1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
// 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.
*/
#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/stat.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include "rnbd-srv.h"
static struct device *rnbd_dev;
static const struct class rnbd_dev_class = {
.name = "rnbd-server",
};
static struct kobject *rnbd_devs_kobj;
static void rnbd_srv_dev_release(struct kobject *kobj)
{
struct rnbd_srv_dev *dev;
dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);
kfree(dev);
}
static struct kobj_type dev_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = rnbd_srv_dev_release
};
int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
struct block_device *bdev)
{
struct kobject *bdev_kobj;
int ret;
ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
rnbd_devs_kobj, "%pg", bdev);
if (ret) {
kobject_put(&dev->dev_kobj);
return ret;
}
dev->dev_sessions_kobj = kobject_create_and_add("sessions",
&dev->dev_kobj);
if (!dev->dev_sessions_kobj) {
ret = -ENOMEM;
goto free_dev_kobj;
}
bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
if (ret)
goto put_sess_kobj;
return 0;
put_sess_kobj:
kobject_put(dev->dev_sessions_kobj);
free_dev_kobj:
kobject_del(&dev->dev_kobj);
kobject_put(&dev->dev_kobj);
return ret;
}
void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
{
sysfs_remove_link(&dev->dev_kobj, "block_dev");
kobject_del(dev->dev_sessions_kobj);
kobject_put(dev->dev_sessions_kobj);
kobject_del(&dev->dev_kobj);
kobject_put(&dev->dev_kobj);
}
static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
char *page)
{
struct rnbd_srv_sess_dev *sess_dev;
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
return sysfs_emit(page, "%d\n", sess_dev->readonly);
}
static struct kobj_attribute rnbd_srv_dev_session_ro_attr =
__ATTR_RO(read_only);
static ssize_t access_mode_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *page)
{
struct rnbd_srv_sess_dev *sess_dev;
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
return sysfs_emit(page, "%s\n",
rnbd_access_modes[sess_dev->access_mode].str);
}
static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr =
__ATTR_RO(access_mode);
static ssize_t mapping_path_show(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
struct rnbd_srv_sess_dev *sess_dev;
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
return sysfs_emit(page, "%s\n", sess_dev->pathname);
}
static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr =
__ATTR_RO(mapping_path);
static ssize_t rnbd_srv_dev_session_force_close_show(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return sysfs_emit(page, "Usage: echo 1 > %s\n",
attr->attr.name);
}
static ssize_t rnbd_srv_dev_session_force_close_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct rnbd_srv_sess_dev *sess_dev;
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
if (!sysfs_streq(buf, "1")) {
rnbd_srv_err(sess_dev, "%s: invalid value: '%s'\n",
attr->attr.name, buf);
return -EINVAL;
}
rnbd_srv_info(sess_dev, "force close requested\n");
rnbd_srv_sess_dev_force_close(sess_dev, attr);
return count;
}
static struct kobj_attribute rnbd_srv_dev_session_force_close_attr =
__ATTR(force_close, 0644,
rnbd_srv_dev_session_force_close_show,
rnbd_srv_dev_session_force_close_store);
static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = {
&rnbd_srv_dev_session_access_mode_attr.attr,
&rnbd_srv_dev_session_ro_attr.attr,
&rnbd_srv_dev_session_mapping_path_attr.attr,
&rnbd_srv_dev_session_force_close_attr.attr,
NULL,
};
static struct attribute_group rnbd_srv_default_dev_session_attr_group = {
.attrs = rnbd_srv_default_dev_sessions_attrs,
};
void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
{
sysfs_remove_group(&sess_dev->kobj,
&rnbd_srv_default_dev_session_attr_group);
kobject_del(&sess_dev->kobj);
kobject_put(&sess_dev->kobj);
}
static void rnbd_srv_sess_dev_release(struct kobject *kobj)
{
struct rnbd_srv_sess_dev *sess_dev;
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
rnbd_destroy_sess_dev(sess_dev, sess_dev->keep_id);
}
static struct kobj_type rnbd_srv_sess_dev_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = rnbd_srv_sess_dev_release,
};
int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
{
int ret;
ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype,
sess_dev->dev->dev_sessions_kobj, "%s",
sess_dev->sess->sessname);
if (ret) {
kobject_put(&sess_dev->kobj);
return ret;
}
ret = sysfs_create_group(&sess_dev->kobj,
&rnbd_srv_default_dev_session_attr_group);
if (ret) {
kobject_del(&sess_dev->kobj);
kobject_put(&sess_dev->kobj);
}
return ret;
}
int rnbd_srv_create_sysfs_files(void)
{
int err;
err = class_register(&rnbd_dev_class);
if (err)
return err;
rnbd_dev = device_create(&rnbd_dev_class, NULL,
MKDEV(0, 0), NULL, "ctl");
if (IS_ERR(rnbd_dev)) {
err = PTR_ERR(rnbd_dev);
goto cls_destroy;
}
rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
if (!rnbd_devs_kobj) {
err = -ENOMEM;
goto dev_destroy;
}
return 0;
dev_destroy:
device_destroy(&rnbd_dev_class, MKDEV(0, 0));
cls_destroy:
class_unregister(&rnbd_dev_class);
return err;
}
void rnbd_srv_destroy_sysfs_files(void)
{
kobject_del(rnbd_devs_kobj);
kobject_put(rnbd_devs_kobj);
device_destroy(&rnbd_dev_class, MKDEV(0, 0));
class_unregister(&rnbd_dev_class);
}
|
