From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/mds/MDSContext.h | 212 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 212 insertions(+) create mode 100644 src/mds/MDSContext.h (limited to 'src/mds/MDSContext.h') diff --git a/src/mds/MDSContext.h b/src/mds/MDSContext.h new file mode 100644 index 000000000..319af50d3 --- /dev/null +++ b/src/mds/MDSContext.h @@ -0,0 +1,212 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2012 Red Hat + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + + +#ifndef MDS_CONTEXT_H +#define MDS_CONTEXT_H + +#include +#include + +#include "include/Context.h" +#include "include/elist.h" +#include "include/spinlock.h" +#include "common/ceph_time.h" + +class MDSRank; + +/** + * Completion which has access to a reference to the global MDS instance. + * + * This class exists so that Context subclasses can provide the MDS pointer + * from a pointer they already had, e.g. MDCache or Locker, rather than + * necessarily having to carry around an extra MDS* pointer. + */ +class MDSContext : public Context +{ +public: +template class A> + using vec_alloc = std::vector>; + using vec = vec_alloc; + +template class A> + using que_alloc = std::deque>; + using que = que_alloc; + + void complete(int r) override; + virtual MDSRank *get_mds() = 0; +}; + +/* Children of this could have used multiple inheritance with MDSHolder and + * MDSContext but then get_mds() would be ambiguous. + */ +template +class MDSHolder : public T +{ +public: + MDSRank* get_mds() override { + return mds; + } + +protected: + MDSHolder() = delete; + MDSHolder(MDSRank* mds) : mds(mds) { + ceph_assert(mds != nullptr); + } + + MDSRank* mds; +}; + +/** + * General purpose, lets you pass in an MDS pointer. + */ +class MDSInternalContext : public MDSHolder +{ +public: + MDSInternalContext() = delete; + +protected: + explicit MDSInternalContext(MDSRank *mds_) : MDSHolder(mds_) {} +}; + +/** + * Wrap a regular Context up as an Internal context. Useful + * if you're trying to work with one of our more generic frameworks. + */ +class MDSInternalContextWrapper : public MDSInternalContext +{ +protected: + Context *fin = nullptr; + void finish(int r) override; +public: + MDSInternalContextWrapper(MDSRank *m, Context *c) : MDSInternalContext(m), fin(c) {} +}; + +class MDSIOContextBase : public MDSContext +{ +public: + MDSIOContextBase(bool track=true); + virtual ~MDSIOContextBase(); + MDSIOContextBase(const MDSIOContextBase&) = delete; + MDSIOContextBase& operator=(const MDSIOContextBase&) = delete; + + void complete(int r) override; + + virtual void print(std::ostream& out) const = 0; + + static bool check_ios_in_flight(ceph::coarse_mono_time cutoff, + std::string& slow_count, + ceph::coarse_mono_time& oldest); +private: + ceph::coarse_mono_time created_at; + elist::item list_item; + + friend struct MDSIOContextList; +}; + +/** + * Completion for an log operation, takes big MDSRank lock + * before executing finish function. Update log's safe pos + * after finish function return. + */ +class MDSLogContextBase : public MDSIOContextBase +{ +protected: + uint64_t write_pos = 0; +public: + MDSLogContextBase() = default; + void complete(int r) final; + void set_write_pos(uint64_t wp) { write_pos = wp; } + virtual void pre_finish(int r) {} + void print(std::ostream& out) const override { + out << "log_event(" << write_pos << ")"; + } +}; + +/** + * Completion for an I/O operation, takes big MDSRank lock + * before executing finish function. + */ +class MDSIOContext : public MDSHolder +{ +public: + explicit MDSIOContext(MDSRank *mds_) : MDSHolder(mds_) {} +}; + +/** + * Wrap a regular Context up as an IO Context. Useful + * if you're trying to work with one of our more generic frameworks. + */ +class MDSIOContextWrapper : public MDSHolder +{ +protected: + Context *fin; +public: + MDSIOContextWrapper(MDSRank *m, Context *c) : MDSHolder(m), fin(c) {} + void finish(int r) override; + void print(std::ostream& out) const override { + out << "io_context_wrapper(" << fin << ")"; + } +}; + +/** + * No-op for callers expecting MDSInternalContext + */ +class C_MDSInternalNoop : public MDSContext +{ +public: + void finish(int r) override {} + void complete(int r) override { delete this; } +protected: + MDSRank* get_mds() override final {ceph_abort();} +}; + + +/** + * This class is used where you have an MDSInternalContext but + * you sometimes want to call it back from an I/O completion. + */ +class C_IO_Wrapper : public MDSIOContext +{ +protected: + bool async; + MDSContext *wrapped; + void finish(int r) override { + wrapped->complete(r); + wrapped = nullptr; + } +public: + C_IO_Wrapper(MDSRank *mds_, MDSContext *wrapped_) : + MDSIOContext(mds_), async(true), wrapped(wrapped_) { + ceph_assert(wrapped != NULL); + } + + ~C_IO_Wrapper() override { + if (wrapped != nullptr) { + delete wrapped; + wrapped = nullptr; + } + } + void complete(int r) final; + void print(std::ostream& out) const override { + out << "io_wrapper(" << wrapped << ")"; + } +}; + +using MDSGather = C_GatherBase; +using MDSGatherBuilder = C_GatherBuilderBase; + +using MDSContextFactory = ContextFactory; + +#endif // MDS_CONTEXT_H -- cgit v1.2.3