From: Stefan Hajnoczi <stefanha@gmail.com>
To: Hu Tao <hutao@cn.fujitsu.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Peter Lieven <pl@kamp.de>,
Fam Zheng <famz@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH v3 2/6] block: add BlockDriver.bdrv_preallocate.
Date: Fri, 20 Dec 2013 11:10:30 +0100 [thread overview]
Message-ID: <20131220101030.GD27021@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <521cd9f1c99d5912c7438b1714fe4d0de758344e.1387419339.git.hutao@cn.fujitsu.com>
On Thu, Dec 19, 2013 at 10:27:37AM +0800, Hu Tao wrote:
> diff --git a/block.c b/block.c
> index 64e7d22..b901587 100644
> --- a/block.c
> +++ b/block.c
> @@ -3216,6 +3216,19 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
> return false;
> }
>
> +int bdrv_preallocate(BlockDriverState *bs, int64_t offset, int64_t length)
> +{
> + if (bs->backing_hd) {
> + return -ENOTSUP;
> + }
Depending on the image file format it may be possible to preallocate
metadata while using a backing file. Why prevent this?
next prev parent reply other threads:[~2013-12-20 10:10 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 2:27 [Qemu-devel] [RFC PATCH v3 0/6] qemu-img: add preallocation=full Hu Tao
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 1/6] block: introduce prealloc_mode Hu Tao
2013-12-20 10:08 ` Stefan Hajnoczi
2013-12-20 12:36 ` Eric Blake
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 2/6] block: add BlockDriver.bdrv_preallocate Hu Tao
2013-12-20 10:10 ` Stefan Hajnoczi [this message]
2013-12-24 8:31 ` Hu Tao
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 3/6] block/raw-posix: implement bdrv_preallocate Hu Tao
2013-12-20 10:14 ` Stefan Hajnoczi
2013-12-23 1:45 ` Hu Tao
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 4/6] raw-posix: Add full image preallocation option Hu Tao
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 5/6] qcow2: implement bdrv_preallocate Hu Tao
2013-12-20 10:19 ` Stefan Hajnoczi
2013-12-19 2:27 ` [Qemu-devel] [RFC PATCH v3 6/6] qcow2: Add full image preallocation option Hu Tao
2013-12-20 10:21 ` Stefan Hajnoczi
2013-12-20 10:30 ` [Qemu-devel] [RFC PATCH v3 0/6] qemu-img: add preallocation=full Stefan Hajnoczi
2013-12-20 12:54 ` Eric Blake
2013-12-23 1:59 ` Hu Tao
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