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

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Date:   Thu, 21 Jul 2022 14:06:10 +0000
From:   "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>
To:     "Darrick J. Wong" <djwong@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "david@...morbit.com" <david@...morbit.com>,
        "hch@...radead.org" <hch@...radead.org>
Subject: Re: [PATCH] xfs: fail dax mount if reflink is enabled on a partition

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@...itsu.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?
> 
> 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.

BTW, since these patches (dax&reflink&rmap + THIS + pmem-unbind) are 
waiting to be merged, is it time to think about "removing the 
experimental tag" again?  :)


--
Thanks,
Ruan.

> 
> Reviewed-by: Darrick J. Wong <djwong@...nel.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
>>
>>
>>