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Re: [Qemu-devel] [Qemu-block] [PATCH v2 2/3] block/parallals: Do not upd


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH v2 2/3] block/parallals: Do not update header or truncate image when INMIGRATE
Date: Fri, 3 Nov 2017 11:05:00 +0000
User-agent: Mutt/1.9.1 (2017-09-22)

On Mon, Oct 30, 2017 at 02:10:27PM +0100, Jeff Cody wrote:
> If we write or modify the image file while the QEMU run state is
> INMIGRATE, then the BDRV_O_INACTIVE BDS flag is set.  This will cause
> an assert, since the image is marked inactive.  Make sure we obey this
> flag.
> 
> Signed-off-by: Jeff Cody <address@hidden>
> ---
>  block/parallels.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/block/parallels.c b/block/parallels.c
> index 2b6c6e5709..7b7a3efa1d 100644
> --- a/block/parallels.c
> +++ b/block/parallels.c
> @@ -708,7 +708,7 @@ static int parallels_open(BlockDriverState *bs, QDict 
> *options, int flags,
>          s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
>      }
>  
> -    if (flags & BDRV_O_RDWR) {
> +    if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) {
>          s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
>          ret = parallels_update_header(bs);
>          if (ret < 0) {

Where do we ensure that HEADER_INUSE_MAGIC is set on the destination?

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