Get cyrus-imap folder size without "du" tool

[Adam Tauno Williams]

On Thu, 2010-04-01 at 19:13 +0200, David Touzeau wrote:
> Joe Vieira wrote:
> > if they are all on one partition and nothing else is on that you could
> > just use df ....
> > On Thu, 2010-04-01 at 10:28 -0400, David Touzeau wrote:
> >> This problem occurs when you have more than 50Go mailboxes
> >> If you launch a "du -h -s /var/spool/cyrus/mail" the server load is on 
> >> top and I/O is at 100% for a long time.
> >> Is somebody have a tips to get the size status of all maiboxes without 
> >> using du tool even no quota is specified ?
> Thanks for the reply but the directory is not in a partition it is 
> stored on the master disk with the system.

"du" is essentially useless for Cyrus anyway since duplicate supression
and delayed expunge make "used disk space" kind of vague.  

If you just request the info for a mailbox it contains the mailboxes
size -

sardine.mormail.com> info user.adam
{user.adam}:
  condstore: true
  duplicatedeliver: false
  lastpop:  
  lastupdate:  1-Apr-2010 16:00:49 -0400
  partition: default
  pop3newuidl: true
  sharedseen: false
  size: 4276713

But I can't figure out how cyradm acquires that "size" value.  Every
script I see walks the mailbox and accumulates the message sizes, yet
cyradm seems to now instantly.   Is size available via an annotation?