Date: Tue, 27 Apr 2010 21:18:56 +0000 From: Paul B Mahol <onemda@gmail.com> To: Tom Evans <tevans.uk@googlemail.com> Cc: Tim Kientzle <kientzle@freebsd.org>, current@freebsd.org, fs@freebsd.org Subject: Re: ISO9660 4GB directory structures boundary limit and growisofs Message-ID: <g2l3a142e751004271418l6bc9baa8v23aff2692a4966b0@mail.gmail.com> In-Reply-To: <p2p3a142e751004190818qfee3cbc8zea27f73e5a883d74@mail.gmail.com> References: <p2l3a142e751004161607h5ea399e3p182f3c6b10fc9346@mail.gmail.com> <4BC9E254.9070300@freebsd.org> <j2j3a142e751004171011l6fda3f45n8e958ab372b200a7@mail.gmail.com> <t2o3a142e751004190548r39b2c718vde92fb5e10db1062@mail.gmail.com> <w2k2e027be01004190710k877314fdv384fab009cef1e9b@mail.gmail.com> <p2p3a142e751004190818qfee3cbc8zea27f73e5a883d74@mail.gmail.com>
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On 4/19/10, Paul B Mahol <onemda@gmail.com> wrote: > On 4/19/10, Tom Evans <tevans.uk@googlemail.com> wrote: >> On Mon, Apr 19, 2010 at 1:48 PM, Paul B Mahol <onemda@gmail.com> wrote: >>> On 4/17/10, Paul B Mahol <onemda@gmail.com> wrote: >>>> On Sat, Apr 17, 2010 at 4:31 PM, Tim Kientzle <kientzle@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.
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