[LU-4012] GSS upcall routine fails due to removed generic cache routines in Linux kernels >= 3.4.X

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.6.0
• Affects Version/s: Lustre 2.5.0
• Labels: gssapi kerberos patch
• Environment: Debian Wheezy with Lustre Patched Kernel 3.6.11
• Severity: 3
• Assignee: Nathaniel Clark
• Reporter: Thomas Stibor

Description

With Linux kernel version >= 3.4.X the generic cache registering
routines cache_register(), cache_unregister() are removed.
This effects the GSS upcall routines for the Kerberos
support in Lustre. Before (Linux kernel <= 3.2.X) the
generic routines were coded as:

int cache_register(struct cache_detail *cd)
{
        return cache_register_net(cd, &init_net);
}
void cache_unregister(struct cache_detail *cd)
{
        cache_unregister_net(cd, &init_net);
}

To keep compatibility with former kernel versions,
cache_register_net() and cache_unregister_net() can
be applied instead, rather than the old and
removed cache_register() and cache_unregister().

I provide a patch to fix it.