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Message-ID: <113e8b0d-7349-94ac-c017-3624c34fe73b@fujitsu.com>
Date:   Mon, 28 Nov 2022 10:16:23 +0800
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Subject: Re: [PATCH 0/2] fsdax,xfs: fix warning messages
To:     "Darrick J. Wong" <djwong@kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
        <nvdimm@lists.linux.dev>, <linux-fsdevel@vger.kernel.org>,
        <david@fromorbit.com>, <dan.j.williams@intel.com>
References: <1669301694-16-1-git-send-email-ruansy.fnst@fujitsu.com>
 <Y4OuntOVjId9FLzL@magnolia>
From:   Shiyang Ruan <ruansy.fnst@fujitsu.com>
In-Reply-To: <Y4OuntOVjId9FLzL@magnolia>
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在 2022/11/28 2:38, Darrick J. Wong 写道:
> On Thu, Nov 24, 2022 at 02:54:52PM +0000, Shiyang Ruan wrote:
>> Many testcases failed in dax+reflink mode with warning message in dmesg.
>> This also effects dax+noreflink mode if we run the test after a
>> dax+reflink test.  So, the most urgent thing is solving the warning
>> messages.
>>
>> Patch 1 fixes some mistakes and adds handling of CoW cases not
>> previously considered (srcmap is HOLE or UNWRITTEN).
>> Patch 2 adds the implementation of unshare for fsdax.
>>
>> With these fixes, most warning messages in dax_associate_entry() are
>> gone.  But honestly, generic/388 will randomly failed with the warning.
>> The case shutdown the xfs when fsstress is running, and do it for many
>> times.  I think the reason is that dax pages in use are not able to be
>> invalidated in time when fs is shutdown.  The next time dax page to be
>> associated, it still remains the mapping value set last time.  I'll keep
>> on solving it.
>>
>> The warning message in dax_writeback_one() can also be fixed because of
>> the dax unshare.
> 
> This cuts down the amount of test failures quite a bit, but I think
> you're still missing a piece or two -- namely the part that refuses to
> enable S_DAX mode on a reflinked file when the inode is being loaded
> from disk.  However, thank you for fixing dax.c, because that was the
> part I couldn't figure out at all. :)

I didn't include it[1] in this patchset...

[1] 
https://lore.kernel.org/linux-xfs/1663234002-17-1-git-send-email-ruansy.fnst@fujitsu.com/


--
Thanks,
Ruan.

> 
> --D
> 
>>
>> Shiyang Ruan (2):
>>    fsdax,xfs: fix warning messages at dax_[dis]associate_entry()
>>    fsdax,xfs: port unshare to fsdax
>>
>>   fs/dax.c             | 166 ++++++++++++++++++++++++++++++-------------
>>   fs/xfs/xfs_iomap.c   |   6 +-
>>   fs/xfs/xfs_reflink.c |   8 ++-
>>   include/linux/dax.h  |   2 +
>>   4 files changed, 129 insertions(+), 53 deletions(-)
>>
>> -- 
>> 2.38.1
>>