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ObjectCopyRequest.cc
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ObjectCopyRequest.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "ObjectCopyRequest.h"
#include "common/errno.h"
#include "librados/snap_set_diff.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ObjectMap.h"
#include "librbd/Utils.h"
#include "osdc/Striper.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::deep_copy::ObjectCopyRequest: " \
<< this << " " << __func__ << ": "
namespace librados {
inline bool operator==(const clone_info_t& rhs, const clone_info_t& lhs) {
return (rhs.cloneid == lhs.cloneid &&
rhs.snaps == lhs.snaps &&
rhs.overlap == lhs.overlap &&
rhs.size == lhs.size);
}
inline bool operator==(const snap_set_t& rhs, const snap_set_t& lhs) {
return (rhs.clones == lhs.clones &&
rhs.seq == lhs.seq);
}
} // namespace librados
namespace librbd {
namespace deep_copy {
using librbd::util::create_context_callback;
using librbd::util::create_rados_callback;
template <typename I>
ObjectCopyRequest<I>::ObjectCopyRequest(I *src_image_ctx, I *dst_image_ctx,
const SnapMap &snap_map,
uint64_t dst_object_number,
Context *on_finish)
: m_src_image_ctx(src_image_ctx), m_dst_image_ctx(dst_image_ctx),
m_cct(dst_image_ctx->cct), m_snap_map(snap_map),
m_dst_object_number(dst_object_number), m_on_finish(on_finish) {
assert(!m_snap_map.empty());
m_src_io_ctx.dup(m_src_image_ctx->data_ctx);
m_dst_io_ctx.dup(m_dst_image_ctx->data_ctx);
m_dst_oid = m_dst_image_ctx->get_object_name(dst_object_number);
ldout(m_cct, 20) << "dst_oid=" << m_dst_oid << dendl;
compute_src_object_extents();
}
template <typename I>
void ObjectCopyRequest<I>::send() {
send_list_snaps();
}
template <typename I>
void ObjectCopyRequest<I>::send_list_snaps() {
assert(!m_src_objects.empty());
m_src_ono = *m_src_objects.begin();
m_src_oid = m_src_image_ctx->get_object_name(m_src_ono);
ldout(m_cct, 20) << "src_oid=" << m_src_oid << dendl;
librados::AioCompletion *rados_completion = create_rados_callback<
ObjectCopyRequest<I>, &ObjectCopyRequest<I>::handle_list_snaps>(this);
librados::ObjectReadOperation op;
m_snap_set = {};
m_snap_ret = 0;
op.list_snaps(&m_snap_set, &m_snap_ret);
m_src_io_ctx.snap_set_read(CEPH_SNAPDIR);
int r = m_src_io_ctx.aio_operate(m_src_oid, rados_completion, &op,
nullptr);
assert(r == 0);
rados_completion->release();
}
template <typename I>
void ObjectCopyRequest<I>::handle_list_snaps(int r) {
if (r == 0 && m_snap_ret < 0) {
r = m_snap_ret;
}
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == -ENOENT) {
r = 0;
}
if (r < 0) {
lderr(m_cct) << "failed to list snaps: " << cpp_strerror(r) << dendl;
finish(r);
return;
}
if (m_retry_missing_read) {
if (m_snap_set == m_retry_snap_set) {
lderr(m_cct) << "read encountered missing object using up-to-date snap set"
<< dendl;
finish(-ENOENT);
return;
}
ldout(m_cct, 20) << "retrying using updated snap set" << dendl;
m_retry_missing_read = false;
m_retry_snap_set = {};
}
compute_read_ops();
send_read_object();
}
template <typename I>
void ObjectCopyRequest<I>::send_read_object() {
if (m_read_snaps.empty()) {
// all snapshots have been read
merge_write_ops();
assert(!m_src_objects.empty());
m_src_objects.erase(m_src_objects.begin());
if (!m_src_objects.empty()) {
send_list_snaps();
return;
}
// all objects have been read
compute_zero_ops();
if (m_write_ops.empty()) {
// nothing to copy
finish(0);
return;
}
send_write_object();
return;
}
auto index = *m_read_snaps.begin();
auto src_snap_seq = index.second;
bool read_required = false;
librados::ObjectReadOperation op;
for (auto ©_op : m_read_ops[index]) {
if (!read_required) {
// map the copy op start snap id back to the necessary read snap id
m_src_io_ctx.snap_set_read(src_snap_seq);
ldout(m_cct, 20) << "src_snap_seq=" << src_snap_seq << dendl;
read_required = true;
}
ldout(m_cct, 20) << "read op: " << copy_op.src_offset << "~"
<< copy_op.length << dendl;
op.sparse_read(copy_op.src_offset, copy_op.length, ©_op.src_extent_map,
©_op.out_bl, nullptr);
op.set_op_flags2(LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL |
LIBRADOS_OP_FLAG_FADVISE_NOCACHE);
}
if (!read_required) {
// nothing written to this object for this snapshot (must be trunc/remove)
handle_read_object(0);
}
auto ctx = create_context_callback<
ObjectCopyRequest<I>, &ObjectCopyRequest<I>::handle_read_object>(this);
auto comp = create_rados_callback(ctx);
ldout(m_cct, 20) << "read " << m_src_oid << dendl;
int r = m_src_io_ctx.aio_operate(m_src_oid, comp, &op, nullptr);
assert(r == 0);
comp->release();
}
template <typename I>
void ObjectCopyRequest<I>::handle_read_object(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == -ENOENT && m_read_whole_object) {
ldout(m_cct, 5) << "object missing when forced to read whole object"
<< dendl;
r = 0;
}
if (r == -ENOENT) {
m_retry_snap_set = m_snap_set;
m_retry_missing_read = true;
ldout(m_cct, 5) << "object missing potentially due to removed snapshot"
<< dendl;
send_list_snaps();
return;
}
if (r < 0) {
lderr(m_cct) << "failed to read from source object: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
assert(!m_read_snaps.empty());
m_read_snaps.erase(m_read_snaps.begin());
send_read_object();
}
template <typename I>
void ObjectCopyRequest<I>::send_write_object() {
assert(!m_write_ops.empty());
// retrieve the destination snap context for the op
SnapIds dst_snap_ids;
librados::snap_t dst_snap_seq = 0;
librados::snap_t src_snap_seq = m_write_ops.begin()->first;
if (src_snap_seq != 0) {
auto snap_map_it = m_snap_map.find(src_snap_seq);
assert(snap_map_it != m_snap_map.end());
// write snapshot context should be before actual snapshot
if (snap_map_it != m_snap_map.begin()) {
--snap_map_it;
assert(!snap_map_it->second.empty());
dst_snap_seq = snap_map_it->second.front();
dst_snap_ids = snap_map_it->second;
}
}
ldout(m_cct, 20) << "dst_snap_seq=" << dst_snap_seq << ", "
<< "dst_snaps=" << dst_snap_ids << dendl;
librados::ObjectWriteOperation op;
uint64_t buffer_offset;
for (auto ©_op : m_write_ops.begin()->second) {
switch (copy_op.type) {
case COPY_OP_TYPE_WRITE:
buffer_offset = 0;
for (auto &e : copy_op.dst_extent_map) {
ldout(m_cct, 20) << "write op: " << e.first << "~" << e.second
<< dendl;
bufferlist tmpbl;
tmpbl.substr_of(copy_op.out_bl, buffer_offset, e.second);
op.write(e.first, tmpbl);
op.set_op_flags2(LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL |
LIBRADOS_OP_FLAG_FADVISE_NOCACHE);
buffer_offset += e.second;
}
break;
case COPY_OP_TYPE_ZERO:
ldout(m_cct, 20) << "zero op: " << copy_op.dst_offset << "~"
<< copy_op.length << dendl;
op.zero(copy_op.dst_offset, copy_op.length);
break;
case COPY_OP_TYPE_TRUNC:
ldout(m_cct, 20) << "trunc op: " << copy_op.dst_offset << dendl;
op.truncate(copy_op.dst_offset);
break;
case COPY_OP_TYPE_REMOVE:
ldout(m_cct, 20) << "remove op" << dendl;
op.remove();
break;
default:
ceph_abort();
}
}
if (op.size() == 0) {
handle_write_object(0);
return;
}
Context *finish_op_ctx;
{
RWLock::RLocker owner_locker(m_dst_image_ctx->owner_lock);
finish_op_ctx = start_lock_op(m_dst_image_ctx->owner_lock);
}
if (finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
finish(-EROFS);
return;
}
auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
handle_write_object(r);
finish_op_ctx->complete(0);
});
librados::AioCompletion *comp = create_rados_callback(ctx);
int r = m_dst_io_ctx.aio_operate(m_dst_oid, comp, &op, dst_snap_seq,
dst_snap_ids);
assert(r == 0);
comp->release();
}
template <typename I>
void ObjectCopyRequest<I>::handle_write_object(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
if (r == -ENOENT) {
r = 0;
}
if (r < 0) {
lderr(m_cct) << "failed to write to destination object: " << cpp_strerror(r)
<< dendl;
finish(r);
return;
}
m_write_ops.erase(m_write_ops.begin());
if (!m_write_ops.empty()) {
send_write_object();
return;
}
send_update_object_map();
}
template <typename I>
void ObjectCopyRequest<I>::send_update_object_map() {
if (!m_dst_image_ctx->test_features(RBD_FEATURE_OBJECT_MAP) ||
m_dst_object_state.empty()) {
finish(0);
return;
}
m_dst_image_ctx->owner_lock.get_read();
m_dst_image_ctx->snap_lock.get_read();
if (m_dst_image_ctx->object_map == nullptr) {
// possible that exclusive lock was lost in background
lderr(m_cct) << "object map is not initialized" << dendl;
m_dst_image_ctx->snap_lock.put_read();
m_dst_image_ctx->owner_lock.put_read();
finish(-EINVAL);
return;
}
auto &dst_object_state = *m_dst_object_state.begin();
auto it = m_snap_map.find(dst_object_state.first);
assert(it != m_snap_map.end());
auto dst_snap_id = it->second.front();
auto object_state = dst_object_state.second;
m_dst_object_state.erase(m_dst_object_state.begin());
ldout(m_cct, 20) << "dst_snap_id=" << dst_snap_id << ", object_state="
<< static_cast<uint32_t>(object_state) << dendl;
auto finish_op_ctx = start_lock_op(m_dst_image_ctx->owner_lock);
if (finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
m_dst_image_ctx->snap_lock.put_read();
m_dst_image_ctx->owner_lock.put_read();
finish(-EROFS);
return;
}
auto ctx = new FunctionContext([this, finish_op_ctx](int r) {
handle_update_object_map(r);
finish_op_ctx->complete(0);
});
RWLock::WLocker object_map_locker(m_dst_image_ctx->object_map_lock);
bool sent = m_dst_image_ctx->object_map->template aio_update<
Context, &Context::complete>(dst_snap_id, m_dst_object_number, object_state,
{}, {}, ctx);
m_dst_image_ctx->snap_lock.put_read();
m_dst_image_ctx->owner_lock.put_read();
if (!sent) {
assert(dst_snap_id == CEPH_NOSNAP);
handle_update_object_map(0);
}
}
template <typename I>
void ObjectCopyRequest<I>::handle_update_object_map(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
assert(r == 0);
if (!m_dst_object_state.empty()) {
send_update_object_map();
return;
}
finish(0);
}
template <typename I>
Context *ObjectCopyRequest<I>::start_lock_op(RWLock &owner_lock) {
assert(m_dst_image_ctx->owner_lock.is_locked());
if (m_dst_image_ctx->exclusive_lock == nullptr) {
return new FunctionContext([](int r) {});
}
return m_dst_image_ctx->exclusive_lock->start_op();
}
template <typename I>
uint64_t ObjectCopyRequest<I>::src_to_dst_object_offset(uint64_t objectno,
uint64_t offset) {
std::vector<std::pair<uint64_t, uint64_t>> image_extents;
Striper::extent_to_file(m_cct, &m_src_image_ctx->layout, objectno, offset, 1,
image_extents);
assert(image_extents.size() == 1);
auto dst_object_offset = image_extents.begin()->first;
std::map<object_t, std::vector<ObjectExtent>> dst_object_extents;
Striper::file_to_extents(m_cct, m_dst_image_ctx->format_string,
&m_dst_image_ctx->layout, dst_object_offset, 1, 0,
dst_object_extents);
assert(dst_object_extents.size() == 1);
assert(dst_object_extents.begin()->second.size() == 1);
auto &e = *dst_object_extents.begin()->second.begin();
assert(e.objectno == m_dst_object_number);
return e.offset;
}
template <typename I>
void ObjectCopyRequest<I>::compute_src_object_extents() {
std::vector<std::pair<uint64_t, uint64_t>> image_extents;
Striper::extent_to_file(m_cct, &m_dst_image_ctx->layout, m_dst_object_number,
0, m_dst_image_ctx->layout.object_size, image_extents);
size_t total = 0;
for (auto &e : image_extents) {
std::map<object_t, std::vector<ObjectExtent>> src_object_extents;
Striper::file_to_extents(m_cct, m_src_image_ctx->format_string,
&m_src_image_ctx->layout, e.first, e.second, 0,
src_object_extents);
auto stripe_unit = std::min(m_src_image_ctx->layout.stripe_unit,
m_dst_image_ctx->layout.stripe_unit);
for (auto &p : src_object_extents) {
for (auto &s : p.second) {
m_src_objects.insert(s.objectno);
total += s.length;
while (s.length > 0) {
assert(s.length >= stripe_unit);
auto dst_object_offset = src_to_dst_object_offset(s.objectno, s.offset);
m_src_object_extents[dst_object_offset] = {s.objectno, s.offset,
stripe_unit};
s.offset += stripe_unit;
s.length -= stripe_unit;
}
}
}
}
assert(total == m_dst_image_ctx->layout.object_size);
ldout(m_cct, 20) << m_src_object_extents.size() << " src extents" << dendl;
}
template <typename I>
void ObjectCopyRequest<I>::compute_read_ops() {
m_read_ops = {};
m_read_snaps = {};
m_zero_interval = {};
librados::snap_t src_copy_point_snap_id = m_snap_map.rbegin()->first;
uint64_t prev_end_size = 0;
bool prev_exists = false;
librados::snap_t start_src_snap_id = 0;
for (auto &pair : m_snap_map) {
assert(!pair.second.empty());
librados::snap_t end_src_snap_id = pair.first;
librados::snap_t end_dst_snap_id = pair.second.front();
interval_set<uint64_t> diff;
uint64_t end_size;
bool exists;
librados::snap_t clone_end_snap_id;
calc_snap_set_diff(m_cct, m_snap_set, start_src_snap_id,
end_src_snap_id, &diff, &end_size, &exists,
&clone_end_snap_id, &m_read_whole_object);
if (m_read_whole_object) {
ldout(m_cct, 1) << "need to read full object" << dendl;
diff.insert(0, m_src_image_ctx->layout.object_size);
exists = true;
end_size = m_src_image_ctx->layout.object_size;
clone_end_snap_id = end_src_snap_id;
}
if (!exists) {
end_size = 0;
}
ldout(m_cct, 20) << "start_src_snap_id=" << start_src_snap_id << ", "
<< "end_src_snap_id=" << end_src_snap_id << ", "
<< "clone_end_snap_id=" << clone_end_snap_id << ", "
<< "end_dst_snap_id=" << end_dst_snap_id << ", "
<< "diff=" << diff << ", "
<< "end_size=" << end_size << ", "
<< "exists=" << exists << dendl;
m_zero_interval[end_src_snap_id] = {};
if (exists || prev_exists) {
// clip diff to size of object (in case it was truncated)
if (end_size < prev_end_size) {
interval_set<uint64_t> trunc;
trunc.insert(end_size, prev_end_size);
trunc.intersection_of(diff);
diff.subtract(trunc);
ldout(m_cct, 20) << "clearing truncate diff: " << trunc << dendl;
}
if (exists) {
// reads should be issued against the newest (existing) snapshot within
// the associated snapshot object clone. writes should be issued
// against the oldest snapshot in the snap_map.
assert(clone_end_snap_id >= end_src_snap_id);
if (clone_end_snap_id > src_copy_point_snap_id) {
// do not read past the copy point snapshot
clone_end_snap_id = src_copy_point_snap_id;
}
}
for (auto &it : m_src_object_extents) {
auto dst_object_offset = it.first;
auto &e = it.second;
if (e.object_no != m_src_ono) {
continue;
}
interval_set<uint64_t> read_interval;
read_interval.insert(e.offset, e.length);
if (end_size < prev_end_size) {
interval_set<uint64_t> zero_interval;
zero_interval.insert(end_size, prev_end_size - end_size);
zero_interval.intersection_of(read_interval);
if (!zero_interval.empty()) {
auto it = zero_interval.begin();
auto offset = it.get_start() - e.offset;
m_zero_interval[end_src_snap_id].insert(dst_object_offset + offset,
it.get_len());
ldout(m_cct, 20) << "extent " << e.offset << "~" << e.length
<< " intersects truncation " << end_size << "~"
<< prev_end_size - end_size << ", inserting zero "
<< dst_object_offset + offset << "~"
<< it.get_len() << dendl;
}
}
// limit read interval to diff
read_interval.intersection_of(diff);
ldout(m_cct, 20) << "src_object_extent: " << e.offset << "~" << e.length
<< ", dst_object_offset=" << dst_object_offset
<< ", read: " << read_interval << dendl;
assert(exists || read_interval.empty());
for (auto it = read_interval.begin(); it != read_interval.end();
it++) {
assert(it.get_start() >= e.offset);
auto offset = it.get_start() - e.offset;
ldout(m_cct, 20) << "read/write op: " << it.get_start() << "~"
<< it.get_len() << " dst: "
<< dst_object_offset + offset << dendl;
m_read_ops[{end_src_snap_id, clone_end_snap_id}]
.emplace_back(COPY_OP_TYPE_WRITE, it.get_start(),
dst_object_offset + offset, it.get_len());
}
}
}
prev_end_size = end_size;
prev_exists = exists;
start_src_snap_id = end_src_snap_id;
}
for (auto &it : m_read_ops) {
m_read_snaps.push_back(it.first);
}
}
template <typename I>
void ObjectCopyRequest<I>::merge_write_ops() {
ldout(m_cct, 20) << dendl;
for (auto &it : m_zero_interval) {
m_dst_zero_interval[it.first].insert(it.second);
}
for (auto &it : m_read_ops) {
auto src_snap_seq = it.first.first;
auto ©_ops = it.second;
for (auto ©_op : copy_ops) {
uint64_t src_offset = copy_op.src_offset;
uint64_t dst_offset = copy_op.dst_offset;
for (auto &e : copy_op.src_extent_map) {
uint64_t zero_len = e.first - src_offset;
if (zero_len > 0) {
ldout(m_cct, 20) << "src_snap_seq=" << src_snap_seq
<< ", inserting zero " << dst_offset << "~"
<< zero_len << dendl;
m_dst_zero_interval[src_snap_seq].insert(dst_offset, zero_len);
src_offset += zero_len;
dst_offset += zero_len;
}
copy_op.dst_extent_map[dst_offset] = e.second;
src_offset += e.second;
dst_offset += e.second;
}
if (dst_offset < copy_op.dst_offset + copy_op.length) {
uint64_t zero_len = copy_op.dst_offset + copy_op.length - dst_offset;
ldout(m_cct, 20) << "src_snap_seq=" << src_snap_seq
<< ", inserting zero " << dst_offset << "~"
<< zero_len << dendl;
m_dst_zero_interval[src_snap_seq].insert(dst_offset, zero_len);
} else {
assert(dst_offset == copy_op.dst_offset + copy_op.length);
}
m_write_ops[src_snap_seq].emplace_back(std::move(copy_op));
}
}
}
template <typename I>
void ObjectCopyRequest<I>::compute_zero_ops() {
ldout(m_cct, 20) << dendl;
bool fast_diff = m_dst_image_ctx->test_features(RBD_FEATURE_FAST_DIFF);
uint64_t prev_end_size = 0;
for (auto &it : m_dst_zero_interval) {
auto src_snap_seq = it.first;
auto &zero_interval = it.second;
uint64_t end_size = prev_end_size;
// update end_size if there are writes into higher offsets
auto iter = m_write_ops.find(src_snap_seq);
if (iter != m_write_ops.end()) {
for (auto ©_op : iter->second) {
for (auto &e : copy_op.dst_extent_map) {
end_size = std::max(end_size, e.first + e.second);
}
}
}
for (auto z = zero_interval.begin(); z != zero_interval.end(); z++) {
if (z.get_start() + z.get_len() >= end_size) {
// zero interval at the object end
if (z.get_start() < prev_end_size) {
if (z.get_start() == 0) {
m_write_ops[src_snap_seq]
.emplace_back(COPY_OP_TYPE_REMOVE, 0, 0, 0);
ldout(m_cct, 20) << "COPY_OP_TYPE_REMOVE" << dendl;
} else {
m_write_ops[src_snap_seq]
.emplace_back(COPY_OP_TYPE_TRUNC, 0, z.get_start(), 0);
ldout(m_cct, 20) << "COPY_OP_TYPE_TRUNC " << z.get_start() << dendl;
}
}
end_size = z.get_start();
} else {
// zero interval inside the object
m_write_ops[src_snap_seq]
.emplace_back(COPY_OP_TYPE_ZERO, 0, z.get_start(), z.get_len());
ldout(m_cct, 20) << "COPY_OP_TYPE_ZERO " << z.get_start() << "~"
<< z.get_len() << dendl;
}
}
ldout(m_cct, 20) << "src_snap_seq=" << src_snap_seq << ", end_size="
<< end_size << dendl;
if (end_size > 0) {
m_dst_object_state[src_snap_seq] = OBJECT_EXISTS;
if (fast_diff && end_size == prev_end_size &&
m_write_ops[src_snap_seq].empty()) {
m_dst_object_state[src_snap_seq] = OBJECT_EXISTS_CLEAN;
}
}
prev_end_size = end_size;
}
}
template <typename I>
void ObjectCopyRequest<I>::finish(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
// ensure IoCtxs are closed prior to proceeding
auto on_finish = m_on_finish;
delete this;
on_finish->complete(r);
}
} // namespace deep_copy
} // namespace librbd
template class librbd::deep_copy::ObjectCopyRequest<librbd::ImageCtx>;