[PATCH v2 0/4] NFSD DIRECT: add handling for misaligned WRITEs

[Mike Snitzer <snitzer@xxxxxxxxxx>]

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 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            | 188 ++++++++++++++++++++++++++++++++-------
 include/linux/exportfs.h |  13 +++
 5 files changed, 220 insertions(+), 47 deletions(-)

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2.44.0