Line data    Source code

       1             : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2             : // Copyright (c) 2009-2022 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/fs_helpers.h>
      12             : 
      13         803 : FlatFileSeq::FlatFileSeq(fs::path dir, const char* prefix, size_t chunk_size) :
      14         803 :     m_dir(std::move(dir)),
      15         803 :     m_prefix(prefix),
      16         803 :     m_chunk_size(chunk_size)
      17             : {
      18         803 :     if (chunk_size == 0) {
      19           0 :         throw std::invalid_argument("chunk_size must be positive");
      20             :     }
      21         803 : }
      22             : 
      23           0 : std::string FlatFilePos::ToString() const
      24             : {
      25           0 :     return strprintf("FlatFilePos(nFile=%i, nPos=%i)", nFile, nPos);
      26             : }
      27             : 
      28         404 : fs::path FlatFileSeq::FileName(const FlatFilePos& pos) const
      29             : {
      30         404 :     return m_dir / fs::u8path(strprintf("%s%05u.dat", m_prefix, pos.nFile));
      31           0 : }
      32             : 
      33         404 : FILE* FlatFileSeq::Open(const FlatFilePos& pos, bool read_only)
      34             : {
      35         404 :     if (pos.IsNull()) {
      36           0 :         return nullptr;
      37             :     }
      38         404 :     fs::path path = FileName(pos);
      39         404 :     fs::create_directories(path.parent_path());
      40         404 :     FILE* file = fsbridge::fopen(path, read_only ? "rb": "rb+");
      41         404 :     if (!file && !read_only)
      42           2 :         file = fsbridge::fopen(path, "wb+");
      43         404 :     if (!file) {
      44           0 :         LogPrintf("Unable to open file %s\n", fs::PathToString(path));
      45           0 :         return nullptr;
      46             :     }
      47         404 :     if (pos.nPos && fseek(file, pos.nPos, SEEK_SET)) {
      48           0 :         LogPrintf("Unable to seek to position %u of %s\n", pos.nPos, fs::PathToString(path));
      49           0 :         fclose(file);
      50           0 :         return nullptr;
      51             :     }
      52         404 :     return file;
      53         404 : }
      54             : 
      55         401 : size_t FlatFileSeq::Allocate(const FlatFilePos& pos, size_t add_size, bool& out_of_space)
      56             : {
      57         401 :     out_of_space = false;
      58             : 
      59         401 :     unsigned int n_old_chunks = (pos.nPos + m_chunk_size - 1) / m_chunk_size;
      60         401 :     unsigned int n_new_chunks = (pos.nPos + add_size + m_chunk_size - 1) / m_chunk_size;
      61         401 :     if (n_new_chunks > n_old_chunks) {
      62           2 :         size_t old_size = pos.nPos;
      63           2 :         size_t new_size = n_new_chunks * m_chunk_size;
      64           2 :         size_t inc_size = new_size - old_size;
      65             : 
      66           2 :         if (CheckDiskSpace(m_dir, inc_size)) {
      67           2 :             FILE *file = Open(pos);
      68           2 :             if (file) {
      69           2 :                 LogPrint(BCLog::VALIDATION, "Pre-allocating up to position 0x%x in %s%05u.dat\n", new_size, m_prefix, pos.nFile);
      70           2 :                 AllocateFileRange(file, pos.nPos, inc_size);
      71           2 :                 fclose(file);
      72           2 :                 return inc_size;
      73             :             }
      74           2 :         } else {
      75           0 :             out_of_space = true;
      76             :         }
      77           0 :     }
      78         399 :     return 0;
      79         401 : }
      80             : 
      81           0 : bool FlatFileSeq::Flush(const FlatFilePos& pos, bool finalize)
      82             : {
      83           0 :     FILE* file = Open(FlatFilePos(pos.nFile, 0)); // Avoid fseek to nPos
      84           0 :     if (!file) {
      85           0 :         return error("%s: failed to open file %d", __func__, pos.nFile);
      86             :     }
      87           0 :     if (finalize && !TruncateFile(file, pos.nPos)) {
      88           0 :         fclose(file);
      89           0 :         return error("%s: failed to truncate file %d", __func__, pos.nFile);
      90             :     }
      91           0 :     if (!FileCommit(file)) {
      92           0 :         fclose(file);
      93           0 :         return error("%s: failed to commit file %d", __func__, pos.nFile);
      94             :     }
      95           0 :     DirectoryCommit(m_dir);
      96             : 
      97           0 :     fclose(file);
      98           0 :     return true;
      99           0 : }