pnfs: pnfs_update_layout needs to consider if strict iomode checking is on
As flexfiles has FF_FLAGS_NO_READ_IO, there is a need to generically support enforcing that a IOMODE_RW segment will not allow READ I/O. Signed-off-by: NTom Haynes <loghyr@primarydata.com> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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