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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/io/AioCompletion.h"
#include <errno.h>
#include "common/ceph_context.h"
#include "common/dout.h"
#include "common/errno.h"
#include "common/perf_counters.h"
#include "common/WorkQueue.h"
#include "librbd/ImageCtx.h"
#include "librbd/internal.h"
#include "librbd/Journal.h"
#include "librbd/Types.h"
#ifdef WITH_LTTNG
#include "tracing/librbd.h"
#else
#define tracepoint(...)
#endif
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::io::AioCompletion: " << this \
<< " " << __func__ << ": "
namespace librbd {
namespace io {
int AioCompletion::wait_for_complete() {
tracepoint(librbd, aio_wait_for_complete_enter, this);
lock.Lock();
while (state != AIO_STATE_COMPLETE)
cond.Wait(lock);
lock.Unlock();
tracepoint(librbd, aio_wait_for_complete_exit, 0);
return 0;
}
void AioCompletion::finalize(ssize_t rval)
{
ceph_assert(lock.is_locked());
ceph_assert(ictx != nullptr);
CephContext *cct = ictx->cct;
ldout(cct, 20) << "r=" << rval << dendl;
if (rval >= 0 && aio_type == AIO_TYPE_READ) {
read_result.assemble_result(cct);
}
}
void AioCompletion::complete() {
ceph_assert(lock.is_locked());
ceph_assert(ictx != nullptr);
CephContext *cct = ictx->cct;
tracepoint(librbd, aio_complete_enter, this, rval);
if (ictx->perfcounter != nullptr) {
ceph::timespan elapsed = coarse_mono_clock::now() - start_time;
switch (aio_type) {
case AIO_TYPE_GENERIC:
case AIO_TYPE_OPEN:
case AIO_TYPE_CLOSE:
break;
case AIO_TYPE_READ:
ictx->perfcounter->tinc(l_librbd_rd_latency, elapsed); break;
case AIO_TYPE_WRITE:
ictx->perfcounter->tinc(l_librbd_wr_latency, elapsed); break;
case AIO_TYPE_DISCARD:
ictx->perfcounter->tinc(l_librbd_discard_latency, elapsed); break;
case AIO_TYPE_FLUSH:
ictx->perfcounter->tinc(l_librbd_flush_latency, elapsed); break;
case AIO_TYPE_WRITESAME:
ictx->perfcounter->tinc(l_librbd_ws_latency, elapsed); break;
case AIO_TYPE_COMPARE_AND_WRITE:
ictx->perfcounter->tinc(l_librbd_cmp_latency, elapsed); break;
default:
lderr(cct) << "completed invalid aio_type: " << aio_type << dendl;
break;
}
}
if ((aio_type == AIO_TYPE_CLOSE) ||
(aio_type == AIO_TYPE_OPEN && rval < 0)) {
// must destroy ImageCtx prior to invoking callback
delete ictx;
ictx = nullptr;
}
state = AIO_STATE_CALLBACK;
if (complete_cb) {
lock.Unlock();
complete_cb(rbd_comp, complete_arg);
lock.Lock();
}
if (ictx != nullptr && event_notify && ictx->event_socket.is_valid()) {
ictx->completed_reqs_lock.Lock();
ictx->completed_reqs.push_back(&m_xlist_item);
ictx->completed_reqs_lock.Unlock();
ictx->event_socket.notify();
}
state = AIO_STATE_COMPLETE;
cond.Signal();
// note: possible for image to be closed after op marked finished
if (async_op.started()) {
async_op.finish_op();
}
tracepoint(librbd, aio_complete_exit);
}
void AioCompletion::init_time(ImageCtx *i, aio_type_t t) {
Mutex::Locker locker(lock);
if (ictx == nullptr) {
ictx = i;
aio_type = t;
start_time = coarse_mono_clock::now();
}
}
void AioCompletion::start_op() {
Mutex::Locker locker(lock);
ceph_assert(ictx != nullptr);
if (aio_type == AIO_TYPE_OPEN || aio_type == AIO_TYPE_CLOSE) {
// no need to track async open/close operations
return;
}
ceph_assert(!async_op.started());
async_op.start_op(*ictx);
}
void AioCompletion::fail(int r)
{
lock.Lock();
ceph_assert(ictx != nullptr);
CephContext *cct = ictx->cct;
lderr(cct) << cpp_strerror(r) << dendl;
ceph_assert(pending_count == 0);
rval = r;
complete();
put_unlock();
}
void AioCompletion::set_request_count(uint32_t count) {
lock.Lock();
ceph_assert(ictx != nullptr);
CephContext *cct = ictx->cct;
ldout(cct, 20) << "pending=" << count << dendl;
ceph_assert(pending_count == 0);
if (count > 0) {
pending_count = count;
lock.Unlock();
} else {
pending_count = 1;
lock.Unlock();
// ensure completion fires in clean lock context
ictx->op_work_queue->queue(new C_AioRequest(this), 0);
}
}
void AioCompletion::complete_request(ssize_t r)
{
lock.Lock();
ceph_assert(ictx != nullptr);
CephContext *cct = ictx->cct;
if (rval >= 0) {
if (r < 0 && r != -EEXIST)
rval = r;
else if (r > 0)
rval += r;
}
ceph_assert(pending_count);
int count = --pending_count;
ldout(cct, 20) << "cb=" << complete_cb << ", "
<< "pending=" << pending_count << dendl;
if (!count) {
finalize(rval);
complete();
}
put_unlock();
}
bool AioCompletion::is_complete() {
tracepoint(librbd, aio_is_complete_enter, this);
bool done;
{
Mutex::Locker l(lock);
done = this->state == AIO_STATE_COMPLETE;
}
tracepoint(librbd, aio_is_complete_exit, done);
return done;
}
ssize_t AioCompletion::get_return_value() {
tracepoint(librbd, aio_get_return_value_enter, this);
lock.Lock();
ssize_t r = rval;
lock.Unlock();
tracepoint(librbd, aio_get_return_value_exit, r);
return r;
}
} // namespace io
} // namespace librbd
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