43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
# Test Case: Fragment-backed compressed metabox
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**Test ID**: TC142-fragment-backed-compressed-metabox
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**Fixture**: `metabox-fragment.erofs` and its four negative variants
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## Objective
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Independently regress packed-carrier initialization before a fragment-backed
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metabox read and recursion/range rejection. Do not reuse TC140 guest results.
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## Layout qualification
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`g4_fixtures.py verify` must prove a compressed metabox carrier, whole-file
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fragment header with bit 63 set, `fragment_offset + carrier_size <= packed_size`,
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ordinary metabox/packed NIDs, bit-63 synthetic inode NIDs, CRC-valid images,
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and one-field mutations for self-loop, range, metabox recursion, and packed
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recursion. Record source and all image SHA256 values.
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## Positive steps
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```sh
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unit=$(mdconfig -a -t vnode -f /tmp/repo22-g4/images/metabox-fragment.erofs)
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mount -t erofs -o ro /dev/${unit} /mnt/repo22-g4
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stat -f 'mode=%Sp size=%z inode=%i' /mnt/repo22-g4/metabox-a
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sha256 -q /mnt/repo22-g4/metabox-a
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lsextattr user /mnt/repo22-g4/metabox-a
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getextattr -qq -x user shared-prefix-key /mnt/repo22-g4/metabox-a
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getextattr -qq -x user item /mnt/repo22-g4/metabox-a
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umount /mnt/repo22-g4
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mdconfig -d -u "${unit#md}"
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```
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## Negative steps
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Trace-mount each of the four negative images in a fresh md cycle. Capture the
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exact `nmount` errno/text, pre/post dmesg, `vmstat -m`, guest responsiveness,
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and zero mount/md cleanup.
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## Expected results
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Positive file SHA256 and values `shared-value`/`value-000` match source. Every
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negative returns `EINTEGRITY` (97), with no leak, hang, panic, trap, or residue.
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