fd4f2df24b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
259 lines
7 KiB
C
259 lines
7 KiB
C
/*
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* kobject.h - generic kernel object infrastructure.
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*
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* Copyright (c) 2002-2003 Patrick Mochel
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* Copyright (c) 2002-2003 Open Source Development Labs
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*
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* This file is released under the GPLv2.
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*
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*
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* Please read Documentation/kobject.txt before using the kobject
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* interface, ESPECIALLY the parts about reference counts and object
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* destructors.
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*/
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#ifndef _KOBJECT_H_
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#define _KOBJECT_H_
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/sysfs.h>
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#include <linux/spinlock.h>
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#include <linux/rwsem.h>
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#include <linux/kref.h>
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#include <linux/kobject_uevent.h>
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#include <linux/kernel.h>
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#include <asm/atomic.h>
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#define KOBJ_NAME_LEN 20
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/* counter to tag the hotplug event, read only except for the kobject core */
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extern u64 hotplug_seqnum;
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struct kobject {
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const char * k_name;
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char name[KOBJ_NAME_LEN];
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struct kref kref;
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struct list_head entry;
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struct kobject * parent;
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struct kset * kset;
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struct kobj_type * ktype;
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struct dentry * dentry;
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};
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extern int kobject_set_name(struct kobject *, const char *, ...)
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__attribute__((format(printf,2,3)));
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static inline const char * kobject_name(const struct kobject * kobj)
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{
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return kobj->k_name;
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}
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extern void kobject_init(struct kobject *);
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extern void kobject_cleanup(struct kobject *);
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extern int kobject_add(struct kobject *);
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extern void kobject_del(struct kobject *);
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extern int kobject_rename(struct kobject *, const char *new_name);
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extern int kobject_register(struct kobject *);
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extern void kobject_unregister(struct kobject *);
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extern struct kobject * kobject_get(struct kobject *);
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extern void kobject_put(struct kobject *);
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extern char * kobject_get_path(struct kobject *, gfp_t);
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struct kobj_type {
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void (*release)(struct kobject *);
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struct sysfs_ops * sysfs_ops;
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struct attribute ** default_attrs;
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};
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/**
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* kset - a set of kobjects of a specific type, belonging
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* to a specific subsystem.
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*
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* All kobjects of a kset should be embedded in an identical
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* type. This type may have a descriptor, which the kset points
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* to. This allows there to exist sets of objects of the same
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* type in different subsystems.
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*
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* A subsystem does not have to be a list of only one type
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* of object; multiple ksets can belong to one subsystem. All
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* ksets of a subsystem share the subsystem's lock.
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*
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* Each kset can support hotplugging; if it does, it will be given
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* the opportunity to filter out specific kobjects from being
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* reported, as well as to add its own "data" elements to the
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* environment being passed to the hotplug helper.
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*/
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struct kset_hotplug_ops {
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int (*filter)(struct kset *kset, struct kobject *kobj);
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const char *(*name)(struct kset *kset, struct kobject *kobj);
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int (*hotplug)(struct kset *kset, struct kobject *kobj, char **envp,
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int num_envp, char *buffer, int buffer_size);
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};
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struct kset {
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struct subsystem * subsys;
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struct kobj_type * ktype;
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struct list_head list;
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spinlock_t list_lock;
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struct kobject kobj;
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struct kset_hotplug_ops * hotplug_ops;
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};
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extern void kset_init(struct kset * k);
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extern int kset_add(struct kset * k);
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extern int kset_register(struct kset * k);
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extern void kset_unregister(struct kset * k);
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static inline struct kset * to_kset(struct kobject * kobj)
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{
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return kobj ? container_of(kobj,struct kset,kobj) : NULL;
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}
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static inline struct kset * kset_get(struct kset * k)
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{
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return k ? to_kset(kobject_get(&k->kobj)) : NULL;
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}
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static inline void kset_put(struct kset * k)
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{
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kobject_put(&k->kobj);
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}
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static inline struct kobj_type * get_ktype(struct kobject * k)
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{
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if (k->kset && k->kset->ktype)
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return k->kset->ktype;
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else
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return k->ktype;
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}
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extern struct kobject * kset_find_obj(struct kset *, const char *);
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/**
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* Use this when initializing an embedded kset with no other
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* fields to initialize.
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*/
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#define set_kset_name(str) .kset = { .kobj = { .name = str } }
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struct subsystem {
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struct kset kset;
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struct rw_semaphore rwsem;
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};
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#define decl_subsys(_name,_type,_hotplug_ops) \
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struct subsystem _name##_subsys = { \
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.kset = { \
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.kobj = { .name = __stringify(_name) }, \
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.ktype = _type, \
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.hotplug_ops =_hotplug_ops, \
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} \
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}
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#define decl_subsys_name(_varname,_name,_type,_hotplug_ops) \
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struct subsystem _varname##_subsys = { \
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.kset = { \
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.kobj = { .name = __stringify(_name) }, \
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.ktype = _type, \
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.hotplug_ops =_hotplug_ops, \
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} \
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}
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/* The global /sys/kernel/ subsystem for people to chain off of */
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extern struct subsystem kernel_subsys;
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/**
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* Helpers for setting the kset of registered objects.
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* Often, a registered object belongs to a kset embedded in a
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* subsystem. These do no magic, just make the resulting code
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* easier to follow.
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*/
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/**
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* kobj_set_kset_s(obj,subsys) - set kset for embedded kobject.
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* @obj: ptr to some object type.
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* @subsys: a subsystem object (not a ptr).
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*
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* Can be used for any object type with an embedded ->kobj.
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*/
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#define kobj_set_kset_s(obj,subsys) \
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(obj)->kobj.kset = &(subsys).kset
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/**
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* kset_set_kset_s(obj,subsys) - set kset for embedded kset.
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* @obj: ptr to some object type.
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* @subsys: a subsystem object (not a ptr).
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*
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* Can be used for any object type with an embedded ->kset.
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* Sets the kset of @obj's embedded kobject (via its embedded
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* kset) to @subsys.kset. This makes @obj a member of that
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* kset.
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*/
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#define kset_set_kset_s(obj,subsys) \
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(obj)->kset.kobj.kset = &(subsys).kset
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/**
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* subsys_set_kset(obj,subsys) - set kset for subsystem
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* @obj: ptr to some object type.
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* @subsys: a subsystem object (not a ptr).
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*
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* Can be used for any object type with an embedded ->subsys.
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* Sets the kset of @obj's kobject to @subsys.kset. This makes
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* the object a member of that kset.
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*/
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#define subsys_set_kset(obj,_subsys) \
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(obj)->subsys.kset.kobj.kset = &(_subsys).kset
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extern void subsystem_init(struct subsystem *);
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extern int subsystem_register(struct subsystem *);
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extern void subsystem_unregister(struct subsystem *);
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static inline struct subsystem * subsys_get(struct subsystem * s)
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{
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return s ? container_of(kset_get(&s->kset),struct subsystem,kset) : NULL;
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}
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static inline void subsys_put(struct subsystem * s)
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{
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kset_put(&s->kset);
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}
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struct subsys_attribute {
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struct attribute attr;
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ssize_t (*show)(struct subsystem *, char *);
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ssize_t (*store)(struct subsystem *, const char *, size_t);
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};
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extern int subsys_create_file(struct subsystem * , struct subsys_attribute *);
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extern void subsys_remove_file(struct subsystem * , struct subsys_attribute *);
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#ifdef CONFIG_HOTPLUG
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void kobject_hotplug(struct kobject *kobj, enum kobject_action action);
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int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
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char *buffer, int buffer_size, int *cur_len,
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const char *format, ...)
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__attribute__((format (printf, 7, 8)));
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#else
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static inline void kobject_hotplug(struct kobject *kobj, enum kobject_action action) { }
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static inline int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
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char *buffer, int buffer_size, int *cur_len,
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const char *format, ...)
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{ return 0; }
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#endif
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#endif /* __KERNEL__ */
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#endif /* _KOBJECT_H_ */
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