nfs41: sequence operation

Implement the sequence operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Check returned sessionid, slotid and slot sequenceid in decode_sequence.

If the server returns different values for sessionID, slotID or slot sequence
number than what was sent, the server is looney tunes.

Pass the sequence operation status to nfs41_sequence_done in order to
determine when to increment the slot sequence ID.

Free slot is separated from sequence done.

Signed-off-by: Rahul Iyer <iyer@netapp.com>
Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Andy Adamson<andros@umich.edu>
[nfs41: sequence res use slotid]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: deref slot table in decode_sequence only for minorversion!=0]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: nfs4_call_sync]
[nfs41: remove SEQ4_STATUS_USE_TK_STATUS]
[nfs41: return ESERVERFAULT in decode_sequence]
[no sr_session, no sr_flags]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: use nfs4_call_sync_sequence to renew session lease]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: remove nfs4_call_sync_sequence forward definition]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: use struct nfs_client for nfs41_proc_async_sequence]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: pass *session in seq_args and seq_res]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41 nfs41_sequence_call_done update error checking]
[nfs41 nfs41_sequence_done update error checking]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: remove switch on error from nfs41_sequence_call_done]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5fe208b486d4..17768095f0cc 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4567,6 +4567,98 @@ int nfs4_proc_destroy_session(struct nfs4_session *session)
         return status;
 }
 
+/*
+ * Renew the cl_session lease.
+ */
+static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
+{
+        struct nfs4_sequence_args args;
+        struct nfs4_sequence_res res;
+
+        struct rpc_message msg = {
+                .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
+                .rpc_argp = &args,
+                .rpc_resp = &res,
+                .rpc_cred = cred,
+        };
+
+        args.sa_cache_this = 0;
+
+        return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
+                                       &res, 0);
+}
+
+void nfs41_sequence_call_done(struct rpc_task *task, void *data)
+{
+        struct nfs_client *clp = (struct nfs_client *)data;
+
+        nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
+
+        if (task->tk_status < 0) {
+                dprintk("%s ERROR %d\n", __func__, task->tk_status);
+
+                if (_nfs4_async_handle_error(task, NULL, clp, NULL)
+                                                                == -EAGAIN) {
+                        rpc_restart_call(task);
+                        return;
+                }
+        }
+        nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
+        dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
+
+        put_rpccred(task->tk_msg.rpc_cred);
+        kfree(task->tk_msg.rpc_argp);
+        kfree(task->tk_msg.rpc_resp);
+
+        dprintk("<-- %s\n", __func__);
+}
+
+static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
+{
+        struct nfs_client *clp;
+        struct nfs4_sequence_args *args;
+        struct nfs4_sequence_res *res;
+
+        clp = (struct nfs_client *)data;
+        args = task->tk_msg.rpc_argp;
+        res = task->tk_msg.rpc_resp;
+
+        if (nfs4_setup_sequence(clp, args, res, 0, task))
+                return;
+        rpc_call_start(task);
+}
+
+static const struct rpc_call_ops nfs41_sequence_ops = {
+        .rpc_call_done = nfs41_sequence_call_done,
+        .rpc_call_prepare = nfs41_sequence_prepare,
+};
+
+static int nfs41_proc_async_sequence(struct nfs_client *clp,
+                                     struct rpc_cred *cred)
+{
+        struct nfs4_sequence_args *args;
+        struct nfs4_sequence_res *res;
+        struct rpc_message msg = {
+                .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
+                .rpc_cred = cred,
+        };
+
+        args = kzalloc(sizeof(*args), GFP_KERNEL);
+        if (!args)
+                return -ENOMEM;
+        res = kzalloc(sizeof(*res), GFP_KERNEL);
+        if (!res) {
+                kfree(args);
+                return -ENOMEM;
+        }
+        res->sr_slotid = NFS4_MAX_SLOT_TABLE;
+        msg.rpc_argp = args;
+        msg.rpc_resp = res;
+
+        return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
+                              &nfs41_sequence_ops, (void *)clp);
+}
+
 #endif /* CONFIG_NFS_V4_1 */
 
 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {