1 // Copyright (c) 2009-2010 Satoshi Nakamoto 2 // Copyright (c) 2009-2019 The Bitcoin Core developers 3 // Distributed under the MIT software license, see the accompanying 4 // file COPYING or http://www.opensource.org/licenses/mit-license.php. 5 6 #include <stdexcept> 7 8 #include <flatfile.h> 9 #include <logging.h> 10 #include <tinyformat.h> 11 #include <util/system.h> 12 13 FlatFileSeq::FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size) : 14 m_dir(std::move(dir)), 15 m_prefix(prefix), 16 m_chunk_size(chunk_size) 17 { 18 if (chunk_size == 0) { 19 throw std::invalid_argument("chunk_size must be positive"); 20 } 21 } 22 23 std::string FlatFilePos::ToString() const 24 { 25 return strprintf("FlatFilePos(nFile=%i, nPos=%i)", nFile, nPos); 26 } 27 28 fs::path FlatFileSeq::FileName(const FlatFilePos& pos) const 29 { 30 return m_dir / strprintf("%s%05u.dat", m_prefix, pos.nFile); 31 } 32 33 FILE* FlatFileSeq::Open(const FlatFilePos& pos, bool read_only) 34 { 35 if (pos.IsNull()) { 36 return nullptr; 37 } 38 fs::path path = FileName(pos); 39 fs::create_directories(path.parent_path()); 40 FILE* file = fsbridge::fopen(path, read_only ? "rb": "rb+"); 41 if (!file && !read_only) 42 file = fsbridge::fopen(path, "wb+"); 43 if (!file) { 44 LogPrintf("Unable to open file %s\n", path.string()); 45 return nullptr; 46 } 47 if (pos.nPos && fseek(file, pos.nPos, SEEK_SET)) { 48 LogPrintf("Unable to seek to position %u of %s\n", pos.nPos, path.string()); 49 fclose(file); 50 return nullptr; 51 } 52 return file; 53 } 54 55 size_t FlatFileSeq::Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space) 56 { 57 out_of_space = false; 58 59 unsigned int n_old_chunks = (pos.nPos + m_chunk_size - 1) / m_chunk_size; 60 unsigned int n_new_chunks = (pos.nPos + add_size + m_chunk_size - 1) / m_chunk_size; 61 if (n_new_chunks > n_old_chunks) { 62 size_t old_size = pos.nPos; 63 size_t new_size = n_new_chunks * m_chunk_size; 64 size_t inc_size = new_size - old_size; 65 66 if (CheckDiskSpace(m_dir, inc_size)) { 67 FILE *file = Open(pos); 68 if (file) { 69 LogPrint(BCLog::VALIDATION, "Pre-allocating up to position 0x%x in %s%05u.dat\n", new_size, m_prefix, pos.nFile); 70 AllocateFileRange(file, pos.nPos, inc_size); 71 fclose(file); 72 return inc_size; 73 } 74 } else { 75 out_of_space = true; 76 } 77 } 78 return 0; 79 } 80 81 bool FlatFileSeq::Flush(const FlatFilePos& pos, bool finalize) 82 { 83 FILE* file = Open(FlatFilePos(pos.nFile, 0)); // Avoid fseek to nPos 84 if (!file) { 85 return error("%s: failed to open file %d", __func__, pos.nFile); 86 } 87 if (finalize && !TruncateFile(file, pos.nPos)) { 88 fclose(file); 89 return error("%s: failed to truncate file %d", __func__, pos.nFile); 90 } 91 if (!FileCommit(file)) { 92 fclose(file); 93 return error("%s: failed to commit file %d", __func__, pos.nFile); 94 } 95 DirectoryCommit(m_dir); 96 97 fclose(file); 98 return true; 99 } 100