[PATCH v3 0/4] NFSD DIRECT: add handling for misaligned WRITEs

[Mike Snitzer <snitzer@kernel.org>]

Hi,

This series builds on what has been staged in the nfsd-testing branch.

This code has proven to work well during my testing.  Any suggestions
for further refinement are welcome.

Changes since v2:
- fixed patch 2 by moving redundant work out of nfsd_vfs_write()'s for
  loop, thanks to Jeff's review.
- added Jeff's Reviewed-by to patches 1-3.
- Left patch 4 in the series because it is pragmatic, but feel free to
  drop it if you'd prefer to see this cat skinned a different way.

Changes since v1:
- switched to using an EVENT_CLASS to create nfsd_analyze_{read,write}_dio
- added 4th patch, if user configured use of NFSD_IO_DIRECT then NFS
  reexports should use it too (in future, with per-export controls
  we'll have the benefit of finer-grained control; but until then we'd
  do well to offer comprehensive use of NFSD_IO_DIRECT if it enabled).

Thanks,
Mike

Mike Snitzer (4):
  NFSD: refactor nfsd_read_vector_dio to EVENT_CLASS useful for READ and WRITE
  NFSD: prepare nfsd_vfs_write() to use O_DIRECT on misaligned WRITEs
  NFSD: issue WRITEs using O_DIRECT even if IO is misaligned
  NFSD: handle unaligned DIO for NFS reexport

 fs/nfs/export.c          |   3 +-
 fs/nfsd/filecache.c      |  11 +++
 fs/nfsd/trace.h          |  52 ++++++++---
 fs/nfsd/vfs.c            | 183 ++++++++++++++++++++++++++++++++-------
 include/linux/exportfs.h |  13 +++
 5 files changed, 217 insertions(+), 45 deletions(-)

-- 
2.44.0