1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/nfs/fs_context.c
5 * Copyright (C) 1992 Rick Sladkey
6 * Conversion to new mount api Copyright (C) David Howells
10 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
13 #include <linux/module.h>
15 #include <linux/fs_context.h>
16 #include <linux/fs_parser.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_mount.h>
19 #include <linux/nfs4_mount.h>
23 #define NFSDBG_FACILITY NFSDBG_MOUNT
25 #if IS_ENABLED(CONFIG_NFS_V3)
26 #define NFS_DEFAULT_VERSION 3
28 #define NFS_DEFAULT_VERSION 2
31 #define NFS_MAX_CONNECTIONS 16
96 static const struct constant_table nfs_param_enums_local_lock
[] = {
97 { "all", Opt_local_lock_all
},
98 { "flock", Opt_local_lock_flock
},
99 { "posix", Opt_local_lock_posix
},
100 { "none", Opt_local_lock_none
},
106 Opt_lookupcache_none
,
107 Opt_lookupcache_positive
,
110 static const struct constant_table nfs_param_enums_lookupcache
[] = {
111 { "all", Opt_lookupcache_all
},
112 { "none", Opt_lookupcache_none
},
113 { "pos", Opt_lookupcache_positive
},
114 { "positive", Opt_lookupcache_positive
},
124 static const struct constant_table nfs_param_enums_write
[] = {
125 { "lazy", Opt_write_lazy
},
126 { "eager", Opt_write_eager
},
127 { "wait", Opt_write_wait
},
131 static const struct fs_parameter_spec nfs_fs_parameters
[] = {
132 fsparam_flag_no("ac", Opt_ac
),
133 fsparam_u32 ("acdirmax", Opt_acdirmax
),
134 fsparam_u32 ("acdirmin", Opt_acdirmin
),
135 fsparam_flag_no("acl", Opt_acl
),
136 fsparam_u32 ("acregmax", Opt_acregmax
),
137 fsparam_u32 ("acregmin", Opt_acregmin
),
138 fsparam_u32 ("actimeo", Opt_actimeo
),
139 fsparam_string("addr", Opt_addr
),
140 fsparam_flag ("bg", Opt_bg
),
141 fsparam_u32 ("bsize", Opt_bsize
),
142 fsparam_string("clientaddr", Opt_clientaddr
),
143 fsparam_flag_no("cto", Opt_cto
),
144 fsparam_flag ("fg", Opt_fg
),
145 fsparam_flag_no("fsc", Opt_fscache_flag
),
146 fsparam_string("fsc", Opt_fscache
),
147 fsparam_flag ("hard", Opt_hard
),
148 __fsparam(NULL
, "intr", Opt_intr
,
149 fs_param_neg_with_no
|fs_param_deprecated
, NULL
),
150 fsparam_enum ("local_lock", Opt_local_lock
, nfs_param_enums_local_lock
),
151 fsparam_flag_no("lock", Opt_lock
),
152 fsparam_enum ("lookupcache", Opt_lookupcache
, nfs_param_enums_lookupcache
),
153 fsparam_flag_no("migration", Opt_migration
),
154 fsparam_u32 ("minorversion", Opt_minorversion
),
155 fsparam_string("mountaddr", Opt_mountaddr
),
156 fsparam_string("mounthost", Opt_mounthost
),
157 fsparam_u32 ("mountport", Opt_mountport
),
158 fsparam_string("mountproto", Opt_mountproto
),
159 fsparam_u32 ("mountvers", Opt_mountvers
),
160 fsparam_u32 ("namlen", Opt_namelen
),
161 fsparam_u32 ("nconnect", Opt_nconnect
),
162 fsparam_u32 ("max_connect", Opt_max_connect
),
163 fsparam_string("nfsvers", Opt_vers
),
164 fsparam_u32 ("port", Opt_port
),
165 fsparam_flag_no("posix", Opt_posix
),
166 fsparam_string("proto", Opt_proto
),
167 fsparam_flag_no("rdirplus", Opt_rdirplus
),
168 fsparam_flag ("rdma", Opt_rdma
),
169 fsparam_flag_no("resvport", Opt_resvport
),
170 fsparam_u32 ("retrans", Opt_retrans
),
171 fsparam_string("retry", Opt_retry
),
172 fsparam_u32 ("rsize", Opt_rsize
),
173 fsparam_string("sec", Opt_sec
),
174 fsparam_flag_no("sharecache", Opt_sharecache
),
175 fsparam_flag ("sloppy", Opt_sloppy
),
176 fsparam_flag ("soft", Opt_soft
),
177 fsparam_flag ("softerr", Opt_softerr
),
178 fsparam_flag ("softreval", Opt_softreval
),
179 fsparam_string("source", Opt_source
),
180 fsparam_flag ("tcp", Opt_tcp
),
181 fsparam_u32 ("timeo", Opt_timeo
),
182 fsparam_flag ("udp", Opt_udp
),
183 fsparam_flag ("v2", Opt_v
),
184 fsparam_flag ("v3", Opt_v
),
185 fsparam_flag ("v4", Opt_v
),
186 fsparam_flag ("v4.0", Opt_v
),
187 fsparam_flag ("v4.1", Opt_v
),
188 fsparam_flag ("v4.2", Opt_v
),
189 fsparam_string("vers", Opt_vers
),
190 fsparam_enum ("write", Opt_write
, nfs_param_enums_write
),
191 fsparam_u32 ("wsize", Opt_wsize
),
204 static const struct constant_table nfs_vers_tokens
[] = {
208 { "4.0", Opt_vers_4_0
},
209 { "4.1", Opt_vers_4_1
},
210 { "4.2", Opt_vers_4_2
},
224 static const struct constant_table nfs_xprt_protocol_tokens
[] = {
225 { "rdma", Opt_xprt_rdma
},
226 { "rdma6", Opt_xprt_rdma6
},
227 { "tcp", Opt_xprt_tcp
},
228 { "tcp6", Opt_xprt_tcp6
},
229 { "udp", Opt_xprt_udp
},
230 { "udp6", Opt_xprt_udp6
},
249 static const struct constant_table nfs_secflavor_tokens
[] = {
250 { "krb5", Opt_sec_krb5
},
251 { "krb5i", Opt_sec_krb5i
},
252 { "krb5p", Opt_sec_krb5p
},
253 { "lkey", Opt_sec_lkey
},
254 { "lkeyi", Opt_sec_lkeyi
},
255 { "lkeyp", Opt_sec_lkeyp
},
256 { "none", Opt_sec_none
},
257 { "null", Opt_sec_none
},
258 { "spkm3", Opt_sec_spkm
},
259 { "spkm3i", Opt_sec_spkmi
},
260 { "spkm3p", Opt_sec_spkmp
},
261 { "sys", Opt_sec_sys
},
266 * Sanity-check a server address provided by the mount command.
268 * Address family must be initialized, and address must not be
269 * the ANY address for that family.
271 static int nfs_verify_server_address(struct sockaddr
*addr
)
273 switch (addr
->sa_family
) {
275 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
276 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
279 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
280 return !ipv6_addr_any(sa
);
284 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
288 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
289 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context
*ctx
)
294 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context
*ctx
)
296 if (ctx
->version
== 4)
303 * Sanity check the NFS transport protocol.
305 static int nfs_validate_transport_protocol(struct fs_context
*fc
,
306 struct nfs_fs_context
*ctx
)
308 switch (ctx
->nfs_server
.protocol
) {
309 case XPRT_TRANSPORT_UDP
:
310 if (nfs_server_transport_udp_invalid(ctx
))
311 goto out_invalid_transport_udp
;
313 case XPRT_TRANSPORT_TCP
:
314 case XPRT_TRANSPORT_RDMA
:
317 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
320 out_invalid_transport_udp
:
321 return nfs_invalf(fc
, "NFS: Unsupported transport protocol udp");
325 * For text based NFSv2/v3 mounts, the mount protocol transport default
326 * settings should depend upon the specified NFS transport.
328 static void nfs_set_mount_transport_protocol(struct nfs_fs_context
*ctx
)
330 if (ctx
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
331 ctx
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
333 switch (ctx
->nfs_server
.protocol
) {
334 case XPRT_TRANSPORT_UDP
:
335 ctx
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
337 case XPRT_TRANSPORT_TCP
:
338 case XPRT_TRANSPORT_RDMA
:
339 ctx
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
344 * Add 'flavor' to 'auth_info' if not already present.
345 * Returns true if 'flavor' ends up in the list, false otherwise
347 static int nfs_auth_info_add(struct fs_context
*fc
,
348 struct nfs_auth_info
*auth_info
,
349 rpc_authflavor_t flavor
)
352 unsigned int max_flavor_len
= ARRAY_SIZE(auth_info
->flavors
);
354 /* make sure this flavor isn't already in the list */
355 for (i
= 0; i
< auth_info
->flavor_len
; i
++) {
356 if (flavor
== auth_info
->flavors
[i
])
360 if (auth_info
->flavor_len
+ 1 >= max_flavor_len
)
361 return nfs_invalf(fc
, "NFS: too many sec= flavors");
363 auth_info
->flavors
[auth_info
->flavor_len
++] = flavor
;
368 * Parse the value of the 'sec=' option.
370 static int nfs_parse_security_flavors(struct fs_context
*fc
,
371 struct fs_parameter
*param
)
373 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
374 rpc_authflavor_t pseudoflavor
;
375 char *string
= param
->string
, *p
;
378 dfprintk(MOUNT
, "NFS: parsing %s=%s option\n", param
->key
, param
->string
);
380 while ((p
= strsep(&string
, ":")) != NULL
) {
383 switch (lookup_constant(nfs_secflavor_tokens
, p
, -1)) {
385 pseudoflavor
= RPC_AUTH_NULL
;
388 pseudoflavor
= RPC_AUTH_UNIX
;
391 pseudoflavor
= RPC_AUTH_GSS_KRB5
;
394 pseudoflavor
= RPC_AUTH_GSS_KRB5I
;
397 pseudoflavor
= RPC_AUTH_GSS_KRB5P
;
400 pseudoflavor
= RPC_AUTH_GSS_LKEY
;
403 pseudoflavor
= RPC_AUTH_GSS_LKEYI
;
406 pseudoflavor
= RPC_AUTH_GSS_LKEYP
;
409 pseudoflavor
= RPC_AUTH_GSS_SPKM
;
412 pseudoflavor
= RPC_AUTH_GSS_SPKMI
;
415 pseudoflavor
= RPC_AUTH_GSS_SPKMP
;
418 return nfs_invalf(fc
, "NFS: sec=%s option not recognized", p
);
421 ret
= nfs_auth_info_add(fc
, &ctx
->auth_info
, pseudoflavor
);
429 static int nfs_parse_version_string(struct fs_context
*fc
,
432 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
434 ctx
->flags
&= ~NFS_MOUNT_VER3
;
435 switch (lookup_constant(nfs_vers_tokens
, string
, -1)) {
440 ctx
->flags
|= NFS_MOUNT_VER3
;
444 /* Backward compatibility option. In future,
445 * the mount program should always supply
446 * a NFSv4 minor version number.
452 ctx
->minorversion
= 0;
456 ctx
->minorversion
= 1;
460 ctx
->minorversion
= 2;
463 return nfs_invalf(fc
, "NFS: Unsupported NFS version");
469 * Parse a single mount parameter.
471 static int nfs_fs_context_parse_param(struct fs_context
*fc
,
472 struct fs_parameter
*param
)
474 struct fs_parse_result result
;
475 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
476 unsigned short protofamily
, mountfamily
;
480 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", param
->key
);
482 opt
= fs_parse(fc
, nfs_fs_parameters
, param
, &result
);
484 return ctx
->sloppy
? 1 : opt
;
487 ctx
->has_sec_mnt_opts
= 1;
492 return nfs_invalf(fc
, "NFS: Multiple sources not supported");
493 fc
->source
= param
->string
;
494 param
->string
= NULL
;
498 * boolean options: foo/nofoo
501 ctx
->flags
|= NFS_MOUNT_SOFT
;
502 ctx
->flags
&= ~NFS_MOUNT_SOFTERR
;
505 ctx
->flags
|= NFS_MOUNT_SOFTERR
| NFS_MOUNT_SOFTREVAL
;
506 ctx
->flags
&= ~NFS_MOUNT_SOFT
;
509 ctx
->flags
&= ~(NFS_MOUNT_SOFT
|
511 NFS_MOUNT_SOFTREVAL
);
515 ctx
->flags
&= ~NFS_MOUNT_SOFTREVAL
;
517 ctx
->flags
&= NFS_MOUNT_SOFTREVAL
;
521 ctx
->flags
&= ~NFS_MOUNT_POSIX
;
523 ctx
->flags
|= NFS_MOUNT_POSIX
;
527 ctx
->flags
|= NFS_MOUNT_NOCTO
;
529 ctx
->flags
&= ~NFS_MOUNT_NOCTO
;
533 ctx
->flags
|= NFS_MOUNT_NOAC
;
535 ctx
->flags
&= ~NFS_MOUNT_NOAC
;
538 if (result
.negated
) {
539 ctx
->flags
|= NFS_MOUNT_NONLM
;
540 ctx
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
| NFS_MOUNT_LOCAL_FCNTL
);
542 ctx
->flags
&= ~NFS_MOUNT_NONLM
;
543 ctx
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
| NFS_MOUNT_LOCAL_FCNTL
);
547 ctx
->flags
&= ~NFS_MOUNT_TCP
;
548 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
552 ctx
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
553 ret
= xprt_find_transport_ident(param
->key
);
555 goto out_bad_transport
;
556 ctx
->nfs_server
.protocol
= ret
;
560 ctx
->flags
|= NFS_MOUNT_NOACL
;
562 ctx
->flags
&= ~NFS_MOUNT_NOACL
;
566 ctx
->flags
|= NFS_MOUNT_NORDIRPLUS
;
568 ctx
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
572 ctx
->flags
|= NFS_MOUNT_UNSHARED
;
574 ctx
->flags
&= ~NFS_MOUNT_UNSHARED
;
578 ctx
->flags
|= NFS_MOUNT_NORESVPORT
;
580 ctx
->flags
&= ~NFS_MOUNT_NORESVPORT
;
582 case Opt_fscache_flag
:
584 ctx
->options
&= ~NFS_OPTION_FSCACHE
;
586 ctx
->options
|= NFS_OPTION_FSCACHE
;
587 kfree(ctx
->fscache_uniq
);
588 ctx
->fscache_uniq
= NULL
;
591 ctx
->options
|= NFS_OPTION_FSCACHE
;
592 kfree(ctx
->fscache_uniq
);
593 ctx
->fscache_uniq
= param
->string
;
594 param
->string
= NULL
;
598 ctx
->options
&= ~NFS_OPTION_MIGRATION
;
600 ctx
->options
|= NFS_OPTION_MIGRATION
;
604 * options that take numeric values
607 if (result
.uint_32
> USHRT_MAX
)
609 ctx
->nfs_server
.port
= result
.uint_32
;
612 ctx
->rsize
= result
.uint_32
;
615 ctx
->wsize
= result
.uint_32
;
618 ctx
->bsize
= result
.uint_32
;
621 if (result
.uint_32
< 1 || result
.uint_32
> INT_MAX
)
623 ctx
->timeo
= result
.uint_32
;
626 if (result
.uint_32
> INT_MAX
)
628 ctx
->retrans
= result
.uint_32
;
631 ctx
->acregmin
= result
.uint_32
;
634 ctx
->acregmax
= result
.uint_32
;
637 ctx
->acdirmin
= result
.uint_32
;
640 ctx
->acdirmax
= result
.uint_32
;
643 ctx
->acregmin
= result
.uint_32
;
644 ctx
->acregmax
= result
.uint_32
;
645 ctx
->acdirmin
= result
.uint_32
;
646 ctx
->acdirmax
= result
.uint_32
;
649 ctx
->namlen
= result
.uint_32
;
652 if (result
.uint_32
> USHRT_MAX
)
654 ctx
->mount_server
.port
= result
.uint_32
;
657 if (result
.uint_32
< NFS_MNT_VERSION
||
658 result
.uint_32
> NFS_MNT3_VERSION
)
660 ctx
->mount_server
.version
= result
.uint_32
;
662 case Opt_minorversion
:
663 if (result
.uint_32
> NFS4_MAX_MINOR_VERSION
)
665 ctx
->minorversion
= result
.uint_32
;
669 * options that take text values
672 ret
= nfs_parse_version_string(fc
, param
->key
+ 1);
677 ret
= nfs_parse_version_string(fc
, param
->string
);
682 ret
= nfs_parse_security_flavors(fc
, param
);
688 protofamily
= AF_INET
;
689 switch (lookup_constant(nfs_xprt_protocol_tokens
, param
->string
, -1)) {
691 protofamily
= AF_INET6
;
694 ctx
->flags
&= ~NFS_MOUNT_TCP
;
695 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
698 protofamily
= AF_INET6
;
701 ctx
->flags
|= NFS_MOUNT_TCP
;
702 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
705 protofamily
= AF_INET6
;
708 /* vector side protocols to TCP */
709 ctx
->flags
|= NFS_MOUNT_TCP
;
710 ret
= xprt_find_transport_ident(param
->string
);
712 goto out_bad_transport
;
713 ctx
->nfs_server
.protocol
= ret
;
716 goto out_bad_transport
;
719 ctx
->protofamily
= protofamily
;
723 mountfamily
= AF_INET
;
724 switch (lookup_constant(nfs_xprt_protocol_tokens
, param
->string
, -1)) {
726 mountfamily
= AF_INET6
;
729 ctx
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
732 mountfamily
= AF_INET6
;
735 ctx
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
737 case Opt_xprt_rdma
: /* not used for side protocols */
739 goto out_bad_transport
;
741 ctx
->mountfamily
= mountfamily
;
745 len
= rpc_pton(fc
->net_ns
, param
->string
, param
->size
,
746 &ctx
->nfs_server
.address
,
747 sizeof(ctx
->nfs_server
._address
));
749 goto out_invalid_address
;
750 ctx
->nfs_server
.addrlen
= len
;
753 kfree(ctx
->client_address
);
754 ctx
->client_address
= param
->string
;
755 param
->string
= NULL
;
758 kfree(ctx
->mount_server
.hostname
);
759 ctx
->mount_server
.hostname
= param
->string
;
760 param
->string
= NULL
;
763 len
= rpc_pton(fc
->net_ns
, param
->string
, param
->size
,
764 &ctx
->mount_server
.address
,
765 sizeof(ctx
->mount_server
._address
));
767 goto out_invalid_address
;
768 ctx
->mount_server
.addrlen
= len
;
771 if (result
.uint_32
< 1 || result
.uint_32
> NFS_MAX_CONNECTIONS
)
773 ctx
->nfs_server
.nconnect
= result
.uint_32
;
775 case Opt_max_connect
:
776 if (result
.uint_32
< 1 || result
.uint_32
> NFS_MAX_TRANSPORTS
)
778 ctx
->nfs_server
.max_connect
= result
.uint_32
;
780 case Opt_lookupcache
:
781 switch (result
.uint_32
) {
782 case Opt_lookupcache_all
:
783 ctx
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
785 case Opt_lookupcache_positive
:
786 ctx
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
787 ctx
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
789 case Opt_lookupcache_none
:
790 ctx
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
793 goto out_invalid_value
;
797 switch (result
.uint_32
) {
798 case Opt_local_lock_all
:
799 ctx
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
800 NFS_MOUNT_LOCAL_FCNTL
);
802 case Opt_local_lock_flock
:
803 ctx
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
805 case Opt_local_lock_posix
:
806 ctx
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
808 case Opt_local_lock_none
:
809 ctx
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
810 NFS_MOUNT_LOCAL_FCNTL
);
813 goto out_invalid_value
;
817 switch (result
.uint_32
) {
820 ~(NFS_MOUNT_WRITE_EAGER
| NFS_MOUNT_WRITE_WAIT
);
822 case Opt_write_eager
:
823 ctx
->flags
|= NFS_MOUNT_WRITE_EAGER
;
824 ctx
->flags
&= ~NFS_MOUNT_WRITE_WAIT
;
828 NFS_MOUNT_WRITE_EAGER
| NFS_MOUNT_WRITE_WAIT
;
831 goto out_invalid_value
;
840 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
847 return nfs_invalf(fc
, "NFS: Bad mount option value specified");
849 return nfs_invalf(fc
, "NFS: Bad IP address specified");
851 return nfs_invalf(fc
, "NFS: Value for '%s' out of range", param
->key
);
853 return nfs_invalf(fc
, "NFS: Unrecognized transport protocol");
857 * Split fc->source into "hostname:export_path".
859 * The leftmost colon demarks the split between the server's hostname
860 * and the export path. If the hostname starts with a left square
861 * bracket, then it may contain colons.
863 * Note: caller frees hostname and export path, even on error.
865 static int nfs_parse_source(struct fs_context
*fc
,
866 size_t maxnamlen
, size_t maxpathlen
)
868 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
869 const char *dev_name
= fc
->source
;
873 if (unlikely(!dev_name
|| !*dev_name
)) {
874 dfprintk(MOUNT
, "NFS: device name not specified\n");
878 /* Is the host name protected with square brakcets? */
879 if (*dev_name
== '[') {
880 end
= strchr(++dev_name
, ']');
881 if (end
== NULL
|| end
[1] != ':')
882 goto out_bad_devname
;
884 len
= end
- dev_name
;
889 end
= strchr(dev_name
, ':');
891 goto out_bad_devname
;
892 len
= end
- dev_name
;
894 /* kill possible hostname list: not supported */
895 comma
= memchr(dev_name
, ',', len
);
897 len
= comma
- dev_name
;
903 kfree(ctx
->nfs_server
.hostname
);
905 /* N.B. caller will free nfs_server.hostname in all cases */
906 ctx
->nfs_server
.hostname
= kmemdup_nul(dev_name
, len
, GFP_KERNEL
);
907 if (!ctx
->nfs_server
.hostname
)
910 if (len
> maxpathlen
)
912 ctx
->nfs_server
.export_path
= kmemdup_nul(end
, len
, GFP_KERNEL
);
913 if (!ctx
->nfs_server
.export_path
)
916 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", ctx
->nfs_server
.export_path
);
920 return nfs_invalf(fc
, "NFS: device name not in host:path format");
922 nfs_errorf(fc
, "NFS: not enough memory to parse device name");
925 nfs_errorf(fc
, "NFS: server hostname too long");
926 return -ENAMETOOLONG
;
928 nfs_errorf(fc
, "NFS: export pathname too long");
929 return -ENAMETOOLONG
;
932 static inline bool is_remount_fc(struct fs_context
*fc
)
934 return fc
->root
!= NULL
;
938 * Parse monolithic NFS2/NFS3 mount data
939 * - fills in the mount root filehandle
941 * For option strings, user space handles the following behaviors:
943 * + DNS: mapping server host name to IP address ("addr=" option)
945 * + failure mode: how to behave if a mount request can't be handled
946 * immediately ("fg/bg" option)
948 * + retry: how often to retry a mount request ("retry=" option)
950 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
951 * mountproto=tcp after mountproto=udp, and so on
953 static int nfs23_parse_monolithic(struct fs_context
*fc
,
954 struct nfs_mount_data
*data
)
956 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
957 struct nfs_fh
*mntfh
= ctx
->mntfh
;
958 struct sockaddr
*sap
= (struct sockaddr
*)&ctx
->nfs_server
.address
;
959 int extra_flags
= NFS_MOUNT_LEGACY_INTERFACE
;
965 ctx
->version
= NFS_DEFAULT_VERSION
;
966 switch (data
->version
) {
974 if (data
->flags
& NFS_MOUNT_VER3
)
976 data
->root
.size
= NFS2_FHSIZE
;
977 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
978 /* Turn off security negotiation */
979 extra_flags
|= NFS_MOUNT_SECFLAVOUR
;
982 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
986 memset(data
->context
, 0, sizeof(data
->context
));
989 if (data
->flags
& NFS_MOUNT_VER3
) {
990 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
992 mntfh
->size
= data
->root
.size
;
995 mntfh
->size
= NFS2_FHSIZE
;
1000 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1001 if (mntfh
->size
< sizeof(mntfh
->data
))
1002 memset(mntfh
->data
+ mntfh
->size
, 0,
1003 sizeof(mntfh
->data
) - mntfh
->size
);
1006 * for proto == XPRT_TRANSPORT_UDP, which is what uses
1007 * to_exponential, implying shift: limit the shift value
1008 * to BITS_PER_LONG (majortimeo is unsigned long)
1010 if (!(data
->flags
& NFS_MOUNT_TCP
)) /* this will be UDP */
1011 if (data
->retrans
>= 64) /* shift value is too large */
1012 goto out_invalid_data
;
1015 * Translate to nfs_fs_context, which nfs_fill_super
1018 ctx
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1019 ctx
->flags
|= extra_flags
;
1020 ctx
->rsize
= data
->rsize
;
1021 ctx
->wsize
= data
->wsize
;
1022 ctx
->timeo
= data
->timeo
;
1023 ctx
->retrans
= data
->retrans
;
1024 ctx
->acregmin
= data
->acregmin
;
1025 ctx
->acregmax
= data
->acregmax
;
1026 ctx
->acdirmin
= data
->acdirmin
;
1027 ctx
->acdirmax
= data
->acdirmax
;
1028 ctx
->need_mount
= false;
1030 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1031 ctx
->nfs_server
.addrlen
= sizeof(data
->addr
);
1032 ctx
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
1033 if (sap
->sa_family
!= AF_INET
||
1034 !nfs_verify_server_address(sap
))
1035 goto out_no_address
;
1037 if (!(data
->flags
& NFS_MOUNT_TCP
))
1038 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1039 /* N.B. caller will free nfs_server.hostname in all cases */
1040 ctx
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1041 if (!ctx
->nfs_server
.hostname
)
1044 ctx
->namlen
= data
->namlen
;
1045 ctx
->bsize
= data
->bsize
;
1047 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1048 ctx
->selected_flavor
= data
->pseudoflavor
;
1050 ctx
->selected_flavor
= RPC_AUTH_UNIX
;
1052 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1053 ctx
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1054 NFS_MOUNT_LOCAL_FCNTL
);
1056 ctx
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1057 NFS_MOUNT_LOCAL_FCNTL
);
1060 * The legacy version 6 binary mount data from userspace has a
1061 * field used only to transport selinux information into the
1062 * kernel. To continue to support that functionality we
1063 * have a touch of selinux knowledge here in the NFS code. The
1064 * userspace code converted context=blah to just blah so we are
1065 * converting back to the full string selinux understands.
1067 if (data
->context
[0]){
1068 #ifdef CONFIG_SECURITY_SELINUX
1071 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1072 ret
= vfs_parse_fs_string(fc
, "context",
1073 data
->context
, strlen(data
->context
));
1086 ret
= nfs_validate_transport_protocol(fc
, ctx
);
1090 ctx
->skip_reconfig_option_check
= true;
1094 return generic_parse_monolithic(fc
, data
);
1097 if (is_remount_fc(fc
)) {
1098 ctx
->skip_reconfig_option_check
= true;
1101 return nfs_invalf(fc
, "NFS: mount program didn't pass any mount data");
1104 return nfs_invalf(fc
, "NFS: nfs_mount_data version does not support v3");
1107 return nfs_invalf(fc
, "NFS: nfs_mount_data version supports only AUTH_SYS");
1110 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options");
1114 return nfs_invalf(fc
, "NFS: mount program didn't pass remote address");
1117 return nfs_invalf(fc
, "NFS: invalid root filehandle");
1120 return nfs_invalf(fc
, "NFS: invalid binary mount data");
1123 #if IS_ENABLED(CONFIG_NFS_V4)
1124 struct compat_nfs_string
{
1129 static inline void compat_nfs_string(struct nfs_string
*dst
,
1130 struct compat_nfs_string
*src
)
1132 dst
->data
= compat_ptr(src
->data
);
1133 dst
->len
= src
->len
;
1136 struct compat_nfs4_mount_data_v1
{
1137 compat_int_t version
;
1142 compat_int_t retrans
;
1143 compat_int_t acregmin
;
1144 compat_int_t acregmax
;
1145 compat_int_t acdirmin
;
1146 compat_int_t acdirmax
;
1147 struct compat_nfs_string client_addr
;
1148 struct compat_nfs_string mnt_path
;
1149 struct compat_nfs_string hostname
;
1150 compat_uint_t host_addrlen
;
1151 compat_uptr_t host_addr
;
1153 compat_int_t auth_flavourlen
;
1154 compat_uptr_t auth_flavours
;
1157 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data
*data
)
1159 struct compat_nfs4_mount_data_v1
*compat
=
1160 (struct compat_nfs4_mount_data_v1
*)data
;
1162 /* copy the fields backwards */
1163 data
->auth_flavours
= compat_ptr(compat
->auth_flavours
);
1164 data
->auth_flavourlen
= compat
->auth_flavourlen
;
1165 data
->proto
= compat
->proto
;
1166 data
->host_addr
= compat_ptr(compat
->host_addr
);
1167 data
->host_addrlen
= compat
->host_addrlen
;
1168 compat_nfs_string(&data
->hostname
, &compat
->hostname
);
1169 compat_nfs_string(&data
->mnt_path
, &compat
->mnt_path
);
1170 compat_nfs_string(&data
->client_addr
, &compat
->client_addr
);
1171 data
->acdirmax
= compat
->acdirmax
;
1172 data
->acdirmin
= compat
->acdirmin
;
1173 data
->acregmax
= compat
->acregmax
;
1174 data
->acregmin
= compat
->acregmin
;
1175 data
->retrans
= compat
->retrans
;
1176 data
->timeo
= compat
->timeo
;
1177 data
->wsize
= compat
->wsize
;
1178 data
->rsize
= compat
->rsize
;
1179 data
->flags
= compat
->flags
;
1180 data
->version
= compat
->version
;
1184 * Validate NFSv4 mount options
1186 static int nfs4_parse_monolithic(struct fs_context
*fc
,
1187 struct nfs4_mount_data
*data
)
1189 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
1190 struct sockaddr
*sap
= (struct sockaddr
*)&ctx
->nfs_server
.address
;
1195 if (is_remount_fc(fc
))
1197 return nfs_invalf(fc
,
1198 "NFS4: mount program didn't pass any mount data");
1203 if (data
->version
!= 1)
1204 return generic_parse_monolithic(fc
, data
);
1206 if (in_compat_syscall())
1207 nfs4_compat_mount_data_conv(data
);
1209 if (data
->host_addrlen
> sizeof(ctx
->nfs_server
.address
))
1210 goto out_no_address
;
1211 if (data
->host_addrlen
== 0)
1212 goto out_no_address
;
1213 ctx
->nfs_server
.addrlen
= data
->host_addrlen
;
1214 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
1216 if (!nfs_verify_server_address(sap
))
1217 goto out_no_address
;
1218 ctx
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
1220 if (data
->auth_flavourlen
) {
1221 rpc_authflavor_t pseudoflavor
;
1223 if (data
->auth_flavourlen
> 1)
1224 goto out_inval_auth
;
1225 if (copy_from_user(&pseudoflavor
, data
->auth_flavours
,
1226 sizeof(pseudoflavor
)))
1228 ctx
->selected_flavor
= pseudoflavor
;
1230 ctx
->selected_flavor
= RPC_AUTH_UNIX
;
1233 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
1236 ctx
->nfs_server
.hostname
= c
;
1238 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
1241 ctx
->nfs_server
.export_path
= c
;
1242 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
1244 c
= strndup_user(data
->client_addr
.data
, 16);
1247 ctx
->client_address
= c
;
1250 * Translate to nfs_fs_context, which nfs_fill_super
1254 ctx
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
1255 ctx
->rsize
= data
->rsize
;
1256 ctx
->wsize
= data
->wsize
;
1257 ctx
->timeo
= data
->timeo
;
1258 ctx
->retrans
= data
->retrans
;
1259 ctx
->acregmin
= data
->acregmin
;
1260 ctx
->acregmax
= data
->acregmax
;
1261 ctx
->acdirmin
= data
->acdirmin
;
1262 ctx
->acdirmax
= data
->acdirmax
;
1263 ctx
->nfs_server
.protocol
= data
->proto
;
1264 ret
= nfs_validate_transport_protocol(fc
, ctx
);
1268 ctx
->skip_reconfig_option_check
= true;
1272 return nfs_invalf(fc
, "NFS4: Invalid number of RPC auth flavours %d",
1273 data
->auth_flavourlen
);
1276 return nfs_invalf(fc
, "NFS4: mount program didn't pass remote address");
1281 * Parse a monolithic block of data from sys_mount().
1283 static int nfs_fs_context_parse_monolithic(struct fs_context
*fc
,
1286 if (fc
->fs_type
== &nfs_fs_type
)
1287 return nfs23_parse_monolithic(fc
, data
);
1289 #if IS_ENABLED(CONFIG_NFS_V4)
1290 if (fc
->fs_type
== &nfs4_fs_type
)
1291 return nfs4_parse_monolithic(fc
, data
);
1294 return nfs_invalf(fc
, "NFS: Unsupported monolithic data version");
1298 * Validate the preparsed information in the config.
1300 static int nfs_fs_context_validate(struct fs_context
*fc
)
1302 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
1303 struct nfs_subversion
*nfs_mod
;
1304 struct sockaddr
*sap
= (struct sockaddr
*)&ctx
->nfs_server
.address
;
1305 int max_namelen
= PAGE_SIZE
;
1306 int max_pathlen
= NFS_MAXPATHLEN
;
1311 goto out_no_device_name
;
1313 /* Check for sanity first. */
1314 if (ctx
->minorversion
&& ctx
->version
!= 4)
1315 goto out_minorversion_mismatch
;
1317 if (ctx
->options
& NFS_OPTION_MIGRATION
&&
1318 (ctx
->version
!= 4 || ctx
->minorversion
!= 0))
1319 goto out_migration_misuse
;
1321 /* Verify that any proto=/mountproto= options match the address
1322 * families in the addr=/mountaddr= options.
1324 if (ctx
->protofamily
!= AF_UNSPEC
&&
1325 ctx
->protofamily
!= ctx
->nfs_server
.address
.sa_family
)
1326 goto out_proto_mismatch
;
1328 if (ctx
->mountfamily
!= AF_UNSPEC
) {
1329 if (ctx
->mount_server
.addrlen
) {
1330 if (ctx
->mountfamily
!= ctx
->mount_server
.address
.sa_family
)
1331 goto out_mountproto_mismatch
;
1333 if (ctx
->mountfamily
!= ctx
->nfs_server
.address
.sa_family
)
1334 goto out_mountproto_mismatch
;
1338 if (!nfs_verify_server_address(sap
))
1339 goto out_no_address
;
1341 ret
= nfs_validate_transport_protocol(fc
, ctx
);
1345 if (ctx
->version
== 4) {
1346 if (IS_ENABLED(CONFIG_NFS_V4
)) {
1347 if (ctx
->nfs_server
.protocol
== XPRT_TRANSPORT_RDMA
)
1348 port
= NFS_RDMA_PORT
;
1351 max_namelen
= NFS4_MAXNAMLEN
;
1352 max_pathlen
= NFS4_MAXPATHLEN
;
1353 ctx
->flags
&= ~(NFS_MOUNT_NONLM
| NFS_MOUNT_NOACL
|
1354 NFS_MOUNT_VER3
| NFS_MOUNT_LOCAL_FLOCK
|
1355 NFS_MOUNT_LOCAL_FCNTL
);
1357 goto out_v4_not_compiled
;
1360 nfs_set_mount_transport_protocol(ctx
);
1361 if (ctx
->nfs_server
.protocol
== XPRT_TRANSPORT_RDMA
)
1362 port
= NFS_RDMA_PORT
;
1365 nfs_set_port(sap
, &ctx
->nfs_server
.port
, port
);
1367 ret
= nfs_parse_source(fc
, max_namelen
, max_pathlen
);
1371 /* Load the NFS protocol module if we haven't done so yet */
1372 if (!ctx
->nfs_mod
) {
1373 nfs_mod
= get_nfs_version(ctx
->version
);
1374 if (IS_ERR(nfs_mod
)) {
1375 ret
= PTR_ERR(nfs_mod
);
1376 goto out_version_unavailable
;
1378 ctx
->nfs_mod
= nfs_mod
;
1381 /* Ensure the filesystem context has the correct fs_type */
1382 if (fc
->fs_type
!= ctx
->nfs_mod
->nfs_fs
) {
1383 module_put(fc
->fs_type
->owner
);
1384 __module_get(ctx
->nfs_mod
->nfs_fs
->owner
);
1385 fc
->fs_type
= ctx
->nfs_mod
->nfs_fs
;
1390 return nfs_invalf(fc
, "NFS: Device name not specified");
1391 out_v4_not_compiled
:
1392 nfs_errorf(fc
, "NFS: NFSv4 is not compiled into kernel");
1393 return -EPROTONOSUPPORT
;
1395 return nfs_invalf(fc
, "NFS: mount program didn't pass remote address");
1396 out_mountproto_mismatch
:
1397 return nfs_invalf(fc
, "NFS: Mount server address does not match mountproto= option");
1399 return nfs_invalf(fc
, "NFS: Server address does not match proto= option");
1400 out_minorversion_mismatch
:
1401 return nfs_invalf(fc
, "NFS: Mount option vers=%u does not support minorversion=%u",
1402 ctx
->version
, ctx
->minorversion
);
1403 out_migration_misuse
:
1404 return nfs_invalf(fc
, "NFS: 'Migration' not supported for this NFS version");
1405 out_version_unavailable
:
1406 nfs_errorf(fc
, "NFS: Version unavailable");
1411 * Create an NFS superblock by the appropriate method.
1413 static int nfs_get_tree(struct fs_context
*fc
)
1415 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
1416 int err
= nfs_fs_context_validate(fc
);
1421 return ctx
->nfs_mod
->rpc_ops
->try_get_tree(fc
);
1423 return nfs_get_tree_common(fc
);
1427 * Handle duplication of a configuration. The caller copied *src into *sc, but
1428 * it can't deal with resource pointers in the filesystem context, so we have
1429 * to do that. We need to clear pointers, copy data or get extra refs as
1432 static int nfs_fs_context_dup(struct fs_context
*fc
, struct fs_context
*src_fc
)
1434 struct nfs_fs_context
*src
= nfs_fc2context(src_fc
), *ctx
;
1436 ctx
= kmemdup(src
, sizeof(struct nfs_fs_context
), GFP_KERNEL
);
1440 ctx
->mntfh
= nfs_alloc_fhandle();
1445 nfs_copy_fh(ctx
->mntfh
, src
->mntfh
);
1447 __module_get(ctx
->nfs_mod
->owner
);
1448 ctx
->client_address
= NULL
;
1449 ctx
->mount_server
.hostname
= NULL
;
1450 ctx
->nfs_server
.export_path
= NULL
;
1451 ctx
->nfs_server
.hostname
= NULL
;
1452 ctx
->fscache_uniq
= NULL
;
1453 ctx
->clone_data
.fattr
= NULL
;
1454 fc
->fs_private
= ctx
;
1458 static void nfs_fs_context_free(struct fs_context
*fc
)
1460 struct nfs_fs_context
*ctx
= nfs_fc2context(fc
);
1464 nfs_free_server(ctx
->server
);
1466 put_nfs_version(ctx
->nfs_mod
);
1467 kfree(ctx
->client_address
);
1468 kfree(ctx
->mount_server
.hostname
);
1469 kfree(ctx
->nfs_server
.export_path
);
1470 kfree(ctx
->nfs_server
.hostname
);
1471 kfree(ctx
->fscache_uniq
);
1472 nfs_free_fhandle(ctx
->mntfh
);
1473 nfs_free_fattr(ctx
->clone_data
.fattr
);
1478 static const struct fs_context_operations nfs_fs_context_ops
= {
1479 .free
= nfs_fs_context_free
,
1480 .dup
= nfs_fs_context_dup
,
1481 .parse_param
= nfs_fs_context_parse_param
,
1482 .parse_monolithic
= nfs_fs_context_parse_monolithic
,
1483 .get_tree
= nfs_get_tree
,
1484 .reconfigure
= nfs_reconfigure
,
1488 * Prepare superblock configuration. We use the namespaces attached to the
1489 * context. This may be the current process's namespaces, or it may be a
1490 * container's namespaces.
1492 static int nfs_init_fs_context(struct fs_context
*fc
)
1494 struct nfs_fs_context
*ctx
;
1496 ctx
= kzalloc(sizeof(struct nfs_fs_context
), GFP_KERNEL
);
1500 ctx
->mntfh
= nfs_alloc_fhandle();
1501 if (unlikely(!ctx
->mntfh
)) {
1506 ctx
->protofamily
= AF_UNSPEC
;
1507 ctx
->mountfamily
= AF_UNSPEC
;
1508 ctx
->mount_server
.port
= NFS_UNSPEC_PORT
;
1511 /* reconfigure, start with the current config */
1512 struct nfs_server
*nfss
= fc
->root
->d_sb
->s_fs_info
;
1513 struct net
*net
= nfss
->nfs_client
->cl_net
;
1515 ctx
->flags
= nfss
->flags
;
1516 ctx
->rsize
= nfss
->rsize
;
1517 ctx
->wsize
= nfss
->wsize
;
1518 ctx
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
1519 ctx
->selected_flavor
= nfss
->client
->cl_auth
->au_flavor
;
1520 ctx
->acregmin
= nfss
->acregmin
/ HZ
;
1521 ctx
->acregmax
= nfss
->acregmax
/ HZ
;
1522 ctx
->acdirmin
= nfss
->acdirmin
/ HZ
;
1523 ctx
->acdirmax
= nfss
->acdirmax
/ HZ
;
1524 ctx
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
1525 ctx
->nfs_server
.port
= nfss
->port
;
1526 ctx
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
1527 ctx
->version
= nfss
->nfs_client
->rpc_ops
->version
;
1528 ctx
->minorversion
= nfss
->nfs_client
->cl_minorversion
;
1530 memcpy(&ctx
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
1531 ctx
->nfs_server
.addrlen
);
1533 if (fc
->net_ns
!= net
) {
1534 put_net(fc
->net_ns
);
1535 fc
->net_ns
= get_net(net
);
1538 ctx
->nfs_mod
= nfss
->nfs_client
->cl_nfs_mod
;
1539 __module_get(ctx
->nfs_mod
->owner
);
1542 ctx
->timeo
= NFS_UNSPEC_TIMEO
;
1543 ctx
->retrans
= NFS_UNSPEC_RETRANS
;
1544 ctx
->acregmin
= NFS_DEF_ACREGMIN
;
1545 ctx
->acregmax
= NFS_DEF_ACREGMAX
;
1546 ctx
->acdirmin
= NFS_DEF_ACDIRMIN
;
1547 ctx
->acdirmax
= NFS_DEF_ACDIRMAX
;
1548 ctx
->nfs_server
.port
= NFS_UNSPEC_PORT
;
1549 ctx
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1550 ctx
->selected_flavor
= RPC_AUTH_MAXFLAVOR
;
1551 ctx
->minorversion
= 0;
1552 ctx
->need_mount
= true;
1554 fc
->s_iflags
|= SB_I_STABLE_WRITES
;
1556 fc
->fs_private
= ctx
;
1557 fc
->ops
= &nfs_fs_context_ops
;
1561 struct file_system_type nfs_fs_type
= {
1562 .owner
= THIS_MODULE
,
1564 .init_fs_context
= nfs_init_fs_context
,
1565 .parameters
= nfs_fs_parameters
,
1566 .kill_sb
= nfs_kill_super
,
1567 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
1569 MODULE_ALIAS_FS("nfs");
1570 EXPORT_SYMBOL_GPL(nfs_fs_type
);
1572 #if IS_ENABLED(CONFIG_NFS_V4)
1573 struct file_system_type nfs4_fs_type
= {
1574 .owner
= THIS_MODULE
,
1576 .init_fs_context
= nfs_init_fs_context
,
1577 .parameters
= nfs_fs_parameters
,
1578 .kill_sb
= nfs_kill_super
,
1579 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
1581 MODULE_ALIAS_FS("nfs4");
1582 MODULE_ALIAS("nfs4");
1583 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
1584 #endif /* CONFIG_NFS_V4 */