Date: Thu, 05 Jun 2014 11:44:30 +0000 From: bz-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 190655] New: cd9660 cannot mount ISO 9660 multi-session above 4 GiB Message-ID: <bug-190655-8@https.bugs.freebsd.org/bugzilla/>
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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: scdbackup@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 -- You are receiving this mail because: You are the assignee for the bug.help
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