45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
# Test Case: 48-bit Block Count Parsing
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**Test ID**: TC017-48bit-blocks-parse
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**Category**: Filesystem Metadata
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**Priority**: Medium
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## Objective
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Verify the Linux EROFS union rule dynamically: with incompat bit `0x80` and a
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nonzero `rootnid_8b`, combine `blocks_lo` with `rb.blocks_hi << 32` and preserve
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the complete count through mount.
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## Fixture Qualification
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```sh
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work=$(mktemp -d /tmp/repo22-tc017.XXXXXX)
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tests/prepare_error_fixtures.sh "$work/fixtures"
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python3 tests/erofs_fixture.py inspect \
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"$work/fixtures/48bit-statfs-prefix.erofs"
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od -An -tx2 -j 1038 -N 2 "$work/fixtures/48bit-statfs-prefix.erofs"
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od -An -tx4 -j 1060 -N 4 "$work/fixtures/48bit-statfs-prefix.erofs"
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od -An -tx8 -j 1136 -N 8 "$work/fixtures/48bit-statfs-prefix.erofs"
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grep '^48bit-statfs-prefix ' "$work/fixtures/fixture-evidence.txt"
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```
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Require `blocks_hi=1`, `rootnid_8b != 0`, a valid recomputed CRC, and a recorded
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prefix SHA256. The expected count is `blocks_lo | (1 << 32)`.
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## FreeBSD Procedure
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Create and attach the sparse provider exactly as in TC010. Record `diskinfo`,
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mount it read-only, compare `df -k` total with `total_blocks * 4`, read
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`control.txt`, then unmount and detach the dynamic md unit.
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Also attach the unextended small prefix once and require mount failure with
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`ENXIO`; record this only as the negative media-size guard, not the positive
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parse result.
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## Expected Results
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The sparse provider mount succeeds and reports the full nonzero-high-word count.
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The small prefix fails `ENXIO`. If no qualifying provider can be attached,
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record the metadata parsing evidence separately and mark the dynamic portion
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SHELVED, never PASS.
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