LXR linux/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
  20struct 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
  35struct 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 */
  49struct 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
  67void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
  68                                   struct kobj_attribute *attr);
  69/* rnbd-srv-sysfs.c */
  70
  71int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
  72                              struct block_device *bdev,
  73                              const char *dir_name);
  74void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev);
  75int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  76void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
  77int rnbd_srv_create_sysfs_files(void);
  78void rnbd_srv_destroy_sysfs_files(void);
  79void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id);
  80
  81#endif /* RNBD_SRV_H */
  82