[PATCH v6 0/7] NFS DIRECT: align misaligned DIO for LOCALIO

Hi,

NFS and LOCALIO in particular benefit from avoiding the page cache for
workloads that have a working set that is significantly larger than
available system memory. Enter: NFS DIRECT, which makes it possible to
always enable LOCALIO to use O_DIRECT even if the IO is not
DIO-aligned.

Changes since v5:
- I split the NFS changes back out for v6 since the NFSD DIRECT
  changes have started to land in nfsd-testing
- With the benefit of having updated the NFSD trace points to use an
  EVENT_CLASS I have now updated NFS's equivalents to also use one.
- Updated patch headers.
- Patches 4 and 5, while not strictly needed, are "nice to have"
  because they evolve the NFS LOCALIO code to a better place.

All review appreciated, thanks.
Mike

Mike Snitzer (7):
  nfs/localio: avoid bouncing LOCALIO if nfs_client_is_local()
  nfs/localio: make trace_nfs_local_open_fh more useful
  nfs/localio: add nfsd_file_dio_alignment
  nfs/localio: refactor iocb initialization
  nfs/localio: fallback to NFSD for misaligned O_DIRECT READs
  nfs/direct: add misaligned READ handling
  nfs/direct: add misaligned WRITE handling

 fs/nfs/direct.c            | 258 ++++++++++++++++++++++++++++++++++---
 fs/nfs/internal.h          |  17 ++-
 fs/nfs/localio.c           | 230 +++++++++++++++++++++------------
 fs/nfs/nfstrace.h          |  64 ++++++++-
 fs/nfs/pagelist.c          |  22 +++-
 fs/nfsd/localio.c          |  11 ++
 include/linux/nfs_page.h   |   1 +
 include/linux/nfslocalio.h |   2 +
 8 files changed, 496 insertions(+), 109 deletions(-)

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2.44.0