Re: [Qemu-block] [Qemu-devel] [PATCH] aio-posix: fill error message that is missed

[Eric Blake]

On 07/12/2016 05:34 AM, Cao jin wrote:
> The current judegement of caller is meaningless, make it useful.

Is this something you can trigger? If so, what command line?  If not,
how did you find it?

Spelled 'judgment', not 'judegement'; but rather than just fixing the
typo, it might read better as:

The lone caller of aio_context_setup() only checks whether an error was
set, but aio_context_setup() is not setting an error.

> 
> Signed-off-by: Cao jin <address@hidden>
> ---
>  aio-posix.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/aio-posix.c b/aio-posix.c
> index 6006122..8b0deb7 100644
> --- a/aio-posix.c
> +++ b/aio-posix.c
> @@ -18,6 +18,7 @@
>  #include "block/block.h"
>  #include "qemu/queue.h"
>  #include "qemu/sockets.h"
> +#include "qapi/error.h"
>  #ifdef CONFIG_EPOLL_CREATE1
>  #include <sys/epoll.h>
>  #endif
> @@ -491,6 +492,7 @@ void aio_context_setup(AioContext *ctx, Error **errp)
>      assert(!ctx->epollfd);
>      ctx->epollfd = epoll_create1(EPOLL_CLOEXEC);
>      if (ctx->epollfd == -1) {
> +        error_setg_errno(errp, errno, "Failed to create epoll instance");
>          ctx->epoll_available = false;
>      } else {
>          ctx->epoll_available = true;

However, I'm not even sure your patch is right.  The mere fact that we
have ctx->epoll_available makes it sound like we WANT to be able to
gracefully fall back when epoll is not available, rather than raising an
error message.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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