xfs COW cleanups v3

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To: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
Subject: xfs COW cleanups v3
From: Christoph Hellwig <hch@xxxxxx>
Date: Sat, 19 Oct 2019 16:44:36 +0200

Hi all,

Changes since v2:
 - rebased on the latest iomap-for-next and dropped patches already
   merged

Changes since v1:
 - renumber IOMAP_HOLE to 0 and avoid the reserved 0 value
 - fix minor typos and update comments

Follow-Ups:
- Re: xfs COW cleanups v3
  - From: Darrick J. Wong
- [PATCH 12/12] xfs: improve the IOMAP_NOWAIT check for COW inodes
  - From: Christoph Hellwig
- [PATCH 11/12] xfs: cleanup xfs_direct_write_iomap_begin
  - From: Christoph Hellwig
- [PATCH 10/12] xfs: rename the whichfork variable in xfs_buffered_write_iomap_begin
  - From: Christoph Hellwig
- [PATCH 09/12] xfs: split the iomap ops for buffered vs direct writes
  - From: Christoph Hellwig
- [PATCH 08/12] xfs: move xfs_file_iomap_begin_delay around
  - From: Christoph Hellwig
- [PATCH 07/12] xfs: split out a new set of read-only iomap ops
  - From: Christoph Hellwig
- [PATCH 06/12] xfs: factor out a helper to calculate the end_fsb
  - From: Christoph Hellwig
- [PATCH 05/12] xfs: fill out the srcmap in iomap_begin
  - From: Christoph Hellwig
- [PATCH 04/12] xfs: refactor xfs_file_iomap_begin_delay
  - From: Christoph Hellwig
- [PATCH 03/12] xfs: pass two imaps to xfs_reflink_allocate_cow
  - From: Christoph Hellwig
- [PATCH 02/12] xfs: remove xfs_reflink_dirty_extents
  - From: Christoph Hellwig
- [PATCH 01/12] xfs: also call xfs_file_iomap_end_delalloc for zeroing operations
  - From: Christoph Hellwig

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