0)
+				break;
+			down(&brick->socket_sem);
+			status = xio_send_struct(sock, &cmd, xio_cmd_meta);
+			if (status >= 0)
+				status = xio_send_struct(sock, &info, xio_info_meta);
+			up(&brick->socket_sem);
+			break;
+		}
+		case CMD_GETENTS:
+		{
+			struct mars_global local = {
+				.dent_anchor = LIST_HEAD_INIT(local.dent_anchor),
+				.brick_anchor = LIST_HEAD_INIT(local.brick_anchor),
+				.global_power = {
+					.button = true,
+				},
+				.main_event = __WAIT_QUEUE_HEAD_INITIALIZER(local.main_event),
+			};
+
+			status = -EINVAL;
+			if (unlikely(!cmd.cmd_str1))
+				break;
+
+			init_rwsem(&local.dent_mutex);
+			init_rwsem(&local.brick_mutex);
+
+			status = mars_dent_work(&local,
+				"/mars",
+				sizeof(struct mars_dent),
+				external_checker,
+				dummy_worker,
+				&local,
+				3);
+
+			down(&brick->socket_sem);
+			status = xio_send_dent_list(sock, &local.dent_anchor);
+			up(&brick->socket_sem);
+
+			if (status < 0) {
+				XIO_WRN("#%d could not send dentry information, status = %d\n",
+					sock->s_debug_nr,
+					status);
+			}
+
+			xio_free_dent_all(&local, &local.dent_anchor);
+			break;
+		}
+		case CMD_CONNECT:
+		{
+			struct xio_brick *prev;
+			const char *path = cmd.cmd_str1;
+
+			status = -EINVAL;
+			CHECK_PTR(path, err);
+			CHECK_PTR_NULL(_bio_brick_type, err);
+
+			if (!brick->global || !mars_global || !mars_global->global_power.button) {
+				XIO_WRN("#%d system is not alive\n", sock->s_debug_nr);
+				goto err;
+			}
+
+			prev = make_brick_all(
+				brick->global,
+				NULL,
+				_set_server_bio_params,
+				NULL,
+				path,
+				(const struct generic_brick_type *)_bio_brick_type,
+				(const struct generic_brick_type *[]){},
+				2, /*  start always */
+				path,
+				(const char *[]){},
+				0);
+			if (likely(prev)) {
+				status = generic_connect((void *)brick->inputs[0], (void *)prev->outputs[0]);
+				if (unlikely(status < 0))
+					XIO_ERR("#%d cannot connect to '%s'\n", sock->s_debug_nr, path);
+				prev->killme = true;
+			} else {
+				XIO_ERR("#%d cannot find brick '%s'\n", sock->s_debug_nr, path);
+			}
+
+err:
+			cmd.cmd_int1 = status;
+			down(&brick->socket_sem);
+			status = xio_send_struct(sock, &cmd, xio_cmd_meta);
+			up(&brick->socket_sem);
+			break;
+		}
+		case CMD_AIO:
+		{
+			status = server_io(brick, sock, &cmd);
+			break;
+		}
+		case CMD_CB:
+			XIO_ERR("#%d oops, as a server I should never get CMD_CB; something is wrong here - attack attempt??\n",
+				sock->s_debug_nr);
+			break;
+		default:
+			XIO_ERR("#%d unknown command %d\n", sock->s_debug_nr, cmd.cmd_code);
+		}
+clean:
+		brick_string_free(cmd.cmd_str1);
+		if (status < 0)
+			break;
+	}
+
+	xio_shutdown_socket(sock);
+	xio_put_socket(sock);
+
+done:
+	XIO_DBG("#%d handler_thread terminating, status = %d\n", sock->s_debug_nr, status);
+
+	debug_nr = sock->s_debug_nr;
+
+	XIO_DBG("#%d done.\n", debug_nr);
+	brick->killme = true;
+	return status;
+}
+
+/***************** own brick * input * output operations *****************/
+
+static int server_get_info(struct server_output *output, struct xio_info *info)
+{
+	struct server_input *input = output->brick->inputs[0];
+
+	return GENERIC_INPUT_CALL(input, xio_get_info, info);
+}
+
+static int server_io_get(struct server_output *output, struct aio_object *aio)
+{
+	struct server_input *input = output->brick->inputs[0];
+
+	return GENERIC_INPUT_CALL(input, aio_get, aio);
+}
+
+static void server_io_put(struct server_output *output, struct aio_object *aio)
+{
+	struct server_input *input = output->brick->inputs[0];
+
+	GENERIC_INPUT_CALL(input, aio_put, aio);
+}
+
+static void server_io_io(struct server_output *output, struct aio_object *aio)
+{
+	struct server_input *input = output->brick->inputs[0];
+
+	GENERIC_INPUT_CALL(input, aio_io, aio);
+}
+
+static int server_switch(struct server_brick *brick)
+{
+	struct xio_socket *sock = &brick->handler_socket;
+	int status = 0;
+
+	if (brick->power.button) {
+		static int version;
+		bool ok;
+
+		if (brick->power.on_led)
+			goto done;
+
+		ok = xio_get_socket(sock);
+		if (unlikely(!ok)) {
+			status = -ENOENT;
+			goto err;
+		}
+
+		xio_set_power_off_led((void *)brick, false);
+
+		brick->cb_thread = brick_thread_create(cb_thread, brick, "xio_cb%d", version);
+		if (unlikely(!brick->cb_thread)) {
+			XIO_ERR("cannot create cb thread\n");
+			status = -ENOENT;
+			goto err;
+		}
+
+		brick->handler_thread = brick_thread_create(handler_thread, brick, "xio_handler%d", version++);
+		if (unlikely(!brick->handler_thread)) {
+			XIO_ERR("cannot create handler thread\n");
+			brick_thread_stop(brick->cb_thread);
+			brick->cb_thread = NULL;
+			status = -ENOENT;
+			goto err;
+		}
+
+		xio_set_power_on_led((void *)brick, true);
+	} else if (!brick->power.off_led) {
+		struct task_struct *thread;
+
+		xio_set_power_on_led((void *)brick, false);
+
+		xio_shutdown_socket(sock);
+
+		thread = brick->handler_thread;
+		if (thread) {
+			brick->handler_thread = NULL;
+			brick->handler_running = false;
+			XIO_DBG("#%d stopping handler thread....\n", sock->s_debug_nr);
+			brick_thread_stop(thread);
+		}
+		thread = brick->cb_thread;
+		if (thread) {
+			brick->cb_thread = NULL;
+			brick->cb_running = false;
+			XIO_DBG("#%d stopping callback thread....\n", sock->s_debug_nr);
+			brick_thread_stop(thread);
+		}
+
+		xio_put_socket(sock);
+		XIO_DBG("#%d socket s_count = %d\n", sock->s_debug_nr, atomic_read(&sock->s_count));
+
+		xio_set_power_off_led((void *)brick, true);
+	}
+err:
+	if (unlikely(status < 0)) {
+		xio_set_power_off_led((void *)brick, true);
+		xio_shutdown_socket(sock);
+		xio_put_socket(sock);
+	}
+done:
+	return status;
+}
+
+/*************** informational * statistics **************/
+
+static
+char *server_statistics(struct server_brick *brick, int verbose)
+{
+	char *res = brick_string_alloc(1024);
+
+	snprintf(res, 1024,
+		 "cb_running = %d handler_running = %d in_flight = %d\n",
+		 brick->cb_running,
+		 brick->handler_running,
+		 atomic_read(&brick->in_flight));
+
+	return res;
+}
+
+static
+void server_reset_statistics(struct server_brick *brick)
+{
+}
+
+/*************** object * aspect constructors * destructors **************/
+
+static int server_aio_aspect_init_fn(struct generic_aspect *_ini)
+{
+	struct server_aio_aspect *ini = (void *)_ini;
+
+	INIT_LIST_HEAD(&ini->cb_head);
+	return 0;
+}
+
+static void server_aio_aspect_exit_fn(struct generic_aspect *_ini)
+{
+	struct server_aio_aspect *ini = (void *)_ini;
+
+	CHECK_HEAD_EMPTY(&ini->cb_head);
+}
+
+XIO_MAKE_STATICS(server);
+
+/********************* brick constructors * destructors *******************/
+
+static int server_brick_construct(struct server_brick *brick)
+{
+	init_waitqueue_head(&brick->startup_event);
+	init_waitqueue_head(&brick->cb_event);
+	sema_init(&brick->socket_sem, 1);
+	spin_lock_init(&brick->cb_lock);
+	INIT_LIST_HEAD(&brick->cb_read_list);
+	INIT_LIST_HEAD(&brick->cb_write_list);
+	return 0;
+}
+
+static int server_brick_destruct(struct server_brick *brick)
+{
+	CHECK_HEAD_EMPTY(&brick->cb_read_list);
+	CHECK_HEAD_EMPTY(&brick->cb_write_list);
+	return 0;
+}
+
+static int server_output_construct(struct server_output *output)
+{
+	return 0;
+}
+
+/************************ static structs ***********************/
+
+static struct server_brick_ops server_brick_ops = {
+	.brick_switch = server_switch,
+	.brick_statistics = server_statistics,
+	.reset_statistics = server_reset_statistics,
+};
+
+static struct server_output_ops server_output_ops = {
+	.xio_get_info = server_get_info,
+	.aio_get = server_io_get,
+	.aio_put = server_io_put,
+	.aio_io = server_io_io,
+};
+
+const struct server_input_type server_input_type = {
+	.type_name = "server_input",
+	.input_size = sizeof(struct server_input),
+};
+
+static const struct server_input_type *server_input_types[] = {
+	&server_input_type,
+};
+
+const struct server_output_type server_output_type = {
+	.type_name = "server_output",
+	.output_size = sizeof(struct server_output),
+	.master_ops = &server_output_ops,
+	.output_construct = &server_output_construct,
+};
+
+static const struct server_output_type *server_output_types[] = {
+	&server_output_type,
+};
+
+const struct server_brick_type server_brick_type = {
+	.type_name = "server_brick",
+	.brick_size = sizeof(struct server_brick),
+	.max_inputs = 1,
+	.max_outputs = 0,
+	.master_ops = &server_brick_ops,
+	.aspect_types = server_aspect_types,
+	.default_input_types = server_input_types,
+	.default_output_types = server_output_types,
+	.brick_construct = &server_brick_construct,
+	.brick_destruct = &server_brick_destruct,
+};
+EXPORT_SYMBOL_GPL(server_brick_type);
+
+/*********************************************************************/
+
+/*  strategy layer */
+
+int server_show_statist = 0;
+EXPORT_SYMBOL_GPL(server_show_statist);
+
+static int _server_thread(void *data)
+{
+	struct mars_global server_global = {
+		.dent_anchor = LIST_HEAD_INIT(server_global.dent_anchor),
+		.brick_anchor = LIST_HEAD_INIT(server_global.brick_anchor),
+		.global_power = {
+			.button = true,
+		},
+		.main_event = __WAIT_QUEUE_HEAD_INITIALIZER(server_global.main_event),
+	};
+	struct xio_socket *my_socket = data;
+	char *id = my_id();
+	int status = 0;
+
+	init_rwsem(&server_global.dent_mutex);
+	init_rwsem(&server_global.brick_mutex);
+
+	XIO_INF("-------- server starting on host '%s' ----------\n", id);
+
+	while (!brick_thread_should_stop() &&
+	      (!mars_global || !mars_global->global_power.button)) {
+		XIO_DBG("system did not start up\n");
+		brick_msleep(5000);
+	}
+
+	XIO_INF("-------- server now working on host '%s' ----------\n", id);
+
+	while (!brick_thread_should_stop() || !list_empty(&server_global.brick_anchor)) {
+		struct server_brick *brick = NULL;
+		struct xio_socket handler_socket = {};
+
+		server_global.global_version++;
+
+		if (server_show_statist)
+			show_statistics(&server_global, "server");
+
+		status = xio_kill_brick_when_possible(&server_global, &server_global.brick_anchor, false, NULL, true);
+		XIO_DBG("kill server bricks (when possible) = %d\n", status);
+
+		if (!mars_global || !mars_global->global_power.button) {
+			brick_msleep(1000);
+			continue;
+		}
+
+		status = xio_accept_socket(&handler_socket, my_socket);
+		if (unlikely(status < 0 || !xio_socket_is_alive(&handler_socket))) {
+			brick_msleep(500);
+			if (status == -EAGAIN)
+				continue; /*  without error message */
+			XIO_WRN("accept status = %d\n", status);
+			brick_msleep(1000);
+			continue;
+		}
+		handler_socket.s_shutdown_on_err = true;
+
+		XIO_DBG("got new connection #%d\n", handler_socket.s_debug_nr);
+
+		brick = (void *)xio_make_brick(&server_global, NULL, &server_brick_type, "handler", "handler");
+		if (!brick) {
+			XIO_ERR("cannot create server instance\n");
+			xio_shutdown_socket(&handler_socket);
+			xio_put_socket(&handler_socket);
+			brick_msleep(2000);
+			continue;
+		}
+		memcpy(&brick->handler_socket, &handler_socket, sizeof(struct xio_socket));
+
+		/* TODO: check authorization.
+		 */
+
+		brick->power.button = true;
+		status = server_switch(brick);
+		if (unlikely(status < 0)) {
+			XIO_ERR("cannot switch on server brick, status = %d\n", status);
+			goto err;
+		}
+
+		/*  further references are usually held by the threads */
+		xio_put_socket(&brick->handler_socket);
+
+		/* fire and forget....
+		 * the new instance is now responsible for itself.
+		 */
+		brick = NULL;
+		brick_msleep(100);
+		continue;
+
+err:
+		if (brick) {
+			xio_shutdown_socket(&brick->handler_socket);
+			xio_put_socket(&brick->handler_socket);
+			status = xio_kill_brick((void *)brick);
+			if (status < 0)
+				BRICK_ERR("kill status = %d, giving up\n", status);
+			brick = NULL;
+		}
+		brick_msleep(2000);
+	}
+
+	XIO_INF("-------- cleaning up ----------\n");
+
+	xio_kill_brick_all(&server_global, &server_global.brick_anchor, false);
+
+	/* cleanup_mm(); */
+
+	XIO_INF("-------- done status = %d ----------\n", status);
+	return status;
+}
+
+/***************** module init stuff ************************/
+
+struct xio_limiter server_limiter = {
+	.lim_max_rate = 0,
+};
+EXPORT_SYMBOL_GPL(server_limiter);
+
+void exit_xio_server(void)
+{
+	int i;
+
+	XIO_INF("exit_server()\n");
+	server_unregister_brick_type();
+
+	for (i = 0; i < NR_SOCKETS; i++) {
+		if (server_thread[i]) {
+			XIO_INF("stopping server thread %d...\n", i);
+			brick_thread_stop(server_thread[i]);
+		}
+		XIO_INF("closing server socket %d...\n", i);
+		xio_put_socket(&server_socket[i]);
+	}
+}
+
+int __init init_xio_server(void)
+{
+	int i;
+
+	XIO_INF("init_server()\n");
+
+	for (i = 0; i < NR_SOCKETS; i++) {
+		struct sockaddr_storage sockaddr = {};
+		char tmp[16];
+		int status;
+
+		sprintf(tmp, ":%d", xio_net_default_port + i);
+		status = xio_create_sockaddr(&sockaddr, tmp);
+		if (unlikely(status < 0)) {
+			exit_xio_server();
+			return status;
+		}
+
+		status = xio_create_socket(&server_socket[i], &sockaddr, true);
+		if (unlikely(status < 0)) {
+			XIO_ERR("could not create server socket %d, status = %d\n", i, status);
+			exit_xio_server();
+			return status;
+		}
+
+		server_thread[i] = brick_thread_create(_server_thread, &server_socket[i], "xio_server_%d", i);
+		if (unlikely(!server_thread[i] || IS_ERR(server_thread[i]))) {
+			XIO_ERR("could not create server thread %d\n", i);
+			exit_xio_server();
+			return -ENOENT;
+		}
+	}
+
+	return server_register_brick_type();
+}
-- 
2.0.0

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