[LU-9672] gss: fix expiration time of sunrpc cache

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.2
• Affects Version/s: Lustre 2.9.0
• Labels: gss patch
• Severity: 3
• Assignee: Sebastien Buisson (Inactive)
• Reporter: Sebastien Buisson (Inactive)

Description

Expiration time of sunrpc cache, used for communications between kernel space and user space for GSS credentials negotiation on server side, is misinterpreted.
Downcall and response from user space must provide an epoch time, not a duration. And on kernel side, expiry must always be counted as seconds from boot, as set when retrieved from get_expiry().