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