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Date: Thu, 5 May 2016 08:32:55 +0800
From: Fam Zheng <famz@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 1/2] block: Invalidate all children
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To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, Max Reitz <mreitz@redhat.com>

On Wed, 05/04 12:10, Kevin Wolf wrote:
> Am 19.04.2016 um 03:42 hat Fam Zheng geschrieben:
> > Currently we only recurse to bs->file, which will miss the children in quorum
> > and VMDK.
> > 
> > Recurse into the whole subtree to avoid that.
> > 
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  block.c | 20 ++++++++++++++------
> >  1 file changed, 14 insertions(+), 6 deletions(-)
> > 
> > diff --git a/block.c b/block.c
> > index d4939b4..fa8b38f 100644
> > --- a/block.c
> > +++ b/block.c
> > @@ -3201,6 +3201,7 @@ void bdrv_init_with_whitelist(void)
> >  
> >  void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp)
> >  {
> > +    BdrvChild *child;
> >      Error *local_err = NULL;
> >      int ret;
> >  
> > @@ -3215,13 +3216,20 @@ void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp)
> >  
> >      if (bs->drv->bdrv_invalidate_cache) {
> >          bs->drv->bdrv_invalidate_cache(bs, &local_err);
> > -    } else if (bs->file) {
> > -        bdrv_invalidate_cache(bs->file->bs, &local_err);
> 
> The old behaviour was that we only recurse for bs->file if the block
> driver doesn't have its own implementation.
> 
> This means that in qcow2, for example, we call bdrv_invalidate_cache()
> explicitly for bs->file. If we can already invalidate it here, the call
> inside qcow2 and probably other drivers could go away.

Yes, will update. Thanks.

Fam