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 struct sysfs_addrm_cxt { 48 struct sysfs_dirent *parent_sd; 49 struct inode *parent_inode; 50 struct sysfs_dirent *removed; 51 int cnt; 52 }; 53 54 extern struct vfsmount * sysfs_mount; 55 extern struct sysfs_dirent sysfs_root; 56 extern struct kmem_cache *sysfs_dir_cachep; 57 58 extern struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); 59 extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); 60 extern void sysfs_put_active(struct sysfs_dirent *sd); 61 extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); 62 extern void sysfs_put_active_two(struct sysfs_dirent *sd); 63 extern void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, 64 struct sysfs_dirent *parent_sd); 65 extern int sysfs_add_one(struct sysfs_addrm_cxt *acxt, 66 struct sysfs_dirent *sd); 67 extern void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, 68 struct sysfs_dirent *sd); 69 extern void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); 70 71 extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd); 72 extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode); 73 74 extern void release_sysfs_dirent(struct sysfs_dirent * sd); 75 extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, 76 const unsigned char *name); 77 extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, 78 const unsigned char *name); 79 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, 80 int type); 81 82 extern int sysfs_add_file(struct sysfs_dirent *dir_sd, 83 const struct attribute *attr, int type); 84 extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); 85 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 86 87 extern int sysfs_create_subdir(struct kobject *kobj, const char *name, 88 struct sysfs_dirent **p_sd); 89 extern void sysfs_remove_subdir(struct sysfs_dirent *sd); 90 91 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 92 93 extern spinlock_t sysfs_assoc_lock; 94 extern struct mutex sysfs_mutex; 95 extern struct super_block * sysfs_sb; 96 extern const struct file_operations sysfs_dir_operations; 97 extern const struct file_operations sysfs_file_operations; 98 extern const struct file_operations bin_fops; 99 extern const struct inode_operations sysfs_dir_inode_operations; 100 extern const struct inode_operations sysfs_symlink_inode_operations; 101 102 static inline unsigned int sysfs_type(struct sysfs_dirent *sd) 103 { 104 return sd->s_flags & SYSFS_TYPE_MASK; 105 } 106 107 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 108 { 109 if (sd) { 110 WARN_ON(!atomic_read(&sd->s_count)); 111 atomic_inc(&sd->s_count); 112 } 113 return sd; 114 } 115 116 static inline void sysfs_put(struct sysfs_dirent * sd) 117 { 118 if (sd && atomic_dec_and_test(&sd->s_count)) 119 release_sysfs_dirent(sd); 120 } 121