1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 * Ceph - scalable distributed file system
6 * This is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License version 2.1, as published by the Free Software
9 * Foundation. See file COPYING.
12 #ifndef CEPH_OS_BLUESTORE_ALLOCATOR_H
13 #define CEPH_OS_BLUESTORE_ALLOCATOR_H
16 #include "include/assert.h"
17 #include "os/bluestore/bluestore_types.h"
19 class FreelistManager;
23 virtual ~Allocator() {}
25 virtual int reserve(uint64_t need) = 0;
26 virtual void unreserve(uint64_t unused) = 0;
29 * Allocate required number of blocks in n number of extents.
30 * Min and Max number of extents are limited by:
33 * as no extent can be lesser than alloc_unit and greater than max_alloc size.
34 * Apart from that extents can vary between these lower and higher limits according
35 * to free block search algorithm and availability of contiguous space.
37 virtual int64_t allocate(uint64_t want_size, uint64_t alloc_unit,
38 uint64_t max_alloc_size, int64_t hint,
39 AllocExtentVector *extents) = 0;
41 int64_t allocate(uint64_t want_size, uint64_t alloc_unit,
42 int64_t hint, AllocExtentVector *extents) {
43 return allocate(want_size, alloc_unit, want_size, hint, extents);
47 uint64_t offset, uint64_t length) = 0;
49 virtual void dump() = 0;
51 virtual void init_add_free(uint64_t offset, uint64_t length) = 0;
52 virtual void init_rm_free(uint64_t offset, uint64_t length) = 0;
54 virtual uint64_t get_free() = 0;
56 virtual void shutdown() = 0;
57 static Allocator *create(CephContext* cct, string type, int64_t size,