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Diffstat (limited to '')
| -rw-r--r-- | src/librbd/operation/TrimRequest.cc | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/src/librbd/operation/TrimRequest.cc b/src/librbd/operation/TrimRequest.cc new file mode 100644 index 00000000..15f6a5df --- /dev/null +++ b/src/librbd/operation/TrimRequest.cc @@ -0,0 +1,377 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "librbd/operation/TrimRequest.h" +#include "librbd/AsyncObjectThrottle.h" +#include "librbd/ExclusiveLock.h" +#include "librbd/ImageCtx.h" +#include "librbd/internal.h" +#include "librbd/ObjectMap.h" +#include "librbd/Utils.h" +#include "librbd/io/ObjectDispatchSpec.h" +#include "librbd/io/ObjectDispatcher.h" +#include "common/ContextCompletion.h" +#include "common/dout.h" +#include "common/errno.h" +#include "osdc/Striper.h" + +#include <boost/bind.hpp> +#include <boost/lambda/bind.hpp> +#include <boost/lambda/construct.hpp> +#include <boost/scope_exit.hpp> + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd::TrimRequest: " + +namespace librbd { +namespace operation { + +template <typename I> +class C_CopyupObject : public C_AsyncObjectThrottle<I> { +public: + C_CopyupObject(AsyncObjectThrottle<I> &throttle, I *image_ctx, + ::SnapContext snapc, uint64_t object_no) + : C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_snapc(snapc), + m_object_no(object_no) + { + } + + int send() override { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + ceph_assert(image_ctx.exclusive_lock == nullptr || + image_ctx.exclusive_lock->is_lock_owner()); + + string oid = image_ctx.get_object_name(m_object_no); + ldout(image_ctx.cct, 10) << "removing (with copyup) " << oid << dendl; + + auto object_dispatch_spec = io::ObjectDispatchSpec::create_discard( + &image_ctx, io::OBJECT_DISPATCH_LAYER_NONE, oid, m_object_no, 0, + image_ctx.layout.object_size, m_snapc, + io::OBJECT_DISCARD_FLAG_DISABLE_OBJECT_MAP_UPDATE, 0, {}, this); + object_dispatch_spec->send(); + return 0; + } +private: + ::SnapContext m_snapc; + uint64_t m_object_no; +}; + +template <typename I> +class C_RemoveObject : public C_AsyncObjectThrottle<I> { +public: + C_RemoveObject(AsyncObjectThrottle<I> &throttle, I *image_ctx, + uint64_t object_no) + : C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_object_no(object_no) + { + } + + int send() override { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + ceph_assert(image_ctx.exclusive_lock == nullptr || + image_ctx.exclusive_lock->is_lock_owner()); + + { + RWLock::RLocker snap_locker(image_ctx.snap_lock); + if (image_ctx.object_map != nullptr && + !image_ctx.object_map->object_may_exist(m_object_no)) { + return 1; + } + } + + string oid = image_ctx.get_object_name(m_object_no); + ldout(image_ctx.cct, 10) << "removing " << oid << dendl; + + librados::AioCompletion *rados_completion = + util::create_rados_callback(this); + int r = image_ctx.data_ctx.aio_remove(oid, rados_completion); + ceph_assert(r == 0); + rados_completion->release(); + return 0; + } + +private: + uint64_t m_object_no; +}; + +template <typename I> +TrimRequest<I>::TrimRequest(I &image_ctx, Context *on_finish, + uint64_t original_size, uint64_t new_size, + ProgressContext &prog_ctx) + : AsyncRequest<I>(image_ctx, on_finish), m_new_size(new_size), + m_prog_ctx(prog_ctx) +{ + uint64_t period = image_ctx.get_stripe_period(); + uint64_t new_num_periods = ((m_new_size + period - 1) / period); + m_delete_off = std::min(new_num_periods * period, original_size); + // first object we can delete free and clear + m_delete_start = new_num_periods * image_ctx.get_stripe_count(); + m_delete_start_min = m_delete_start; + m_num_objects = Striper::get_num_objects(image_ctx.layout, original_size); + + CephContext *cct = image_ctx.cct; + ldout(cct, 10) << this << " trim image " << original_size << " -> " + << m_new_size << " periods " << new_num_periods + << " discard to offset " << m_delete_off + << " delete objects " << m_delete_start + << " to " << m_num_objects << dendl; +} + +template <typename I> +bool TrimRequest<I>::should_complete(int r) +{ + I &image_ctx = this->m_image_ctx; + CephContext *cct = image_ctx.cct; + ldout(cct, 5) << this << " should_complete: r=" << r << dendl; + if (r == -ERESTART) { + ldout(cct, 5) << "trim operation interrupted" << dendl; + return true; + } else if (r < 0) { + lderr(cct) << "trim encountered an error: " << cpp_strerror(r) << dendl; + return true; + } + + RWLock::RLocker owner_lock(image_ctx.owner_lock); + switch (m_state) { + case STATE_PRE_TRIM: + ldout(cct, 5) << " PRE_TRIM" << dendl; + send_copyup_objects(); + break; + + case STATE_COPYUP_OBJECTS: + ldout(cct, 5) << " COPYUP_OBJECTS" << dendl; + send_remove_objects(); + break; + + case STATE_REMOVE_OBJECTS: + ldout(cct, 5) << " REMOVE_OBJECTS" << dendl; + send_post_trim(); + break; + + case STATE_POST_TRIM: + ldout(cct, 5) << " POST_TRIM" << dendl; + send_clean_boundary(); + break; + + case STATE_CLEAN_BOUNDARY: + ldout(cct, 5) << "CLEAN_BOUNDARY" << dendl; + send_finish(0); + break; + + case STATE_FINISHED: + ldout(cct, 5) << "FINISHED" << dendl; + return true; + + default: + lderr(cct) << "invalid state: " << m_state << dendl; + ceph_abort(); + break; + } + return false; +} + +template <typename I> +void TrimRequest<I>::send() { + I &image_ctx = this->m_image_ctx; + CephContext *cct = image_ctx.cct; + + if (!image_ctx.data_ctx.is_valid()) { + lderr(cct) << "missing data pool" << dendl; + send_finish(-ENODEV); + return; + } + + send_pre_trim(); +} + +template<typename I> +void TrimRequest<I>::send_pre_trim() { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + + if (m_delete_start >= m_num_objects) { + send_clean_boundary(); + return; + } + + { + RWLock::RLocker snap_locker(image_ctx.snap_lock); + if (image_ctx.object_map != nullptr) { + ldout(image_ctx.cct, 5) << this << " send_pre_trim: " + << " delete_start_min=" << m_delete_start_min + << " num_objects=" << m_num_objects << dendl; + m_state = STATE_PRE_TRIM; + + ceph_assert(image_ctx.exclusive_lock->is_lock_owner()); + + RWLock::WLocker object_map_locker(image_ctx.object_map_lock); + if (image_ctx.object_map->template aio_update<AsyncRequest<I> >( + CEPH_NOSNAP, m_delete_start_min, m_num_objects, OBJECT_PENDING, + OBJECT_EXISTS, {}, false, this)) { + return; + } + } + } + + send_copyup_objects(); +} + +template<typename I> +void TrimRequest<I>::send_copyup_objects() { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + + ::SnapContext snapc; + bool has_snapshots; + uint64_t parent_overlap; + { + RWLock::RLocker snap_locker(image_ctx.snap_lock); + RWLock::RLocker parent_locker(image_ctx.parent_lock); + + snapc = image_ctx.snapc; + has_snapshots = !image_ctx.snaps.empty(); + int r = image_ctx.get_parent_overlap(CEPH_NOSNAP, &parent_overlap); + ceph_assert(r == 0); + } + + // copyup is only required for portion of image that overlaps parent + uint64_t copyup_end = Striper::get_num_objects(image_ctx.layout, + parent_overlap); + + // TODO: protect against concurrent shrink and snap create? + // skip to remove if no copyup is required. + if (copyup_end <= m_delete_start || !has_snapshots) { + send_remove_objects(); + return; + } + + uint64_t copyup_start = m_delete_start; + m_delete_start = copyup_end; + + ldout(image_ctx.cct, 5) << this << " send_copyup_objects: " + << " start object=" << copyup_start << ", " + << " end object=" << copyup_end << dendl; + m_state = STATE_COPYUP_OBJECTS; + + Context *ctx = this->create_callback_context(); + typename AsyncObjectThrottle<I>::ContextFactory context_factory( + boost::lambda::bind(boost::lambda::new_ptr<C_CopyupObject<I> >(), + boost::lambda::_1, &image_ctx, snapc, boost::lambda::_2)); + AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>( + this, image_ctx, context_factory, ctx, &m_prog_ctx, copyup_start, + copyup_end); + throttle->start_ops( + image_ctx.config.template get_val<uint64_t>("rbd_concurrent_management_ops")); +} + +template <typename I> +void TrimRequest<I>::send_remove_objects() { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + + ldout(image_ctx.cct, 5) << this << " send_remove_objects: " + << " delete_start=" << m_delete_start + << " num_objects=" << m_num_objects << dendl; + m_state = STATE_REMOVE_OBJECTS; + + Context *ctx = this->create_callback_context(); + typename AsyncObjectThrottle<I>::ContextFactory context_factory( + boost::lambda::bind(boost::lambda::new_ptr<C_RemoveObject<I> >(), + boost::lambda::_1, &image_ctx, boost::lambda::_2)); + AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>( + this, image_ctx, context_factory, ctx, &m_prog_ctx, m_delete_start, + m_num_objects); + throttle->start_ops( + image_ctx.config.template get_val<uint64_t>("rbd_concurrent_management_ops")); +} + +template<typename I> +void TrimRequest<I>::send_post_trim() { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + + { + RWLock::RLocker snap_locker(image_ctx.snap_lock); + if (image_ctx.object_map != nullptr) { + ldout(image_ctx.cct, 5) << this << " send_post_trim:" + << " delete_start_min=" << m_delete_start_min + << " num_objects=" << m_num_objects << dendl; + m_state = STATE_POST_TRIM; + + ceph_assert(image_ctx.exclusive_lock->is_lock_owner()); + + RWLock::WLocker object_map_locker(image_ctx.object_map_lock); + if (image_ctx.object_map->template aio_update<AsyncRequest<I> >( + CEPH_NOSNAP, m_delete_start_min, m_num_objects, OBJECT_NONEXISTENT, + OBJECT_PENDING, {}, false, this)) { + return; + } + } + } + + send_clean_boundary(); +} + +template <typename I> +void TrimRequest<I>::send_clean_boundary() { + I &image_ctx = this->m_image_ctx; + ceph_assert(image_ctx.owner_lock.is_locked()); + CephContext *cct = image_ctx.cct; + if (m_delete_off <= m_new_size) { + send_finish(0); + return; + } + + // should have been canceled prior to releasing lock + ceph_assert(image_ctx.exclusive_lock == nullptr || + image_ctx.exclusive_lock->is_lock_owner()); + uint64_t delete_len = m_delete_off - m_new_size; + ldout(image_ctx.cct, 5) << this << " send_clean_boundary: " + << " delete_off=" << m_delete_off + << " length=" << delete_len << dendl; + m_state = STATE_CLEAN_BOUNDARY; + + ::SnapContext snapc; + { + RWLock::RLocker snap_locker(image_ctx.snap_lock); + snapc = image_ctx.snapc; + } + + // discard the weird boundary + std::vector<ObjectExtent> extents; + Striper::file_to_extents(cct, image_ctx.format_string, + &image_ctx.layout, m_new_size, delete_len, 0, + extents); + + ContextCompletion *completion = + new ContextCompletion(this->create_async_callback_context(), true); + for (vector<ObjectExtent>::iterator p = extents.begin(); + p != extents.end(); ++p) { + ldout(cct, 20) << " ex " << *p << dendl; + Context *req_comp = new C_ContextCompletion(*completion); + + if (p->offset == 0) { + // treat as a full object delete on the boundary + p->length = image_ctx.layout.object_size; + } + + auto object_dispatch_spec = io::ObjectDispatchSpec::create_discard( + &image_ctx, io::OBJECT_DISPATCH_LAYER_NONE, p->oid.name, p->objectno, + p->offset, p->length, snapc, 0, 0, {}, req_comp); + object_dispatch_spec->send(); + } + completion->finish_adding_requests(); +} + +template <typename I> +void TrimRequest<I>::send_finish(int r) { + m_state = STATE_FINISHED; + this->async_complete(r); +} + +} // namespace operation +} // namespace librbd + +template class librbd::operation::TrimRequest<librbd::ImageCtx>; |