| struct sysfs_open_dirent; |
| |
| /* type-specific structures for sysfs_dirent->s_* union members */ |
| struct sysfs_elem_dir { |
| struct kobject *kobj; |
| /* children list starts here and goes through sd->s_sibling */ |
| struct sysfs_dirent *children; |
| }; |
| |
| struct sysfs_elem_symlink { |
| struct sysfs_dirent *target_sd; |
| }; |
| |
| struct sysfs_elem_attr { |
| struct attribute *attr; |
| struct sysfs_open_dirent *open; |
| }; |
| |
| struct sysfs_elem_bin_attr { |
| struct bin_attribute *bin_attr; |
| }; |
| |
| /* |
| * sysfs_dirent - the building block of sysfs hierarchy. Each and |
| * every sysfs node is represented by single sysfs_dirent. |
| * |
| * As long as s_count reference is held, the sysfs_dirent itself is |
| * accessible. Dereferencing s_elem or any other outer entity |
| * requires s_active reference. |
| */ |
| struct sysfs_dirent { |
| atomic_t s_count; |
| atomic_t s_active; |
| struct sysfs_dirent *s_parent; |
| struct sysfs_dirent *s_sibling; |
| const char *s_name; |
| |
| union { |
| struct sysfs_elem_dir s_dir; |
| struct sysfs_elem_symlink s_symlink; |
| struct sysfs_elem_attr s_attr; |
| struct sysfs_elem_bin_attr s_bin_attr; |
| }; |
| |
| unsigned int s_flags; |
| ino_t s_ino; |
| umode_t s_mode; |
| struct iattr *s_iattr; |
| }; |
| |
| #define SD_DEACTIVATED_BIAS INT_MIN |
| |
| #define SYSFS_TYPE_MASK 0x00ff |
| #define SYSFS_DIR 0x0001 |
| #define SYSFS_KOBJ_ATTR 0x0002 |
| #define SYSFS_KOBJ_BIN_ATTR 0x0004 |
| #define SYSFS_KOBJ_LINK 0x0008 |
| #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
| |
| #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK |
| #define SYSFS_FLAG_REMOVED 0x0200 |
| |
| static inline unsigned int sysfs_type(struct sysfs_dirent *sd) |
| { |
| return sd->s_flags & SYSFS_TYPE_MASK; |
| } |
| |
| /* |
| * Context structure to be used while adding/removing nodes. |
| */ |
| struct sysfs_addrm_cxt { |
| struct sysfs_dirent *parent_sd; |
| struct inode *parent_inode; |
| struct sysfs_dirent *removed; |
| int cnt; |
| }; |
| |
| /* |
| * mount.c |
| */ |
| extern struct sysfs_dirent sysfs_root; |
| extern struct super_block *sysfs_sb; |
| extern struct kmem_cache *sysfs_dir_cachep; |
| |
| /* |
| * dir.c |
| */ |
| extern struct mutex sysfs_mutex; |
| extern struct mutex sysfs_rename_mutex; |
| extern spinlock_t sysfs_assoc_lock; |
| |
| extern const struct file_operations sysfs_dir_operations; |
| extern const struct inode_operations sysfs_dir_inode_operations; |
| |
| struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); |
| struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); |
| void sysfs_put_active(struct sysfs_dirent *sd); |
| struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); |
| void sysfs_put_active_two(struct sysfs_dirent *sd); |
| void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
| struct sysfs_dirent *parent_sd); |
| int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
| void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
| void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); |
| |
| struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
| const unsigned char *name); |
| struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
| const unsigned char *name); |
| struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); |
| |
| void release_sysfs_dirent(struct sysfs_dirent *sd); |
| |
| int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| struct sysfs_dirent **p_sd); |
| void sysfs_remove_subdir(struct sysfs_dirent *sd); |
| |
| static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd) |
| { |
| if (sd) { |
| WARN_ON(!atomic_read(&sd->s_count)); |
| atomic_inc(&sd->s_count); |
| } |
| return sd; |
| } |
| |
| static inline void sysfs_put(struct sysfs_dirent *sd) |
| { |
| if (sd && atomic_dec_and_test(&sd->s_count)) |
| release_sysfs_dirent(sd); |
| } |
| |
| /* |
| * inode.c |
| */ |
| struct inode *sysfs_get_inode(struct sysfs_dirent *sd); |
| int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); |
| int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); |
| |
| /* |
| * file.c |
| */ |
| extern const struct file_operations sysfs_file_operations; |
| |
| int sysfs_add_file(struct sysfs_dirent *dir_sd, |
| const struct attribute *attr, int type); |
| |
| /* |
| * bin.c |
| */ |
| extern const struct file_operations bin_fops; |
| |
| /* |
| * symlink.c |
| */ |
| extern const struct inode_operations sysfs_symlink_inode_operations; |