Re: [PATCH 11/13] iomap: make buffered writes work with RWF_UNCACHED

[Matthew Wilcox]

On Fri, Nov 08, 2024 at 10:43:34AM -0700, Jens Axboe wrote:
> +++ b/fs/iomap/buffered-io.c
> @@ -959,6 +959,8 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
>  		}
>  		if (iter->iomap.flags & IOMAP_F_STALE)
>  			break;
> +		if (iter->flags & IOMAP_UNCACHED)
> +			folio_set_uncached(folio);

This seems like it'd convert an existing page cache folio into being
uncached?  Is this just leftover from a previous version or is that a
design decision you made?