MattJackson
0d28357b4d
Introduces the SequentialSink / RandomAccessSink trait pair under io::sink and an open_for_mkv dispatch helper that picks WritebackFile on Linux+NFS and LocalFileSink everywhere else. LocalFileSink wraps BufWriter<File> with a 4 MiB buffer and exposes a per-OS preallocate path (fallocate on Linux, F_PREALLOCATE on macOS, no-op fallback). Adds platform::fs_type::detect with a per-OS split (statfs on Linux / macOS, UNC heuristic on Windows, Unknown elsewhere) so construction- site dispatch has a single primitive to call. Blanket impls cover the common shapes: any Write+Send is a SequentialSink, and any SequentialSink+Seek is a RandomAccessSink. WritebackFile satisfies the random-access trait via the blanket impl without needing an explicit per-type impl. No callers wired yet — the mux::resolve construction sites stay on WritebackFile pending Phase 3. Tests: 5 new sink/preallocate tests + 3 fs_type tests (1 ignored, needs a real NFS mount). cargo +1.86 fmt + clippy + tests all green.
28 lines
897 B
Rust
28 lines
897 B
Rust
//! Per-OS extent preallocation. Best-effort; failures are logged at
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//! debug and otherwise swallowed because the file is still usable
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//! without the size reservation — only large-file fragmentation gets
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//! marginally worse.
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use std::fs::File;
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#[cfg(target_os = "linux")]
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mod linux;
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#[cfg(target_os = "macos")]
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mod macos;
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#[cfg(not(any(target_os = "linux", target_os = "macos")))]
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mod other;
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#[cfg(target_os = "linux")]
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use linux::preallocate_impl;
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#[cfg(target_os = "macos")]
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use macos::preallocate_impl;
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#[cfg(not(any(target_os = "linux", target_os = "macos")))]
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use other::preallocate_impl;
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/// Reserve `size_bytes` of disk space for `file`'s on-disk extents.
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/// Reported file size is unchanged — writes still grow the file
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/// naturally; only the allocator's extent map is primed.
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pub(super) fn preallocate(file: &File, size_bytes: u64) {
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preallocate_impl(file, size_bytes);
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}
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