NFSv4.1: nfs41_clear_delegation_stateid shouldn't trust NFS_DELEGATED_STATE
authorTrond Myklebust <trond.myklebust@primarydata.com>
Wed, 12 Nov 2014 19:44:49 +0000 (14:44 -0500)
committerTrond Myklebust <trond.myklebust@primarydata.com>
Wed, 12 Nov 2014 22:01:33 +0000 (17:01 -0500)
commit0c116cadd94b16b30b1dd90d38b2784d9b39b01a
tree05de2078e0257bead5b569bf03f6dcaad234760d
parent4dfd4f7af0afd201706ad186352ca423b0f17d4b
NFSv4.1: nfs41_clear_delegation_stateid shouldn't trust NFS_DELEGATED_STATE

This patch removes the assumption made previously, that we only need to
check the delegation stateid when it matches the stateid on a cached
open.

If we believe that we hold a delegation for this file, then we must assume
that its stateid may have been revoked or expired too. If we don't test it
then our state recovery process may end up caching open/lock state in a
situation where it should not.
We therefore rename the function nfs41_clear_delegation_stateid as
nfs41_check_delegation_stateid, and change it to always run through the
delegation stateid test and recovery process as outlined in RFC5661.

http://lkml.kernel.org/r/CAN-5tyHwG=Cn2Q9KsHWadewjpTTy_K26ee+UnSvHvG4192p-Xw@mail.gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
fs/nfs/nfs4proc.c