Merge commit 'linux-pnfs/nfs41-for-2.6.31' into nfsv41-for-2.6.31

10 files changed, 358 insertions, 3 deletions

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index e3f0cbcbd0db..bd2eba530667 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -21,6 +21,7 @@
 #define NFS4_FHSIZE             128
 #define NFS4_MAXPATHLEN         PATH_MAX
 #define NFS4_MAXNAMLEN          NAME_MAX
+#define NFS4_OPAQUE_LIMIT       1024
 #define NFS4_MAX_SESSIONID_LEN  16
 
 #define NFS4_ACCESS_READ        0x0001
@@ -130,6 +131,16 @@
 
 #define NFS4_MAX_UINT64 (~(u64)0)
 
+/* An NFS4 sessions server must support at least NFS4_MAX_OPS operations.
+ * If a compound requires more operations, adjust NFS4_MAX_OPS accordingly.
+ */
+#define NFS4_MAX_OPS   8
+
+/* Our NFS4 client back channel server only wants the cb_sequene and the
+ * actual operation per compound
+ */
+#define NFS4_MAX_BACK_CHANNEL_OPS 2
+
 enum nfs4_acl_whotype {
         NFS4_ACL_WHO_NAMED = 0,
         NFS4_ACL_WHO_OWNER,
@@ -462,6 +473,13 @@ enum lock_type4 {
 #define NFSPROC4_NULL 0
 #define NFSPROC4_COMPOUND 1
 #define NFS4_MINOR_VERSION 0
+
+#if defined(CONFIG_NFS_V4_1)
+#define NFS4_MAX_MINOR_VERSION 1
+#else
+#define NFS4_MAX_MINOR_VERSION 0
+#endif /* CONFIG_NFS_V4_1 */
+
 #define NFS4_DEBUG 1
 
 /* Index of predefined Linux client operations */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 6ad75948cbf7..19fe15d12042 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -4,11 +4,17 @@
 #include <linux/list.h>
 #include <linux/backing-dev.h>
 #include <linux/wait.h>
+#include <linux/nfs_xdr.h>
+#include <linux/sunrpc/xprt.h>
 
 #include <asm/atomic.h>
 
+struct nfs4_session;
 struct nfs_iostats;
 struct nlm_host;
+struct nfs4_sequence_args;
+struct nfs4_sequence_res;
+struct nfs_server;
 
 /*
  * The nfs_client identifies our client state to the server.
@@ -18,6 +24,7 @@ struct nfs_client {
         int                     cl_cons_state;  /* current construction state (-ve: init error) */
 #define NFS_CS_READY            0               /* ready to be used */
 #define NFS_CS_INITING          1               /* busy initialising */
+#define NFS_CS_SESSION_INITING  2               /* busy initialising  session */
         unsigned long           cl_res_state;   /* NFS resources state */
 #define NFS_CS_CALLBACK         1               /* - callback started */
 #define NFS_CS_IDMAP            2               /* - idmap started */
@@ -32,6 +39,7 @@ struct nfs_client {
         const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
         int                     cl_proto;       /* Network transport protocol */
 
+        u32                     cl_minorversion;/* NFSv4 minorversion */
         struct rpc_cred         *cl_machine_cred;
 
 #ifdef CONFIG_NFS_V4
@@ -63,7 +71,22 @@ struct nfs_client {
          */
         char                    cl_ipaddr[48];
         unsigned char           cl_id_uniquifier;
-#endif
+        int                  (* cl_call_sync)(struct nfs_server *server,
+                                              struct rpc_message *msg,
+                                              struct nfs4_sequence_args *args,
+                                              struct nfs4_sequence_res *res,
+                                              int cache_reply);
+#endif /* CONFIG_NFS_V4 */
+
+#ifdef CONFIG_NFS_V4_1
+        /* clientid returned from EXCHANGE_ID, used by session operations */
+        u64                     cl_ex_clid;
+        /* The sequence id to use for the next CREATE_SESSION */
+        u32                     cl_seqid;
+        /* The flags used for obtaining the clientid during EXCHANGE_ID */
+        u32                     cl_exchange_flags;
+        struct nfs4_session     *cl_session;    /* sharred session */
+#endif /* CONFIG_NFS_V4_1 */
 
 #ifdef CONFIG_NFS_FSCACHE
         struct fscache_cookie   *fscache;       /* client index cache cookie */
@@ -145,4 +168,46 @@ struct nfs_server {
 #define NFS_CAP_ACLS            (1U << 3)
 #define NFS_CAP_ATOMIC_OPEN     (1U << 4)
 
+
+/* maximum number of slots to use */
+#define NFS4_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE
+
+#if defined(CONFIG_NFS_V4_1)
+
+/* Sessions */
+#define SLOT_TABLE_SZ (NFS4_MAX_SLOT_TABLE/(8*sizeof(long)))
+struct nfs4_slot_table {
+        struct nfs4_slot *slots;                /* seqid per slot */
+        unsigned long   used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
+        spinlock_t      slot_tbl_lock;
+        struct rpc_wait_queue   slot_tbl_waitq; /* allocators may wait here */
+        int             max_slots;              /* # slots in table */
+        int             highest_used_slotid;    /* sent to server on each SEQ.
+                                                 * op for dynamic resizing */
+};
+
+static inline int slot_idx(struct nfs4_slot_table *tbl, struct nfs4_slot *sp)
+{
+        return sp - tbl->slots;
+}
+
+/*
+ * Session related parameters
+ */
+struct nfs4_session {
+        struct nfs4_sessionid           sess_id;
+        u32                             flags;
+        unsigned long                   session_state;
+        u32                             hash_alg;
+        u32                             ssv_len;
+
+        /* The fore and back channel */
+        struct nfs4_channel_attrs       fc_attrs;
+        struct nfs4_slot_table          fc_slot_table;
+        struct nfs4_channel_attrs       bc_attrs;
+        struct nfs4_slot_table          bc_slot_table;
+        struct nfs_client               *clp;
+};
+
+#endif /* CONFIG_NFS_V4_1 */
 #endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index b89c34e40bc2..62f63fb0c4c8 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -145,6 +145,44 @@ struct nfs4_change_info {
 };
 
 struct nfs_seqid;
+
+/* nfs41 sessions channel attributes */
+struct nfs4_channel_attrs {
+        u32                     headerpadsz;
+        u32                     max_rqst_sz;
+        u32                     max_resp_sz;
+        u32                     max_resp_sz_cached;
+        u32                     max_ops;
+        u32                     max_reqs;
+};
+
+/* nfs41 sessions slot seqid */
+struct nfs4_slot {
+        u32                     seq_nr;
+};
+
+struct nfs4_sequence_args {
+        struct nfs4_session     *sa_session;
+        u8                      sa_slotid;
+        u8                      sa_cache_this;
+};
+
+struct nfs4_sequence_res {
+        struct nfs4_session     *sr_session;
+        u8                      sr_slotid;      /* slot used to send request */
+        unsigned long           sr_renewal_time;
+        int                     sr_status;      /* sequence operation status */
+};
+
+struct nfs4_get_lease_time_args {
+        struct nfs4_sequence_args       la_seq_args;
+};
+
+struct nfs4_get_lease_time_res {
+        struct nfs_fsinfo              *lr_fsinfo;
+        struct nfs4_sequence_res        lr_seq_res;
+};
+
 /*
  * Arguments to the open call.
  */
@@ -165,6 +203,7 @@ struct nfs_openargs {
         const struct nfs_server *server;         /* Needed for ID mapping */
         const u32 *             bitmask;
         __u32                   claim;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_openres {
@@ -181,6 +220,7 @@ struct nfs_openres {
         __u32                   do_recall;
         __u64                   maxsize;
         __u32                   attrset[NFS4_BITMAP_SIZE];
+        struct nfs4_sequence_res        seq_res;
 };
 
 /*
@@ -206,6 +246,7 @@ struct nfs_closeargs {
         struct nfs_seqid *      seqid;
         fmode_t                 fmode;
         const u32 *             bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_closeres {
@@ -213,6 +254,7 @@ struct nfs_closeres {
         struct nfs_fattr *      fattr;
         struct nfs_seqid *      seqid;
         const struct nfs_server *server;
+        struct nfs4_sequence_res        seq_res;
 };
 /*
  *  * Arguments to the lock,lockt, and locku call.
@@ -233,12 +275,14 @@ struct nfs_lock_args {
         unsigned char           block : 1;
         unsigned char           reclaim : 1;
         unsigned char           new_lock_owner : 1;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_lock_res {
         nfs4_stateid            stateid;
         struct nfs_seqid *      lock_seqid;
         struct nfs_seqid *      open_seqid;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs_locku_args {
@@ -246,32 +290,38 @@ struct nfs_locku_args {
         struct file_lock *      fl;
         struct nfs_seqid *      seqid;
         nfs4_stateid *          stateid;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_locku_res {
         nfs4_stateid            stateid;
         struct nfs_seqid *      seqid;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs_lockt_args {
         struct nfs_fh *         fh;
         struct file_lock *      fl;
         struct nfs_lowner       lock_owner;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_lockt_res {
         struct file_lock *      denied; /* LOCK, LOCKT failed */
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_delegreturnargs {
         const struct nfs_fh *fhandle;
         const nfs4_stateid *stateid;
         const u32 * bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_delegreturnres {
         struct nfs_fattr * fattr;
         const struct nfs_server *server;
+        struct nfs4_sequence_res        seq_res;
 };
 
 /*
@@ -284,12 +334,14 @@ struct nfs_readargs {
         __u32                   count;
         unsigned int            pgbase;
         struct page **          pages;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_readres {
         struct nfs_fattr *      fattr;
         __u32                   count;
         int                     eof;
+        struct nfs4_sequence_res        seq_res;
 };
 
 /*
@@ -304,6 +356,7 @@ struct nfs_writeargs {
         unsigned int            pgbase;
         struct page **          pages;
         const u32 *             bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_writeverf {
@@ -316,6 +369,7 @@ struct nfs_writeres {
         struct nfs_writeverf *  verf;
         __u32                   count;
         const struct nfs_server *server;
+        struct nfs4_sequence_res        seq_res;
 };
 
 /*
@@ -325,12 +379,14 @@ struct nfs_removeargs {
         const struct nfs_fh     *fh;
         struct qstr             name;
         const u32 *             bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_removeres {
         const struct nfs_server *server;
         struct nfs4_change_info cinfo;
         struct nfs_fattr        dir_attr;
+        struct nfs4_sequence_res        seq_res;
 };
 
 /*
@@ -383,6 +439,7 @@ struct nfs_setattrargs {
         struct iattr *                  iap;
         const struct nfs_server *       server; /* Needed for name mapping */
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs_setaclargs {
@@ -390,6 +447,11 @@ struct nfs_setaclargs {
         size_t                          acl_len;
         unsigned int                    acl_pgbase;
         struct page **                  acl_pages;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs_setaclres {
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs_getaclargs {
@@ -397,11 +459,18 @@ struct nfs_getaclargs {
         size_t                          acl_len;
         unsigned int                    acl_pgbase;
         struct page **                  acl_pages;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs_getaclres {
+        size_t                          acl_len;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs_setattrres {
         struct nfs_fattr *              fattr;
         const struct nfs_server *       server;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs_linkargs {
@@ -583,6 +652,7 @@ struct nfs4_accessargs {
         const struct nfs_fh *           fh;
         const u32 *                     bitmask;
         u32                             access;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_accessres {
@@ -590,6 +660,7 @@ struct nfs4_accessres {
         struct nfs_fattr *              fattr;
         u32                             supported;
         u32                             access;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_create_arg {
@@ -609,6 +680,7 @@ struct nfs4_create_arg {
         const struct iattr *            attrs;
         const struct nfs_fh *           dir_fh;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_create_res {
@@ -617,21 +689,30 @@ struct nfs4_create_res {
         struct nfs_fattr *              fattr;
         struct nfs4_change_info         dir_cinfo;
         struct nfs_fattr *              dir_fattr;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_fsinfo_arg {
         const struct nfs_fh *           fh;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs4_fsinfo_res {
+        struct nfs_fsinfo              *fsinfo;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_getattr_arg {
         const struct nfs_fh *           fh;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_getattr_res {
         const struct nfs_server *       server;
         struct nfs_fattr *              fattr;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_link_arg {
@@ -639,6 +720,7 @@ struct nfs4_link_arg {
         const struct nfs_fh *           dir_fh;
         const struct qstr *             name;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_link_res {
@@ -646,6 +728,7 @@ struct nfs4_link_res {
         struct nfs_fattr *              fattr;
         struct nfs4_change_info         cinfo;
         struct nfs_fattr *              dir_attr;
+        struct nfs4_sequence_res        seq_res;
 };
 
 
@@ -653,21 +736,30 @@ struct nfs4_lookup_arg {
         const struct nfs_fh *           dir_fh;
         const struct qstr *             name;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_lookup_res {
         const struct nfs_server *       server;
         struct nfs_fattr *              fattr;
         struct nfs_fh *                 fh;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_lookup_root_arg {
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_pathconf_arg {
         const struct nfs_fh *           fh;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs4_pathconf_res {
+        struct nfs_pathconf            *pathconf;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_readdir_arg {
@@ -678,11 +770,13 @@ struct nfs4_readdir_arg {
         struct page **                  pages;  /* zero-copy data */
         unsigned int                    pgbase; /* zero-copy data */
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_readdir_res {
         nfs4_verifier                   verifier;
         unsigned int                    pgbase;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_readlink {
@@ -690,6 +784,11 @@ struct nfs4_readlink {
         unsigned int                    pgbase;
         unsigned int                    pglen;   /* zero-copy data */
         struct page **                  pages;   /* zero-copy data */
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs4_readlink_res {
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_rename_arg {
@@ -698,6 +797,7 @@ struct nfs4_rename_arg {
         const struct qstr *             old_name;
         const struct qstr *             new_name;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_rename_res {
@@ -706,6 +806,7 @@ struct nfs4_rename_res {
         struct nfs_fattr *              old_fattr;
         struct nfs4_change_info         new_cinfo;
         struct nfs_fattr *              new_fattr;
+        struct nfs4_sequence_res        seq_res;
 };
 
 #define NFS4_SETCLIENTID_NAMELEN        (127)
@@ -724,6 +825,17 @@ struct nfs4_setclientid {
 struct nfs4_statfs_arg {
         const struct nfs_fh *           fh;
         const u32 *                     bitmask;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs4_statfs_res {
+        struct nfs_fsstat              *fsstat;
+        struct nfs4_sequence_res        seq_res;
+};
+
+struct nfs4_server_caps_arg {
+        struct nfs_fh                  *fhandle;
+        struct nfs4_sequence_args       seq_args;
 };
 
 struct nfs4_server_caps_res {
@@ -731,6 +843,7 @@ struct nfs4_server_caps_res {
         u32                             acl_bitmask;
         u32                             has_links;
         u32                             has_symlinks;
+        struct nfs4_sequence_res        seq_res;
 };
 
 struct nfs4_string {
@@ -765,10 +878,68 @@ struct nfs4_fs_locations_arg {
         const struct qstr *name;
         struct page *page;
         const u32 *bitmask;
+        struct nfs4_sequence_args       seq_args;
+};
+
+struct nfs4_fs_locations_res {
+        struct nfs4_fs_locations       *fs_locations;
+        struct nfs4_sequence_res        seq_res;
 };
 
 #endif /* CONFIG_NFS_V4 */
 
+struct nfstime4 {
+        u64     seconds;
+        u32     nseconds;
+};
+
+#ifdef CONFIG_NFS_V4_1
+struct nfs_impl_id4 {
+        u32             domain_len;
+        char            *domain;
+        u32             name_len;
+        char            *name;
+        struct nfstime4 date;
+};
+
+#define NFS4_EXCHANGE_ID_LEN    (48)
+struct nfs41_exchange_id_args {
+        struct nfs_client               *client;
+        nfs4_verifier                   *verifier;
+        unsigned int                    id_len;
+        char                            id[NFS4_EXCHANGE_ID_LEN];
+        u32                             flags;
+};
+
+struct server_owner {
+        uint64_t                        minor_id;
+        uint32_t                        major_id_sz;
+        char                            major_id[NFS4_OPAQUE_LIMIT];
+};
+
+struct server_scope {
+        uint32_t                        server_scope_sz;
+        char                            server_scope[NFS4_OPAQUE_LIMIT];
+};
+
+struct nfs41_exchange_id_res {
+        struct nfs_client               *client;
+        u32                             flags;
+};
+
+struct nfs41_create_session_args {
+        struct nfs_client              *client;
+        uint32_t                        flags;
+        uint32_t                        cb_program;
+        struct nfs4_channel_attrs       fc_attrs;       /* Fore Channel */
+        struct nfs4_channel_attrs       bc_attrs;       /* Back Channel */
+};
+
+struct nfs41_create_session_res {
+        struct nfs_client              *client;
+};
+#endif /* CONFIG_NFS_V4_1 */
+
 struct nfs_page;
 
 #define NFS_PAGEVEC_SIZE        (8U)
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 4d61c873feed..7ef4b7ad1214 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -41,7 +41,6 @@
 #include <linux/kref.h>
 #include <linux/sunrpc/clnt.h>
 
-#define NFS4_OPAQUE_LIMIT 1024
 typedef struct {
         u32             cl_boot;
         u32             cl_id;
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/svcsock.h b/include/linux/sunrpc/svcsock.h
index 483e10380aae..6bb1ec4ae310 100644
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -42,6 +42,8 @@ int		svc_sock_names(char *buf, struct svc_serv *serv, char *toclose);
 int             svc_addsock(struct svc_serv *serv, int fd, char *name_return);
 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 */