[LU-15855] Return -ENOKEY to encrypt-unaware clients if filename is missing

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.2
• Affects Version/s: Lustre 2.15.0
• Labels: encryption
• Severity: 3
• Assignee: Sebastien Buisson
• Reporter: Sebastien Buisson

Description

Applications that check for the existence of a file normally get -ENOENT when the filename does not exist.
To reduce issues with applications running on clients without keys or without fscrypt support that check for the existence of a file in an encrypted directory, we could return -ENOKEY in the case the filename is missing. That would at least catch applications that are looking for -ENOENT when trying to check if a file already exists.

Issue Links

• is related to: LU-13717 Client-side encryption - support file name encryption