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 ino_t s_ino; 9 struct dentry * s_dentry; 10 struct iattr * s_iattr; 11 atomic_t s_event; 12 }; 13 14 extern struct vfsmount * sysfs_mount; 15 extern struct kmem_cache *sysfs_dir_cachep; 16 17 extern void sysfs_delete_inode(struct inode *inode); 18 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); 19 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); 20 21 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); 22 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, 23 umode_t, int); 24 25 extern int sysfs_add_file(struct dentry *, const struct attribute *, int); 26 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); 27 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 28 29 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); 30 extern void sysfs_remove_subdir(struct dentry *); 31 32 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd); 33 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent); 34 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 35 36 extern spinlock_t sysfs_lock; 37 extern struct rw_semaphore sysfs_rename_sem; 38 extern struct super_block * sysfs_sb; 39 extern const struct file_operations sysfs_dir_operations; 40 extern const struct file_operations sysfs_file_operations; 41 extern const struct file_operations bin_fops; 42 extern const struct inode_operations sysfs_dir_inode_operations; 43 extern const struct inode_operations sysfs_symlink_inode_operations; 44 45 struct sysfs_symlink { 46 char * link_name; 47 struct kobject * target_kobj; 48 }; 49 50 struct sysfs_buffer { 51 struct list_head associates; 52 size_t count; 53 loff_t pos; 54 char * page; 55 struct sysfs_ops * ops; 56 struct semaphore sem; 57 int orphaned; 58 int needs_read_fill; 59 int event; 60 }; 61 62 struct sysfs_buffer_collection { 63 struct list_head associates; 64 }; 65 66 static inline struct kobject * to_kobj(struct dentry * dentry) 67 { 68 struct sysfs_dirent * sd = dentry->d_fsdata; 69 return ((struct kobject *) sd->s_element); 70 } 71 72 static inline struct attribute * to_attr(struct dentry * dentry) 73 { 74 struct sysfs_dirent * sd = dentry->d_fsdata; 75 return ((struct attribute *) sd->s_element); 76 } 77 78 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry) 79 { 80 struct sysfs_dirent * sd = dentry->d_fsdata; 81 return ((struct bin_attribute *) sd->s_element); 82 } 83 84 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry) 85 { 86 struct kobject * kobj = NULL; 87 88 spin_lock(&dcache_lock); 89 if (!d_unhashed(dentry)) { 90 struct sysfs_dirent * sd = dentry->d_fsdata; 91 if (sd->s_type & SYSFS_KOBJ_LINK) { 92 struct sysfs_symlink * sl = sd->s_element; 93 kobj = kobject_get(sl->target_kobj); 94 } else 95 kobj = kobject_get(sd->s_element); 96 } 97 spin_unlock(&dcache_lock); 98 99 return kobj; 100 } 101 102 static inline void release_sysfs_dirent(struct sysfs_dirent * sd) 103 { 104 if (sd->s_type & SYSFS_KOBJ_LINK) { 105 struct sysfs_symlink * sl = sd->s_element; 106 kfree(sl->link_name); 107 kobject_put(sl->target_kobj); 108 kfree(sl); 109 } 110 kfree(sd->s_iattr); 111 kmem_cache_free(sysfs_dir_cachep, sd); 112 } 113 114 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 115 { 116 if (sd) { 117 WARN_ON(!atomic_read(&sd->s_count)); 118 atomic_inc(&sd->s_count); 119 } 120 return sd; 121 } 122 123 static inline void sysfs_put(struct sysfs_dirent * sd) 124 { 125 if (atomic_dec_and_test(&sd->s_count)) 126 release_sysfs_dirent(sd); 127 } 128 129 static inline int sysfs_is_shadowed_inode(struct inode *inode) 130 { 131 return S_ISDIR(inode->i_mode) && inode->i_op->follow_link; 132 } 133