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Pre-allocate block and undo files in chunks

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Introduce a AllocateFileRange() function in util, which wipes or
at least allocates a given range of a file. It can be overriden
by more efficient OS-dependent versions if necessary.

Block and undo files are now allocated in chunks of 16 and 1 MiB,
respectively.
This commit is contained in:
Pieter Wuille
2012-08-16 02:21:28 +02:00
parent 5382bcf8cd
commit bba89aa82a
4 changed files with 49 additions and 9 deletions
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41
src/main.cpp
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@@ -1844,6 +1844,17 @@ bool FindBlockPos(CTxDB &txdb, CDiskBlockPos &pos, unsigned int nAddSize, unsign
infoLastBlockFile.nSize += nAddSize;
infoLastBlockFile.AddBlock(nHeight, nTime);
unsigned int nOldChunks = (pos.nPos + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
unsigned int nNewChunks = (infoLastBlockFile.nSize + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
if (nNewChunks > nOldChunks) {
FILE *file = OpenBlockFile(pos);
if (file) {
printf("Pre-allocating up to position 0x%x in blk%05u.dat\n", nNewChunks * BLOCKFILE_CHUNK_SIZE, pos.nFile);
AllocateFileRange(file, pos.nPos, nNewChunks * BLOCKFILE_CHUNK_SIZE - pos.nPos);
}
fclose(file);
}
if (!txdb.WriteBlockFileInfo(nLastBlockFile, infoLastBlockFile))
return error("FindBlockPos() : cannot write updated block info");
if (fUpdatedLast)
@@ -1858,21 +1869,33 @@ bool FindUndoPos(CTxDB &txdb, int nFile, CDiskBlockPos &pos, unsigned int nAddSi
LOCK(cs_LastBlockFile);
unsigned int nNewSize;
if (nFile == nLastBlockFile) {
pos.nPos = infoLastBlockFile.nUndoSize;
infoLastBlockFile.nUndoSize += nAddSize;
nNewSize = (infoLastBlockFile.nUndoSize += nAddSize);
if (!txdb.WriteBlockFileInfo(nLastBlockFile, infoLastBlockFile))
return error("FindUndoPos() : cannot write updated block info");
return true;
} else {
CBlockFileInfo info;
if (!txdb.ReadBlockFileInfo(nFile, info))
return error("FindUndoPos() : cannot read block info");
pos.nPos = info.nUndoSize;
nNewSize = (info.nUndoSize += nAddSize);
if (!txdb.WriteBlockFileInfo(nFile, info))
return error("FindUndoPos() : cannot write updated block info");
}
unsigned int nOldChunks = (pos.nPos + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE;
unsigned int nNewChunks = (nNewSize + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE;
if (nNewChunks > nOldChunks) {
FILE *file = OpenUndoFile(pos);
if (file) {
printf("Pre-allocating up to position 0x%x in rev%05u.dat\n", nNewChunks * UNDOFILE_CHUNK_SIZE, pos.nFile);
AllocateFileRange(file, pos.nPos, nNewChunks * UNDOFILE_CHUNK_SIZE - pos.nPos);
}
fclose(file);
}
CBlockFileInfo info;
if (!txdb.ReadBlockFileInfo(nFile, info))
return error("FindUndoPos() : cannot read block info");
pos.nPos = info.nUndoSize;
info.nUndoSize += nAddSize;
if (!txdb.WriteBlockFileInfo(nFile, info))
return error("FindUndoPos() : cannot write updated block info");
return true;
}