1 files changed, 44 insertions, 0 deletions
diff --git a/src/os/bluestore/zoned_types.h b/src/os/bluestore/zoned_types.h
new file mode 100644
index 000000000..6ff5d5f31
--- /dev/null
+++ b/src/os/bluestore/zoned_types.h
@@ -0,0 +1,44 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#ifndef CEPH_OS_BLUESTORE_ZONED_TYPES_H
+#define CEPH_OS_BLUESTORE_ZONED_TYPES_H
+
+#include "include/types.h"
+#include "kv/KeyValueDB.h"
+#include "os/kv.h"
+
+// Tracks two bits of information about the state of a zone: (1) number of dead
+// bytes in a zone and (2) the write pointer.  We assume that for now 32 bits is
+// enough for the zone capacity and represent these as uint32_t, and we store
+// them as a single 64-bit value in RocksDB so that we can use the existing
+// Int64ArrayMergeOperator for merge and avoid the cost of point queries.
+//
+// We use the same struct for an on-disk and in-memory representation of the
+// state.
+struct zone_state_t {
+  uint32_t num_dead_bytes = 0;
+  uint32_t write_pointer = 0;
+
+  void encode(ceph::buffer::list &bl) const;
+  void decode(ceph::buffer::list::const_iterator &p);
+
+  uint64_t get_num_dead_bytes() const {
+    return num_dead_bytes;
+  }
+
+  uint64_t get_write_pointer() const {
+    return write_pointer;
+  }
+
+  void increment_num_dead_bytes(uint64_t num_bytes) {
+    num_dead_bytes += num_bytes;
+  }
+
+  void increment_write_pointer(uint64_t num_bytes) {
+    write_pointer += num_bytes;
+  }
+};
+
+std::ostream& operator<<(std::ostream& out, const zone_state_t& zone_state);
+
+#endif