include/linux/raid_class.h

   1 /*
   2  */
   3 #include <linux/transport_class.h>
   4
   5 struct raid_template {
   6         struct transport_container raid_attrs;
   7 };
   8
   9 struct raid_function_template {
  10         void *cookie;
  11         int (*is_raid)(struct device *);
  12         void (*get_resync)(struct device *);
  13         void (*get_state)(struct device *);
  14 };
  15
  16 enum raid_state {
  17         RAID_ACTIVE = 1,
  18         RAID_DEGRADED,
  19         RAID_RESYNCING,
  20         RAID_OFFLINE,
  21 };
  22
  23 struct raid_data {
  24         struct list_head component_list;
  25         int component_count;
  26         int level;
  27         enum raid_state state;
  28         int resync;
  29 };
  30
  31 #define DEFINE_RAID_ATTRIBUTE(type, attr)                                     \
  32 static inline void                                                            \
  33 raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
  34         struct class_device *cdev =                                           \
  35                 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
  36         struct raid_data *rd;                                                 \
  37         BUG_ON(!cdev);                                                        \
  38         rd = class_get_devdata(cdev);                                         \
  39         rd->attr = value;                                                     \
  40 }                                                                             \
  41 static inline type                                                            \
  42 raid_get_##attr(struct raid_template *r, struct device *dev) {                \
  43         struct class_device *cdev =                                           \
  44                 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
  45         struct raid_data *rd;                                                 \
  46         BUG_ON(!cdev);                                                        \
  47         rd = class_get_devdata(cdev);                                         \
  48         return rd->attr;                                                      \
  49 }
  50
  51 DEFINE_RAID_ATTRIBUTE(int, level)
  52 DEFINE_RAID_ATTRIBUTE(int, resync)
  53 DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
  54
  55 struct raid_template *raid_class_attach(struct raid_function_template *);
  56 void raid_class_release(struct raid_template *);
  57
  58 void raid_component_add(struct raid_template *, struct device *,
  59                         struct device *);