[v2 PATCH 0/6] IPVS: init and cleanup.

To: horms@xxxxxxxxxxxx, ja@xxxxxx, ebiederm@xxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx
Subject: [v2 PATCH 0/6] IPVS: init and cleanup.
Cc: hans.schillstrom@xxxxxxxxxxxx, Hans Schillstrom <hans@xxxxxxxxxxxxxxx>
From: Hans Schillstrom <hans@xxxxxxxxxxxxxxx>
Date: Wed, 20 Apr 2011 20:33:48 +0200
This patch series handles exit from a network name space.


This is version 2

Basically there was three faults in the netns implementation.
- Kernel threads hold devices and preventing an exit.
- dst cache holds references to devices.
- Services was not always released.

Patch 1 & 3 contains the functionality
      4 renames funcctions
      5 removes empty functions
      6 Debuging.

- Avoid to increment the usage counter for kernel threads.
  this is done in the first patch.
- Patch 3 tries to restore the cleanup order.
  Add NETDEV_UNREGISTER notification for dst_reset

>From Julian -
"For __ip_vs_service_cleanup: it still has to use mutex.
Or we can avoid it by introducing ip_vs_unlink_service_nolock:
ip_vs_flush will look like your __ip_vs_service_cleanup and
will call ip_vs_unlink_service_nolock. ip_vs_unlink_service_nolock
will be called by ip_vs_flush and by ip_vs_unlink_service."

I will give above another try later on see if I can get it to work.
Right now ip_vs_service_net_cleanup() seems to work.

An netns exit could look like this
IPVS: Enter: __ip_vs_dev_cleanup, net/netfilter/ipvs/ip_vs_core.c
IPVS: stopping master sync thread 1286 ...
IPVS: stopping backup sync thread 1294 ...
IPVS: Leave: __ip_vs_dev_cleanup, net/netfilter/ipvs/ip_vs_core.c
IPVS: Enter: ip_vs_dst_event, net/netfilter/ipvs/ip_vs_ctl.c line
IPVS: Leave: ip_vs_dst_event, net/netfilter/ipvs/ip_vs_ctl.c line
IPVS: Enter: ip_vs_dst_event, net/netfilter/ipvs/ip_vs_ctl.c line
IPVS: Leave: ip_vs_dst_event, net/netfilter/ipvs/ip_vs_ctl.c line
IPVS: Enter: ip_vs_service_net_cleanup, net/netfilter/ipvs/ip_vs_ctl.c
IPVS: __ip_vs_del_service: enter
IPVS: Moving dest into trash, dest->refcnt=43450
IPVS: Moving dest into trash, dest->refcnt=43449
IPVS: __ip_vs_del_service: enter
IPVS: Removing destination 0/[2003:0000:0000:0000:0000:0002:0000:0006]:80
IPVS: Removing destination 0/[2003:0000:0000:0000:0000:0002:0000:0003]:80
IPVS: Removing service 0/[2003:0000:0000:0000:0000:0002:0004:0100]:80 usecnt=0
IPVS: Leave: ip_vs_service_net_cleanup, net/netfilter/ipvs/ip_vs_ctl.c
IPVS: Enter: ip_vs_control_net_cleanup, net/netfilter/ipvs/ip_vs_ctl.c
IPVS: Removing service 80/ usecnt=0
IPVS: Leave: ip_vs_control_net_cleanup, net/netfilter/ipvs/ip_vs_ctl.c
IPVS: ipvs netns 8 released

This patch set is based upon net-next-2.6 (2.6.39-rc2)


 include/net/ip_vs.h              |   23 ++++--
 net/netfilter/ipvs/ip_vs_app.c   |   23 +-----
 net/netfilter/ipvs/ip_vs_conn.c  |   14 +---
 net/netfilter/ipvs/ip_vs_core.c  |  118 +++++++++++++++++++--------
 net/netfilter/ipvs/ip_vs_ctl.c   |  168 +++++++++++++++++++++++++++++++-------
 net/netfilter/ipvs/ip_vs_est.c   |   21 +----
 net/netfilter/ipvs/ip_vs_proto.c |   11 +--
 net/netfilter/ipvs/ip_vs_sync.c  |   70 ++++++++--------
 8 files changed, 281 insertions(+), 167 deletions(-)

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