60     pub fn callback_read(&self, buf: &mut [u8], offset: usize) -> Result<usize, SystemError> {  in callback_read()
65             if offset > 0 {  in callback_read()
66                 if len <= offset {  in callback_read()
69                 let len = len - offset;  in callback_read()
70                 buf.copy_within(offset..offset + len, 0);  in callback_read()
77             return bin_attribute.read(kobj, buf, offset);  in callback_read()
83     pub fn callback_write(&self, buf: &[u8], offset: usize) -> Result<usize, SystemError> {  in callback_write()
91             return bin_attribute.write(kobj, buf, offset);  in callback_write()
298         offset: usize,  in read()
300         return data.callback_read(buf, offset);  in read()
307         offset: usize,  in write()
309         return data.callback_write(buf, offset);  in write()
330         offset: usize,  in read()
332         return data.callback_read(buf, offset);  in read()
371         offset: usize,  in write()
373         return data.callback_write(buf, offset);  in write()