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-rw-r--r--src/compressor/lz4/CMakeLists.txt13
-rw-r--r--src/compressor/lz4/CompressionPluginLZ4.cc36
-rw-r--r--src/compressor/lz4/CompressionPluginLZ4.h41
-rw-r--r--src/compressor/lz4/LZ4Compressor.h144
4 files changed, 234 insertions, 0 deletions
diff --git a/src/compressor/lz4/CMakeLists.txt b/src/compressor/lz4/CMakeLists.txt
new file mode 100644
index 00000000..7a8a15d6
--- /dev/null
+++ b/src/compressor/lz4/CMakeLists.txt
@@ -0,0 +1,13 @@
+# lz4
+
+set(lz4_sources
+ CompressionPluginLZ4.cc
+)
+
+add_library(ceph_lz4 SHARED ${lz4_sources})
+target_link_libraries(ceph_lz4 PRIVATE LZ4::LZ4)
+set_target_properties(ceph_lz4 PROPERTIES
+ VERSION 2.0.0
+ SOVERSION 2
+ INSTALL_RPATH "")
+install(TARGETS ceph_lz4 DESTINATION ${compressor_plugin_dir})
diff --git a/src/compressor/lz4/CompressionPluginLZ4.cc b/src/compressor/lz4/CompressionPluginLZ4.cc
new file mode 100644
index 00000000..ef3f2406
--- /dev/null
+++ b/src/compressor/lz4/CompressionPluginLZ4.cc
@@ -0,0 +1,36 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 XSKY Inc.
+ *
+ * Author: Haomai Wang <haomaiwang@gmail.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 "CompressionPluginLZ4.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 CompressionPluginLZ4(cct));
+}
diff --git a/src/compressor/lz4/CompressionPluginLZ4.h b/src/compressor/lz4/CompressionPluginLZ4.h
new file mode 100644
index 00000000..7e8cdf67
--- /dev/null
+++ b/src/compressor/lz4/CompressionPluginLZ4.h
@@ -0,0 +1,41 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 XSKY Inc.
+ *
+ * Author: Haomai Wang <haomaiwang@gmail.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_LZ4_H
+#define CEPH_COMPRESSION_PLUGIN_LZ4_H
+
+// -----------------------------------------------------------------------------
+#include "ceph_ver.h"
+#include "compressor/CompressionPlugin.h"
+#include "LZ4Compressor.h"
+// -----------------------------------------------------------------------------
+
+class CompressionPluginLZ4 : public CompressionPlugin {
+
+public:
+
+ explicit CompressionPluginLZ4(CephContext* cct) : CompressionPlugin(cct)
+ {}
+
+ int factory(CompressorRef *cs, std::ostream *ss) override {
+ if (compressor == 0) {
+ LZ4Compressor *interface = new LZ4Compressor(cct);
+ compressor = CompressorRef(interface);
+ }
+ *cs = compressor;
+ return 0;
+ }
+};
+
+#endif
diff --git a/src/compressor/lz4/LZ4Compressor.h b/src/compressor/lz4/LZ4Compressor.h
new file mode 100644
index 00000000..6e604d5c
--- /dev/null
+++ b/src/compressor/lz4/LZ4Compressor.h
@@ -0,0 +1,144 @@
+// -*- 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) 2017 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_LZ4COMPRESSOR_H
+#define CEPH_LZ4COMPRESSOR_H
+
+#include <lz4.h>
+
+#include "compressor/Compressor.h"
+#include "include/buffer.h"
+#include "include/encoding.h"
+#include "common/config.h"
+#include "common/Tub.h"
+
+
+class LZ4Compressor : public Compressor {
+ public:
+ LZ4Compressor(CephContext* cct) : Compressor(COMP_ALG_LZ4, "lz4") {
+#ifdef HAVE_QATZIP
+ if (cct->_conf->qat_compressor_enabled && qat_accel.init("lz4"))
+ qat_enabled = true;
+ else
+ qat_enabled = false;
+#endif
+ }
+
+ int compress(const bufferlist &src, bufferlist &dst) override {
+ // older versions of liblz4 introduce bit errors when compressing
+ // fragmented buffers. this was fixed in lz4 commit
+ // af127334670a5e7b710bbd6adb71aa7c3ef0cd72, which first
+ // appeared in v1.8.2.
+ //
+ // workaround: rebuild if not contiguous.
+ if (!src.is_contiguous()) {
+ bufferlist new_src = src;
+ new_src.rebuild();
+ return compress(new_src, dst);
+ }
+
+#ifdef HAVE_QATZIP
+ if (qat_enabled)
+ return qat_accel.compress(src, dst);
+#endif
+ bufferptr outptr = buffer::create_small_page_aligned(
+ LZ4_compressBound(src.length()));
+ LZ4_stream_t lz4_stream;
+ LZ4_resetStream(&lz4_stream);
+
+ auto p = src.begin();
+ size_t left = src.length();
+ int pos = 0;
+ const char *data;
+ unsigned num = src.get_num_buffers();
+ encode((uint32_t)num, dst);
+ while (left) {
+ uint32_t origin_len = p.get_ptr_and_advance(left, &data);
+ int compressed_len = LZ4_compress_fast_continue(
+ &lz4_stream, data, outptr.c_str()+pos, origin_len,
+ outptr.length()-pos, 1);
+ if (compressed_len <= 0)
+ return -1;
+ pos += compressed_len;
+ left -= origin_len;
+ encode(origin_len, dst);
+ encode((uint32_t)compressed_len, dst);
+ }
+ ceph_assert(p.end());
+
+ dst.append(outptr, 0, pos);
+ return 0;
+ }
+
+ int decompress(const bufferlist &src, bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+ if (qat_enabled)
+ return qat_accel.decompress(src, dst);
+#endif
+ auto i = std::cbegin(src);
+ return decompress(i, src.length(), dst);
+ }
+
+ int decompress(bufferlist::const_iterator &p,
+ size_t compressed_len,
+ bufferlist &dst) override {
+#ifdef HAVE_QATZIP
+ if (qat_enabled)
+ return qat_accel.decompress(p, compressed_len, dst);
+#endif
+ uint32_t count;
+ std::vector<std::pair<uint32_t, uint32_t> > compressed_pairs;
+ decode(count, p);
+ compressed_pairs.resize(count);
+ uint32_t total_origin = 0;
+ for (unsigned i = 0; i < count; ++i) {
+ decode(compressed_pairs[i].first, p);
+ decode(compressed_pairs[i].second, p);
+ total_origin += compressed_pairs[i].first;
+ }
+ compressed_len -= (sizeof(uint32_t) + sizeof(uint32_t) * count * 2);
+
+ bufferptr dstptr(total_origin);
+ LZ4_streamDecode_t lz4_stream_decode;
+ LZ4_setStreamDecode(&lz4_stream_decode, nullptr, 0);
+
+ bufferptr cur_ptr = p.get_current_ptr();
+ bufferptr *ptr = &cur_ptr;
+ Tub<bufferptr> data_holder;
+ if (compressed_len != cur_ptr.length()) {
+ data_holder.construct(compressed_len);
+ p.copy_deep(compressed_len, *data_holder);
+ ptr = data_holder.get();
+ }
+
+ char *c_in = ptr->c_str();
+ char *c_out = dstptr.c_str();
+ for (unsigned i = 0; i < count; ++i) {
+ int r = LZ4_decompress_safe_continue(
+ &lz4_stream_decode, c_in, c_out, compressed_pairs[i].second, compressed_pairs[i].first);
+ if (r == (int)compressed_pairs[i].first) {
+ c_in += compressed_pairs[i].second;
+ c_out += compressed_pairs[i].first;
+ } else if (r < 0) {
+ return -1;
+ } else {
+ return -2;
+ }
+ }
+ dst.push_back(std::move(dstptr));
+ return 0;
+ }
+};
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 11:40:27 +0000