Commit d4c6957d authored by Jack Wang's avatar Jack Wang Committed by Jason Gunthorpe
Browse files

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: default avatarDanil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: default avatarJack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Acked-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 1eb54f8f

drivers/block/rnbd/rnbd-srv.h

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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 */