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tests/TC098-fragments-support.md

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+# Test Case: Packed-Inode Fragments
+
+**Test ID**: TC098-fragments-support  
+**Category**: Compression
+**Priority**: High
+
+## Objective
+
+Verify a deterministic whole-file fragment stored in the EROFS packed inode,
+including full and offset reads.  This is an in-image packed inode, not an
+external fragment device.
+
+## Fixture qualification
+
+Use fresh `fragment.erofs`.  The generator runs:
+
+```sh
+mkfs.erofs -T0 --all-time --all-root --workers=1 \
+  -U67360098-0000-0000-0000-000000000098 \
+  -zlz4 -C65536 -E all-fragments fragment.erofs sources/fragment
+```
+
+The manifest and verifier must report a nonzero packed NID, fragment feature,
+and compressed layout for `/fragment.dat`.  Host fsck extracts and compares the
+entire source before guest testing.
+
+## Manual procedure
+
+```sh
+I=/root/repo22-g6/images
+S=/root/repo22-g6/sources/fragment
+mkdir -p /mnt/g6
+kldload /root/repo22-g6/erofs.ko
+mdconfig -a -t vnode -f "$I/fragment.erofs" -u 90
+mount -t erofs -o ro /dev/md90 /mnt/g6
+stat -f '%z' /mnt/g6/fragment.dat
+sha256 "$S/fragment.dat" /mnt/g6/fragment.dat
+cmp "$S/fragment.dat" /mnt/g6/fragment.dat
+dd if="$S/fragment.dat" of=/tmp/tc098.src bs=1 skip=65536 count=8192 2>/dev/null
+dd if=/mnt/g6/fragment.dat of=/tmp/tc098.mnt bs=1 skip=65536 count=8192 2>/dev/null
+cmp /tmp/tc098.src /tmp/tc098.mnt
+```
+
+The size must be 100000 bytes, and all comparisons must pass.
+
+## Cleanup and zero-state check
+
+```sh
+umount /mnt/g6
+mdconfig -d -u 90
+kldunload erofs
+rm -f /tmp/tc098.src /tmp/tc098.mnt
+mount -p | awk '$3 == "erofs" { print }'
+mdconfig -l
+kldstat -n erofs 2>/dev/null || true
+sysctl -n kern.geom.conftxt | grep -E 'md90|erofs' || true
+```
+
+All four final outputs must be empty.