drivers/block/rnbd/rnbd-srv.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * RDMA Network Block Driver
   4  *
   5  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
   6  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
   7  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
   8  */
   9 #ifndef RNBD_SRV_H
  10 #define RNBD_SRV_H
  11
  12 #include <linux/types.h>
  13 #include <linux/idr.h>
  14 #include <linux/kref.h>
  15
  16 #include <rtrs.h>
  17 #include "rnbd-proto.h"
  18 #include "rnbd-log.h"
  19
  20 struct rnbd_srv_session {
  21         /* Entry inside global sess_list */
  22         struct list_head        list;
  23         struct rtrs_srv_sess    *rtrs;
  24         char                    sessname[NAME_MAX];
  25         int                     queue_depth;
  26
  27         struct xarray           index_idr;
  28         struct mutex            lock;
  29         u8                      ver;
  30 };
  31
  32 struct rnbd_srv_dev {
  33         /* Entry inside global dev_list */
  34         struct list_head                list;
  35         struct kobject                  dev_kobj;
  36         struct kobject                  *dev_sessions_kobj;
  37         struct kref                     kref;
  38         char                            name[NAME_MAX];
  39         /* List of rnbd_srv_sess_dev structs */
  40         struct list_head                sess_dev_list;
  41         struct mutex                    lock;
  42         int                             open_write_cnt;
  43 };
  44
  45 /* Structure which binds N devices and N sessions */
  46 struct rnbd_srv_sess_dev {
  47         /* Entry inside rnbd_srv_dev struct */
  48         struct list_head                dev_list;
  49         struct file                     *bdev_file;
  50         struct rnbd_srv_session         *sess;
  51         struct rnbd_srv_dev             *dev;
  52         struct kobject                  kobj;
  53         u32                             device_id;
  54         bool                            keep_id;
  55         bool                            readonly;
  56         struct kref                     kref;
  57         struct completion               *destroy_comp;
  58         char                            pathname[NAME_MAX];
  59         enum rnbd_access_mode           access_mode;
  60 };
  61
  62 void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
  63                                    struct kobj_attribute *attr);
  64 /* rnbd-srv-sysfs.c */
  65
  66 int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
  67                               struct block_device *bdev);
  68 void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev);
  69 int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  70 void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  71 int rnbd_srv_create_sysfs_files(void);
  72 void rnbd_srv_destroy_sysfs_files(void);
  73 void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id);
  74
  75 #endif /* RNBD_SRV_H */