makefs(8) proposed changes [repost from fs@]

[Sean Bruno]

On Tue, 2013-10-15 at 10:04 -0700, John-Mark Gurney wrote:
> Sean Bruno wrote this message on Tue, Oct 15, 2013 at 09:07 -0700:
> > Is this patch going to break non "device" makefs calls?  e.g. if I want
> > to create an image file and not use a loopback device?
> 
> If the image file is zero bytes, then yes, it will break it... as the
> read will return a short value (possibly zero) ...  Why not add some
> error checking and if the read doesn't read enough, write the
> remaining bytes?  If there is a failure from the read, the operation
> should fail...
> 

yep, sounds good.  

does this "proof of concept" code seem to make sense to you?

sean
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