78         len: usize,  in read_at()
82         if buf.len() < len {  in read_at()
110         if len < inode.valid_cnt as usize {  in read_at()
111             end = (len + inode.read_pos as usize) % PIPE_BUFF_SIZE;  in read_at()
112             num = len;  in read_at()
145         metadata.size = inode.data.len() as i64;  in metadata()
157         len: usize,  in write_at()
161         if buf.len() < len || len > PIPE_BUFF_SIZE {  in write_at()
170         while len + inode.valid_cnt as usize > PIPE_BUFF_SIZE {  in write_at()
186         let end = (inode.write_pos as usize + len) % PIPE_BUFF_SIZE;  in write_at()
191             inode.data[0..end].copy_from_slice(&buf[(PIPE_BUFF_SIZE - start)..len]);  in write_at()
193             inode.data[start..end].copy_from_slice(&buf[0..len]);  in write_at()
196         inode.write_pos = (inode.write_pos + len as i32) % PIPE_BUFF_SIZE as i32;  in write_at()
197         inode.valid_cnt += len as i32;  in write_at()
202         return Ok(len);  in write_at()