Re: [Qemu-devel] [PATCH v6 2/2] block: Support GlusterFS as a QEMU block backend

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

On Fri, Sep 07, 2012 at 05:11:33PM +0200, Paolo Bonzini wrote:
> This is a bug that has to be fixed anyway.  There are provisions in
> aio.c, but they are broken apparently.  Can you try this:
> 
> diff --git a/aio.c b/aio.c
> index 0a9eb10..99b8b72 100644
> --- a/aio.c
> +++ b/aio.c
> @@ -119,7 +119,7 @@ bool qemu_aio_wait(void)
>          return true;
>      }
> 
> -    walking_handlers = 1;
> +    walking_handlers++;
> 
>      FD_ZERO(&rdfds);
>      FD_ZERO(&wrfds);
> @@ -147,7 +147,7 @@ bool qemu_aio_wait(void)
>          }
>      }
> 
> -    walking_handlers = 0;
> +    walking_handlers--;
> 
>      /* No AIO operations?  Get us out of here */
>      if (!busy) {
> @@ -159,7 +159,7 @@ bool qemu_aio_wait(void)
> 
>      /* if we have any readable fds, dispatch event */
>      if (ret > 0) {
> -        walking_handlers = 1;
> +        walking_handlers++;
> 
>          /* we have to walk very carefully in case
>           * qemu_aio_set_fd_handler is called while we're walking */
> @@ -187,7 +187,7 @@ bool qemu_aio_wait(void)
>              }
>          }
> 
> -        walking_handlers = 0;
> +        walking_handlers--;
>      }
> 
>      return true;
> 

This works. I am able to create qcow2 files on gluster backend with this fix.

Regards,
Bharata.