Re: [PATCH] Btrfs-progs: make send/receive compatible with older kernels

[Wang Shilong <wangsl.fnst@cn.fujitsu.com>]

Hi Dave,

On 01/14/2014 11:27 PM, David Sterba wrote:
> On Thu, Jan 09, 2014 at 02:52:27PM +0000, Chris Mason wrote:
>>>     You may need to upgrade the kernel to get new features offered by a
>>> new userspace, but I think we should absolutely not be changing
>>> userspace in a way that makes it incompatible with older kernels.
>> I'd really prefer that we maintain compatibility with the older kernels.
>> Heavy btrfs usage is going to want a newer kernel anyway, but this is an
>> important policy to keep in place for the future.
> I agree.
>
>> Especially since Wang went to the trouble of making the patch, I'd
>> rather take it.
> What do you think about adding #ifdef's around the code? That way we'll
> know that's for backwards compatibility only and up to what kernel
> version. It will be easier to remove it in the far future.
Sounds a good idea, would you describe it more specific so that
i can give a v2.^_^

Thanks，
Wang
>
>
> david
>