1 /*
2  * raid_class.h - a generic raid visualisation class
3  *
4  * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
5  *
6  * This file is licensed under GPLv2
7  */
8 #include <linux/transport_class.h>
9 
10 struct raid_template {
11 	struct transport_container raid_attrs;
12 };
13 
14 struct raid_function_template {
15 	void *cookie;
16 	int (*is_raid)(struct device *);
17 	void (*get_resync)(struct device *);
18 	void (*get_state)(struct device *);
19 };
20 
21 enum raid_state {
22 	RAID_STATE_UNKNOWN = 0,
23 	RAID_STATE_ACTIVE,
24 	RAID_STATE_DEGRADED,
25 	RAID_STATE_RESYNCING,
26 	RAID_STATE_OFFLINE,
27 };
28 
29 enum raid_level {
30 	RAID_LEVEL_UNKNOWN = 0,
31 	RAID_LEVEL_LINEAR,
32 	RAID_LEVEL_0,
33 	RAID_LEVEL_1,
34 	RAID_LEVEL_10,
35 	RAID_LEVEL_1E,
36 	RAID_LEVEL_3,
37 	RAID_LEVEL_4,
38 	RAID_LEVEL_5,
39 	RAID_LEVEL_50,
40 	RAID_LEVEL_6,
41 	RAID_LEVEL_JBOD,
42 };
43 
44 struct raid_data {
45 	struct list_head component_list;
46 	int component_count;
47 	enum raid_level level;
48 	enum raid_state state;
49 	int resync;
50 };
51 
52 /* resync complete goes from 0 to this */
53 #define RAID_MAX_RESYNC		(10000)
54 
55 #define DEFINE_RAID_ATTRIBUTE(type, attr)				      \
56 static inline void							      \
57 raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
58 	struct device *device =						      \
59 		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
60 	struct raid_data *rd;						      \
61 	BUG_ON(!device);						      \
62 	rd = dev_get_drvdata(device);					      \
63 	rd->attr = value;						      \
64 }									      \
65 static inline type							      \
66 raid_get_##attr(struct raid_template *r, struct device *dev) {		      \
67 	struct device *device =						      \
68 		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
69 	struct raid_data *rd;						      \
70 	BUG_ON(!device);						      \
71 	rd = dev_get_drvdata(device);					      \
72 	return rd->attr;						      \
73 }
74 
75 DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
76 DEFINE_RAID_ATTRIBUTE(int, resync)
77 DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
78 
79 struct raid_template *raid_class_attach(struct raid_function_template *);
80 void raid_class_release(struct raid_template *);
81