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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.
This commit is contained in:
Karl-Johan Alm 2020-01-07 22:24:16 +09:00
parent 816464198c
commit 75163f4729
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GPG key ID: 57AF762DB3353322
1 changed files with 4 additions and 2 deletions
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6
src/util/system.cpp
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@ -974,17 +974,19 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
SetEndOfFile(hFile); SetEndOfFile(hFile);
#elif defined(MAC_OSX) #elif defined(MAC_OSX)
// OSX specific version // 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; fstore_t fst;
fst.fst_flags = F_ALLOCATECONTIG; fst.fst_flags = F_ALLOCATECONTIG;
fst.fst_posmode = F_PEOFPOSMODE; fst.fst_posmode = F_PEOFPOSMODE;
fst.fst_offset = 0; 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; fst.fst_bytesalloc = 0;
if (fcntl(fileno(file), F_PREALLOCATE, &fst) == -1) { if (fcntl(fileno(file), F_PREALLOCATE, &fst) == -1) {
fst.fst_flags = F_ALLOCATEALL; fst.fst_flags = F_ALLOCATEALL;
fcntl(fileno(file), F_PREALLOCATE, &fst); fcntl(fileno(file), F_PREALLOCATE, &fst);
} }
ftruncate(fileno(file), fst.fst_length); ftruncate(fileno(file), static_cast<off_t>(offset) + length);
#else #else
#if defined(__linux__) #if defined(__linux__)
// Version using posix_fallocate // Version using posix_fallocate