LayerFS 0.1.3 Developer Preview

LayerFS 0.1.3 Developer Preview

LayerFS 0.1.3 is a benchmark-driven redesign of Commit processing, temporary backing, live Workspace execution, and authenticated reads.

Highlights

• Shared live Workspace core for FUSE operations and SDK edits, with commands and handles continuing across live-FUSE Commit boundaries.
• In-place checkpoint installation, ordered namespace finalization, shared backing segments, and owned object admission remove repeated reconstruction, file cleanup, copying, and spill readback.
• Payload, CAS/CDC, and Workspace-reuse scaling improvements with separately recorded qualification campaigns.
• Approximately 3× faster measured high-tier Git workflows: 5.83→1.85 seconds and 14.12→4.64 seconds in the corrected comparison (one baseline observation, three-run final medians); backing requests fell about 92%.
• Repairs for stale mapped-page writeback over SDK edits, failed-owner Discard, hard-link preservation, and post-publication presentation recovery. Release qualification additionally fixed premature SDK-protection retirement while admitted writebacks were still queued.
• 198/198 performance cases and 226/226 routine proofs pass across 17 families. Final mixed-file lifecycle observations include create 1,000 files/100 MiB in 0.990 seconds and delete in 0.259 seconds. These are single observations, not latency guarantees.
• Simplified benchmark infrastructure and bounded history verification with explicit coverage.

Read the numbered changelog, technical explanation, and every-family/every-case benchmark tables.

Upgrade and limits

Schema 4 is migrated to schema 5 on connect; old binaries cannot reopen the upgraded Store. Keep a separate pre-upgrade backup and use matching 0.1.3 SDK/CLI, owner, daemon, and FUSE builds. Canonical object identities remain unchanged. Materialized Workspaces retain the active-execution Busy restriction.

This is a source-only Developer Preview, following the existing release model. There are no published crates.io packages, executables, or runtime images. Crash/power-loss durability remains unsupported. Git latency targets remain missed; history verification includes sampled snapshots, and the separate 600-second endurance test is excluded from the final checkpoint. Historical exploratory results and changed workload recipes remain explicitly identified.

Verification and assets

See the verification record, manual, and release contract.

Checksummed source archives, the published benchmark-evidence bundle, Cargo.lock, and LICENSE accompany this release. SHA256SUMS identifies each asset.

Published source and CI

• Annotated tag: v0.1.3 at 49f0f5be911e7f5b92afc2becab45144ad7a1307.
• Merged release PR #85.
• Successful final PR CI.
• Successful merged-source CI.
• Repaired-source local checks: 348 native test results passed, one pre-existing ignored; all 26 FUSE library tests passed; three predeclared live Docker/FUSE runs passed all three tests each (9/9 executions). Original failures and scope are retained in the verification record.

The benchmark measurements remain pinned to their original source. The release includes the separately verified admitted-writeback correction; no timing is relabeled as a new run of this release source.