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