[LU-20145] Invalidate LSOM in case of client eviction

• Type: Improvement
• Resolution: Unresolved
• Priority: Medium
• Affects Version/s: Lustre 2.18.0
• Labels: LSOM
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Sebastien Buisson

Description

In case of eviction, files opened on the client might have an out-dated LSOM attribute. To avoid falsely relying on this incorrect size estimate, it would be better to mark the LSOM attribute as invalid in this case. LSOM could be updated later at next open-write-close cycle, and in the meantime applications would need to stat the file to retrieve its actual size.