1 files changed, 91 insertions, 0 deletions
diff --git a/src/os/bluestore/ZonedAllocator.h b/src/os/bluestore/ZonedAllocator.h
new file mode 100644
index 000000000..47cb46be7
--- /dev/null
+++ b/src/os/bluestore/ZonedAllocator.h
@@ -0,0 +1,91 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+// 
+// A simple allocator that just hands out space from the next empty zone.  This
+// is temporary, just to get the simplest append-only write workload to work.
+//
+// Copyright (C) 2020 Abutalib Aghayev
+//
+
+#ifndef CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
+#define CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
+
+#include <mutex>
+
+#include "Allocator.h"
+#include "common/ceph_mutex.h"
+#include "include/btree_map.h"
+#include "include/interval_set.h"
+#include "include/mempool.h"
+#include "bluestore_types.h"
+#include "zoned_types.h"
+
+class ZonedAllocator : public Allocator {
+  CephContext* cct;
+
+  // Currently only one thread at a time calls into ZonedAllocator due to
+  // atomic_alloc_and_submit_lock in BlueStore.cc, but we do locking anyway
+  // because eventually ZONE_APPEND support will land and
+  // atomic_alloc_and_submit_lock will be removed.
+  ceph::mutex lock = ceph::make_mutex("ZonedAllocator::lock");
+
+  std::atomic<int64_t> num_free;     ///< total bytes in freelist
+  uint64_t size;
+  uint64_t block_size;
+  uint64_t zone_size;
+  uint64_t starting_zone_num;
+  uint64_t num_zones;
+  std::vector<zone_state_t> zone_states;
+
+  inline uint64_t get_offset(uint64_t zone_num) const {
+    return zone_num * zone_size + get_write_pointer(zone_num);
+  }
+
+  inline uint64_t get_write_pointer(uint64_t zone_num) const {
+    return zone_states[zone_num].get_write_pointer();
+  }
+
+  inline uint64_t get_remaining_space(uint64_t zone_num) const {
+    return zone_size - get_write_pointer(zone_num);
+  }
+
+  inline void advance_write_pointer(uint64_t zone_num, uint64_t want_size) {
+    zone_states[zone_num].increment_write_pointer(want_size);
+  }
+
+  inline bool fits(uint64_t want_size, uint64_t zone_num) const {
+    return want_size <= get_remaining_space(zone_num);
+  }
+
+public:
+  ZonedAllocator(CephContext* cct, int64_t size, int64_t block_size,
+                 const std::string& name);
+  ~ZonedAllocator() override;
+
+  const char *get_type() const override {
+    return "zoned";
+  }
+
+  int64_t allocate(
+    uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
+    int64_t hint, PExtentVector *extents) override;
+
+  void release(const interval_set<uint64_t>& release_set) override;
+
+  uint64_t get_free() override;
+
+  void dump() override;
+  void foreach(
+    std::function<void(uint64_t offset, uint64_t length)> notify) override;
+
+  void zoned_set_zone_states(std::vector<zone_state_t> &&_zone_states) override;
+  bool zoned_get_zones_to_clean(std::deque<uint64_t> *zones_to_clean) override;
+
+  void init_add_free(uint64_t offset, uint64_t length) override;
+  void init_rm_free(uint64_t offset, uint64_t length) override;
+
+  void shutdown() override;
+};
+
+#endif