[LU-3489] ZFS OSD missing OI iterator for scrub/LFSCK

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.6.0, Lustre 2.5.4
• Affects Version/s: Lustre 2.4.0, Lustre 2.5.0
• Labels: mq414 prz zfs
• Assignee: Alex Zhuravlev
• Reporter: Andreas Dilger

Description

There is not yet an object table iterator for ZFS OSDs. This is needed in order to implement OI Scrub for ZFS (which would also allow a file-level backup of an ldiskfs-based MDT/OST to be restored into a newly-formatted ZFS filesystem) and verifying the Lustre namespace metadata (e.g. linkEA and FID-in-dirent).

It is also needed for implementing the distributed MDT-OST verification for LFSCK Phase II, and MDT-MDT verification for DNE in LFSCK Phase III.