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         *rtrs;
  24         char                    sessname[NAME_MAX];
  25         int                     queue_depth;
  26         struct bio_set          sess_bio_set;
  27
  28         struct xarray           index_idr;
  29         /* List of struct rnbd_srv_sess_dev */
  30         struct list_head        sess_dev_list;
  31         struct mutex            lock;
  32         u8                      ver;
  33 };
  34
  35 struct rnbd_srv_dev {
  36         /* Entry inside global dev_list */
  37         struct list_head                list;
  38         struct kobject                  dev_kobj;
  39         struct kobject                  *dev_sessions_kobj;
  40         struct kref                     kref;
  41         char                            id[NAME_MAX];
  42         /* List of rnbd_srv_sess_dev structs */
  43         struct list_head                sess_dev_list;
  44         struct mutex                    lock;
  45         int                             open_write_cnt;
  46 };
  47
  48 /* Structure which binds N devices and N sessions */
  49 struct rnbd_srv_sess_dev {
  50         /* Entry inside rnbd_srv_dev struct */
  51         struct list_head                dev_list;
  52         /* Entry inside rnbd_srv_session struct */
  53         struct list_head                sess_list;
  54         struct rnbd_dev                 *rnbd_dev;
  55         struct rnbd_srv_session         *sess;
  56         struct rnbd_srv_dev             *dev;
  57         struct kobject                  kobj;
  58         u32                             device_id;
  59         bool                            keep_id;
  60         fmode_t                         open_flags;
  61         struct kref                     kref;
  62         struct completion               *destroy_comp;
  63         char                            pathname[NAME_MAX];
  64         enum rnbd_access_mode           access_mode;
  65 };
  66
  67 void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev);
  68 /* rnbd-srv-sysfs.c */
  69
  70 int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
  71                               struct block_device *bdev,
  72                               const char *dir_name);
  73 void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev);
  74 int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  75 void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  76 int rnbd_srv_create_sysfs_files(void);
  77 void rnbd_srv_destroy_sysfs_files(void);
  78 void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id);
  79
  80 #endif /* RNBD_SRV_H */