block/rnbd/rnbd-srv.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * RDMA Network Block Driver
0004  *
0005  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
0006  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
0007  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
0008  */
0009 #ifndef RNBD_SRV_H
0010 #define RNBD_SRV_H
0011
0012 #include <linux/types.h>
0013 #include <linux/idr.h>
0014 #include <linux/kref.h>
0015
0016 #include <rtrs.h>
0017 #include "rnbd-proto.h"
0018 #include "rnbd-log.h"
0019
0020 struct rnbd_srv_session {
0021     /* Entry inside global sess_list */
0022     struct list_head        list;
0023     struct rtrs_srv_sess    *rtrs;
0024     char            sessname[NAME_MAX];
0025     int         queue_depth;
0026
0027     struct xarray       index_idr;
0028     struct mutex        lock;
0029     u8          ver;
0030 };
0031
0032 struct rnbd_srv_dev {
0033     /* Entry inside global dev_list */
0034     struct list_head                list;
0035     struct kobject                  dev_kobj;
0036     struct kobject                  *dev_sessions_kobj;
0037     struct kref                     kref;
0038     char                id[NAME_MAX];
0039     /* List of rnbd_srv_sess_dev structs */
0040     struct list_head        sess_dev_list;
0041     struct mutex            lock;
0042     int             open_write_cnt;
0043 };
0044
0045 /* Structure which binds N devices and N sessions */
0046 struct rnbd_srv_sess_dev {
0047     /* Entry inside rnbd_srv_dev struct */
0048     struct list_head        dev_list;
0049     struct rnbd_dev         *rnbd_dev;
0050     struct rnbd_srv_session     *sess;
0051     struct rnbd_srv_dev     *dev;
0052     struct kobject                  kobj;
0053     u32                             device_id;
0054     bool                keep_id;
0055     fmode_t                         open_flags;
0056     struct kref         kref;
0057     struct completion               *destroy_comp;
0058     char                pathname[NAME_MAX];
0059     enum rnbd_access_mode       access_mode;
0060 };
0061
0062 void rnbd_srv_sess_dev_force_close(struct rnbd_srv_sess_dev *sess_dev,
0063                    struct kobj_attribute *attr);
0064 /* rnbd-srv-sysfs.c */
0065
0066 int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
0067                   struct block_device *bdev);
0068 void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev);
0069 int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
0070 void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev);
0071 int rnbd_srv_create_sysfs_files(void);
0072 void rnbd_srv_destroy_sysfs_files(void);
0073 void rnbd_destroy_sess_dev(struct rnbd_srv_sess_dev *sess_dev, bool keep_id);
0074
0075 #endif /* RNBD_SRV_H */