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Re: [Qemu-devel] [PATCH v5] migration/block: use blk_pwrite_zeroes for e

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v5] migration/block: use blk_pwrite_zeroes for each zero cluster
Date: Wed, 12 Apr 2017 08:19:49 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 04/12/2017 08:07 AM, address@hidden wrote:
> From: Lidong Chen <address@hidden>
> BLOCK_SIZE is (1 << 20), qcow2 cluster size is 65536 by default,
> this maybe cause the qcow2 file size is bigger after migration.

s/is bigger/to be bigger/

> This patch check each cluster, use blk_pwrite_zeroes for each


> zero cluster.
> Signed-off-by: Lidong Chen <address@hidden>
> ---

Please use this space (after the ---) to state how v5 differs from v4,
in order to save reviewers some time.

>  migration/block.c | 35 +++++++++++++++++++++++++++++++++--
>  1 file changed, 33 insertions(+), 2 deletions(-)

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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