df fooled by multitrack CDROM

[Dan Jacobson]

The du and df commands give differing results. Perhaps df can't see
into multitrack CDROMs.

address@hidden:~$ df /cdrom
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/cdrom                9044      9044         0 100% /cdrom
address@hidden:~$ du /cdrom
63146   /cdrom/second_dir
78759   /cdrom
address@hidden:~$ df -B 1 /cdrom
Filesystem           1B-blocks      Used Available Use% Mounted on
/dev/cdrom             9261056   9261056         0 100% /cdrom
address@hidden:~$ du -B 1 /cdrom
64661504        /cdrom/second_dir
80649216        /cdrom
address@hidden:~$ du -s -B 1 /cdrom
80649216        /cdrom
address@hidden:~$ du -a -B 1 /cdrom
15985664        /cdrom/bkp20010619054002.cpio.bz2
8962560 /cdrom/second_dir/bkp20020112154821.cpio.bz2
14219776        /cdrom/second_dir/bkp20011025111055.cpio.bz2
9545728 /cdrom/second_dir/bkp20020405105743.cpio.bz2
1433600 /cdrom/second_dir/dan_home_bkp5024.bz2
2570752 /cdrom/second_dir/dan_home_bkp2002-10-13-12-31-46.bz2
3026944 /cdrom/second_dir/dan_home_bkp2002-11-29-10-31-08.bz2
3736064 /cdrom/second_dir/dan_home_bkp2003-01-08-02-21-48.bz2
5192192 /cdrom/second_dir/dan_home_bkp2003-03-07-09-57-26.bz2
6240768 /cdrom/second_dir/dan_home_bkp2003-04-27-13-36-50.bz2
8902144 /cdrom/second_dir/dan_home_bkp2003-06-30-12-51-47.bz2
49152   /cdrom/second_dir/etc_bkp2002-10-13-12-36-26.bz2
51200   /cdrom/second_dir/etc_bkp2002-11-29-10-32-24.bz2
55808   /cdrom/second_dir/etc_bkp2003-01-08-02-25-07.bz2
55296   /cdrom/second_dir/etc_bkp2003-03-07-10-00-53.bz2
56320   /cdrom/second_dir/etc_bkp2003-04-27-13-38-45.bz2
60416   /cdrom/second_dir/etc_bkp2003-06-30-12-53-22.bz2
46080   /cdrom/second_dir/etc_bkp5033.bz2
20992   /cdrom/second_dir/root_bkp5033.bz2
38400   /cdrom/second_dir/root_bkp2002-10-13-12-36-26.bz2
52224   /cdrom/second_dir/root_bkp2002-11-29-10-32-24.bz2
55296   /cdrom/second_dir/root_bkp2003-01-08-02-25-07.bz2
44544   /cdrom/second_dir/root_bkp2003-03-07-10-00-53.bz2
59904   /cdrom/second_dir/root_bkp2003-04-27-13-38-45.bz2
181248  /cdrom/second_dir/root_bkp2003-06-30-12-53-22.bz2
64661504        /cdrom/second_dir
80649216        /cdrom