Line-accurate confirmation only (proportionate for Info tier):
sys/kern/vfs_jops.c:477-478  if (info->index < index) continue;
Requesting journal status for index k emits records for journals 0..k
(skip only fires when k < position). Intent per FreeBSD gjournal-style
status is exact-index match. Root-only mountctl path, buflen-guarded
(each record checked against remaining buflen at :482), no memory
safety impact. Mechanical demo skipped: requires configuring a live
mount journal (mountctl) disproportionate to Info tier.