nfs41: check SEQUENCE status flag

the server can indicate a number of error conditions by setting the
appropriate bits in the SEQUENCE operation. The client re-establishes
state with the server when it receives one of those, with the action
depending on the specific case.

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

4 files changed, 27 insertions, 2 deletions

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 0d25a82451d9..9a866368896a 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -270,6 +270,7 @@ extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 extern void nfs4_schedule_state_recovery(struct nfs_client *);
 extern void nfs4_schedule_state_manager(struct nfs_client *);
 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state);
+extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d897b9e34f12..71993f122214 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -405,6 +405,8 @@ static void nfs41_sequence_done(struct nfs_client *clp,
                 if (time_before(clp->cl_last_renewal, timestamp))
                         clp->cl_last_renewal = timestamp;
                 spin_unlock(&clp->cl_lock);
+                /* Check sequence flags */
+                nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
                 return;
         }
 out:
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 46c69e2248e3..a86f3acf3212 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1173,6 +1173,28 @@ static int nfs4_reclaim_lease(struct nfs_client *clp)
 }
 
 #ifdef CONFIG_NFS_V4_1
+void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
+{
+        if (!flags)
+                return;
+        else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) {
+                set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                nfs4_state_start_reclaim_reboot(clp);
+                nfs4_schedule_state_recovery(clp);
+        } else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
+                            SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
+                            SEQ4_STATUS_ADMIN_STATE_REVOKED |
+                            SEQ4_STATUS_RECALLABLE_STATE_REVOKED |
+                            SEQ4_STATUS_LEASE_MOVED)) {
+                set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+                nfs4_state_start_reclaim_nograce(clp);
+                nfs4_schedule_state_recovery(clp);
+        } else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
+                            SEQ4_STATUS_BACKCHANNEL_FAULT |
+                            SEQ4_STATUS_CB_PATH_DOWN_SESSION))
+                nfs_expire_all_delegations(clp);
+}
+
 static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
 {
         switch (err) {
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 4ddd04a1113e..f740472370aa 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4614,8 +4614,8 @@ static int decode_sequence(struct xdr_stream *xdr,
         dummy = be32_to_cpup(p++);
         /* target highest slot id - currently not processed */
         dummy = be32_to_cpup(p++);
-        /* result flags - currently not processed */
-        dummy = be32_to_cpup(p);
+        /* result flags */
+        res->sr_status_flags = be32_to_cpup(p);
         status = 0;
 out_err:
         res->sr_status = status;