docs(engine): pick ENOSPC injection mechanism for spill tests (SPL-33.a)#4770
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Evaluate five candidate ENOSPC injection mechanisms (tmpfs size-cap, fallocate filler, mock writer, failpoints crate, fuse-mt) against CI compatibility on the Linux musl / macOS / Windows tiles and against the SPL-32 audit's site inventory. Recommend a userspace mock writer for the unit-test layer plus a Linux-gated fallocate filler for one real-kernel integration test, and pin the chosen mechanism's API surface in pseudo-code so SPL-33.b has a concrete target. Cross-references docs/design/spill-fs-error-audit.md (SPL-32) for the syscall site inventory and the SpillError::PriorSpillsLost wiring landed via SPL-35/36/37 (#4749).
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Summary
size=N,fallocatefiller, mock writer,failpointscrate,fuse-mt) against CI compatibility on the Linux musl / macOS / Windows tiles and against the SPL-32 audit's syscall-site inventory.FaultingFile+FaultPlanunder#[cfg(test)]) for the SPL-33.b unit-test layer, paired with a single Linux-gatedfallocatefiller integration test for real-kernel coverage. Pins the chosen mechanism's API surface in pseudo-code so SPL-33.b has a concrete implementation target.docs/design/spill-fs-error-audit.md(SPL-32, 23 syscall sites: 9 recoverable / 17 bubble-up / 3 silent) and theSpillError::PriorSpillsLostwiring shipped via SPL-35/36/37 (feat(engine): SpillError::PriorSpillsLost typed variant + consumer wiring (SPL-35..37) #4749).Test plan
git diff --statshows one new markdown file underdocs/design/.FaultPlanAPI surface and the seven-row test matrix unchanged.