tree 34ebc00c001cddc94866936c460547d311e5dabb
parent cdd4e68b5f0ed12c64b3e2be83655d2a47588a74
author Trond Myklebust <Trond.Myklebust@netapp.com> 1136278513 +0100
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1136577523 -0500

NFSv4: Make nfs4_state track O_RDWR, O_RDONLY and O_WRONLY separately

 A closer reading of RFC3530 reveals that OPEN_DOWNGRADE must always
 specify a access modes that have been the argument of a previous OPEN
 operation.
 IOW: doing OPEN(O_RDWR) and then OPEN_DOWNGRADE(O_WRONLY) is forbidden
 unless the user called OPEN(O_WRONLY)

 In order to fix that, we really need to track the three possible open
 states separately.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>