Re: [Qemu-block] [PATCH 2/2] file-posix: Make .bdrv_co_truncate asynchronous

[Max Reitz]

On 2018-06-21 19:06, Kevin Wolf wrote:
> This moves the code to resize an image file to the thread pool to avoid
> blocking.
> 
> Creating large images with preallocation with blockdev-create is now
> actually a background job instead of blocking the monitor (and most
> other things) until the preallocation has completed.
> 
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
>  include/block/raw-aio.h |   4 +-
>  block/file-posix.c      | 265 
> +++++++++++++++++++++++++++---------------------
>  2 files changed, 153 insertions(+), 116 deletions(-)

[...]

> diff --git a/block/file-posix.c b/block/file-posix.c
> index 6223a8bccc..fa918f2bdb 100644
> --- a/block/file-posix.c
> +++ b/block/file-posix.c
> @@ -188,8 +188,16 @@ typedef struct RawPosixAIOData {
>  #define aio_ioctl_cmd   aio_nbytes /* for QEMU_AIO_IOCTL */
>      off_t aio_offset;
>      int aio_type;
> -    int aio_fd2;
> -    off_t aio_offset2;
> +    union {
> +        struct {
> +            int aio_fd2;
> +            off_t aio_offset2;
> +        };
> +        struct {
> +            PreallocMode prealloc;
> +            Error **errp;
> +        };
> +    };

Comments might help (that the first struct is for *_COPY_RANGE and the
second one is for *_TRUNCATE).

But in general (without having actual knowledge of file-posix's AIO pool):

Reviewed-by: Max Reitz <address@hidden>

>  } RawPosixAIOData;
>  
>  #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)

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