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[stor4nfv.git] / src / ceph / src / librbd / Types.h

diff --git a/src/ceph/src/librbd/Types.h b/src/ceph/src/librbd/Types.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef LIBRBD_TYPES_H
+#define LIBRBD_TYPES_H
+
+#include "include/types.h"
+#include "cls/rbd/cls_rbd_types.h"
+#include <string>
+
+namespace librbd {
+
+/** @brief Unique identification of a parent in clone relationship.
+ * Cloning an image creates a child image that keeps a reference
+ * to its parent. This allows copy-on-write images. */
+struct ParentSpec {
+  int64_t pool_id;
+  std::string image_id;
+  snapid_t snap_id;
+
+  ParentSpec() : pool_id(-1), snap_id(CEPH_NOSNAP) {
+  }
+  ParentSpec(int64_t pool_id, std::string image_id, snapid_t snap_id)
+    : pool_id(pool_id), image_id(image_id), snap_id(snap_id) {
+  }
+
+  bool operator==(const ParentSpec &other) {
+    return ((this->pool_id == other.pool_id) &&
+            (this->image_id == other.image_id) &&
+            (this->snap_id == other.snap_id));
+  }
+  bool operator!=(const ParentSpec &other) {
+    return !(*this == other);
+  }
+};
+
+/// Full information about an image's parent.
+struct ParentInfo {
+  /// Identification of the parent.
+  ParentSpec spec;
+
+  /** @brief Where the portion of data shared with the child image ends.
+   * Since images can be resized multiple times, the portion of data shared
+   * with the child image is not necessarily min(parent size, child size).
+   * If the child image is first shrunk and then enlarged, the common portion
+   * will be shorter. */
+  uint64_t overlap;
+
+  ParentInfo() : overlap(0) {
+  }
+};
+
+struct SnapInfo {
+  std::string name;
+  cls::rbd::SnapshotNamespace snap_namespace;
+  uint64_t size;
+  ParentInfo parent;
+  uint8_t protection_status;
+  uint64_t flags;
+  utime_t timestamp;
+  SnapInfo(std::string _name,
+           const cls::rbd::SnapshotNamespace &_snap_namespace,
+           uint64_t _size, const ParentInfo &_parent,
+           uint8_t _protection_status, uint64_t _flags, utime_t _timestamp)
+    : name(_name), snap_namespace(_snap_namespace), size(_size),
+      parent(_parent), protection_status(_protection_status), flags(_flags),
+      timestamp(_timestamp) {
+  }
+};
+
+} // namespace librbd
+
+#endif // LIBRBD_TYPES_H