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2026-08-18 09:20:44 +02:00
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+# Test Case: Chunk Indexes and Compressed Pcluster on External Slots
+
+**Test ID**: TC094-chunk-multi-device  
+**Category**: Chunk-Based / Multi-Device
+**Priority**: Critical
+
+## Objective
+
+Verify alternating external chunk slots, a nonzero device ID with
+`uniaddr=0`, provider identity, and a real external two-block LZ4 pcluster.
+
+## Fixture qualification
+
+Use the fresh G6 artifacts and manifest:
+
+- `multi2-*`: `/cross-device.bin` has three 131072-byte chunks with device IDs
+  `1,2,1`; slot blocks differ, so provider swapping fails deterministically.
+- `multi2-uniaddr0-*`: slot 1 has `uniaddr=0`, but indexes retain device ID 1.
+- `lz4-external-pcluster-*`: the original fixed 8192-byte LZ4 pcluster is
+  fsck-qualified before relocation.  The generated primary is only 8192 bytes,
+  contains metadata plus the table, and has HEAD pblk `2`; both compressed
+  blocks exist only in slot 1.
+
+## Alternating slots and provider identity
+
+```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 "$I/multi2-primary.erofs" -u 90
+mdconfig -a -t vnode -f "$I/multi2-slot1.blob" -u 91
+mdconfig -a -t vnode -f "$I/multi2-slot2.blob" -u 92
+mount -t erofs -o ro -o device.2=/dev/md92 -o device.1=/dev/md91 \
+  /dev/md90 /mnt/g6
+cmp "$S/cross-device.bin" /mnt/g6/cross-device.bin
+sha256 "$S/cross-device.bin" /mnt/g6/cross-device.bin
+dd if="$S/cross-device.bin" of=/tmp/tc094.expected bs=1 skip=126976 count=8192 2>/dev/null
+dd if=/mnt/g6/cross-device.bin of=/tmp/tc094.actual bs=1 skip=126976 count=8192 2>/dev/null
+cmp /tmp/tc094.expected /tmp/tc094.actual
+for off in 0 131072 262144; do
+  dd if="$S/cross-device.bin" of=/tmp/tc094.src.$off bs=1 skip=$off count=4096 2>/dev/null
+  dd if=/mnt/g6/cross-device.bin of=/tmp/tc094.mnt.$off bs=1 skip=$off count=4096 2>/dev/null
+  cmp /tmp/tc094.src.$off /tmp/tc094.mnt.$off
+done
+umount /mnt/g6
+mdconfig -d -u 92
+mdconfig -d -u 91
+mdconfig -d -u 90
+```
+
+Confirm swapped providers fail with `ENXIO`:
+
+```sh
+mdconfig -a -t vnode -f "$I/multi2-primary.erofs" -u 90
+mdconfig -a -t vnode -f "$I/multi2-slot1.blob" -u 91
+mdconfig -a -t vnode -f "$I/multi2-slot2.blob" -u 92
+truss -f -o /tmp/tc094-swap.truss mount -t erofs -o ro \
+  -o device.1=/dev/md92 -o device.2=/dev/md91 /dev/md90 /mnt/g6
+tail -20 /tmp/tc094-swap.truss
+mdconfig -d -u 92
+mdconfig -d -u 91
+mdconfig -d -u 90
+```
+
+## Zero unified address with explicit device ID
+
+```sh
+mdconfig -a -t vnode -f "$I/multi2-uniaddr0-primary.erofs" -u 90
+mdconfig -a -t vnode -f "$I/multi2-uniaddr0-slot1.blob" -u 91
+mdconfig -a -t vnode -f "$I/multi2-uniaddr0-slot2.blob" -u 92
+mount -t erofs -o ro -o device.2=/dev/md92 -o device.1=/dev/md91 \
+  /dev/md90 /mnt/g6
+cmp "$S/cross-device.bin" /mnt/g6/cross-device.bin
+umount /mnt/g6
+mdconfig -d -u 92
+mdconfig -d -u 91
+mdconfig -d -u 90
+```
+
+## External compressed pcluster
+
+```sh
+P=/root/repo22-g6/sources/pcluster
+mdconfig -a -t vnode -f "$I/lz4-external-pcluster-primary.erofs" -u 90
+mdconfig -a -t vnode -f "$I/lz4-external-pcluster-slot1.blob" -u 91
+mount -t erofs -o ro -o device.1=/dev/md91 /dev/md90 /mnt/g6
+stat -f '%z' /mnt/g6/external-pcluster.bin
+sha256 "$P/external-pcluster.bin" /mnt/g6/external-pcluster.bin
+cmp "$P/external-pcluster.bin" /mnt/g6/external-pcluster.bin
+dd if="$P/external-pcluster.bin" of=/tmp/tc094-p.src bs=1 skip=61440 count=8192 2>/dev/null
+dd if=/mnt/g6/external-pcluster.bin of=/tmp/tc094-p.mnt bs=1 skip=61440 count=8192 2>/dev/null
+cmp /tmp/tc094-p.src /tmp/tc094-p.mnt
+truss -f -o /tmp/tc094-p-ebusy.truss mdconfig -d -u 91
+tail -20 /tmp/tc094-p-ebusy.truss
+```
+
+The 131072-byte output must match although the primary has no old compressed
+extent; normal slot detach must return `EBUSY`.
+
+## Cleanup and zero-state check
+
+```sh
+umount /mnt/g6
+mdconfig -d -u 91
+mdconfig -d -u 90
+kldunload erofs
+rm -f /tmp/tc094.expected /tmp/tc094.actual /tmp/tc094.src.* \
+  /tmp/tc094.mnt.* /tmp/tc094-p.src /tmp/tc094-p.mnt
+mount -p | awk '$3 == "erofs" { print }'
+mdconfig -l
+kldstat -n erofs 2>/dev/null || true
+sysctl -n kern.geom.conftxt | grep -E 'md9[0-2]|erofs' || true
+```
+
+All four final outputs must be empty, with no panic, trap, or hang.