1 struct sysfs_elem_dir { 2 struct kobject * kobj; 3 }; 4 5 struct sysfs_elem_symlink { 6 struct sysfs_dirent * target_sd; 7 }; 8 9 struct sysfs_elem_attr { 10 struct attribute * attr; 11 }; 12 13 struct sysfs_elem_bin_attr { 14 struct bin_attribute * bin_attr; 15 }; 16 17 /* 18 * As long as s_count reference is held, the sysfs_dirent itself is 19 * accessible. Dereferencing s_elem or any other outer entity 20 * requires s_active reference. 21 */ 22 struct sysfs_dirent { 23 atomic_t s_count; 24 atomic_t s_active; 25 struct sysfs_dirent * s_parent; 26 struct sysfs_dirent * s_sibling; 27 struct sysfs_dirent * s_children; 28 const char * s_name; 29 30 union { 31 struct sysfs_elem_dir dir; 32 struct sysfs_elem_symlink symlink; 33 struct sysfs_elem_attr attr; 34 struct sysfs_elem_bin_attr bin_attr; 35 } s_elem; 36 37 unsigned int s_flags; 38 umode_t s_mode; 39 ino_t s_ino; 40 struct dentry * s_dentry; 41 struct iattr * s_iattr; 42 atomic_t s_event; 43 }; 44 45 #define SD_DEACTIVATED_BIAS INT_MIN 46 47 extern struct vfsmount * sysfs_mount; 48 extern struct kmem_cache *sysfs_dir_cachep; 49 50 extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); 51 extern void sysfs_put_active(struct sysfs_dirent *sd); 52 extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); 53 extern void sysfs_put_active_two(struct sysfs_dirent *sd); 54 extern void sysfs_deactivate(struct sysfs_dirent *sd); 55 56 extern void sysfs_delete_inode(struct inode *inode); 57 extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode); 58 extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd); 59 extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode); 60 61 extern void release_sysfs_dirent(struct sysfs_dirent * sd); 62 extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, 63 const unsigned char *name); 64 extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, 65 const unsigned char *name); 66 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, 67 int type); 68 extern void sysfs_attach_dirent(struct sysfs_dirent *sd, 69 struct sysfs_dirent *parent_sd, 70 struct dentry *dentry); 71 72 extern int sysfs_add_file(struct sysfs_dirent *dir_sd, 73 const struct attribute *attr, int type); 74 extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); 75 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 76 77 extern int sysfs_create_subdir(struct kobject *kobj, const char *name, 78 struct sysfs_dirent **p_sd); 79 extern void sysfs_remove_subdir(struct sysfs_dirent *sd); 80 81 extern void sysfs_drop_dentry(struct sysfs_dirent *sd); 82 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 83 84 extern spinlock_t sysfs_assoc_lock; 85 extern struct rw_semaphore sysfs_rename_sem; 86 extern struct super_block * sysfs_sb; 87 extern const struct file_operations sysfs_dir_operations; 88 extern const struct file_operations sysfs_file_operations; 89 extern const struct file_operations bin_fops; 90 extern const struct inode_operations sysfs_dir_inode_operations; 91 extern const struct inode_operations sysfs_symlink_inode_operations; 92 93 static inline unsigned int sysfs_type(struct sysfs_dirent *sd) 94 { 95 return sd->s_flags & SYSFS_TYPE_MASK; 96 } 97 98 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 99 { 100 if (sd) { 101 WARN_ON(!atomic_read(&sd->s_count)); 102 atomic_inc(&sd->s_count); 103 } 104 return sd; 105 } 106 107 static inline void sysfs_put(struct sysfs_dirent * sd) 108 { 109 if (sd && atomic_dec_and_test(&sd->s_count)) 110 release_sysfs_dirent(sd); 111 } 112 113 static inline int sysfs_is_shadowed_inode(struct inode *inode) 114 { 115 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; 116 } 117