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Re: [Qemu-devel] [RFC PATCH] block: optimize zero writes with bdrv_write

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH] block: optimize zero writes with bdrv_write_zeroes
Date: Mon, 24 Feb 2014 11:39:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 
Il 24/02/2014 02:01, Fam Zheng ha scritto:


I would do this in qcow2:

 1. In qcow2_co_writev, allocate cluster regardless of if data is zero or not.
 2. If data is zero, set QCOW2_OFLAG_ZERO in L2.


This is (or should be) bdrv_co_write_zeroes without BDRV_REQ_MAY_UNMAP.

Paolo
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