Test Case: Real Multi-Device Chunk Read

Test ID: TC006-multidev-chunk-read
Category: Multi-Device / Chunk-Based Priority: Critical

Objective

Prove that 8-byte chunk indexes read file data from a live external GEOM provider, including a range crossing a chunk boundary.

Fixture

Generate and verify the fresh G6 set as described in G6-MANUAL-SETUP.md. Use mkfs-blob-primary.erofs and mkfs-blob-slot1.blob. The manifest must show primary blocks 1, slot-1 blocks 224, and every /tc006.bin index as device ID 1. The 4096-byte primary cannot contain the 98304-byte source.

Manual procedure

I=/root/repo22-g6/images
S=/root/repo22-g6/sources/chunk
mkdir -p /mnt/g6
kldload /root/repo22-g6/erofs.ko
mdconfig -a -t vnode -f "$I/mkfs-blob-primary.erofs" -u 90
mdconfig -a -t vnode -f "$I/mkfs-blob-slot1.blob" -u 91
mount -t erofs -o ro -o device.1=/dev/md91 /dev/md90 /mnt/g6
sha256 "$S/tc006.bin" /mnt/g6/tc006.bin
cmp "$S/tc006.bin" /mnt/g6/tc006.bin
dd if="$S/tc006.bin" of=/tmp/tc006.expected bs=1 skip=28672 count=8192 2>/dev/null
dd if=/mnt/g6/tc006.bin of=/tmp/tc006.actual bs=1 skip=28672 count=8192 2>/dev/null
cmp /tmp/tc006.expected /tmp/tc006.actual
truss -f -o /tmp/tc006-ebusy.truss mdconfig -d -u 91
tail -20 /tmp/tc006-ebusy.truss
sysctl -n kern.geom.conftxt | grep -A8 -B2 'Geom name: md91'

The detach must fail with EBUSY, proving a live external consumer.

Expected results

Mount, full-file cmp, SHA256, and the 8192-byte cross-boundary range pass.
The external detach returns exactly EBUSY while mounted.
No panic, trap, hang, or unexpected EROFS dmesg message occurs.

Cleanup and zero-state check

umount /mnt/g6
mdconfig -d -u 91
mdconfig -d -u 90
kldunload erofs
rm -f /tmp/tc006.expected /tmp/tc006.actual
mount -p | awk '$3 == "erofs" { print }'
mdconfig -l
kldstat -n erofs 2>/dev/null || true
sysctl -n kern.geom.conftxt | grep -E 'md9[01]|erofs' || true

All four final outputs must be empty.

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