Re: [PATCH] xfs: fail dax mount if reflink is enabled on a partition

["ruansy.fnst@fujitsu.com" <ruansy.fnst@fujitsu.com>]

Hi Andrew,

I am not sure if you had seen this.  So make a ping.

在 2022/7/1 13:14, Shiyang Ruan 写道:
> 
> 
> 在 2022/7/1 8:31, Darrick J. Wong 写道:
>> On Thu, Jun 09, 2022 at 10:34:35PM +0800, Shiyang Ruan wrote:
>>> Failure notification is not supported on partitions.  So, when we mount
>>> a reflink enabled xfs on a partition with dax option, let it fail with
>>> -EINVAL code.
>>>
>>> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
>>
>> Looks good to me, though I think this patch applies to ... wherever all
>> those rmap+reflink+dax patches went.  I think that's akpm's tree, right?
> 
> Yes, they are in his tree, still in mm-unstable now.
> 
>>
>> Ideally this would go in through there to keep the pieces together, but
>> I don't mind tossing this in at the end of the 5.20 merge window if akpm
>> is unwilling.

What's your opinion on this?  I found that the rmap+reflink+dax patches have been merged into mm-stable,  so maybe it's a bit late to merge this one.  ( I'm not pushing, just to know the situation. )


--
Thanks,
Ruan. 

> 
> Both are fine to me.  Thanks!
> 
> 
> -- 
> Ruan.
> 
>>
>> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
>>
>> --D
>>
>>> ---
>>>   fs/xfs/xfs_super.c | 6 ++++--
>>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
>>> index 8495ef076ffc..a3c221841fa6 100644
>>> --- a/fs/xfs/xfs_super.c
>>> +++ b/fs/xfs/xfs_super.c
>>> @@ -348,8 +348,10 @@ xfs_setup_dax_always(
>>>           goto disable_dax;
>>>       }
>>> -    if (xfs_has_reflink(mp)) {
>>> -        xfs_alert(mp, "DAX and reflink cannot be used together!");
>>> +    if (xfs_has_reflink(mp) &&
>>> +        bdev_is_partition(mp->m_ddev_targp->bt_bdev)) {
>>> +        xfs_alert(mp,
>>> +            "DAX and reflink cannot work with multi-partitions!");
>>>           return -EINVAL;
>>>       }
>>> -- 
>>> 2.36.1
>>>
>>>
>>>
> 
> 
>