test code v1

tests/TC054-vn-vget-ino.md

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+# 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.