Re: [PATCH v6 04/16] iomap: Add flags parameter to iomap_page_create()

[Christoph Hellwig <hch@infradead.org>]

On Thu, May 26, 2022 at 10:38:28AM -0700, Stefan Roesch wrote:
> Add the kiocb flags parameter to the function iomap_page_create().
> Depending on the value of the flags parameter it enables different gfp
> flags.
> 
> No intended functional changes in this patch.
> 
> Signed-off-by: Stefan Roesch <shr@fb.com>
> Reviewed-by: Jan Kara <jack@suse.cz>
> ---
>  fs/iomap/buffered-io.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 8ce8720093b9..d6ddc54e190e 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -44,16 +44,21 @@ static inline struct iomap_page *to_iomap_page(struct folio *folio)
>  static struct bio_set iomap_ioend_bioset;
>  
>  static struct iomap_page *
> -iomap_page_create(struct inode *inode, struct folio *folio)
> +iomap_page_create(struct inode *inode, struct folio *folio, unsigned int flags)
>  {
>  	struct iomap_page *iop = to_iomap_page(folio);
>  	unsigned int nr_blocks = i_blocks_per_folio(inode, folio);
> +	gfp_t gfp = GFP_NOFS | __GFP_NOFAIL;
>  
>  	if (iop || nr_blocks <= 1)
>  		return iop;
>  
> +	if (flags & IOMAP_NOWAIT)
> +		gfp = GFP_NOWAIT;
> +

Maybe this would confuse people less if it was:

	if (flags & IOMAP_NOWAIT)
		gfp = GFP_NOWAIT;
	else
		gfp = GFP_NOFS | __GFP_NOFAIL;

but even as is it is perfectly fine (and I tend to write these kinds of
shortcuts as well).

Looks good either way:

Reviewed-by: Christoph Hellwig <hch@lst.de>