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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
#define CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
#include "FreelistManager.h"
#include <string>
#include <mutex>
#include "common/ceph_mutex.h"
#include "include/buffer.h"
#include "kv/KeyValueDB.h"
class BitmapFreelistManager : public FreelistManager {
std::string meta_prefix, bitmap_prefix;
std::shared_ptr<KeyValueDB::MergeOperator> merge_op;
ceph::mutex lock = ceph::make_mutex("BitmapFreelistManager::lock");
uint64_t size; ///< size of device (bytes)
uint64_t bytes_per_block; ///< bytes per block (bdev_block_size)
uint64_t blocks_per_key; ///< blocks (bits) per key/value pair
uint64_t bytes_per_key; ///< bytes per key/value pair
uint64_t blocks; ///< size of device (blocks, size rounded up)
uint64_t block_mask; ///< mask to convert byte offset to block offset
uint64_t key_mask; ///< mask to convert offset to key offset
ceph::buffer::list all_set_bl;
KeyValueDB::Iterator enumerate_p;
uint64_t enumerate_offset; ///< logical offset; position
ceph::buffer::list enumerate_bl; ///< current key at enumerate_offset
int enumerate_bl_pos; ///< bit position in enumerate_bl
uint64_t _get_offset(uint64_t key_off, int bit) {
return key_off + bit * bytes_per_block;
}
void _init_misc();
void _xor(
uint64_t offset, uint64_t length,
KeyValueDB::Transaction txn);
int _read_cfg(
std::function<int(const std::string&, std::string*)> cfg_reader);
int _expand(uint64_t new_size, KeyValueDB* db);
uint64_t size_2_block_count(uint64_t target_size) const;
int read_size_meta_from_db(KeyValueDB* kvdb, uint64_t* res);
void _sync(KeyValueDB* kvdb, bool read_only);
void _load_from_db(KeyValueDB* kvdb);
public:
BitmapFreelistManager(CephContext* cct, std::string meta_prefix,
std::string bitmap_prefix);
static void setup_merge_operator(KeyValueDB *db, std::string prefix);
int create(uint64_t size, uint64_t granularity,
uint64_t zone_size, uint64_t first_sequential_zone,
KeyValueDB::Transaction txn) override;
int init(KeyValueDB *kvdb, bool db_in_read_only,
std::function<int(const std::string&, std::string*)> 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<std::string, std::string>>*) const override;
};
#endif
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