ceph/src/os/bluestore/BitmapFreelistManager.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
   5 #define CEPH_OS_BLUESTORE_BITMAPFREELISTMANAGER_H
   6
   7 #include "FreelistManager.h"
   8
   9 #include <string>
  10 #include <mutex>
  11
  12 #include "include/buffer.h"
  13 #include "kv/KeyValueDB.h"
  14
  15 class BitmapFreelistManager : public FreelistManager {
  16   std::string meta_prefix, bitmap_prefix;
  17   KeyValueDB *kvdb;
  18   ceph::shared_ptr<KeyValueDB::MergeOperator> merge_op;
  19   std::mutex lock;
  20
  21   uint64_t size;            ///< size of device (bytes)
  22   uint64_t bytes_per_block; ///< bytes per block (bdev_block_size)
  23   uint64_t blocks_per_key;  ///< blocks (bits) per key/value pair
  24   uint64_t bytes_per_key;   ///< bytes per key/value pair
  25   uint64_t blocks;          ///< size of device (blocks, size rounded up)
  26
  27   uint64_t block_mask;  ///< mask to convert byte offset to block offset
  28   uint64_t key_mask;    ///< mask to convert offset to key offset
  29
  30   bufferlist all_set_bl;
  31
  32   KeyValueDB::Iterator enumerate_p;
  33   uint64_t enumerate_offset; ///< logical offset; position
  34   bufferlist enumerate_bl;   ///< current key at enumerate_offset
  35   int enumerate_bl_pos;      ///< bit position in enumerate_bl
  36
  37   uint64_t _get_offset(uint64_t key_off, int bit) {
  38     return key_off + bit * bytes_per_block;
  39   }
  40
  41   void _init_misc();
  42
  43   void _verify_range(uint64_t offset, uint64_t length, int val);
  44   void _xor(
  45     uint64_t offset, uint64_t length,
  46     KeyValueDB::Transaction txn);
  47
  48 public:
  49   BitmapFreelistManager(CephContext* cct, KeyValueDB *db, string meta_prefix,
  50                         string bitmap_prefix);
  51
  52   static void setup_merge_operator(KeyValueDB *db, string prefix);
  53
  54   int create(uint64_t size, uint64_t granularity,
  55              KeyValueDB::Transaction txn) override;
  56
  57   int init(uint64_t dev_size) override;
  58   void shutdown() override;
  59
  60   void dump() override;
  61
  62   void enumerate_reset() override;
  63   bool enumerate_next(uint64_t *offset, uint64_t *length) override;
  64
  65   void allocate(
  66     uint64_t offset, uint64_t length,
  67     KeyValueDB::Transaction txn) override;
  68   void release(
  69     uint64_t offset, uint64_t length,
  70     KeyValueDB::Transaction txn) override;
  71
  72   inline uint64_t get_alloc_units() const override {
  73     return size / bytes_per_block;
  74   }
  75   inline uint64_t get_alloc_size() const override {
  76     return bytes_per_block;
  77   }
  78
  79 };
  80
  81 #endif