surface-camera-build 78540b5687
cubelinux: the fold reads the layout it writes ...
Found on the box, minutes after the live store was folded for the first time: the second fold
answered -EINVAL. `build_merged` parsed the packed layout — `space | key | len | value`, repeated —
so it could read a store that had never been folded and nothing else. The first fold reads packed
and writes addressed; every fold after that reads addressed, which is what a store does for the rest
of its life. As written, a store could be folded exactly once and then never again — the log would
grow until it filled.
No gate folded twice, which is why it got this far: verify-kernel-checkpoint.sh, verify-frontend.sh
and verify-enum-cost.sh each folded a packed store once. The guest's bench folds twice now, and
verify-enum-cost.sh insists on the second one — "a store can be folded once and then never again,
which is not a layout" — so the case is covered rather than remembered.
The v3 branch reads through the shared format's own arithmetic: the space table gives each space's
index range, the index gives each key and the value's place, and the log is applied over the result
exactly as before. The packed path is untouched.
Verified: verify-enum-cost.sh (which now folds twice and still measures 1.0x for a 40x store) and
verify-kernel-checkpoint.sh (the image a fold writes holds exactly what userspace holds).
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surface-camera-build
78540b5687