Merge patch series "further iomap large atomic writes changes"

John Garry <john.g.garry@oracle.com> says:

These iomap changes are spun-off the XFS large atomic writes series at
https://lore.kernel.org/linux-xfs/86a64256-497a-453b-bbba-a5ac6b4cb056@oracle.com/T/#ma99c763221de9d49ea2ccfca9ff9b8d71c8b2677

The XFS parts there are not ready yet, but it is worth having the iomap
changes queued in advance.

Some much earlier changes from that same series were already queued in the
vfs tree, and these patches rework those changes - specifically the
first patch in this series does.

The most other significant change is the patch to rework how the bio flags
are set in the DIO patch.

* patches from https://lore.kernel.org/r/20250320120250.4087011-1-john.g.garry@oracle.com:
  iomap: rework IOMAP atomic flags
  iomap: comment on atomic write checks in iomap_dio_bio_iter()
  iomap: inline iomap_dio_bio_opflags()

Link: https://lore.kernel.org/r/20250320120250.4087011-1-john.g.garry@oracle.com
Signed-off-by: Christian Brauner <brauner@kernel.org>