[LU-18895] FOFB hit a few cases of unlink() returning -EINVAL

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Shaun Tancheff

Description

unlink should not fail with -EINVAL

ll_unlink() should to return -ESTALE to trigger d_revalidate
instead of failing with -EINVAL.

debug code shows the origin of the -EINVAL at the client is coming from a failed req with rq_status = -EINVAL:

__x64_sys_unlink+0x23/0x30
 do_unlinkat+0x292/0x2f0
  vfs_unlink+0xf6/0x1d0
   ll_unlink+0x38b/0x7b0 [lustre]
    lmv_unlink+0x25c/0x760 [lmv]
     mdc_unlink+0x218/0x680 [mdc]
      mdc_reint+0x22/0xd0 [mdc]
       ptlrpc_queue_wait+0x86/0x240 [ptlrpc]
       ...
	rc = set->set_rc;
	list_for_each_entry(req, &set->set_requests, rq_set_chain) {
		LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
		if (req->rq_status != 0)
			rc = req->rq_status; <----- -EINVAL
	}
       ...