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This commit adds a win32 implementation for fsync_no_flush that is called git_fsync. The 'NtFlushBuffersFileEx' function being called is available since Windows 8. If the function is not available, we return -1 and Git falls back to doing a full fsync. The operating system is told to flush data only without a hardware flush primitive. A later full fsync will cause the metadata log to be flushed and then the disk cache to be flushed on NTFS and ReFS. Other filesystems will treat this as a full flush operation. I added a new file here for this system call so as not to conflict with downstream changes in the git-for-windows repository related to fscache. Signed-off-by: Neeraj Singh <neerajsi@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>