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Merge tag 'for-linus-20130331' of git://git.kernel.dk/linux-block
[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");
fa7614dd 338MODULE_ALIAS("nfs4");
1ae811ee 339EXPORT_SYMBOL_GPL(nfs4_fs_type);
340
341static int __init register_nfs4_fs(void)
342{
343 return register_filesystem(&nfs4_fs_type);
344}
345
346static void unregister_nfs4_fs(void)
347{
348 unregister_filesystem(&nfs4_fs_type);
349}
350#else
351static int __init register_nfs4_fs(void)
352{
353 return 0;
354}
355
356static void unregister_nfs4_fs(void)
357{
358}
f7b422b1
DH		 359#endif
360
8e1f936b
RR		 361static struct shrinker acl_shrinker = {
362 .shrink = nfs_access_cache_shrinker,
363 .seeks = DEFAULT_SEEKS,
364};
979df72e 365
f7b422b1
DH		 366/*
367 * Register the NFS filesystems
368 */
369int __init register_nfs_fs(void)
370{
371 int ret;
372
373 ret = register_filesystem(&nfs_fs_type);
374 if (ret < 0)
375 goto error_0;
376
1ae811ee 377 ret = register_nfs4_fs();
f7b422b1
DH		 378 if (ret < 0)
379 goto error_1;
1ae811ee 380
381 ret = nfs_register_sysctl();
382 if (ret < 0)
383 goto error_2;
8e1f936b 384 register_shrinker(&acl_shrinker);
f7b422b1
DH		 385 return 0;
386
1ae811ee 387error_2:
388 unregister_nfs4_fs();
f7b422b1
DH		 389error_1:
390 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 391error_0:
392 return ret;
393}
394
395/*
396 * Unregister the NFS filesystems
397 */
398void __exit unregister_nfs_fs(void)
399{
8e1f936b 400 unregister_shrinker(&acl_shrinker);
49af7ee1 401 nfs_unregister_sysctl();
1ae811ee 402 unregister_nfs4_fs();
f7b422b1
DH		 403 unregister_filesystem(&nfs_fs_type);
404}
405
1daef0a8 406void nfs_sb_active(struct super_block *sb)
ef818a28 407{
1daef0a8 408 struct nfs_server *server = NFS_SB(sb);
ef818a28 409
1daef0a8
TM		 410 if (atomic_inc_return(&server->active) == 1)
411 atomic_inc(&sb->s_active);
ef818a28 412}
89d77c8f 413EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 414
1daef0a8 415void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 416{
417 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 418
419 if (atomic_dec_and_test(&server->active))
420 deactivate_super(sb);
ef818a28 421}
89d77c8f 422EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 423
f7b422b1
DH		 424/*
425 * Deliver file system statistics to userspace
426 */
fbdefd64 427int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 428{
0c7d90cf 429 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 430 unsigned char blockbits;
431 unsigned long blockres;
0c7d90cf 432 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 433 struct nfs_fsstat res;
434 int error = -ENOMEM;
435
436 res.fattr = nfs_alloc_fattr();
437 if (res.fattr == NULL)
438 goto out_err;
f7b422b1 439
8fa5c000 440 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 441 if (unlikely(error == -ESTALE)) {
442 struct dentry *pd_dentry;
443
444 pd_dentry = dget_parent(dentry);
445 if (pd_dentry != NULL) {
446 nfs_zap_caches(pd_dentry->d_inode);
447 dput(pd_dentry);
448 }
449 }
ca7e9a0d 450 nfs_free_fattr(res.fattr);
f7b422b1
DH		 451 if (error < 0)
452 goto out_err;
ca7e9a0d 453
1a0ba9ae 454 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 455
456 /*
457 * Current versions of glibc do not correctly handle the
458 * case where f_frsize != f_bsize. Eventually we want to
459 * report the value of wtmult in this field.
460 */
0c7d90cf 461 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 462
463 /*
464 * On most *nix systems, f_blocks, f_bfree, and f_bavail
465 * are reported in units of f_frsize. Linux hasn't had
466 * an f_frsize field in its statfs struct until recently,
467 * thus historically Linux's sys_statfs reports these
468 * fields in units of f_bsize.
469 */
0c7d90cf
DH		 470 buf->f_bsize = dentry->d_sb->s_blocksize;
471 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 472 blockres = (1 << blockbits) - 1;
473 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
474 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
475 buf->f_bavail = (res.abytes + blockres) >> blockbits;
476
477 buf->f_files = res.tfiles;
478 buf->f_ffree = res.afiles;
479
480 buf->f_namelen = server->namelen;
1a0ba9ae 481
f7b422b1
DH		 482 return 0;
483
484 out_err:
3110ff80 485 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 486 return error;
f7b422b1 487}
89d77c8f 488EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 489
7d4e2747
DH		 490/*
491 * Map the security flavour number to a name
492 */
81039f1f
TM		 493static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
494{
7d4e2747 495 static const struct {
81039f1f
TM		 496 rpc_authflavor_t flavour;
497 const char *str;
498 } sec_flavours[] = {
499 { RPC_AUTH_NULL, "null" },
500 { RPC_AUTH_UNIX, "sys" },
501 { RPC_AUTH_GSS_KRB5, "krb5" },
502 { RPC_AUTH_GSS_KRB5I, "krb5i" },
503 { RPC_AUTH_GSS_KRB5P, "krb5p" },
504 { RPC_AUTH_GSS_LKEY, "lkey" },
505 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
506 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
507 { RPC_AUTH_GSS_SPKM, "spkm" },
508 { RPC_AUTH_GSS_SPKMI, "spkmi" },
509 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 510 { UINT_MAX, "unknown" }
81039f1f
TM		 511 };
512 int i;
513
4d81cd16 514 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 515 if (sec_flavours[i].flavour == flavour)
516 break;
517 }
518 return sec_flavours[i].str;
519}
520
ee671b01
JL		 521static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
522 int showdefaults)
523{
524 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
525
526 seq_printf(m, ",mountproto=");
527 switch (sap->sa_family) {
528 case AF_INET:
529 switch (nfss->mountd_protocol) {
530 case IPPROTO_UDP:
531 seq_printf(m, RPCBIND_NETID_UDP);
532 break;
533 case IPPROTO_TCP:
534 seq_printf(m, RPCBIND_NETID_TCP);
535 break;
536 default:
537 if (showdefaults)
538 seq_printf(m, "auto");
539 }
540 break;
541 case AF_INET6:
542 switch (nfss->mountd_protocol) {
543 case IPPROTO_UDP:
544 seq_printf(m, RPCBIND_NETID_UDP6);
545 break;
546 case IPPROTO_TCP:
547 seq_printf(m, RPCBIND_NETID_TCP6);
548 break;
549 default:
550 if (showdefaults)
551 seq_printf(m, "auto");
552 }
553 break;
554 default:
555 if (showdefaults)
556 seq_printf(m, "auto");
557 }
558}
559
82d101d5
CL		 560static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
561 int showdefaults)
562{
563 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
564
d5eff1a3
BS		 565 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
566 return;
567
82d101d5
CL		 568 switch (sap->sa_family) {
569 case AF_INET: {
570 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 571 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 572 break;
573 }
574 case AF_INET6: {
575 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 576 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 577 break;
578 }
579 default:
580 if (showdefaults)
581 seq_printf(m, ",mountaddr=unspecified");
582 }
583
584 if (nfss->mountd_version || showdefaults)
585 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 586 if ((nfss->mountd_port &&
587 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
588 showdefaults)
82d101d5
CL		 589 seq_printf(m, ",mountport=%u", nfss->mountd_port);
590
ee671b01 591 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 592}
593
89d77c8f 594#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 595static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
596 int showdefaults)
597{
598 struct nfs_client *clp = nfss->nfs_client;
599
600 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 601}
602#else
603static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605{
606}
607#endif
608
7bbceb6f
TM		 609static void nfs_show_nfs_version(struct seq_file *m,
610 unsigned int version,
611 unsigned int minorversion)
612{
613 seq_printf(m, ",vers=%u", version);
614 if (version == 4)
615 seq_printf(m, ".%u", minorversion);
616}
617
f7b422b1
DH		 618/*
619 * Describe the mount options in force on this server representation
620 */
82d101d5
CL		 621static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
622 int showdefaults)
f7b422b1 623{
509de811 624 static const struct proc_nfs_info {
f7b422b1 625 int flag;
509de811
DH		 626 const char *str;
627 const char *nostr;
f7b422b1
DH		 628 } nfs_info[] = {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 630 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 638 { 0, NULL, NULL }
639 };
509de811 640 const struct proc_nfs_info *nfs_infop;
8fa5c000 641 struct nfs_client *clp = nfss->nfs_client;
82d101d5 642 u32 version = clp->rpc_ops->version;
7c563cc9 643 int local_flock, local_fcntl;
f7b422b1 644
7bbceb6f 645 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
662 else
663 seq_puts(m, nfs_infop->nostr);
664 }
2446ab60 665 rcu_read_lock();
56928edd 666 seq_printf(m, ",proto=%s",
ee671b01 667 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 668 rcu_read_unlock();
82d101d5
CL		 669 if (version == 4) {
670 if (nfss->port != NFS_PORT)
671 seq_printf(m, ",port=%u", nfss->port);
672 } else
673 if (nfss->port)
674 seq_printf(m, ",port=%u", nfss->port);
675
33170233
TM		 676 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
677 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 678 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 679
680 if (version != 4)
681 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 682 else
683 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 684
b797cac7
DH		 685 if (nfss->options & NFS_OPTION_FSCACHE)
686 seq_printf(m, ",fsc");
9b00c643 687
89652617
CL		 688 if (nfss->options & NFS_OPTION_MIGRATION)
689 seq_printf(m, ",migration");
690
9b00c643
PL		 691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
693 seq_printf(m, ",lookupcache=none");
694 else
695 seq_printf(m, ",lookupcache=pos");
696 }
7c563cc9
SJ		 697
698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
700
701 if (!local_flock && !local_fcntl)
702 seq_printf(m, ",local_lock=none");
703 else if (local_flock && local_fcntl)
704 seq_printf(m, ",local_lock=all");
705 else if (local_flock)
706 seq_printf(m, ",local_lock=flock");
707 else
708 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 709}
710
711/*
712 * Describe the mount options on this VFS mountpoint
713 */
fbdefd64 714int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 715{
34c80b1d 716 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 717
718 nfs_show_mount_options(m, nfss, 0);
719
2446ab60 720 rcu_read_lock();
5d8515ca
CL		 721 seq_printf(m, ",addr=%s",
722 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
723 RPC_DISPLAY_ADDR));
2446ab60 724 rcu_read_unlock();
f7b422b1
DH		 725
726 return 0;
727}
89d77c8f 728EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 729
89d77c8f 730#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 731#ifdef CONFIG_NFS_V4_1
45402c38 732static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 733{
734 if (nfs4_has_session(server->nfs_client))
735 seq_printf(m, ",sessions");
736}
737#else
45402c38
HS		 738static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
739#endif
ae50c0b5
BF		 740#endif
741
742#ifdef CONFIG_NFS_V4_1
45402c38 743static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 744{
745 seq_printf(m, ",pnfs=");
746 if (server->pnfs_curr_ld)
747 seq_printf(m, "%s", server->pnfs_curr_ld->name);
748 else
749 seq_printf(m, "not configured");
750}
7e03b7cc
TM		 751
752static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
753{
59155546
CL		 754 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
755 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 756 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
757 "date='%llu,%u'",
758 impl_id->name, impl_id->domain,
759 impl_id->date.seconds, impl_id->date.nseconds);
760 }
761}
45402c38 762#else
89d77c8f 763#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 764static void show_pnfs(struct seq_file *m, struct nfs_server *server)
765{
766}
45402c38 767#endif
7e03b7cc
TM		 768static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
769{
770}
45402c38 771#endif
f7b422b1 772
fbdefd64 773int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 774{
775 char *page = (char *) __get_free_page(GFP_KERNEL);
776 char *devname, *dummy;
777 int err = 0;
778 if (!page)
779 return -ENOMEM;
97a54868 780 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 781 if (IS_ERR(devname))
782 err = PTR_ERR(devname);
783 else
784 seq_escape(m, devname, " \t\n\\");
785 free_page((unsigned long)page);
786 return err;
787}
89d77c8f 788EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 789
fbdefd64 790int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 791{
792 seq_puts(m, "/");
793 return 0;
794}
89d77c8f 795EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 796
f7b422b1
DH		 797/*
798 * Present statistical information for this VFS mountpoint
799 */
fbdefd64 800int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 801{
802 int i, cpu;
64132379 803 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 804 struct rpc_auth *auth = nfss->client->cl_auth;
805 struct nfs_iostats totals = { };
806
807 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
808
809 /*
810 * Display all mount option settings
811 */
812 seq_printf(m, "\n\topts:\t");
64132379
AV		 813 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
814 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
815 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
816 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 817 nfs_show_mount_options(m, nfss, 1);
818
819 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
820
7e03b7cc 821 show_implementation_id(m, nfss);
7d2ed9ac 822
f7b422b1
DH		 823 seq_printf(m, "\n\tcaps:\t");
824 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 825 seq_printf(m, ",wtmult=%u", nfss->wtmult);
826 seq_printf(m, ",dtsize=%u", nfss->dtsize);
827 seq_printf(m, ",bsize=%u", nfss->bsize);
828 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 829
89d77c8f 830#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 831 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 832 seq_printf(m, "\n\tnfsv4:\t");
833 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
834 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
835 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 836 show_sessions(m, nfss);
837 show_pnfs(m, nfss);
f7b422b1
DH		 838 }
839#endif
840
841 /*
842 * Display security flavor in effect for this mount
843 */
2d767432 844 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 845 if (auth->au_flavor)
2d767432 846 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 847
848 /*
849 * Display superblock I/O counters
850 */
851 for_each_possible_cpu(cpu) {
852 struct nfs_iostats *stats;
853
854 preempt_disable();
855 stats = per_cpu_ptr(nfss->io_stats, cpu);
856
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 totals.events[i] += stats->events[i];
859 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
860 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 861#ifdef CONFIG_NFS_FSCACHE
862 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
863 totals.fscache[i] += stats->fscache[i];
864#endif
f7b422b1
DH		 865
866 preempt_enable();
867 }
868
869 seq_printf(m, "\n\tevents:\t");
870 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
871 seq_printf(m, "%lu ", totals.events[i]);
872 seq_printf(m, "\n\tbytes:\t");
873 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
874 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 875#ifdef CONFIG_NFS_FSCACHE
876 if (nfss->options & NFS_OPTION_FSCACHE) {
877 seq_printf(m, "\n\tfsc:\t");
878 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
879 seq_printf(m, "%Lu ", totals.bytes[i]);
880 }
881#endif
f7b422b1
DH		 882 seq_printf(m, "\n");
883
884 rpc_print_iostats(m, nfss->client);
885
886 return 0;
887}
89d77c8f 888EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 889
890/*
891 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 892 * in response to xdev traversals and referrals
f7b422b1 893 */
fbdefd64 894void nfs_umount_begin(struct super_block *sb)
f7b422b1 895{
67e55205 896 struct nfs_server *server;
fc6ae3cf
TM		 897 struct rpc_clnt *rpc;
898
67e55205 899 server = NFS_SB(sb);
fc6ae3cf
TM		 900 /* -EIO all pending I/O */
901 rpc = server->client_acl;
902 if (!IS_ERR(rpc))
903 rpc_killall_tasks(rpc);
904 rpc = server->client;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
f7b422b1 907}
89d77c8f 908EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 909
db833351 910static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 911{
912 struct nfs_parsed_mount_data *data;
913
914 data = kzalloc(sizeof(*data), GFP_KERNEL);
915 if (data) {
9423a08a
CL		 916 data->acregmin = NFS_DEF_ACREGMIN;
917 data->acregmax = NFS_DEF_ACREGMAX;
918 data->acdirmin = NFS_DEF_ACDIRMIN;
919 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 920 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 921 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 922 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 923 data->auth_flavors[0] = RPC_AUTH_UNIX;
924 data->auth_flavor_len = 1;
925 data->minorversion = 0;
b72e4f42 926 data->need_mount = true;
9937347a 927 data->net = current->nsproxy->net_ns;
8a0d551a 928 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 929 }
930 return data;
931}
932
8a0d551a
JL		 933static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
934{
935 if (data) {
936 kfree(data->client_address);
937 kfree(data->mount_server.hostname);
938 kfree(data->nfs_server.export_path);
939 kfree(data->nfs_server.hostname);
940 kfree(data->fscache_uniq);
941 security_free_mnt_opts(&data->lsm_opts);
942 kfree(data);
943 }
944}
945
fc50d58f 946/*
cdcd7f9a
CL		 947 * Sanity-check a server address provided by the mount command.
948 *
949 * Address family must be initialized, and address must not be
950 * the ANY address for that family.
fc50d58f
CL		 951 */
952static int nfs_verify_server_address(struct sockaddr *addr)
953{
954 switch (addr->sa_family) {
955 case AF_INET: {
cdcd7f9a 956 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 957 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 958 }
959 case AF_INET6: {
960 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
961 return !ipv6_addr_any(sa);
fc50d58f
CL		 962 }
963 }
964
53a0b9c4 965 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 966 return 0;
967}
968
4cfd74fc
CL		 969/*
970 * Select between a default port value and a user-specified port value.
971 * If a zero value is set, then autobind will be used.
972 */
f5855fec 973static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 974 const unsigned short default_port)
975{
f5855fec
TM		 976 if (*port == NFS_UNSPEC_PORT)
977 *port = default_port;
4cfd74fc 978
f5855fec 979 rpc_set_port(sap, *port);
4cfd74fc
CL		 980}
981
259875ef
TM		 982/*
983 * Sanity check the NFS transport protocol.
984 *
985 */
986static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
987{
988 switch (mnt->nfs_server.protocol) {
989 case XPRT_TRANSPORT_UDP:
990 case XPRT_TRANSPORT_TCP:
991 case XPRT_TRANSPORT_RDMA:
992 break;
993 default:
994 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
995 }
996}
997
998/*
999 * For text based NFSv2/v3 mounts, the mount protocol transport default
1000 * settings should depend upon the specified NFS transport.
1001 */
1002static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1003{
1004 nfs_validate_transport_protocol(mnt);
1005
1006 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1007 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1008 return;
1009 switch (mnt->nfs_server.protocol) {
1010 case XPRT_TRANSPORT_UDP:
1011 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1012 break;
1013 case XPRT_TRANSPORT_TCP:
1014 case XPRT_TRANSPORT_RDMA:
1015 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1016 }
1017}
1018
01060c89
CL		 1019/*
1020 * Parse the value of the 'sec=' option.
01060c89
CL		 1021 */
1022static int nfs_parse_security_flavors(char *value,
1023 struct nfs_parsed_mount_data *mnt)
1024{
1025 substring_t args[MAX_OPT_ARGS];
1026
1027 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1028
1029 switch (match_token(value, nfs_secflavor_tokens, args)) {
1030 case Opt_sec_none:
01060c89
CL		 1031 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1032 break;
1033 case Opt_sec_sys:
01060c89
CL		 1034 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1035 break;
1036 case Opt_sec_krb5:
01060c89
CL		 1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1038 break;
1039 case Opt_sec_krb5i:
01060c89
CL		 1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1041 break;
1042 case Opt_sec_krb5p:
01060c89
CL		 1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1044 break;
1045 case Opt_sec_lkey:
01060c89
CL		 1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1047 break;
1048 case Opt_sec_lkeyi:
01060c89
CL		 1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1050 break;
1051 case Opt_sec_lkeyp:
01060c89
CL		 1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1053 break;
1054 case Opt_sec_spkm:
01060c89
CL		 1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1056 break;
1057 case Opt_sec_spkmi:
01060c89
CL		 1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1059 break;
1060 case Opt_sec_spkmp:
01060c89
CL		 1061 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1062 break;
1063 default:
1064 return 0;
1065 }
1066
9b7160c5 1067 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1068 mnt->auth_flavor_len = 1;
01060c89
CL		 1069 return 1;
1070}
1071
0d71b058
TM		 1072static int nfs_parse_version_string(char *string,
1073 struct nfs_parsed_mount_data *mnt,
1074 substring_t *args)
1075{
1076 mnt->flags &= ~NFS_MOUNT_VER3;
1077 switch (match_token(string, nfs_vers_tokens, args)) {
1078 case Opt_vers_2:
1079 mnt->version = 2;
1080 break;
1081 case Opt_vers_3:
1082 mnt->flags |= NFS_MOUNT_VER3;
1083 mnt->version = 3;
1084 break;
1085 case Opt_vers_4:
1086 /* Backward compatibility option. In future,
1087 * the mount program should always supply
1088 * a NFSv4 minor version number.
1089 */
1090 mnt->version = 4;
1091 break;
1092 case Opt_vers_4_0:
1093 mnt->version = 4;
1094 mnt->minorversion = 0;
1095 break;
1096 case Opt_vers_4_1:
1097 mnt->version = 4;
1098 mnt->minorversion = 1;
1099 break;
1100 default:
1101 return 0;
1102 }
1103 return 1;
1104}
1105
c5cb09b6
RL		 1106static int nfs_get_option_str(substring_t args[], char **option)
1107{
1108 kfree(*option);
1109 *option = match_strdup(args);
e25fbe38 1110 return !*option;
c5cb09b6
RL		 1111}
1112
1113static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1114{
1115 int rc;
1116 char *string;
1117
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 return -ENOMEM;
7297cb68 1121 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1122 kfree(string);
1123
1124 return rc;
1125}
1126
bf0fd768
CL		 1127/*
1128 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1129 * a data structure. The whole mount string is processed; bad options are
1130 * skipped as they are encountered. If there were no errors, return 1;
1131 * otherwise return 0 (zero).
bf0fd768
CL		 1132 */
1133static int nfs_parse_mount_options(char *raw,
1134 struct nfs_parsed_mount_data *mnt)
1135{
f9c3a380 1136 char *p, *string, *secdata;
d23c45fd 1137 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1138 unsigned short protofamily = AF_UNSPEC;
1139 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1140
1141 if (!raw) {
1142 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1143 return 1;
1144 }
1145 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1146
f9c3a380
EP		 1147 secdata = alloc_secdata();
1148 if (!secdata)
1149 goto out_nomem;
1150
1151 rc = security_sb_copy_data(raw, secdata);
1152 if (rc)
1153 goto out_security_failure;
1154
1155 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1156 if (rc)
1157 goto out_security_failure;
1158
1159 free_secdata(secdata);
1160
bf0fd768
CL		 1161 while ((p = strsep(&raw, ",")) != NULL) {
1162 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1163 unsigned long option;
1164 int token;
bf0fd768
CL		 1165
1166 if (!*p)
1167 continue;
1168
1169 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1170
1171 token = match_token(p, nfs_mount_option_tokens, args);
1172 switch (token) {
f45663ce
CL		 1173
1174 /*
1175 * boolean options: foo/nofoo
1176 */
bf0fd768
CL		 1177 case Opt_soft:
1178 mnt->flags |= NFS_MOUNT_SOFT;
1179 break;
1180 case Opt_hard:
1181 mnt->flags &= ~NFS_MOUNT_SOFT;
1182 break;
bf0fd768
CL		 1183 case Opt_posix:
1184 mnt->flags |= NFS_MOUNT_POSIX;
1185 break;
1186 case Opt_noposix:
1187 mnt->flags &= ~NFS_MOUNT_POSIX;
1188 break;
1189 case Opt_cto:
1190 mnt->flags &= ~NFS_MOUNT_NOCTO;
1191 break;
1192 case Opt_nocto:
1193 mnt->flags |= NFS_MOUNT_NOCTO;
1194 break;
1195 case Opt_ac:
1196 mnt->flags &= ~NFS_MOUNT_NOAC;
1197 break;
1198 case Opt_noac:
1199 mnt->flags |= NFS_MOUNT_NOAC;
1200 break;
1201 case Opt_lock:
1202 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1203 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1204 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1205 break;
1206 case Opt_nolock:
1207 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1208 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1209 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1210 break;
bf0fd768
CL		 1211 case Opt_udp:
1212 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1213 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1214 break;
1215 case Opt_tcp:
1216 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1218 break;
2cf7ff7a
TT		 1219 case Opt_rdma:
1220 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1221 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1222 xprt_load_transport(p);
2cf7ff7a 1223 break;
bf0fd768
CL		 1224 case Opt_acl:
1225 mnt->flags &= ~NFS_MOUNT_NOACL;
1226 break;
1227 case Opt_noacl:
1228 mnt->flags |= NFS_MOUNT_NOACL;
1229 break;
1230 case Opt_rdirplus:
1231 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1232 break;
1233 case Opt_nordirplus:
1234 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1235 break;
75180df2
TM		 1236 case Opt_sharecache:
1237 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1238 break;
1239 case Opt_nosharecache:
1240 mnt->flags |= NFS_MOUNT_UNSHARED;
1241 break;
d740351b
CL		 1242 case Opt_resvport:
1243 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1244 break;
1245 case Opt_noresvport:
1246 mnt->flags |= NFS_MOUNT_NORESVPORT;
1247 break;
b797cac7
DH		 1248 case Opt_fscache:
1249 mnt->options |= NFS_OPTION_FSCACHE;
1250 kfree(mnt->fscache_uniq);
1251 mnt->fscache_uniq = NULL;
1252 break;
1253 case Opt_nofscache:
1254 mnt->options &= ~NFS_OPTION_FSCACHE;
1255 kfree(mnt->fscache_uniq);
1256 mnt->fscache_uniq = NULL;
1257 break;
89652617
CL		 1258 case Opt_migration:
1259 mnt->options |= NFS_OPTION_MIGRATION;
1260 break;
1261 case Opt_nomigration:
1262 mnt->options &= NFS_OPTION_MIGRATION;
1263 break;
bf0fd768 1264
f45663ce
CL		 1265 /*
1266 * options that take numeric values
1267 */
bf0fd768 1268 case Opt_port:
c5cb09b6
RL		 1269 if (nfs_get_option_ul(args, &option) ||
1270 option > USHRT_MAX)
d23c45fd
CL		 1271 goto out_invalid_value;
1272 mnt->nfs_server.port = option;
bf0fd768
CL		 1273 break;
1274 case Opt_rsize:
c5cb09b6 1275 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1276 goto out_invalid_value;
1277 mnt->rsize = option;
bf0fd768
CL		 1278 break;
1279 case Opt_wsize:
c5cb09b6 1280 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1281 goto out_invalid_value;
1282 mnt->wsize = option;
bf0fd768
CL		 1283 break;
1284 case Opt_bsize:
c5cb09b6 1285 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1286 goto out_invalid_value;
1287 mnt->bsize = option;
bf0fd768
CL		 1288 break;
1289 case Opt_timeo:
c5cb09b6 1290 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1291 goto out_invalid_value;
1292 mnt->timeo = option;
bf0fd768
CL		 1293 break;
1294 case Opt_retrans:
c5cb09b6 1295 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1296 goto out_invalid_value;
1297 mnt->retrans = option;
bf0fd768
CL		 1298 break;
1299 case Opt_acregmin:
c5cb09b6 1300 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1301 goto out_invalid_value;
1302 mnt->acregmin = option;
bf0fd768
CL		 1303 break;
1304 case Opt_acregmax:
c5cb09b6 1305 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1306 goto out_invalid_value;
1307 mnt->acregmax = option;
bf0fd768
CL		 1308 break;
1309 case Opt_acdirmin:
c5cb09b6 1310 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1311 goto out_invalid_value;
1312 mnt->acdirmin = option;
bf0fd768
CL		 1313 break;
1314 case Opt_acdirmax:
c5cb09b6 1315 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1316 goto out_invalid_value;
1317 mnt->acdirmax = option;
bf0fd768
CL		 1318 break;
1319 case Opt_actimeo:
c5cb09b6 1320 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1321 goto out_invalid_value;
1322 mnt->acregmin = mnt->acregmax =
1323 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1324 break;
1325 case Opt_namelen:
c5cb09b6 1326 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1327 goto out_invalid_value;
1328 mnt->namlen = option;
bf0fd768
CL		 1329 break;
1330 case Opt_mountport:
c5cb09b6
RL		 1331 if (nfs_get_option_ul(args, &option) ||
1332 option > USHRT_MAX)
d23c45fd
CL		 1333 goto out_invalid_value;
1334 mnt->mount_server.port = option;
bf0fd768 1335 break;
bf0fd768 1336 case Opt_mountvers:
c5cb09b6 1337 if (nfs_get_option_ul(args, &option) ||
f45663ce 1338 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1339 option > NFS_MNT3_VERSION)
1340 goto out_invalid_value;
1341 mnt->mount_server.version = option;
bf0fd768 1342 break;
3fd5be9e 1343 case Opt_minorversion:
c5cb09b6 1344 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1345 goto out_invalid_value;
1346 if (option > NFS4_MAX_MINOR_VERSION)
1347 goto out_invalid_value;
1348 mnt->minorversion = option;
3fd5be9e 1349 break;
bf0fd768 1350
f45663ce
CL		 1351 /*
1352 * options that take text values
1353 */
0d71b058
TM		 1354 case Opt_nfsvers:
1355 string = match_strdup(args);
1356 if (string == NULL)
1357 goto out_nomem;
1358 rc = nfs_parse_version_string(string, mnt, args);
1359 kfree(string);
1360 if (!rc)
1361 goto out_invalid_value;
1362 break;
bf0fd768
CL		 1363 case Opt_sec:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
01060c89 1367 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1368 kfree(string);
f45663ce 1369 if (!rc) {
f45663ce
CL		 1370 dfprintk(MOUNT, "NFS: unrecognized "
1371 "security flavor\n");
d23c45fd 1372 return 0;
f45663ce 1373 }
bf0fd768
CL		 1374 break;
1375 case Opt_proto:
1376 string = match_strdup(args);
1377 if (string == NULL)
1378 goto out_nomem;
1379 token = match_token(string,
1380 nfs_xprt_protocol_tokens, args);
bf0fd768 1381
ee671b01 1382 protofamily = AF_INET;
bf0fd768 1383 switch (token) {
ee671b01
JL		 1384 case Opt_xprt_udp6:
1385 protofamily = AF_INET6;
fdb66ff4 1386 case Opt_xprt_udp:
bf0fd768 1387 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1388 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1389 break;
ee671b01
JL		 1390 case Opt_xprt_tcp6:
1391 protofamily = AF_INET6;
fdb66ff4 1392 case Opt_xprt_tcp:
bf0fd768 1393 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1395 break;
2cf7ff7a
TT		 1396 case Opt_xprt_rdma:
1397 /* vector side protocols to TCP */
1398 mnt->flags |= NFS_MOUNT_TCP;
1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1400 xprt_load_transport(string);
2cf7ff7a 1401 break;
bf0fd768 1402 default:
f45663ce
CL		 1403 dfprintk(MOUNT, "NFS: unrecognized "
1404 "transport protocol\n");
4223a4a1 1405 kfree(string);
d23c45fd 1406 return 0;
bf0fd768 1407 }
c5cb09b6 1408 kfree(string);
bf0fd768
CL		 1409 break;
1410 case Opt_mountproto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
d508afb4 1416 kfree(string);
bf0fd768 1417
ee671b01 1418 mountfamily = AF_INET;
bf0fd768 1419 switch (token) {
ee671b01
JL		 1420 case Opt_xprt_udp6:
1421 mountfamily = AF_INET6;
fdb66ff4 1422 case Opt_xprt_udp:
0896a725 1423 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1424 break;
ee671b01
JL		 1425 case Opt_xprt_tcp6:
1426 mountfamily = AF_INET6;
fdb66ff4 1427 case Opt_xprt_tcp:
0896a725 1428 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1429 break;
2cf7ff7a 1430 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1431 default:
f45663ce
CL		 1432 dfprintk(MOUNT, "NFS: unrecognized "
1433 "transport protocol\n");
d23c45fd 1434 return 0;
bf0fd768
CL		 1435 }
1436 break;
1437 case Opt_addr:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
53a0b9c4 1441 mnt->nfs_server.addrlen =
b48e1278 1442 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1443 (struct sockaddr *)
1444 &mnt->nfs_server.address,
1445 sizeof(mnt->nfs_server.address));
bf0fd768 1446 kfree(string);
53a0b9c4
CL		 1447 if (mnt->nfs_server.addrlen == 0)
1448 goto out_invalid_address;
bf0fd768
CL		 1449 break;
1450 case Opt_clientaddr:
c5cb09b6 1451 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1452 goto out_nomem;
bf0fd768 1453 break;
33832034 1454 case Opt_mounthost:
c5cb09b6
RL		 1455 if (nfs_get_option_str(args,
1456 &mnt->mount_server.hostname))
33832034 1457 goto out_nomem;
33832034 1458 break;
0ac83779 1459 case Opt_mountaddr:
bf0fd768
CL		 1460 string = match_strdup(args);
1461 if (string == NULL)
1462 goto out_nomem;
53a0b9c4 1463 mnt->mount_server.addrlen =
b48e1278 1464 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1465 (struct sockaddr *)
1466 &mnt->mount_server.address,
1467 sizeof(mnt->mount_server.address));
bf0fd768 1468 kfree(string);
53a0b9c4
CL		 1469 if (mnt->mount_server.addrlen == 0)
1470 goto out_invalid_address;
bf0fd768 1471 break;
7973c1f1
TM		 1472 case Opt_lookupcache:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 token = match_token(string,
1477 nfs_lookupcache_tokens, args);
1478 kfree(string);
1479 switch (token) {
1480 case Opt_lookupcache_all:
1481 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1482 break;
1483 case Opt_lookupcache_positive:
1484 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1485 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1486 break;
1487 case Opt_lookupcache_none:
1488 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1489 break;
1490 default:
7973c1f1
TM		 1491 dfprintk(MOUNT, "NFS: invalid "
1492 "lookupcache argument\n");
d23c45fd 1493 return 0;
7973c1f1
TM		 1494 };
1495 break;
a6d5ff64 1496 case Opt_fscache_uniq:
c5cb09b6 1497 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1498 goto out_nomem;
a6d5ff64
CL		 1499 mnt->options |= NFS_OPTION_FSCACHE;
1500 break;
5eebde23
SJ		 1501 case Opt_local_lock:
1502 string = match_strdup(args);
1503 if (string == NULL)
1504 goto out_nomem;
1505 token = match_token(string, nfs_local_lock_tokens,
1506 args);
1507 kfree(string);
1508 switch (token) {
1509 case Opt_local_lock_all:
1510 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1511 NFS_MOUNT_LOCAL_FCNTL);
1512 break;
1513 case Opt_local_lock_flock:
1514 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1515 break;
1516 case Opt_local_lock_posix:
1517 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1518 break;
1519 case Opt_local_lock_none:
1520 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1521 NFS_MOUNT_LOCAL_FCNTL);
1522 break;
1523 default:
1524 dfprintk(MOUNT, "NFS: invalid "
1525 "local_lock argument\n");
1526 return 0;
1527 };
1528 break;
bf0fd768 1529
f45663ce
CL		 1530 /*
1531 * Special options
1532 */
1533 case Opt_sloppy:
1534 sloppy = 1;
1535 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1536 break;
bf0fd768
CL		 1537 case Opt_userspace:
1538 case Opt_deprecated:
d33e4dfe
CL		 1539 dfprintk(MOUNT, "NFS: ignoring mount option "
1540 "'%s'\n", p);
bf0fd768
CL		 1541 break;
1542
1543 default:
d23c45fd 1544 invalid_option = 1;
f45663ce
CL		 1545 dfprintk(MOUNT, "NFS: unrecognized mount option "
1546 "'%s'\n", p);
bf0fd768
CL		 1547 }
1548 }
1549
d23c45fd
CL		 1550 if (!sloppy && invalid_option)
1551 return 0;
1552
571b7554
WAA		 1553 if (mnt->minorversion && mnt->version != 4)
1554 goto out_minorversion_mismatch;
1555
89652617
CL		 1556 if (mnt->options & NFS_OPTION_MIGRATION &&
1557 mnt->version != 4 && mnt->minorversion != 0)
1558 goto out_migration_misuse;
1559
ee671b01
JL		 1560 /*
1561 * verify that any proto=/mountproto= options match the address
1856b225 1562 * families in the addr=/mountaddr= options.
ee671b01
JL		 1563 */
1564 if (protofamily != AF_UNSPEC &&
1565 protofamily != mnt->nfs_server.address.ss_family)
1566 goto out_proto_mismatch;
1567
1568 if (mountfamily != AF_UNSPEC) {
1569 if (mnt->mount_server.addrlen) {
1570 if (mountfamily != mnt->mount_server.address.ss_family)
1571 goto out_mountproto_mismatch;
1572 } else {
1573 if (mountfamily != mnt->nfs_server.address.ss_family)
1574 goto out_mountproto_mismatch;
1575 }
1576 }
1577
bf0fd768
CL		 1578 return 1;
1579
ee671b01
JL		 1580out_mountproto_mismatch:
1581 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1582 "option\n");
1583 return 0;
1584out_proto_mismatch:
1585 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1586 return 0;
53a0b9c4
CL		 1587out_invalid_address:
1588 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1589 return 0;
d23c45fd 1590out_invalid_value:
53a0b9c4 1591 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1592 return 0;
571b7554
WAA		 1593out_minorversion_mismatch:
1594 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1595 "minorversion=%u\n", mnt->version, mnt->minorversion);
1596 return 0;
89652617
CL		 1597out_migration_misuse:
1598 printk(KERN_INFO
1599 "NFS: 'migration' not supported for this NFS version\n");
1600 return 0;
bf0fd768
CL		 1601out_nomem:
1602 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1603 return 0;
f9c3a380
EP		 1604out_security_failure:
1605 free_secdata(secdata);
1606 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1607 return 0;
bf0fd768
CL		 1608}
1609
ec88f28d
CL		 1610/*
1611 * Match the requested auth flavors with the list returned by
1612 * the server. Returns zero and sets the mount's authentication
1613 * flavor on success; returns -EACCES if server does not support
1614 * the requested flavor.
1615 */
1616static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1617 struct nfs_mount_request *request)
1618{
1619 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1620
5eecfde6
CL		 1621 /*
1622 * Certain releases of Linux's mountd return an empty
1623 * flavor list. To prevent behavioral regression with
1624 * these servers (ie. rejecting mounts that used to
1625 * succeed), revert to pre-2.6.32 behavior (no checking)
1626 * if the returned flavor list is empty.
1627 */
1628 if (server_authlist_len == 0)
1629 return 0;
1630
ec88f28d
CL		 1631 /*
1632 * We avoid sophisticated negotiating here, as there are
1633 * plenty of cases where we can get it wrong, providing
1634 * either too little or too much security.
1635 *
1636 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1637 * flavor listed first. However, some servers list
1638 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1639 * preferred default, in args->auth_flavors[0] if user
1640 * didn't specify sec= mount option.
1641 */
1642 for (i = 0; i < args->auth_flavor_len; i++)
1643 for (j = 0; j < server_authlist_len; j++)
1644 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1645 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1646 request->auth_flavs[j]);
1647 args->auth_flavors[0] = request->auth_flavs[j];
1648 return 0;
1649 }
1650
1651 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1652 nfs_umount(request);
1653 return -EACCES;
1654}
1655
0076d7b7
CL		 1656/*
1657 * Use the remote server's MOUNT service to request the NFS file handle
1658 * corresponding to the provided path.
1659 */
486aa699
BS		 1660static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1661 struct nfs_fh *root_fh)
0076d7b7 1662{
ec88f28d
CL		 1663 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1664 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1665 struct nfs_mount_request request = {
1666 .sap = (struct sockaddr *)
1667 &args->mount_server.address,
1668 .dirpath = args->nfs_server.export_path,
1669 .protocol = args->mount_server.protocol,
1670 .fh = root_fh,
50a737f8 1671 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1672 .auth_flav_len = &server_authlist_len,
1673 .auth_flavs = server_authlist,
6d59b8d5 1674 .net = args->net,
c5d120f8 1675 };
4c568017 1676 int status;
0076d7b7
CL		 1677
1678 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1679 switch (args->version) {
1680 default:
1681 args->mount_server.version = NFS_MNT3_VERSION;
1682 break;
1683 case 2:
1684 args->mount_server.version = NFS_MNT_VERSION;
1685 }
0076d7b7 1686 }
c5d120f8 1687 request.version = args->mount_server.version;
0076d7b7 1688
33832034 1689 if (args->mount_server.hostname)
c5d120f8 1690 request.hostname = args->mount_server.hostname;
33832034 1691 else
c5d120f8 1692 request.hostname = args->nfs_server.hostname;
33832034 1693
0076d7b7
CL		 1694 /*
1695 * Construct the mount server's address.
1696 */
4c568017 1697 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1698 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1699 args->nfs_server.addrlen);
1700 args->mount_server.addrlen = args->nfs_server.addrlen;
1701 }
c5d120f8 1702 request.salen = args->mount_server.addrlen;
f5855fec 1703 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1704
1705 /*
1706 * Now ask the mount server to map our export path
1707 * to a file handle.
1708 */
c5d120f8 1709 status = nfs_mount(&request);
ec88f28d
CL		 1710 if (status != 0) {
1711 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1712 request.hostname, status);
1713 return status;
1714 }
0076d7b7 1715
ec88f28d
CL		 1716 /*
1717 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1718 */
1719 if (args->mount_server.version != NFS_MNT3_VERSION)
1720 return 0;
1721 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1722}
1723
ff9099f2
BS		 1724struct dentry *nfs_try_mount(int flags, const char *dev_name,
1725 struct nfs_mount_info *mount_info,
1726 struct nfs_subversion *nfs_mod)
486aa699
BS		 1727{
1728 int status;
1729 struct nfs_server *server;
1730
b72e4f42 1731 if (mount_info->parsed->need_mount) {
87c7083d 1732 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1733 if (status)
1734 return ERR_PTR(status);
1735 }
486aa699
BS		 1736
1737 /* Get a volume representation */
1179acc6 1738 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699
BS		 1739 if (IS_ERR(server))
1740 return ERR_CAST(server);
1741
ab7017a3 1742 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1743}
ddda8e0a 1744EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1745
c12bacec
RL		 1746/*
1747 * Split "dev_name" into "hostname:export_path".
1748 *
1749 * The leftmost colon demarks the split between the server's hostname
1750 * and the export path. If the hostname starts with a left square
1751 * bracket, then it may contain colons.
1752 *
1753 * Note: caller frees hostname and export path, even on error.
1754 */
1755static int nfs_parse_devname(const char *dev_name,
1756 char **hostname, size_t maxnamlen,
1757 char **export_path, size_t maxpathlen)
dc045898
CL		 1758{
1759 size_t len;
c12bacec 1760 char *end;
dc045898 1761
c12bacec
RL		 1762 /* Is the host name protected with square brakcets? */
1763 if (*dev_name == '[') {
1764 end = strchr(++dev_name, ']');
1765 if (end == NULL || end[1] != ':')
dc045898 1766 goto out_bad_devname;
dc045898 1767
c12bacec
RL		 1768 len = end - dev_name;
1769 end++;
1770 } else {
1771 char *comma;
dc045898 1772
c12bacec
RL		 1773 end = strchr(dev_name, ':');
1774 if (end == NULL)
1775 goto out_bad_devname;
1776 len = end - dev_name;
d1aa0825 1777
c12bacec
RL		 1778 /* kill possible hostname list: not supported */
1779 comma = strchr(dev_name, ',');
1780 if (comma != NULL && comma < end)
1781 *comma = 0;
1782 }
d1aa0825 1783
d1aa0825
CL		 1784 if (len > maxnamlen)
1785 goto out_hostname;
1786
1787 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1788 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1789 if (*hostname == NULL)
1790 goto out_nomem;
c12bacec 1791 len = strlen(++end);
d1aa0825
CL		 1792 if (len > maxpathlen)
1793 goto out_path;
1794 *export_path = kstrndup(end, len, GFP_KERNEL);
1795 if (!*export_path)
1796 goto out_nomem;
1797
c12bacec 1798 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1799 return 0;
1800
1801out_bad_devname:
1802 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1803 return -EINVAL;
1804
1805out_nomem:
1806 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1807 return -ENOMEM;
1808
1809out_hostname:
1810 dfprintk(MOUNT, "NFS: server hostname too long\n");
1811 return -ENAMETOOLONG;
1812
1813out_path:
1814 dfprintk(MOUNT, "NFS: export pathname too long\n");
1815 return -ENAMETOOLONG;
1816}
1817
f7b422b1 1818/*
54ceac45
DH		 1819 * Validate the NFS2/NFS3 mount data
1820 * - fills in the mount root filehandle
136d558c
CL		 1821 *
1822 * For option strings, user space handles the following behaviors:
1823 *
1824 * + DNS: mapping server host name to IP address ("addr=" option)
1825 *
1826 * + failure mode: how to behave if a mount request can't be handled
1827 * immediately ("fg/bg" option)
1828 *
1829 * + retry: how often to retry a mount request ("retry=" option)
1830 *
1831 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1832 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1833 */
d72c727c
BS		 1834static int nfs23_validate_mount_data(void *options,
1835 struct nfs_parsed_mount_data *args,
1836 struct nfs_fh *mntfh,
1837 const char *dev_name)
f7b422b1 1838{
2283f8d6 1839 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1840 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1841
5df36e78
CL		 1842 if (data == NULL)
1843 goto out_no_data;
f7b422b1 1844
c5afc8da 1845 args->version = NFS_DEFAULT_VERSION;
54ceac45 1846 switch (data->version) {
5df36e78
CL		 1847 case 1:
1848 data->namlen = 0;
1849 case 2:
1850 data->bsize = 0;
1851 case 3:
1852 if (data->flags & NFS_MOUNT_VER3)
1853 goto out_no_v3;
1854 data->root.size = NFS2_FHSIZE;
1855 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1856 case 4:
1857 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1858 goto out_no_sec;
1859 case 5:
1860 memset(data->context, 0, sizeof(data->context));
1861 case 6:
b7e24457
TM		 1862 if (data->flags & NFS_MOUNT_VER3) {
1863 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1864 goto out_invalid_fh;
5df36e78 1865 mntfh->size = data->root.size;
764302cc
CL		 1866 args->version = 3;
1867 } else {
5df36e78 1868 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1869 args->version = 2;
1870 }
5df36e78 1871
5df36e78
CL		 1872
1873 memcpy(mntfh->data, data->root.data, mntfh->size);
1874 if (mntfh->size < sizeof(mntfh->data))
1875 memset(mntfh->data + mntfh->size, 0,
1876 sizeof(mntfh->data) - mntfh->size);
6e88e061 1877
2283f8d6
TT		 1878 /*
1879 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1880 * can deal with.
1881 */
ff3525a5 1882 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1883 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1884 args->rsize = data->rsize;
1885 args->wsize = data->wsize;
2283f8d6
TT		 1886 args->timeo = data->timeo;
1887 args->retrans = data->retrans;
1888 args->acregmin = data->acregmin;
1889 args->acregmax = data->acregmax;
1890 args->acdirmin = data->acdirmin;
1891 args->acdirmax = data->acdirmax;
b72e4f42 1892 args->need_mount = false;
4c568017 1893
4cfd74fc 1894 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1895 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 1896 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 1897 if (!nfs_verify_server_address(sap))
4c568017
CL		 1898 goto out_no_address;
1899
2283f8d6 1900 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1901 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1902 /* N.B. caller will free nfs_server.hostname in all cases */
1903 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1904 args->namlen = data->namlen;
1905 args->bsize = data->bsize;
dd07c947
CL		 1906
1907 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1908 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1909 if (!args->nfs_server.hostname)
1910 goto out_nomem;
f9c3a380 1911
5eebde23
SJ		 1912 if (!(data->flags & NFS_MOUNT_NONLM))
1913 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1914 NFS_MOUNT_LOCAL_FCNTL);
1915 else
1916 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1917 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1918 /*
1919 * The legacy version 6 binary mount data from userspace has a
1920 * field used only to transport selinux information into the
1921 * the kernel. To continue to support that functionality we
1922 * have a touch of selinux knowledge here in the NFS code. The
1923 * userspace code converted context=blah to just blah so we are
1924 * converting back to the full string selinux understands.
1925 */
1926 if (data->context[0]){
1927#ifdef CONFIG_SECURITY_SELINUX
1928 int rc;
1929 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1930 if (!opts_str)
1931 return -ENOMEM;
1932 strcpy(opts_str, "context=");
1933 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1934 strcat(opts_str, &data->context[0]);
1935 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1936 kfree(opts_str);
1937 if (rc)
1938 return rc;
1939#else
1940 return -EINVAL;
1941#endif
1942 }
1943
5df36e78 1944 break;
b72e4f42
BS		 1945 default:
1946 return NFS_TEXT_DATA;
f7b422b1 1947 }
54ceac45 1948
1c606fb7 1949#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 1950 if (args->version == 3)
5df36e78
CL		 1951 goto out_v3_not_compiled;
1952#endif /* !CONFIG_NFS_V3 */
f7b422b1 1953
5df36e78 1954 return 0;
f7b422b1 1955
5df36e78
CL		 1956out_no_data:
1957 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1958 return -EINVAL;
54ceac45 1959
5df36e78
CL		 1960out_no_v3:
1961 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1962 data->version);
1963 return -EINVAL;
f7b422b1 1964
5df36e78
CL		 1965out_no_sec:
1966 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1967 return -EINVAL;
1968
1c606fb7 1969#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 1970out_v3_not_compiled:
1971 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1972 return -EPROTONOSUPPORT;
1973#endif /* !CONFIG_NFS_V3 */
1974
63649bd7
CG		 1975out_nomem:
1976 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1977 return -ENOMEM;
1978
5df36e78
CL		 1979out_no_address:
1980 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1981 return -EINVAL;
1982
1983out_invalid_fh:
1984 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1985 return -EINVAL;
f7b422b1
DH		 1986}
1987
89d77c8f 1988#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 1989static int nfs_validate_mount_data(struct file_system_type *fs_type,
1990 void *options,
1991 struct nfs_parsed_mount_data *args,
1992 struct nfs_fh *mntfh,
1993 const char *dev_name)
1994{
1995 if (fs_type == &nfs_fs_type)
1996 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1997 return nfs4_validate_mount_data(options, args, dev_name);
1998}
1999#else
2000static int nfs_validate_mount_data(struct file_system_type *fs_type,
2001 void *options,
2002 struct nfs_parsed_mount_data *args,
2003 struct nfs_fh *mntfh,
2004 const char *dev_name)
2005{
2006 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2007}
2008#endif
2009
b72e4f42
BS		 2010static int nfs_validate_text_mount_data(void *options,
2011 struct nfs_parsed_mount_data *args,
2012 const char *dev_name)
2013{
2014 int port = 0;
2015 int max_namelen = PAGE_SIZE;
2016 int max_pathlen = NFS_MAXPATHLEN;
2017 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2018
2019 if (nfs_parse_mount_options((char *)options, args) == 0)
2020 return -EINVAL;
2021
2022 if (!nfs_verify_server_address(sap))
2023 goto out_no_address;
2024
2025 if (args->version == 4) {
89d77c8f 2026#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2027 port = NFS_PORT;
2028 max_namelen = NFS4_MAXNAMLEN;
2029 max_pathlen = NFS4_MAXPATHLEN;
2030 nfs_validate_transport_protocol(args);
2031 nfs4_validate_mount_flags(args);
2032#else
2033 goto out_v4_not_compiled;
2034#endif /* CONFIG_NFS_V4 */
2035 } else
2036 nfs_set_mount_transport_protocol(args);
2037
2038 nfs_set_port(sap, &args->nfs_server.port, port);
2039
2040 if (args->auth_flavor_len > 1)
2041 goto out_bad_auth;
2042
2043 return nfs_parse_devname(dev_name,
2044 &args->nfs_server.hostname,
2045 max_namelen,
2046 &args->nfs_server.export_path,
2047 max_pathlen);
2048
89d77c8f 2049#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2050out_v4_not_compiled:
2051 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2052 return -EPROTONOSUPPORT;
2053#endif /* !CONFIG_NFS_V4 */
2054
2055out_no_address:
2056 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2057 return -EINVAL;
2058
2059out_bad_auth:
2060 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2061 return -EINVAL;
2062}
2063
48b605f8
JL		 2064static int
2065nfs_compare_remount_data(struct nfs_server *nfss,
2066 struct nfs_parsed_mount_data *data)
2067{
2068 if (data->flags != nfss->flags ||
2069 data->rsize != nfss->rsize ||
2070 data->wsize != nfss->wsize ||
2071 data->retrans != nfss->client->cl_timeout->to_retries ||
2072 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2073 data->acregmin != nfss->acregmin / HZ ||
2074 data->acregmax != nfss->acregmax / HZ ||
2075 data->acdirmin != nfss->acdirmin / HZ ||
2076 data->acdirmax != nfss->acdirmax / HZ ||
2077 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2078 data->nfs_server.port != nfss->port ||
48b605f8 2079 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2080 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2081 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2082 return -EINVAL;
2083
2084 return 0;
2085}
2086
fbdefd64 2087int
48b605f8
JL		 2088nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2089{
2090 int error;
2091 struct nfs_server *nfss = sb->s_fs_info;
2092 struct nfs_parsed_mount_data *data;
2093 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2094 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2095 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2096
2097 /*
2098 * Userspace mount programs that send binary options generally send
2099 * them populated with default values. We have no way to know which
2100 * ones were explicitly specified. Fall back to legacy behavior and
2101 * just return success.
2102 */
31c94469
MZ		 2103 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2104 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2105 options->version <= 6))))
48b605f8
JL		 2106 return 0;
2107
2108 data = kzalloc(sizeof(*data), GFP_KERNEL);
2109 if (data == NULL)
2110 return -ENOMEM;
2111
2112 /* fill out struct with values from existing mount */
2113 data->flags = nfss->flags;
2114 data->rsize = nfss->rsize;
2115 data->wsize = nfss->wsize;
2116 data->retrans = nfss->client->cl_timeout->to_retries;
2117 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2118 data->acregmin = nfss->acregmin / HZ;
2119 data->acregmax = nfss->acregmax / HZ;
2120 data->acdirmin = nfss->acdirmin / HZ;
2121 data->acdirmax = nfss->acdirmax / HZ;
2122 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2123 data->nfs_server.port = nfss->port;
48b605f8
JL		 2124 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2125 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2126 data->nfs_server.addrlen);
2127
2128 /* overwrite those values with any that were specified */
2129 error = nfs_parse_mount_options((char *)options, data);
2130 if (error < 0)
2131 goto out;
2132
26c4c170
JL		 2133 /*
2134 * noac is a special case. It implies -o sync, but that's not
2135 * necessarily reflected in the mtab options. do_remount_sb
2136 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2137 * remount options, so we have to explicitly reset it.
2138 */
2139 if (data->flags & NFS_MOUNT_NOAC)
2140 *flags |= MS_SYNCHRONOUS;
2141
48b605f8
JL		 2142 /* compare new mount options with old ones */
2143 error = nfs_compare_remount_data(nfss, data);
2144out:
2145 kfree(data);
2146 return error;
2147}
89d77c8f 2148EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2149
f7b422b1 2150/*
54ceac45 2151 * Initialise the common bits of the superblock
f7b422b1 2152 */
fbdefd64 2153inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2154{
54ceac45 2155 struct nfs_server *server = NFS_SB(sb);
5006a76c 2156
54ceac45 2157 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2158
54ceac45
DH		 2159 /* We probably want something more informative here */
2160 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2161 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2162
54ceac45
DH		 2163 if (sb->s_blocksize == 0)
2164 sb->s_blocksize = nfs_block_bits(server->wsize,
2165 &sb->s_blocksize_bits);
f7b422b1 2166
32a88aa1
JA		 2167 sb->s_bdi = &server->backing_dev_info;
2168
54ceac45 2169 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2170}
2171
2172/*
54ceac45 2173 * Finish setting up an NFS2/3 superblock
f7b422b1 2174 */
fbdefd64 2175void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2176{
c40f8d1d 2177 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2178 struct nfs_server *server = NFS_SB(sb);
5006a76c 2179
54ceac45
DH		 2180 sb->s_blocksize_bits = 0;
2181 sb->s_blocksize = 0;
6a74490d
BS		 2182 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2183 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2184 if (data && data->bsize)
54ceac45 2185 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2186
6a74490d 2187 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2188 /* The VFS shouldn't apply the umask to mode bits. We will do
2189 * so ourselves when necessary.
2190 */
2191 sb->s_flags |= MS_POSIXACL;
2192 sb->s_time_gran = 1;
816724e6 2193 }
54ceac45 2194
54ceac45 2195 nfs_initialise_sb(sb);
f7b422b1 2196}
89d77c8f 2197EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2198
2199/*
3cadf4b8 2200 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2201 */
fbdefd64 2202void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2203{
8c958e0c 2204 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2205 struct nfs_server *server = NFS_SB(sb);
2206
2207 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2208 sb->s_blocksize = old_sb->s_blocksize;
2209 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2210 sb->s_xattr = old_sb->s_xattr;
2211 sb->s_op = old_sb->s_op;
2212 sb->s_time_gran = 1;
f7b422b1 2213
3cadf4b8 2214 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2215 /* The VFS shouldn't apply the umask to mode bits. We will do
2216 * so ourselves when necessary.
f7b422b1
DH		 2217 */
2218 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2219 }
2220
54ceac45 2221 nfs_initialise_sb(sb);
f7b422b1
DH		 2222}
2223
275a5d24
TM		 2224static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2225{
2226 const struct nfs_server *a = s->s_fs_info;
2227 const struct rpc_clnt *clnt_a = a->client;
2228 const struct rpc_clnt *clnt_b = b->client;
2229
2230 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2231 goto Ebusy;
2232 if (a->nfs_client != b->nfs_client)
2233 goto Ebusy;
2234 if (a->flags != b->flags)
2235 goto Ebusy;
2236 if (a->wsize != b->wsize)
2237 goto Ebusy;
2238 if (a->rsize != b->rsize)
2239 goto Ebusy;
2240 if (a->acregmin != b->acregmin)
2241 goto Ebusy;
2242 if (a->acregmax != b->acregmax)
2243 goto Ebusy;
2244 if (a->acdirmin != b->acdirmin)
2245 goto Ebusy;
2246 if (a->acdirmax != b->acdirmax)
2247 goto Ebusy;
2248 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2249 goto Ebusy;
e89a5a43 2250 return 1;
275a5d24 2251Ebusy:
e89a5a43
TM		 2252 return 0;
2253}
2254
2255struct nfs_sb_mountdata {
2256 struct nfs_server *server;
2257 int mntflags;
2258};
2259
2260static int nfs_set_super(struct super_block *s, void *data)
2261{
2262 struct nfs_sb_mountdata *sb_mntdata = data;
2263 struct nfs_server *server = sb_mntdata->server;
2264 int ret;
2265
2266 s->s_flags = sb_mntdata->mntflags;
2267 s->s_fs_info = server;
8b244ff2 2268 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2269 ret = set_anon_super(s, server);
2270 if (ret == 0)
2271 server->s_dev = s->s_dev;
2272 return ret;
2273}
2274
fd00a8ff
CL		 2275static int nfs_compare_super_address(struct nfs_server *server1,
2276 struct nfs_server *server2)
2277{
2278 struct sockaddr *sap1, *sap2;
2279
2280 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2281 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2282
2283 if (sap1->sa_family != sap2->sa_family)
2284 return 0;
2285
2286 switch (sap1->sa_family) {
2287 case AF_INET: {
2288 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2289 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2290 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2291 return 0;
2292 if (sin1->sin_port != sin2->sin_port)
2293 return 0;
2294 break;
2295 }
2296 case AF_INET6: {
2297 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2298 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2299 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2300 return 0;
2301 if (sin1->sin6_port != sin2->sin6_port)
2302 return 0;
2303 break;
2304 }
2305 default:
2306 return 0;
2307 }
2308
2309 return 1;
2310}
2311
e89a5a43
TM		 2312static int nfs_compare_super(struct super_block *sb, void *data)
2313{
2314 struct nfs_sb_mountdata *sb_mntdata = data;
2315 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2316 int mntflags = sb_mntdata->mntflags;
2317
fd00a8ff 2318 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2319 return 0;
2320 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2321 if (old->flags & NFS_MOUNT_UNSHARED)
2322 return 0;
2323 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2324 return 0;
2325 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2326}
2327
39ffb921 2328#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2329static void nfs_get_cache_cookie(struct super_block *sb,
2330 struct nfs_parsed_mount_data *parsed,
2331 struct nfs_clone_mount *cloned)
2332{
c4271c6e 2333 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2334 char *uniq = NULL;
2335 int ulen = 0;
2336
c4271c6e
TM		 2337 nfss->fscache_key = NULL;
2338 nfss->fscache = NULL;
2339
2340 if (parsed) {
2341 if (!(parsed->options & NFS_OPTION_FSCACHE))
2342 return;
2343 if (parsed->fscache_uniq) {
2344 uniq = parsed->fscache_uniq;
2345 ulen = strlen(parsed->fscache_uniq);
2346 }
2311b943
BS		 2347 } else if (cloned) {
2348 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2349 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2350 return;
2311b943
BS		 2351 if (mnt_s->fscache_key) {
2352 uniq = mnt_s->fscache_key->key.uniquifier;
2353 ulen = mnt_s->fscache_key->key.uniq_len;
2354 };
c4271c6e
TM		 2355 } else
2356 return;
2311b943
BS		 2357
2358 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2359}
39ffb921
TM		 2360#else
2361static void nfs_get_cache_cookie(struct super_block *sb,
2362 struct nfs_parsed_mount_data *parsed,
2363 struct nfs_clone_mount *cloned)
2364{
2365}
2366#endif
2311b943 2367
fa799759
MS		 2368static int nfs_bdi_register(struct nfs_server *server)
2369{
2370 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2371}
2372
fbdefd64
BS		 2373int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2374 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2375{
2376 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2377}
89d77c8f 2378EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2379
fbdefd64
BS		 2380int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2381 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2382{
2383 /* clone any lsm security options from the parent to the new sb */
2384 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2385 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2386 return -ESTALE;
2387 return 0;
2388}
89d77c8f 2389EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2390
ab7017a3 2391struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2392 int flags, const char *dev_name,
ab7017a3
BS		 2393 struct nfs_mount_info *mount_info,
2394 struct nfs_subversion *nfs_mod)
f7b422b1 2395{
f7b422b1 2396 struct super_block *s;
01194981 2397 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2398 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2399 struct nfs_sb_mountdata sb_mntdata = {
2400 .mntflags = flags,
c40f8d1d 2401 .server = server,
e89a5a43 2402 };
01194981 2403 int error;
33852a1f 2404
75180df2
TM		 2405 if (server->flags & NFS_MOUNT_UNSHARED)
2406 compare_super = NULL;
2407
fb2088cc
SP		 2408 /* -o noac implies -o sync */
2409 if (server->flags & NFS_MOUNT_NOAC)
2410 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2411
54ceac45 2412 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2413 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2414 if (IS_ERR(s)) {
01194981 2415 mntroot = ERR_CAST(s);
54ceac45 2416 goto out_err_nosb;
816724e6
TM		 2417 }
2418
54ceac45
DH		 2419 if (s->s_fs_info != server) {
2420 nfs_free_server(server);
2421 server = NULL;
fa799759
MS		 2422 } else {
2423 error = nfs_bdi_register(server);
01194981
AV		 2424 if (error) {
2425 mntroot = ERR_PTR(error);
cfbc0683 2426 goto error_splat_bdi;
01194981 2427 }
54ceac45 2428 }
f7b422b1 2429
54ceac45
DH		 2430 if (!s->s_root) {
2431 /* initial superblock/root creation */
c40f8d1d 2432 mount_info->fill_super(s, mount_info);
3d176e3f 2433 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2434 }
f7b422b1 2435
87c7083d 2436 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2437 if (IS_ERR(mntroot))
54ceac45 2438 goto error_splat_super;
816724e6 2439
3d176e3f 2440 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2441 if (error)
2442 goto error_splat_root;
2443
54ceac45 2444 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2445
2446out:
01194981 2447 return mntroot;
816724e6 2448
54ceac45
DH		 2449out_err_nosb:
2450 nfs_free_server(server);
0655960f 2451 goto out;
54ceac45 2452
f9c3a380
EP		 2453error_splat_root:
2454 dput(mntroot);
01194981 2455 mntroot = ERR_PTR(error);
54ceac45 2456error_splat_super:
cfbc0683
N		 2457 if (server && !s->s_root)
2458 bdi_unregister(&server->backing_dev_info);
2459error_splat_bdi:
6f5bbff9 2460 deactivate_locked_super(s);
0655960f 2461 goto out;
f7b422b1 2462}
89d77c8f 2463EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2464
fbdefd64 2465struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2466 int flags, const char *dev_name, void *raw_data)
2467{
c40f8d1d
BS		 2468 struct nfs_mount_info mount_info = {
2469 .fill_super = nfs_fill_super,
3d176e3f 2470 .set_security = nfs_set_sb_security,
c40f8d1d 2471 };
c40f8d1d 2472 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2473 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2474 int error;
2475
46058d46 2476 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2477 mount_info.mntfh = nfs_alloc_fhandle();
2478 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2479 goto out;
2480
2481 /* Validate the mount data */
87c7083d 2482 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2483 if (error == NFS_TEXT_DATA)
46058d46 2484 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2485 if (error < 0) {
2486 mntroot = ERR_PTR(error);
2487 goto out;
2488 }
c40f8d1d 2489
ab7017a3
BS		 2490 nfs_mod = get_nfs_version(mount_info.parsed->version);
2491 if (IS_ERR(nfs_mod)) {
2492 mntroot = ERR_CAST(nfs_mod);
2493 goto out;
2494 }
2495
ff9099f2 2496 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2497
2498 put_nfs_version(nfs_mod);
c40f8d1d 2499out:
46058d46 2500 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2501 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2502 return mntroot;
2503}
89d77c8f 2504EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2505
387c149b
TM		 2506/*
2507 * Ensure that we unregister the bdi before kill_anon_super
2508 * releases the device name
2509 */
fbdefd64 2510void nfs_put_super(struct super_block *s)
387c149b
TM		 2511{
2512 struct nfs_server *server = NFS_SB(s);
2513
2514 bdi_unregister(&server->backing_dev_info);
2515}
89d77c8f 2516EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2517
54ceac45
DH		 2518/*
2519 * Destroy an NFS2/3 superblock
2520 */
fbdefd64 2521void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2522{
2523 struct nfs_server *server = NFS_SB(s);
2524
2525 kill_anon_super(s);
08734048 2526 nfs_fscache_release_super_cookie(s);
54ceac45 2527 nfs_free_server(server);
f7b422b1 2528}
89d77c8f 2529EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2530
54ceac45 2531/*
8c958e0c 2532 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2533 */
3dd4f8ef 2534static struct dentry *
e8f25e6d
BS		 2535nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2536 const char *dev_name, void *raw_data)
f7b422b1 2537{
e8f25e6d
BS		 2538 struct nfs_clone_mount *data = raw_data;
2539 struct nfs_mount_info mount_info = {
2540 .fill_super = nfs_clone_super,
2541 .set_security = nfs_clone_sb_security,
2542 .cloned = data,
2543 };
54ceac45 2544 struct nfs_server *server;
3d176e3f 2545 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2546 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
f7b422b1 2547
dee972b9 2548 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2549
e8f25e6d 2550 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2551
54ceac45 2552 /* create a new volume representation */
1179acc6 2553 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
f7b422b1 2554
dee972b9
TM		 2555 if (IS_ERR(server))
2556 mntroot = ERR_CAST(server);
2557 else
2558 mntroot = nfs_fs_mount_common(server, flags,
2559 dev_name, &mount_info, nfs_mod);
24c8dbbb 2560
dee972b9
TM		 2561 dprintk("<-- nfs_xdev_mount() = %ld\n",
2562 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2563 return mntroot;
f7b422b1
DH		 2564}
2565
89d77c8f 2566#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2567
01c3f052
TM		 2568static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2569{
5eebde23
SJ		 2570 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2571 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2572}
2573
f0768ebd
CL		 2574/*
2575 * Validate NFSv4 mount options
2576 */
91ea40b9
TT		 2577static int nfs4_validate_mount_data(void *options,
2578 struct nfs_parsed_mount_data *args,
2579 const char *dev_name)
f0768ebd 2580{
4cfd74fc 2581 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2582 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2583 char *c;
2584
2585 if (data == NULL)
2586 goto out_no_data;
2587
cdf66442
BS		 2588 args->version = 4;
2589
f0768ebd
CL		 2590 switch (data->version) {
2591 case 1:
4c568017
CL		 2592 if (data->host_addrlen > sizeof(args->nfs_server.address))
2593 goto out_no_address;
2594 if (data->host_addrlen == 0)
f0768ebd 2595 goto out_no_address;
4c568017 2596 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2597 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2598 return -EFAULT;
4cfd74fc 2599 if (!nfs_verify_server_address(sap))
f0768ebd 2600 goto out_no_address;
872ece86 2601 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2602
6738b251
CL		 2603 if (data->auth_flavourlen) {
2604 if (data->auth_flavourlen > 1)
2605 goto out_inval_auth;
20c71f5e 2606 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2607 data->auth_flavours,
20c71f5e 2608 sizeof(args->auth_flavors[0])))
f0768ebd 2609 return -EFAULT;
f0768ebd
CL		 2610 }
2611
2612 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2613 if (IS_ERR(c))
2614 return PTR_ERR(c);
91ea40b9 2615 args->nfs_server.hostname = c;
f0768ebd
CL		 2616
2617 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2618 if (IS_ERR(c))
2619 return PTR_ERR(c);
91ea40b9
TT		 2620 args->nfs_server.export_path = c;
2621 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2622
2623 c = strndup_user(data->client_addr.data, 16);
2624 if (IS_ERR(c))
2625 return PTR_ERR(c);
91ea40b9
TT		 2626 args->client_address = c;
2627
2628 /*
2629 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2630 * can deal with.
2631 */
2632
2633 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2634 args->rsize = data->rsize;
2635 args->wsize = data->wsize;
2636 args->timeo = data->timeo;
2637 args->retrans = data->retrans;
2638 args->acregmin = data->acregmin;
2639 args->acregmax = data->acregmax;
2640 args->acdirmin = data->acdirmin;
2641 args->acdirmax = data->acdirmax;
2642 args->nfs_server.protocol = data->proto;
259875ef 2643 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2644
2645 break;
7630c852 2646 default:
b72e4f42 2647 return NFS_TEXT_DATA;
f0768ebd
CL		 2648 }
2649
2650 return 0;
2651
2652out_no_data:
2653 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2654 return -EINVAL;
2655
2656out_inval_auth:
2657 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2658 data->auth_flavourlen);
2659 return -EINVAL;
2660
2661out_no_address:
2662 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2663 return -EINVAL;
f0768ebd
CL		 2664}
2665
fac1e8e4
BS		 2666/*
2667 * NFS v4 module parameters need to stay in the
2668 * NFS client for backwards compatibility
2669 */
2670unsigned int nfs_callback_set_tcpport;
2671unsigned short nfs_callback_tcpport;
2672/* Default cache timeout is 10 minutes */
2673unsigned int nfs_idmap_cache_timeout = 600;
2674/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2675bool nfs4_disable_idmapping = true;
2676unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2677unsigned short send_implementation_id = 1;
6f2ea7f2 2678char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
fac1e8e4 2679
89d77c8f
BS		 2680EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2681EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2682EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2683EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2684EXPORT_SYMBOL_GPL(max_session_slots);
2685EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2686EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
89d77c8f 2687
fac1e8e4
BS		 2688#define NFS_CALLBACK_MAXPORTNR (65535U)
2689
2690static int param_set_portnr(const char *val, const struct kernel_param *kp)
2691{
2692 unsigned long num;
2693 int ret;
2694
2695 if (!val)
2696 return -EINVAL;
7297cb68 2697 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2698 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2699 return -EINVAL;
2700 *((unsigned int *)kp->arg) = num;
2701 return 0;
2702}
2703static struct kernel_param_ops param_ops_portnr = {
2704 .set = param_set_portnr,
2705 .get = param_get_uint,
2706};
2707#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2708
2709module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2710module_param(nfs_idmap_cache_timeout, int, 0644);
2711module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2712module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2713 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2714MODULE_PARM_DESC(nfs4_disable_idmapping,
2715 "Turn off NFSv4 idmapping when using 'sec=sys'");
2716module_param(max_session_slots, ushort, 0644);
2717MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2718 "requests the client will negotiate");
2719module_param(send_implementation_id, ushort, 0644);
2720MODULE_PARM_DESC(send_implementation_id,
2721 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2722MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2723
54ceac45 2724#endif /* CONFIG_NFS_V4 */
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