Re: [BLOCK] bh: Ensure bh fits within a page

[Andi Kleen]

Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> writes:
> --
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 71649ef..b998f08 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -2790,6 +2790,7 @@ int submit_bh(int rw, struct buffer_head
>  	BUG_ON(!buffer_locked(bh));
>  	BUG_ON(!buffer_mapped(bh));
>  	BUG_ON(!bh->b_end_io);
> +	WARN_ON(bh_offset(bh) + bh->b_size > PAGE_SIZE);

What happens when someone implements direct large page IO?

-Andi
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