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Re: [Qemu-devel] [PATCH 2/2] block: Inactivate all children

From: Fam Zheng
Subject: Re: [Qemu-devel] [PATCH 2/2] block: Inactivate all children
Date: Thu, 5 May 2016 08:32:24 +0800
User-agent: Mutt/1.6.0 (2016-04-01)

On Wed, 05/04 12:12, Kevin Wolf wrote:
> Am 19.04.2016 um 03:42 hat Fam Zheng geschrieben:
> > Currently we only inactivate the top BDS. Actually bdrv_inactivate
> > should be the opposite of bdrv_invalidate_cache.
> > 
> > Recurse into the whole subtree instead.
> > 
> > Signed-off-by: Fam Zheng <address@hidden>
> Did you actually test this?
> I would expect that bs->drv->bdrv_inactivate() fails now (as in
> assertion failure) if it has anything to flush to the image because
> bs->file has already be inactivated before. I think children need to be
> inactived after their parents.

OK, my test apparently failed to trigger that bdrv_pwritv() path. Good catch!

> Nodes with multiple parents could actually become even more
> interesting...

I'll make it two passes recursion: one for calling drv->bdrv_inactivate and the
other for setting BDRV_O_INACTIVATE.


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