[LU-7109] Update OST-index in IDIF inside osd-ldiskfs

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: nasf (Inactive)

Description

Old IDIF used "0" as the OST index, that may cause compatibility issues when update. There is switch inside osd-ldiskfs for controlling whether convert old IDIF to new one. Once the real OST index became part of the IDIF and stored on disk (in LMA EA), then the OST cannot be downgraded.

Because the conversion switch is inside osd-ldiskfs, the LFSCK should not update the IDIF-in-LMA, instead, leave it to be handled by OSD to avoid downgrading trouble.