title: Where in the DB is the Location of a postgres tablespace stored
body: <p>I am using postgres 9.2 on redhat 6 </p>
  
  <p>this should be simple but I can't find it anywhere. I am looking for the database table and column which stores the Location for a postgres tablespace, I thought it would be in PG_TABLESPACE, but </p>
  
  <pre><code>select * from pg_tablespace
  </code></pre>
  
  <p>shows...</p>
  
  <pre><code>postgres=# select * from pg_tablespace;
       spcname     | spcowner | spcacl | spcoptions
  -----------------+----------+--------+------------
   pg_default      |       10 |        |
   pg_global       |       10 |        |
   C_TBL_DB91SABIR |       10 |        |
  (3 rows)
  </code></pre>
  
  <p>but no location, any ideas where the location is kept?</p>
  
  <p>thanks</p>