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Native versions for AllocateFileRange()

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Pieter Wuille 2013-01-28 00:07:51 +01:00 committed by Pieter Wuille
parent 2835080e16
commit 288fdc092a
1 changed files with 39 additions and 0 deletions
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39
src/util.cpp
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@ -3,6 +3,15 @@
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef WIN32
// for posix_fallocate
#ifdef __linux__
#define _POSIX_C_SOURCE 200112L
#endif
#include <fcntl.h>
#include <sys/stat.h>
#endif
#include "util.h"
#include "sync.h"
#include "version.h"
@ -1155,6 +1164,35 @@ int GetFilesize(FILE* file)
// this function tries to make a particular range of a file allocated (corresponding to disk space)
// it is advisory, and the range specified in the arguments will never contain live data
void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
#if defined(WIN32)
// Windows-specific version
HANDLE hFile = (HANDLE)_get_osfhandle(_fileno(file));
LARGE_INTEGER nFileSize;
int64 nEndPos = (int64)offset + length;
nFileSize.u.LowPart = nEndPos & 0xFFFFFFFF;
nFileSize.u.HighPart = nEndPos >> 32;
SetFilePointerEx(hFile, nFileSize, 0, FILE_BEGIN);
SetEndOfFile(hFile);
#elif defined(MAC_OSX)
// OSX specific version
fstore_t fst;
fst.fst_flags = F_ALLOCATECONTIG;
fst.fst_posmode = F_PEOFPOSMODE;
fst.fst_offset = 0;
fst.fst_length = (off_t)offset + length;
fst.fst_bytesalloc = 0;
if (fcntl(fileno(file), F_PREALLOCATE, &fst) == -1) {
fst.fst_flags = F_ALLOCATEALL;
fcntl(fileno(file), F_PREALLOCATE, &fst);
}
ftruncate(fileno(file), fst.fst_length);
#elif defined(__linux__)
// Version using posix_fallocate
off_t nEndPos = (off_t)offset + length;
posix_fallocate(fileno(file), 0, nEndPos);
#else
// Fallback version
// TODO: just write one byte per block
static const char buf[65536] = {};
fseek(file, offset, SEEK_SET);
while (length > 0) {
@ -1164,6 +1202,7 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
fwrite(buf, 1, now, file); // allowed to fail; this function is advisory anyway
length -= now;
}
#endif
}
void ShrinkDebugFile()