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