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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/compressor/lz4/LZ4Compressor.h | |
parent | Initial commit. (diff) | |
download | ceph-upstream/16.2.11+ds.tar.xz ceph-upstream/16.2.11+ds.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/compressor/lz4/LZ4Compressor.h')
-rw-r--r-- | src/compressor/lz4/LZ4Compressor.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/compressor/lz4/LZ4Compressor.h b/src/compressor/lz4/LZ4Compressor.h new file mode 100644 index 000000000..b97d91f2b --- /dev/null +++ b/src/compressor/lz4/LZ4Compressor.h @@ -0,0 +1,148 @@ +// -*- 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 ceph::buffer::list &src, ceph::buffer::list &dst, boost::optional<int32_t> &compressor_message) 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()) { + ceph::buffer::list new_src = src; + new_src.rebuild(); + return compress(new_src, dst, compressor_message); + } + +#ifdef HAVE_QATZIP + if (qat_enabled) + return qat_accel.compress(src, dst, compressor_message); +#endif + ceph::buffer::ptr outptr = ceph::buffer::create_small_page_aligned( + LZ4_compressBound(src.length())); + LZ4_stream_t lz4_stream; + LZ4_resetStream(&lz4_stream); + + using ceph::encode; + + 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 ceph::buffer::list &src, ceph::buffer::list &dst, boost::optional<int32_t> compressor_message) override { +#ifdef HAVE_QATZIP + if (qat_enabled) + return qat_accel.decompress(src, dst, compressor_message); +#endif + auto i = std::cbegin(src); + return decompress(i, src.length(), dst, compressor_message); + } + + int decompress(ceph::buffer::list::const_iterator &p, + size_t compressed_len, + ceph::buffer::list &dst, + boost::optional<int32_t> compressor_message) override { +#ifdef HAVE_QATZIP + if (qat_enabled) + return qat_accel.decompress(p, compressed_len, dst, compressor_message); +#endif + using ceph::decode; + 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); + + ceph::buffer::ptr dstptr(total_origin); + LZ4_streamDecode_t lz4_stream_decode; + LZ4_setStreamDecode(&lz4_stream_decode, nullptr, 0); + + ceph::buffer::ptr cur_ptr = p.get_current_ptr(); + ceph::buffer::ptr *ptr = &cur_ptr; + Tub<ceph::buffer::ptr> 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 |