Re: kern/48787

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR kern/48787; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: Wolfgang Solfrank <Wolfgang%Solfrank.net@localhost>, scdbackup%gmx.net@localhost
Subject: Re: kern/48787
Date: Sun, 5 Jul 2015 16:34:14 +0000

 On Wed, May 21, 2014 at 11:25:01PM +0000, Wolfgang Solfrank wrote:
  >  Be my guest.  However, this will be a larger project than just
  >  updating code in cd9660.  The problem is that an extent (as you
  >  indicate above) ist a "byte interval ... of the overall file".  What this
  >  means is that you can have a file with a first extent of, say, 3 bytes
  >  and a second one of 5 bytes and so on (which looks absurd when
  >  you first look at it, but does make sense if you think about multi-
  >  session cds where you e.g. extend some logfile in a later session.)
  >  The buffer cache in its current implementation doesn't support
  >  this.kind of fragmentation.
 
 For the record, I don't think this should require any more than a
 custom getpages method. Mind you, that's not trivial.
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost