#if defined(HAVE_POSIX_FALLOCATE)
// If we have posix_fallocate use it. Unlike ftruncate it always allocates
// space, so we get an error if the disk is full.
- if (int Err = ::posix_fallocate(FD, 0, Size))
- return std::error_code(Err, std::generic_category());
-#else
+ if (int Err = ::posix_fallocate(FD, 0, Size)) {
+ if (Err != EOPNOTSUPP)
+ return std::error_code(Err, std::generic_category());
+ }
+#endif
// Use ftruncate as a fallback. It may or may not allocate space. At least on
// OS X with HFS+ it does.
if (::ftruncate(FD, Size) == -1)
return std::error_code(errno, std::generic_category());
-#endif
return std::error_code();
}