[LU-8046] LFSCK does not properly check LOV_MAGIC

• Type: Bug
• Resolution: Not a Bug
• Priority: Major
• Affects Version/s: Lustre 2.6.0, Lustre 2.7.0, Lustre 2.8.0
• Labels: lfsck
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: Andreas Dilger

Description

In the LFSCK layout checking code, several places check for e.g. LOV_MAGIC_V1 and if this isn't found assume that the layout is LOV_MAGIC_V3. However, this will break when new layout types are added, like PFL, RAID-1, etc.

The LFSCK code should explicitly check the lmm_magic is a known value, and if it is not known either skip it (for magics matching LOV_MAGIC_MAGIC) or consider the layout to be corrupt (for magics that don't match LOV_MAGIC_MAGIC).