--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 SUSE LINUX GmbH
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include <boost/bind.hpp>
+#include <map>
+#include <set>
+#include <sstream>
+
+#include "include/rados/librados.hpp"
+#include "common/Formatter.h"
+#include "common/admin_socket.h"
+#include "common/debug.h"
+#include "common/errno.h"
+#include "common/WorkQueue.h"
+#include "global/global_context.h"
+#include "librbd/internal.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/Journal.h"
+#include "librbd/Operations.h"
+#include "librbd/journal/Policy.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "cls/rbd/cls_rbd_types.h"
+#include "librbd/Utils.h"
+#include "ImageDeleter.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd_mirror
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd::mirror::ImageDeleter: " << this << " " \
+ << __func__ << ": "
+
+using std::string;
+using std::map;
+using std::stringstream;
+using std::vector;
+using std::pair;
+using std::make_pair;
+
+using librados::IoCtx;
+using namespace librbd;
+
+namespace rbd {
+namespace mirror {
+
+namespace {
+
+class ImageDeleterAdminSocketCommand {
+public:
+ virtual ~ImageDeleterAdminSocketCommand() {}
+ virtual bool call(Formatter *f, stringstream *ss) = 0;
+};
+
+template <typename I>
+class StatusCommand : public ImageDeleterAdminSocketCommand {
+public:
+ explicit StatusCommand(ImageDeleter<I> *image_del) : image_del(image_del) {}
+
+ bool call(Formatter *f, stringstream *ss) override {
+ image_del->print_status(f, ss);
+ return true;
+ }
+
+private:
+ ImageDeleter<I> *image_del;
+};
+
+struct DeleteJournalPolicy : public librbd::journal::Policy {
+ bool append_disabled() const override {
+ return true;
+ }
+ bool journal_disabled() const override {
+ return false;
+ }
+
+ void allocate_tag_on_lock(Context *on_finish) override {
+ on_finish->complete(0);
+ }
+};
+
+} // anonymous namespace
+
+template <typename I>
+class ImageDeleterAdminSocketHook : public AdminSocketHook {
+public:
+ ImageDeleterAdminSocketHook(CephContext *cct, ImageDeleter<I> *image_del) :
+ admin_socket(cct->get_admin_socket()) {
+
+ std::string command;
+ int r;
+
+ command = "rbd mirror deletion status";
+ r = admin_socket->register_command(command, command, this,
+ "get status for image deleter");
+ if (r == 0) {
+ commands[command] = new StatusCommand<I>(image_del);
+ }
+
+ }
+
+ ~ImageDeleterAdminSocketHook() override {
+ for (Commands::const_iterator i = commands.begin(); i != commands.end();
+ ++i) {
+ (void)admin_socket->unregister_command(i->first);
+ delete i->second;
+ }
+ }
+
+ bool call(std::string command, cmdmap_t& cmdmap, std::string format,
+ bufferlist& out) override {
+ Commands::const_iterator i = commands.find(command);
+ assert(i != commands.end());
+ Formatter *f = Formatter::create(format);
+ stringstream ss;
+ bool r = i->second->call(f, &ss);
+ delete f;
+ out.append(ss);
+ return r;
+ }
+
+private:
+ typedef std::map<std::string, ImageDeleterAdminSocketCommand*> Commands;
+ AdminSocket *admin_socket;
+ Commands commands;
+};
+
+template <typename I>
+ImageDeleter<I>::ImageDeleter(ContextWQ *work_queue, SafeTimer *timer,
+ Mutex *timer_lock,
+ ServiceDaemon<librbd::ImageCtx>* service_daemon)
+ : m_work_queue(work_queue),
+ m_service_daemon(service_daemon),
+ m_delete_lock("rbd::mirror::ImageDeleter::Delete"),
+ m_image_deleter_thread(this),
+ m_failed_timer(timer),
+ m_failed_timer_lock(timer_lock),
+ m_asok_hook(new ImageDeleterAdminSocketHook<I>(g_ceph_context, this))
+{
+ set_failed_timer_interval(g_ceph_context->_conf->get_val<double>(
+ "rbd_mirror_delete_retry_interval"));
+ m_image_deleter_thread.create("image_deleter");
+}
+
+template <typename I>
+ImageDeleter<I>::~ImageDeleter() {
+ dout(20) << "enter" << dendl;
+
+ m_running = false;
+ {
+ Mutex::Locker l (m_delete_lock);
+ m_delete_queue_cond.Signal();
+ }
+ if (m_image_deleter_thread.is_started()) {
+ m_image_deleter_thread.join();
+ }
+
+ delete m_asok_hook;
+ dout(20) << "return" << dendl;
+}
+
+template <typename I>
+void ImageDeleter<I>::run() {
+ dout(20) << "enter" << dendl;
+ while(m_running) {
+ m_delete_lock.Lock();
+ while (m_delete_queue.empty()) {
+ dout(20) << "waiting for delete requests" << dendl;
+ m_delete_queue_cond.Wait(m_delete_lock);
+
+ if (!m_running) {
+ m_delete_lock.Unlock();
+ dout(20) << "return" << dendl;
+ return;
+ }
+ }
+
+ m_active_delete = std::move(m_delete_queue.back());
+ m_delete_queue.pop_back();
+ m_delete_lock.Unlock();
+
+ bool move_to_next = process_image_delete();
+ if (!move_to_next) {
+ if (!m_running) {
+ dout(20) << "return" << dendl;
+ return;
+ }
+
+ Mutex::Locker l(m_delete_lock);
+ if (m_delete_queue.size() == 1) {
+ m_delete_queue_cond.Wait(m_delete_lock);
+ }
+ }
+ }
+}
+
+template <typename I>
+void ImageDeleter<I>::schedule_image_delete(RadosRef local_rados,
+ int64_t local_pool_id,
+ const std::string& global_image_id,
+ bool ignore_orphaned) {
+ dout(20) << "enter" << dendl;
+
+ Mutex::Locker locker(m_delete_lock);
+
+ auto del_info = find_delete_info(local_pool_id, global_image_id);
+ if (del_info != nullptr) {
+ dout(20) << "image " << global_image_id << " "
+ << "was already scheduled for deletion" << dendl;
+ if (ignore_orphaned) {
+ (*del_info)->ignore_orphaned = true;
+ }
+ return;
+ }
+
+ m_delete_queue.push_front(
+ unique_ptr<DeleteInfo>(new DeleteInfo(local_rados, local_pool_id,
+ global_image_id, ignore_orphaned)));
+ m_delete_queue_cond.Signal();
+}
+
+template <typename I>
+void ImageDeleter<I>::wait_for_scheduled_deletion(int64_t local_pool_id,
+ const std::string &global_image_id,
+ Context *ctx,
+ bool notify_on_failed_retry) {
+
+ ctx = new FunctionContext([this, ctx](int r) {
+ m_work_queue->queue(ctx, r);
+ });
+
+ Mutex::Locker locker(m_delete_lock);
+ auto del_info = find_delete_info(local_pool_id, global_image_id);
+ if (!del_info) {
+ // image not scheduled for deletion
+ ctx->complete(0);
+ return;
+ }
+
+ dout(20) << "local_pool_id=" << local_pool_id << ", "
+ << "global_image_id=" << global_image_id << dendl;
+
+ if ((*del_info)->on_delete != nullptr) {
+ (*del_info)->on_delete->complete(-ESTALE);
+ }
+ (*del_info)->on_delete = ctx;
+ (*del_info)->notify_on_failed_retry = notify_on_failed_retry;
+}
+
+template <typename I>
+void ImageDeleter<I>::cancel_waiter(int64_t local_pool_id,
+ const std::string &global_image_id) {
+ Mutex::Locker locker(m_delete_lock);
+ auto del_info = find_delete_info(local_pool_id, global_image_id);
+ if (!del_info) {
+ return;
+ }
+
+ if ((*del_info)->on_delete != nullptr) {
+ (*del_info)->on_delete->complete(-ECANCELED);
+ (*del_info)->on_delete = nullptr;
+ }
+}
+
+template <typename I>
+bool ImageDeleter<I>::process_image_delete() {
+ stringstream ss;
+ m_active_delete->to_string(ss);
+ std::string del_info_str = ss.str();
+ dout(10) << "start processing delete request: " << del_info_str << dendl;
+ int r;
+ cls::rbd::MirrorImage mirror_image;
+
+ // remote image was disabled, now we need to delete local image
+ IoCtx ioctx;
+ r = m_active_delete->local_rados->ioctx_create2(
+ m_active_delete->local_pool_id, ioctx);
+ if (r < 0) {
+ derr << "error accessing local pool " << m_active_delete->local_pool_id
+ << ": " << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ dout(20) << "connected to local pool: " << ioctx.get_pool_name() << dendl;
+
+ auto &global_image_id = m_active_delete->global_image_id;
+ std::string local_image_id;
+ r = librbd::cls_client::mirror_image_get_image_id(
+ &ioctx, global_image_id, &local_image_id);
+ if (r == -ENOENT) {
+ dout(10) << "image " << global_image_id << " is not mirrored" << dendl;
+ complete_active_delete(r);
+ return true;
+ } else if (r < 0) {
+ derr << "error retrieving local id for image " << global_image_id
+ << ": " << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ std::string mirror_uuid;
+ C_SaferCond tag_owner_ctx;
+ Journal<>::get_tag_owner(ioctx, local_image_id, &mirror_uuid, m_work_queue,
+ &tag_owner_ctx);
+ r = tag_owner_ctx.wait();
+ if (r < 0 && r != -ENOENT) {
+ derr << "error retrieving image primary info for image " << global_image_id
+ << ": " << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ } else if (r != -ENOENT) {
+ if (mirror_uuid == Journal<>::LOCAL_MIRROR_UUID) {
+ dout(10) << "image " << global_image_id << " is local primary" << dendl;
+ complete_active_delete(-EISPRM);
+ return true;
+ } else if (mirror_uuid == Journal<>::ORPHAN_MIRROR_UUID &&
+ !m_active_delete->ignore_orphaned) {
+ dout(10) << "image " << global_image_id << " is orphaned" << dendl;
+ complete_active_delete(-EISPRM);
+ return true;
+ }
+ }
+
+ dout(20) << "local image is not the primary" << dendl;
+ bool has_snapshots;
+ r = image_has_snapshots_and_children(&ioctx, local_image_id, &has_snapshots);
+ if (r < 0) {
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ mirror_image.global_image_id = global_image_id;
+ mirror_image.state = cls::rbd::MIRROR_IMAGE_STATE_DISABLING;
+ r = cls_client::mirror_image_set(&ioctx, local_image_id, mirror_image);
+ if (r == -ENOENT) {
+ dout(10) << "local image is not mirrored, aborting deletion..." << dendl;
+ complete_active_delete(r);
+ return true;
+ } else if (r == -EEXIST || r == -EINVAL) {
+ derr << "cannot disable mirroring for image " << global_image_id
+ << ": global_image_id has changed/reused: "
+ << cpp_strerror(r) << dendl;
+ complete_active_delete(r);
+ return true;
+ } else if (r < 0) {
+ derr << "cannot disable mirroring for image " << global_image_id
+ << ": " << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ dout(20) << "set local image mirroring to disable" << dendl;
+
+ if (has_snapshots) {
+ dout(20) << "local image has snapshots" << dendl;
+
+ ImageCtx *imgctx = new ImageCtx("", local_image_id, nullptr, ioctx, false);
+ r = imgctx->state->open(false);
+ if (r < 0) {
+ derr << "error opening image " << global_image_id << " ("
+ << local_image_id << "): " << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ {
+ RWLock::WLocker snap_locker(imgctx->snap_lock);
+ imgctx->set_journal_policy(new DeleteJournalPolicy());
+ }
+
+ std::vector<librbd::snap_info_t> snaps;
+ r = librbd::snap_list(imgctx, snaps);
+ if (r < 0) {
+ derr << "error listing snapshot of image " << imgctx->name
+ << cpp_strerror(r) << dendl;
+ imgctx->state->close();
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ for (const auto& snap : snaps) {
+ dout(20) << "processing deletion of snapshot " << imgctx->name << "@"
+ << snap.name << dendl;
+
+ bool is_protected;
+ r = librbd::snap_is_protected(imgctx, snap.name.c_str(), &is_protected);
+ if (r < 0) {
+ derr << "error checking snapshot protection of snapshot "
+ << imgctx->name << "@" << snap.name << ": " << cpp_strerror(r)
+ << dendl;
+ imgctx->state->close();
+ enqueue_failed_delete(r);
+ return true;
+ }
+ if (is_protected) {
+ dout(20) << "snapshot " << imgctx->name << "@" << snap.name
+ << " is protected, issuing unprotect command" << dendl;
+
+ r = imgctx->operations->snap_unprotect(
+ cls::rbd::UserSnapshotNamespace(), snap.name.c_str());
+ if (r == -EBUSY) {
+ // there are still clones of snapshots of this image, therefore send
+ // the delete request to the end of the queue
+ dout(10) << "local image id " << local_image_id << " has "
+ << "snapshots with cloned children, postponing deletion..."
+ << dendl;
+ imgctx->state->close();
+ Mutex::Locker l(m_delete_lock);
+ m_active_delete->notify(r);
+ m_delete_queue.push_front(std::move(m_active_delete));
+ return false;
+ } else if (r < 0) {
+ derr << "error unprotecting snapshot " << imgctx->name << "@"
+ << snap.name << ": " << cpp_strerror(r) << dendl;
+ imgctx->state->close();
+ enqueue_failed_delete(r);
+ return true;
+ }
+ }
+
+ r = imgctx->operations->snap_remove(cls::rbd::UserSnapshotNamespace(),
+ snap.name.c_str());
+ if (r < 0) {
+ derr << "error removing snapshot " << imgctx->name << "@"
+ << snap.name << ": " << cpp_strerror(r) << dendl;
+ imgctx->state->close();
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ dout(10) << "snapshot " << imgctx->name << "@" << snap.name
+ << " was deleted" << dendl;
+ }
+
+ imgctx->state->close();
+ }
+
+ librbd::NoOpProgressContext ctx;
+ r = librbd::remove(ioctx, "", local_image_id, ctx, true);
+ if (r < 0 && r != -ENOENT) {
+ derr << "error removing image " << global_image_id << " "
+ << "(" << local_image_id << ") from local pool: "
+ << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ // image was already deleted from rbd_directory, now we will make sure
+ // that will be also removed from rbd_mirroring
+ if (r == -ENOENT) {
+ dout(20) << "local image does not exist, removing image from rbd_mirroring"
+ << dendl;
+ }
+
+ r = cls_client::mirror_image_remove(&ioctx, local_image_id);
+ if (r < 0 && r != -ENOENT) {
+ derr << "error removing image from mirroring directory: "
+ << cpp_strerror(r) << dendl;
+ enqueue_failed_delete(r);
+ return true;
+ }
+
+ dout(10) << "Successfully deleted image "
+ << global_image_id << " " << "(" << local_image_id << ")" << dendl;
+
+ complete_active_delete(0);
+ return true;
+}
+
+template <typename I>
+int ImageDeleter<I>::image_has_snapshots_and_children(IoCtx *ioctx,
+ string& image_id,
+ bool *has_snapshots) {
+ string header_oid = librbd::util::header_name(image_id);
+ ::SnapContext snapc;
+ int r = cls_client::get_snapcontext(ioctx, header_oid, &snapc);
+ if (r < 0 && r != -ENOENT) {
+ derr << "error retrieving snapshot context for image id " << image_id
+ << ": " << cpp_strerror(r) << dendl;
+ return r;
+ }
+
+ *has_snapshots = !snapc.snaps.empty();
+
+ return 0;
+}
+
+template <typename I>
+void ImageDeleter<I>::complete_active_delete(int r) {
+ dout(20) << dendl;
+
+ Mutex::Locker delete_locker(m_delete_lock);
+ m_active_delete->notify(r);
+ m_active_delete.reset();
+}
+
+template <typename I>
+void ImageDeleter<I>::enqueue_failed_delete(int error_code) {
+ dout(20) << "enter" << dendl;
+
+ if (error_code == -EBLACKLISTED) {
+ derr << "blacklisted while deleting local image" << dendl;
+ complete_active_delete(error_code);
+ return;
+ }
+
+ m_delete_lock.Lock();
+ if (m_active_delete->notify_on_failed_retry) {
+ m_active_delete->notify(error_code);
+ }
+ m_active_delete->error_code = error_code;
+ bool was_empty = m_failed_queue.empty();
+ m_failed_queue.push_front(std::move(m_active_delete));
+ m_delete_lock.Unlock();
+ if (was_empty) {
+ FunctionContext *ctx = new FunctionContext(
+ boost::bind(&ImageDeleter<I>::retry_failed_deletions, this));
+ Mutex::Locker l(*m_failed_timer_lock);
+ m_failed_timer->add_event_after(m_failed_interval, ctx);
+ }
+}
+
+template <typename I>
+void ImageDeleter<I>::retry_failed_deletions() {
+ dout(20) << "enter" << dendl;
+
+ Mutex::Locker l(m_delete_lock);
+
+ bool empty = m_failed_queue.empty();
+ while (!m_failed_queue.empty()) {
+ m_delete_queue.push_back(std::move(m_failed_queue.back()));
+ m_delete_queue.back()->retries++;
+ m_failed_queue.pop_back();
+ }
+ if (!empty) {
+ m_delete_queue_cond.Signal();
+ }
+}
+
+template <typename I>
+unique_ptr<typename ImageDeleter<I>::DeleteInfo> const*
+ImageDeleter<I>::find_delete_info(int64_t local_pool_id,
+ const std::string &global_image_id) {
+ assert(m_delete_lock.is_locked());
+
+ if (m_active_delete && m_active_delete->match(local_pool_id,
+ global_image_id)) {
+ return &m_active_delete;
+ }
+
+ for (const auto& del_info : m_delete_queue) {
+ if (del_info->match(local_pool_id, global_image_id)) {
+ return &del_info;
+ }
+ }
+
+ for (const auto& del_info : m_failed_queue) {
+ if (del_info->match(local_pool_id, global_image_id)) {
+ return &del_info;
+ }
+ }
+
+ return nullptr;
+}
+
+template <typename I>
+void ImageDeleter<I>::print_status(Formatter *f, stringstream *ss) {
+ dout(20) << "enter" << dendl;
+
+ if (f) {
+ f->open_object_section("image_deleter_status");
+ f->open_array_section("delete_images_queue");
+ }
+
+ Mutex::Locker l(m_delete_lock);
+ for (const auto& image : m_delete_queue) {
+ image->print_status(f, ss);
+ }
+
+ if (f) {
+ f->close_section();
+ f->open_array_section("failed_deletes_queue");
+ }
+
+ for (const auto& image : m_failed_queue) {
+ image->print_status(f, ss, true);
+ }
+
+ if (f) {
+ f->close_section();
+ f->close_section();
+ f->flush(*ss);
+ }
+}
+
+template <typename I>
+void ImageDeleter<I>::DeleteInfo::notify(int r) {
+ if (on_delete) {
+ dout(20) << "executing image deletion handler r=" << r << dendl;
+
+ Context *ctx = on_delete;
+ on_delete = nullptr;
+ ctx->complete(r);
+ }
+}
+
+template <typename I>
+void ImageDeleter<I>::DeleteInfo::to_string(stringstream& ss) {
+ ss << "[" << "local_pool_id=" << local_pool_id << ", ";
+ ss << "global_image_id=" << global_image_id << "]";
+}
+
+template <typename I>
+void ImageDeleter<I>::DeleteInfo::print_status(Formatter *f, stringstream *ss,
+ bool print_failure_info) {
+ if (f) {
+ f->open_object_section("delete_info");
+ f->dump_int("local_pool_id", local_pool_id);
+ f->dump_string("global_image_id", global_image_id);
+ if (print_failure_info) {
+ f->dump_string("error_code", cpp_strerror(error_code));
+ f->dump_int("retries", retries);
+ }
+ f->close_section();
+ f->flush(*ss);
+ } else {
+ this->to_string(*ss);
+ }
+}
+
+template <typename I>
+vector<string> ImageDeleter<I>::get_delete_queue_items() {
+ vector<string> items;
+
+ Mutex::Locker l(m_delete_lock);
+ for (const auto& del_info : m_delete_queue) {
+ items.push_back(del_info->global_image_id);
+ }
+
+ return items;
+}
+
+template <typename I>
+vector<pair<string, int> > ImageDeleter<I>::get_failed_queue_items() {
+ vector<pair<string, int> > items;
+
+ Mutex::Locker l(m_delete_lock);
+ for (const auto& del_info : m_failed_queue) {
+ items.push_back(make_pair(del_info->global_image_id,
+ del_info->error_code));
+ }
+
+ return items;
+}
+
+template <typename I>
+void ImageDeleter<I>::set_failed_timer_interval(double interval) {
+ this->m_failed_interval = interval;
+}
+
+} // namespace mirror
+} // namespace rbd
+
+template class rbd::mirror::ImageDeleter<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff