From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 28 Apr 2011 20:13:07 +0000 (-0700)
Subject: Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
X-Git-Tag: v2.6.39-rc6~24
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=9cab1ba421fbc4c4503ccf4ff61e000c771e8942;hp=cc03638df20acbec5d0d0d9e07234aadde9e698d

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

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  nfs: don't lose MS_SYNCHRONOUS on remount of noac mount
  NFS: Return meaningful status from decode_secinfo()
  NFSv4: Ensure we request the ordinary fileid when doing readdirplus
  NFSv4: Ensure that clientid and session establishment can time out
  SUNRPC: Allow RPC calls to return ETIMEDOUT instead of EIO
  NFSv4.1: Don't loop forever in nfs4_proc_create_session
  NFSv4: Handle NFS4ERR_WRONGSEC outside of nfs4_handle_exception()
  NFSv4.1: Don't update sequence number if rpc_task is not sent
  NFSv4.1: Ensure state manager thread dies on last umount
  SUNRPC: Fix the SUNRPC Kerberos V RPCSEC_GSS module dependencies
  NFS: Use correct variable for page bounds checking
  NFS: don't negotiate when user specifies sec flavor
  NFS: Attempt mount with default sec flavor first
  NFS: flav_array honors NFS_MAX_SECFLAVORS
  NFS: Fix infinite loop in gss_create_upcall()
  Don't mark_inode_dirty_sync() while holding lock
  NFS: Get rid of pointless test in nfs_commit_done
  NFS: Remove unused argument from nfs_find_best_sec()
  NFS: Eliminate duplicate call to nfs_mark_request_dirty
  NFS: Remove dead code from nfs_fs_mount()
---

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 89fc160fd5b0..1f063bacd285 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -119,7 +119,7 @@ Elong:
 }
 
 #ifdef CONFIG_NFS_V4
-static rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *flavors, struct inode *inode)
+static rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *flavors)
 {
 	struct gss_api_mech *mech;
 	struct xdr_netobj oid;
@@ -166,7 +166,7 @@ static int nfs_negotiate_security(const struct dentry *parent,
 		}
 		flavors = page_address(page);
 		ret = secinfo(parent->d_inode, &dentry->d_name, flavors);
-		*flavor = nfs_find_best_sec(flavors, dentry->d_inode);
+		*flavor = nfs_find_best_sec(flavors);
 		put_page(page);
 	}
 
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index e1c261ddd65d..c4a69833dd0d 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -47,6 +47,7 @@ enum nfs4_client_state {
 	NFS4CLNT_LAYOUTRECALL,
 	NFS4CLNT_SESSION_RESET,
 	NFS4CLNT_RECALL_SLOT,
+	NFS4CLNT_LEASE_CONFIRM,
 };
 
 enum nfs4_session_state {
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 9bf41eab3e46..69c0f3c5ee7a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -46,6 +46,7 @@
 #include <linux/nfs4.h>
 #include <linux/nfs_fs.h>
 #include <linux/nfs_page.h>
+#include <linux/nfs_mount.h>
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/module.h>
@@ -443,8 +444,8 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
 	if (res->sr_status == 1)
 		res->sr_status = NFS_OK;
 
-	/* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
-	if (!res->sr_slot)
+	/* don't increment the sequence number if the task wasn't sent */
+	if (!RPC_WAS_SENT(task))
 		goto out;
 
 	/* Check the SEQUENCE operation status */
@@ -2185,9 +2186,14 @@ static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
 	struct nfs4_exception exception = { };
 	int err;
 	do {
-		err = nfs4_handle_exception(server,
-				_nfs4_lookup_root(server, fhandle, info),
-				&exception);
+		err = _nfs4_lookup_root(server, fhandle, info);
+		switch (err) {
+		case 0:
+		case -NFS4ERR_WRONGSEC:
+			break;
+		default:
+			err = nfs4_handle_exception(server, err, &exception);
+		}
 	} while (exception.retry);
 	return err;
 }
@@ -2208,25 +2214,47 @@ out:
 	return ret;
 }
 
-/*
- * get the file handle for the "/" directory on the server
- */
-static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
 			      struct nfs_fsinfo *info)
 {
 	int i, len, status = 0;
-	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS + 2];
+	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
 
-	flav_array[0] = RPC_AUTH_UNIX;
-	len = gss_mech_list_pseudoflavors(&flav_array[1]);
-	flav_array[1+len] = RPC_AUTH_NULL;
-	len += 2;
+	len = gss_mech_list_pseudoflavors(&flav_array[0]);
+	flav_array[len] = RPC_AUTH_NULL;
+	len += 1;
 
 	for (i = 0; i < len; i++) {
 		status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
-		if (status != -EPERM)
-			break;
+		if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
+			continue;
+		break;
 	}
+	/*
+	 * -EACCESS could mean that the user doesn't have correct permissions
+	 * to access the mount.  It could also mean that we tried to mount
+	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
+	 * existing mount programs don't handle -EACCES very well so it should
+	 * be mapped to -EPERM instead.
+	 */
+	if (status == -EACCES)
+		status = -EPERM;
+	return status;
+}
+
+/*
+ * get the file handle for the "/" directory on the server
+ */
+static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+			      struct nfs_fsinfo *info)
+{
+	int status = nfs4_lookup_root(server, fhandle, info);
+	if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
+		/*
+		 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
+		 * by nfs4_map_errors() as this function exits.
+		 */
+		status = nfs4_find_root_sec(server, fhandle, info);
 	if (status == 0)
 		status = nfs4_server_capabilities(server, fhandle);
 	if (status == 0)
@@ -3723,21 +3751,20 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
 				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
 				clp->cl_ipaddr, port >> 8, port & 255);
 
-		status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+		status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 		if (status != -NFS4ERR_CLID_INUSE)
 			break;
-		if (signalled())
+		if (loop != 0) {
+			++clp->cl_id_uniquifier;
 			break;
-		if (loop++ & 1)
-			ssleep(clp->cl_lease_time / HZ + 1);
-		else
-			if (++clp->cl_id_uniquifier == 0)
-				break;
+		}
+		++loop;
+		ssleep(clp->cl_lease_time / HZ + 1);
 	}
 	return status;
 }
 
-static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
+int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
 		struct nfs4_setclientid_res *arg,
 		struct rpc_cred *cred)
 {
@@ -3752,7 +3779,7 @@ static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
 	int status;
 
 	now = jiffies;
-	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	if (status == 0) {
 		spin_lock(&clp->cl_lock);
 		clp->cl_lease_time = fsinfo.lease_time * HZ;
@@ -3762,26 +3789,6 @@ static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
 	return status;
 }
 
-int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
-		struct nfs4_setclientid_res *arg,
-		struct rpc_cred *cred)
-{
-	long timeout = 0;
-	int err;
-	do {
-		err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
-		switch (err) {
-			case 0:
-				return err;
-			case -NFS4ERR_RESOURCE:
-				/* The IBM lawyers misread another document! */
-			case -NFS4ERR_DELAY:
-				err = nfs4_delay(clp->cl_rpcclient, &timeout);
-		}
-	} while (err == 0);
-	return err;
-}
-
 struct nfs4_delegreturndata {
 	struct nfs4_delegreturnargs args;
 	struct nfs4_delegreturnres res;
@@ -4786,7 +4793,7 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
 				init_utsname()->domainname,
 				clp->cl_rpcclient->cl_auth->au_flavor);
 
-	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	if (!status)
 		status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
 	dprintk("<-- %s status= %d\n", __func__, status);
@@ -4869,7 +4876,8 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
 		.rpc_client = clp->cl_rpcclient,
 		.rpc_message = &msg,
 		.callback_ops = &nfs4_get_lease_time_ops,
-		.callback_data = &data
+		.callback_data = &data,
+		.flags = RPC_TASK_TIMEOUT,
 	};
 	int status;
 
@@ -5171,7 +5179,7 @@ static int _nfs4_proc_create_session(struct nfs_client *clp)
 	nfs4_init_channel_attrs(&args);
 	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
 
-	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 
 	if (!status)
 		/* Verify the session's negotiated channel_attrs values */
@@ -5194,20 +5202,10 @@ int nfs4_proc_create_session(struct nfs_client *clp)
 	int status;
 	unsigned *ptr;
 	struct nfs4_session *session = clp->cl_session;
-	long timeout = 0;
-	int err;
 
 	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
 
-	do {
-		status = _nfs4_proc_create_session(clp);
-		if (status == -NFS4ERR_DELAY) {
-			err = nfs4_delay(clp->cl_rpcclient, &timeout);
-			if (err)
-				status = err;
-		}
-	} while (status == -NFS4ERR_DELAY);
-
+	status = _nfs4_proc_create_session(clp);
 	if (status)
 		goto out;
 
@@ -5248,7 +5246,7 @@ int nfs4_proc_destroy_session(struct nfs4_session *session)
 	msg.rpc_argp = session;
 	msg.rpc_resp = NULL;
 	msg.rpc_cred = NULL;
-	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 
 	if (status)
 		printk(KERN_WARNING
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index a6804f704d9d..036f5adc9e1f 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -64,10 +64,15 @@ static LIST_HEAD(nfs4_clientid_list);
 
 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 {
-	struct nfs4_setclientid_res clid;
+	struct nfs4_setclientid_res clid = {
+		.clientid = clp->cl_clientid,
+		.confirm = clp->cl_confirm,
+	};
 	unsigned short port;
 	int status;
 
+	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
+		goto do_confirm;
 	port = nfs_callback_tcpport;
 	if (clp->cl_addr.ss_family == AF_INET6)
 		port = nfs_callback_tcpport6;
@@ -75,10 +80,14 @@ int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
 	if (status != 0)
 		goto out;
+	clp->cl_clientid = clid.clientid;
+	clp->cl_confirm = clid.confirm;
+	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
+do_confirm:
 	status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
 	if (status != 0)
 		goto out;
-	clp->cl_clientid = clid.clientid;
+	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 	nfs4_schedule_state_renewal(clp);
 out:
 	return status;
@@ -230,13 +239,18 @@ int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 {
 	int status;
 
+	if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
+		goto do_confirm;
 	nfs4_begin_drain_session(clp);
 	status = nfs4_proc_exchange_id(clp, cred);
 	if (status != 0)
 		goto out;
+	set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
+do_confirm:
 	status = nfs4_proc_create_session(clp);
 	if (status != 0)
 		goto out;
+	clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 	nfs41_setup_state_renewal(clp);
 	nfs_mark_client_ready(clp, NFS_CS_READY);
 out:
@@ -1584,20 +1598,23 @@ static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
  */
 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
 {
-	if (nfs4_has_session(clp)) {
-		switch (status) {
-		case -NFS4ERR_DELAY:
-		case -NFS4ERR_CLID_INUSE:
-		case -EAGAIN:
-			break;
+	switch (status) {
+	case -NFS4ERR_CLID_INUSE:
+	case -NFS4ERR_STALE_CLIENTID:
+		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
+		break;
+	case -NFS4ERR_DELAY:
+	case -ETIMEDOUT:
+	case -EAGAIN:
+		ssleep(1);
+		break;
 
-		case -EKEYEXPIRED:
-			nfs4_warn_keyexpired(clp->cl_hostname);
-		case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
-					 * in nfs4_exchange_id */
-		default:
-			return;
-		}
+	case -EKEYEXPIRED:
+		nfs4_warn_keyexpired(clp->cl_hostname);
+	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
+				 * in nfs4_exchange_id */
+	default:
+		return;
 	}
 	set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
 }
@@ -1607,7 +1624,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
 	int status = 0;
 
 	/* Ensure exclusive access to NFSv4 state */
-	for(;;) {
+	do {
 		if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
 			/* We're going to have to re-establish a clientid */
 			status = nfs4_reclaim_lease(clp);
@@ -1691,7 +1708,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
 			break;
 		if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
 			break;
-	}
+	} while (atomic_read(&clp->cl_count) > 1);
 	return;
 out_error:
 	printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index dddfb5795d7b..c3ccd2c46834 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1452,26 +1452,25 @@ static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args,
 
 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
 {
-	uint32_t attrs[2] = {0, 0};
+	uint32_t attrs[2] = {
+		FATTR4_WORD0_RDATTR_ERROR,
+		FATTR4_WORD1_MOUNTED_ON_FILEID,
+	};
 	uint32_t dircount = readdir->count >> 1;
 	__be32 *p;
 
 	if (readdir->plus) {
 		attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
-			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE;
+			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
 		attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
 			FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
 			FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
 			FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
 		dircount >>= 1;
 	}
-	attrs[0] |= FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID;
-	attrs[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
-	/* Switch to mounted_on_fileid if the server supports it */
-	if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
-		attrs[0] &= ~FATTR4_WORD0_FILEID;
-	else
-		attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
+	/* Use mounted_on_fileid only if the server supports it */
+	if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
+		attrs[0] |= FATTR4_WORD0_FILEID;
 
 	p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
 	*p++ = cpu_to_be32(OP_READDIR);
@@ -3140,7 +3139,7 @@ static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitma
 			goto out_overflow;
 		xdr_decode_hyper(p, fileid);
 		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
-		ret = NFS_ATTR_FATTR_FILEID;
+		ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
 	}
 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
 	return ret;
@@ -4002,7 +4001,6 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
 {
 	int status;
 	umode_t fmode = 0;
-	uint64_t fileid;
 	uint32_t type;
 
 	status = decode_attr_type(xdr, bitmap, &type);
@@ -4101,13 +4099,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
 		goto xdr_error;
 	fattr->valid |= status;
 
-	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid);
+	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
 	if (status < 0)
 		goto xdr_error;
-	if (status != 0 && !(fattr->valid & status)) {
-		fattr->fileid = fileid;
-		fattr->valid |= status;
-	}
+	fattr->valid |= status;
 
 xdr_error:
 	dprintk("%s: xdr returned %d\n", __func__, -status);
@@ -4838,17 +4833,21 @@ static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
 	struct nfs4_secinfo_flavor *sec_flavor;
 	int status;
 	__be32 *p;
-	int i;
+	int i, num_flavors;
 
 	status = decode_op_hdr(xdr, OP_SECINFO);
+	if (status)
+		goto out;
 	p = xdr_inline_decode(xdr, 4);
 	if (unlikely(!p))
 		goto out_overflow;
-	res->flavors->num_flavors = be32_to_cpup(p);
 
-	for (i = 0; i < res->flavors->num_flavors; i++) {
+	res->flavors->num_flavors = 0;
+	num_flavors = be32_to_cpup(p);
+
+	for (i = 0; i < num_flavors; i++) {
 		sec_flavor = &res->flavors->flavors[i];
-		if ((char *)&sec_flavor[1] - (char *)res > PAGE_SIZE)
+		if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
 			break;
 
 		p = xdr_inline_decode(xdr, 4);
@@ -4857,13 +4856,15 @@ static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
 		sec_flavor->flavor = be32_to_cpup(p);
 
 		if (sec_flavor->flavor == RPC_AUTH_GSS) {
-			if (decode_secinfo_gss(xdr, sec_flavor))
-				break;
+			status = decode_secinfo_gss(xdr, sec_flavor);
+			if (status)
+				goto out;
 		}
+		res->flavors->num_flavors++;
 	}
 
-	return 0;
-
+out:
+	return status;
 out_overflow:
 	print_overflow_msg(__func__, xdr);
 	return -EIO;
@@ -6408,7 +6409,9 @@ int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
 	if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
 					entry->server, 1) < 0)
 		goto out_overflow;
-	if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
+	if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
+		entry->ino = entry->fattr->mounted_on_fileid;
+	else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
 		entry->ino = entry->fattr->fileid;
 
 	entry->d_type = DT_UNKNOWN;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d9ab97269ce6..ff681ab65d31 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1004,6 +1004,7 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata)
 {
 	struct nfs_inode *nfsi = NFS_I(wdata->inode);
 	loff_t end_pos = wdata->args.offset + wdata->res.count;
+	bool mark_as_dirty = false;
 
 	spin_lock(&nfsi->vfs_inode.i_lock);
 	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
@@ -1011,13 +1012,18 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata)
 		get_lseg(wdata->lseg);
 		wdata->lseg->pls_lc_cred =
 			get_rpccred(wdata->args.context->state->owner->so_cred);
-		mark_inode_dirty_sync(wdata->inode);
+		mark_as_dirty = true;
 		dprintk("%s: Set layoutcommit for inode %lu ",
 			__func__, wdata->inode->i_ino);
 	}
 	if (end_pos > wdata->lseg->pls_end_pos)
 		wdata->lseg->pls_end_pos = end_pos;
 	spin_unlock(&nfsi->vfs_inode.i_lock);
+
+	/* if pnfs_layoutcommit_inode() runs between inode locks, the next one
+	 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
+	if (mark_as_dirty)
+		mark_inode_dirty_sync(wdata->inode);
 }
 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
 
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2b8e9a5e366a..e288f06d3fa7 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1004,6 +1004,7 @@ static int nfs_parse_security_flavors(char *value,
 		return 0;
 	}
 
+	mnt->flags |= NFS_MOUNT_SECFLAVOUR;
 	mnt->auth_flavor_len = 1;
 	return 1;
 }
@@ -1976,6 +1977,15 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data)
 	if (error < 0)
 		goto out;
 
+	/*
+	 * noac is a special case. It implies -o sync, but that's not
+	 * necessarily reflected in the mtab options. do_remount_sb
+	 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
+	 * remount options, so we have to explicitly reset it.
+	 */
+	if (data->flags & NFS_MOUNT_NOAC)
+		*flags |= MS_SYNCHRONOUS;
+
 	/* compare new mount options with old ones */
 	error = nfs_compare_remount_data(nfss, data);
 out:
@@ -2235,8 +2245,7 @@ static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
 	if (!s->s_root) {
 		/* initial superblock/root creation */
 		nfs_fill_super(s, data);
-		nfs_fscache_get_super_cookie(
-			s, data ? data->fscache_uniq : NULL, NULL);
+		nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
 	}
 
 	mntroot = nfs_get_root(s, mntfh, dev_name);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index e4cbc11a74ab..3bd5d7e80f6c 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -680,7 +680,6 @@ static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
 	req = nfs_setup_write_request(ctx, page, offset, count);
 	if (IS_ERR(req))
 		return PTR_ERR(req);
-	nfs_mark_request_dirty(req);
 	/* Update file length */
 	nfs_grow_file(page, offset, count);
 	nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
@@ -1418,8 +1417,7 @@ static void nfs_commit_done(struct rpc_task *task, void *calldata)
                                 task->tk_pid, task->tk_status);
 
 	/* Call the NFS version-specific code */
-	if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
-		return;
+	NFS_PROTO(data->inode)->commit_done(task, data);
 }
 
 void nfs_commit_release_pages(struct nfs_write_data *data)
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 216cea5db0aa..87694ca86914 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -47,6 +47,7 @@ struct nfs_client {
 
 #ifdef CONFIG_NFS_V4
 	u64			cl_clientid;	/* constant */
+	nfs4_verifier		cl_confirm;	/* Clientid verifier */
 	unsigned long		cl_state;
 
 	spinlock_t		cl_lock;
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 78b101e487ea..890dce242639 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -50,6 +50,7 @@ struct nfs_fattr {
 	} du;
 	struct nfs_fsid		fsid;
 	__u64			fileid;
+	__u64			mounted_on_fileid;
 	struct timespec		atime;
 	struct timespec		mtime;
 	struct timespec		ctime;
@@ -83,6 +84,7 @@ struct nfs_fattr {
 #define NFS_ATTR_FATTR_PRECHANGE	(1U << 18)
 #define NFS_ATTR_FATTR_V4_REFERRAL	(1U << 19)	/* NFSv4 referral */
 #define NFS_ATTR_FATTR_MOUNTPOINT	(1U << 20)	/* Treat as mountpoint */
+#define NFS_ATTR_FATTR_MOUNTED_ON_FILEID		(1U << 21)
 
 #define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
 		| NFS_ATTR_FATTR_MODE \
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index d81db8012c63..f73c482ec9c6 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -127,13 +127,16 @@ struct rpc_task_setup {
 #define RPC_TASK_KILLED		0x0100		/* task was killed */
 #define RPC_TASK_SOFT		0x0200		/* Use soft timeouts */
 #define RPC_TASK_SOFTCONN	0x0400		/* Fail if can't connect */
+#define RPC_TASK_SENT		0x0800		/* message was sent */
+#define RPC_TASK_TIMEOUT	0x1000		/* fail with ETIMEDOUT on timeout */
 
 #define RPC_IS_ASYNC(t)		((t)->tk_flags & RPC_TASK_ASYNC)
 #define RPC_IS_SWAPPER(t)	((t)->tk_flags & RPC_TASK_SWAPPER)
 #define RPC_DO_ROOTOVERRIDE(t)	((t)->tk_flags & RPC_TASK_ROOTCREDS)
 #define RPC_ASSASSINATED(t)	((t)->tk_flags & RPC_TASK_KILLED)
-#define RPC_IS_SOFT(t)		((t)->tk_flags & RPC_TASK_SOFT)
+#define RPC_IS_SOFT(t)		((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
 #define RPC_IS_SOFTCONN(t)	((t)->tk_flags & RPC_TASK_SOFTCONN)
+#define RPC_WAS_SENT(t)		((t)->tk_flags & RPC_TASK_SENT)
 
 #define RPC_TASK_RUNNING	0
 #define RPC_TASK_QUEUED		1
diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig
index 8873fd8ddacd..b2198e65d8bb 100644
--- a/net/sunrpc/Kconfig
+++ b/net/sunrpc/Kconfig
@@ -18,14 +18,13 @@ config SUNRPC_XPRT_RDMA
 	  If unsure, say N.
 
 config RPCSEC_GSS_KRB5
-	tristate
+	tristate "Secure RPC: Kerberos V mechanism"
 	depends on SUNRPC && CRYPTO
-	prompt "Secure RPC: Kerberos V mechanism" if !(NFS_V4 || NFSD_V4)
+	depends on CRYPTO_MD5 && CRYPTO_DES && CRYPTO_CBC && CRYPTO_CTS
+	depends on CRYPTO_ECB && CRYPTO_HMAC && CRYPTO_SHA1 && CRYPTO_AES
+	depends on CRYPTO_ARC4
 	default y
 	select SUNRPC_GSS
-	select CRYPTO_MD5
-	select CRYPTO_DES
-	select CRYPTO_CBC
 	help
 	  Choose Y here to enable Secure RPC using the Kerberos version 5
 	  GSS-API mechanism (RFC 1964).
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index f3914d0c5079..339ba64cce1e 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -520,7 +520,7 @@ gss_refresh_upcall(struct rpc_task *task)
 		warn_gssd();
 		task->tk_timeout = 15*HZ;
 		rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
-		return 0;
+		return -EAGAIN;
 	}
 	if (IS_ERR(gss_msg)) {
 		err = PTR_ERR(gss_msg);
@@ -563,10 +563,12 @@ retry:
 	if (PTR_ERR(gss_msg) == -EAGAIN) {
 		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
 				pipe_version >= 0, 15*HZ);
+		if (pipe_version < 0) {
+			warn_gssd();
+			err = -EACCES;
+		}
 		if (err)
 			goto out;
-		if (pipe_version < 0)
-			warn_gssd();
 		goto retry;
 	}
 	if (IS_ERR(gss_msg)) {
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index e7a96e478f63..8d83f9d48713 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1508,7 +1508,10 @@ call_timeout(struct rpc_task *task)
 		if (clnt->cl_chatty)
 			printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
 				clnt->cl_protname, clnt->cl_server);
-		rpc_exit(task, -EIO);
+		if (task->tk_flags & RPC_TASK_TIMEOUT)
+			rpc_exit(task, -ETIMEDOUT);
+		else
+			rpc_exit(task, -EIO);
 		return;
 	}
 
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 9494c3767356..ce5eb68a9664 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -906,6 +906,7 @@ void xprt_transmit(struct rpc_task *task)
 	}
 
 	dprintk("RPC: %5u xmit complete\n", task->tk_pid);
+	task->tk_flags |= RPC_TASK_SENT;
 	spin_lock_bh(&xprt->transport_lock);
 
 	xprt->ops->set_retrans_timeout(task);