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