X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Ftools%2Frbd_mirror%2Fimage_replayer%2FPrepareLocalImageRequest.cc;fp=src%2Fceph%2Fsrc%2Ftools%2Frbd_mirror%2Fimage_replayer%2FPrepareLocalImageRequest.cc;h=4009dc10d4af6f86ea126ec2cdbf2d00ba606419;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc b/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc new file mode 100644 index 0000000..4009dc1 --- /dev/null +++ b/src/ceph/src/tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.cc @@ -0,0 +1,143 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.h" +#include "include/rados/librados.hpp" +#include "cls/rbd/cls_rbd_client.h" +#include "common/errno.h" +#include "librbd/ImageCtx.h" +#include "librbd/Journal.h" +#include "librbd/Utils.h" +#include "tools/rbd_mirror/Threads.h" +#include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h" +#include + +#define dout_context g_ceph_context +#define dout_subsys ceph_subsys_rbd_mirror +#undef dout_prefix +#define dout_prefix *_dout << "rbd::mirror::image_replayer::" \ + << "PrepareLocalImageRequest: " << this << " " \ + << __func__ << ": " + +namespace rbd { +namespace mirror { +namespace image_replayer { + +using librbd::util::create_context_callback; +using librbd::util::create_rados_callback; + +template +void PrepareLocalImageRequest::send() { + dout(20) << dendl; + get_local_image_id(); +} + +template +void PrepareLocalImageRequest::get_local_image_id() { + dout(20) << dendl; + + Context *ctx = create_context_callback< + PrepareLocalImageRequest, + &PrepareLocalImageRequest::handle_get_local_image_id>(this); + auto req = GetMirrorImageIdRequest::create(m_io_ctx, m_global_image_id, + m_local_image_id, ctx); + req->send(); +} + +template +void PrepareLocalImageRequest::handle_get_local_image_id(int r) { + dout(20) << "r=" << r << ", " + << "local_image_id=" << *m_local_image_id << dendl; + + if (r < 0) { + finish(r); + return; + } + + get_mirror_state(); +} + +template +void PrepareLocalImageRequest::get_mirror_state() { + dout(20) << dendl; + + librados::ObjectReadOperation op; + librbd::cls_client::mirror_image_get_start(&op, *m_local_image_id); + + m_out_bl.clear(); + librados::AioCompletion *aio_comp = create_rados_callback< + PrepareLocalImageRequest, + &PrepareLocalImageRequest::handle_get_mirror_state>(this); + int r = m_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl); + assert(r == 0); + aio_comp->release(); +} + +template +void PrepareLocalImageRequest::handle_get_mirror_state(int r) { + dout(20) << ": r=" << r << dendl; + + cls::rbd::MirrorImage mirror_image; + if (r == 0) { + bufferlist::iterator iter = m_out_bl.begin(); + r = librbd::cls_client::mirror_image_get_finish(&iter, &mirror_image); + } + + if (r < 0) { + derr << "failed to retrieve image mirror state: " << cpp_strerror(r) + << dendl; + finish(r); + return; + } + + // TODO save current mirror state to determine if we should + // delete a partially formed image + // (e.g. MIRROR_IMAGE_STATE_CREATING/DELETING) + + get_tag_owner(); +} + +template +void PrepareLocalImageRequest::get_tag_owner() { + // deduce the class type for the journal to support unit tests + using Journal = typename std::decay< + typename std::remove_pointer().journal)> + ::type>::type; + + dout(20) << dendl; + + Context *ctx = create_context_callback< + PrepareLocalImageRequest, + &PrepareLocalImageRequest::handle_get_tag_owner>(this); + Journal::get_tag_owner(m_io_ctx, *m_local_image_id, m_tag_owner, + m_work_queue, ctx); +} + +template +void PrepareLocalImageRequest::handle_get_tag_owner(int r) { + dout(20) << "r=" << r << ", " + << "tag_owner=" << *m_tag_owner << dendl; + + if (r < 0) { + derr << "failed to retrieve journal tag owner: " << cpp_strerror(r) + << dendl; + finish(r); + return; + } + + finish(0); +} + +template +void PrepareLocalImageRequest::finish(int r) { + dout(20) << "r=" << r << dendl; + + m_on_finish->complete(r); + delete this; +} + +} // namespace image_replayer +} // namespace mirror +} // namespace rbd + +template class rbd::mirror::image_replayer::PrepareLocalImageRequest;