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rocksdb/table/block_based/reader_common.cc

71 lines
2.6 KiB

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "table/block_based/reader_common.h"
#include "monitoring/perf_context_imp.h"
#include "table/format.h"
#include "util/coding.h"
#include "util/crc32c.h"
#include "util/hash.h"
#include "util/string_util.h"
#include "util/xxhash.h"
namespace ROCKSDB_NAMESPACE {
void ForceReleaseCachedEntry(void* arg, void* h) {
Cache* cache = reinterpret_cast<Cache*>(arg);
Cache::Handle* handle = reinterpret_cast<Cache::Handle*>(h);
cache->Release(handle, true /* force_erase */);
}
Status VerifyBlockChecksum(ChecksumType type, const char* data,
size_t block_size, const std::string& file_name,
uint64_t offset) {
PERF_TIMER_GUARD(block_checksum_time);
// After block_size bytes is compression type (1 byte), which is part of
// the checksummed section.
size_t len = block_size + 1;
// And then the stored checksum value (4 bytes).
uint32_t stored = DecodeFixed32(data + len);
Status s;
uint32_t computed = 0;
switch (type) {
case kNoChecksum:
break;
case kCRC32c:
stored = crc32c::Unmask(stored);
computed = crc32c::Value(data, len);
break;
case kxxHash:
computed = XXH32(data, len, 0);
break;
case kxxHash64:
computed = Lower32of64(XXH64(data, len, 0));
break;
case kXXH3:
computed = Lower32of64(XXH3_64bits(data, block_size));
// Treat compression type separately for speed in building table files
computed = ModifyChecksumForCompressionType(computed, data[block_size]);
break;
default:
s = Status::Corruption(
"unknown checksum type " + ToString(type) + " from footer of " +
file_name + ", while checking block at offset " + ToString(offset) +
" size " + ToString(block_size));
}
if (s.ok() && stored != computed) {
s = Status::Corruption(
"block checksum mismatch: stored = " + ToString(stored) +
", computed = " + ToString(computed) + ", type = " + ToString(type) +
" in " + file_name + " offset " + ToString(offset) + " size " +
ToString(block_size));
}
return s;
}
} // namespace ROCKSDB_NAMESPACE