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Re: [Qemu-devel] [PATCH 3/4 v2 RESEND] block: add dirty flag status to q
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH 3/4 v2 RESEND] block: add dirty flag status to qemu-img |
Date: |
Tue, 13 Mar 2012 11:10:37 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1 |
Am 13.03.2012 10:33, schrieb Stefan Hajnoczi:
> On Tue, Mar 13, 2012 at 10:03:51AM +0100, Kevin Wolf wrote:
>> Am 12.03.2012 19:18, schrieb Stefan Hajnoczi:
>>> On Wed, Mar 07, 2012 at 05:22:58PM +0800, Dong Xu Wang wrote:
>>>> From: Dong Xu Wang <address@hidden>
>>>>
>>>> Some block drivers can verify their image files are clean or not. So we
>>>> can show
>>>> it while using "qemu-img info.
>>>>
>>>> Signed-off-by: Dong Xu Wang <address@hidden>
>>>> ---
>>>> block.c | 14 ++++++++++++++
>>>> block.h | 2 ++
>>>> block_int.h | 1 +
>>>> qemu-img.c | 3 +++
>>>> 4 files changed, 20 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/block.c b/block.c
>>>> index 947607b..17e9ba8 100644
>>>> --- a/block.c
>>>> +++ b/block.c
>>>> @@ -193,6 +193,20 @@ static void bdrv_io_limits_intercept(BlockDriverState
>>>> *bs,
>>>> qemu_co_queue_next(&bs->throttled_reqs);
>>>> }
>>>>
>>>> +/* check if the image was cleanly shut down */
>>>> +bool bdrv_not_cleanly_down(BlockDriverState *bs)
>>>
>>> The name is a little cryptic to me and I suggest avoiding 'not' in
>>> function names because it easily leads to double-negatives (!not_foo()).
>>>
>>> How about:
>>>
>>> bool bdrv_was_shutdown_cleanly()
>>>
>>> if (!bdrv_was_shutdown_cleanly(bs)) {
>>> printf(...);
>>> }
>>>
>>> This patch and the QED patch look fine otherwise.
>>
>> Should we rather add a new field to BlockDriverInfo and use the existing
>> bdrv_get_info() function?
>
> Yeah, that sounds good. In that case it's best to make the "clean"
> value false and the "dirty" value true, so that block drivers that don't
> care about this feature automatically report "clean".
>
> struct BlockDriverInfo {
> bool is_dirty;
> }
Yes, I agree.
Kevin
Re: [Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qemu-img, Stefan Hajnoczi, 2012/03/12