1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * RDMA Network Block Driver
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.
10 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
12 #include <uapi/linux/limits.h>
13 #include <linux/kobject.h>
14 #include <linux/sysfs.h>
15 #include <linux/stat.h>
16 #include <linux/genhd.h>
17 #include <linux/list.h>
18 #include <linux/moduleparam.h>
19 #include <linux/device.h>
23 static struct device *rnbd_dev;
24 static struct class *rnbd_dev_class;
25 static struct kobject *rnbd_devs_kobj;
27 static void rnbd_srv_dev_release(struct kobject *kobj)
29 struct rnbd_srv_dev *dev;
31 dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);
36 static struct kobj_type dev_ktype = {
37 .sysfs_ops = &kobj_sysfs_ops,
38 .release = rnbd_srv_dev_release
41 int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
42 struct block_device *bdev,
45 struct kobject *bdev_kobj;
48 ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
49 rnbd_devs_kobj, dev_name);
51 kobject_put(&dev->dev_kobj);
55 dev->dev_sessions_kobj = kobject_create_and_add("sessions",
57 if (!dev->dev_sessions_kobj) {
62 bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
63 ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
70 kobject_put(dev->dev_sessions_kobj);
72 kobject_del(&dev->dev_kobj);
73 kobject_put(&dev->dev_kobj);
77 void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
79 sysfs_remove_link(&dev->dev_kobj, "block_dev");
80 kobject_del(dev->dev_sessions_kobj);
81 kobject_put(dev->dev_sessions_kobj);
82 kobject_del(&dev->dev_kobj);
83 kobject_put(&dev->dev_kobj);
86 static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
89 struct rnbd_srv_sess_dev *sess_dev;
91 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
93 return sysfs_emit(page, "%d\n",
94 !(sess_dev->open_flags & FMODE_WRITE));
97 static struct kobj_attribute rnbd_srv_dev_session_ro_attr =
100 static ssize_t access_mode_show(struct kobject *kobj,
101 struct kobj_attribute *attr,
104 struct rnbd_srv_sess_dev *sess_dev;
106 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
108 return sysfs_emit(page, "%s\n",
109 rnbd_access_mode_str(sess_dev->access_mode));
112 static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr =
113 __ATTR_RO(access_mode);
115 static ssize_t mapping_path_show(struct kobject *kobj,
116 struct kobj_attribute *attr, char *page)
118 struct rnbd_srv_sess_dev *sess_dev;
120 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
122 return sysfs_emit(page, "%s\n", sess_dev->pathname);
125 static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr =
126 __ATTR_RO(mapping_path);
128 static ssize_t rnbd_srv_dev_session_force_close_show(struct kobject *kobj,
129 struct kobj_attribute *attr, char *page)
131 return sysfs_emit(page, "Usage: echo 1 > %s\n",
135 static ssize_t rnbd_srv_dev_session_force_close_store(struct kobject *kobj,
136 struct kobj_attribute *attr,
137 const char *buf, size_t count)
139 struct rnbd_srv_sess_dev *sess_dev;
141 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
143 if (!sysfs_streq(buf, "1")) {
144 rnbd_srv_err(sess_dev, "%s: invalid value: '%s'\n",
145 attr->attr.name, buf);
149 rnbd_srv_info(sess_dev, "force close requested\n");
150 rnbd_srv_sess_dev_force_close(sess_dev, attr);
155 static struct kobj_attribute rnbd_srv_dev_session_force_close_attr =
156 __ATTR(force_close, 0644,
157 rnbd_srv_dev_session_force_close_show,
158 rnbd_srv_dev_session_force_close_store);
160 static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = {
161 &rnbd_srv_dev_session_access_mode_attr.attr,
162 &rnbd_srv_dev_session_ro_attr.attr,
163 &rnbd_srv_dev_session_mapping_path_attr.attr,
164 &rnbd_srv_dev_session_force_close_attr.attr,
168 static struct attribute_group rnbd_srv_default_dev_session_attr_group = {
169 .attrs = rnbd_srv_default_dev_sessions_attrs,
172 void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
174 sysfs_remove_group(&sess_dev->kobj,
175 &rnbd_srv_default_dev_session_attr_group);
177 kobject_del(&sess_dev->kobj);
178 kobject_put(&sess_dev->kobj);
181 static void rnbd_srv_sess_dev_release(struct kobject *kobj)
183 struct rnbd_srv_sess_dev *sess_dev;
185 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
186 rnbd_destroy_sess_dev(sess_dev, sess_dev->keep_id);
189 static struct kobj_type rnbd_srv_sess_dev_ktype = {
190 .sysfs_ops = &kobj_sysfs_ops,
191 .release = rnbd_srv_sess_dev_release,
194 int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
198 ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype,
199 sess_dev->dev->dev_sessions_kobj, "%s",
200 sess_dev->sess->sessname);
202 kobject_put(&sess_dev->kobj);
206 ret = sysfs_create_group(&sess_dev->kobj,
207 &rnbd_srv_default_dev_session_attr_group);
209 kobject_del(&sess_dev->kobj);
210 kobject_put(&sess_dev->kobj);
216 int rnbd_srv_create_sysfs_files(void)
220 rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server");
221 if (IS_ERR(rnbd_dev_class))
222 return PTR_ERR(rnbd_dev_class);
224 rnbd_dev = device_create(rnbd_dev_class, NULL,
225 MKDEV(0, 0), NULL, "ctl");
226 if (IS_ERR(rnbd_dev)) {
227 err = PTR_ERR(rnbd_dev);
230 rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
231 if (!rnbd_devs_kobj) {
239 device_destroy(rnbd_dev_class, MKDEV(0, 0));
241 class_destroy(rnbd_dev_class);
246 void rnbd_srv_destroy_sysfs_files(void)
248 kobject_del(rnbd_devs_kobj);
249 kobject_put(rnbd_devs_kobj);
250 device_destroy(rnbd_dev_class, MKDEV(0, 0));
251 class_destroy(rnbd_dev_class);