[LU-16538] Return PR or PW lock mode for OPEN ibits lock for DoM files

Thu, 16 Feb 2023 08:13:31 +0000

In the current Lustre, an OPEN ibits lock returned to a client is mandatorily setting to specific lock mode:
open mode lock mode

FMODE_WRITE CW
FMODE_EXEC PR
other CR

For DoM files, it would better to return the corresponding DOM ibits lock together (combined) with OPEN ibits to a client during the open() or open-ahead(https://jira.whamcloud.com/browse/LU-16429) for the possible subsequent read or write, which can reduce extra lock traffic for DOM ibits lock.

The client needs to handle for PW or PW OPEN ibits lock properly.

Whamcloud Community JIRA

[LU-16538] Return PR or PW lock mode for OPEN ibits lock for DoM files