block/rnbd: server: private header with server structs and functions

This header describes main structs and functions used by rnbd-server
module, namely structs for managing sessions from different clients and
mapped (opened) devices.

Link: https://lore.kernel.org/r/20200511135131.27580-20-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/block/rnbd/rnbd-srv.h b/drivers/block/rnbd/rnbd-srv.h
new file mode 100644 (file)
index 0000000..5a8544b
--- /dev/null
+++ b/drivers/block/rnbd/rnbd-srv.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Network Block Driver
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#ifndef RNBD_SRV_H
+#define RNBD_SRV_H
+
+#include <linux/types.h>
+#include <linux/idr.h>
+#include <linux/kref.h>
+
+#include <rtrs.h>
+#include "rnbd-proto.h"
+#include "rnbd-log.h"
+
+struct rnbd_srv_session {
+       /* Entry inside global sess_list */
+       struct list_head        list;
+       struct rtrs_srv         *rtrs;
+       char                    sessname[NAME_MAX];
+       int                     queue_depth;
+       struct bio_set          sess_bio_set;
+
+       struct xarray           index_idr;
+       /* List of struct rnbd_srv_sess_dev */
+       struct list_head        sess_dev_list;
+       struct mutex            lock;
+       u8                      ver;
+};
+
+struct rnbd_srv_dev {
+       /* Entry inside global dev_list */
+       struct list_head                list;
+       struct kobject                  dev_kobj;
+       struct kobject                  *dev_sessions_kobj;
+       struct kref                     kref;
+       char                            id[NAME_MAX];
+       /* List of rnbd_srv_sess_dev structs */
+       struct list_head                sess_dev_list;
+       struct mutex                    lock;
+       int                             open_write_cnt;
+};
+
+/* Structure which binds N devices and N sessions */
+struct rnbd_srv_sess_dev {
+       /* Entry inside rnbd_srv_dev struct */
+       struct list_head                dev_list;
+       /* Entry inside rnbd_srv_session struct */
+       struct list_head                sess_list;
+       struct rnbd_dev                 *rnbd_dev;
+       struct rnbd_srv_session         *sess;
+       struct rnbd_srv_dev             *dev;
+       struct kobject                  kobj;
+       u32                             device_id;
+       fmode_t                         open_flags;
+       struct kref                     kref;
+       struct completion               *destroy_comp;
+       char                            pathname[NAME_MAX];
+       enum rnbd_access_mode           access_mode;
+};
+
+/* rnbd-srv-sysfs.c */
+
+int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
+                             struct block_device *bdev,
+                             const char *dir_name);
+void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev);
+int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
+void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
+int rnbd_srv_create_sysfs_files(void);
+void rnbd_srv_destroy_sysfs_files(void);
+void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev);
+
+#endif /* RNBD_SRV_H */