ISO9660 4GB directory structures boundary limit and growisofs

[Julian H. Stacey]

Hi,
Paul B Mahol wrote:
> On 4/19/10, Paul B Mahol <onemda at gmail.com> wrote:
> > On 4/19/10, Tom Evans <tevans.uk at googlemail.com> wrote:
> >> On Mon, Apr 19, 2010 at 1:48 PM, Paul B Mahol <onemda at gmail.com> wrote:
> >>> On 4/17/10, Paul B Mahol <onemda at gmail.com> wrote:
> >>>> On Sat, Apr 17, 2010 at 4:31 PM, Tim Kientzle <kientzle at freebsd.org>
> >>>> wrote:
> >>>>> Paul B Mahol wrote:
> >>>>>>
> >>>>>> It is apparently not possible to make use of -use-the-force-luke=4gms
> >>>>>> on FreeBSD when appending new session after 4GB. Mounted disk
> >>>>>> afterwards  show nothing.
> >>>>>>
> >>>>>> Should we allow it like linux does?
> >>>>>
> >>>>> Are you claiming there is a problem when FreeBSD reads such
> >>>>> images or a problem with creating such images?  What
> >>>>> programs are you using?
> >>>>
> >>>> I burn flac files in multiple sessions, each session have separate
> >>>> directory, on DVD+R DL MKM/003
> >>>> After I used 4gms switch mounted fs shows nothing. (but there is >5GB
> >>>> of
> >>>> data)
> >>>>
> >>>> According to growisofs source BD (bluray) dont need this switch at all
> >>>> ...
> >>>>
> >>>>> This sounds like a pretty unsurprising 32-bit truncation
> >>>>> bug:  the filesystem structures in ISO9660 are all sector
> >>>>> numbers so 8TB should be the natural limit (4G sectors
> >>>>> times 2k bytes/sector).
> >>>>
> >>>> I did not tested this on FreeBSD amd64 yet.
> >>>
> >>> Update: Linux shows all sessions and Windows 7 shows only first one.
> >>
> >>
> >> From the source code of groisofs.c:
> >>
> >>  * - DVD+R Double Layer support;
> >>  * - -use-the-force-luke=4gms to allow ISO9660 directory structures
> >>  *   to cross 4GB boundary, the option is effective only with DVD+R DL
> >>  *   and for data to be accessible under Linux isofs a kernel patch is
> >>  *   required;
> >>
> >> So I'm guessing it does something non standard, particularly if
> >> windows also refuses to see the data.
> >
> > That is pretty old, from 2.4 era, it was added after it was found that
> > isofs had bug. Windows at least "try" to show something - only one
> > session, but fourth and not second session crossed 4GB limit.
> >
> > The source also claims that in BD case there is no need for _force_
> > switch at all.
> >
> 
> Mounting with -norrip shows all sessions.
> Kernel displays "RRIP without PX field?" if I try to mount "normal" way.

Might this help ?
Kernel config /sys/conf/NOTES
options         UDF                     #Universal Disk Format

My config notes
        /* Allows DVDs with files > 2 Gig, to avoid:
         *      "ls: file_about_2.5gig.ts:
         *       Value too large to be stored in data type"
         * ports/sysutils/k3b can use it to write eg 4G+ files.
         */

Cheers,
Julian
-- 
Julian Stacey: BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com
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