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extent_placement_manager.cc
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/
extent_placement_manager.cc
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:nil -*-
// vim: ts=8 sw=2 smarttab expandtab
#include "crimson/os/seastore/journal.h"
#include "crimson/os/seastore/extent_placement_manager.h"
namespace {
seastar::logger& logger() {
return crimson::get_logger(ceph_subsys_seastore);
}
}
namespace crimson::os::seastore {
SegmentedAllocator::SegmentedAllocator(
SegmentProvider& sp,
SegmentManager& sm,
LBAManager& lba_manager,
Journal& journal,
Cache& cache)
: segment_provider(sp),
segment_manager(sm),
lba_manager(lba_manager),
journal(journal),
cache(cache)
{
std::generate_n(
std::back_inserter(writers),
crimson::common::get_conf<uint64_t>(
"seastore_init_rewrite_segments_num_per_device"),
[&] {
return Writer{
segment_provider,
segment_manager,
lba_manager,
journal,
cache};
});
}
SegmentedAllocator::Writer::finish_record_ret
SegmentedAllocator::Writer::finish_write(
Transaction& t,
ool_record_t& record) {
return trans_intr::do_for_each(record.get_extents(),
[this, &t](auto& ool_extent) {
LOG_PREFIX(SegmentedAllocator::Writer::finish_write);
auto& lextent = ool_extent.get_lextent();
DEBUGT("extent: {}, ool_paddr: {}",
t,
*lextent,
ool_extent.get_ool_paddr());
return lba_manager.update_mapping(
t,
lextent->get_laddr(),
lextent->get_paddr(),
ool_extent.get_ool_paddr()
).si_then([&ool_extent, &t, &lextent, this] {
lextent->backend_type = device_type_t::NONE;
lextent->hint = {};
cache.mark_delayed_extent_ool(t, lextent, ool_extent.get_ool_paddr());
return finish_record_iertr::now();
});
}).si_then([&record] {
record.clear();
});
}
SegmentedAllocator::Writer::write_iertr::future<>
SegmentedAllocator::Writer::_write(
Transaction& t,
ool_record_t& record)
{
record_size_t record_size = record.get_encoded_record_length();
allocated_to += record_size.mdlength + record_size.dlength;
bufferlist bl = record.encode(
record_size,
current_segment->segment->get_segment_id(),
0);
seastar::promise<> pr;
current_segment->inflight_writes.emplace_back(pr.get_future());
LOG_PREFIX(SegmentedAllocator::Writer::_write);
DEBUGT(
"written {} extents, {} bytes to segment {} at {}",
t,
record.get_num_extents(),
bl.length(),
current_segment->segment->get_segment_id(),
record.get_base());
// account transactional ool writes before write()
auto& stats = t.get_ool_write_stats();
stats.extents.num += record.get_num_extents();
stats.extents.bytes += record_size.dlength;
stats.header_raw_bytes += record_size.raw_mdlength;
stats.header_bytes += record_size.mdlength;
stats.num_records += 1;
return trans_intr::make_interruptible(
current_segment->segment->write(record.get_base(), bl).safe_then(
[this, pr=std::move(pr), &t,
it=(--current_segment->inflight_writes.end()),
cs=current_segment]() mutable {
LOG_PREFIX(SegmentedAllocator::Writer::_write);
if (cs->outdated) {
DEBUGT("segment rolled", t);
pr.set_value();
} else{
DEBUGT("segment not rolled", t);
current_segment->inflight_writes.erase(it);
}
return seastar::now();
})
).si_then([this, &record, &t]() mutable {
return finish_write(t, record);
});
}
void SegmentedAllocator::Writer::add_extent_to_write(
ool_record_t& record,
LogicalCachedExtentRef& extent) {
logger().debug(
"SegmentedAllocator::Writer::add_extent_to_write: "
"add extent {} to record",
extent);
extent->prepare_write();
record.add_extent(extent);
}
SegmentedAllocator::Writer::write_iertr::future<>
SegmentedAllocator::Writer::write(
Transaction& t,
std::list<LogicalCachedExtentRef>& extents)
{
auto write_func = [this, &extents, &t] {
return seastar::do_with(ool_record_t(segment_manager.get_block_size()),
[this, &extents, &t](auto& record) {
return trans_intr::repeat([this, &record, &t, &extents]()
-> write_iertr::future<seastar::stop_iteration> {
if (extents.empty()) {
return seastar::make_ready_future<
seastar::stop_iteration>(seastar::stop_iteration::yes);
}
return segment_rotation_guard.wait(
[this] {
return !rolling_segment;
},
[this, &record, &extents, &t]() -> write_iertr::future<> {
LOG_PREFIX(SegmentedAllocator::Writer::write);
record.set_base(allocated_to);
for (auto it = extents.begin();
it != extents.end();) {
auto& extent = *it;
auto wouldbe_length =
record.get_wouldbe_encoded_record_length(extent);
if (_needs_roll(wouldbe_length)) {
// reached the segment end, write and roll
assert(!rolling_segment);
rolling_segment = true;
auto num_extents = record.get_num_extents();
DEBUGT(
"end of segment, writing {} extents to segment {} at {}",
t,
num_extents,
current_segment->segment->get_segment_id(),
allocated_to);
return (num_extents ?
_write(t, record) :
write_iertr::now()
).si_then([this]() mutable {
return roll_segment(false);
}).finally([this] {
rolling_segment = false;
segment_rotation_guard.broadcast();
});
}
add_extent_to_write(record, extent);
it = extents.erase(it);
}
DEBUGT(
"writing {} extents to segment {} at {}",
t,
record.get_num_extents(),
current_segment->segment->get_segment_id(),
allocated_to);
return _write(t, record);
}
).si_then([]()
-> write_iertr::future<seastar::stop_iteration> {
return seastar::make_ready_future<
seastar::stop_iteration>(seastar::stop_iteration::no);
});
});
});
};
if (rolling_segment) {
return segment_rotation_guard.wait([this] {
return !rolling_segment;
}, std::move(write_func));
} else if (!current_segment) {
return trans_intr::make_interruptible(roll_segment(true)).si_then(
[write_func=std::move(write_func)] {
return write_func();
});
}
return write_func();
}
bool SegmentedAllocator::Writer::_needs_roll(segment_off_t length) const {
return allocated_to + length > current_segment->segment->get_write_capacity();
}
SegmentedAllocator::Writer::init_segment_ertr::future<>
SegmentedAllocator::Writer::init_segment(Segment& segment) {
bufferptr bp(
ceph::buffer::create_page_aligned(
segment_manager.get_block_size()));
bp.zero();
auto header =segment_header_t{
journal.next_journal_segment_seq - 1, // current seg seq = next seg seq - 1
segment.get_segment_id(),
NO_DELTAS, 0, true};
logger().debug("SegmentedAllocator::Writer::init_segment: initting {}, {}",
segment.get_segment_id(),
header);
ceph::bufferlist bl;
encode(header, bl);
bl.cbegin().copy(bl.length(), bp.c_str());
bl.clear();
bl.append(bp);
allocated_to = segment_manager.get_block_size();
return segment.write(0, bl).handle_error(
crimson::ct_error::input_output_error::pass_further{},
crimson::ct_error::assert_all{
"Invalid error when initing segment"}
);
}
SegmentedAllocator::Writer::roll_segment_ertr::future<>
SegmentedAllocator::Writer::roll_segment(bool set_rolling) {
LOG_PREFIX(SegmentedAllocator::Writer::roll_segment);
DEBUG("set_rolling {}", set_rolling);
if (set_rolling) {
rolling_segment = true;
}
assert(rolling_segment);
if (current_segment) {
(void) seastar::with_gate(writer_guard, [this] {
auto fut = seastar::now();
if (!current_segment->inflight_writes.empty()) {
fut = seastar::when_all_succeed(
current_segment->inflight_writes.begin(),
current_segment->inflight_writes.end());
}
current_segment->outdated = true;
return fut.then(
[cs=std::move(current_segment), this, it=(--open_segments.end())] {
return cs->segment->close().safe_then([this, cs, it] {
LOG_PREFIX(SegmentedAllocator::Writer::roll_segment);
assert((*it).get() == cs.get());
segment_provider.close_segment(cs->segment->get_segment_id());
open_segments.erase(it);
DEBUG("closed segment: {}", cs->segment->get_segment_id());
});
});
}).handle_exception_type([](seastar::gate_closed_exception e) {
LOG_PREFIX(SegmentedAllocator::Writer::roll_segment);
DEBUG(" writer_guard closed, should be stopping");
return seastar::now();
});
}
return segment_provider.get_segment().safe_then([this](auto segment) {
return segment_manager.open(segment);
}).safe_then([this](auto segref) {
LOG_PREFIX(SegmentedAllocator::Writer::roll_segment);
DEBUG("opened new segment: {}", segref->get_segment_id());
return init_segment(*segref).safe_then([segref=std::move(segref), this] {
LOG_PREFIX(SegmentedAllocator::Writer::roll_segment);
assert(!current_segment.get());
current_segment.reset(new open_segment_wrapper_t());
current_segment->segment = segref;
open_segments.emplace_back(current_segment);
rolling_segment = false;
segment_rotation_guard.broadcast();
DEBUG("inited new segment: {}", segref->get_segment_id());
});
}).handle_error(
roll_segment_ertr::pass_further{},
crimson::ct_error::all_same_way([] { ceph_assert(0 == "TODO"); })
);
}
}