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NFS: Client implementation of Labeled-NFS
[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,
42c2c424 272 Opt_vers_4_1, Opt_vers_4_2,
0d71b058
TM		 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" },
42c2c424 283 { Opt_vers_4_2, "4.2" },
0d71b058
TM		 284
285 { Opt_vers_err, NULL }
286};
bf0fd768 287
31f43471
AV		 288static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
f7b422b1 290
ab7017a3 291struct file_system_type nfs_fs_type = {
f7b422b1
DH		 292 .owner = THIS_MODULE,
293 .name = "nfs",
01194981 294 .mount = nfs_fs_mount,
f7b422b1 295 .kill_sb = nfs_kill_super,
ecf3d1f1 296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1 297};
7f78e035 298MODULE_ALIAS_FS("nfs");
ddda8e0a 299EXPORT_SYMBOL_GPL(nfs_fs_type);
f7b422b1 300
54ceac45 301struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 302 .owner = THIS_MODULE,
303 .name = "nfs",
31f43471 304 .mount = nfs_xdev_mount,
f7b422b1 305 .kill_sb = nfs_kill_super,
ecf3d1f1 306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 307};
308
6a74490d 309const struct super_operations nfs_sops = {
f7b422b1
DH		 310 .alloc_inode = nfs_alloc_inode,
311 .destroy_inode = nfs_destroy_inode,
312 .write_inode = nfs_write_inode,
eed99357 313 .drop_inode = nfs_drop_inode,
387c149b 314 .put_super = nfs_put_super,
f7b422b1 315 .statfs = nfs_statfs,
b57922d9 316 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
c7f404b4
AV		 319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
f7b422b1 321 .show_stats = nfs_show_stats,
48b605f8 322 .remount_fs = nfs_remount,
f7b422b1 323};
ddda8e0a 324EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 325
89d77c8f 326#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42 327static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 328static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
1ae811ee 330
331struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
ecf3d1f1 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1ae811ee 337};
7f78e035 338MODULE_ALIAS_FS("nfs4");
fa7614dd 339MODULE_ALIAS("nfs4");
1ae811ee 340EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342static int __init register_nfs4_fs(void)
343{
344 return register_filesystem(&nfs4_fs_type);
345}
346
347static void unregister_nfs4_fs(void)
348{
349 unregister_filesystem(&nfs4_fs_type);
350}
351#else
352static int __init register_nfs4_fs(void)
353{
354 return 0;
355}
356
357static void unregister_nfs4_fs(void)
358{
359}
f7b422b1
DH		 360#endif
361
8e1f936b
RR		 362static struct shrinker acl_shrinker = {
363 .shrink = nfs_access_cache_shrinker,
364 .seeks = DEFAULT_SEEKS,
365};
979df72e 366
f7b422b1
DH		 367/*
368 * Register the NFS filesystems
369 */
370int __init register_nfs_fs(void)
371{
372 int ret;
373
374 ret = register_filesystem(&nfs_fs_type);
375 if (ret < 0)
376 goto error_0;
377
1ae811ee 378 ret = register_nfs4_fs();
f7b422b1
DH		 379 if (ret < 0)
380 goto error_1;
1ae811ee 381
382 ret = nfs_register_sysctl();
383 if (ret < 0)
384 goto error_2;
8e1f936b 385 register_shrinker(&acl_shrinker);
f7b422b1
DH		 386 return 0;
387
1ae811ee 388error_2:
389 unregister_nfs4_fs();
f7b422b1
DH		 390error_1:
391 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 392error_0:
393 return ret;
394}
395
396/*
397 * Unregister the NFS filesystems
398 */
399void __exit unregister_nfs_fs(void)
400{
8e1f936b 401 unregister_shrinker(&acl_shrinker);
49af7ee1 402 nfs_unregister_sysctl();
1ae811ee 403 unregister_nfs4_fs();
f7b422b1
DH		 404 unregister_filesystem(&nfs_fs_type);
405}
406
1daef0a8 407void nfs_sb_active(struct super_block *sb)
ef818a28 408{
1daef0a8 409 struct nfs_server *server = NFS_SB(sb);
ef818a28 410
1daef0a8
TM		 411 if (atomic_inc_return(&server->active) == 1)
412 atomic_inc(&sb->s_active);
ef818a28 413}
89d77c8f 414EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 415
1daef0a8 416void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 417{
418 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 419
420 if (atomic_dec_and_test(&server->active))
421 deactivate_super(sb);
ef818a28 422}
89d77c8f 423EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 424
f7b422b1
DH		 425/*
426 * Deliver file system statistics to userspace
427 */
fbdefd64 428int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 429{
0c7d90cf 430 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 431 unsigned char blockbits;
432 unsigned long blockres;
0c7d90cf 433 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 434 struct nfs_fsstat res;
435 int error = -ENOMEM;
436
437 res.fattr = nfs_alloc_fattr();
438 if (res.fattr == NULL)
439 goto out_err;
f7b422b1 440
8fa5c000 441 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 442 if (unlikely(error == -ESTALE)) {
443 struct dentry *pd_dentry;
444
445 pd_dentry = dget_parent(dentry);
446 if (pd_dentry != NULL) {
447 nfs_zap_caches(pd_dentry->d_inode);
448 dput(pd_dentry);
449 }
450 }
ca7e9a0d 451 nfs_free_fattr(res.fattr);
f7b422b1
DH		 452 if (error < 0)
453 goto out_err;
ca7e9a0d 454
1a0ba9ae 455 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 456
457 /*
458 * Current versions of glibc do not correctly handle the
459 * case where f_frsize != f_bsize. Eventually we want to
460 * report the value of wtmult in this field.
461 */
0c7d90cf 462 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 463
464 /*
465 * On most *nix systems, f_blocks, f_bfree, and f_bavail
466 * are reported in units of f_frsize. Linux hasn't had
467 * an f_frsize field in its statfs struct until recently,
468 * thus historically Linux's sys_statfs reports these
469 * fields in units of f_bsize.
470 */
0c7d90cf
DH		 471 buf->f_bsize = dentry->d_sb->s_blocksize;
472 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 473 blockres = (1 << blockbits) - 1;
474 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
475 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
476 buf->f_bavail = (res.abytes + blockres) >> blockbits;
477
478 buf->f_files = res.tfiles;
479 buf->f_ffree = res.afiles;
480
481 buf->f_namelen = server->namelen;
1a0ba9ae 482
f7b422b1
DH		 483 return 0;
484
485 out_err:
3110ff80 486 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 487 return error;
f7b422b1 488}
89d77c8f 489EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 490
7d4e2747
DH		 491/*
492 * Map the security flavour number to a name
493 */
81039f1f
TM		 494static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
495{
7d4e2747 496 static const struct {
81039f1f
TM		 497 rpc_authflavor_t flavour;
498 const char *str;
499 } sec_flavours[] = {
500 { RPC_AUTH_NULL, "null" },
501 { RPC_AUTH_UNIX, "sys" },
502 { RPC_AUTH_GSS_KRB5, "krb5" },
503 { RPC_AUTH_GSS_KRB5I, "krb5i" },
504 { RPC_AUTH_GSS_KRB5P, "krb5p" },
505 { RPC_AUTH_GSS_LKEY, "lkey" },
506 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
507 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
508 { RPC_AUTH_GSS_SPKM, "spkm" },
509 { RPC_AUTH_GSS_SPKMI, "spkmi" },
510 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 511 { UINT_MAX, "unknown" }
81039f1f
TM		 512 };
513 int i;
514
4d81cd16 515 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 516 if (sec_flavours[i].flavour == flavour)
517 break;
518 }
519 return sec_flavours[i].str;
520}
521
ee671b01
JL		 522static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
523 int showdefaults)
524{
525 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
526
527 seq_printf(m, ",mountproto=");
528 switch (sap->sa_family) {
529 case AF_INET:
530 switch (nfss->mountd_protocol) {
531 case IPPROTO_UDP:
532 seq_printf(m, RPCBIND_NETID_UDP);
533 break;
534 case IPPROTO_TCP:
535 seq_printf(m, RPCBIND_NETID_TCP);
536 break;
537 default:
538 if (showdefaults)
539 seq_printf(m, "auto");
540 }
541 break;
542 case AF_INET6:
543 switch (nfss->mountd_protocol) {
544 case IPPROTO_UDP:
545 seq_printf(m, RPCBIND_NETID_UDP6);
546 break;
547 case IPPROTO_TCP:
548 seq_printf(m, RPCBIND_NETID_TCP6);
549 break;
550 default:
551 if (showdefaults)
552 seq_printf(m, "auto");
553 }
554 break;
555 default:
556 if (showdefaults)
557 seq_printf(m, "auto");
558 }
559}
560
82d101d5
CL		 561static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
562 int showdefaults)
563{
564 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
565
d5eff1a3
BS		 566 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
567 return;
568
82d101d5
CL		 569 switch (sap->sa_family) {
570 case AF_INET: {
571 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 572 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 573 break;
574 }
575 case AF_INET6: {
576 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 577 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 578 break;
579 }
580 default:
581 if (showdefaults)
582 seq_printf(m, ",mountaddr=unspecified");
583 }
584
585 if (nfss->mountd_version || showdefaults)
586 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 587 if ((nfss->mountd_port &&
588 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
589 showdefaults)
82d101d5
CL		 590 seq_printf(m, ",mountport=%u", nfss->mountd_port);
591
ee671b01 592 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 593}
594
89d77c8f 595#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 596static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
597 int showdefaults)
598{
599 struct nfs_client *clp = nfss->nfs_client;
600
601 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 602}
603#else
604static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
605 int showdefaults)
606{
607}
608#endif
609
7bbceb6f
TM		 610static void nfs_show_nfs_version(struct seq_file *m,
611 unsigned int version,
612 unsigned int minorversion)
613{
614 seq_printf(m, ",vers=%u", version);
615 if (version == 4)
616 seq_printf(m, ".%u", minorversion);
617}
618
f7b422b1
DH		 619/*
620 * Describe the mount options in force on this server representation
621 */
82d101d5
CL		 622static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
623 int showdefaults)
f7b422b1 624{
509de811 625 static const struct proc_nfs_info {
f7b422b1 626 int flag;
509de811
DH		 627 const char *str;
628 const char *nostr;
f7b422b1
DH		 629 } nfs_info[] = {
630 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 631 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 632 { NFS_MOUNT_NOCTO, ",nocto", "" },
633 { NFS_MOUNT_NOAC, ",noac", "" },
634 { NFS_MOUNT_NONLM, ",nolock", "" },
635 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 636 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 637 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
638 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 639 { 0, NULL, NULL }
640 };
509de811 641 const struct proc_nfs_info *nfs_infop;
8fa5c000 642 struct nfs_client *clp = nfss->nfs_client;
82d101d5 643 u32 version = clp->rpc_ops->version;
7c563cc9 644 int local_flock, local_fcntl;
f7b422b1 645
7bbceb6f 646 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 647 seq_printf(m, ",rsize=%u", nfss->rsize);
648 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 649 if (nfss->bsize != 0)
650 seq_printf(m, ",bsize=%u", nfss->bsize);
651 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 652 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 653 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 654 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 655 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 656 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 657 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 658 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 659 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 660 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
661 if (nfss->flags & nfs_infop->flag)
662 seq_puts(m, nfs_infop->str);
663 else
664 seq_puts(m, nfs_infop->nostr);
665 }
2446ab60 666 rcu_read_lock();
56928edd 667 seq_printf(m, ",proto=%s",
ee671b01 668 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 669 rcu_read_unlock();
82d101d5
CL		 670 if (version == 4) {
671 if (nfss->port != NFS_PORT)
672 seq_printf(m, ",port=%u", nfss->port);
673 } else
674 if (nfss->port)
675 seq_printf(m, ",port=%u", nfss->port);
676
33170233
TM		 677 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
678 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 679 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 680
681 if (version != 4)
682 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 683 else
684 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 685
b797cac7
DH		 686 if (nfss->options & NFS_OPTION_FSCACHE)
687 seq_printf(m, ",fsc");
9b00c643 688
89652617
CL		 689 if (nfss->options & NFS_OPTION_MIGRATION)
690 seq_printf(m, ",migration");
691
9b00c643
PL		 692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
694 seq_printf(m, ",lookupcache=none");
695 else
696 seq_printf(m, ",lookupcache=pos");
697 }
7c563cc9
SJ		 698
699 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
700 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
701
702 if (!local_flock && !local_fcntl)
703 seq_printf(m, ",local_lock=none");
704 else if (local_flock && local_fcntl)
705 seq_printf(m, ",local_lock=all");
706 else if (local_flock)
707 seq_printf(m, ",local_lock=flock");
708 else
709 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 710}
711
712/*
713 * Describe the mount options on this VFS mountpoint
714 */
fbdefd64 715int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 716{
34c80b1d 717 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 718
719 nfs_show_mount_options(m, nfss, 0);
720
2446ab60 721 rcu_read_lock();
5d8515ca
CL		 722 seq_printf(m, ",addr=%s",
723 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
724 RPC_DISPLAY_ADDR));
2446ab60 725 rcu_read_unlock();
f7b422b1
DH		 726
727 return 0;
728}
89d77c8f 729EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 730
89d77c8f 731#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 732#ifdef CONFIG_NFS_V4_1
45402c38 733static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 734{
735 if (nfs4_has_session(server->nfs_client))
736 seq_printf(m, ",sessions");
737}
738#else
45402c38
HS		 739static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
740#endif
ae50c0b5
BF		 741#endif
742
743#ifdef CONFIG_NFS_V4_1
45402c38 744static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 745{
746 seq_printf(m, ",pnfs=");
747 if (server->pnfs_curr_ld)
748 seq_printf(m, "%s", server->pnfs_curr_ld->name);
749 else
750 seq_printf(m, "not configured");
751}
7e03b7cc
TM		 752
753static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
754{
59155546
CL		 755 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
756 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 757 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
758 "date='%llu,%u'",
759 impl_id->name, impl_id->domain,
760 impl_id->date.seconds, impl_id->date.nseconds);
761 }
762}
45402c38 763#else
89d77c8f 764#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 765static void show_pnfs(struct seq_file *m, struct nfs_server *server)
766{
767}
45402c38 768#endif
7e03b7cc
TM		 769static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
770{
771}
45402c38 772#endif
f7b422b1 773
fbdefd64 774int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 775{
776 char *page = (char *) __get_free_page(GFP_KERNEL);
777 char *devname, *dummy;
778 int err = 0;
779 if (!page)
780 return -ENOMEM;
97a54868 781 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 782 if (IS_ERR(devname))
783 err = PTR_ERR(devname);
784 else
785 seq_escape(m, devname, " \t\n\\");
786 free_page((unsigned long)page);
787 return err;
788}
89d77c8f 789EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 790
fbdefd64 791int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 792{
793 seq_puts(m, "/");
794 return 0;
795}
89d77c8f 796EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 797
f7b422b1
DH		 798/*
799 * Present statistical information for this VFS mountpoint
800 */
fbdefd64 801int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 802{
803 int i, cpu;
64132379 804 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 805 struct rpc_auth *auth = nfss->client->cl_auth;
806 struct nfs_iostats totals = { };
807
808 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
809
810 /*
811 * Display all mount option settings
812 */
813 seq_printf(m, "\n\topts:\t");
64132379
AV		 814 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
815 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
816 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 818 nfs_show_mount_options(m, nfss, 1);
819
820 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
821
7e03b7cc 822 show_implementation_id(m, nfss);
7d2ed9ac 823
f7b422b1
DH		 824 seq_printf(m, "\n\tcaps:\t");
825 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 826 seq_printf(m, ",wtmult=%u", nfss->wtmult);
827 seq_printf(m, ",dtsize=%u", nfss->dtsize);
828 seq_printf(m, ",bsize=%u", nfss->bsize);
829 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 830
89d77c8f 831#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 832 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 833 seq_printf(m, "\n\tnfsv4:\t");
834 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
835 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
a09df2ca 836 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
f7b422b1 837 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 838 show_sessions(m, nfss);
839 show_pnfs(m, nfss);
f7b422b1
DH		 840 }
841#endif
842
843 /*
844 * Display security flavor in effect for this mount
845 */
2d767432 846 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 847 if (auth->au_flavor)
2d767432 848 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 849
850 /*
851 * Display superblock I/O counters
852 */
853 for_each_possible_cpu(cpu) {
854 struct nfs_iostats *stats;
855
856 preempt_disable();
857 stats = per_cpu_ptr(nfss->io_stats, cpu);
858
859 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
860 totals.events[i] += stats->events[i];
861 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
862 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 863#ifdef CONFIG_NFS_FSCACHE
864 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
865 totals.fscache[i] += stats->fscache[i];
866#endif
f7b422b1
DH		 867
868 preempt_enable();
869 }
870
871 seq_printf(m, "\n\tevents:\t");
872 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
873 seq_printf(m, "%lu ", totals.events[i]);
874 seq_printf(m, "\n\tbytes:\t");
875 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
876 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 877#ifdef CONFIG_NFS_FSCACHE
878 if (nfss->options & NFS_OPTION_FSCACHE) {
879 seq_printf(m, "\n\tfsc:\t");
880 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
881 seq_printf(m, "%Lu ", totals.bytes[i]);
882 }
883#endif
f7b422b1
DH		 884 seq_printf(m, "\n");
885
886 rpc_print_iostats(m, nfss->client);
887
888 return 0;
889}
89d77c8f 890EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 891
892/*
893 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 894 * in response to xdev traversals and referrals
f7b422b1 895 */
fbdefd64 896void nfs_umount_begin(struct super_block *sb)
f7b422b1 897{
67e55205 898 struct nfs_server *server;
fc6ae3cf
TM		 899 struct rpc_clnt *rpc;
900
67e55205 901 server = NFS_SB(sb);
fc6ae3cf
TM		 902 /* -EIO all pending I/O */
903 rpc = server->client_acl;
904 if (!IS_ERR(rpc))
905 rpc_killall_tasks(rpc);
906 rpc = server->client;
907 if (!IS_ERR(rpc))
908 rpc_killall_tasks(rpc);
f7b422b1 909}
89d77c8f 910EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 911
db833351 912static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 913{
914 struct nfs_parsed_mount_data *data;
915
916 data = kzalloc(sizeof(*data), GFP_KERNEL);
917 if (data) {
9423a08a
CL		 918 data->acregmin = NFS_DEF_ACREGMIN;
919 data->acregmax = NFS_DEF_ACREGMAX;
920 data->acdirmin = NFS_DEF_ACDIRMIN;
921 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 922 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 923 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 924 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
4580a92d 925 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
9423a08a
CL		 926 data->auth_flavor_len = 1;
927 data->minorversion = 0;
b72e4f42 928 data->need_mount = true;
9937347a 929 data->net = current->nsproxy->net_ns;
8a0d551a 930 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 931 }
932 return data;
933}
934
8a0d551a
JL		 935static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
936{
937 if (data) {
938 kfree(data->client_address);
939 kfree(data->mount_server.hostname);
940 kfree(data->nfs_server.export_path);
941 kfree(data->nfs_server.hostname);
942 kfree(data->fscache_uniq);
943 security_free_mnt_opts(&data->lsm_opts);
944 kfree(data);
945 }
946}
947
fc50d58f 948/*
cdcd7f9a
CL		 949 * Sanity-check a server address provided by the mount command.
950 *
951 * Address family must be initialized, and address must not be
952 * the ANY address for that family.
fc50d58f
CL		 953 */
954static int nfs_verify_server_address(struct sockaddr *addr)
955{
956 switch (addr->sa_family) {
957 case AF_INET: {
cdcd7f9a 958 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 959 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 960 }
961 case AF_INET6: {
962 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
963 return !ipv6_addr_any(sa);
fc50d58f
CL		 964 }
965 }
966
53a0b9c4 967 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 968 return 0;
969}
970
4cfd74fc
CL		 971/*
972 * Select between a default port value and a user-specified port value.
973 * If a zero value is set, then autobind will be used.
974 */
f5855fec 975static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 976 const unsigned short default_port)
977{
f5855fec
TM		 978 if (*port == NFS_UNSPEC_PORT)
979 *port = default_port;
4cfd74fc 980
f5855fec 981 rpc_set_port(sap, *port);
4cfd74fc
CL		 982}
983
259875ef
TM		 984/*
985 * Sanity check the NFS transport protocol.
986 *
987 */
988static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
989{
990 switch (mnt->nfs_server.protocol) {
991 case XPRT_TRANSPORT_UDP:
992 case XPRT_TRANSPORT_TCP:
993 case XPRT_TRANSPORT_RDMA:
994 break;
995 default:
996 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
997 }
998}
999
1000/*
1001 * For text based NFSv2/v3 mounts, the mount protocol transport default
1002 * settings should depend upon the specified NFS transport.
1003 */
1004static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1005{
1006 nfs_validate_transport_protocol(mnt);
1007
1008 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1009 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1010 return;
1011 switch (mnt->nfs_server.protocol) {
1012 case XPRT_TRANSPORT_UDP:
1013 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1014 break;
1015 case XPRT_TRANSPORT_TCP:
1016 case XPRT_TRANSPORT_RDMA:
1017 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1018 }
1019}
1020
01060c89
CL		 1021/*
1022 * Parse the value of the 'sec=' option.
01060c89
CL		 1023 */
1024static int nfs_parse_security_flavors(char *value,
1025 struct nfs_parsed_mount_data *mnt)
1026{
1027 substring_t args[MAX_OPT_ARGS];
1028
1029 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1030
1031 switch (match_token(value, nfs_secflavor_tokens, args)) {
1032 case Opt_sec_none:
01060c89
CL		 1033 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1034 break;
1035 case Opt_sec_sys:
01060c89
CL		 1036 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1037 break;
1038 case Opt_sec_krb5:
01060c89
CL		 1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1040 break;
1041 case Opt_sec_krb5i:
01060c89
CL		 1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1043 break;
1044 case Opt_sec_krb5p:
01060c89
CL		 1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1046 break;
1047 case Opt_sec_lkey:
01060c89
CL		 1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1049 break;
1050 case Opt_sec_lkeyi:
01060c89
CL		 1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1052 break;
1053 case Opt_sec_lkeyp:
01060c89
CL		 1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1055 break;
1056 case Opt_sec_spkm:
01060c89
CL		 1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1058 break;
1059 case Opt_sec_spkmi:
01060c89
CL		 1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1061 break;
1062 case Opt_sec_spkmp:
01060c89
CL		 1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1064 break;
1065 default:
1066 return 0;
1067 }
1068
9b7160c5 1069 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1070 mnt->auth_flavor_len = 1;
01060c89
CL		 1071 return 1;
1072}
1073
0d71b058
TM		 1074static int nfs_parse_version_string(char *string,
1075 struct nfs_parsed_mount_data *mnt,
1076 substring_t *args)
1077{
1078 mnt->flags &= ~NFS_MOUNT_VER3;
1079 switch (match_token(string, nfs_vers_tokens, args)) {
1080 case Opt_vers_2:
1081 mnt->version = 2;
1082 break;
1083 case Opt_vers_3:
1084 mnt->flags |= NFS_MOUNT_VER3;
1085 mnt->version = 3;
1086 break;
1087 case Opt_vers_4:
1088 /* Backward compatibility option. In future,
1089 * the mount program should always supply
1090 * a NFSv4 minor version number.
1091 */
1092 mnt->version = 4;
1093 break;
1094 case Opt_vers_4_0:
1095 mnt->version = 4;
1096 mnt->minorversion = 0;
1097 break;
1098 case Opt_vers_4_1:
1099 mnt->version = 4;
1100 mnt->minorversion = 1;
1101 break;
42c2c424
SD		 1102 case Opt_vers_4_2:
1103 mnt->version = 4;
1104 mnt->minorversion = 2;
1105 break;
0d71b058
TM		 1106 default:
1107 return 0;
1108 }
1109 return 1;
1110}
1111
c5cb09b6
RL		 1112static int nfs_get_option_str(substring_t args[], char **option)
1113{
1114 kfree(*option);
1115 *option = match_strdup(args);
e25fbe38 1116 return !*option;
c5cb09b6
RL		 1117}
1118
1119static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1120{
1121 int rc;
1122 char *string;
1123
1124 string = match_strdup(args);
1125 if (string == NULL)
1126 return -ENOMEM;
7297cb68 1127 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1128 kfree(string);
1129
1130 return rc;
1131}
1132
bf0fd768
CL		 1133/*
1134 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1135 * a data structure. The whole mount string is processed; bad options are
1136 * skipped as they are encountered. If there were no errors, return 1;
1137 * otherwise return 0 (zero).
bf0fd768
CL		 1138 */
1139static int nfs_parse_mount_options(char *raw,
1140 struct nfs_parsed_mount_data *mnt)
1141{
f9c3a380 1142 char *p, *string, *secdata;
d23c45fd 1143 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1144 unsigned short protofamily = AF_UNSPEC;
1145 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1146
1147 if (!raw) {
1148 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1149 return 1;
1150 }
1151 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1152
f9c3a380
EP		 1153 secdata = alloc_secdata();
1154 if (!secdata)
1155 goto out_nomem;
1156
1157 rc = security_sb_copy_data(raw, secdata);
1158 if (rc)
1159 goto out_security_failure;
1160
1161 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1162 if (rc)
1163 goto out_security_failure;
1164
1165 free_secdata(secdata);
1166
bf0fd768
CL		 1167 while ((p = strsep(&raw, ",")) != NULL) {
1168 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1169 unsigned long option;
1170 int token;
bf0fd768
CL		 1171
1172 if (!*p)
1173 continue;
1174
1175 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1176
1177 token = match_token(p, nfs_mount_option_tokens, args);
1178 switch (token) {
f45663ce
CL		 1179
1180 /*
1181 * boolean options: foo/nofoo
1182 */
bf0fd768
CL		 1183 case Opt_soft:
1184 mnt->flags |= NFS_MOUNT_SOFT;
1185 break;
1186 case Opt_hard:
1187 mnt->flags &= ~NFS_MOUNT_SOFT;
1188 break;
bf0fd768
CL		 1189 case Opt_posix:
1190 mnt->flags |= NFS_MOUNT_POSIX;
1191 break;
1192 case Opt_noposix:
1193 mnt->flags &= ~NFS_MOUNT_POSIX;
1194 break;
1195 case Opt_cto:
1196 mnt->flags &= ~NFS_MOUNT_NOCTO;
1197 break;
1198 case Opt_nocto:
1199 mnt->flags |= NFS_MOUNT_NOCTO;
1200 break;
1201 case Opt_ac:
1202 mnt->flags &= ~NFS_MOUNT_NOAC;
1203 break;
1204 case Opt_noac:
1205 mnt->flags |= NFS_MOUNT_NOAC;
1206 break;
1207 case Opt_lock:
1208 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1209 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1210 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1211 break;
1212 case Opt_nolock:
1213 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1214 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1215 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1216 break;
bf0fd768
CL		 1217 case Opt_udp:
1218 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1219 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1220 break;
1221 case Opt_tcp:
1222 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1223 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1224 break;
2cf7ff7a
TT		 1225 case Opt_rdma:
1226 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1227 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1228 xprt_load_transport(p);
2cf7ff7a 1229 break;
bf0fd768
CL		 1230 case Opt_acl:
1231 mnt->flags &= ~NFS_MOUNT_NOACL;
1232 break;
1233 case Opt_noacl:
1234 mnt->flags |= NFS_MOUNT_NOACL;
1235 break;
1236 case Opt_rdirplus:
1237 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1238 break;
1239 case Opt_nordirplus:
1240 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1241 break;
75180df2
TM		 1242 case Opt_sharecache:
1243 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1244 break;
1245 case Opt_nosharecache:
1246 mnt->flags |= NFS_MOUNT_UNSHARED;
1247 break;
d740351b
CL		 1248 case Opt_resvport:
1249 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1250 break;
1251 case Opt_noresvport:
1252 mnt->flags |= NFS_MOUNT_NORESVPORT;
1253 break;
b797cac7
DH		 1254 case Opt_fscache:
1255 mnt->options |= NFS_OPTION_FSCACHE;
1256 kfree(mnt->fscache_uniq);
1257 mnt->fscache_uniq = NULL;
1258 break;
1259 case Opt_nofscache:
1260 mnt->options &= ~NFS_OPTION_FSCACHE;
1261 kfree(mnt->fscache_uniq);
1262 mnt->fscache_uniq = NULL;
1263 break;
89652617
CL		 1264 case Opt_migration:
1265 mnt->options |= NFS_OPTION_MIGRATION;
1266 break;
1267 case Opt_nomigration:
1268 mnt->options &= NFS_OPTION_MIGRATION;
1269 break;
bf0fd768 1270
f45663ce
CL		 1271 /*
1272 * options that take numeric values
1273 */
bf0fd768 1274 case Opt_port:
c5cb09b6
RL		 1275 if (nfs_get_option_ul(args, &option) ||
1276 option > USHRT_MAX)
d23c45fd
CL		 1277 goto out_invalid_value;
1278 mnt->nfs_server.port = option;
bf0fd768
CL		 1279 break;
1280 case Opt_rsize:
c5cb09b6 1281 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1282 goto out_invalid_value;
1283 mnt->rsize = option;
bf0fd768
CL		 1284 break;
1285 case Opt_wsize:
c5cb09b6 1286 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1287 goto out_invalid_value;
1288 mnt->wsize = option;
bf0fd768
CL		 1289 break;
1290 case Opt_bsize:
c5cb09b6 1291 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1292 goto out_invalid_value;
1293 mnt->bsize = option;
bf0fd768
CL		 1294 break;
1295 case Opt_timeo:
c5cb09b6 1296 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1297 goto out_invalid_value;
1298 mnt->timeo = option;
bf0fd768
CL		 1299 break;
1300 case Opt_retrans:
c5cb09b6 1301 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1302 goto out_invalid_value;
1303 mnt->retrans = option;
bf0fd768
CL		 1304 break;
1305 case Opt_acregmin:
c5cb09b6 1306 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1307 goto out_invalid_value;
1308 mnt->acregmin = option;
bf0fd768
CL		 1309 break;
1310 case Opt_acregmax:
c5cb09b6 1311 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1312 goto out_invalid_value;
1313 mnt->acregmax = option;
bf0fd768
CL		 1314 break;
1315 case Opt_acdirmin:
c5cb09b6 1316 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1317 goto out_invalid_value;
1318 mnt->acdirmin = option;
bf0fd768
CL		 1319 break;
1320 case Opt_acdirmax:
c5cb09b6 1321 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1322 goto out_invalid_value;
1323 mnt->acdirmax = option;
bf0fd768
CL		 1324 break;
1325 case Opt_actimeo:
c5cb09b6 1326 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1327 goto out_invalid_value;
1328 mnt->acregmin = mnt->acregmax =
1329 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1330 break;
1331 case Opt_namelen:
c5cb09b6 1332 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1333 goto out_invalid_value;
1334 mnt->namlen = option;
bf0fd768
CL		 1335 break;
1336 case Opt_mountport:
c5cb09b6
RL		 1337 if (nfs_get_option_ul(args, &option) ||
1338 option > USHRT_MAX)
d23c45fd
CL		 1339 goto out_invalid_value;
1340 mnt->mount_server.port = option;
bf0fd768 1341 break;
bf0fd768 1342 case Opt_mountvers:
c5cb09b6 1343 if (nfs_get_option_ul(args, &option) ||
f45663ce 1344 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1345 option > NFS_MNT3_VERSION)
1346 goto out_invalid_value;
1347 mnt->mount_server.version = option;
bf0fd768 1348 break;
3fd5be9e 1349 case Opt_minorversion:
c5cb09b6 1350 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1351 goto out_invalid_value;
1352 if (option > NFS4_MAX_MINOR_VERSION)
1353 goto out_invalid_value;
1354 mnt->minorversion = option;
3fd5be9e 1355 break;
bf0fd768 1356
f45663ce
CL		 1357 /*
1358 * options that take text values
1359 */
0d71b058
TM		 1360 case Opt_nfsvers:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 rc = nfs_parse_version_string(string, mnt, args);
1365 kfree(string);
1366 if (!rc)
1367 goto out_invalid_value;
1368 break;
bf0fd768
CL		 1369 case Opt_sec:
1370 string = match_strdup(args);
1371 if (string == NULL)
1372 goto out_nomem;
01060c89 1373 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1374 kfree(string);
f45663ce 1375 if (!rc) {
f45663ce
CL		 1376 dfprintk(MOUNT, "NFS: unrecognized "
1377 "security flavor\n");
d23c45fd 1378 return 0;
f45663ce 1379 }
bf0fd768
CL		 1380 break;
1381 case Opt_proto:
1382 string = match_strdup(args);
1383 if (string == NULL)
1384 goto out_nomem;
1385 token = match_token(string,
1386 nfs_xprt_protocol_tokens, args);
bf0fd768 1387
ee671b01 1388 protofamily = AF_INET;
bf0fd768 1389 switch (token) {
ee671b01
JL		 1390 case Opt_xprt_udp6:
1391 protofamily = AF_INET6;
fdb66ff4 1392 case Opt_xprt_udp:
bf0fd768 1393 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1395 break;
ee671b01
JL		 1396 case Opt_xprt_tcp6:
1397 protofamily = AF_INET6;
fdb66ff4 1398 case Opt_xprt_tcp:
bf0fd768 1399 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1400 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1401 break;
2cf7ff7a
TT		 1402 case Opt_xprt_rdma:
1403 /* vector side protocols to TCP */
1404 mnt->flags |= NFS_MOUNT_TCP;
1405 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1406 xprt_load_transport(string);
2cf7ff7a 1407 break;
bf0fd768 1408 default:
f45663ce
CL		 1409 dfprintk(MOUNT, "NFS: unrecognized "
1410 "transport protocol\n");
4223a4a1 1411 kfree(string);
d23c45fd 1412 return 0;
bf0fd768 1413 }
c5cb09b6 1414 kfree(string);
bf0fd768
CL		 1415 break;
1416 case Opt_mountproto:
1417 string = match_strdup(args);
1418 if (string == NULL)
1419 goto out_nomem;
1420 token = match_token(string,
1421 nfs_xprt_protocol_tokens, args);
d508afb4 1422 kfree(string);
bf0fd768 1423
ee671b01 1424 mountfamily = AF_INET;
bf0fd768 1425 switch (token) {
ee671b01
JL		 1426 case Opt_xprt_udp6:
1427 mountfamily = AF_INET6;
fdb66ff4 1428 case Opt_xprt_udp:
0896a725 1429 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1430 break;
ee671b01
JL		 1431 case Opt_xprt_tcp6:
1432 mountfamily = AF_INET6;
fdb66ff4 1433 case Opt_xprt_tcp:
0896a725 1434 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1435 break;
2cf7ff7a 1436 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1437 default:
f45663ce
CL		 1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
d23c45fd 1440 return 0;
bf0fd768
CL		 1441 }
1442 break;
1443 case Opt_addr:
1444 string = match_strdup(args);
1445 if (string == NULL)
1446 goto out_nomem;
53a0b9c4 1447 mnt->nfs_server.addrlen =
b48e1278 1448 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1449 (struct sockaddr *)
1450 &mnt->nfs_server.address,
1451 sizeof(mnt->nfs_server.address));
bf0fd768 1452 kfree(string);
53a0b9c4
CL		 1453 if (mnt->nfs_server.addrlen == 0)
1454 goto out_invalid_address;
bf0fd768
CL		 1455 break;
1456 case Opt_clientaddr:
c5cb09b6 1457 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1458 goto out_nomem;
bf0fd768 1459 break;
33832034 1460 case Opt_mounthost:
c5cb09b6
RL		 1461 if (nfs_get_option_str(args,
1462 &mnt->mount_server.hostname))
33832034 1463 goto out_nomem;
33832034 1464 break;
0ac83779 1465 case Opt_mountaddr:
bf0fd768
CL		 1466 string = match_strdup(args);
1467 if (string == NULL)
1468 goto out_nomem;
53a0b9c4 1469 mnt->mount_server.addrlen =
b48e1278 1470 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1471 (struct sockaddr *)
1472 &mnt->mount_server.address,
1473 sizeof(mnt->mount_server.address));
bf0fd768 1474 kfree(string);
53a0b9c4
CL		 1475 if (mnt->mount_server.addrlen == 0)
1476 goto out_invalid_address;
bf0fd768 1477 break;
7973c1f1
TM		 1478 case Opt_lookupcache:
1479 string = match_strdup(args);
1480 if (string == NULL)
1481 goto out_nomem;
1482 token = match_token(string,
1483 nfs_lookupcache_tokens, args);
1484 kfree(string);
1485 switch (token) {
1486 case Opt_lookupcache_all:
1487 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1488 break;
1489 case Opt_lookupcache_positive:
1490 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1491 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1492 break;
1493 case Opt_lookupcache_none:
1494 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1495 break;
1496 default:
7973c1f1
TM		 1497 dfprintk(MOUNT, "NFS: invalid "
1498 "lookupcache argument\n");
d23c45fd 1499 return 0;
7973c1f1
TM		 1500 };
1501 break;
a6d5ff64 1502 case Opt_fscache_uniq:
c5cb09b6 1503 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1504 goto out_nomem;
a6d5ff64
CL		 1505 mnt->options |= NFS_OPTION_FSCACHE;
1506 break;
5eebde23
SJ		 1507 case Opt_local_lock:
1508 string = match_strdup(args);
1509 if (string == NULL)
1510 goto out_nomem;
1511 token = match_token(string, nfs_local_lock_tokens,
1512 args);
1513 kfree(string);
1514 switch (token) {
1515 case Opt_local_lock_all:
1516 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1517 NFS_MOUNT_LOCAL_FCNTL);
1518 break;
1519 case Opt_local_lock_flock:
1520 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1521 break;
1522 case Opt_local_lock_posix:
1523 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1524 break;
1525 case Opt_local_lock_none:
1526 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1527 NFS_MOUNT_LOCAL_FCNTL);
1528 break;
1529 default:
1530 dfprintk(MOUNT, "NFS: invalid "
1531 "local_lock argument\n");
1532 return 0;
1533 };
1534 break;
bf0fd768 1535
f45663ce
CL		 1536 /*
1537 * Special options
1538 */
1539 case Opt_sloppy:
1540 sloppy = 1;
1541 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1542 break;
bf0fd768
CL		 1543 case Opt_userspace:
1544 case Opt_deprecated:
d33e4dfe
CL		 1545 dfprintk(MOUNT, "NFS: ignoring mount option "
1546 "'%s'\n", p);
bf0fd768
CL		 1547 break;
1548
1549 default:
d23c45fd 1550 invalid_option = 1;
f45663ce
CL		 1551 dfprintk(MOUNT, "NFS: unrecognized mount option "
1552 "'%s'\n", p);
bf0fd768
CL		 1553 }
1554 }
1555
d23c45fd
CL		 1556 if (!sloppy && invalid_option)
1557 return 0;
1558
571b7554
WAA		 1559 if (mnt->minorversion && mnt->version != 4)
1560 goto out_minorversion_mismatch;
1561
89652617
CL		 1562 if (mnt->options & NFS_OPTION_MIGRATION &&
1563 mnt->version != 4 && mnt->minorversion != 0)
1564 goto out_migration_misuse;
1565
ee671b01
JL		 1566 /*
1567 * verify that any proto=/mountproto= options match the address
1856b225 1568 * families in the addr=/mountaddr= options.
ee671b01
JL		 1569 */
1570 if (protofamily != AF_UNSPEC &&
1571 protofamily != mnt->nfs_server.address.ss_family)
1572 goto out_proto_mismatch;
1573
1574 if (mountfamily != AF_UNSPEC) {
1575 if (mnt->mount_server.addrlen) {
1576 if (mountfamily != mnt->mount_server.address.ss_family)
1577 goto out_mountproto_mismatch;
1578 } else {
1579 if (mountfamily != mnt->nfs_server.address.ss_family)
1580 goto out_mountproto_mismatch;
1581 }
1582 }
1583
bf0fd768
CL		 1584 return 1;
1585
ee671b01
JL		 1586out_mountproto_mismatch:
1587 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1588 "option\n");
1589 return 0;
1590out_proto_mismatch:
1591 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1592 return 0;
53a0b9c4
CL		 1593out_invalid_address:
1594 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1595 return 0;
d23c45fd 1596out_invalid_value:
53a0b9c4 1597 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1598 return 0;
571b7554
WAA		 1599out_minorversion_mismatch:
1600 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1601 "minorversion=%u\n", mnt->version, mnt->minorversion);
1602 return 0;
89652617
CL		 1603out_migration_misuse:
1604 printk(KERN_INFO
1605 "NFS: 'migration' not supported for this NFS version\n");
1606 return 0;
bf0fd768
CL		 1607out_nomem:
1608 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1609 return 0;
f9c3a380
EP		 1610out_security_failure:
1611 free_secdata(secdata);
1612 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1613 return 0;
bf0fd768
CL		 1614}
1615
ec88f28d 1616/*
4580a92d
CL		 1617 * Select a security flavor for this mount. The selected flavor
1618 * is planted in args->auth_flavors[0].
d497ab97
WAA		 1619 *
1620 * Returns 0 on success, -EACCES on failure.
ec88f28d 1621 */
d497ab97 1622static int nfs_select_flavor(struct nfs_parsed_mount_data *args,
4580a92d 1623 struct nfs_mount_request *request)
ec88f28d 1624{
4580a92d
CL		 1625 unsigned int i, count = *(request->auth_flav_len);
1626 rpc_authflavor_t flavor;
1627
4580a92d
CL		 1628 /*
1629 * The NFSv2 MNT operation does not return a flavor list.
1630 */
1631 if (args->mount_server.version != NFS_MNT3_VERSION)
1632 goto out_default;
ec88f28d 1633
5eecfde6
CL		 1634 /*
1635 * Certain releases of Linux's mountd return an empty
4580a92d 1636 * flavor list in some cases.
5eecfde6 1637 */
4580a92d
CL		 1638 if (count == 0)
1639 goto out_default;
5eecfde6 1640
d497ab97
WAA		 1641 /*
1642 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1643 * must be in the list returned by the server.
1644 *
1645 * AUTH_NULL has a special meaning when it's in the server list - it
1646 * means that the server will ignore the rpc creds, so any flavor
1647 * can be used.
1648 */
1649 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR) {
1650 for (i = 0; i < count; i++) {
1651 if (args->auth_flavors[0] == request->auth_flavs[i] ||
1652 request->auth_flavs[i] == RPC_AUTH_NULL)
1653 goto out;
1654 }
1655 dfprintk(MOUNT, "NFS: auth flavor %d not supported by server\n",
1656 args->auth_flavors[0]);
1657 goto out_err;
1658 }
1659
ec88f28d 1660 /*
ec88f28d
CL		 1661 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1662 * flavor listed first. However, some servers list
4580a92d 1663 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
ec88f28d 1664 */
4580a92d
CL		 1665 for (i = 0; i < count; i++) {
1666 struct rpcsec_gss_info info;
1667
1668 flavor = request->auth_flavs[i];
1669 switch (flavor) {
1670 case RPC_AUTH_UNIX:
1671 goto out_set;
1672 case RPC_AUTH_NULL:
1673 continue;
1674 default:
1675 if (rpcauth_get_gssinfo(flavor, &info) == 0)
1676 goto out_set;
1677 }
1678 }
ec88f28d 1679
d497ab97
WAA		 1680 /*
1681 * As a last chance, see if the server list contains AUTH_NULL -
1682 * if it does, use the default flavor.
1683 */
1684 for (i = 0; i < count; i++) {
1685 if (request->auth_flavs[i] == RPC_AUTH_NULL)
1686 goto out_default;
1687 }
1688
1689 dfprintk(MOUNT, "NFS: no auth flavors in common with server\n");
1690 goto out_err;
1691
4580a92d 1692out_default:
d497ab97
WAA		 1693 /* use default if flavor not already set */
1694 flavor = (args->auth_flavors[0] == RPC_AUTH_MAXFLAVOR) ?
1695 RPC_AUTH_UNIX : args->auth_flavors[0];
4580a92d
CL		 1696out_set:
1697 args->auth_flavors[0] = flavor;
1698out:
1699 dfprintk(MOUNT, "NFS: using auth flavor %d\n", args->auth_flavors[0]);
d497ab97
WAA		 1700 return 0;
1701out_err:
1702 return -EACCES;
ec88f28d
CL		 1703}
1704
0076d7b7
CL		 1705/*
1706 * Use the remote server's MOUNT service to request the NFS file handle
1707 * corresponding to the provided path.
1708 */
486aa699
BS		 1709static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1710 struct nfs_fh *root_fh)
0076d7b7 1711{
ec88f28d
CL		 1712 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1713 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1714 struct nfs_mount_request request = {
1715 .sap = (struct sockaddr *)
1716 &args->mount_server.address,
1717 .dirpath = args->nfs_server.export_path,
1718 .protocol = args->mount_server.protocol,
1719 .fh = root_fh,
50a737f8 1720 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1721 .auth_flav_len = &server_authlist_len,
1722 .auth_flavs = server_authlist,
6d59b8d5 1723 .net = args->net,
c5d120f8 1724 };
4c568017 1725 int status;
0076d7b7
CL		 1726
1727 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1728 switch (args->version) {
1729 default:
1730 args->mount_server.version = NFS_MNT3_VERSION;
1731 break;
1732 case 2:
1733 args->mount_server.version = NFS_MNT_VERSION;
1734 }
0076d7b7 1735 }
c5d120f8 1736 request.version = args->mount_server.version;
0076d7b7 1737
33832034 1738 if (args->mount_server.hostname)
c5d120f8 1739 request.hostname = args->mount_server.hostname;
33832034 1740 else
c5d120f8 1741 request.hostname = args->nfs_server.hostname;
33832034 1742
0076d7b7
CL		 1743 /*
1744 * Construct the mount server's address.
1745 */
4c568017 1746 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1747 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1748 args->nfs_server.addrlen);
1749 args->mount_server.addrlen = args->nfs_server.addrlen;
1750 }
c5d120f8 1751 request.salen = args->mount_server.addrlen;
f5855fec 1752 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1753
1754 /*
1755 * Now ask the mount server to map our export path
1756 * to a file handle.
1757 */
c5d120f8 1758 status = nfs_mount(&request);
ec88f28d
CL		 1759 if (status != 0) {
1760 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1761 request.hostname, status);
1762 return status;
1763 }
0076d7b7 1764
d497ab97 1765 return nfs_select_flavor(args, &request);
0076d7b7
CL		 1766}
1767
ff9099f2
BS		 1768struct dentry *nfs_try_mount(int flags, const char *dev_name,
1769 struct nfs_mount_info *mount_info,
1770 struct nfs_subversion *nfs_mod)
486aa699
BS		 1771{
1772 int status;
1773 struct nfs_server *server;
1774
b72e4f42 1775 if (mount_info->parsed->need_mount) {
87c7083d 1776 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1777 if (status)
1778 return ERR_PTR(status);
1779 }
486aa699
BS		 1780
1781 /* Get a volume representation */
1179acc6 1782 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699
BS		 1783 if (IS_ERR(server))
1784 return ERR_CAST(server);
1785
ab7017a3 1786 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1787}
ddda8e0a 1788EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1789
c12bacec
RL		 1790/*
1791 * Split "dev_name" into "hostname:export_path".
1792 *
1793 * The leftmost colon demarks the split between the server's hostname
1794 * and the export path. If the hostname starts with a left square
1795 * bracket, then it may contain colons.
1796 *
1797 * Note: caller frees hostname and export path, even on error.
1798 */
1799static int nfs_parse_devname(const char *dev_name,
1800 char **hostname, size_t maxnamlen,
1801 char **export_path, size_t maxpathlen)
dc045898
CL		 1802{
1803 size_t len;
c12bacec 1804 char *end;
dc045898 1805
c12bacec
RL		 1806 /* Is the host name protected with square brakcets? */
1807 if (*dev_name == '[') {
1808 end = strchr(++dev_name, ']');
1809 if (end == NULL || end[1] != ':')
dc045898 1810 goto out_bad_devname;
dc045898 1811
c12bacec
RL		 1812 len = end - dev_name;
1813 end++;
1814 } else {
1815 char *comma;
dc045898 1816
c12bacec
RL		 1817 end = strchr(dev_name, ':');
1818 if (end == NULL)
1819 goto out_bad_devname;
1820 len = end - dev_name;
d1aa0825 1821
c12bacec
RL		 1822 /* kill possible hostname list: not supported */
1823 comma = strchr(dev_name, ',');
1824 if (comma != NULL && comma < end)
1825 *comma = 0;
1826 }
d1aa0825 1827
d1aa0825
CL		 1828 if (len > maxnamlen)
1829 goto out_hostname;
1830
1831 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1832 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1833 if (*hostname == NULL)
1834 goto out_nomem;
c12bacec 1835 len = strlen(++end);
d1aa0825
CL		 1836 if (len > maxpathlen)
1837 goto out_path;
1838 *export_path = kstrndup(end, len, GFP_KERNEL);
1839 if (!*export_path)
1840 goto out_nomem;
1841
c12bacec 1842 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1843 return 0;
1844
1845out_bad_devname:
1846 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1847 return -EINVAL;
1848
1849out_nomem:
1850 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1851 return -ENOMEM;
1852
1853out_hostname:
1854 dfprintk(MOUNT, "NFS: server hostname too long\n");
1855 return -ENAMETOOLONG;
1856
1857out_path:
1858 dfprintk(MOUNT, "NFS: export pathname too long\n");
1859 return -ENAMETOOLONG;
1860}
1861
f7b422b1 1862/*
54ceac45
DH		 1863 * Validate the NFS2/NFS3 mount data
1864 * - fills in the mount root filehandle
136d558c
CL		 1865 *
1866 * For option strings, user space handles the following behaviors:
1867 *
1868 * + DNS: mapping server host name to IP address ("addr=" option)
1869 *
1870 * + failure mode: how to behave if a mount request can't be handled
1871 * immediately ("fg/bg" option)
1872 *
1873 * + retry: how often to retry a mount request ("retry=" option)
1874 *
1875 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1876 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1877 */
d72c727c
BS		 1878static int nfs23_validate_mount_data(void *options,
1879 struct nfs_parsed_mount_data *args,
1880 struct nfs_fh *mntfh,
1881 const char *dev_name)
f7b422b1 1882{
2283f8d6 1883 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1884 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1885
5df36e78
CL		 1886 if (data == NULL)
1887 goto out_no_data;
f7b422b1 1888
c5afc8da 1889 args->version = NFS_DEFAULT_VERSION;
54ceac45 1890 switch (data->version) {
5df36e78
CL		 1891 case 1:
1892 data->namlen = 0;
1893 case 2:
1894 data->bsize = 0;
1895 case 3:
1896 if (data->flags & NFS_MOUNT_VER3)
1897 goto out_no_v3;
1898 data->root.size = NFS2_FHSIZE;
1899 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1900 case 4:
1901 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1902 goto out_no_sec;
1903 case 5:
1904 memset(data->context, 0, sizeof(data->context));
1905 case 6:
b7e24457
TM		 1906 if (data->flags & NFS_MOUNT_VER3) {
1907 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1908 goto out_invalid_fh;
5df36e78 1909 mntfh->size = data->root.size;
764302cc
CL		 1910 args->version = 3;
1911 } else {
5df36e78 1912 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1913 args->version = 2;
1914 }
5df36e78 1915
5df36e78
CL		 1916
1917 memcpy(mntfh->data, data->root.data, mntfh->size);
1918 if (mntfh->size < sizeof(mntfh->data))
1919 memset(mntfh->data + mntfh->size, 0,
1920 sizeof(mntfh->data) - mntfh->size);
6e88e061 1921
2283f8d6
TT		 1922 /*
1923 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1924 * can deal with.
1925 */
ff3525a5 1926 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1927 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1928 args->rsize = data->rsize;
1929 args->wsize = data->wsize;
2283f8d6
TT		 1930 args->timeo = data->timeo;
1931 args->retrans = data->retrans;
1932 args->acregmin = data->acregmin;
1933 args->acregmax = data->acregmax;
1934 args->acdirmin = data->acdirmin;
1935 args->acdirmax = data->acdirmax;
b72e4f42 1936 args->need_mount = false;
4c568017 1937
4cfd74fc 1938 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1939 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 1940 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 1941 if (!nfs_verify_server_address(sap))
4c568017
CL		 1942 goto out_no_address;
1943
2283f8d6 1944 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1945 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1946 /* N.B. caller will free nfs_server.hostname in all cases */
1947 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1948 args->namlen = data->namlen;
1949 args->bsize = data->bsize;
dd07c947
CL		 1950
1951 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1952 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1953 if (!args->nfs_server.hostname)
1954 goto out_nomem;
f9c3a380 1955
5eebde23
SJ		 1956 if (!(data->flags & NFS_MOUNT_NONLM))
1957 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1958 NFS_MOUNT_LOCAL_FCNTL);
1959 else
1960 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1961 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1962 /*
1963 * The legacy version 6 binary mount data from userspace has a
1964 * field used only to transport selinux information into the
1965 * the kernel. To continue to support that functionality we
1966 * have a touch of selinux knowledge here in the NFS code. The
1967 * userspace code converted context=blah to just blah so we are
1968 * converting back to the full string selinux understands.
1969 */
1970 if (data->context[0]){
1971#ifdef CONFIG_SECURITY_SELINUX
1972 int rc;
1973 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1974 if (!opts_str)
1975 return -ENOMEM;
1976 strcpy(opts_str, "context=");
1977 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1978 strcat(opts_str, &data->context[0]);
1979 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1980 kfree(opts_str);
1981 if (rc)
1982 return rc;
1983#else
1984 return -EINVAL;
1985#endif
1986 }
1987
5df36e78 1988 break;
b72e4f42
BS		 1989 default:
1990 return NFS_TEXT_DATA;
f7b422b1 1991 }
54ceac45 1992
1c606fb7 1993#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 1994 if (args->version == 3)
5df36e78
CL		 1995 goto out_v3_not_compiled;
1996#endif /* !CONFIG_NFS_V3 */
f7b422b1 1997
5df36e78 1998 return 0;
f7b422b1 1999
5df36e78
CL		 2000out_no_data:
2001 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2002 return -EINVAL;
54ceac45 2003
5df36e78
CL		 2004out_no_v3:
2005 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2006 data->version);
2007 return -EINVAL;
f7b422b1 2008
5df36e78
CL		 2009out_no_sec:
2010 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2011 return -EINVAL;
2012
1c606fb7 2013#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 2014out_v3_not_compiled:
2015 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2016 return -EPROTONOSUPPORT;
2017#endif /* !CONFIG_NFS_V3 */
2018
63649bd7
CG		 2019out_nomem:
2020 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2021 return -ENOMEM;
2022
5df36e78
CL		 2023out_no_address:
2024 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2025 return -EINVAL;
2026
2027out_invalid_fh:
2028 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2029 return -EINVAL;
f7b422b1
DH		 2030}
2031
89d77c8f 2032#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 2033static int nfs_validate_mount_data(struct file_system_type *fs_type,
2034 void *options,
2035 struct nfs_parsed_mount_data *args,
2036 struct nfs_fh *mntfh,
2037 const char *dev_name)
2038{
2039 if (fs_type == &nfs_fs_type)
2040 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2041 return nfs4_validate_mount_data(options, args, dev_name);
2042}
2043#else
2044static int nfs_validate_mount_data(struct file_system_type *fs_type,
2045 void *options,
2046 struct nfs_parsed_mount_data *args,
2047 struct nfs_fh *mntfh,
2048 const char *dev_name)
2049{
2050 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2051}
2052#endif
2053
b72e4f42
BS		 2054static int nfs_validate_text_mount_data(void *options,
2055 struct nfs_parsed_mount_data *args,
2056 const char *dev_name)
2057{
2058 int port = 0;
2059 int max_namelen = PAGE_SIZE;
2060 int max_pathlen = NFS_MAXPATHLEN;
2061 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2062
2063 if (nfs_parse_mount_options((char *)options, args) == 0)
2064 return -EINVAL;
2065
2066 if (!nfs_verify_server_address(sap))
2067 goto out_no_address;
2068
2069 if (args->version == 4) {
89d77c8f 2070#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2071 port = NFS_PORT;
2072 max_namelen = NFS4_MAXNAMLEN;
2073 max_pathlen = NFS4_MAXPATHLEN;
2074 nfs_validate_transport_protocol(args);
2075 nfs4_validate_mount_flags(args);
2076#else
2077 goto out_v4_not_compiled;
2078#endif /* CONFIG_NFS_V4 */
2079 } else
2080 nfs_set_mount_transport_protocol(args);
2081
2082 nfs_set_port(sap, &args->nfs_server.port, port);
2083
2084 if (args->auth_flavor_len > 1)
2085 goto out_bad_auth;
2086
2087 return nfs_parse_devname(dev_name,
2088 &args->nfs_server.hostname,
2089 max_namelen,
2090 &args->nfs_server.export_path,
2091 max_pathlen);
2092
89d77c8f 2093#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2094out_v4_not_compiled:
2095 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2096 return -EPROTONOSUPPORT;
2097#endif /* !CONFIG_NFS_V4 */
2098
2099out_no_address:
2100 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2101 return -EINVAL;
2102
2103out_bad_auth:
2104 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2105 return -EINVAL;
2106}
2107
48b605f8
JL		 2108static int
2109nfs_compare_remount_data(struct nfs_server *nfss,
2110 struct nfs_parsed_mount_data *data)
2111{
2112 if (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 2123 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2124 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2125 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2126 return -EINVAL;
2127
2128 return 0;
2129}
2130
fbdefd64 2131int
48b605f8
JL		 2132nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2133{
2134 int error;
2135 struct nfs_server *nfss = sb->s_fs_info;
2136 struct nfs_parsed_mount_data *data;
2137 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2138 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2139 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2140
2141 /*
2142 * Userspace mount programs that send binary options generally send
2143 * them populated with default values. We have no way to know which
2144 * ones were explicitly specified. Fall back to legacy behavior and
2145 * just return success.
2146 */
31c94469
MZ		 2147 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2148 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2149 options->version <= 6))))
48b605f8
JL		 2150 return 0;
2151
2152 data = kzalloc(sizeof(*data), GFP_KERNEL);
2153 if (data == NULL)
2154 return -ENOMEM;
2155
2156 /* fill out struct with values from existing mount */
2157 data->flags = nfss->flags;
2158 data->rsize = nfss->rsize;
2159 data->wsize = nfss->wsize;
2160 data->retrans = nfss->client->cl_timeout->to_retries;
2161 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2162 data->acregmin = nfss->acregmin / HZ;
2163 data->acregmax = nfss->acregmax / HZ;
2164 data->acdirmin = nfss->acdirmin / HZ;
2165 data->acdirmax = nfss->acdirmax / HZ;
2166 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2167 data->nfs_server.port = nfss->port;
48b605f8
JL		 2168 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2169 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2170 data->nfs_server.addrlen);
2171
2172 /* overwrite those values with any that were specified */
2173 error = nfs_parse_mount_options((char *)options, data);
2174 if (error < 0)
2175 goto out;
2176
26c4c170
JL		 2177 /*
2178 * noac is a special case. It implies -o sync, but that's not
2179 * necessarily reflected in the mtab options. do_remount_sb
2180 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2181 * remount options, so we have to explicitly reset it.
2182 */
2183 if (data->flags & NFS_MOUNT_NOAC)
2184 *flags |= MS_SYNCHRONOUS;
2185
48b605f8
JL		 2186 /* compare new mount options with old ones */
2187 error = nfs_compare_remount_data(nfss, data);
2188out:
2189 kfree(data);
2190 return error;
2191}
89d77c8f 2192EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2193
f7b422b1 2194/*
54ceac45 2195 * Initialise the common bits of the superblock
f7b422b1 2196 */
fbdefd64 2197inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2198{
54ceac45 2199 struct nfs_server *server = NFS_SB(sb);
5006a76c 2200
54ceac45 2201 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2202
54ceac45
DH		 2203 /* We probably want something more informative here */
2204 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2205 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2206
54ceac45
DH		 2207 if (sb->s_blocksize == 0)
2208 sb->s_blocksize = nfs_block_bits(server->wsize,
2209 &sb->s_blocksize_bits);
f7b422b1 2210
32a88aa1
JA		 2211 sb->s_bdi = &server->backing_dev_info;
2212
54ceac45 2213 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2214}
2215
2216/*
54ceac45 2217 * Finish setting up an NFS2/3 superblock
f7b422b1 2218 */
fbdefd64 2219void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2220{
c40f8d1d 2221 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2222 struct nfs_server *server = NFS_SB(sb);
5006a76c 2223
54ceac45
DH		 2224 sb->s_blocksize_bits = 0;
2225 sb->s_blocksize = 0;
6a74490d
BS		 2226 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2227 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2228 if (data && data->bsize)
54ceac45 2229 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2230
6a74490d 2231 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2232 /* The VFS shouldn't apply the umask to mode bits. We will do
2233 * so ourselves when necessary.
2234 */
2235 sb->s_flags |= MS_POSIXACL;
2236 sb->s_time_gran = 1;
816724e6 2237 }
54ceac45 2238
54ceac45 2239 nfs_initialise_sb(sb);
f7b422b1 2240}
89d77c8f 2241EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2242
2243/*
3cadf4b8 2244 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2245 */
fbdefd64 2246void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2247{
8c958e0c 2248 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2249 struct nfs_server *server = NFS_SB(sb);
2250
2251 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2252 sb->s_blocksize = old_sb->s_blocksize;
2253 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2254 sb->s_xattr = old_sb->s_xattr;
2255 sb->s_op = old_sb->s_op;
2256 sb->s_time_gran = 1;
f7b422b1 2257
3cadf4b8 2258 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2259 /* The VFS shouldn't apply the umask to mode bits. We will do
2260 * so ourselves when necessary.
f7b422b1
DH		 2261 */
2262 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2263 }
2264
54ceac45 2265 nfs_initialise_sb(sb);
f7b422b1
DH		 2266}
2267
275a5d24
TM		 2268static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2269{
2270 const struct nfs_server *a = s->s_fs_info;
2271 const struct rpc_clnt *clnt_a = a->client;
2272 const struct rpc_clnt *clnt_b = b->client;
2273
2274 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2275 goto Ebusy;
2276 if (a->nfs_client != b->nfs_client)
2277 goto Ebusy;
2278 if (a->flags != b->flags)
2279 goto Ebusy;
2280 if (a->wsize != b->wsize)
2281 goto Ebusy;
2282 if (a->rsize != b->rsize)
2283 goto Ebusy;
2284 if (a->acregmin != b->acregmin)
2285 goto Ebusy;
2286 if (a->acregmax != b->acregmax)
2287 goto Ebusy;
2288 if (a->acdirmin != b->acdirmin)
2289 goto Ebusy;
2290 if (a->acdirmax != b->acdirmax)
2291 goto Ebusy;
2292 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2293 goto Ebusy;
e89a5a43 2294 return 1;
275a5d24 2295Ebusy:
e89a5a43
TM		 2296 return 0;
2297}
2298
2299struct nfs_sb_mountdata {
2300 struct nfs_server *server;
2301 int mntflags;
2302};
2303
2304static int nfs_set_super(struct super_block *s, void *data)
2305{
2306 struct nfs_sb_mountdata *sb_mntdata = data;
2307 struct nfs_server *server = sb_mntdata->server;
2308 int ret;
2309
2310 s->s_flags = sb_mntdata->mntflags;
2311 s->s_fs_info = server;
8b244ff2 2312 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2313 ret = set_anon_super(s, server);
2314 if (ret == 0)
2315 server->s_dev = s->s_dev;
2316 return ret;
2317}
2318
fd00a8ff
CL		 2319static int nfs_compare_super_address(struct nfs_server *server1,
2320 struct nfs_server *server2)
2321{
2322 struct sockaddr *sap1, *sap2;
2323
2324 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2325 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2326
2327 if (sap1->sa_family != sap2->sa_family)
2328 return 0;
2329
2330 switch (sap1->sa_family) {
2331 case AF_INET: {
2332 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2333 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2334 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2335 return 0;
2336 if (sin1->sin_port != sin2->sin_port)
2337 return 0;
2338 break;
2339 }
2340 case AF_INET6: {
2341 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2342 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2343 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2344 return 0;
2345 if (sin1->sin6_port != sin2->sin6_port)
2346 return 0;
2347 break;
2348 }
2349 default:
2350 return 0;
2351 }
2352
2353 return 1;
2354}
2355
e89a5a43
TM		 2356static int nfs_compare_super(struct super_block *sb, void *data)
2357{
2358 struct nfs_sb_mountdata *sb_mntdata = data;
2359 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2360 int mntflags = sb_mntdata->mntflags;
2361
fd00a8ff 2362 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2363 return 0;
2364 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2365 if (old->flags & NFS_MOUNT_UNSHARED)
2366 return 0;
2367 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2368 return 0;
2369 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2370}
2371
39ffb921 2372#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2373static void nfs_get_cache_cookie(struct super_block *sb,
2374 struct nfs_parsed_mount_data *parsed,
2375 struct nfs_clone_mount *cloned)
2376{
c4271c6e 2377 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2378 char *uniq = NULL;
2379 int ulen = 0;
2380
c4271c6e
TM		 2381 nfss->fscache_key = NULL;
2382 nfss->fscache = NULL;
2383
2384 if (parsed) {
2385 if (!(parsed->options & NFS_OPTION_FSCACHE))
2386 return;
2387 if (parsed->fscache_uniq) {
2388 uniq = parsed->fscache_uniq;
2389 ulen = strlen(parsed->fscache_uniq);
2390 }
2311b943
BS		 2391 } else if (cloned) {
2392 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2393 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2394 return;
2311b943
BS		 2395 if (mnt_s->fscache_key) {
2396 uniq = mnt_s->fscache_key->key.uniquifier;
2397 ulen = mnt_s->fscache_key->key.uniq_len;
2398 };
c4271c6e
TM		 2399 } else
2400 return;
2311b943
BS		 2401
2402 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2403}
39ffb921
TM		 2404#else
2405static void nfs_get_cache_cookie(struct super_block *sb,
2406 struct nfs_parsed_mount_data *parsed,
2407 struct nfs_clone_mount *cloned)
2408{
2409}
2410#endif
2311b943 2411
fa799759
MS		 2412static int nfs_bdi_register(struct nfs_server *server)
2413{
2414 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2415}
2416
fbdefd64
BS		 2417int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2418 struct nfs_mount_info *mount_info)
3d176e3f 2419{
aa9c2669
DQ		 2420 int error;
2421 unsigned long kflags = 0, kflags_out = 0;
2422 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2423 kflags |= SECURITY_LSM_NATIVE_LABELS;
2424
2425 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2426 kflags, &kflags_out);
2427 if (error)
2428 goto err;
2429
2430 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2431 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2432 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2433err:
2434 return error;
3d176e3f 2435}
89d77c8f 2436EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2437
fbdefd64
BS		 2438int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2439 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2440{
2441 /* clone any lsm security options from the parent to the new sb */
3d176e3f
BS		 2442 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2443 return -ESTALE;
094f7b69 2444 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
3d176e3f 2445}
89d77c8f 2446EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2447
ab7017a3 2448struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2449 int flags, const char *dev_name,
ab7017a3
BS		 2450 struct nfs_mount_info *mount_info,
2451 struct nfs_subversion *nfs_mod)
f7b422b1 2452{
f7b422b1 2453 struct super_block *s;
01194981 2454 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2455 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2456 struct nfs_sb_mountdata sb_mntdata = {
2457 .mntflags = flags,
c40f8d1d 2458 .server = server,
e89a5a43 2459 };
01194981 2460 int error;
33852a1f 2461
75180df2
TM		 2462 if (server->flags & NFS_MOUNT_UNSHARED)
2463 compare_super = NULL;
2464
fb2088cc
SP		 2465 /* -o noac implies -o sync */
2466 if (server->flags & NFS_MOUNT_NOAC)
2467 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2468
54ceac45 2469 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2470 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2471 if (IS_ERR(s)) {
01194981 2472 mntroot = ERR_CAST(s);
54ceac45 2473 goto out_err_nosb;
816724e6
TM		 2474 }
2475
54ceac45
DH		 2476 if (s->s_fs_info != server) {
2477 nfs_free_server(server);
2478 server = NULL;
fa799759
MS		 2479 } else {
2480 error = nfs_bdi_register(server);
01194981
AV		 2481 if (error) {
2482 mntroot = ERR_PTR(error);
cfbc0683 2483 goto error_splat_bdi;
01194981 2484 }
54ceac45 2485 }
f7b422b1 2486
54ceac45
DH		 2487 if (!s->s_root) {
2488 /* initial superblock/root creation */
c40f8d1d 2489 mount_info->fill_super(s, mount_info);
3d176e3f 2490 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2491 }
f7b422b1 2492
87c7083d 2493 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2494 if (IS_ERR(mntroot))
54ceac45 2495 goto error_splat_super;
816724e6 2496
3d176e3f 2497 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2498 if (error)
2499 goto error_splat_root;
2500
54ceac45 2501 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2502
2503out:
01194981 2504 return mntroot;
816724e6 2505
54ceac45
DH		 2506out_err_nosb:
2507 nfs_free_server(server);
0655960f 2508 goto out;
54ceac45 2509
f9c3a380
EP		 2510error_splat_root:
2511 dput(mntroot);
01194981 2512 mntroot = ERR_PTR(error);
54ceac45 2513error_splat_super:
cfbc0683
N		 2514 if (server && !s->s_root)
2515 bdi_unregister(&server->backing_dev_info);
2516error_splat_bdi:
6f5bbff9 2517 deactivate_locked_super(s);
0655960f 2518 goto out;
f7b422b1 2519}
89d77c8f 2520EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2521
fbdefd64 2522struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2523 int flags, const char *dev_name, void *raw_data)
2524{
c40f8d1d
BS		 2525 struct nfs_mount_info mount_info = {
2526 .fill_super = nfs_fill_super,
3d176e3f 2527 .set_security = nfs_set_sb_security,
c40f8d1d 2528 };
c40f8d1d 2529 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2530 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2531 int error;
2532
46058d46 2533 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2534 mount_info.mntfh = nfs_alloc_fhandle();
2535 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2536 goto out;
2537
2538 /* Validate the mount data */
87c7083d 2539 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2540 if (error == NFS_TEXT_DATA)
46058d46 2541 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2542 if (error < 0) {
2543 mntroot = ERR_PTR(error);
2544 goto out;
2545 }
c40f8d1d 2546
ab7017a3
BS		 2547 nfs_mod = get_nfs_version(mount_info.parsed->version);
2548 if (IS_ERR(nfs_mod)) {
2549 mntroot = ERR_CAST(nfs_mod);
2550 goto out;
2551 }
2552
ff9099f2 2553 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2554
2555 put_nfs_version(nfs_mod);
c40f8d1d 2556out:
46058d46 2557 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2558 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2559 return mntroot;
2560}
89d77c8f 2561EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2562
387c149b
TM		 2563/*
2564 * Ensure that we unregister the bdi before kill_anon_super
2565 * releases the device name
2566 */
fbdefd64 2567void nfs_put_super(struct super_block *s)
387c149b
TM		 2568{
2569 struct nfs_server *server = NFS_SB(s);
2570
2571 bdi_unregister(&server->backing_dev_info);
2572}
89d77c8f 2573EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2574
54ceac45
DH		 2575/*
2576 * Destroy an NFS2/3 superblock
2577 */
fbdefd64 2578void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2579{
2580 struct nfs_server *server = NFS_SB(s);
2581
2582 kill_anon_super(s);
08734048 2583 nfs_fscache_release_super_cookie(s);
54ceac45 2584 nfs_free_server(server);
f7b422b1 2585}
89d77c8f 2586EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2587
54ceac45 2588/*
8c958e0c 2589 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2590 */
3dd4f8ef 2591static struct dentry *
e8f25e6d
BS		 2592nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2593 const char *dev_name, void *raw_data)
f7b422b1 2594{
e8f25e6d
BS		 2595 struct nfs_clone_mount *data = raw_data;
2596 struct nfs_mount_info mount_info = {
2597 .fill_super = nfs_clone_super,
2598 .set_security = nfs_clone_sb_security,
2599 .cloned = data,
2600 };
54ceac45 2601 struct nfs_server *server;
3d176e3f 2602 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2603 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
f7b422b1 2604
dee972b9 2605 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2606
e8f25e6d 2607 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2608
54ceac45 2609 /* create a new volume representation */
1179acc6 2610 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
f7b422b1 2611
dee972b9
TM		 2612 if (IS_ERR(server))
2613 mntroot = ERR_CAST(server);
2614 else
2615 mntroot = nfs_fs_mount_common(server, flags,
2616 dev_name, &mount_info, nfs_mod);
24c8dbbb 2617
dee972b9
TM		 2618 dprintk("<-- nfs_xdev_mount() = %ld\n",
2619 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2620 return mntroot;
f7b422b1
DH		 2621}
2622
89d77c8f 2623#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2624
01c3f052
TM		 2625static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2626{
5eebde23
SJ		 2627 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2628 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2629}
2630
f0768ebd
CL		 2631/*
2632 * Validate NFSv4 mount options
2633 */
91ea40b9
TT		 2634static int nfs4_validate_mount_data(void *options,
2635 struct nfs_parsed_mount_data *args,
2636 const char *dev_name)
f0768ebd 2637{
4cfd74fc 2638 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2639 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2640 char *c;
2641
2642 if (data == NULL)
2643 goto out_no_data;
2644
cdf66442
BS		 2645 args->version = 4;
2646
f0768ebd
CL		 2647 switch (data->version) {
2648 case 1:
4c568017
CL		 2649 if (data->host_addrlen > sizeof(args->nfs_server.address))
2650 goto out_no_address;
2651 if (data->host_addrlen == 0)
f0768ebd 2652 goto out_no_address;
4c568017 2653 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2654 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2655 return -EFAULT;
4cfd74fc 2656 if (!nfs_verify_server_address(sap))
f0768ebd 2657 goto out_no_address;
872ece86 2658 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2659
6738b251
CL		 2660 if (data->auth_flavourlen) {
2661 if (data->auth_flavourlen > 1)
2662 goto out_inval_auth;
20c71f5e 2663 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2664 data->auth_flavours,
20c71f5e 2665 sizeof(args->auth_flavors[0])))
f0768ebd 2666 return -EFAULT;
f0768ebd
CL		 2667 }
2668
2669 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2670 if (IS_ERR(c))
2671 return PTR_ERR(c);
91ea40b9 2672 args->nfs_server.hostname = c;
f0768ebd
CL		 2673
2674 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2675 if (IS_ERR(c))
2676 return PTR_ERR(c);
91ea40b9
TT		 2677 args->nfs_server.export_path = c;
2678 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2679
2680 c = strndup_user(data->client_addr.data, 16);
2681 if (IS_ERR(c))
2682 return PTR_ERR(c);
91ea40b9
TT		 2683 args->client_address = c;
2684
2685 /*
2686 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2687 * can deal with.
2688 */
2689
2690 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2691 args->rsize = data->rsize;
2692 args->wsize = data->wsize;
2693 args->timeo = data->timeo;
2694 args->retrans = data->retrans;
2695 args->acregmin = data->acregmin;
2696 args->acregmax = data->acregmax;
2697 args->acdirmin = data->acdirmin;
2698 args->acdirmax = data->acdirmax;
2699 args->nfs_server.protocol = data->proto;
259875ef 2700 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2701
2702 break;
7630c852 2703 default:
b72e4f42 2704 return NFS_TEXT_DATA;
f0768ebd
CL		 2705 }
2706
2707 return 0;
2708
2709out_no_data:
2710 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2711 return -EINVAL;
2712
2713out_inval_auth:
2714 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2715 data->auth_flavourlen);
2716 return -EINVAL;
2717
2718out_no_address:
2719 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2720 return -EINVAL;
f0768ebd
CL		 2721}
2722
fac1e8e4
BS		 2723/*
2724 * NFS v4 module parameters need to stay in the
2725 * NFS client for backwards compatibility
2726 */
2727unsigned int nfs_callback_set_tcpport;
2728unsigned short nfs_callback_tcpport;
2729/* Default cache timeout is 10 minutes */
2730unsigned int nfs_idmap_cache_timeout = 600;
2731/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2732bool nfs4_disable_idmapping = true;
2733unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2734unsigned short send_implementation_id = 1;
6f2ea7f2 2735char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
fac1e8e4 2736
89d77c8f
BS		 2737EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2738EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2739EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2740EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2741EXPORT_SYMBOL_GPL(max_session_slots);
2742EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2743EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
89d77c8f 2744
fac1e8e4
BS		 2745#define NFS_CALLBACK_MAXPORTNR (65535U)
2746
2747static int param_set_portnr(const char *val, const struct kernel_param *kp)
2748{
2749 unsigned long num;
2750 int ret;
2751
2752 if (!val)
2753 return -EINVAL;
7297cb68 2754 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2755 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2756 return -EINVAL;
2757 *((unsigned int *)kp->arg) = num;
2758 return 0;
2759}
2760static struct kernel_param_ops param_ops_portnr = {
2761 .set = param_set_portnr,
2762 .get = param_get_uint,
2763};
2764#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2765
2766module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2767module_param(nfs_idmap_cache_timeout, int, 0644);
2768module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2769module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2770 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2771MODULE_PARM_DESC(nfs4_disable_idmapping,
2772 "Turn off NFSv4 idmapping when using 'sec=sys'");
2773module_param(max_session_slots, ushort, 0644);
2774MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2775 "requests the client will negotiate");
2776module_param(send_implementation_id, ushort, 0644);
2777MODULE_PARM_DESC(send_implementation_id,
2778 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2779MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2780
54ceac45 2781#endif /* CONFIG_NFS_V4 */
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