[imp] VFS files mystery

[AJ]

Hi all, I have been looking through the source code to try to find out 
where these files are coming from, but I can't seem to find the source.
Here is a snippet of /tmp
-rw-------    1 www      www             0 Jul 29 19:50 vfs40s7br
-rw-------    1 www      www             0 Jul 29 19:38 vfs5Z1Ju1
-rw-------    1 www      www             0 Jul 29 19:50 vfs6X6Vi0
-rw-------    1 www      www             0 Jul 29 19:38 vfsGo6doB
-rw-------    1 www      www             0 Jul 31 10:23 vfsIxkoVe
-rw-------    1 www      www             0 Aug  3 15:56 vfsJtgTSS
-rw-------    1 www      www             0 Jul 30 08:47 vfskExkv3
-rw-------    1 www      www             0 Jul 31 10:23 vfskxPSS2
-rw-------    1 www      www             0 Aug  3 15:56 vfsLGOQ0j
-rw-------    1 www      www             0 Jul 29 19:50 vfsNOrOAN
-rw-------    1 www      www             0 Jul 29 19:50 vfsNtE6Jd
-rw-------    1 www      www             0 Jul 29 19:50 vfsOcf2It
-rw-------    1 www      www             0 Jul 27 12:16 vfsPd7ql4
-rw-------    1 www      www             0 Jul 29 19:50 vfsSZpbuR
-rw-------    1 www      www             0 Jul 27 12:16 vfsVg5Lj8
-rw-------    1 www      www             0 Jul 30 08:47 vfszGOilf

I have setup a file based vfs to a directory other than /tmp, but these 
files still seem to wind up here.
Can anyone tell me what these files are and if it is possible to have them 
go to the configured vfs file directory rather than /tmp


As always,
Thanks.

AJ