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Merge branch 'stage-for-3.10' of git://git.gitorious.org/smack-next/kernel into ra...
[mirror_ubuntu-artful-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
5976687a 34#include <linux/sunrpc/addr.h>
f7b422b1
DH		 35#include <linux/sunrpc/stats.h>
36#include <linux/sunrpc/metrics.h>
0896a725 37#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 38#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 39#include <linux/nfs_fs.h>
40#include <linux/nfs_mount.h>
41#include <linux/nfs4_mount.h>
42#include <linux/lockd/bind.h>
f7b422b1
DH		 43#include <linux/seq_file.h>
44#include <linux/mount.h>
c02d7adf 45#include <linux/namei.h>
f7b422b1
DH		 46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
e50a7a1a 56#include <linux/nsproxy.h>
2446ab60 57#include <linux/rcupdate.h>
f7b422b1 58
f7b422b1
DH		 59#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
08734048 66#include "fscache.h"
76e697ba 67#include "nfs4session.h"
ae50c0b5 68#include "pnfs.h"
ab7017a3 69#include "nfs.h"
f7b422b1
DH		 70
71#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 72#define NFS_TEXT_DATA 1
f7b422b1 73
1c606fb7 74#if IS_ENABLED(CONFIG_NFS_V3)
1e657bd5
PZ		 75#define NFS_DEFAULT_VERSION 3
76#else
77#define NFS_DEFAULT_VERSION 2
78#endif
79
bf0fd768
CL		 80enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
bf0fd768
CL		 83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
2cf7ff7a 87 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
75180df2 90 Opt_sharecache, Opt_nosharecache,
d740351b 91 Opt_resvport, Opt_noresvport,
b797cac7 92 Opt_fscache, Opt_nofscache,
89652617 93 Opt_migration, Opt_nomigration,
bf0fd768
CL		 94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
e887cbcf 104 Opt_mountvers,
3fd5be9e 105 Opt_minorversion,
bf0fd768
CL		 106
107 /* Mount options that take string arguments */
0d71b058 108 Opt_nfsvers,
33832034 109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 111 Opt_lookupcache,
b797cac7 112 Opt_fscache_uniq,
5eebde23 113 Opt_local_lock,
bf0fd768 114
f45663ce
CL		 115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 117
118 Opt_err
119};
120
a447c093 121static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
ecbb3845
CL		 124 { Opt_userspace, "retry=%s" },
125
f45663ce
CL		 126 { Opt_sloppy, "sloppy" },
127
bf0fd768
CL		 128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
d33e4dfe
CL		 130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
bf0fd768
CL		 132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
bf0fd768
CL		 140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
2cf7ff7a 142 { Opt_rdma, "rdma" },
bf0fd768
CL		 143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
b797cac7 151 { Opt_fscache, "fsc" },
b797cac7 152 { Opt_nofscache, "nofsc" },
89652617
CL		 153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
bf0fd768 155
a5a16bae
CL		 156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 170 { Opt_minorversion, "minorversion=%s" },
171
a5a16bae
CL		 172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
33832034 180 { Opt_mounthost, "mounthost=%s" },
0ac83779 181 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 182
7973c1f1 183 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 184 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 185 { Opt_local_lock, "local_lock=%s" },
7973c1f1 186
3862279a
TM		 187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
bf0fd768
CL		 190 { Opt_err, NULL }
191};
192
193enum {
ee671b01 194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 195
196 Opt_xprt_err
197};
198
a447c093 199static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 200 { Opt_xprt_udp, "udp" },
ee671b01 201 { Opt_xprt_udp6, "udp6" },
bf0fd768 202 { Opt_xprt_tcp, "tcp" },
ee671b01 203 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 204 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 205
206 { Opt_xprt_err, NULL }
207};
208
209enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216};
217
a447c093 218static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
8d042218
OK		 231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
bf0fd768
CL		 235 { Opt_sec_err, NULL }
236};
237
7973c1f1
TM		 238enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243};
244
245static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252};
253
5eebde23
SJ		 254enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259};
260
261static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268};
269
0d71b058
TM		 270enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1,
273
274 Opt_vers_err
275};
276
277static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283
284 { Opt_vers_err, NULL }
285};
bf0fd768 286
31f43471
AV		 287static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
f7b422b1 289
ab7017a3 290struct file_system_type nfs_fs_type = {
f7b422b1
DH		 291 .owner = THIS_MODULE,
292 .name = "nfs",
01194981 293 .mount = nfs_fs_mount,
f7b422b1 294 .kill_sb = nfs_kill_super,
ecf3d1f1 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1 296};
7f78e035 297MODULE_ALIAS_FS("nfs");
ddda8e0a 298EXPORT_SYMBOL_GPL(nfs_fs_type);
f7b422b1 299
54ceac45 300struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 301 .owner = THIS_MODULE,
302 .name = "nfs",
31f43471 303 .mount = nfs_xdev_mount,
f7b422b1 304 .kill_sb = nfs_kill_super,
ecf3d1f1 305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 306};
307
6a74490d 308const struct super_operations nfs_sops = {
f7b422b1
DH		 309 .alloc_inode = nfs_alloc_inode,
310 .destroy_inode = nfs_destroy_inode,
311 .write_inode = nfs_write_inode,
eed99357 312 .drop_inode = nfs_drop_inode,
387c149b 313 .put_super = nfs_put_super,
f7b422b1 314 .statfs = nfs_statfs,
b57922d9 315 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
c7f404b4
AV		 318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
f7b422b1 320 .show_stats = nfs_show_stats,
48b605f8 321 .remount_fs = nfs_remount,
f7b422b1 322};
ddda8e0a 323EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 324
89d77c8f 325#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42 326static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 327static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
1ae811ee 329
330struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
332 .name = "nfs4",
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
ecf3d1f1 335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1ae811ee 336};
7f78e035 337MODULE_ALIAS_FS("nfs4");
1ae811ee 338EXPORT_SYMBOL_GPL(nfs4_fs_type);
339
340static int __init register_nfs4_fs(void)
341{
342 return register_filesystem(&nfs4_fs_type);
343}
344
345static void unregister_nfs4_fs(void)
346{
347 unregister_filesystem(&nfs4_fs_type);
348}
349#else
350static int __init register_nfs4_fs(void)
351{
352 return 0;
353}
354
355static void unregister_nfs4_fs(void)
356{
357}
f7b422b1
DH		 358#endif
359
8e1f936b
RR		 360static struct shrinker acl_shrinker = {
361 .shrink = nfs_access_cache_shrinker,
362 .seeks = DEFAULT_SEEKS,
363};
979df72e 364
f7b422b1
DH		 365/*
366 * Register the NFS filesystems
367 */
368int __init register_nfs_fs(void)
369{
370 int ret;
371
372 ret = register_filesystem(&nfs_fs_type);
373 if (ret < 0)
374 goto error_0;
375
1ae811ee 376 ret = register_nfs4_fs();
f7b422b1
DH		 377 if (ret < 0)
378 goto error_1;
1ae811ee 379
380 ret = nfs_register_sysctl();
381 if (ret < 0)
382 goto error_2;
8e1f936b 383 register_shrinker(&acl_shrinker);
f7b422b1
DH		 384 return 0;
385
1ae811ee 386error_2:
387 unregister_nfs4_fs();
f7b422b1
DH		 388error_1:
389 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 390error_0:
391 return ret;
392}
393
394/*
395 * Unregister the NFS filesystems
396 */
397void __exit unregister_nfs_fs(void)
398{
8e1f936b 399 unregister_shrinker(&acl_shrinker);
49af7ee1 400 nfs_unregister_sysctl();
1ae811ee 401 unregister_nfs4_fs();
f7b422b1
DH		 402 unregister_filesystem(&nfs_fs_type);
403}
404
1daef0a8 405void nfs_sb_active(struct super_block *sb)
ef818a28 406{
1daef0a8 407 struct nfs_server *server = NFS_SB(sb);
ef818a28 408
1daef0a8
TM		 409 if (atomic_inc_return(&server->active) == 1)
410 atomic_inc(&sb->s_active);
ef818a28 411}
89d77c8f 412EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 413
1daef0a8 414void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 415{
416 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 417
418 if (atomic_dec_and_test(&server->active))
419 deactivate_super(sb);
ef818a28 420}
89d77c8f 421EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 422
f7b422b1
DH		 423/*
424 * Deliver file system statistics to userspace
425 */
fbdefd64 426int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 427{
0c7d90cf 428 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 429 unsigned char blockbits;
430 unsigned long blockres;
0c7d90cf 431 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 432 struct nfs_fsstat res;
433 int error = -ENOMEM;
434
435 res.fattr = nfs_alloc_fattr();
436 if (res.fattr == NULL)
437 goto out_err;
f7b422b1 438
8fa5c000 439 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 440 if (unlikely(error == -ESTALE)) {
441 struct dentry *pd_dentry;
442
443 pd_dentry = dget_parent(dentry);
444 if (pd_dentry != NULL) {
445 nfs_zap_caches(pd_dentry->d_inode);
446 dput(pd_dentry);
447 }
448 }
ca7e9a0d 449 nfs_free_fattr(res.fattr);
f7b422b1
DH		 450 if (error < 0)
451 goto out_err;
ca7e9a0d 452
1a0ba9ae 453 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 454
455 /*
456 * Current versions of glibc do not correctly handle the
457 * case where f_frsize != f_bsize. Eventually we want to
458 * report the value of wtmult in this field.
459 */
0c7d90cf 460 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 461
462 /*
463 * On most *nix systems, f_blocks, f_bfree, and f_bavail
464 * are reported in units of f_frsize. Linux hasn't had
465 * an f_frsize field in its statfs struct until recently,
466 * thus historically Linux's sys_statfs reports these
467 * fields in units of f_bsize.
468 */
0c7d90cf
DH		 469 buf->f_bsize = dentry->d_sb->s_blocksize;
470 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 471 blockres = (1 << blockbits) - 1;
472 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
473 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
474 buf->f_bavail = (res.abytes + blockres) >> blockbits;
475
476 buf->f_files = res.tfiles;
477 buf->f_ffree = res.afiles;
478
479 buf->f_namelen = server->namelen;
1a0ba9ae 480
f7b422b1
DH		 481 return 0;
482
483 out_err:
3110ff80 484 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 485 return error;
f7b422b1 486}
89d77c8f 487EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 488
7d4e2747
DH		 489/*
490 * Map the security flavour number to a name
491 */
81039f1f
TM		 492static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
493{
7d4e2747 494 static const struct {
81039f1f
TM		 495 rpc_authflavor_t flavour;
496 const char *str;
497 } sec_flavours[] = {
498 { RPC_AUTH_NULL, "null" },
499 { RPC_AUTH_UNIX, "sys" },
500 { RPC_AUTH_GSS_KRB5, "krb5" },
501 { RPC_AUTH_GSS_KRB5I, "krb5i" },
502 { RPC_AUTH_GSS_KRB5P, "krb5p" },
503 { RPC_AUTH_GSS_LKEY, "lkey" },
504 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
505 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
506 { RPC_AUTH_GSS_SPKM, "spkm" },
507 { RPC_AUTH_GSS_SPKMI, "spkmi" },
508 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 509 { UINT_MAX, "unknown" }
81039f1f
TM		 510 };
511 int i;
512
4d81cd16 513 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 514 if (sec_flavours[i].flavour == flavour)
515 break;
516 }
517 return sec_flavours[i].str;
518}
519
ee671b01
JL		 520static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
521 int showdefaults)
522{
523 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
524
525 seq_printf(m, ",mountproto=");
526 switch (sap->sa_family) {
527 case AF_INET:
528 switch (nfss->mountd_protocol) {
529 case IPPROTO_UDP:
530 seq_printf(m, RPCBIND_NETID_UDP);
531 break;
532 case IPPROTO_TCP:
533 seq_printf(m, RPCBIND_NETID_TCP);
534 break;
535 default:
536 if (showdefaults)
537 seq_printf(m, "auto");
538 }
539 break;
540 case AF_INET6:
541 switch (nfss->mountd_protocol) {
542 case IPPROTO_UDP:
543 seq_printf(m, RPCBIND_NETID_UDP6);
544 break;
545 case IPPROTO_TCP:
546 seq_printf(m, RPCBIND_NETID_TCP6);
547 break;
548 default:
549 if (showdefaults)
550 seq_printf(m, "auto");
551 }
552 break;
553 default:
554 if (showdefaults)
555 seq_printf(m, "auto");
556 }
557}
558
82d101d5
CL		 559static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
560 int showdefaults)
561{
562 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
563
d5eff1a3
BS		 564 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
565 return;
566
82d101d5
CL		 567 switch (sap->sa_family) {
568 case AF_INET: {
569 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 570 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 571 break;
572 }
573 case AF_INET6: {
574 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 575 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 576 break;
577 }
578 default:
579 if (showdefaults)
580 seq_printf(m, ",mountaddr=unspecified");
581 }
582
583 if (nfss->mountd_version || showdefaults)
584 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 585 if ((nfss->mountd_port &&
586 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
587 showdefaults)
82d101d5
CL		 588 seq_printf(m, ",mountport=%u", nfss->mountd_port);
589
ee671b01 590 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 591}
592
89d77c8f 593#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 594static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
595 int showdefaults)
596{
597 struct nfs_client *clp = nfss->nfs_client;
598
599 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 600}
601#else
602static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604{
605}
606#endif
607
7bbceb6f
TM		 608static void nfs_show_nfs_version(struct seq_file *m,
609 unsigned int version,
610 unsigned int minorversion)
611{
612 seq_printf(m, ",vers=%u", version);
613 if (version == 4)
614 seq_printf(m, ".%u", minorversion);
615}
616
f7b422b1
DH		 617/*
618 * Describe the mount options in force on this server representation
619 */
82d101d5
CL		 620static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
621 int showdefaults)
f7b422b1 622{
509de811 623 static const struct proc_nfs_info {
f7b422b1 624 int flag;
509de811
DH		 625 const char *str;
626 const char *nostr;
f7b422b1
DH		 627 } nfs_info[] = {
628 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 629 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 630 { NFS_MOUNT_NOCTO, ",nocto", "" },
631 { NFS_MOUNT_NOAC, ",noac", "" },
632 { NFS_MOUNT_NONLM, ",nolock", "" },
633 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 634 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 635 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
636 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 637 { 0, NULL, NULL }
638 };
509de811 639 const struct proc_nfs_info *nfs_infop;
8fa5c000 640 struct nfs_client *clp = nfss->nfs_client;
82d101d5 641 u32 version = clp->rpc_ops->version;
7c563cc9 642 int local_flock, local_fcntl;
f7b422b1 643
7bbceb6f 644 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 645 seq_printf(m, ",rsize=%u", nfss->rsize);
646 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 647 if (nfss->bsize != 0)
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 650 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 651 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 652 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 653 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 654 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 655 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 656 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 657 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 658 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
659 if (nfss->flags & nfs_infop->flag)
660 seq_puts(m, nfs_infop->str);
661 else
662 seq_puts(m, nfs_infop->nostr);
663 }
2446ab60 664 rcu_read_lock();
56928edd 665 seq_printf(m, ",proto=%s",
ee671b01 666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 667 rcu_read_unlock();
82d101d5
CL		 668 if (version == 4) {
669 if (nfss->port != NFS_PORT)
670 seq_printf(m, ",port=%u", nfss->port);
671 } else
672 if (nfss->port)
673 seq_printf(m, ",port=%u", nfss->port);
674
33170233
TM		 675 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
676 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 677 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 678
679 if (version != 4)
680 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 681 else
682 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 683
b797cac7
DH		 684 if (nfss->options & NFS_OPTION_FSCACHE)
685 seq_printf(m, ",fsc");
9b00c643 686
89652617
CL		 687 if (nfss->options & NFS_OPTION_MIGRATION)
688 seq_printf(m, ",migration");
689
9b00c643
PL		 690 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
692 seq_printf(m, ",lookupcache=none");
693 else
694 seq_printf(m, ",lookupcache=pos");
695 }
7c563cc9
SJ		 696
697 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
698 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
699
700 if (!local_flock && !local_fcntl)
701 seq_printf(m, ",local_lock=none");
702 else if (local_flock && local_fcntl)
703 seq_printf(m, ",local_lock=all");
704 else if (local_flock)
705 seq_printf(m, ",local_lock=flock");
706 else
707 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 708}
709
710/*
711 * Describe the mount options on this VFS mountpoint
712 */
fbdefd64 713int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 714{
34c80b1d 715 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 716
717 nfs_show_mount_options(m, nfss, 0);
718
2446ab60 719 rcu_read_lock();
5d8515ca
CL		 720 seq_printf(m, ",addr=%s",
721 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
722 RPC_DISPLAY_ADDR));
2446ab60 723 rcu_read_unlock();
f7b422b1
DH		 724
725 return 0;
726}
89d77c8f 727EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 728
89d77c8f 729#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 730#ifdef CONFIG_NFS_V4_1
45402c38 731static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 732{
733 if (nfs4_has_session(server->nfs_client))
734 seq_printf(m, ",sessions");
735}
736#else
45402c38
HS		 737static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
738#endif
ae50c0b5
BF		 739#endif
740
741#ifdef CONFIG_NFS_V4_1
45402c38 742static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 743{
744 seq_printf(m, ",pnfs=");
745 if (server->pnfs_curr_ld)
746 seq_printf(m, "%s", server->pnfs_curr_ld->name);
747 else
748 seq_printf(m, "not configured");
749}
7e03b7cc
TM		 750
751static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
752{
59155546
CL		 753 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
754 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 755 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
756 "date='%llu,%u'",
757 impl_id->name, impl_id->domain,
758 impl_id->date.seconds, impl_id->date.nseconds);
759 }
760}
45402c38 761#else
89d77c8f 762#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 763static void show_pnfs(struct seq_file *m, struct nfs_server *server)
764{
765}
45402c38 766#endif
7e03b7cc
TM		 767static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
768{
769}
45402c38 770#endif
f7b422b1 771
fbdefd64 772int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 773{
774 char *page = (char *) __get_free_page(GFP_KERNEL);
775 char *devname, *dummy;
776 int err = 0;
777 if (!page)
778 return -ENOMEM;
97a54868 779 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 780 if (IS_ERR(devname))
781 err = PTR_ERR(devname);
782 else
783 seq_escape(m, devname, " \t\n\\");
784 free_page((unsigned long)page);
785 return err;
786}
89d77c8f 787EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 788
fbdefd64 789int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 790{
791 seq_puts(m, "/");
792 return 0;
793}
89d77c8f 794EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 795
f7b422b1
DH		 796/*
797 * Present statistical information for this VFS mountpoint
798 */
fbdefd64 799int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 800{
801 int i, cpu;
64132379 802 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 803 struct rpc_auth *auth = nfss->client->cl_auth;
804 struct nfs_iostats totals = { };
805
806 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
807
808 /*
809 * Display all mount option settings
810 */
811 seq_printf(m, "\n\topts:\t");
64132379
AV		 812 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
813 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
814 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
815 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 816 nfs_show_mount_options(m, nfss, 1);
817
818 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
819
7e03b7cc 820 show_implementation_id(m, nfss);
7d2ed9ac 821
f7b422b1
DH		 822 seq_printf(m, "\n\tcaps:\t");
823 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 824 seq_printf(m, ",wtmult=%u", nfss->wtmult);
825 seq_printf(m, ",dtsize=%u", nfss->dtsize);
826 seq_printf(m, ",bsize=%u", nfss->bsize);
827 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 828
89d77c8f 829#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 830 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 831 seq_printf(m, "\n\tnfsv4:\t");
832 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
833 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
834 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 835 show_sessions(m, nfss);
836 show_pnfs(m, nfss);
f7b422b1
DH		 837 }
838#endif
839
840 /*
841 * Display security flavor in effect for this mount
842 */
2d767432 843 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 844 if (auth->au_flavor)
2d767432 845 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 846
847 /*
848 * Display superblock I/O counters
849 */
850 for_each_possible_cpu(cpu) {
851 struct nfs_iostats *stats;
852
853 preempt_disable();
854 stats = per_cpu_ptr(nfss->io_stats, cpu);
855
856 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
857 totals.events[i] += stats->events[i];
858 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
859 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 860#ifdef CONFIG_NFS_FSCACHE
861 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
862 totals.fscache[i] += stats->fscache[i];
863#endif
f7b422b1
DH		 864
865 preempt_enable();
866 }
867
868 seq_printf(m, "\n\tevents:\t");
869 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
870 seq_printf(m, "%lu ", totals.events[i]);
871 seq_printf(m, "\n\tbytes:\t");
872 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
873 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 874#ifdef CONFIG_NFS_FSCACHE
875 if (nfss->options & NFS_OPTION_FSCACHE) {
876 seq_printf(m, "\n\tfsc:\t");
877 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
878 seq_printf(m, "%Lu ", totals.bytes[i]);
879 }
880#endif
f7b422b1
DH		 881 seq_printf(m, "\n");
882
883 rpc_print_iostats(m, nfss->client);
884
885 return 0;
886}
89d77c8f 887EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 888
889/*
890 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 891 * in response to xdev traversals and referrals
f7b422b1 892 */
fbdefd64 893void nfs_umount_begin(struct super_block *sb)
f7b422b1 894{
67e55205 895 struct nfs_server *server;
fc6ae3cf
TM		 896 struct rpc_clnt *rpc;
897
67e55205 898 server = NFS_SB(sb);
fc6ae3cf
TM		 899 /* -EIO all pending I/O */
900 rpc = server->client_acl;
901 if (!IS_ERR(rpc))
902 rpc_killall_tasks(rpc);
903 rpc = server->client;
904 if (!IS_ERR(rpc))
905 rpc_killall_tasks(rpc);
f7b422b1 906}
89d77c8f 907EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 908
db833351 909static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 910{
911 struct nfs_parsed_mount_data *data;
912
913 data = kzalloc(sizeof(*data), GFP_KERNEL);
914 if (data) {
9423a08a
CL		 915 data->acregmin = NFS_DEF_ACREGMIN;
916 data->acregmax = NFS_DEF_ACREGMAX;
917 data->acdirmin = NFS_DEF_ACDIRMIN;
918 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 919 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 920 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 921 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 922 data->auth_flavors[0] = RPC_AUTH_UNIX;
923 data->auth_flavor_len = 1;
924 data->minorversion = 0;
b72e4f42 925 data->need_mount = true;
9937347a 926 data->net = current->nsproxy->net_ns;
8a0d551a 927 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 928 }
929 return data;
930}
931
8a0d551a
JL		 932static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
933{
934 if (data) {
935 kfree(data->client_address);
936 kfree(data->mount_server.hostname);
937 kfree(data->nfs_server.export_path);
938 kfree(data->nfs_server.hostname);
939 kfree(data->fscache_uniq);
940 security_free_mnt_opts(&data->lsm_opts);
941 kfree(data);
942 }
943}
944
fc50d58f 945/*
cdcd7f9a
CL		 946 * Sanity-check a server address provided by the mount command.
947 *
948 * Address family must be initialized, and address must not be
949 * the ANY address for that family.
fc50d58f
CL		 950 */
951static int nfs_verify_server_address(struct sockaddr *addr)
952{
953 switch (addr->sa_family) {
954 case AF_INET: {
cdcd7f9a 955 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 956 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 957 }
958 case AF_INET6: {
959 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
960 return !ipv6_addr_any(sa);
fc50d58f
CL		 961 }
962 }
963
53a0b9c4 964 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 965 return 0;
966}
967
4cfd74fc
CL		 968/*
969 * Select between a default port value and a user-specified port value.
970 * If a zero value is set, then autobind will be used.
971 */
f5855fec 972static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 973 const unsigned short default_port)
974{
f5855fec
TM		 975 if (*port == NFS_UNSPEC_PORT)
976 *port = default_port;
4cfd74fc 977
f5855fec 978 rpc_set_port(sap, *port);
4cfd74fc
CL		 979}
980
259875ef
TM		 981/*
982 * Sanity check the NFS transport protocol.
983 *
984 */
985static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
986{
987 switch (mnt->nfs_server.protocol) {
988 case XPRT_TRANSPORT_UDP:
989 case XPRT_TRANSPORT_TCP:
990 case XPRT_TRANSPORT_RDMA:
991 break;
992 default:
993 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
994 }
995}
996
997/*
998 * For text based NFSv2/v3 mounts, the mount protocol transport default
999 * settings should depend upon the specified NFS transport.
1000 */
1001static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1002{
1003 nfs_validate_transport_protocol(mnt);
1004
1005 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1006 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1007 return;
1008 switch (mnt->nfs_server.protocol) {
1009 case XPRT_TRANSPORT_UDP:
1010 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1011 break;
1012 case XPRT_TRANSPORT_TCP:
1013 case XPRT_TRANSPORT_RDMA:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1015 }
1016}
1017
01060c89
CL		 1018/*
1019 * Parse the value of the 'sec=' option.
01060c89
CL		 1020 */
1021static int nfs_parse_security_flavors(char *value,
1022 struct nfs_parsed_mount_data *mnt)
1023{
1024 substring_t args[MAX_OPT_ARGS];
1025
1026 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1027
1028 switch (match_token(value, nfs_secflavor_tokens, args)) {
1029 case Opt_sec_none:
01060c89
CL		 1030 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1031 break;
1032 case Opt_sec_sys:
01060c89
CL		 1033 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1034 break;
1035 case Opt_sec_krb5:
01060c89
CL		 1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1037 break;
1038 case Opt_sec_krb5i:
01060c89
CL		 1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1040 break;
1041 case Opt_sec_krb5p:
01060c89
CL		 1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1043 break;
1044 case Opt_sec_lkey:
01060c89
CL		 1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1046 break;
1047 case Opt_sec_lkeyi:
01060c89
CL		 1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1049 break;
1050 case Opt_sec_lkeyp:
01060c89
CL		 1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1052 break;
1053 case Opt_sec_spkm:
01060c89
CL		 1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1055 break;
1056 case Opt_sec_spkmi:
01060c89
CL		 1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1058 break;
1059 case Opt_sec_spkmp:
01060c89
CL		 1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1061 break;
1062 default:
1063 return 0;
1064 }
1065
9b7160c5 1066 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1067 mnt->auth_flavor_len = 1;
01060c89
CL		 1068 return 1;
1069}
1070
0d71b058
TM		 1071static int nfs_parse_version_string(char *string,
1072 struct nfs_parsed_mount_data *mnt,
1073 substring_t *args)
1074{
1075 mnt->flags &= ~NFS_MOUNT_VER3;
1076 switch (match_token(string, nfs_vers_tokens, args)) {
1077 case Opt_vers_2:
1078 mnt->version = 2;
1079 break;
1080 case Opt_vers_3:
1081 mnt->flags |= NFS_MOUNT_VER3;
1082 mnt->version = 3;
1083 break;
1084 case Opt_vers_4:
1085 /* Backward compatibility option. In future,
1086 * the mount program should always supply
1087 * a NFSv4 minor version number.
1088 */
1089 mnt->version = 4;
1090 break;
1091 case Opt_vers_4_0:
1092 mnt->version = 4;
1093 mnt->minorversion = 0;
1094 break;
1095 case Opt_vers_4_1:
1096 mnt->version = 4;
1097 mnt->minorversion = 1;
1098 break;
1099 default:
1100 return 0;
1101 }
1102 return 1;
1103}
1104
c5cb09b6
RL		 1105static int nfs_get_option_str(substring_t args[], char **option)
1106{
1107 kfree(*option);
1108 *option = match_strdup(args);
e25fbe38 1109 return !*option;
c5cb09b6
RL		 1110}
1111
1112static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1113{
1114 int rc;
1115 char *string;
1116
1117 string = match_strdup(args);
1118 if (string == NULL)
1119 return -ENOMEM;
7297cb68 1120 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1121 kfree(string);
1122
1123 return rc;
1124}
1125
bf0fd768
CL		 1126/*
1127 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1128 * a data structure. The whole mount string is processed; bad options are
1129 * skipped as they are encountered. If there were no errors, return 1;
1130 * otherwise return 0 (zero).
bf0fd768
CL		 1131 */
1132static int nfs_parse_mount_options(char *raw,
1133 struct nfs_parsed_mount_data *mnt)
1134{
f9c3a380 1135 char *p, *string, *secdata;
d23c45fd 1136 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1137 unsigned short protofamily = AF_UNSPEC;
1138 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1139
1140 if (!raw) {
1141 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1142 return 1;
1143 }
1144 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1145
f9c3a380
EP		 1146 secdata = alloc_secdata();
1147 if (!secdata)
1148 goto out_nomem;
1149
1150 rc = security_sb_copy_data(raw, secdata);
1151 if (rc)
1152 goto out_security_failure;
1153
1154 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1155 if (rc)
1156 goto out_security_failure;
1157
1158 free_secdata(secdata);
1159
bf0fd768
CL		 1160 while ((p = strsep(&raw, ",")) != NULL) {
1161 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1162 unsigned long option;
1163 int token;
bf0fd768
CL		 1164
1165 if (!*p)
1166 continue;
1167
1168 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1169
1170 token = match_token(p, nfs_mount_option_tokens, args);
1171 switch (token) {
f45663ce
CL		 1172
1173 /*
1174 * boolean options: foo/nofoo
1175 */
bf0fd768
CL		 1176 case Opt_soft:
1177 mnt->flags |= NFS_MOUNT_SOFT;
1178 break;
1179 case Opt_hard:
1180 mnt->flags &= ~NFS_MOUNT_SOFT;
1181 break;
bf0fd768
CL		 1182 case Opt_posix:
1183 mnt->flags |= NFS_MOUNT_POSIX;
1184 break;
1185 case Opt_noposix:
1186 mnt->flags &= ~NFS_MOUNT_POSIX;
1187 break;
1188 case Opt_cto:
1189 mnt->flags &= ~NFS_MOUNT_NOCTO;
1190 break;
1191 case Opt_nocto:
1192 mnt->flags |= NFS_MOUNT_NOCTO;
1193 break;
1194 case Opt_ac:
1195 mnt->flags &= ~NFS_MOUNT_NOAC;
1196 break;
1197 case Opt_noac:
1198 mnt->flags |= NFS_MOUNT_NOAC;
1199 break;
1200 case Opt_lock:
1201 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1202 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1203 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1204 break;
1205 case Opt_nolock:
1206 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1207 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1208 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1209 break;
bf0fd768
CL		 1210 case Opt_udp:
1211 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1212 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1213 break;
1214 case Opt_tcp:
1215 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1216 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1217 break;
2cf7ff7a
TT		 1218 case Opt_rdma:
1219 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1220 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1221 xprt_load_transport(p);
2cf7ff7a 1222 break;
bf0fd768
CL		 1223 case Opt_acl:
1224 mnt->flags &= ~NFS_MOUNT_NOACL;
1225 break;
1226 case Opt_noacl:
1227 mnt->flags |= NFS_MOUNT_NOACL;
1228 break;
1229 case Opt_rdirplus:
1230 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1231 break;
1232 case Opt_nordirplus:
1233 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1234 break;
75180df2
TM		 1235 case Opt_sharecache:
1236 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1237 break;
1238 case Opt_nosharecache:
1239 mnt->flags |= NFS_MOUNT_UNSHARED;
1240 break;
d740351b
CL		 1241 case Opt_resvport:
1242 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1243 break;
1244 case Opt_noresvport:
1245 mnt->flags |= NFS_MOUNT_NORESVPORT;
1246 break;
b797cac7
DH		 1247 case Opt_fscache:
1248 mnt->options |= NFS_OPTION_FSCACHE;
1249 kfree(mnt->fscache_uniq);
1250 mnt->fscache_uniq = NULL;
1251 break;
1252 case Opt_nofscache:
1253 mnt->options &= ~NFS_OPTION_FSCACHE;
1254 kfree(mnt->fscache_uniq);
1255 mnt->fscache_uniq = NULL;
1256 break;
89652617
CL		 1257 case Opt_migration:
1258 mnt->options |= NFS_OPTION_MIGRATION;
1259 break;
1260 case Opt_nomigration:
1261 mnt->options &= NFS_OPTION_MIGRATION;
1262 break;
bf0fd768 1263
f45663ce
CL		 1264 /*
1265 * options that take numeric values
1266 */
bf0fd768 1267 case Opt_port:
c5cb09b6
RL		 1268 if (nfs_get_option_ul(args, &option) ||
1269 option > USHRT_MAX)
d23c45fd
CL		 1270 goto out_invalid_value;
1271 mnt->nfs_server.port = option;
bf0fd768
CL		 1272 break;
1273 case Opt_rsize:
c5cb09b6 1274 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1275 goto out_invalid_value;
1276 mnt->rsize = option;
bf0fd768
CL		 1277 break;
1278 case Opt_wsize:
c5cb09b6 1279 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1280 goto out_invalid_value;
1281 mnt->wsize = option;
bf0fd768
CL		 1282 break;
1283 case Opt_bsize:
c5cb09b6 1284 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1285 goto out_invalid_value;
1286 mnt->bsize = option;
bf0fd768
CL		 1287 break;
1288 case Opt_timeo:
c5cb09b6 1289 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1290 goto out_invalid_value;
1291 mnt->timeo = option;
bf0fd768
CL		 1292 break;
1293 case Opt_retrans:
c5cb09b6 1294 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1295 goto out_invalid_value;
1296 mnt->retrans = option;
bf0fd768
CL		 1297 break;
1298 case Opt_acregmin:
c5cb09b6 1299 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1300 goto out_invalid_value;
1301 mnt->acregmin = option;
bf0fd768
CL		 1302 break;
1303 case Opt_acregmax:
c5cb09b6 1304 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1305 goto out_invalid_value;
1306 mnt->acregmax = option;
bf0fd768
CL		 1307 break;
1308 case Opt_acdirmin:
c5cb09b6 1309 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1310 goto out_invalid_value;
1311 mnt->acdirmin = option;
bf0fd768
CL		 1312 break;
1313 case Opt_acdirmax:
c5cb09b6 1314 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1315 goto out_invalid_value;
1316 mnt->acdirmax = option;
bf0fd768
CL		 1317 break;
1318 case Opt_actimeo:
c5cb09b6 1319 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1320 goto out_invalid_value;
1321 mnt->acregmin = mnt->acregmax =
1322 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1323 break;
1324 case Opt_namelen:
c5cb09b6 1325 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1326 goto out_invalid_value;
1327 mnt->namlen = option;
bf0fd768
CL		 1328 break;
1329 case Opt_mountport:
c5cb09b6
RL		 1330 if (nfs_get_option_ul(args, &option) ||
1331 option > USHRT_MAX)
d23c45fd
CL		 1332 goto out_invalid_value;
1333 mnt->mount_server.port = option;
bf0fd768 1334 break;
bf0fd768 1335 case Opt_mountvers:
c5cb09b6 1336 if (nfs_get_option_ul(args, &option) ||
f45663ce 1337 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1338 option > NFS_MNT3_VERSION)
1339 goto out_invalid_value;
1340 mnt->mount_server.version = option;
bf0fd768 1341 break;
3fd5be9e 1342 case Opt_minorversion:
c5cb09b6 1343 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1344 goto out_invalid_value;
1345 if (option > NFS4_MAX_MINOR_VERSION)
1346 goto out_invalid_value;
1347 mnt->minorversion = option;
3fd5be9e 1348 break;
bf0fd768 1349
f45663ce
CL		 1350 /*
1351 * options that take text values
1352 */
0d71b058
TM		 1353 case Opt_nfsvers:
1354 string = match_strdup(args);
1355 if (string == NULL)
1356 goto out_nomem;
1357 rc = nfs_parse_version_string(string, mnt, args);
1358 kfree(string);
1359 if (!rc)
1360 goto out_invalid_value;
1361 break;
bf0fd768
CL		 1362 case Opt_sec:
1363 string = match_strdup(args);
1364 if (string == NULL)
1365 goto out_nomem;
01060c89 1366 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1367 kfree(string);
f45663ce 1368 if (!rc) {
f45663ce
CL		 1369 dfprintk(MOUNT, "NFS: unrecognized "
1370 "security flavor\n");
d23c45fd 1371 return 0;
f45663ce 1372 }
bf0fd768
CL		 1373 break;
1374 case Opt_proto:
1375 string = match_strdup(args);
1376 if (string == NULL)
1377 goto out_nomem;
1378 token = match_token(string,
1379 nfs_xprt_protocol_tokens, args);
bf0fd768 1380
ee671b01 1381 protofamily = AF_INET;
bf0fd768 1382 switch (token) {
ee671b01
JL		 1383 case Opt_xprt_udp6:
1384 protofamily = AF_INET6;
fdb66ff4 1385 case Opt_xprt_udp:
bf0fd768 1386 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1387 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1388 break;
ee671b01
JL		 1389 case Opt_xprt_tcp6:
1390 protofamily = AF_INET6;
fdb66ff4 1391 case Opt_xprt_tcp:
bf0fd768 1392 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1393 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1394 break;
2cf7ff7a
TT		 1395 case Opt_xprt_rdma:
1396 /* vector side protocols to TCP */
1397 mnt->flags |= NFS_MOUNT_TCP;
1398 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1399 xprt_load_transport(string);
2cf7ff7a 1400 break;
bf0fd768 1401 default:
f45663ce
CL		 1402 dfprintk(MOUNT, "NFS: unrecognized "
1403 "transport protocol\n");
4223a4a1 1404 kfree(string);
d23c45fd 1405 return 0;
bf0fd768 1406 }
c5cb09b6 1407 kfree(string);
bf0fd768
CL		 1408 break;
1409 case Opt_mountproto:
1410 string = match_strdup(args);
1411 if (string == NULL)
1412 goto out_nomem;
1413 token = match_token(string,
1414 nfs_xprt_protocol_tokens, args);
d508afb4 1415 kfree(string);
bf0fd768 1416
ee671b01 1417 mountfamily = AF_INET;
bf0fd768 1418 switch (token) {
ee671b01
JL		 1419 case Opt_xprt_udp6:
1420 mountfamily = AF_INET6;
fdb66ff4 1421 case Opt_xprt_udp:
0896a725 1422 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1423 break;
ee671b01
JL		 1424 case Opt_xprt_tcp6:
1425 mountfamily = AF_INET6;
fdb66ff4 1426 case Opt_xprt_tcp:
0896a725 1427 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1428 break;
2cf7ff7a 1429 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1430 default:
f45663ce
CL		 1431 dfprintk(MOUNT, "NFS: unrecognized "
1432 "transport protocol\n");
d23c45fd 1433 return 0;
bf0fd768
CL		 1434 }
1435 break;
1436 case Opt_addr:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
53a0b9c4 1440 mnt->nfs_server.addrlen =
b48e1278 1441 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1442 (struct sockaddr *)
1443 &mnt->nfs_server.address,
1444 sizeof(mnt->nfs_server.address));
bf0fd768 1445 kfree(string);
53a0b9c4
CL		 1446 if (mnt->nfs_server.addrlen == 0)
1447 goto out_invalid_address;
bf0fd768
CL		 1448 break;
1449 case Opt_clientaddr:
c5cb09b6 1450 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1451 goto out_nomem;
bf0fd768 1452 break;
33832034 1453 case Opt_mounthost:
c5cb09b6
RL		 1454 if (nfs_get_option_str(args,
1455 &mnt->mount_server.hostname))
33832034 1456 goto out_nomem;
33832034 1457 break;
0ac83779 1458 case Opt_mountaddr:
bf0fd768
CL		 1459 string = match_strdup(args);
1460 if (string == NULL)
1461 goto out_nomem;
53a0b9c4 1462 mnt->mount_server.addrlen =
b48e1278 1463 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1464 (struct sockaddr *)
1465 &mnt->mount_server.address,
1466 sizeof(mnt->mount_server.address));
bf0fd768 1467 kfree(string);
53a0b9c4
CL		 1468 if (mnt->mount_server.addrlen == 0)
1469 goto out_invalid_address;
bf0fd768 1470 break;
7973c1f1
TM		 1471 case Opt_lookupcache:
1472 string = match_strdup(args);
1473 if (string == NULL)
1474 goto out_nomem;
1475 token = match_token(string,
1476 nfs_lookupcache_tokens, args);
1477 kfree(string);
1478 switch (token) {
1479 case Opt_lookupcache_all:
1480 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1481 break;
1482 case Opt_lookupcache_positive:
1483 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1484 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1485 break;
1486 case Opt_lookupcache_none:
1487 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1488 break;
1489 default:
7973c1f1
TM		 1490 dfprintk(MOUNT, "NFS: invalid "
1491 "lookupcache argument\n");
d23c45fd 1492 return 0;
7973c1f1
TM		 1493 };
1494 break;
a6d5ff64 1495 case Opt_fscache_uniq:
c5cb09b6 1496 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1497 goto out_nomem;
a6d5ff64
CL		 1498 mnt->options |= NFS_OPTION_FSCACHE;
1499 break;
5eebde23
SJ		 1500 case Opt_local_lock:
1501 string = match_strdup(args);
1502 if (string == NULL)
1503 goto out_nomem;
1504 token = match_token(string, nfs_local_lock_tokens,
1505 args);
1506 kfree(string);
1507 switch (token) {
1508 case Opt_local_lock_all:
1509 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1510 NFS_MOUNT_LOCAL_FCNTL);
1511 break;
1512 case Opt_local_lock_flock:
1513 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1514 break;
1515 case Opt_local_lock_posix:
1516 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1517 break;
1518 case Opt_local_lock_none:
1519 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1520 NFS_MOUNT_LOCAL_FCNTL);
1521 break;
1522 default:
1523 dfprintk(MOUNT, "NFS: invalid "
1524 "local_lock argument\n");
1525 return 0;
1526 };
1527 break;
bf0fd768 1528
f45663ce
CL		 1529 /*
1530 * Special options
1531 */
1532 case Opt_sloppy:
1533 sloppy = 1;
1534 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1535 break;
bf0fd768
CL		 1536 case Opt_userspace:
1537 case Opt_deprecated:
d33e4dfe
CL		 1538 dfprintk(MOUNT, "NFS: ignoring mount option "
1539 "'%s'\n", p);
bf0fd768
CL		 1540 break;
1541
1542 default:
d23c45fd 1543 invalid_option = 1;
f45663ce
CL		 1544 dfprintk(MOUNT, "NFS: unrecognized mount option "
1545 "'%s'\n", p);
bf0fd768
CL		 1546 }
1547 }
1548
d23c45fd
CL		 1549 if (!sloppy && invalid_option)
1550 return 0;
1551
571b7554
WAA		 1552 if (mnt->minorversion && mnt->version != 4)
1553 goto out_minorversion_mismatch;
1554
89652617
CL		 1555 if (mnt->options & NFS_OPTION_MIGRATION &&
1556 mnt->version != 4 && mnt->minorversion != 0)
1557 goto out_migration_misuse;
1558
ee671b01
JL		 1559 /*
1560 * verify that any proto=/mountproto= options match the address
1856b225 1561 * families in the addr=/mountaddr= options.
ee671b01
JL		 1562 */
1563 if (protofamily != AF_UNSPEC &&
1564 protofamily != mnt->nfs_server.address.ss_family)
1565 goto out_proto_mismatch;
1566
1567 if (mountfamily != AF_UNSPEC) {
1568 if (mnt->mount_server.addrlen) {
1569 if (mountfamily != mnt->mount_server.address.ss_family)
1570 goto out_mountproto_mismatch;
1571 } else {
1572 if (mountfamily != mnt->nfs_server.address.ss_family)
1573 goto out_mountproto_mismatch;
1574 }
1575 }
1576
bf0fd768
CL		 1577 return 1;
1578
ee671b01
JL		 1579out_mountproto_mismatch:
1580 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1581 "option\n");
1582 return 0;
1583out_proto_mismatch:
1584 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1585 return 0;
53a0b9c4
CL		 1586out_invalid_address:
1587 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1588 return 0;
d23c45fd 1589out_invalid_value:
53a0b9c4 1590 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1591 return 0;
571b7554
WAA		 1592out_minorversion_mismatch:
1593 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1594 "minorversion=%u\n", mnt->version, mnt->minorversion);
1595 return 0;
89652617
CL		 1596out_migration_misuse:
1597 printk(KERN_INFO
1598 "NFS: 'migration' not supported for this NFS version\n");
1599 return 0;
bf0fd768
CL		 1600out_nomem:
1601 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1602 return 0;
f9c3a380
EP		 1603out_security_failure:
1604 free_secdata(secdata);
1605 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1606 return 0;
bf0fd768
CL		 1607}
1608
ec88f28d
CL		 1609/*
1610 * Match the requested auth flavors with the list returned by
1611 * the server. Returns zero and sets the mount's authentication
1612 * flavor on success; returns -EACCES if server does not support
1613 * the requested flavor.
1614 */
1615static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1616 struct nfs_mount_request *request)
1617{
1618 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1619
5eecfde6
CL		 1620 /*
1621 * Certain releases of Linux's mountd return an empty
1622 * flavor list. To prevent behavioral regression with
1623 * these servers (ie. rejecting mounts that used to
1624 * succeed), revert to pre-2.6.32 behavior (no checking)
1625 * if the returned flavor list is empty.
1626 */
1627 if (server_authlist_len == 0)
1628 return 0;
1629
ec88f28d
CL		 1630 /*
1631 * We avoid sophisticated negotiating here, as there are
1632 * plenty of cases where we can get it wrong, providing
1633 * either too little or too much security.
1634 *
1635 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1636 * flavor listed first. However, some servers list
1637 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1638 * preferred default, in args->auth_flavors[0] if user
1639 * didn't specify sec= mount option.
1640 */
1641 for (i = 0; i < args->auth_flavor_len; i++)
1642 for (j = 0; j < server_authlist_len; j++)
1643 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1644 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1645 request->auth_flavs[j]);
1646 args->auth_flavors[0] = request->auth_flavs[j];
1647 return 0;
1648 }
1649
1650 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1651 nfs_umount(request);
1652 return -EACCES;
1653}
1654
0076d7b7
CL		 1655/*
1656 * Use the remote server's MOUNT service to request the NFS file handle
1657 * corresponding to the provided path.
1658 */
486aa699
BS		 1659static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1660 struct nfs_fh *root_fh)
0076d7b7 1661{
ec88f28d
CL		 1662 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1663 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1664 struct nfs_mount_request request = {
1665 .sap = (struct sockaddr *)
1666 &args->mount_server.address,
1667 .dirpath = args->nfs_server.export_path,
1668 .protocol = args->mount_server.protocol,
1669 .fh = root_fh,
50a737f8 1670 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1671 .auth_flav_len = &server_authlist_len,
1672 .auth_flavs = server_authlist,
6d59b8d5 1673 .net = args->net,
c5d120f8 1674 };
4c568017 1675 int status;
0076d7b7
CL		 1676
1677 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1678 switch (args->version) {
1679 default:
1680 args->mount_server.version = NFS_MNT3_VERSION;
1681 break;
1682 case 2:
1683 args->mount_server.version = NFS_MNT_VERSION;
1684 }
0076d7b7 1685 }
c5d120f8 1686 request.version = args->mount_server.version;
0076d7b7 1687
33832034 1688 if (args->mount_server.hostname)
c5d120f8 1689 request.hostname = args->mount_server.hostname;
33832034 1690 else
c5d120f8 1691 request.hostname = args->nfs_server.hostname;
33832034 1692
0076d7b7
CL		 1693 /*
1694 * Construct the mount server's address.
1695 */
4c568017 1696 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1697 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1698 args->nfs_server.addrlen);
1699 args->mount_server.addrlen = args->nfs_server.addrlen;
1700 }
c5d120f8 1701 request.salen = args->mount_server.addrlen;
f5855fec 1702 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1703
1704 /*
1705 * Now ask the mount server to map our export path
1706 * to a file handle.
1707 */
c5d120f8 1708 status = nfs_mount(&request);
ec88f28d
CL		 1709 if (status != 0) {
1710 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1711 request.hostname, status);
1712 return status;
1713 }
0076d7b7 1714
ec88f28d
CL		 1715 /*
1716 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1717 */
1718 if (args->mount_server.version != NFS_MNT3_VERSION)
1719 return 0;
1720 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1721}
1722
ff9099f2
BS		 1723struct dentry *nfs_try_mount(int flags, const char *dev_name,
1724 struct nfs_mount_info *mount_info,
1725 struct nfs_subversion *nfs_mod)
486aa699
BS		 1726{
1727 int status;
1728 struct nfs_server *server;
1729
b72e4f42 1730 if (mount_info->parsed->need_mount) {
87c7083d 1731 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1732 if (status)
1733 return ERR_PTR(status);
1734 }
486aa699
BS		 1735
1736 /* Get a volume representation */
1179acc6 1737 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699
BS		 1738 if (IS_ERR(server))
1739 return ERR_CAST(server);
1740
ab7017a3 1741 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1742}
ddda8e0a 1743EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1744
c12bacec
RL		 1745/*
1746 * Split "dev_name" into "hostname:export_path".
1747 *
1748 * The leftmost colon demarks the split between the server's hostname
1749 * and the export path. If the hostname starts with a left square
1750 * bracket, then it may contain colons.
1751 *
1752 * Note: caller frees hostname and export path, even on error.
1753 */
1754static int nfs_parse_devname(const char *dev_name,
1755 char **hostname, size_t maxnamlen,
1756 char **export_path, size_t maxpathlen)
dc045898
CL		 1757{
1758 size_t len;
c12bacec 1759 char *end;
dc045898 1760
c12bacec
RL		 1761 /* Is the host name protected with square brakcets? */
1762 if (*dev_name == '[') {
1763 end = strchr(++dev_name, ']');
1764 if (end == NULL || end[1] != ':')
dc045898 1765 goto out_bad_devname;
dc045898 1766
c12bacec
RL		 1767 len = end - dev_name;
1768 end++;
1769 } else {
1770 char *comma;
dc045898 1771
c12bacec
RL		 1772 end = strchr(dev_name, ':');
1773 if (end == NULL)
1774 goto out_bad_devname;
1775 len = end - dev_name;
d1aa0825 1776
c12bacec
RL		 1777 /* kill possible hostname list: not supported */
1778 comma = strchr(dev_name, ',');
1779 if (comma != NULL && comma < end)
1780 *comma = 0;
1781 }
d1aa0825 1782
d1aa0825
CL		 1783 if (len > maxnamlen)
1784 goto out_hostname;
1785
1786 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1787 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1788 if (*hostname == NULL)
1789 goto out_nomem;
c12bacec 1790 len = strlen(++end);
d1aa0825
CL		 1791 if (len > maxpathlen)
1792 goto out_path;
1793 *export_path = kstrndup(end, len, GFP_KERNEL);
1794 if (!*export_path)
1795 goto out_nomem;
1796
c12bacec 1797 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1798 return 0;
1799
1800out_bad_devname:
1801 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1802 return -EINVAL;
1803
1804out_nomem:
1805 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1806 return -ENOMEM;
1807
1808out_hostname:
1809 dfprintk(MOUNT, "NFS: server hostname too long\n");
1810 return -ENAMETOOLONG;
1811
1812out_path:
1813 dfprintk(MOUNT, "NFS: export pathname too long\n");
1814 return -ENAMETOOLONG;
1815}
1816
f7b422b1 1817/*
54ceac45
DH		 1818 * Validate the NFS2/NFS3 mount data
1819 * - fills in the mount root filehandle
136d558c
CL		 1820 *
1821 * For option strings, user space handles the following behaviors:
1822 *
1823 * + DNS: mapping server host name to IP address ("addr=" option)
1824 *
1825 * + failure mode: how to behave if a mount request can't be handled
1826 * immediately ("fg/bg" option)
1827 *
1828 * + retry: how often to retry a mount request ("retry=" option)
1829 *
1830 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1831 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1832 */
d72c727c
BS		 1833static int nfs23_validate_mount_data(void *options,
1834 struct nfs_parsed_mount_data *args,
1835 struct nfs_fh *mntfh,
1836 const char *dev_name)
f7b422b1 1837{
2283f8d6 1838 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1839 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1840
5df36e78
CL		 1841 if (data == NULL)
1842 goto out_no_data;
f7b422b1 1843
c5afc8da 1844 args->version = NFS_DEFAULT_VERSION;
54ceac45 1845 switch (data->version) {
5df36e78
CL		 1846 case 1:
1847 data->namlen = 0;
1848 case 2:
1849 data->bsize = 0;
1850 case 3:
1851 if (data->flags & NFS_MOUNT_VER3)
1852 goto out_no_v3;
1853 data->root.size = NFS2_FHSIZE;
1854 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1855 case 4:
1856 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1857 goto out_no_sec;
1858 case 5:
1859 memset(data->context, 0, sizeof(data->context));
1860 case 6:
b7e24457
TM		 1861 if (data->flags & NFS_MOUNT_VER3) {
1862 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1863 goto out_invalid_fh;
5df36e78 1864 mntfh->size = data->root.size;
764302cc
CL		 1865 args->version = 3;
1866 } else {
5df36e78 1867 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1868 args->version = 2;
1869 }
5df36e78 1870
5df36e78
CL		 1871
1872 memcpy(mntfh->data, data->root.data, mntfh->size);
1873 if (mntfh->size < sizeof(mntfh->data))
1874 memset(mntfh->data + mntfh->size, 0,
1875 sizeof(mntfh->data) - mntfh->size);
6e88e061 1876
2283f8d6
TT		 1877 /*
1878 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1879 * can deal with.
1880 */
ff3525a5 1881 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1882 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1883 args->rsize = data->rsize;
1884 args->wsize = data->wsize;
2283f8d6
TT		 1885 args->timeo = data->timeo;
1886 args->retrans = data->retrans;
1887 args->acregmin = data->acregmin;
1888 args->acregmax = data->acregmax;
1889 args->acdirmin = data->acdirmin;
1890 args->acdirmax = data->acdirmax;
b72e4f42 1891 args->need_mount = false;
4c568017 1892
4cfd74fc 1893 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1894 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 1895 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 1896 if (!nfs_verify_server_address(sap))
4c568017
CL		 1897 goto out_no_address;
1898
2283f8d6 1899 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1900 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1901 /* N.B. caller will free nfs_server.hostname in all cases */
1902 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1903 args->namlen = data->namlen;
1904 args->bsize = data->bsize;
dd07c947
CL		 1905
1906 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1907 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1908 if (!args->nfs_server.hostname)
1909 goto out_nomem;
f9c3a380 1910
5eebde23
SJ		 1911 if (!(data->flags & NFS_MOUNT_NONLM))
1912 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1913 NFS_MOUNT_LOCAL_FCNTL);
1914 else
1915 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1916 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1917 /*
1918 * The legacy version 6 binary mount data from userspace has a
1919 * field used only to transport selinux information into the
1920 * the kernel. To continue to support that functionality we
1921 * have a touch of selinux knowledge here in the NFS code. The
1922 * userspace code converted context=blah to just blah so we are
1923 * converting back to the full string selinux understands.
1924 */
1925 if (data->context[0]){
1926#ifdef CONFIG_SECURITY_SELINUX
1927 int rc;
1928 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1929 if (!opts_str)
1930 return -ENOMEM;
1931 strcpy(opts_str, "context=");
1932 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1933 strcat(opts_str, &data->context[0]);
1934 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1935 kfree(opts_str);
1936 if (rc)
1937 return rc;
1938#else
1939 return -EINVAL;
1940#endif
1941 }
1942
5df36e78 1943 break;
b72e4f42
BS		 1944 default:
1945 return NFS_TEXT_DATA;
f7b422b1 1946 }
54ceac45 1947
1c606fb7 1948#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 1949 if (args->version == 3)
5df36e78
CL		 1950 goto out_v3_not_compiled;
1951#endif /* !CONFIG_NFS_V3 */
f7b422b1 1952
5df36e78 1953 return 0;
f7b422b1 1954
5df36e78
CL		 1955out_no_data:
1956 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1957 return -EINVAL;
54ceac45 1958
5df36e78
CL		 1959out_no_v3:
1960 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1961 data->version);
1962 return -EINVAL;
f7b422b1 1963
5df36e78
CL		 1964out_no_sec:
1965 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1966 return -EINVAL;
1967
1c606fb7 1968#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 1969out_v3_not_compiled:
1970 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1971 return -EPROTONOSUPPORT;
1972#endif /* !CONFIG_NFS_V3 */
1973
63649bd7
CG		 1974out_nomem:
1975 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1976 return -ENOMEM;
1977
5df36e78
CL		 1978out_no_address:
1979 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1980 return -EINVAL;
1981
1982out_invalid_fh:
1983 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1984 return -EINVAL;
f7b422b1
DH		 1985}
1986
89d77c8f 1987#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 1988static int nfs_validate_mount_data(struct file_system_type *fs_type,
1989 void *options,
1990 struct nfs_parsed_mount_data *args,
1991 struct nfs_fh *mntfh,
1992 const char *dev_name)
1993{
1994 if (fs_type == &nfs_fs_type)
1995 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1996 return nfs4_validate_mount_data(options, args, dev_name);
1997}
1998#else
1999static int nfs_validate_mount_data(struct file_system_type *fs_type,
2000 void *options,
2001 struct nfs_parsed_mount_data *args,
2002 struct nfs_fh *mntfh,
2003 const char *dev_name)
2004{
2005 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2006}
2007#endif
2008
b72e4f42
BS		 2009static int nfs_validate_text_mount_data(void *options,
2010 struct nfs_parsed_mount_data *args,
2011 const char *dev_name)
2012{
2013 int port = 0;
2014 int max_namelen = PAGE_SIZE;
2015 int max_pathlen = NFS_MAXPATHLEN;
2016 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2017
2018 if (nfs_parse_mount_options((char *)options, args) == 0)
2019 return -EINVAL;
2020
2021 if (!nfs_verify_server_address(sap))
2022 goto out_no_address;
2023
2024 if (args->version == 4) {
89d77c8f 2025#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2026 port = NFS_PORT;
2027 max_namelen = NFS4_MAXNAMLEN;
2028 max_pathlen = NFS4_MAXPATHLEN;
2029 nfs_validate_transport_protocol(args);
2030 nfs4_validate_mount_flags(args);
2031#else
2032 goto out_v4_not_compiled;
2033#endif /* CONFIG_NFS_V4 */
2034 } else
2035 nfs_set_mount_transport_protocol(args);
2036
2037 nfs_set_port(sap, &args->nfs_server.port, port);
2038
2039 if (args->auth_flavor_len > 1)
2040 goto out_bad_auth;
2041
2042 return nfs_parse_devname(dev_name,
2043 &args->nfs_server.hostname,
2044 max_namelen,
2045 &args->nfs_server.export_path,
2046 max_pathlen);
2047
89d77c8f 2048#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2049out_v4_not_compiled:
2050 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2051 return -EPROTONOSUPPORT;
2052#endif /* !CONFIG_NFS_V4 */
2053
2054out_no_address:
2055 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2056 return -EINVAL;
2057
2058out_bad_auth:
2059 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2060 return -EINVAL;
2061}
2062
48b605f8
JL		 2063static int
2064nfs_compare_remount_data(struct nfs_server *nfss,
2065 struct nfs_parsed_mount_data *data)
2066{
2067 if (data->flags != nfss->flags ||
2068 data->rsize != nfss->rsize ||
2069 data->wsize != nfss->wsize ||
2070 data->retrans != nfss->client->cl_timeout->to_retries ||
2071 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2072 data->acregmin != nfss->acregmin / HZ ||
2073 data->acregmax != nfss->acregmax / HZ ||
2074 data->acdirmin != nfss->acdirmin / HZ ||
2075 data->acdirmax != nfss->acdirmax / HZ ||
2076 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2077 data->nfs_server.port != nfss->port ||
48b605f8 2078 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2079 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2080 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2081 return -EINVAL;
2082
2083 return 0;
2084}
2085
fbdefd64 2086int
48b605f8
JL		 2087nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2088{
2089 int error;
2090 struct nfs_server *nfss = sb->s_fs_info;
2091 struct nfs_parsed_mount_data *data;
2092 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2093 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2094 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2095
2096 /*
2097 * Userspace mount programs that send binary options generally send
2098 * them populated with default values. We have no way to know which
2099 * ones were explicitly specified. Fall back to legacy behavior and
2100 * just return success.
2101 */
31c94469
MZ		 2102 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2103 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2104 options->version <= 6))))
48b605f8
JL		 2105 return 0;
2106
2107 data = kzalloc(sizeof(*data), GFP_KERNEL);
2108 if (data == NULL)
2109 return -ENOMEM;
2110
2111 /* fill out struct with values from existing mount */
2112 data->flags = nfss->flags;
2113 data->rsize = nfss->rsize;
2114 data->wsize = nfss->wsize;
2115 data->retrans = nfss->client->cl_timeout->to_retries;
2116 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2117 data->acregmin = nfss->acregmin / HZ;
2118 data->acregmax = nfss->acregmax / HZ;
2119 data->acdirmin = nfss->acdirmin / HZ;
2120 data->acdirmax = nfss->acdirmax / HZ;
2121 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2122 data->nfs_server.port = nfss->port;
48b605f8
JL		 2123 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2124 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2125 data->nfs_server.addrlen);
2126
2127 /* overwrite those values with any that were specified */
2128 error = nfs_parse_mount_options((char *)options, data);
2129 if (error < 0)
2130 goto out;
2131
26c4c170
JL		 2132 /*
2133 * noac is a special case. It implies -o sync, but that's not
2134 * necessarily reflected in the mtab options. do_remount_sb
2135 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2136 * remount options, so we have to explicitly reset it.
2137 */
2138 if (data->flags & NFS_MOUNT_NOAC)
2139 *flags |= MS_SYNCHRONOUS;
2140
48b605f8
JL		 2141 /* compare new mount options with old ones */
2142 error = nfs_compare_remount_data(nfss, data);
2143out:
2144 kfree(data);
2145 return error;
2146}
89d77c8f 2147EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2148
f7b422b1 2149/*
54ceac45 2150 * Initialise the common bits of the superblock
f7b422b1 2151 */
fbdefd64 2152inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2153{
54ceac45 2154 struct nfs_server *server = NFS_SB(sb);
5006a76c 2155
54ceac45 2156 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2157
54ceac45
DH		 2158 /* We probably want something more informative here */
2159 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2160 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2161
54ceac45
DH		 2162 if (sb->s_blocksize == 0)
2163 sb->s_blocksize = nfs_block_bits(server->wsize,
2164 &sb->s_blocksize_bits);
f7b422b1 2165
32a88aa1
JA		 2166 sb->s_bdi = &server->backing_dev_info;
2167
54ceac45 2168 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2169}
2170
2171/*
54ceac45 2172 * Finish setting up an NFS2/3 superblock
f7b422b1 2173 */
fbdefd64 2174void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2175{
c40f8d1d 2176 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2177 struct nfs_server *server = NFS_SB(sb);
5006a76c 2178
54ceac45
DH		 2179 sb->s_blocksize_bits = 0;
2180 sb->s_blocksize = 0;
6a74490d
BS		 2181 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2182 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2183 if (data && data->bsize)
54ceac45 2184 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2185
6a74490d 2186 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2187 /* The VFS shouldn't apply the umask to mode bits. We will do
2188 * so ourselves when necessary.
2189 */
2190 sb->s_flags |= MS_POSIXACL;
2191 sb->s_time_gran = 1;
816724e6 2192 }
54ceac45 2193
54ceac45 2194 nfs_initialise_sb(sb);
f7b422b1 2195}
89d77c8f 2196EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2197
2198/*
3cadf4b8 2199 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2200 */
fbdefd64 2201void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2202{
8c958e0c 2203 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2204 struct nfs_server *server = NFS_SB(sb);
2205
2206 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2207 sb->s_blocksize = old_sb->s_blocksize;
2208 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2209 sb->s_xattr = old_sb->s_xattr;
2210 sb->s_op = old_sb->s_op;
2211 sb->s_time_gran = 1;
f7b422b1 2212
3cadf4b8 2213 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2214 /* The VFS shouldn't apply the umask to mode bits. We will do
2215 * so ourselves when necessary.
f7b422b1
DH		 2216 */
2217 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2218 }
2219
54ceac45 2220 nfs_initialise_sb(sb);
f7b422b1
DH		 2221}
2222
275a5d24
TM		 2223static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2224{
2225 const struct nfs_server *a = s->s_fs_info;
2226 const struct rpc_clnt *clnt_a = a->client;
2227 const struct rpc_clnt *clnt_b = b->client;
2228
2229 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2230 goto Ebusy;
2231 if (a->nfs_client != b->nfs_client)
2232 goto Ebusy;
2233 if (a->flags != b->flags)
2234 goto Ebusy;
2235 if (a->wsize != b->wsize)
2236 goto Ebusy;
2237 if (a->rsize != b->rsize)
2238 goto Ebusy;
2239 if (a->acregmin != b->acregmin)
2240 goto Ebusy;
2241 if (a->acregmax != b->acregmax)
2242 goto Ebusy;
2243 if (a->acdirmin != b->acdirmin)
2244 goto Ebusy;
2245 if (a->acdirmax != b->acdirmax)
2246 goto Ebusy;
2247 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2248 goto Ebusy;
e89a5a43 2249 return 1;
275a5d24 2250Ebusy:
e89a5a43
TM		 2251 return 0;
2252}
2253
2254struct nfs_sb_mountdata {
2255 struct nfs_server *server;
2256 int mntflags;
2257};
2258
2259static int nfs_set_super(struct super_block *s, void *data)
2260{
2261 struct nfs_sb_mountdata *sb_mntdata = data;
2262 struct nfs_server *server = sb_mntdata->server;
2263 int ret;
2264
2265 s->s_flags = sb_mntdata->mntflags;
2266 s->s_fs_info = server;
8b244ff2 2267 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2268 ret = set_anon_super(s, server);
2269 if (ret == 0)
2270 server->s_dev = s->s_dev;
2271 return ret;
2272}
2273
fd00a8ff
CL		 2274static int nfs_compare_super_address(struct nfs_server *server1,
2275 struct nfs_server *server2)
2276{
2277 struct sockaddr *sap1, *sap2;
2278
2279 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2280 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2281
2282 if (sap1->sa_family != sap2->sa_family)
2283 return 0;
2284
2285 switch (sap1->sa_family) {
2286 case AF_INET: {
2287 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2288 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2289 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2290 return 0;
2291 if (sin1->sin_port != sin2->sin_port)
2292 return 0;
2293 break;
2294 }
2295 case AF_INET6: {
2296 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2297 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2298 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2299 return 0;
2300 if (sin1->sin6_port != sin2->sin6_port)
2301 return 0;
2302 break;
2303 }
2304 default:
2305 return 0;
2306 }
2307
2308 return 1;
2309}
2310
e89a5a43
TM		 2311static int nfs_compare_super(struct super_block *sb, void *data)
2312{
2313 struct nfs_sb_mountdata *sb_mntdata = data;
2314 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2315 int mntflags = sb_mntdata->mntflags;
2316
fd00a8ff 2317 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2318 return 0;
2319 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2320 if (old->flags & NFS_MOUNT_UNSHARED)
2321 return 0;
2322 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2323 return 0;
2324 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2325}
2326
39ffb921 2327#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2328static void nfs_get_cache_cookie(struct super_block *sb,
2329 struct nfs_parsed_mount_data *parsed,
2330 struct nfs_clone_mount *cloned)
2331{
c4271c6e 2332 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2333 char *uniq = NULL;
2334 int ulen = 0;
2335
c4271c6e
TM		 2336 nfss->fscache_key = NULL;
2337 nfss->fscache = NULL;
2338
2339 if (parsed) {
2340 if (!(parsed->options & NFS_OPTION_FSCACHE))
2341 return;
2342 if (parsed->fscache_uniq) {
2343 uniq = parsed->fscache_uniq;
2344 ulen = strlen(parsed->fscache_uniq);
2345 }
2311b943
BS		 2346 } else if (cloned) {
2347 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2348 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2349 return;
2311b943
BS		 2350 if (mnt_s->fscache_key) {
2351 uniq = mnt_s->fscache_key->key.uniquifier;
2352 ulen = mnt_s->fscache_key->key.uniq_len;
2353 };
c4271c6e
TM		 2354 } else
2355 return;
2311b943
BS		 2356
2357 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2358}
39ffb921
TM		 2359#else
2360static void nfs_get_cache_cookie(struct super_block *sb,
2361 struct nfs_parsed_mount_data *parsed,
2362 struct nfs_clone_mount *cloned)
2363{
2364}
2365#endif
2311b943 2366
fa799759
MS		 2367static int nfs_bdi_register(struct nfs_server *server)
2368{
2369 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2370}
2371
fbdefd64
BS		 2372int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2373 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2374{
2375 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2376}
89d77c8f 2377EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2378
fbdefd64
BS		 2379int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2380 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2381{
2382 /* clone any lsm security options from the parent to the new sb */
2383 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2384 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2385 return -ESTALE;
2386 return 0;
2387}
89d77c8f 2388EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2389
ab7017a3 2390struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2391 int flags, const char *dev_name,
ab7017a3
BS		 2392 struct nfs_mount_info *mount_info,
2393 struct nfs_subversion *nfs_mod)
f7b422b1 2394{
f7b422b1 2395 struct super_block *s;
01194981 2396 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2397 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2398 struct nfs_sb_mountdata sb_mntdata = {
2399 .mntflags = flags,
c40f8d1d 2400 .server = server,
e89a5a43 2401 };
01194981 2402 int error;
33852a1f 2403
75180df2
TM		 2404 if (server->flags & NFS_MOUNT_UNSHARED)
2405 compare_super = NULL;
2406
fb2088cc
SP		 2407 /* -o noac implies -o sync */
2408 if (server->flags & NFS_MOUNT_NOAC)
2409 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2410
54ceac45 2411 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2412 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2413 if (IS_ERR(s)) {
01194981 2414 mntroot = ERR_CAST(s);
54ceac45 2415 goto out_err_nosb;
816724e6
TM		 2416 }
2417
54ceac45
DH		 2418 if (s->s_fs_info != server) {
2419 nfs_free_server(server);
2420 server = NULL;
fa799759
MS		 2421 } else {
2422 error = nfs_bdi_register(server);
01194981
AV		 2423 if (error) {
2424 mntroot = ERR_PTR(error);
cfbc0683 2425 goto error_splat_bdi;
01194981 2426 }
54ceac45 2427 }
f7b422b1 2428
54ceac45
DH		 2429 if (!s->s_root) {
2430 /* initial superblock/root creation */
c40f8d1d 2431 mount_info->fill_super(s, mount_info);
3d176e3f 2432 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2433 }
f7b422b1 2434
87c7083d 2435 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2436 if (IS_ERR(mntroot))
54ceac45 2437 goto error_splat_super;
816724e6 2438
3d176e3f 2439 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2440 if (error)
2441 goto error_splat_root;
2442
54ceac45 2443 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2444
2445out:
01194981 2446 return mntroot;
816724e6 2447
54ceac45
DH		 2448out_err_nosb:
2449 nfs_free_server(server);
0655960f 2450 goto out;
54ceac45 2451
f9c3a380
EP		 2452error_splat_root:
2453 dput(mntroot);
01194981 2454 mntroot = ERR_PTR(error);
54ceac45 2455error_splat_super:
cfbc0683
N		 2456 if (server && !s->s_root)
2457 bdi_unregister(&server->backing_dev_info);
2458error_splat_bdi:
6f5bbff9 2459 deactivate_locked_super(s);
0655960f 2460 goto out;
f7b422b1 2461}
89d77c8f 2462EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2463
fbdefd64 2464struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2465 int flags, const char *dev_name, void *raw_data)
2466{
c40f8d1d
BS		 2467 struct nfs_mount_info mount_info = {
2468 .fill_super = nfs_fill_super,
3d176e3f 2469 .set_security = nfs_set_sb_security,
c40f8d1d 2470 };
c40f8d1d 2471 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2472 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2473 int error;
2474
46058d46 2475 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2476 mount_info.mntfh = nfs_alloc_fhandle();
2477 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2478 goto out;
2479
2480 /* Validate the mount data */
87c7083d 2481 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2482 if (error == NFS_TEXT_DATA)
46058d46 2483 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2484 if (error < 0) {
2485 mntroot = ERR_PTR(error);
2486 goto out;
2487 }
c40f8d1d 2488
ab7017a3
BS		 2489 nfs_mod = get_nfs_version(mount_info.parsed->version);
2490 if (IS_ERR(nfs_mod)) {
2491 mntroot = ERR_CAST(nfs_mod);
2492 goto out;
2493 }
2494
ff9099f2 2495 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2496
2497 put_nfs_version(nfs_mod);
c40f8d1d 2498out:
46058d46 2499 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2500 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2501 return mntroot;
2502}
89d77c8f 2503EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2504
387c149b
TM		 2505/*
2506 * Ensure that we unregister the bdi before kill_anon_super
2507 * releases the device name
2508 */
fbdefd64 2509void nfs_put_super(struct super_block *s)
387c149b
TM		 2510{
2511 struct nfs_server *server = NFS_SB(s);
2512
2513 bdi_unregister(&server->backing_dev_info);
2514}
89d77c8f 2515EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2516
54ceac45
DH		 2517/*
2518 * Destroy an NFS2/3 superblock
2519 */
fbdefd64 2520void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2521{
2522 struct nfs_server *server = NFS_SB(s);
2523
2524 kill_anon_super(s);
08734048 2525 nfs_fscache_release_super_cookie(s);
54ceac45 2526 nfs_free_server(server);
f7b422b1 2527}
89d77c8f 2528EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2529
54ceac45 2530/*
8c958e0c 2531 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2532 */
3dd4f8ef 2533static struct dentry *
e8f25e6d
BS		 2534nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2535 const char *dev_name, void *raw_data)
f7b422b1 2536{
e8f25e6d
BS		 2537 struct nfs_clone_mount *data = raw_data;
2538 struct nfs_mount_info mount_info = {
2539 .fill_super = nfs_clone_super,
2540 .set_security = nfs_clone_sb_security,
2541 .cloned = data,
2542 };
54ceac45 2543 struct nfs_server *server;
3d176e3f 2544 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2545 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
f7b422b1 2546
dee972b9 2547 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2548
e8f25e6d 2549 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2550
54ceac45 2551 /* create a new volume representation */
1179acc6 2552 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
f7b422b1 2553
dee972b9
TM		 2554 if (IS_ERR(server))
2555 mntroot = ERR_CAST(server);
2556 else
2557 mntroot = nfs_fs_mount_common(server, flags,
2558 dev_name, &mount_info, nfs_mod);
24c8dbbb 2559
dee972b9
TM		 2560 dprintk("<-- nfs_xdev_mount() = %ld\n",
2561 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2562 return mntroot;
f7b422b1
DH		 2563}
2564
89d77c8f 2565#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2566
01c3f052
TM		 2567static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2568{
5eebde23
SJ		 2569 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2570 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2571}
2572
f0768ebd
CL		 2573/*
2574 * Validate NFSv4 mount options
2575 */
91ea40b9
TT		 2576static int nfs4_validate_mount_data(void *options,
2577 struct nfs_parsed_mount_data *args,
2578 const char *dev_name)
f0768ebd 2579{
4cfd74fc 2580 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2581 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2582 char *c;
2583
2584 if (data == NULL)
2585 goto out_no_data;
2586
cdf66442
BS		 2587 args->version = 4;
2588
f0768ebd
CL		 2589 switch (data->version) {
2590 case 1:
4c568017
CL		 2591 if (data->host_addrlen > sizeof(args->nfs_server.address))
2592 goto out_no_address;
2593 if (data->host_addrlen == 0)
f0768ebd 2594 goto out_no_address;
4c568017 2595 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2596 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2597 return -EFAULT;
4cfd74fc 2598 if (!nfs_verify_server_address(sap))
f0768ebd 2599 goto out_no_address;
872ece86 2600 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2601
6738b251
CL		 2602 if (data->auth_flavourlen) {
2603 if (data->auth_flavourlen > 1)
2604 goto out_inval_auth;
20c71f5e 2605 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2606 data->auth_flavours,
20c71f5e 2607 sizeof(args->auth_flavors[0])))
f0768ebd 2608 return -EFAULT;
f0768ebd
CL		 2609 }
2610
2611 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2612 if (IS_ERR(c))
2613 return PTR_ERR(c);
91ea40b9 2614 args->nfs_server.hostname = c;
f0768ebd
CL		 2615
2616 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2617 if (IS_ERR(c))
2618 return PTR_ERR(c);
91ea40b9
TT		 2619 args->nfs_server.export_path = c;
2620 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2621
2622 c = strndup_user(data->client_addr.data, 16);
2623 if (IS_ERR(c))
2624 return PTR_ERR(c);
91ea40b9
TT		 2625 args->client_address = c;
2626
2627 /*
2628 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2629 * can deal with.
2630 */
2631
2632 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2633 args->rsize = data->rsize;
2634 args->wsize = data->wsize;
2635 args->timeo = data->timeo;
2636 args->retrans = data->retrans;
2637 args->acregmin = data->acregmin;
2638 args->acregmax = data->acregmax;
2639 args->acdirmin = data->acdirmin;
2640 args->acdirmax = data->acdirmax;
2641 args->nfs_server.protocol = data->proto;
259875ef 2642 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2643
2644 break;
7630c852 2645 default:
b72e4f42 2646 return NFS_TEXT_DATA;
f0768ebd
CL		 2647 }
2648
2649 return 0;
2650
2651out_no_data:
2652 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2653 return -EINVAL;
2654
2655out_inval_auth:
2656 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2657 data->auth_flavourlen);
2658 return -EINVAL;
2659
2660out_no_address:
2661 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2662 return -EINVAL;
f0768ebd
CL		 2663}
2664
fac1e8e4
BS		 2665/*
2666 * NFS v4 module parameters need to stay in the
2667 * NFS client for backwards compatibility
2668 */
2669unsigned int nfs_callback_set_tcpport;
2670unsigned short nfs_callback_tcpport;
2671/* Default cache timeout is 10 minutes */
2672unsigned int nfs_idmap_cache_timeout = 600;
2673/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2674bool nfs4_disable_idmapping = true;
2675unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2676unsigned short send_implementation_id = 1;
6f2ea7f2 2677char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
fac1e8e4 2678
89d77c8f
BS		 2679EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2680EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2681EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2682EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2683EXPORT_SYMBOL_GPL(max_session_slots);
2684EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2685EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
89d77c8f 2686
fac1e8e4
BS		 2687#define NFS_CALLBACK_MAXPORTNR (65535U)
2688
2689static int param_set_portnr(const char *val, const struct kernel_param *kp)
2690{
2691 unsigned long num;
2692 int ret;
2693
2694 if (!val)
2695 return -EINVAL;
7297cb68 2696 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2697 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2698 return -EINVAL;
2699 *((unsigned int *)kp->arg) = num;
2700 return 0;
2701}
2702static struct kernel_param_ops param_ops_portnr = {
2703 .set = param_set_portnr,
2704 .get = param_get_uint,
2705};
2706#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2707
2708module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2709module_param(nfs_idmap_cache_timeout, int, 0644);
2710module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2711module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2712 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2713MODULE_PARM_DESC(nfs4_disable_idmapping,
2714 "Turn off NFSv4 idmapping when using 'sec=sys'");
2715module_param(max_session_slots, ushort, 0644);
2716MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2717 "requests the client will negotiate");
2718module_param(send_implementation_id, ushort, 0644);
2719MODULE_PARM_DESC(send_implementation_id,
2720 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2721MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2722
54ceac45 2723#endif /* CONFIG_NFS_V4 */
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