[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH V14 1/6] docs: document for add-cow file format
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH V14 1/6] docs: document for add-cow file format |
Date: |
Fri, 26 Oct 2012 10:34:27 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 26.10.2012 04:54, schrieb Dong Xu Wang:
> On Thu, Oct 25, 2012 at 10:56 PM, Eric Blake <address@hidden> wrote:
>> On 10/25/2012 07:36 AM, Dong Xu Wang wrote:
>>> +
>>> + 64 - 79: image file format
>>> + Format of image file. It must be non-empty. It is
>>> coded
>>> + in free-form ASCII, and is not NUL-terminated. Zero
>>> + padded on the right.
>>
>> [1]...here you claim that backing and image file format are mandatory
>> (must not be empty). Shouldn't you allow the file format to be empty,
>> in which case qemu will probe? And why do you even need image file
>> format - isn't the whole point of add-cow to wrap a raw image file, or
>> are you planning on also being able to wrap non-raw files? Are there
>> other non-raw file formats that lack backing file support, where add-cow
>> can be used to give it a backing file?
>>
>
> Kevin or Stefan, can you give me some opinion? Thanks.
Yes, there are plenty of other block drivers that don't support backing
files, either because their image format/protocol can't provide such
information or just because it's not implemented in qemu today.
Kevin
- [Qemu-devel] [PATCH V14 0/6] add-cow file format, Dong Xu Wang, 2012/10/25
- [Qemu-devel] [PATCH V14 2/6] make path_has_protocol non static, Dong Xu Wang, 2012/10/25
- [Qemu-devel] [PATCH V14 3/6] qed_read_string to bdrv_read_string, Dong Xu Wang, 2012/10/25
- [Qemu-devel] [PATCH V14 5/6] add-cow file format core code., Dong Xu Wang, 2012/10/25
- [Qemu-devel] [PATCH V14 4/6] rename qcow2-cache.c to block-cache.c, Dong Xu Wang, 2012/10/25
- [Qemu-devel] [PATCH V14 6/6] qemu-iotests: add add-cow iotests support., Dong Xu Wang, 2012/10/25