[vserver] dlimits/inodes_used problem with linux-image-vserver-3.18-beng

Hi there,

  I am currently testing the lastest linux-image-vserver-3.18-beng
vserver kernel on Debian jessie (that's linux-image-3.18.11-vs2.3.7.4-beng
0.1+jessie1).

  It seems there is a problem with inodes accounting : on a vserver guest
with dlimits enabled, inodes_used inside the guest goes up over time and
finally hits the inodes_total limit. Then of course things start to fail
with "no space left on device" error messages.
  At the same time, df -i on the host shows no such heavy inode usage
on the /vservers partition.

I can see such thing as :

<host> ~# vserver guest exec df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/hdv1 1000000 279341 720659 28% /
<host> ~# df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sda8 10993664 216732 10776932 2% /vservers

So more inodes appearing in use on a guest than are really
in use on the whole /vservers partition.

Stopping the guest and clearing /var/cache/vservers/guest/
restores the usage to normal values but then it starts
to increase anomalously again.
It looks like the inodes count is not decreased properly
in some circonstances.

-- 
 		Etienne Vogt (Etienne.Vogt@obspm.fr)
 		Observatoire de Paris-Meudon
 		Service Informatique