[sheepdog] [PATCH] collie: add command 'collie vdi reset' to reset a cloned VDI

[levin li]

On 2012年08月29日 15:08, MORITA Kazutaka wrote:
> At Wed, 29 Aug 2012 13:57:57 +0800,
> levin li wrote:
>>
>> From: levin li <xingke.lwp at taobao.com>
>>
>> With this command, we can reset a cloned VDI to its initial state as
>> it's just cloned from a snapshot, the usage is simple:
>>
>> $ collie vdi reset cloned_vdi_name
>>
>> Signed-off-by: levin li <xingke.lwp at taobao.com>
>> ---
>>  collie/collie.h |    1 +
>>  collie/common.c |   35 ++++++++++++++++++++++++++++++
>>  collie/vdi.c    |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 99 insertions(+), 0 deletions(-)
> 
> What is the use case of this command?  Isn't it enough to delete the
> vdi and recreate it from snapshots?
> 
> Thanks,
> 
> Kazutaka
> 

It does the same thing as we delete the VDI first and recreate it, but faster than
the combination of the two commands, we don't need to call lookup_vdi too many times,
and many operations of the VDI deletion can be saved with this command if we only
want to reset the VDI.

thanks,

levin