284     struct vfs_dir_entry_t *parent_dir = vfs_path_walk(buf, 0);  in vfs_mkdir()  local
286     if (parent_dir == NULL)  in vfs_mkdir()
301     spin_lock(&parent_dir->lockref.lock);  in vfs_mkdir()
312     subdir_dentry->parent = parent_dir;  in vfs_mkdir()
315     spin_lock(&parent_dir->dir_inode->lockref.lock);  in vfs_mkdir()
316     retval = parent_dir->dir_inode->inode_ops->mkdir(parent_dir->dir_inode, subdir_dentry, 0);  in vfs_mkdir()
317     spin_unlock(&parent_dir->dir_inode->lockref.lock);  in vfs_mkdir()
321         if (vfs_dentry_put(parent_dir) != 0) // 释放dentry  in vfs_mkdir()
322             spin_unlock(&parent_dir->lockref.lock);  in vfs_mkdir()
327     struct List *target_list = &parent_dir->subdirs_list;  in vfs_mkdir()
334         list_append(&parent_dir->subdirs_list, &subdir_dentry->child_node_list);  in vfs_mkdir()
340         list_append(&parent_dir->subdirs_list, &subdir_dentry->child_node_list);  in vfs_mkdir()
345     spin_unlock(&parent_dir->lockref.lock);  in vfs_mkdir()