[PATCH] xfstests: fix msync() call in fsx.c:domapwrite()

[Christoph Hellwig]

On Tue, Feb 07, 2012 at 11:16:06AM -0800, Curt Wohlgemuth wrote:
> This explicitly sends MS_SYNC as the flag to msync() in
> fsx.c, in domapwrite().  Without this flag, the memory
> written to the mmap'ed region will not be flushed to disk;
> in fact, on Linux, calling msync() with a '0' or MS_ASYNC
> flag is a no-op.

Looks sensible to me - what exactly msync did has always been grossly
different for different operating systems, including changing meaning
on Linux a few times, so let's be explicit.

Reviewed-by: Christoph Hellwig <hch at lst.de>