1 struct sysfs_dirent { 2 atomic_t s_count; 3 struct list_head s_sibling; 4 struct list_head s_children; 5 void * s_element; 6 int s_type; 7 umode_t s_mode; 8 struct dentry * s_dentry; 9 struct iattr * s_iattr; 10 atomic_t s_event; 11 }; 12 13 extern struct vfsmount * sysfs_mount; 14 extern struct kmem_cache *sysfs_dir_cachep; 15 16 extern void sysfs_delete_inode(struct inode *inode); 17 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); 18 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); 19 20 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); 21 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, 22 umode_t, int); 23 24 extern int sysfs_add_file(struct dentry *, const struct attribute *, int); 25 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); 26 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 27 28 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); 29 extern void sysfs_remove_subdir(struct dentry *); 30 31 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd); 32 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent); 33 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 34 35 extern struct rw_semaphore sysfs_rename_sem; 36 extern struct super_block * sysfs_sb; 37 extern const struct file_operations sysfs_dir_operations; 38 extern const struct file_operations sysfs_file_operations; 39 extern const struct file_operations bin_fops; 40 extern const struct inode_operations sysfs_dir_inode_operations; 41 extern const struct inode_operations sysfs_symlink_inode_operations; 42 43 struct sysfs_symlink { 44 char * link_name; 45 struct kobject * target_kobj; 46 }; 47 48 struct sysfs_buffer { 49 struct list_head associates; 50 size_t count; 51 loff_t pos; 52 char * page; 53 struct sysfs_ops * ops; 54 struct semaphore sem; 55 int orphaned; 56 int needs_read_fill; 57 int event; 58 }; 59 60 struct sysfs_buffer_collection { 61 struct list_head associates; 62 }; 63 64 static inline struct kobject * to_kobj(struct dentry * dentry) 65 { 66 struct sysfs_dirent * sd = dentry->d_fsdata; 67 return ((struct kobject *) sd->s_element); 68 } 69 70 static inline struct attribute * to_attr(struct dentry * dentry) 71 { 72 struct sysfs_dirent * sd = dentry->d_fsdata; 73 return ((struct attribute *) sd->s_element); 74 } 75 76 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry) 77 { 78 struct sysfs_dirent * sd = dentry->d_fsdata; 79 return ((struct bin_attribute *) sd->s_element); 80 } 81 82 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry) 83 { 84 struct kobject * kobj = NULL; 85 86 spin_lock(&dcache_lock); 87 if (!d_unhashed(dentry)) { 88 struct sysfs_dirent * sd = dentry->d_fsdata; 89 if (sd->s_type & SYSFS_KOBJ_LINK) { 90 struct sysfs_symlink * sl = sd->s_element; 91 kobj = kobject_get(sl->target_kobj); 92 } else 93 kobj = kobject_get(sd->s_element); 94 } 95 spin_unlock(&dcache_lock); 96 97 return kobj; 98 } 99 100 static inline void release_sysfs_dirent(struct sysfs_dirent * sd) 101 { 102 if (sd->s_type & SYSFS_KOBJ_LINK) { 103 struct sysfs_symlink * sl = sd->s_element; 104 kfree(sl->link_name); 105 kobject_put(sl->target_kobj); 106 kfree(sl); 107 } 108 kfree(sd->s_iattr); 109 kmem_cache_free(sysfs_dir_cachep, sd); 110 } 111 112 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 113 { 114 if (sd) { 115 WARN_ON(!atomic_read(&sd->s_count)); 116 atomic_inc(&sd->s_count); 117 } 118 return sd; 119 } 120 121 static inline void sysfs_put(struct sysfs_dirent * sd) 122 { 123 if (atomic_dec_and_test(&sd->s_count)) 124 release_sysfs_dirent(sd); 125 } 126 127 static inline int sysfs_is_shadowed_inode(struct inode *inode) 128 { 129 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; 130 } 131