per-container xattrs

Kernel RHEL5 028stab057.2 released
vzctl 3.0.22.

How to reproduce:

1. Creating VE:

# vzctl create 101
Creating VE private area (gentoo)
Performing postcreate actions
VE private area was created

# vzctl start 101
Starting VE ...
VE is mounted
Setting CPU limit: 25
Setting CPU units: 1000
Setting CPUs: 1
Configure meminfo: 65536
Setting quota ugidlimit: 1000
VE start in progress...

2. Creating file with "i" attribute inside VE:

# vzctl enter 101
entered into VE 101

101 / # touch /tmp/vzctl.test
101 / # chattr +i /tmp/vzctl.test
101 / # logout
exited from VE 101

3. Destroying VE:

# vzctl stop 101
Stopping VE ...
VE was stopped
VE is unmounted

# vzctl destroy 101
Destroying VE private area: /vz/private/101
VE private area was destroyed

4. Waiting 5 minutes and checking vztmp directory:

# ls /vz/vztmp/
rm.lck vzctl-rm-me.XHhn8L2

# ls /vz/vztmp/vzctl-rm-me.XHhn8L2
tmp

# ls /vz/vztmp/vzctl-rm-me.XHhn8L2/tmp/
vzctl.test

# ps awx | grep vzctl
17121 ? Ss 0:00 vzctl destroy 101

5. Removing "i" attribute:

# chattr -i /vz/vztmp/vzctl-rm-me.XHhn8L2/tmp/vzctl.test

6. Waiting 1 minute and checking vztmp directory:

# ls -l /vz/vztmp/
itogo 0