[LU-18679] Allow setting an "immutable inherit" flag on a directory

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Affects Version/s: Lustre 2.17.0
• Labels: easy medium
• Severity: 3
• Assignee: WC Triage
• Reporter: Andreas Dilger

Description

It should be possible to set an "immutable inherit" or "immutable on close" flag on a parent directory that results in the FS_IMMUTABLE_FL to be set on all new files created in that directory after it is closed by the last client.

There is already some delay between the application close on the client, and when the close is sent to the MDS, so this should avoid issues with files being opened and closed briefly after creation, but this should be tested.

Issue Links

• is related to: LU-17957 set immutable with "future atime + chmod a-w"