+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "librbd/io/CopyupRequest.h"
-#include "common/ceph_context.h"
-#include "common/dout.h"
-#include "common/errno.h"
-#include "common/Mutex.h"
-
-#include "librbd/AsyncObjectThrottle.h"
-#include "librbd/ExclusiveLock.h"
-#include "librbd/ImageCtx.h"
-#include "librbd/ObjectMap.h"
-#include "librbd/Utils.h"
-#include "librbd/io/AioCompletion.h"
-#include "librbd/io/ImageRequest.h"
-#include "librbd/io/ObjectRequest.h"
-#include "librbd/io/ReadResult.h"
-
-#include <boost/bind.hpp>
-#include <boost/lambda/bind.hpp>
-#include <boost/lambda/construct.hpp>
-
-#define dout_subsys ceph_subsys_rbd
-#undef dout_prefix
-#define dout_prefix *_dout << "librbd::io::CopyupRequest: " << this \
- << " " << __func__ << ": "
-
-namespace librbd {
-namespace io {
-
-namespace {
-
-class UpdateObjectMap : public C_AsyncObjectThrottle<> {
-public:
- UpdateObjectMap(AsyncObjectThrottle<> &throttle, ImageCtx *image_ctx,
- uint64_t object_no, const std::vector<uint64_t> *snap_ids,
- const ZTracer::Trace &trace, size_t snap_id_idx)
- : C_AsyncObjectThrottle(throttle, *image_ctx), m_object_no(object_no),
- m_snap_ids(*snap_ids), m_trace(trace), m_snap_id_idx(snap_id_idx)
- {
- }
-
- int send() override {
- uint64_t snap_id = m_snap_ids[m_snap_id_idx];
- if (snap_id == CEPH_NOSNAP) {
- RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
- RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
- assert(m_image_ctx.exclusive_lock->is_lock_owner());
- assert(m_image_ctx.object_map != nullptr);
- bool sent = m_image_ctx.object_map->aio_update<Context>(
- CEPH_NOSNAP, m_object_no, OBJECT_EXISTS, {}, m_trace, this);
- return (sent ? 0 : 1);
- }
-
- uint8_t state = OBJECT_EXISTS;
- if (m_image_ctx.test_features(RBD_FEATURE_FAST_DIFF) &&
- m_snap_id_idx + 1 < m_snap_ids.size()) {
- state = OBJECT_EXISTS_CLEAN;
- }
-
- RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
- RWLock::RLocker object_map_locker(m_image_ctx.object_map_lock);
- if (m_image_ctx.object_map == nullptr) {
- return 1;
- }
-
- bool sent = m_image_ctx.object_map->aio_update<Context>(
- snap_id, m_object_no, state, {}, m_trace, this);
- assert(sent);
- return 0;
- }
-
-private:
- uint64_t m_object_no;
- const std::vector<uint64_t> &m_snap_ids;
- const ZTracer::Trace &m_trace;
- size_t m_snap_id_idx;
-};
-
-} // anonymous namespace
-
-
-CopyupRequest::CopyupRequest(ImageCtx *ictx, const std::string &oid,
- uint64_t objectno, Extents &&image_extents,
- const ZTracer::Trace &parent_trace)
- : m_ictx(ictx), m_oid(oid), m_object_no(objectno),
- m_image_extents(image_extents),
- m_trace(util::create_trace(*m_ictx, "copy-up", parent_trace)),
- m_state(STATE_READ_FROM_PARENT)
-{
- m_async_op.start_op(*m_ictx);
-}
-
-CopyupRequest::~CopyupRequest() {
- assert(m_pending_requests.empty());
- m_async_op.finish_op();
-}
-
-void CopyupRequest::append_request(ObjectRequest<> *req) {
- ldout(m_ictx->cct, 20) << req << dendl;
- m_pending_requests.push_back(req);
-}
-
-void CopyupRequest::complete_requests(int r) {
- while (!m_pending_requests.empty()) {
- vector<ObjectRequest<> *>::iterator it = m_pending_requests.begin();
- ObjectRequest<> *req = *it;
- ldout(m_ictx->cct, 20) << "completing request " << req << dendl;
- req->complete(r);
- m_pending_requests.erase(it);
- }
-}
-
-bool CopyupRequest::send_copyup() {
- bool add_copyup_op = !m_copyup_data.is_zero();
- bool copy_on_read = m_pending_requests.empty();
- if (!add_copyup_op && copy_on_read) {
- // copyup empty object to prevent future CoR attempts
- m_copyup_data.clear();
- add_copyup_op = true;
- }
-
- ldout(m_ictx->cct, 20) << "oid " << m_oid << dendl;
- m_state = STATE_COPYUP;
-
- m_ictx->snap_lock.get_read();
- ::SnapContext snapc = m_ictx->snapc;
- m_ictx->snap_lock.put_read();
-
- std::vector<librados::snap_t> snaps;
-
- if (!copy_on_read) {
- m_pending_copyups++;
- }
-
- int r;
- if (copy_on_read || (!snapc.snaps.empty() && add_copyup_op)) {
- assert(add_copyup_op);
- add_copyup_op = false;
-
- librados::ObjectWriteOperation copyup_op;
- copyup_op.exec("rbd", "copyup", m_copyup_data);
-
- // send only the copyup request with a blank snapshot context so that
- // all snapshots are detected from the parent for this object. If
- // this is a CoW request, a second request will be created for the
- // actual modification.
- m_pending_copyups++;
-
- ldout(m_ictx->cct, 20) << "copyup with empty snapshot context" << dendl;
- librados::AioCompletion *comp = util::create_rados_callback(this);
-
- librados::Rados rados(m_ictx->data_ctx);
- r = rados.ioctx_create2(m_ictx->data_ctx.get_id(), m_data_ctx);
- assert(r == 0);
-
- r = m_data_ctx.aio_operate(
- m_oid, comp, ©up_op, 0, snaps,
- (m_trace.valid() ? m_trace.get_info() : nullptr));
- assert(r == 0);
- comp->release();
- }
-
- if (!copy_on_read) {
- librados::ObjectWriteOperation write_op;
- if (add_copyup_op) {
- // CoW did not need to handle existing snapshots
- write_op.exec("rbd", "copyup", m_copyup_data);
- }
-
- // merge all pending write ops into this single RADOS op
- for (size_t i=0; i<m_pending_requests.size(); ++i) {
- ObjectRequest<> *req = m_pending_requests[i];
- ldout(m_ictx->cct, 20) << "add_copyup_ops " << req << dendl;
- bool set_hints = (i == 0);
- req->add_copyup_ops(&write_op, set_hints);
- }
- assert(write_op.size() != 0);
-
- snaps.insert(snaps.end(), snapc.snaps.begin(), snapc.snaps.end());
- librados::AioCompletion *comp = util::create_rados_callback(this);
- r = m_ictx->data_ctx.aio_operate(
- m_oid, comp, &write_op, snapc.seq, snaps,
- (m_trace.valid() ? m_trace.get_info() : nullptr));
- assert(r == 0);
- comp->release();
- }
- return false;
-}
-
-bool CopyupRequest::is_copyup_required() {
- bool noop = true;
- for (const ObjectRequest<> *req : m_pending_requests) {
- if (!req->is_op_payload_empty()) {
- noop = false;
- break;
- }
- }
-
- return (m_copyup_data.is_zero() && noop);
-}
-
-void CopyupRequest::send()
-{
- m_state = STATE_READ_FROM_PARENT;
- AioCompletion *comp = AioCompletion::create_and_start(
- this, m_ictx, AIO_TYPE_READ);
-
- ldout(m_ictx->cct, 20) << "completion " << comp
- << ", oid " << m_oid
- << ", extents " << m_image_extents
- << dendl;
- ImageRequest<>::aio_read(m_ictx->parent, comp, std::move(m_image_extents),
- ReadResult{&m_copyup_data}, 0, m_trace);
-}
-
-void CopyupRequest::complete(int r)
-{
- if (should_complete(r)) {
- complete_requests(r);
- delete this;
- }
-}
-
-bool CopyupRequest::should_complete(int r)
-{
- CephContext *cct = m_ictx->cct;
- ldout(cct, 20) << "oid " << m_oid
- << ", r " << r << dendl;
-
- uint64_t pending_copyups;
- switch (m_state) {
- case STATE_READ_FROM_PARENT:
- ldout(cct, 20) << "READ_FROM_PARENT" << dendl;
- remove_from_list();
- if (r >= 0 || r == -ENOENT) {
- if (is_copyup_required()) {
- ldout(cct, 20) << "nop, skipping" << dendl;
- return true;
- }
-
- return send_object_map_head();
- }
- break;
-
- case STATE_OBJECT_MAP_HEAD:
- ldout(cct, 20) << "OBJECT_MAP_HEAD" << dendl;
- assert(r == 0);
- return send_object_map();
-
- case STATE_OBJECT_MAP:
- ldout(cct, 20) << "OBJECT_MAP" << dendl;
- assert(r == 0);
- return send_copyup();
-
- case STATE_COPYUP:
- // invoked via a finisher in librados, so thread safe
- pending_copyups = --m_pending_copyups;
- ldout(cct, 20) << "COPYUP (" << pending_copyups << " pending)"
- << dendl;
- if (r == -ENOENT) {
- // hide the -ENOENT error if this is the last op
- if (pending_copyups == 0) {
- complete_requests(0);
- }
- } else if (r < 0) {
- complete_requests(r);
- }
- return (pending_copyups == 0);
-
- default:
- lderr(cct) << "invalid state: " << m_state << dendl;
- assert(false);
- break;
- }
- return (r < 0);
-}
-
-void CopyupRequest::remove_from_list()
-{
- Mutex::Locker l(m_ictx->copyup_list_lock);
-
- map<uint64_t, CopyupRequest*>::iterator it =
- m_ictx->copyup_list.find(m_object_no);
- assert(it != m_ictx->copyup_list.end());
- m_ictx->copyup_list.erase(it);
-}
-
-bool CopyupRequest::send_object_map_head() {
- CephContext *cct = m_ictx->cct;
- ldout(cct, 20) << dendl;
-
- m_state = STATE_OBJECT_MAP_HEAD;
-
- {
- RWLock::RLocker owner_locker(m_ictx->owner_lock);
- RWLock::RLocker snap_locker(m_ictx->snap_lock);
- if (m_ictx->object_map != nullptr) {
- bool copy_on_read = m_pending_requests.empty();
- assert(m_ictx->exclusive_lock->is_lock_owner());
-
- RWLock::WLocker object_map_locker(m_ictx->object_map_lock);
- if (!m_ictx->snaps.empty()) {
- m_snap_ids.insert(m_snap_ids.end(), m_ictx->snaps.begin(),
- m_ictx->snaps.end());
- }
- if (copy_on_read &&
- (*m_ictx->object_map)[m_object_no] != OBJECT_EXISTS) {
- m_snap_ids.insert(m_snap_ids.begin(), CEPH_NOSNAP);
- object_map_locker.unlock();
- snap_locker.unlock();
- owner_locker.unlock();
- return send_object_map();
- }
-
- bool may_update = false;
- uint8_t new_state, current_state;
-
- vector<ObjectRequest<> *>::reverse_iterator r_it = m_pending_requests.rbegin();
- for (; r_it != m_pending_requests.rend(); ++r_it) {
- ObjectRequest<> *req = *r_it;
- if (!req->pre_object_map_update(&new_state)) {
- continue;
- }
-
- current_state = (*m_ictx->object_map)[m_object_no];
- ldout(cct, 20) << req->get_op_type() << " object no "
- << m_object_no << " current state "
- << stringify(static_cast<uint32_t>(current_state))
- << " new state " << stringify(static_cast<uint32_t>(new_state))
- << dendl;
- may_update = true;
- break;
- }
-
- if (may_update && (new_state != current_state) &&
- m_ictx->object_map->aio_update<CopyupRequest>(
- CEPH_NOSNAP, m_object_no, new_state, current_state, m_trace,
- this)) {
- return false;
- }
- }
- }
-
- return send_object_map();
-}
-
-bool CopyupRequest::send_object_map() {
- // avoid possible recursive lock attempts
- if (m_snap_ids.empty()) {
- // no object map update required
- return send_copyup();
- } else {
- // update object maps for HEAD and all existing snapshots
- ldout(m_ictx->cct, 20) << "oid " << m_oid << dendl;
- m_state = STATE_OBJECT_MAP;
-
- RWLock::RLocker owner_locker(m_ictx->owner_lock);
- AsyncObjectThrottle<>::ContextFactory context_factory(
- boost::lambda::bind(boost::lambda::new_ptr<UpdateObjectMap>(),
- boost::lambda::_1, m_ictx, m_object_no, &m_snap_ids, m_trace,
- boost::lambda::_2));
- AsyncObjectThrottle<> *throttle = new AsyncObjectThrottle<>(
- NULL, *m_ictx, context_factory, util::create_context_callback(this),
- NULL, 0, m_snap_ids.size());
- throttle->start_ops(m_ictx->concurrent_management_ops);
- }
- return false;
-}
-
-} // namespace io
-} // namespace librbd
Code Review / stor4nfv.git / blobdiff