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[Qemu-block] [Questions] Several questions about incremental backup

From: Rudy Zhang
Subject: [Qemu-block] [Questions] Several questions about incremental backup
Date: Mon, 25 Jan 2016 15:35:13 +0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

I am reading and testing the function: incremental backup in qemu-2.5.
But I have serveral questions about it.
1. If I want to start image backup, at first I need to start full mode backup
   and then, add a bitmap to trace io, next start incremental backup via the
   bitmap before we added. But when the first incremental backup over, it will
   abdicate the bitmap. How can I start the second incremental backup without
   the bitmap to trace io? I don't know why abdicate the bitmap.
   Is it only an incremental backup?
2. When abdicating the bitmap, it seems leak memory about bitmap->successor.

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