mirror of
https://github.com/git-for-windows/git.git
synced 2026-04-22 23:37:25 -05:00
ce1fc37f92
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>
29 lines
694 B
C
29 lines
694 B
C
#include "../../git-compat-util.h"
|
|
#include <winternl.h>
|
|
#include "lazyload.h"
|
|
|
|
int win32_fsync_no_flush(int fd)
|
|
{
|
|
IO_STATUS_BLOCK io_status;
|
|
|
|
#define FLUSH_FLAGS_FILE_DATA_ONLY 1
|
|
|
|
DECLARE_PROC_ADDR(ntdll.dll, NTSTATUS, NTAPI, NtFlushBuffersFileEx,
|
|
HANDLE FileHandle, ULONG Flags, PVOID Parameters, ULONG ParameterSize,
|
|
PIO_STATUS_BLOCK IoStatusBlock);
|
|
|
|
if (!INIT_PROC_ADDR(NtFlushBuffersFileEx)) {
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
memset(&io_status, 0, sizeof(io_status));
|
|
if (NtFlushBuffersFileEx((HANDLE)_get_osfhandle(fd), FLUSH_FLAGS_FILE_DATA_ONLY,
|
|
NULL, 0, &io_status)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|