From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/linux/kobject.h | 259 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 include/linux/kobject.h (limited to 'include/linux/kobject.h') diff --git a/include/linux/kobject.h b/include/linux/kobject.h new file mode 100644 index 00000000000..765d660d3be --- /dev/null +++ b/include/linux/kobject.h @@ -0,0 +1,259 @@ +/* + * kobject.h - generic kernel object infrastructure. + * + * Copyright (c) 2002-2003 Patrick Mochel + * Copyright (c) 2002-2003 Open Source Development Labs + * + * This file is released under the GPLv2. + * + * + * Please read Documentation/kobject.txt before using the kobject + * interface, ESPECIALLY the parts about reference counts and object + * destructors. + */ + +#ifndef _KOBJECT_H_ +#define _KOBJECT_H_ + +#ifdef __KERNEL__ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define KOBJ_NAME_LEN 20 + +/* counter to tag the hotplug event, read only except for the kobject core */ +extern u64 hotplug_seqnum; + +struct kobject { + char * k_name; + char name[KOBJ_NAME_LEN]; + struct kref kref; + struct list_head entry; + struct kobject * parent; + struct kset * kset; + struct kobj_type * ktype; + struct dentry * dentry; +}; + +extern int kobject_set_name(struct kobject *, const char *, ...) + __attribute__((format(printf,2,3))); + +static inline char * kobject_name(struct kobject * kobj) +{ + return kobj->k_name; +} + +extern void kobject_init(struct kobject *); +extern void kobject_cleanup(struct kobject *); + +extern int kobject_add(struct kobject *); +extern void kobject_del(struct kobject *); + +extern int kobject_rename(struct kobject *, char *new_name); + +extern int kobject_register(struct kobject *); +extern void kobject_unregister(struct kobject *); + +extern struct kobject * kobject_get(struct kobject *); +extern void kobject_put(struct kobject *); + +extern char * kobject_get_path(struct kobject *, int); + +struct kobj_type { + void (*release)(struct kobject *); + struct sysfs_ops * sysfs_ops; + struct attribute ** default_attrs; +}; + + +/** + * kset - a set of kobjects of a specific type, belonging + * to a specific subsystem. + * + * All kobjects of a kset should be embedded in an identical + * type. This type may have a descriptor, which the kset points + * to. This allows there to exist sets of objects of the same + * type in different subsystems. + * + * A subsystem does not have to be a list of only one type + * of object; multiple ksets can belong to one subsystem. All + * ksets of a subsystem share the subsystem's lock. + * + * Each kset can support hotplugging; if it does, it will be given + * the opportunity to filter out specific kobjects from being + * reported, as well as to add its own "data" elements to the + * environment being passed to the hotplug helper. + */ +struct kset_hotplug_ops { + int (*filter)(struct kset *kset, struct kobject *kobj); + char *(*name)(struct kset *kset, struct kobject *kobj); + int (*hotplug)(struct kset *kset, struct kobject *kobj, char **envp, + int num_envp, char *buffer, int buffer_size); +}; + +struct kset { + struct subsystem * subsys; + struct kobj_type * ktype; + struct list_head list; + spinlock_t list_lock; + struct kobject kobj; + struct kset_hotplug_ops * hotplug_ops; +}; + + +extern void kset_init(struct kset * k); +extern int kset_add(struct kset * k); +extern int kset_register(struct kset * k); +extern void kset_unregister(struct kset * k); + +static inline struct kset * to_kset(struct kobject * kobj) +{ + return kobj ? container_of(kobj,struct kset,kobj) : NULL; +} + +static inline struct kset * kset_get(struct kset * k) +{ + return k ? to_kset(kobject_get(&k->kobj)) : NULL; +} + +static inline void kset_put(struct kset * k) +{ + kobject_put(&k->kobj); +} + +static inline struct kobj_type * get_ktype(struct kobject * k) +{ + if (k->kset && k->kset->ktype) + return k->kset->ktype; + else + return k->ktype; +} + +extern struct kobject * kset_find_obj(struct kset *, const char *); + + +/** + * Use this when initializing an embedded kset with no other + * fields to initialize. + */ +#define set_kset_name(str) .kset = { .kobj = { .name = str } } + + + +struct subsystem { + struct kset kset; + struct rw_semaphore rwsem; +}; + +#define decl_subsys(_name,_type,_hotplug_ops) \ +struct subsystem _name##_subsys = { \ + .kset = { \ + .kobj = { .name = __stringify(_name) }, \ + .ktype = _type, \ + .hotplug_ops =_hotplug_ops, \ + } \ +} +#define decl_subsys_name(_varname,_name,_type,_hotplug_ops) \ +struct subsystem _varname##_subsys = { \ + .kset = { \ + .kobj = { .name = __stringify(_name) }, \ + .ktype = _type, \ + .hotplug_ops =_hotplug_ops, \ + } \ +} + +/* The global /sys/kernel/ subsystem for people to chain off of */ +extern struct subsystem kernel_subsys; + +/** + * Helpers for setting the kset of registered objects. + * Often, a registered object belongs to a kset embedded in a + * subsystem. These do no magic, just make the resulting code + * easier to follow. + */ + +/** + * kobj_set_kset_s(obj,subsys) - set kset for embedded kobject. + * @obj: ptr to some object type. + * @subsys: a subsystem object (not a ptr). + * + * Can be used for any object type with an embedded ->kobj. + */ + +#define kobj_set_kset_s(obj,subsys) \ + (obj)->kobj.kset = &(subsys).kset + +/** + * kset_set_kset_s(obj,subsys) - set kset for embedded kset. + * @obj: ptr to some object type. + * @subsys: a subsystem object (not a ptr). + * + * Can be used for any object type with an embedded ->kset. + * Sets the kset of @obj's embedded kobject (via its embedded + * kset) to @subsys.kset. This makes @obj a member of that + * kset. + */ + +#define kset_set_kset_s(obj,subsys) \ + (obj)->kset.kobj.kset = &(subsys).kset + +/** + * subsys_set_kset(obj,subsys) - set kset for subsystem + * @obj: ptr to some object type. + * @subsys: a subsystem object (not a ptr). + * + * Can be used for any object type with an embedded ->subsys. + * Sets the kset of @obj's kobject to @subsys.kset. This makes + * the object a member of that kset. + */ + +#define subsys_set_kset(obj,_subsys) \ + (obj)->subsys.kset.kobj.kset = &(_subsys).kset + +extern void subsystem_init(struct subsystem *); +extern int subsystem_register(struct subsystem *); +extern void subsystem_unregister(struct subsystem *); + +static inline struct subsystem * subsys_get(struct subsystem * s) +{ + return s ? container_of(kset_get(&s->kset),struct subsystem,kset) : NULL; +} + +static inline void subsys_put(struct subsystem * s) +{ + kset_put(&s->kset); +} + +struct subsys_attribute { + struct attribute attr; + ssize_t (*show)(struct subsystem *, char *); + ssize_t (*store)(struct subsystem *, const char *, size_t); +}; + +extern int subsys_create_file(struct subsystem * , struct subsys_attribute *); +extern void subsys_remove_file(struct subsystem * , struct subsys_attribute *); + +#ifdef CONFIG_HOTPLUG +void kobject_hotplug(struct kobject *kobj, enum kobject_action action); +int add_hotplug_env_var(char **envp, int num_envp, int *cur_index, + char *buffer, int buffer_size, int *cur_len, + const char *format, ...) + __attribute__((format (printf, 7, 8))); +#else +static inline void kobject_hotplug(struct kobject *kobj, enum kobject_action action) { } +static inline int add_hotplug_env_var(char **envp, int num_envp, int *cur_index, + char *buffer, int buffer_size, int *cur_len, + const char *format, ...) +{ return 0; } +#endif + +#endif /* __KERNEL__ */ +#endif /* _KOBJECT_H_ */ -- cgit v1.2.3