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Implement falloc equivalent in OSX

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This commit is contained in:
Nils Maier 2014-03-27 19:54:24 +01:00
parent a95674aef3
commit 7600886d3d
2 changed files with 20 additions and 1 deletions
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18
src/AbstractDiskWriter.cc
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@ -483,6 +483,24 @@ void AbstractDiskWriter::allocate(int64_t offset, int64_t length, bool sparse)
#ifdef HAVE_SOME_FALLOCATE
# ifdef __MINGW32__
truncate(offset+length);
# elif defined(__APPLE__) && defined(__MACH__)
auto toalloc = offset + length - size();
if (toalloc > 0) {
fstore_t fstore = {F_ALLOCATECONTIG | F_ALLOCATEALL, F_PEOFPOSMODE, 0, toalloc};
if (fcntl(fd_, F_PREALLOCATE, &fstore) == -1) {
// Retry non-contig.
fstore.fst_flags = F_ALLOCATEALL;
if (fcntl(fd_, F_PREALLOCATE, &fstore) == -1) {
int err = errno;
throw DL_ABORT_EX3(err,
fmt("fcntl(F_PREALLOCATE failed. cause: %s",
util::safeStrerror(err).c_str()),
error_code::FILE_IO_ERROR);
}
}
}
// This forces the allocation on disk.
ftruncate(fd_, offset + length);
# elif HAVE_FALLOCATE
// For linux, we use fallocate to detect file system supports
// fallocate or not.