[PATCH 05/33] block: Add bio_list_peek()

[Benjamin Herrenschmidt]

On Wed, 2009-06-10 at 16:38 +0200, Geert Uytterhoeven wrote:
> Introduce bio_list_peek(), to obtain a pointer to the first bio on the bio_list
> without actually removing it from the list. This is needed when you want to
> serialize based on the list being empty or not.

Leaving that one (and the next one) out for now until Jens Ack them.

Cheers,
Ben.

> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>
> Cc: Jens Axboe <axboe at kernel.dk>
> ---
>  include/linux/bio.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 7b214fd..618bb7d 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -590,6 +590,11 @@ static inline void bio_list_merge_head(struct bio_list *bl,
>  	bl->head = bl2->head;
>  }
>  
> +static inline struct bio *bio_list_peek(struct bio_list *bl)
> +{
> +	return bl->head;
> +}
> +
>  static inline struct bio *bio_list_pop(struct bio_list *bl)
>  {
>  	struct bio *bio = bl->head;