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[Qemu-devel] Cluster doesn't truncate after commit to backing file
From: |
lampahome |
Subject: |
[Qemu-devel] Cluster doesn't truncate after commit to backing file |
Date: |
Tue, 18 Sep 2018 13:05:29 +0800 |
I have two image A and B, and A is the backing file of B
I write data in address addr in A.
Then create B and set A as backing file of B.
Then I discard the same addr in B.
So the entry of addr in l2 table should be 1( also is
QCOW2_CLUSTER_ZERO_PLAIN)
, right?
But the addr cluster in A will fill with zero after I execute `qemu-img
commit B`
I thought it will truncate or decrease the ref count of the cluster
corresponding the addr, but it looks like just fill zero.
Is that the default behavior?
- [Qemu-devel] Cluster doesn't truncate after commit to backing file,
lampahome <=