--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/operation/FlattenRequest.h"
+#include "librbd/AsyncObjectThrottle.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/io/ObjectRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include <boost/lambda/bind.hpp>
+#include <boost/lambda/construct.hpp>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::FlattenRequest: "
+
+namespace librbd {
+namespace operation {
+
+template <typename I>
+class C_FlattenObject : public C_AsyncObjectThrottle<I> {
+public:
+ C_FlattenObject(AsyncObjectThrottle<I> &throttle, I *image_ctx,
+ uint64_t object_size, ::SnapContext snapc, uint64_t object_no)
+ : C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_object_size(object_size),
+ 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());
+ CephContext *cct = image_ctx.cct;
+
+ if (image_ctx.exclusive_lock != nullptr &&
+ !image_ctx.exclusive_lock->is_lock_owner()) {
+ ldout(cct, 1) << "lost exclusive lock during flatten" << dendl;
+ return -ERESTART;
+ }
+
+ bufferlist bl;
+ string oid = image_ctx.get_object_name(m_object_no);
+ auto req = new io::ObjectWriteRequest(&image_ctx, oid, m_object_no, 0,
+ bl, m_snapc, 0, {}, this);
+ if (!req->has_parent()) {
+ // stop early if the parent went away - it just means
+ // another flatten finished first or the image was resized
+ delete req;
+ return 1;
+ }
+
+ req->send();
+ return 0;
+ }
+
+private:
+ uint64_t m_object_size;
+ ::SnapContext m_snapc;
+ uint64_t m_object_no;
+};
+
+template <typename I>
+bool FlattenRequest<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) << "flatten operation interrupted" << dendl;
+ return true;
+ } else if (r < 0 && !(r == -ENOENT && m_ignore_enoent) ) {
+ lderr(cct) << "flatten encountered an error: " << cpp_strerror(r) << dendl;
+ return true;
+ }
+
+ RWLock::RLocker owner_locker(image_ctx.owner_lock);
+ switch (m_state) {
+ case STATE_FLATTEN_OBJECTS:
+ ldout(cct, 5) << "FLATTEN_OBJECTS" << dendl;
+ return send_update_header();
+
+ case STATE_UPDATE_HEADER:
+ ldout(cct, 5) << "UPDATE_HEADER" << dendl;
+ return send_update_children();
+
+ case STATE_UPDATE_CHILDREN:
+ ldout(cct, 5) << "UPDATE_CHILDREN" << dendl;
+ return true;
+
+ default:
+ lderr(cct) << "invalid state: " << m_state << dendl;
+ assert(false);
+ break;
+ }
+ return false;
+}
+
+template <typename I>
+void FlattenRequest<I>::send_op() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " send" << dendl;
+
+ m_state = STATE_FLATTEN_OBJECTS;
+ typename AsyncObjectThrottle<I>::ContextFactory context_factory(
+ boost::lambda::bind(boost::lambda::new_ptr<C_FlattenObject<I> >(),
+ boost::lambda::_1, &image_ctx, m_object_size, m_snapc,
+ boost::lambda::_2));
+ AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>(
+ this, image_ctx, context_factory, this->create_callback_context(), &m_prog_ctx,
+ 0, m_overlap_objects);
+ throttle->start_ops(image_ctx.concurrent_management_ops);
+}
+
+template <typename I>
+bool FlattenRequest<I>::send_update_header() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+ CephContext *cct = image_ctx.cct;
+
+ ldout(cct, 5) << this << " send_update_header" << dendl;
+ m_state = STATE_UPDATE_HEADER;
+
+ // should have been canceled prior to releasing lock
+ assert(image_ctx.exclusive_lock == nullptr ||
+ image_ctx.exclusive_lock->is_lock_owner());
+
+ {
+ RWLock::RLocker parent_locker(image_ctx.parent_lock);
+ // stop early if the parent went away - it just means
+ // another flatten finished first, so this one is useless.
+ if (!image_ctx.parent) {
+ ldout(cct, 5) << "image already flattened" << dendl;
+ return true;
+ }
+ m_parent_spec = image_ctx.parent_md.spec;
+ }
+ m_ignore_enoent = true;
+
+ // remove parent from this (base) image
+ librados::ObjectWriteOperation op;
+ cls_client::remove_parent(&op);
+
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(image_ctx.header_oid,
+ rados_completion, &op);
+ assert(r == 0);
+ rados_completion->release();
+ return false;
+}
+
+template <typename I>
+bool FlattenRequest<I>::send_update_children() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+ CephContext *cct = image_ctx.cct;
+
+ // should have been canceled prior to releasing lock
+ assert(image_ctx.exclusive_lock == nullptr ||
+ image_ctx.exclusive_lock->is_lock_owner());
+
+ // if there are no snaps, remove from the children object as well
+ // (if snapshots remain, they have their own parent info, and the child
+ // will be removed when the last snap goes away)
+ RWLock::RLocker snap_locker(image_ctx.snap_lock);
+ if ((image_ctx.features & RBD_FEATURE_DEEP_FLATTEN) == 0 &&
+ !image_ctx.snaps.empty()) {
+ return true;
+ }
+
+ ldout(cct, 2) << "removing child from children list..." << dendl;
+ m_state = STATE_UPDATE_CHILDREN;
+
+ librados::ObjectWriteOperation op;
+ cls_client::remove_child(&op, m_parent_spec, image_ctx.id);
+
+ librados::AioCompletion *rados_completion = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(RBD_CHILDREN, rados_completion,
+ &op);
+ assert(r == 0);
+ rados_completion->release();
+ return false;
+}
+
+} // namespace operation
+} // namespace librbd
+
+template class librbd::operation::FlattenRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff