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