[Dovecot] AIX: mntctl implementation for NFS quota support

[Timo Sirainen]

On Sun, 2008-07-06 at 18:41 +0200, Ralf Becker wrote:
> Hi Timo,
> 
> I've added support for a static mtab buffer.
> 
> Unfortunately 256 Bytes are too small by far. In my case the required 
> space is about 3 KByte. To avoid unnecessary memory allocation the 
> static size is determined at configuration time by getting the current 
> buffer size and adding space for about 5 mountpoints more. In addition 
> 'configure' now checks for sys/vmount.h

Committed with a few changes, could you try if it still works? :)
http://hg.dovecot.org/dovecot-1.1/rev/ecc57955b99d

 - Some small coding style changes to make it more consistent with rest
of Dovecot code
 - Handle mntctl() returning failure
 - Instead of just one mntctl() retry I added a while-loop. The required
allocation size can change if more mounts are added, right? So there's
otherwise a small race condition between the size checking and the
actual allocation that could cause an unwanted failure. And I think it's
pretty safe to assume that the kernel won't return values that will
cause infinite looping. :)

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