rmacklem 4a4e3b7632 Allow use of a write open stateid for reading in the NFSv4 server.
The NFSv4 RFCs give a server the option of allowing the use of an open
stateid for write access to be used for a Read operation.
This patch enables this by default and adds a sysctl to disable it,
for anyone who does not want this capability.
Allowing this is particularily useful for a pNFS Data Server (DS), since
they are not permitted to allow the use of special stateids.
Discovered during recent testing of the pNFS server under development.

MFC after:	2 weeks
2017-04-24 20:46:19 +00:00
..
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