Re: [Qemu-devel] [PATCH v3] block/vdi: Use bdrv_flush after metadata updates

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Thu, May 07, 2015 at 12:04:56PM +0800, Zhe Qiu wrote:
> From: phoeagon <phoeagon@gmail.com>
> 
> In reference to b0ad5a455d7e5352d4c86ba945112011dbeadfb8~078a458e077d6b0db262c4b05fee51d01de2d1d2, metadata writes to qcow2/cow/qcow/vpc/vmdk are all synced prior to succeeding writes.
> 
> Only when write is successful that bdrv_flush is called.
> 
> Signed-off-by: Zhe Qiu <phoeagon@gmail.com>
> ---
>  block/vdi.c | 3 +++
>  1 file changed, 3 insertions(+)

CCing Stefan Weil and Kevin Wolf (see output from
scripts/get_maintainer.pl -f block/vdi.c).

> 
> diff --git a/block/vdi.c b/block/vdi.c
> index 7642ef3..dfe8ade 100644
> --- a/block/vdi.c
> +++ b/block/vdi.c
> @@ -713,6 +713,9 @@ static int vdi_co_write(BlockDriverState *bs,
>          logout("will write %u block map sectors starting from entry %u\n",
>                 n_sectors, bmap_first);
>          ret = bdrv_write(bs->file, offset, base, n_sectors);
> +        if (ret >= 0) {
> +            ret = bdrv_flush(bs->file);
> +        }
>      }
>  
>      return ret;
> -- 
> 2.4.0
> 
> 

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