diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/configfs.h | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/include/linux/configfs.h b/include/linux/configfs.h index fef6f3d0a4a..8c6967f3fb1 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -40,9 +40,9 @@ #include <linux/types.h> #include <linux/list.h> #include <linux/kref.h> +#include <linux/mutex.h> #include <asm/atomic.h> -#include <asm/semaphore.h> #define CONFIGFS_ITEM_NAME_LEN 20 @@ -75,7 +75,6 @@ extern void config_item_init(struct config_item *); extern void config_item_init_type_name(struct config_item *item, const char *name, struct config_item_type *type); -extern void config_item_cleanup(struct config_item *); extern struct config_item * config_item_get(struct config_item *); extern void config_item_put(struct config_item *); @@ -87,12 +86,10 @@ struct config_item_type { struct configfs_attribute **ct_attrs; }; - /** * group - a group of config_items of a specific type, belonging * to a specific subsystem. */ - struct config_group { struct config_item cg_item; struct list_head cg_children; @@ -100,13 +97,11 @@ struct config_group { struct config_group **default_groups; }; - extern void config_group_init(struct config_group *group); extern void config_group_init_type_name(struct config_group *group, const char *name, struct config_item_type *type); - static inline struct config_group *to_config_group(struct config_item *item) { return item ? container_of(item,struct config_group,cg_item) : NULL; @@ -122,7 +117,8 @@ static inline void config_group_put(struct config_group *group) config_item_put(&group->cg_item); } -extern struct config_item *config_group_find_obj(struct config_group *, const char *); +extern struct config_item *config_group_find_item(struct config_group *, + const char *); struct configfs_attribute { @@ -131,6 +127,22 @@ struct configfs_attribute { mode_t ca_mode; }; +/* + * Users often need to create attribute structures for their configurable + * attributes, containing a configfs_attribute member and function pointers + * for the show() and store() operations on that attribute. They can use + * this macro (similar to sysfs' __ATTR) to make defining attributes easier. + */ +#define __CONFIGFS_ATTR(_name, _mode, _show, _store) \ +{ \ + .attr = { \ + .ca_name = __stringify(_name), \ + .ca_mode = _mode, \ + .ca_owner = THIS_MODULE, \ + }, \ + .show = _show, \ + .store = _store, \ +} /* * If allow_link() exists, the item can symlink(2) out to other @@ -157,12 +169,13 @@ struct configfs_group_operations { struct config_item *(*make_item)(struct config_group *group, const char *name); struct config_group *(*make_group)(struct config_group *group, const char *name); int (*commit_item)(struct config_item *item); + void (*disconnect_notify)(struct config_group *group, struct config_item *item); void (*drop_item)(struct config_group *group, struct config_item *item); }; struct configfs_subsystem { struct config_group su_group; - struct semaphore su_sem; + struct mutex su_mutex; }; static inline struct configfs_subsystem *to_configfs_subsystem(struct config_group *group) @@ -175,6 +188,11 @@ static inline struct configfs_subsystem *to_configfs_subsystem(struct config_gro int configfs_register_subsystem(struct configfs_subsystem *subsys); void configfs_unregister_subsystem(struct configfs_subsystem *subsys); +/* These functions can sleep and can alloc with GFP_KERNEL */ +/* WARNING: These cannot be called underneath configfs callbacks!! */ +int configfs_depend_item(struct configfs_subsystem *subsys, struct config_item *target); +void configfs_undepend_item(struct configfs_subsystem *subsys, struct config_item *target); + #endif /* __KERNEL__ */ #endif /* _CONFIGFS_H_ */ |