mirror of
https://github.com/facebook/sapling.git
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d9d28036e5
Summary: We'll need to gate portions of our shutdown so that we don't tear down the database until after in-flight requests have completed. This seems like the easiest way to go about it. Reviewed By: simpkins Differential Revision: D5796593 fbshipit-source-id: 49e695826ae68cc2b1d724a8da53ce5d884ff9ff
142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include <folly/ThreadLocal.h>
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#include <folly/futures/Future.h>
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#include <folly/io/async/Request.h>
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#include "eden/fs/fuse/EdenStats.h"
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#include "eden/fs/fuse/fuse_headers.h"
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namespace facebook {
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namespace eden {
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namespace fusell {
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class Dispatcher;
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class RequestData : public folly::RequestData {
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std::atomic<fuse_req_t> req_;
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// We're managed by this context, so we only keep a weak ref
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std::weak_ptr<folly::RequestContext> requestContext_;
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// Needed to track stats
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std::chrono::time_point<std::chrono::steady_clock> startTime_;
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EdenStats::HistogramPtr latencyHistogram_{nullptr};
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ThreadLocalEdenStats* stats_{nullptr};
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Dispatcher* dispatcher_{nullptr};
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static void interrupter(fuse_req_t req, void* data);
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fuse_req_t stealReq();
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struct Cancel {
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folly::Future<folly::Unit> fut_;
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explicit Cancel(folly::Future<folly::Unit>&& fut) : fut_(std::move(fut)) {}
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};
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public:
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static const std::string kKey;
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RequestData(const RequestData&) = delete;
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RequestData& operator=(const RequestData&) = delete;
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RequestData(RequestData&&) = default;
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RequestData& operator=(RequestData&&) = default;
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explicit RequestData(fuse_req_t req, Dispatcher* dispatcher);
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~RequestData();
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static RequestData& get();
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static RequestData& create(fuse_req_t req);
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// Returns true if the current context is being called from inside
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// a FUSE request, false otherwise.
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static bool isFuseRequest();
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folly::Future<folly::Unit> startRequest(
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ThreadLocalEdenStats* stats,
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EdenStats::HistogramPtr histogram);
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void finishRequest();
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// Returns the request context, which holds uid, gid, pid and umask info
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const fuse_ctx& getContext() const;
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// Returns the associated dispatcher instance
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Dispatcher* getDispatcher() const;
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// Returns the underlying fuse request, throwing an error if it has
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// already been released
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fuse_req_t getReq() const;
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// Check whether the request has already been interrupted
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bool wasInterrupted() const;
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/** Register the future chain associated with this request so that
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* we can cancel it when we receive an interrupt.
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* This function will append error handling to the future chain by
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* passing it to catchErrors() prior to registering the cancellation
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* handler.
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*/
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template <typename FUTURE>
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void setRequestFuture(FUTURE&& fut) {
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this->interrupter_ =
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std::make_unique<Cancel>(this->catchErrors(std::move(fut)));
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}
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/** Append error handling clauses to a future chain
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* These clauses result in reporting a fuse request error back to the
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* kernel. */
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template <typename FUTURE>
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folly::Future<folly::Unit> catchErrors(FUTURE&& fut) {
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return fut.onError(systemErrorHandler)
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.onError(genericErrorHandler)
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.ensure([] { RequestData::get().finishRequest(); });
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}
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static void systemErrorHandler(const std::system_error& err);
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static void genericErrorHandler(const std::exception& err);
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// Returns the supplementary group IDs for the process making the
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// current request
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std::vector<gid_t> getGroups() const;
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// The various fuse_reply_XXX functions implicity free the request
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// pointer. We prefer to avoid keeping a stale pointer, hence these
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// methods to maintain consistency.
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// If the replyXXX function returns false, it means that the request
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// was interrupted and that the dispatcher may need to clean up some
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// of its state.
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// Reply with a negative errno value or 0 for success
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void replyError(int err);
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// Don't send a reply, just release req_
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void replyNone();
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// Reply with a directory entry
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void replyEntry(const struct fuse_entry_param& e);
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// Reply with a directory entry and open params
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bool replyCreate(const struct fuse_entry_param& e,
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const struct fuse_file_info& fi);
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void replyAttr(const struct stat& attr, double attr_timeout);
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void replyReadLink(const std::string& link);
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bool replyOpen(const struct fuse_file_info& fi);
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void replyWrite(size_t count);
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void replyBuf(const char* buf, size_t size);
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void replyIov(const struct iovec* iov, int count);
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void replyStatfs(const struct statvfs& st);
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void replyXattr(size_t count);
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void replyLock(struct flock& lock);
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void replyBmap(uint64_t idx);
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void replyIoctl(int result, const struct iovec* iov, int count);
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void replyPoll(unsigned revents);
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private:
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std::unique_ptr<Cancel> interrupter_;
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};
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}
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}
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}
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