1struct sysfs_dirent {
2	atomic_t		s_count;
3	struct list_head	s_sibling;
4	struct list_head	s_children;
5	void 			* s_element;
6	int			s_type;
7	umode_t			s_mode;
8	ino_t			s_ino;
9	struct dentry		* s_dentry;
10	struct iattr		* s_iattr;
11	atomic_t		s_event;
12};
13
14extern struct vfsmount * sysfs_mount;
15extern struct kmem_cache *sysfs_dir_cachep;
16
17extern void sysfs_delete_inode(struct inode *inode);
18extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
19extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
20
21extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
22extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
23				umode_t, int);
24
25extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
26extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
27extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
28
29extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
30extern void sysfs_remove_subdir(struct dentry *);
31
32extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
33extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
34extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
35
36extern spinlock_t sysfs_lock;
37extern struct rw_semaphore sysfs_rename_sem;
38extern struct super_block * sysfs_sb;
39extern const struct file_operations sysfs_dir_operations;
40extern const struct file_operations sysfs_file_operations;
41extern const struct file_operations bin_fops;
42extern const struct inode_operations sysfs_dir_inode_operations;
43extern const struct inode_operations sysfs_symlink_inode_operations;
44
45struct sysfs_symlink {
46	char * link_name;
47	struct kobject * target_kobj;
48};
49
50struct sysfs_buffer {
51	struct list_head		associates;
52	size_t				count;
53	loff_t				pos;
54	char				* page;
55	struct sysfs_ops		* ops;
56	struct semaphore		sem;
57	int				orphaned;
58	int				needs_read_fill;
59	int				event;
60};
61
62struct sysfs_buffer_collection {
63	struct list_head	associates;
64};
65
66static inline struct kobject * to_kobj(struct dentry * dentry)
67{
68	struct sysfs_dirent * sd = dentry->d_fsdata;
69	return ((struct kobject *) sd->s_element);
70}
71
72static inline struct attribute * to_attr(struct dentry * dentry)
73{
74	struct sysfs_dirent * sd = dentry->d_fsdata;
75	return ((struct attribute *) sd->s_element);
76}
77
78static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
79{
80	struct sysfs_dirent * sd = dentry->d_fsdata;
81	return ((struct bin_attribute *) sd->s_element);
82}
83
84static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
85{
86	struct kobject * kobj = NULL;
87
88	spin_lock(&dcache_lock);
89	if (!d_unhashed(dentry)) {
90		struct sysfs_dirent * sd = dentry->d_fsdata;
91		if (sd->s_type & SYSFS_KOBJ_LINK) {
92			struct sysfs_symlink * sl = sd->s_element;
93			kobj = kobject_get(sl->target_kobj);
94		} else
95			kobj = kobject_get(sd->s_element);
96	}
97	spin_unlock(&dcache_lock);
98
99	return kobj;
100}
101
102static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
103{
104	if (sd->s_type & SYSFS_KOBJ_LINK) {
105		struct sysfs_symlink * sl = sd->s_element;
106		kfree(sl->link_name);
107		kobject_put(sl->target_kobj);
108		kfree(sl);
109	}
110	kfree(sd->s_iattr);
111	kmem_cache_free(sysfs_dir_cachep, sd);
112}
113
114static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
115{
116	if (sd) {
117		WARN_ON(!atomic_read(&sd->s_count));
118		atomic_inc(&sd->s_count);
119	}
120	return sd;
121}
122
123static inline void sysfs_put(struct sysfs_dirent * sd)
124{
125	if (atomic_dec_and_test(&sd->s_count))
126		release_sysfs_dirent(sd);
127}
128
129static inline int sysfs_is_shadowed_inode(struct inode *inode)
130{
131	return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
132}
133