[RFC PATCH 11/10] pipe: Add fsync() support [ver #2]

[Linus Torvalds]

On Sat, Nov 2, 2019 at 3:03 PM Linus Torvalds
<torvalds at linux-foundation.org> wrote:
>
> On Sat, Nov 2, 2019 at 1:31 PM Andy Lutomirski <luto at amacapital.net> wrote:
> >
> > Add in the fact that it’s not obvious that vmsplice *can* be used correctly, and I’m wondering if we should just remove it or make it just do write() under the hood.
>
> Sure it can. Just don't modify the data you vmsplice. It's really that simple.
>
> That said, if we don't have any actual users, then we should look at
> removing it (maybe turning it into "write()" as you say). Not because
> it's hard to use, but simply because it probably doesn't have that
> many uses.

Looking at debian code search, there are _some_ uses (including
openssl and fuse):

  https://codesearch.debian.net/search?q=%3D+vmsplice%28&literal=1

but I didn't check any more closely what they do.

             Linus