56 lines
1.7 KiB
Markdown
56 lines
1.7 KiB
Markdown
# Test Case: Indexed Chunk Data on the Primary Device
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**Test ID**: TC093-chunk-single-device
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**Category**: Chunk-Based
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**Priority**: High
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## Objective
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Verify 8-byte chunk indexes whose device ID is zero without a device table.
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This is not a 4-byte block-map substitute.
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## Fixture
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Use `single-indexed.erofs` from the fresh G6 generator. It is derived from the
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mkfs blob baseline by asserting each original `(high=0, device=1, pblk)`,
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folding the new blob bytes behind the metadata block, changing every index to
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`device=0`, adding one to each pblk, and removing the device-table feature.
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`verify` must report `extra_devices=0` and `entry_size=8`.
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## Manual procedure
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```sh
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I=/root/repo22-g6/images
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S=/root/repo22-g6/sources/chunk
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mkdir -p /mnt/g6
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kldload /root/repo22-g6/erofs.ko
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mdconfig -a -t vnode -f "$I/single-indexed.erofs" -u 90
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mount -t erofs -o ro /dev/md90 /mnt/g6
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sha256 "$S/indexed.bin" /mnt/g6/indexed.bin
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cmp "$S/indexed.bin" /mnt/g6/indexed.bin
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dd if="$S/indexed.bin" of=/tmp/tc093.expected bs=1 skip=28672 count=8192 2>/dev/null
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dd if=/mnt/g6/indexed.bin of=/tmp/tc093.actual bs=1 skip=28672 count=8192 2>/dev/null
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cmp /tmp/tc093.expected /tmp/tc093.actual
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```
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## Expected results
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- Mount succeeds without any `device.N` option.
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- Full-file and cross-32768-byte-chunk comparisons pass.
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- No external GEOM provider or device-table lookup is attempted.
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## Cleanup and zero-state check
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```sh
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umount /mnt/g6
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mdconfig -d -u 90
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kldunload erofs
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rm -f /tmp/tc093.expected /tmp/tc093.actual
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mount -p | awk '$3 == "erofs" { print }'
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mdconfig -l
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kldstat -n erofs 2>/dev/null || true
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sysctl -n kern.geom.conftxt | grep -E 'md90|erofs' || true
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```
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All four final outputs must be empty.
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