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diff --git a/src/ceph/src/tools/cephfs/RoleSelector.h b/src/ceph/src/tools/cephfs/RoleSelector.h
new file mode 100644
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+++ b/src/ceph/src/tools/cephfs/RoleSelector.h
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+
+#ifndef ROLE_SELECTOR_H_
+#define ROLE_SELECTOR_H_
+
+#include <string>
+#include <vector>
+#include "mds/mdstypes.h"
+#include "mds/FSMap.h"
+
+/**
+ * When you want to let the user act on a single rank in a namespace,
+ * or all of them.
+ */
+class MDSRoleSelector
+{
+  public:
+    const std::vector<mds_role_t> &get_roles() const {return roles;}
+    int parse(const FSMap &fsmap, std::string const &str);
+    MDSRoleSelector()
+      : fscid(FS_CLUSTER_ID_NONE)
+    {}
+    fs_cluster_id_t get_ns() const
+    {
+      return fscid;
+    }
+  protected:
+    int parse_rank(
+        const FSMap &fsmap,
+        std::string const &str);
+    std::vector<mds_role_t> roles;
+    fs_cluster_id_t fscid;
+};
+
+#endif // ROLE_SELECTOR_H_
+