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bug-fix macos: give free bytes to F_PREALLOCATE

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The macos manpage for fcntl (for F_PEOFPOSMODE) states:

> Allocate from the physical end of file.  In this case, fst_length indicates the number of newly allocated bytes desired.

Github-Pull: #17887
Rebased-From: 75163f4729c10c40d2843da28a8c79ab89193f6a
This commit is contained in:
Karl-Johan Alm 2020-01-07 22:24:16 +09:00 committed by fanquake
parent 4cf7350422
commit c8ad23c529
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GPG key ID: 2EEB9F5CC09526C1
1 changed files with 4 additions and 2 deletions
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6
src/util/system.cpp
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@ -1088,17 +1088,19 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
SetEndOfFile(hFile);
#elif defined(MAC_OSX)
// OSX specific version
// NOTE: Contrary to other OS versions, the OSX version assumes that
// NOTE: offset is the size of the file.
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_length = length; // mac os fst_length takes the # of free bytes to allocate, not desired file size
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);
ftruncate(fileno(file), static_cast<off_t>(offset) + length);
#else
#if defined(__linux__)
// Version using posix_fallocate