test code v1

2026-08-13 10:44:59 +02:00
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+# 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
+
+```sh
+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
+
+```sh
+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.