/
ImageDeleter.cc
625 lines (527 loc) · 17.9 KB
/
ImageDeleter.cc
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// -*- 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_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;
};
class StatusCommand : public ImageDeleterAdminSocketCommand {
public:
explicit StatusCommand(ImageDeleter *image_del) : image_del(image_del) {}
bool call(Formatter *f, stringstream *ss) {
image_del->print_status(f, ss);
return true;
}
private:
ImageDeleter *image_del;
};
struct DeleteJournalPolicy : public librbd::journal::Policy {
virtual void allocate_tag_on_lock(Context *on_finish) {
on_finish->complete(0);
}
virtual void cancel_external_replay(Context *on_finish) {
on_finish->complete(0);
}
};
} // anonymous namespace
class ImageDeleterAdminSocketHook : public AdminSocketHook {
public:
ImageDeleterAdminSocketHook(CephContext *cct, ImageDeleter *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(image_del);
}
}
~ImageDeleterAdminSocketHook() {
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) {
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;
};
ImageDeleter::ImageDeleter(ContextWQ *work_queue, SafeTimer *timer,
Mutex *timer_lock)
: m_running(1),
m_work_queue(work_queue),
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(g_ceph_context, this))
{
m_image_deleter_thread.create("image_deleter");
}
ImageDeleter::~ImageDeleter() {
dout(20) << "enter" << dendl;
m_running.set(0);
{
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;
}
void ImageDeleter::run() {
dout(20) << "enter" << dendl;
while(m_running.read()) {
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.read()) {
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.read()) {
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);
}
}
}
}
void ImageDeleter::schedule_image_delete(RadosRef local_rados,
int64_t local_pool_id,
const std::string& local_image_id,
const std::string& local_image_name,
const std::string& global_image_id) {
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 " << local_image_name << " (" << global_image_id << ") "
<< "was already scheduled for deletion" << dendl;
return;
}
m_delete_queue.push_front(unique_ptr<DeleteInfo>(
new DeleteInfo(local_rados, local_pool_id, local_image_id,
local_image_name, global_image_id)));
m_delete_queue_cond.Signal();
}
void ImageDeleter::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;
}
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;
}
void ImageDeleter::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;
}
}
bool ImageDeleter::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: " << cpp_strerror(r) << dendl;
enqueue_failed_delete(r);
return true;
}
dout(20) << "connected to local pool: " << ioctx.get_pool_name() << dendl;
bool is_primary = false;
r = Journal<>::is_tag_owner(ioctx, m_active_delete->local_image_id,
&is_primary);
if (r < 0 && r != -ENOENT) {
derr << "error retrieving image primary info: " << cpp_strerror(r)
<< dendl;
enqueue_failed_delete(r);
return true;
}
if (is_primary) {
dout(10) << "local image is the primary image, aborting deletion..."
<< 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, m_active_delete->local_image_id,
&has_snapshots);
if (r < 0) {
enqueue_failed_delete(r);
return true;
}
mirror_image.global_image_id = m_active_delete->global_image_id;
mirror_image.state = cls::rbd::MIRROR_IMAGE_STATE_DISABLING;
r = cls_client::mirror_image_set(&ioctx, m_active_delete->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 id "
<< m_active_delete->local_image_id
<< ": global_image_id has changed/reused, aborting deletion: "
<< cpp_strerror(r) << dendl;
complete_active_delete(r);
return true;
} else if (r < 0) {
derr << "cannot disable mirroring for image id "
<< m_active_delete->local_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("", m_active_delete->local_image_id,
nullptr, ioctx, false);
r = imgctx->state->open();
if (r < 0) {
derr << "error opening image id " << m_active_delete->local_image_id
<< ": " << cpp_strerror(r) << dendl;
enqueue_failed_delete(r);
delete imgctx;
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(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 " << m_active_delete->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(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, m_active_delete->local_image_name.c_str(), ctx,
true);
if (r < 0 && r != -ENOENT) {
derr << "error removing image " << m_active_delete->local_image_name
<< " 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, m_active_delete->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: "
<< m_active_delete->local_image_name << dendl;
complete_active_delete(0);
return true;
}
int ImageDeleter::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;
}
void ImageDeleter::complete_active_delete(int r) {
dout(20) << dendl;
m_delete_lock.Lock();
DeleteInfo *del_info = m_active_delete.release();
assert(del_info != nullptr);
m_delete_lock.Unlock();
del_info->notify(r);
}
void ImageDeleter::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::retry_failed_deletions, this));
Mutex::Locker l(*m_failed_timer_lock);
m_failed_timer->add_event_after(m_failed_interval, ctx);
}
}
void ImageDeleter::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();
}
}
unique_ptr<ImageDeleter::DeleteInfo> const* ImageDeleter::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;
}
void ImageDeleter::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);
}
}
void ImageDeleter::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);
}
}
void ImageDeleter::DeleteInfo::to_string(stringstream& ss) {
ss << "[" << "local_pool_id=" << local_pool_id << ", ";
ss << "local_image_id=" << local_image_id << ", ";
ss << "global_image_id=" << global_image_id << "]";
}
void ImageDeleter::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("local_image_id", local_image_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);
}
}
vector<string> ImageDeleter::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->local_image_name);
}
return items;
}
vector<pair<string, int> > ImageDeleter::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->local_image_name,
del_info->error_code));
}
return items;
}
void ImageDeleter::set_failed_timer_interval(double interval) {
this->m_failed_interval = interval;
}
} // namespace mirror
} // namespace rbd