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8
9#undef pr_fmt
10#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
11
12#include <uapi/linux/limits.h>
13#include <linux/kobject.h>
14#include <linux/sysfs.h>
15#include <linux/stat.h>
16#include <linux/list.h>
17#include <linux/moduleparam.h>
18#include <linux/device.h>
19
20#include "rnbd-srv.h"
21
22static struct device *rnbd_dev;
23static struct class *rnbd_dev_class;
24static struct kobject *rnbd_devs_kobj;
25
26static void rnbd_srv_dev_release(struct kobject *kobj)
27{
28 struct rnbd_srv_dev *dev;
29
30 dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);
31
32 kfree(dev);
33}
34
35static struct kobj_type dev_ktype = {
36 .sysfs_ops = &kobj_sysfs_ops,
37 .release = rnbd_srv_dev_release
38};
39
40int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
41 struct block_device *bdev,
42 const char *dev_name)
43{
44 struct kobject *bdev_kobj;
45 int ret;
46
47 ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
48 rnbd_devs_kobj, dev_name);
49 if (ret) {
50 kobject_put(&dev->dev_kobj);
51 return ret;
52 }
53
54 dev->dev_sessions_kobj = kobject_create_and_add("sessions",
55 &dev->dev_kobj);
56 if (!dev->dev_sessions_kobj) {
57 ret = -ENOMEM;
58 goto free_dev_kobj;
59 }
60
61 bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
62 ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
63 if (ret)
64 goto put_sess_kobj;
65
66 return 0;
67
68put_sess_kobj:
69 kobject_put(dev->dev_sessions_kobj);
70free_dev_kobj:
71 kobject_del(&dev->dev_kobj);
72 kobject_put(&dev->dev_kobj);
73 return ret;
74}
75
76void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
77{
78 sysfs_remove_link(&dev->dev_kobj, "block_dev");
79 kobject_del(dev->dev_sessions_kobj);
80 kobject_put(dev->dev_sessions_kobj);
81 kobject_del(&dev->dev_kobj);
82 kobject_put(&dev->dev_kobj);
83}
84
85static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
86 char *page)
87{
88 struct rnbd_srv_sess_dev *sess_dev;
89
90 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
91
92 return sysfs_emit(page, "%d\n",
93 !(sess_dev->open_flags & FMODE_WRITE));
94}
95
96static struct kobj_attribute rnbd_srv_dev_session_ro_attr =
97 __ATTR_RO(read_only);
98
99static ssize_t access_mode_show(struct kobject *kobj,
100 struct kobj_attribute *attr,
101 char *page)
102{
103 struct rnbd_srv_sess_dev *sess_dev;
104
105 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
106
107 return sysfs_emit(page, "%s\n",
108 rnbd_access_mode_str(sess_dev->access_mode));
109}
110
111static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr =
112 __ATTR_RO(access_mode);
113
114static ssize_t mapping_path_show(struct kobject *kobj,
115 struct kobj_attribute *attr, char *page)
116{
117 struct rnbd_srv_sess_dev *sess_dev;
118
119 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
120
121 return sysfs_emit(page, "%s\n", sess_dev->pathname);
122}
123
124static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr =
125 __ATTR_RO(mapping_path);
126
127static ssize_t rnbd_srv_dev_session_force_close_show(struct kobject *kobj,
128 struct kobj_attribute *attr, char *page)
129{
130 return sysfs_emit(page, "Usage: echo 1 > %s\n",
131 attr->attr.name);
132}
133
134static ssize_t rnbd_srv_dev_session_force_close_store(struct kobject *kobj,
135 struct kobj_attribute *attr,
136 const char *buf, size_t count)
137{
138 struct rnbd_srv_sess_dev *sess_dev;
139
140 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
141
142 if (!sysfs_streq(buf, "1")) {
143 rnbd_srv_err(sess_dev, "%s: invalid value: '%s'\n",
144 attr->attr.name, buf);
145 return -EINVAL;
146 }
147
148 rnbd_srv_info(sess_dev, "force close requested\n");
149 rnbd_srv_sess_dev_force_close(sess_dev, attr);
150
151 return count;
152}
153
154static struct kobj_attribute rnbd_srv_dev_session_force_close_attr =
155 __ATTR(force_close, 0644,
156 rnbd_srv_dev_session_force_close_show,
157 rnbd_srv_dev_session_force_close_store);
158
159static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = {
160 &rnbd_srv_dev_session_access_mode_attr.attr,
161 &rnbd_srv_dev_session_ro_attr.attr,
162 &rnbd_srv_dev_session_mapping_path_attr.attr,
163 &rnbd_srv_dev_session_force_close_attr.attr,
164 NULL,
165};
166
167static struct attribute_group rnbd_srv_default_dev_session_attr_group = {
168 .attrs = rnbd_srv_default_dev_sessions_attrs,
169};
170
171void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
172{
173 sysfs_remove_group(&sess_dev->kobj,
174 &rnbd_srv_default_dev_session_attr_group);
175
176 kobject_del(&sess_dev->kobj);
177 kobject_put(&sess_dev->kobj);
178}
179
180static void rnbd_srv_sess_dev_release(struct kobject *kobj)
181{
182 struct rnbd_srv_sess_dev *sess_dev;
183
184 sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
185 rnbd_destroy_sess_dev(sess_dev, sess_dev->keep_id);
186}
187
188static struct kobj_type rnbd_srv_sess_dev_ktype = {
189 .sysfs_ops = &kobj_sysfs_ops,
190 .release = rnbd_srv_sess_dev_release,
191};
192
193int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
194{
195 int ret;
196
197 ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype,
198 sess_dev->dev->dev_sessions_kobj, "%s",
199 sess_dev->sess->sessname);
200 if (ret) {
201 kobject_put(&sess_dev->kobj);
202 return ret;
203 }
204
205 ret = sysfs_create_group(&sess_dev->kobj,
206 &rnbd_srv_default_dev_session_attr_group);
207 if (ret) {
208 kobject_del(&sess_dev->kobj);
209 kobject_put(&sess_dev->kobj);
210 }
211
212 return ret;
213}
214
215int rnbd_srv_create_sysfs_files(void)
216{
217 int err;
218
219 rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server");
220 if (IS_ERR(rnbd_dev_class))
221 return PTR_ERR(rnbd_dev_class);
222
223 rnbd_dev = device_create(rnbd_dev_class, NULL,
224 MKDEV(0, 0), NULL, "ctl");
225 if (IS_ERR(rnbd_dev)) {
226 err = PTR_ERR(rnbd_dev);
227 goto cls_destroy;
228 }
229 rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
230 if (!rnbd_devs_kobj) {
231 err = -ENOMEM;
232 goto dev_destroy;
233 }
234
235 return 0;
236
237dev_destroy:
238 device_destroy(rnbd_dev_class, MKDEV(0, 0));
239cls_destroy:
240 class_destroy(rnbd_dev_class);
241
242 return err;
243}
244
245void rnbd_srv_destroy_sysfs_files(void)
246{
247 kobject_del(rnbd_devs_kobj);
248 kobject_put(rnbd_devs_kobj);
249 device_destroy(rnbd_dev_class, MKDEV(0, 0));
250 class_destroy(rnbd_dev_class);
251}
252