first version of dnbd3-ng

1 files changed, 86 insertions, 0 deletions

diff --git a/src/kernel/dnbd3.h b/src/kernel/dnbd3.h
new file mode 100644
index 0000000..2575cd8
--- /dev/null
+++ b/src/kernel/dnbd3.h
@@ -0,0 +1,86 @@
+/*
+ * This file is part of the Distributed Network Block Device 3
+ *
+ * Copyright(c) 2019 Frederic Robra <frederic@robra.org>
+ * Parts copyright 2011-2012 Johann Latocha <johann@latocha.de>
+ *
+ * This file may be licensed under the terms of of the
+ * GNU General Public License Version 2 (the ``GPL'').
+ *
+ * Software distributed under the License is distributed
+ * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+ * express or implied. See the GPL for the specific language
+ * governing rights and limitations.
+ *
+ * You should have received a copy of the GPL along with this
+ * program. If not, go to http://www.gnu.org/licenses/gpl.html
+ * or write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+#ifndef DNBD_H_
+#define DNBD_H_
+
+#include <linux/blk-mq.h>
+#include <linux/types.h>
+#include <linux/refcount.h>
+#include <linux/blkdev.h>
+
+#define KERNEL_MODULE
+#include "types.h"
+
+typedef struct
+{
+	dnbd3_host_t host;
+	uint64_t rtts[4];		// Last four round trip time measurements in microsecond
+	uint16_t protocol_version;	// dnbd3 protocol version of this server
+	uint8_t failures;			// How many times the server was unreachable
+} dnbd3_server_t;
+
+
+typedef struct dnbd3_device_t {
+	int minor;
+	struct blk_mq_tag_set tag_set;
+	struct request_queue queue;
+	struct mutex config_lock;
+	refcount_t config_refs;
+	refcount_t refs;
+	struct list_head list;
+
+	// block
+	struct gendisk *disk;
+
+	// sysfs
+	struct kobject kobj;
+
+	// network
+	char *imgname;
+	struct socket *sock;
+	dnbd3_server_t cur_server, initial_server;
+	unsigned long cur_rtt;
+//	serialized_buffer_t payload_buffer;
+	dnbd3_server_t alt_servers[NUMBER_SERVERS]; // array of alt servers
+	int new_servers_num;	// number of new alt servers that are waiting to be copied to above array
+	dnbd3_server_entry_t new_servers[NUMBER_SERVERS]; // pending new alt servers
+	uint8_t discover, panic, disconnecting, update_available, panic_count;
+	uint8_t use_server_provided_alts;
+	uint16_t rid;
+	uint32_t heartbeat_count;
+	uint64_t reported_size;
+	// server switch
+	struct socket *better_sock;
+
+} dnbd3_device_t;
+
+
+typedef struct dnbd3_cmd {
+	struct dnbd3_device_t *dnbd3;
+	struct mutex lock;
+	int index;
+	int cookie;
+	blk_status_t status;
+	unsigned long flags;
+	u32 cmd_cookie;
+} dnbd3_cmd;
+
+#endif /* DNBD_H_ */