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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_OS_BLUESTORE_ALLOCATOR_H
#define CEPH_OS_BLUESTORE_ALLOCATOR_H
#include <functional>
#include <ostream>
#include "include/ceph_assert.h"
#include "bluestore_types.h"
class Allocator {
public:
Allocator(std::string_view name,
int64_t _capacity,
int64_t _block_size);
virtual ~Allocator();
/*
* returns allocator type name as per names in config
*/
virtual const char* get_type() const = 0;
/*
* Allocate required number of blocks in n number of extents.
* Min and Max number of extents are limited by:
* a. alloc unit
* b. max_alloc_size.
* as no extent can be lesser than block_size and greater than max_alloc size.
* Apart from that extents can vary between these lower and higher limits according
* to free block search algorithm and availability of contiguous space.
*/
virtual int64_t allocate(uint64_t want_size, uint64_t block_size,
uint64_t max_alloc_size, int64_t hint,
PExtentVector *extents) = 0;
int64_t allocate(uint64_t want_size, uint64_t block_size,
int64_t hint, PExtentVector *extents) {
return allocate(want_size, block_size, want_size, hint, extents);
}
/* Bulk release. Implementations may override this method to handle the whole
* set at once. This could save e.g. unnecessary mutex dance. */
virtual void release(const interval_set<uint64_t>& release_set) = 0;
void release(const PExtentVector& release_set);
virtual void dump() = 0;
virtual void foreach(
std::function<void(uint64_t offset, uint64_t length)> notify) = 0;
virtual void init_add_free(uint64_t offset, uint64_t length) = 0;
virtual void init_rm_free(uint64_t offset, uint64_t length) = 0;
virtual uint64_t get_free() = 0;
virtual double get_fragmentation()
{
return 0.0;
}
virtual double get_fragmentation_score();
virtual void shutdown() = 0;
static Allocator *create(
CephContext* cct,
std::string_view type,
int64_t size,
int64_t block_size,
int64_t zone_size = 0,
int64_t firs_sequential_zone = 0,
const std::string_view name = ""
);
const std::string& get_name() const;
int64_t get_capacity() const
{
return device_size;
}
int64_t get_block_size() const
{
return block_size;
}
private:
class SocketHook;
SocketHook* asok_hook = nullptr;
protected:
const int64_t device_size = 0;
const int64_t block_size = 0;
};
#endif
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