From: J. Bruce Fields <bfields@citi.umich.edu>
Date: Tue, 16 Jun 2009 01:08:07 +0000 (-0700)
Subject: Merge commit 'v2.6.30' into for-2.6.31
X-Git-Tag: v2.6.31-rc1~57^2~15
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=7eef4091a653c243a87e5375c54504cc03bec4d8;hp=07a2039b8eb0af4ff464efd3dfd95de5c02648c6

Merge commit 'v2.6.30' into for-2.6.31
---

diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX
index 8dd6db7..f15621e 100644
--- a/Documentation/filesystems/00-INDEX
+++ b/Documentation/filesystems/00-INDEX
@@ -66,6 +66,10 @@ mandatory-locking.txt
 	- info on the Linux implementation of Sys V mandatory file locking.
 ncpfs.txt
 	- info on Novell Netware(tm) filesystem using NCP protocol.
+nfs41-server.txt
+	- info on the Linux server implementation of NFSv4 minor version 1.
+nfs-rdma.txt
+	- how to install and setup the Linux NFS/RDMA client and server software.
 nfsroot.txt
 	- short guide on setting up a diskless box with NFS root filesystem.
 nilfs2.txt
diff --git a/fs/Kconfig b/fs/Kconfig
index 9f7270f..44ab328 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -226,10 +226,12 @@ source "fs/nfsd/Kconfig"
 
 config LOCKD
 	tristate
+	depends on FILE_LOCKING
 
 config LOCKD_V4
 	bool
 	depends on NFSD_V3 || NFS_V3
+	depends on FILE_LOCKING
 	default y
 
 config EXPORTFS
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 83ee342..e577a78 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -326,6 +326,8 @@ static void nlmsvc_freegrantargs(struct nlm_rqst *call)
 {
 	if (call->a_args.lock.oh.data != call->a_owner)
 		kfree(call->a_args.lock.oh.data);
+
+	locks_release_private(&call->a_args.lock.fl);
 }
 
 /*
diff --git a/fs/locks.c b/fs/locks.c
index ec3deea..b6440f5 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -151,7 +151,7 @@ static struct file_lock *locks_alloc_lock(void)
 	return kmem_cache_alloc(filelock_cache, GFP_KERNEL);
 }
 
-static void locks_release_private(struct file_lock *fl)
+void locks_release_private(struct file_lock *fl)
 {
 	if (fl->fl_ops) {
 		if (fl->fl_ops->fl_release_private)
@@ -165,6 +165,7 @@ static void locks_release_private(struct file_lock *fl)
 	}
 
 }
+EXPORT_SYMBOL_GPL(locks_release_private);
 
 /* Free a lock which is not in use. */
 static void locks_free_lock(struct file_lock *fl)
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index e67f3ec..7dbb8f2 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -1,6 +1,6 @@
 config NFS_FS
 	tristate "NFS client support"
-	depends on INET
+	depends on INET && FILE_LOCKING
 	select LOCKD
 	select SUNRPC
 	select NFS_ACL_SUPPORT if NFS_V3_ACL
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 5839b22..6eb9181 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -464,16 +464,11 @@ static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
 		if (err)
 			return err;
 		/*
-		 * Just a quick sanity check; we could also try to check
-		 * whether this pseudoflavor is supported, but at worst
-		 * an unsupported pseudoflavor on the export would just
-		 * be a pseudoflavor that won't match the flavor of any
-		 * authenticated request.  The administrator will
-		 * probably discover the problem when someone fails to
-		 * authenticate.
+		 * XXX: It would be nice to also check whether this
+		 * pseudoflavor is supported, so we can discover the
+		 * problem at export time instead of when a client fails
+		 * to authenticate.
 		 */
-		if (f->pseudoflavor < 0)
-			return -EINVAL;
 		err = get_int(mesg, &f->flags);
 		if (err)
 			return err;
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 17d0dd9..01d4ec1 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -272,6 +272,7 @@ void fill_post_wcc(struct svc_fh *fhp)
 
 	err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
 			&fhp->fh_post_attr);
+	fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
 	if (err)
 		fhp->fh_post_saved = 0;
 	else
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 290289b..f4fab69 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -215,18 +215,18 @@ encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
 }
 
 static int
-encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
+encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp)
 {
 	__be32 *p;
-	int len = cb_rec->cbr_fh.fh_size;
+	int len = dp->dl_fh.fh_size;
 
-	RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
+	RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len);
 	WRITE32(OP_CB_RECALL);
-	WRITE32(cb_rec->cbr_stateid.si_generation);
-	WRITEMEM(&cb_rec->cbr_stateid.si_opaque, sizeof(stateid_opaque_t));
-	WRITE32(cb_rec->cbr_trunc);
+	WRITE32(dp->dl_stateid.si_generation);
+	WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t));
+	WRITE32(0); /* truncate optimization not implemented */
 	WRITE32(len);
-	WRITEMEM(&cb_rec->cbr_fh.fh_base, len);
+	WRITEMEM(&dp->dl_fh.fh_base, len);
 	return 0;
 }
 
@@ -241,11 +241,11 @@ nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
 }
 
 static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
 {
 	struct xdr_stream xdr;
 	struct nfs4_cb_compound_hdr hdr = {
-		.ident = args->cbr_ident,
+		.ident = args->dl_ident,
 		.nops   = 1,
 	};
 
@@ -358,18 +358,21 @@ static struct rpc_program cb_program = {
 		.pipe_dir_name  = "/nfsd4_cb",
 };
 
+static int max_cb_time(void)
+{
+	return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
+}
+
 /* Reference counting, callback cleanup, etc., all look racy as heck.
  * And why is cb_set an atomic? */
 
-static struct rpc_clnt *setup_callback_client(struct nfs4_client *clp)
+int setup_callback_client(struct nfs4_client *clp)
 {
 	struct sockaddr_in	addr;
-	struct nfs4_callback    *cb = &clp->cl_callback;
+	struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
 	struct rpc_timeout	timeparms = {
-		.to_initval	= (NFSD_LEASE_TIME/4) * HZ,
-		.to_retries	= 5,
-		.to_maxval	= (NFSD_LEASE_TIME/2) * HZ,
-		.to_exponential	= 1,
+		.to_initval	= max_cb_time(),
+		.to_retries	= 0,
 	};
 	struct rpc_create_args args = {
 		.protocol	= IPPROTO_TCP,
@@ -386,7 +389,7 @@ static struct rpc_clnt *setup_callback_client(struct nfs4_client *clp)
 	struct rpc_clnt *client;
 
 	if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 
 	/* Initialize address */
 	memset(&addr, 0, sizeof(addr));
@@ -396,48 +399,77 @@ static struct rpc_clnt *setup_callback_client(struct nfs4_client *clp)
 
 	/* Create RPC client */
 	client = rpc_create(&args);
-	if (IS_ERR(client))
+	if (IS_ERR(client)) {
 		dprintk("NFSD: couldn't create callback client: %ld\n",
 			PTR_ERR(client));
-	return client;
+		return PTR_ERR(client);
+	}
+	cb->cb_client = client;
+	return 0;
+
+}
+
+static void warn_no_callback_path(struct nfs4_client *clp, int reason)
+{
+	dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
+		(int)clp->cl_name.len, clp->cl_name.data, reason);
+}
+
+static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_client *clp = calldata;
+
+	if (task->tk_status)
+		warn_no_callback_path(clp, task->tk_status);
+	else
+		atomic_set(&clp->cl_cb_conn.cb_set, 1);
+	put_nfs4_client(clp);
+}
+
+static const struct rpc_call_ops nfsd4_cb_probe_ops = {
+	.rpc_call_done = nfsd4_cb_probe_done,
+};
 
+static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
+{
+	struct auth_cred acred = {
+		.machine_cred = 1
+	};
+
+	/*
+	 * Note in the gss case this doesn't actually have to wait for a
+	 * gss upcall (or any calls to the client); this just creates a
+	 * non-uptodate cred which the rpc state machine will fill in with
+	 * a refresh_upcall later.
+	 */
+	return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred,
+							RPCAUTH_LOOKUP_NEW);
 }
 
-static int do_probe_callback(void *data)
+void do_probe_callback(struct nfs4_client *clp)
 {
-	struct nfs4_client *clp = data;
-	struct nfs4_callback    *cb = &clp->cl_callback;
+	struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
 	struct rpc_message msg = {
 		.rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
 		.rpc_argp       = clp,
 	};
-	struct rpc_clnt *client;
+	struct rpc_cred *cred;
 	int status;
 
-	client = setup_callback_client(clp);
-	if (IS_ERR(client)) {
-		status = PTR_ERR(client);
-		dprintk("NFSD: couldn't create callback client: %d\n",
-								status);
-		goto out_err;
+	cred = lookup_cb_cred(cb);
+	if (IS_ERR(cred)) {
+		status = PTR_ERR(cred);
+		goto out;
+	}
+	cb->cb_cred = cred;
+	msg.rpc_cred = cb->cb_cred;
+	status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
+				&nfsd4_cb_probe_ops, (void *)clp);
+out:
+	if (status) {
+		warn_no_callback_path(clp, status);
+		put_nfs4_client(clp);
 	}
-
-	status = rpc_call_sync(client, &msg, RPC_TASK_SOFT);
-
-	if (status)
-		goto out_release_client;
-
-	cb->cb_client = client;
-	atomic_set(&cb->cb_set, 1);
-	put_nfs4_client(clp);
-	return 0;
-out_release_client:
-	rpc_shutdown_client(client);
-out_err:
-	dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
-		(int)clp->cl_name.len, clp->cl_name.data, status);
-	put_nfs4_client(clp);
-	return 0;
 }
 
 /*
@@ -446,21 +478,65 @@ out_err:
 void
 nfsd4_probe_callback(struct nfs4_client *clp)
 {
-	struct task_struct *t;
+	int status;
+
+	BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
 
-	BUG_ON(atomic_read(&clp->cl_callback.cb_set));
+	status = setup_callback_client(clp);
+	if (status) {
+		warn_no_callback_path(clp, status);
+		return;
+	}
 
 	/* the task holds a reference to the nfs4_client struct */
 	atomic_inc(&clp->cl_count);
 
-	t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe");
+	do_probe_callback(clp);
+}
 
-	if (IS_ERR(t))
-		atomic_dec(&clp->cl_count);
+static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_delegation *dp = calldata;
+	struct nfs4_client *clp = dp->dl_client;
 
-	return;
+	switch (task->tk_status) {
+	case -EIO:
+		/* Network partition? */
+		atomic_set(&clp->cl_cb_conn.cb_set, 0);
+		warn_no_callback_path(clp, task->tk_status);
+	case -EBADHANDLE:
+	case -NFS4ERR_BAD_STATEID:
+		/* Race: client probably got cb_recall
+		 * before open reply granting delegation */
+		break;
+	default:
+		/* success, or error we can't handle */
+		return;
+	}
+	if (dp->dl_retries--) {
+		rpc_delay(task, 2*HZ);
+		task->tk_status = 0;
+		rpc_restart_call(task);
+	} else {
+		atomic_set(&clp->cl_cb_conn.cb_set, 0);
+		warn_no_callback_path(clp, task->tk_status);
+	}
 }
 
+static void nfsd4_cb_recall_release(void *calldata)
+{
+	struct nfs4_delegation *dp = calldata;
+	struct nfs4_client *clp = dp->dl_client;
+
+	nfs4_put_delegation(dp);
+	put_nfs4_client(clp);
+}
+
+static const struct rpc_call_ops nfsd4_cb_recall_ops = {
+	.rpc_call_done = nfsd4_cb_recall_done,
+	.rpc_release = nfsd4_cb_recall_release,
+};
+
 /*
  * called with dp->dl_count inc'ed.
  */
@@ -468,41 +544,19 @@ void
 nfsd4_cb_recall(struct nfs4_delegation *dp)
 {
 	struct nfs4_client *clp = dp->dl_client;
-	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
-	struct nfs4_cb_recall *cbr = &dp->dl_recall;
+	struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
-		.rpc_argp = cbr,
+		.rpc_argp = dp,
+		.rpc_cred = clp->cl_cb_conn.cb_cred
 	};
-	int retries = 1;
-	int status = 0;
-
-	cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
-	cbr->cbr_dp = dp;
-
-	status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
-	while (retries--) {
-		switch (status) {
-			case -EIO:
-				/* Network partition? */
-				atomic_set(&clp->cl_callback.cb_set, 0);
-			case -EBADHANDLE:
-			case -NFS4ERR_BAD_STATEID:
-				/* Race: client probably got cb_recall
-				 * before open reply granting delegation */
-				break;
-			default:
-				goto out_put_cred;
-		}
-		ssleep(2);
-		status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
+	int status;
+
+	dp->dl_retries = 1;
+	status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
+				&nfsd4_cb_recall_ops, dp);
+	if (status) {
+		put_nfs4_client(clp);
+		nfs4_put_delegation(dp);
 	}
-out_put_cred:
-	/*
-	 * Success or failure, now we're either waiting for lease expiration
-	 * or deleg_return.
-	 */
-	put_nfs4_client(clp);
-	nfs4_put_delegation(dp);
-	return;
 }
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index b2883e9..7c88017 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -51,6 +51,78 @@
 
 #define NFSDDBG_FACILITY		NFSDDBG_PROC
 
+static u32 nfsd_attrmask[] = {
+	NFSD_WRITEABLE_ATTRS_WORD0,
+	NFSD_WRITEABLE_ATTRS_WORD1,
+	NFSD_WRITEABLE_ATTRS_WORD2
+};
+
+static u32 nfsd41_ex_attrmask[] = {
+	NFSD_SUPPATTR_EXCLCREAT_WORD0,
+	NFSD_SUPPATTR_EXCLCREAT_WORD1,
+	NFSD_SUPPATTR_EXCLCREAT_WORD2
+};
+
+static __be32
+check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+		   u32 *bmval, u32 *writable)
+{
+	struct dentry *dentry = cstate->current_fh.fh_dentry;
+	struct svc_export *exp = cstate->current_fh.fh_export;
+
+	/*
+	 * Check about attributes are supported by the NFSv4 server or not.
+	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
+	 */
+	if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
+	    (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
+	    (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
+		return nfserr_attrnotsupp;
+
+	/*
+	 * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
+	 * in current environment or not.
+	 */
+	if (bmval[0] & FATTR4_WORD0_ACL) {
+		if (!IS_POSIXACL(dentry->d_inode))
+			return nfserr_attrnotsupp;
+	}
+	if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
+		if (exp->ex_fslocs.locations == NULL)
+			return nfserr_attrnotsupp;
+	}
+
+	/*
+	 * According to spec, read-only attributes return ERR_INVAL.
+	 */
+	if (writable) {
+		if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
+		    (bmval[2] & ~writable[2]))
+			return nfserr_inval;
+	}
+
+	return nfs_ok;
+}
+
+static __be32
+nfsd4_check_open_attributes(struct svc_rqst *rqstp,
+	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
+{
+	__be32 status = nfs_ok;
+
+	if (open->op_create == NFS4_OPEN_CREATE) {
+		if (open->op_createmode == NFS4_CREATE_UNCHECKED
+		    || open->op_createmode == NFS4_CREATE_GUARDED)
+			status = check_attr_support(rqstp, cstate,
+					open->op_bmval, nfsd_attrmask);
+		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
+			status = check_attr_support(rqstp, cstate,
+					open->op_bmval, nfsd41_ex_attrmask);
+	}
+
+	return status;
+}
+
 static inline void
 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 {
@@ -225,6 +297,10 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (status)
 		goto out;
 
+	status = nfsd4_check_open_attributes(rqstp, cstate, open);
+	if (status)
+		goto out;
+
 	/* Openowner is now set, so sequence id will get bumped.  Now we need
 	 * these checks before we do any creates: */
 	status = nfserr_grace;
@@ -395,6 +471,11 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (status)
 		return status;
 
+	status = check_attr_support(rqstp, cstate, create->cr_bmval,
+				    nfsd_attrmask);
+	if (status)
+		return status;
+
 	switch (create->cr_type) {
 	case NF4LNK:
 		/* ugh! we have to null-terminate the linktext, or
@@ -689,6 +770,12 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (status)
 		return status;
 	status = nfs_ok;
+
+	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
+				    nfsd_attrmask);
+	if (status)
+		goto out;
+
 	if (setattr->sa_acl != NULL)
 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 					    setattr->sa_acl);
@@ -763,10 +850,10 @@ _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (status)
 		return status;
 
-	if ((verify->ve_bmval[0] & ~nfsd_suppattrs0(cstate->minorversion))
-	    || (verify->ve_bmval[1] & ~nfsd_suppattrs1(cstate->minorversion))
-	    || (verify->ve_bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
-		return nfserr_attrnotsupp;
+	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
+	if (status)
+		return status;
+
 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 		return nfserr_inval;
@@ -1226,24 +1313,9 @@ static const char *nfsd4_op_name(unsigned opnum)
 	return "unknown_operation";
 }
 
-#define nfs4svc_decode_voidargs		NULL
-#define nfs4svc_release_void		NULL
 #define nfsd4_voidres			nfsd4_voidargs
-#define nfs4svc_release_compound	NULL
 struct nfsd4_voidargs { int dummy; };
 
-#define PROC(name, argt, rest, relt, cache, respsize)	\
- { (svc_procfunc) nfsd4_proc_##name,		\
-   (kxdrproc_t) nfs4svc_decode_##argt##args,	\
-   (kxdrproc_t) nfs4svc_encode_##rest##res,	\
-   (kxdrproc_t) nfs4svc_release_##relt,		\
-   sizeof(struct nfsd4_##argt##args),		\
-   sizeof(struct nfsd4_##rest##res),		\
-   0,						\
-   cache,					\
-   respsize,					\
- }
-
 /*
  * TODO: At the present time, the NFSv4 server does not do XID caching
  * of requests.  Implementing XID caching would not be a serious problem,
@@ -1255,8 +1327,23 @@ struct nfsd4_voidargs { int dummy; };
  * better XID's.
  */
 static struct svc_procedure		nfsd_procedures4[2] = {
-  PROC(null,	 void,		void,		void,	  RC_NOCACHE, 1),
-  PROC(compound, compound,	compound,	compound, RC_NOCACHE, NFSD_BUFSIZE/4)
+	[NFSPROC4_NULL] = {
+		.pc_func = (svc_procfunc) nfsd4_proc_null,
+		.pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
+		.pc_argsize = sizeof(struct nfsd4_voidargs),
+		.pc_ressize = sizeof(struct nfsd4_voidres),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = 1,
+	},
+	[NFSPROC4_COMPOUND] = {
+		.pc_func = (svc_procfunc) nfsd4_proc_compound,
+		.pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
+		.pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
+		.pc_argsize = sizeof(struct nfsd4_compoundargs),
+		.pc_ressize = sizeof(struct nfsd4_compoundres),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = NFSD_BUFSIZE/4,
+	},
 };
 
 struct svc_version	nfsd_version4 = {
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 3b711f5..89d9ac5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -182,7 +182,7 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f
 {
 	struct nfs4_delegation *dp;
 	struct nfs4_file *fp = stp->st_file;
-	struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
+	struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
 
 	dprintk("NFSD alloc_init_deleg\n");
 	if (fp->fi_had_conflict)
@@ -203,10 +203,8 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f
 	get_file(stp->st_vfs_file);
 	dp->dl_vfs_file = stp->st_vfs_file;
 	dp->dl_type = type;
-	dp->dl_recall.cbr_dp = NULL;
-	dp->dl_recall.cbr_ident = cb->cb_ident;
-	dp->dl_recall.cbr_trunc = 0;
-	dp->dl_stateid.si_boot = boot_time;
+	dp->dl_ident = cb->cb_ident;
+	dp->dl_stateid.si_boot = get_seconds();
 	dp->dl_stateid.si_stateownerid = current_delegid++;
 	dp->dl_stateid.si_fileid = 0;
 	dp->dl_stateid.si_generation = 0;
@@ -632,16 +630,20 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name)
 static void
 shutdown_callback_client(struct nfs4_client *clp)
 {
-	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
+	struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
 
 	if (clnt) {
 		/*
 		 * Callback threads take a reference on the client, so there
 		 * should be no outstanding callbacks at this point.
 		 */
-		clp->cl_callback.cb_client = NULL;
+		clp->cl_cb_conn.cb_client = NULL;
 		rpc_shutdown_client(clnt);
 	}
+	if (clp->cl_cb_conn.cb_cred) {
+		put_rpccred(clp->cl_cb_conn.cb_cred);
+		clp->cl_cb_conn.cb_cred = NULL;
+	}
 }
 
 static inline void
@@ -714,7 +716,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
 		return NULL;
 	memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 	atomic_set(&clp->cl_count, 1);
-	atomic_set(&clp->cl_callback.cb_set, 0);
+	atomic_set(&clp->cl_cb_conn.cb_set, 0);
 	INIT_LIST_HEAD(&clp->cl_idhash);
 	INIT_LIST_HEAD(&clp->cl_strhash);
 	INIT_LIST_HEAD(&clp->cl_openowners);
@@ -966,7 +968,7 @@ parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigne
 static void
 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
 {
-	struct nfs4_callback *cb = &clp->cl_callback;
+	struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
 
 	/* Currently, we only support tcp for the callback channel */
 	if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
@@ -1686,9 +1688,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 		else {
 			/* XXX: We just turn off callbacks until we can handle
 			  * change request correctly. */
-			atomic_set(&conf->cl_callback.cb_set, 0);
-			gen_confirm(conf);
-			nfsd4_remove_clid_dir(unconf);
+			atomic_set(&conf->cl_cb_conn.cb_set, 0);
 			expire_client(unconf);
 			status = nfs_ok;
 
@@ -1882,7 +1882,7 @@ init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *
 	stp->st_stateowner = sop;
 	get_nfs4_file(fp);
 	stp->st_file = fp;
-	stp->st_stateid.si_boot = boot_time;
+	stp->st_stateid.si_boot = get_seconds();
 	stp->st_stateid.si_stateownerid = sop->so_id;
 	stp->st_stateid.si_fileid = fp->fi_id;
 	stp->st_stateid.si_generation = 0;
@@ -2059,19 +2059,6 @@ nfs4_file_downgrade(struct file *filp, unsigned int share_access)
 }
 
 /*
- * Recall a delegation
- */
-static int
-do_recall(void *__dp)
-{
-	struct nfs4_delegation *dp = __dp;
-
-	dp->dl_file->fi_had_conflict = true;
-	nfsd4_cb_recall(dp);
-	return 0;
-}
-
-/*
  * Spawn a thread to perform a recall on the delegation represented
  * by the lease (file_lock)
  *
@@ -2082,8 +2069,7 @@ do_recall(void *__dp)
 static
 void nfsd_break_deleg_cb(struct file_lock *fl)
 {
-	struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
-	struct task_struct *t;
+	struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
 
 	dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
 	if (!dp)
@@ -2111,16 +2097,8 @@ void nfsd_break_deleg_cb(struct file_lock *fl)
 	 */
 	fl->fl_break_time = 0;
 
-	t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
-	if (IS_ERR(t)) {
-		struct nfs4_client *clp = dp->dl_client;
-
-		printk(KERN_INFO "NFSD: Callback thread failed for "
-			"for client (clientid %08x/%08x)\n",
-			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
-		put_nfs4_client(dp->dl_client);
-		nfs4_put_delegation(dp);
-	}
+	dp->dl_file->fi_had_conflict = true;
+	nfsd4_cb_recall(dp);
 }
 
 /*
@@ -2422,7 +2400,7 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_sta
 {
 	struct nfs4_delegation *dp;
 	struct nfs4_stateowner *sop = stp->st_stateowner;
-	struct nfs4_callback *cb = &sop->so_client->cl_callback;
+	struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
 	struct file_lock fl, *flp = &fl;
 	int status, flag = 0;
 
@@ -2614,7 +2592,7 @@ nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	renew_client(clp);
 	status = nfserr_cb_path_down;
 	if (!list_empty(&clp->cl_delegations)
-			&& !atomic_read(&clp->cl_callback.cb_set))
+			&& !atomic_read(&clp->cl_cb_conn.cb_set))
 		goto out;
 	status = nfs_ok;
 out:
@@ -2738,12 +2716,42 @@ nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
 static int
 STALE_STATEID(stateid_t *stateid)
 {
-	if (stateid->si_boot == boot_time)
-		return 0;
-	dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
-		stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
-		stateid->si_generation);
-	return 1;
+	if (time_after((unsigned long)boot_time,
+			(unsigned long)stateid->si_boot)) {
+		dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
+			stateid->si_boot, stateid->si_stateownerid,
+			stateid->si_fileid, stateid->si_generation);
+		return 1;
+	}
+	return 0;
+}
+
+static int
+EXPIRED_STATEID(stateid_t *stateid)
+{
+	if (time_before((unsigned long)boot_time,
+			((unsigned long)stateid->si_boot)) &&
+	    time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) {
+		dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
+			stateid->si_boot, stateid->si_stateownerid,
+			stateid->si_fileid, stateid->si_generation);
+		return 1;
+	}
+	return 0;
+}
+
+static __be32
+stateid_error_map(stateid_t *stateid)
+{
+	if (STALE_STATEID(stateid))
+		return nfserr_stale_stateid;
+	if (EXPIRED_STATEID(stateid))
+		return nfserr_expired;
+
+	dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
+		stateid->si_boot, stateid->si_stateownerid,
+		stateid->si_fileid, stateid->si_generation);
+	return nfserr_bad_stateid;
 }
 
 static inline int
@@ -2867,8 +2875,10 @@ nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
 	status = nfserr_bad_stateid;
 	if (is_delegation_stateid(stateid)) {
 		dp = find_delegation_stateid(ino, stateid);
-		if (!dp)
+		if (!dp) {
+			status = stateid_error_map(stateid);
 			goto out;
+		}
 		status = check_stateid_generation(stateid, &dp->dl_stateid,
 						  flags);
 		if (status)
@@ -2881,8 +2891,10 @@ nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
 			*filpp = dp->dl_vfs_file;
 	} else { /* open or lock stateid */
 		stp = find_stateid(stateid, flags);
-		if (!stp)
+		if (!stp) {
+			status = stateid_error_map(stateid);
 			goto out;
+		}
 		if (nfs4_check_fh(current_fh, stp))
 			goto out;
 		if (!stp->st_stateowner->so_confirmed)
@@ -2956,7 +2968,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
 		 */
 		sop = search_close_lru(stateid->si_stateownerid, flags);
 		if (sop == NULL)
-			return nfserr_bad_stateid;
+			return stateid_error_map(stateid);
 		*sopp = sop;
 		goto check_replay;
 	}
@@ -3227,8 +3239,10 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (!is_delegation_stateid(stateid))
 		goto out;
 	dp = find_delegation_stateid(inode, stateid);
-	if (!dp)
+	if (!dp) {
+		status = stateid_error_map(stateid);
 		goto out;
+	}
 	status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
 	if (status)
 		goto out;
@@ -3455,7 +3469,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
 	stp->st_stateowner = sop;
 	get_nfs4_file(fp);
 	stp->st_file = fp;
-	stp->st_stateid.si_boot = boot_time;
+	stp->st_stateid.si_boot = get_seconds();
 	stp->st_stateid.si_stateownerid = sop->so_id;
 	stp->st_stateid.si_fileid = fp->fi_id;
 	stp->st_stateid.si_generation = 0;
@@ -3987,6 +4001,7 @@ nfs4_state_init(void)
 		INIT_LIST_HEAD(&conf_str_hashtbl[i]);
 		INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
 		INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
+		INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
 	}
 	for (i = 0; i < SESSION_HASH_SIZE; i++)
 		INIT_LIST_HEAD(&sessionid_hashtbl[i]);
@@ -4009,8 +4024,6 @@ nfs4_state_init(void)
 	INIT_LIST_HEAD(&close_lru);
 	INIT_LIST_HEAD(&client_lru);
 	INIT_LIST_HEAD(&del_recall_lru);
-	for (i = 0; i < CLIENT_HASH_SIZE; i++)
-		INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
 	reclaim_str_hashtbl_size = 0;
 	return 0;
 }
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b73549d..d07f704 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -83,16 +83,6 @@ check_filename(char *str, int len, __be32 err)
 	return 0;
 }
 
-/*
- * START OF "GENERIC" DECODE ROUTINES.
- *   These may look a little ugly since they are imported from a "generic"
- * set of XDR encode/decode routines which are intended to be shared by
- * all of our NFSv4 implementations (OpenBSD, MacOS X...).
- *
- * If the pain of reading these is too great, it should be a straightforward
- * task to translate them into Linux-specific versions which are more
- * consistent with the style used in NFSv2/v3...
- */
 #define DECODE_HEAD				\
 	__be32 *p;				\
 	__be32 status
@@ -254,20 +244,8 @@ nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 	DECODE_TAIL;
 }
 
-static u32 nfsd_attrmask[] = {
-	NFSD_WRITEABLE_ATTRS_WORD0,
-	NFSD_WRITEABLE_ATTRS_WORD1,
-	NFSD_WRITEABLE_ATTRS_WORD2
-};
-
-static u32 nfsd41_ex_attrmask[] = {
-	NFSD_SUPPATTR_EXCLCREAT_WORD0,
-	NFSD_SUPPATTR_EXCLCREAT_WORD1,
-	NFSD_SUPPATTR_EXCLCREAT_WORD2
-};
-
 static __be32
-nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,
+nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 		   struct iattr *iattr, struct nfs4_acl **acl)
 {
 	int expected_len, len = 0;
@@ -280,18 +258,6 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,
 	if ((status = nfsd4_decode_bitmap(argp, bmval)))
 		return status;
 
-	/*
-	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
-	 * read-only attributes return ERR_INVAL.
-	 */
-	if ((bmval[0] & ~nfsd_suppattrs0(argp->minorversion)) ||
-	    (bmval[1] & ~nfsd_suppattrs1(argp->minorversion)) ||
-	    (bmval[2] & ~nfsd_suppattrs2(argp->minorversion)))
-		return nfserr_attrnotsupp;
-	if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
-	    (bmval[2] & ~writable[2]))
-		return nfserr_inval;
-
 	READ_BUF(4);
 	READ32(expected_len);
 
@@ -424,8 +390,11 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, u32 *writable,
 			goto xdr_error;
 		}
 	}
-	BUG_ON(bmval[2]);	/* no such writeable attr supported yet */
-	if (len != expected_len)
+	if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
+	    || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
+	    || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
+		READ_BUF(expected_len - len);
+	else if (len != expected_len)
 		goto xdr_error;
 
 	DECODE_TAIL;
@@ -518,8 +487,8 @@ nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create
 	if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 		return status;
 
-	status = nfsd4_decode_fattr(argp, create->cr_bmval, nfsd_attrmask,
-				    &create->cr_iattr, &create->cr_acl);
+	status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
+				    &create->cr_acl);
 	if (status)
 		goto out;
 
@@ -682,7 +651,7 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 		case NFS4_CREATE_UNCHECKED:
 		case NFS4_CREATE_GUARDED:
 			status = nfsd4_decode_fattr(argp, open->op_bmval,
-				nfsd_attrmask, &open->op_iattr, &open->op_acl);
+				&open->op_iattr, &open->op_acl);
 			if (status)
 				goto out;
 			break;
@@ -696,8 +665,7 @@ nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 			READ_BUF(8);
 			COPYMEM(open->op_verf.data, 8);
 			status = nfsd4_decode_fattr(argp, open->op_bmval,
-				nfsd41_ex_attrmask, &open->op_iattr,
-				&open->op_acl);
+				&open->op_iattr, &open->op_acl);
 			if (status)
 				goto out;
 			break;
@@ -893,8 +861,8 @@ nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *seta
 	status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 	if (status)
 		return status;
-	return nfsd4_decode_fattr(argp, setattr->sa_bmval, nfsd_attrmask,
-				  &setattr->sa_iattr, &setattr->sa_acl);
+	return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
+				  &setattr->sa_acl);
 }
 
 static __be32
@@ -1328,64 +1296,64 @@ static nfsd4_dec nfsd4_dec_ops[] = {
 };
 
 static nfsd4_dec nfsd41_dec_ops[] = {
-	[OP_ACCESS]		(nfsd4_dec)nfsd4_decode_access,
-	[OP_CLOSE]		(nfsd4_dec)nfsd4_decode_close,
-	[OP_COMMIT]		(nfsd4_dec)nfsd4_decode_commit,
-	[OP_CREATE]		(nfsd4_dec)nfsd4_decode_create,
-	[OP_DELEGPURGE]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_DELEGRETURN]	(nfsd4_dec)nfsd4_decode_delegreturn,
-	[OP_GETATTR]		(nfsd4_dec)nfsd4_decode_getattr,
-	[OP_GETFH]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_LINK]		(nfsd4_dec)nfsd4_decode_link,
-	[OP_LOCK]		(nfsd4_dec)nfsd4_decode_lock,
-	[OP_LOCKT]		(nfsd4_dec)nfsd4_decode_lockt,
-	[OP_LOCKU]		(nfsd4_dec)nfsd4_decode_locku,
-	[OP_LOOKUP]		(nfsd4_dec)nfsd4_decode_lookup,
-	[OP_LOOKUPP]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_NVERIFY]		(nfsd4_dec)nfsd4_decode_verify,
-	[OP_OPEN]		(nfsd4_dec)nfsd4_decode_open,
-	[OP_OPENATTR]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_OPEN_CONFIRM]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_OPEN_DOWNGRADE]	(nfsd4_dec)nfsd4_decode_open_downgrade,
-	[OP_PUTFH]		(nfsd4_dec)nfsd4_decode_putfh,
-	[OP_PUTPUBFH]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_PUTROOTFH]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_READ]		(nfsd4_dec)nfsd4_decode_read,
-	[OP_READDIR]		(nfsd4_dec)nfsd4_decode_readdir,
-	[OP_READLINK]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_REMOVE]		(nfsd4_dec)nfsd4_decode_remove,
-	[OP_RENAME]		(nfsd4_dec)nfsd4_decode_rename,
-	[OP_RENEW]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_RESTOREFH]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_SAVEFH]		(nfsd4_dec)nfsd4_decode_noop,
-	[OP_SECINFO]		(nfsd4_dec)nfsd4_decode_secinfo,
-	[OP_SETATTR]		(nfsd4_dec)nfsd4_decode_setattr,
-	[OP_SETCLIENTID]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_SETCLIENTID_CONFIRM](nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_VERIFY]		(nfsd4_dec)nfsd4_decode_verify,
-	[OP_WRITE]		(nfsd4_dec)nfsd4_decode_write,
-	[OP_RELEASE_LOCKOWNER]	(nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
+	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
+	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
+	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
+	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
+	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
+	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
+	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
+	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
+	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
+	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
+	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
+	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
+	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
+	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
+	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
+	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
+	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
+	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
+	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
+	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
+	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
+	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
+	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
+	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_notsupp,
 
 	/* new operations for NFSv4.1 */
-	[OP_BACKCHANNEL_CTL]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_BIND_CONN_TO_SESSION](nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_EXCHANGE_ID]	(nfsd4_dec)nfsd4_decode_exchange_id,
-	[OP_CREATE_SESSION]	(nfsd4_dec)nfsd4_decode_create_session,
-	[OP_DESTROY_SESSION]	(nfsd4_dec)nfsd4_decode_destroy_session,
-	[OP_FREE_STATEID]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_GET_DIR_DELEGATION]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_GETDEVICEINFO]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_GETDEVICELIST]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_LAYOUTCOMMIT]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_LAYOUTGET]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_LAYOUTRETURN]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_SECINFO_NO_NAME]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_SEQUENCE]		(nfsd4_dec)nfsd4_decode_sequence,
-	[OP_SET_SSV]		(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_TEST_STATEID]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_WANT_DELEGATION]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_DESTROY_CLIENTID]	(nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_RECLAIM_COMPLETE]	(nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_BACKCHANNEL_CTL]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_EXCHANGE_ID]	= (nfsd4_dec)nfsd4_decode_exchange_id,
+	[OP_CREATE_SESSION]	= (nfsd4_dec)nfsd4_decode_create_session,
+	[OP_DESTROY_SESSION]	= (nfsd4_dec)nfsd4_decode_destroy_session,
+	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_GET_DIR_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_GETDEVICEINFO]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_GETDEVICELIST]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_LAYOUTCOMMIT]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_LAYOUTGET]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_LAYOUTRETURN]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_SECINFO_NO_NAME]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_SEQUENCE]		= (nfsd4_dec)nfsd4_decode_sequence,
+	[OP_SET_SSV]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_TEST_STATEID]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_WANT_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_DESTROY_CLIENTID]	= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_RECLAIM_COMPLETE]	= (nfsd4_dec)nfsd4_decode_notsupp,
 };
 
 struct nfsd4_minorversion_ops {
@@ -1489,21 +1457,6 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 
 	DECODE_TAIL;
 }
-/*
- * END OF "GENERIC" DECODE ROUTINES.
- */
-
-/*
- * START OF "GENERIC" ENCODE ROUTINES.
- *   These may look a little ugly since they are imported from a "generic"
- * set of XDR encode/decode routines which are intended to be shared by
- * all of our NFSv4 implementations (OpenBSD, MacOS X...).
- *
- * If the pain of reading these is too great, it should be a straightforward
- * task to translate them into Linux-specific versions which are more
- * consistent with the style used in NFSv2/v3...
- */
-#define ENCODE_HEAD              __be32 *p
 
 #define WRITE32(n)               *p++ = htonl(n)
 #define WRITE64(n)               do {				\
@@ -1515,13 +1468,41 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 	memcpy(p, ptr, nbytes);					\
 	p += XDR_QUADLEN(nbytes);				\
 }} while (0)
-#define WRITECINFO(c)		do {				\
-	*p++ = htonl(c.atomic);					\
-	*p++ = htonl(c.before_ctime_sec);				\
-	*p++ = htonl(c.before_ctime_nsec);				\
-	*p++ = htonl(c.after_ctime_sec);				\
-	*p++ = htonl(c.after_ctime_nsec);				\
-} while (0)
+
+static void write32(__be32 **p, u32 n)
+{
+	*(*p)++ = n;
+}
+
+static void write64(__be32 **p, u64 n)
+{
+	write32(p, (u32)(n >> 32));
+	write32(p, (u32)n);
+}
+
+static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
+{
+	if (IS_I_VERSION(inode)) {
+		write64(p, inode->i_version);
+	} else {
+		write32(p, stat->ctime.tv_sec);
+		write32(p, stat->ctime.tv_nsec);
+	}
+}
+
+static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
+{
+	write32(p, c->atomic);
+	if (c->change_supported) {
+		write64(p, c->before_change);
+		write64(p, c->after_change);
+	} else {
+		write32(p, c->before_ctime_sec);
+		write32(p, c->before_ctime_nsec);
+		write32(p, c->after_ctime_sec);
+		write32(p, c->after_ctime_nsec);
+	}
+}
 
 #define RESERVE_SPACE(nbytes)	do {				\
 	p = resp->p;						\
@@ -1874,16 +1855,9 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
 	}
 	if (bmval0 & FATTR4_WORD0_CHANGE) {
-		/*
-		 * Note: This _must_ be consistent with the scheme for writing
-		 * change_info, so any changes made here must be reflected there
-		 * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
-		 * macro above.)
-		 */
 		if ((buflen -= 8) < 0)
 			goto out_resource;
-		WRITE32(stat.ctime.tv_sec);
-		WRITE32(stat.ctime.tv_nsec);
+		write_change(&p, &stat, dentry->d_inode);
 	}
 	if (bmval0 & FATTR4_WORD0_SIZE) {
 		if ((buflen -= 8) < 0)
@@ -2348,7 +2322,7 @@ fail:
 static void
 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	RESERVE_SPACE(sizeof(stateid_t));
 	WRITE32(sid->si_generation);
@@ -2359,7 +2333,7 @@ nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
 static __be32
 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(8);
@@ -2386,7 +2360,7 @@ nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_c
 static __be32
 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(8);
@@ -2399,11 +2373,11 @@ nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
 static __be32
 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(32);
-		WRITECINFO(create->cr_cinfo);
+		write_cinfo(&p, &create->cr_cinfo);
 		WRITE32(2);
 		WRITE32(create->cr_bmval[0]);
 		WRITE32(create->cr_bmval[1]);
@@ -2435,7 +2409,7 @@ nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh
 {
 	struct svc_fh *fhp = *fhpp;
 	unsigned int len;
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		len = fhp->fh_handle.fh_size;
@@ -2454,7 +2428,7 @@ nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh
 static void
 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
 	WRITE64(ld->ld_start);
@@ -2510,11 +2484,11 @@ nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_l
 static __be32
 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(20);
-		WRITECINFO(link->li_cinfo);
+		write_cinfo(&p, &link->li_cinfo);
 		ADJUST_ARGS();
 	}
 	return nfserr;
@@ -2524,7 +2498,7 @@ nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_li
 static __be32
 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 	ENCODE_SEQID_OP_HEAD;
 
 	if (nfserr)
@@ -2532,7 +2506,7 @@ nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_op
 
 	nfsd4_encode_stateid(resp, &open->op_stateid);
 	RESERVE_SPACE(40);
-	WRITECINFO(open->op_cinfo);
+	write_cinfo(&p, &open->op_cinfo);
 	WRITE32(open->op_rflags);
 	WRITE32(2);
 	WRITE32(open->op_bmval[0]);
@@ -2619,7 +2593,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
 	int v, pn;
 	unsigned long maxcount; 
 	long len;
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		return nfserr;
@@ -2681,7 +2655,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
 {
 	int maxcount;
 	char *page;
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		return nfserr;
@@ -2730,7 +2704,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
 	int maxcount;
 	loff_t offset;
 	__be32 *page, *savep, *tailbase;
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		return nfserr;
@@ -2806,11 +2780,11 @@ err_no_verf:
 static __be32
 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(20);
-		WRITECINFO(remove->rm_cinfo);
+		write_cinfo(&p, &remove->rm_cinfo);
 		ADJUST_ARGS();
 	}
 	return nfserr;
@@ -2819,12 +2793,12 @@ nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
 static __be32
 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(40);
-		WRITECINFO(rename->rn_sinfo);
-		WRITECINFO(rename->rn_tinfo);
+		write_cinfo(&p, &rename->rn_sinfo);
+		write_cinfo(&p, &rename->rn_tinfo);
 		ADJUST_ARGS();
 	}
 	return nfserr;
@@ -2839,7 +2813,7 @@ nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
 	u32 nflavs;
 	struct exp_flavor_info *flavs;
 	struct exp_flavor_info def_flavs[2];
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		goto out;
@@ -2904,7 +2878,7 @@ out:
 static __be32
 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	RESERVE_SPACE(12);
 	if (nfserr) {
@@ -2924,7 +2898,7 @@ nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
 static __be32
 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(8 + sizeof(nfs4_verifier));
@@ -2944,7 +2918,7 @@ nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct n
 static __be32
 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (!nfserr) {
 		RESERVE_SPACE(16);
@@ -2960,7 +2934,7 @@ static __be32
 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
 			 struct nfsd4_exchange_id *exid)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 	char *major_id;
 	char *server_scope;
 	int major_id_sz;
@@ -3015,7 +2989,7 @@ static __be32
 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
 			    struct nfsd4_create_session *sess)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		return nfserr;
@@ -3071,7 +3045,7 @@ __be32
 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
 		      struct nfsd4_sequence *seq)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 
 	if (nfserr)
 		return nfserr;
@@ -3219,7 +3193,7 @@ void
 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
 {
 	__be32 *statp;
-	ENCODE_HEAD;
+	__be32 *p;
 
 	RESERVE_SPACE(8);
 	WRITE32(op->opnum);
@@ -3253,7 +3227,7 @@ status:
 void
 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
 {
-	ENCODE_HEAD;
+	__be32 *p;
 	struct nfs4_replay *rp = op->replay;
 
 	BUG_ON(!rp);
@@ -3268,10 +3242,6 @@ nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
 	ADJUST_ARGS();
 }
 
-/*
- * END OF "GENERIC" ENCODE ROUTINES.
- */
-
 int
 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 {
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 5bfc2ac..4638635 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -29,15 +29,24 @@
  */
 #define CACHESIZE		1024
 #define HASHSIZE		64
-#define REQHASH(xid)		(((((__force __u32)xid) >> 24) ^ ((__force __u32)xid)) & (HASHSIZE-1))
 
-static struct hlist_head *	hash_list;
+static struct hlist_head *	cache_hash;
 static struct list_head 	lru_head;
 static int			cache_disabled = 1;
 
+/*
+ * Calculate the hash index from an XID.
+ */
+static inline u32 request_hash(u32 xid)
+{
+	u32 h = xid;
+	h ^= (xid >> 24);
+	return h & (HASHSIZE-1);
+}
+
 static int	nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *vec);
 
-/* 
+/*
  * locking for the reply cache:
  * A cache entry is "single use" if c_state == RC_INPROG
  * Otherwise, it when accessing _prev or _next, the lock must be held.
@@ -62,8 +71,8 @@ int nfsd_reply_cache_init(void)
 		i--;
 	}
 
-	hash_list = kcalloc (HASHSIZE, sizeof(struct hlist_head), GFP_KERNEL);
-	if (!hash_list)
+	cache_hash = kcalloc (HASHSIZE, sizeof(struct hlist_head), GFP_KERNEL);
+	if (!cache_hash)
 		goto out_nomem;
 
 	cache_disabled = 0;
@@ -88,8 +97,8 @@ void nfsd_reply_cache_shutdown(void)
 
 	cache_disabled = 1;
 
-	kfree (hash_list);
-	hash_list = NULL;
+	kfree (cache_hash);
+	cache_hash = NULL;
 }
 
 /*
@@ -108,7 +117,7 @@ static void
 hash_refile(struct svc_cacherep *rp)
 {
 	hlist_del_init(&rp->c_hash);
-	hlist_add_head(&rp->c_hash, hash_list + REQHASH(rp->c_xid));
+	hlist_add_head(&rp->c_hash, cache_hash + request_hash(rp->c_xid));
 }
 
 /*
@@ -138,7 +147,7 @@ nfsd_cache_lookup(struct svc_rqst *rqstp, int type)
 	spin_lock(&cache_lock);
 	rtn = RC_DOIT;
 
-	rh = &hash_list[REQHASH(xid)];
+	rh = &cache_hash[request_hash(xid)];
 	hlist_for_each_entry(rp, hn, rh, c_hash) {
 		if (rp->c_state != RC_UNUSED &&
 		    xid == rp->c_xid && proc == rp->c_proc &&
@@ -165,8 +174,8 @@ nfsd_cache_lookup(struct svc_rqst *rqstp, int type)
 	}
 	}
 
-	/* This should not happen */
-	if (rp == NULL) {
+	/* All entries on the LRU are in-progress. This should not happen */
+	if (&rp->c_lru == &lru_head) {
 		static int	complaints;
 
 		printk(KERN_WARNING "nfsd: all repcache entries locked!\n");
@@ -264,7 +273,7 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
 
 	len = resv->iov_len - ((char*)statp - (char*)resv->iov_base);
 	len >>= 2;
-	
+
 	/* Don't cache excessive amounts of data and XDR failures */
 	if (!statp || len > (256 >> 2)) {
 		rp->c_state = RC_UNUSED;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index af16849..877e713 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -695,8 +695,9 @@ static ssize_t write_threads(struct file *file, char *buf, size_t size)
 		if (rv)
 			return rv;
 	}
-	sprintf(buf, "%d\n", nfsd_nrthreads());
-	return strlen(buf);
+
+	return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
+							nfsd_nrthreads());
 }
 
 /**
@@ -793,7 +794,7 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 {
 	char *mesg = buf;
 	char *vers, *minorp, sign;
-	int len, num;
+	int len, num, remaining;
 	unsigned minor;
 	ssize_t tlen = 0;
 	char *sep;
@@ -840,32 +841,50 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 			}
 		next:
 			vers += len + 1;
-			tlen += len;
 		} while ((len = qword_get(&mesg, vers, size)) > 0);
 		/* If all get turned off, turn them back on, as
 		 * having no versions is BAD
 		 */
 		nfsd_reset_versions();
 	}
+
 	/* Now write current state into reply buffer */
 	len = 0;
 	sep = "";
+	remaining = SIMPLE_TRANSACTION_LIMIT;
 	for (num=2 ; num <= 4 ; num++)
 		if (nfsd_vers(num, NFSD_AVAIL)) {
-			len += sprintf(buf+len, "%s%c%d", sep,
+			len = snprintf(buf, remaining, "%s%c%d", sep,
 				       nfsd_vers(num, NFSD_TEST)?'+':'-',
 				       num);
 			sep = " ";
+
+			if (len > remaining)
+				break;
+			remaining -= len;
+			buf += len;
+			tlen += len;
 		}
 	if (nfsd_vers(4, NFSD_AVAIL))
-		for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; minor++)
-			len += sprintf(buf+len, " %c4.%u",
+		for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
+		     minor++) {
+			len = snprintf(buf, remaining, " %c4.%u",
 					(nfsd_vers(4, NFSD_TEST) &&
 					 nfsd_minorversion(minor, NFSD_TEST)) ?
 						'+' : '-',
 					minor);
-	len += sprintf(buf+len, "\n");
-	return len;
+
+			if (len > remaining)
+				break;
+			remaining -= len;
+			buf += len;
+			tlen += len;
+		}
+
+	len = snprintf(buf, remaining, "\n");
+	if (len > remaining)
+		return -EINVAL;
+	return tlen + len;
 }
 
 /**
@@ -910,104 +929,143 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size)
 	return rv;
 }
 
-static ssize_t __write_ports(struct file *file, char *buf, size_t size)
+/*
+ * Zero-length write.  Return a list of NFSD's current listener
+ * transports.
+ */
+static ssize_t __write_ports_names(char *buf)
 {
-	if (size == 0) {
-		int len = 0;
+	if (nfsd_serv == NULL)
+		return 0;
+	return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
+}
 
-		if (nfsd_serv)
-			len = svc_xprt_names(nfsd_serv, buf, 0);
-		return len;
-	}
-	/* Either a single 'fd' number is written, in which
-	 * case it must be for a socket of a supported family/protocol,
-	 * and we use it as an nfsd socket, or
-	 * A '-' followed by the 'name' of a socket in which case
-	 * we close the socket.
-	 */
-	if (isdigit(buf[0])) {
-		char *mesg = buf;
-		int fd;
-		int err;
-		err = get_int(&mesg, &fd);
-		if (err)
-			return -EINVAL;
-		if (fd < 0)
-			return -EINVAL;
-		err = nfsd_create_serv();
-		if (!err) {
-			err = svc_addsock(nfsd_serv, fd, buf);
-			if (err >= 0) {
-				err = lockd_up();
-				if (err < 0)
-					svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
-			}
-			/* Decrease the count, but don't shutdown the
-			 * the service
-			 */
-			nfsd_serv->sv_nrthreads--;
-		}
-		return err < 0 ? err : 0;
-	}
-	if (buf[0] == '-' && isdigit(buf[1])) {
-		char *toclose = kstrdup(buf+1, GFP_KERNEL);
-		int len = 0;
-		if (!toclose)
-			return -ENOMEM;
-		if (nfsd_serv)
-			len = svc_sock_names(buf, nfsd_serv, toclose);
-		if (len >= 0)
-			lockd_down();
-		kfree(toclose);
-		return len;
-	}
-	/*
-	 * Add a transport listener by writing it's transport name
-	 */
-	if (isalpha(buf[0])) {
-		int err;
-		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, PF_INET, port,
-						      SVC_SOCK_ANONYMOUS);
-				if (err == -ENOENT)
-					/* Give a reasonable perror msg for
-					 * bad transport string */
-					err = -EPROTONOSUPPORT;
-			}
-			return err < 0 ? err : 0;
-		}
-	}
-	/*
-	 * Remove a transport by writing it's transport name and port number
-	 */
-	if (buf[0] == '-' && isalpha(buf[1])) {
-		struct svc_xprt *xprt;
-		int err = -EINVAL;
-		char transport[16];
-		int port;
-		if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
-			if (port < 1 || port > 65535)
-				return -EINVAL;
-			if (nfsd_serv) {
-				xprt = svc_find_xprt(nfsd_serv, transport,
-						     AF_UNSPEC, port);
-				if (xprt) {
-					svc_close_xprt(xprt);
-					svc_xprt_put(xprt);
-					err = 0;
-				} else
-					err = -ENOTCONN;
-			}
-			return err < 0 ? err : 0;
-		}
+/*
+ * A single 'fd' number was written, in which case it must be for
+ * a socket of a supported family/protocol, and we use it as an
+ * nfsd listener.
+ */
+static ssize_t __write_ports_addfd(char *buf)
+{
+	char *mesg = buf;
+	int fd, err;
+
+	err = get_int(&mesg, &fd);
+	if (err != 0 || fd < 0)
+		return -EINVAL;
+
+	err = nfsd_create_serv();
+	if (err != 0)
+		return err;
+
+	err = lockd_up();
+	if (err != 0)
+		goto out;
+
+	err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
+	if (err < 0)
+		lockd_down();
+
+out:
+	/* Decrease the count, but don't shut down the service */
+	nfsd_serv->sv_nrthreads--;
+	return err;
+}
+
+/*
+ * A '-' followed by the 'name' of a socket means we close the socket.
+ */
+static ssize_t __write_ports_delfd(char *buf)
+{
+	char *toclose;
+	int len = 0;
+
+	toclose = kstrdup(buf + 1, GFP_KERNEL);
+	if (toclose == NULL)
+		return -ENOMEM;
+
+	if (nfsd_serv != NULL)
+		len = svc_sock_names(nfsd_serv, buf,
+					SIMPLE_TRANSACTION_LIMIT, toclose);
+	if (len >= 0)
+		lockd_down();
+
+	kfree(toclose);
+	return len;
+}
+
+/*
+ * A transport listener is added by writing it's transport name and
+ * a port number.
+ */
+static ssize_t __write_ports_addxprt(char *buf)
+{
+	char transport[16];
+	int port, err;
+
+	if (sscanf(buf, "%15s %4u", transport, &port) != 2)
+		return -EINVAL;
+
+	if (port < 1 || port > USHORT_MAX)
+		return -EINVAL;
+
+	err = nfsd_create_serv();
+	if (err != 0)
+		return err;
+
+	err = svc_create_xprt(nfsd_serv, transport,
+				PF_INET, port, SVC_SOCK_ANONYMOUS);
+	if (err < 0) {
+		/* Give a reasonable perror msg for bad transport string */
+		if (err == -ENOENT)
+			err = -EPROTONOSUPPORT;
+		return err;
 	}
+	return 0;
+}
+
+/*
+ * A transport listener is removed by writing a "-", it's transport
+ * name, and it's port number.
+ */
+static ssize_t __write_ports_delxprt(char *buf)
+{
+	struct svc_xprt *xprt;
+	char transport[16];
+	int port;
+
+	if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
+		return -EINVAL;
+
+	if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
+		return -EINVAL;
+
+	xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
+	if (xprt == NULL)
+		return -ENOTCONN;
+
+	svc_close_xprt(xprt);
+	svc_xprt_put(xprt);
+	return 0;
+}
+
+static ssize_t __write_ports(struct file *file, char *buf, size_t size)
+{
+	if (size == 0)
+		return __write_ports_names(buf);
+
+	if (isdigit(buf[0]))
+		return __write_ports_addfd(buf);
+
+	if (buf[0] == '-' && isdigit(buf[1]))
+		return __write_ports_delfd(buf);
+
+	if (isalpha(buf[0]))
+		return __write_ports_addxprt(buf);
+
+	if (buf[0] == '-' && isalpha(buf[1]))
+		return __write_ports_delxprt(buf);
+
 	return -EINVAL;
 }
 
@@ -1030,7 +1088,9 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size)
  *			buf:		C string containing an unsigned
  *					integer value representing a bound
  *					but unconnected socket that is to be
- *					used as an NFSD listener
+ *					used as an NFSD listener; listen(3)
+ *					must be called for a SOCK_STREAM
+ *					socket, otherwise it is ignored
  *			size:		non-zero length of C string in @buf
  * Output:
  *	On success:	NFS service is started;
@@ -1138,7 +1198,9 @@ static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
 		nfsd_max_blksize = bsize;
 		mutex_unlock(&nfsd_mutex);
 	}
-	return sprintf(buf, "%d\n", nfsd_max_blksize);
+
+	return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
+							nfsd_max_blksize);
 }
 
 #ifdef CONFIG_NFSD_V4
@@ -1162,8 +1224,9 @@ static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
 			return -EINVAL;
 		nfs4_reset_lease(lease);
 	}
-	sprintf(buf, "%ld\n", nfs4_lease_time());
-	return strlen(buf);
+
+	return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
+							nfs4_lease_time());
 }
 
 /**
@@ -1219,8 +1282,9 @@ static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
 
 		status = nfs4_reset_recoverydir(recdir);
 	}
-	sprintf(buf, "%s\n", nfs4_recoverydir());
-	return strlen(buf);
+
+	return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
+							nfs4_recoverydir());
 }
 
 /**
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 9f1ca17..8847f3f 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -27,9 +27,6 @@
 #define NFSDDBG_FACILITY		NFSDDBG_FH
 
 
-static int nfsd_nr_verified;
-static int nfsd_nr_put;
-
 /*
  * our acceptability function.
  * if NOSUBTREECHECK, accept anything
@@ -251,7 +248,6 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
 
 	fhp->fh_dentry = dentry;
 	fhp->fh_export = exp;
-	nfsd_nr_verified++;
 	return 0;
 out:
 	exp_put(exp);
@@ -552,7 +548,6 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
 			return nfserr_opnotsupp;
 	}
 
-	nfsd_nr_verified++;
 	return 0;
 }
 
@@ -609,7 +604,6 @@ fh_put(struct svc_fh *fhp)
 		fhp->fh_pre_saved = 0;
 		fhp->fh_post_saved = 0;
 #endif
-		nfsd_nr_put++;
 	}
 	if (exp) {
 		cache_put(&exp->h, &svc_export_cache);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3b534e5..58e843b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1108,6 +1108,7 @@ extern void locks_copy_lock(struct file_lock *, struct file_lock *);
 extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
 extern void locks_remove_posix(struct file *, fl_owner_t);
 extern void locks_remove_flock(struct file *);
+extern void locks_release_private(struct file_lock *);
 extern void posix_test_lock(struct file *, struct file_lock *);
 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
 extern int posix_lock_file_wait(struct file *, struct file_lock *);
diff --git a/include/linux/nfsd/cache.h b/include/linux/nfsd/cache.h
index 5bccaab..3a3f589 100644
--- a/include/linux/nfsd/cache.h
+++ b/include/linux/nfsd/cache.h
@@ -14,8 +14,7 @@
 #include <linux/uio.h>
 
 /*
- * Representation of a reply cache entry. The first two members *must*
- * be hash_next and hash_prev.
+ * Representation of a reply cache entry.
  */
 struct svc_cacherep {
 	struct hlist_node	c_hash;
diff --git a/include/linux/nfsd/nfsfh.h b/include/linux/nfsd/nfsfh.h
index afa1901..8f641c9 100644
--- a/include/linux/nfsd/nfsfh.h
+++ b/include/linux/nfsd/nfsfh.h
@@ -151,9 +151,15 @@ typedef struct svc_fh {
 	__u64			fh_pre_size;	/* size before operation */
 	struct timespec		fh_pre_mtime;	/* mtime before oper */
 	struct timespec		fh_pre_ctime;	/* ctime before oper */
+	/*
+	 * pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
+	 *  to find out if it is valid.
+	 */
+	u64			fh_pre_change;
 
 	/* Post-op attributes saved in fh_unlock */
 	struct kstat		fh_post_attr;	/* full attrs after operation */
+	u64			fh_post_change; /* nfsv4 change; see above */
 #endif /* CONFIG_NFSD_V3 */
 
 } svc_fh;
@@ -298,6 +304,7 @@ fill_pre_wcc(struct svc_fh *fhp)
 		fhp->fh_pre_mtime = inode->i_mtime;
 		fhp->fh_pre_ctime = inode->i_ctime;
 		fhp->fh_pre_size  = inode->i_size;
+		fhp->fh_pre_change = inode->i_version;
 		fhp->fh_pre_saved = 1;
 	}
 }
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 4d61c87..c0c4921 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -61,15 +61,6 @@ typedef struct {
 #define si_stateownerid   si_opaque.so_stateownerid
 #define si_fileid         si_opaque.so_fileid
 
-
-struct nfs4_cb_recall {
-	u32			cbr_ident;
-	int			cbr_trunc;
-	stateid_t		cbr_stateid;
-	struct knfsd_fh		cbr_fh;
-	struct nfs4_delegation	*cbr_dp;
-};
-
 struct nfs4_delegation {
 	struct list_head	dl_perfile;
 	struct list_head	dl_perclnt;
@@ -81,14 +72,15 @@ struct nfs4_delegation {
 	struct file		*dl_vfs_file;
 	u32			dl_type;
 	time_t			dl_time;
-	struct nfs4_cb_recall	dl_recall;
+/* For recall: */
+	u32			dl_ident;
+	stateid_t		dl_stateid;
+	struct knfsd_fh		dl_fh;
+	int			dl_retries;
 };
 
-#define dl_stateid      dl_recall.cbr_stateid
-#define dl_fh           dl_recall.cbr_fh
-
 /* client delegation callback info */
-struct nfs4_callback {
+struct nfs4_cb_conn {
 	/* SETCLIENTID info */
 	u32                     cb_addr;
 	unsigned short          cb_port;
@@ -97,6 +89,7 @@ struct nfs4_callback {
 	/* RPC client info */
 	atomic_t		cb_set;     /* successful CB_NULL call */
 	struct rpc_clnt *       cb_client;
+	struct rpc_cred	*	cb_cred;
 };
 
 /* Maximum number of slots per session. 128 is useful for long haul TCP */
@@ -185,7 +178,7 @@ struct nfs4_client {
 	struct svc_cred		cl_cred; 	/* setclientid principal */
 	clientid_t		cl_clientid;	/* generated by server */
 	nfs4_verifier		cl_confirm;	/* generated by server */
-	struct nfs4_callback	cl_callback;    /* callback info */
+	struct nfs4_cb_conn	cl_cb_conn;     /* callback info */
 	atomic_t		cl_count;	/* ref count */
 	u32			cl_firststate;	/* recovery dir creation */
 
diff --git a/include/linux/nfsd/xdr4.h b/include/linux/nfsd/xdr4.h
index f80d601..d0f050f 100644
--- a/include/linux/nfsd/xdr4.h
+++ b/include/linux/nfsd/xdr4.h
@@ -64,10 +64,13 @@ static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs)
 
 struct nfsd4_change_info {
 	u32		atomic;
+	bool		change_supported;
 	u32		before_ctime_sec;
 	u32		before_ctime_nsec;
+	u64		before_change;
 	u32		after_ctime_sec;
 	u32		after_ctime_nsec;
+	u64		after_change;
 };
 
 struct nfsd4_access {
@@ -503,10 +506,16 @@ set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
 {
 	BUG_ON(!fhp->fh_pre_saved || !fhp->fh_post_saved);
 	cinfo->atomic = 1;
-	cinfo->before_ctime_sec = fhp->fh_pre_ctime.tv_sec;
-	cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
-	cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
-	cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
+	cinfo->change_supported = IS_I_VERSION(fhp->fh_dentry->d_inode);
+	if (cinfo->change_supported) {
+		cinfo->before_change = fhp->fh_pre_change;
+		cinfo->after_change = fhp->fh_post_change;
+	} else {
+		cinfo->before_ctime_sec = fhp->fh_pre_ctime.tv_sec;
+		cinfo->before_ctime_nsec = fhp->fh_pre_ctime.tv_nsec;
+		cinfo->after_ctime_sec = fhp->fh_post_attr.ctime.tv_sec;
+		cinfo->after_ctime_nsec = fhp->fh_post_attr.ctime.tv_nsec;
+	}
 }
 
 int nfs4svc_encode_voidres(struct svc_rqst *, __be32 *, void *);
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 0d9cb6e..2223ae0 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -83,7 +83,7 @@ int	svc_port_is_privileged(struct sockaddr *sin);
 int	svc_print_xprts(char *buf, int maxlen);
 struct	svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 			const sa_family_t af, const unsigned short port);
-int	svc_xprt_names(struct svc_serv *serv, char *buf, int buflen);
+int	svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 
 static inline void svc_xprt_get(struct svc_xprt *xprt)
 {
@@ -118,7 +118,7 @@ static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 	return 0;
 }
 
-static inline size_t svc_addr_len(struct sockaddr *sa)
+static inline size_t svc_addr_len(const struct sockaddr *sa)
 {
 	switch (sa->sa_family) {
 	case AF_INET:
@@ -126,7 +126,8 @@ static inline size_t svc_addr_len(struct sockaddr *sa)
 	case AF_INET6:
 		return sizeof(struct sockaddr_in6);
 	}
-	return -EAFNOSUPPORT;
+
+	return 0;
 }
 
 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
index 483e103..8271631 100644
--- a/include/linux/sunrpc/svcsock.h
+++ b/include/linux/sunrpc/svcsock.h
@@ -38,8 +38,11 @@ int		svc_recv(struct svc_rqst *, long);
 int		svc_send(struct svc_rqst *);
 void		svc_drop(struct svc_rqst *);
 void		svc_sock_update_bufs(struct svc_serv *serv);
-int		svc_sock_names(char *buf, struct svc_serv *serv, char *toclose);
-int		svc_addsock(struct svc_serv *serv, int fd, char *name_return);
+int		svc_sock_names(struct svc_serv *serv, char *buf,
+					const size_t buflen,
+					const char *toclose);
+int		svc_addsock(struct svc_serv *serv, const int fd,
+					char *name_return, const size_t len);
 void		svc_init_xprt_sock(void);
 void		svc_cleanup_xprt_sock(void);
 
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index c200d92..6f33d33 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -11,6 +11,7 @@
 #include <net/sock.h>
 #include <linux/sunrpc/stats.h>
 #include <linux/sunrpc/svc_xprt.h>
+#include <linux/sunrpc/svcsock.h>
 
 #define RPCDBG_FACILITY	RPCDBG_SVCXPRT
 
@@ -1097,36 +1098,58 @@ struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 }
 EXPORT_SYMBOL_GPL(svc_find_xprt);
 
-/*
- * Format a buffer with a list of the active transports. A zero for
- * the buflen parameter disables target buffer overflow checking.
+static int svc_one_xprt_name(const struct svc_xprt *xprt,
+			     char *pos, int remaining)
+{
+	int len;
+
+	len = snprintf(pos, remaining, "%s %u\n",
+			xprt->xpt_class->xcl_name,
+			svc_xprt_local_port(xprt));
+	if (len >= remaining)
+		return -ENAMETOOLONG;
+	return len;
+}
+
+/**
+ * svc_xprt_names - format a buffer with a list of transport names
+ * @serv: pointer to an RPC service
+ * @buf: pointer to a buffer to be filled in
+ * @buflen: length of buffer to be filled in
+ *
+ * Fills in @buf with a string containing a list of transport names,
+ * each name terminated with '\n'.
+ *
+ * Returns positive length of the filled-in string on success; otherwise
+ * a negative errno value is returned if an error occurs.
  */
-int svc_xprt_names(struct svc_serv *serv, char *buf, int buflen)
+int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen)
 {
 	struct svc_xprt *xprt;
-	char xprt_str[64];
-	int totlen = 0;
-	int len;
+	int len, totlen;
+	char *pos;
 
 	/* Sanity check args */
 	if (!serv)
 		return 0;
 
 	spin_lock_bh(&serv->sv_lock);
+
+	pos = buf;
+	totlen = 0;
 	list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
-		len = snprintf(xprt_str, sizeof(xprt_str),
-			       "%s %d\n", xprt->xpt_class->xcl_name,
-			       svc_xprt_local_port(xprt));
-		/* If the string was truncated, replace with error string */
-		if (len >= sizeof(xprt_str))
-			strcpy(xprt_str, "name-too-long\n");
-		/* Don't overflow buffer */
-		len = strlen(xprt_str);
-		if (buflen && (len + totlen >= buflen))
+		len = svc_one_xprt_name(xprt, pos, buflen - totlen);
+		if (len < 0) {
+			*buf = '\0';
+			totlen = len;
+		}
+		if (len <= 0)
 			break;
-		strcpy(buf+totlen, xprt_str);
+
+		pos += len;
 		totlen += len;
 	}
+
 	spin_unlock_bh(&serv->sv_lock);
 	return totlen;
 }
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 9d50423..004a2f9 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -240,42 +240,76 @@ out:
 /*
  * Report socket names for nfsdfs
  */
-static int one_sock_name(char *buf, struct svc_sock *svsk)
+static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
 {
+	const struct sock *sk = svsk->sk_sk;
+	const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
+							"udp" : "tcp";
 	int len;
 
-	switch(svsk->sk_sk->sk_family) {
-	case AF_INET:
-		len = sprintf(buf, "ipv4 %s %pI4 %d\n",
-			      svsk->sk_sk->sk_protocol == IPPROTO_UDP ?
-			      "udp" : "tcp",
-			      &inet_sk(svsk->sk_sk)->rcv_saddr,
-			      inet_sk(svsk->sk_sk)->num);
+	switch (sk->sk_family) {
+	case PF_INET:
+		len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
+				proto_name,
+				&inet_sk(sk)->rcv_saddr,
+				inet_sk(sk)->num);
+		break;
+	case PF_INET6:
+		len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
+				proto_name,
+				&inet6_sk(sk)->rcv_saddr,
+				inet_sk(sk)->num);
 		break;
 	default:
-		len = sprintf(buf, "*unknown-%d*\n",
-			       svsk->sk_sk->sk_family);
+		len = snprintf(buf, remaining, "*unknown-%d*\n",
+				sk->sk_family);
+	}
+
+	if (len >= remaining) {
+		*buf = '\0';
+		return -ENAMETOOLONG;
 	}
 	return len;
 }
 
-int
-svc_sock_names(char *buf, struct svc_serv *serv, char *toclose)
+/**
+ * svc_sock_names - construct a list of listener names in a string
+ * @serv: pointer to RPC service
+ * @buf: pointer to a buffer to fill in with socket names
+ * @buflen: size of the buffer to be filled
+ * @toclose: pointer to '\0'-terminated C string containing the name
+ *		of a listener to be closed
+ *
+ * Fills in @buf with a '\n'-separated list of names of listener
+ * sockets.  If @toclose is not NULL, the socket named by @toclose
+ * is closed, and is not included in the output list.
+ *
+ * Returns positive length of the socket name string, or a negative
+ * errno value on error.
+ */
+int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
+		   const char *toclose)
 {
 	struct svc_sock *svsk, *closesk = NULL;
 	int len = 0;
 
 	if (!serv)
 		return 0;
+
 	spin_lock_bh(&serv->sv_lock);
 	list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
-		int onelen = one_sock_name(buf+len, svsk);
-		if (toclose && strcmp(toclose, buf+len) == 0)
+		int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
+		if (onelen < 0) {
+			len = onelen;
+			break;
+		}
+		if (toclose && strcmp(toclose, buf + len) == 0)
 			closesk = svsk;
 		else
 			len += onelen;
 	}
 	spin_unlock_bh(&serv->sv_lock);
+
 	if (closesk)
 		/* Should unregister with portmap, but you cannot
 		 * unregister just one protocol...
@@ -427,13 +461,14 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
 		long		all[SVC_PKTINFO_SPACE / sizeof(long)];
 	} buffer;
 	struct cmsghdr *cmh = &buffer.hdr;
-	int		err, len;
 	struct msghdr msg = {
 		.msg_name = svc_addr(rqstp),
 		.msg_control = cmh,
 		.msg_controllen = sizeof(buffer),
 		.msg_flags = MSG_DONTWAIT,
 	};
+	size_t len;
+	int err;
 
 	if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
 	    /* udp sockets need large rcvbuf as all pending
@@ -465,8 +500,8 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
 		return -EAGAIN;
 	}
 	len = svc_addr_len(svc_addr(rqstp));
-	if (len < 0)
-		return len;
+	if (len == 0)
+		return -EAFNOSUPPORT;
 	rqstp->rq_addrlen = len;
 	if (skb->tstamp.tv64 == 0) {
 		skb->tstamp = ktime_get_real();
@@ -1148,9 +1183,19 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	return svsk;
 }
 
-int svc_addsock(struct svc_serv *serv,
-		int fd,
-		char *name_return)
+/**
+ * svc_addsock - add a listener socket to an RPC service
+ * @serv: pointer to RPC service to which to add a new listener
+ * @fd: file descriptor of the new listener
+ * @name_return: pointer to buffer to fill in with name of listener
+ * @len: size of the buffer
+ *
+ * Fills in socket name and returns positive length of name if successful.
+ * Name is terminated with '\n'.  On error, returns a negative errno
+ * value.
+ */
+int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
+		const size_t len)
 {
 	int err = 0;
 	struct socket *so = sockfd_lookup(fd, &err);
@@ -1190,7 +1235,7 @@ int svc_addsock(struct svc_serv *serv,
 		sockfd_put(so);
 		return err;
 	}
-	return one_sock_name(name_return, svsk);
+	return svc_one_sock_name(svsk, name_return, len);
 }
 EXPORT_SYMBOL_GPL(svc_addsock);