nfsd4: generic callback code

Make the recall callback code more generic, so that other callbacks
will be able to use it too.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 5508e92..a037f26 100644 (file)
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -585,7 +585,6 @@ void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
 static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
                struct rpc_task *task)
 {
-       struct nfsd4_cb_args *args = task->tk_msg.rpc_argp;
        u32 *ptr = (u32 *)clp->cl_sessionid.data;
        int status = 0;
 
@@ -598,14 +597,6 @@ static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
                status = -EAGAIN;
                goto out;
        }
-
-       /*
-        * We'll need the clp during XDR encoding and decoding,
-        * and the sequence during decoding to verify the reply
-        */
-       args->args_clp = clp;
-       task->tk_msg.rpc_resp = args;
-
 out:
        dprintk("%s status=%d\n", __func__, status);
        return status;
@@ -617,7 +608,8 @@ out:
  */
 static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
 {
-       struct nfs4_delegation *dp = calldata;
+       struct nfsd4_callback *cb = calldata;
+       struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
        struct nfs4_client *clp = dp->dl_client;
        struct nfsd4_cb_args *args = task->tk_msg.rpc_argp;
        u32 minorversion = clp->cl_cb_conn.cb_minorversion;
@@ -640,7 +632,8 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
 
 static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
 {
-       struct nfs4_delegation *dp = calldata;
+       struct nfsd4_callback *cb = calldata;
+       struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
        struct nfs4_client *clp = dp->dl_client;
 
        dprintk("%s: minorversion=%d\n", __func__,
@@ -662,7 +655,8 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
 
 static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
 {
-       struct nfs4_delegation *dp = calldata;
+       struct nfsd4_callback *cb = calldata;
+       struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
        struct nfs4_client *clp = dp->dl_client;
        struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
 
@@ -707,7 +701,8 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
 
 static void nfsd4_cb_recall_release(void *calldata)
 {
-       struct nfs4_delegation *dp = calldata;
+       struct nfsd4_callback *cb = calldata;
+       struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
 
        nfs4_put_delegation(dp);
 }
@@ -749,42 +744,39 @@ void nfsd4_set_callback_client(struct nfs4_client *clp, struct rpc_clnt *new)
                rpc_shutdown_client(old);
 }
 
-/*
- * called with dp->dl_count inc'ed.
- */
-static void _nfsd4_cb_recall(struct nfs4_delegation *dp)
+void nfsd4_release_cb(struct nfsd4_callback *cb)
 {
-       struct nfs4_client *clp = dp->dl_client;
+       if (cb->cb_ops->rpc_release)
+               cb->cb_ops->rpc_release(cb);
+}
+
+void nfsd4_do_callback_rpc(struct work_struct *w)
+{
+       struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
+       struct nfs4_client *clp = cb->cb_args.args_clp;
        struct rpc_clnt *clnt = clp->cl_cb_client;
-       struct nfsd4_cb_args *args = &dp->dl_recall.cb_args;
-       struct rpc_message msg = {
-               .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
-               .rpc_cred = callback_cred
-       };
 
        if (clnt == NULL) {
-               nfs4_put_delegation(dp);
+               nfsd4_release_cb(cb);
                return; /* Client is shutting down; give up. */
        }
-
-       args->args_op = dp;
-       msg.rpc_argp = args;
-       dp->dl_retries = 1;
-       rpc_call_async(clnt, &msg, RPC_TASK_SOFT, &nfsd4_cb_recall_ops, dp);
+       rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT, cb->cb_ops, cb);
 }
 
-void nfsd4_do_callback_rpc(struct work_struct *w)
+void nfsd4_cb_recall(struct nfs4_delegation *dp)
 {
-       /* XXX: for now, just send off delegation recall. */
-       /* In future, generalize to handle any sort of callback. */
-       struct nfsd4_callback *c = container_of(w, struct nfsd4_callback, cb_work);
-       struct nfs4_delegation *dp = container_of(c, struct nfs4_delegation, dl_recall);
-
-       _nfsd4_cb_recall(dp);
-}
+       struct nfsd4_callback *cb = &dp->dl_recall;
 
+       dp->dl_retries = 1;
+       cb->cb_args.args_op = dp;
+       cb->cb_args.args_clp = dp->dl_client;
+       cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL];
+       cb->cb_msg.rpc_argp = &cb->cb_args;
+       cb->cb_msg.rpc_resp = &cb->cb_args;
+       cb->cb_msg.rpc_cred = callback_cred;
+
+       cb->cb_ops = &nfsd4_cb_recall_ops;
+       dp->dl_retries = 1;
 
-void nfsd4_cb_recall(struct nfs4_delegation *dp)
-{
        queue_work(callback_wq, &dp->dl_recall.cb_work);
 }

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index f988b90..6e59214 100644 (file)
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -72,6 +72,8 @@ struct nfsd4_cb_args {
 
 struct nfsd4_callback {
        struct nfsd4_cb_args cb_args;
+       struct rpc_message cb_msg;
+       const struct rpc_call_ops *cb_ops;
        struct work_struct cb_work;
 };