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Re: [Qemu-block] [PATCH v2 for-2.10 09/16] block/qcow2: Generalize preal
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-block] [PATCH v2 for-2.10 09/16] block/qcow2: Generalize preallocate() |
Date: |
Thu, 6 Apr 2017 13:35:01 +0100 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Mon, Apr 03, 2017 at 06:09:29PM +0200, Max Reitz wrote:
> This patch adds two new parameters to the preallocate() function so we
> will be able to use it not just for preallocating a new image but also
> for preallocated image growth.
>
> The offset parameter allows the caller to specify a virtual offset from
> which to start preallocating. For newly created images this is always 0,
> but for preallocating growth this will be the old image length.
>
> The new_length parameter specifies the supposed new length of the image
> (basically the "end offset" for preallocation). During image truncation,
> bdrv_getlength() will return the old image length so we cannot rely on
> its return value then.
>
> Signed-off-by: Max Reitz <address@hidden>
> ---
> block/qcow2.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
Reviewed-by: Stefan Hajnoczi <address@hidden>
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- [Qemu-block] [PATCH v2 for-2.10 06/16] block/file-posix: Extract raw_regular_truncate(), (continued)
- [Qemu-block] [PATCH v2 for-2.10 06/16] block/file-posix: Extract raw_regular_truncate(), Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 08/16] block/file-posix: Preallocation for truncate, Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 07/16] block/file-posix: Generalize raw_regular_truncate, Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 09/16] block/qcow2: Generalize preallocate(), Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 10/16] block/qcow2: Lock s->lock in preallocate(), Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 11/16] block/qcow2: Metadata preallocation for truncate, Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 13/16] block/qcow2: qcow2_calc_size_usage() for truncate, Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 12/16] block/qcow2: Extract qcow2_calc_size_usage(), Max Reitz, 2017/04/03
- [Qemu-block] [PATCH v2 for-2.10 14/16] block/qcow2: falloc/full preallocating growth, Max Reitz, 2017/04/03