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

Shiyang Ruan
2022-07-01T05:14:58Z

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.

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
>>
>>
>>