decouple DAX from block devices

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To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: decouple DAX from block devices
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 9 Nov 2021 09:32:40 +0100
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>, Ira Weiny <ira.weiny@xxxxxxxxx>, dm-devel@xxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, nvdimm@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-erofs@xxxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx

Hi Dan,

this series decouples the DAX from the block layer so that the
block_device is not needed at all for the DAX I/O path.

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Follow-Ups:
- [PATCH 27/29] dax: fix up some of the block device related ifdefs
  - From: Christoph Hellwig
- [PATCH 29/29] fsdax: don't require CONFIG_BLOCK
  - From: Christoph Hellwig
- [PATCH 28/29] iomap: build the block based code conditionally
  - From: Christoph Hellwig
- [PATCH 26/29] fsdax: shift partition offset handling into the file systems
  - From: Christoph Hellwig
- [PATCH 23/29] xfs: use IOMAP_DAX to check for DAX mappings
  - From: Christoph Hellwig
- [PATCH 25/29] dax: return the partition offset from fs_dax_get_by_bdev
  - From: Christoph Hellwig
- [PATCH 24/29] xfs: use xfs_direct_write_iomap_ops for DAX zeroing
  - From: Christoph Hellwig
- [PATCH 20/29] ext4: cleanup the dax handling in ext4_fill_super
  - From: Christoph Hellwig
- [PATCH 22/29] iomap: add a IOMAP_DAX flag
  - From: Christoph Hellwig
- [PATCH 19/29] ext2: cleanup the dax handling in ext2_fill_super
  - From: Christoph Hellwig
- [PATCH 17/29] fsdax: factor out a dax_memzero helper
  - From: Christoph Hellwig
- [PATCH 21/29] xfs: move dax device handling into xfs_{alloc,free}_buftarg
  - From: Christoph Hellwig
- [PATCH 18/29] fsdax: decouple zeroing from the iomap buffered I/O code
  - From: Christoph Hellwig
- [PATCH 15/29] xfs: add xfs_zero_range and xfs_truncate_page helpers
  - From: Christoph Hellwig
- [PATCH 14/29] fsdax: simplify the pgoff calculation
  - From: Christoph Hellwig
- [PATCH 16/29] fsdax: simplify the offset check in dax_iomap_zero
  - From: Christoph Hellwig
- [PATCH 12/29] fsdax: remove a pointless __force cast in copy_cow_page_dax
  - From: Christoph Hellwig
- [PATCH 11/29] dm-stripe: add a stripe_dax_pgoff helper
  - From: Christoph Hellwig
- [PATCH 13/29] fsdax: use a saner calling convention for copy_cow_page_dax
  - From: Christoph Hellwig
- [PATCH 10/29] dm-log-writes: add a log_writes_dax_pgoff helper
  - From: Christoph Hellwig
- [PATCH 09/29] dm-linear: add a linear_dax_pgoff helper
  - From: Christoph Hellwig
- [PATCH 07/29] xfs: factor out a xfs_setup_dax_always helper
  - From: Christoph Hellwig
- [PATCH 08/29] dax: remove dax_capable
  - From: Christoph Hellwig
- [PATCH 05/29] dax: remove the pgmap sanity checks in generic_fsdax_supported
  - From: Christoph Hellwig
- [PATCH 06/29] dax: move the partition alignment check into fs_dax_get_by_bdev
  - From: Christoph Hellwig
- [PATCH 04/29] dax: simplify the dax_device <-> gendisk association
  - From: Christoph Hellwig
- [PATCH 02/29] dm: make the DAX support dependend on CONFIG_FS_DAX
  - From: Christoph Hellwig
- [PATCH 03/29] dax: remove CONFIG_DAX_DRIVER
  - From: Christoph Hellwig
- [PATCH 01/29] nvdimm/pmem: move dax_attribute_group from dax to pmem
  - From: Christoph Hellwig

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