update

tests/TC099-multidev-2devices.md

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+# Test Case: Primary Plus One mkfs Blob Provider
+
+**Test ID**: TC099-multidev-2devices  
+**Category**: Multi-Device  
+**Priority**: Critical
+
+## Objective
+
+Verify the common two-provider layout emitted directly by erofs-utils 1.8.6,
+including statfs aggregation and fail-closed omission of the blob provider.
+
+## Positive 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
+mount -p | grep '/mnt/g6'
+df -k /mnt/g6
+sha256 "$S/tc006.bin" /mnt/g6/tc006.bin
+cmp "$S/tc006.bin" /mnt/g6/tc006.bin
+dd if="$S/tc006.bin" of=/tmp/tc099.src bs=1 skip=28672 count=8192 2>/dev/null
+dd if=/mnt/g6/tc006.bin of=/tmp/tc099.mnt bs=1 skip=28672 count=8192 2>/dev/null
+cmp /tmp/tc099.src /tmp/tc099.mnt
+```
+
+The manifest reports primary blocks 1 and slot blocks 224, so `df -k` must
+report 900 one-kilobyte blocks.  Metadata comes from md90; all file bytes come
+from md91.
+
+Unmount and detach both providers before the negative step.
+
+## Missing blob option
+
+```sh
+umount /mnt/g6
+mdconfig -d -u 91
+mdconfig -d -u 90
+mdconfig -a -t vnode -f "$I/mkfs-blob-primary.erofs" -u 90
+truss -f -o /tmp/tc099-enxio.truss mount -t erofs -o ro \
+  /dev/md90 /mnt/g6
+tail -20 /tmp/tc099-enxio.truss
+```
+
+Mount must return exactly `ENXIO`: the 4096-byte split primary is shorter than
+the declared flatdev range.
+
+## Cleanup and zero-state check
+
+```sh
+mdconfig -d -u 90
+kldunload erofs
+rm -f /tmp/tc099.src /tmp/tc099.mnt
+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.