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NFSv4 Remove zeroing state kern warnings
[deliverable/linux.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 362static struct shrinker acl_shrinker = {
1ab6c499
DC		 363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
8e1f936b
RR		 365 .seeks = DEFAULT_SEEKS,
366};
979df72e 367
f7b422b1
DH		 368/*
369 * Register the NFS filesystems
370 */
371int __init register_nfs_fs(void)
372{
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
1ae811ee 379 ret = register_nfs4_fs();
f7b422b1
DH		 380 if (ret < 0)
381 goto error_1;
1ae811ee 382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
8e1f936b 386 register_shrinker(&acl_shrinker);
f7b422b1
DH		 387 return 0;
388
1ae811ee 389error_2:
390 unregister_nfs4_fs();
f7b422b1
DH		 391error_1:
392 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 393error_0:
394 return ret;
395}
396
397/*
398 * Unregister the NFS filesystems
399 */
400void __exit unregister_nfs_fs(void)
401{
8e1f936b 402 unregister_shrinker(&acl_shrinker);
49af7ee1 403 nfs_unregister_sysctl();
1ae811ee 404 unregister_nfs4_fs();
f7b422b1
DH		 405 unregister_filesystem(&nfs_fs_type);
406}
407
1daef0a8 408void nfs_sb_active(struct super_block *sb)
ef818a28 409{
1daef0a8 410 struct nfs_server *server = NFS_SB(sb);
ef818a28 411
1daef0a8
TM		 412 if (atomic_inc_return(&server->active) == 1)
413 atomic_inc(&sb->s_active);
ef818a28 414}
89d77c8f 415EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 416
1daef0a8 417void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 418{
419 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 420
421 if (atomic_dec_and_test(&server->active))
422 deactivate_super(sb);
ef818a28 423}
89d77c8f 424EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 425
f7b422b1
DH		 426/*
427 * Deliver file system statistics to userspace
428 */
fbdefd64 429int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 430{
0c7d90cf 431 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 432 unsigned char blockbits;
433 unsigned long blockres;
0c7d90cf 434 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 435 struct nfs_fsstat res;
436 int error = -ENOMEM;
437
438 res.fattr = nfs_alloc_fattr();
439 if (res.fattr == NULL)
440 goto out_err;
f7b422b1 441
8fa5c000 442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 443 if (unlikely(error == -ESTALE)) {
444 struct dentry *pd_dentry;
445
446 pd_dentry = dget_parent(dentry);
447 if (pd_dentry != NULL) {
448 nfs_zap_caches(pd_dentry->d_inode);
449 dput(pd_dentry);
450 }
451 }
ca7e9a0d 452 nfs_free_fattr(res.fattr);
f7b422b1
DH		 453 if (error < 0)
454 goto out_err;
ca7e9a0d 455
1a0ba9ae 456 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 457
458 /*
459 * Current versions of glibc do not correctly handle the
460 * case where f_frsize != f_bsize. Eventually we want to
461 * report the value of wtmult in this field.
462 */
0c7d90cf 463 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 464
465 /*
466 * On most *nix systems, f_blocks, f_bfree, and f_bavail
467 * are reported in units of f_frsize. Linux hasn't had
468 * an f_frsize field in its statfs struct until recently,
469 * thus historically Linux's sys_statfs reports these
470 * fields in units of f_bsize.
471 */
0c7d90cf
DH		 472 buf->f_bsize = dentry->d_sb->s_blocksize;
473 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 474 blockres = (1 << blockbits) - 1;
475 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
476 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
477 buf->f_bavail = (res.abytes + blockres) >> blockbits;
478
479 buf->f_files = res.tfiles;
480 buf->f_ffree = res.afiles;
481
482 buf->f_namelen = server->namelen;
1a0ba9ae 483
f7b422b1
DH		 484 return 0;
485
486 out_err:
3110ff80 487 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 488 return error;
f7b422b1 489}
89d77c8f 490EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 491
7d4e2747
DH		 492/*
493 * Map the security flavour number to a name
494 */
81039f1f
TM		 495static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
496{
7d4e2747 497 static const struct {
81039f1f
TM		 498 rpc_authflavor_t flavour;
499 const char *str;
500 } sec_flavours[] = {
501 { RPC_AUTH_NULL, "null" },
502 { RPC_AUTH_UNIX, "sys" },
503 { RPC_AUTH_GSS_KRB5, "krb5" },
504 { RPC_AUTH_GSS_KRB5I, "krb5i" },
505 { RPC_AUTH_GSS_KRB5P, "krb5p" },
506 { RPC_AUTH_GSS_LKEY, "lkey" },
507 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
508 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
509 { RPC_AUTH_GSS_SPKM, "spkm" },
510 { RPC_AUTH_GSS_SPKMI, "spkmi" },
511 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 512 { UINT_MAX, "unknown" }
81039f1f
TM		 513 };
514 int i;
515
4d81cd16 516 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 517 if (sec_flavours[i].flavour == flavour)
518 break;
519 }
520 return sec_flavours[i].str;
521}
522
ee671b01
JL		 523static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
524 int showdefaults)
525{
526 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
527
528 seq_printf(m, ",mountproto=");
529 switch (sap->sa_family) {
530 case AF_INET:
531 switch (nfss->mountd_protocol) {
532 case IPPROTO_UDP:
533 seq_printf(m, RPCBIND_NETID_UDP);
534 break;
535 case IPPROTO_TCP:
536 seq_printf(m, RPCBIND_NETID_TCP);
537 break;
538 default:
539 if (showdefaults)
540 seq_printf(m, "auto");
541 }
542 break;
543 case AF_INET6:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 seq_printf(m, RPCBIND_NETID_UDP6);
547 break;
548 case IPPROTO_TCP:
549 seq_printf(m, RPCBIND_NETID_TCP6);
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 break;
556 default:
557 if (showdefaults)
558 seq_printf(m, "auto");
559 }
560}
561
82d101d5
CL		 562static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
563 int showdefaults)
564{
565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
566
d5eff1a3
BS		 567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
568 return;
569
82d101d5
CL		 570 switch (sap->sa_family) {
571 case AF_INET: {
572 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 574 break;
575 }
576 case AF_INET6: {
577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 579 break;
580 }
581 default:
582 if (showdefaults)
583 seq_printf(m, ",mountaddr=unspecified");
584 }
585
586 if (nfss->mountd_version || showdefaults)
587 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 588 if ((nfss->mountd_port &&
589 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
590 showdefaults)
82d101d5
CL		 591 seq_printf(m, ",mountport=%u", nfss->mountd_port);
592
ee671b01 593 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 594}
595
89d77c8f 596#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 597static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
598 int showdefaults)
599{
600 struct nfs_client *clp = nfss->nfs_client;
601
602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 603}
604#else
605static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607{
608}
609#endif
610
7bbceb6f
TM		 611static void nfs_show_nfs_version(struct seq_file *m,
612 unsigned int version,
613 unsigned int minorversion)
614{
615 seq_printf(m, ",vers=%u", version);
616 if (version == 4)
617 seq_printf(m, ".%u", minorversion);
618}
619
f7b422b1
DH		 620/*
621 * Describe the mount options in force on this server representation
622 */
82d101d5
CL		 623static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624 int showdefaults)
f7b422b1 625{
509de811 626 static const struct proc_nfs_info {
f7b422b1 627 int flag;
509de811
DH		 628 const char *str;
629 const char *nostr;
f7b422b1
DH		 630 } nfs_info[] = {
631 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 632 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 633 { NFS_MOUNT_NOCTO, ",nocto", "" },
634 { NFS_MOUNT_NOAC, ",noac", "" },
635 { NFS_MOUNT_NONLM, ",nolock", "" },
636 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 637 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 638 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
639 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 640 { 0, NULL, NULL }
641 };
509de811 642 const struct proc_nfs_info *nfs_infop;
8fa5c000 643 struct nfs_client *clp = nfss->nfs_client;
82d101d5 644 u32 version = clp->rpc_ops->version;
7c563cc9 645 int local_flock, local_fcntl;
f7b422b1 646
7bbceb6f 647 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 648 seq_printf(m, ",rsize=%u", nfss->rsize);
649 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 650 if (nfss->bsize != 0)
651 seq_printf(m, ",bsize=%u", nfss->bsize);
652 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 653 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 654 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 655 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 656 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 657 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 658 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 659 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 660 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 661 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
662 if (nfss->flags & nfs_infop->flag)
663 seq_puts(m, nfs_infop->str);
664 else
665 seq_puts(m, nfs_infop->nostr);
666 }
2446ab60 667 rcu_read_lock();
56928edd 668 seq_printf(m, ",proto=%s",
ee671b01 669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 670 rcu_read_unlock();
82d101d5
CL		 671 if (version == 4) {
672 if (nfss->port != NFS_PORT)
673 seq_printf(m, ",port=%u", nfss->port);
674 } else
675 if (nfss->port)
676 seq_printf(m, ",port=%u", nfss->port);
677
33170233
TM		 678 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
679 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 680 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 681
682 if (version != 4)
683 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 684 else
685 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 686
b797cac7
DH		 687 if (nfss->options & NFS_OPTION_FSCACHE)
688 seq_printf(m, ",fsc");
9b00c643 689
89652617
CL		 690 if (nfss->options & NFS_OPTION_MIGRATION)
691 seq_printf(m, ",migration");
692
9b00c643
PL		 693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
7c563cc9
SJ		 699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 711}
712
713/*
714 * Describe the mount options on this VFS mountpoint
715 */
fbdefd64 716int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 717{
34c80b1d 718 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 719
720 nfs_show_mount_options(m, nfss, 0);
721
2446ab60 722 rcu_read_lock();
5d8515ca
CL		 723 seq_printf(m, ",addr=%s",
724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
725 RPC_DISPLAY_ADDR));
2446ab60 726 rcu_read_unlock();
f7b422b1
DH		 727
728 return 0;
729}
89d77c8f 730EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 731
89d77c8f 732#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 733#ifdef CONFIG_NFS_V4_1
45402c38 734static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 735{
736 if (nfs4_has_session(server->nfs_client))
737 seq_printf(m, ",sessions");
738}
739#else
45402c38
HS		 740static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
741#endif
ae50c0b5
BF		 742#endif
743
744#ifdef CONFIG_NFS_V4_1
45402c38 745static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 746{
747 seq_printf(m, ",pnfs=");
748 if (server->pnfs_curr_ld)
749 seq_printf(m, "%s", server->pnfs_curr_ld->name);
750 else
751 seq_printf(m, "not configured");
752}
7e03b7cc
TM		 753
754static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
755{
59155546
CL		 756 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
757 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 758 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
759 "date='%llu,%u'",
760 impl_id->name, impl_id->domain,
761 impl_id->date.seconds, impl_id->date.nseconds);
762 }
763}
45402c38 764#else
89d77c8f 765#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 766static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767{
768}
45402c38 769#endif
7e03b7cc
TM		 770static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
771{
772}
45402c38 773#endif
f7b422b1 774
fbdefd64 775int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 776{
777 char *page = (char *) __get_free_page(GFP_KERNEL);
778 char *devname, *dummy;
779 int err = 0;
780 if (!page)
781 return -ENOMEM;
97a54868 782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 783 if (IS_ERR(devname))
784 err = PTR_ERR(devname);
785 else
786 seq_escape(m, devname, " \t\n\\");
787 free_page((unsigned long)page);
788 return err;
789}
89d77c8f 790EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 791
fbdefd64 792int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 793{
794 seq_puts(m, "/");
795 return 0;
796}
89d77c8f 797EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 798
f7b422b1
DH		 799/*
800 * Present statistical information for this VFS mountpoint
801 */
fbdefd64 802int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 803{
804 int i, cpu;
64132379 805 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 806 struct rpc_auth *auth = nfss->client->cl_auth;
807 struct nfs_iostats totals = { };
808
809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
810
811 /*
812 * Display all mount option settings
813 */
814 seq_printf(m, "\n\topts:\t");
64132379
AV		 815 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
816 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 819 nfs_show_mount_options(m, nfss, 1);
820
821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
822
7e03b7cc 823 show_implementation_id(m, nfss);
7d2ed9ac 824
f7b422b1
DH		 825 seq_printf(m, "\n\tcaps:\t");
826 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 827 seq_printf(m, ",wtmult=%u", nfss->wtmult);
828 seq_printf(m, ",dtsize=%u", nfss->dtsize);
829 seq_printf(m, ",bsize=%u", nfss->bsize);
830 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 831
89d77c8f 832#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 833 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 834 seq_printf(m, "\n\tnfsv4:\t");
835 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
836 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
a09df2ca 837 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
f7b422b1 838 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 839 show_sessions(m, nfss);
840 show_pnfs(m, nfss);
f7b422b1
DH		 841 }
842#endif
843
844 /*
845 * Display security flavor in effect for this mount
846 */
2d767432 847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 848 if (auth->au_flavor)
2d767432 849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 850
851 /*
852 * Display superblock I/O counters
853 */
854 for_each_possible_cpu(cpu) {
855 struct nfs_iostats *stats;
856
857 preempt_disable();
858 stats = per_cpu_ptr(nfss->io_stats, cpu);
859
860 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
861 totals.events[i] += stats->events[i];
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 864#ifdef CONFIG_NFS_FSCACHE
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 totals.fscache[i] += stats->fscache[i];
867#endif
f7b422b1
DH		 868
869 preempt_enable();
870 }
871
872 seq_printf(m, "\n\tevents:\t");
873 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
874 seq_printf(m, "%lu ", totals.events[i]);
875 seq_printf(m, "\n\tbytes:\t");
876 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
877 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 878#ifdef CONFIG_NFS_FSCACHE
879 if (nfss->options & NFS_OPTION_FSCACHE) {
880 seq_printf(m, "\n\tfsc:\t");
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882 seq_printf(m, "%Lu ", totals.bytes[i]);
883 }
884#endif
f7b422b1
DH		 885 seq_printf(m, "\n");
886
887 rpc_print_iostats(m, nfss->client);
888
889 return 0;
890}
89d77c8f 891EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 892
893/*
894 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 895 * in response to xdev traversals and referrals
f7b422b1 896 */
fbdefd64 897void nfs_umount_begin(struct super_block *sb)
f7b422b1 898{
67e55205 899 struct nfs_server *server;
fc6ae3cf
TM		 900 struct rpc_clnt *rpc;
901
67e55205 902 server = NFS_SB(sb);
fc6ae3cf
TM		 903 /* -EIO all pending I/O */
904 rpc = server->client_acl;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
907 rpc = server->client;
908 if (!IS_ERR(rpc))
909 rpc_killall_tasks(rpc);
f7b422b1 910}
89d77c8f 911EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 912
db833351 913static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 914{
915 struct nfs_parsed_mount_data *data;
916
917 data = kzalloc(sizeof(*data), GFP_KERNEL);
918 if (data) {
9423a08a
CL		 919 data->acregmin = NFS_DEF_ACREGMIN;
920 data->acregmax = NFS_DEF_ACREGMAX;
921 data->acdirmin = NFS_DEF_ACDIRMIN;
922 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 923 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 924 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 925 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
4580a92d 926 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
74c98811 927 data->auth_flavor_len = 0;
9423a08a 928 data->minorversion = 0;
b72e4f42 929 data->need_mount = true;
9937347a 930 data->net = current->nsproxy->net_ns;
8a0d551a 931 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 932 }
933 return data;
934}
935
8a0d551a
JL		 936static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
937{
938 if (data) {
939 kfree(data->client_address);
940 kfree(data->mount_server.hostname);
941 kfree(data->nfs_server.export_path);
942 kfree(data->nfs_server.hostname);
943 kfree(data->fscache_uniq);
944 security_free_mnt_opts(&data->lsm_opts);
945 kfree(data);
946 }
947}
948
fc50d58f 949/*
cdcd7f9a
CL		 950 * Sanity-check a server address provided by the mount command.
951 *
952 * Address family must be initialized, and address must not be
953 * the ANY address for that family.
fc50d58f
CL		 954 */
955static int nfs_verify_server_address(struct sockaddr *addr)
956{
957 switch (addr->sa_family) {
958 case AF_INET: {
cdcd7f9a 959 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 960 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 961 }
962 case AF_INET6: {
963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
964 return !ipv6_addr_any(sa);
fc50d58f
CL		 965 }
966 }
967
53a0b9c4 968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 969 return 0;
970}
971
4cfd74fc
CL		 972/*
973 * Select between a default port value and a user-specified port value.
974 * If a zero value is set, then autobind will be used.
975 */
f5855fec 976static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 977 const unsigned short default_port)
978{
f5855fec
TM		 979 if (*port == NFS_UNSPEC_PORT)
980 *port = default_port;
4cfd74fc 981
f5855fec 982 rpc_set_port(sap, *port);
4cfd74fc
CL		 983}
984
259875ef
TM		 985/*
986 * Sanity check the NFS transport protocol.
987 *
988 */
989static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
990{
991 switch (mnt->nfs_server.protocol) {
992 case XPRT_TRANSPORT_UDP:
993 case XPRT_TRANSPORT_TCP:
994 case XPRT_TRANSPORT_RDMA:
995 break;
996 default:
997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
998 }
999}
1000
1001/*
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1004 */
1005static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006{
1007 nfs_validate_transport_protocol(mnt);
1008
1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011 return;
1012 switch (mnt->nfs_server.protocol) {
1013 case XPRT_TRANSPORT_UDP:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015 break;
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1019 }
1020}
1021
74c98811
TM		 1022static void nfs_set_auth_parsed_mount_data(struct nfs_parsed_mount_data *data,
1023 rpc_authflavor_t pseudoflavor)
1024{
1025 data->auth_flavors[0] = pseudoflavor;
1026 data->auth_flavor_len = 1;
1027}
1028
01060c89
CL		 1029/*
1030 * Parse the value of the 'sec=' option.
01060c89
CL		 1031 */
1032static int nfs_parse_security_flavors(char *value,
1033 struct nfs_parsed_mount_data *mnt)
1034{
1035 substring_t args[MAX_OPT_ARGS];
19e7b8d2 1036 rpc_authflavor_t pseudoflavor;
01060c89
CL		 1037
1038 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1039
1040 switch (match_token(value, nfs_secflavor_tokens, args)) {
1041 case Opt_sec_none:
19e7b8d2 1042 pseudoflavor = RPC_AUTH_NULL;
01060c89
CL		 1043 break;
1044 case Opt_sec_sys:
19e7b8d2 1045 pseudoflavor = RPC_AUTH_UNIX;
01060c89
CL		 1046 break;
1047 case Opt_sec_krb5:
19e7b8d2 1048 pseudoflavor = RPC_AUTH_GSS_KRB5;
01060c89
CL		 1049 break;
1050 case Opt_sec_krb5i:
19e7b8d2 1051 pseudoflavor = RPC_AUTH_GSS_KRB5I;
01060c89
CL		 1052 break;
1053 case Opt_sec_krb5p:
19e7b8d2 1054 pseudoflavor = RPC_AUTH_GSS_KRB5P;
01060c89
CL		 1055 break;
1056 case Opt_sec_lkey:
19e7b8d2 1057 pseudoflavor = RPC_AUTH_GSS_LKEY;
01060c89
CL		 1058 break;
1059 case Opt_sec_lkeyi:
19e7b8d2 1060 pseudoflavor = RPC_AUTH_GSS_LKEYI;
01060c89
CL		 1061 break;
1062 case Opt_sec_lkeyp:
19e7b8d2 1063 pseudoflavor = RPC_AUTH_GSS_LKEYP;
01060c89
CL		 1064 break;
1065 case Opt_sec_spkm:
19e7b8d2 1066 pseudoflavor = RPC_AUTH_GSS_SPKM;
01060c89
CL		 1067 break;
1068 case Opt_sec_spkmi:
19e7b8d2 1069 pseudoflavor = RPC_AUTH_GSS_SPKMI;
01060c89
CL		 1070 break;
1071 case Opt_sec_spkmp:
19e7b8d2 1072 pseudoflavor = RPC_AUTH_GSS_SPKMP;
01060c89
CL		 1073 break;
1074 default:
1075 return 0;
1076 }
1077
9b7160c5 1078 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
19e7b8d2 1079 nfs_set_auth_parsed_mount_data(mnt, pseudoflavor);
01060c89
CL		 1080 return 1;
1081}
1082
0d71b058
TM		 1083static int nfs_parse_version_string(char *string,
1084 struct nfs_parsed_mount_data *mnt,
1085 substring_t *args)
1086{
1087 mnt->flags &= ~NFS_MOUNT_VER3;
1088 switch (match_token(string, nfs_vers_tokens, args)) {
1089 case Opt_vers_2:
1090 mnt->version = 2;
1091 break;
1092 case Opt_vers_3:
1093 mnt->flags |= NFS_MOUNT_VER3;
1094 mnt->version = 3;
1095 break;
1096 case Opt_vers_4:
1097 /* Backward compatibility option. In future,
1098 * the mount program should always supply
1099 * a NFSv4 minor version number.
1100 */
1101 mnt->version = 4;
1102 break;
1103 case Opt_vers_4_0:
1104 mnt->version = 4;
1105 mnt->minorversion = 0;
1106 break;
1107 case Opt_vers_4_1:
1108 mnt->version = 4;
1109 mnt->minorversion = 1;
1110 break;
42c2c424
SD		 1111 case Opt_vers_4_2:
1112 mnt->version = 4;
1113 mnt->minorversion = 2;
1114 break;
0d71b058
TM		 1115 default:
1116 return 0;
1117 }
1118 return 1;
1119}
1120
c5cb09b6
RL		 1121static int nfs_get_option_str(substring_t args[], char **option)
1122{
1123 kfree(*option);
1124 *option = match_strdup(args);
e25fbe38 1125 return !*option;
c5cb09b6
RL		 1126}
1127
1128static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1129{
1130 int rc;
1131 char *string;
1132
1133 string = match_strdup(args);
1134 if (string == NULL)
1135 return -ENOMEM;
7297cb68 1136 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1137 kfree(string);
1138
1139 return rc;
1140}
1141
bf0fd768
CL		 1142/*
1143 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1144 * a data structure. The whole mount string is processed; bad options are
1145 * skipped as they are encountered. If there were no errors, return 1;
1146 * otherwise return 0 (zero).
bf0fd768
CL		 1147 */
1148static int nfs_parse_mount_options(char *raw,
1149 struct nfs_parsed_mount_data *mnt)
1150{
f9c3a380 1151 char *p, *string, *secdata;
d23c45fd 1152 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1153 unsigned short protofamily = AF_UNSPEC;
1154 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1155
1156 if (!raw) {
1157 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1158 return 1;
1159 }
1160 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1161
f9c3a380
EP		 1162 secdata = alloc_secdata();
1163 if (!secdata)
1164 goto out_nomem;
1165
1166 rc = security_sb_copy_data(raw, secdata);
1167 if (rc)
1168 goto out_security_failure;
1169
1170 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1171 if (rc)
1172 goto out_security_failure;
1173
1174 free_secdata(secdata);
1175
bf0fd768
CL		 1176 while ((p = strsep(&raw, ",")) != NULL) {
1177 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1178 unsigned long option;
1179 int token;
bf0fd768
CL		 1180
1181 if (!*p)
1182 continue;
1183
1184 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1185
1186 token = match_token(p, nfs_mount_option_tokens, args);
1187 switch (token) {
f45663ce
CL		 1188
1189 /*
1190 * boolean options: foo/nofoo
1191 */
bf0fd768
CL		 1192 case Opt_soft:
1193 mnt->flags |= NFS_MOUNT_SOFT;
1194 break;
1195 case Opt_hard:
1196 mnt->flags &= ~NFS_MOUNT_SOFT;
1197 break;
bf0fd768
CL		 1198 case Opt_posix:
1199 mnt->flags |= NFS_MOUNT_POSIX;
1200 break;
1201 case Opt_noposix:
1202 mnt->flags &= ~NFS_MOUNT_POSIX;
1203 break;
1204 case Opt_cto:
1205 mnt->flags &= ~NFS_MOUNT_NOCTO;
1206 break;
1207 case Opt_nocto:
1208 mnt->flags |= NFS_MOUNT_NOCTO;
1209 break;
1210 case Opt_ac:
1211 mnt->flags &= ~NFS_MOUNT_NOAC;
1212 break;
1213 case Opt_noac:
1214 mnt->flags |= NFS_MOUNT_NOAC;
1215 break;
1216 case Opt_lock:
1217 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1218 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1219 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1220 break;
1221 case Opt_nolock:
1222 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1223 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1224 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1225 break;
bf0fd768
CL		 1226 case Opt_udp:
1227 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1229 break;
1230 case Opt_tcp:
1231 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1232 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1233 break;
2cf7ff7a
TT		 1234 case Opt_rdma:
1235 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1236 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1237 xprt_load_transport(p);
2cf7ff7a 1238 break;
bf0fd768
CL		 1239 case Opt_acl:
1240 mnt->flags &= ~NFS_MOUNT_NOACL;
1241 break;
1242 case Opt_noacl:
1243 mnt->flags |= NFS_MOUNT_NOACL;
1244 break;
1245 case Opt_rdirplus:
1246 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1247 break;
1248 case Opt_nordirplus:
1249 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1250 break;
75180df2
TM		 1251 case Opt_sharecache:
1252 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1253 break;
1254 case Opt_nosharecache:
1255 mnt->flags |= NFS_MOUNT_UNSHARED;
1256 break;
d740351b
CL		 1257 case Opt_resvport:
1258 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1259 break;
1260 case Opt_noresvport:
1261 mnt->flags |= NFS_MOUNT_NORESVPORT;
1262 break;
b797cac7
DH		 1263 case Opt_fscache:
1264 mnt->options |= NFS_OPTION_FSCACHE;
1265 kfree(mnt->fscache_uniq);
1266 mnt->fscache_uniq = NULL;
1267 break;
1268 case Opt_nofscache:
1269 mnt->options &= ~NFS_OPTION_FSCACHE;
1270 kfree(mnt->fscache_uniq);
1271 mnt->fscache_uniq = NULL;
1272 break;
89652617
CL		 1273 case Opt_migration:
1274 mnt->options |= NFS_OPTION_MIGRATION;
1275 break;
1276 case Opt_nomigration:
1277 mnt->options &= NFS_OPTION_MIGRATION;
1278 break;
bf0fd768 1279
f45663ce
CL		 1280 /*
1281 * options that take numeric values
1282 */
bf0fd768 1283 case Opt_port:
c5cb09b6
RL		 1284 if (nfs_get_option_ul(args, &option) ||
1285 option > USHRT_MAX)
d23c45fd
CL		 1286 goto out_invalid_value;
1287 mnt->nfs_server.port = option;
bf0fd768
CL		 1288 break;
1289 case Opt_rsize:
c5cb09b6 1290 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1291 goto out_invalid_value;
1292 mnt->rsize = option;
bf0fd768
CL		 1293 break;
1294 case Opt_wsize:
c5cb09b6 1295 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1296 goto out_invalid_value;
1297 mnt->wsize = option;
bf0fd768
CL		 1298 break;
1299 case Opt_bsize:
c5cb09b6 1300 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1301 goto out_invalid_value;
1302 mnt->bsize = option;
bf0fd768
CL		 1303 break;
1304 case Opt_timeo:
c5cb09b6 1305 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1306 goto out_invalid_value;
1307 mnt->timeo = option;
bf0fd768
CL		 1308 break;
1309 case Opt_retrans:
c5cb09b6 1310 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1311 goto out_invalid_value;
1312 mnt->retrans = option;
bf0fd768
CL		 1313 break;
1314 case Opt_acregmin:
c5cb09b6 1315 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1316 goto out_invalid_value;
1317 mnt->acregmin = option;
bf0fd768
CL		 1318 break;
1319 case Opt_acregmax:
c5cb09b6 1320 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1321 goto out_invalid_value;
1322 mnt->acregmax = option;
bf0fd768
CL		 1323 break;
1324 case Opt_acdirmin:
c5cb09b6 1325 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1326 goto out_invalid_value;
1327 mnt->acdirmin = option;
bf0fd768
CL		 1328 break;
1329 case Opt_acdirmax:
c5cb09b6 1330 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1331 goto out_invalid_value;
1332 mnt->acdirmax = option;
bf0fd768
CL		 1333 break;
1334 case Opt_actimeo:
c5cb09b6 1335 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1336 goto out_invalid_value;
1337 mnt->acregmin = mnt->acregmax =
1338 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1339 break;
1340 case Opt_namelen:
c5cb09b6 1341 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1342 goto out_invalid_value;
1343 mnt->namlen = option;
bf0fd768
CL		 1344 break;
1345 case Opt_mountport:
c5cb09b6
RL		 1346 if (nfs_get_option_ul(args, &option) ||
1347 option > USHRT_MAX)
d23c45fd
CL		 1348 goto out_invalid_value;
1349 mnt->mount_server.port = option;
bf0fd768 1350 break;
bf0fd768 1351 case Opt_mountvers:
c5cb09b6 1352 if (nfs_get_option_ul(args, &option) ||
f45663ce 1353 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1354 option > NFS_MNT3_VERSION)
1355 goto out_invalid_value;
1356 mnt->mount_server.version = option;
bf0fd768 1357 break;
3fd5be9e 1358 case Opt_minorversion:
c5cb09b6 1359 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1360 goto out_invalid_value;
1361 if (option > NFS4_MAX_MINOR_VERSION)
1362 goto out_invalid_value;
1363 mnt->minorversion = option;
3fd5be9e 1364 break;
bf0fd768 1365
f45663ce
CL		 1366 /*
1367 * options that take text values
1368 */
0d71b058
TM		 1369 case Opt_nfsvers:
1370 string = match_strdup(args);
1371 if (string == NULL)
1372 goto out_nomem;
1373 rc = nfs_parse_version_string(string, mnt, args);
1374 kfree(string);
1375 if (!rc)
1376 goto out_invalid_value;
1377 break;
bf0fd768
CL		 1378 case Opt_sec:
1379 string = match_strdup(args);
1380 if (string == NULL)
1381 goto out_nomem;
01060c89 1382 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1383 kfree(string);
f45663ce 1384 if (!rc) {
f45663ce
CL		 1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "security flavor\n");
d23c45fd 1387 return 0;
f45663ce 1388 }
bf0fd768
CL		 1389 break;
1390 case Opt_proto:
1391 string = match_strdup(args);
1392 if (string == NULL)
1393 goto out_nomem;
1394 token = match_token(string,
1395 nfs_xprt_protocol_tokens, args);
bf0fd768 1396
ee671b01 1397 protofamily = AF_INET;
bf0fd768 1398 switch (token) {
ee671b01
JL		 1399 case Opt_xprt_udp6:
1400 protofamily = AF_INET6;
fdb66ff4 1401 case Opt_xprt_udp:
bf0fd768 1402 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1403 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1404 break;
ee671b01
JL		 1405 case Opt_xprt_tcp6:
1406 protofamily = AF_INET6;
fdb66ff4 1407 case Opt_xprt_tcp:
bf0fd768 1408 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1409 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1410 break;
2cf7ff7a
TT		 1411 case Opt_xprt_rdma:
1412 /* vector side protocols to TCP */
1413 mnt->flags |= NFS_MOUNT_TCP;
1414 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1415 xprt_load_transport(string);
2cf7ff7a 1416 break;
bf0fd768 1417 default:
f45663ce
CL		 1418 dfprintk(MOUNT, "NFS: unrecognized "
1419 "transport protocol\n");
4223a4a1 1420 kfree(string);
d23c45fd 1421 return 0;
bf0fd768 1422 }
c5cb09b6 1423 kfree(string);
bf0fd768
CL		 1424 break;
1425 case Opt_mountproto:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 token = match_token(string,
1430 nfs_xprt_protocol_tokens, args);
d508afb4 1431 kfree(string);
bf0fd768 1432
ee671b01 1433 mountfamily = AF_INET;
bf0fd768 1434 switch (token) {
ee671b01
JL		 1435 case Opt_xprt_udp6:
1436 mountfamily = AF_INET6;
fdb66ff4 1437 case Opt_xprt_udp:
0896a725 1438 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1439 break;
ee671b01
JL		 1440 case Opt_xprt_tcp6:
1441 mountfamily = AF_INET6;
fdb66ff4 1442 case Opt_xprt_tcp:
0896a725 1443 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1444 break;
2cf7ff7a 1445 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1446 default:
f45663ce
CL		 1447 dfprintk(MOUNT, "NFS: unrecognized "
1448 "transport protocol\n");
d23c45fd 1449 return 0;
bf0fd768
CL		 1450 }
1451 break;
1452 case Opt_addr:
1453 string = match_strdup(args);
1454 if (string == NULL)
1455 goto out_nomem;
53a0b9c4 1456 mnt->nfs_server.addrlen =
b48e1278 1457 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1458 (struct sockaddr *)
1459 &mnt->nfs_server.address,
1460 sizeof(mnt->nfs_server.address));
bf0fd768 1461 kfree(string);
53a0b9c4
CL		 1462 if (mnt->nfs_server.addrlen == 0)
1463 goto out_invalid_address;
bf0fd768
CL		 1464 break;
1465 case Opt_clientaddr:
c5cb09b6 1466 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1467 goto out_nomem;
bf0fd768 1468 break;
33832034 1469 case Opt_mounthost:
c5cb09b6
RL		 1470 if (nfs_get_option_str(args,
1471 &mnt->mount_server.hostname))
33832034 1472 goto out_nomem;
33832034 1473 break;
0ac83779 1474 case Opt_mountaddr:
bf0fd768
CL		 1475 string = match_strdup(args);
1476 if (string == NULL)
1477 goto out_nomem;
53a0b9c4 1478 mnt->mount_server.addrlen =
b48e1278 1479 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1480 (struct sockaddr *)
1481 &mnt->mount_server.address,
1482 sizeof(mnt->mount_server.address));
bf0fd768 1483 kfree(string);
53a0b9c4
CL		 1484 if (mnt->mount_server.addrlen == 0)
1485 goto out_invalid_address;
bf0fd768 1486 break;
7973c1f1
TM		 1487 case Opt_lookupcache:
1488 string = match_strdup(args);
1489 if (string == NULL)
1490 goto out_nomem;
1491 token = match_token(string,
1492 nfs_lookupcache_tokens, args);
1493 kfree(string);
1494 switch (token) {
1495 case Opt_lookupcache_all:
1496 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1497 break;
1498 case Opt_lookupcache_positive:
1499 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1500 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1501 break;
1502 case Opt_lookupcache_none:
1503 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1504 break;
1505 default:
7973c1f1
TM		 1506 dfprintk(MOUNT, "NFS: invalid "
1507 "lookupcache argument\n");
d23c45fd 1508 return 0;
7973c1f1
TM		 1509 };
1510 break;
a6d5ff64 1511 case Opt_fscache_uniq:
c5cb09b6 1512 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1513 goto out_nomem;
a6d5ff64
CL		 1514 mnt->options |= NFS_OPTION_FSCACHE;
1515 break;
5eebde23
SJ		 1516 case Opt_local_lock:
1517 string = match_strdup(args);
1518 if (string == NULL)
1519 goto out_nomem;
1520 token = match_token(string, nfs_local_lock_tokens,
1521 args);
1522 kfree(string);
1523 switch (token) {
1524 case Opt_local_lock_all:
1525 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1526 NFS_MOUNT_LOCAL_FCNTL);
1527 break;
1528 case Opt_local_lock_flock:
1529 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1530 break;
1531 case Opt_local_lock_posix:
1532 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1533 break;
1534 case Opt_local_lock_none:
1535 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1536 NFS_MOUNT_LOCAL_FCNTL);
1537 break;
1538 default:
1539 dfprintk(MOUNT, "NFS: invalid "
1540 "local_lock argument\n");
1541 return 0;
1542 };
1543 break;
bf0fd768 1544
f45663ce
CL		 1545 /*
1546 * Special options
1547 */
1548 case Opt_sloppy:
1549 sloppy = 1;
1550 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1551 break;
bf0fd768
CL		 1552 case Opt_userspace:
1553 case Opt_deprecated:
d33e4dfe
CL		 1554 dfprintk(MOUNT, "NFS: ignoring mount option "
1555 "'%s'\n", p);
bf0fd768
CL		 1556 break;
1557
1558 default:
d23c45fd 1559 invalid_option = 1;
f45663ce
CL		 1560 dfprintk(MOUNT, "NFS: unrecognized mount option "
1561 "'%s'\n", p);
bf0fd768
CL		 1562 }
1563 }
1564
d23c45fd
CL		 1565 if (!sloppy && invalid_option)
1566 return 0;
1567
571b7554
WAA		 1568 if (mnt->minorversion && mnt->version != 4)
1569 goto out_minorversion_mismatch;
1570
89652617
CL		 1571 if (mnt->options & NFS_OPTION_MIGRATION &&
1572 mnt->version != 4 && mnt->minorversion != 0)
1573 goto out_migration_misuse;
1574
ee671b01
JL		 1575 /*
1576 * verify that any proto=/mountproto= options match the address
1856b225 1577 * families in the addr=/mountaddr= options.
ee671b01
JL		 1578 */
1579 if (protofamily != AF_UNSPEC &&
1580 protofamily != mnt->nfs_server.address.ss_family)
1581 goto out_proto_mismatch;
1582
1583 if (mountfamily != AF_UNSPEC) {
1584 if (mnt->mount_server.addrlen) {
1585 if (mountfamily != mnt->mount_server.address.ss_family)
1586 goto out_mountproto_mismatch;
1587 } else {
1588 if (mountfamily != mnt->nfs_server.address.ss_family)
1589 goto out_mountproto_mismatch;
1590 }
1591 }
1592
bf0fd768
CL		 1593 return 1;
1594
ee671b01
JL		 1595out_mountproto_mismatch:
1596 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1597 "option\n");
1598 return 0;
1599out_proto_mismatch:
1600 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1601 return 0;
53a0b9c4
CL		 1602out_invalid_address:
1603 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1604 return 0;
d23c45fd 1605out_invalid_value:
53a0b9c4 1606 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1607 return 0;
571b7554
WAA		 1608out_minorversion_mismatch:
1609 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1610 "minorversion=%u\n", mnt->version, mnt->minorversion);
1611 return 0;
89652617
CL		 1612out_migration_misuse:
1613 printk(KERN_INFO
1614 "NFS: 'migration' not supported for this NFS version\n");
1615 return 0;
bf0fd768
CL		 1616out_nomem:
1617 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1618 return 0;
f9c3a380
EP		 1619out_security_failure:
1620 free_secdata(secdata);
1621 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1622 return 0;
bf0fd768
CL		 1623}
1624
ec88f28d 1625/*
9111c95b
JL		 1626 * Ensure that the specified authtype in args->auth_flavors[0] is supported by
1627 * the server. Returns 0 if it's ok, and -EACCES if not.
ec88f28d 1628 */
9111c95b
JL		 1629static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args,
1630 rpc_authflavor_t *server_authlist, unsigned int count)
ec88f28d 1631{
9111c95b 1632 unsigned int i;
4580a92d 1633
d497ab97
WAA		 1634 /*
1635 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1636 * must be in the list returned by the server.
1637 *
1638 * AUTH_NULL has a special meaning when it's in the server list - it
1639 * means that the server will ignore the rpc creds, so any flavor
1640 * can be used.
1641 */
4580a92d 1642 for (i = 0; i < count; i++) {
9111c95b
JL		 1643 if (args->auth_flavors[0] == server_authlist[i] ||
1644 server_authlist[i] == RPC_AUTH_NULL)
1645 goto out;
4580a92d 1646 }
ec88f28d 1647
9111c95b
JL		 1648 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n",
1649 args->auth_flavors[0]);
1650 return -EACCES;
d497ab97 1651
4580a92d 1652out:
9111c95b 1653 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
d497ab97 1654 return 0;
ec88f28d
CL		 1655}
1656
0076d7b7
CL		 1657/*
1658 * Use the remote server's MOUNT service to request the NFS file handle
1659 * corresponding to the provided path.
1660 */
486aa699 1661static int nfs_request_mount(struct nfs_parsed_mount_data *args,
294ae81d
JL		 1662 struct nfs_fh *root_fh,
1663 rpc_authflavor_t *server_authlist,
1664 unsigned int *server_authlist_len)
0076d7b7 1665{
c5d120f8
CL		 1666 struct nfs_mount_request request = {
1667 .sap = (struct sockaddr *)
1668 &args->mount_server.address,
1669 .dirpath = args->nfs_server.export_path,
1670 .protocol = args->mount_server.protocol,
1671 .fh = root_fh,
50a737f8 1672 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
294ae81d 1673 .auth_flav_len = server_authlist_len,
ec88f28d 1674 .auth_flavs = server_authlist,
6d59b8d5 1675 .net = args->net,
c5d120f8 1676 };
4c568017 1677 int status;
0076d7b7
CL		 1678
1679 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1680 switch (args->version) {
1681 default:
1682 args->mount_server.version = NFS_MNT3_VERSION;
1683 break;
1684 case 2:
1685 args->mount_server.version = NFS_MNT_VERSION;
1686 }
0076d7b7 1687 }
c5d120f8 1688 request.version = args->mount_server.version;
0076d7b7 1689
33832034 1690 if (args->mount_server.hostname)
c5d120f8 1691 request.hostname = args->mount_server.hostname;
33832034 1692 else
c5d120f8 1693 request.hostname = args->nfs_server.hostname;
33832034 1694
0076d7b7
CL		 1695 /*
1696 * Construct the mount server's address.
1697 */
4c568017 1698 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1699 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1700 args->nfs_server.addrlen);
1701 args->mount_server.addrlen = args->nfs_server.addrlen;
1702 }
c5d120f8 1703 request.salen = args->mount_server.addrlen;
f5855fec 1704 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1705
1706 /*
1707 * Now ask the mount server to map our export path
1708 * to a file handle.
1709 */
c5d120f8 1710 status = nfs_mount(&request);
ec88f28d
CL		 1711 if (status != 0) {
1712 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1713 request.hostname, status);
1714 return status;
1715 }
0076d7b7 1716
9111c95b 1717 return 0;
0076d7b7
CL		 1718}
1719
d17540c6
JL		 1720static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1721 struct nfs_subversion *nfs_mod)
1722{
1723 int status;
9111c95b
JL		 1724 unsigned int i;
1725 bool tried_auth_unix = false;
1726 bool auth_null_in_list = false;
1727 struct nfs_server *server = ERR_PTR(-EACCES);
294ae81d
JL		 1728 struct nfs_parsed_mount_data *args = mount_info->parsed;
1729 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1730 unsigned int authlist_len = ARRAY_SIZE(authlist);
d17540c6 1731
294ae81d
JL		 1732 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1733 &authlist_len);
d17540c6
JL		 1734 if (status)
1735 return ERR_PTR(status);
1736
9111c95b
JL		 1737 /*
1738 * Was a sec= authflavor specified in the options? First, verify
1739 * whether the server supports it, and then just try to use it if so.
1740 */
74c98811 1741 if (args->auth_flavor_len > 0) {
9111c95b
JL		 1742 status = nfs_verify_authflavor(args, authlist, authlist_len);
1743 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1744 if (status)
1745 return ERR_PTR(status);
1746 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1747 }
1748
1749 /*
1750 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1751 * SHOULD prefer the flavor listed first. However, some servers list
1752 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1753 */
1754 for (i = 0; i < authlist_len; ++i) {
1755 rpc_authflavor_t flavor;
1756 struct rpcsec_gss_info info;
1757
1758 flavor = authlist[i];
1759 switch (flavor) {
1760 case RPC_AUTH_UNIX:
1761 tried_auth_unix = true;
1762 break;
1763 case RPC_AUTH_NULL:
1764 auth_null_in_list = true;
1765 continue;
1766 default:
1767 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1768 continue;
1769 /* Fallthrough */
1770 }
1771 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
74c98811 1772 nfs_set_auth_parsed_mount_data(args, flavor);
9111c95b
JL		 1773 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1774 if (!IS_ERR(server))
1775 return server;
1776 }
1777
1778 /*
1779 * Nothing we tried so far worked. At this point, give up if we've
1780 * already tried AUTH_UNIX or if the server's list doesn't contain
1781 * AUTH_NULL
1782 */
1783 if (tried_auth_unix || !auth_null_in_list)
1784 return server;
1785
1786 /* Last chance! Try AUTH_UNIX */
1787 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
74c98811 1788 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
d17540c6
JL		 1789 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1790}
1791
ff9099f2
BS		 1792struct dentry *nfs_try_mount(int flags, const char *dev_name,
1793 struct nfs_mount_info *mount_info,
1794 struct nfs_subversion *nfs_mod)
486aa699 1795{
486aa699
BS		 1796 struct nfs_server *server;
1797
d17540c6
JL		 1798 if (mount_info->parsed->need_mount)
1799 server = nfs_try_mount_request(mount_info, nfs_mod);
1800 else
1801 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699 1802
486aa699
BS		 1803 if (IS_ERR(server))
1804 return ERR_CAST(server);
1805
ab7017a3 1806 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1807}
ddda8e0a 1808EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1809
c12bacec
RL		 1810/*
1811 * Split "dev_name" into "hostname:export_path".
1812 *
1813 * The leftmost colon demarks the split between the server's hostname
1814 * and the export path. If the hostname starts with a left square
1815 * bracket, then it may contain colons.
1816 *
1817 * Note: caller frees hostname and export path, even on error.
1818 */
1819static int nfs_parse_devname(const char *dev_name,
1820 char **hostname, size_t maxnamlen,
1821 char **export_path, size_t maxpathlen)
dc045898
CL		 1822{
1823 size_t len;
c12bacec 1824 char *end;
dc045898 1825
c12bacec
RL		 1826 /* Is the host name protected with square brakcets? */
1827 if (*dev_name == '[') {
1828 end = strchr(++dev_name, ']');
1829 if (end == NULL || end[1] != ':')
dc045898 1830 goto out_bad_devname;
dc045898 1831
c12bacec
RL		 1832 len = end - dev_name;
1833 end++;
1834 } else {
1835 char *comma;
dc045898 1836
c12bacec
RL		 1837 end = strchr(dev_name, ':');
1838 if (end == NULL)
1839 goto out_bad_devname;
1840 len = end - dev_name;
d1aa0825 1841
c12bacec
RL		 1842 /* kill possible hostname list: not supported */
1843 comma = strchr(dev_name, ',');
1844 if (comma != NULL && comma < end)
1845 *comma = 0;
1846 }
d1aa0825 1847
d1aa0825
CL		 1848 if (len > maxnamlen)
1849 goto out_hostname;
1850
1851 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1852 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1853 if (*hostname == NULL)
1854 goto out_nomem;
c12bacec 1855 len = strlen(++end);
d1aa0825
CL		 1856 if (len > maxpathlen)
1857 goto out_path;
1858 *export_path = kstrndup(end, len, GFP_KERNEL);
1859 if (!*export_path)
1860 goto out_nomem;
1861
c12bacec 1862 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1863 return 0;
1864
1865out_bad_devname:
1866 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1867 return -EINVAL;
1868
1869out_nomem:
1870 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1871 return -ENOMEM;
1872
1873out_hostname:
1874 dfprintk(MOUNT, "NFS: server hostname too long\n");
1875 return -ENAMETOOLONG;
1876
1877out_path:
1878 dfprintk(MOUNT, "NFS: export pathname too long\n");
1879 return -ENAMETOOLONG;
1880}
1881
f7b422b1 1882/*
54ceac45
DH		 1883 * Validate the NFS2/NFS3 mount data
1884 * - fills in the mount root filehandle
136d558c
CL		 1885 *
1886 * For option strings, user space handles the following behaviors:
1887 *
1888 * + DNS: mapping server host name to IP address ("addr=" option)
1889 *
1890 * + failure mode: how to behave if a mount request can't be handled
1891 * immediately ("fg/bg" option)
1892 *
1893 * + retry: how often to retry a mount request ("retry=" option)
1894 *
1895 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1896 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1897 */
d72c727c
BS		 1898static int nfs23_validate_mount_data(void *options,
1899 struct nfs_parsed_mount_data *args,
1900 struct nfs_fh *mntfh,
1901 const char *dev_name)
f7b422b1 1902{
2283f8d6 1903 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1904 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
74c98811 1905 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
136d558c 1906
5df36e78
CL		 1907 if (data == NULL)
1908 goto out_no_data;
f7b422b1 1909
c5afc8da 1910 args->version = NFS_DEFAULT_VERSION;
54ceac45 1911 switch (data->version) {
5df36e78
CL		 1912 case 1:
1913 data->namlen = 0;
1914 case 2:
1915 data->bsize = 0;
1916 case 3:
1917 if (data->flags & NFS_MOUNT_VER3)
1918 goto out_no_v3;
1919 data->root.size = NFS2_FHSIZE;
1920 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
74c98811
TM		 1921 /* Turn off security negotiation */
1922 extra_flags |= NFS_MOUNT_SECFLAVOUR;
5df36e78
CL		 1923 case 4:
1924 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1925 goto out_no_sec;
1926 case 5:
1927 memset(data->context, 0, sizeof(data->context));
1928 case 6:
b7e24457
TM		 1929 if (data->flags & NFS_MOUNT_VER3) {
1930 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1931 goto out_invalid_fh;
5df36e78 1932 mntfh->size = data->root.size;
764302cc
CL		 1933 args->version = 3;
1934 } else {
5df36e78 1935 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1936 args->version = 2;
1937 }
5df36e78 1938
5df36e78
CL		 1939
1940 memcpy(mntfh->data, data->root.data, mntfh->size);
1941 if (mntfh->size < sizeof(mntfh->data))
1942 memset(mntfh->data + mntfh->size, 0,
1943 sizeof(mntfh->data) - mntfh->size);
6e88e061 1944
2283f8d6
TT		 1945 /*
1946 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1947 * can deal with.
1948 */
ff3525a5 1949 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
74c98811 1950 args->flags |= extra_flags;
2283f8d6
TT		 1951 args->rsize = data->rsize;
1952 args->wsize = data->wsize;
2283f8d6
TT		 1953 args->timeo = data->timeo;
1954 args->retrans = data->retrans;
1955 args->acregmin = data->acregmin;
1956 args->acregmax = data->acregmax;
1957 args->acdirmin = data->acdirmin;
1958 args->acdirmax = data->acdirmax;
b72e4f42 1959 args->need_mount = false;
4c568017 1960
4cfd74fc 1961 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1962 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 1963 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 1964 if (!nfs_verify_server_address(sap))
4c568017
CL		 1965 goto out_no_address;
1966
2283f8d6 1967 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1968 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1969 /* N.B. caller will free nfs_server.hostname in all cases */
1970 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1971 args->namlen = data->namlen;
1972 args->bsize = data->bsize;
dd07c947
CL		 1973
1974 if (data->flags & NFS_MOUNT_SECFLAVOUR)
74c98811
TM		 1975 nfs_set_auth_parsed_mount_data(args, data->pseudoflavor);
1976 else
1977 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
63649bd7
CG		 1978 if (!args->nfs_server.hostname)
1979 goto out_nomem;
f9c3a380 1980
5eebde23
SJ		 1981 if (!(data->flags & NFS_MOUNT_NONLM))
1982 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1983 NFS_MOUNT_LOCAL_FCNTL);
1984 else
1985 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1986 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1987 /*
1988 * The legacy version 6 binary mount data from userspace has a
1989 * field used only to transport selinux information into the
1990 * the kernel. To continue to support that functionality we
1991 * have a touch of selinux knowledge here in the NFS code. The
1992 * userspace code converted context=blah to just blah so we are
1993 * converting back to the full string selinux understands.
1994 */
1995 if (data->context[0]){
1996#ifdef CONFIG_SECURITY_SELINUX
1997 int rc;
1998 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1999 if (!opts_str)
2000 return -ENOMEM;
2001 strcpy(opts_str, "context=");
2002 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2003 strcat(opts_str, &data->context[0]);
2004 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2005 kfree(opts_str);
2006 if (rc)
2007 return rc;
2008#else
2009 return -EINVAL;
2010#endif
2011 }
2012
5df36e78 2013 break;
b72e4f42
BS		 2014 default:
2015 return NFS_TEXT_DATA;
f7b422b1 2016 }
54ceac45 2017
1c606fb7 2018#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 2019 if (args->version == 3)
5df36e78
CL		 2020 goto out_v3_not_compiled;
2021#endif /* !CONFIG_NFS_V3 */
f7b422b1 2022
5df36e78 2023 return 0;
f7b422b1 2024
5df36e78
CL		 2025out_no_data:
2026 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2027 return -EINVAL;
54ceac45 2028
5df36e78
CL		 2029out_no_v3:
2030 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2031 data->version);
2032 return -EINVAL;
f7b422b1 2033
5df36e78
CL		 2034out_no_sec:
2035 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2036 return -EINVAL;
2037
1c606fb7 2038#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 2039out_v3_not_compiled:
2040 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2041 return -EPROTONOSUPPORT;
2042#endif /* !CONFIG_NFS_V3 */
2043
63649bd7
CG		 2044out_nomem:
2045 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2046 return -ENOMEM;
2047
5df36e78
CL		 2048out_no_address:
2049 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2050 return -EINVAL;
2051
2052out_invalid_fh:
2053 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2054 return -EINVAL;
f7b422b1
DH		 2055}
2056
89d77c8f 2057#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 2058static int nfs_validate_mount_data(struct file_system_type *fs_type,
2059 void *options,
2060 struct nfs_parsed_mount_data *args,
2061 struct nfs_fh *mntfh,
2062 const char *dev_name)
2063{
2064 if (fs_type == &nfs_fs_type)
2065 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2066 return nfs4_validate_mount_data(options, args, dev_name);
2067}
2068#else
2069static int nfs_validate_mount_data(struct file_system_type *fs_type,
2070 void *options,
2071 struct nfs_parsed_mount_data *args,
2072 struct nfs_fh *mntfh,
2073 const char *dev_name)
2074{
2075 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2076}
2077#endif
2078
b72e4f42
BS		 2079static int nfs_validate_text_mount_data(void *options,
2080 struct nfs_parsed_mount_data *args,
2081 const char *dev_name)
2082{
2083 int port = 0;
2084 int max_namelen = PAGE_SIZE;
2085 int max_pathlen = NFS_MAXPATHLEN;
2086 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2087
2088 if (nfs_parse_mount_options((char *)options, args) == 0)
2089 return -EINVAL;
2090
2091 if (!nfs_verify_server_address(sap))
2092 goto out_no_address;
2093
2094 if (args->version == 4) {
89d77c8f 2095#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2096 port = NFS_PORT;
2097 max_namelen = NFS4_MAXNAMLEN;
2098 max_pathlen = NFS4_MAXPATHLEN;
2099 nfs_validate_transport_protocol(args);
6da1a034
TM		 2100 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2101 goto out_invalid_transport_udp;
b72e4f42
BS		 2102 nfs4_validate_mount_flags(args);
2103#else
2104 goto out_v4_not_compiled;
2105#endif /* CONFIG_NFS_V4 */
2106 } else
2107 nfs_set_mount_transport_protocol(args);
2108
2109 nfs_set_port(sap, &args->nfs_server.port, port);
2110
2111 if (args->auth_flavor_len > 1)
2112 goto out_bad_auth;
2113
2114 return nfs_parse_devname(dev_name,
2115 &args->nfs_server.hostname,
2116 max_namelen,
2117 &args->nfs_server.export_path,
2118 max_pathlen);
2119
89d77c8f 2120#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2121out_v4_not_compiled:
2122 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2123 return -EPROTONOSUPPORT;
6da1a034
TM		 2124#else
2125out_invalid_transport_udp:
2126 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2127 return -EINVAL;
b72e4f42
BS		 2128#endif /* !CONFIG_NFS_V4 */
2129
2130out_no_address:
2131 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2132 return -EINVAL;
2133
2134out_bad_auth:
2135 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2136 return -EINVAL;
2137}
2138
48b605f8
JL		 2139static int
2140nfs_compare_remount_data(struct nfs_server *nfss,
2141 struct nfs_parsed_mount_data *data)
2142{
2143 if (data->flags != nfss->flags ||
2144 data->rsize != nfss->rsize ||
2145 data->wsize != nfss->wsize ||
2146 data->retrans != nfss->client->cl_timeout->to_retries ||
2147 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2148 data->acregmin != nfss->acregmin / HZ ||
2149 data->acregmax != nfss->acregmax / HZ ||
2150 data->acdirmin != nfss->acdirmin / HZ ||
2151 data->acdirmax != nfss->acdirmax / HZ ||
2152 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2153 data->nfs_server.port != nfss->port ||
48b605f8 2154 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2155 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2156 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2157 return -EINVAL;
2158
2159 return 0;
2160}
2161
fbdefd64 2162int
48b605f8
JL		 2163nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2164{
2165 int error;
2166 struct nfs_server *nfss = sb->s_fs_info;
2167 struct nfs_parsed_mount_data *data;
2168 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2169 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2170 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2171
2172 /*
2173 * Userspace mount programs that send binary options generally send
2174 * them populated with default values. We have no way to know which
2175 * ones were explicitly specified. Fall back to legacy behavior and
2176 * just return success.
2177 */
31c94469
MZ		 2178 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2179 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2180 options->version <= 6))))
48b605f8
JL		 2181 return 0;
2182
2183 data = kzalloc(sizeof(*data), GFP_KERNEL);
2184 if (data == NULL)
2185 return -ENOMEM;
2186
2187 /* fill out struct with values from existing mount */
2188 data->flags = nfss->flags;
2189 data->rsize = nfss->rsize;
2190 data->wsize = nfss->wsize;
2191 data->retrans = nfss->client->cl_timeout->to_retries;
74c98811 2192 nfs_set_auth_parsed_mount_data(data, nfss->client->cl_auth->au_flavor);
48b605f8
JL		 2193 data->acregmin = nfss->acregmin / HZ;
2194 data->acregmax = nfss->acregmax / HZ;
2195 data->acdirmin = nfss->acdirmin / HZ;
2196 data->acdirmax = nfss->acdirmax / HZ;
2197 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2198 data->nfs_server.port = nfss->port;
48b605f8
JL		 2199 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2200 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2201 data->nfs_server.addrlen);
2202
2203 /* overwrite those values with any that were specified */
2204 error = nfs_parse_mount_options((char *)options, data);
2205 if (error < 0)
2206 goto out;
2207
26c4c170
JL		 2208 /*
2209 * noac is a special case. It implies -o sync, but that's not
2210 * necessarily reflected in the mtab options. do_remount_sb
2211 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2212 * remount options, so we have to explicitly reset it.
2213 */
2214 if (data->flags & NFS_MOUNT_NOAC)
2215 *flags |= MS_SYNCHRONOUS;
2216
48b605f8
JL		 2217 /* compare new mount options with old ones */
2218 error = nfs_compare_remount_data(nfss, data);
2219out:
2220 kfree(data);
2221 return error;
2222}
89d77c8f 2223EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2224
f7b422b1 2225/*
54ceac45 2226 * Initialise the common bits of the superblock
f7b422b1 2227 */
fbdefd64 2228inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2229{
54ceac45 2230 struct nfs_server *server = NFS_SB(sb);
5006a76c 2231
54ceac45 2232 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2233
54ceac45
DH		 2234 /* We probably want something more informative here */
2235 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2236 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2237
54ceac45
DH		 2238 if (sb->s_blocksize == 0)
2239 sb->s_blocksize = nfs_block_bits(server->wsize,
2240 &sb->s_blocksize_bits);
f7b422b1 2241
32a88aa1
JA		 2242 sb->s_bdi = &server->backing_dev_info;
2243
54ceac45 2244 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2245}
2246
2247/*
54ceac45 2248 * Finish setting up an NFS2/3 superblock
f7b422b1 2249 */
fbdefd64 2250void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2251{
c40f8d1d 2252 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2253 struct nfs_server *server = NFS_SB(sb);
5006a76c 2254
54ceac45
DH		 2255 sb->s_blocksize_bits = 0;
2256 sb->s_blocksize = 0;
6a74490d
BS		 2257 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2258 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2259 if (data && data->bsize)
54ceac45 2260 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2261
6a74490d 2262 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2263 /* The VFS shouldn't apply the umask to mode bits. We will do
2264 * so ourselves when necessary.
2265 */
2266 sb->s_flags |= MS_POSIXACL;
2267 sb->s_time_gran = 1;
816724e6 2268 }
54ceac45 2269
54ceac45 2270 nfs_initialise_sb(sb);
f7b422b1 2271}
89d77c8f 2272EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2273
2274/*
3cadf4b8 2275 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2276 */
fbdefd64 2277void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2278{
8c958e0c 2279 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2280 struct nfs_server *server = NFS_SB(sb);
2281
2282 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2283 sb->s_blocksize = old_sb->s_blocksize;
2284 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2285 sb->s_xattr = old_sb->s_xattr;
2286 sb->s_op = old_sb->s_op;
2287 sb->s_time_gran = 1;
f7b422b1 2288
3cadf4b8 2289 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2290 /* The VFS shouldn't apply the umask to mode bits. We will do
2291 * so ourselves when necessary.
f7b422b1
DH		 2292 */
2293 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2294 }
2295
54ceac45 2296 nfs_initialise_sb(sb);
f7b422b1
DH		 2297}
2298
0aea92bf
TM		 2299#define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2300 | NFS_MOUNT_SECURE \
2301 | NFS_MOUNT_TCP \
2302 | NFS_MOUNT_VER3 \
2303 | NFS_MOUNT_KERBEROS \
2304 | NFS_MOUNT_NONLM \
2305 | NFS_MOUNT_BROKEN_SUID \
2306 | NFS_MOUNT_STRICTLOCK \
2307 | NFS_MOUNT_UNSHARED \
2308 | NFS_MOUNT_NORESVPORT \
2309 | NFS_MOUNT_LEGACY_INTERFACE)
2310
275a5d24
TM		 2311static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2312{
2313 const struct nfs_server *a = s->s_fs_info;
2314 const struct rpc_clnt *clnt_a = a->client;
2315 const struct rpc_clnt *clnt_b = b->client;
2316
2317 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2318 goto Ebusy;
2319 if (a->nfs_client != b->nfs_client)
2320 goto Ebusy;
0aea92bf 2321 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
275a5d24
TM		 2322 goto Ebusy;
2323 if (a->wsize != b->wsize)
2324 goto Ebusy;
2325 if (a->rsize != b->rsize)
2326 goto Ebusy;
2327 if (a->acregmin != b->acregmin)
2328 goto Ebusy;
2329 if (a->acregmax != b->acregmax)
2330 goto Ebusy;
2331 if (a->acdirmin != b->acdirmin)
2332 goto Ebusy;
2333 if (a->acdirmax != b->acdirmax)
2334 goto Ebusy;
0aea92bf
TM		 2335 if (b->flags & NFS_MOUNT_SECFLAVOUR &&
2336 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
275a5d24 2337 goto Ebusy;
e89a5a43 2338 return 1;
275a5d24 2339Ebusy:
e89a5a43
TM		 2340 return 0;
2341}
2342
2343struct nfs_sb_mountdata {
2344 struct nfs_server *server;
2345 int mntflags;
2346};
2347
2348static int nfs_set_super(struct super_block *s, void *data)
2349{
2350 struct nfs_sb_mountdata *sb_mntdata = data;
2351 struct nfs_server *server = sb_mntdata->server;
2352 int ret;
2353
2354 s->s_flags = sb_mntdata->mntflags;
2355 s->s_fs_info = server;
8b244ff2 2356 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2357 ret = set_anon_super(s, server);
2358 if (ret == 0)
2359 server->s_dev = s->s_dev;
2360 return ret;
2361}
2362
fd00a8ff
CL		 2363static int nfs_compare_super_address(struct nfs_server *server1,
2364 struct nfs_server *server2)
2365{
2366 struct sockaddr *sap1, *sap2;
2367
2368 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2369 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2370
2371 if (sap1->sa_family != sap2->sa_family)
2372 return 0;
2373
2374 switch (sap1->sa_family) {
2375 case AF_INET: {
2376 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2377 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2378 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2379 return 0;
2380 if (sin1->sin_port != sin2->sin_port)
2381 return 0;
2382 break;
2383 }
2384 case AF_INET6: {
2385 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2386 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2387 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2388 return 0;
2389 if (sin1->sin6_port != sin2->sin6_port)
2390 return 0;
2391 break;
2392 }
2393 default:
2394 return 0;
2395 }
2396
2397 return 1;
2398}
2399
e89a5a43
TM		 2400static int nfs_compare_super(struct super_block *sb, void *data)
2401{
2402 struct nfs_sb_mountdata *sb_mntdata = data;
2403 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2404 int mntflags = sb_mntdata->mntflags;
2405
fd00a8ff 2406 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2407 return 0;
2408 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2409 if (old->flags & NFS_MOUNT_UNSHARED)
2410 return 0;
2411 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2412 return 0;
2413 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2414}
2415
39ffb921 2416#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2417static void nfs_get_cache_cookie(struct super_block *sb,
2418 struct nfs_parsed_mount_data *parsed,
2419 struct nfs_clone_mount *cloned)
2420{
c4271c6e 2421 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2422 char *uniq = NULL;
2423 int ulen = 0;
2424
c4271c6e
TM		 2425 nfss->fscache_key = NULL;
2426 nfss->fscache = NULL;
2427
2428 if (parsed) {
2429 if (!(parsed->options & NFS_OPTION_FSCACHE))
2430 return;
2431 if (parsed->fscache_uniq) {
2432 uniq = parsed->fscache_uniq;
2433 ulen = strlen(parsed->fscache_uniq);
2434 }
2311b943
BS		 2435 } else if (cloned) {
2436 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2437 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2438 return;
2311b943
BS		 2439 if (mnt_s->fscache_key) {
2440 uniq = mnt_s->fscache_key->key.uniquifier;
2441 ulen = mnt_s->fscache_key->key.uniq_len;
2442 };
c4271c6e
TM		 2443 } else
2444 return;
2311b943
BS		 2445
2446 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2447}
39ffb921
TM		 2448#else
2449static void nfs_get_cache_cookie(struct super_block *sb,
2450 struct nfs_parsed_mount_data *parsed,
2451 struct nfs_clone_mount *cloned)
2452{
2453}
2454#endif
2311b943 2455
fa799759
MS		 2456static int nfs_bdi_register(struct nfs_server *server)
2457{
2458 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2459}
2460
fbdefd64
BS		 2461int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2462 struct nfs_mount_info *mount_info)
3d176e3f 2463{
aa9c2669
DQ		 2464 int error;
2465 unsigned long kflags = 0, kflags_out = 0;
2466 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2467 kflags |= SECURITY_LSM_NATIVE_LABELS;
2468
2469 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2470 kflags, &kflags_out);
2471 if (error)
2472 goto err;
2473
2474 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2475 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2476 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2477err:
2478 return error;
3d176e3f 2479}
89d77c8f 2480EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2481
fbdefd64
BS		 2482int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2483 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2484{
2485 /* clone any lsm security options from the parent to the new sb */
3d176e3f
BS		 2486 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2487 return -ESTALE;
094f7b69 2488 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
3d176e3f 2489}
89d77c8f 2490EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2491
ab7017a3 2492struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2493 int flags, const char *dev_name,
ab7017a3
BS		 2494 struct nfs_mount_info *mount_info,
2495 struct nfs_subversion *nfs_mod)
f7b422b1 2496{
f7b422b1 2497 struct super_block *s;
01194981 2498 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2499 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2500 struct nfs_sb_mountdata sb_mntdata = {
2501 .mntflags = flags,
c40f8d1d 2502 .server = server,
e89a5a43 2503 };
01194981 2504 int error;
33852a1f 2505
75180df2
TM		 2506 if (server->flags & NFS_MOUNT_UNSHARED)
2507 compare_super = NULL;
2508
fb2088cc
SP		 2509 /* -o noac implies -o sync */
2510 if (server->flags & NFS_MOUNT_NOAC)
2511 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2512
e890db01
SM		 2513 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2514 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2515 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2516
54ceac45 2517 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2518 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2519 if (IS_ERR(s)) {
01194981 2520 mntroot = ERR_CAST(s);
54ceac45 2521 goto out_err_nosb;
816724e6
TM		 2522 }
2523
54ceac45
DH		 2524 if (s->s_fs_info != server) {
2525 nfs_free_server(server);
2526 server = NULL;
fa799759
MS		 2527 } else {
2528 error = nfs_bdi_register(server);
01194981
AV		 2529 if (error) {
2530 mntroot = ERR_PTR(error);
cfbc0683 2531 goto error_splat_bdi;
01194981 2532 }
54ceac45 2533 }
f7b422b1 2534
54ceac45
DH		 2535 if (!s->s_root) {
2536 /* initial superblock/root creation */
c40f8d1d 2537 mount_info->fill_super(s, mount_info);
3d176e3f 2538 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2539 }
f7b422b1 2540
87c7083d 2541 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2542 if (IS_ERR(mntroot))
54ceac45 2543 goto error_splat_super;
816724e6 2544
3d176e3f 2545 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2546 if (error)
2547 goto error_splat_root;
2548
54ceac45 2549 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2550
2551out:
01194981 2552 return mntroot;
816724e6 2553
54ceac45
DH		 2554out_err_nosb:
2555 nfs_free_server(server);
0655960f 2556 goto out;
54ceac45 2557
f9c3a380
EP		 2558error_splat_root:
2559 dput(mntroot);
01194981 2560 mntroot = ERR_PTR(error);
54ceac45 2561error_splat_super:
cfbc0683
N		 2562 if (server && !s->s_root)
2563 bdi_unregister(&server->backing_dev_info);
2564error_splat_bdi:
6f5bbff9 2565 deactivate_locked_super(s);
0655960f 2566 goto out;
f7b422b1 2567}
89d77c8f 2568EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2569
fbdefd64 2570struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2571 int flags, const char *dev_name, void *raw_data)
2572{
c40f8d1d
BS		 2573 struct nfs_mount_info mount_info = {
2574 .fill_super = nfs_fill_super,
3d176e3f 2575 .set_security = nfs_set_sb_security,
c40f8d1d 2576 };
c40f8d1d 2577 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2578 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2579 int error;
2580
46058d46 2581 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2582 mount_info.mntfh = nfs_alloc_fhandle();
2583 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2584 goto out;
2585
2586 /* Validate the mount data */
87c7083d 2587 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2588 if (error == NFS_TEXT_DATA)
46058d46 2589 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2590 if (error < 0) {
2591 mntroot = ERR_PTR(error);
2592 goto out;
2593 }
c40f8d1d 2594
ab7017a3
BS		 2595 nfs_mod = get_nfs_version(mount_info.parsed->version);
2596 if (IS_ERR(nfs_mod)) {
2597 mntroot = ERR_CAST(nfs_mod);
2598 goto out;
2599 }
2600
ff9099f2 2601 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2602
2603 put_nfs_version(nfs_mod);
c40f8d1d 2604out:
46058d46 2605 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2606 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2607 return mntroot;
2608}
89d77c8f 2609EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2610
387c149b
TM		 2611/*
2612 * Ensure that we unregister the bdi before kill_anon_super
2613 * releases the device name
2614 */
fbdefd64 2615void nfs_put_super(struct super_block *s)
387c149b
TM		 2616{
2617 struct nfs_server *server = NFS_SB(s);
2618
2619 bdi_unregister(&server->backing_dev_info);
2620}
89d77c8f 2621EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2622
54ceac45
DH		 2623/*
2624 * Destroy an NFS2/3 superblock
2625 */
fbdefd64 2626void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2627{
2628 struct nfs_server *server = NFS_SB(s);
2629
2630 kill_anon_super(s);
08734048 2631 nfs_fscache_release_super_cookie(s);
54ceac45 2632 nfs_free_server(server);
f7b422b1 2633}
89d77c8f 2634EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2635
54ceac45 2636/*
8c958e0c 2637 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2638 */
3dd4f8ef 2639static struct dentry *
e8f25e6d
BS		 2640nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2641 const char *dev_name, void *raw_data)
f7b422b1 2642{
e8f25e6d
BS		 2643 struct nfs_clone_mount *data = raw_data;
2644 struct nfs_mount_info mount_info = {
2645 .fill_super = nfs_clone_super,
2646 .set_security = nfs_clone_sb_security,
2647 .cloned = data,
2648 };
54ceac45 2649 struct nfs_server *server;
3d176e3f 2650 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2651 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
f7b422b1 2652
dee972b9 2653 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2654
e8f25e6d 2655 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2656
54ceac45 2657 /* create a new volume representation */
1179acc6 2658 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
f7b422b1 2659
dee972b9
TM		 2660 if (IS_ERR(server))
2661 mntroot = ERR_CAST(server);
2662 else
2663 mntroot = nfs_fs_mount_common(server, flags,
2664 dev_name, &mount_info, nfs_mod);
24c8dbbb 2665
dee972b9
TM		 2666 dprintk("<-- nfs_xdev_mount() = %ld\n",
2667 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2668 return mntroot;
f7b422b1
DH		 2669}
2670
89d77c8f 2671#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2672
01c3f052
TM		 2673static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2674{
5eebde23
SJ		 2675 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2676 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2677}
2678
f0768ebd
CL		 2679/*
2680 * Validate NFSv4 mount options
2681 */
91ea40b9
TT		 2682static int nfs4_validate_mount_data(void *options,
2683 struct nfs_parsed_mount_data *args,
2684 const char *dev_name)
f0768ebd 2685{
4cfd74fc 2686 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2687 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2688 char *c;
2689
2690 if (data == NULL)
2691 goto out_no_data;
2692
cdf66442
BS		 2693 args->version = 4;
2694
f0768ebd
CL		 2695 switch (data->version) {
2696 case 1:
4c568017
CL		 2697 if (data->host_addrlen > sizeof(args->nfs_server.address))
2698 goto out_no_address;
2699 if (data->host_addrlen == 0)
f0768ebd 2700 goto out_no_address;
4c568017 2701 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2702 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2703 return -EFAULT;
4cfd74fc 2704 if (!nfs_verify_server_address(sap))
f0768ebd 2705 goto out_no_address;
872ece86 2706 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2707
6738b251 2708 if (data->auth_flavourlen) {
74c98811 2709 rpc_authflavor_t pseudoflavor;
6738b251
CL		 2710 if (data->auth_flavourlen > 1)
2711 goto out_inval_auth;
74c98811 2712 if (copy_from_user(&pseudoflavor,
91ea40b9 2713 data->auth_flavours,
74c98811 2714 sizeof(pseudoflavor)))
f0768ebd 2715 return -EFAULT;
74c98811
TM		 2716 nfs_set_auth_parsed_mount_data(args, pseudoflavor);
2717 } else
2718 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
f0768ebd
CL		 2719
2720 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2721 if (IS_ERR(c))
2722 return PTR_ERR(c);
91ea40b9 2723 args->nfs_server.hostname = c;
f0768ebd
CL		 2724
2725 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2726 if (IS_ERR(c))
2727 return PTR_ERR(c);
91ea40b9
TT		 2728 args->nfs_server.export_path = c;
2729 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2730
2731 c = strndup_user(data->client_addr.data, 16);
2732 if (IS_ERR(c))
2733 return PTR_ERR(c);
91ea40b9
TT		 2734 args->client_address = c;
2735
2736 /*
2737 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2738 * can deal with.
2739 */
2740
2741 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2742 args->rsize = data->rsize;
2743 args->wsize = data->wsize;
2744 args->timeo = data->timeo;
2745 args->retrans = data->retrans;
2746 args->acregmin = data->acregmin;
2747 args->acregmax = data->acregmax;
2748 args->acdirmin = data->acdirmin;
2749 args->acdirmax = data->acdirmax;
2750 args->nfs_server.protocol = data->proto;
259875ef 2751 nfs_validate_transport_protocol(args);
6da1a034
TM		 2752 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2753 goto out_invalid_transport_udp;
f0768ebd
CL		 2754
2755 break;
7630c852 2756 default:
b72e4f42 2757 return NFS_TEXT_DATA;
f0768ebd
CL		 2758 }
2759
2760 return 0;
2761
2762out_no_data:
2763 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2764 return -EINVAL;
2765
2766out_inval_auth:
2767 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2768 data->auth_flavourlen);
2769 return -EINVAL;
2770
2771out_no_address:
2772 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2773 return -EINVAL;
6da1a034
TM		 2774
2775out_invalid_transport_udp:
2776 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2777 return -EINVAL;
f0768ebd
CL		 2778}
2779
fac1e8e4
BS		 2780/*
2781 * NFS v4 module parameters need to stay in the
2782 * NFS client for backwards compatibility
2783 */
2784unsigned int nfs_callback_set_tcpport;
2785unsigned short nfs_callback_tcpport;
2786/* Default cache timeout is 10 minutes */
2787unsigned int nfs_idmap_cache_timeout = 600;
2788/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2789bool nfs4_disable_idmapping = true;
2790unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2791unsigned short send_implementation_id = 1;
6f2ea7f2 2792char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
f6de7a39 2793bool recover_lost_locks = false;
fac1e8e4 2794
89d77c8f
BS		 2795EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2796EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2797EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2798EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2799EXPORT_SYMBOL_GPL(max_session_slots);
2800EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2801EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
f6de7a39 2802EXPORT_SYMBOL_GPL(recover_lost_locks);
89d77c8f 2803
fac1e8e4
BS		 2804#define NFS_CALLBACK_MAXPORTNR (65535U)
2805
2806static int param_set_portnr(const char *val, const struct kernel_param *kp)
2807{
2808 unsigned long num;
2809 int ret;
2810
2811 if (!val)
2812 return -EINVAL;
7297cb68 2813 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2814 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2815 return -EINVAL;
2816 *((unsigned int *)kp->arg) = num;
2817 return 0;
2818}
2819static struct kernel_param_ops param_ops_portnr = {
2820 .set = param_set_portnr,
2821 .get = param_get_uint,
2822};
2823#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2824
2825module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2826module_param(nfs_idmap_cache_timeout, int, 0644);
2827module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2828module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2829 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2830MODULE_PARM_DESC(nfs4_disable_idmapping,
2831 "Turn off NFSv4 idmapping when using 'sec=sys'");
2832module_param(max_session_slots, ushort, 0644);
2833MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2834 "requests the client will negotiate");
2835module_param(send_implementation_id, ushort, 0644);
2836MODULE_PARM_DESC(send_implementation_id,
2837 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2838MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2839
f6de7a39
TM		 2840module_param(recover_lost_locks, bool, 0644);
2841MODULE_PARM_DESC(recover_lost_locks,
2842 "If the server reports that a lock might be lost, "
2843 "try to recover it risking data corruption.");
2844
2845
54ceac45 2846#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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