NFSv4: Ensure that we remove NFSv4.0 delegations when state has expired

NFSv4.0 does not have TEST_STATEID/FREE_STATEID functionality, so
unlike NFSv4.1, the recovery procedure when stateids have expired or
have been revoked requires us to just forget the delegation.

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>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index dca174c..bdd880b 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2109,6 +2109,28 @@ static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *sta
        return ret;
 }
 
+static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
+{
+       nfs_remove_bad_delegation(state->inode);
+       write_seqlock(&state->seqlock);
+       nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+       write_sequnlock(&state->seqlock);
+       clear_bit(NFS_DELEGATED_STATE, &state->flags);
+}
+
+static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
+{
+       if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
+               nfs_finish_clear_delegation_stateid(state);
+}
+
+static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+       /* NFSv4.0 doesn't allow for delegation recovery on open expire */
+       nfs40_clear_delegation_stateid(state);
+       return nfs4_open_expired(sp, state);
+}
+
 #if defined(CONFIG_NFS_V4_1)
 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
 {
@@ -8330,7 +8352,7 @@ static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
        .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
        .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
-       .recover_open   = nfs4_open_expired,
+       .recover_open   = nfs40_open_expired,
        .recover_lock   = nfs4_lock_expired,
        .establish_clid = nfs4_init_clientid,
 };