# 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.
