[Info-vax] Re; Spiralog, RMS Journaling (was Re: FREESPADRIFT)

[David Froble]

Johnny Billquist wrote:
> On 2016-06-19 04:35, David Froble wrote:
>> Jan-Erik Soderholm wrote:
> 
>>> Yes, but that is a simple calculation with 1 block = 512 bytes.
>>> It does not correctly display partially filled blocks. I guess
>>> that what most here are talking about is the size up to the
>>> marker. Convering the used/allocated number of blocks is simple.
>>>
>>> Jan-Erik.
>>
>> I would suggest "what does it matter?"
>>
>> It's not like some other file is going to use the unused portion of some
>> disk block, or, as suggested, unused part of 4096 bytes ....
> 
> No. But if you implement FTP, or a web server, or any number of other 
> tools/programs, they are expected to report file sizes in bytes, and the 
> byte count should be *accurate*. Even one byte off is not acceptable.
> And that becomes costly if your system do not keep that information, and 
> you have to calculate it yourself.
> 
>     Johnny
> 

I've done some communications in the past.  I usually use a handshake similar to:

Sender> Hey, I've got x bytes to send to you
Receiver> Ok, go ahead
Sender> sends string
Receiver> Ok, got x bytes

If any of the above goes South, then start over from the beginning

With timeouts, of course ..

So, yes, I understand.