Less available diskspace after crashed CLUSTER

Hi,

I was running a CLUSTER on a big database (approx. 8G) and I didn't
anticipate the diskspace usage, so I ran out of diskspace. This is on
PostgreSQL 7.4.6. The backend crashed with the following log messages:

2005-01-15 15:17:46 [30605] PANIC:  PANIC:  could not write to file
"/var/lib/pgsql/data/pg_xlog/xlogtemp.30605": Geen ruimte over op apparaat
STATEMENT:  CLUSTER;
2005-01-15 15:17:46 [11245] LOG:  server process (PID 30605) was terminated
by signal 6
2005-01-15 15:17:46 [11245] LOG:  terminating any other active server
processes
2005-01-15 15:17:46 [3378] WARNING:  terminating connection because of crash
of another server process
DETAIL:  The postmaster has commanded this server process to roll back the
current transaction and exit, because another server process exited
abnormally and possibly corrupted shared memory.
HINT:  In a moment you should be able to reconnect to the database and
repeat your command.
<... a lot more of the same messages from other backends ...>
2005-01-15 15:17:46 [11245] LOG:  all server processes terminated;
reinitializing
2005-01-15 15:17:46 [3389] LOG:  database system was interrupted at
2005-01-15 15:17:44 CET
2005-01-15 15:17:46 [3389] LOG:  checkpoint record is at 12/9E2976B0
2005-01-15 15:17:46 [3389] LOG:  redo record is at 12/9E00A790; undo record
is at 0/0; shutdown FALSE
2005-01-15 15:17:46 [3389] LOG:  next transaction ID: 13482165; next OID:
1694415
2005-01-15 15:17:46 [3389] LOG:  database system was not properly shut down;
automatic recovery in progress
2005-01-15 15:17:46 [3389] LOG:  redo starts at 12/9E00A790
2005-01-15 15:18:03 [3389] LOG:  could not open file
"/var/lib/pgsql/data/pg_xlog/00000012000000BF" (log file 18, segment 191):
Onbekend bestand of map
2005-01-15 15:18:03 [3389] LOG:  redo done at 12/BEFFD810
2005-01-15 15:18:13 [3389] LOG:  recycled transaction log file
"000000120000009B"
2005-01-15 15:18:13 [3389] LOG:  recycled transaction log file
"000000120000009C"
2005-01-15 15:18:13 [3389] LOG:  recycled transaction log file
"000000120000009D"
2005-01-15 15:18:13 [3389] LOG:  database system is ready

Translations:
 Geen ruimte over op apparaat -> No space left on device
 Onbekend bestand of map -> Unknown file or directory

The database is running nice again, but I have the feeling I lost some
diskspace... I suspected a temp file, so I stopped the postmaster, looked in
/var/lib/pgsql/data/base/17142/pgsql_tmp, found one file and deleted it. But
now I still have 1G less available diskspace than before the CLUSTER.

Where should I look next? I would like the diskspace back :-)

Thanks,
Sander.