4 files changed, 226 insertions, 0 deletions
diff --git a/src/compressor/zstd/CMakeLists.txt b/src/compressor/zstd/CMakeLists.txt
new file mode 100644
index 00000000..76709bbb
--- /dev/null
+++ b/src/compressor/zstd/CMakeLists.txt
@@ -0,0 +1,41 @@
+# zstd
+
+# libzstd - build it statically
+set(ZSTD_C_FLAGS "-fPIC -Wno-unused-variable -O3")
+
+include(ExternalProject)
+ExternalProject_Add(zstd_ext
+  SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/zstd/build/cmake
+  CMAKE_ARGS -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+             -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+             -DCMAKE_C_FLAGS=${ZSTD_C_FLAGS}
+             -DCMAKE_AR=${CMAKE_AR}
+             -DCMAKE_POSITION_INDEPENDENT_CODE=${ENABLE_SHARED}
+  BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/libzstd
+  BUILD_COMMAND $(MAKE) libzstd_static
+  INSTALL_COMMAND "true")
+
+# force zstd make to be called on each time
+ExternalProject_Add_Step(zstd_ext forcebuild
+  DEPENDEES configure
+  DEPENDERS build
+  COMMAND "true"
+  ALWAYS 1)
+
+add_library(zstd STATIC IMPORTED)
+set_target_properties(zstd PROPERTIES
+  INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_SOURCE_DIR}/src/zstd/lib"
+  IMPORTED_LOCATION "${CMAKE_CURRENT_BINARY_DIR}/libzstd/lib/libzstd.a")
+add_dependencies(zstd zstd_ext)
+
+set(zstd_sources
+  CompressionPluginZstd.cc
+)
+
+add_library(ceph_zstd SHARED ${zstd_sources})
+target_link_libraries(ceph_zstd PRIVATE zstd)
+set_target_properties(ceph_zstd PROPERTIES
+  VERSION 2.0.0
+  SOVERSION 2
+  INSTALL_RPATH "")
+install(TARGETS ceph_zstd DESTINATION ${compressor_plugin_dir})
diff --git a/src/compressor/zstd/CompressionPluginZstd.cc b/src/compressor/zstd/CompressionPluginZstd.cc
new file mode 100644
index 00000000..62c2cfbf
--- /dev/null
+++ b/src/compressor/zstd/CompressionPluginZstd.cc
@@ -0,0 +1,36 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 Mirantis, Inc.
+ *
+ * Author: Alyona Kiseleva <akiselyova@mirantis.com>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#include "acconfig.h"
+#include "ceph_ver.h"
+#include "common/ceph_context.h"
+#include "CompressionPluginZstd.h"
+
+// -----------------------------------------------------------------------------
+
+const char *__ceph_plugin_version()
+{
+  return CEPH_GIT_NICE_VER;
+}
+
+// -----------------------------------------------------------------------------
+
+int __ceph_plugin_init(CephContext *cct,
+                       const std::string& type,
+                       const std::string& name)
+{
+  PluginRegistry *instance = cct->get_plugin_registry();
+
+  return instance->add(type, name, new CompressionPluginZstd(cct));
+}
diff --git a/src/compressor/zstd/CompressionPluginZstd.h b/src/compressor/zstd/CompressionPluginZstd.h
new file mode 100644
index 00000000..72ef9c45
--- /dev/null
+++ b/src/compressor/zstd/CompressionPluginZstd.h
@@ -0,0 +1,43 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 Mirantis, Inc.
+ *
+ * Author: Alyona Kiseleva <akiselyova@mirantis.com>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef CEPH_COMPRESSION_PLUGIN_ZSTD_H
+#define CEPH_COMPRESSION_PLUGIN_ZSTD_H
+
+// -----------------------------------------------------------------------------
+#include "ceph_ver.h"
+#include "compressor/CompressionPlugin.h"
+#include "ZstdCompressor.h"
+// -----------------------------------------------------------------------------
+
+class CompressionPluginZstd : public CompressionPlugin {
+
+public:
+
+  explicit CompressionPluginZstd(CephContext* cct) : CompressionPlugin(cct)
+  {}
+
+  int factory(CompressorRef *cs,
+                      std::ostream *ss) override
+  {
+    if (compressor == 0) {
+      ZstdCompressor *interface = new ZstdCompressor(cct);
+      compressor = CompressorRef(interface);
+    }
+    *cs = compressor;
+    return 0;
+  }
+};
+
+#endif
diff --git a/src/compressor/zstd/ZstdCompressor.h b/src/compressor/zstd/ZstdCompressor.h
new file mode 100644
index 00000000..83508b93
--- /dev/null
+++ b/src/compressor/zstd/ZstdCompressor.h
@@ -0,0 +1,106 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 Haomai Wang <haomaiwang@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_ZSTDCOMPRESSOR_H
+#define CEPH_ZSTDCOMPRESSOR_H
+
+#define ZSTD_STATIC_LINKING_ONLY
+#include "zstd/lib/zstd.h"
+
+#include "include/buffer.h"
+#include "include/encoding.h"
+#include "compressor/Compressor.h"
+
+class ZstdCompressor : public Compressor {
+ public:
+  ZstdCompressor(CephContext *cct) : Compressor(COMP_ALG_ZSTD, "zstd"), cct(cct) {}
+
+  int compress(const bufferlist &src, bufferlist &dst) override {
+    ZSTD_CStream *s = ZSTD_createCStream();
+    ZSTD_initCStream_srcSize(s, cct->_conf->compressor_zstd_level, src.length());
+    auto p = src.begin();
+    size_t left = src.length();
+
+    size_t const out_max = ZSTD_compressBound(left);
+    bufferptr outptr = buffer::create_small_page_aligned(out_max);
+    ZSTD_outBuffer_s outbuf;
+    outbuf.dst = outptr.c_str();
+    outbuf.size = outptr.length();
+    outbuf.pos = 0;
+
+    while (left) {
+      ceph_assert(!p.end());
+      struct ZSTD_inBuffer_s inbuf;
+      inbuf.pos = 0;
+      inbuf.size = p.get_ptr_and_advance(left, (const char**)&inbuf.src);
+      left -= inbuf.size;
+      ZSTD_EndDirective const zed = (left==0) ? ZSTD_e_end : ZSTD_e_continue;
+      size_t r = ZSTD_compress_generic(s, &outbuf, &inbuf, zed);
+      if (ZSTD_isError(r)) {
+	return -EINVAL;
+      }
+    }
+    ceph_assert(p.end());
+
+    ZSTD_freeCStream(s);
+
+    // prefix with decompressed length
+    encode((uint32_t)src.length(), dst);
+    dst.append(outptr, 0, outbuf.pos);
+    return 0;
+  }
+
+  int decompress(const bufferlist &src, bufferlist &dst) override {
+    auto i = std::cbegin(src);
+    return decompress(i, src.length(), dst);
+  }
+
+  int decompress(bufferlist::const_iterator &p,
+		 size_t compressed_len,
+		 bufferlist &dst) override {
+    if (compressed_len < 4) {
+      return -1;
+    }
+    compressed_len -= 4;
+    uint32_t dst_len;
+    decode(dst_len, p);
+
+    bufferptr dstptr(dst_len);
+    ZSTD_outBuffer_s outbuf;
+    outbuf.dst = dstptr.c_str();
+    outbuf.size = dstptr.length();
+    outbuf.pos = 0;
+    ZSTD_DStream *s = ZSTD_createDStream();
+    ZSTD_initDStream(s);
+    while (compressed_len > 0) {
+      if (p.end()) {
+	return -1;
+      }
+      ZSTD_inBuffer_s inbuf;
+      inbuf.pos = 0;
+      inbuf.size = p.get_ptr_and_advance(compressed_len,
+					 (const char**)&inbuf.src);
+      ZSTD_decompressStream(s, &outbuf, &inbuf);
+      compressed_len -= inbuf.size;
+    }
+    ZSTD_freeDStream(s);
+
+    dst.append(dstptr, 0, outbuf.pos);
+    return 0;
+  }
+ private:
+  CephContext *const cct;
+};
+
+#endif