+++ /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