[LU-3162] lov_getstripe() makes incorrect assumptions about layout of lov_mds_md_v1

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.4.0
• Labels: lov
• Severity: 3
• Assignee: WC Triage
• Reporter: John Hammond

Description

The rarely tested lov_getstripe() assumes that

(char*)(&lmmk->lmm_stripe_count) + sizeof(lmmk->lmm_stripe_count)

is the address of lmm_objects when lmmk is cast to lov_mds_md_v1. (This was written before lmm_layout_gen was introduced. But this not the way to do that in any case.)