From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>,
"Darrick J. Wong" <djwong@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>,
Linux NVDIMM <nvdimm@lists.linux.dev>,
Linux MM <linux-mm@kvack.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Jane Chu <jane.chu@oracle.com>,
Goldwyn Rodrigues <rgoldwyn@suse.de>,
Al Viro <viro@zeniv.linux.org.uk>, <linmiaohe@huawei.com>
Subject: Re: [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink
Date: Thu, 2 Jun 2022 17:42:13 +0800 [thread overview]
Message-ID: <1007e895-a0e3-9a82-2524-bb7e8a0b6b8c@fujitsu.com> (raw)
In-Reply-To: <32f51223-c671-1dc0-e14a-8887863d9071@fujitsu.com>
Hi,
Is there any other work I should do with these two patchsets? I think
they are good for now. So... since the 5.19-rc1 is coming, could the
notify_failure() part be merged as your plan?
--
Thanks,
Ruan.
在 2022/5/12 20:27, Shiyang Ruan 写道:
>
>
> 在 2022/5/11 23:46, Dan Williams 写道:
>> On Wed, May 11, 2022 at 8:21 AM Darrick J. Wong <djwong@kernel.org>
>> wrote:
>>>
>>> Oan Tue, May 10, 2022 at 10:24:28PM -0700, Andrew Morton wrote:
>>>> On Tue, 10 May 2022 19:43:01 -0700 "Darrick J. Wong"
>>>> <djwong@kernel.org> wrote:
>>>>
>>>>> On Tue, May 10, 2022 at 07:28:53PM -0700, Andrew Morton wrote:
>>>>>> On Tue, 10 May 2022 18:55:50 -0700 Dan Williams
>>>>>> <dan.j.williams@intel.com> wrote:
>>>>>>
>>>>>>>> It'll need to be a stable branch somewhere, but I don't think it
>>>>>>>> really matters where al long as it's merged into the xfs for-next
>>>>>>>> tree so it gets filesystem test coverage...
>>>>>>>
>>>>>>> So how about let the notify_failure() bits go through -mm this
>>>>>>> cycle,
>>>>>>> if Andrew will have it, and then the reflnk work has a clean
>>>>>>> v5.19-rc1
>>>>>>> baseline to build from?
>>>>>>
>>>>>> What are we referring to here? I think a minimal thing would be the
>>>>>> memremap.h and memory-failure.c changes from
>>>>>> https://lkml.kernel.org/r/20220508143620.1775214-4-ruansy.fnst@fujitsu.com
>>>>>> ?
>>>>>>
>>>>>> Sure, I can scoot that into 5.19-rc1 if you think that's best. It
>>>>>> would probably be straining things to slip it into 5.19.
>>>>>>
>>>>>> The use of EOPNOTSUPP is a bit suspect, btw. It *sounds* like the
>>>>>> right thing, but it's a networking errno. I suppose livable with
>>>>>> if it
>>>>>> never escapes the kernel, but if it can get back to userspace then a
>>>>>> user would be justified in wondering how the heck a filesystem
>>>>>> operation generated a networking errno?
>>>>>
>>>>> <shrug> most filesystems return EOPNOTSUPP rather enthusiastically
>>>>> when
>>>>> they don't know how to do something...
>>>>
>>>> Can it propagate back to userspace?
>>>
>>> AFAICT, the new code falls back to the current (mf_generic_kill_procs)
>>> failure code if the filesystem doesn't provide a ->memory_failure
>>> function or if it returns -EOPNOSUPP. mf_generic_kill_procs can also
>>> return -EOPNOTSUPP, but all the memory_failure() callers (madvise, etc.)
>>> convert that to 0 before returning it to userspace.
>>>
>>> I suppose the weirder question is going to be what happens when madvise
>>> starts returning filesystem errors like EIO or EFSCORRUPTED when pmem
>>> loses half its brains and even the fs can't deal with it.
>>
>> Even then that notification is not in a system call context so it
>> would still result in a SIGBUS notification not a EOPNOTSUPP return
>> code. The only potential gap I see are what are the possible error
>> codes that MADV_SOFT_OFFLINE might see? The man page is silent on soft
>> offline failure codes. Shiyang, that's something to check / update if
>> necessary.
>
> According to the code around MADV_SOFT_OFFLINE, it will return -EIO when
> the backend is NVDIMM.
>
> Here is the logic:
> madvise_inject_error() {
> ...
> if (MADV_SOFT_OFFLINE) {
> ret = soft_offline_page() {
> ...
> /* Only online pages can be soft-offlined (esp., not
> ZONE_DEVICE). */
> page = pfn_to_online_page(pfn);
> if (!page) {
> put_ref_page(ref_page);
> return -EIO;
> }
> ...
> }
> } else {
> ret = memory_failure()
> }
> return ret
> }
>
>
> --
> Thanks,
> Ruan.
>
>
next prev parent reply other threads:[~2022-06-02 9:42 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-08 14:36 [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 01/07] dax: Introduce holder for dax_device Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 02/07] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 03/07] pagemap,pmem: Introduce ->memory_failure() Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 04/07] fsdax: Introduce dax_lock_mapping_entry() Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 05/07] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 06/07] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2022-05-08 14:36 ` [PATCH v14 07/07] fsdax: set a CoW flag when associate reflink mappings Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 01/07] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 02/07] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 03/07] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 04/07] fsdax: Add dax_iomap_cow_copy() for dax zero Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 05/07] fsdax: Dedup file range to use a compare function Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 06/07] xfs: support CoW in fsdax mode Shiyang Ruan
2022-05-10 5:45 ` Christoph Hellwig
2022-05-10 10:06 ` Shiyang Ruan
2022-05-11 2:25 ` [PATCH v11.1 " Shiyang Ruan
2022-05-08 14:36 ` [PATCH v11 07/07] xfs: Add dax dedupe support Shiyang Ruan
2022-05-10 9:32 ` [PATCHSETS] v14 fsdax-rmap + v11 fsdax-reflink Christoph Hellwig
2022-05-11 0:03 ` Darrick J. Wong
2022-05-11 1:48 ` Dave Chinner
2022-05-11 1:55 ` Dan Williams
2022-05-11 2:19 ` Dave Chinner
2022-05-11 2:28 ` Andrew Morton
2022-05-11 2:43 ` Darrick J. Wong
2022-05-11 5:24 ` Andrew Morton
2022-05-11 6:21 ` Dave Chinner
2022-05-11 15:19 ` Darrick J. Wong
2022-05-11 15:46 ` Dan Williams
2022-05-12 12:27 ` Shiyang Ruan
2022-06-02 9:42 ` Shiyang Ruan [this message]
2022-06-02 17:18 ` Darrick J. Wong
2022-06-02 17:47 ` Andrew Morton
2022-05-11 4:20 ` Dan Williams
2022-05-11 4:34 ` Darrick J. Wong
2022-06-02 18:56 ` Andrew Morton
2022-06-03 1:07 ` Shiyang Ruan
2022-06-03 1:36 ` Shiyang Ruan
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