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

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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>
This commit is contained in:
Jack Wang 2020-05-11 15:51:25 +02:00 committed by Jason Gunthorpe
parent 1eb54f8f5d
commit d4c6957dd0
1 changed files with 78 additions and 0 deletions
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78
drivers/block/rnbd/rnbd-srv.h Normal file
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/* 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 */