From a9173eff11567401ff4fcf5e083fc248c47fc44f Mon Sep 17 00:00:00 2001
From: Samuel Just <sjust@redhat.com>
Date: Mon, 13 Jul 2020 15:41:00 -0700
Subject: [PATCH] crimson/os/seastore: add const cast() method

Signed-off-by: Samuel Just <sjust@redhat.com>
---
 src/crimson/os/seastore/cached_extent.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/crimson/os/seastore/cached_extent.h b/src/crimson/os/seastore/cached_extent.h
index 6e4bd650a758c..7ab52f0fa6339 100644
--- a/src/crimson/os/seastore/cached_extent.h
+++ b/src/crimson/os/seastore/cached_extent.h
@@ -171,6 +171,10 @@ public:
   TCachedExtentRef<T> cast() {
     return TCachedExtentRef<T>(static_cast<T*>(this));
   }
+  template <typename T>
+  TCachedExtentRef<const T> cast() const {
+    return TCachedExtentRef<const T>(static_cast<const T*>(this));
+  }
 
   /// Returns true if extent is part of an open transaction
   bool is_pending() const {
-- 
2.39.5