1 files changed, 72 insertions, 0 deletions
diff --git a/src/os/bluestore/Allocator.h b/src/os/bluestore/Allocator.h
new file mode 100644
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+++ b/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/ceph_assert.h"
+#include "os/bluestore/bluestore_types.h"
+#include <functional>
+
+class Allocator {
+public:
+  explicit Allocator(const std::string& name);
+  virtual ~Allocator();
+
+  /*
+   * 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,
+			   PExtentVector *extents) = 0;
+
+  int64_t allocate(uint64_t want_size, uint64_t alloc_unit,
+		   int64_t hint, PExtentVector *extents) {
+    return allocate(want_size, alloc_unit, 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 dump(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, string type, int64_t size,
+			   int64_t block_size, const std::string& name = "");
+
+  const string& get_name() const;
+
+private:
+  class SocketHook;
+  SocketHook* asok_hook = nullptr;
+};
+
+#endif