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Re: [PATCH v4 4/9] qcow2: Support BDRV_REQ_ZERO_WRITE for truncate
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From: |
Alberto Garcia |
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Subject: |
Re: [PATCH v4 4/9] qcow2: Support BDRV_REQ_ZERO_WRITE for truncate |
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Date: |
Mon, 20 Apr 2020 16:02:39 +0200 |
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User-agent: |
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
On Mon 20 Apr 2020 03:32:09 PM CEST, Kevin Wolf wrote:
> If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
> qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
> undo any previous preallocation, but just adds the zero flag to all
> relevant L2 entries. If an external data file is in use, a write_zeroes
> request to the data file is made instead.
>
> Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Alberto Garcia <address@hidden>
Berto