matthew
b327e6ed37
Pre-0.17.11 sweep ran strictly serialised: SCSI read → decrypt → seek + write → mapfile.record → next read. Drive idled for the post-read work; throughput capped at the sum of both costs. On a healthy disc that's ~7-12 ms read + ~5-15 ms write/record per 64 KB batch, limiting sustained throughput to ~10-12 MB/s on the test bed (BU40N + UHD inner zone), well below the ~14-16 MB/s drive ceiling. Decouples them: producer thread (caller's) owns SectorReader + read_error state + decrypt + set_speed + halt; consumer thread (one spawn) owns Writer + Mapfile, receives WorkItem messages, applies file write + mapfile record. Bounded mpsc::sync_channel(4) gives natural back-pressure. While the consumer writes batch N, the producer is already reading batch N+1 — steady-state throughput is now bound by the slower of the two pipelines (drive on healthy discs), not their sum. Side effects: - Bisect path now decrypts. Pre-0.17.11 the bisect inner loop wrote raw cyphertext for single-sector recoveries on encrypted discs — quiet correctness bug exercised only by batch-fail-then- bisect-succeed on encrypted media. New producer-side decrypt covers main + bisect success paths uniformly. - All read_ctx state stays single-threaded on producer (damage window, jump multiplier, etc.). No locking added. - Mapfile remains single-writer on consumer. No locking. - Halt latency: producer breaks loop, sends Finish, consumer drains ≤4 in-flight items + sync_all. ~1 batch (~12 ms) typical. - BU40N + Initio bridge wedge concern unchanged: still single SCSI command in flight, error-path timing identical, no new retries. New module: src/disc/sweep_pipeline.rs (WorkItem, ProgressSnapshot, ConsumerInputs, spawn_consumer, consumer_loop, helpers). Public API unchanged — Disc::copy / CopyOptions / CopyResult identical. Patch (Pass N) is NOT changed; it's bound by drive recovery time, not the read/write serialisation.
45 lines
1.1 KiB
TOML
45 lines
1.1 KiB
TOML
[package]
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name = "libfreemkv"
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version = "0.17.11"
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edition = "2024"
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rust-version = "1.86"
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license = "AGPL-3.0-only"
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description = "Open source raw disc access library for optical drives"
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repository = "https://github.com/freemkv/libfreemkv"
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keywords = ["bluray", "uhd", "optical", "scsi", "disc"]
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categories = ["hardware-support", "multimedia"]
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[dependencies]
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serde = { version = "1", features = ["derive"] }
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serde_json = "1"
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sha1 = "0.10"
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sha2 = "0.10"
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aes = "0.8"
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cbc = "0.1"
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flate2 = "1"
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num-bigint = "0.4"
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num-traits = "0.2"
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num-integer = "0.1"
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rand = "0.8"
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cmac = "0.7"
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zip = { version = "2", default-features = false, features = ["deflate"] }
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base64 = "0.22.1"
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# Trace-level instrumentation for Disc::copy + SgIoTransport::execute. Permitted
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# under CLAUDE.md ("Acceptable strings: debug/trace logging"). Consumers (autorip)
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# wire a tracing subscriber and pipe events into the JSONL debug log.
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tracing = "0.1"
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[target.'cfg(target_os = "linux")'.dependencies]
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libc = "0.2"
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[target.'cfg(target_os = "macos")'.dependencies]
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libc = "0.2"
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[dev-dependencies]
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tempfile = "3"
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[[bench]]
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name = "sgio_read"
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harness = false
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