[PATCH 0/2] NFSv4/flexfiles: fix unwanted in-band IO fallback from DS to MDS

If FF_FLAGS_NO_IO_THRU_MDS flag is set then NFSv4 flexfiles should
never fallback to trying to issue IO directly to the MDS.

These patches fix 2 locations where FF_FLAGS_NO_IO_THRU_MDS should
inform the flexfiles client's behavior but it isn't considered.

A Hammerspace test that caused the time between layout return and get
to be much longer widened exposure for unwanted in-band IO to be
issued by flexfiles. The test allowed for these fixes to be developed
and the test now passes.

All review appreciated.

Thanks,
Mike

Mike Snitzer (2):
  NFSv4/flexfiles: honor FF_FLAGS_NO_IO_THRU_MDS on fatal DS connect errors
  NFSv4/flexfiles: honor FF_FLAGS_NO_IO_THRU_MDS in pg_get_mirror_count_write

 fs/nfs/flexfilelayout/flexfilelayout.c | 29 ++++++++++++++++++++++++++
 fs/nfs/flexfilelayout/flexfilelayout.h | 16 ++++++++++++++
 2 files changed, 45 insertions(+)

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2.44.0