include/linux/raid_class.h

   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_3,
  35         RAID_LEVEL_4,
  36         RAID_LEVEL_5,
  37         RAID_LEVEL_6,
  38 };
  39
  40 struct raid_data {
  41         struct list_head component_list;
  42         int component_count;
  43         enum raid_level level;
  44         enum raid_state state;
  45         int resync;
  46 };
  47
  48 /* resync complete goes from 0 to this */
  49 #define RAID_MAX_RESYNC         (10000)
  50
  51 #define DEFINE_RAID_ATTRIBUTE(type, attr)                                     \
  52 static inline void                                                            \
  53 raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
  54         struct class_device *cdev =                                           \
  55                 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
  56         struct raid_data *rd;                                                 \
  57         BUG_ON(!cdev);                                                        \
  58         rd = class_get_devdata(cdev);                                         \
  59         rd->attr = value;                                                     \
  60 }                                                                             \
  61 static inline type                                                            \
  62 raid_get_##attr(struct raid_template *r, struct device *dev) {                \
  63         struct class_device *cdev =                                           \
  64                 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
  65         struct raid_data *rd;                                                 \
  66         BUG_ON(!cdev);                                                        \
  67         rd = class_get_devdata(cdev);                                         \
  68         return rd->attr;                                                      \
  69 }
  70
  71 DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
  72 DEFINE_RAID_ATTRIBUTE(int, resync)
  73 DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
  74
  75 struct raid_template *raid_class_attach(struct raid_function_template *);
  76 void raid_class_release(struct raid_template *);
  77
  78 void raid_component_add(struct raid_template *, struct device *,
  79                         struct device *);