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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
//
// A simple allocator that just hands out space from the next empty zone. This
// is temporary, just to get the simplest append-only write workload to work.
//
// Copyright (C) 2020 Abutalib Aghayev
//
#ifndef CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
#define CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
#include <mutex>
#include "Allocator.h"
#include "common/ceph_mutex.h"
#include "include/btree_map.h"
#include "include/interval_set.h"
#include "include/mempool.h"
#include "bluestore_types.h"
#include "zoned_types.h"
class ZonedAllocator : public Allocator {
CephContext* cct;
// Currently only one thread at a time calls into ZonedAllocator due to
// atomic_alloc_and_submit_lock in BlueStore.cc, but we do locking anyway
// because eventually ZONE_APPEND support will land and
// atomic_alloc_and_submit_lock will be removed.
ceph::mutex lock = ceph::make_mutex("ZonedAllocator::lock");
std::atomic<int64_t> num_free; ///< total bytes in freelist
uint64_t size;
uint64_t block_size;
uint64_t zone_size;
uint64_t starting_zone_num;
uint64_t num_zones;
std::vector<zone_state_t> zone_states;
inline uint64_t get_offset(uint64_t zone_num) const {
return zone_num * zone_size + get_write_pointer(zone_num);
}
inline uint64_t get_write_pointer(uint64_t zone_num) const {
return zone_states[zone_num].get_write_pointer();
}
inline uint64_t get_remaining_space(uint64_t zone_num) const {
return zone_size - get_write_pointer(zone_num);
}
inline void advance_write_pointer(uint64_t zone_num, uint64_t want_size) {
zone_states[zone_num].increment_write_pointer(want_size);
}
inline bool fits(uint64_t want_size, uint64_t zone_num) const {
return want_size <= get_remaining_space(zone_num);
}
public:
ZonedAllocator(CephContext* cct, int64_t size, int64_t block_size,
const std::string& name);
~ZonedAllocator() override;
const char *get_type() const override {
return "zoned";
}
int64_t allocate(
uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
int64_t hint, PExtentVector *extents) override;
void release(const interval_set<uint64_t>& release_set) override;
uint64_t get_free() override;
void dump() override;
void foreach(
std::function<void(uint64_t offset, uint64_t length)> notify) override;
void zoned_set_zone_states(std::vector<zone_state_t> &&_zone_states) override;
bool zoned_get_zones_to_clean(std::deque<uint64_t> *zones_to_clean) override;
void init_add_free(uint64_t offset, uint64_t length) override;
void init_rm_free(uint64_t offset, uint64_t length) override;
void shutdown() override;
};
#endif
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