bug#60474: 30.0.50; `write-region-inhibit-fsync' and copy-on-write file systems

[Eli Zaretskii]

> Date: Sun, 1 Jan 2023 19:21:20 -0800
> Cc: 60474@debbugs.gnu.org, orgmode@tec.tecosaur.net,
>  Ihor Radchenko <yantar92@posteo.net>
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> > Paul, any comments?
> 
> Sure, Emacs should do the reverse of what it's doing now. That is, Emacs 
> should use fsync only in special situations, instead of avoiding it only 
> in special situations. In the old days it may have made sense to use 
> fsync, but nowadays most platforms don't need fsync for the sorts of 
> things people use interactive Emacs.
> 
> For what it's worth I've had (setq write-region-inhibit-fsync t) in my 
> init file for many years, without problems.
> 
> Proposed patch attached.

Thanks, this is okay for master, but could you perhaps add a sentence,
in the manual and in NEWS, about the exceptional situations when this
variable should be reset to nil?  I think we should say something,
otherwise the need for the variable is questionable.