pNFS/flexfiles: When initing reads or writes, we might have to retry connecting to DSes
If we are initializing reads or writes and can not connect to a DS, then check whether or not IO is allowed through the MDS. If it is allowed, reset to the MDS. Else, fail the layout segment and force a retry of a new layout segment. Signed-off-by: NTom Haynes <loghyr@primarydata.com> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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