ceph/src/os/bluestore/zoned_types.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 #ifndef CEPH_OS_BLUESTORE_ZONED_TYPES_H
   4 #define CEPH_OS_BLUESTORE_ZONED_TYPES_H
   5
   6 #include "include/types.h"
   7 #include "kv/KeyValueDB.h"
   8 #include "os/kv.h"
   9
  10 // Tracks two bits of information about the state of a zone: (1) number of dead
  11 // bytes in a zone and (2) the write pointer.  We assume that for now 32 bits is
  12 // enough for the zone capacity and represent these as uint32_t, and we store
  13 // them as a single 64-bit value in RocksDB so that we can use the existing
  14 // Int64ArrayMergeOperator for merge and avoid the cost of point queries.
  15 //
  16 // We use the same struct for an on-disk and in-memory representation of the
  17 // state.
  18 struct zone_state_t {
  19   uint32_t num_dead_bytes = 0;
  20   uint32_t write_pointer = 0;
  21
  22   void encode(ceph::buffer::list &bl) const;
  23   void decode(ceph::buffer::list::const_iterator &p);
  24
  25   uint64_t get_num_dead_bytes() const {
  26     return num_dead_bytes;
  27   }
  28
  29   uint64_t get_write_pointer() const {
  30     return write_pointer;
  31   }
  32
  33   void increment_num_dead_bytes(uint64_t num_bytes) {
  34     num_dead_bytes += num_bytes;
  35   }
  36
  37   void increment_write_pointer(uint64_t num_bytes) {
  38     write_pointer += num_bytes;
  39   }
  40 };
  41
  42 std::ostream& operator<<(std::ostream& out, const zone_state_t& zone_state);
  43
  44 #endif