Re: [Qemu-devel] [PATCH v4 04/19] block: move aio initialization into a helper function

[Kevin Wolf <kwolf@redhat.com>]

Am 20.09.2012 21:13, schrieb Jeff Cody:
> Move AIO initialization for raw-posix block driver into a helper function.
> 
> In addition to just code motion, the aio_ctx pointer is checked for NULL,
> prior to calling laio_init(), to make sure laio_init() is only run once.
> 
> Signed-off-by: Jeff Cody <jcody@redhat.com>
> ---
>  block/raw-posix.c | 53 +++++++++++++++++++++++++++++++++++------------------
>  1 file changed, 35 insertions(+), 18 deletions(-)
> 
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index 6be20b1..5981d04 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c

> @@ -240,25 +272,10 @@ static int raw_open_common(BlockDriverState *bs, const char *filename,
>      }
>  
>  #ifdef CONFIG_LINUX_AIO
> -    /*
> -     * Currently Linux do AIO only for files opened with O_DIRECT
> -     * specified so check NOCACHE flag too
> -     */
> -    if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
> -                      (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
> -
> -        s->aio_ctx = laio_init();
> -        if (!s->aio_ctx) {
> -            goto out_free_buf;
> -        }
> -        s->use_aio = 1;
> -    } else
> -#endif
> -    {
> -#ifdef CONFIG_LINUX_AIO
> -        s->use_aio = 0;
> -#endif
> +    if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) {
> +        goto out_close;

This leaks s->aligned_buf. It's removed later in the series anyway, so
no big deal, but if you need to respin for other reasons, probably worth
fixing.

Kevin