Re: [patch] aio: Don't zero out the pages array inside struct dio

[Jeff Moyer <jmoyer@redhat.com>]

Andrew Morton <akpm@linux-foundation.org> writes:

> You forgot something:
>
> --- a/fs/direct-io.c~aio-dont-zero-out-the-pages-array-inside-struct-dio-fix
> +++ a/fs/direct-io.c
> @@ -130,6 +130,12 @@ struct dio {
>  	unsigned head;			/* next page to process */
>  	unsigned tail;			/* last valid page + 1 */
>  	int page_errors;		/* errno from get_user_pages() */
> +
> +	/*
> +	 * pages[] (and any fields placed after it) are not zeroed out at
> +	 * allocation time.  Don't add new fields after pages[] unless you
> +	 * wish that they not be zeroed.
> +	 */
>  	struct page *pages[DIO_PAGES];	/* page buffer */
>  };
>  

Yeah, that makes sense.  Thanks for adding it, Andrew.  Oh, and it looks
like I botched the subject line.  It should have read dio, not aio, but
I'm not sure that matters a whole lot.

Cheers,
Jeff