Merge branch 'for-linus' of git://linux-nfs.org/~bfields/linux

* 'for-linus' of git://linux-nfs.org/~bfields/linux: (100 commits)
  SUNRPC: RPC program information is stored in unsigned integers
  SUNRPC: Move exported symbol definitions after function declaration part 2
  NLM: tear down RPC clients in nlm_shutdown_hosts
  SUNRPC: spin svc_rqst initialization to its own function
  nfsd: more careful input validation in nfsctl write methods
  lockd: minor log message fix
  knfsd: don't bother mapping putrootfh enoent to eperm
  rdma: makefile
  rdma: ONCRPC RDMA protocol marshalling
  rdma: SVCRDMA sendto
  rdma: SVCRDMA recvfrom
  rdma: SVCRDMA Core Transport Services
  rdma: SVCRDMA Transport Module
  rdma: SVCRMDA Header File
  svc: Add svc_xprt_names service to replace svc_sock_names
  knfsd: Support adding transports by writing portlist file
  svc: Add svc API that queries for a transport instance
  svc: Add /proc/sys/sunrpc/transport files
  svc: Add transport hdr size for defer/revisit
  svc: Move the xprt independent code to the svc_xprt.c file
  ...

MAINTAINERS

@@ -2247,7 +2247,7 @@ P:	J. Bruce Fields
 M:	bfields@fieldses.org
 P:	Neil Brown
 M:	neilb@suse.de
-L:	nfs@lists.sourceforge.net
+L:	linux-nfs@vger.kernel.org
 W:	http://nfs.sourceforge.net/
 S:	Supported
 

fs/Kconfig

@@ -1674,6 +1674,8 @@ config NFSD
 	select CRYPTO_MD5 if NFSD_V4
 	select CRYPTO if NFSD_V4
 	select FS_POSIX_ACL if NFSD_V4
+	select PROC_FS if NFSD_V4
+	select PROC_FS if SUNRPC_GSS
 	help
 	  If you want your Linux box to act as an NFS *server*, so that other
 	  computers on your local network which support NFS can access certain

fs/lockd/host.c

@@ -34,10 +34,10 @@ static DEFINE_MUTEX(nlm_host_mutex);
 
 static void			nlm_gc_hosts(void);
 static struct nsm_handle *	__nsm_find(const struct sockaddr_in *,
-					const char *, int, int);
+					const char *, unsigned int, int);
 static struct nsm_handle *	nsm_find(const struct sockaddr_in *sin,
 					 const char *hostname,
-					 int hostname_len);
+					 unsigned int hostname_len);
 
 /*
  * Common host lookup routine for server & client
@@ -45,7 +45,8 @@ static struct nsm_handle *	nsm_find(const struct sockaddr_in *sin,
 static struct nlm_host *
 nlm_lookup_host(int server, const struct sockaddr_in *sin,
 		int proto, int version, const char *hostname,
-		int hostname_len, const struct sockaddr_in *ssin)
+		unsigned int hostname_len,
+		const struct sockaddr_in *ssin)
 {
 	struct hlist_head *chain;
 	struct hlist_node *pos;
@@ -176,7 +177,7 @@ nlm_destroy_host(struct nlm_host *host)
  */
 struct nlm_host *
 nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
-			const char *hostname, int hostname_len)
+			const char *hostname, unsigned int hostname_len)
 {
 	struct sockaddr_in ssin = {0};
 
@@ -189,7 +190,7 @@ nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
  */
 struct nlm_host *
 nlmsvc_lookup_host(struct svc_rqst *rqstp,
-			const char *hostname, int hostname_len)
+			const char *hostname, unsigned int hostname_len)
 {
 	struct sockaddr_in ssin = {0};
 
@@ -307,7 +308,8 @@ void nlm_release_host(struct nlm_host *host)
  * Release all resources held by that peer.
  */
 void nlm_host_rebooted(const struct sockaddr_in *sin,
-				const char *hostname, int hostname_len,
+				const char *hostname,
+				unsigned int hostname_len,
 				u32 new_state)
 {
 	struct hlist_head *chain;
@@ -377,8 +379,13 @@ nlm_shutdown_hosts(void)
 	/* First, make all hosts eligible for gc */
 	dprintk("lockd: nuking all hosts...\n");
 	for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
-		hlist_for_each_entry(host, pos, chain, h_hash)
+		hlist_for_each_entry(host, pos, chain, h_hash) {
 			host->h_expires = jiffies - 1;
+			if (host->h_rpcclnt) {
+				rpc_shutdown_client(host->h_rpcclnt);
+				host->h_rpcclnt = NULL;
+			}
+		}
 	}
 
 	/* Then, perform a garbage collection pass */
@@ -449,7 +456,7 @@ static DEFINE_MUTEX(nsm_mutex);
 
 static struct nsm_handle *
 __nsm_find(const struct sockaddr_in *sin,
-		const char *hostname, int hostname_len,
+		const char *hostname, unsigned int hostname_len,
 		int create)
 {
 	struct nsm_handle *nsm = NULL;
@@ -503,7 +510,8 @@ out:
 }
 
 static struct nsm_handle *
-nsm_find(const struct sockaddr_in *sin, const char *hostname, int hostname_len)
+nsm_find(const struct sockaddr_in *sin, const char *hostname,
+	 unsigned int hostname_len)
 {
 	return __nsm_find(sin, hostname, hostname_len, 1);
 }

fs/lockd/svc.c

@@ -219,19 +219,6 @@ lockd(struct svc_rqst *rqstp)
 	module_put_and_exit(0);
 }
 
-
-static int find_socket(struct svc_serv *serv, int proto)
-{
-	struct svc_sock *svsk;
-	int found = 0;
-	list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
-		if (svsk->sk_sk->sk_protocol == proto) {
-			found = 1;
-			break;
-		}
-	return found;
-}
-
 /*
  * Make any sockets that are needed but not present.
  * If nlm_udpport or nlm_tcpport were set as module
@@ -240,17 +227,25 @@ static int find_socket(struct svc_serv *serv, int proto)
 static int make_socks(struct svc_serv *serv, int proto)
 {
 	static int warned;
+	struct svc_xprt *xprt;
 	int err = 0;
 
-	if (proto == IPPROTO_UDP || nlm_udpport)
-		if (!find_socket(serv, IPPROTO_UDP))
-			err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport,
-						SVC_SOCK_DEFAULTS);
-	if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport))
-		if (!find_socket(serv, IPPROTO_TCP))
-			err = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport,
-						SVC_SOCK_DEFAULTS);
-
+	if (proto == IPPROTO_UDP || nlm_udpport) {
+		xprt = svc_find_xprt(serv, "udp", 0, 0);
+		if (!xprt)
+			err = svc_create_xprt(serv, "udp", nlm_udpport,
+					      SVC_SOCK_DEFAULTS);
+		else
+			svc_xprt_put(xprt);
+	}
+	if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport)) {
+		xprt = svc_find_xprt(serv, "tcp", 0, 0);
+		if (!xprt)
+			err = svc_create_xprt(serv, "tcp", nlm_tcpport,
+					      SVC_SOCK_DEFAULTS);
+		else
+			svc_xprt_put(xprt);
+	}
 	if (err >= 0) {
 		warned = 0;
 		err = 0;

fs/lockd/svc4proc.c

@@ -84,6 +84,7 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
+	int rc = rpc_success;
 
 	dprintk("lockd: TEST4        called\n");
 	resp->cookie = argp->cookie;
@@ -91,7 +92,7 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Don't accept test requests during grace period */
 	if (nlmsvc_grace_period) {
 		resp->status = nlm_lck_denied_grace_period;
-		return rpc_success;
+		return rc;
 	}
 
 	/* Obtain client and file */
@@ -101,12 +102,13 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Now check for conflicting locks */
 	resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
 	if (resp->status == nlm_drop_reply)
-		return rpc_drop_reply;
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: TEST4        status %d\n", ntohl(resp->status));
 
-	dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
-	return rpc_success;
+	return rc;
 }
 
 static __be32
@@ -115,6 +117,7 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
+	int rc = rpc_success;
 
 	dprintk("lockd: LOCK          called\n");
 
@@ -123,7 +126,7 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Don't accept new lock requests during grace period */
 	if (nlmsvc_grace_period && !argp->reclaim) {
 		resp->status = nlm_lck_denied_grace_period;
-		return rpc_success;
+		return rc;
 	}
 
 	/* Obtain client and file */
@@ -146,12 +149,13 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 	resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
 					argp->block, &argp->cookie);
 	if (resp->status == nlm_drop_reply)
-		return rpc_drop_reply;
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));
 
-	dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
-	return rpc_success;
+	return rc;
 }
 
 static __be32

fs/lockd/svclock.c

@@ -501,25 +501,29 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
 			block, block->b_flags, block->b_fl);
 		if (block->b_flags & B_TIMED_OUT) {
 			nlmsvc_unlink_block(block);
-			return nlm_lck_denied;
+			ret = nlm_lck_denied;
+			goto out;
 		}
 		if (block->b_flags & B_GOT_CALLBACK) {
+			nlmsvc_unlink_block(block);
 			if (block->b_fl != NULL
 					&& block->b_fl->fl_type != F_UNLCK) {
 				lock->fl = *block->b_fl;
 				goto conf_lock;
-			}
-			else {
-				nlmsvc_unlink_block(block);
-				return nlm_granted;
+			} else {
+				ret = nlm_granted;
+				goto out;
 			}
 		}
-		return nlm_drop_reply;
+		ret = nlm_drop_reply;
+		goto out;
 	}
 
 	error = vfs_test_lock(file->f_file, &lock->fl);
-	if (error == -EINPROGRESS)
-		return nlmsvc_defer_lock_rqst(rqstp, block);
+	if (error == -EINPROGRESS) {
+		ret = nlmsvc_defer_lock_rqst(rqstp, block);
+		goto out;
+	}
 	if (error) {
 		ret = nlm_lck_denied_nolocks;
 		goto out;

fs/lockd/svcproc.c

@@ -113,6 +113,7 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
+	int rc = rpc_success;
 
 	dprintk("lockd: TEST          called\n");
 	resp->cookie = argp->cookie;
@@ -120,7 +121,7 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Don't accept test requests during grace period */
 	if (nlmsvc_grace_period) {
 		resp->status = nlm_lck_denied_grace_period;
-		return rpc_success;
+		return rc;
 	}
 
 	/* Obtain client and file */
@@ -130,13 +131,14 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Now check for conflicting locks */
 	resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie));
 	if (resp->status == nlm_drop_reply)
-		return rpc_drop_reply;
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: TEST          status %d vers %d\n",
+			ntohl(resp->status), rqstp->rq_vers);
 
-	dprintk("lockd: TEST          status %d vers %d\n",
-		ntohl(resp->status), rqstp->rq_vers);
 	nlm_release_host(host);
 	nlm_release_file(file);
-	return rpc_success;
+	return rc;
 }
 
 static __be32
@@ -145,6 +147,7 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
+	int rc = rpc_success;
 
 	dprintk("lockd: LOCK          called\n");
 
@@ -153,7 +156,7 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 	/* Don't accept new lock requests during grace period */
 	if (nlmsvc_grace_period && !argp->reclaim) {
 		resp->status = nlm_lck_denied_grace_period;
-		return rpc_success;
+		return rc;
 	}
 
 	/* Obtain client and file */
@@ -176,12 +179,13 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 	resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
 					       argp->block, &argp->cookie));
 	if (resp->status == nlm_drop_reply)
-		return rpc_drop_reply;
+		rc = rpc_drop_reply;
+	else
+		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));
 
-	dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
-	return rpc_success;
+	return rc;
 }
 
 static __be32

fs/lockd/svcsubs.c

@@ -87,7 +87,7 @@ nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
 	unsigned int	hash;
 	__be32		nfserr;
 
-	nlm_debug_print_fh("nlm_file_lookup", f);
+	nlm_debug_print_fh("nlm_lookup_file", f);
 
 	hash = file_hash(f);
 

fs/nfs/callback.c

@@ -119,8 +119,8 @@ int nfs_callback_up(void)
 	if (!serv)
 		goto out_err;
 
-	ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport,
-							SVC_SOCK_ANONYMOUS);
+	ret = svc_create_xprt(serv, "tcp", nfs_callback_set_tcpport,
+			      SVC_SOCK_ANONYMOUS);
 	if (ret <= 0)
 		goto out_destroy;
 	nfs_callback_tcpport = ret;

include/linux/nfsd/auth.h → fs/nfsd/auth.h

 /*
- * include/linux/nfsd/auth.h
- *
  * nfsd-specific authentication stuff.
  * uid/gid mapping not yet implemented.
  *
@@ -10,8 +8,6 @@
 #ifndef LINUX_NFSD_AUTH_H
 #define LINUX_NFSD_AUTH_H
 
-#ifdef __KERNEL__
-
 #define nfsd_luid(rq, uid)	((u32)(uid))
 #define nfsd_lgid(rq, gid)	((u32)(gid))
 #define nfsd_ruid(rq, uid)	((u32)(uid))
@@ -23,5 +19,4 @@
  */
 int nfsd_setuser(struct svc_rqst *, struct svc_export *);
 
-#endif /* __KERNEL__ */
 #endif /* LINUX_NFSD_AUTH_H */

fs/nfsd/export.c

@@ -1357,8 +1357,6 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
 	mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
 
 	exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
-	if (PTR_ERR(exp) == -ENOENT)
-		return nfserr_perm;
 	if (IS_ERR(exp))
 		return nfserrno(PTR_ERR(exp));
 	rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
@@ -1637,13 +1635,19 @@ exp_verify_string(char *cp, int max)
 /*
  * Initialize the exports module.
  */
-void
+int
 nfsd_export_init(void)
 {
+	int rv;
 	dprintk("nfsd: initializing export module.\n");
 
-	cache_register(&svc_export_cache);
-	cache_register(&svc_expkey_cache);
+	rv = cache_register(&svc_export_cache);
+	if (rv)
+		return rv;
+	rv = cache_register(&svc_expkey_cache);
+	if (rv)
+		cache_unregister(&svc_export_cache);
+	return rv;
 
 }
 
@@ -1670,10 +1674,8 @@ nfsd_export_shutdown(void)
 
 	exp_writelock();
 
-	if (cache_unregister(&svc_expkey_cache))
-		printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
-	if (cache_unregister(&svc_export_cache))
-		printk(KERN_ERR "nfsd: failed to unregister export cache\n");
+	cache_unregister(&svc_expkey_cache);
+	cache_unregister(&svc_export_cache);
 	svcauth_unix_purge();
 
 	exp_writeunlock();

fs/nfsd/nfs2acl.c

@@ -221,12 +221,17 @@ static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 		struct nfsd3_getaclres *resp)
 {
 	struct dentry *dentry = resp->fh.fh_dentry;
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode;
 	struct kvec *head = rqstp->rq_res.head;
 	unsigned int base;
 	int n;
 	int w;
 
+	/*
+	 * Since this is version 2, the check for nfserr in
+	 * nfsd_dispatch actually ensures the following cannot happen.
+	 * However, it seems fragile to depend on that.
+	 */
 	if (dentry == NULL || dentry->d_inode == NULL)
 		return 0;
 	inode = dentry->d_inode;

fs/nfsd/nfs3xdr.c

@@ -21,6 +21,7 @@
 #include <linux/sunrpc/svc.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/nfsd/xdr3.h>
+#include "auth.h"
 
 #define NFSDDBG_FACILITY		NFSDDBG_XDR
 
@@ -88,10 +89,10 @@ encode_fh(__be32 *p, struct svc_fh *fhp)
  * no slashes or null bytes.
  */
 static __be32 *
-decode_filename(__be32 *p, char **namp, int *lenp)
+decode_filename(__be32 *p, char **namp, unsigned int *lenp)
 {
 	char		*name;
-	int		i;
+	unsigned int	i;
 
 	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
 		for (i = 0, name = *namp; i < *lenp; i++, name++) {
@@ -452,8 +453,7 @@ int
 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 					struct nfsd3_symlinkargs *args)
 {
-	unsigned int len;
-	int avail;
+	unsigned int len, avail;
 	char *old, *new;
 	struct kvec *vec;
 
@@ -486,7 +486,8 @@ nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 	/* now copy next page if there is one */
 	if (len && !avail && rqstp->rq_arg.page_len) {
 		avail = rqstp->rq_arg.page_len;
-		if (avail > PAGE_SIZE) avail = PAGE_SIZE;
+		if (avail > PAGE_SIZE)
+			avail = PAGE_SIZE;
 		old = page_address(rqstp->rq_arg.pages[0]);
 	}
 	while (len && avail && *old) {
@@ -816,11 +817,11 @@ static __be32 *
 encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p,
 		struct svc_fh *fhp)
 {
-		p = encode_post_op_attr(cd->rqstp, p, fhp);
-		*p++ = xdr_one;			/* yes, a file handle follows */
-		p = encode_fh(p, fhp);
-		fh_put(fhp);
-		return p;
+	p = encode_post_op_attr(cd->rqstp, p, fhp);
+	*p++ = xdr_one;			/* yes, a file handle follows */
+	p = encode_fh(p, fhp);
+	fh_put(fhp);
+	return p;
 }
 
 static int

fs/nfsd/nfs4callback.c

@@ -350,30 +350,6 @@ static struct rpc_version *	nfs_cb_version[] = {
 static int do_probe_callback(void *data)
 {
 	struct nfs4_client *clp = data;
-	struct nfs4_callback *cb = &clp->cl_callback;
-	struct rpc_message msg = {
-		.rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
-		.rpc_argp       = clp,
-	};
-	int status;
-
-	status = rpc_call_sync(cb->cb_client, &msg, RPC_TASK_SOFT);
-
-	if (status) {
-		rpc_shutdown_client(cb->cb_client);
-		cb->cb_client = NULL;
-	} else
-		atomic_set(&cb->cb_set, 1);
-	put_nfs4_client(clp);
-	return 0;
-}
-
-/*
- * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
- */
-void
-nfsd4_probe_callback(struct nfs4_client *clp)
-{
 	struct sockaddr_in	addr;
 	struct nfs4_callback    *cb = &clp->cl_callback;
 	struct rpc_timeout	timeparms = {
@@ -390,13 +366,15 @@ nfsd4_probe_callback(struct nfs4_client *clp)
 		.timeout	= &timeparms,
 		.program	= program,
 		.version	= nfs_cb_version[1]->number,
-		.authflavor	= RPC_AUTH_UNIX,	/* XXX: need AUTH_GSS... */
+		.authflavor	= RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */
 		.flags		= (RPC_CLNT_CREATE_NOPING),
 	};
-	struct task_struct *t;
-
-	if (atomic_read(&cb->cb_set))
-		return;
+	struct rpc_message msg = {
+		.rpc_proc       = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
+		.rpc_argp       = clp,
+	};
+	struct rpc_clnt *client;
+	int status;
 
 	/* Initialize address */
 	memset(&addr, 0, sizeof(addr));
@@ -416,29 +394,50 @@ nfsd4_probe_callback(struct nfs4_client *clp)
 	program->stats->program = program;
 
 	/* Create RPC client */
-	cb->cb_client = rpc_create(&args);
-	if (IS_ERR(cb->cb_client)) {
+	client = rpc_create(&args);
+	if (IS_ERR(client)) {
 		dprintk("NFSD: couldn't create callback client\n");
+		status = PTR_ERR(client);
 		goto out_err;
 	}
 
+	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:
+	put_nfs4_client(clp);
+	dprintk("NFSD: warning: no callback path to client %.*s\n",
+		(int)clp->cl_name.len, clp->cl_name.data);
+	return status;
+}
+
+/*
+ * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
+ */
+void
+nfsd4_probe_callback(struct nfs4_client *clp)
+{
+	struct task_struct *t;
+
+	BUG_ON(atomic_read(&clp->cl_callback.cb_set));
+
 	/* 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");
 
 	if (IS_ERR(t))
-		goto out_release_clp;
+		atomic_dec(&clp->cl_count);
 
 	return;
-
-out_release_clp:
-	atomic_dec(&clp->cl_count);
-	rpc_shutdown_client(cb->cb_client);
-out_err:
-	cb->cb_client = NULL;
-	dprintk("NFSD: warning: no callback path to client %.*s\n",
-		(int)clp->cl_name.len, clp->cl_name.data);
 }
 
 /*
@@ -458,9 +457,6 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
 	int retries = 1;
 	int status = 0;
 
-	if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
-		return;
-
 	cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
 	cbr->cbr_dp = dp;
 
@@ -469,6 +465,7 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
 		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
@@ -481,11 +478,10 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
 		status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
 	}
 out_put_cred:
-	if (status == -EIO)
-		atomic_set(&clp->cl_callback.cb_set, 0);
-	/* Success or failure, now we're either waiting for lease expiration
-	 * or deleg_return. */
-	dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
+	/*
+	 * Success or failure, now we're either waiting for lease expiration
+	 * or deleg_return.
+	 */
 	put_nfs4_client(clp);
 	nfs4_put_delegation(dp);
 	return;

fs/nfsd/nfs4idmap.c

@@ -255,13 +255,10 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
 		goto out;
 	if (len == 0)
 		set_bit(CACHE_NEGATIVE, &ent.h.flags);
-	else {
-		if (error >= IDMAP_NAMESZ) {
-			error = -EINVAL;
-			goto out;
-		}
+	else if (len >= IDMAP_NAMESZ)
+		goto out;
+	else
 		memcpy(ent.name, buf1, sizeof(ent.name));
-	}
 	error = -ENOMEM;
 	res = idtoname_update(&ent, res);
 	if (res == NULL)
@@ -467,20 +464,25 @@ nametoid_update(struct ent *new, struct ent *old)
  * Exported API
  */
 
-void
+int
 nfsd_idmap_init(void)
 {
-	cache_register(&idtoname_cache);
-	cache_register(&nametoid_cache);
+	int rv;
+
+	rv = cache_register(&idtoname_cache);
+	if (rv)
+		return rv;
+	rv = cache_register(&nametoid_cache);
+	if (rv)
+		cache_unregister(&idtoname_cache);
+	return rv;
 }
 
 void
 nfsd_idmap_shutdown(void)
 {
-	if (cache_unregister(&idtoname_cache))
-		printk(KERN_ERR "nfsd: failed to unregister idtoname cache\n");
-	if (cache_unregister(&nametoid_cache))
-		printk(KERN_ERR "nfsd: failed to unregister nametoid cache\n");
+	cache_unregister(&idtoname_cache);
+	cache_unregister(&nametoid_cache);
 }
 
 /*

fs/nfsd/nfs4proc.c

@@ -750,7 +750,7 @@ _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 				    cstate->current_fh.fh_export,
 				    cstate->current_fh.fh_dentry, buf,
 				    &count, verify->ve_bmval,
-				    rqstp);
+				    rqstp, 0);
 
 	/* this means that nfsd4_encode_fattr() ran out of space */
 	if (status == nfserr_resource && count == 0)

fs/nfsd/nfs4state.c

@@ -61,7 +61,6 @@ static time_t lease_time = 90;     /* default lease time */
 static time_t user_lease_time = 90;
 static time_t boot_time;
 static int in_grace = 1;
-static u32 current_clientid = 1;
 static u32 current_ownerid = 1;
 static u32 current_fileid = 1;
 static u32 current_delegid = 1;
@@ -340,21 +339,20 @@ STALE_CLIENTID(clientid_t *clid)
  * This type of memory management is somewhat inefficient, but we use it
  * anyway since SETCLIENTID is not a common operation.
  */
-static inline struct nfs4_client *
-alloc_client(struct xdr_netobj name)
+static struct nfs4_client *alloc_client(struct xdr_netobj name)
 {
 	struct nfs4_client *clp;
 
-	if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
-		if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
-			memcpy(clp->cl_name.data, name.data, name.len);
-			clp->cl_name.len = name.len;
-		}
-		else {
-			kfree(clp);
-			clp = NULL;
-		}
+	clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
+	if (clp == NULL)
+		return NULL;
+	clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
+	if (clp->cl_name.data == NULL) {
+		kfree(clp);
+		return NULL;
 	}
+	memcpy(clp->cl_name.data, name.data, name.len);
+	clp->cl_name.len = name.len;
 	return clp;
 }
 
@@ -363,8 +361,11 @@ shutdown_callback_client(struct nfs4_client *clp)
 {
 	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
 
-	/* shutdown rpc client, ending any outstanding recall rpcs */
 	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;
 		rpc_shutdown_client(clnt);
 	}
@@ -422,12 +423,13 @@ expire_client(struct nfs4_client *clp)
 	put_nfs4_client(clp);
 }
 
-static struct nfs4_client *
-create_client(struct xdr_netobj name, char *recdir) {
+static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
+{
 	struct nfs4_client *clp;
 
-	if (!(clp = alloc_client(name)))
-		goto out;
+	clp = alloc_client(name);
+	if (clp == NULL)
+		return NULL;
 	memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
 	atomic_set(&clp->cl_count, 1);
 	atomic_set(&clp->cl_callback.cb_set, 0);
@@ -436,32 +438,30 @@ create_client(struct xdr_netobj name, char *recdir) {
 	INIT_LIST_HEAD(&clp->cl_openowners);
 	INIT_LIST_HEAD(&clp->cl_delegations);
 	INIT_LIST_HEAD(&clp->cl_lru);
-out:
 	return clp;
 }
 
-static void
-copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
-	memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
+static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
+{
+	memcpy(target->cl_verifier.data, source->data,
+			sizeof(target->cl_verifier.data));
 }
 
-static void
-copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
+static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
+{
 	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
 	target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
 }
 
-static void
-copy_cred(struct svc_cred *target, struct svc_cred *source) {
-
+static void copy_cred(struct svc_cred *target, struct svc_cred *source)
+{
 	target->cr_uid = source->cr_uid;
 	target->cr_gid = source->cr_gid;
 	target->cr_group_info = source->cr_group_info;
 	get_group_info(target->cr_group_info);
 }
 
-static inline int
-same_name(const char *n1, const char *n2)
+static int same_name(const char *n1, const char *n2)
 {
 	return 0 == memcmp(n1, n2, HEXDIR_LEN);
 }
@@ -485,26 +485,26 @@ same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
 	return cr1->cr_uid == cr2->cr_uid;
 }
 
-static void
-gen_clid(struct nfs4_client *clp) {
+static void gen_clid(struct nfs4_client *clp)
+{
+	static u32 current_clientid = 1;
+
 	clp->cl_clientid.cl_boot = boot_time;
 	clp->cl_clientid.cl_id = current_clientid++; 
 }
 
-static void
-gen_confirm(struct nfs4_client *clp) {
-	struct timespec 	tv;
-	u32 *			p;
+static void gen_confirm(struct nfs4_client *clp)
+{
+	static u32 i;
+	u32 *p;
 
-	tv = CURRENT_TIME;
 	p = (u32 *)clp->cl_confirm.data;
-	*p++ = tv.tv_sec;
-	*p++ = tv.tv_nsec;
+	*p++ = get_seconds();
+	*p++ = i++;
 }
 
-static int
-check_name(struct xdr_netobj name) {
-
+static int check_name(struct xdr_netobj name)
+{
 	if (name.len == 0) 
 		return 0;
 	if (name.len > NFS4_OPAQUE_LIMIT) {
@@ -683,39 +683,6 @@ out_err:
 	return;
 }
 
-/*
- * RFC 3010 has a complex implmentation description of processing a 
- * SETCLIENTID request consisting of 5 bullets, labeled as 
- * CASE0 - CASE4 below.
- *
- * NOTES:
- * 	callback information will be processed in a future patch
- *
- *	an unconfirmed record is added when:
- *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
- *	CASE 1: confirmed record found with matching name, principal,
- *		verifier, and clientid.
- *	CASE 2: confirmed record found with matching name, principal,
- *		and there is no unconfirmed record with matching
- *		name and principal
- *
- *      an unconfirmed record is replaced when:
- *	CASE 3: confirmed record found with matching name, principal,
- *		and an unconfirmed record is found with matching 
- *		name, principal, and with clientid and
- *		confirm that does not match the confirmed record.
- *	CASE 4: there is no confirmed record with matching name and 
- *		principal. there is an unconfirmed record with 
- *		matching name, principal.
- *
- *	an unconfirmed record is deleted when:
- *	CASE 1: an unconfirmed record that matches input name, verifier,
- *		and confirmed clientid.
- *	CASE 4: any unconfirmed records with matching name and principal
- *		that exist after an unconfirmed record has been replaced
- *		as described above.
- *
- */
 __be32
 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		  struct nfsd4_setclientid *setclid)
@@ -748,11 +715,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	nfs4_lock_state();
 	conf = find_confirmed_client_by_str(dname, strhashval);
 	if (conf) {
-		/* 
-		 * CASE 0:
-		 * clname match, confirmed, different principal
-		 * or different ip_address
-		 */
+		/* RFC 3530 14.2.33 CASE 0: */
 		status = nfserr_clid_inuse;
 		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
 				|| conf->cl_addr != sin->sin_addr.s_addr) {
@@ -761,12 +724,17 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			goto out;
 		}
 	}
+	/*
+	 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
+	 * has a description of SETCLIENTID request processing consisting
+	 * of 5 bullet points, labeled as CASE0 - CASE4 below.
+	 */
 	unconf = find_unconfirmed_client_by_str(dname, strhashval);
 	status = nfserr_resource;
 	if (!conf) {
-		/* 
-		 * CASE 4:
-		 * placed first, because it is the normal case.
+		/*
+		 * RFC 3530 14.2.33 CASE 4:
+		 * placed first, because it is the normal case
 		 */
 		if (unconf)
 			expire_client(unconf);
@@ -776,17 +744,8 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		gen_clid(new);
 	} else if (same_verf(&conf->cl_verifier, &clverifier)) {
 		/*
-		 * CASE 1:
-		 * cl_name match, confirmed, principal match
-		 * verifier match: probable callback update
-		 *
-		 * remove any unconfirmed nfs4_client with 
-		 * matching cl_name, cl_verifier, and cl_clientid
-		 *
-		 * create and insert an unconfirmed nfs4_client with same 
-		 * cl_name, cl_verifier, and cl_clientid as existing 
-		 * nfs4_client,  but with the new callback info and a 
-		 * new cl_confirm
+		 * RFC 3530 14.2.33 CASE 1:
+		 * probable callback update
 		 */
 		if (unconf) {
 			/* Note this is removing unconfirmed {*x***},
@@ -802,43 +761,25 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		copy_clid(new, conf);
 	} else if (!unconf) {
 		/*
-		 * CASE 2:
-		 * clname match, confirmed, principal match
-		 * verfier does not match
-		 * no unconfirmed. create a new unconfirmed nfs4_client
-		 * using input clverifier, clname, and callback info
-		 * and generate a new cl_clientid and cl_confirm.
+		 * RFC 3530 14.2.33 CASE 2:
+		 * probable client reboot; state will be removed if
+		 * confirmed.
 		 */
 		new = create_client(clname, dname);
 		if (new == NULL)
 			goto out;
 		gen_clid(new);
-	} else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
-		/*	
-		 * CASE3:
-		 * confirmed found (name, principal match)
-		 * confirmed verifier does not match input clverifier
-		 *
-		 * unconfirmed found (name match)
-		 * confirmed->cl_confirm != unconfirmed->cl_confirm
-		 *
-		 * remove unconfirmed.
-		 *
-		 * create an unconfirmed nfs4_client 
-		 * with same cl_name as existing confirmed nfs4_client, 
-		 * but with new callback info, new cl_clientid,
-		 * new cl_verifier and a new cl_confirm
+	} else {
+		/*
+		 * RFC 3530 14.2.33 CASE 3:
+		 * probable client reboot; state will be removed if
+		 * confirmed.
 		 */
 		expire_client(unconf);
 		new = create_client(clname, dname);
 		if (new == NULL)
 			goto out;
 		gen_clid(new);
-	} else {
-		/* No cases hit !!! */
-		status = nfserr_inval;
-		goto out;
-
 	}
 	copy_verf(new, &clverifier);
 	new->cl_addr = sin->sin_addr.s_addr;
@@ -857,11 +798,9 @@ out:
 
 
 /*
- * RFC 3010 has a complex implmentation description of processing a 
- * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
- * processing on a DRC miss, labeled as CASE1 - CASE4 below.
- *
- * NOTE: callback information will be processed here in a future patch
+ * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
+ * a description of SETCLIENTID_CONFIRM request processing consisting of 4
+ * bullets, labeled as CASE1 - CASE4 below.
  */
 __be32
 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
@@ -892,16 +831,16 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 	if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
 		goto out;
 
-	if ((conf && unconf) && 
-	    (same_verf(&unconf->cl_confirm, &confirm)) &&
-	    (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
-	    (same_name(conf->cl_recdir,unconf->cl_recdir))  &&
-	    (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
-		/* CASE 1:
-		* unconf record that matches input clientid and input confirm.
-		* conf record that matches input clientid.
-		* conf and unconf records match names, verifiers
-		*/
+	/*
+	 * section 14.2.34 of RFC 3530 has a description of
+	 * SETCLIENTID_CONFIRM request processing consisting
+	 * of 4 bullet points, labeled as CASE1 - CASE4 below.
+	 */
+	if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
+		/*
+		 * RFC 3530 14.2.34 CASE 1:
+		 * callback update
+		 */
 		if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
 			status = nfserr_clid_inuse;
 		else {
@@ -914,15 +853,11 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 			status = nfs_ok;
 
 		}
-	} else if ((conf && !unconf) ||
-	    ((conf && unconf) && 
-	     (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
-	      !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
-		/* CASE 2:
-		 * conf record that matches input clientid.
-		 * if unconf record matches input clientid, then
-		 * unconf->cl_name or unconf->cl_verifier don't match the
-		 * conf record.
+	} else if (conf && !unconf) {
+		/*
+		 * RFC 3530 14.2.34 CASE 2:
+		 * probable retransmitted request; play it safe and
+		 * do nothing.
 		 */
 		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
 			status = nfserr_clid_inuse;
@@ -930,10 +865,9 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 			status = nfs_ok;
 	} else if (!conf && unconf
 			&& same_verf(&unconf->cl_confirm, &confirm)) {
-		/* CASE 3:
-		 * conf record not found.
-		 * unconf record found.
-		 * unconf->cl_confirm matches input confirm
+		/*
+		 * RFC 3530 14.2.34 CASE 3:
+		 * Normal case; new or rebooted client:
 		 */
 		if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
 			status = nfserr_clid_inuse;
@@ -948,16 +882,15 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 			}
 			move_to_confirmed(unconf);
 			conf = unconf;
+			nfsd4_probe_callback(conf);
 			status = nfs_ok;
 		}
 	} else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
 	    && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
 				    				&confirm)))) {
-		/* CASE 4:
-		 * conf record not found, or if conf, conf->cl_confirm does not
-		 * match input confirm.
-		 * unconf record not found, or if unconf, unconf->cl_confirm
-		 * does not match input confirm.
+		/*
+		 * RFC 3530 14.2.34 CASE 4:
+		 * Client probably hasn't noticed that we rebooted yet.
 		 */
 		status = nfserr_stale_clientid;
 	} else {
@@ -965,8 +898,6 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 		status = nfserr_clid_inuse;
 	}
 out:
-	if (!status)
-		nfsd4_probe_callback(conf);
 	nfs4_unlock_state();
 	return status;
 }
@@ -1226,14 +1157,19 @@ find_file(struct inode *ino)
 	return NULL;
 }
 
-static int access_valid(u32 x)
+static inline int access_valid(u32 x)
 {
-	return (x > 0 && x < 4);
+	if (x < NFS4_SHARE_ACCESS_READ)
+		return 0;
+	if (x > NFS4_SHARE_ACCESS_BOTH)
+		return 0;
+	return 1;
 }
 
-static int deny_valid(u32 x)
+static inline int deny_valid(u32 x)
 {
-	return (x >= 0 && x < 5);
+	/* Note: unlike access bits, deny bits may be zero. */
+	return x <= NFS4_SHARE_DENY_BOTH;
 }
 
 static void
@@ -2162,8 +2098,10 @@ nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *statei
 		goto check_replay;
 	}
 
+	*stpp = stp;
+	*sopp = sop = stp->st_stateowner;
+
 	if (lock) {
-		struct nfs4_stateowner *sop = stp->st_stateowner;
 		clientid_t *lockclid = &lock->v.new.clientid;
 		struct nfs4_client *clp = sop->so_client;
 		int lkflg = 0;
@@ -2193,9 +2131,6 @@ nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *statei
 		return nfserr_bad_stateid;
 	}
 
-	*stpp = stp;
-	*sopp = sop = stp->st_stateowner;
-
 	/*
 	*  We now validate the seqid and stateid generation numbers.
 	*  For the moment, we ignore the possibility of 

fs/nfsd/nfs4xdr.c

@@ -148,12 +148,12 @@ xdr_error:					\
 	}					\
 } while (0)
 
-static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
+static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 {
 	/* We want more bytes than seem to be available.
 	 * Maybe we need a new page, maybe we have just run out
 	 */
-	int avail = (char*)argp->end - (char*)argp->p;
+	unsigned int avail = (char *)argp->end - (char *)argp->p;
 	__be32 *p;
 	if (avail + argp->pagelen < nbytes)
 		return NULL;
@@ -169,6 +169,11 @@ static __be32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
 			return NULL;
 		
 	}
+	/*
+	 * The following memcpy is safe because read_buf is always
+	 * called with nbytes > avail, and the two cases above both
+	 * guarantee p points to at least nbytes bytes.
+	 */
 	memcpy(p, argp->p, avail);
 	/* step to next page */
 	argp->p = page_address(argp->pagelist[0]);
@@ -1448,7 +1453,7 @@ static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
 __be32
 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
 		struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
-		struct svc_rqst *rqstp)
+		struct svc_rqst *rqstp, int ignore_crossmnt)
 {
 	u32 bmval0 = bmval[0];
 	u32 bmval1 = bmval[1];
@@ -1828,7 +1833,12 @@ out_acl:
 	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
 		if ((buflen -= 8) < 0)
                 	goto out_resource;
-		if (exp->ex_mnt->mnt_root->d_inode == dentry->d_inode) {
+		/*
+		 * Get parent's attributes if not ignoring crossmount
+		 * and this is the root of a cross-mounted filesystem.
+		 */
+		if (ignore_crossmnt == 0 &&
+		    exp->ex_mnt->mnt_root->d_inode == dentry->d_inode) {
 			err = vfs_getattr(exp->ex_mnt->mnt_parent,
 				exp->ex_mnt->mnt_mountpoint, &stat);
 			if (err)
@@ -1864,13 +1874,25 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
 	struct svc_export *exp = cd->rd_fhp->fh_export;
 	struct dentry *dentry;
 	__be32 nfserr;
+	int ignore_crossmnt = 0;
 
 	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
 	if (IS_ERR(dentry))
 		return nfserrno(PTR_ERR(dentry));
 
 	exp_get(exp);
-	if (d_mountpoint(dentry)) {
+	/*
+	 * In the case of a mountpoint, the client may be asking for
+	 * attributes that are only properties of the underlying filesystem
+	 * as opposed to the cross-mounted file system. In such a case,
+	 * we will not follow the cross mount and will fill the attribtutes
+	 * directly from the mountpoint dentry.
+	 */
+	if (d_mountpoint(dentry) &&
+	    (cd->rd_bmval[0] & ~FATTR4_WORD0_RDATTR_ERROR) == 0 &&
+	    (cd->rd_bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) == 0)
+		ignore_crossmnt = 1;
+	else if (d_mountpoint(dentry)) {
 		int err;
 
 		/*
@@ -1889,7 +1911,7 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
 
 	}
 	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
-					cd->rd_rqstp);
+					cd->rd_rqstp, ignore_crossmnt);
 out_put:
 	dput(dentry);
 	exp_put(exp);
@@ -2043,7 +2065,7 @@ nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
 	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
 	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
 				    resp->p, &buflen, getattr->ga_bmval,
-				    resp->rqstp);
+				    resp->rqstp, 0);
 	if (!nfserr)
 		resp->p += buflen;
 	return nfserr;

fs/nfsd/nfscache.c

@@ -44,17 +44,17 @@ static int	nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *vec);
  */
 static DEFINE_SPINLOCK(cache_lock);
 
-void
-nfsd_cache_init(void)
+int nfsd_reply_cache_init(void)
 {
 	struct svc_cacherep	*rp;
 	int			i;
 
 	INIT_LIST_HEAD(&lru_head);
 	i = CACHESIZE;
-	while(i) {
+	while (i) {
 		rp = kmalloc(sizeof(*rp), GFP_KERNEL);
-		if (!rp) break;
+		if (!rp)
+			goto out_nomem;
 		list_add(&rp->c_lru, &lru_head);
 		rp->c_state = RC_UNUSED;
 		rp->c_type = RC_NOCACHE;
@@ -62,23 +62,19 @@ nfsd_cache_init(void)
 		i--;
 	}
 
-	if (i)
-		printk (KERN_ERR "nfsd: cannot allocate all %d cache entries, only got %d\n",
-			CACHESIZE, CACHESIZE-i);
-
 	hash_list = kcalloc (HASHSIZE, sizeof(struct hlist_head), GFP_KERNEL);
-	if (!hash_list) {
-		nfsd_cache_shutdown();
-		printk (KERN_ERR "nfsd: cannot allocate %Zd bytes for hash list\n",
-			HASHSIZE * sizeof(struct hlist_head));
-		return;
-	}
+	if (!hash_list)
+		goto out_nomem;
 
 	cache_disabled = 0;
+	return 0;
+out_nomem:
+	printk(KERN_ERR "nfsd: failed to allocate reply cache\n");
+	nfsd_reply_cache_shutdown();
+	return -ENOMEM;
 }
 
-void
-nfsd_cache_shutdown(void)
+void nfsd_reply_cache_shutdown(void)
 {
 	struct svc_cacherep	*rp;
 

fs/nfsd/nfsctl.c

@@ -304,6 +304,9 @@ static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 	struct auth_domain *dom;
 	struct knfsd_fh fh;
 
+	if (size == 0)
+		return -EINVAL;
+
 	if (buf[size-1] != '\n')
 		return -EINVAL;
 	buf[size-1] = 0;
@@ -503,7 +506,7 @@ static ssize_t write_ports(struct file *file, char *buf, size_t size)
 		int len = 0;
 		lock_kernel();
 		if (nfsd_serv)
-			len = svc_sock_names(buf, nfsd_serv, NULL);
+			len = svc_xprt_names(nfsd_serv, buf, 0);
 		unlock_kernel();
 		return len;
 	}
@@ -540,7 +543,7 @@ static ssize_t write_ports(struct file *file, char *buf, size_t size)
 		}
 		return err < 0 ? err : 0;
 	}
-	if (buf[0] == '-') {
+	if (buf[0] == '-' && isdigit(buf[1])) {
 		char *toclose = kstrdup(buf+1, GFP_KERNEL);
 		int len = 0;
 		if (!toclose)
@@ -554,6 +557,53 @@ static ssize_t write_ports(struct file *file, char *buf, size_t size)
 		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) {
+			err = nfsd_create_serv();
+			if (!err) {
+				err = svc_create_xprt(nfsd_serv,
+						      transport, 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 == 0)
+				return -EINVAL;
+			lock_kernel();
+			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;
+			}
+			unlock_kernel();
+			return err < 0 ? err : 0;
+		}
+	}
 	return -EINVAL;
 }
 
@@ -616,7 +666,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 	char *recdir;
 	int len, status;
 
-	if (size > PATH_MAX || buf[size-1] != '\n')
+	if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
 		return -EINVAL;
 	buf[size-1] = 0;
 
@@ -674,6 +724,27 @@ static struct file_system_type nfsd_fs_type = {
 	.kill_sb	= kill_litter_super,
 };
 
+#ifdef CONFIG_PROC_FS
+static int create_proc_exports_entry(void)
+{
+	struct proc_dir_entry *entry;
+
+	entry = proc_mkdir("fs/nfs", NULL);
+	if (!entry)
+		return -ENOMEM;
+	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
+	if (!entry)
+		return -ENOMEM;
+	entry->proc_fops =  &exports_operations;
+	return 0;
+}
+#else /* CONFIG_PROC_FS */
+static int create_proc_exports_entry(void)
+{
+	return 0;
+}
+#endif
+
 static int __init init_nfsd(void)
 {
 	int retval;
@@ -683,32 +754,43 @@ static int __init init_nfsd(void)
 	if (retval)
 		return retval;
 	nfsd_stat_init();	/* Statistics */
-	nfsd_cache_init();	/* RPC reply cache */
-	nfsd_export_init();	/* Exports table */
+	retval = nfsd_reply_cache_init();
+	if (retval)
+		goto out_free_stat;
+	retval = nfsd_export_init();
+	if (retval)
+		goto out_free_cache;
 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
-	nfsd_idmap_init();      /* Name to ID mapping */
-	if (proc_mkdir("fs/nfs", NULL)) {
-		struct proc_dir_entry *entry;
-		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
-		if (entry)
-			entry->proc_fops =  &exports_operations;
-	}
+	retval = nfsd_idmap_init();
+	if (retval)
+		goto out_free_lockd;
+	retval = create_proc_exports_entry();
+	if (retval)
+		goto out_free_idmap;
 	retval = register_filesystem(&nfsd_fs_type);
-	if (retval) {
-		nfsd_export_shutdown();
-		nfsd_cache_shutdown();
-		remove_proc_entry("fs/nfs/exports", NULL);
-		remove_proc_entry("fs/nfs", NULL);
-		nfsd_stat_shutdown();
-		nfsd_lockd_shutdown();
-	}
+	if (retval)
+		goto out_free_all;
+	return 0;
+out_free_all:
+	remove_proc_entry("fs/nfs/exports", NULL);
+	remove_proc_entry("fs/nfs", NULL);
+out_free_idmap:
+	nfsd_idmap_shutdown();
+out_free_lockd:
+	nfsd_lockd_shutdown();
+	nfsd_export_shutdown();
+out_free_cache:
+	nfsd_reply_cache_shutdown();
+out_free_stat:
+	nfsd_stat_shutdown();
+	nfsd4_free_slabs();
 	return retval;
 }
 
 static void __exit exit_nfsd(void)
 {
 	nfsd_export_shutdown();
-	nfsd_cache_shutdown();
+	nfsd_reply_cache_shutdown();
 	remove_proc_entry("fs/nfs/exports", NULL);
 	remove_proc_entry("fs/nfs", NULL);
 	nfsd_stat_shutdown();