Merge tag 'vfs-6.15-rc1.iomap' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Merge tag 'vfs-6.15-rc1.iomap' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs iomap updates from Christian Brauner:

 - Allow the filesystem to submit the writeback bios.

    - Allow the filsystem to track completions on a per-bio bases
      instead of the entire I/O.

    - Change writeback_ops so that ->submit_bio can be done by the
      filesystem.

    - A new ANON_WRITE flag for writes that don't have a block number
      assigned to them at the iomap level leaving the filesystem to do
      that work in the submission handler.

 - Incremental iterator advance

   The folio_batch support for zero range where the filesystem provides
   a batch of folios to process that might not be logically continguous
   requires more flexibility than the current offset based iteration
   currently offers.

   Update all iomap operations to advance the iterator within the
   operation and thus remove the need to advance from the core iomap
   iterator.

 - Make buffered writes work with RWF_DONTCACHE

   If RWF_DONTCACHE is set for a write, mark the folios being written as
   uncached. On writeback completion the pages will be dropped.

 - Introduce infrastructure for large atomic writes

   This will eventually be used by xfs and ext4.

* tag 'vfs-6.15-rc1.iomap' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (42 commits)
  iomap: rework IOMAP atomic flags
  iomap: comment on atomic write checks in iomap_dio_bio_iter()
  iomap: inline iomap_dio_bio_opflags()
  iomap: fix inline data on buffered read
  iomap: Lift blocksize restriction on atomic writes
  iomap: Support SW-based atomic writes
  iomap: Rename IOMAP_ATOMIC -> IOMAP_ATOMIC_HW
  xfs: flag as supporting FOP_DONTCACHE
  iomap: make buffered writes work with RWF_DONTCACHE
  iomap: introduce a full map advance helper
  iomap: rename iomap_iter processed field to status
  iomap: remove unnecessary advance from iomap_iter()
  dax: advance the iomap_iter on pte and pmd faults
  dax: advance the iomap_iter on dedupe range
  dax: advance the iomap_iter on unshare range
  dax: advance the iomap_iter on zero range
  dax: push advance down into dax_iomap_iter() for read and write
  dax: advance the iomap_iter in the read/write path
  iomap: convert misc simple ops to incremental advance
  iomap: advance the iter on direct I/O
  ...