Re: [Qemu-devel] [PATCH 22/23] migration: propagate error correctly

[Anthony Liguori <anthony@codemonkey.ws>]

On 09/23/2011 07:57 AM, Juan Quintela wrote:
> unix and tcp outgoing migration have error values, but didn't returned
> it.  Make them return the error.  Notice that EINPROGRESS&  EWOULDBLOCK
> are not considered errors as callwill be retry later.
>
> Signed-off-by: Juan Quintela<quintela@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   migration-tcp.c  |   20 +++++++++++---------
>   migration-unix.c |   26 ++++++++++----------------
>   2 files changed, 21 insertions(+), 25 deletions(-)
>
> diff --git a/migration-tcp.c b/migration-tcp.c
> index bd3aa3a..619df21 100644
> --- a/migration-tcp.c
> +++ b/migration-tcp.c
> @@ -90,26 +90,28 @@ int tcp_start_outgoing_migration(MigrationState *s, const char *host_port)
>
>       s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
>       if (s->fd == -1) {
> -        return -1;
> +        return -socket_error();
>       }
>
>       socket_set_nonblock(s->fd);
>
>       do {
>           ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
> -        if (ret == -1)
> -            ret = -(socket_error());
> -
> -        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
> +        if (ret == -1) {
> +            ret = -socket_error();
> +        }
> +        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) {
>               qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
> +            return 0;
> +        }
>       } while (ret == -EINTR);
>
> -    if (ret<  0&&  ret != -EINPROGRESS&&  ret != -EWOULDBLOCK) {
> +    if (ret<  0) {
>           DPRINTF("connect failed\n");
>           migrate_fd_error(s);
> -    } else if (ret>= 0)
> -        migrate_fd_connect(s);
> -
> +        return ret;
> +    }
> +    migrate_fd_connect(s);
>       return 0;
>   }
>
> diff --git a/migration-unix.c b/migration-unix.c
> index 7205b25..428fe66 100644
> --- a/migration-unix.c
> +++ b/migration-unix.c
> @@ -89,35 +89,29 @@ int unix_start_outgoing_migration(MigrationState *s, const char *path)
>       s->fd = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
>       if (s->fd<  0) {
>           DPRINTF("Unable to open socket");
> -        goto err_after_socket;
> +        return -errno;
>       }
>
>       socket_set_nonblock(s->fd);
>
>       do {
>           ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
> -        if (ret == -1)
> +        if (ret == -1) {
>               ret = -errno;
> -
> -        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
> +        }
> +        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) {
>   	    qemu_set_fd_handler2(s->fd, NULL, NULL, unix_wait_for_connect, s);
> +            return 0;
> +        }
>       } while (ret == -EINTR);
>
> -    if (ret<  0&&  ret != -EINPROGRESS&&  ret != -EWOULDBLOCK) {
> +    if (ret<  0) {
>           DPRINTF("connect failed\n");
> -        goto err_after_open;
> +        migrate_fd_error(s);
> +        return ret;
>       }
> -
> -    if (ret>= 0)
> -        migrate_fd_connect(s);
> -
> +    migrate_fd_connect(s);
>       return 0;
> -
> -err_after_open:
> -    close(s->fd);
> -
> -err_after_socket:
> -    return -1;
>   }
>
>   static void unix_accept_incoming_migration(void *opaque)