NFS: Move mount parameterisation bits into their own file

Split various bits relating to mount parameterisation out from
fs/nfs/super.c into their own file to form the basis of filesystem context
handling for NFS.

No other changes are made to the code beyond removing 'static' qualifiers.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

4 files changed, 1445 insertions, 1412 deletions

diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 34cdeaecccf6..2433c3e03cfa 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -9,7 +9,7 @@ CFLAGS_nfstrace.o += -I$(src)
 nfs-y 			:= client.o dir.o file.o getroot.o inode.o super.o \
 			   io.o direct.o pagelist.o read.o symlink.o unlink.o \
 			   write.o namespace.o mount_clnt.o nfstrace.o \
-			   export.o sysfs.o
+			   export.o sysfs.o fs_context.o
 nfs-$(CONFIG_ROOT_NFS)	+= nfsroot.o
 nfs-$(CONFIG_SYSCTL)	+= sysctl.o
 nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
new file mode 100644
index 000000000000..c8f99a3c7264
--- /dev/null
+++ b/fs/nfs/fs_context.c
@@ -0,0 +1,1414 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/fs/nfs/fs_context.c
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ *
+ * NFS mount handling.
+ *
+ * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/parser.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs4_mount.h>
+#include "nfs.h"
+#include "internal.h"
+
+#define NFSDBG_FACILITY		NFSDBG_MOUNT
+
+#if IS_ENABLED(CONFIG_NFS_V3)
+#define NFS_DEFAULT_VERSION 3
+#else
+#define NFS_DEFAULT_VERSION 2
+#endif
+
+#define NFS_MAX_CONNECTIONS 16
+
+enum {
+	/* Mount options that take no arguments */
+	Opt_soft, Opt_softerr, Opt_hard,
+	Opt_posix, Opt_noposix,
+	Opt_cto, Opt_nocto,
+	Opt_ac, Opt_noac,
+	Opt_lock, Opt_nolock,
+	Opt_udp, Opt_tcp, Opt_rdma,
+	Opt_acl, Opt_noacl,
+	Opt_rdirplus, Opt_nordirplus,
+	Opt_sharecache, Opt_nosharecache,
+	Opt_resvport, Opt_noresvport,
+	Opt_fscache, Opt_nofscache,
+	Opt_migration, Opt_nomigration,
+
+	/* Mount options that take integer arguments */
+	Opt_port,
+	Opt_rsize, Opt_wsize, Opt_bsize,
+	Opt_timeo, Opt_retrans,
+	Opt_acregmin, Opt_acregmax,
+	Opt_acdirmin, Opt_acdirmax,
+	Opt_actimeo,
+	Opt_namelen,
+	Opt_mountport,
+	Opt_mountvers,
+	Opt_minorversion,
+
+	/* Mount options that take string arguments */
+	Opt_nfsvers,
+	Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
+	Opt_addr, Opt_mountaddr, Opt_clientaddr,
+	Opt_nconnect,
+	Opt_lookupcache,
+	Opt_fscache_uniq,
+	Opt_local_lock,
+
+	/* Special mount options */
+	Opt_userspace, Opt_deprecated, Opt_sloppy,
+
+	Opt_err
+};
+
+static const match_table_t nfs_mount_option_tokens = {
+	{ Opt_userspace, "bg" },
+	{ Opt_userspace, "fg" },
+	{ Opt_userspace, "retry=%s" },
+
+	{ Opt_sloppy, "sloppy" },
+
+	{ Opt_soft, "soft" },
+	{ Opt_softerr, "softerr" },
+	{ Opt_hard, "hard" },
+	{ Opt_deprecated, "intr" },
+	{ Opt_deprecated, "nointr" },
+	{ Opt_posix, "posix" },
+	{ Opt_noposix, "noposix" },
+	{ Opt_cto, "cto" },
+	{ Opt_nocto, "nocto" },
+	{ Opt_ac, "ac" },
+	{ Opt_noac, "noac" },
+	{ Opt_lock, "lock" },
+	{ Opt_nolock, "nolock" },
+	{ Opt_udp, "udp" },
+	{ Opt_tcp, "tcp" },
+	{ Opt_rdma, "rdma" },
+	{ Opt_acl, "acl" },
+	{ Opt_noacl, "noacl" },
+	{ Opt_rdirplus, "rdirplus" },
+	{ Opt_nordirplus, "nordirplus" },
+	{ Opt_sharecache, "sharecache" },
+	{ Opt_nosharecache, "nosharecache" },
+	{ Opt_resvport, "resvport" },
+	{ Opt_noresvport, "noresvport" },
+	{ Opt_fscache, "fsc" },
+	{ Opt_nofscache, "nofsc" },
+	{ Opt_migration, "migration" },
+	{ Opt_nomigration, "nomigration" },
+
+	{ Opt_port, "port=%s" },
+	{ Opt_rsize, "rsize=%s" },
+	{ Opt_wsize, "wsize=%s" },
+	{ Opt_bsize, "bsize=%s" },
+	{ Opt_timeo, "timeo=%s" },
+	{ Opt_retrans, "retrans=%s" },
+	{ Opt_acregmin, "acregmin=%s" },
+	{ Opt_acregmax, "acregmax=%s" },
+	{ Opt_acdirmin, "acdirmin=%s" },
+	{ Opt_acdirmax, "acdirmax=%s" },
+	{ Opt_actimeo, "actimeo=%s" },
+	{ Opt_namelen, "namlen=%s" },
+	{ Opt_mountport, "mountport=%s" },
+	{ Opt_mountvers, "mountvers=%s" },
+	{ Opt_minorversion, "minorversion=%s" },
+
+	{ Opt_nfsvers, "nfsvers=%s" },
+	{ Opt_nfsvers, "vers=%s" },
+
+	{ Opt_sec, "sec=%s" },
+	{ Opt_proto, "proto=%s" },
+	{ Opt_mountproto, "mountproto=%s" },
+	{ Opt_addr, "addr=%s" },
+	{ Opt_clientaddr, "clientaddr=%s" },
+	{ Opt_mounthost, "mounthost=%s" },
+	{ Opt_mountaddr, "mountaddr=%s" },
+
+	{ Opt_nconnect, "nconnect=%s" },
+
+	{ Opt_lookupcache, "lookupcache=%s" },
+	{ Opt_fscache_uniq, "fsc=%s" },
+	{ Opt_local_lock, "local_lock=%s" },
+
+	/* The following needs to be listed after all other options */
+	{ Opt_nfsvers, "v%s" },
+
+	{ Opt_err, NULL }
+};
+
+enum {
+	Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
+	Opt_xprt_rdma6,
+
+	Opt_xprt_err
+};
+
+static const match_table_t nfs_xprt_protocol_tokens = {
+	{ Opt_xprt_udp, "udp" },
+	{ Opt_xprt_udp6, "udp6" },
+	{ Opt_xprt_tcp, "tcp" },
+	{ Opt_xprt_tcp6, "tcp6" },
+	{ Opt_xprt_rdma, "rdma" },
+	{ Opt_xprt_rdma6, "rdma6" },
+
+	{ Opt_xprt_err, NULL }
+};
+
+enum {
+	Opt_sec_none, Opt_sec_sys,
+	Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
+	Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
+	Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
+
+	Opt_sec_err
+};
+
+static const match_table_t nfs_secflavor_tokens = {
+	{ Opt_sec_none, "none" },
+	{ Opt_sec_none, "null" },
+	{ Opt_sec_sys, "sys" },
+
+	{ Opt_sec_krb5, "krb5" },
+	{ Opt_sec_krb5i, "krb5i" },
+	{ Opt_sec_krb5p, "krb5p" },
+
+	{ Opt_sec_lkey, "lkey" },
+	{ Opt_sec_lkeyi, "lkeyi" },
+	{ Opt_sec_lkeyp, "lkeyp" },
+
+	{ Opt_sec_spkm, "spkm3" },
+	{ Opt_sec_spkmi, "spkm3i" },
+	{ Opt_sec_spkmp, "spkm3p" },
+
+	{ Opt_sec_err, NULL }
+};
+
+enum {
+	Opt_lookupcache_all, Opt_lookupcache_positive,
+	Opt_lookupcache_none,
+
+	Opt_lookupcache_err
+};
+
+static match_table_t nfs_lookupcache_tokens = {
+	{ Opt_lookupcache_all, "all" },
+	{ Opt_lookupcache_positive, "pos" },
+	{ Opt_lookupcache_positive, "positive" },
+	{ Opt_lookupcache_none, "none" },
+
+	{ Opt_lookupcache_err, NULL }
+};
+
+enum {
+	Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
+	Opt_local_lock_none,
+
+	Opt_local_lock_err
+};
+
+static match_table_t nfs_local_lock_tokens = {
+	{ Opt_local_lock_all, "all" },
+	{ Opt_local_lock_flock, "flock" },
+	{ Opt_local_lock_posix, "posix" },
+	{ Opt_local_lock_none, "none" },
+
+	{ Opt_local_lock_err, NULL }
+};
+
+enum {
+	Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
+	Opt_vers_4_1, Opt_vers_4_2,
+
+	Opt_vers_err
+};
+
+static match_table_t nfs_vers_tokens = {
+	{ Opt_vers_2, "2" },
+	{ Opt_vers_3, "3" },
+	{ Opt_vers_4, "4" },
+	{ Opt_vers_4_0, "4.0" },
+	{ Opt_vers_4_1, "4.1" },
+	{ Opt_vers_4_2, "4.2" },
+
+	{ Opt_vers_err, NULL }
+};
+
+struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
+{
+	struct nfs_parsed_mount_data *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data) {
+		data->timeo		= NFS_UNSPEC_TIMEO;
+		data->retrans		= NFS_UNSPEC_RETRANS;
+		data->acregmin		= NFS_DEF_ACREGMIN;
+		data->acregmax		= NFS_DEF_ACREGMAX;
+		data->acdirmin		= NFS_DEF_ACDIRMIN;
+		data->acdirmax		= NFS_DEF_ACDIRMAX;
+		data->mount_server.port	= NFS_UNSPEC_PORT;
+		data->nfs_server.port	= NFS_UNSPEC_PORT;
+		data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+		data->selected_flavor	= RPC_AUTH_MAXFLAVOR;
+		data->minorversion	= 0;
+		data->need_mount	= true;
+		data->net		= current->nsproxy->net_ns;
+		data->lsm_opts		= NULL;
+	}
+	return data;
+}
+
+void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
+{
+	if (data) {
+		kfree(data->client_address);
+		kfree(data->mount_server.hostname);
+		kfree(data->nfs_server.export_path);
+		kfree(data->nfs_server.hostname);
+		kfree(data->fscache_uniq);
+		security_free_mnt_opts(&data->lsm_opts);
+		kfree(data);
+	}
+}
+
+/*
+ * Sanity-check a server address provided by the mount command.
+ *
+ * Address family must be initialized, and address must not be
+ * the ANY address for that family.
+ */
+static int nfs_verify_server_address(struct sockaddr *addr)
+{
+	switch (addr->sa_family) {
+	case AF_INET: {
+		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
+		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
+	}
+	case AF_INET6: {
+		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
+		return !ipv6_addr_any(sa);
+	}
+	}
+
+	dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
+	return 0;
+}
+
+/*
+ * Sanity check the NFS transport protocol.
+ *
+ */
+static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
+{
+	switch (mnt->nfs_server.protocol) {
+	case XPRT_TRANSPORT_UDP:
+	case XPRT_TRANSPORT_TCP:
+	case XPRT_TRANSPORT_RDMA:
+		break;
+	default:
+		mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+	}
+}
+
+/*
+ * For text based NFSv2/v3 mounts, the mount protocol transport default
+ * settings should depend upon the specified NFS transport.
+ */
+static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
+{
+	nfs_validate_transport_protocol(mnt);
+
+	if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
+	    mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
+			return;
+	switch (mnt->nfs_server.protocol) {
+	case XPRT_TRANSPORT_UDP:
+		mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
+		break;
+	case XPRT_TRANSPORT_TCP:
+	case XPRT_TRANSPORT_RDMA:
+		mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
+	}
+}
+
+/*
+ * Add 'flavor' to 'auth_info' if not already present.
+ * Returns true if 'flavor' ends up in the list, false otherwise
+ */
+static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
+			      rpc_authflavor_t flavor)
+{
+	unsigned int i;
+	unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
+
+	/* make sure this flavor isn't already in the list */
+	for (i = 0; i < auth_info->flavor_len; i++) {
+		if (flavor == auth_info->flavors[i])
+			return true;
+	}
+
+	if (auth_info->flavor_len + 1 >= max_flavor_len) {
+		dfprintk(MOUNT, "NFS: too many sec= flavors\n");
+		return false;
+	}
+
+	auth_info->flavors[auth_info->flavor_len++] = flavor;
+	return true;
+}
+
+/*
+ * Parse the value of the 'sec=' option.
+ */
+static int nfs_parse_security_flavors(char *value,
+				      struct nfs_parsed_mount_data *mnt)
+{
+	substring_t args[MAX_OPT_ARGS];
+	rpc_authflavor_t pseudoflavor;
+	char *p;
+
+	dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
+
+	while ((p = strsep(&value, ":")) != NULL) {
+		switch (match_token(p, nfs_secflavor_tokens, args)) {
+		case Opt_sec_none:
+			pseudoflavor = RPC_AUTH_NULL;
+			break;
+		case Opt_sec_sys:
+			pseudoflavor = RPC_AUTH_UNIX;
+			break;
+		case Opt_sec_krb5:
+			pseudoflavor = RPC_AUTH_GSS_KRB5;
+			break;
+		case Opt_sec_krb5i:
+			pseudoflavor = RPC_AUTH_GSS_KRB5I;
+			break;
+		case Opt_sec_krb5p:
+			pseudoflavor = RPC_AUTH_GSS_KRB5P;
+			break;
+		case Opt_sec_lkey:
+			pseudoflavor = RPC_AUTH_GSS_LKEY;
+			break;
+		case Opt_sec_lkeyi:
+			pseudoflavor = RPC_AUTH_GSS_LKEYI;
+			break;
+		case Opt_sec_lkeyp:
+			pseudoflavor = RPC_AUTH_GSS_LKEYP;
+			break;
+		case Opt_sec_spkm:
+			pseudoflavor = RPC_AUTH_GSS_SPKM;
+			break;
+		case Opt_sec_spkmi:
+			pseudoflavor = RPC_AUTH_GSS_SPKMI;
+			break;
+		case Opt_sec_spkmp:
+			pseudoflavor = RPC_AUTH_GSS_SPKMP;
+			break;
+		default:
+			dfprintk(MOUNT,
+				 "NFS: sec= option '%s' not recognized\n", p);
+			return 0;
+		}
+
+		if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
+			return 0;
+	}
+
+	return 1;
+}
+
+static int nfs_parse_version_string(char *string,
+		struct nfs_parsed_mount_data *mnt,
+		substring_t *args)
+{
+	mnt->flags &= ~NFS_MOUNT_VER3;
+	switch (match_token(string, nfs_vers_tokens, args)) {
+	case Opt_vers_2:
+		mnt->version = 2;
+		break;
+	case Opt_vers_3:
+		mnt->flags |= NFS_MOUNT_VER3;
+		mnt->version = 3;
+		break;
+	case Opt_vers_4:
+		/* Backward compatibility option. In future,
+		 * the mount program should always supply
+		 * a NFSv4 minor version number.
+		 */
+		mnt->version = 4;
+		break;
+	case Opt_vers_4_0:
+		mnt->version = 4;
+		mnt->minorversion = 0;
+		break;
+	case Opt_vers_4_1:
+		mnt->version = 4;
+		mnt->minorversion = 1;
+		break;
+	case Opt_vers_4_2:
+		mnt->version = 4;
+		mnt->minorversion = 2;
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static int nfs_get_option_str(substring_t args[], char **option)
+{
+	kfree(*option);
+	*option = match_strdup(args);
+	return !*option;
+}
+
+static int nfs_get_option_ul(substring_t args[], unsigned long *option)
+{
+	int rc;
+	char *string;
+
+	string = match_strdup(args);
+	if (string == NULL)
+		return -ENOMEM;
+	rc = kstrtoul(string, 10, option);
+	kfree(string);
+
+	return rc;
+}
+
+static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
+		unsigned long l_bound, unsigned long u_bound)
+{
+	int ret;
+
+	ret = nfs_get_option_ul(args, option);
+	if (ret != 0)
+		return ret;
+	if (*option < l_bound || *option > u_bound)
+		return -ERANGE;
+	return 0;
+}
+
+/*
+ * Error-check and convert a string of mount options from user space into
+ * a data structure.  The whole mount string is processed; bad options are
+ * skipped as they are encountered.  If there were no errors, return 1;
+ * otherwise return 0 (zero).
+ */
+int nfs_parse_mount_options(char *raw, struct nfs_parsed_mount_data *mnt)
+{
+	char *p, *string;
+	int rc, sloppy = 0, invalid_option = 0;
+	unsigned short protofamily = AF_UNSPEC;
+	unsigned short mountfamily = AF_UNSPEC;
+
+	if (!raw) {
+		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
+		return 1;
+	}
+	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
+
+	rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
+	if (rc)
+		goto out_security_failure;
+
+	while ((p = strsep(&raw, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		unsigned long option;
+		int token;
+
+		if (!*p)
+			continue;
+
+		dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
+
+		token = match_token(p, nfs_mount_option_tokens, args);
+		switch (token) {
+
+		/*
+		 * boolean options:  foo/nofoo
+		 */
+		case Opt_soft:
+			mnt->flags |= NFS_MOUNT_SOFT;
+			mnt->flags &= ~NFS_MOUNT_SOFTERR;
+			break;
+		case Opt_softerr:
+			mnt->flags |= NFS_MOUNT_SOFTERR;
+			mnt->flags &= ~NFS_MOUNT_SOFT;
+			break;
+		case Opt_hard:
+			mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
+			break;
+		case Opt_posix:
+			mnt->flags |= NFS_MOUNT_POSIX;
+			break;
+		case Opt_noposix:
+			mnt->flags &= ~NFS_MOUNT_POSIX;
+			break;
+		case Opt_cto:
+			mnt->flags &= ~NFS_MOUNT_NOCTO;
+			break;
+		case Opt_nocto:
+			mnt->flags |= NFS_MOUNT_NOCTO;
+			break;
+		case Opt_ac:
+			mnt->flags &= ~NFS_MOUNT_NOAC;
+			break;
+		case Opt_noac:
+			mnt->flags |= NFS_MOUNT_NOAC;
+			break;
+		case Opt_lock:
+			mnt->flags &= ~NFS_MOUNT_NONLM;
+			mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+					NFS_MOUNT_LOCAL_FCNTL);
+			break;
+		case Opt_nolock:
+			mnt->flags |= NFS_MOUNT_NONLM;
+			mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+				       NFS_MOUNT_LOCAL_FCNTL);
+			break;
+		case Opt_udp:
+			mnt->flags &= ~NFS_MOUNT_TCP;
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+			break;
+		case Opt_tcp:
+			mnt->flags |= NFS_MOUNT_TCP;
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+			break;
+		case Opt_rdma:
+			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
+			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+			xprt_load_transport(p);
+			break;
+		case Opt_acl:
+			mnt->flags &= ~NFS_MOUNT_NOACL;
+			break;
+		case Opt_noacl:
+			mnt->flags |= NFS_MOUNT_NOACL;
+			break;
+		case Opt_rdirplus:
+			mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
+			break;
+		case Opt_nordirplus:
+			mnt->flags |= NFS_MOUNT_NORDIRPLUS;
+			break;
+		case Opt_sharecache:
+			mnt->flags &= ~NFS_MOUNT_UNSHARED;
+			break;
+		case Opt_nosharecache:
+			mnt->flags |= NFS_MOUNT_UNSHARED;
+			break;
+		case Opt_resvport:
+			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
+			break;
+		case Opt_noresvport:
+			mnt->flags |= NFS_MOUNT_NORESVPORT;
+			break;
+		case Opt_fscache:
+			mnt->options |= NFS_OPTION_FSCACHE;
+			kfree(mnt->fscache_uniq);
+			mnt->fscache_uniq = NULL;
+			break;
+		case Opt_nofscache:
+			mnt->options &= ~NFS_OPTION_FSCACHE;
+			kfree(mnt->fscache_uniq);
+			mnt->fscache_uniq = NULL;
+			break;
+		case Opt_migration:
+			mnt->options |= NFS_OPTION_MIGRATION;
+			break;
+		case Opt_nomigration:
+			mnt->options &= ~NFS_OPTION_MIGRATION;
+			break;
+
+		/*
+		 * options that take numeric values
+		 */
+		case Opt_port:
+			if (nfs_get_option_ul(args, &option) ||
+			    option > USHRT_MAX)
+				goto out_invalid_value;
+			mnt->nfs_server.port = option;
+			break;
+		case Opt_rsize:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->rsize = option;
+			break;
+		case Opt_wsize:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->wsize = option;
+			break;
+		case Opt_bsize:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->bsize = option;
+			break;
+		case Opt_timeo:
+			if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
+				goto out_invalid_value;
+			mnt->timeo = option;
+			break;
+		case Opt_retrans:
+			if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
+				goto out_invalid_value;
+			mnt->retrans = option;
+			break;
+		case Opt_acregmin:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->acregmin = option;
+			break;
+		case Opt_acregmax:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->acregmax = option;
+			break;
+		case Opt_acdirmin:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->acdirmin = option;
+			break;
+		case Opt_acdirmax:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->acdirmax = option;
+			break;
+		case Opt_actimeo:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->acregmin = mnt->acregmax =
+			mnt->acdirmin = mnt->acdirmax = option;
+			break;
+		case Opt_namelen:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			mnt->namlen = option;
+			break;
+		case Opt_mountport:
+			if (nfs_get_option_ul(args, &option) ||
+			    option > USHRT_MAX)
+				goto out_invalid_value;
+			mnt->mount_server.port = option;
+			break;
+		case Opt_mountvers:
+			if (nfs_get_option_ul(args, &option) ||
+			    option < NFS_MNT_VERSION ||
+			    option > NFS_MNT3_VERSION)
+				goto out_invalid_value;
+			mnt->mount_server.version = option;
+			break;
+		case Opt_minorversion:
+			if (nfs_get_option_ul(args, &option))
+				goto out_invalid_value;
+			if (option > NFS4_MAX_MINOR_VERSION)
+				goto out_invalid_value;
+			mnt->minorversion = option;
+			break;
+
+		/*
+		 * options that take text values
+		 */
+		case Opt_nfsvers:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			rc = nfs_parse_version_string(string, mnt, args);
+			kfree(string);
+			if (!rc)
+				goto out_invalid_value;
+			break;
+		case Opt_sec:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			rc = nfs_parse_security_flavors(string, mnt);
+			kfree(string);
+			if (!rc) {
+				dfprintk(MOUNT, "NFS:   unrecognized "
+						"security flavor\n");
+				return 0;
+			}
+			break;
+		case Opt_proto:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			token = match_token(string,
+					    nfs_xprt_protocol_tokens, args);
+
+			protofamily = AF_INET;
+			switch (token) {
+			case Opt_xprt_udp6:
+				protofamily = AF_INET6;
+				/* fall through */
+			case Opt_xprt_udp:
+				mnt->flags &= ~NFS_MOUNT_TCP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+				break;
+			case Opt_xprt_tcp6:
+				protofamily = AF_INET6;
+				/* fall through */
+			case Opt_xprt_tcp:
+				mnt->flags |= NFS_MOUNT_TCP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
+				break;
+			case Opt_xprt_rdma6:
+				protofamily = AF_INET6;
+				/* fall through */
+			case Opt_xprt_rdma:
+				/* vector side protocols to TCP */
+				mnt->flags |= NFS_MOUNT_TCP;
+				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
+				xprt_load_transport(string);
+				break;
+			default:
+				dfprintk(MOUNT, "NFS:   unrecognized "
+						"transport protocol\n");
+				kfree(string);
+				return 0;
+			}
+			kfree(string);
+			break;
+		case Opt_mountproto:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			token = match_token(string,
+					    nfs_xprt_protocol_tokens, args);
+			kfree(string);
+
+			mountfamily = AF_INET;
+			switch (token) {
+			case Opt_xprt_udp6:
+				mountfamily = AF_INET6;
+				/* fall through */
+			case Opt_xprt_udp:
+				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
+				break;
+			case Opt_xprt_tcp6:
+				mountfamily = AF_INET6;
+				/* fall through */
+			case Opt_xprt_tcp:
+				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
+				break;
+			case Opt_xprt_rdma: /* not used for side protocols */
+			default:
+				dfprintk(MOUNT, "NFS:   unrecognized "
+						"transport protocol\n");
+				return 0;
+			}
+			break;
+		case Opt_addr:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			mnt->nfs_server.addrlen =
+				rpc_pton(mnt->net, string, strlen(string),
+					(struct sockaddr *)
+					&mnt->nfs_server.address,
+					sizeof(mnt->nfs_server.address));
+			kfree(string);
+			if (mnt->nfs_server.addrlen == 0)
+				goto out_invalid_address;
+			break;
+		case Opt_clientaddr:
+			if (nfs_get_option_str(args, &mnt->client_address))
+				goto out_nomem;
+			break;
+		case Opt_mounthost:
+			if (nfs_get_option_str(args,
+					       &mnt->mount_server.hostname))
+				goto out_nomem;
+			break;
+		case Opt_mountaddr:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			mnt->mount_server.addrlen =
+				rpc_pton(mnt->net, string, strlen(string),
+					(struct sockaddr *)
+					&mnt->mount_server.address,
+					sizeof(mnt->mount_server.address));
+			kfree(string);
+			if (mnt->mount_server.addrlen == 0)
+				goto out_invalid_address;
+			break;
+		case Opt_nconnect:
+			if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
+				goto out_invalid_value;
+			mnt->nfs_server.nconnect = option;
+			break;
+		case Opt_lookupcache:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			token = match_token(string,
+					nfs_lookupcache_tokens, args);
+			kfree(string);
+			switch (token) {
+				case Opt_lookupcache_all:
+					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
+					break;
+				case Opt_lookupcache_positive:
+					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
+					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
+					break;
+				case Opt_lookupcache_none:
+					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
+					break;
+				default:
+					dfprintk(MOUNT, "NFS:   invalid "
+							"lookupcache argument\n");
+					return 0;
+			}
+			break;
+		case Opt_fscache_uniq:
+			if (nfs_get_option_str(args, &mnt->fscache_uniq))
+				goto out_nomem;
+			mnt->options |= NFS_OPTION_FSCACHE;
+			break;
+		case Opt_local_lock:
+			string = match_strdup(args);
+			if (string == NULL)
+				goto out_nomem;
+			token = match_token(string, nfs_local_lock_tokens,
+					args);
+			kfree(string);
+			switch (token) {
+			case Opt_local_lock_all:
+				mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
+					       NFS_MOUNT_LOCAL_FCNTL);
+				break;
+			case Opt_local_lock_flock:
+				mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
+				break;
+			case Opt_local_lock_posix:
+				mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
+				break;
+			case Opt_local_lock_none:
+				mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
+						NFS_MOUNT_LOCAL_FCNTL);
+				break;
+			default:
+				dfprintk(MOUNT, "NFS:	invalid	"
+						"local_lock argument\n");
+				return 0;
+			}
+			break;
+
+		/*
+		 * Special options
+		 */
+		case Opt_sloppy:
+			sloppy = 1;
+			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
+			break;
+		case Opt_userspace:
+		case Opt_deprecated:
+			dfprintk(MOUNT, "NFS:   ignoring mount option "
+					"'%s'\n", p);
+			break;
+
+		default:
+			invalid_option = 1;
+			dfprintk(MOUNT, "NFS:   unrecognized mount option "
+					"'%s'\n", p);
+		}
+	}
+
+	if (!sloppy && invalid_option)
+		return 0;
+
+	if (mnt->minorversion && mnt->version != 4)
+		goto out_minorversion_mismatch;
+
+	if (mnt->options & NFS_OPTION_MIGRATION &&
+	    (mnt->version != 4 || mnt->minorversion != 0))
+		goto out_migration_misuse;
+
+	/*
+	 * verify that any proto=/mountproto= options match the address
+	 * families in the addr=/mountaddr= options.
+	 */
+	if (protofamily != AF_UNSPEC &&
+	    protofamily != mnt->nfs_server.address.ss_family)
+		goto out_proto_mismatch;
+
+	if (mountfamily != AF_UNSPEC) {
+		if (mnt->mount_server.addrlen) {
+			if (mountfamily != mnt->mount_server.address.ss_family)
+				goto out_mountproto_mismatch;
+		} else {
+			if (mountfamily != mnt->nfs_server.address.ss_family)
+				goto out_mountproto_mismatch;
+		}
+	}
+
+	return 1;
+
+out_mountproto_mismatch:
+	printk(KERN_INFO "NFS: mount server address does not match mountproto= "
+			 "option\n");
+	return 0;
+out_proto_mismatch:
+	printk(KERN_INFO "NFS: server address does not match proto= option\n");
+	return 0;
+out_invalid_address:
+	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
+	return 0;
+out_invalid_value:
+	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
+	return 0;
+out_minorversion_mismatch:
+	printk(KERN_INFO "NFS: mount option vers=%u does not support "
+			 "minorversion=%u\n", mnt->version, mnt->minorversion);
+	return 0;
+out_migration_misuse:
+	printk(KERN_INFO
+		"NFS: 'migration' not supported for this NFS version\n");
+	return 0;
+out_nomem:
+	printk(KERN_INFO "NFS: not enough memory to parse option\n");
+	return 0;
+out_security_failure:
+	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
+	return 0;
+}
+
+/*
+ * Split "dev_name" into "hostname:export_path".
+ *
+ * The leftmost colon demarks the split between the server's hostname
+ * and the export path.  If the hostname starts with a left square
+ * bracket, then it may contain colons.
+ *
+ * Note: caller frees hostname and export path, even on error.
+ */
+static int nfs_parse_devname(const char *dev_name,
+			     char **hostname, size_t maxnamlen,
+			     char **export_path, size_t maxpathlen)
+{
+	size_t len;
+	char *end;
+
+	if (unlikely(!dev_name || !*dev_name)) {
+		dfprintk(MOUNT, "NFS: device name not specified\n");
+		return -EINVAL;
+	}
+
+	/* Is the host name protected with square brakcets? */
+	if (*dev_name == '[') {
+		end = strchr(++dev_name, ']');
+		if (end == NULL || end[1] != ':')
+			goto out_bad_devname;
+
+		len = end - dev_name;
+		end++;
+	} else {
+		char *comma;
+
+		end = strchr(dev_name, ':');
+		if (end == NULL)
+			goto out_bad_devname;
+		len = end - dev_name;
+
+		/* kill possible hostname list: not supported */
+		comma = strchr(dev_name, ',');
+		if (comma != NULL && comma < end)
+			len = comma - dev_name;
+	}
+
+	if (len > maxnamlen)
+		goto out_hostname;
+
+	/* N.B. caller will free nfs_server.hostname in all cases */
+	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
+	if (*hostname == NULL)
+		goto out_nomem;
+	len = strlen(++end);
+	if (len > maxpathlen)
+		goto out_path;
+	*export_path = kstrndup(end, len, GFP_KERNEL);
+	if (!*export_path)
+		goto out_nomem;
+
+	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
+	return 0;
+
+out_bad_devname:
+	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
+	return -EINVAL;
+
+out_nomem:
+	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
+	return -ENOMEM;
+
+out_hostname:
+	dfprintk(MOUNT, "NFS: server hostname too long\n");
+	return -ENAMETOOLONG;
+
+out_path:
+	dfprintk(MOUNT, "NFS: export pathname too long\n");
+	return -ENAMETOOLONG;
+}
+
+/*
+ * Validate the NFS2/NFS3 mount data
+ * - fills in the mount root filehandle
+ *
+ * For option strings, user space handles the following behaviors:
+ *
+ * + DNS: mapping server host name to IP address ("addr=" option)
+ *
+ * + failure mode: how to behave if a mount request can't be handled
+ *   immediately ("fg/bg" option)
+ *
+ * + retry: how often to retry a mount request ("retry=" option)
+ *
+ * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
+ *   mountproto=tcp after mountproto=udp, and so on
+ */
+static int nfs23_validate_mount_data(void *options,
+				     struct nfs_parsed_mount_data *args,
+				     struct nfs_fh *mntfh,
+				     const char *dev_name)
+{
+	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
+	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
+	int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
+
+	if (data == NULL)
+		goto out_no_data;
+
+	args->version = NFS_DEFAULT_VERSION;
+	switch (data->version) {
+	case 1:
+		data->namlen = 0; /* fall through */
+	case 2:
+		data->bsize = 0; /* fall through */
+	case 3:
+		if (data->flags & NFS_MOUNT_VER3)
+			goto out_no_v3;
+		data->root.size = NFS2_FHSIZE;
+		memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
+		/* Turn off security negotiation */
+		extra_flags |= NFS_MOUNT_SECFLAVOUR;
+		/* fall through */
+	case 4:
+		if (data->flags & NFS_MOUNT_SECFLAVOUR)
+			goto out_no_sec;
+		/* fall through */
+	case 5:
+		memset(data->context, 0, sizeof(data->context));
+		/* fall through */
+	case 6:
+		if (data->flags & NFS_MOUNT_VER3) {
+			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
+				goto out_invalid_fh;
+			mntfh->size = data->root.size;
+			args->version = 3;
+		} else {
+			mntfh->size = NFS2_FHSIZE;
+			args->version = 2;
+		}
+
+
+		memcpy(mntfh->data, data->root.data, mntfh->size);
+		if (mntfh->size < sizeof(mntfh->data))
+			memset(mntfh->data + mntfh->size, 0,
+			       sizeof(mntfh->data) - mntfh->size);
+
+		/*
+		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
+		 * can deal with.
+		 */
+		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
+		args->flags		|= extra_flags;
+		args->rsize		= data->rsize;
+		args->wsize		= data->wsize;
+		args->timeo		= data->timeo;
+		args->retrans		= data->retrans;
+		args->acregmin		= data->acregmin;
+		args->acregmax		= data->acregmax;
+		args->acdirmin		= data->acdirmin;
+		args->acdirmax		= data->acdirmax;
+		args->need_mount	= false;
+
+		memcpy(sap, &data->addr, sizeof(data->addr));
+		args->nfs_server.addrlen = sizeof(data->addr);
+		args->nfs_server.port = ntohs(data->addr.sin_port);
+		if (sap->sa_family != AF_INET ||
+		    !nfs_verify_server_address(sap))
+			goto out_no_address;
+
+		if (!(data->flags & NFS_MOUNT_TCP))
+			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
+		/* N.B. caller will free nfs_server.hostname in all cases */
+		args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
+		args->namlen		= data->namlen;
+		args->bsize		= data->bsize;
+
+		if (data->flags & NFS_MOUNT_SECFLAVOUR)
+			args->selected_flavor = data->pseudoflavor;
+		else
+			args->selected_flavor = RPC_AUTH_UNIX;
+		if (!args->nfs_server.hostname)
+			goto out_nomem;
+
+		if (!(data->flags & NFS_MOUNT_NONLM))
+			args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
+					 NFS_MOUNT_LOCAL_FCNTL);
+		else
+			args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
+					NFS_MOUNT_LOCAL_FCNTL);
+		/*
+		 * The legacy version 6 binary mount data from userspace has a
+		 * field used only to transport selinux information into the
+		 * the kernel.  To continue to support that functionality we
+		 * have a touch of selinux knowledge here in the NFS code. The
+		 * userspace code converted context=blah to just blah so we are
+		 * converting back to the full string selinux understands.
+		 */
+		if (data->context[0]){
+#ifdef CONFIG_SECURITY_SELINUX
+			int rc;
+			data->context[NFS_MAX_CONTEXT_LEN] = '\0';
+			rc = security_add_mnt_opt("context", data->context,
+					strlen(data->context), &args->lsm_opts);
+			if (rc)
+				return rc;
+#else
+			return -EINVAL;
+#endif
+		}
+
+		break;
+	default:
+		return NFS_TEXT_DATA;
+	}
+
+	return 0;
+
+out_no_data:
+	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
+	return -EINVAL;
+
+out_no_v3:
+	dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
+		 data->version);
+	return -EINVAL;
+
+out_no_sec:
+	dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
+	return -EINVAL;
+
+out_nomem:
+	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
+	return -ENOMEM;
+
+out_no_address:
+	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
+	return -EINVAL;
+
+out_invalid_fh:
+	dfprintk(MOUNT, "NFS: invalid root filehandle\n");
+	return -EINVAL;
+}
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+
+static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
+{
+	args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
+			 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
+}
+
+/*
+ * Validate NFSv4 mount options
+ */
+static int nfs4_validate_mount_data(void *options,
+				    struct nfs_parsed_mount_data *args,
+				    const char *dev_name)
+{
+	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
+	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
+	char *c;
+
+	if (data == NULL)
+		goto out_no_data;
+
+	args->version = 4;
+
+	switch (data->version) {
+	case 1:
+		if (data->host_addrlen > sizeof(args->nfs_server.address))
+			goto out_no_address;
+		if (data->host_addrlen == 0)
+			goto out_no_address;
+		args->nfs_server.addrlen = data->host_addrlen;
+		if (copy_from_user(sap, data->host_addr, data->host_addrlen))
+			return -EFAULT;
+		if (!nfs_verify_server_address(sap))
+			goto out_no_address;
+		args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
+
+		if (data->auth_flavourlen) {
+			rpc_authflavor_t pseudoflavor;
+			if (data->auth_flavourlen > 1)
+				goto out_inval_auth;
+			if (copy_from_user(&pseudoflavor,
+					   data->auth_flavours,
+					   sizeof(pseudoflavor)))
+				return -EFAULT;
+			args->selected_flavor = pseudoflavor;
+		} else
+			args->selected_flavor = RPC_AUTH_UNIX;
+
+		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
+		if (IS_ERR(c))
+			return PTR_ERR(c);
+		args->nfs_server.hostname = c;
+
+		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
+		if (IS_ERR(c))
+			return PTR_ERR(c);
+		args->nfs_server.export_path = c;
+		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
+
+		c = strndup_user(data->client_addr.data, 16);
+		if (IS_ERR(c))
+			return PTR_ERR(c);
+		args->client_address = c;
+
+		/*
+		 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
+		 * can deal with.
+		 */
+
+		args->flags	= data->flags & NFS4_MOUNT_FLAGMASK;
+		args->rsize	= data->rsize;
+		args->wsize	= data->wsize;
+		args->timeo	= data->timeo;
+		args->retrans	= data->retrans;
+		args->acregmin	= data->acregmin;
+		args->acregmax	= data->acregmax;
+		args->acdirmin	= data->acdirmin;
+		args->acdirmax	= data->acdirmax;
+		args->nfs_server.protocol = data->proto;
+		nfs_validate_transport_protocol(args);
+		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
+			goto out_invalid_transport_udp;
+
+		break;
+	default:
+		return NFS_TEXT_DATA;
+	}
+
+	return 0;
+
+out_no_data:
+	dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
+	return -EINVAL;
+
+out_inval_auth:
+	dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
+		 data->auth_flavourlen);
+	return -EINVAL;
+
+out_no_address:
+	dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
+	return -EINVAL;
+
+out_invalid_transport_udp:
+	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
+	return -EINVAL;
+}
+
+int nfs_validate_mount_data(struct file_system_type *fs_type,
+			    void *options,
+			    struct nfs_parsed_mount_data *args,
+			    struct nfs_fh *mntfh,
+			    const char *dev_name)
+{
+	if (fs_type == &nfs_fs_type)
+		return nfs23_validate_mount_data(options, args, mntfh, dev_name);
+	return nfs4_validate_mount_data(options, args, dev_name);
+}
+#else
+int nfs_validate_mount_data(struct file_system_type *fs_type,
+			    void *options,
+			    struct nfs_parsed_mount_data *args,
+			    struct nfs_fh *mntfh,
+			    const char *dev_name)
+{
+	return nfs23_validate_mount_data(options, args, mntfh, dev_name);
+}
+#endif
+
+int nfs_validate_text_mount_data(void *options,
+				 struct nfs_parsed_mount_data *args,
+				 const char *dev_name)
+{
+	int port = 0;
+	int max_namelen = PAGE_SIZE;
+	int max_pathlen = NFS_MAXPATHLEN;
+	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
+
+	if (nfs_parse_mount_options((char *)options, args) == 0)
+		return -EINVAL;
+
+	if (!nfs_verify_server_address(sap))
+		goto out_no_address;
+
+	if (args->version == 4) {
+#if IS_ENABLED(CONFIG_NFS_V4)
+		if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
+			port = NFS_RDMA_PORT;
+		else
+			port = NFS_PORT;
+		max_namelen = NFS4_MAXNAMLEN;
+		max_pathlen = NFS4_MAXPATHLEN;
+		nfs_validate_transport_protocol(args);
+		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
+			goto out_invalid_transport_udp;
+		nfs4_validate_mount_flags(args);
+#else
+		goto out_v4_not_compiled;
+#endif /* CONFIG_NFS_V4 */
+	} else {
+		nfs_set_mount_transport_protocol(args);
+		if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
+			port = NFS_RDMA_PORT;
+	}
+
+	nfs_set_port(sap, &args->nfs_server.port, port);
+
+	return nfs_parse_devname(dev_name,
+				   &args->nfs_server.hostname,
+				   max_namelen,
+				   &args->nfs_server.export_path,
+				   max_pathlen);
+
+#if !IS_ENABLED(CONFIG_NFS_V4)
+out_v4_not_compiled:
+	dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
+	return -EPROTONOSUPPORT;
+#else
+out_invalid_transport_udp:
+	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
+	return -EINVAL;
+#endif /* !CONFIG_NFS_V4 */
+
+out_no_address:
+	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
+	return -EINVAL;
+}
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index a467e43fc682..28ab31fc5aa6 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -7,6 +7,7 @@
 #include <linux/mount.h>
 #include <linux/security.h>
 #include <linux/crc32.h>
+#include <linux/sunrpc/addr.h>
 #include <linux/nfs_page.h>
 #include <linux/wait_bit.h>
 
@@ -224,6 +225,22 @@ extern const struct svc_version nfs4_callback_version1;
 extern const struct svc_version nfs4_callback_version4;
 
 struct nfs_pageio_descriptor;
+
+/* mount.c */
+#define NFS_TEXT_DATA		1
+
+extern struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void);
+extern void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data);
+extern int nfs_parse_mount_options(char *raw, struct nfs_parsed_mount_data *mnt);
+extern int nfs_validate_mount_data(struct file_system_type *fs_type,
+				   void *options,
+				   struct nfs_parsed_mount_data *args,
+				   struct nfs_fh *mntfh,
+				   const char *dev_name);
+extern int nfs_validate_text_mount_data(void *options,
+					struct nfs_parsed_mount_data *args,
+					const char *dev_name);
+
 /* pagelist.c */
 extern int __init nfs_init_nfspagecache(void);
 extern void nfs_destroy_nfspagecache(void);
@@ -765,3 +782,16 @@ static inline bool nfs_error_is_fatal_on_server(int err)
 	}
 	return nfs_error_is_fatal(err);
 }
+
+/*
+ * Select between a default port value and a user-specified port value.
+ * If a zero value is set, then autobind will be used.
+ */
+static inline void nfs_set_port(struct sockaddr *sap, int *port,
+				const unsigned short default_port)
+{
+	if (*port == NFS_UNSPEC_PORT)
+		*port = default_port;
+
+	rpc_set_port(sap, *port);
+}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index de00f89dbe6e..b07585f62c65 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -69,229 +69,6 @@
 #include "nfs.h"
 
 #define NFSDBG_FACILITY		NFSDBG_VFS
-#define NFS_TEXT_DATA		1
-
-#if IS_ENABLED(CONFIG_NFS_V3)
-#define NFS_DEFAULT_VERSION 3
-#else
-#define NFS_DEFAULT_VERSION 2
-#endif
-
-#define NFS_MAX_CONNECTIONS 16
-
-enum {
-	/* Mount options that take no arguments */
-	Opt_soft, Opt_softerr, Opt_hard,
-	Opt_posix, Opt_noposix,
-	Opt_cto, Opt_nocto,
-	Opt_ac, Opt_noac,
-	Opt_lock, Opt_nolock,
-	Opt_udp, Opt_tcp, Opt_rdma,
-	Opt_acl, Opt_noacl,
-	Opt_rdirplus, Opt_nordirplus,
-	Opt_sharecache, Opt_nosharecache,
-	Opt_resvport, Opt_noresvport,
-	Opt_fscache, Opt_nofscache,
-	Opt_migration, Opt_nomigration,
-
-	/* Mount options that take integer arguments */
-	Opt_port,
-	Opt_rsize, Opt_wsize, Opt_bsize,
-	Opt_timeo, Opt_retrans,
-	Opt_acregmin, Opt_acregmax,
-	Opt_acdirmin, Opt_acdirmax,
-	Opt_actimeo,
-	Opt_namelen,
-	Opt_mountport,
-	Opt_mountvers,
-	Opt_minorversion,
-
-	/* Mount options that take string arguments */
-	Opt_nfsvers,
-	Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
-	Opt_addr, Opt_mountaddr, Opt_clientaddr,
-	Opt_nconnect,
-	Opt_lookupcache,
-	Opt_fscache_uniq,
-	Opt_local_lock,
-
-	/* Special mount options */
-	Opt_userspace, Opt_deprecated, Opt_sloppy,
-
-	Opt_err
-};
-
-static const match_table_t nfs_mount_option_tokens = {
-	{ Opt_userspace, "bg" },
-	{ Opt_userspace, "fg" },
-	{ Opt_userspace, "retry=%s" },
-
-	{ Opt_sloppy, "sloppy" },
-
-	{ Opt_soft, "soft" },
-	{ Opt_softerr, "softerr" },
-	{ Opt_hard, "hard" },
-	{ Opt_deprecated, "intr" },
-	{ Opt_deprecated, "nointr" },
-	{ Opt_posix, "posix" },
-	{ Opt_noposix, "noposix" },
-	{ Opt_cto, "cto" },
-	{ Opt_nocto, "nocto" },
-	{ Opt_ac, "ac" },
-	{ Opt_noac, "noac" },
-	{ Opt_lock, "lock" },
-	{ Opt_nolock, "nolock" },
-	{ Opt_udp, "udp" },
-	{ Opt_tcp, "tcp" },
-	{ Opt_rdma, "rdma" },
-	{ Opt_acl, "acl" },
-	{ Opt_noacl, "noacl" },
-	{ Opt_rdirplus, "rdirplus" },
-	{ Opt_nordirplus, "nordirplus" },
-	{ Opt_sharecache, "sharecache" },
-	{ Opt_nosharecache, "nosharecache" },
-	{ Opt_resvport, "resvport" },
-	{ Opt_noresvport, "noresvport" },
-	{ Opt_fscache, "fsc" },
-	{ Opt_nofscache, "nofsc" },
-	{ Opt_migration, "migration" },
-	{ Opt_nomigration, "nomigration" },
-
-	{ Opt_port, "port=%s" },
-	{ Opt_rsize, "rsize=%s" },
-	{ Opt_wsize, "wsize=%s" },
-	{ Opt_bsize, "bsize=%s" },
-	{ Opt_timeo, "timeo=%s" },
-	{ Opt_retrans, "retrans=%s" },
-	{ Opt_acregmin, "acregmin=%s" },
-	{ Opt_acregmax, "acregmax=%s" },
-	{ Opt_acdirmin, "acdirmin=%s" },
-	{ Opt_acdirmax, "acdirmax=%s" },
-	{ Opt_actimeo, "actimeo=%s" },
-	{ Opt_namelen, "namlen=%s" },
-	{ Opt_mountport, "mountport=%s" },
-	{ Opt_mountvers, "mountvers=%s" },
-	{ Opt_minorversion, "minorversion=%s" },
-
-	{ Opt_nfsvers, "nfsvers=%s" },
-	{ Opt_nfsvers, "vers=%s" },
-
-	{ Opt_sec, "sec=%s" },
-	{ Opt_proto, "proto=%s" },
-	{ Opt_mountproto, "mountproto=%s" },
-	{ Opt_addr, "addr=%s" },
-	{ Opt_clientaddr, "clientaddr=%s" },
-	{ Opt_mounthost, "mounthost=%s" },
-	{ Opt_mountaddr, "mountaddr=%s" },
-
-	{ Opt_nconnect, "nconnect=%s" },
-
-	{ Opt_lookupcache, "lookupcache=%s" },
-	{ Opt_fscache_uniq, "fsc=%s" },
-	{ Opt_local_lock, "local_lock=%s" },
-
-	/* The following needs to be listed after all other options */
-	{ Opt_nfsvers, "v%s" },
-
-	{ Opt_err, NULL }
-};
-
-enum {
-	Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
-	Opt_xprt_rdma6,
-
-	Opt_xprt_err
-};
-
-static const match_table_t nfs_xprt_protocol_tokens = {
-	{ Opt_xprt_udp, "udp" },
-	{ Opt_xprt_udp6, "udp6" },
-	{ Opt_xprt_tcp, "tcp" },
-	{ Opt_xprt_tcp6, "tcp6" },
-	{ Opt_xprt_rdma, "rdma" },
-	{ Opt_xprt_rdma6, "rdma6" },
-
-	{ Opt_xprt_err, NULL }
-};
-
-enum {
-	Opt_sec_none, Opt_sec_sys,
-	Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
-	Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
-	Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
-
-	Opt_sec_err
-};
-
-static const match_table_t nfs_secflavor_tokens = {
-	{ Opt_sec_none, "none" },
-	{ Opt_sec_none, "null" },
-	{ Opt_sec_sys, "sys" },
-
-	{ Opt_sec_krb5, "krb5" },
-	{ Opt_sec_krb5i, "krb5i" },
-	{ Opt_sec_krb5p, "krb5p" },
-
-	{ Opt_sec_lkey, "lkey" },
-	{ Opt_sec_lkeyi, "lkeyi" },
-	{ Opt_sec_lkeyp, "lkeyp" },
-
-	{ Opt_sec_spkm, "spkm3" },
-	{ Opt_sec_spkmi, "spkm3i" },
-	{ Opt_sec_spkmp, "spkm3p" },
-
-	{ Opt_sec_err, NULL }
-};
-
-enum {
-	Opt_lookupcache_all, Opt_lookupcache_positive,
-	Opt_lookupcache_none,
-
-	Opt_lookupcache_err
-};
-
-static match_table_t nfs_lookupcache_tokens = {
-	{ Opt_lookupcache_all, "all" },
-	{ Opt_lookupcache_positive, "pos" },
-	{ Opt_lookupcache_positive, "positive" },
-	{ Opt_lookupcache_none, "none" },
-
-	{ Opt_lookupcache_err, NULL }
-};
-
-enum {
-	Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
-	Opt_local_lock_none,
-
-	Opt_local_lock_err
-};
-
-static match_table_t nfs_local_lock_tokens = {
-	{ Opt_local_lock_all, "all" },
-	{ Opt_local_lock_flock, "flock" },
-	{ Opt_local_lock_posix, "posix" },
-	{ Opt_local_lock_none, "none" },
-
-	{ Opt_local_lock_err, NULL }
-};
-
-enum {
-	Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
-	Opt_vers_4_1, Opt_vers_4_2,
-
-	Opt_vers_err
-};
-
-static match_table_t nfs_vers_tokens = {
-	{ Opt_vers_2, "2" },
-	{ Opt_vers_3, "3" },
-	{ Opt_vers_4, "4" },
-	{ Opt_vers_4_0, "4.0" },
-	{ Opt_vers_4_1, "4.1" },
-	{ Opt_vers_4_2, "4.2" },
-
-	{ Opt_vers_err, NULL }
-};
 
 static struct dentry *nfs_prepared_mount(struct file_system_type *fs_type,
 		int flags, const char *dev_name, void *raw_data);
@@ -332,10 +109,6 @@ const struct super_operations nfs_sops = {
 EXPORT_SYMBOL_GPL(nfs_sops);
 
 #if IS_ENABLED(CONFIG_NFS_V4)
-static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
-static int nfs4_validate_mount_data(void *options,
-	struct nfs_parsed_mount_data *args, const char *dev_name);
-
 struct file_system_type nfs4_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "nfs4",
@@ -932,141 +705,6 @@ void nfs_umount_begin(struct super_block *sb)
 }
 EXPORT_SYMBOL_GPL(nfs_umount_begin);
 
-static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
-{
-	struct nfs_parsed_mount_data *data;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (data) {
-		data->timeo		= NFS_UNSPEC_TIMEO;
-		data->retrans		= NFS_UNSPEC_RETRANS;
-		data->acregmin		= NFS_DEF_ACREGMIN;
-		data->acregmax		= NFS_DEF_ACREGMAX;
-		data->acdirmin		= NFS_DEF_ACDIRMIN;
-		data->acdirmax		= NFS_DEF_ACDIRMAX;
-		data->mount_server.port	= NFS_UNSPEC_PORT;
-		data->nfs_server.port	= NFS_UNSPEC_PORT;
-		data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-		data->selected_flavor	= RPC_AUTH_MAXFLAVOR;
-		data->minorversion	= 0;
-		data->need_mount	= true;
-		data->net		= current->nsproxy->net_ns;
-		data->lsm_opts		= NULL;
-	}
-	return data;
-}
-
-static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
-{
-	if (data) {
-		kfree(data->client_address);
-		kfree(data->mount_server.hostname);
-		kfree(data->nfs_server.export_path);
-		kfree(data->nfs_server.hostname);
-		kfree(data->fscache_uniq);
-		security_free_mnt_opts(&data->lsm_opts);
-		kfree(data);
-	}
-}
-
-/*
- * Sanity-check a server address provided by the mount command.
- *
- * Address family must be initialized, and address must not be
- * the ANY address for that family.
- */
-static int nfs_verify_server_address(struct sockaddr *addr)
-{
-	switch (addr->sa_family) {
-	case AF_INET: {
-		struct sockaddr_in *sa = (struct sockaddr_in *)addr;
-		return sa->sin_addr.s_addr != htonl(INADDR_ANY);
-	}
-	case AF_INET6: {
-		struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
-		return !ipv6_addr_any(sa);
-	}
-	}
-
-	dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
-	return 0;
-}
-
-/*
- * Select between a default port value and a user-specified port value.
- * If a zero value is set, then autobind will be used.
- */
-static void nfs_set_port(struct sockaddr *sap, int *port,
-				 const unsigned short default_port)
-{
-	if (*port == NFS_UNSPEC_PORT)
-		*port = default_port;
-
-	rpc_set_port(sap, *port);
-}
-
-/*
- * Sanity check the NFS transport protocol.
- *
- */
-static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
-{
-	switch (mnt->nfs_server.protocol) {
-	case XPRT_TRANSPORT_UDP:
-	case XPRT_TRANSPORT_TCP:
-	case XPRT_TRANSPORT_RDMA:
-		break;
-	default:
-		mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-	}
-}
-
-/*
- * For text based NFSv2/v3 mounts, the mount protocol transport default
- * settings should depend upon the specified NFS transport.
- */
-static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
-{
-	nfs_validate_transport_protocol(mnt);
-
-	if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
-	    mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
-			return;
-	switch (mnt->nfs_server.protocol) {
-	case XPRT_TRANSPORT_UDP:
-		mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
-		break;
-	case XPRT_TRANSPORT_TCP:
-	case XPRT_TRANSPORT_RDMA:
-		mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
-	}
-}
-
-/*
- * Add 'flavor' to 'auth_info' if not already present.
- * Returns true if 'flavor' ends up in the list, false otherwise
- */
-static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
-			      rpc_authflavor_t flavor)
-{
-	unsigned int i;
-	unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
-
-	/* make sure this flavor isn't already in the list */
-	for (i = 0; i < auth_info->flavor_len; i++) {
-		if (flavor == auth_info->flavors[i])
-			return true;
-	}
-
-	if (auth_info->flavor_len + 1 >= max_flavor_len) {
-		dfprintk(MOUNT, "NFS: too many sec= flavors\n");
-		return false;
-	}
-
-	auth_info->flavors[auth_info->flavor_len++] = flavor;
-	return true;
-}
-
 /*
  * Return true if 'match' is in auth_info or auth_info is empty.
  * Return false otherwise.
@@ -1088,627 +726,6 @@ bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
 
 /*
- * Parse the value of the 'sec=' option.
- */
-static int nfs_parse_security_flavors(char *value,
-				      struct nfs_parsed_mount_data *mnt)
-{
-	substring_t args[MAX_OPT_ARGS];
-	rpc_authflavor_t pseudoflavor;
-	char *p;
-
-	dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
-
-	while ((p = strsep(&value, ":")) != NULL) {
-		switch (match_token(p, nfs_secflavor_tokens, args)) {
-		case Opt_sec_none:
-			pseudoflavor = RPC_AUTH_NULL;
-			break;
-		case Opt_sec_sys:
-			pseudoflavor = RPC_AUTH_UNIX;
-			break;
-		case Opt_sec_krb5:
-			pseudoflavor = RPC_AUTH_GSS_KRB5;
-			break;
-		case Opt_sec_krb5i:
-			pseudoflavor = RPC_AUTH_GSS_KRB5I;
-			break;
-		case Opt_sec_krb5p:
-			pseudoflavor = RPC_AUTH_GSS_KRB5P;
-			break;
-		case Opt_sec_lkey:
-			pseudoflavor = RPC_AUTH_GSS_LKEY;
-			break;
-		case Opt_sec_lkeyi:
-			pseudoflavor = RPC_AUTH_GSS_LKEYI;
-			break;
-		case Opt_sec_lkeyp:
-			pseudoflavor = RPC_AUTH_GSS_LKEYP;
-			break;
-		case Opt_sec_spkm:
-			pseudoflavor = RPC_AUTH_GSS_SPKM;
-			break;
-		case Opt_sec_spkmi:
-			pseudoflavor = RPC_AUTH_GSS_SPKMI;
-			break;
-		case Opt_sec_spkmp:
-			pseudoflavor = RPC_AUTH_GSS_SPKMP;
-			break;
-		default:
-			dfprintk(MOUNT,
-				 "NFS: sec= option '%s' not recognized\n", p);
-			return 0;
-		}
-
-		if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
-			return 0;
-	}
-
-	return 1;
-}
-
-static int nfs_parse_version_string(char *string,
-		struct nfs_parsed_mount_data *mnt,
-		substring_t *args)
-{
-	mnt->flags &= ~NFS_MOUNT_VER3;
-	switch (match_token(string, nfs_vers_tokens, args)) {
-	case Opt_vers_2:
-		mnt->version = 2;
-		break;
-	case Opt_vers_3:
-		mnt->flags |= NFS_MOUNT_VER3;
-		mnt->version = 3;
-		break;
-	case Opt_vers_4:
-		/* Backward compatibility option. In future,
-		 * the mount program should always supply
-		 * a NFSv4 minor version number.
-		 */
-		mnt->version = 4;
-		break;
-	case Opt_vers_4_0:
-		mnt->version = 4;
-		mnt->minorversion = 0;
-		break;
-	case Opt_vers_4_1:
-		mnt->version = 4;
-		mnt->minorversion = 1;
-		break;
-	case Opt_vers_4_2:
-		mnt->version = 4;
-		mnt->minorversion = 2;
-		break;
-	default:
-		return 0;
-	}
-	return 1;
-}
-
-static int nfs_get_option_str(substring_t args[], char **option)
-{
-	kfree(*option);
-	*option = match_strdup(args);
-	return !*option;
-}
-
-static int nfs_get_option_ul(substring_t args[], unsigned long *option)
-{
-	int rc;
-	char *string;
-
-	string = match_strdup(args);
-	if (string == NULL)
-		return -ENOMEM;
-	rc = kstrtoul(string, 10, option);
-	kfree(string);
-
-	return rc;
-}
-
-static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
-		unsigned long l_bound, unsigned long u_bound)
-{
-	int ret;
-
-	ret = nfs_get_option_ul(args, option);
-	if (ret != 0)
-		return ret;
-	if (*option < l_bound || *option > u_bound)
-		return -ERANGE;
-	return 0;
-}
-
-/*
- * Error-check and convert a string of mount options from user space into
- * a data structure.  The whole mount string is processed; bad options are
- * skipped as they are encountered.  If there were no errors, return 1;
- * otherwise return 0 (zero).
- */
-static int nfs_parse_mount_options(char *raw,
-				   struct nfs_parsed_mount_data *mnt)
-{
-	char *p, *string;
-	int rc, sloppy = 0, invalid_option = 0;
-	unsigned short protofamily = AF_UNSPEC;
-	unsigned short mountfamily = AF_UNSPEC;
-
-	if (!raw) {
-		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
-		return 1;
-	}
-	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
-
-	rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
-	if (rc)
-		goto out_security_failure;
-
-	while ((p = strsep(&raw, ",")) != NULL) {
-		substring_t args[MAX_OPT_ARGS];
-		unsigned long option;
-		int token;
-
-		if (!*p)
-			continue;
-
-		dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
-
-		token = match_token(p, nfs_mount_option_tokens, args);
-		switch (token) {
-
-		/*
-		 * boolean options:  foo/nofoo
-		 */
-		case Opt_soft:
-			mnt->flags |= NFS_MOUNT_SOFT;
-			mnt->flags &= ~NFS_MOUNT_SOFTERR;
-			break;
-		case Opt_softerr:
-			mnt->flags |= NFS_MOUNT_SOFTERR;
-			mnt->flags &= ~NFS_MOUNT_SOFT;
-			break;
-		case Opt_hard:
-			mnt->flags &= ~(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR);
-			break;
-		case Opt_posix:
-			mnt->flags |= NFS_MOUNT_POSIX;
-			break;
-		case Opt_noposix:
-			mnt->flags &= ~NFS_MOUNT_POSIX;
-			break;
-		case Opt_cto:
-			mnt->flags &= ~NFS_MOUNT_NOCTO;
-			break;
-		case Opt_nocto:
-			mnt->flags |= NFS_MOUNT_NOCTO;
-			break;
-		case Opt_ac:
-			mnt->flags &= ~NFS_MOUNT_NOAC;
-			break;
-		case Opt_noac:
-			mnt->flags |= NFS_MOUNT_NOAC;
-			break;
-		case Opt_lock:
-			mnt->flags &= ~NFS_MOUNT_NONLM;
-			mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
-					NFS_MOUNT_LOCAL_FCNTL);
-			break;
-		case Opt_nolock:
-			mnt->flags |= NFS_MOUNT_NONLM;
-			mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
-				       NFS_MOUNT_LOCAL_FCNTL);
-			break;
-		case Opt_udp:
-			mnt->flags &= ~NFS_MOUNT_TCP;
-			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
-			break;
-		case Opt_tcp:
-			mnt->flags |= NFS_MOUNT_TCP;
-			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-			break;
-		case Opt_rdma:
-			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
-			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
-			xprt_load_transport(p);
-			break;
-		case Opt_acl:
-			mnt->flags &= ~NFS_MOUNT_NOACL;
-			break;
-		case Opt_noacl:
-			mnt->flags |= NFS_MOUNT_NOACL;
-			break;
-		case Opt_rdirplus:
-			mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
-			break;
-		case Opt_nordirplus:
-			mnt->flags |= NFS_MOUNT_NORDIRPLUS;
-			break;
-		case Opt_sharecache:
-			mnt->flags &= ~NFS_MOUNT_UNSHARED;
-			break;
-		case Opt_nosharecache:
-			mnt->flags |= NFS_MOUNT_UNSHARED;
-			break;
-		case Opt_resvport:
-			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
-			break;
-		case Opt_noresvport:
-			mnt->flags |= NFS_MOUNT_NORESVPORT;
-			break;
-		case Opt_fscache:
-			mnt->options |= NFS_OPTION_FSCACHE;
-			kfree(mnt->fscache_uniq);
-			mnt->fscache_uniq = NULL;
-			break;
-		case Opt_nofscache:
-			mnt->options &= ~NFS_OPTION_FSCACHE;
-			kfree(mnt->fscache_uniq);
-			mnt->fscache_uniq = NULL;
-			break;
-		case Opt_migration:
-			mnt->options |= NFS_OPTION_MIGRATION;
-			break;
-		case Opt_nomigration:
-			mnt->options &= ~NFS_OPTION_MIGRATION;
-			break;
-
-		/*
-		 * options that take numeric values
-		 */
-		case Opt_port:
-			if (nfs_get_option_ul(args, &option) ||
-			    option > USHRT_MAX)
-				goto out_invalid_value;
-			mnt->nfs_server.port = option;
-			break;
-		case Opt_rsize:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->rsize = option;
-			break;
-		case Opt_wsize:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->wsize = option;
-			break;
-		case Opt_bsize:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->bsize = option;
-			break;
-		case Opt_timeo:
-			if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
-				goto out_invalid_value;
-			mnt->timeo = option;
-			break;
-		case Opt_retrans:
-			if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
-				goto out_invalid_value;
-			mnt->retrans = option;
-			break;
-		case Opt_acregmin:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->acregmin = option;
-			break;
-		case Opt_acregmax:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->acregmax = option;
-			break;
-		case Opt_acdirmin:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->acdirmin = option;
-			break;
-		case Opt_acdirmax:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->acdirmax = option;
-			break;
-		case Opt_actimeo:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->acregmin = mnt->acregmax =
-			mnt->acdirmin = mnt->acdirmax = option;
-			break;
-		case Opt_namelen:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			mnt->namlen = option;
-			break;
-		case Opt_mountport:
-			if (nfs_get_option_ul(args, &option) ||
-			    option > USHRT_MAX)
-				goto out_invalid_value;
-			mnt->mount_server.port = option;
-			break;
-		case Opt_mountvers:
-			if (nfs_get_option_ul(args, &option) ||
-			    option < NFS_MNT_VERSION ||
-			    option > NFS_MNT3_VERSION)
-				goto out_invalid_value;
-			mnt->mount_server.version = option;
-			break;
-		case Opt_minorversion:
-			if (nfs_get_option_ul(args, &option))
-				goto out_invalid_value;
-			if (option > NFS4_MAX_MINOR_VERSION)
-				goto out_invalid_value;
-			mnt->minorversion = option;
-			break;
-
-		/*
-		 * options that take text values
-		 */
-		case Opt_nfsvers:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			rc = nfs_parse_version_string(string, mnt, args);
-			kfree(string);
-			if (!rc)
-				goto out_invalid_value;
-			break;
-		case Opt_sec:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			rc = nfs_parse_security_flavors(string, mnt);
-			kfree(string);
-			if (!rc) {
-				dfprintk(MOUNT, "NFS:   unrecognized "
-						"security flavor\n");
-				return 0;
-			}
-			break;
-		case Opt_proto:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			token = match_token(string,
-					    nfs_xprt_protocol_tokens, args);
-
-			protofamily = AF_INET;
-			switch (token) {
-			case Opt_xprt_udp6:
-				protofamily = AF_INET6;
-				/* fall through */
-			case Opt_xprt_udp:
-				mnt->flags &= ~NFS_MOUNT_TCP;
-				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
-				break;
-			case Opt_xprt_tcp6:
-				protofamily = AF_INET6;
-				/* fall through */
-			case Opt_xprt_tcp:
-				mnt->flags |= NFS_MOUNT_TCP;
-				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
-				break;
-			case Opt_xprt_rdma6:
-				protofamily = AF_INET6;
-				/* fall through */
-			case Opt_xprt_rdma:
-				/* vector side protocols to TCP */
-				mnt->flags |= NFS_MOUNT_TCP;
-				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
-				xprt_load_transport(string);
-				break;
-			default:
-				dfprintk(MOUNT, "NFS:   unrecognized "
-						"transport protocol\n");
-				kfree(string);
-				return 0;
-			}
-			kfree(string);
-			break;
-		case Opt_mountproto:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			token = match_token(string,
-					    nfs_xprt_protocol_tokens, args);
-			kfree(string);
-
-			mountfamily = AF_INET;
-			switch (token) {
-			case Opt_xprt_udp6:
-				mountfamily = AF_INET6;
-				/* fall through */
-			case Opt_xprt_udp:
-				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
-				break;
-			case Opt_xprt_tcp6:
-				mountfamily = AF_INET6;
-				/* fall through */
-			case Opt_xprt_tcp:
-				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
-				break;
-			case Opt_xprt_rdma: /* not used for side protocols */
-			default:
-				dfprintk(MOUNT, "NFS:   unrecognized "
-						"transport protocol\n");
-				return 0;
-			}
-			break;
-		case Opt_addr:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			mnt->nfs_server.addrlen =
-				rpc_pton(mnt->net, string, strlen(string),
-					(struct sockaddr *)
-					&mnt->nfs_server.address,
-					sizeof(mnt->nfs_server.address));
-			kfree(string);
-			if (mnt->nfs_server.addrlen == 0)
-				goto out_invalid_address;
-			break;
-		case Opt_clientaddr:
-			if (nfs_get_option_str(args, &mnt->client_address))
-				goto out_nomem;
-			break;
-		case Opt_mounthost:
-			if (nfs_get_option_str(args,
-					       &mnt->mount_server.hostname))
-				goto out_nomem;
-			break;
-		case Opt_mountaddr:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			mnt->mount_server.addrlen =
-				rpc_pton(mnt->net, string, strlen(string),
-					(struct sockaddr *)
-					&mnt->mount_server.address,
-					sizeof(mnt->mount_server.address));
-			kfree(string);
-			if (mnt->mount_server.addrlen == 0)
-				goto out_invalid_address;
-			break;
-		case Opt_nconnect:
-			if (nfs_get_option_ul_bound(args, &option, 1, NFS_MAX_CONNECTIONS))
-				goto out_invalid_value;
-			mnt->nfs_server.nconnect = option;
-			break;
-		case Opt_lookupcache:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			token = match_token(string,
-					nfs_lookupcache_tokens, args);
-			kfree(string);
-			switch (token) {
-				case Opt_lookupcache_all:
-					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
-					break;
-				case Opt_lookupcache_positive:
-					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
-					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
-					break;
-				case Opt_lookupcache_none:
-					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
-					break;
-				default:
-					dfprintk(MOUNT, "NFS:   invalid "
-							"lookupcache argument\n");
-					return 0;
-			}
-			break;
-		case Opt_fscache_uniq:
-			if (nfs_get_option_str(args, &mnt->fscache_uniq))
-				goto out_nomem;
-			mnt->options |= NFS_OPTION_FSCACHE;
-			break;
-		case Opt_local_lock:
-			string = match_strdup(args);
-			if (string == NULL)
-				goto out_nomem;
-			token = match_token(string, nfs_local_lock_tokens,
-					args);
-			kfree(string);
-			switch (token) {
-			case Opt_local_lock_all:
-				mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
-					       NFS_MOUNT_LOCAL_FCNTL);
-				break;
-			case Opt_local_lock_flock:
-				mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
-				break;
-			case Opt_local_lock_posix:
-				mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
-				break;
-			case Opt_local_lock_none:
-				mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
-						NFS_MOUNT_LOCAL_FCNTL);
-				break;
-			default:
-				dfprintk(MOUNT, "NFS:	invalid	"
-						"local_lock argument\n");
-				return 0;
-			}
-			break;
-
-		/*
-		 * Special options
-		 */
-		case Opt_sloppy:
-			sloppy = 1;
-			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
-			break;
-		case Opt_userspace:
-		case Opt_deprecated:
-			dfprintk(MOUNT, "NFS:   ignoring mount option "
-					"'%s'\n", p);
-			break;
-
-		default:
-			invalid_option = 1;
-			dfprintk(MOUNT, "NFS:   unrecognized mount option "
-					"'%s'\n", p);
-		}
-	}
-
-	if (!sloppy && invalid_option)
-		return 0;
-
-	if (mnt->minorversion && mnt->version != 4)
-		goto out_minorversion_mismatch;
-
-	if (mnt->options & NFS_OPTION_MIGRATION &&
-	    (mnt->version != 4 || mnt->minorversion != 0))
-		goto out_migration_misuse;
-
-	/*
-	 * verify that any proto=/mountproto= options match the address
-	 * families in the addr=/mountaddr= options.
-	 */
-	if (protofamily != AF_UNSPEC &&
-	    protofamily != mnt->nfs_server.address.ss_family)
-		goto out_proto_mismatch;
-
-	if (mountfamily != AF_UNSPEC) {
-		if (mnt->mount_server.addrlen) {
-			if (mountfamily != mnt->mount_server.address.ss_family)
-				goto out_mountproto_mismatch;
-		} else {
-			if (mountfamily != mnt->nfs_server.address.ss_family)
-				goto out_mountproto_mismatch;
-		}
-	}
-
-	return 1;
-
-out_mountproto_mismatch:
-	printk(KERN_INFO "NFS: mount server address does not match mountproto= "
-			 "option\n");
-	return 0;
-out_proto_mismatch:
-	printk(KERN_INFO "NFS: server address does not match proto= option\n");
-	return 0;
-out_invalid_address:
-	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
-	return 0;
-out_invalid_value:
-	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
-	return 0;
-out_minorversion_mismatch:
-	printk(KERN_INFO "NFS: mount option vers=%u does not support "
-			 "minorversion=%u\n", mnt->version, mnt->minorversion);
-	return 0;
-out_migration_misuse:
-	printk(KERN_INFO
-		"NFS: 'migration' not supported for this NFS version\n");
-	return 0;
-out_nomem:
-	printk(KERN_INFO "NFS: not enough memory to parse option\n");
-	return 0;
-out_security_failure:
-	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
-	return 0;
-}
-
-/*
  * Ensure that a specified authtype in args->auth_info is supported by
  * the server. Returns 0 and sets args->selected_flavor if it's ok, and
  * -EACCES if not.
@@ -1908,327 +925,6 @@ struct dentry *nfs_try_mount(int flags, const char *dev_name,
 }
 EXPORT_SYMBOL_GPL(nfs_try_mount);
 
-/*
- * Split "dev_name" into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path.  If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
-static int nfs_parse_devname(const char *dev_name,
-			     char **hostname, size_t maxnamlen,
-			     char **export_path, size_t maxpathlen)
-{
-	size_t len;
-	char *end;
-
-	if (unlikely(!dev_name || !*dev_name)) {
-		dfprintk(MOUNT, "NFS: device name not specified\n");
-		return -EINVAL;
-	}
-
-	/* Is the host name protected with square brakcets? */
-	if (*dev_name == '[') {
-		end = strchr(++dev_name, ']');
-		if (end == NULL || end[1] != ':')
-			goto out_bad_devname;
-
-		len = end - dev_name;
-		end++;
-	} else {
-		char *comma;
-
-		end = strchr(dev_name, ':');
-		if (end == NULL)
-			goto out_bad_devname;
-		len = end - dev_name;
-
-		/* kill possible hostname list: not supported */
-		comma = strchr(dev_name, ',');
-		if (comma != NULL && comma < end)
-			len = comma - dev_name;
-	}
-
-	if (len > maxnamlen)
-		goto out_hostname;
-
-	/* N.B. caller will free nfs_server.hostname in all cases */
-	*hostname = kstrndup(dev_name, len, GFP_KERNEL);
-	if (*hostname == NULL)
-		goto out_nomem;
-	len = strlen(++end);
-	if (len > maxpathlen)
-		goto out_path;
-	*export_path = kstrndup(end, len, GFP_KERNEL);
-	if (!*export_path)
-		goto out_nomem;
-
-	dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
-	return 0;
-
-out_bad_devname:
-	dfprintk(MOUNT, "NFS: device name not in host:path format\n");
-	return -EINVAL;
-
-out_nomem:
-	dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
-	return -ENOMEM;
-
-out_hostname:
-	dfprintk(MOUNT, "NFS: server hostname too long\n");
-	return -ENAMETOOLONG;
-
-out_path:
-	dfprintk(MOUNT, "NFS: export pathname too long\n");
-	return -ENAMETOOLONG;
-}
-
-/*
- * Validate the NFS2/NFS3 mount data
- * - fills in the mount root filehandle
- *
- * For option strings, user space handles the following behaviors:
- *
- * + DNS: mapping server host name to IP address ("addr=" option)
- *
- * + failure mode: how to behave if a mount request can't be handled
- *   immediately ("fg/bg" option)
- *
- * + retry: how often to retry a mount request ("retry=" option)
- *
- * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
- *   mountproto=tcp after mountproto=udp, and so on
- */
-static int nfs23_validate_mount_data(void *options,
-				     struct nfs_parsed_mount_data *args,
-				     struct nfs_fh *mntfh,
-				     const char *dev_name)
-{
-	struct nfs_mount_data *data = (struct nfs_mount_data *)options;
-	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
-	int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
-
-	if (data == NULL)
-		goto out_no_data;
-
-	args->version = NFS_DEFAULT_VERSION;
-	switch (data->version) {
-	case 1:
-		data->namlen = 0; /* fall through */
-	case 2:
-		data->bsize = 0; /* fall through */
-	case 3:
-		if (data->flags & NFS_MOUNT_VER3)
-			goto out_no_v3;
-		data->root.size = NFS2_FHSIZE;
-		memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
-		/* Turn off security negotiation */
-		extra_flags |= NFS_MOUNT_SECFLAVOUR;
-		/* fall through */
-	case 4:
-		if (data->flags & NFS_MOUNT_SECFLAVOUR)
-			goto out_no_sec;
-		/* fall through */
-	case 5:
-		memset(data->context, 0, sizeof(data->context));
-		/* fall through */
-	case 6:
-		if (data->flags & NFS_MOUNT_VER3) {
-			if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
-				goto out_invalid_fh;
-			mntfh->size = data->root.size;
-			args->version = 3;
-		} else {
-			mntfh->size = NFS2_FHSIZE;
-			args->version = 2;
-		}
-
-
-		memcpy(mntfh->data, data->root.data, mntfh->size);
-		if (mntfh->size < sizeof(mntfh->data))
-			memset(mntfh->data + mntfh->size, 0,
-			       sizeof(mntfh->data) - mntfh->size);
-
-		/*
-		 * Translate to nfs_parsed_mount_data, which nfs_fill_super
-		 * can deal with.
-		 */
-		args->flags		= data->flags & NFS_MOUNT_FLAGMASK;
-		args->flags		|= extra_flags;
-		args->rsize		= data->rsize;
-		args->wsize		= data->wsize;
-		args->timeo		= data->timeo;
-		args->retrans		= data->retrans;
-		args->acregmin		= data->acregmin;
-		args->acregmax		= data->acregmax;
-		args->acdirmin		= data->acdirmin;
-		args->acdirmax		= data->acdirmax;
-		args->need_mount	= false;
-
-		memcpy(sap, &data->addr, sizeof(data->addr));
-		args->nfs_server.addrlen = sizeof(data->addr);
-		args->nfs_server.port = ntohs(data->addr.sin_port);
-		if (sap->sa_family != AF_INET ||
-		    !nfs_verify_server_address(sap))
-			goto out_no_address;
-
-		if (!(data->flags & NFS_MOUNT_TCP))
-			args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
-		/* N.B. caller will free nfs_server.hostname in all cases */
-		args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
-		args->namlen		= data->namlen;
-		args->bsize		= data->bsize;
-
-		if (data->flags & NFS_MOUNT_SECFLAVOUR)
-			args->selected_flavor = data->pseudoflavor;
-		else
-			args->selected_flavor = RPC_AUTH_UNIX;
-		if (!args->nfs_server.hostname)
-			goto out_nomem;
-
-		if (!(data->flags & NFS_MOUNT_NONLM))
-			args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
-					 NFS_MOUNT_LOCAL_FCNTL);
-		else
-			args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
-					NFS_MOUNT_LOCAL_FCNTL);
-		/*
-		 * The legacy version 6 binary mount data from userspace has a
-		 * field used only to transport selinux information into the
-		 * the kernel.  To continue to support that functionality we
-		 * have a touch of selinux knowledge here in the NFS code. The
-		 * userspace code converted context=blah to just blah so we are
-		 * converting back to the full string selinux understands.
-		 */
-		if (data->context[0]){
-#ifdef CONFIG_SECURITY_SELINUX
-			int rc;
-			data->context[NFS_MAX_CONTEXT_LEN] = '\0';
-			rc = security_add_mnt_opt("context", data->context,
-					strlen(data->context), &args->lsm_opts);
-			if (rc)
-				return rc;
-#else
-			return -EINVAL;
-#endif
-		}
-
-		break;
-	default:
-		return NFS_TEXT_DATA;
-	}
-
-	return 0;
-
-out_no_data:
-	dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
-	return -EINVAL;
-
-out_no_v3:
-	dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
-		 data->version);
-	return -EINVAL;
-
-out_no_sec:
-	dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
-	return -EINVAL;
-
-out_nomem:
-	dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
-	return -ENOMEM;
-
-out_no_address:
-	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
-	return -EINVAL;
-
-out_invalid_fh:
-	dfprintk(MOUNT, "NFS: invalid root filehandle\n");
-	return -EINVAL;
-}
-
-#if IS_ENABLED(CONFIG_NFS_V4)
-static int nfs_validate_mount_data(struct file_system_type *fs_type,
-				   void *options,
-				   struct nfs_parsed_mount_data *args,
-				   struct nfs_fh *mntfh,
-				   const char *dev_name)
-{
-	if (fs_type == &nfs_fs_type)
-		return nfs23_validate_mount_data(options, args, mntfh, dev_name);
-	return nfs4_validate_mount_data(options, args, dev_name);
-}
-#else
-static int nfs_validate_mount_data(struct file_system_type *fs_type,
-				   void *options,
-				   struct nfs_parsed_mount_data *args,
-				   struct nfs_fh *mntfh,
-				   const char *dev_name)
-{
-	return nfs23_validate_mount_data(options, args, mntfh, dev_name);
-}
-#endif
-
-static int nfs_validate_text_mount_data(void *options,
-					struct nfs_parsed_mount_data *args,
-					const char *dev_name)
-{
-	int port = 0;
-	int max_namelen = PAGE_SIZE;
-	int max_pathlen = NFS_MAXPATHLEN;
-	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
-
-	if (nfs_parse_mount_options((char *)options, args) == 0)
-		return -EINVAL;
-
-	if (!nfs_verify_server_address(sap))
-		goto out_no_address;
-
-	if (args->version == 4) {
-#if IS_ENABLED(CONFIG_NFS_V4)
-		if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
-			port = NFS_RDMA_PORT;
-		else
-			port = NFS_PORT;
-		max_namelen = NFS4_MAXNAMLEN;
-		max_pathlen = NFS4_MAXPATHLEN;
-		nfs_validate_transport_protocol(args);
-		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
-			goto out_invalid_transport_udp;
-		nfs4_validate_mount_flags(args);
-#else
-		goto out_v4_not_compiled;
-#endif /* CONFIG_NFS_V4 */
-	} else {
-		nfs_set_mount_transport_protocol(args);
-		if (args->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
-			port = NFS_RDMA_PORT;
-	}
-
-	nfs_set_port(sap, &args->nfs_server.port, port);
-
-	return nfs_parse_devname(dev_name,
-				   &args->nfs_server.hostname,
-				   max_namelen,
-				   &args->nfs_server.export_path,
-				   max_pathlen);
-
-#if !IS_ENABLED(CONFIG_NFS_V4)
-out_v4_not_compiled:
-	dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
-	return -EPROTONOSUPPORT;
-#else
-out_invalid_transport_udp:
-	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
-	return -EINVAL;
-#endif /* !CONFIG_NFS_V4 */
-
-out_no_address:
-	dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
-	return -EINVAL;
-}
-
 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
 		| NFS_MOUNT_SECURE \
 		| NFS_MOUNT_TCP \
@@ -2735,113 +1431,6 @@ nfs_prepared_mount(struct file_system_type *fs_type, int flags,
 
 #if IS_ENABLED(CONFIG_NFS_V4)
 
-static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
-{
-	args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
-			 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
-}
-
-/*
- * Validate NFSv4 mount options
- */
-static int nfs4_validate_mount_data(void *options,
-				    struct nfs_parsed_mount_data *args,
-				    const char *dev_name)
-{
-	struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
-	struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
-	char *c;
-
-	if (data == NULL)
-		goto out_no_data;
-
-	args->version = 4;
-
-	switch (data->version) {
-	case 1:
-		if (data->host_addrlen > sizeof(args->nfs_server.address))
-			goto out_no_address;
-		if (data->host_addrlen == 0)
-			goto out_no_address;
-		args->nfs_server.addrlen = data->host_addrlen;
-		if (copy_from_user(sap, data->host_addr, data->host_addrlen))
-			return -EFAULT;
-		if (!nfs_verify_server_address(sap))
-			goto out_no_address;
-		args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
-
-		if (data->auth_flavourlen) {
-			rpc_authflavor_t pseudoflavor;
-			if (data->auth_flavourlen > 1)
-				goto out_inval_auth;
-			if (copy_from_user(&pseudoflavor,
-					   data->auth_flavours,
-					   sizeof(pseudoflavor)))
-				return -EFAULT;
-			args->selected_flavor = pseudoflavor;
-		} else
-			args->selected_flavor = RPC_AUTH_UNIX;
-
-		c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
-		if (IS_ERR(c))
-			return PTR_ERR(c);
-		args->nfs_server.hostname = c;
-
-		c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
-		if (IS_ERR(c))
-			return PTR_ERR(c);
-		args->nfs_server.export_path = c;
-		dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
-
-		c = strndup_user(data->client_addr.data, 16);
-		if (IS_ERR(c))
-			return PTR_ERR(c);
-		args->client_address = c;
-
-		/*
-		 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
-		 * can deal with.
-		 */
-
-		args->flags	= data->flags & NFS4_MOUNT_FLAGMASK;
-		args->rsize	= data->rsize;
-		args->wsize	= data->wsize;
-		args->timeo	= data->timeo;
-		args->retrans	= data->retrans;
-		args->acregmin	= data->acregmin;
-		args->acregmax	= data->acregmax;
-		args->acdirmin	= data->acdirmin;
-		args->acdirmax	= data->acdirmax;
-		args->nfs_server.protocol = data->proto;
-		nfs_validate_transport_protocol(args);
-		if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
-			goto out_invalid_transport_udp;
-
-		break;
-	default:
-		return NFS_TEXT_DATA;
-	}
-
-	return 0;
-
-out_no_data:
-	dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
-	return -EINVAL;
-
-out_inval_auth:
-	dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
-		 data->auth_flavourlen);
-	return -EINVAL;
-
-out_no_address:
-	dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
-	return -EINVAL;
-
-out_invalid_transport_udp:
-	dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
-	return -EINVAL;
-}
-
 /*
  * NFS v4 module parameters need to stay in the
  * NFS client for backwards compatibility