[LU-16649] EIO is possible on race with page reclaim/deletion

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.3
• Severity: 3
• Assignee: Patrick Farrell
• Reporter: Patrick Farrell

Description

Careful examination shows that it's possible for the bug fixed for mmap in https://review.whamcloud.com/49647 can also occur in the standard read() path.

This means unless we can figure out a more graceful way to handle our page deletion, we need the same check and retry code in the normal read() path as we have in the page fault path.