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[Qemu-devel] How to discard one range which overlap with backing file an
From: |
lampahome |
Subject: |
[Qemu-devel] How to discard one range which overlap with backing file and its children img? |
Date: |
Tue, 7 Aug 2018 15:06:55 +0800 |
I have image A & B, and A is backing file of B.
After I mount A to /dev/nbd0 and I write from position 0~999 in nbd0.
Then create B and set A as backing file of B.
I mount B on /dev/nbd1 and I can saw the data from pos:0~999 because A is
B's backing file. That's reasonable.
But I want to discard range 0~500 in B. I expect there's no data in 0~500
after discard and re-mount B next time.
But the data is still in A.
How can I discard range 0~500?
- [Qemu-devel] How to discard one range which overlap with backing file and its children img?,
lampahome <=