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