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9proc's own fid table, walk loop and dir-read engine are replaced by
cloud9.fs.Server; the tree (static, vars, providers) is served through the
engine's Req/Reply contract with node ids that keep the old qid scheme.
Providers may answer later by returning error.Again (parked in the engine,
retried each step, Tflush -> EINTR); no new files are exposed.
Engine (backward compatible, all opt-in via Backend.features / Options):
create, remove, wstat, reference accounting for backends that count
handles, a salted fid index, name_capacity 0 (names from getattr),
Reply.ename for backend-chosen error text, Attr.path/version/atime.
Engine-level error strings and the 217-byte msize floor now apply to 9proc;
tests updated accordingly.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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The asynchronous 9P file-server engine from the Pardes editor moves into the
library: fid table, walks, directory cursors, a job/slot model where backend
replies arrive later by tag (status again = parked), Tflush cancellation and
orphaned fids on hangup. Allocation-free, no OS calls, no std.Io; comptime
Options (fid, slot, park data, name and user capacities) replace the
editor's constants. Backend contract types (Req, Reply/ReplyWith, Op,
Status, Attr, E, error strings) live here. 29 engine tests plus the client
tests that sat beside it in Pardes.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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