Fixed ErasureCodeShec bug

ceph-15.2.4-fix_ErasureCodeShec.patch

 diff -uNr ceph-15.2.4/src/erasure-code/shec/ErasureCodeShec.cc ceph-15.2.4-fix_ErasureCodeShec/src/erasure-code/shec/ErasureCodeShec.cc
 --- ceph-15.2.4/src/erasure-code/shec/ErasureCodeShec.cc	2020-07-01 01:10:51.000000000 +0930
-+++ ceph-15.2.4-fix_ErasureCodeShec/src/erasure-code/shec/ErasureCodeShec.cc	2020-11-14 00:46:20.029488684 +1030
-@@ -197,7 +197,10 @@
++++ ceph-15.2.4-fix_ErasureCodeShec/src/erasure-code/shec/ErasureCodeShec.cc	2020-12-27 14:09:11.480903740 +1030
+@@ -179,6 +179,10 @@
+   if (!decoded || !decoded->empty()){
+     return -EINVAL;
    }
-   unsigned int k = get_data_chunk_count();
-   unsigned int m = get_chunk_count() - k;
--  unsigned blocksize = (*chunks.begin()).second.length();
-+  unsigned blocksize = 0;
-+  if (chunks.size() > 0) {
-+    blocksize = (*chunks.begin()).second.length();
++  if (!want_to_read.empty() && chunks.empty()) {
++    // i need to get the blocksize from the first element of chunks
++    return -1;
 +  }
-   for (unsigned int i =  0; i < k + m; i++) {
-     if (chunks.find(i) == chunks.end()) {
-       bufferlist tmp;
+ 
+   have.reserve(chunks.size());
+   for (map<int, bufferlist>::const_iterator i = chunks.begin();
+diff -uNr ceph-15.2.4/src/test/erasure-code/TestErasureCodeShec_arguments.cc ceph-15.2.4-fix_ErasureCodeShec/src/test/erasure-code/TestErasureCodeShec_arguments.cc
+--- ceph-15.2.4/src/test/erasure-code/TestErasureCodeShec_arguments.cc	2020-07-01 01:10:51.000000000 +0930
++++ ceph-15.2.4-fix_ErasureCodeShec/src/test/erasure-code/TestErasureCodeShec_arguments.cc	2020-12-27 14:09:11.480903740 +1030
+@@ -323,7 +323,6 @@
+               EXPECT_EQ(-EIO, result);
+ 	      EXPECT_EQ(0u, minimum_chunks.size());
+               EXPECT_EQ(-1, dresult);
+-              EXPECT_EQ(shec->get_chunk_count(), decoded.size());
+               if (result != -EIO || dresult != -1) {
+                 ++unexpected_count;
+               }
+@@ -359,7 +358,6 @@
+                 EXPECT_EQ(-EIO, result);
+ 	        EXPECT_EQ(0u, minimum_chunks.size());
+                 EXPECT_EQ(-1, dresult);
+-                EXPECT_EQ(shec->get_chunk_count(), decoded.size());
+                 if (result != -EIO || dresult != -1) {
+                   ++unexpected_count;
+                 }