+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#ifndef CEPH_LIBRBD_IO_AIO_COMPLETION_H
-#define CEPH_LIBRBD_IO_AIO_COMPLETION_H
-
-#include "common/Cond.h"
-#include "common/Mutex.h"
-#include "include/Context.h"
-#include "include/utime.h"
-#include "include/rbd/librbd.hpp"
-
-#include "librbd/ImageCtx.h"
-#include "librbd/io/AsyncOperation.h"
-#include "librbd/io/ReadResult.h"
-#include "librbd/io/Types.h"
-
-class CephContext;
-
-namespace librbd {
-namespace io {
-
-
-/**
- * AioCompletion is the overall completion for a single
- * rbd I/O request. It may be composed of many AioObjectRequests,
- * which each go to a single object.
- *
- * The retrying of individual requests is handled at a lower level,
- * so all AioCompletion cares about is the count of outstanding
- * requests. The number of expected individual requests should be
- * set initially using set_request_count() prior to issuing the
- * requests. This ensures that the completion will not be completed
- * within the caller's thread of execution (instead via a librados
- * context or via a thread pool context for cache read hits).
- */
-struct AioCompletion {
- typedef enum {
- AIO_STATE_PENDING = 0,
- AIO_STATE_CALLBACK,
- AIO_STATE_COMPLETE,
- } aio_state_t;
-
- mutable Mutex lock;
- Cond cond;
- aio_state_t state;
- ssize_t rval;
- callback_t complete_cb;
- void *complete_arg;
- rbd_completion_t rbd_comp;
- uint32_t pending_count; ///< number of requests
- uint32_t blockers;
- int ref;
- bool released;
- ImageCtx *ictx;
- utime_t start_time;
- aio_type_t aio_type;
-
- ReadResult read_result;
-
- AsyncOperation async_op;
-
- uint64_t journal_tid;
- xlist<AioCompletion*>::item m_xlist_item;
- bool event_notify;
-
- template <typename T, void (T::*MF)(int)>
- static void callback_adapter(completion_t cb, void *arg) {
- AioCompletion *comp = reinterpret_cast<AioCompletion *>(cb);
- T *t = reinterpret_cast<T *>(arg);
- (t->*MF)(comp->get_return_value());
- comp->release();
- }
-
- static AioCompletion *create(void *cb_arg, callback_t cb_complete,
- rbd_completion_t rbd_comp) {
- AioCompletion *comp = new AioCompletion();
- comp->set_complete_cb(cb_arg, cb_complete);
- comp->rbd_comp = (rbd_comp != nullptr ? rbd_comp : comp);
- return comp;
- }
-
- template <typename T, void (T::*MF)(int) = &T::complete>
- static AioCompletion *create(T *obj) {
- AioCompletion *comp = new AioCompletion();
- comp->set_complete_cb(obj, &callback_adapter<T, MF>);
- comp->rbd_comp = comp;
- return comp;
- }
-
- template <typename T, void (T::*MF)(int) = &T::complete>
- static AioCompletion *create_and_start(T *obj, ImageCtx *image_ctx,
- aio_type_t type) {
- AioCompletion *comp = create<T, MF>(obj);
- comp->init_time(image_ctx, type);
- comp->start_op();
- return comp;
- }
-
- AioCompletion() : lock("AioCompletion::lock", true, false),
- state(AIO_STATE_PENDING), rval(0), complete_cb(NULL),
- complete_arg(NULL), rbd_comp(NULL),
- pending_count(0), blockers(1),
- ref(1), released(false), ictx(NULL),
- aio_type(AIO_TYPE_NONE),
- journal_tid(0), m_xlist_item(this), event_notify(false) {
- }
-
- ~AioCompletion() {
- }
-
- int wait_for_complete();
-
- void finalize(ssize_t rval);
-
- inline bool is_initialized(aio_type_t type) const {
- Mutex::Locker locker(lock);
- return ((ictx != nullptr) && (aio_type == type));
- }
- inline bool is_started() const {
- Mutex::Locker locker(lock);
- return async_op.started();
- }
-
- void init_time(ImageCtx *i, aio_type_t t);
- void start_op(bool ignore_type = false);
- void fail(int r);
-
- void complete();
-
- void set_complete_cb(void *cb_arg, callback_t cb) {
- complete_cb = cb;
- complete_arg = cb_arg;
- }
-
- void set_request_count(uint32_t num);
- void add_request() {
- lock.Lock();
- assert(pending_count > 0);
- lock.Unlock();
- get();
- }
- void complete_request(ssize_t r);
-
- void associate_journal_event(uint64_t tid);
-
- bool is_complete();
-
- ssize_t get_return_value();
-
- void get() {
- lock.Lock();
- assert(ref > 0);
- ref++;
- lock.Unlock();
- }
- void release() {
- lock.Lock();
- assert(!released);
- released = true;
- put_unlock();
- }
- void put() {
- lock.Lock();
- put_unlock();
- }
- void put_unlock() {
- assert(ref > 0);
- int n = --ref;
- lock.Unlock();
- if (!n) {
- if (ictx) {
- if (event_notify) {
- ictx->completed_reqs_lock.Lock();
- m_xlist_item.remove_myself();
- ictx->completed_reqs_lock.Unlock();
- }
- if (aio_type == AIO_TYPE_CLOSE ||
- (aio_type == AIO_TYPE_OPEN && rval < 0)) {
- delete ictx;
- }
- }
- delete this;
- }
- }
-
- void block() {
- Mutex::Locker l(lock);
- ++blockers;
- }
- void unblock() {
- Mutex::Locker l(lock);
- assert(blockers > 0);
- --blockers;
- if (pending_count == 0 && blockers == 0) {
- finalize(rval);
- complete();
- }
- }
-
- void set_event_notify(bool s) {
- Mutex::Locker l(lock);
- event_notify = s;
- }
-
- void *get_arg() {
- return complete_arg;
- }
-};
-
-class C_AioRequest : public Context {
-public:
- C_AioRequest(AioCompletion *completion) : m_completion(completion) {
- m_completion->add_request();
- }
- ~C_AioRequest() override {}
- void finish(int r) override {
- m_completion->complete_request(r);
- }
-protected:
- AioCompletion *m_completion;
-};
-
-} // namespace io
-} // namespace librbd
-
-#endif // CEPH_LIBRBD_IO_AIO_COMPLETION_H
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