1 struct sysfs_dirent { 2 atomic_t s_count; 3 struct sysfs_dirent * s_parent; 4 struct list_head s_sibling; 5 struct list_head s_children; 6 const char * s_name; 7 void * s_element; 8 int s_type; 9 umode_t s_mode; 10 ino_t s_ino; 11 struct dentry * s_dentry; 12 struct iattr * s_iattr; 13 atomic_t s_event; 14 }; 15 16 extern struct vfsmount * sysfs_mount; 17 extern struct kmem_cache *sysfs_dir_cachep; 18 19 extern void sysfs_delete_inode(struct inode *inode); 20 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); 21 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); 22 23 extern void release_sysfs_dirent(struct sysfs_dirent * sd); 24 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); 25 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element, 26 umode_t mode, int type); 27 extern void sysfs_attach_dirent(struct sysfs_dirent *sd, 28 struct sysfs_dirent *parent_sd, 29 struct dentry *dentry); 30 31 extern int sysfs_add_file(struct dentry *, const struct attribute *, int); 32 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); 33 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 34 35 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); 36 extern void sysfs_remove_subdir(struct dentry *); 37 38 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent); 39 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 40 41 extern spinlock_t sysfs_lock; 42 extern struct rw_semaphore sysfs_rename_sem; 43 extern struct super_block * sysfs_sb; 44 extern const struct file_operations sysfs_dir_operations; 45 extern const struct file_operations sysfs_file_operations; 46 extern const struct file_operations bin_fops; 47 extern const struct inode_operations sysfs_dir_inode_operations; 48 extern const struct inode_operations sysfs_symlink_inode_operations; 49 50 struct sysfs_symlink { 51 struct kobject * target_kobj; 52 }; 53 54 struct sysfs_buffer { 55 struct list_head associates; 56 size_t count; 57 loff_t pos; 58 char * page; 59 struct sysfs_ops * ops; 60 struct semaphore sem; 61 int orphaned; 62 int needs_read_fill; 63 int event; 64 }; 65 66 struct sysfs_buffer_collection { 67 struct list_head associates; 68 }; 69 70 static inline struct kobject * to_kobj(struct dentry * dentry) 71 { 72 struct sysfs_dirent * sd = dentry->d_fsdata; 73 return ((struct kobject *) sd->s_element); 74 } 75 76 static inline struct attribute * to_attr(struct dentry * dentry) 77 { 78 struct sysfs_dirent * sd = dentry->d_fsdata; 79 return ((struct attribute *) sd->s_element); 80 } 81 82 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry) 83 { 84 struct sysfs_dirent * sd = dentry->d_fsdata; 85 return ((struct bin_attribute *) sd->s_element); 86 } 87 88 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry) 89 { 90 struct kobject * kobj = NULL; 91 92 spin_lock(&dcache_lock); 93 if (!d_unhashed(dentry)) { 94 struct sysfs_dirent * sd = dentry->d_fsdata; 95 if (sd->s_type & SYSFS_KOBJ_LINK) { 96 struct sysfs_symlink * sl = sd->s_element; 97 kobj = kobject_get(sl->target_kobj); 98 } else 99 kobj = kobject_get(sd->s_element); 100 } 101 spin_unlock(&dcache_lock); 102 103 return kobj; 104 } 105 106 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 107 { 108 if (sd) { 109 WARN_ON(!atomic_read(&sd->s_count)); 110 atomic_inc(&sd->s_count); 111 } 112 return sd; 113 } 114 115 static inline void sysfs_put(struct sysfs_dirent * sd) 116 { 117 if (sd && atomic_dec_and_test(&sd->s_count)) 118 release_sysfs_dirent(sd); 119 } 120 121 static inline int sysfs_is_shadowed_inode(struct inode *inode) 122 { 123 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; 124 } 125