initial code repo

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

diff --git a/src/ceph/src/os/bluestore/BitmapFreelistManager.h b/src/ceph/src/os/bluestore/BitmapFreelistManager.h
new file mode 100644 (file)
index 0000000..1098254
--- /dev/null
+++ b/src/ceph/src/os/bluestore/BitmapFreelistManager.h
@@ -0,0 +1,73 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
+#define CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
+
+#include "FreelistManager.h"
+
+#include <string>
+#include <mutex>
+
+#include "include/buffer.h"
+#include "kv/KeyValueDB.h"
+
+class BitmapFreelistManager : public FreelistManager {
+  std::string meta_prefix, bitmap_prefix;
+  KeyValueDB *kvdb;
+  ceph::shared_ptr<KeyValueDB::MergeOperator> merge_op;
+  std::mutex lock;
+
+  uint64_t size;            ///< size of device (bytes)
+  uint64_t bytes_per_block; ///< bytes per block (bdev_block_size)
+  uint64_t blocks_per_key;  ///< blocks (bits) per key/value pair
+  uint64_t bytes_per_key;   ///< bytes per key/value pair
+  uint64_t blocks;          ///< size of device (blocks, size rounded up)
+
+  uint64_t block_mask;  ///< mask to convert byte offset to block offset
+  uint64_t key_mask;    ///< mask to convert offset to key offset
+
+  bufferlist all_set_bl;
+
+  KeyValueDB::Iterator enumerate_p;
+  uint64_t enumerate_offset; ///< logical offset; position
+  bufferlist enumerate_bl;   ///< current key at enumerate_offset
+  int enumerate_bl_pos;      ///< bit position in enumerate_bl
+
+  uint64_t _get_offset(uint64_t key_off, int bit) {
+    return key_off + bit * bytes_per_block;
+  }
+
+  void _init_misc();
+
+  void _verify_range(uint64_t offset, uint64_t length, int val);
+  void _xor(
+    uint64_t offset, uint64_t length,
+    KeyValueDB::Transaction txn);
+
+public:
+  BitmapFreelistManager(CephContext* cct, KeyValueDB *db, string meta_prefix,
+                       string bitmap_prefix);
+
+  static void setup_merge_operator(KeyValueDB *db, string prefix);
+
+  int create(uint64_t size, uint64_t min_alloc_size,
+            KeyValueDB::Transaction txn) override;
+
+  int init(uint64_t dev_size) override;
+  void shutdown() override;
+
+  void dump() override;
+
+  void enumerate_reset() override;
+  bool enumerate_next(uint64_t *offset, uint64_t *length) override;
+
+  void allocate(
+    uint64_t offset, uint64_t length,
+    KeyValueDB::Transaction txn) override;
+  void release(
+    uint64_t offset, uint64_t length,
+    KeyValueDB::Transaction txn) override;
+};
+
+#endif