Merge branch 'for-linus' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'for-linus' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (58 commits)
  SUNRPC: Ensure IPV6_V6ONLY is set on the socket before binding to a port
  NSM: Fix unaligned accesses in nsm_init_private()
  NFS: Simplify logic to compare socket addresses in client.c
  NFS: Start PF_INET6 callback listener only if IPv6 support is available
  lockd: Start PF_INET6 listener only if IPv6 support is available
  SUNRPC: Remove CONFIG_SUNRPC_REGISTER_V4
  SUNRPC: rpcb_register() should handle errors silently
  SUNRPC: Simplify kernel RPC service registration
  SUNRPC: Simplify svc_unregister()
  SUNRPC: Allow callers to pass rpcb_v4_register a NULL address
  SUNRPC: rpcbind actually interprets r_owner string
  SUNRPC: Clean up address type casts in rpcb_v4_register()
  SUNRPC: Don't return EPROTONOSUPPORT in svc_register()'s helpers
  SUNRPC: Use IPv4 loopback for registering AF_INET6 kernel RPC services
  SUNRPC: Set IPV6ONLY flag on PF_INET6 RPC listener sockets
  NFS: Revert creation of IPv6 listeners for lockd and NFSv4 callbacks
  SUNRPC: Remove @family argument from svc_create() and svc_create_pooled()
  SUNRPC: Change svc_create_xprt() to take a @family argument
  SUNRPC: svc_setup_socket() gets protocol family from socket
  SUNRPC: Pass a family argument to svc_register()
  ...

fs/lockd/clntlock.c

@@ -139,55 +139,6 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
 	return 0;
 }
 
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static const struct in6_addr *nlmclnt_map_v4addr(const struct sockaddr *sap,
-						 struct in6_addr *addr_mapped)
-{
-	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
-
-	switch (sap->sa_family) {
-	case AF_INET6:
-		return &((const struct sockaddr_in6 *)sap)->sin6_addr;
-	case AF_INET:
-		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, addr_mapped);
-		return addr_mapped;
-	}
-
-	return NULL;
-}
-
-/*
- * If lockd is using a PF_INET6 listener, all incoming requests appear
- * to come from AF_INET6 remotes.  The address of AF_INET remotes are
- * mapped to AF_INET6 automatically by the network layer.  In case the
- * user passed an AF_INET server address at mount time, ensure both
- * addresses are AF_INET6 before comparing them.
- */
-static int nlmclnt_cmp_addr(const struct nlm_host *host,
-			    const struct sockaddr *sap)
-{
-	const struct in6_addr *addr1;
-	const struct in6_addr *addr2;
-	struct in6_addr addr1_mapped;
-	struct in6_addr addr2_mapped;
-
-	addr1 = nlmclnt_map_v4addr(nlm_addr(host), &addr1_mapped);
-	if (likely(addr1 != NULL)) {
-		addr2 = nlmclnt_map_v4addr(sap, &addr2_mapped);
-		if (likely(addr2 != NULL))
-			return ipv6_addr_equal(addr1, addr2);
-	}
-
-	return 0;
-}
-#else	/* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
-static int nlmclnt_cmp_addr(const struct nlm_host *host,
-			    const struct sockaddr *sap)
-{
-	return nlm_cmp_addr(nlm_addr(host), sap);
-}
-#endif	/* !(CONFIG_IPV6 || CONFIG_IPV6_MODULE) */
-
 /*
  * The server lockd has called us back to tell us the lock was granted
  */
@@ -215,7 +166,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
 		 */
 		if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
 			continue;
-		if (!nlmclnt_cmp_addr(block->b_host, addr))
+		if (!nlm_cmp_addr(nlm_addr(block->b_host), addr))
 			continue;
 		if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
 			continue;

fs/lockd/mon.c

@@ -16,6 +16,8 @@
 #include <linux/sunrpc/svc.h>
 #include <linux/lockd/lockd.h>
 
+#include <asm/unaligned.h>
+
 #define NLMDBG_FACILITY		NLMDBG_MONITOR
 #define NSM_PROGRAM		100024
 #define NSM_VERSION		1
@@ -274,10 +276,12 @@ static void nsm_init_private(struct nsm_handle *nsm)
 {
 	u64 *p = (u64 *)&nsm->sm_priv.data;
 	struct timespec ts;
+	s64 ns;
 
 	ktime_get_ts(&ts);
-	*p++ = timespec_to_ns(&ts);
-	*p = (unsigned long)nsm;
+	ns = timespec_to_ns(&ts);
+	put_unaligned(ns, p);
+	put_unaligned((unsigned long)nsm, p + 1);
 }
 
 static struct nsm_handle *nsm_create_handle(const struct sockaddr *sap,

fs/lockd/svc.c

@@ -52,17 +52,6 @@ static struct task_struct	*nlmsvc_task;
 static struct svc_rqst		*nlmsvc_rqst;
 unsigned long			nlmsvc_timeout;
 
-/*
- * If the kernel has IPv6 support available, always listen for
- * both AF_INET and AF_INET6 requests.
- */
-#if (defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) && \
-	defined(CONFIG_SUNRPC_REGISTER_V4)
-static const sa_family_t	nlmsvc_family = AF_INET6;
-#else	/* (CONFIG_IPV6 || CONFIG_IPV6_MODULE) && CONFIG_SUNRPC_REGISTER_V4 */
-static const sa_family_t	nlmsvc_family = AF_INET;
-#endif	/* (CONFIG_IPV6 || CONFIG_IPV6_MODULE) && CONFIG_SUNRPC_REGISTER_V4 */
-
 /*
  * These can be set at insmod time (useful for NFS as root filesystem),
  * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
@@ -204,19 +193,30 @@ lockd(void *vrqstp)
 	return 0;
 }
 
-static int create_lockd_listener(struct svc_serv *serv, char *name,
-				 unsigned short port)
+static int create_lockd_listener(struct svc_serv *serv, const char *name,
+				 const int family, const unsigned short port)
 {
 	struct svc_xprt *xprt;
 
-	xprt = svc_find_xprt(serv, name, 0, 0);
+	xprt = svc_find_xprt(serv, name, family, 0);
 	if (xprt == NULL)
-		return svc_create_xprt(serv, name, port, SVC_SOCK_DEFAULTS);
-
+		return svc_create_xprt(serv, name, family, port,
+						SVC_SOCK_DEFAULTS);
 	svc_xprt_put(xprt);
 	return 0;
 }
 
+static int create_lockd_family(struct svc_serv *serv, const int family)
+{
+	int err;
+
+	err = create_lockd_listener(serv, "udp", family, nlm_udpport);
+	if (err < 0)
+		return err;
+
+	return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
+}
+
 /*
  * Ensure there are active UDP and TCP listeners for lockd.
  *
@@ -232,13 +232,15 @@ static int make_socks(struct svc_serv *serv)
 	static int warned;
 	int err;
 
-	err = create_lockd_listener(serv, "udp", nlm_udpport);
+	err = create_lockd_family(serv, PF_INET);
 	if (err < 0)
 		goto out_err;
 
-	err = create_lockd_listener(serv, "tcp", nlm_tcpport);
-	if (err < 0)
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	err = create_lockd_family(serv, PF_INET6);
+	if (err < 0 && err != -EAFNOSUPPORT)
 		goto out_err;
+#endif	/* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
 
 	warned = 0;
 	return 0;
@@ -274,7 +276,7 @@ int lockd_up(void)
 			"lockd_up: no pid, %d users??\n", nlmsvc_users);
 
 	error = -ENOMEM;
-	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, nlmsvc_family, NULL);
+	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
 	if (!serv) {
 		printk(KERN_WARNING "lockd_up: create service failed\n");
 		goto out;

fs/nfs/callback.c

@@ -38,19 +38,10 @@ static struct svc_program nfs4_callback_program;
 
 unsigned int nfs_callback_set_tcpport;
 unsigned short nfs_callback_tcpport;
+unsigned short nfs_callback_tcpport6;
 static const int nfs_set_port_min = 0;
 static const int nfs_set_port_max = 65535;
 
-/*
- * If the kernel has IPv6 support available, always listen for
- * both AF_INET and AF_INET6 requests.
- */
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static const sa_family_t	nfs_callback_family = AF_INET6;
-#else
-static const sa_family_t	nfs_callback_family = AF_INET;
-#endif
-
 static int param_set_port(const char *val, struct kernel_param *kp)
 {
 	char *endp;
@@ -116,19 +107,29 @@ int nfs_callback_up(void)
 	mutex_lock(&nfs_callback_mutex);
 	if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
 		goto out;
-	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE,
-				nfs_callback_family, NULL);
+	serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
 	ret = -ENOMEM;
 	if (!serv)
 		goto out_err;
 
-	ret = svc_create_xprt(serv, "tcp", nfs_callback_set_tcpport,
-			      SVC_SOCK_ANONYMOUS);
+	ret = svc_create_xprt(serv, "tcp", PF_INET,
+				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
 	if (ret <= 0)
 		goto out_err;
 	nfs_callback_tcpport = ret;
 	dprintk("NFS: Callback listener port = %u (af %u)\n",
-			nfs_callback_tcpport, nfs_callback_family);
+			nfs_callback_tcpport, PF_INET);
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	ret = svc_create_xprt(serv, "tcp", PF_INET6,
+				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
+	if (ret > 0) {
+		nfs_callback_tcpport6 = ret;
+		dprintk("NFS: Callback listener port = %u (af %u)\n",
+				nfs_callback_tcpport6, PF_INET6);
+	} else if (ret != -EAFNOSUPPORT)
+		goto out_err;
+#endif	/* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 
 	nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
 	if (IS_ERR(nfs_callback_info.rqst)) {

fs/nfs/callback.h

@@ -72,5 +72,6 @@ extern void nfs_callback_down(void);
 
 extern unsigned int nfs_callback_set_tcpport;
 extern unsigned short nfs_callback_tcpport;
+extern unsigned short nfs_callback_tcpport6;
 
 #endif /* __LINUX_FS_NFS_CALLBACK_H */

fs/nfs/client.c

@@ -224,38 +224,6 @@ void nfs_put_client(struct nfs_client *clp)
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static const struct in6_addr *nfs_map_ipv4_addr(const struct sockaddr *sa, struct in6_addr *addr_mapped)
-{
-	switch (sa->sa_family) {
-		default:
-			return NULL;
-		case AF_INET6:
-			return &((const struct sockaddr_in6 *)sa)->sin6_addr;
-			break;
-		case AF_INET:
-			ipv6_addr_set_v4mapped(((const struct sockaddr_in *)sa)->sin_addr.s_addr,
-					addr_mapped);
-			return addr_mapped;
-	}
-}
-
-static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
-		const struct sockaddr *sa2)
-{
-	const struct in6_addr *addr1;
-	const struct in6_addr *addr2;
-	struct in6_addr addr1_mapped;
-	struct in6_addr addr2_mapped;
-
-	addr1 = nfs_map_ipv4_addr(sa1, &addr1_mapped);
-	if (likely(addr1 != NULL)) {
-		addr2 = nfs_map_ipv4_addr(sa2, &addr2_mapped);
-		if (likely(addr2 != NULL))
-			return ipv6_addr_equal(addr1, addr2);
-	}
-	return 0;
-}
-
 /*
  * Test if two ip6 socket addresses refer to the same socket by
  * comparing relevant fields. The padding bytes specifically, are not
@@ -267,38 +235,21 @@ static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
  *
  * The caller should ensure both socket addresses are AF_INET6.
  */
-static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
-				const struct sockaddr *sa2)
+static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
+				      const struct sockaddr *sa2)
 {
-	const struct sockaddr_in6 *saddr1 = (const struct sockaddr_in6 *)sa1;
-	const struct sockaddr_in6 *saddr2 = (const struct sockaddr_in6 *)sa2;
+	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
+	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
 
-	if (!ipv6_addr_equal(&saddr1->sin6_addr,
-			     &saddr1->sin6_addr))
+	if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
+	    sin1->sin6_scope_id != sin2->sin6_scope_id)
 		return 0;
-	if (ipv6_addr_scope(&saddr1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL &&
-	    saddr1->sin6_scope_id != saddr2->sin6_scope_id)
-		return 0;
-	return saddr1->sin6_port == saddr2->sin6_port;
-}
-#else
-static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1,
-				 const struct sockaddr_in *sa2)
-{
-	return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr;
-}
 
-static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
-				 const struct sockaddr *sa2)
-{
-	if (unlikely(sa1->sa_family != AF_INET || sa2->sa_family != AF_INET))
-		return 0;
-	return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1,
-			(const struct sockaddr_in *)sa2);
+	return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr);
 }
-
-static int nfs_sockaddr_cmp_ip6(const struct sockaddr * sa1,
-				const struct sockaddr * sa2)
+#else	/* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
+static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1,
+				      const struct sockaddr *sa2)
 {
 	return 0;
 }
@@ -311,20 +262,57 @@ static int nfs_sockaddr_cmp_ip6(const struct sockaddr * sa1,
  *
  * The caller should ensure both socket addresses are AF_INET.
  */
+static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1,
+				      const struct sockaddr *sa2)
+{
+	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
+	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
+
+	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
+}
+
+static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1,
+				const struct sockaddr *sa2)
+{
+	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
+	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
+
+	return nfs_sockaddr_match_ipaddr6(sa1, sa2) &&
+		(sin1->sin6_port == sin2->sin6_port);
+}
+
 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1,
 				const struct sockaddr *sa2)
 {
-	const struct sockaddr_in *saddr1 = (const struct sockaddr_in *)sa1;
-	const struct sockaddr_in *saddr2 = (const struct sockaddr_in *)sa2;
+	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
+	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
 
-	if (saddr1->sin_addr.s_addr != saddr2->sin_addr.s_addr)
+	return nfs_sockaddr_match_ipaddr4(sa1, sa2) &&
+		(sin1->sin_port == sin2->sin_port);
+}
+
+/*
+ * Test if two socket addresses represent the same actual socket,
+ * by comparing (only) relevant fields, excluding the port number.
+ */
+static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1,
+				     const struct sockaddr *sa2)
+{
+	if (sa1->sa_family != sa2->sa_family)
 		return 0;
-	return saddr1->sin_port == saddr2->sin_port;
+
+	switch (sa1->sa_family) {
+	case AF_INET:
+		return nfs_sockaddr_match_ipaddr4(sa1, sa2);
+	case AF_INET6:
+		return nfs_sockaddr_match_ipaddr6(sa1, sa2);
+	}
+	return 0;
 }
 
 /*
  * Test if two socket addresses represent the same actual socket,
- * by comparing (only) relevant fields.
+ * by comparing (only) relevant fields, including the port number.
  */
 static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
 			    const struct sockaddr *sa2)

fs/nfs/dir.c

@@ -1624,8 +1624,7 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		} else if (atomic_read(&new_dentry->d_count) > 1)
 			/* dentry still busy? */
 			goto out;
-	} else
-		nfs_drop_nlink(new_inode);
+	}
 
 go_ahead:
 	/*
@@ -1638,10 +1637,8 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	}
 	nfs_inode_return_delegation(old_inode);
 
-	if (new_inode != NULL) {
+	if (new_inode != NULL)
 		nfs_inode_return_delegation(new_inode);
-		d_delete(new_dentry);
-	}
 
 	error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
 					   new_dir, &new_dentry->d_name);
@@ -1650,6 +1647,8 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (rehash)
 		d_rehash(rehash);
 	if (!error) {
+		if (new_inode != NULL)
+			nfs_drop_nlink(new_inode);
 		d_move(old_dentry, new_dentry);
 		nfs_set_verifier(new_dentry,
 					nfs_save_change_attribute(new_dir));

fs/nfs/file.c

@@ -64,11 +64,7 @@ const struct file_operations nfs_file_operations = {
 	.write		= do_sync_write,
 	.aio_read	= nfs_file_read,
 	.aio_write	= nfs_file_write,
-#ifdef CONFIG_MMU
 	.mmap		= nfs_file_mmap,
-#else
-	.mmap		= generic_file_mmap,
-#endif
 	.open		= nfs_file_open,
 	.flush		= nfs_file_flush,
 	.release	= nfs_file_release,
@@ -141,9 +137,6 @@ nfs_file_release(struct inode *inode, struct file *filp)
 			dentry->d_parent->d_name.name,
 			dentry->d_name.name);
 
-	/* Ensure that dirty pages are flushed out with the right creds */
-	if (filp->f_mode & FMODE_WRITE)
-		nfs_wb_all(dentry->d_inode);
 	nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
 	return nfs_release(inode, filp);
 }
@@ -235,7 +228,6 @@ nfs_file_flush(struct file *file, fl_owner_t id)
 	struct nfs_open_context *ctx = nfs_file_open_context(file);
 	struct dentry	*dentry = file->f_path.dentry;
 	struct inode	*inode = dentry->d_inode;
-	int		status;
 
 	dprintk("NFS: flush(%s/%s)\n",
 			dentry->d_parent->d_name.name,
@@ -245,11 +237,8 @@ nfs_file_flush(struct file *file, fl_owner_t id)
 		return 0;
 	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
 
-	/* Ensure that data+attribute caches are up to date after close() */
-	status = nfs_do_fsync(ctx, inode);
-	if (!status)
-		nfs_revalidate_inode(NFS_SERVER(inode), inode);
-	return status;
+	/* Flush writes to the server and return any errors */
+	return nfs_do_fsync(ctx, inode);
 }
 
 static ssize_t
@@ -304,11 +293,13 @@ nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
 	dprintk("NFS: mmap(%s/%s)\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
-	status = nfs_revalidate_mapping(inode, file->f_mapping);
+	/* Note: generic_file_mmap() returns ENOSYS on nommu systems
+	 *       so we call that before revalidating the mapping
+	 */
+	status = generic_file_mmap(file, vma);
 	if (!status) {
 		vma->vm_ops = &nfs_file_vm_ops;
-		vma->vm_flags |= VM_CAN_NONLINEAR;
-		file_accessed(file);
+		status = nfs_revalidate_mapping(inode, file->f_mapping);
 	}
 	return status;
 }
@@ -354,6 +345,15 @@ static int nfs_write_begin(struct file *file, struct address_space *mapping,
 		file->f_path.dentry->d_name.name,
 		mapping->host->i_ino, len, (long long) pos);
 
+	/*
+	 * Prevent starvation issues if someone is doing a consistency
+	 * sync-to-disk
+	 */
+	ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
+			nfs_wait_bit_killable, TASK_KILLABLE);
+	if (ret)
+		return ret;
+
 	page = grab_cache_page_write_begin(mapping, index, flags);
 	if (!page)
 		return -ENOMEM;

fs/nfs/getroot.c

@@ -156,7 +156,7 @@ int nfs4_path_walk(struct nfs_server *server,
 		return ret;
 	}
 
-	if (fattr.type != NFDIR) {
+	if (!S_ISDIR(fattr.mode)) {
 		printk(KERN_ERR "nfs4_get_root:"
 		       " getroot encountered non-directory\n");
 		return -ENOTDIR;
@@ -213,7 +213,7 @@ int nfs4_path_walk(struct nfs_server *server,
 		return ret;
 	}
 
-	if (fattr.type != NFDIR) {
+	if (!S_ISDIR(fattr.mode)) {
 		printk(KERN_ERR "nfs4_get_root:"
 		       " lookupfh encountered non-directory\n");
 		return -ENOTDIR;

fs/nfs/internal.h

@@ -152,6 +152,9 @@ extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 extern struct rpc_procinfo nfs4_procedures[];
 #endif
 
+/* proc.c */
+void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
+
 /* dir.c */
 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 
@@ -165,6 +168,7 @@ extern void nfs_clear_inode(struct inode *);
 extern void nfs4_clear_inode(struct inode *);
 #endif
 void nfs_zap_acl_cache(struct inode *inode);
+extern int nfs_wait_bit_killable(void *word);
 
 /* super.c */
 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);

fs/nfs/nfs2xdr.c

@@ -120,8 +120,8 @@ xdr_decode_time(__be32 *p, struct timespec *timep)
 static __be32 *
 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
 {
-	u32 rdev;
-	fattr->type = (enum nfs_ftype) ntohl(*p++);
+	u32 rdev, type;
+	type = ntohl(*p++);
 	fattr->mode = ntohl(*p++);
 	fattr->nlink = ntohl(*p++);
 	fattr->uid = ntohl(*p++);
@@ -136,10 +136,9 @@ xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
 	p = xdr_decode_time(p, &fattr->atime);
 	p = xdr_decode_time(p, &fattr->mtime);
 	p = xdr_decode_time(p, &fattr->ctime);
-	fattr->valid |= NFS_ATTR_FATTR;
+	fattr->valid |= NFS_ATTR_FATTR_V2;
 	fattr->rdev = new_decode_dev(rdev);
-	if (fattr->type == NFCHR && rdev == NFS2_FIFO_DEV) {
-		fattr->type = NFFIFO;
+	if (type == NFCHR && rdev == NFS2_FIFO_DEV) {
 		fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
 		fattr->rdev = 0;
 	}

fs/nfs/nfs3proc.c

@@ -834,4 +834,5 @@ const struct nfs_rpc_ops nfs_v3_clientops = {
 	.commit_done	= nfs3_commit_done,
 	.lock		= nfs3_proc_lock,
 	.clear_acl_cache = nfs3_forget_cached_acls,
+	.close_context	= nfs_close_context,
 };

fs/nfs/nfs3xdr.c

@@ -91,19 +91,15 @@
 /*
  * Map file type to S_IFMT bits
  */
-static struct {
-	unsigned int	mode;
-	unsigned int	nfs2type;
-} nfs_type2fmt[] = {
-      { 0,		NFNON	},
-      { S_IFREG,	NFREG	},
-      { S_IFDIR,	NFDIR	},
-      { S_IFBLK,	NFBLK	},
-      { S_IFCHR,	NFCHR	},
-      { S_IFLNK,	NFLNK	},
-      { S_IFSOCK,	NFSOCK	},
-      { S_IFIFO,	NFFIFO	},
-      { 0,		NFBAD	}
+static const umode_t nfs_type2fmt[] = {
+	[NF3BAD] = 0,
+	[NF3REG] = S_IFREG,
+	[NF3DIR] = S_IFDIR,
+	[NF3BLK] = S_IFBLK,
+	[NF3CHR] = S_IFCHR,
+	[NF3LNK] = S_IFLNK,
+	[NF3SOCK] = S_IFSOCK,
+	[NF3FIFO] = S_IFIFO,
 };
 
 /*
@@ -148,13 +144,12 @@ static __be32 *
 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
 {
 	unsigned int	type, major, minor;
-	int		fmode;
+	umode_t		fmode;
 
 	type = ntohl(*p++);
-	if (type >= NF3BAD)
-		type = NF3BAD;
-	fmode = nfs_type2fmt[type].mode;
-	fattr->type = nfs_type2fmt[type].nfs2type;
+	if (type > NF3FIFO)
+		type = NF3NON;
+	fmode = nfs_type2fmt[type];
 	fattr->mode = (ntohl(*p++) & ~S_IFMT) | fmode;
 	fattr->nlink = ntohl(*p++);
 	fattr->uid = ntohl(*p++);
@@ -177,7 +172,7 @@ xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
 	p = xdr_decode_time3(p, &fattr->ctime);
 
 	/* Update the mode bits */
-	fattr->valid |= (NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3);
+	fattr->valid |= NFS_ATTR_FATTR_V3;
 	return p;
 }
 
@@ -233,7 +228,9 @@ xdr_decode_wcc_attr(__be32 *p, struct nfs_fattr *fattr)
 	p = xdr_decode_hyper(p, &fattr->pre_size);
 	p = xdr_decode_time3(p, &fattr->pre_mtime);
 	p = xdr_decode_time3(p, &fattr->pre_ctime);
-	fattr->valid |= NFS_ATTR_WCC;
+	fattr->valid |= NFS_ATTR_FATTR_PRESIZE
+		| NFS_ATTR_FATTR_PREMTIME
+		| NFS_ATTR_FATTR_PRECTIME;
 	return p;
 }
 

fs/nfs/nfs4proc.c

@@ -193,14 +193,6 @@ static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dent
 	kunmap_atomic(start, KM_USER0);
 }
 
-static int nfs4_wait_bit_killable(void *word)
-{
-	if (fatal_signal_pending(current))
-		return -ERESTARTSYS;
-	schedule();
-	return 0;
-}
-
 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 {
 	int res;
@@ -208,7 +200,7 @@ static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 	might_sleep();
 
 	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
-			nfs4_wait_bit_killable, TASK_KILLABLE);
+			nfs_wait_bit_killable, TASK_KILLABLE);
 	return res;
 }
 
@@ -1439,7 +1431,7 @@ int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
 	if (calldata->arg.seqid == NULL)
 		goto out_free_calldata;
 	calldata->arg.fmode = 0;
-	calldata->arg.bitmask = server->attr_bitmask;
+	calldata->arg.bitmask = server->cache_consistency_bitmask;
 	calldata->res.fattr = &calldata->fattr;
 	calldata->res.seqid = calldata->arg.seqid;
 	calldata->res.server = server;
@@ -1580,6 +1572,15 @@ nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, st
 	return 0;
 }
 
+void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
+{
+	if (ctx->state == NULL)
+		return;
+	if (is_sync)
+		nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
+	else
+		nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
+}
 
 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 {
@@ -1600,6 +1601,9 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
 			server->caps |= NFS_CAP_HARDLINKS;
 		if (res.has_symlinks != 0)
 			server->caps |= NFS_CAP_SYMLINKS;
+		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
+		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
+		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
 		server->acl_bitmask = res.acl_bitmask;
 	}
 	return status;
@@ -2079,7 +2083,7 @@ static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 	struct nfs_removeargs *args = msg->rpc_argp;
 	struct nfs_removeres *res = msg->rpc_resp;
 
-	args->bitmask = server->attr_bitmask;
+	args->bitmask = server->cache_consistency_bitmask;
 	res->server = server;
 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
 }
@@ -2323,7 +2327,7 @@ static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
 		.pages = &page,
 		.pgbase = 0,
 		.count = count,
-		.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
+		.bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
 	};
 	struct nfs4_readdir_res res;
 	struct rpc_message msg = {
@@ -2552,7 +2556,7 @@ static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_messag
 {
 	struct nfs_server *server = NFS_SERVER(data->inode);
 
-	data->args.bitmask = server->attr_bitmask;
+	data->args.bitmask = server->cache_consistency_bitmask;
 	data->res.server = server;
 	data->timestamp   = jiffies;
 
@@ -2575,7 +2579,7 @@ static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_messa
 {
 	struct nfs_server *server = NFS_SERVER(data->inode);
 	
-	data->args.bitmask = server->attr_bitmask;
+	data->args.bitmask = server->cache_consistency_bitmask;
 	data->res.server = server;
 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
 }
@@ -3678,6 +3682,19 @@ ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
 	return len;
 }
 
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
+{
+	if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
+		(fattr->valid & NFS_ATTR_FATTR_FSID) &&
+		(fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
+		return;
+
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 		struct nfs4_fs_locations *fs_locations, struct page *page)
 {
@@ -3704,6 +3721,7 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 	fs_locations->server = server;
 	fs_locations->nlocations = 0;
 	status = rpc_call_sync(server->client, &msg, 0);
+	nfs_fixup_referral_attributes(&fs_locations->fattr);
 	dprintk("%s: returned status = %d\n", __func__, status);
 	return status;
 }
@@ -3767,6 +3785,7 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
 	.commit_done	= nfs4_commit_done,
 	.lock		= nfs4_proc_lock,
 	.clear_acl_cache = nfs4_zap_acl_attr,
+	.close_context  = nfs4_close_context,
 };
 
 /*

fs/nfs/nfs4state.c

@@ -62,8 +62,14 @@ static LIST_HEAD(nfs4_clientid_list);
 
 static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
 {
-	int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
-			nfs_callback_tcpport, cred);
+	unsigned short port;
+	int status;
+
+	port = nfs_callback_tcpport;
+	if (clp->cl_addr.ss_family == AF_INET6)
+		port = nfs_callback_tcpport6;
+
+	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred);
 	if (status == 0)
 		status = nfs4_proc_setclientid_confirm(clp, cred);
 	if (status == 0)

fs/nfs/pagelist.c

@@ -176,17 +176,6 @@ void nfs_release_request(struct nfs_page *req)
 	kref_put(&req->wb_kref, nfs_free_request);
 }
 
-static int nfs_wait_bit_killable(void *word)
-{
-	int ret = 0;
-
-	if (fatal_signal_pending(current))
-		ret = -ERESTARTSYS;
-	else
-		schedule();
-	return ret;
-}
-
 /**
  * nfs_wait_on_request - Wait for a request to complete.
  * @req: request to wait upon.

fs/nfs/proc.c

@@ -663,4 +663,5 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
 	.commit_setup	= nfs_proc_commit_setup,
 	.lock		= nfs_proc_lock,
 	.lock_check_bounds = nfs_lock_check_bounds,
+	.close_context	= nfs_close_context,
 };

fs/nfs/super.c

@@ -1018,6 +1018,7 @@ static int nfs_parse_mount_options(char *raw,
 		case Opt_rdma:
 			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
 			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+			xprt_load_transport(p);
 			break;
 		case Opt_acl:
 			mnt->flags &= ~NFS_MOUNT_NOACL;
@@ -1205,12 +1206,14 @@ static int nfs_parse_mount_options(char *raw,
 				/* vector side protocols to TCP */
 				mnt->flags |= NFS_MOUNT_TCP;
 				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+				xprt_load_transport(string);
 				break;
 			default:
 				errors++;
 				dfprintk(MOUNT, "NFS:   unrecognized "
 						"transport protocol\n");
 			}
+			kfree(string);
 			break;
 		case Opt_mountproto:
 			string = match_strdup(args);
@@ -1218,7 +1221,6 @@ static int nfs_parse_mount_options(char *raw,
 				goto out_nomem;
 			token = match_token(string,
 					    nfs_xprt_protocol_tokens, args);
-			kfree(string);
 
 			switch (token) {
 			case Opt_xprt_udp:

fs/nfs/write.c

@@ -313,19 +313,34 @@ static int nfs_writepages_callback(struct page *page, struct writeback_control *
 int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
 	struct inode *inode = mapping->host;
+	unsigned long *bitlock = &NFS_I(inode)->flags;
 	struct nfs_pageio_descriptor pgio;
 	int err;
 
+	/* Stop dirtying of new pages while we sync */
+	err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
+			nfs_wait_bit_killable, TASK_KILLABLE);
+	if (err)
+		goto out_err;
+
 	nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
 
 	nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
 	err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
 	nfs_pageio_complete(&pgio);
+
+	clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
+	smp_mb__after_clear_bit();
+	wake_up_bit(bitlock, NFS_INO_FLUSHING);
+
 	if (err < 0)
-		return err;
-	if (pgio.pg_error < 0)
-		return pgio.pg_error;
+		goto out_err;
+	err = pgio.pg_error;
+	if (err < 0)
+		goto out_err;
 	return 0;
+out_err:
+	return err;
 }
 
 /*
@@ -404,7 +419,6 @@ nfs_mark_request_commit(struct nfs_page *req)
 	struct nfs_inode *nfsi = NFS_I(inode);
 
 	spin_lock(&inode->i_lock);
-	nfsi->ncommit++;
 	set_bit(PG_CLEAN, &(req)->wb_flags);
 	radix_tree_tag_set(&nfsi->nfs_page_tree,
 			req->wb_index,
@@ -524,6 +538,12 @@ static void nfs_cancel_commit_list(struct list_head *head)
 }
 
 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
+static int
+nfs_need_commit(struct nfs_inode *nfsi)
+{
+	return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT);
+}
+
 /*
  * nfs_scan_commit - Scan an inode for commit requests
  * @inode: NFS inode to scan
@@ -538,16 +558,18 @@ static int
 nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
-	int res = 0;
 
-	if (nfsi->ncommit != 0) {
-		res = nfs_scan_list(nfsi, dst, idx_start, npages,
-				NFS_PAGE_TAG_COMMIT);
-		nfsi->ncommit -= res;
-	}
-	return res;
+	if (!nfs_need_commit(nfsi))
+		return 0;
+
+	return nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT);
 }
 #else
+static inline int nfs_need_commit(struct nfs_inode *nfsi)
+{
+	return 0;
+}
+
 static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
 {
 	return 0;
@@ -820,7 +842,7 @@ static int nfs_write_rpcsetup(struct nfs_page *req,
 	data->args.stable  = NFS_UNSTABLE;
 	if (how & FLUSH_STABLE) {
 		data->args.stable = NFS_DATA_SYNC;
-		if (!NFS_I(inode)->ncommit)
+		if (!nfs_need_commit(NFS_I(inode)))
 			data->args.stable = NFS_FILE_SYNC;
 	}
 
@@ -1425,18 +1447,13 @@ static int nfs_write_mapping(struct address_space *mapping, int how)
 {
 	struct writeback_control wbc = {
 		.bdi = mapping->backing_dev_info,
-		.sync_mode = WB_SYNC_NONE,
+		.sync_mode = WB_SYNC_ALL,
 		.nr_to_write = LONG_MAX,
 		.range_start = 0,
 		.range_end = LLONG_MAX,
 		.for_writepages = 1,
 	};
-	int ret;
 
-	ret = __nfs_write_mapping(mapping, &wbc, how);
-	if (ret < 0)
-		return ret;
-	wbc.sync_mode = WB_SYNC_ALL;
 	return __nfs_write_mapping(mapping, &wbc, how);
 }
 

fs/nfsd/nfsctl.c

@@ -938,10 +938,12 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 		char transport[16];
 		int port;
 		if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
+			if (port < 1 || port > 65535)
+				return -EINVAL;
 			err = nfsd_create_serv();
 			if (!err) {
 				err = svc_create_xprt(nfsd_serv,
-						      transport, port,
+						      transport, PF_INET, port,
 						      SVC_SOCK_ANONYMOUS);
 				if (err == -ENOENT)
 					/* Give a reasonable perror msg for
@@ -960,7 +962,7 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
 		char transport[16];
 		int port;
 		if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
-			if (port == 0)
+			if (port < 1 || port > 65535)
 				return -EINVAL;
 			if (nfsd_serv) {
 				xprt = svc_find_xprt(nfsd_serv, transport,

fs/nfsd/nfssvc.c

@@ -229,7 +229,6 @@ int nfsd_create_serv(void)
 
 	atomic_set(&nfsd_busy, 0);
 	nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
-				      AF_INET,
 				      nfsd_last_thread, nfsd, THIS_MODULE);
 	if (nfsd_serv == NULL)
 		err = -ENOMEM;
@@ -244,7 +243,7 @@ static int nfsd_init_socks(int port)
 	if (!list_empty(&nfsd_serv->sv_permsocks))
 		return 0;
 
-	error = svc_create_xprt(nfsd_serv, "udp", port,
+	error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port,
 					SVC_SOCK_DEFAULTS);
 	if (error < 0)
 		return error;
@@ -253,7 +252,7 @@ static int nfsd_init_socks(int port)
 	if (error < 0)
 		return error;
 
-	error = svc_create_xprt(nfsd_serv, "tcp", port,
+	error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port,
 					SVC_SOCK_DEFAULTS);
 	if (error < 0)
 		return error;

include/linux/nfs_fs.h

@@ -166,8 +166,7 @@ struct nfs_inode {
 	 */
 	struct radix_tree_root	nfs_page_tree;
 
-	unsigned long		ncommit,
-				npages;
+	unsigned long		npages;
 
 	/* Open contexts for shared mmap writes */
 	struct list_head	open_files;
@@ -207,6 +206,7 @@ struct nfs_inode {
 #define NFS_INO_STALE		(1)		/* possible stale inode */
 #define NFS_INO_ACL_LRU_SET	(2)		/* Inode is on the LRU list */
 #define NFS_INO_MOUNTPOINT	(3)		/* inode is remote mountpoint */
+#define NFS_INO_FLUSHING	(4)		/* inode is flushing out data */
 
 static inline struct nfs_inode *NFS_I(const struct inode *inode)
 {

include/linux/nfs_fs_sb.h

@@ -106,6 +106,11 @@ struct nfs_server {
 	u32			attr_bitmask[2];/* V4 bitmask representing the set
 						   of attributes supported on this
 						   filesystem */
+	u32			cache_consistency_bitmask[2];
+						/* V4 bitmask representing the subset
+						   of change attribute, size, ctime
+						   and mtime attributes supported by
+						   the server */
 	u32			acl_bitmask;	/* V4 bitmask representing the ACEs
 						   that are supported on this
 						   filesystem */

include/linux/nfs_xdr.h

@@ -27,12 +27,8 @@ static inline int nfs_fsid_equal(const struct nfs_fsid *a, const struct nfs_fsid
 }
 
 struct nfs_fattr {
-	unsigned short		valid;		/* which fields are valid */
-	__u64			pre_size;	/* pre_op_attr.size	  */
-	struct timespec		pre_mtime;	/* pre_op_attr.mtime	  */
-	struct timespec		pre_ctime;	/* pre_op_attr.ctime	  */
-	enum nfs_ftype		type;		/* always use NFSv2 types */
-	__u32			mode;
+	unsigned int		valid;		/* which fields are valid */
+	umode_t			mode;
 	__u32			nlink;
 	__u32			uid;
 	__u32			gid;
@@ -52,19 +48,55 @@ struct nfs_fattr {
 	struct timespec		atime;
 	struct timespec		mtime;
 	struct timespec		ctime;
-	__u32			bitmap[2];	/* NFSv4 returned attribute bitmap */
 	__u64			change_attr;	/* NFSv4 change attribute */
 	__u64			pre_change_attr;/* pre-op NFSv4 change attribute */
+	__u64			pre_size;	/* pre_op_attr.size	  */
+	struct timespec		pre_mtime;	/* pre_op_attr.mtime	  */
+	struct timespec		pre_ctime;	/* pre_op_attr.ctime	  */
 	unsigned long		time_start;
 	unsigned long		gencount;
 };
 
-#define NFS_ATTR_WCC		0x0001		/* pre-op WCC data    */
-#define NFS_ATTR_FATTR		0x0002		/* post-op attributes */
-#define NFS_ATTR_FATTR_V3	0x0004		/* NFSv3 attributes */
-#define NFS_ATTR_FATTR_V4	0x0008		/* NFSv4 change attribute */
-#define NFS_ATTR_WCC_V4		0x0010		/* pre-op change attribute */
-#define NFS_ATTR_FATTR_V4_REFERRAL	0x0020		/* NFSv4 referral */
+#define NFS_ATTR_FATTR_TYPE		(1U << 0)
+#define NFS_ATTR_FATTR_MODE		(1U << 1)
+#define NFS_ATTR_FATTR_NLINK		(1U << 2)
+#define NFS_ATTR_FATTR_OWNER		(1U << 3)
+#define NFS_ATTR_FATTR_GROUP		(1U << 4)
+#define NFS_ATTR_FATTR_RDEV		(1U << 5)
+#define NFS_ATTR_FATTR_SIZE		(1U << 6)
+#define NFS_ATTR_FATTR_PRESIZE		(1U << 7)
+#define NFS_ATTR_FATTR_BLOCKS_USED	(1U << 8)
+#define NFS_ATTR_FATTR_SPACE_USED	(1U << 9)
+#define NFS_ATTR_FATTR_FSID		(1U << 10)
+#define NFS_ATTR_FATTR_FILEID		(1U << 11)
+#define NFS_ATTR_FATTR_ATIME		(1U << 12)
+#define NFS_ATTR_FATTR_MTIME		(1U << 13)
+#define NFS_ATTR_FATTR_CTIME		(1U << 14)
+#define NFS_ATTR_FATTR_PREMTIME		(1U << 15)
+#define NFS_ATTR_FATTR_PRECTIME		(1U << 16)
+#define NFS_ATTR_FATTR_CHANGE		(1U << 17)
+#define NFS_ATTR_FATTR_PRECHANGE	(1U << 18)
+#define NFS_ATTR_FATTR_V4_REFERRAL	(1U << 19)	/* NFSv4 referral */
+
+#define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
+		| NFS_ATTR_FATTR_MODE \
+		| NFS_ATTR_FATTR_NLINK \
+		| NFS_ATTR_FATTR_OWNER \
+		| NFS_ATTR_FATTR_GROUP \
+		| NFS_ATTR_FATTR_RDEV \
+		| NFS_ATTR_FATTR_SIZE \
+		| NFS_ATTR_FATTR_FSID \
+		| NFS_ATTR_FATTR_FILEID \
+		| NFS_ATTR_FATTR_ATIME \
+		| NFS_ATTR_FATTR_MTIME \
+		| NFS_ATTR_FATTR_CTIME)
+#define NFS_ATTR_FATTR_V2 (NFS_ATTR_FATTR \
+		| NFS_ATTR_FATTR_BLOCKS_USED)
+#define NFS_ATTR_FATTR_V3 (NFS_ATTR_FATTR \
+		| NFS_ATTR_FATTR_SPACE_USED)
+#define NFS_ATTR_FATTR_V4 (NFS_ATTR_FATTR \
+		| NFS_ATTR_FATTR_SPACE_USED \
+		| NFS_ATTR_FATTR_CHANGE)
 
 /*
  * Info on the file system
@@ -836,6 +868,7 @@ struct nfs_rpc_ops {
 	int	(*lock)(struct file *, int, struct file_lock *);
 	int	(*lock_check_bounds)(const struct file_lock *);
 	void	(*clear_acl_cache)(struct inode *);
+	void	(*close_context)(struct nfs_open_context *ctx, int);
 };
 
 /*

include/linux/sunrpc/svc.h

@@ -69,7 +69,6 @@ struct svc_serv {
 	struct list_head	sv_tempsocks;	/* all temporary sockets */
 	int			sv_tmpcnt;	/* count of temporary sockets */
 	struct timer_list	sv_temptimer;	/* timer for aging temporary sockets */
-	sa_family_t		sv_family;	/* listener's address family */
 
 	char *			sv_name;	/* service name */
 
@@ -385,19 +384,19 @@ struct svc_procedure {
 /*
  * Function prototypes.
  */
-struct svc_serv *svc_create(struct svc_program *, unsigned int, sa_family_t,
+struct svc_serv *svc_create(struct svc_program *, unsigned int,
 			    void (*shutdown)(struct svc_serv *));
 struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
 					struct svc_pool *pool);
 void		   svc_exit_thread(struct svc_rqst *);
 struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
-			sa_family_t, void (*shutdown)(struct svc_serv *),
+			void (*shutdown)(struct svc_serv *),
 			svc_thread_fn, struct module *);
 int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
 void		   svc_destroy(struct svc_serv *);
 int		   svc_process(struct svc_rqst *);
-int		   svc_register(const struct svc_serv *, const unsigned short,
-				const unsigned short);
+int		   svc_register(const struct svc_serv *, const int,
+				const unsigned short, const unsigned short);
 
 void		   svc_wake_up(struct svc_serv *);
 void		   svc_reserve(struct svc_rqst *rqstp, int space);

include/linux/sunrpc/svc_xprt.h

@@ -71,7 +71,8 @@ int	svc_reg_xprt_class(struct svc_xprt_class *);
 void	svc_unreg_xprt_class(struct svc_xprt_class *);
 void	svc_xprt_init(struct svc_xprt_class *, struct svc_xprt *,
 		      struct svc_serv *);
-int	svc_create_xprt(struct svc_serv *, char *, unsigned short, int);
+int	svc_create_xprt(struct svc_serv *, const char *, const int,
+			const unsigned short, int);
 void	svc_xprt_enqueue(struct svc_xprt *xprt);
 void	svc_xprt_received(struct svc_xprt *);
 void	svc_xprt_put(struct svc_xprt *xprt);
@@ -80,7 +81,8 @@ void	svc_close_xprt(struct svc_xprt *xprt);
 void	svc_delete_xprt(struct svc_xprt *xprt);
 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 *, char *, int, int);
+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);
 
 static inline void svc_xprt_get(struct svc_xprt *xprt)
@@ -88,29 +90,32 @@ static inline void svc_xprt_get(struct svc_xprt *xprt)
 	kref_get(&xprt->xpt_ref);
 }
 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
-				      struct sockaddr *sa, int salen)
+				      const struct sockaddr *sa,
+				      const size_t salen)
 {
 	memcpy(&xprt->xpt_local, sa, salen);
 	xprt->xpt_locallen = salen;
 }
 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
-				       struct sockaddr *sa, int salen)
+				       const struct sockaddr *sa,
+				       const size_t salen)
 {
 	memcpy(&xprt->xpt_remote, sa, salen);
 	xprt->xpt_remotelen = salen;
 }
-static inline unsigned short svc_addr_port(struct sockaddr *sa)
+static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 {
-	unsigned short ret = 0;
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
+
 	switch (sa->sa_family) {
 	case AF_INET:
-		ret = ntohs(((struct sockaddr_in *)sa)->sin_port);
-		break;
+		return ntohs(sin->sin_port);
 	case AF_INET6:
-		ret = ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
-		break;
+		return ntohs(sin6->sin6_port);
 	}
-	return ret;
+
+	return 0;
 }
 
 static inline size_t svc_addr_len(struct sockaddr *sa)
@@ -124,36 +129,39 @@ static inline size_t svc_addr_len(struct sockaddr *sa)
 	return -EAFNOSUPPORT;
 }
 
-static inline unsigned short svc_xprt_local_port(struct svc_xprt *xprt)
+static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 {
-	return svc_addr_port((struct sockaddr *)&xprt->xpt_local);
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 }
 
-static inline unsigned short svc_xprt_remote_port(struct svc_xprt *xprt)
+static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 {
-	return svc_addr_port((struct sockaddr *)&xprt->xpt_remote);
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 }
 
-static inline char *__svc_print_addr(struct sockaddr *addr,
-				     char *buf, size_t len)
+static inline char *__svc_print_addr(const struct sockaddr *addr,
+				     char *buf, const size_t len)
 {
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
+
 	switch (addr->sa_family) {
 	case AF_INET:
-		snprintf(buf, len, "%pI4, port=%u",
-			&((struct sockaddr_in *)addr)->sin_addr,
-			ntohs(((struct sockaddr_in *) addr)->sin_port));
+		snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
+			ntohs(sin->sin_port));
 		break;
 
 	case AF_INET6:
 		snprintf(buf, len, "%pI6, port=%u",
-			 &((struct sockaddr_in6 *)addr)->sin6_addr,
-			ntohs(((struct sockaddr_in6 *) addr)->sin6_port));
+			 &sin6->sin6_addr,
+			ntohs(sin6->sin6_port));
 		break;
 
 	default:
 		snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 		break;
 	}
+
 	return buf;
 }
 #endif /* SUNRPC_SVC_XPRT_H */

include/linux/sunrpc/xprt.h

@@ -235,6 +235,7 @@ static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *
  */
 int			xprt_register_transport(struct xprt_class *type);
 int			xprt_unregister_transport(struct xprt_class *type);
+int			xprt_load_transport(const char *);
 void			xprt_set_retrans_timeout_def(struct rpc_task *task);
 void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
 void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
@@ -259,6 +260,7 @@ void			xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
 #define XPRT_BOUND		(4)
 #define XPRT_BINDING		(5)
 #define XPRT_CLOSING		(6)
+#define XPRT_CONNECTION_ABORT	(7)
 
 static inline void xprt_set_connected(struct rpc_xprt *xprt)
 {

net/sunrpc/Kconfig

@@ -17,28 +17,6 @@ config SUNRPC_XPRT_RDMA
 
 	  If unsure, say N.
 
-config SUNRPC_REGISTER_V4
-	bool "Register local RPC services via rpcbind v4 (EXPERIMENTAL)"
-	depends on SUNRPC && EXPERIMENTAL
-	default n
-	help
-	  Sun added support for registering RPC services at an IPv6
-	  address by creating two new versions of the rpcbind protocol
-	  (RFC 1833).
-
-	  This option enables support in the kernel RPC server for
-	  registering kernel RPC services via version 4 of the rpcbind
-	  protocol.  If you enable this option, you must run a portmapper
-	  daemon that supports rpcbind protocol version 4.
-
-	  Serving NFS over IPv6 from knfsd (the kernel's NFS server)
-	  requires that you enable this option and use a portmapper that
-	  supports rpcbind version 4.
-
-	  If unsure, say N to get traditional behavior (register kernel
-	  RPC services using only rpcbind version 2).  Distributions
-	  using the legacy Linux portmapper daemon must say N here.
-
 config RPCSEC_GSS_KRB5
 	tristate "Secure RPC: Kerberos V mechanism (EXPERIMENTAL)"
 	depends on SUNRPC && EXPERIMENTAL

net/sunrpc/clnt.c

@@ -1032,27 +1032,20 @@ call_connect_status(struct rpc_task *task)
 	dprint_status(task);
 
 	task->tk_status = 0;
-	if (status >= 0) {
+	if (status >= 0 || status == -EAGAIN) {
 		clnt->cl_stats->netreconn++;
 		task->tk_action = call_transmit;
 		return;
 	}
 
-	/* Something failed: remote service port may have changed */
-	rpc_force_rebind(clnt);
-
 	switch (status) {
-	case -ENOTCONN:
-	case -EAGAIN:
-		task->tk_action = call_bind;
-		if (!RPC_IS_SOFT(task))
-			return;
 		/* if soft mounted, test if we've timed out */
 	case -ETIMEDOUT:
 		task->tk_action = call_timeout;
-		return;
+		break;
+	default:
+		rpc_exit(task, -EIO);
 	}
-	rpc_exit(task, -EIO);
 }
 
 /*
@@ -1105,14 +1098,26 @@ static void
 call_transmit_status(struct rpc_task *task)
 {
 	task->tk_action = call_status;
-	/*
-	 * Special case: if we've been waiting on the socket's write_space()
-	 * callback, then don't call xprt_end_transmit().
-	 */
-	if (task->tk_status == -EAGAIN)
-		return;
-	xprt_end_transmit(task);
-	rpc_task_force_reencode(task);
+	switch (task->tk_status) {
+	case -EAGAIN:
+		break;
+	default:
+		xprt_end_transmit(task);
+		/*
+		 * Special cases: if we've been waiting on the
+		 * socket's write_space() callback, or if the
+		 * socket just returned a connection error,
+		 * then hold onto the transport lock.
+		 */
+	case -ECONNREFUSED:
+	case -ECONNRESET:
+	case -ENOTCONN:
+	case -EHOSTDOWN:
+	case -EHOSTUNREACH:
+	case -ENETUNREACH:
+	case -EPIPE:
+		rpc_task_force_reencode(task);
+	}
 }
 
 /*
@@ -1152,9 +1157,12 @@ call_status(struct rpc_task *task)
 			xprt_conditional_disconnect(task->tk_xprt,
 					req->rq_connect_cookie);
 		break;
+	case -ECONNRESET:
 	case -ECONNREFUSED:
-	case -ENOTCONN:
 		rpc_force_rebind(clnt);
+		rpc_delay(task, 3*HZ);
+	case -EPIPE:
+	case -ENOTCONN:
 		task->tk_action = call_bind;
 		break;
 	case -EAGAIN:

net/sunrpc/rpcb_clnt.c

@@ -63,9 +63,16 @@ enum {
  * r_owner
  *
  * The "owner" is allowed to unset a service in the rpcbind database.
- * We always use the following (arbitrary) fixed string.
+ *
+ * For AF_LOCAL SET/UNSET requests, rpcbind treats this string as a
+ * UID which it maps to a local user name via a password lookup.
+ * In all other cases it is ignored.
+ *
+ * For SET/UNSET requests, user space provides a value, even for
+ * network requests, and GETADDR uses an empty string.  We follow
+ * those precedents here.
  */
-#define RPCB_OWNER_STRING	"rpcb"
+#define RPCB_OWNER_STRING	"0"
 #define RPCB_MAXOWNERLEN	sizeof(RPCB_OWNER_STRING)
 
 static void			rpcb_getport_done(struct rpc_task *, void *);
@@ -124,12 +131,6 @@ static const struct sockaddr_in rpcb_inaddr_loopback = {
 	.sin_port		= htons(RPCBIND_PORT),
 };
 
-static const struct sockaddr_in6 rpcb_in6addr_loopback = {
-	.sin6_family		= AF_INET6,
-	.sin6_addr		= IN6ADDR_LOOPBACK_INIT,
-	.sin6_port		= htons(RPCBIND_PORT),
-};
-
 static struct rpc_clnt *rpcb_create_local(struct sockaddr *addr,
 					  size_t addrlen, u32 version)
 {
@@ -176,9 +177,10 @@ static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
 	return rpc_create(&args);
 }
 
-static int rpcb_register_call(struct sockaddr *addr, size_t addrlen,
-			      u32 version, struct rpc_message *msg)
+static int rpcb_register_call(const u32 version, struct rpc_message *msg)
 {
+	struct sockaddr *addr = (struct sockaddr *)&rpcb_inaddr_loopback;
+	size_t addrlen = sizeof(rpcb_inaddr_loopback);
 	struct rpc_clnt *rpcb_clnt;
 	int result, error = 0;
 
@@ -192,7 +194,7 @@ static int rpcb_register_call(struct sockaddr *addr, size_t addrlen,
 		error = PTR_ERR(rpcb_clnt);
 
 	if (error < 0) {
-		printk(KERN_WARNING "RPC: failed to contact local rpcbind "
+		dprintk("RPC:       failed to contact local rpcbind "
 				"server (errno %d).\n", -error);
 		return error;
 	}
@@ -254,25 +256,23 @@ int rpcb_register(u32 prog, u32 vers, int prot, unsigned short port)
 	if (port)
 		msg.rpc_proc = &rpcb_procedures2[RPCBPROC_SET];
 
-	return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
-					sizeof(rpcb_inaddr_loopback),
-					RPCBVERS_2, &msg);
+	return rpcb_register_call(RPCBVERS_2, &msg);
 }
 
 /*
  * Fill in AF_INET family-specific arguments to register
  */
-static int rpcb_register_netid4(struct sockaddr_in *address_to_register,
-				struct rpc_message *msg)
+static int rpcb_register_inet4(const struct sockaddr *sap,
+			       struct rpc_message *msg)
 {
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
 	struct rpcbind_args *map = msg->rpc_argp;
-	unsigned short port = ntohs(address_to_register->sin_port);
+	unsigned short port = ntohs(sin->sin_port);
 	char buf[32];
 
 	/* Construct AF_INET universal address */
 	snprintf(buf, sizeof(buf), "%pI4.%u.%u",
-		 &address_to_register->sin_addr.s_addr,
-		 port >> 8, port & 0xff);
+		 &sin->sin_addr.s_addr, port >> 8, port & 0xff);
 	map->r_addr = buf;
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
@@ -284,29 +284,27 @@ static int rpcb_register_netid4(struct sockaddr_in *address_to_register,
 	if (port)
 		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
 
-	return rpcb_register_call((struct sockaddr *)&rpcb_inaddr_loopback,
-					sizeof(rpcb_inaddr_loopback),
-					RPCBVERS_4, msg);
+	return rpcb_register_call(RPCBVERS_4, msg);
 }
 
 /*
  * Fill in AF_INET6 family-specific arguments to register
  */
-static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
-				struct rpc_message *msg)
+static int rpcb_register_inet6(const struct sockaddr *sap,
+			       struct rpc_message *msg)
 {
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
 	struct rpcbind_args *map = msg->rpc_argp;
-	unsigned short port = ntohs(address_to_register->sin6_port);
+	unsigned short port = ntohs(sin6->sin6_port);
 	char buf[64];
 
 	/* Construct AF_INET6 universal address */
-	if (ipv6_addr_any(&address_to_register->sin6_addr))
+	if (ipv6_addr_any(&sin6->sin6_addr))
 		snprintf(buf, sizeof(buf), "::.%u.%u",
 				port >> 8, port & 0xff);
 	else
 		snprintf(buf, sizeof(buf), "%pI6.%u.%u",
-			 &address_to_register->sin6_addr,
-			 port >> 8, port & 0xff);
+			 &sin6->sin6_addr, port >> 8, port & 0xff);
 	map->r_addr = buf;
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
@@ -318,9 +316,21 @@ static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
 	if (port)
 		msg->rpc_proc = &rpcb_procedures4[RPCBPROC_SET];
 
-	return rpcb_register_call((struct sockaddr *)&rpcb_in6addr_loopback,
-					sizeof(rpcb_in6addr_loopback),
-					RPCBVERS_4, msg);
+	return rpcb_register_call(RPCBVERS_4, msg);
+}
+
+static int rpcb_unregister_all_protofamilies(struct rpc_message *msg)
+{
+	struct rpcbind_args *map = msg->rpc_argp;
+
+	dprintk("RPC:       unregistering [%u, %u, '%s'] with "
+		"local rpcbind\n",
+			map->r_prog, map->r_vers, map->r_netid);
+
+	map->r_addr = "";
+	msg->rpc_proc = &rpcb_procedures4[RPCBPROC_UNSET];
+
+	return rpcb_register_call(RPCBVERS_4, msg);
 }
 
 /**
@@ -340,10 +350,11 @@ static int rpcb_register_netid6(struct sockaddr_in6 *address_to_register,
  * invoke this function once for each [program, version, address,
  * netid] tuple they wish to advertise.
  *
- * Callers may also unregister RPC services that are no longer
- * available by setting the port number in the passed-in address
- * to zero.  Callers pass a netid of "" to unregister all
- * transport netids associated with [program, version, address].
+ * Callers may also unregister RPC services that are registered at a
+ * specific address by setting the port number in @address to zero.
+ * They may unregister all registered protocol families at once for
+ * a service by passing a NULL @address argument.  If @netid is ""
+ * then all netids for [program, version, address] are unregistered.
  *
  * This function uses rpcbind protocol version 4 to contact the
  * local rpcbind daemon.  The local rpcbind daemon must support
@@ -378,13 +389,14 @@ int rpcb_v4_register(const u32 program, const u32 version,
 		.rpc_argp	= &map,
 	};
 
+	if (address == NULL)
+		return rpcb_unregister_all_protofamilies(&msg);
+
 	switch (address->sa_family) {
 	case AF_INET:
-		return rpcb_register_netid4((struct sockaddr_in *)address,
-					    &msg);
+		return rpcb_register_inet4(address, &msg);
 	case AF_INET6:
-		return rpcb_register_netid6((struct sockaddr_in6 *)address,
-					    &msg);
+		return rpcb_register_inet6(address, &msg);
 	}
 
 	return -EAFNOSUPPORT;
@@ -579,7 +591,7 @@ void rpcb_getport_async(struct rpc_task *task)
 	map->r_xprt = xprt_get(xprt);
 	map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
 	map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
-	map->r_owner = RPCB_OWNER_STRING;	/* ignored for GETADDR */
+	map->r_owner = "";
 	map->r_status = -EIO;
 
 	child = rpcb_call_async(rpcb_clnt, map, proc);
@@ -703,11 +715,16 @@ static int rpcb_decode_getaddr(struct rpc_rqst *req, __be32 *p,
 	*portp = 0;
 	addr_len = ntohl(*p++);
 
+	if (addr_len == 0) {
+		dprintk("RPC:       rpcb_decode_getaddr: "
+					"service is not registered\n");
+		return 0;
+	}
+
 	/*
-	 * Simple sanity check.  The smallest possible universal
-	 * address is an IPv4 address string containing 11 bytes.
+	 * Simple sanity check.
 	 */
-	if (addr_len < 11 || addr_len > RPCBIND_MAXUADDRLEN)
+	if (addr_len > RPCBIND_MAXUADDRLEN)
 		goto out_err;
 
 	/*

net/sunrpc/svc.c

@@ -359,7 +359,7 @@ svc_pool_for_cpu(struct svc_serv *serv, int cpu)
  */
 static struct svc_serv *
 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
-	   sa_family_t family, void (*shutdown)(struct svc_serv *serv))
+	     void (*shutdown)(struct svc_serv *serv))
 {
 	struct svc_serv	*serv;
 	unsigned int vers;
@@ -368,7 +368,6 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
 
 	if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
 		return NULL;
-	serv->sv_family    = family;
 	serv->sv_name      = prog->pg_name;
 	serv->sv_program   = prog;
 	serv->sv_nrthreads = 1;
@@ -427,21 +426,21 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
 
 struct svc_serv *
 svc_create(struct svc_program *prog, unsigned int bufsize,
-		sa_family_t family, void (*shutdown)(struct svc_serv *serv))
+	   void (*shutdown)(struct svc_serv *serv))
 {
-	return __svc_create(prog, bufsize, /*npools*/1, family, shutdown);
+	return __svc_create(prog, bufsize, /*npools*/1, shutdown);
 }
 EXPORT_SYMBOL_GPL(svc_create);
 
 struct svc_serv *
 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
-		  sa_family_t family, void (*shutdown)(struct svc_serv *serv),
+		  void (*shutdown)(struct svc_serv *serv),
 		  svc_thread_fn func, struct module *mod)
 {
 	struct svc_serv *serv;
 	unsigned int npools = svc_pool_map_get();
 
-	serv = __svc_create(prog, bufsize, npools, family, shutdown);
+	serv = __svc_create(prog, bufsize, npools, shutdown);
 
 	if (serv != NULL) {
 		serv->sv_function = func;
@@ -719,8 +718,6 @@ svc_exit_thread(struct svc_rqst *rqstp)
 }
 EXPORT_SYMBOL_GPL(svc_exit_thread);
 
-#ifdef CONFIG_SUNRPC_REGISTER_V4
-
 /*
  * Register an "inet" protocol family netid with the local
  * rpcbind daemon via an rpcbind v4 SET request.
@@ -735,12 +732,13 @@ static int __svc_rpcb_register4(const u32 program, const u32 version,
 				const unsigned short protocol,
 				const unsigned short port)
 {
-	struct sockaddr_in sin = {
+	const struct sockaddr_in sin = {
 		.sin_family		= AF_INET,
 		.sin_addr.s_addr	= htonl(INADDR_ANY),
 		.sin_port		= htons(port),
 	};
-	char *netid;
+	const char *netid;
+	int error;
 
 	switch (protocol) {
 	case IPPROTO_UDP:
@@ -750,13 +748,23 @@ static int __svc_rpcb_register4(const u32 program, const u32 version,
 		netid = RPCBIND_NETID_TCP;
 		break;
 	default:
-		return -EPROTONOSUPPORT;
+		return -ENOPROTOOPT;
 	}
 
-	return rpcb_v4_register(program, version,
-				(struct sockaddr *)&sin, netid);
+	error = rpcb_v4_register(program, version,
+					(const struct sockaddr *)&sin, netid);
+
+	/*
+	 * User space didn't support rpcbind v4, so retry this
+	 * registration request with the legacy rpcbind v2 protocol.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = rpcb_register(program, version, protocol, port);
+
+	return error;
 }
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 /*
  * Register an "inet6" protocol family netid with the local
  * rpcbind daemon via an rpcbind v4 SET request.
@@ -771,12 +779,13 @@ static int __svc_rpcb_register6(const u32 program, const u32 version,
 				const unsigned short protocol,
 				const unsigned short port)
 {
-	struct sockaddr_in6 sin6 = {
+	const struct sockaddr_in6 sin6 = {
 		.sin6_family		= AF_INET6,
 		.sin6_addr		= IN6ADDR_ANY_INIT,
 		.sin6_port		= htons(port),
 	};
-	char *netid;
+	const char *netid;
+	int error;
 
 	switch (protocol) {
 	case IPPROTO_UDP:
@@ -786,12 +795,22 @@ static int __svc_rpcb_register6(const u32 program, const u32 version,
 		netid = RPCBIND_NETID_TCP6;
 		break;
 	default:
-		return -EPROTONOSUPPORT;
+		return -ENOPROTOOPT;
 	}
 
-	return rpcb_v4_register(program, version,
-				(struct sockaddr *)&sin6, netid);
+	error = rpcb_v4_register(program, version,
+					(const struct sockaddr *)&sin6, netid);
+
+	/*
+	 * User space didn't support rpcbind version 4, so we won't
+	 * use a PF_INET6 listener.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = -EAFNOSUPPORT;
+
+	return error;
 }
+#endif	/* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 
 /*
  * Register a kernel RPC service via rpcbind version 4.
@@ -799,69 +818,43 @@ static int __svc_rpcb_register6(const u32 program, const u32 version,
  * Returns zero on success; a negative errno value is returned
  * if any error occurs.
  */
-static int __svc_register(const u32 program, const u32 version,
-			  const sa_family_t family,
+static int __svc_register(const char *progname,
+			  const u32 program, const u32 version,
+			  const int family,
 			  const unsigned short protocol,
 			  const unsigned short port)
 {
-	int error;
+	int error = -EAFNOSUPPORT;
 
 	switch (family) {
-	case AF_INET:
-		return __svc_rpcb_register4(program, version,
+	case PF_INET:
+		error = __svc_rpcb_register4(program, version,
 						protocol, port);
-	case AF_INET6:
+		break;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	case PF_INET6:
 		error = __svc_rpcb_register6(program, version,
 						protocol, port);
-		if (error < 0)
-			return error;
-
-		/*
-		 * Work around bug in some versions of Linux rpcbind
-		 * which don't allow registration of both inet and
-		 * inet6 netids.
-		 *
-		 * Error return ignored for now.
-		 */
-		__svc_rpcb_register4(program, version,
-						protocol, port);
-		return 0;
+#endif	/* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 	}
 
-	return -EAFNOSUPPORT;
-}
-
-#else	/* CONFIG_SUNRPC_REGISTER_V4 */
-
-/*
- * Register a kernel RPC service via rpcbind version 2.
- *
- * Returns zero on success; a negative errno value is returned
- * if any error occurs.
- */
-static int __svc_register(const u32 program, const u32 version,
-			  sa_family_t family,
-			  const unsigned short protocol,
-			  const unsigned short port)
-{
-	if (family != AF_INET)
-		return -EAFNOSUPPORT;
-
-	return rpcb_register(program, version, protocol, port);
+	if (error < 0)
+		printk(KERN_WARNING "svc: failed to register %sv%u RPC "
+			"service (errno %d).\n", progname, version, -error);
+	return error;
 }
 
-#endif /* CONFIG_SUNRPC_REGISTER_V4 */
-
 /**
  * svc_register - register an RPC service with the local portmapper
  * @serv: svc_serv struct for the service to register
+ * @family: protocol family of service's listener socket
  * @proto: transport protocol number to advertise
  * @port: port to advertise
  *
- * Service is registered for any address in serv's address family
+ * Service is registered for any address in the passed-in protocol family
  */
-int svc_register(const struct svc_serv *serv, const unsigned short proto,
-		 const unsigned short port)
+int svc_register(const struct svc_serv *serv, const int family,
+		 const unsigned short proto, const unsigned short port)
 {
 	struct svc_program	*progp;
 	unsigned int		i;
@@ -879,15 +872,15 @@ int svc_register(const struct svc_serv *serv, const unsigned short proto,
 					i,
 					proto == IPPROTO_UDP?  "udp" : "tcp",
 					port,
-					serv->sv_family,
+					family,
 					progp->pg_vers[i]->vs_hidden?
 						" (but not telling portmap)" : "");
 
 			if (progp->pg_vers[i]->vs_hidden)
 				continue;
 
-			error = __svc_register(progp->pg_prog, i,
-						serv->sv_family, proto, port);
+			error = __svc_register(progp->pg_name, progp->pg_prog,
+						i, family, proto, port);
 			if (error < 0)
 				break;
 		}
@@ -896,38 +889,31 @@ int svc_register(const struct svc_serv *serv, const unsigned short proto,
 	return error;
 }
 
-#ifdef CONFIG_SUNRPC_REGISTER_V4
-
+/*
+ * If user space is running rpcbind, it should take the v4 UNSET
+ * and clear everything for this [program, version].  If user space
+ * is running portmap, it will reject the v4 UNSET, but won't have
+ * any "inet6" entries anyway.  So a PMAP_UNSET should be sufficient
+ * in this case to clear all existing entries for [program, version].
+ */
 static void __svc_unregister(const u32 program, const u32 version,
 			     const char *progname)
 {
-	struct sockaddr_in6 sin6 = {
-		.sin6_family		= AF_INET6,
-		.sin6_addr		= IN6ADDR_ANY_INIT,
-		.sin6_port		= 0,
-	};
 	int error;
 
-	error = rpcb_v4_register(program, version,
-				(struct sockaddr *)&sin6, "");
-	dprintk("svc: %s(%sv%u), error %d\n",
-			__func__, progname, version, error);
-}
-
-#else	/* CONFIG_SUNRPC_REGISTER_V4 */
+	error = rpcb_v4_register(program, version, NULL, "");
 
-static void __svc_unregister(const u32 program, const u32 version,
-			     const char *progname)
-{
-	int error;
+	/*
+	 * User space didn't support rpcbind v4, so retry this
+	 * request with the legacy rpcbind v2 protocol.
+	 */
+	if (error == -EPROTONOSUPPORT)
+		error = rpcb_register(program, version, 0, 0);
 
-	error = rpcb_register(program, version, 0, 0);
 	dprintk("svc: %s(%sv%u), error %d\n",
 			__func__, progname, version, error);
 }
 
-#endif	/* CONFIG_SUNRPC_REGISTER_V4 */
-
 /*
  * All netids, bind addresses and ports registered for [program, version]
  * are removed from the local rpcbind database (if the service is not

net/sunrpc/svc_xprt.c

@@ -161,7 +161,9 @@ EXPORT_SYMBOL_GPL(svc_xprt_init);
 
 static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl,
 					 struct svc_serv *serv,
-					 unsigned short port, int flags)
+					 const int family,
+					 const unsigned short port,
+					 int flags)
 {
 	struct sockaddr_in sin = {
 		.sin_family		= AF_INET,
@@ -176,12 +178,12 @@ static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl,
 	struct sockaddr *sap;
 	size_t len;
 
-	switch (serv->sv_family) {
-	case AF_INET:
+	switch (family) {
+	case PF_INET:
 		sap = (struct sockaddr *)&sin;
 		len = sizeof(sin);
 		break;
-	case AF_INET6:
+	case PF_INET6:
 		sap = (struct sockaddr *)&sin6;
 		len = sizeof(sin6);
 		break;
@@ -192,7 +194,8 @@ static struct svc_xprt *__svc_xpo_create(struct svc_xprt_class *xcl,
 	return xcl->xcl_ops->xpo_create(serv, sap, len, flags);
 }
 
-int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
+int svc_create_xprt(struct svc_serv *serv, const char *xprt_name,
+		    const int family, const unsigned short port,
 		    int flags)
 {
 	struct svc_xprt_class *xcl;
@@ -209,7 +212,7 @@ int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
 			goto err;
 
 		spin_unlock(&svc_xprt_class_lock);
-		newxprt = __svc_xpo_create(xcl, serv, port, flags);
+		newxprt = __svc_xpo_create(xcl, serv, family, port, flags);
 		if (IS_ERR(newxprt)) {
 			module_put(xcl->xcl_owner);
 			return PTR_ERR(newxprt);
@@ -1033,7 +1036,13 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
 	return dr;
 }
 
-/*
+/**
+ * svc_find_xprt - find an RPC transport instance
+ * @serv: pointer to svc_serv to search
+ * @xcl_name: C string containing transport's class name
+ * @af: Address family of transport's local address
+ * @port: transport's IP port number
+ *
  * Return the transport instance pointer for the endpoint accepting
  * connections/peer traffic from the specified transport class,
  * address family and port.
@@ -1042,14 +1051,14 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
  * wild-card, and will result in matching the first transport in the
  * service's list that has a matching class name.
  */
-struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
-			       int af, int port)
+struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
+			       const sa_family_t af, const unsigned short port)
 {
 	struct svc_xprt *xprt;
 	struct svc_xprt *found = NULL;
 
 	/* Sanity check the args */
-	if (!serv || !xcl_name)
+	if (serv == NULL || xcl_name == NULL)
 		return found;
 
 	spin_lock_bh(&serv->sv_lock);
@@ -1058,7 +1067,7 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
 			continue;
 		if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family)
 			continue;
-		if (port && port != svc_xprt_local_port(xprt))
+		if (port != 0 && port != svc_xprt_local_port(xprt))
 			continue;
 		found = xprt;
 		svc_xprt_get(xprt);

net/sunrpc/svcsock.c

@@ -1110,7 +1110,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	struct svc_sock	*svsk;
 	struct sock	*inet;
 	int		pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
-	int		val;
 
 	dprintk("svc: svc_setup_socket %p\n", sock);
 	if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
@@ -1122,7 +1121,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 
 	/* Register socket with portmapper */
 	if (*errp >= 0 && pmap_register)
-		*errp = svc_register(serv, inet->sk_protocol,
+		*errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
 				     ntohs(inet_sk(inet)->sport));
 
 	if (*errp < 0) {
@@ -1143,18 +1142,6 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	else
 		svc_tcp_init(svsk, serv);
 
-	/*
-	 * We start one listener per sv_serv.  We want AF_INET
-	 * requests to be automatically shunted to our AF_INET6
-	 * listener using a mapped IPv4 address.  Make sure
-	 * no-one starts an equivalent IPv4 listener, which
-	 * would steal our incoming connections.
-	 */
-	val = 0;
-	if (serv->sv_family == AF_INET6)
-		kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
-					(char *)&val, sizeof(val));
-
 	dprintk("svc: svc_setup_socket created %p (inet %p)\n",
 				svsk, svsk->sk_sk);
 
@@ -1222,6 +1209,8 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
 	struct sockaddr_storage addr;
 	struct sockaddr *newsin = (struct sockaddr *)&addr;
 	int		newlen;
+	int		family;
+	int		val;
 	RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 
 	dprintk("svc: svc_create_socket(%s, %d, %s)\n",
@@ -1233,14 +1222,35 @@ static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
 				"sockets supported\n");
 		return ERR_PTR(-EINVAL);
 	}
+
 	type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
+	switch (sin->sa_family) {
+	case AF_INET6:
+		family = PF_INET6;
+		break;
+	case AF_INET:
+		family = PF_INET;
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
 
-	error = sock_create_kern(sin->sa_family, type, protocol, &sock);
+	error = sock_create_kern(family, type, protocol, &sock);
 	if (error < 0)
 		return ERR_PTR(error);
 
 	svc_reclassify_socket(sock);
 
+	/*
+	 * If this is an PF_INET6 listener, we want to avoid
+	 * getting requests from IPv4 remotes.  Those should
+	 * be shunted to a PF_INET listener via rpcbind.
+	 */
+	val = 1;
+	if (family == PF_INET6)
+		kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+					(char *)&val, sizeof(val));
+
 	if (type == SOCK_STREAM)
 		sock->sk->sk_reuse = 1;		/* allow address reuse */
 	error = kernel_bind(sock, sin, len);

net/sunrpc/xprt.c

@@ -151,6 +151,37 @@ int xprt_unregister_transport(struct xprt_class *transport)
 }
 EXPORT_SYMBOL_GPL(xprt_unregister_transport);
 
+/**
+ * xprt_load_transport - load a transport implementation
+ * @transport_name: transport to load
+ *
+ * Returns:
+ * 0:		transport successfully loaded
+ * -ENOENT:	transport module not available
+ */
+int xprt_load_transport(const char *transport_name)
+{
+	struct xprt_class *t;
+	char module_name[sizeof t->name + 5];
+	int result;
+
+	result = 0;
+	spin_lock(&xprt_list_lock);
+	list_for_each_entry(t, &xprt_list, list) {
+		if (strcmp(t->name, transport_name) == 0) {
+			spin_unlock(&xprt_list_lock);
+			goto out;
+		}
+	}
+	spin_unlock(&xprt_list_lock);
+	strcpy(module_name, "xprt");
+	strncat(module_name, transport_name, sizeof t->name);
+	result = request_module(module_name);
+out:
+	return result;
+}
+EXPORT_SYMBOL_GPL(xprt_load_transport);
+
 /**
  * xprt_reserve_xprt - serialize write access to transports
  * @task: task that is requesting access to the transport
@@ -580,7 +611,7 @@ void xprt_disconnect_done(struct rpc_xprt *xprt)
 	dprintk("RPC:       disconnected transport %p\n", xprt);
 	spin_lock_bh(&xprt->transport_lock);
 	xprt_clear_connected(xprt);
-	xprt_wake_pending_tasks(xprt, -ENOTCONN);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
 	spin_unlock_bh(&xprt->transport_lock);
 }
 EXPORT_SYMBOL_GPL(xprt_disconnect_done);
@@ -598,7 +629,7 @@ void xprt_force_disconnect(struct rpc_xprt *xprt)
 	/* Try to schedule an autoclose RPC call */
 	if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
 		queue_work(rpciod_workqueue, &xprt->task_cleanup);
-	xprt_wake_pending_tasks(xprt, -ENOTCONN);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
 	spin_unlock_bh(&xprt->transport_lock);
 }
 
@@ -625,7 +656,7 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
 	/* Try to schedule an autoclose RPC call */
 	if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
 		queue_work(rpciod_workqueue, &xprt->task_cleanup);
-	xprt_wake_pending_tasks(xprt, -ENOTCONN);
+	xprt_wake_pending_tasks(xprt, -EAGAIN);
 out:
 	spin_unlock_bh(&xprt->transport_lock);
 }
@@ -695,9 +726,8 @@ static void xprt_connect_status(struct rpc_task *task)
 	}
 
 	switch (task->tk_status) {
-	case -ENOTCONN:
-		dprintk("RPC: %5u xprt_connect_status: connection broken\n",
-				task->tk_pid);
+	case -EAGAIN:
+		dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid);
 		break;
 	case -ETIMEDOUT:
 		dprintk("RPC: %5u xprt_connect_status: connect attempt timed "
@@ -818,15 +848,8 @@ int xprt_prepare_transmit(struct rpc_task *task)
 		err = req->rq_received;
 		goto out_unlock;
 	}
-	if (!xprt->ops->reserve_xprt(task)) {
+	if (!xprt->ops->reserve_xprt(task))
 		err = -EAGAIN;
-		goto out_unlock;
-	}
-
-	if (!xprt_connected(xprt)) {
-		err = -ENOTCONN;
-		goto out_unlock;
-	}
 out_unlock:
 	spin_unlock_bh(&xprt->transport_lock);
 	return err;
@@ -870,32 +893,26 @@ void xprt_transmit(struct rpc_task *task)
 	req->rq_connect_cookie = xprt->connect_cookie;
 	req->rq_xtime = jiffies;
 	status = xprt->ops->send_request(task);
-	if (status == 0) {
-		dprintk("RPC: %5u xmit complete\n", task->tk_pid);
-		spin_lock_bh(&xprt->transport_lock);
+	if (status != 0) {
+		task->tk_status = status;
+		return;
+	}
 
-		xprt->ops->set_retrans_timeout(task);
+	dprintk("RPC: %5u xmit complete\n", task->tk_pid);
+	spin_lock_bh(&xprt->transport_lock);
 
-		xprt->stat.sends++;
-		xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
-		xprt->stat.bklog_u += xprt->backlog.qlen;
+	xprt->ops->set_retrans_timeout(task);
 
-		/* Don't race with disconnect */
-		if (!xprt_connected(xprt))
-			task->tk_status = -ENOTCONN;
-		else if (!req->rq_received)
-			rpc_sleep_on(&xprt->pending, task, xprt_timer);
-		spin_unlock_bh(&xprt->transport_lock);
-		return;
-	}
+	xprt->stat.sends++;
+	xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
+	xprt->stat.bklog_u += xprt->backlog.qlen;
 
-	/* Note: at this point, task->tk_sleeping has not yet been set,
-	 *	 hence there is no danger of the waking up task being put on
-	 *	 schedq, and being picked up by a parallel run of rpciod().
-	 */
-	task->tk_status = status;
-	if (status == -ECONNREFUSED)
-		rpc_sleep_on(&xprt->sending, task, NULL);
+	/* Don't race with disconnect */
+	if (!xprt_connected(xprt))
+		task->tk_status = -ENOTCONN;
+	else if (!req->rq_received)
+		rpc_sleep_on(&xprt->pending, task, xprt_timer);
+	spin_unlock_bh(&xprt->transport_lock);
 }
 
 static inline void do_xprt_reserve(struct rpc_task *task)

net/sunrpc/xprtrdma/rpc_rdma.c

@@ -310,6 +310,19 @@ rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
 		__func__, pad, destp, rqst->rq_slen, curlen);
 
 	copy_len = rqst->rq_snd_buf.page_len;
+
+	if (rqst->rq_snd_buf.tail[0].iov_len) {
+		curlen = rqst->rq_snd_buf.tail[0].iov_len;
+		if (destp + copy_len != rqst->rq_snd_buf.tail[0].iov_base) {
+			memmove(destp + copy_len,
+				rqst->rq_snd_buf.tail[0].iov_base, curlen);
+			r_xprt->rx_stats.pullup_copy_count += curlen;
+		}
+		dprintk("RPC:       %s: tail destp 0x%p len %d\n",
+			__func__, destp + copy_len, curlen);
+		rqst->rq_svec[0].iov_len += curlen;
+	}
+
 	r_xprt->rx_stats.pullup_copy_count += copy_len;
 	npages = PAGE_ALIGN(rqst->rq_snd_buf.page_base+copy_len) >> PAGE_SHIFT;
 	for (i = 0; copy_len && i < npages; i++) {
@@ -332,17 +345,6 @@ rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
 		destp += curlen;
 		copy_len -= curlen;
 	}
-	if (rqst->rq_snd_buf.tail[0].iov_len) {
-		curlen = rqst->rq_snd_buf.tail[0].iov_len;
-		if (destp != rqst->rq_snd_buf.tail[0].iov_base) {
-			memcpy(destp,
-				rqst->rq_snd_buf.tail[0].iov_base, curlen);
-			r_xprt->rx_stats.pullup_copy_count += curlen;
-		}
-		dprintk("RPC:       %s: tail destp 0x%p len %d curlen %d\n",
-			__func__, destp, copy_len, curlen);
-		rqst->rq_svec[0].iov_len += curlen;
-	}
 	/* header now contains entire send message */
 	return pad;
 }
@@ -656,7 +658,7 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
 		if (curlen > rqst->rq_rcv_buf.tail[0].iov_len)
 			curlen = rqst->rq_rcv_buf.tail[0].iov_len;
 		if (rqst->rq_rcv_buf.tail[0].iov_base != srcp)
-			memcpy(rqst->rq_rcv_buf.tail[0].iov_base, srcp, curlen);
+			memmove(rqst->rq_rcv_buf.tail[0].iov_base, srcp, curlen);
 		dprintk("RPC:       %s: tail srcp 0x%p len %d curlen %d\n",
 			__func__, srcp, copy_len, curlen);
 		rqst->rq_rcv_buf.tail[0].iov_len = curlen;

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -191,7 +191,6 @@ static int map_xdr(struct svcxprt_rdma *xprt,
 		   struct xdr_buf *xdr,
 		   struct svc_rdma_req_map *vec)
 {
-	int sge_max = (xdr->len+PAGE_SIZE-1) / PAGE_SIZE + 3;
 	int sge_no;
 	u32 sge_bytes;
 	u32 page_bytes;
@@ -235,7 +234,11 @@ static int map_xdr(struct svcxprt_rdma *xprt,
 		sge_no++;
 	}
 
-	BUG_ON(sge_no > sge_max);
+	dprintk("svcrdma: map_xdr: sge_no %d page_no %d "
+		"page_base %u page_len %u head_len %zu tail_len %zu\n",
+		sge_no, page_no, xdr->page_base, xdr->page_len,
+		xdr->head[0].iov_len, xdr->tail[0].iov_len);
+
 	vec->count = sge_no;
 	return 0;
 }
@@ -579,7 +582,6 @@ static int send_reply(struct svcxprt_rdma *rdma,
 			ctxt->sge[page_no+1].length = 0;
 	}
 	BUG_ON(sge_no > rdma->sc_max_sge);
-	BUG_ON(sge_no > ctxt->count);
 	memset(&send_wr, 0, sizeof send_wr);
 	ctxt->wr_op = IB_WR_SEND;
 	send_wr.wr_id = (unsigned long)ctxt;