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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/AsyncObjectThrottle.h"
#include "common/RWLock.h"
#include "common/WorkQueue.h"
#include "librbd/AsyncRequest.h"
#include "librbd/ImageCtx.h"
#include "librbd/Utils.h"
namespace librbd
{
template <typename T>
AsyncObjectThrottle<T>::AsyncObjectThrottle(
const AsyncRequest<T>* async_request, T &image_ctx,
const ContextFactory& context_factory, Context *ctx,
ProgressContext *prog_ctx, uint64_t object_no, uint64_t end_object_no)
: m_lock(util::unique_lock_name("librbd::AsyncThrottle::m_lock", this)),
m_async_request(async_request), m_image_ctx(image_ctx),
m_context_factory(context_factory), m_ctx(ctx), m_prog_ctx(prog_ctx),
m_object_no(object_no), m_end_object_no(end_object_no), m_current_ops(0),
m_ret(0)
{
}
template <typename T>
void AsyncObjectThrottle<T>::start_ops(uint64_t max_concurrent) {
ceph_assert(m_image_ctx.owner_lock.is_locked());
bool complete;
{
Mutex::Locker l(m_lock);
for (uint64_t i = 0; i < max_concurrent; ++i) {
start_next_op();
if (m_ret < 0 && m_current_ops == 0) {
break;
}
}
complete = (m_current_ops == 0);
}
if (complete) {
// avoid re-entrant callback
m_image_ctx.op_work_queue->queue(m_ctx, m_ret);
delete this;
}
}
template <typename T>
void AsyncObjectThrottle<T>::finish_op(int r) {
bool complete;
{
RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
Mutex::Locker locker(m_lock);
--m_current_ops;
if (r < 0 && r != -ENOENT && m_ret == 0) {
m_ret = r;
}
start_next_op();
complete = (m_current_ops == 0);
}
if (complete) {
m_ctx->complete(m_ret);
delete this;
}
}
template <typename T>
void AsyncObjectThrottle<T>::start_next_op() {
bool done = false;
while (!done) {
if (m_async_request != NULL && m_async_request->is_canceled() &&
m_ret == 0) {
// allow in-flight ops to complete, but don't start new ops
m_ret = -ERESTART;
return;
} else if (m_ret != 0 || m_object_no >= m_end_object_no) {
return;
}
uint64_t ono = m_object_no++;
C_AsyncObjectThrottle<T> *ctx = m_context_factory(*this, ono);
int r = ctx->send();
if (r < 0) {
m_ret = r;
delete ctx;
return;
} else if (r > 0) {
// op completed immediately
delete ctx;
} else {
++m_current_ops;
done = true;
}
if (m_prog_ctx != NULL) {
r = m_prog_ctx->update_progress(ono, m_end_object_no);
if (r < 0) {
m_ret = r;
}
}
}
}
} // namespace librbd
#ifndef TEST_F
template class librbd::AsyncObjectThrottle<librbd::ImageCtx>;
#endif
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