raid_class.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * raid_class.h - a generic raid visualisation class
 4 *
 5 * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
 6 */
 7#include <linux/transport_class.h>
 8
 9struct raid_template {
10	struct transport_container raid_attrs;
11};
12
13struct raid_function_template {
14	const void *cookie;
15	int (*is_raid)(struct device *);
16	void (*get_resync)(struct device *);
17	void (*get_state)(struct device *);
18};
19
20enum raid_state {
21	RAID_STATE_UNKNOWN = 0,
22	RAID_STATE_ACTIVE,
23	RAID_STATE_DEGRADED,
24	RAID_STATE_RESYNCING,
25	RAID_STATE_OFFLINE,
26};
27
28enum raid_level {
29	RAID_LEVEL_UNKNOWN = 0,
30	RAID_LEVEL_LINEAR,
31	RAID_LEVEL_0,
32	RAID_LEVEL_1,
33	RAID_LEVEL_10,
34	RAID_LEVEL_1E,
35	RAID_LEVEL_3,
36	RAID_LEVEL_4,
37	RAID_LEVEL_5,
38	RAID_LEVEL_50,
39	RAID_LEVEL_6,
40	RAID_LEVEL_JBOD,
41};
42
43struct raid_data {
44	struct list_head component_list;
45	int component_count;
46	enum raid_level level;
47	enum raid_state state;
48	int resync;
49};
50
51/* resync complete goes from 0 to this */
52#define RAID_MAX_RESYNC		(10000)
53
54#define DEFINE_RAID_ATTRIBUTE(type, attr)				      \
55static inline void							      \
56raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
57	struct device *device =						      \
58		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
59	struct raid_data *rd;						      \
60	BUG_ON(!device);						      \
61	rd = dev_get_drvdata(device);					      \
62	rd->attr = value;						      \
63}									      \
64static inline type							      \
65raid_get_##attr(struct raid_template *r, struct device *dev) {		      \
66	struct device *device =						      \
67		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
68	struct raid_data *rd;						      \
69	BUG_ON(!device);						      \
70	rd = dev_get_drvdata(device);					      \
71	return rd->attr;						      \
72}
73
74DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
75DEFINE_RAID_ATTRIBUTE(int, resync)
76DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
77	
78struct raid_template *raid_class_attach(struct raid_function_template *);
79void raid_class_release(struct raid_template *);