9p: create transport rpc cut-thru

Add a new transport function which allows a cut-thru directly to
the transport instead of processing request through the mux if the
cut-thru exists.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

2 files changed, 35 insertions, 16 deletions

diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h
index 9dd4a05619a8..adbcafe99177 100644
--- a/include/net/9p/transport.h
+++ b/include/net/9p/transport.h
@@ -39,6 +39,8 @@ struct p9_trans {
         int (*read) (struct p9_trans *, void *, int);
         void (*close) (struct p9_trans *);
         unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *);
+        int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
+                                                        struct p9_fcall **rc);
 };
 
 struct p9_trans_module {
diff --git a/net/9p/client.c b/net/9p/client.c
index 069d9aa14205..b0d08c2375d0 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -39,6 +39,23 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt);
 static void p9_fid_destroy(struct p9_fid *fid);
 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
 
+/**
+ * p9_client_rpc - sends 9P request and waits until a response is available.
+ *      The function can be interrupted.
+ * @c: client data
+ * @tc: request to be sent
+ * @rc: pointer where a pointer to the response is stored
+ */
+int
+p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
+        struct p9_fcall **rc)
+{
+        if (c->trans->rpc)
+                return c->trans->rpc(c->trans, tc, rc);
+        else
+                return p9_conn_rpc(c->conn, tc, rc);
+}
+
 struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
                                                                    int dotu)
 {
@@ -82,7 +99,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
                 goto error;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto error;
 
@@ -174,7 +191,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
                 goto error;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto error;
 
@@ -219,7 +236,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
                 goto error;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto error;
 
@@ -270,7 +287,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
                 goto error;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err) {
                 if (rc && rc->id == P9_RWALK)
                         goto clunk_fid;
@@ -305,7 +322,7 @@ clunk_fid:
                 goto error;
         }
 
-        p9_conn_rpc(clnt->conn, tc, &rc);
+        p9_client_rpc(clnt->conn, tc, &rc);
 
 error:
         kfree(tc);
@@ -339,7 +356,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
                 goto done;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto done;
 
@@ -378,7 +395,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
                 goto done;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto done;
 
@@ -411,7 +428,7 @@ int p9_client_clunk(struct p9_fid *fid)
                 goto done;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto done;
 
@@ -443,7 +460,7 @@ int p9_client_remove(struct p9_fid *fid)
                 goto done;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto done;
 
@@ -485,7 +502,7 @@ int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
                         goto error;
                 }
 
-                err = p9_conn_rpc(clnt->conn, tc, &rc);
+                err = p9_client_rpc(clnt->conn, tc, &rc);
                 if (err)
                         goto error;
 
@@ -542,7 +559,7 @@ int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
                         goto error;
                 }
 
-                err = p9_conn_rpc(clnt->conn, tc, &rc);
+                err = p9_client_rpc(clnt->conn, tc, &rc);
                 if (err)
                         goto error;
 
@@ -596,7 +613,7 @@ p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
                         goto error;
                 }
 
-                err = p9_conn_rpc(clnt->conn, tc, &rc);
+                err = p9_client_rpc(clnt->conn, tc, &rc);
                 if (err)
                         goto error;
 
@@ -660,7 +677,7 @@ p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
                         goto error;
                 }
 
-                err = p9_conn_rpc(clnt->conn, tc, &rc);
+                err = p9_client_rpc(clnt->conn, tc, &rc);
                 if (err)
                         goto error;
 
@@ -731,7 +748,7 @@ struct p9_stat *p9_client_stat(struct p9_fid *fid)
                 goto error;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
         if (err)
                 goto error;
 
@@ -773,7 +790,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
                 goto done;
         }
 
-        err = p9_conn_rpc(clnt->conn, tc, &rc);
+        err = p9_client_rpc(clnt->conn, tc, &rc);
 
 done:
         kfree(tc);
@@ -830,7 +847,7 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
                                 goto error;
                         }
 
-                        err = p9_conn_rpc(clnt->conn, tc, &rc);
+                        err = p9_client_rpc(clnt->conn, tc, &rc);
                         if (err)
                                 goto error;