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[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
324d003b 57#include <linux/kthread.h>
f7b422b1 58
f7b422b1
DH		 59#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
08734048 66#include "fscache.h"
76e697ba 67#include "nfs4session.h"
ae50c0b5 68#include "pnfs.h"
ab7017a3 69#include "nfs.h"
f7b422b1
DH		 70
71#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 72#define NFS_TEXT_DATA 1
f7b422b1 73
1c606fb7 74#if IS_ENABLED(CONFIG_NFS_V3)
1e657bd5
PZ		 75#define NFS_DEFAULT_VERSION 3
76#else
77#define NFS_DEFAULT_VERSION 2
78#endif
79
bf0fd768
CL		 80enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
bf0fd768
CL		 83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
2cf7ff7a 87 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
75180df2 90 Opt_sharecache, Opt_nosharecache,
d740351b 91 Opt_resvport, Opt_noresvport,
b797cac7 92 Opt_fscache, Opt_nofscache,
89652617 93 Opt_migration, Opt_nomigration,
bf0fd768
CL		 94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
e887cbcf 104 Opt_mountvers,
3fd5be9e 105 Opt_minorversion,
bf0fd768
CL		 106
107 /* Mount options that take string arguments */
0d71b058 108 Opt_nfsvers,
33832034 109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 111 Opt_lookupcache,
b797cac7 112 Opt_fscache_uniq,
5eebde23 113 Opt_local_lock,
bf0fd768 114
f45663ce
CL		 115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 117
118 Opt_err
119};
120
a447c093 121static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
ecbb3845
CL		 124 { Opt_userspace, "retry=%s" },
125
f45663ce
CL		 126 { Opt_sloppy, "sloppy" },
127
bf0fd768
CL		 128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
d33e4dfe
CL		 130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
bf0fd768
CL		 132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
bf0fd768
CL		 140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
2cf7ff7a 142 { Opt_rdma, "rdma" },
bf0fd768
CL		 143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
b797cac7 151 { Opt_fscache, "fsc" },
b797cac7 152 { Opt_nofscache, "nofsc" },
89652617
CL		 153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
bf0fd768 155
a5a16bae
CL		 156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 170 { Opt_minorversion, "minorversion=%s" },
171
a5a16bae
CL		 172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
33832034 180 { Opt_mounthost, "mounthost=%s" },
0ac83779 181 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 182
7973c1f1 183 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 184 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 185 { Opt_local_lock, "local_lock=%s" },
7973c1f1 186
3862279a
TM		 187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
bf0fd768
CL		 190 { Opt_err, NULL }
191};
192
193enum {
ee671b01 194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 195
196 Opt_xprt_err
197};
198
a447c093 199static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 200 { Opt_xprt_udp, "udp" },
ee671b01 201 { Opt_xprt_udp6, "udp6" },
bf0fd768 202 { Opt_xprt_tcp, "tcp" },
ee671b01 203 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 204 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 205
206 { Opt_xprt_err, NULL }
207};
208
209enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216};
217
a447c093 218static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
8d042218
OK		 231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
bf0fd768
CL		 235 { Opt_sec_err, NULL }
236};
237
7973c1f1
TM		 238enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243};
244
245static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252};
253
5eebde23
SJ		 254enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259};
260
261static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268};
269
0d71b058
TM		 270enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1,
273
274 Opt_vers_err
275};
276
277static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283
284 { Opt_vers_err, NULL }
285};
bf0fd768 286
31f43471
AV		 287static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
f7b422b1 289
ab7017a3 290struct file_system_type nfs_fs_type = {
f7b422b1
DH		 291 .owner = THIS_MODULE,
292 .name = "nfs",
01194981 293 .mount = nfs_fs_mount,
f7b422b1 294 .kill_sb = nfs_kill_super,
349457cc 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1 296};
ddda8e0a 297EXPORT_SYMBOL_GPL(nfs_fs_type);
f7b422b1 298
54ceac45 299struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 300 .owner = THIS_MODULE,
301 .name = "nfs",
31f43471 302 .mount = nfs_xdev_mount,
f7b422b1 303 .kill_sb = nfs_kill_super,
349457cc 304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 305};
306
6a74490d 307const struct super_operations nfs_sops = {
f7b422b1
DH		 308 .alloc_inode = nfs_alloc_inode,
309 .destroy_inode = nfs_destroy_inode,
310 .write_inode = nfs_write_inode,
eed99357 311 .drop_inode = nfs_drop_inode,
387c149b 312 .put_super = nfs_put_super,
f7b422b1 313 .statfs = nfs_statfs,
b57922d9 314 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 315 .umount_begin = nfs_umount_begin,
316 .show_options = nfs_show_options,
c7f404b4
AV		 317 .show_devname = nfs_show_devname,
318 .show_path = nfs_show_path,
f7b422b1 319 .show_stats = nfs_show_stats,
48b605f8 320 .remount_fs = nfs_remount,
f7b422b1 321};
ddda8e0a 322EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 323
89d77c8f 324#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42 325static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 326static int nfs4_validate_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
1ae811ee 328
329struct file_system_type nfs4_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .mount = nfs_fs_mount,
333 .kill_sb = nfs_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
335};
336EXPORT_SYMBOL_GPL(nfs4_fs_type);
337
338static int __init register_nfs4_fs(void)
339{
340 return register_filesystem(&nfs4_fs_type);
341}
342
343static void unregister_nfs4_fs(void)
344{
345 unregister_filesystem(&nfs4_fs_type);
346}
347#else
348static int __init register_nfs4_fs(void)
349{
350 return 0;
351}
352
353static void unregister_nfs4_fs(void)
354{
355}
f7b422b1
DH		 356#endif
357
8e1f936b
RR		 358static struct shrinker acl_shrinker = {
359 .shrink = nfs_access_cache_shrinker,
360 .seeks = DEFAULT_SEEKS,
361};
979df72e 362
f7b422b1
DH		 363/*
364 * Register the NFS filesystems
365 */
366int __init register_nfs_fs(void)
367{
368 int ret;
369
370 ret = register_filesystem(&nfs_fs_type);
371 if (ret < 0)
372 goto error_0;
373
1ae811ee 374 ret = register_nfs4_fs();
f7b422b1
DH		 375 if (ret < 0)
376 goto error_1;
1ae811ee 377
378 ret = nfs_register_sysctl();
379 if (ret < 0)
380 goto error_2;
8e1f936b 381 register_shrinker(&acl_shrinker);
f7b422b1
DH		 382 return 0;
383
1ae811ee 384error_2:
385 unregister_nfs4_fs();
f7b422b1
DH		 386error_1:
387 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 388error_0:
389 return ret;
390}
391
392/*
393 * Unregister the NFS filesystems
394 */
395void __exit unregister_nfs_fs(void)
396{
8e1f936b 397 unregister_shrinker(&acl_shrinker);
49af7ee1 398 nfs_unregister_sysctl();
1ae811ee 399 unregister_nfs4_fs();
f7b422b1
DH		 400 unregister_filesystem(&nfs_fs_type);
401}
402
1daef0a8 403void nfs_sb_active(struct super_block *sb)
ef818a28 404{
1daef0a8 405 struct nfs_server *server = NFS_SB(sb);
ef818a28 406
1daef0a8
TM		 407 if (atomic_inc_return(&server->active) == 1)
408 atomic_inc(&sb->s_active);
ef818a28 409}
89d77c8f 410EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 411
1daef0a8 412void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 413{
414 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 415
416 if (atomic_dec_and_test(&server->active))
417 deactivate_super(sb);
ef818a28 418}
89d77c8f 419EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 420
324d003b
WAA		 421static int nfs_deactivate_super_async_work(void *ptr)
422{
423 struct super_block *sb = ptr;
424
425 deactivate_super(sb);
426 module_put_and_exit(0);
427 return 0;
428}
429
430/*
431 * same effect as deactivate_super, but will do final unmount in kthread
432 * context
433 */
434static void nfs_deactivate_super_async(struct super_block *sb)
435{
436 struct task_struct *task;
437 char buf[INET6_ADDRSTRLEN + 1];
438 struct nfs_server *server = NFS_SB(sb);
439 struct nfs_client *clp = server->nfs_client;
440
441 if (!atomic_add_unless(&sb->s_active, -1, 1)) {
442 rcu_read_lock();
443 snprintf(buf, sizeof(buf),
444 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
445 rcu_read_unlock();
446
447 __module_get(THIS_MODULE);
448 task = kthread_run(nfs_deactivate_super_async_work, sb,
449 "%s-deactivate-super", buf);
450 if (IS_ERR(task)) {
451 pr_err("%s: kthread_run: %ld\n",
452 __func__, PTR_ERR(task));
453 /* make synchronous call and hope for the best */
454 deactivate_super(sb);
455 module_put(THIS_MODULE);
456 }
457 }
458}
459
460void nfs_sb_deactive_async(struct super_block *sb)
461{
462 struct nfs_server *server = NFS_SB(sb);
463
464 if (atomic_dec_and_test(&server->active))
465 nfs_deactivate_super_async(sb);
466}
467EXPORT_SYMBOL_GPL(nfs_sb_deactive_async);
468
f7b422b1
DH		 469/*
470 * Deliver file system statistics to userspace
471 */
fbdefd64 472int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 473{
0c7d90cf 474 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 475 unsigned char blockbits;
476 unsigned long blockres;
0c7d90cf 477 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 478 struct nfs_fsstat res;
479 int error = -ENOMEM;
480
481 res.fattr = nfs_alloc_fattr();
482 if (res.fattr == NULL)
483 goto out_err;
f7b422b1 484
8fa5c000 485 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 486 if (unlikely(error == -ESTALE)) {
487 struct dentry *pd_dentry;
488
489 pd_dentry = dget_parent(dentry);
490 if (pd_dentry != NULL) {
491 nfs_zap_caches(pd_dentry->d_inode);
492 dput(pd_dentry);
493 }
494 }
ca7e9a0d 495 nfs_free_fattr(res.fattr);
f7b422b1
DH		 496 if (error < 0)
497 goto out_err;
ca7e9a0d 498
1a0ba9ae 499 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 500
501 /*
502 * Current versions of glibc do not correctly handle the
503 * case where f_frsize != f_bsize. Eventually we want to
504 * report the value of wtmult in this field.
505 */
0c7d90cf 506 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 507
508 /*
509 * On most *nix systems, f_blocks, f_bfree, and f_bavail
510 * are reported in units of f_frsize. Linux hasn't had
511 * an f_frsize field in its statfs struct until recently,
512 * thus historically Linux's sys_statfs reports these
513 * fields in units of f_bsize.
514 */
0c7d90cf
DH		 515 buf->f_bsize = dentry->d_sb->s_blocksize;
516 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 517 blockres = (1 << blockbits) - 1;
518 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
519 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
520 buf->f_bavail = (res.abytes + blockres) >> blockbits;
521
522 buf->f_files = res.tfiles;
523 buf->f_ffree = res.afiles;
524
525 buf->f_namelen = server->namelen;
1a0ba9ae 526
f7b422b1
DH		 527 return 0;
528
529 out_err:
3110ff80 530 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 531 return error;
f7b422b1 532}
89d77c8f 533EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 534
7d4e2747
DH		 535/*
536 * Map the security flavour number to a name
537 */
81039f1f
TM		 538static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
539{
7d4e2747 540 static const struct {
81039f1f
TM		 541 rpc_authflavor_t flavour;
542 const char *str;
543 } sec_flavours[] = {
544 { RPC_AUTH_NULL, "null" },
545 { RPC_AUTH_UNIX, "sys" },
546 { RPC_AUTH_GSS_KRB5, "krb5" },
547 { RPC_AUTH_GSS_KRB5I, "krb5i" },
548 { RPC_AUTH_GSS_KRB5P, "krb5p" },
549 { RPC_AUTH_GSS_LKEY, "lkey" },
550 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
551 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
552 { RPC_AUTH_GSS_SPKM, "spkm" },
553 { RPC_AUTH_GSS_SPKMI, "spkmi" },
554 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 555 { UINT_MAX, "unknown" }
81039f1f
TM		 556 };
557 int i;
558
4d81cd16 559 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 560 if (sec_flavours[i].flavour == flavour)
561 break;
562 }
563 return sec_flavours[i].str;
564}
565
ee671b01
JL		 566static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
567 int showdefaults)
568{
569 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
570
571 seq_printf(m, ",mountproto=");
572 switch (sap->sa_family) {
573 case AF_INET:
574 switch (nfss->mountd_protocol) {
575 case IPPROTO_UDP:
576 seq_printf(m, RPCBIND_NETID_UDP);
577 break;
578 case IPPROTO_TCP:
579 seq_printf(m, RPCBIND_NETID_TCP);
580 break;
581 default:
582 if (showdefaults)
583 seq_printf(m, "auto");
584 }
585 break;
586 case AF_INET6:
587 switch (nfss->mountd_protocol) {
588 case IPPROTO_UDP:
589 seq_printf(m, RPCBIND_NETID_UDP6);
590 break;
591 case IPPROTO_TCP:
592 seq_printf(m, RPCBIND_NETID_TCP6);
593 break;
594 default:
595 if (showdefaults)
596 seq_printf(m, "auto");
597 }
598 break;
599 default:
600 if (showdefaults)
601 seq_printf(m, "auto");
602 }
603}
604
82d101d5
CL		 605static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607{
608 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
609
d5eff1a3
BS		 610 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
611 return;
612
82d101d5
CL		 613 switch (sap->sa_family) {
614 case AF_INET: {
615 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 616 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 617 break;
618 }
619 case AF_INET6: {
620 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 621 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 622 break;
623 }
624 default:
625 if (showdefaults)
626 seq_printf(m, ",mountaddr=unspecified");
627 }
628
629 if (nfss->mountd_version || showdefaults)
630 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 631 if ((nfss->mountd_port &&
632 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
633 showdefaults)
82d101d5
CL		 634 seq_printf(m, ",mountport=%u", nfss->mountd_port);
635
ee671b01 636 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 637}
638
89d77c8f 639#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 640static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
641 int showdefaults)
642{
643 struct nfs_client *clp = nfss->nfs_client;
644
645 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 646}
647#else
648static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
649 int showdefaults)
650{
651}
652#endif
653
7bbceb6f
TM		 654static void nfs_show_nfs_version(struct seq_file *m,
655 unsigned int version,
656 unsigned int minorversion)
657{
658 seq_printf(m, ",vers=%u", version);
659 if (version == 4)
660 seq_printf(m, ".%u", minorversion);
661}
662
f7b422b1
DH		 663/*
664 * Describe the mount options in force on this server representation
665 */
82d101d5
CL		 666static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
667 int showdefaults)
f7b422b1 668{
509de811 669 static const struct proc_nfs_info {
f7b422b1 670 int flag;
509de811
DH		 671 const char *str;
672 const char *nostr;
f7b422b1
DH		 673 } nfs_info[] = {
674 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 675 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 676 { NFS_MOUNT_NOCTO, ",nocto", "" },
677 { NFS_MOUNT_NOAC, ",noac", "" },
678 { NFS_MOUNT_NONLM, ",nolock", "" },
679 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 680 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 681 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
682 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 683 { 0, NULL, NULL }
684 };
509de811 685 const struct proc_nfs_info *nfs_infop;
8fa5c000 686 struct nfs_client *clp = nfss->nfs_client;
82d101d5 687 u32 version = clp->rpc_ops->version;
7c563cc9 688 int local_flock, local_fcntl;
f7b422b1 689
7bbceb6f 690 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 691 seq_printf(m, ",rsize=%u", nfss->rsize);
692 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 693 if (nfss->bsize != 0)
694 seq_printf(m, ",bsize=%u", nfss->bsize);
695 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 696 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 697 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 698 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 699 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 700 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 701 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 702 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 703 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 704 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
705 if (nfss->flags & nfs_infop->flag)
706 seq_puts(m, nfs_infop->str);
707 else
708 seq_puts(m, nfs_infop->nostr);
709 }
2446ab60 710 rcu_read_lock();
56928edd 711 seq_printf(m, ",proto=%s",
ee671b01 712 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 713 rcu_read_unlock();
82d101d5
CL		 714 if (version == 4) {
715 if (nfss->port != NFS_PORT)
716 seq_printf(m, ",port=%u", nfss->port);
717 } else
718 if (nfss->port)
719 seq_printf(m, ",port=%u", nfss->port);
720
33170233
TM		 721 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
722 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 723 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 724
725 if (version != 4)
726 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 727 else
728 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 729
b797cac7
DH		 730 if (nfss->options & NFS_OPTION_FSCACHE)
731 seq_printf(m, ",fsc");
9b00c643 732
89652617
CL		 733 if (nfss->options & NFS_OPTION_MIGRATION)
734 seq_printf(m, ",migration");
735
9b00c643
PL		 736 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
738 seq_printf(m, ",lookupcache=none");
739 else
740 seq_printf(m, ",lookupcache=pos");
741 }
7c563cc9
SJ		 742
743 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
744 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
745
746 if (!local_flock && !local_fcntl)
747 seq_printf(m, ",local_lock=none");
748 else if (local_flock && local_fcntl)
749 seq_printf(m, ",local_lock=all");
750 else if (local_flock)
751 seq_printf(m, ",local_lock=flock");
752 else
753 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 754}
755
756/*
757 * Describe the mount options on this VFS mountpoint
758 */
fbdefd64 759int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 760{
34c80b1d 761 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 762
763 nfs_show_mount_options(m, nfss, 0);
764
2446ab60 765 rcu_read_lock();
5d8515ca
CL		 766 seq_printf(m, ",addr=%s",
767 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
768 RPC_DISPLAY_ADDR));
2446ab60 769 rcu_read_unlock();
f7b422b1
DH		 770
771 return 0;
772}
89d77c8f 773EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 774
89d77c8f 775#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 776#ifdef CONFIG_NFS_V4_1
45402c38 777static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 778{
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781}
782#else
45402c38
HS		 783static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784#endif
ae50c0b5
BF		 785#endif
786
787#ifdef CONFIG_NFS_V4_1
45402c38 788static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 789{
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795}
7e03b7cc
TM		 796
797static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798{
59155546
CL		 799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806}
45402c38 807#else
89d77c8f 808#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 809static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810{
811}
45402c38 812#endif
7e03b7cc
TM		 813static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814{
815}
45402c38 816#endif
f7b422b1 817
fbdefd64 818int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 819{
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
97a54868 825 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832}
89d77c8f 833EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 834
fbdefd64 835int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 836{
837 seq_puts(m, "/");
838 return 0;
839}
89d77c8f 840EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 841
f7b422b1
DH		 842/*
843 * Present statistical information for this VFS mountpoint
844 */
fbdefd64 845int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 846{
847 int i, cpu;
64132379 848 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 849 struct rpc_auth *auth = nfss->client->cl_auth;
850 struct nfs_iostats totals = { };
851
852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853
854 /*
855 * Display all mount option settings
856 */
857 seq_printf(m, "\n\topts:\t");
64132379
AV		 858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 862 nfs_show_mount_options(m, nfss, 1);
863
864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
865
7e03b7cc 866 show_implementation_id(m, nfss);
7d2ed9ac 867
f7b422b1
DH		 868 seq_printf(m, "\n\tcaps:\t");
869 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 870 seq_printf(m, ",wtmult=%u", nfss->wtmult);
871 seq_printf(m, ",dtsize=%u", nfss->dtsize);
872 seq_printf(m, ",bsize=%u", nfss->bsize);
873 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 874
89d77c8f 875#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 876 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 877 seq_printf(m, "\n\tnfsv4:\t");
878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 881 show_sessions(m, nfss);
882 show_pnfs(m, nfss);
f7b422b1
DH		 883 }
884#endif
885
886 /*
887 * Display security flavor in effect for this mount
888 */
2d767432 889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 890 if (auth->au_flavor)
2d767432 891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 892
893 /*
894 * Display superblock I/O counters
895 */
896 for_each_possible_cpu(cpu) {
897 struct nfs_iostats *stats;
898
899 preempt_disable();
900 stats = per_cpu_ptr(nfss->io_stats, cpu);
901
902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
903 totals.events[i] += stats->events[i];
904 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
905 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 906#ifdef CONFIG_NFS_FSCACHE
907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
908 totals.fscache[i] += stats->fscache[i];
909#endif
f7b422b1
DH		 910
911 preempt_enable();
912 }
913
914 seq_printf(m, "\n\tevents:\t");
915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
916 seq_printf(m, "%lu ", totals.events[i]);
917 seq_printf(m, "\n\tbytes:\t");
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 920#ifdef CONFIG_NFS_FSCACHE
921 if (nfss->options & NFS_OPTION_FSCACHE) {
922 seq_printf(m, "\n\tfsc:\t");
923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
924 seq_printf(m, "%Lu ", totals.bytes[i]);
925 }
926#endif
f7b422b1
DH		 927 seq_printf(m, "\n");
928
929 rpc_print_iostats(m, nfss->client);
930
931 return 0;
932}
89d77c8f 933EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 934
935/*
936 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 937 * in response to xdev traversals and referrals
f7b422b1 938 */
fbdefd64 939void nfs_umount_begin(struct super_block *sb)
f7b422b1 940{
67e55205 941 struct nfs_server *server;
fc6ae3cf
TM		 942 struct rpc_clnt *rpc;
943
67e55205 944 server = NFS_SB(sb);
fc6ae3cf
TM		 945 /* -EIO all pending I/O */
946 rpc = server->client_acl;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
949 rpc = server->client;
950 if (!IS_ERR(rpc))
951 rpc_killall_tasks(rpc);
f7b422b1 952}
89d77c8f 953EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 954
db833351 955static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 956{
957 struct nfs_parsed_mount_data *data;
958
959 data = kzalloc(sizeof(*data), GFP_KERNEL);
960 if (data) {
9423a08a
CL		 961 data->acregmin = NFS_DEF_ACREGMIN;
962 data->acregmax = NFS_DEF_ACREGMAX;
963 data->acdirmin = NFS_DEF_ACDIRMIN;
964 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 965 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 966 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 967 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 968 data->auth_flavors[0] = RPC_AUTH_UNIX;
969 data->auth_flavor_len = 1;
970 data->minorversion = 0;
b72e4f42 971 data->need_mount = true;
9937347a 972 data->net = current->nsproxy->net_ns;
8a0d551a 973 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 974 }
975 return data;
976}
977
8a0d551a
JL		 978static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
979{
980 if (data) {
981 kfree(data->client_address);
982 kfree(data->mount_server.hostname);
983 kfree(data->nfs_server.export_path);
984 kfree(data->nfs_server.hostname);
985 kfree(data->fscache_uniq);
986 security_free_mnt_opts(&data->lsm_opts);
987 kfree(data);
988 }
989}
990
fc50d58f 991/*
cdcd7f9a
CL		 992 * Sanity-check a server address provided by the mount command.
993 *
994 * Address family must be initialized, and address must not be
995 * the ANY address for that family.
fc50d58f
CL		 996 */
997static int nfs_verify_server_address(struct sockaddr *addr)
998{
999 switch (addr->sa_family) {
1000 case AF_INET: {
cdcd7f9a 1001 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 1002 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 1003 }
1004 case AF_INET6: {
1005 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1006 return !ipv6_addr_any(sa);
fc50d58f
CL		 1007 }
1008 }
1009
53a0b9c4 1010 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1011 return 0;
1012}
1013
4cfd74fc
CL		 1014/*
1015 * Select between a default port value and a user-specified port value.
1016 * If a zero value is set, then autobind will be used.
1017 */
f5855fec 1018static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1019 const unsigned short default_port)
1020{
f5855fec
TM		 1021 if (*port == NFS_UNSPEC_PORT)
1022 *port = default_port;
4cfd74fc 1023
f5855fec 1024 rpc_set_port(sap, *port);
4cfd74fc
CL		 1025}
1026
259875ef
TM		 1027/*
1028 * Sanity check the NFS transport protocol.
1029 *
1030 */
1031static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1032{
1033 switch (mnt->nfs_server.protocol) {
1034 case XPRT_TRANSPORT_UDP:
1035 case XPRT_TRANSPORT_TCP:
1036 case XPRT_TRANSPORT_RDMA:
1037 break;
1038 default:
1039 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1040 }
1041}
1042
1043/*
1044 * For text based NFSv2/v3 mounts, the mount protocol transport default
1045 * settings should depend upon the specified NFS transport.
1046 */
1047static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1048{
1049 nfs_validate_transport_protocol(mnt);
1050
1051 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1052 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1053 return;
1054 switch (mnt->nfs_server.protocol) {
1055 case XPRT_TRANSPORT_UDP:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1057 break;
1058 case XPRT_TRANSPORT_TCP:
1059 case XPRT_TRANSPORT_RDMA:
1060 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1061 }
1062}
1063
01060c89
CL		 1064/*
1065 * Parse the value of the 'sec=' option.
01060c89
CL		 1066 */
1067static int nfs_parse_security_flavors(char *value,
1068 struct nfs_parsed_mount_data *mnt)
1069{
1070 substring_t args[MAX_OPT_ARGS];
1071
1072 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1073
1074 switch (match_token(value, nfs_secflavor_tokens, args)) {
1075 case Opt_sec_none:
01060c89
CL		 1076 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1077 break;
1078 case Opt_sec_sys:
01060c89
CL		 1079 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1080 break;
1081 case Opt_sec_krb5:
01060c89
CL		 1082 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1083 break;
1084 case Opt_sec_krb5i:
01060c89
CL		 1085 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1086 break;
1087 case Opt_sec_krb5p:
01060c89
CL		 1088 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1089 break;
1090 case Opt_sec_lkey:
01060c89
CL		 1091 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1092 break;
1093 case Opt_sec_lkeyi:
01060c89
CL		 1094 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1095 break;
1096 case Opt_sec_lkeyp:
01060c89
CL		 1097 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1098 break;
1099 case Opt_sec_spkm:
01060c89
CL		 1100 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1101 break;
1102 case Opt_sec_spkmi:
01060c89
CL		 1103 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1104 break;
1105 case Opt_sec_spkmp:
01060c89
CL		 1106 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1107 break;
1108 default:
1109 return 0;
1110 }
1111
9b7160c5 1112 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1113 mnt->auth_flavor_len = 1;
01060c89
CL		 1114 return 1;
1115}
1116
0d71b058
TM		 1117static int nfs_parse_version_string(char *string,
1118 struct nfs_parsed_mount_data *mnt,
1119 substring_t *args)
1120{
1121 mnt->flags &= ~NFS_MOUNT_VER3;
1122 switch (match_token(string, nfs_vers_tokens, args)) {
1123 case Opt_vers_2:
1124 mnt->version = 2;
1125 break;
1126 case Opt_vers_3:
1127 mnt->flags |= NFS_MOUNT_VER3;
1128 mnt->version = 3;
1129 break;
1130 case Opt_vers_4:
1131 /* Backward compatibility option. In future,
1132 * the mount program should always supply
1133 * a NFSv4 minor version number.
1134 */
1135 mnt->version = 4;
1136 break;
1137 case Opt_vers_4_0:
1138 mnt->version = 4;
1139 mnt->minorversion = 0;
1140 break;
1141 case Opt_vers_4_1:
1142 mnt->version = 4;
1143 mnt->minorversion = 1;
1144 break;
1145 default:
1146 return 0;
1147 }
1148 return 1;
1149}
1150
c5cb09b6
RL		 1151static int nfs_get_option_str(substring_t args[], char **option)
1152{
1153 kfree(*option);
1154 *option = match_strdup(args);
1155 return !option;
1156}
1157
1158static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1159{
1160 int rc;
1161 char *string;
1162
1163 string = match_strdup(args);
1164 if (string == NULL)
1165 return -ENOMEM;
7297cb68 1166 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1167 kfree(string);
1168
1169 return rc;
1170}
1171
bf0fd768
CL		 1172/*
1173 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1174 * a data structure. The whole mount string is processed; bad options are
1175 * skipped as they are encountered. If there were no errors, return 1;
1176 * otherwise return 0 (zero).
bf0fd768
CL		 1177 */
1178static int nfs_parse_mount_options(char *raw,
1179 struct nfs_parsed_mount_data *mnt)
1180{
f9c3a380 1181 char *p, *string, *secdata;
d23c45fd 1182 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1183 unsigned short protofamily = AF_UNSPEC;
1184 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1185
1186 if (!raw) {
1187 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1188 return 1;
1189 }
1190 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1191
f9c3a380
EP		 1192 secdata = alloc_secdata();
1193 if (!secdata)
1194 goto out_nomem;
1195
1196 rc = security_sb_copy_data(raw, secdata);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1201 if (rc)
1202 goto out_security_failure;
1203
1204 free_secdata(secdata);
1205
bf0fd768
CL		 1206 while ((p = strsep(&raw, ",")) != NULL) {
1207 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1208 unsigned long option;
1209 int token;
bf0fd768
CL		 1210
1211 if (!*p)
1212 continue;
1213
1214 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1215
1216 token = match_token(p, nfs_mount_option_tokens, args);
1217 switch (token) {
f45663ce
CL		 1218
1219 /*
1220 * boolean options: foo/nofoo
1221 */
bf0fd768
CL		 1222 case Opt_soft:
1223 mnt->flags |= NFS_MOUNT_SOFT;
1224 break;
1225 case Opt_hard:
1226 mnt->flags &= ~NFS_MOUNT_SOFT;
1227 break;
bf0fd768
CL		 1228 case Opt_posix:
1229 mnt->flags |= NFS_MOUNT_POSIX;
1230 break;
1231 case Opt_noposix:
1232 mnt->flags &= ~NFS_MOUNT_POSIX;
1233 break;
1234 case Opt_cto:
1235 mnt->flags &= ~NFS_MOUNT_NOCTO;
1236 break;
1237 case Opt_nocto:
1238 mnt->flags |= NFS_MOUNT_NOCTO;
1239 break;
1240 case Opt_ac:
1241 mnt->flags &= ~NFS_MOUNT_NOAC;
1242 break;
1243 case Opt_noac:
1244 mnt->flags |= NFS_MOUNT_NOAC;
1245 break;
1246 case Opt_lock:
1247 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1248 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1249 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1250 break;
1251 case Opt_nolock:
1252 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1253 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1254 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1255 break;
bf0fd768
CL		 1256 case Opt_udp:
1257 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1259 break;
1260 case Opt_tcp:
1261 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1263 break;
2cf7ff7a
TT		 1264 case Opt_rdma:
1265 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1266 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1267 xprt_load_transport(p);
2cf7ff7a 1268 break;
bf0fd768
CL		 1269 case Opt_acl:
1270 mnt->flags &= ~NFS_MOUNT_NOACL;
1271 break;
1272 case Opt_noacl:
1273 mnt->flags |= NFS_MOUNT_NOACL;
1274 break;
1275 case Opt_rdirplus:
1276 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1277 break;
1278 case Opt_nordirplus:
1279 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1280 break;
75180df2
TM		 1281 case Opt_sharecache:
1282 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1283 break;
1284 case Opt_nosharecache:
1285 mnt->flags |= NFS_MOUNT_UNSHARED;
1286 break;
d740351b
CL		 1287 case Opt_resvport:
1288 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1289 break;
1290 case Opt_noresvport:
1291 mnt->flags |= NFS_MOUNT_NORESVPORT;
1292 break;
b797cac7
DH		 1293 case Opt_fscache:
1294 mnt->options |= NFS_OPTION_FSCACHE;
1295 kfree(mnt->fscache_uniq);
1296 mnt->fscache_uniq = NULL;
1297 break;
1298 case Opt_nofscache:
1299 mnt->options &= ~NFS_OPTION_FSCACHE;
1300 kfree(mnt->fscache_uniq);
1301 mnt->fscache_uniq = NULL;
1302 break;
89652617
CL		 1303 case Opt_migration:
1304 mnt->options |= NFS_OPTION_MIGRATION;
1305 break;
1306 case Opt_nomigration:
1307 mnt->options &= NFS_OPTION_MIGRATION;
1308 break;
bf0fd768 1309
f45663ce
CL		 1310 /*
1311 * options that take numeric values
1312 */
bf0fd768 1313 case Opt_port:
c5cb09b6
RL		 1314 if (nfs_get_option_ul(args, &option) ||
1315 option > USHRT_MAX)
d23c45fd
CL		 1316 goto out_invalid_value;
1317 mnt->nfs_server.port = option;
bf0fd768
CL		 1318 break;
1319 case Opt_rsize:
c5cb09b6 1320 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1321 goto out_invalid_value;
1322 mnt->rsize = option;
bf0fd768
CL		 1323 break;
1324 case Opt_wsize:
c5cb09b6 1325 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1326 goto out_invalid_value;
1327 mnt->wsize = option;
bf0fd768
CL		 1328 break;
1329 case Opt_bsize:
c5cb09b6 1330 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1331 goto out_invalid_value;
1332 mnt->bsize = option;
bf0fd768
CL		 1333 break;
1334 case Opt_timeo:
c5cb09b6 1335 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1336 goto out_invalid_value;
1337 mnt->timeo = option;
bf0fd768
CL		 1338 break;
1339 case Opt_retrans:
c5cb09b6 1340 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1341 goto out_invalid_value;
1342 mnt->retrans = option;
bf0fd768
CL		 1343 break;
1344 case Opt_acregmin:
c5cb09b6 1345 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1346 goto out_invalid_value;
1347 mnt->acregmin = option;
bf0fd768
CL		 1348 break;
1349 case Opt_acregmax:
c5cb09b6 1350 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1351 goto out_invalid_value;
1352 mnt->acregmax = option;
bf0fd768
CL		 1353 break;
1354 case Opt_acdirmin:
c5cb09b6 1355 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1356 goto out_invalid_value;
1357 mnt->acdirmin = option;
bf0fd768
CL		 1358 break;
1359 case Opt_acdirmax:
c5cb09b6 1360 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1361 goto out_invalid_value;
1362 mnt->acdirmax = option;
bf0fd768
CL		 1363 break;
1364 case Opt_actimeo:
c5cb09b6 1365 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1366 goto out_invalid_value;
1367 mnt->acregmin = mnt->acregmax =
1368 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1369 break;
1370 case Opt_namelen:
c5cb09b6 1371 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1372 goto out_invalid_value;
1373 mnt->namlen = option;
bf0fd768
CL		 1374 break;
1375 case Opt_mountport:
c5cb09b6
RL		 1376 if (nfs_get_option_ul(args, &option) ||
1377 option > USHRT_MAX)
d23c45fd
CL		 1378 goto out_invalid_value;
1379 mnt->mount_server.port = option;
bf0fd768 1380 break;
bf0fd768 1381 case Opt_mountvers:
c5cb09b6 1382 if (nfs_get_option_ul(args, &option) ||
f45663ce 1383 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1384 option > NFS_MNT3_VERSION)
1385 goto out_invalid_value;
1386 mnt->mount_server.version = option;
bf0fd768 1387 break;
3fd5be9e 1388 case Opt_minorversion:
c5cb09b6 1389 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1390 goto out_invalid_value;
1391 if (option > NFS4_MAX_MINOR_VERSION)
1392 goto out_invalid_value;
1393 mnt->minorversion = option;
3fd5be9e 1394 break;
bf0fd768 1395
f45663ce
CL		 1396 /*
1397 * options that take text values
1398 */
0d71b058
TM		 1399 case Opt_nfsvers:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
1403 rc = nfs_parse_version_string(string, mnt, args);
1404 kfree(string);
1405 if (!rc)
1406 goto out_invalid_value;
1407 break;
bf0fd768
CL		 1408 case Opt_sec:
1409 string = match_strdup(args);
1410 if (string == NULL)
1411 goto out_nomem;
01060c89 1412 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1413 kfree(string);
f45663ce 1414 if (!rc) {
f45663ce
CL		 1415 dfprintk(MOUNT, "NFS: unrecognized "
1416 "security flavor\n");
d23c45fd 1417 return 0;
f45663ce 1418 }
bf0fd768
CL		 1419 break;
1420 case Opt_proto:
1421 string = match_strdup(args);
1422 if (string == NULL)
1423 goto out_nomem;
1424 token = match_token(string,
1425 nfs_xprt_protocol_tokens, args);
bf0fd768 1426
ee671b01 1427 protofamily = AF_INET;
bf0fd768 1428 switch (token) {
ee671b01
JL		 1429 case Opt_xprt_udp6:
1430 protofamily = AF_INET6;
fdb66ff4 1431 case Opt_xprt_udp:
bf0fd768 1432 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1433 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1434 break;
ee671b01
JL		 1435 case Opt_xprt_tcp6:
1436 protofamily = AF_INET6;
fdb66ff4 1437 case Opt_xprt_tcp:
bf0fd768 1438 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1439 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1440 break;
2cf7ff7a
TT		 1441 case Opt_xprt_rdma:
1442 /* vector side protocols to TCP */
1443 mnt->flags |= NFS_MOUNT_TCP;
1444 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1445 xprt_load_transport(string);
2cf7ff7a 1446 break;
bf0fd768 1447 default:
f45663ce
CL		 1448 dfprintk(MOUNT, "NFS: unrecognized "
1449 "transport protocol\n");
4223a4a1 1450 kfree(string);
d23c45fd 1451 return 0;
bf0fd768 1452 }
c5cb09b6 1453 kfree(string);
bf0fd768
CL		 1454 break;
1455 case Opt_mountproto:
1456 string = match_strdup(args);
1457 if (string == NULL)
1458 goto out_nomem;
1459 token = match_token(string,
1460 nfs_xprt_protocol_tokens, args);
d508afb4 1461 kfree(string);
bf0fd768 1462
ee671b01 1463 mountfamily = AF_INET;
bf0fd768 1464 switch (token) {
ee671b01
JL		 1465 case Opt_xprt_udp6:
1466 mountfamily = AF_INET6;
fdb66ff4 1467 case Opt_xprt_udp:
0896a725 1468 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1469 break;
ee671b01
JL		 1470 case Opt_xprt_tcp6:
1471 mountfamily = AF_INET6;
fdb66ff4 1472 case Opt_xprt_tcp:
0896a725 1473 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1474 break;
2cf7ff7a 1475 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1476 default:
f45663ce
CL		 1477 dfprintk(MOUNT, "NFS: unrecognized "
1478 "transport protocol\n");
d23c45fd 1479 return 0;
bf0fd768
CL		 1480 }
1481 break;
1482 case Opt_addr:
1483 string = match_strdup(args);
1484 if (string == NULL)
1485 goto out_nomem;
53a0b9c4 1486 mnt->nfs_server.addrlen =
b48e1278 1487 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1488 (struct sockaddr *)
1489 &mnt->nfs_server.address,
1490 sizeof(mnt->nfs_server.address));
bf0fd768 1491 kfree(string);
53a0b9c4
CL		 1492 if (mnt->nfs_server.addrlen == 0)
1493 goto out_invalid_address;
bf0fd768
CL		 1494 break;
1495 case Opt_clientaddr:
c5cb09b6 1496 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1497 goto out_nomem;
bf0fd768 1498 break;
33832034 1499 case Opt_mounthost:
c5cb09b6
RL		 1500 if (nfs_get_option_str(args,
1501 &mnt->mount_server.hostname))
33832034 1502 goto out_nomem;
33832034 1503 break;
0ac83779 1504 case Opt_mountaddr:
bf0fd768
CL		 1505 string = match_strdup(args);
1506 if (string == NULL)
1507 goto out_nomem;
53a0b9c4 1508 mnt->mount_server.addrlen =
b48e1278 1509 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1510 (struct sockaddr *)
1511 &mnt->mount_server.address,
1512 sizeof(mnt->mount_server.address));
bf0fd768 1513 kfree(string);
53a0b9c4
CL		 1514 if (mnt->mount_server.addrlen == 0)
1515 goto out_invalid_address;
bf0fd768 1516 break;
7973c1f1
TM		 1517 case Opt_lookupcache:
1518 string = match_strdup(args);
1519 if (string == NULL)
1520 goto out_nomem;
1521 token = match_token(string,
1522 nfs_lookupcache_tokens, args);
1523 kfree(string);
1524 switch (token) {
1525 case Opt_lookupcache_all:
1526 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1527 break;
1528 case Opt_lookupcache_positive:
1529 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1530 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1531 break;
1532 case Opt_lookupcache_none:
1533 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1534 break;
1535 default:
7973c1f1
TM		 1536 dfprintk(MOUNT, "NFS: invalid "
1537 "lookupcache argument\n");
d23c45fd 1538 return 0;
7973c1f1
TM		 1539 };
1540 break;
a6d5ff64 1541 case Opt_fscache_uniq:
c5cb09b6 1542 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1543 goto out_nomem;
a6d5ff64
CL		 1544 mnt->options |= NFS_OPTION_FSCACHE;
1545 break;
5eebde23
SJ		 1546 case Opt_local_lock:
1547 string = match_strdup(args);
1548 if (string == NULL)
1549 goto out_nomem;
1550 token = match_token(string, nfs_local_lock_tokens,
1551 args);
1552 kfree(string);
1553 switch (token) {
1554 case Opt_local_lock_all:
1555 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 case Opt_local_lock_flock:
1559 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1560 break;
1561 case Opt_local_lock_posix:
1562 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1563 break;
1564 case Opt_local_lock_none:
1565 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1566 NFS_MOUNT_LOCAL_FCNTL);
1567 break;
1568 default:
1569 dfprintk(MOUNT, "NFS: invalid "
1570 "local_lock argument\n");
1571 return 0;
1572 };
1573 break;
bf0fd768 1574
f45663ce
CL		 1575 /*
1576 * Special options
1577 */
1578 case Opt_sloppy:
1579 sloppy = 1;
1580 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1581 break;
bf0fd768
CL		 1582 case Opt_userspace:
1583 case Opt_deprecated:
d33e4dfe
CL		 1584 dfprintk(MOUNT, "NFS: ignoring mount option "
1585 "'%s'\n", p);
bf0fd768
CL		 1586 break;
1587
1588 default:
d23c45fd 1589 invalid_option = 1;
f45663ce
CL		 1590 dfprintk(MOUNT, "NFS: unrecognized mount option "
1591 "'%s'\n", p);
bf0fd768
CL		 1592 }
1593 }
1594
d23c45fd
CL		 1595 if (!sloppy && invalid_option)
1596 return 0;
1597
571b7554
WAA		 1598 if (mnt->minorversion && mnt->version != 4)
1599 goto out_minorversion_mismatch;
1600
89652617
CL		 1601 if (mnt->options & NFS_OPTION_MIGRATION &&
1602 mnt->version != 4 && mnt->minorversion != 0)
1603 goto out_migration_misuse;
1604
ee671b01
JL		 1605 /*
1606 * verify that any proto=/mountproto= options match the address
1856b225 1607 * families in the addr=/mountaddr= options.
ee671b01
JL		 1608 */
1609 if (protofamily != AF_UNSPEC &&
1610 protofamily != mnt->nfs_server.address.ss_family)
1611 goto out_proto_mismatch;
1612
1613 if (mountfamily != AF_UNSPEC) {
1614 if (mnt->mount_server.addrlen) {
1615 if (mountfamily != mnt->mount_server.address.ss_family)
1616 goto out_mountproto_mismatch;
1617 } else {
1618 if (mountfamily != mnt->nfs_server.address.ss_family)
1619 goto out_mountproto_mismatch;
1620 }
1621 }
1622
bf0fd768
CL		 1623 return 1;
1624
ee671b01
JL		 1625out_mountproto_mismatch:
1626 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1627 "option\n");
1628 return 0;
1629out_proto_mismatch:
1630 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1631 return 0;
53a0b9c4
CL		 1632out_invalid_address:
1633 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1634 return 0;
d23c45fd 1635out_invalid_value:
53a0b9c4 1636 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1637 return 0;
571b7554
WAA		 1638out_minorversion_mismatch:
1639 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1640 "minorversion=%u\n", mnt->version, mnt->minorversion);
1641 return 0;
89652617
CL		 1642out_migration_misuse:
1643 printk(KERN_INFO
1644 "NFS: 'migration' not supported for this NFS version\n");
1645 return 0;
bf0fd768
CL		 1646out_nomem:
1647 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1648 return 0;
f9c3a380
EP		 1649out_security_failure:
1650 free_secdata(secdata);
1651 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1652 return 0;
bf0fd768
CL		 1653}
1654
ec88f28d
CL		 1655/*
1656 * Match the requested auth flavors with the list returned by
1657 * the server. Returns zero and sets the mount's authentication
1658 * flavor on success; returns -EACCES if server does not support
1659 * the requested flavor.
1660 */
1661static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1662 struct nfs_mount_request *request)
1663{
1664 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1665
5eecfde6
CL		 1666 /*
1667 * Certain releases of Linux's mountd return an empty
1668 * flavor list. To prevent behavioral regression with
1669 * these servers (ie. rejecting mounts that used to
1670 * succeed), revert to pre-2.6.32 behavior (no checking)
1671 * if the returned flavor list is empty.
1672 */
1673 if (server_authlist_len == 0)
1674 return 0;
1675
ec88f28d
CL		 1676 /*
1677 * We avoid sophisticated negotiating here, as there are
1678 * plenty of cases where we can get it wrong, providing
1679 * either too little or too much security.
1680 *
1681 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1682 * flavor listed first. However, some servers list
1683 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1684 * preferred default, in args->auth_flavors[0] if user
1685 * didn't specify sec= mount option.
1686 */
1687 for (i = 0; i < args->auth_flavor_len; i++)
1688 for (j = 0; j < server_authlist_len; j++)
1689 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1690 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1691 request->auth_flavs[j]);
1692 args->auth_flavors[0] = request->auth_flavs[j];
1693 return 0;
1694 }
1695
1696 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1697 nfs_umount(request);
1698 return -EACCES;
1699}
1700
0076d7b7
CL		 1701/*
1702 * Use the remote server's MOUNT service to request the NFS file handle
1703 * corresponding to the provided path.
1704 */
486aa699
BS		 1705static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1706 struct nfs_fh *root_fh)
0076d7b7 1707{
ec88f28d
CL		 1708 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1709 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1710 struct nfs_mount_request request = {
1711 .sap = (struct sockaddr *)
1712 &args->mount_server.address,
1713 .dirpath = args->nfs_server.export_path,
1714 .protocol = args->mount_server.protocol,
1715 .fh = root_fh,
50a737f8 1716 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1717 .auth_flav_len = &server_authlist_len,
1718 .auth_flavs = server_authlist,
6d59b8d5 1719 .net = args->net,
c5d120f8 1720 };
4c568017 1721 int status;
0076d7b7
CL		 1722
1723 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1724 switch (args->version) {
1725 default:
1726 args->mount_server.version = NFS_MNT3_VERSION;
1727 break;
1728 case 2:
1729 args->mount_server.version = NFS_MNT_VERSION;
1730 }
0076d7b7 1731 }
c5d120f8 1732 request.version = args->mount_server.version;
0076d7b7 1733
33832034 1734 if (args->mount_server.hostname)
c5d120f8 1735 request.hostname = args->mount_server.hostname;
33832034 1736 else
c5d120f8 1737 request.hostname = args->nfs_server.hostname;
33832034 1738
0076d7b7
CL		 1739 /*
1740 * Construct the mount server's address.
1741 */
4c568017 1742 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1743 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1744 args->nfs_server.addrlen);
1745 args->mount_server.addrlen = args->nfs_server.addrlen;
1746 }
c5d120f8 1747 request.salen = args->mount_server.addrlen;
f5855fec 1748 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1749
1750 /*
1751 * Now ask the mount server to map our export path
1752 * to a file handle.
1753 */
c5d120f8 1754 status = nfs_mount(&request);
ec88f28d
CL		 1755 if (status != 0) {
1756 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1757 request.hostname, status);
1758 return status;
1759 }
0076d7b7 1760
ec88f28d
CL		 1761 /*
1762 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1763 */
1764 if (args->mount_server.version != NFS_MNT3_VERSION)
1765 return 0;
1766 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1767}
1768
ff9099f2
BS		 1769struct dentry *nfs_try_mount(int flags, const char *dev_name,
1770 struct nfs_mount_info *mount_info,
1771 struct nfs_subversion *nfs_mod)
486aa699
BS		 1772{
1773 int status;
1774 struct nfs_server *server;
1775
b72e4f42 1776 if (mount_info->parsed->need_mount) {
87c7083d 1777 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1778 if (status)
1779 return ERR_PTR(status);
1780 }
486aa699
BS		 1781
1782 /* Get a volume representation */
1179acc6 1783 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699
BS		 1784 if (IS_ERR(server))
1785 return ERR_CAST(server);
1786
ab7017a3 1787 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1788}
ddda8e0a 1789EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1790
c12bacec
RL		 1791/*
1792 * Split "dev_name" into "hostname:export_path".
1793 *
1794 * The leftmost colon demarks the split between the server's hostname
1795 * and the export path. If the hostname starts with a left square
1796 * bracket, then it may contain colons.
1797 *
1798 * Note: caller frees hostname and export path, even on error.
1799 */
1800static int nfs_parse_devname(const char *dev_name,
1801 char **hostname, size_t maxnamlen,
1802 char **export_path, size_t maxpathlen)
dc045898
CL		 1803{
1804 size_t len;
c12bacec 1805 char *end;
dc045898 1806
c12bacec
RL		 1807 /* Is the host name protected with square brakcets? */
1808 if (*dev_name == '[') {
1809 end = strchr(++dev_name, ']');
1810 if (end == NULL || end[1] != ':')
dc045898 1811 goto out_bad_devname;
dc045898 1812
c12bacec
RL		 1813 len = end - dev_name;
1814 end++;
1815 } else {
1816 char *comma;
dc045898 1817
c12bacec
RL		 1818 end = strchr(dev_name, ':');
1819 if (end == NULL)
1820 goto out_bad_devname;
1821 len = end - dev_name;
d1aa0825 1822
c12bacec
RL		 1823 /* kill possible hostname list: not supported */
1824 comma = strchr(dev_name, ',');
1825 if (comma != NULL && comma < end)
1826 *comma = 0;
1827 }
d1aa0825 1828
d1aa0825
CL		 1829 if (len > maxnamlen)
1830 goto out_hostname;
1831
1832 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1833 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1834 if (*hostname == NULL)
1835 goto out_nomem;
c12bacec 1836 len = strlen(++end);
d1aa0825
CL		 1837 if (len > maxpathlen)
1838 goto out_path;
1839 *export_path = kstrndup(end, len, GFP_KERNEL);
1840 if (!*export_path)
1841 goto out_nomem;
1842
c12bacec 1843 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1844 return 0;
1845
1846out_bad_devname:
1847 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1848 return -EINVAL;
1849
1850out_nomem:
1851 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1852 return -ENOMEM;
1853
1854out_hostname:
1855 dfprintk(MOUNT, "NFS: server hostname too long\n");
1856 return -ENAMETOOLONG;
1857
1858out_path:
1859 dfprintk(MOUNT, "NFS: export pathname too long\n");
1860 return -ENAMETOOLONG;
1861}
1862
f7b422b1 1863/*
54ceac45
DH		 1864 * Validate the NFS2/NFS3 mount data
1865 * - fills in the mount root filehandle
136d558c
CL		 1866 *
1867 * For option strings, user space handles the following behaviors:
1868 *
1869 * + DNS: mapping server host name to IP address ("addr=" option)
1870 *
1871 * + failure mode: how to behave if a mount request can't be handled
1872 * immediately ("fg/bg" option)
1873 *
1874 * + retry: how often to retry a mount request ("retry=" option)
1875 *
1876 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1877 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1878 */
d72c727c
BS		 1879static int nfs23_validate_mount_data(void *options,
1880 struct nfs_parsed_mount_data *args,
1881 struct nfs_fh *mntfh,
1882 const char *dev_name)
f7b422b1 1883{
2283f8d6 1884 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1885 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1886
5df36e78
CL		 1887 if (data == NULL)
1888 goto out_no_data;
f7b422b1 1889
c5afc8da 1890 args->version = NFS_DEFAULT_VERSION;
54ceac45 1891 switch (data->version) {
5df36e78
CL		 1892 case 1:
1893 data->namlen = 0;
1894 case 2:
1895 data->bsize = 0;
1896 case 3:
1897 if (data->flags & NFS_MOUNT_VER3)
1898 goto out_no_v3;
1899 data->root.size = NFS2_FHSIZE;
1900 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1901 case 4:
1902 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1903 goto out_no_sec;
1904 case 5:
1905 memset(data->context, 0, sizeof(data->context));
1906 case 6:
b7e24457
TM		 1907 if (data->flags & NFS_MOUNT_VER3) {
1908 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1909 goto out_invalid_fh;
5df36e78 1910 mntfh->size = data->root.size;
764302cc
CL		 1911 args->version = 3;
1912 } else {
5df36e78 1913 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1914 args->version = 2;
1915 }
5df36e78 1916
5df36e78
CL		 1917
1918 memcpy(mntfh->data, data->root.data, mntfh->size);
1919 if (mntfh->size < sizeof(mntfh->data))
1920 memset(mntfh->data + mntfh->size, 0,
1921 sizeof(mntfh->data) - mntfh->size);
6e88e061 1922
2283f8d6
TT		 1923 /*
1924 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1925 * can deal with.
1926 */
ff3525a5 1927 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1928 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1929 args->rsize = data->rsize;
1930 args->wsize = data->wsize;
2283f8d6
TT		 1931 args->timeo = data->timeo;
1932 args->retrans = data->retrans;
1933 args->acregmin = data->acregmin;
1934 args->acregmax = data->acregmax;
1935 args->acdirmin = data->acdirmin;
1936 args->acdirmax = data->acdirmax;
b72e4f42 1937 args->need_mount = false;
4c568017 1938
4cfd74fc 1939 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1940 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 1941 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 1942 if (!nfs_verify_server_address(sap))
4c568017
CL		 1943 goto out_no_address;
1944
2283f8d6 1945 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1946 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1947 /* N.B. caller will free nfs_server.hostname in all cases */
1948 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1949 args->namlen = data->namlen;
1950 args->bsize = data->bsize;
dd07c947
CL		 1951
1952 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1953 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1954 if (!args->nfs_server.hostname)
1955 goto out_nomem;
f9c3a380 1956
5eebde23
SJ		 1957 if (!(data->flags & NFS_MOUNT_NONLM))
1958 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1959 NFS_MOUNT_LOCAL_FCNTL);
1960 else
1961 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1962 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1963 /*
1964 * The legacy version 6 binary mount data from userspace has a
1965 * field used only to transport selinux information into the
1966 * the kernel. To continue to support that functionality we
1967 * have a touch of selinux knowledge here in the NFS code. The
1968 * userspace code converted context=blah to just blah so we are
1969 * converting back to the full string selinux understands.
1970 */
1971 if (data->context[0]){
1972#ifdef CONFIG_SECURITY_SELINUX
1973 int rc;
1974 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1975 if (!opts_str)
1976 return -ENOMEM;
1977 strcpy(opts_str, "context=");
1978 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1979 strcat(opts_str, &data->context[0]);
1980 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1981 kfree(opts_str);
1982 if (rc)
1983 return rc;
1984#else
1985 return -EINVAL;
1986#endif
1987 }
1988
5df36e78 1989 break;
b72e4f42
BS		 1990 default:
1991 return NFS_TEXT_DATA;
f7b422b1 1992 }
54ceac45 1993
1c606fb7 1994#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 1995 if (args->version == 3)
5df36e78
CL		 1996 goto out_v3_not_compiled;
1997#endif /* !CONFIG_NFS_V3 */
f7b422b1 1998
5df36e78 1999 return 0;
f7b422b1 2000
5df36e78
CL		 2001out_no_data:
2002 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2003 return -EINVAL;
54ceac45 2004
5df36e78
CL		 2005out_no_v3:
2006 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2007 data->version);
2008 return -EINVAL;
f7b422b1 2009
5df36e78
CL		 2010out_no_sec:
2011 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2012 return -EINVAL;
2013
1c606fb7 2014#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 2015out_v3_not_compiled:
2016 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2017 return -EPROTONOSUPPORT;
2018#endif /* !CONFIG_NFS_V3 */
2019
63649bd7
CG		 2020out_nomem:
2021 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2022 return -ENOMEM;
2023
5df36e78
CL		 2024out_no_address:
2025 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2026 return -EINVAL;
2027
2028out_invalid_fh:
2029 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2030 return -EINVAL;
f7b422b1
DH		 2031}
2032
89d77c8f 2033#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 2034static int nfs_validate_mount_data(struct file_system_type *fs_type,
2035 void *options,
2036 struct nfs_parsed_mount_data *args,
2037 struct nfs_fh *mntfh,
2038 const char *dev_name)
2039{
2040 if (fs_type == &nfs_fs_type)
2041 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2042 return nfs4_validate_mount_data(options, args, dev_name);
2043}
2044#else
2045static int nfs_validate_mount_data(struct file_system_type *fs_type,
2046 void *options,
2047 struct nfs_parsed_mount_data *args,
2048 struct nfs_fh *mntfh,
2049 const char *dev_name)
2050{
2051 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2052}
2053#endif
2054
b72e4f42
BS		 2055static int nfs_validate_text_mount_data(void *options,
2056 struct nfs_parsed_mount_data *args,
2057 const char *dev_name)
2058{
2059 int port = 0;
2060 int max_namelen = PAGE_SIZE;
2061 int max_pathlen = NFS_MAXPATHLEN;
2062 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2063
2064 if (nfs_parse_mount_options((char *)options, args) == 0)
2065 return -EINVAL;
2066
2067 if (!nfs_verify_server_address(sap))
2068 goto out_no_address;
2069
2070 if (args->version == 4) {
89d77c8f 2071#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2072 port = NFS_PORT;
2073 max_namelen = NFS4_MAXNAMLEN;
2074 max_pathlen = NFS4_MAXPATHLEN;
2075 nfs_validate_transport_protocol(args);
2076 nfs4_validate_mount_flags(args);
2077#else
2078 goto out_v4_not_compiled;
2079#endif /* CONFIG_NFS_V4 */
2080 } else
2081 nfs_set_mount_transport_protocol(args);
2082
2083 nfs_set_port(sap, &args->nfs_server.port, port);
2084
2085 if (args->auth_flavor_len > 1)
2086 goto out_bad_auth;
2087
2088 return nfs_parse_devname(dev_name,
2089 &args->nfs_server.hostname,
2090 max_namelen,
2091 &args->nfs_server.export_path,
2092 max_pathlen);
2093
89d77c8f 2094#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2095out_v4_not_compiled:
2096 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2097 return -EPROTONOSUPPORT;
2098#endif /* !CONFIG_NFS_V4 */
2099
2100out_no_address:
2101 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2102 return -EINVAL;
2103
2104out_bad_auth:
2105 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2106 return -EINVAL;
2107}
2108
48b605f8
JL		 2109static int
2110nfs_compare_remount_data(struct nfs_server *nfss,
2111 struct nfs_parsed_mount_data *data)
2112{
2113 if (data->flags != nfss->flags ||
2114 data->rsize != nfss->rsize ||
2115 data->wsize != nfss->wsize ||
2116 data->retrans != nfss->client->cl_timeout->to_retries ||
2117 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2118 data->acregmin != nfss->acregmin / HZ ||
2119 data->acregmax != nfss->acregmax / HZ ||
2120 data->acdirmin != nfss->acdirmin / HZ ||
2121 data->acdirmax != nfss->acdirmax / HZ ||
2122 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2123 data->nfs_server.port != nfss->port ||
48b605f8 2124 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2125 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2126 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2127 return -EINVAL;
2128
2129 return 0;
2130}
2131
fbdefd64 2132int
48b605f8
JL		 2133nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2134{
2135 int error;
2136 struct nfs_server *nfss = sb->s_fs_info;
2137 struct nfs_parsed_mount_data *data;
2138 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2139 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2140 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2141
2142 /*
2143 * Userspace mount programs that send binary options generally send
2144 * them populated with default values. We have no way to know which
2145 * ones were explicitly specified. Fall back to legacy behavior and
2146 * just return success.
2147 */
31c94469
MZ		 2148 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2149 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2150 options->version <= 6))))
48b605f8
JL		 2151 return 0;
2152
2153 data = kzalloc(sizeof(*data), GFP_KERNEL);
2154 if (data == NULL)
2155 return -ENOMEM;
2156
2157 /* fill out struct with values from existing mount */
2158 data->flags = nfss->flags;
2159 data->rsize = nfss->rsize;
2160 data->wsize = nfss->wsize;
2161 data->retrans = nfss->client->cl_timeout->to_retries;
2162 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2163 data->acregmin = nfss->acregmin / HZ;
2164 data->acregmax = nfss->acregmax / HZ;
2165 data->acdirmin = nfss->acdirmin / HZ;
2166 data->acdirmax = nfss->acdirmax / HZ;
2167 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2168 data->nfs_server.port = nfss->port;
48b605f8
JL		 2169 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2170 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2171 data->nfs_server.addrlen);
2172
2173 /* overwrite those values with any that were specified */
2174 error = nfs_parse_mount_options((char *)options, data);
2175 if (error < 0)
2176 goto out;
2177
26c4c170
JL		 2178 /*
2179 * noac is a special case. It implies -o sync, but that's not
2180 * necessarily reflected in the mtab options. do_remount_sb
2181 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2182 * remount options, so we have to explicitly reset it.
2183 */
2184 if (data->flags & NFS_MOUNT_NOAC)
2185 *flags |= MS_SYNCHRONOUS;
2186
48b605f8
JL		 2187 /* compare new mount options with old ones */
2188 error = nfs_compare_remount_data(nfss, data);
2189out:
2190 kfree(data);
2191 return error;
2192}
89d77c8f 2193EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2194
f7b422b1 2195/*
54ceac45 2196 * Initialise the common bits of the superblock
f7b422b1 2197 */
fbdefd64 2198inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2199{
54ceac45 2200 struct nfs_server *server = NFS_SB(sb);
5006a76c 2201
54ceac45 2202 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2203
54ceac45
DH		 2204 /* We probably want something more informative here */
2205 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2206 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2207
54ceac45
DH		 2208 if (sb->s_blocksize == 0)
2209 sb->s_blocksize = nfs_block_bits(server->wsize,
2210 &sb->s_blocksize_bits);
f7b422b1 2211
32a88aa1
JA		 2212 sb->s_bdi = &server->backing_dev_info;
2213
54ceac45 2214 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2215}
2216
2217/*
54ceac45 2218 * Finish setting up an NFS2/3 superblock
f7b422b1 2219 */
fbdefd64 2220void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2221{
c40f8d1d 2222 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2223 struct nfs_server *server = NFS_SB(sb);
5006a76c 2224
54ceac45
DH		 2225 sb->s_blocksize_bits = 0;
2226 sb->s_blocksize = 0;
6a74490d
BS		 2227 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2228 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2229 if (data && data->bsize)
54ceac45 2230 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2231
6a74490d 2232 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2233 /* The VFS shouldn't apply the umask to mode bits. We will do
2234 * so ourselves when necessary.
2235 */
2236 sb->s_flags |= MS_POSIXACL;
2237 sb->s_time_gran = 1;
816724e6 2238 }
54ceac45 2239
54ceac45 2240 nfs_initialise_sb(sb);
f7b422b1 2241}
89d77c8f 2242EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2243
2244/*
3cadf4b8 2245 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2246 */
fbdefd64 2247void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2248{
8c958e0c 2249 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2250 struct nfs_server *server = NFS_SB(sb);
2251
2252 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2253 sb->s_blocksize = old_sb->s_blocksize;
2254 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2255 sb->s_xattr = old_sb->s_xattr;
2256 sb->s_op = old_sb->s_op;
2257 sb->s_time_gran = 1;
f7b422b1 2258
3cadf4b8 2259 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2260 /* The VFS shouldn't apply the umask to mode bits. We will do
2261 * so ourselves when necessary.
f7b422b1
DH		 2262 */
2263 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2264 }
2265
54ceac45 2266 nfs_initialise_sb(sb);
f7b422b1
DH		 2267}
2268
275a5d24
TM		 2269static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2270{
2271 const struct nfs_server *a = s->s_fs_info;
2272 const struct rpc_clnt *clnt_a = a->client;
2273 const struct rpc_clnt *clnt_b = b->client;
2274
2275 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2276 goto Ebusy;
2277 if (a->nfs_client != b->nfs_client)
2278 goto Ebusy;
2279 if (a->flags != b->flags)
2280 goto Ebusy;
2281 if (a->wsize != b->wsize)
2282 goto Ebusy;
2283 if (a->rsize != b->rsize)
2284 goto Ebusy;
2285 if (a->acregmin != b->acregmin)
2286 goto Ebusy;
2287 if (a->acregmax != b->acregmax)
2288 goto Ebusy;
2289 if (a->acdirmin != b->acdirmin)
2290 goto Ebusy;
2291 if (a->acdirmax != b->acdirmax)
2292 goto Ebusy;
2293 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2294 goto Ebusy;
e89a5a43 2295 return 1;
275a5d24 2296Ebusy:
e89a5a43
TM		 2297 return 0;
2298}
2299
2300struct nfs_sb_mountdata {
2301 struct nfs_server *server;
2302 int mntflags;
2303};
2304
2305static int nfs_set_super(struct super_block *s, void *data)
2306{
2307 struct nfs_sb_mountdata *sb_mntdata = data;
2308 struct nfs_server *server = sb_mntdata->server;
2309 int ret;
2310
2311 s->s_flags = sb_mntdata->mntflags;
2312 s->s_fs_info = server;
8b244ff2 2313 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2314 ret = set_anon_super(s, server);
2315 if (ret == 0)
2316 server->s_dev = s->s_dev;
2317 return ret;
2318}
2319
fd00a8ff
CL		 2320static int nfs_compare_super_address(struct nfs_server *server1,
2321 struct nfs_server *server2)
2322{
2323 struct sockaddr *sap1, *sap2;
2324
2325 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2326 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2327
2328 if (sap1->sa_family != sap2->sa_family)
2329 return 0;
2330
2331 switch (sap1->sa_family) {
2332 case AF_INET: {
2333 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2334 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2335 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2336 return 0;
2337 if (sin1->sin_port != sin2->sin_port)
2338 return 0;
2339 break;
2340 }
2341 case AF_INET6: {
2342 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2343 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2344 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2345 return 0;
2346 if (sin1->sin6_port != sin2->sin6_port)
2347 return 0;
2348 break;
2349 }
2350 default:
2351 return 0;
2352 }
2353
2354 return 1;
2355}
2356
e89a5a43
TM		 2357static int nfs_compare_super(struct super_block *sb, void *data)
2358{
2359 struct nfs_sb_mountdata *sb_mntdata = data;
2360 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2361 int mntflags = sb_mntdata->mntflags;
2362
fd00a8ff 2363 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2364 return 0;
2365 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2366 if (old->flags & NFS_MOUNT_UNSHARED)
2367 return 0;
2368 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2369 return 0;
2370 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2371}
2372
39ffb921 2373#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2374static void nfs_get_cache_cookie(struct super_block *sb,
2375 struct nfs_parsed_mount_data *parsed,
2376 struct nfs_clone_mount *cloned)
2377{
c4271c6e 2378 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2379 char *uniq = NULL;
2380 int ulen = 0;
2381
c4271c6e
TM		 2382 nfss->fscache_key = NULL;
2383 nfss->fscache = NULL;
2384
2385 if (parsed) {
2386 if (!(parsed->options & NFS_OPTION_FSCACHE))
2387 return;
2388 if (parsed->fscache_uniq) {
2389 uniq = parsed->fscache_uniq;
2390 ulen = strlen(parsed->fscache_uniq);
2391 }
2311b943
BS		 2392 } else if (cloned) {
2393 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2394 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2395 return;
2311b943
BS		 2396 if (mnt_s->fscache_key) {
2397 uniq = mnt_s->fscache_key->key.uniquifier;
2398 ulen = mnt_s->fscache_key->key.uniq_len;
2399 };
c4271c6e
TM		 2400 } else
2401 return;
2311b943
BS		 2402
2403 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2404}
39ffb921
TM		 2405#else
2406static void nfs_get_cache_cookie(struct super_block *sb,
2407 struct nfs_parsed_mount_data *parsed,
2408 struct nfs_clone_mount *cloned)
2409{
2410}
2411#endif
2311b943 2412
fa799759
MS		 2413static int nfs_bdi_register(struct nfs_server *server)
2414{
2415 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2416}
2417
fbdefd64
BS		 2418int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2419 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2420{
2421 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2422}
89d77c8f 2423EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2424
fbdefd64
BS		 2425int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2426 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2427{
2428 /* clone any lsm security options from the parent to the new sb */
2429 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2430 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2431 return -ESTALE;
2432 return 0;
2433}
89d77c8f 2434EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2435
ab7017a3 2436struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2437 int flags, const char *dev_name,
ab7017a3
BS		 2438 struct nfs_mount_info *mount_info,
2439 struct nfs_subversion *nfs_mod)
f7b422b1 2440{
f7b422b1 2441 struct super_block *s;
01194981 2442 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2444 struct nfs_sb_mountdata sb_mntdata = {
2445 .mntflags = flags,
c40f8d1d 2446 .server = server,
e89a5a43 2447 };
01194981 2448 int error;
33852a1f 2449
75180df2
TM		 2450 if (server->flags & NFS_MOUNT_UNSHARED)
2451 compare_super = NULL;
2452
fb2088cc
SP		 2453 /* -o noac implies -o sync */
2454 if (server->flags & NFS_MOUNT_NOAC)
2455 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2456
54ceac45 2457 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2458 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2459 if (IS_ERR(s)) {
01194981 2460 mntroot = ERR_CAST(s);
54ceac45 2461 goto out_err_nosb;
816724e6
TM		 2462 }
2463
54ceac45
DH		 2464 if (s->s_fs_info != server) {
2465 nfs_free_server(server);
2466 server = NULL;
fa799759
MS		 2467 } else {
2468 error = nfs_bdi_register(server);
01194981
AV		 2469 if (error) {
2470 mntroot = ERR_PTR(error);
cfbc0683 2471 goto error_splat_bdi;
01194981 2472 }
54ceac45 2473 }
f7b422b1 2474
54ceac45
DH		 2475 if (!s->s_root) {
2476 /* initial superblock/root creation */
c40f8d1d 2477 mount_info->fill_super(s, mount_info);
3d176e3f 2478 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2479 }
f7b422b1 2480
87c7083d 2481 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2482 if (IS_ERR(mntroot))
54ceac45 2483 goto error_splat_super;
816724e6 2484
3d176e3f 2485 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2486 if (error)
2487 goto error_splat_root;
2488
54ceac45 2489 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2490
2491out:
01194981 2492 return mntroot;
816724e6 2493
54ceac45
DH		 2494out_err_nosb:
2495 nfs_free_server(server);
0655960f 2496 goto out;
54ceac45 2497
f9c3a380
EP		 2498error_splat_root:
2499 dput(mntroot);
01194981 2500 mntroot = ERR_PTR(error);
54ceac45 2501error_splat_super:
cfbc0683
N		 2502 if (server && !s->s_root)
2503 bdi_unregister(&server->backing_dev_info);
2504error_splat_bdi:
6f5bbff9 2505 deactivate_locked_super(s);
0655960f 2506 goto out;
f7b422b1 2507}
89d77c8f 2508EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2509
fbdefd64 2510struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2511 int flags, const char *dev_name, void *raw_data)
2512{
c40f8d1d
BS		 2513 struct nfs_mount_info mount_info = {
2514 .fill_super = nfs_fill_super,
3d176e3f 2515 .set_security = nfs_set_sb_security,
c40f8d1d 2516 };
c40f8d1d 2517 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2518 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2519 int error;
2520
46058d46 2521 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2522 mount_info.mntfh = nfs_alloc_fhandle();
2523 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2524 goto out;
2525
2526 /* Validate the mount data */
87c7083d 2527 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2528 if (error == NFS_TEXT_DATA)
46058d46 2529 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2530 if (error < 0) {
2531 mntroot = ERR_PTR(error);
2532 goto out;
2533 }
c40f8d1d 2534
ab7017a3
BS		 2535 nfs_mod = get_nfs_version(mount_info.parsed->version);
2536 if (IS_ERR(nfs_mod)) {
2537 mntroot = ERR_CAST(nfs_mod);
2538 goto out;
2539 }
2540
ff9099f2 2541 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2542
2543 put_nfs_version(nfs_mod);
c40f8d1d 2544out:
46058d46 2545 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2546 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2547 return mntroot;
2548}
89d77c8f 2549EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2550
387c149b
TM		 2551/*
2552 * Ensure that we unregister the bdi before kill_anon_super
2553 * releases the device name
2554 */
fbdefd64 2555void nfs_put_super(struct super_block *s)
387c149b
TM		 2556{
2557 struct nfs_server *server = NFS_SB(s);
2558
2559 bdi_unregister(&server->backing_dev_info);
2560}
89d77c8f 2561EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2562
54ceac45
DH		 2563/*
2564 * Destroy an NFS2/3 superblock
2565 */
fbdefd64 2566void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2567{
2568 struct nfs_server *server = NFS_SB(s);
2569
2570 kill_anon_super(s);
08734048 2571 nfs_fscache_release_super_cookie(s);
54ceac45 2572 nfs_free_server(server);
f7b422b1 2573}
89d77c8f 2574EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2575
54ceac45 2576/*
8c958e0c 2577 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2578 */
3dd4f8ef 2579static struct dentry *
e8f25e6d
BS		 2580nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2581 const char *dev_name, void *raw_data)
f7b422b1 2582{
e8f25e6d
BS		 2583 struct nfs_clone_mount *data = raw_data;
2584 struct nfs_mount_info mount_info = {
2585 .fill_super = nfs_clone_super,
2586 .set_security = nfs_clone_sb_security,
2587 .cloned = data,
2588 };
54ceac45 2589 struct nfs_server *server;
3d176e3f 2590 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2591 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
54ceac45 2592 int error;
f7b422b1 2593
8c958e0c 2594 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2595
e8f25e6d 2596 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2597
54ceac45 2598 /* create a new volume representation */
1179acc6 2599 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2600 if (IS_ERR(server)) {
2601 error = PTR_ERR(server);
3d176e3f 2602 goto out_err;
4c1fe2f7 2603 }
f7b422b1 2604
e8f25e6d 2605 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
8c958e0c 2606 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2607out:
31f43471 2608 return mntroot;
24c8dbbb 2609
3d176e3f 2610out_err:
8c958e0c 2611 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2612 goto out;
f7b422b1
DH		 2613}
2614
89d77c8f 2615#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2616
01c3f052
TM		 2617static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2618{
5eebde23
SJ		 2619 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2620 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2621}
2622
f0768ebd
CL		 2623/*
2624 * Validate NFSv4 mount options
2625 */
91ea40b9
TT		 2626static int nfs4_validate_mount_data(void *options,
2627 struct nfs_parsed_mount_data *args,
2628 const char *dev_name)
f0768ebd 2629{
4cfd74fc 2630 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2631 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2632 char *c;
2633
2634 if (data == NULL)
2635 goto out_no_data;
2636
cdf66442
BS		 2637 args->version = 4;
2638
f0768ebd
CL		 2639 switch (data->version) {
2640 case 1:
4c568017
CL		 2641 if (data->host_addrlen > sizeof(args->nfs_server.address))
2642 goto out_no_address;
2643 if (data->host_addrlen == 0)
f0768ebd 2644 goto out_no_address;
4c568017 2645 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2646 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2647 return -EFAULT;
4cfd74fc 2648 if (!nfs_verify_server_address(sap))
f0768ebd 2649 goto out_no_address;
872ece86 2650 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2651
6738b251
CL		 2652 if (data->auth_flavourlen) {
2653 if (data->auth_flavourlen > 1)
2654 goto out_inval_auth;
20c71f5e 2655 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2656 data->auth_flavours,
20c71f5e 2657 sizeof(args->auth_flavors[0])))
f0768ebd 2658 return -EFAULT;
f0768ebd
CL		 2659 }
2660
2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
91ea40b9 2664 args->nfs_server.hostname = c;
f0768ebd
CL		 2665
2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
91ea40b9
TT		 2669 args->nfs_server.export_path = c;
2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2671
2672 c = strndup_user(data->client_addr.data, 16);
2673 if (IS_ERR(c))
2674 return PTR_ERR(c);
91ea40b9
TT		 2675 args->client_address = c;
2676
2677 /*
2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2679 * can deal with.
2680 */
2681
2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2683 args->rsize = data->rsize;
2684 args->wsize = data->wsize;
2685 args->timeo = data->timeo;
2686 args->retrans = data->retrans;
2687 args->acregmin = data->acregmin;
2688 args->acregmax = data->acregmax;
2689 args->acdirmin = data->acdirmin;
2690 args->acdirmax = data->acdirmax;
2691 args->nfs_server.protocol = data->proto;
259875ef 2692 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2693
2694 break;
7630c852 2695 default:
b72e4f42 2696 return NFS_TEXT_DATA;
f0768ebd
CL		 2697 }
2698
2699 return 0;
2700
2701out_no_data:
2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2703 return -EINVAL;
2704
2705out_inval_auth:
2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2707 data->auth_flavourlen);
2708 return -EINVAL;
2709
2710out_no_address:
2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2712 return -EINVAL;
f0768ebd
CL		 2713}
2714
fac1e8e4
BS		 2715/*
2716 * NFS v4 module parameters need to stay in the
2717 * NFS client for backwards compatibility
2718 */
2719unsigned int nfs_callback_set_tcpport;
2720unsigned short nfs_callback_tcpport;
2721/* Default cache timeout is 10 minutes */
2722unsigned int nfs_idmap_cache_timeout = 600;
2723/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2724bool nfs4_disable_idmapping = true;
2725unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2726unsigned short send_implementation_id = 1;
6f2ea7f2 2727char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
fac1e8e4 2728
89d77c8f
BS		 2729EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2730EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2731EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2732EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2733EXPORT_SYMBOL_GPL(max_session_slots);
2734EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2735EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
89d77c8f 2736
fac1e8e4
BS		 2737#define NFS_CALLBACK_MAXPORTNR (65535U)
2738
2739static int param_set_portnr(const char *val, const struct kernel_param *kp)
2740{
2741 unsigned long num;
2742 int ret;
2743
2744 if (!val)
2745 return -EINVAL;
7297cb68 2746 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2747 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2748 return -EINVAL;
2749 *((unsigned int *)kp->arg) = num;
2750 return 0;
2751}
2752static struct kernel_param_ops param_ops_portnr = {
2753 .set = param_set_portnr,
2754 .get = param_get_uint,
2755};
2756#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2757
2758module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2759module_param(nfs_idmap_cache_timeout, int, 0644);
2760module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2761module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2762 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2763MODULE_PARM_DESC(nfs4_disable_idmapping,
2764 "Turn off NFSv4 idmapping when using 'sec=sys'");
2765module_param(max_session_slots, ushort, 0644);
2766MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2767 "requests the client will negotiate");
2768module_param(send_implementation_id, ushort, 0644);
2769MODULE_PARM_DESC(send_implementation_id,
2770 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2771MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2772MODULE_ALIAS("nfs4");
2773
54ceac45 2774#endif /* CONFIG_NFS_V4 */
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