7 files changed, 112 insertions, 6 deletions

diff --git a/include/linux/sunrpc/bc_xprt.h b/include/linux/sunrpc/bc_xprt.h
new file mode 100644
index 000000000000..6508f0dc0eff
--- /dev/null
+++ b/include/linux/sunrpc/bc_xprt.h
@@ -0,0 +1,49 @@
+/******************************************************************************
+
+(c) 2008 NetApp.  All Rights Reserved.
+
+NetApp provides this source code under the GPL v2 License.
+The GPL v2 license is available at
+http://opensource.org/licenses/gpl-license.php.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+******************************************************************************/
+
+/*
+ * Functions to create and manage the backchannel
+ */
+
+#ifndef _LINUX_SUNRPC_BC_XPRT_H
+#define _LINUX_SUNRPC_BC_XPRT_H
+
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/sunrpc/sched.h>
+
+#ifdef CONFIG_NFS_V4_1
+struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);
+void xprt_free_bc_request(struct rpc_rqst *req);
+int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
+void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
+void bc_release_request(struct rpc_task *);
+int bc_send(struct rpc_rqst *req);
+#else /* CONFIG_NFS_V4_1 */
+static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
+                                         unsigned int min_reqs)
+{
+        return 0;
+}
+#endif /* CONFIG_NFS_V4_1 */
+#endif /* _LINUX_SUNRPC_BC_XPRT_H */
+
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index c39a21040dcb..37881f1a0bd7 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -143,6 +143,7 @@ int		rpc_call_sync(struct rpc_clnt *clnt,
                               const struct rpc_message *msg, int flags);
 struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
                                int flags);
+void            rpc_restart_call_prepare(struct rpc_task *);
 void            rpc_restart_call(struct rpc_task *);
 void            rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
 size_t          rpc_max_payload(struct rpc_clnt *);
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 64981a2f1cae..401097781fc0 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -210,6 +210,8 @@ struct rpc_wait_queue {
  */
 struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
 struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
+struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
+                                const struct rpc_call_ops *ops);
 void            rpc_put_task(struct rpc_task *);
 void            rpc_exit_task(struct rpc_task *);
 void            rpc_release_calldata(const struct rpc_call_ops *, void *);
@@ -237,6 +239,7 @@ void		rpc_show_tasks(void);
 int             rpc_init_mempool(void);
 void            rpc_destroy_mempool(void);
 extern struct workqueue_struct *rpciod_workqueue;
+void            rpc_prepare_task(struct rpc_task *task);
 
 static inline void rpc_exit(struct rpc_task *task, int status)
 {
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 2a30775959e9..ea8009695c69 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -96,6 +96,15 @@ struct svc_serv {
         svc_thread_fn           sv_function;    /* main function for threads */
         unsigned int            sv_drc_max_pages; /* Total pages for DRC */
         unsigned int            sv_drc_pages_used;/* DRC pages used */
+#if defined(CONFIG_NFS_V4_1)
+        struct list_head        sv_cb_list;     /* queue for callback requests
+                                                 * that arrive over the same
+                                                 * connection */
+        spinlock_t              sv_cb_lock;     /* protects the svc_cb_list */
+        wait_queue_head_t       sv_cb_waitq;    /* sleep here if there are no
+                                                 * entries in the svc_cb_list */
+        struct svc_xprt         *bc_xprt;
+#endif /* CONFIG_NFS_V4_1 */
 };
 
 /*
@@ -411,6 +420,8 @@ int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
 int                svc_pool_stats_open(struct svc_serv *serv, struct file *file);
 void               svc_destroy(struct svc_serv *);
 int                svc_process(struct svc_rqst *);
+int                bc_svc_process(struct svc_serv *, struct rpc_rqst *,
+                        struct svc_rqst *);
 int                svc_register(const struct svc_serv *, const int,
                                 const unsigned short, const unsigned short);
 
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 0d9cb6ef28b0..2223ae0b5ed5 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -83,7 +83,7 @@ int	svc_port_is_privileged(struct sockaddr *sin);
 int     svc_print_xprts(char *buf, int maxlen);
 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
                         const sa_family_t af, const unsigned short port);
-int     svc_xprt_names(struct svc_serv *serv, char *buf, int buflen);
+int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 
 static inline void svc_xprt_get(struct svc_xprt *xprt)
 {
@@ -118,7 +118,7 @@ static inline unsigned short svc_addr_port(const struct sockaddr *sa)
         return 0;
 }
 
-static inline size_t svc_addr_len(struct sockaddr *sa)
+static inline size_t svc_addr_len(const struct sockaddr *sa)
 {
         switch (sa->sa_family) {
         case AF_INET:
@@ -126,7 +126,8 @@ static inline size_t svc_addr_len(struct sockaddr *sa)
         case AF_INET6:
                 return sizeof(struct sockaddr_in6);
         }
-        return -EAFNOSUPPORT;
+
+        return 0;
 }
 
 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
index 483e10380aae..04dba23c59f2 100644
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -38,10 +38,15 @@ int		svc_recv(struct svc_rqst *, long);
 int             svc_send(struct svc_rqst *);
 void            svc_drop(struct svc_rqst *);
 void            svc_sock_update_bufs(struct svc_serv *serv);
-int             svc_sock_names(char *buf, struct svc_serv *serv, char *toclose);
-int             svc_addsock(struct svc_serv *serv, int fd, char *name_return);
+int             svc_sock_names(struct svc_serv *serv, char *buf,
+                                        const size_t buflen,
+                                        const char *toclose);
+int             svc_addsock(struct svc_serv *serv, const int fd,
+                                        char *name_return, const size_t len);
 void            svc_init_xprt_sock(void);
 void            svc_cleanup_xprt_sock(void);
+struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot);
+void            svc_sock_destroy(struct svc_xprt *);
 
 /*
  * svc_makesock socket characteristics
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 08afe43118f4..1175d58efc2e 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -67,7 +67,8 @@ struct rpc_rqst {
         struct rpc_task *       rq_task;        /* RPC task data */
         __be32                  rq_xid;         /* request XID */
         int                     rq_cong;        /* has incremented xprt->cong */
-        int                     rq_received;    /* receive completed */
+        int                     rq_reply_bytes_recvd;   /* number of reply */
+                                                        /* bytes received */
         u32                     rq_seqno;       /* gss seq no. used on req. */
         int                     rq_enc_pages_num;
         struct page             **rq_enc_pages; /* scratch pages for use by
@@ -97,6 +98,12 @@ struct rpc_rqst {
 
         unsigned long           rq_xtime;       /* when transmitted */
         int                     rq_ntrans;
+
+#if defined(CONFIG_NFS_V4_1)
+        struct list_head        rq_bc_list;     /* Callback service list */
+        unsigned long           rq_bc_pa_state; /* Backchannel prealloc state */
+        struct list_head        rq_bc_pa_list;  /* Backchannel prealloc list */
+#endif /* CONFIG_NFS_V4_1 */
 };
 #define rq_svec                 rq_snd_buf.head
 #define rq_slen                 rq_snd_buf.len
@@ -174,6 +181,15 @@ struct rpc_xprt {
         spinlock_t              reserve_lock;   /* lock slot table */
         u32                     xid;            /* Next XID value to use */
         struct rpc_task *       snd_task;       /* Task blocked in send */
+#if defined(CONFIG_NFS_V4_1)
+        struct svc_serv         *bc_serv;       /* The RPC service which will */
+                                                /* process the callback */
+        unsigned int            bc_alloc_count; /* Total number of preallocs */
+        spinlock_t              bc_pa_lock;     /* Protects the preallocated
+                                                 * items */
+        struct list_head        bc_pa_list;     /* List of preallocated
+                                                 * backchannel rpc_rqst's */
+#endif /* CONFIG_NFS_V4_1 */
         struct list_head        recv;
 
         struct {
@@ -192,6 +208,26 @@ struct rpc_xprt {
         const char              *address_strings[RPC_DISPLAY_MAX];
 };
 
+#if defined(CONFIG_NFS_V4_1)
+/*
+ * Backchannel flags
+ */
+#define RPC_BC_PA_IN_USE        0x0001          /* Preallocated backchannel */
+                                                /* buffer in use */
+#endif /* CONFIG_NFS_V4_1 */
+
+#if defined(CONFIG_NFS_V4_1)
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+        return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
+}
+#else
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+        return 0;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
 struct xprt_create {
         int                     ident;          /* XPRT_TRANSPORT identifier */
         struct sockaddr *       srcaddr;        /* optional local address */