From f3d37f51b943bb1ef1ebbf2fad09a3946c3f1b67 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Sat, 16 May 2020 10:13:26 -0500
Subject: [PATCH] common/CDC: take const bufferlist

Signed-off-by: Sage Weil <sage@newdream.net>
---
 src/common/CDC.h       | 2 +-
 src/common/FastCDC.cc  | 2 +-
 src/common/FastCDC.h   | 2 +-
 src/common/FixedCDC.cc | 2 +-
 src/common/FixedCDC.h  | 2 +-
 src/common/rabin.h     | 5 +++--
 6 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/common/CDC.h b/src/common/CDC.h
index 4a90afa3a471a..e58377dffe897 100644
--- a/src/common/CDC.h
+++ b/src/common/CDC.h
@@ -13,7 +13,7 @@ public:
   virtual ~CDC() = default;
 
   virtual void calc_chunks(
-    ceph::buffer::list& inputdata,
+    const bufferlist& inputdata,
     std::vector<std::pair<uint64_t, uint64_t>> *chunks) = 0;
 
   virtual void set_target_bits(int bits, int windowbits = 2) = 0;
diff --git a/src/common/FastCDC.cc b/src/common/FastCDC.cc
index 01b240072841c..cacd084fc5c46 100644
--- a/src/common/FastCDC.cc
+++ b/src/common/FastCDC.cc
@@ -87,7 +87,7 @@ static inline bool _scan(
 }
 
 void FastCDC::calc_chunks(
-  bufferlist& bl,
+  const bufferlist& bl,
   std::vector<std::pair<uint64_t, uint64_t>> *chunks)
 {
   if (bl.length() == 0) {
diff --git a/src/common/FastCDC.h b/src/common/FastCDC.h
index 414bcc3be1f96..75b0fba954c49 100644
--- a/src/common/FastCDC.h
+++ b/src/common/FastCDC.h
@@ -41,6 +41,6 @@ public:
   }
 
   void calc_chunks(
-    bufferlist& bl,
+    const bufferlist& bl,
     std::vector<std::pair<uint64_t, uint64_t>> *chunks) override;
 };
diff --git a/src/common/FixedCDC.cc b/src/common/FixedCDC.cc
index ff1355861b465..d2d55d5cfb65e 100644
--- a/src/common/FixedCDC.cc
+++ b/src/common/FixedCDC.cc
@@ -6,7 +6,7 @@
 #include "FixedCDC.h"
 
 void FixedCDC::calc_chunks(
-  bufferlist& bl,
+  const bufferlist& bl,
   std::vector<std::pair<uint64_t, uint64_t>> *chunks)
 {
   size_t len = bl.length();
diff --git a/src/common/FixedCDC.h b/src/common/FixedCDC.h
index e5559d77825fe..d3939753e731d 100644
--- a/src/common/FixedCDC.h
+++ b/src/common/FixedCDC.h
@@ -18,6 +18,6 @@ public:
     chunk_size = 1ul << target;
   }
   void calc_chunks(
-    bufferlist& bl,
+    const bufferlist& bl,
     std::vector<std::pair<uint64_t, uint64_t>> *chunks) override;
 };
diff --git a/src/common/rabin.h b/src/common/rabin.h
index 607928a510ca5..acc5766e4ad78 100644
--- a/src/common/rabin.h
+++ b/src/common/rabin.h
@@ -50,9 +50,10 @@ public:
   }
 
   void calc_chunks(
-    ceph::buffer::list& inputdata,
+    const ceph::buffer::list& inputdata,
     std::vector<std::pair<uint64_t, uint64_t>> *chunks) override {
-    do_rabin_chunks(inputdata, *chunks);
+    bufferlist b = inputdata;
+    do_rabin_chunks(b, *chunks);
   }
 
   int do_rabin_chunks(ceph::buffer::list& inputdata,
-- 
2.39.5