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// -*- 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) 2004-2012 Sage Weil <sage@newdream.net>
*
* 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 CEPH_LIBRADOS_AIOCOMPLETIONIMPL_H
#define CEPH_LIBRADOS_AIOCOMPLETIONIMPL_H
#include "common/ceph_mutex.h"
#include "include/buffer.h"
#include "include/xlist.h"
#include "osd/osd_types.h"
class IoCtxImpl;
struct librados::AioCompletionImpl {
ceph::mutex lock = ceph::make_mutex("AioCompletionImpl lock", false);
ceph::condition_variable cond;
int ref = 1, rval = 0;
bool released = false;
bool complete = false;
version_t objver = 0;
ceph_tid_t tid = 0;
rados_callback_t callback_complete = nullptr, callback_safe = nullptr;
void *callback_complete_arg = nullptr, *callback_safe_arg = nullptr;
// for read
bool is_read = false;
bufferlist bl;
bufferlist *blp = nullptr;
char *out_buf = nullptr;
IoCtxImpl *io = nullptr;
ceph_tid_t aio_write_seq = 0;
xlist<AioCompletionImpl*>::item aio_write_list_item;
AioCompletionImpl() : aio_write_list_item(this) { }
int set_complete_callback(void *cb_arg, rados_callback_t cb) {
std::scoped_lock l{lock};
callback_complete = cb;
callback_complete_arg = cb_arg;
return 0;
}
int set_safe_callback(void *cb_arg, rados_callback_t cb) {
std::scoped_lock l{lock};
callback_safe = cb;
callback_safe_arg = cb_arg;
return 0;
}
int wait_for_complete() {
std::unique_lock l{lock};
cond.wait(l, [this] { return complete; });
return 0;
}
int wait_for_safe() {
return wait_for_complete();
}
int is_complete() {
std::scoped_lock l{lock};
return complete;
}
int is_safe() {
return is_complete();
}
int wait_for_complete_and_cb() {
std::unique_lock l{lock};
cond.wait(l, [this] { return complete && !callback_complete && !callback_safe; });
return 0;
}
int wait_for_safe_and_cb() {
return wait_for_complete_and_cb();
}
int is_complete_and_cb() {
std::scoped_lock l{lock};
return complete && !callback_complete && !callback_safe;
}
int is_safe_and_cb() {
return is_complete_and_cb();
}
int get_return_value() {
std::scoped_lock l{lock};
return rval;
}
uint64_t get_version() {
std::scoped_lock l{lock};
return objver;
}
void get() {
std::scoped_lock l{lock};
_get();
}
void _get() {
ceph_assert(ceph_mutex_is_locked(lock));
ceph_assert(ref > 0);
++ref;
}
void release() {
lock.lock();
ceph_assert(!released);
released = true;
put_unlock();
}
void put() {
lock.lock();
put_unlock();
}
void put_unlock() {
ceph_assert(ref > 0);
int n = --ref;
lock.unlock();
if (!n)
delete this;
}
};
namespace librados {
struct CB_AioComplete {
AioCompletionImpl *c;
explicit CB_AioComplete(AioCompletionImpl *cc) : c(cc) {
c->_get();
}
void operator()() {
rados_callback_t cb_complete = c->callback_complete;
void *cb_complete_arg = c->callback_complete_arg;
if (cb_complete)
cb_complete(c, cb_complete_arg);
rados_callback_t cb_safe = c->callback_safe;
void *cb_safe_arg = c->callback_safe_arg;
if (cb_safe)
cb_safe(c, cb_safe_arg);
c->lock.lock();
c->callback_complete = NULL;
c->callback_safe = NULL;
c->cond.notify_all();
c->put_unlock();
}
};
/**
* Fills in all completed request data, and calls both
* complete and safe callbacks if they exist.
*
* Not useful for usual I/O, but for special things like
* flush where we only want to wait for things to be safe,
* but allow users to specify any of the callbacks.
*/
struct CB_AioCompleteAndSafe {
AioCompletionImpl *c;
explicit CB_AioCompleteAndSafe(AioCompletionImpl *cc) : c(cc) {
c->get();
}
CB_AioCompleteAndSafe(const CB_AioCompleteAndSafe&) = delete;
CB_AioCompleteAndSafe& operator =(const CB_AioCompleteAndSafe&) = delete;
CB_AioCompleteAndSafe(CB_AioCompleteAndSafe&& rhs) {
c = rhs.c;
rhs.c = nullptr;
}
CB_AioCompleteAndSafe& operator =(CB_AioCompleteAndSafe&& rhs) {
c = rhs.c;
rhs.c = nullptr;
return *this;
}
void operator()(int r = 0) {
c->lock.lock();
c->rval = r;
c->complete = true;
c->lock.unlock();
rados_callback_t cb_complete = c->callback_complete;
void *cb_complete_arg = c->callback_complete_arg;
if (cb_complete)
cb_complete(c, cb_complete_arg);
rados_callback_t cb_safe = c->callback_safe;
void *cb_safe_arg = c->callback_safe_arg;
if (cb_safe)
cb_safe(c, cb_safe_arg);
c->lock.lock();
c->callback_complete = NULL;
c->callback_safe = NULL;
c->cond.notify_all();
c->put_unlock();
}
};
}
#endif
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