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feat: opt-in write-back for the mount - #20
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`wsldrive mount ... --writeback` buffers a file's writes per open handle and coalesces a contiguous run, flushing on fsync/flush/release or when the buffer passes 8 MiB. This cuts socket round-trips for write-heavy patterns (e.g. build output) at the cost of durability landing at flush/close rather than per write. Default stays write-through (durable per write). Reads flush any pending buffer first, so they never see stale bytes. Verified in WSL: 2000 small writes then close produced the exact file at the agent (2000 lines / 18890 bytes, content byte-for-byte equal); read-back through the mount matches. Also documents the remaining #12 item: hardlinks are reported as independent files (st_nlink not preserved) — a known limitation requiring an attributes/ protocol change disproportionate to its value for now. Closes #12 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Coalesces a file's writes and flushes on fsync/close (--writeback). Verified in WSL. Documents hardlink limitation.
Closes #12