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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <bf57f3a0-4513-ef87-0f30-809d4276545b@fujitsu.com>
Date:   Thu, 21 Jul 2022 12:43:25 +0000
From:   "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>
To:     Andrew Morton <akpm@...ux-foundation.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>,
        "Darrick J. Wong" <djwong@...nel.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

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@...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?
> 
> 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@...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
>>>
>>>
>>>
> 
> 
>