--- /dev/null
+// -*- 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/ObjectRequest.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;
+ assert(image_ctx.owner_lock.is_locked());
+ 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 req = io::ObjectRequest<I>::create_trim(&image_ctx, oid, m_object_no,
+ m_snapc, false, this);
+ req->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;
+ assert(image_ctx.owner_lock.is_locked());
+ 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);
+ 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 = 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;
+ assert(false);
+ break;
+ }
+ return false;
+}
+
+template <typename I>
+void TrimRequest<I>::send() {
+ send_pre_trim();
+}
+
+template<typename I>
+void TrimRequest<I>::send_pre_trim() {
+ I &image_ctx = this->m_image_ctx;
+ 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;
+
+ 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, {}, this)) {
+ return;
+ }
+ }
+ }
+
+ send_copyup_objects();
+}
+
+template<typename I>
+void TrimRequest<I>::send_copyup_objects() {
+ I &image_ctx = this->m_image_ctx;
+ 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);
+ 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.concurrent_management_ops);
+}
+
+template <typename I>
+void TrimRequest<I>::send_remove_objects() {
+ I &image_ctx = this->m_image_ctx;
+ 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.concurrent_management_ops);
+}
+
+template<typename I>
+void TrimRequest<I>::send_post_trim() {
+ I &image_ctx = this->m_image_ctx;
+ 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;
+
+ 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, {}, this)) {
+ return;
+ }
+ }
+ }
+
+ send_clean_boundary();
+}
+
+template <typename I>
+void TrimRequest<I>::send_clean_boundary() {
+ I &image_ctx = this->m_image_ctx;
+ 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
+ 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);
+
+ io::ObjectRequest<I> *req;
+ if (p->offset == 0) {
+ req = io::ObjectRequest<I>::create_trim(&image_ctx, p->oid.name,
+ p->objectno, snapc, true,
+ req_comp);
+ } else {
+ req = io::ObjectRequest<I>::create_truncate(&image_ctx, p->oid.name,
+ p->objectno, p->offset, snapc,
+ {}, req_comp);
+ }
+ req->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>;
Code Review / stor4nfv.git / blobdiff