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Copy pathflatfile.cpp
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116 lines (104 loc) · 3.61 KB
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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <flatfile.h>
#include <tinyformat.h>
#include <util/fs_helpers.h>
#include <util/log.h>
#include <util/overflow.h>
#include <stdexcept>
FlatFileSeq::FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size) :
m_dir(std::move(dir)),
m_prefix(prefix),
m_chunk_size(chunk_size)
{
if (chunk_size == 0) {
throw std::invalid_argument("chunk_size must be positive");
}
}
std::string FlatFilePos::ToString() const
{
return strprintf("FlatFilePos(nFile=%i, nPos=%i)", nFile, nPos);
}
fs::path FlatFileSeq::FileName(const FlatFilePos& pos) const
{
return m_dir / fs::u8path(strprintf("%s%05u.dat", m_prefix, pos.nFile));
}
FILE* FlatFileSeq::Open(const FlatFilePos& pos, bool read_only) const
{
if (pos.IsNull()) {
return nullptr;
}
fs::path path = FileName(pos);
fs::create_directories(path.parent_path());
FILE* file = fsbridge::fopen(path, read_only ? "rb": "rb+");
if (!file && !read_only)
file = fsbridge::fopen(path, "wb+");
if (!file) {
LogError("Unable to open file %s", fs::PathToString(path));
return nullptr;
}
if (pos.nPos && fseek(file, pos.nPos, SEEK_SET)) {
LogError("Unable to seek to position %u of %s", pos.nPos, fs::PathToString(path));
if (fclose(file) != 0) {
LogError("Unable to close file %s", fs::PathToString(path));
}
return nullptr;
}
return file;
}
size_t FlatFileSeq::Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space) const
{
out_of_space = false;
unsigned int n_old_chunks = CeilDiv(pos.nPos, m_chunk_size);
unsigned int n_new_chunks = CeilDiv(pos.nPos + add_size, m_chunk_size);
if (n_new_chunks > n_old_chunks) {
size_t old_size = pos.nPos;
size_t new_size = n_new_chunks * m_chunk_size;
size_t inc_size = new_size - old_size;
if (CheckDiskSpace(m_dir, inc_size)) {
FILE *file = Open(pos);
if (file) {
LogDebug(BCLog::VALIDATION, "Pre-allocating up to position 0x%x in %s%05u.dat\n", new_size, m_prefix, pos.nFile);
AllocateFileRange(file, pos.nPos, inc_size);
if (fclose(file) != 0) {
LogError("Cannot close file %s%05u.dat after extending it with %u bytes", m_prefix, pos.nFile, new_size);
return 0;
}
return inc_size;
}
} else {
out_of_space = true;
}
}
return 0;
}
bool FlatFileSeq::Flush(const FlatFilePos& pos, bool finalize) const
{
FILE* file = Open(FlatFilePos(pos.nFile, 0)); // Avoid fseek to nPos
if (!file) {
LogError("%s: failed to open file %d\n", __func__, pos.nFile);
return false;
}
if (finalize && !TruncateFile(file, pos.nPos)) {
LogError("%s: failed to truncate file %d\n", __func__, pos.nFile);
if (fclose(file) != 0) {
LogError("Failed to close file %d", pos.nFile);
}
return false;
}
if (!FileCommit(file)) {
LogError("%s: failed to commit file %d\n", __func__, pos.nFile);
if (fclose(file) != 0) {
LogError("Failed to close file %d", pos.nFile);
}
return false;
}
DirectoryCommit(m_dir);
if (fclose(file) != 0) {
LogError("Failed to close file %d after flush", pos.nFile);
return false;
}
return true;
}