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Date: Tue, 10 Mar 2015 10:58:11 +0800
From: Fam Zheng <famz@redhat.com>
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Subject: Re: [Qemu-devel] [RFC] introduce bitmap to bdrv_commit to
 trackdirtysector
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To: Zhang Haoyu <zhanghy@sangfor.com.cn>
Cc: Kevin Wolf <kwolf@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, vsementsov <vsementsov@parallels.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, jsnow <jsnow@redhat.com>

> Is it worthy to implement it?

Maybe, I think once we start to assign node-name to each BDS in the tree, this
will be natural to implement.

> And does qemu support commit any external snapshot to its backing file?

Yes.