Merge tag 'nfs-for-3.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

   - Changes to the RPC socket code to allow NFSv4 to turn off
     timeout+retry:
      * Detect TCP connection breakage through the "keepalive" mechanism
   - Add client side support for NFSv4.x migration (Chuck Lever)
   - Add support for multiple security flavour arguments to the "sec="
     mount option (Dros Adamson)
   - fs-cache bugfixes from David Howells:
     * Fix an issue whereby caching can be enabled on a file that is
       open for writing
   - More NFSv4 open code stable bugfixes
   - Various Labeled NFS (selinux) bugfixes, including one stable fix
   - Fix buffer overflow checking in the RPCSEC_GSS upcall encoding"

* tag 'nfs-for-3.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (68 commits)
  NFSv4.2: Remove redundant checks in nfs_setsecurity+nfs4_label_init_security
  NFSv4: Sanity check the server reply in _nfs4_server_capabilities
  NFSv4.2: encode_readdir - only ask for labels when doing readdirplus
  nfs: set security label when revalidating inode
  NFSv4.2: Fix a mismatch between Linux labeled NFS and the NFSv4.2 spec
  NFS: Fix a missing initialisation when reading the SELinux label
  nfs: fix oops when trying to set SELinux label
  nfs: fix inverted test for delegation in nfs4_reclaim_open_state
  SUNRPC: Cleanup xs_destroy()
  SUNRPC: close a rare race in xs_tcp_setup_socket.
  SUNRPC: remove duplicated include from clnt.c
  nfs: use IS_ROOT not DCACHE_DISCONNECTED
  SUNRPC: Fix buffer overflow checking in gss_encode_v0_msg/gss_encode_v1_msg
  SUNRPC: gss_alloc_msg - choose _either_ a v0 message or a v1 message
  SUNRPC: remove an unnecessary if statement
  nfs: Use PTR_ERR_OR_ZERO in 'nfs/nfs4super.c'
  nfs: Use PTR_ERR_OR_ZERO in 'nfs41_callback_up' function
  nfs: Remove useless 'error' assignment
  sunrpc: comment typo fix
  SUNRPC: Add correct rcu_dereference annotation in rpc_clnt_set_transport
  ...

11 files changed, 175 insertions, 51 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3f40547ba191..955dff5da56a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2292,6 +2292,11 @@ static inline void allow_write_access(struct file *file)
         if (file)
                 atomic_inc(&file_inode(file)->i_writecount);
 }
+static inline bool inode_is_open_for_write(const struct inode *inode)
+{
+        return atomic_read(&inode->i_writecount) > 0;
+}
+
 #ifdef CONFIG_IMA
 static inline void i_readcount_dec(struct inode *inode)
 {
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 7823e9ef995e..771484993ca7 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -308,36 +308,6 @@ struct fscache_cache_ops {
         void (*dissociate_pages)(struct fscache_cache *cache);
 };
 
-/*
- * data file or index object cookie
- * - a file will only appear in one cache
- * - a request to cache a file may or may not be honoured, subject to
- *   constraints such as disk space
- * - indices are created on disk just-in-time
- */
-struct fscache_cookie {
-        atomic_t                        usage;          /* number of users of this cookie */
-        atomic_t                        n_children;     /* number of children of this cookie */
-        atomic_t                        n_active;       /* number of active users of netfs ptrs */
-        spinlock_t                      lock;
-        spinlock_t                      stores_lock;    /* lock on page store tree */
-        struct hlist_head               backing_objects; /* object(s) backing this file/index */
-        const struct fscache_cookie_def *def;           /* definition */
-        struct fscache_cookie           *parent;        /* parent of this entry */
-        void                            *netfs_data;    /* back pointer to netfs */
-        struct radix_tree_root          stores;         /* pages to be stored on this cookie */
-#define FSCACHE_COOKIE_PENDING_TAG      0               /* pages tag: pending write to cache */
-#define FSCACHE_COOKIE_STORING_TAG      1               /* pages tag: writing to cache */
-
-        unsigned long                   flags;
-#define FSCACHE_COOKIE_LOOKING_UP       0       /* T if non-index cookie being looked up still */
-#define FSCACHE_COOKIE_NO_DATA_YET      1       /* T if new object with no cached data yet */
-#define FSCACHE_COOKIE_UNAVAILABLE      2       /* T if cookie is unavailable (error, etc) */
-#define FSCACHE_COOKIE_INVALIDATING     3       /* T if cookie is being invalidated */
-#define FSCACHE_COOKIE_RELINQUISHED     4       /* T if cookie has been relinquished */
-#define FSCACHE_COOKIE_RETIRED          5       /* T if cookie was retired */
-};
-
 extern struct fscache_cookie fscache_fsdef_index;
 
 /*
@@ -400,6 +370,7 @@ struct fscache_object {
 #define FSCACHE_OBJECT_IS_LIVE          3       /* T if object is not withdrawn or relinquished */
 #define FSCACHE_OBJECT_IS_LOOKED_UP     4       /* T if object has been looked up */
 #define FSCACHE_OBJECT_IS_AVAILABLE     5       /* T if object has become active */
+#define FSCACHE_OBJECT_RETIRED          6       /* T if object was retired on relinquishment */
 
         struct list_head        cache_link;     /* link in cache->object_list */
         struct hlist_node       cookie_link;    /* link in cookie->backing_objects */
@@ -511,6 +482,11 @@ static inline void fscache_end_io(struct fscache_retrieval *op,
         op->end_io_func(page, op->context, error);
 }
 
+static inline void __fscache_use_cookie(struct fscache_cookie *cookie)
+{
+        atomic_inc(&cookie->n_active);
+}
+
 /**
  * fscache_use_cookie - Request usage of cookie attached to an object
  * @object: Object description
@@ -524,6 +500,16 @@ static inline bool fscache_use_cookie(struct fscache_object *object)
         return atomic_inc_not_zero(&cookie->n_active) != 0;
 }
 
+static inline bool __fscache_unuse_cookie(struct fscache_cookie *cookie)
+{
+        return atomic_dec_and_test(&cookie->n_active);
+}
+
+static inline void __fscache_wake_unused_cookie(struct fscache_cookie *cookie)
+{
+        wake_up_atomic_t(&cookie->n_active);
+}
+
 /**
  * fscache_unuse_cookie - Cease usage of cookie attached to an object
  * @object: Object description
@@ -534,8 +520,8 @@ static inline bool fscache_use_cookie(struct fscache_object *object)
 static inline void fscache_unuse_cookie(struct fscache_object *object)
 {
         struct fscache_cookie *cookie = object->cookie;
-        if (atomic_dec_and_test(&cookie->n_active))
-                wake_up_atomic_t(&cookie->n_active);
+        if (__fscache_unuse_cookie(cookie))
+                __fscache_wake_unused_cookie(cookie);
 }
 
 /*
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 19b46458e4e8..115bb81912cc 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -167,6 +167,42 @@ struct fscache_netfs {
 };
 
 /*
+ * data file or index object cookie
+ * - a file will only appear in one cache
+ * - a request to cache a file may or may not be honoured, subject to
+ *   constraints such as disk space
+ * - indices are created on disk just-in-time
+ */
+struct fscache_cookie {
+        atomic_t                        usage;          /* number of users of this cookie */
+        atomic_t                        n_children;     /* number of children of this cookie */
+        atomic_t                        n_active;       /* number of active users of netfs ptrs */
+        spinlock_t                      lock;
+        spinlock_t                      stores_lock;    /* lock on page store tree */
+        struct hlist_head               backing_objects; /* object(s) backing this file/index */
+        const struct fscache_cookie_def *def;           /* definition */
+        struct fscache_cookie           *parent;        /* parent of this entry */
+        void                            *netfs_data;    /* back pointer to netfs */
+        struct radix_tree_root          stores;         /* pages to be stored on this cookie */
+#define FSCACHE_COOKIE_PENDING_TAG      0               /* pages tag: pending write to cache */
+#define FSCACHE_COOKIE_STORING_TAG      1               /* pages tag: writing to cache */
+
+        unsigned long                   flags;
+#define FSCACHE_COOKIE_LOOKING_UP       0       /* T if non-index cookie being looked up still */
+#define FSCACHE_COOKIE_NO_DATA_YET      1       /* T if new object with no cached data yet */
+#define FSCACHE_COOKIE_UNAVAILABLE      2       /* T if cookie is unavailable (error, etc) */
+#define FSCACHE_COOKIE_INVALIDATING     3       /* T if cookie is being invalidated */
+#define FSCACHE_COOKIE_RELINQUISHED     4       /* T if cookie has been relinquished */
+#define FSCACHE_COOKIE_ENABLED          5       /* T if cookie is enabled */
+#define FSCACHE_COOKIE_ENABLEMENT_LOCK  6       /* T if cookie is being en/disabled */
+};
+
+static inline bool fscache_cookie_enabled(struct fscache_cookie *cookie)
+{
+        return test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+}
+
+/*
  * slow-path functions for when there is actually caching available, and the
  * netfs does actually have a valid token
  * - these are not to be called directly
@@ -181,8 +217,8 @@ extern void __fscache_release_cache_tag(struct fscache_cache_tag *);
 extern struct fscache_cookie *__fscache_acquire_cookie(
         struct fscache_cookie *,
         const struct fscache_cookie_def *,
-        void *);
-extern void __fscache_relinquish_cookie(struct fscache_cookie *, int);
+        void *, bool);
+extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
 extern int __fscache_check_consistency(struct fscache_cookie *);
 extern void __fscache_update_cookie(struct fscache_cookie *);
 extern int __fscache_attr_changed(struct fscache_cookie *);
@@ -211,6 +247,9 @@ extern void __fscache_uncache_all_inode_pages(struct fscache_cookie *,
                                               struct inode *);
 extern void __fscache_readpages_cancel(struct fscache_cookie *cookie,
                                        struct list_head *pages);
+extern void __fscache_disable_cookie(struct fscache_cookie *, bool);
+extern void __fscache_enable_cookie(struct fscache_cookie *,
+                                    bool (*)(void *), void *);
 
 /**
  * fscache_register_netfs - Register a filesystem as desiring caching services
@@ -289,6 +328,7 @@ void fscache_release_cache_tag(struct fscache_cache_tag *tag)
  * @def: A description of the cache object, including callback operations
  * @netfs_data: An arbitrary piece of data to be kept in the cookie to
  * represent the cache object to the netfs
+ * @enable: Whether or not to enable a data cookie immediately
  *
  * This function is used to inform FS-Cache about part of an index hierarchy
  * that can be used to locate files.  This is done by requesting a cookie for
@@ -301,10 +341,12 @@ static inline
 struct fscache_cookie *fscache_acquire_cookie(
         struct fscache_cookie *parent,
         const struct fscache_cookie_def *def,
-        void *netfs_data)
+        void *netfs_data,
+        bool enable)
 {
-        if (fscache_cookie_valid(parent))
-                return __fscache_acquire_cookie(parent, def, netfs_data);
+        if (fscache_cookie_valid(parent) && fscache_cookie_enabled(parent))
+                return __fscache_acquire_cookie(parent, def, netfs_data,
+                                                enable);
         else
                 return NULL;
 }
@@ -322,7 +364,7 @@ struct fscache_cookie *fscache_acquire_cookie(
  * description.
  */
 static inline
-void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
+void fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
 {
         if (fscache_cookie_valid(cookie))
                 __fscache_relinquish_cookie(cookie, retire);
@@ -341,7 +383,7 @@ void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
 static inline
 int fscache_check_consistency(struct fscache_cookie *cookie)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_check_consistency(cookie);
         else
                 return 0;
@@ -360,7 +402,7 @@ int fscache_check_consistency(struct fscache_cookie *cookie)
 static inline
 void fscache_update_cookie(struct fscache_cookie *cookie)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 __fscache_update_cookie(cookie);
 }
 
@@ -407,7 +449,7 @@ void fscache_unpin_cookie(struct fscache_cookie *cookie)
 static inline
 int fscache_attr_changed(struct fscache_cookie *cookie)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_attr_changed(cookie);
         else
                 return -ENOBUFS;
@@ -429,7 +471,7 @@ int fscache_attr_changed(struct fscache_cookie *cookie)
 static inline
 void fscache_invalidate(struct fscache_cookie *cookie)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 __fscache_invalidate(cookie);
 }
 
@@ -503,7 +545,7 @@ int fscache_read_or_alloc_page(struct fscache_cookie *cookie,
                                void *context,
                                gfp_t gfp)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_read_or_alloc_page(cookie, page, end_io_func,
                                                     context, gfp);
         else
@@ -554,7 +596,7 @@ int fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
                                 void *context,
                                 gfp_t gfp)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_read_or_alloc_pages(cookie, mapping, pages,
                                                      nr_pages, end_io_func,
                                                      context, gfp);
@@ -585,7 +627,7 @@ int fscache_alloc_page(struct fscache_cookie *cookie,
                        struct page *page,
                        gfp_t gfp)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_alloc_page(cookie, page, gfp);
         else
                 return -ENOBUFS;
@@ -634,7 +676,7 @@ int fscache_write_page(struct fscache_cookie *cookie,
                        struct page *page,
                        gfp_t gfp)
 {
-        if (fscache_cookie_valid(cookie))
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
                 return __fscache_write_page(cookie, page, gfp);
         else
                 return -ENOBUFS;
@@ -744,4 +786,47 @@ void fscache_uncache_all_inode_pages(struct fscache_cookie *cookie,
                 __fscache_uncache_all_inode_pages(cookie, inode);
 }
 
+/**
+ * fscache_disable_cookie - Disable a cookie
+ * @cookie: The cookie representing the cache object
+ * @invalidate: Invalidate the backing object
+ *
+ * Disable a cookie from accepting further alloc, read, write, invalidate,
+ * update or acquire operations.  Outstanding operations can still be waited
+ * upon and pages can still be uncached and the cookie relinquished.
+ *
+ * This will not return until all outstanding operations have completed.
+ *
+ * If @invalidate is set, then the backing object will be invalidated and
+ * detached, otherwise it will just be detached.
+ */
+static inline
+void fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
+{
+        if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+                __fscache_disable_cookie(cookie, invalidate);
+}
+
+/**
+ * fscache_enable_cookie - Reenable a cookie
+ * @cookie: The cookie representing the cache object
+ * @can_enable: A function to permit enablement once lock is held
+ * @data: Data for can_enable()
+ *
+ * Reenable a previously disabled cookie, allowing it to accept further alloc,
+ * read, write, invalidate, update or acquire operations.  An attempt will be
+ * made to immediately reattach the cookie to a backing object.
+ *
+ * The can_enable() function is called (if not NULL) once the enablement lock
+ * is held to rule on whether enablement is still permitted to go ahead.
+ */
+static inline
+void fscache_enable_cookie(struct fscache_cookie *cookie,
+                           bool (*can_enable)(void *data),
+                           void *data)
+{
+        if (fscache_cookie_valid(cookie) && !fscache_cookie_enabled(cookie))
+                __fscache_enable_cookie(cookie, can_enable, data);
+}
+
 #endif /* _LINUX_FSCACHE_H */
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index e36dee52f224..c6f41b616965 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -395,7 +395,9 @@ enum lock_type4 {
 #define FATTR4_WORD1_FS_LAYOUT_TYPES    (1UL << 30)
 #define FATTR4_WORD2_LAYOUT_BLKSIZE     (1UL << 1)
 #define FATTR4_WORD2_MDSTHRESHOLD       (1UL << 4)
-#define FATTR4_WORD2_SECURITY_LABEL     (1UL << 17)
+#define FATTR4_WORD2_SECURITY_LABEL     (1UL << 16)
+#define FATTR4_WORD2_CHANGE_SECURITY_LABEL \
+                                        (1UL << 17)
 
 /* MDS threshold bitmap bits */
 #define THRESHOLD_RD                    (1UL << 0)
@@ -460,6 +462,7 @@ enum {
         NFSPROC4_CLNT_FS_LOCATIONS,
         NFSPROC4_CLNT_RELEASE_LOCKOWNER,
         NFSPROC4_CLNT_SECINFO,
+        NFSPROC4_CLNT_FSID_PRESENT,
 
         /* nfs41 */
         NFSPROC4_CLNT_EXCHANGE_ID,
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 3ea4cde8701c..14a48207a304 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -269,9 +269,13 @@ static inline int NFS_STALE(const struct inode *inode)
         return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 }
 
-static inline int NFS_FSCACHE(const struct inode *inode)
+static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
 {
-        return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
+#ifdef CONFIG_NFS_FSCACHE
+        return NFS_I(inode)->fscache;
+#else
+        return NULL;
+#endif
 }
 
 static inline __u64 NFS_FILEID(const struct inode *inode)
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index b8cedced50c9..1150ea41b626 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -41,6 +41,7 @@ struct nfs_client {
 #define NFS_CS_DISCRTRY         1               /* - disconnect on RPC retry */
 #define NFS_CS_MIGRATION        2               /* - transparent state migr */
 #define NFS_CS_INFINITE_SLOTS   3               /* - don't limit TCP slots */
+#define NFS_CS_NO_RETRANS_TIMEOUT       4       /* - Disable retransmit timeouts */
         struct sockaddr_storage cl_addr;        /* server identifier */
         size_t                  cl_addrlen;
         char *                  cl_hostname;    /* hostname of server */
@@ -78,6 +79,7 @@ struct nfs_client {
         char                    cl_ipaddr[48];
         u32                     cl_cb_ident;    /* v4.0 callback identifier */
         const struct nfs4_minor_version_ops *cl_mvops;
+        unsigned long           cl_mig_gen;
 
         /* NFSv4.0 transport blocking */
         struct nfs4_slot_table  *cl_slot_tbl;
@@ -147,7 +149,9 @@ struct nfs_server {
         __u64                   maxfilesize;    /* maximum file size */
         struct timespec         time_delta;     /* smallest time granularity */
         unsigned long           mount_time;     /* when this fs was mounted */
+        struct super_block      *super;         /* VFS super block */
         dev_t                   s_dev;          /* superblock dev numbers */
+        struct nfs_auth_info    auth_info;      /* parsed auth flavors */
 
 #ifdef CONFIG_NFS_FSCACHE
         struct nfs_fscache_key  *fscache_key;   /* unique key for superblock */
@@ -187,6 +191,12 @@ struct nfs_server {
         struct list_head        state_owners_lru;
         struct list_head        layouts;
         struct list_head        delegations;
+
+        unsigned long           mig_gen;
+        unsigned long           mig_status;
+#define NFS_MIG_IN_TRANSITION           (1)
+#define NFS_MIG_FAILED                  (2)
+
         void (*destroy)(struct nfs_server *);
 
         atomic_t active; /* Keep trace of any activity to this server */
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 49f52c8f4422..3ccfcecf8999 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -591,6 +591,13 @@ struct nfs_renameres {
         struct nfs_fattr                *new_fattr;
 };
 
+/* parsed sec= options */
+#define NFS_AUTH_INFO_MAX_FLAVORS 12 /* see fs/nfs/super.c */
+struct nfs_auth_info {
+        unsigned int            flavor_len;
+        rpc_authflavor_t        flavors[NFS_AUTH_INFO_MAX_FLAVORS];
+};
+
 /*
  * Argument struct for decode_entry function
  */
@@ -1053,14 +1060,18 @@ struct nfs4_fs_locations {
 struct nfs4_fs_locations_arg {
         struct nfs4_sequence_args       seq_args;
         const struct nfs_fh *dir_fh;
+        const struct nfs_fh *fh;
         const struct qstr *name;
         struct page *page;
         const u32 *bitmask;
+        clientid4 clientid;
+        unsigned char migration:1, renew:1;
 };
 
 struct nfs4_fs_locations_res {
         struct nfs4_sequence_res        seq_res;
         struct nfs4_fs_locations       *fs_locations;
+        unsigned char                   migration:1, renew:1;
 };
 
 struct nfs4_secinfo4 {
@@ -1084,6 +1095,19 @@ struct nfs4_secinfo_res {
         struct nfs4_secinfo_flavors     *flavors;
 };
 
+struct nfs4_fsid_present_arg {
+        struct nfs4_sequence_args       seq_args;
+        const struct nfs_fh             *fh;
+        clientid4                       clientid;
+        unsigned char                   renew:1;
+};
+
+struct nfs4_fsid_present_res {
+        struct nfs4_sequence_res        seq_res;
+        struct nfs_fh                   *fh;
+        unsigned char                   renew:1;
+};
+
 #endif /* CONFIG_NFS_V4 */
 
 struct nfstime4 {
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 6740801aa71a..8af2804bab16 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -49,6 +49,7 @@ struct rpc_clnt {
 
         unsigned int            cl_softrtry : 1,/* soft timeouts */
                                 cl_discrtry : 1,/* disconnect before retry */
+                                cl_noretranstimeo: 1,/* No retransmit timeouts */
                                 cl_autobind : 1,/* use getport() */
                                 cl_chatty   : 1;/* be verbose */
 
@@ -126,6 +127,7 @@ struct rpc_create_args {
 #define RPC_CLNT_CREATE_QUIET           (1UL << 6)
 #define RPC_CLNT_CREATE_INFINITE_SLOTS  (1UL << 7)
 #define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT (1UL << 8)
+#define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT      (1UL << 9)
 
 struct rpc_clnt *rpc_create(struct rpc_create_args *args);
 struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
@@ -134,6 +136,10 @@ void rpc_task_reset_client(struct rpc_task *task, struct rpc_clnt *clnt);
 struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
 struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *,
                                 rpc_authflavor_t);
+int             rpc_switch_client_transport(struct rpc_clnt *,
+                                struct xprt_create *,
+                                const struct rpc_timeout *);
+
 void            rpc_shutdown_client(struct rpc_clnt *);
 void            rpc_release_client(struct rpc_clnt *);
 void            rpc_task_release_client(struct rpc_task *);
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 096ee58be11a..3a847de83fab 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -122,6 +122,7 @@ struct rpc_task_setup {
 #define RPC_TASK_SENT           0x0800          /* message was sent */
 #define RPC_TASK_TIMEOUT        0x1000          /* fail with ETIMEDOUT on timeout */
 #define RPC_TASK_NOCONNECT      0x2000          /* return ENOTCONN if not connected */
+#define RPC_TASK_NO_RETRANS_TIMEOUT     0x4000          /* wait forever for a reply */
 
 #define RPC_IS_ASYNC(t)         ((t)->tk_flags & RPC_TASK_ASYNC)
 #define RPC_IS_SWAPPER(t)       ((t)->tk_flags & RPC_TASK_SWAPPER)
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index cec7b9b5e1bf..8097b9df6773 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -288,7 +288,7 @@ int			xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 int                     xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 void                    xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
 void                    xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
-int                     xprt_prepare_transmit(struct rpc_task *task);
+bool                    xprt_prepare_transmit(struct rpc_task *task);
 void                    xprt_transmit(struct rpc_task *task);
 void                    xprt_end_transmit(struct rpc_task *task);
 int                     xprt_adjust_timeout(struct rpc_rqst *req);
diff --git a/include/uapi/linux/nfs_mount.h b/include/uapi/linux/nfs_mount.h
index 576bddd72e04..64b0f22f5c4c 100644
--- a/include/uapi/linux/nfs_mount.h
+++ b/include/uapi/linux/nfs_mount.h
@@ -60,7 +60,7 @@ struct nfs_mount_data {
 #define NFS_MOUNT_BROKEN_SUID   0x0400  /* 4 */
 #define NFS_MOUNT_NOACL         0x0800  /* 4 */
 #define NFS_MOUNT_STRICTLOCK    0x1000  /* reserved for NFSv4 */
-#define NFS_MOUNT_SECFLAVOUR    0x2000  /* 5 */
+#define NFS_MOUNT_SECFLAVOUR    0x2000  /* 5 non-text parsed mount data only */
 #define NFS_MOUNT_NORDIRPLUS    0x4000  /* 5 */
 #define NFS_MOUNT_UNSHARED      0x8000  /* 5 */
 #define NFS_MOUNT_FLAGMASK      0xFFFF