Neeraj Singh ce1fc37f92 core.fsyncobjectfiles: add windows support for batch mode ...

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>

2022-01-15 11:06:29 +01:00

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