xref: /linux/fs/sysfs/sysfs.h (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
1 
2 extern struct vfsmount * sysfs_mount;
3 extern kmem_cache_t *sysfs_dir_cachep;
4 
5 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
6 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
7 
8 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
9 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
10 				umode_t, int);
11 
12 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
13 extern void sysfs_hash_and_remove(struct dentry * dir, const char * name);
14 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
15 
16 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
17 extern void sysfs_remove_subdir(struct dentry *);
18 
19 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
20 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
21 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
22 
23 extern struct rw_semaphore sysfs_rename_sem;
24 extern struct super_block * sysfs_sb;
25 extern const struct file_operations sysfs_dir_operations;
26 extern const struct file_operations sysfs_file_operations;
27 extern const struct file_operations bin_fops;
28 extern struct inode_operations sysfs_dir_inode_operations;
29 extern struct inode_operations sysfs_symlink_inode_operations;
30 
31 struct sysfs_symlink {
32 	char * link_name;
33 	struct kobject * target_kobj;
34 };
35 
36 static inline struct kobject * to_kobj(struct dentry * dentry)
37 {
38 	struct sysfs_dirent * sd = dentry->d_fsdata;
39 	return ((struct kobject *) sd->s_element);
40 }
41 
42 static inline struct attribute * to_attr(struct dentry * dentry)
43 {
44 	struct sysfs_dirent * sd = dentry->d_fsdata;
45 	return ((struct attribute *) sd->s_element);
46 }
47 
48 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
49 {
50 	struct sysfs_dirent * sd = dentry->d_fsdata;
51 	return ((struct bin_attribute *) sd->s_element);
52 }
53 
54 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
55 {
56 	struct kobject * kobj = NULL;
57 
58 	spin_lock(&dcache_lock);
59 	if (!d_unhashed(dentry)) {
60 		struct sysfs_dirent * sd = dentry->d_fsdata;
61 		if (sd->s_type & SYSFS_KOBJ_LINK) {
62 			struct sysfs_symlink * sl = sd->s_element;
63 			kobj = kobject_get(sl->target_kobj);
64 		} else
65 			kobj = kobject_get(sd->s_element);
66 	}
67 	spin_unlock(&dcache_lock);
68 
69 	return kobj;
70 }
71 
72 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
73 {
74 	if (sd->s_type & SYSFS_KOBJ_LINK) {
75 		struct sysfs_symlink * sl = sd->s_element;
76 		kfree(sl->link_name);
77 		kobject_put(sl->target_kobj);
78 		kfree(sl);
79 	}
80 	kfree(sd->s_iattr);
81 	kmem_cache_free(sysfs_dir_cachep, sd);
82 }
83 
84 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
85 {
86 	if (sd) {
87 		WARN_ON(!atomic_read(&sd->s_count));
88 		atomic_inc(&sd->s_count);
89 	}
90 	return sd;
91 }
92 
93 static inline void sysfs_put(struct sysfs_dirent * sd)
94 {
95 	if (atomic_dec_and_test(&sd->s_count))
96 		release_sysfs_dirent(sd);
97 }
98 
99