[Bug 50281] fsync patch for wine 6.0-rc1 (without staging)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50281

--- Comment #14 from Shmerl  ---
(In reply to Zebediah Figura from comment #13)
> fsync is less widely available than esync (e.g. it requires a much newer
> kernel, or I suppose I should say will require since IIRC sys_futex_waitv
> isn't even merged yet.) Additionally I believe fsync has been known to
> provide less stable performance in some cases, so it's not even clearly "at
> least as good".

Kernels usage will catch up (futex2 is in 5.16 which is coming out shortly),
but actual usefulness is more critical. If esync is in general not worse and
even better than using fsync / futex2 why did they even bother adding that to
the kernel?