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@@ -77,6 +77,14 @@ answer Tversion with `negotiate()`. Answer other requests with `reply()`. The backend implements its filesystem and fid lifecycle; cloud9 checks reply types, tags, counts, negotiated frame sizes, and flush completion. +`fs.Server(Backend, options)` is a file server on top of that session: it keeps +the fids, permissions, directory cursors, flush and hangup, and turns each 9P +request into backend operations (`fs.Req`: lookup, getattr, setattr, open, +read, write, release, readdir) that the backend answers by tag with `fs.Reply`, +at once or later; a read or write may park with `Status.again` and is retried. +Table sizes are comptime `fs.Options`; nothing allocates. See +[the engine's contract](docs/design.md#file-server-engine). + ## Programs Related programs live in `cloud9/<name>/`, one directory per program beside |