tree d201af832973088bc2d6c91d9b1ef68e7332f3da
parent 80ba92fa1a92dea128283f69f55b02242e213650
author Eric W. Biederman <ebiederm@xmission.com> 1431137228 -0500
committer David S. Miller <davem@davemloft.net> 1431355816 -0400

tun: Utilize the normal socket network namespace refcounting.

There is no need for tun to do the weird network namespace refcounting.
The existing network namespace refcounting in tfile has almost exactly
the same lifetime.  So rewrite the code to use the struct sock network
namespace refcounting and remove the unnecessary hand rolled network
namespace refcounting and the unncesary tfile->net.

This change allows the tun code to directly call sock_put bypassing
sock_release and making SOCK_EXTERNALLY_ALLOCATED unnecessary.

Remove the now unncessary tun_release so that if anything tries to use
the sock_release code path the kernel will oops, and let us know about
the bug.

The macvtap code already uses it's internal socket this way.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>