[LU-3314] failed to check ".lustre" for the MDT upgraded from Lustre-2.x (x <= 3)

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: LB fid
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: nasf (Inactive)

Description

For lustre-2.x (x <= 3), the ".lustre" object has NO FID-in-LMA, so the client will get IGIF for the ".lustre" object when the MDT restart. From the OI scrub view, when the MDT upgrade to Lustre-2.4, it does not know whether there are some alive clients have cached ".lustre" IGIF during the upgrading, so it has to generate IGIF-in-LMA and IGIF-in-OI for ".lustre" object. It will cause the others on the MDT failed to check "fid_is_dot_lustre()".

static inline int fid_is_dot_lustre(const struct lu_fid *fid)
{
        return unlikely(fid_seq(fid) == FID_SEQ_DOT_LUSTRE &&
                        fid_oid(fid) == FID_OID_DOT_LUSTRE);
}