From b1f11939d617f3f9abef89d2a5cd7129ca3bf61a Mon Sep 17 00:00:00 2001
From: lixiaoy1 <xiaoyan.li@intel.com>
Date: Thu, 22 Oct 2020 10:44:43 -0400
Subject: [PATCH] librbd/deep_copy: skip reading data from image cache

Signed-off-by: Li, Xiaoyan <xiaoyan.li@intel.com>
---
 src/librbd/cache/WriteLogImageDispatch.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/librbd/cache/WriteLogImageDispatch.cc b/src/librbd/cache/WriteLogImageDispatch.cc
index bf1831cbacfbd..3fa04aac6fd06 100644
--- a/src/librbd/cache/WriteLogImageDispatch.cc
+++ b/src/librbd/cache/WriteLogImageDispatch.cc
@@ -2,6 +2,7 @@
 // vim: ts=8 sw=2 smarttab
 
 #include "common/dout.h"
+#include "include/neorados/RADOS.hpp"
 #include "librbd/cache/pwl/AbstractWriteLog.h"
 #include "librbd/cache/pwl/ShutdownRequest.h"
 #include "librbd/cache/WriteLogImageDispatch.h"
@@ -54,6 +55,10 @@ bool WriteLogImageDispatch<I>::read(
   auto cct = m_image_ctx->cct;
   ldout(cct, 20) << "image_extents=" << image_extents << dendl;
 
+  if (io_context->read_snap().value_or(CEPH_NOSNAP) != CEPH_NOSNAP) {
+    return false;
+  }
+
   *dispatch_result = io::DISPATCH_RESULT_COMPLETE;
   if (preprocess_length(aio_comp, image_extents)) {
     return true;
-- 
2.39.5