[ceph.git] / ceph / src / librbd / ObjectMap.cc

// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#include "librbd/ObjectMap.h"
#include "librbd/BlockGuard.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/object_map/RefreshRequest.h"
#include "librbd/object_map/ResizeRequest.h"
#include "librbd/object_map/SnapshotCreateRequest.h"
#include "librbd/object_map/SnapshotRemoveRequest.h"
#include "librbd/object_map/SnapshotRollbackRequest.h"
#include "librbd/object_map/UnlockRequest.h"
#include "librbd/object_map/UpdateRequest.h"
#include "librbd/Utils.h"
#include "common/dout.h"
#include "common/errno.h"
#include "common/WorkQueue.h"

#include "include/rados/librados.hpp"

#include "cls/lock/cls_lock_client.h"
#include "cls/rbd/cls_rbd_types.h"
#include "include/stringify.h"
#include "osdc/Striper.h"
#include <sstream>

#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::ObjectMap: " << this << " " << __func__ \
                           << ": "

namespace librbd {

template <typename I>
ObjectMap<I>::ObjectMap(I &image_ctx, uint64_t snap_id)
  : m_image_ctx(image_ctx), m_snap_id(snap_id),
    m_update_guard(new UpdateGuard(m_image_ctx.cct)) {
}

template <typename I>
ObjectMap<I>::~ObjectMap() {
  delete m_update_guard;
}

template <typename I>
int ObjectMap<I>::aio_remove(librados::IoCtx &io_ctx, const std::string &image_id,
			     librados::AioCompletion *c) {
  return io_ctx.aio_remove(object_map_name(image_id, CEPH_NOSNAP), c);
}

template <typename I>
std::string ObjectMap<I>::object_map_name(const std::string &image_id,
				          uint64_t snap_id) {
  std::string oid(RBD_OBJECT_MAP_PREFIX + image_id);
  if (snap_id != CEPH_NOSNAP) {
    std::stringstream snap_suffix;
    snap_suffix << "." << std::setfill('0') << std::setw(16) << std::hex
		<< snap_id;
    oid += snap_suffix.str();
  }
  return oid;
}

template <typename I>
bool ObjectMap<I>::is_compatible(const file_layout_t& layout, uint64_t size) {
  uint64_t object_count = Striper::get_num_objects(layout, size);
  return (object_count <= cls::rbd::MAX_OBJECT_MAP_OBJECT_COUNT);
}

template <typename I>
ceph::BitVector<2u>::Reference ObjectMap<I>::operator[](uint64_t object_no)
{
  assert(m_image_ctx.object_map_lock.is_wlocked());
  assert(object_no < m_object_map.size());
  return m_object_map[object_no];
}

template <typename I>
uint8_t ObjectMap<I>::operator[](uint64_t object_no) const
{
  assert(m_image_ctx.object_map_lock.is_locked());
  assert(object_no < m_object_map.size());
  return m_object_map[object_no];
}

template <typename I>
bool ObjectMap<I>::object_may_exist(uint64_t object_no) const
{
  assert(m_image_ctx.snap_lock.is_locked());

  // Fall back to default logic if object map is disabled or invalid
  if (!m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
                                 m_image_ctx.snap_lock)) {
    return true;
  }

  bool flags_set;
  int r = m_image_ctx.test_flags(RBD_FLAG_OBJECT_MAP_INVALID,
                                 m_image_ctx.snap_lock, &flags_set);
  if (r < 0 || flags_set) {
    return true;
  }

  RWLock::RLocker l(m_image_ctx.object_map_lock);
  uint8_t state = (*this)[object_no];
  bool exists = (state != OBJECT_NONEXISTENT);
  ldout(m_image_ctx.cct, 20) << "object_no=" << object_no << " r=" << exists
			     << dendl;
  return exists;
}

template <typename I>
bool ObjectMap<I>::update_required(uint64_t object_no, uint8_t new_state) {
  assert(m_image_ctx.object_map_lock.is_wlocked());
  uint8_t state = (*this)[object_no];

  if ((state == new_state) ||
      (new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) ||
      (new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) {
    return false;
  }
  return true;
}

template <typename I>
void ObjectMap<I>::open(Context *on_finish) {
  auto req = object_map::RefreshRequest<I>::create(
    m_image_ctx, &m_object_map, m_snap_id, on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::close(Context *on_finish) {
  if (m_snap_id != CEPH_NOSNAP) {
    m_image_ctx.op_work_queue->queue(on_finish, 0);
    return;
  }

  auto req = object_map::UnlockRequest<I>::create(m_image_ctx, on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::rollback(uint64_t snap_id, Context *on_finish) {
  assert(m_image_ctx.snap_lock.is_locked());
  assert(m_image_ctx.object_map_lock.is_wlocked());

  object_map::SnapshotRollbackRequest *req =
    new object_map::SnapshotRollbackRequest(m_image_ctx, snap_id, on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::snapshot_add(uint64_t snap_id, Context *on_finish) {
  assert(m_image_ctx.snap_lock.is_locked());
  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
  assert(snap_id != CEPH_NOSNAP);

  object_map::SnapshotCreateRequest *req =
    new object_map::SnapshotCreateRequest(m_image_ctx, &m_object_map, snap_id,
                                          on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::snapshot_remove(uint64_t snap_id, Context *on_finish) {
  assert(m_image_ctx.snap_lock.is_wlocked());
  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
  assert(snap_id != CEPH_NOSNAP);

  object_map::SnapshotRemoveRequest *req =
    new object_map::SnapshotRemoveRequest(m_image_ctx, &m_object_map, snap_id,
                                          on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::aio_save(Context *on_finish) {
  assert(m_image_ctx.owner_lock.is_locked());
  assert(m_image_ctx.snap_lock.is_locked());
  assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
                                   m_image_ctx.snap_lock));
  RWLock::RLocker object_map_locker(m_image_ctx.object_map_lock);

  librados::ObjectWriteOperation op;
  if (m_snap_id == CEPH_NOSNAP) {
    rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
  }
  cls_client::object_map_save(&op, m_object_map);

  std::string oid(object_map_name(m_image_ctx.id, m_snap_id));
  librados::AioCompletion *comp = util::create_rados_callback(on_finish);

  int r = m_image_ctx.md_ctx.aio_operate(oid, comp, &op);
  assert(r == 0);
  comp->release();
}

template <typename I>
void ObjectMap<I>::aio_resize(uint64_t new_size, uint8_t default_object_state,
			      Context *on_finish) {
  assert(m_image_ctx.owner_lock.is_locked());
  assert(m_image_ctx.snap_lock.is_locked());
  assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
                                   m_image_ctx.snap_lock));
  assert(m_image_ctx.image_watcher != NULL);
  assert(m_image_ctx.exclusive_lock == nullptr ||
         m_image_ctx.exclusive_lock->is_lock_owner());

  object_map::ResizeRequest *req = new object_map::ResizeRequest(
    m_image_ctx, &m_object_map, m_snap_id, new_size, default_object_state,
    on_finish);
  req->send();
}

template <typename I>
void ObjectMap<I>::detained_aio_update(UpdateOperation &&op) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << dendl;

  assert(m_image_ctx.snap_lock.is_locked());
  assert(m_image_ctx.object_map_lock.is_wlocked());

  BlockGuardCell *cell;
  int r = m_update_guard->detain({op.start_object_no, op.end_object_no},
                                &op, &cell);
  if (r < 0) {
    lderr(cct) << "failed to detain object map update: " << cpp_strerror(r)
               << dendl;
    m_image_ctx.op_work_queue->queue(op.on_finish, r);
    return;
  } else if (r > 0) {
    ldout(cct, 20) << "detaining object map update due to in-flight update: "
                   << "start=" << op.start_object_no << ", "
		   << "end=" << op.end_object_no << ", "
                   << (op.current_state ?
                         stringify(static_cast<uint32_t>(*op.current_state)) :
                         "")
		   << "->" << static_cast<uint32_t>(op.new_state) << dendl;
    return;
  }

  ldout(cct, 20) << "in-flight update cell: " << cell << dendl;
  Context *on_finish = op.on_finish;
  Context *ctx = new FunctionContext([this, cell, on_finish](int r) {
      handle_detained_aio_update(cell, r, on_finish);
    });
  aio_update(CEPH_NOSNAP, op.start_object_no, op.end_object_no, op.new_state,
             op.current_state, op.parent_trace, ctx);
}

template <typename I>
void ObjectMap<I>::handle_detained_aio_update(BlockGuardCell *cell, int r,
                                              Context *on_finish) {
  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "cell=" << cell << ", r=" << r << dendl;

  typename UpdateGuard::BlockOperations block_ops;
  m_update_guard->release(cell, &block_ops);

  {
    RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
    RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
    for (auto &op : block_ops) {
      detained_aio_update(std::move(op));
    }
  }

  on_finish->complete(r);
}

template <typename I>
void ObjectMap<I>::aio_update(uint64_t snap_id, uint64_t start_object_no,
                              uint64_t end_object_no, uint8_t new_state,
                              const boost::optional<uint8_t> &current_state,
                              const ZTracer::Trace &parent_trace,
                              Context *on_finish) {
  assert(m_image_ctx.snap_lock.is_locked());
  assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
  assert(m_image_ctx.image_watcher != nullptr);
  assert(m_image_ctx.exclusive_lock == nullptr ||
         m_image_ctx.exclusive_lock->is_lock_owner());
  assert(snap_id != CEPH_NOSNAP || m_image_ctx.object_map_lock.is_wlocked());
  assert(start_object_no < end_object_no);

  CephContext *cct = m_image_ctx.cct;
  ldout(cct, 20) << "start=" << start_object_no << ", "
		 << "end=" << end_object_no << ", "
                 << (current_state ?
                       stringify(static_cast<uint32_t>(*current_state)) : "")
		 << "->" << static_cast<uint32_t>(new_state) << dendl;
  if (snap_id == CEPH_NOSNAP) {
    if (end_object_no > m_object_map.size()) {
      ldout(cct, 20) << "skipping update of invalid object map" << dendl;
      m_image_ctx.op_work_queue->queue(on_finish, 0);
      return;
    }

    uint64_t object_no;
    for (object_no = start_object_no; object_no < end_object_no; ++object_no) {
      if (update_required(object_no, new_state)) {
        break;
      }
    }
    if (object_no == end_object_no) {
      ldout(cct, 20) << "object map update not required" << dendl;
      m_image_ctx.op_work_queue->queue(on_finish, 0);
      return;
    }
  }

  auto req = object_map::UpdateRequest<I>::create(
    m_image_ctx, &m_object_map, snap_id, start_object_no, end_object_no,
    new_state, current_state, parent_trace, on_finish);
  req->send();
}

} // namespace librbd

template class librbd::ObjectMap<librbd::ImageCtx>;
Commit	Line	Data
7c673cae FG	1	// -- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t --
	2	// vim: ts=8 sw=2 smarttab
	3
	4	#include "librbd/ObjectMap.h"
	5	#include "librbd/BlockGuard.h"
	6	#include "librbd/ExclusiveLock.h"
	7	#include "librbd/ImageCtx.h"
	8	#include "librbd/object_map/RefreshRequest.h"
	9	#include "librbd/object_map/ResizeRequest.h"
	10	#include "librbd/object_map/SnapshotCreateRequest.h"
	11	#include "librbd/object_map/SnapshotRemoveRequest.h"
	12	#include "librbd/object_map/SnapshotRollbackRequest.h"
	13	#include "librbd/object_map/UnlockRequest.h"
	14	#include "librbd/object_map/UpdateRequest.h"
	15	#include "librbd/Utils.h"
	16	#include "common/dout.h"
	17	#include "common/errno.h"
	18	#include "common/WorkQueue.h"
	19
	20	#include "include/rados/librados.hpp"
	21
	22	#include "cls/lock/cls_lock_client.h"
	23	#include "cls/rbd/cls_rbd_types.h"
	24	#include "include/stringify.h"
	25	#include "osdc/Striper.h"
	26	#include <sstream>
	27
	28	#define dout_subsys ceph_subsys_rbd
	29	#undef dout_prefix
	30	#define dout_prefix *_dout << "librbd::ObjectMap: " << this << " " << __func__ \
	31	<< ": "
	32
	33	namespace librbd {
	34
	35	template <typename I>
	36	ObjectMap<I>::ObjectMap(I &image_ctx, uint64_t snap_id)
	37	: m_image_ctx(image_ctx), m_snap_id(snap_id),
	38	m_update_guard(new UpdateGuard(m_image_ctx.cct)) {
	39	}
	40
	41	template <typename I>
	42	ObjectMap<I>::~ObjectMap() {
	43	delete m_update_guard;
	44	}
	45
	46	template <typename I>
	47	int ObjectMap<I>::aio_remove(librados::IoCtx &io_ctx, const std::string &image_id,
	48	librados::AioCompletion *c) {
	49	return io_ctx.aio_remove(object_map_name(image_id, CEPH_NOSNAP), c);
	50	}
	51
	52	template <typename I>
	53	std::string ObjectMap<I>::object_map_name(const std::string &image_id,
	54	uint64_t snap_id) {
	55	std::string oid(RBD_OBJECT_MAP_PREFIX + image_id);
	56	if (snap_id != CEPH_NOSNAP) {
	57	std::stringstream snap_suffix;
	58	snap_suffix << "." << std::setfill('0') << std::setw(16) << std::hex
	59	<< snap_id;
	60	oid += snap_suffix.str();
	61	}
	62	return oid;
	63	}
	64
65	template <typename I>
66	bool ObjectMap<I>::is_compatible(const file_layout_t& layout, uint64_t size) {
67	uint64_t object_count = Striper::get_num_objects(layout, size);
68	return (object_count <= cls::rbd::MAX_OBJECT_MAP_OBJECT_COUNT);
69	}
70
71	template <typename I>
72	ceph::BitVector<2u>::Reference ObjectMap<I>::operator[](uint64_t object_no)
73	{
74	assert(m_image_ctx.object_map_lock.is_wlocked());
75	assert(object_no < m_object_map.size());
76	return m_object_map[object_no];
77	}
78
79	template <typename I>
80	uint8_t ObjectMap<I>::operator[](uint64_t object_no) const
81	{
82	assert(m_image_ctx.object_map_lock.is_locked());
83	assert(object_no < m_object_map.size());
84	return m_object_map[object_no];
85	}
86
87	template <typename I>
88	bool ObjectMap<I>::object_may_exist(uint64_t object_no) const
89	{
90	assert(m_image_ctx.snap_lock.is_locked());
91
92	// Fall back to default logic if object map is disabled or invalid
93	if (!m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
31f18b77 FG	94	m_image_ctx.snap_lock)) {
	95	return true;
	96	}
	97
	98	bool flags_set;
	99	int r = m_image_ctx.test_flags(RBD_FLAG_OBJECT_MAP_INVALID,
	100	m_image_ctx.snap_lock, &flags_set);
	101	if (r < 0 \|\| flags_set) {
7c673cae FG	102	return true;
	103	}
	104
	105	RWLock::RLocker l(m_image_ctx.object_map_lock);
	106	uint8_t state = (*this)[object_no];
	107	bool exists = (state != OBJECT_NONEXISTENT);
	108	ldout(m_image_ctx.cct, 20) << "object_no=" << object_no << " r=" << exists
	109	<< dendl;
	110	return exists;
	111	}
	112
	113	template <typename I>
	114	bool ObjectMap<I>::update_required(uint64_t object_no, uint8_t new_state) {
	115	assert(m_image_ctx.object_map_lock.is_wlocked());
	116	uint8_t state = (*this)[object_no];
	117
	118	if ((state == new_state) \|\|
	119	(new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) \|\|
	120	(new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) {
	121	return false;
	122	}
	123	return true;
	124	}
	125
	126	template <typename I>
	127	void ObjectMap<I>::open(Context *on_finish) {
	128	auto req = object_map::RefreshRequest<I>::create(
	129	m_image_ctx, &m_object_map, m_snap_id, on_finish);
	130	req->send();
	131	}
	132
	133	template <typename I>
	134	void ObjectMap<I>::close(Context *on_finish) {
	135	if (m_snap_id != CEPH_NOSNAP) {
	136	m_image_ctx.op_work_queue->queue(on_finish, 0);
	137	return;
	138	}
	139
	140	auto req = object_map::UnlockRequest<I>::create(m_image_ctx, on_finish);
	141	req->send();
	142	}
	143
	144	template <typename I>
	145	void ObjectMap<I>::rollback(uint64_t snap_id, Context *on_finish) {
	146	assert(m_image_ctx.snap_lock.is_locked());
	147	assert(m_image_ctx.object_map_lock.is_wlocked());
	148
	149	object_map::SnapshotRollbackRequest *req =
	150	new object_map::SnapshotRollbackRequest(m_image_ctx, snap_id, on_finish);
	151	req->send();
	152	}
	153
	154	template <typename I>
	155	void ObjectMap<I>::snapshot_add(uint64_t snap_id, Context *on_finish) {
	156	assert(m_image_ctx.snap_lock.is_locked());
	157	assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
	158	assert(snap_id != CEPH_NOSNAP);
	159
	160	object_map::SnapshotCreateRequest *req =
	161	new object_map::SnapshotCreateRequest(m_image_ctx, &m_object_map, snap_id,
	162	on_finish);
	163	req->send();
	164	}
	165
166	template <typename I>
167	void ObjectMap<I>::snapshot_remove(uint64_t snap_id, Context *on_finish) {
168	assert(m_image_ctx.snap_lock.is_wlocked());
169	assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
170	assert(snap_id != CEPH_NOSNAP);
171
172	object_map::SnapshotRemoveRequest *req =
173	new object_map::SnapshotRemoveRequest(m_image_ctx, &m_object_map, snap_id,
174	on_finish);
175	req->send();
176	}
177
178	template <typename I>
179	void ObjectMap<I>::aio_save(Context *on_finish) {
180	assert(m_image_ctx.owner_lock.is_locked());
181	assert(m_image_ctx.snap_lock.is_locked());
182	assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
183	m_image_ctx.snap_lock));
184	RWLock::RLocker object_map_locker(m_image_ctx.object_map_lock);
185
186	librados::ObjectWriteOperation op;
187	if (m_snap_id == CEPH_NOSNAP) {
188	rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
189	}
190	cls_client::object_map_save(&op, m_object_map);
191
192	std::string oid(object_map_name(m_image_ctx.id, m_snap_id));
193	librados::AioCompletion *comp = util::create_rados_callback(on_finish);
194
195	int r = m_image_ctx.md_ctx.aio_operate(oid, comp, &op);
196	assert(r == 0);
197	comp->release();
198	}
199
200	template <typename I>
201	void ObjectMap<I>::aio_resize(uint64_t new_size, uint8_t default_object_state,
202	Context *on_finish) {
203	assert(m_image_ctx.owner_lock.is_locked());
204	assert(m_image_ctx.snap_lock.is_locked());
205	assert(m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP,
206	m_image_ctx.snap_lock));
207	assert(m_image_ctx.image_watcher != NULL);
208	assert(m_image_ctx.exclusive_lock == nullptr \|\|
209	m_image_ctx.exclusive_lock->is_lock_owner());
210
211	object_map::ResizeRequest *req = new object_map::ResizeRequest(
212	m_image_ctx, &m_object_map, m_snap_id, new_size, default_object_state,
213	on_finish);
214	req->send();
215	}
216
217	template <typename I>
218	void ObjectMap<I>::detained_aio_update(UpdateOperation &&op) {
219	CephContext *cct = m_image_ctx.cct;
220	ldout(cct, 20) << dendl;
221
222	assert(m_image_ctx.snap_lock.is_locked());
223	assert(m_image_ctx.object_map_lock.is_wlocked());
224
225	BlockGuardCell *cell;
226	int r = m_update_guard->detain({op.start_object_no, op.end_object_no},
227	&op, &cell);
228	if (r < 0) {
229	lderr(cct) << "failed to detain object map update: " << cpp_strerror(r)
230	<< dendl;
231	m_image_ctx.op_work_queue->queue(op.on_finish, r);
232	return;
233	} else if (r > 0) {
234	ldout(cct, 20) << "detaining object map update due to in-flight update: "
235	<< "start=" << op.start_object_no << ", "
236	<< "end=" << op.end_object_no << ", "
237	<< (op.current_state ?
238	stringify(static_cast<uint32_t>(*op.current_state)) :
239	"")
240	<< "->" << static_cast<uint32_t>(op.new_state) << dendl;
241	return;
242	}
243
244	ldout(cct, 20) << "in-flight update cell: " << cell << dendl;
245	Context *on_finish = op.on_finish;
246	Context *ctx = new FunctionContext([this, cell, on_finish](int r) {
247	handle_detained_aio_update(cell, r, on_finish);
248	});
249	aio_update(CEPH_NOSNAP, op.start_object_no, op.end_object_no, op.new_state,
31f18b77	250	op.current_state, op.parent_trace, ctx);
7c673cae FG	251	}
	252
	253	template <typename I>
	254	void ObjectMap<I>::handle_detained_aio_update(BlockGuardCell *cell, int r,
	255	Context *on_finish) {
	256	CephContext *cct = m_image_ctx.cct;
	257	ldout(cct, 20) << "cell=" << cell << ", r=" << r << dendl;
	258
	259	typename UpdateGuard::BlockOperations block_ops;
	260	m_update_guard->release(cell, &block_ops);
	261
	262	{
	263	RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
	264	RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
	265	for (auto &op : block_ops) {
	266	detained_aio_update(std::move(op));
	267	}
	268	}
	269
	270	on_finish->complete(r);
	271	}
	272
	273	template <typename I>
	274	void ObjectMap<I>::aio_update(uint64_t snap_id, uint64_t start_object_no,
	275	uint64_t end_object_no, uint8_t new_state,
	276	const boost::optional<uint8_t> &current_state,
31f18b77	277	const ZTracer::Trace &parent_trace,
7c673cae FG	278	Context *on_finish) {
	279	assert(m_image_ctx.snap_lock.is_locked());
	280	assert((m_image_ctx.features & RBD_FEATURE_OBJECT_MAP) != 0);
	281	assert(m_image_ctx.image_watcher != nullptr);
	282	assert(m_image_ctx.exclusive_lock == nullptr \|\|
	283	m_image_ctx.exclusive_lock->is_lock_owner());
	284	assert(snap_id != CEPH_NOSNAP \|\| m_image_ctx.object_map_lock.is_wlocked());
	285	assert(start_object_no < end_object_no);
	286
	287	CephContext *cct = m_image_ctx.cct;
	288	ldout(cct, 20) << "start=" << start_object_no << ", "
	289	<< "end=" << end_object_no << ", "
	290	<< (current_state ?
	291	stringify(static_cast<uint32_t>(*current_state)) : "")
	292	<< "->" << static_cast<uint32_t>(new_state) << dendl;
	293	if (snap_id == CEPH_NOSNAP) {
	294	if (end_object_no > m_object_map.size()) {
	295	ldout(cct, 20) << "skipping update of invalid object map" << dendl;
	296	m_image_ctx.op_work_queue->queue(on_finish, 0);
	297	return;
	298	}
	299
	300	uint64_t object_no;
	301	for (object_no = start_object_no; object_no < end_object_no; ++object_no) {
	302	if (update_required(object_no, new_state)) {
	303	break;
	304	}
	305	}
	306	if (object_no == end_object_no) {
	307	ldout(cct, 20) << "object map update not required" << dendl;
	308	m_image_ctx.op_work_queue->queue(on_finish, 0);
	309	return;
	310	}
	311	}
	312
	313	auto req = object_map::UpdateRequest<I>::create(
	314	m_image_ctx, &m_object_map, snap_id, start_object_no, end_object_no,
31f18b77	315	new_state, current_state, parent_trace, on_finish);
7c673cae FG	316	req->send();
	317	}
	318
	319	} // namespace librbd
	320
	321	template class librbd::ObjectMap<librbd::ImageCtx>;
	322