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Re: [Qemu-devel] [PATCH v2] block: Turn on "unmap" in active commit


From: Fam Zheng
Subject: Re: [Qemu-devel] [PATCH v2] block: Turn on "unmap" in active commit
Date: Tue, 27 Sep 2016 18:13:38 +0800
User-agent: Mutt/1.7.0 (2016-08-17)

On Tue, 09/27 17:33, Fam Zheng wrote:
> We already specified BDRV_O_UNMAP when opening images in 'qemu-img
> commit', but didn't turn on the "unmap" in the active commit job. This
> patch fixes that so that zeroed clusters in top image can be discarded
> which is desired in the virt-sparsify use case, where a temporary
> overlay is created and fstrim'ed before commiting back, to free space in
> the original image.
> 
> This also enables it for block-commit.
> 
> Signed-off-by: Fam Zheng <address@hidden>

Sent too soon. I see a number of iotests failures (020 040 097 129),
still investigating.

Fam



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