+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "SnapshotCopyRequest.h"
-#include "SnapshotCreateRequest.h"
-#include "common/errno.h"
-#include "common/WorkQueue.h"
-#include "journal/Journaler.h"
-#include "librbd/ExclusiveLock.h"
-#include "librbd/Operations.h"
-#include "librbd/Utils.h"
-#include "librbd/journal/Types.h"
-
-#define dout_context g_ceph_context
-#define dout_subsys ceph_subsys_rbd_mirror
-#undef dout_prefix
-#define dout_prefix *_dout << "rbd::mirror::image_sync::SnapshotCopyRequest: " \
- << this << " " << __func__
-
-namespace rbd {
-namespace mirror {
-namespace image_sync {
-
-namespace {
-
-template <typename I>
-const std::string &get_snapshot_name(I *image_ctx, librados::snap_t snap_id) {
- auto snap_it = std::find_if(image_ctx->snap_ids.begin(),
- image_ctx->snap_ids.end(),
- [snap_id](
- const std::pair<
- std::pair<cls::rbd::SnapshotNamespace,
- std::string>,
- librados::snap_t> &pair) {
- return pair.second == snap_id;
- });
- assert(snap_it != image_ctx->snap_ids.end());
- return snap_it->first.second;
-}
-
-} // anonymous namespace
-
-using librbd::util::create_context_callback;
-using librbd::util::unique_lock_name;
-
-template <typename I>
-SnapshotCopyRequest<I>::SnapshotCopyRequest(I *local_image_ctx,
- I *remote_image_ctx,
- SnapMap *snap_map,
- Journaler *journaler,
- librbd::journal::MirrorPeerClientMeta *meta,
- ContextWQ *work_queue,
- Context *on_finish)
- : BaseRequest("rbd::mirror::image_sync::SnapshotCopyRequest",
- local_image_ctx->cct, on_finish),
- m_local_image_ctx(local_image_ctx), m_remote_image_ctx(remote_image_ctx),
- m_snap_map(snap_map), m_journaler(journaler), m_client_meta(meta),
- m_work_queue(work_queue), m_snap_seqs(meta->snap_seqs),
- m_lock(unique_lock_name("SnapshotCopyRequest::m_lock", this)) {
- m_snap_map->clear();
-
- // snap ids ordered from oldest to newest
- m_remote_snap_ids.insert(remote_image_ctx->snaps.begin(),
- remote_image_ctx->snaps.end());
- m_local_snap_ids.insert(local_image_ctx->snaps.begin(),
- local_image_ctx->snaps.end());
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send() {
- librbd::ParentSpec remote_parent_spec;
- int r = validate_parent(m_remote_image_ctx, &remote_parent_spec);
- if (r < 0) {
- derr << ": remote image parent spec mismatch" << dendl;
- error(r);
- return;
- }
-
- r = validate_parent(m_local_image_ctx, &m_local_parent_spec);
- if (r < 0) {
- derr << ": local image parent spec mismatch" << dendl;
- error(r);
- return;
- }
-
- send_snap_unprotect();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::cancel() {
- Mutex::Locker locker(m_lock);
-
- dout(20) << dendl;
- m_canceled = true;
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send_snap_unprotect() {
-
- SnapIdSet::iterator snap_id_it = m_local_snap_ids.begin();
- if (m_prev_snap_id != CEPH_NOSNAP) {
- snap_id_it = m_local_snap_ids.upper_bound(m_prev_snap_id);
- }
-
- for (; snap_id_it != m_local_snap_ids.end(); ++snap_id_it) {
- librados::snap_t local_snap_id = *snap_id_it;
-
- m_local_image_ctx->snap_lock.get_read();
-
- bool local_unprotected;
- int r = m_local_image_ctx->is_snap_unprotected(local_snap_id,
- &local_unprotected);
- if (r < 0) {
- derr << ": failed to retrieve local snap unprotect status: "
- << cpp_strerror(r) << dendl;
- m_local_image_ctx->snap_lock.put_read();
- finish(r);
- return;
- }
- m_local_image_ctx->snap_lock.put_read();
-
- if (local_unprotected) {
- // snap is already unprotected -- check next snap
- continue;
- }
-
- // if local snapshot is protected and (1) it isn't in our mapping
- // table, or (2) the remote snapshot isn't protected, unprotect it
- auto snap_seq_it = std::find_if(
- m_snap_seqs.begin(), m_snap_seqs.end(),
- [local_snap_id](const SnapSeqs::value_type& pair) {
- return pair.second == local_snap_id;
- });
-
- if (snap_seq_it != m_snap_seqs.end()) {
- m_remote_image_ctx->snap_lock.get_read();
- bool remote_unprotected;
- r = m_remote_image_ctx->is_snap_unprotected(snap_seq_it->first,
- &remote_unprotected);
- if (r < 0) {
- derr << ": failed to retrieve remote snap unprotect status: "
- << cpp_strerror(r) << dendl;
- m_remote_image_ctx->snap_lock.put_read();
- finish(r);
- return;
- }
- m_remote_image_ctx->snap_lock.put_read();
-
- if (remote_unprotected) {
- // remote is unprotected -- unprotect local snap
- break;
- }
- } else {
- // remote snapshot doesn't exist -- unprotect local snap
- break;
- }
- }
-
- if (snap_id_it == m_local_snap_ids.end()) {
- // no local snapshots to unprotect
- m_prev_snap_id = CEPH_NOSNAP;
- send_snap_remove();
- return;
- }
-
- m_prev_snap_id = *snap_id_it;
- m_snap_name = get_snapshot_name(m_local_image_ctx, m_prev_snap_id);
-
- dout(20) << ": "
- << "snap_name=" << m_snap_name << ", "
- << "snap_id=" << m_prev_snap_id << dendl;
-
- auto finish_op_ctx = start_local_op();
- if (finish_op_ctx == nullptr) {
- derr << ": lost exclusive lock" << dendl;
- finish(-EROFS);
- return;
- }
-
- auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
- handle_snap_unprotect(r);
- finish_op_ctx->complete(0);
- });
- RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock);
- m_local_image_ctx->operations->execute_snap_unprotect(
- cls::rbd::UserSnapshotNamespace(), m_snap_name.c_str(), ctx);
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::handle_snap_unprotect(int r) {
- dout(20) << ": r=" << r << dendl;
-
- if (r < 0) {
- derr << ": failed to unprotect snapshot '" << m_snap_name << "': "
- << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
- if (handle_cancellation())
- {
- return;
- }
-
- send_snap_unprotect();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send_snap_remove() {
- SnapIdSet::iterator snap_id_it = m_local_snap_ids.begin();
- if (m_prev_snap_id != CEPH_NOSNAP) {
- snap_id_it = m_local_snap_ids.upper_bound(m_prev_snap_id);
- }
-
- for (; snap_id_it != m_local_snap_ids.end(); ++snap_id_it) {
- librados::snap_t local_snap_id = *snap_id_it;
-
- cls::rbd::SnapshotNamespace snap_namespace;
- m_local_image_ctx->snap_lock.get_read();
- int r = m_local_image_ctx->get_snap_namespace(local_snap_id,
- &snap_namespace);
- m_local_image_ctx->snap_lock.put_read();
- if (r < 0) {
- derr << ": failed to retrieve local snap namespace: " << m_snap_name
- << dendl;
- finish(r);
- return;
- }
-
- if (boost::get<cls::rbd::UserSnapshotNamespace>(&snap_namespace) ==
- nullptr) {
- continue;
- }
-
- // if the local snapshot isn't in our mapping table, remove it
- auto snap_seq_it = std::find_if(
- m_snap_seqs.begin(), m_snap_seqs.end(),
- [local_snap_id](const SnapSeqs::value_type& pair) {
- return pair.second == local_snap_id;
- });
-
- if (snap_seq_it == m_snap_seqs.end()) {
- break;
- }
- }
-
- if (snap_id_it == m_local_snap_ids.end()) {
- // no local snapshots to delete
- m_prev_snap_id = CEPH_NOSNAP;
- send_snap_create();
- return;
- }
-
- m_prev_snap_id = *snap_id_it;
- m_snap_name = get_snapshot_name(m_local_image_ctx, m_prev_snap_id);
-
- dout(20) << ": "
- << "snap_name=" << m_snap_name << ", "
- << "snap_id=" << m_prev_snap_id << dendl;
-
- auto finish_op_ctx = start_local_op();
- if (finish_op_ctx == nullptr) {
- derr << ": lost exclusive lock" << dendl;
- finish(-EROFS);
- return;
- }
-
- auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
- handle_snap_remove(r);
- finish_op_ctx->complete(0);
- });
- RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock);
- m_local_image_ctx->operations->execute_snap_remove(
- cls::rbd::UserSnapshotNamespace(), m_snap_name.c_str(), ctx);
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::handle_snap_remove(int r) {
- dout(20) << ": r=" << r << dendl;
-
- if (r < 0) {
- derr << ": failed to remove snapshot '" << m_snap_name << "': "
- << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
- if (handle_cancellation())
- {
- return;
- }
-
- send_snap_remove();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send_snap_create() {
- SnapIdSet::iterator snap_id_it = m_remote_snap_ids.begin();
- if (m_prev_snap_id != CEPH_NOSNAP) {
- snap_id_it = m_remote_snap_ids.upper_bound(m_prev_snap_id);
- }
-
- for (; snap_id_it != m_remote_snap_ids.end(); ++snap_id_it) {
- librados::snap_t remote_snap_id = *snap_id_it;
-
- cls::rbd::SnapshotNamespace snap_namespace;
- m_remote_image_ctx->snap_lock.get_read();
- int r = m_remote_image_ctx->get_snap_namespace(remote_snap_id, &snap_namespace);
- m_remote_image_ctx->snap_lock.put_read();
- if (r < 0) {
- derr << ": failed to retrieve remote snap namespace: " << m_snap_name
- << dendl;
- finish(r);
- return;
- }
-
- // if the remote snapshot isn't in our mapping table, create it
- if (m_snap_seqs.find(remote_snap_id) == m_snap_seqs.end() &&
- boost::get<cls::rbd::UserSnapshotNamespace>(&snap_namespace) != nullptr) {
- break;
- }
- }
-
- if (snap_id_it == m_remote_snap_ids.end()) {
- // no remote snapshots to create
- m_prev_snap_id = CEPH_NOSNAP;
- send_snap_protect();
- return;
- }
-
- m_prev_snap_id = *snap_id_it;
- m_snap_name = get_snapshot_name(m_remote_image_ctx, m_prev_snap_id);
-
- m_remote_image_ctx->snap_lock.get_read();
- auto snap_info_it = m_remote_image_ctx->snap_info.find(m_prev_snap_id);
- if (snap_info_it == m_remote_image_ctx->snap_info.end()) {
- m_remote_image_ctx->snap_lock.put_read();
- derr << ": failed to retrieve remote snap info: " << m_snap_name
- << dendl;
- finish(-ENOENT);
- return;
- }
-
- uint64_t size = snap_info_it->second.size;
- m_snap_namespace = snap_info_it->second.snap_namespace;
- librbd::ParentSpec parent_spec;
- uint64_t parent_overlap = 0;
- if (snap_info_it->second.parent.spec.pool_id != -1) {
- parent_spec = m_local_parent_spec;
- parent_overlap = snap_info_it->second.parent.overlap;
- }
- m_remote_image_ctx->snap_lock.put_read();
-
-
- dout(20) << ": "
- << "snap_name=" << m_snap_name << ", "
- << "snap_id=" << m_prev_snap_id << ", "
- << "size=" << size << ", "
- << "parent_info=["
- << "pool_id=" << parent_spec.pool_id << ", "
- << "image_id=" << parent_spec.image_id << ", "
- << "snap_id=" << parent_spec.snap_id << ", "
- << "overlap=" << parent_overlap << "]" << dendl;
-
- Context *finish_op_ctx = start_local_op();
- if (finish_op_ctx == nullptr) {
- derr << ": lost exclusive lock" << dendl;
- finish(-EROFS);
- return;
- }
-
- auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
- handle_snap_create(r);
- finish_op_ctx->complete(0);
- });
- SnapshotCreateRequest<I> *req = SnapshotCreateRequest<I>::create(
- m_local_image_ctx, m_snap_name, m_snap_namespace, size, parent_spec,
- parent_overlap, ctx);
- req->send();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::handle_snap_create(int r) {
- dout(20) << ": r=" << r << dendl;
-
- if (r < 0) {
- derr << ": failed to create snapshot '" << m_snap_name << "': "
- << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
- if (handle_cancellation())
- {
- return;
- }
-
- assert(m_prev_snap_id != CEPH_NOSNAP);
-
- auto snap_it = m_local_image_ctx->snap_ids.find({cls::rbd::UserSnapshotNamespace(),
- m_snap_name});
- assert(snap_it != m_local_image_ctx->snap_ids.end());
- librados::snap_t local_snap_id = snap_it->second;
-
- dout(20) << ": mapping remote snap id " << m_prev_snap_id << " to "
- << local_snap_id << dendl;
- m_snap_seqs[m_prev_snap_id] = local_snap_id;
-
- send_snap_create();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send_snap_protect() {
- SnapIdSet::iterator snap_id_it = m_remote_snap_ids.begin();
- if (m_prev_snap_id != CEPH_NOSNAP) {
- snap_id_it = m_remote_snap_ids.upper_bound(m_prev_snap_id);
- }
-
- for (; snap_id_it != m_remote_snap_ids.end(); ++snap_id_it) {
- librados::snap_t remote_snap_id = *snap_id_it;
-
- m_remote_image_ctx->snap_lock.get_read();
-
- bool remote_protected;
- int r = m_remote_image_ctx->is_snap_protected(remote_snap_id,
- &remote_protected);
- if (r < 0) {
- derr << ": failed to retrieve remote snap protect status: "
- << cpp_strerror(r) << dendl;
- m_remote_image_ctx->snap_lock.put_read();
- finish(r);
- return;
- }
- m_remote_image_ctx->snap_lock.put_read();
-
- if (!remote_protected) {
- // snap is not protected -- check next snap
- continue;
- }
-
- // if local snapshot is not protected, protect it
- auto snap_seq_it = m_snap_seqs.find(remote_snap_id);
- assert(snap_seq_it != m_snap_seqs.end());
-
- m_local_image_ctx->snap_lock.get_read();
- bool local_protected;
- r = m_local_image_ctx->is_snap_protected(snap_seq_it->second,
- &local_protected);
- if (r < 0) {
- derr << ": failed to retrieve local snap protect status: "
- << cpp_strerror(r) << dendl;
- m_local_image_ctx->snap_lock.put_read();
- finish(r);
- return;
- }
- m_local_image_ctx->snap_lock.put_read();
-
- if (!local_protected) {
- break;
- }
- }
-
- if (snap_id_it == m_remote_snap_ids.end()) {
- // no local snapshots to protect
- m_prev_snap_id = CEPH_NOSNAP;
- send_update_client();
- return;
- }
-
- m_prev_snap_id = *snap_id_it;
- m_snap_name = get_snapshot_name(m_remote_image_ctx, m_prev_snap_id);
-
- dout(20) << ": "
- << "snap_name=" << m_snap_name << ", "
- << "snap_id=" << m_prev_snap_id << dendl;
-
- auto finish_op_ctx = start_local_op();
- if (finish_op_ctx == nullptr) {
- derr << ": lost exclusive lock" << dendl;
- finish(-EROFS);
- return;
- }
-
- auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
- handle_snap_protect(r);
- finish_op_ctx->complete(0);
- });
- RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock);
- m_local_image_ctx->operations->execute_snap_protect(
- cls::rbd::UserSnapshotNamespace(), m_snap_name.c_str(), ctx);
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::handle_snap_protect(int r) {
- dout(20) << ": r=" << r << dendl;
-
- if (r < 0) {
- derr << ": failed to protect snapshot '" << m_snap_name << "': "
- << cpp_strerror(r) << dendl;
- finish(r);
- return;
- }
- if (handle_cancellation())
- {
- return;
- }
-
- send_snap_protect();
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::send_update_client() {
- dout(20) << dendl;
-
- compute_snap_map();
-
- librbd::journal::MirrorPeerClientMeta client_meta(*m_client_meta);
- client_meta.snap_seqs = m_snap_seqs;
-
- librbd::journal::ClientData client_data(client_meta);
- bufferlist data_bl;
- ::encode(client_data, data_bl);
-
- Context *ctx = create_context_callback<
- SnapshotCopyRequest<I>, &SnapshotCopyRequest<I>::handle_update_client>(
- this);
- m_journaler->update_client(data_bl, ctx);
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::handle_update_client(int r) {
- dout(20) << ": r=" << r << dendl;
-
- if (r < 0) {
- derr << ": failed to update client data: " << cpp_strerror(r)
- << dendl;
- finish(r);
- return;
- }
- if (handle_cancellation())
- {
- return;
- }
-
- m_client_meta->snap_seqs = m_snap_seqs;
-
- finish(0);
-}
-
-template <typename I>
-bool SnapshotCopyRequest<I>::handle_cancellation() {
- {
- Mutex::Locker locker(m_lock);
- if (!m_canceled) {
- return false;
- }
- }
- dout(10) << ": snapshot copy canceled" << dendl;
- finish(-ECANCELED);
- return true;
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::error(int r) {
- dout(20) << ": r=" << r << dendl;
-
- m_work_queue->queue(new FunctionContext([this, r](int r1) { finish(r); }));
-}
-
-template <typename I>
-void SnapshotCopyRequest<I>::compute_snap_map() {
- SnapIds local_snap_ids;
- for (auto &pair : m_snap_seqs) {
- local_snap_ids.reserve(1 + local_snap_ids.size());
- local_snap_ids.insert(local_snap_ids.begin(), pair.second);
- m_snap_map->insert(std::make_pair(pair.first, local_snap_ids));
- }
-}
-
-template <typename I>
-int SnapshotCopyRequest<I>::validate_parent(I *image_ctx,
- librbd::ParentSpec *spec) {
- RWLock::RLocker owner_locker(image_ctx->owner_lock);
- RWLock::RLocker snap_locker(image_ctx->snap_lock);
-
- // ensure remote image's parent specs are still consistent
- *spec = image_ctx->parent_md.spec;
- for (auto &snap_info_pair : image_ctx->snap_info) {
- auto &parent_spec = snap_info_pair.second.parent.spec;
- if (parent_spec.pool_id == -1) {
- continue;
- } else if (spec->pool_id == -1) {
- *spec = parent_spec;
- continue;
- }
-
- if (*spec != parent_spec) {
- return -EINVAL;
- }
- }
- return 0;
-}
-
-template <typename I>
-Context *SnapshotCopyRequest<I>::start_local_op() {
- RWLock::RLocker owner_locker(m_local_image_ctx->owner_lock);
- if (m_local_image_ctx->exclusive_lock == nullptr) {
- return nullptr;
- }
- return m_local_image_ctx->exclusive_lock->start_op();
-}
-
-} // namespace image_sync
-} // namespace mirror
-} // namespace rbd
-
-template class rbd::mirror::image_sync::SnapshotCopyRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff