dlm: Avoid LVB truncation

For lockspaces with an LVB length above 64 bytes, avoid truncating
the LVB while exchanging it with another node in the cluster.

Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: David Teigland <[e-mail]>

fs/dlm/lock.c

···
 	b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
 	if (b == 1) {
 		int len = receive_extralen(ms);
-		if (len > DLM_RESNAME_MAXLEN)
-			len = DLM_RESNAME_MAXLEN;
+		if (len > r->res_ls->ls_lvblen)
+			len = r->res_ls->ls_lvblen;
 		memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
 		lkb->lkb_lvbseq = ms->m_lvbseq;
 	}
···
 		if (!lkb->lkb_lvbptr)
 			return -ENOMEM;
 		len = receive_extralen(ms);
-		if (len > DLM_RESNAME_MAXLEN)
-			len = DLM_RESNAME_MAXLEN;
+		if (len > ls->ls_lvblen)
+			len = ls->ls_lvblen;
 		memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
 	}
 	return 0;