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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
//
// A freelist manager for zoned devices. This iteration just keeps the write
// pointer per zone. Following iterations will add enough information to enable
// cleaning of zones.
//
// Copyright (C) 2020 Abutalib Aghayev
//
#ifndef CEPH_OS_BLUESTORE_ZONEDFREELISTMANAGER_H
#define CEPH_OS_BLUESTORE_ZONEDFREELISTMANAGER_H
#include "FreelistManager.h"
#include <string>
#include <mutex>
#include "common/ceph_mutex.h"
#include "include/buffer.h"
#include "kv/KeyValueDB.h"
using cfg_reader_t = std::function<int(const std::string&, std::string*)>;
class ZonedFreelistManager : public FreelistManager {
std::string meta_prefix; ///< device size, zone size, etc.
std::string info_prefix; ///< per zone write pointer, dead bytes
mutable ceph::mutex lock = ceph::make_mutex("ZonedFreelistManager::lock");
uint64_t size; ///< size of sequential region (bytes)
uint64_t bytes_per_block; ///< bytes per allocation unit (bytes)
uint64_t zone_size; ///< size of a single zone (bytes)
uint64_t num_zones; ///< number of sequential zones
uint64_t starting_zone_num; ///< the first sequential zone number
KeyValueDB::Iterator enumerate_p;
uint64_t enumerate_zone_num;
void write_zone_state_to_db(uint64_t zone_num,
const zone_state_t &zone_state,
KeyValueDB::Transaction txn);
void load_zone_state_from_db(uint64_t zone_num,
zone_state_t &zone_state,
KeyValueDB::Iterator &it) const;
void init_zone_states(KeyValueDB::Transaction txn);
void increment_write_pointer(
uint64_t zone, uint64_t length, KeyValueDB::Transaction txn);
void increment_num_dead_bytes(
uint64_t zone, uint64_t num_bytes, KeyValueDB::Transaction txn);
int _read_cfg(cfg_reader_t cfg_reader);
public:
ZonedFreelistManager(CephContext* cct,
std::string meta_prefix,
std::string info_prefix);
static void setup_merge_operator(KeyValueDB *db, std::string prefix);
int create(uint64_t size,
uint64_t granularity,
KeyValueDB::Transaction txn) override;
int init(KeyValueDB *kvdb,
bool db_in_read_only,
cfg_reader_t cfg_reader) override;
void shutdown() override;
void sync(KeyValueDB* kvdb) override;
void dump(KeyValueDB *kvdb) override;
void enumerate_reset() override;
bool enumerate_next(KeyValueDB *kvdb,
uint64_t *offset,
uint64_t *length) override;
void allocate(uint64_t offset,
uint64_t length,
KeyValueDB::Transaction txn) override;
void release(uint64_t offset,
uint64_t length,
KeyValueDB::Transaction txn) override;
inline uint64_t get_size() const override {
return size;
}
inline uint64_t get_alloc_units() const override {
return size / bytes_per_block;
}
inline uint64_t get_alloc_size() const override {
return bytes_per_block;
}
void get_meta(uint64_t target_size,
std::vector<std::pair<string, string>>*) const override;
std::vector<zone_state_t> get_zone_states(KeyValueDB *kvdb) const override;
};
#endif
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