Re: [PATCH 4/7] fuse: Move prefaulting out of hot write path

[Miklos Szeredi]

On Wed, 29 Jan 2025 at 19:17, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> wrote:
>
>
> From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
>
> Prefaulting the write source buffer incurs an extra userspace access
> in the common fast path. Make fuse_fill_write_pages() consistent with
> generic_perform_write(): only touch userspace an extra time when
> copy_folio_from_iter_atomic() has failed to make progress.
>
> Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: Miklos Szeredi <miklos@xxxxxxxxxx>

Applied, thanks.

Miklos