erofs-freebsd-out-tree/tests/TC103-deflate-level6.md

Test Case: DEFLATE Compression Level 6

Test ID: TC103-deflate-level6

G5 fixture contract: Use G5-MANUAL-SETUP.md. Its generated paths, source comparisons, structured corruption offsets, and cleanup rules supersede placeholder examples in this file. Category: Compression
Priority: High
Regression: None

Objective

Verify DEFLATE compressed data path with level 6 (default) compression.

Preconditions

• EROFS image created with DEFLATE level 6: mkfs.erofs -zdeflate,level=6 test.img src/
• Test files with various entropy levels
• FreeBSD 13.0+ with zlib support

Test Steps

1. Create image with DEFLATE level 6 compression
2. Attach and mount: unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt
3. Read text files, binaries, and random data
4. Verify all content matches original
5. Test partial reads at various offsets

Expected Results

• All files decompress correctly
• Better compression ratio than level 1
• Random access works at any offset
• Stable decompression performance

Verification Method

• SHA256 checksums match for all files
• Compression ratio >= level 1
• No decompression failures
• Random read correctness verified

Cleanup

umount /mnt
mdconfig -d -u "${unit}"

Notes

Tests feature 58: DEFLATE compressed data path with balanced compression.