1
2
3
4
5
6
7
8
9
10
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/list.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <linux/raid_class.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_host.h>
20
21#define RAID_NUM_ATTRS 3
22
23struct raid_internal {
24 struct raid_template r;
25 struct raid_function_template *f;
26
27 struct device_attribute private_attrs[RAID_NUM_ATTRS];
28
29
30 struct device_attribute *attrs[RAID_NUM_ATTRS + 1];
31};
32
33struct raid_component {
34 struct list_head node;
35 struct device dev;
36 int num;
37};
38
39#define to_raid_internal(tmpl) container_of(tmpl, struct raid_internal, r)
40
41#define tc_to_raid_internal(tcont) ({ \
42 struct raid_template *r = \
43 container_of(tcont, struct raid_template, raid_attrs); \
44 to_raid_internal(r); \
45})
46
47#define ac_to_raid_internal(acont) ({ \
48 struct transport_container *tc = \
49 container_of(acont, struct transport_container, ac); \
50 tc_to_raid_internal(tc); \
51})
52
53#define device_to_raid_internal(dev) ({ \
54 struct attribute_container *ac = \
55 attribute_container_classdev_to_container(dev); \
56 ac_to_raid_internal(ac); \
57})
58
59
60static int raid_match(struct attribute_container *cont, struct device *dev)
61{
62
63
64 struct raid_internal *i = ac_to_raid_internal(cont);
65
66#if defined(CONFIG_SCSI) || defined(CONFIG_SCSI_MODULE)
67 if (scsi_is_sdev_device(dev)) {
68 struct scsi_device *sdev = to_scsi_device(dev);
69
70 if (i->f->cookie != sdev->host->hostt)
71 return 0;
72
73 return i->f->is_raid(dev);
74 }
75#endif
76
77 return 0;
78}
79
80static int raid_setup(struct transport_container *tc, struct device *dev,
81 struct device *cdev)
82{
83 struct raid_data *rd;
84
85 BUG_ON(dev_get_drvdata(cdev));
86
87 rd = kzalloc(sizeof(*rd), GFP_KERNEL);
88 if (!rd)
89 return -ENOMEM;
90
91 INIT_LIST_HEAD(&rd->component_list);
92 dev_set_drvdata(cdev, rd);
93
94 return 0;
95}
96
97static int raid_remove(struct transport_container *tc, struct device *dev,
98 struct device *cdev)
99{
100 struct raid_data *rd = dev_get_drvdata(cdev);
101 struct raid_component *rc, *next;
102 dev_printk(KERN_ERR, dev, "RAID REMOVE\n");
103 dev_set_drvdata(cdev, NULL);
104 list_for_each_entry_safe(rc, next, &rd->component_list, node) {
105 list_del(&rc->node);
106 dev_printk(KERN_ERR, rc->dev.parent, "RAID COMPONENT REMOVE\n");
107 device_unregister(&rc->dev);
108 }
109 dev_printk(KERN_ERR, dev, "RAID REMOVE DONE\n");
110 kfree(rd);
111 return 0;
112}
113
114static DECLARE_TRANSPORT_CLASS(raid_class,
115 "raid_devices",
116 raid_setup,
117 raid_remove,
118 NULL);
119
120static const struct {
121 enum raid_state value;
122 char *name;
123} raid_states[] = {
124 { RAID_STATE_UNKNOWN, "unknown" },
125 { RAID_STATE_ACTIVE, "active" },
126 { RAID_STATE_DEGRADED, "degraded" },
127 { RAID_STATE_RESYNCING, "resyncing" },
128 { RAID_STATE_OFFLINE, "offline" },
129};
130
131static const char *raid_state_name(enum raid_state state)
132{
133 int i;
134 char *name = NULL;
135
136 for (i = 0; i < ARRAY_SIZE(raid_states); i++) {
137 if (raid_states[i].value == state) {
138 name = raid_states[i].name;
139 break;
140 }
141 }
142 return name;
143}
144
145static struct {
146 enum raid_level value;
147 char *name;
148} raid_levels[] = {
149 { RAID_LEVEL_UNKNOWN, "unknown" },
150 { RAID_LEVEL_LINEAR, "linear" },
151 { RAID_LEVEL_0, "raid0" },
152 { RAID_LEVEL_1, "raid1" },
153 { RAID_LEVEL_10, "raid10" },
154 { RAID_LEVEL_1E, "raid1e" },
155 { RAID_LEVEL_3, "raid3" },
156 { RAID_LEVEL_4, "raid4" },
157 { RAID_LEVEL_5, "raid5" },
158 { RAID_LEVEL_50, "raid50" },
159 { RAID_LEVEL_6, "raid6" },
160};
161
162static const char *raid_level_name(enum raid_level level)
163{
164 int i;
165 char *name = NULL;
166
167 for (i = 0; i < ARRAY_SIZE(raid_levels); i++) {
168 if (raid_levels[i].value == level) {
169 name = raid_levels[i].name;
170 break;
171 }
172 }
173 return name;
174}
175
176#define raid_attr_show_internal(attr, fmt, var, code) \
177static ssize_t raid_show_##attr(struct device *dev, \
178 struct device_attribute *attr, \
179 char *buf) \
180{ \
181 struct raid_data *rd = dev_get_drvdata(dev); \
182 code \
183 return snprintf(buf, 20, #fmt "\n", var); \
184}
185
186#define raid_attr_ro_states(attr, states, code) \
187raid_attr_show_internal(attr, %s, name, \
188 const char *name; \
189 code \
190 name = raid_##states##_name(rd->attr); \
191) \
192static DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL)
193
194
195#define raid_attr_ro_internal(attr, code) \
196raid_attr_show_internal(attr, %d, rd->attr, code) \
197static DEVICE_ATTR(attr, S_IRUGO, raid_show_##attr, NULL)
198
199#define ATTR_CODE(attr) \
200 struct raid_internal *i = device_to_raid_internal(dev); \
201 if (i->f->get_##attr) \
202 i->f->get_##attr(dev->parent);
203
204#define raid_attr_ro(attr) raid_attr_ro_internal(attr, )
205#define raid_attr_ro_fn(attr) raid_attr_ro_internal(attr, ATTR_CODE(attr))
206#define raid_attr_ro_state(attr) raid_attr_ro_states(attr, attr, )
207#define raid_attr_ro_state_fn(attr) raid_attr_ro_states(attr, attr, ATTR_CODE(attr))
208
209
210raid_attr_ro_state(level);
211raid_attr_ro_fn(resync);
212raid_attr_ro_state_fn(state);
213
214static void raid_component_release(struct device *dev)
215{
216 struct raid_component *rc =
217 container_of(dev, struct raid_component, dev);
218 dev_printk(KERN_ERR, rc->dev.parent, "COMPONENT RELEASE\n");
219 put_device(rc->dev.parent);
220 kfree(rc);
221}
222
223int raid_component_add(struct raid_template *r,struct device *raid_dev,
224 struct device *component_dev)
225{
226 struct device *cdev =
227 attribute_container_find_class_device(&r->raid_attrs.ac,
228 raid_dev);
229 struct raid_component *rc;
230 struct raid_data *rd = dev_get_drvdata(cdev);
231 int err;
232
233 rc = kzalloc(sizeof(*rc), GFP_KERNEL);
234 if (!rc)
235 return -ENOMEM;
236
237 INIT_LIST_HEAD(&rc->node);
238 device_initialize(&rc->dev);
239 rc->dev.release = raid_component_release;
240 rc->dev.parent = get_device(component_dev);
241 rc->num = rd->component_count++;
242
243 dev_set_name(&rc->dev, "component-%d", rc->num);
244 list_add_tail(&rc->node, &rd->component_list);
245 rc->dev.class = &raid_class.class;
246 err = device_add(&rc->dev);
247 if (err)
248 goto err_out;
249
250 return 0;
251
252err_out:
253 list_del(&rc->node);
254 rd->component_count--;
255 put_device(component_dev);
256 kfree(rc);
257 return err;
258}
259EXPORT_SYMBOL(raid_component_add);
260
261struct raid_template *
262raid_class_attach(struct raid_function_template *ft)
263{
264 struct raid_internal *i = kzalloc(sizeof(struct raid_internal),
265 GFP_KERNEL);
266 int count = 0;
267
268 if (unlikely(!i))
269 return NULL;
270
271 i->f = ft;
272
273 i->r.raid_attrs.ac.class = &raid_class.class;
274 i->r.raid_attrs.ac.match = raid_match;
275 i->r.raid_attrs.ac.attrs = &i->attrs[0];
276
277 attribute_container_register(&i->r.raid_attrs.ac);
278
279 i->attrs[count++] = &dev_attr_level;
280 i->attrs[count++] = &dev_attr_resync;
281 i->attrs[count++] = &dev_attr_state;
282
283 i->attrs[count] = NULL;
284 BUG_ON(count > RAID_NUM_ATTRS);
285
286 return &i->r;
287}
288EXPORT_SYMBOL(raid_class_attach);
289
290void
291raid_class_release(struct raid_template *r)
292{
293 struct raid_internal *i = to_raid_internal(r);
294
295 BUG_ON(attribute_container_unregister(&i->r.raid_attrs.ac));
296
297 kfree(i);
298}
299EXPORT_SYMBOL(raid_class_release);
300
301static __init int raid_init(void)
302{
303 return transport_class_register(&raid_class);
304}
305
306static __exit void raid_exit(void)
307{
308 transport_class_unregister(&raid_class);
309}
310
311MODULE_AUTHOR("James Bottomley");
312MODULE_DESCRIPTION("RAID device class");
313MODULE_LICENSE("GPL");
314
315module_init(raid_init);
316module_exit(raid_exit);
317
318
