# Test Case: Parent Vnode Lookup Behavior

**Test ID**: TC054-vn-vget-ino
**Category**: VFS Integration
**Priority**: High

## Objective

Verify repeated dotdot lookups return the correct stable parent vnode without
deadlock. This is behavior-level coverage of the vn_vget_ino path; userspace
cannot prove the internal helper call by timing.

## Procedure

Mount vfs/vfs-plain.erofs and run:

    stat -f 'ino=%i gen=%v type=%HT' \
      /tmp/repo22-g3/mnt/parent > TC054-parent.txt
    stat -f 'ino=%i gen=%v type=%HT' \
      /tmp/repo22-g3/mnt/parent/child/.. > TC054-dotdot1.txt
    stat -f 'ino=%i gen=%v type=%HT' \
      /tmp/repo22-g3/mnt/parent/child/.. > TC054-dotdot2.txt
    cmp TC054-parent.txt TC054-dotdot1.txt
    cmp TC054-dotdot1.txt TC054-dotdot2.txt

## Expected Results

All commands complete, metadata is identical, and dmesg has no lock-order,
trap, or panic report. Record behavior and cleanup without claiming direct
internal instrumentation.