[Dovecot] Maildir FS quota [was: Re: pre-1.0.rc27: Index and mbox fixes]

[Dan Price]

On Sun 11 Mar 2007 at 10:01PM, Timo Sirainen wrote:
> On Sun, 2007-03-11 at 21:45 +0200, Timo Sirainen wrote:
> > So the only problem is if the last uidlist rename() fails. But that I
> > hope won't fail because it's done inside the same directory, and the
> > maildir root directory is pretty static. 
> 
> /mnt/Maildir/tmp% mv 82 83
> mv: cannot move `82' to `83': No space left on device
> 
> /mnt/Maildir/tmp% mv 82 81
> /mnt/Maildir/tmp%

I think in general you can't depend upon this-- take for example any
filesystem supporting snapshots (like say ZFS).  ZFS counts the size of
your metadata against the quota (this is a good thing).  The size
occupied by your snapshot is also counted against the quota-- which means
that if you have /home/dp at yesterday and you are near the quota, a rename
of something which is in the snapshot will of course need to allocate
new data and/or metadata blocks, since the old state-of-the-world must
be saved in the snapshot.

        -dp

-- 
Daniel Price - Solaris Kernel Engineering - dp at eng.sun.com - blogs.sun.com/dp