27 lines
828 B
Markdown
27 lines
828 B
Markdown
# Test Case: Bounded Read of 5 GiB Extent Hole
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**Test ID**: TC152-extent-hole-bounded-read
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**Category**: Compression Extent Mapping
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**Priority**: Critical
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## Objective
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Verify a 5 GiB plus one page unmapped compression extent clears only the
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requested byte/page, with bounded allocation.
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## Procedure
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Record final/fixture-evidence.txt and the extent-hole-5g.erofs hash. On a fresh
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mount, record stat and the erofs vmstat -m row, then run twice:
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/usr/bin/time -l ./sparse_hole_probe \
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/tmp/repo22-g3/mnt/hole.dat 3221225472
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Record the post-run allocation row, dmesg, and cleanup.
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## Expected Results
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The mounted size is 5368713216. Both one-byte pread calls and real one-page mmap
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faults at 3 GiB return zero promptly; allocation does not scale with the 5 GiB
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logical hole. No OOM, hang, trap, or panic occurs.
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