[LU-17612] Report Linux keyring error to user application

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Aurelien Degremont
• Reporter: Aurelien Degremont

Description

When a filesystem with a GSS Kerberos setup is facing Linux keyring related errors (Missing key, Key has been revoked or Key quota has been reached), returns that error to the application, to make that easier to understand.

In current code, this is all mask under Connetion refused, which makes it very difficult to understand the root cause of the I/O failure.