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| // Copyright 2024 the Go-FUSE Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| package fuse | ||
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| import ( | ||
| "sync" | ||
| ) | ||
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| // protocolServer bridges from the FUSE datatypes to a RawFileSystem | ||
| type protocolServer struct { | ||
| fileSystem RawFileSystem | ||
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| interruptMu sync.Mutex | ||
| reqInflight []*request | ||
| connectionDead bool | ||
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| latencies LatencyMap | ||
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| kernelSettings InitIn | ||
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| opts *MountOptions | ||
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| // in-flight notify-retrieve queries | ||
| retrieveMu sync.Mutex | ||
| retrieveNext uint64 | ||
| retrieveTab map[uint64]*retrieveCacheRequest // notifyUnique -> retrieve request | ||
| } | ||
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| func (ms *protocolServer) handleRequest(h *operationHandler, req *request) { | ||
| ms.addInflight(req) | ||
| defer ms.dropInflight(req) | ||
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| if req.status.Ok() && ms.opts.Debug { | ||
| ms.opts.Logger.Println(req.InputDebug()) | ||
| } | ||
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| if req.inHeader().NodeId == pollHackInode || | ||
| req.inHeader().NodeId == FUSE_ROOT_ID && h.FileNames > 0 && req.filename() == pollHackName { | ||
| doPollHackLookup(ms, req) | ||
| } else if req.status.Ok() && h.Func == nil { | ||
| ms.opts.Logger.Printf("Unimplemented opcode %v", operationName(req.inHeader().Opcode)) | ||
| req.status = ENOSYS | ||
| } else if req.status.Ok() { | ||
| h.Func(ms, req) | ||
| } | ||
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| // Forget/NotifyReply do not wait for reply from filesystem server. | ||
| switch req.inHeader().Opcode { | ||
| case _OP_FORGET, _OP_BATCH_FORGET, _OP_NOTIFY_REPLY: | ||
| req.suppressReply = true | ||
| case _OP_INTERRUPT: | ||
| // ? what other status can interrupt generate? | ||
| if req.status.Ok() { | ||
| req.suppressReply = true | ||
| } | ||
| } | ||
| if req.status == EINTR { | ||
| ms.interruptMu.Lock() | ||
| dead := ms.connectionDead | ||
| ms.interruptMu.Unlock() | ||
| if dead { | ||
| req.suppressReply = true | ||
| } | ||
| } | ||
| if req.suppressReply { | ||
| return | ||
| } | ||
| if req.inHeader().Opcode == _OP_INIT && ms.kernelSettings.Minor <= 22 { | ||
| // v8-v22 don't have TimeGran and further fields. | ||
| // This includes osxfuse (a.k.a. macfuse). | ||
| req.outHeader().Length = uint32(sizeOfOutHeader) + 24 | ||
| } | ||
| if req.fdData != nil && ms.opts.DisableSplice { | ||
| req.outPayload, req.status = req.fdData.Bytes(req.outPayload) | ||
| req.fdData = nil | ||
| } | ||
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| req.serializeHeader(req.outPayloadSize()) | ||
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| if ms.opts.Debug { | ||
| ms.opts.Logger.Println(req.OutputDebug()) | ||
| } | ||
| } | ||
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| func (ms *protocolServer) addInflight(req *request) { | ||
| ms.interruptMu.Lock() | ||
| defer ms.interruptMu.Unlock() | ||
| req.inflightIndex = len(ms.reqInflight) | ||
| ms.reqInflight = append(ms.reqInflight, req) | ||
| } | ||
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| func (ms *protocolServer) dropInflight(req *request) { | ||
| ms.interruptMu.Lock() | ||
| defer ms.interruptMu.Unlock() | ||
| this := req.inflightIndex | ||
| last := len(ms.reqInflight) - 1 | ||
| if last != this { | ||
| ms.reqInflight[this] = ms.reqInflight[last] | ||
| ms.reqInflight[this].inflightIndex = this | ||
| } | ||
| ms.reqInflight = ms.reqInflight[:last] | ||
| } | ||
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| func (ms *protocolServer) interruptRequest(unique uint64) Status { | ||
| ms.interruptMu.Lock() | ||
| defer ms.interruptMu.Unlock() | ||
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| // This is slow, but this operation is rare. | ||
| for _, inflight := range ms.reqInflight { | ||
| if unique == inflight.inHeader().Unique && !inflight.interrupted { | ||
| close(inflight.cancel) | ||
| inflight.interrupted = true | ||
| return OK | ||
| } | ||
| } | ||
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| return EAGAIN | ||
| } | ||
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| func (ms *protocolServer) cancelAll() { | ||
| ms.interruptMu.Lock() | ||
| defer ms.interruptMu.Unlock() | ||
| ms.connectionDead = true | ||
| for _, req := range ms.reqInflight { | ||
| if !req.interrupted { | ||
| close(req.cancel) | ||
| req.interrupted = true | ||
| } | ||
| } | ||
| // Leave ms.reqInflight alone, or dropInflight will barf. | ||
| } |
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