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

Shiyang Ruan
2021-06-04T01:19:06Z

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(-)

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2.31.1