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2026-08-18 09:20:44 +02:00
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+# Test Case: Superblock Parsing
+
+**Test ID**: TC014-superblock-parse
+
+## Objective
+
+Verify mandatory superblock fields at their real on-disk offsets and compare
+the mounted values exposed by FreeBSD.
+
+## Fixture
+
+Use `images/compact.erofs`, its image hash, `fixture-evidence.txt`, and
+`tests/statfs_probe.c`.
+
+## Procedure
+
+Host inspection:
+
+```sh
+od -An -tx4 -j 1024 -N 4 /work/build/repo22-g1/images/compact.erofs
+od -An -tu1 -j 1036 -N 1 /work/build/repo22-g1/images/compact.erofs
+od -An -tu2 -j 1038 -N 2 /work/build/repo22-g1/images/compact.erofs
+od -An -tu8 -j 1040 -N 8 /work/build/repo22-g1/images/compact.erofs
+od -An -tu4 -j 1060 -N 8 /work/build/repo22-g1/images/compact.erofs
+dump.erofs -s /work/build/repo22-g1/images/compact.erofs
+python3 tests/erofs_fixture.py inspect /work/build/repo22-g1/images/compact.erofs
+```
+
+Mount the same hashed image in FreeBSD, then run:
+
+```sh
+./statfs_probe "$mnt"
+stat -f 'root_ino=%i type=%HT' "$mnt"
+mount -p | awk -v p="$mnt" '$2 == p'
+```
+
+## Expected Results
+
+- Magic is `0xe0f5e1e2`, `blkszbits=12`, and checksum validation is true.
+- Root NID, block count, and inode count agree with root `stat` and
+  `statfs_probe`; filesystem type is `erofs` and read-only.
+- No parser error appears in the dmesg delta; cleanup succeeds.