initial code repo

[stor4nfv.git] / src / ceph / src / os / bluestore / Allocator.h

diff --git a/src/ceph/src/os/bluestore/Allocator.h b/src/ceph/src/os/bluestore/Allocator.h
new file mode 100644 (file)
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+++ b/src/ceph/src/os/bluestore/Allocator.h
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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 <ostream>
+#include "include/assert.h"
+#include "os/bluestore/bluestore_types.h"
+
+class FreelistManager;
+
+class Allocator {
+public:
+  virtual ~Allocator() {}
+
+  virtual int reserve(uint64_t need) = 0;
+  virtual void unreserve(uint64_t unused) = 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 alloc_unit 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 alloc_unit,
+                          uint64_t max_alloc_size, int64_t hint,
+                          AllocExtentVector *extents) = 0;
+
+  int64_t allocate(uint64_t want_size, uint64_t alloc_unit,
+                  int64_t hint, AllocExtentVector *extents) {
+    return allocate(want_size, alloc_unit, want_size, hint, extents);
+  }
+
+  virtual void release(
+    uint64_t offset, uint64_t length) = 0;
+
+  virtual void dump() = 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 void shutdown() = 0;
+  static Allocator *create(CephContext* cct, string type, int64_t size,
+                          int64_t block_size);
+};
+
+#endif