[PATCH 0/3] FF_FLAGS_NO_READ_IO

[Tom Haynes <thomas.haynes@primarydata.com>]

FF_FLAGS_NO_READ_IO is a hint the mds can use to inform the
client that an IOMODE_RW layout segment should not be used
for READ traffic and that the client should instead request
an IOMODE_READ layout segment. This can be used to isolate
only WRITE traffic onto the IOMODE_RW layout segment.

Tom Haynes (3):
  nfs/flexfiles: Helper function to detect FF_FLAGS_NO_READ_IO
  nfs/flexfiles: Use the layout segment for reading unless it a
    IOMODE_RW and reading is disabled
  pnfs: pnfs_update_layout needs to consider if strict iomode checking
    is on

 fs/nfs/filelayout/filelayout.c            |  2 ++
 fs/nfs/flexfilelayout/flexfilelayout.c    | 50 +++++++++++++++++++++++--------
 fs/nfs/flexfilelayout/flexfilelayout.h    | 10 ++++++-
 fs/nfs/flexfilelayout/flexfilelayoutdev.c |  6 ++++
 fs/nfs/pnfs.c                             | 34 +++++++++++++--------
 fs/nfs/pnfs.h                             |  1 +
 6 files changed, 77 insertions(+), 26 deletions(-)

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1.8.3.1