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From: Dan Williams <dan.j.williams@intel.com>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: 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>,
	 device-mapper development <dm-devel@redhat.com>,
	"Darrick J. Wong" <djwong@kernel.org>,
	david <david@fromorbit.com>,  Christoph Hellwig <hch@lst.de>,
	Alasdair Kergon <agk@redhat.com>,
	Mike Snitzer <snitzer@redhat.com>
Subject: Re: [PATCH RESEND v6 6/9] xfs: Implement ->notify_failure() for XFS
Date: Fri, 20 Aug 2021 15:59:02 -0700	[thread overview]
Message-ID: <CAPcyv4h8eUKYDz+KLzXeMTEKc03k=8juXtYjYj+XSVQ5ww=KyQ@mail.gmail.com> (raw)
In-Reply-To: <20210730100158.3117319-7-ruansy.fnst@fujitsu.com>

On Fri, Jul 30, 2021 at 3:02 AM Shiyang Ruan <ruansy.fnst@fujitsu.com> wrote:
>
> This function is used to handle errors which may cause data lost in
> filesystem.  Such as memory failure in fsdax mode.
>
> If the rmap feature of XFS enabled, we can query it to find files and
> metadata which are associated with the corrupt data.  For now all we do
> is kill processes with that file mapped into their address spaces, but
> future patches could actually do something about corrupt metadata.
>
> After that, the memory failure needs to notify the processes who are
> using those files.
>
> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
> ---
>  drivers/dax/super.c |  12 ++++
>  fs/xfs/xfs_fsops.c  |   5 ++
>  fs/xfs/xfs_mount.h  |   1 +
>  fs/xfs/xfs_super.c  | 135 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/dax.h |  13 +++++
>  5 files changed, 166 insertions(+)
>
> diff --git a/drivers/dax/super.c b/drivers/dax/super.c
> index 00c32dfa5665..63f7b63d078d 100644
> --- a/drivers/dax/super.c
> +++ b/drivers/dax/super.c
> @@ -65,6 +65,18 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
>         return dax_get_by_host(bdev->bd_disk->disk_name);
>  }
>  EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
> +
> +void fs_dax_set_holder(struct dax_device *dax_dev, void *holder,
> +               const struct dax_holder_operations *ops)
> +{
> +       dax_set_holder(dax_dev, holder, ops);
> +}
> +EXPORT_SYMBOL_GPL(fs_dax_set_holder);

Small style issue, I'd prefer a pair of functions:

fs_dax_register_holder(struct dax_device *dax_dev, void *holder, const
struct dax_holder_operations *ops)
fs_dax_unregister_holder(struct dax_device *dax_dev)

...rather than open coding unregister as a special set that passes
NULL arguments.

> +void *fs_dax_get_holder(struct dax_device *dax_dev)
> +{
> +       return dax_get_holder(dax_dev);

Does dax_get_holder() have a lockdep_assert to check that the caller
has at least a read_lock? Please add kernel-doc for this api to
indicate the locking context expectations.

The rest of this looks plausibly ok to me, but it would be up to xfs
folks to comment on the details. I'm not entirely comfortable with
these handlers assuming DAX, i.e. they should also one day be useful
for page cache memory failure notifications, but that support can come
later.


  parent reply	other threads:[~2021-08-20 22:59 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 10:01 [PATCH RESEND v6 0/9] fsdax: introduce fs query to support reflink Shiyang Ruan
2021-07-30 10:01 ` [PATCH RESEND v6 1/9] pagemap: Introduce ->memory_failure() Shiyang Ruan
2021-08-06  1:17   ` Jane Chu
2021-08-16 17:20     ` Jane Chu
2021-08-17  1:44       ` ruansy.fnst
2021-08-18  5:43       ` Jane Chu
2021-08-18  6:08         ` Jane Chu
2021-08-18  7:52           ` ruansy.fnst
2021-08-18 17:10             ` Dan Williams
2021-08-23 13:21               ` hch
2021-08-18 15:52           ` Darrick J. Wong
2021-08-19  7:18           ` Jane Chu
2021-08-19  8:11             ` Jane Chu
2021-08-19  9:10               ` ruansy.fnst
2021-08-19 20:50                 ` Jane Chu
2021-08-20 16:07   ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device Shiyang Ruan
2021-08-06  1:02   ` Jane Chu
2021-08-17  1:45     ` ruansy.fnst
2021-08-20 16:06   ` Dan Williams
2021-08-20 20:19   ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 3/9] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2021-08-06  1:00   ` Jane Chu
2021-08-20 16:54     ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 4/9] pmem,mm: Implement ->memory_failure in pmem driver Shiyang Ruan
2021-08-20 20:51   ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 5/9] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2021-08-06  0:59   ` Jane Chu
2021-08-20 22:40   ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 6/9] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2021-08-06  0:50   ` Jane Chu
2021-08-20 22:56     ` Dan Williams
2021-08-20 22:59   ` Dan Williams [this message]
2021-07-30 10:01 ` [PATCH RESEND v6 7/9] dm: Introduce ->rmap() to find bdev offset Shiyang Ruan
2021-08-20 23:46   ` Dan Williams
2021-07-30 10:01 ` [PATCH RESEND v6 8/9] md: Implement dax_holder_operations Shiyang Ruan
2021-08-06  0:48   ` Jane Chu
2021-08-17  1:59     ` ruansy.fnst
2021-07-30 10:01 ` [PATCH RESEND v6 9/9] fsdax: add exception for reflinked files Shiyang Ruan
2021-08-06  0:46   ` Jane Chu

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