https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190655
Bug ID: 190655
Summary: cd9660 cannot mount ISO 9660 multi-session above 4 GiB
Product: Base System
Version: 8.4-STABLE
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: Normal
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: scdbac...@gmx.net
This bug shows up when mounting a multi-session ISO 9660 medium
which has its directory tree above 4 GiB. (Not possible with CD,
but with DVD or BD.)
Obtain und uncompress
http://scdbackup.webframe.org/large.iso.bz2
(Caution: 4470 bytes inflate to 4+ GiB.)
Then mount it
# mdconfig -a -t vnode -f large.iso
md1
# mount_cd9660 /dev/md1 /mnt
# find /mnt
/mnt
# ls -ld /mnt
-r-xr-xr-x 1 root wheel 0 Jan 1 1970 /mnt
The reason is that the byte address of the ISO 9660 Directory Records
is encoded in ino_t, which on FreeBSD is 32 bit. If a record is stored
above 4 GiB - 1, then rollover happens and it cannot be found.
By webinterface i believe to see it in current FreeBSD source, too.
The rollover in function isodirino():
http://fxr.watson.org/fxr/source/fs/cd9660/cd9660_node.c?v=FREEBSD10#L319
The reverse computation of the directory block address
http://fxr.watson.org/fxr/source/fs/cd9660/cd9660_vfsops.c?v=FREEBSD10#L773
The reverse computation of the byte address of the directory
record of a symbolic link target
http://fxr.watson.org/fxr/source/fs/cd9660/cd9660_vnops.c?v=FREEBSD10#L692
And the reason why the NetBSD remedy will not help FreeBSD
http://fxr.watson.org/fxr/source/sys/_types.h?v=FREEBSD10;im=3#L46
At least on my olde FreeBSD-8.4, sizeof(ino_t) is really 4.
See also
http://lists.freebsd.org/pipermail/freebsd-hackers/2014-May/045139.html
For my diagnosis and solution which cannot be ported to FreeBSD
http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=48787
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