X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Fimage%2FCloneRequest.cc;fp=src%2Fceph%2Fsrc%2Flibrbd%2Fimage%2FCloneRequest.cc;h=3753b94f85f95f160b681466b919b6686da34f7a;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/librbd/image/CloneRequest.cc b/src/ceph/src/librbd/image/CloneRequest.cc
new file mode 100644
index 0000000..3753b94
--- /dev/null
+++ b/src/ceph/src/librbd/image/CloneRequest.cc
@@ -0,0 +1,568 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "cls/rbd/cls_rbd_client.h"
+#include "cls/rbd/cls_rbd_types.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "include/assert.h"
+#include "librbd/ImageState.h"
+#include "librbd/Journal.h"
+#include "librbd/image/CloneRequest.h"
+#include "librbd/image/CreateRequest.h"
+#include "librbd/image/RemoveRequest.h"
+#include "librbd/image/RefreshRequest.h"
+#include "librbd/mirror/EnableRequest.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::image::CloneRequest: "
+
+namespace librbd {
+namespace image {
+
+using util::create_rados_callback;
+using util::create_context_callback;
+using util::create_async_context_callback;
+
+template <typename I>
+CloneRequest<I>::CloneRequest(I *p_imctx, IoCtx &c_ioctx,
+			      const std::string &c_name,
+			      const std::string &c_id,
+			      ImageOptions c_options,
+			      const std::string &non_primary_global_image_id,
+			      const std::string &primary_mirror_uuid,
+			      ContextWQ *op_work_queue, Context *on_finish)
+  : m_p_imctx(p_imctx), m_ioctx(c_ioctx), m_name(c_name), m_id(c_id),
+    m_opts(c_options),
+    m_pspec(m_p_imctx->md_ctx.get_id(), m_p_imctx->id, m_p_imctx->snap_id),
+    m_non_primary_global_image_id(non_primary_global_image_id),
+    m_primary_mirror_uuid(primary_mirror_uuid),
+    m_op_work_queue(op_work_queue), m_on_finish(on_finish),
+    m_use_p_features(true) {
+
+  m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
+
+  bool default_format_set;
+  m_opts.is_set(RBD_IMAGE_OPTION_FORMAT, &default_format_set);
+  if (!default_format_set) {
+    m_opts.set(RBD_IMAGE_OPTION_FORMAT, static_cast<uint64_t>(2));
+  }
+
+  ldout(m_cct, 20) << "clone " << &m_p_imctx->md_ctx << " name " << m_p_imctx->name
+		 << " snap " << m_p_imctx->snap_name << " to child " << &m_ioctx
+		 << " name " << m_name << " opts = " << &m_opts << dendl;
+  return;
+}
+
+template <typename I>
+void CloneRequest<I>::send() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+  validate_options();
+}
+
+template <typename I>
+void CloneRequest<I>::validate_options() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  uint64_t format = 0;
+  m_opts.get(RBD_IMAGE_OPTION_FORMAT, &format);
+  if (format < 2) {
+    lderr(m_cct) << "format 2 or later required for clone" << dendl;
+    return complete(-EINVAL);
+  }
+
+  if (m_opts.get(RBD_IMAGE_OPTION_FEATURES, &m_features) == 0) {
+    if (m_features & ~RBD_FEATURES_ALL) {
+      lderr(m_cct) << "librbd does not support requested features" << dendl;
+      return complete(-ENOSYS);
+    }
+    m_use_p_features = false;
+  }
+
+  send_validate_parent();
+}
+
+template <typename I>
+void CloneRequest<I>::send_validate_parent() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (m_p_imctx->snap_id == CEPH_NOSNAP) {
+    lderr(m_cct) << "image to be cloned must be a snapshot" << dendl;
+    return complete(-EINVAL);
+  }
+
+  if (m_p_imctx->old_format) {
+    lderr(m_cct) << "parent image must be in new format" << dendl;
+    return complete(-EINVAL);
+  }
+
+  int r = 0;
+  bool snap_protected;
+  m_p_imctx->snap_lock.get_read();
+  m_p_features = m_p_imctx->features;
+  m_size = m_p_imctx->get_image_size(m_p_imctx->snap_id);
+  r = m_p_imctx->is_snap_protected(m_p_imctx->snap_id, &snap_protected);
+  m_p_imctx->snap_lock.put_read();
+
+  if ((m_p_features & RBD_FEATURE_LAYERING) != RBD_FEATURE_LAYERING) {
+    lderr(m_cct) << "parent image must support layering" << dendl;
+    return complete(-ENOSYS);
+  }
+
+  if (r < 0) {
+    lderr(m_cct) << "unable to locate parent's snapshot" << dendl;
+    return complete(r);
+  }
+
+  if (!snap_protected) {
+    lderr(m_cct) << "parent snapshot must be protected" << dendl;
+    return complete(-EINVAL);
+  }
+
+  if ((m_p_features & RBD_FEATURE_JOURNALING) != 0) {
+    m_force_non_primary = !m_non_primary_global_image_id.empty();
+    using klass = CloneRequest<I>;
+    Context *ctx = create_context_callback<
+	klass, &klass::handle_validate_parent>(this);
+
+    Journal<I>::is_tag_owner(m_p_imctx, &m_is_primary, ctx);
+    return;
+  }
+
+  send_validate_child();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_validate_parent(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "failed to determine tag ownership: " << cpp_strerror(r)
+	       << dendl;
+    return complete(r);
+  }
+
+  if ((m_p_features & RBD_FEATURE_JOURNALING) != 0) {
+    if (!m_is_primary && !m_force_non_primary) {
+      lderr(m_cct) << "parent is non-primary mirrored image" << dendl;
+      return complete(-EINVAL);
+    }
+  }
+
+  send_validate_child();
+}
+
+template <typename I>
+void CloneRequest<I>::send_validate_child() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp = create_rados_callback<klass, &klass::handle_validate_child>(this);
+
+  librados::ObjectReadOperation op;
+  op.stat(NULL, NULL, NULL);
+
+  int r = m_ioctx.aio_operate(util::old_header_name(m_name), comp, &op, &m_out_bl);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_validate_child(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r != -ENOENT) {
+    lderr(m_cct) << "rbd image " << m_name << " already exists" << dendl;
+    return complete(r);
+  }
+
+  send_create();
+}
+
+template <typename I>
+void CloneRequest<I>::send_create() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (m_use_p_features) {
+    m_features = m_p_features;
+  }
+
+  uint64_t order = m_p_imctx->order;
+  if (m_opts.get(RBD_IMAGE_OPTION_ORDER, &order) != 0) {
+    m_opts.set(RBD_IMAGE_OPTION_ORDER, order);
+  }
+  if ((m_features & RBD_FEATURE_LAYERING) != RBD_FEATURE_LAYERING) {
+    lderr(m_cct) << "cloning image must support layering" << dendl;
+    return complete(-ENOSYS);
+  }
+  m_opts.set(RBD_IMAGE_OPTION_FEATURES, m_features);
+
+  using klass = CloneRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_create>(this);
+
+  RWLock::RLocker snap_locker(m_p_imctx->snap_lock);
+  CreateRequest<I> *req = CreateRequest<I>::create(
+    m_ioctx, m_name, m_id, m_size, m_opts, m_non_primary_global_image_id,
+    m_primary_mirror_uuid, true, m_op_work_queue, ctx);
+  req->send();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_create(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "error creating child: " << cpp_strerror(r) << dendl;
+    return complete(r);
+  }
+  send_open();
+}
+
+template <typename I>
+void CloneRequest<I>::send_open() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  m_imctx = I::create(m_name, "", NULL, m_ioctx, false);
+
+  using klass = CloneRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_open>(this);
+
+  m_imctx->state->open(true, ctx);
+}
+
+template <typename I>
+void CloneRequest<I>::handle_open(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "Error opening new image: " << cpp_strerror(r) << dendl;
+    m_r_saved = r;
+    return send_remove();
+  }
+
+  send_set_parent();
+}
+
+template <typename I>
+void CloneRequest<I>::send_set_parent() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  librados::ObjectWriteOperation op;
+  librbd::cls_client::set_parent(&op, m_pspec, m_size);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_set_parent>(this);
+  int r = m_imctx->md_ctx.aio_operate(m_imctx->header_oid,
+                                                comp, &op);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_set_parent(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "couldn't set parent: " << cpp_strerror(r) << dendl;
+    m_r_saved = r;
+    return send_close();
+  }
+
+  send_add_child();
+}
+
+template <typename I>
+void CloneRequest<I>::send_add_child() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  librados::ObjectWriteOperation op;
+  cls_client::add_child(&op, m_pspec, m_id);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_add_child>(this);
+  int r = m_ioctx.aio_operate(RBD_CHILDREN, comp, &op);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_add_child(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "couldn't add child: " << cpp_strerror(r) << dendl;
+    m_r_saved = r;
+    return send_close();
+  }
+
+  send_refresh();
+}
+
+template <typename I>
+void CloneRequest<I>::send_refresh() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CloneRequest<I>;
+  RefreshRequest<I> *req = RefreshRequest<I>::create(
+    *m_imctx, false, false,
+    create_context_callback<klass, &klass::handle_refresh>(this));
+  req->send();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_refresh(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  bool snap_protected = false;
+  if (r == 0) {
+    m_p_imctx->snap_lock.get_read();
+    r = m_p_imctx->is_snap_protected(m_p_imctx->snap_id, &snap_protected);
+    m_p_imctx->snap_lock.put_read();
+  }
+
+  if (r < 0 || !snap_protected) {
+    m_r_saved = -EINVAL;
+    return send_close();
+  }
+
+  send_metadata_list();
+}
+
+template <typename I>
+void CloneRequest<I>::send_metadata_list() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  librados::ObjectReadOperation op;
+  cls_client::metadata_list_start(&op, "", 0);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_metadata_list>(this);
+  m_out_bl.clear();
+  m_p_imctx->md_ctx.aio_operate(m_p_imctx->header_oid,
+				comp, &op, &m_out_bl);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_metadata_list(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r == 0) {
+    bufferlist::iterator it = m_out_bl.begin();
+    r = cls_client::metadata_list_finish(&it, &m_pairs);
+  }
+
+  if (r < 0 && r != -EOPNOTSUPP && r != -EIO) {
+    lderr(m_cct) << "couldn't list metadata: " << cpp_strerror(r) << dendl;
+    m_r_saved = r;
+    send_remove_child();
+  } else if (r == 0 && !m_pairs.empty()) {
+    send_metadata_set();
+  } else {
+    get_mirror_mode();
+  }
+}
+
+template <typename I>
+void CloneRequest<I>::send_metadata_set() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  librados::ObjectWriteOperation op;
+  cls_client::metadata_set(&op, m_pairs);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_metadata_set>(this);
+  int r = m_ioctx.aio_operate(m_imctx->header_oid, comp, &op);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_metadata_set(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "couldn't set metadata: " << cpp_strerror(r) << dendl;
+    m_r_saved = r;
+    send_remove_child();
+  } else {
+    get_mirror_mode();
+  }
+}
+
+template <typename I>
+void CloneRequest<I>::get_mirror_mode() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  if (!m_imctx->test_features(RBD_FEATURE_JOURNALING)) {
+    send_close();
+    return;
+  }
+
+  librados::ObjectReadOperation op;
+  cls_client::mirror_mode_get_start(&op);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_get_mirror_mode>(this);
+  m_out_bl.clear();
+  m_imctx->md_ctx.aio_operate(RBD_MIRRORING,
+			      comp, &op, &m_out_bl);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_get_mirror_mode(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r == 0) {
+    bufferlist::iterator it = m_out_bl.begin();
+    r = cls_client::mirror_mode_get_finish(&it, &m_mirror_mode);
+  }
+
+  if (r < 0 && r != -ENOENT) {
+    lderr(m_cct) << "failed to retrieve mirror mode: " << cpp_strerror(r)
+                 << dendl;
+
+    m_r_saved = r;
+    send_remove_child();
+  } else {
+    if (m_mirror_mode == cls::rbd::MIRROR_MODE_POOL ||
+	!m_non_primary_global_image_id.empty()) {
+      send_enable_mirror();
+    } else {
+      send_close();
+    }
+  }
+}
+
+template <typename I>
+void CloneRequest<I>::send_enable_mirror() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CloneRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_enable_mirror>(this);
+
+  mirror::EnableRequest<I> *req = mirror::EnableRequest<I>::create(
+    m_imctx->md_ctx, m_id, m_non_primary_global_image_id,
+    m_imctx->op_work_queue, ctx);
+  req->send();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_enable_mirror(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "failed to enable mirroring: " << cpp_strerror(r)
+               << dendl;
+    m_r_saved = r;
+    send_remove_child();
+  } else {
+    send_close();
+  }
+}
+
+template <typename I>
+void CloneRequest<I>::send_close() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  assert(m_imctx != nullptr);
+
+  using klass = CloneRequest<I>;
+  Context *ctx = create_async_context_callback(
+    *m_imctx, create_context_callback<
+      klass, &klass::handle_close>(this));
+  m_imctx->state->close(ctx);
+}
+
+template <typename I>
+void CloneRequest<I>::handle_close(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  m_imctx->destroy();
+  m_imctx = nullptr;
+
+  if (r < 0) {
+    lderr(m_cct) << "couldn't close image: " << cpp_strerror(r) << dendl;
+    return complete(r);
+  }
+
+  if (m_r_saved == 0) {
+    complete(0);
+  } else {
+    send_remove();
+  }
+}
+
+template <typename I>
+void CloneRequest<I>::send_remove_child() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  librados::ObjectWriteOperation op;
+  cls_client::remove_child(&op, m_pspec, m_id);
+
+  using klass = CloneRequest<I>;
+  librados::AioCompletion *comp =
+    create_rados_callback<klass, &klass::handle_remove_child>(this);
+  int r = m_p_imctx->md_ctx.aio_operate(RBD_CHILDREN, comp, &op);
+  assert(r == 0);
+  comp->release();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_remove_child(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+     lderr(m_cct) << "Error removing failed clone from list of children: "
+		  << cpp_strerror(r) << dendl;
+  }
+
+  send_close();
+}
+
+template <typename I>
+void CloneRequest<I>::send_remove() {
+  ldout(m_cct, 20) << this << " " << __func__ << dendl;
+
+  using klass = CloneRequest<I>;
+  Context *ctx = create_context_callback<klass, &klass::handle_remove>(this);
+
+  librbd::image::RemoveRequest<> *req = librbd::image::RemoveRequest<>::create(
+   m_ioctx, m_name, m_id, false, false, m_no_op, m_op_work_queue, ctx);
+  req->send();
+}
+
+template <typename I>
+void CloneRequest<I>::handle_remove(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(m_cct) << "Error removing failed clone: "
+		 << cpp_strerror(r) << dendl;
+  }
+  complete(r);
+}
+
+template <typename I>
+void CloneRequest<I>::complete(int r) {
+  ldout(m_cct, 20) << this << " " << __func__ << " r=" << r << dendl;
+
+  if (r == 0) {
+    ldout(m_cct, 20) << "done." << dendl;
+  }
+
+  m_on_finish->complete(r);
+  delete this;
+}
+
+} //namespace image
+} //namespace librbd
+
+template class librbd::image::CloneRequest<librbd::ImageCtx>;