erofs-freebsd-out-tree/tests/TC014-superblock-parse.md

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:

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:

./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.