[LU-12325] Downgrade lock mode for DOM files when DOM bit gone

• Type: Improvement
• Resolution: Unresolved
• Priority: Major
• Labels: DoM2 IO500
• Assignee: Mikhail Pershin
• Reporter: Mikhail Pershin

Description

The DOM lock bit is taken opportunistically at open to improve possible read/write access but it uses PW lock mode and can be combined with other lock bits. The proposed improvements are:
1. when file is closed and there were no read/write, drop DOM bit and downgrade lock mode to less strict lock mode (CR/CW)
2. if there was write then write data on close (LU-11428) and also downgrade lock mode to PR
3. if DOM bit is dropped and there are other bits remains in lock - downgrade lock mode too

Issue Links

• is related to: LU-11428 Writeback on close for DoM