linux-kernel - [PATCH v4 00/10] fsdax: introduce fs query to support reflink

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Date:   Fri, 4 Jun 2021 09:18:34 +0800
From:   Shiyang Ruan <ruansy.fnst@...itsu.com>
To:     <linux-kernel@...r.kernel.org>, <linux-xfs@...r.kernel.org>,
        <linux-nvdimm@...ts.01.org>, <linux-mm@...ck.org>,
        <linux-fsdevel@...r.kernel.org>, <dm-devel@...hat.com>
CC:     <darrick.wong@...cle.com>, <dan.j.williams@...el.com>,
        <david@...morbit.com>, <hch@....de>, <agk@...hat.com>,
        <snitzer@...hat.com>, <rgoldwyn@...e.de>
Subject: [PATCH v4 00/10] fsdax: introduce fs query to support reflink

This patchset is aimed to support shared pages tracking for fsdax.

Change from V3:
  - Introduce dax_device->holder to split dax specific issues from
    block device, instead of the ->corrupted_range() in
    block_device_operations
  - Other mistakes and problems fix
  - Rebased to v5.13-rc4

This patchset moves owner tracking from dax_assocaite_entry() to pmem
device driver, by introducing an interface ->memory_failure() of struct
pagemap.  This interface is called by memory_failure() in mm, and
implemented by pmem device.

Then call holder operations to find the filesystem which the corrupted
data located in, and call filesystem handler to track files or metadata
associated with this page.

Finally we are able to try to fix the corrupted data in filesystem and
do other necessary processing, such as killing processes who are using
the files affected.

The call trace is like this:
memory_failure()
 pgmap->ops->memory_failure()      => pmem_pgmap_memory_failure()
  dax_device->holder_ops->corrupted_range() =>
                                      - fs_dax_corrupted_range()
                                      - md_dax_corrupted_range()
   sb->s_ops->currupted_range()    => xfs_fs_corrupted_range()
    xfs_rmap_query_range()
     xfs_currupt_helper()
      * corrupted on metadata
          try to recover data, call xfs_force_shutdown()
      * corrupted on file data
          try to recover data, call mf_dax_kill_procs()

The fsdax & reflink support for XFS is not contained in this patchset.

(Rebased on v5.13-rc4)
==


Shiyang Ruan (10):
  pagemap: Introduce ->memory_failure()
  dax: Introduce holder for dax_device
  fs: Introduce ->corrupted_range() for superblock
  mm, fsdax: Refactor memory-failure handler for dax mapping
  mm, pmem: Implement ->memory_failure() in pmem driver
  fs/dax: Implement dax_holder_operations
  dm: Introduce ->rmap() to find bdev offset
  md: Implement dax_holder_operations
  xfs: Implement ->corrupted_range() for XFS
  fs/dax: Remove useless functions

 block/genhd.c                 |  30 ++++++
 drivers/dax/super.c           |  38 ++++++++
 drivers/md/dm-linear.c        |  20 ++++
 drivers/md/dm.c               | 119 ++++++++++++++++++++++-
 drivers/nvdimm/pmem.c         |  14 +++
 fs/dax.c                      |  79 +++++++---------
 fs/xfs/xfs_fsops.c            |   5 +
 fs/xfs/xfs_mount.h            |   1 +
 fs/xfs/xfs_super.c            | 108 +++++++++++++++++++++
 include/linux/dax.h           |  13 +++
 include/linux/device-mapper.h |   5 +
 include/linux/fs.h            |   2 +
 include/linux/genhd.h         |   1 +
 include/linux/memremap.h      |   8 ++
 include/linux/mm.h            |   9 ++
 mm/memory-failure.c           | 173 ++++++++++++++++++++++------------
 16 files changed, 520 insertions(+), 105 deletions(-)

-- 
2.31.1