projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
NFS: Fix a regression when loading the NFS v4 module
[linux-block.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>
f7b422b1 57
f7b422b1
DH		 58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
ab7017a3 67#include "nfs.h"
f7b422b1
DH		 68
69#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 70#define NFS_TEXT_DATA 1
f7b422b1 71
1c606fb7 72#if IS_ENABLED(CONFIG_NFS_V3)
1e657bd5
PZ		 73#define NFS_DEFAULT_VERSION 3
74#else
75#define NFS_DEFAULT_VERSION 2
76#endif
77
bf0fd768
CL		 78enum {
79 /* Mount options that take no arguments */
80 Opt_soft, Opt_hard,
bf0fd768
CL		 81 Opt_posix, Opt_noposix,
82 Opt_cto, Opt_nocto,
83 Opt_ac, Opt_noac,
84 Opt_lock, Opt_nolock,
2cf7ff7a 85 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 86 Opt_acl, Opt_noacl,
87 Opt_rdirplus, Opt_nordirplus,
75180df2 88 Opt_sharecache, Opt_nosharecache,
d740351b 89 Opt_resvport, Opt_noresvport,
b797cac7 90 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 91
92 /* Mount options that take integer arguments */
93 Opt_port,
94 Opt_rsize, Opt_wsize, Opt_bsize,
95 Opt_timeo, Opt_retrans,
96 Opt_acregmin, Opt_acregmax,
97 Opt_acdirmin, Opt_acdirmax,
98 Opt_actimeo,
99 Opt_namelen,
100 Opt_mountport,
e887cbcf 101 Opt_mountvers,
3fd5be9e 102 Opt_minorversion,
bf0fd768
CL		 103
104 /* Mount options that take string arguments */
0d71b058 105 Opt_nfsvers,
33832034 106 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 107 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 108 Opt_lookupcache,
b797cac7 109 Opt_fscache_uniq,
5eebde23 110 Opt_local_lock,
bf0fd768 111
f45663ce
CL		 112 /* Special mount options */
113 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 114
115 Opt_err
116};
117
a447c093 118static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 119 { Opt_userspace, "bg" },
120 { Opt_userspace, "fg" },
ecbb3845
CL		 121 { Opt_userspace, "retry=%s" },
122
f45663ce
CL		 123 { Opt_sloppy, "sloppy" },
124
bf0fd768
CL		 125 { Opt_soft, "soft" },
126 { Opt_hard, "hard" },
d33e4dfe
CL		 127 { Opt_deprecated, "intr" },
128 { Opt_deprecated, "nointr" },
bf0fd768
CL		 129 { Opt_posix, "posix" },
130 { Opt_noposix, "noposix" },
131 { Opt_cto, "cto" },
132 { Opt_nocto, "nocto" },
133 { Opt_ac, "ac" },
134 { Opt_noac, "noac" },
135 { Opt_lock, "lock" },
136 { Opt_nolock, "nolock" },
bf0fd768
CL		 137 { Opt_udp, "udp" },
138 { Opt_tcp, "tcp" },
2cf7ff7a 139 { Opt_rdma, "rdma" },
bf0fd768
CL		 140 { Opt_acl, "acl" },
141 { Opt_noacl, "noacl" },
142 { Opt_rdirplus, "rdirplus" },
143 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 144 { Opt_sharecache, "sharecache" },
145 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 146 { Opt_resvport, "resvport" },
147 { Opt_noresvport, "noresvport" },
b797cac7 148 { Opt_fscache, "fsc" },
b797cac7 149 { Opt_nofscache, "nofsc" },
bf0fd768 150
a5a16bae
CL		 151 { Opt_port, "port=%s" },
152 { Opt_rsize, "rsize=%s" },
153 { Opt_wsize, "wsize=%s" },
154 { Opt_bsize, "bsize=%s" },
155 { Opt_timeo, "timeo=%s" },
156 { Opt_retrans, "retrans=%s" },
157 { Opt_acregmin, "acregmin=%s" },
158 { Opt_acregmax, "acregmax=%s" },
159 { Opt_acdirmin, "acdirmin=%s" },
160 { Opt_acdirmax, "acdirmax=%s" },
161 { Opt_actimeo, "actimeo=%s" },
162 { Opt_namelen, "namlen=%s" },
163 { Opt_mountport, "mountport=%s" },
164 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 165 { Opt_minorversion, "minorversion=%s" },
166
a5a16bae
CL		 167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
33832034 175 { Opt_mounthost, "mounthost=%s" },
0ac83779 176 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 177
7973c1f1 178 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 179 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 180 { Opt_local_lock, "local_lock=%s" },
7973c1f1 181
3862279a
TM		 182 /* The following needs to be listed after all other options */
183 { Opt_nfsvers, "v%s" },
184
bf0fd768
CL		 185 { Opt_err, NULL }
186};
187
188enum {
ee671b01 189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 190
191 Opt_xprt_err
192};
193
a447c093 194static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 195 { Opt_xprt_udp, "udp" },
ee671b01 196 { Opt_xprt_udp6, "udp6" },
bf0fd768 197 { Opt_xprt_tcp, "tcp" },
ee671b01 198 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 199 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 200
201 { Opt_xprt_err, NULL }
202};
203
204enum {
205 Opt_sec_none, Opt_sec_sys,
206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
209
210 Opt_sec_err
211};
212
a447c093 213static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 214 { Opt_sec_none, "none" },
215 { Opt_sec_none, "null" },
216 { Opt_sec_sys, "sys" },
217
218 { Opt_sec_krb5, "krb5" },
219 { Opt_sec_krb5i, "krb5i" },
220 { Opt_sec_krb5p, "krb5p" },
221
222 { Opt_sec_lkey, "lkey" },
223 { Opt_sec_lkeyi, "lkeyi" },
224 { Opt_sec_lkeyp, "lkeyp" },
225
8d042218
OK		 226 { Opt_sec_spkm, "spkm3" },
227 { Opt_sec_spkmi, "spkm3i" },
228 { Opt_sec_spkmp, "spkm3p" },
229
bf0fd768
CL		 230 { Opt_sec_err, NULL }
231};
232
7973c1f1
TM		 233enum {
234 Opt_lookupcache_all, Opt_lookupcache_positive,
235 Opt_lookupcache_none,
236
237 Opt_lookupcache_err
238};
239
240static match_table_t nfs_lookupcache_tokens = {
241 { Opt_lookupcache_all, "all" },
242 { Opt_lookupcache_positive, "pos" },
243 { Opt_lookupcache_positive, "positive" },
244 { Opt_lookupcache_none, "none" },
245
246 { Opt_lookupcache_err, NULL }
247};
248
5eebde23
SJ		 249enum {
250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
251 Opt_local_lock_none,
252
253 Opt_local_lock_err
254};
255
256static match_table_t nfs_local_lock_tokens = {
257 { Opt_local_lock_all, "all" },
258 { Opt_local_lock_flock, "flock" },
259 { Opt_local_lock_posix, "posix" },
260 { Opt_local_lock_none, "none" },
261
262 { Opt_local_lock_err, NULL }
263};
264
0d71b058
TM		 265enum {
266 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
267 Opt_vers_4_1,
268
269 Opt_vers_err
270};
271
272static match_table_t nfs_vers_tokens = {
273 { Opt_vers_2, "2" },
274 { Opt_vers_3, "3" },
275 { Opt_vers_4, "4" },
276 { Opt_vers_4_0, "4.0" },
277 { Opt_vers_4_1, "4.1" },
278
279 { Opt_vers_err, NULL }
280};
bf0fd768 281
31f43471
AV		 282static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data);
f7b422b1 284
ab7017a3 285struct file_system_type nfs_fs_type = {
f7b422b1
DH		 286 .owner = THIS_MODULE,
287 .name = "nfs",
01194981 288 .mount = nfs_fs_mount,
f7b422b1 289 .kill_sb = nfs_kill_super,
349457cc 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1 291};
ddda8e0a 292EXPORT_SYMBOL_GPL(nfs_fs_type);
f7b422b1 293
54ceac45 294struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 295 .owner = THIS_MODULE,
296 .name = "nfs",
31f43471 297 .mount = nfs_xdev_mount,
f7b422b1 298 .kill_sb = nfs_kill_super,
349457cc 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 300};
301
6a74490d 302const struct super_operations nfs_sops = {
f7b422b1
DH		 303 .alloc_inode = nfs_alloc_inode,
304 .destroy_inode = nfs_destroy_inode,
305 .write_inode = nfs_write_inode,
387c149b 306 .put_super = nfs_put_super,
f7b422b1 307 .statfs = nfs_statfs,
b57922d9 308 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
c7f404b4
AV		 311 .show_devname = nfs_show_devname,
312 .show_path = nfs_show_path,
f7b422b1 313 .show_stats = nfs_show_stats,
48b605f8 314 .remount_fs = nfs_remount,
f7b422b1 315};
ddda8e0a 316EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 317
89d77c8f 318#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42 319static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 320static int nfs4_validate_mount_data(void *options,
321 struct nfs_parsed_mount_data *args, const char *dev_name);
1ae811ee 322
323struct file_system_type nfs4_fs_type = {
324 .owner = THIS_MODULE,
325 .name = "nfs4",
326 .mount = nfs_fs_mount,
327 .kill_sb = nfs_kill_super,
328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
329};
330EXPORT_SYMBOL_GPL(nfs4_fs_type);
331
332static int __init register_nfs4_fs(void)
333{
334 return register_filesystem(&nfs4_fs_type);
335}
336
337static void unregister_nfs4_fs(void)
338{
339 unregister_filesystem(&nfs4_fs_type);
340}
341#else
342static int __init register_nfs4_fs(void)
343{
344 return 0;
345}
346
347static void unregister_nfs4_fs(void)
348{
349}
f7b422b1
DH		 350#endif
351
8e1f936b
RR		 352static struct shrinker acl_shrinker = {
353 .shrink = nfs_access_cache_shrinker,
354 .seeks = DEFAULT_SEEKS,
355};
979df72e 356
f7b422b1
DH		 357/*
358 * Register the NFS filesystems
359 */
360int __init register_nfs_fs(void)
361{
362 int ret;
363
364 ret = register_filesystem(&nfs_fs_type);
365 if (ret < 0)
366 goto error_0;
367
1ae811ee 368 ret = register_nfs4_fs();
f7b422b1
DH		 369 if (ret < 0)
370 goto error_1;
1ae811ee 371
372 ret = nfs_register_sysctl();
373 if (ret < 0)
374 goto error_2;
8e1f936b 375 register_shrinker(&acl_shrinker);
f7b422b1
DH		 376 return 0;
377
1ae811ee 378error_2:
379 unregister_nfs4_fs();
f7b422b1
DH		 380error_1:
381 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 382error_0:
383 return ret;
384}
385
386/*
387 * Unregister the NFS filesystems
388 */
389void __exit unregister_nfs_fs(void)
390{
8e1f936b 391 unregister_shrinker(&acl_shrinker);
49af7ee1 392 nfs_unregister_sysctl();
1ae811ee 393 unregister_nfs4_fs();
f7b422b1
DH		 394 unregister_filesystem(&nfs_fs_type);
395}
396
1daef0a8 397void nfs_sb_active(struct super_block *sb)
ef818a28 398{
1daef0a8 399 struct nfs_server *server = NFS_SB(sb);
ef818a28 400
1daef0a8
TM		 401 if (atomic_inc_return(&server->active) == 1)
402 atomic_inc(&sb->s_active);
ef818a28 403}
89d77c8f 404EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 405
1daef0a8 406void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 407{
408 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 409
410 if (atomic_dec_and_test(&server->active))
411 deactivate_super(sb);
ef818a28 412}
89d77c8f 413EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 414
f7b422b1
DH		 415/*
416 * Deliver file system statistics to userspace
417 */
fbdefd64 418int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 419{
0c7d90cf 420 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 421 unsigned char blockbits;
422 unsigned long blockres;
0c7d90cf 423 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 424 struct nfs_fsstat res;
425 int error = -ENOMEM;
426
427 res.fattr = nfs_alloc_fattr();
428 if (res.fattr == NULL)
429 goto out_err;
f7b422b1 430
8fa5c000 431 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 432 if (unlikely(error == -ESTALE)) {
433 struct dentry *pd_dentry;
434
435 pd_dentry = dget_parent(dentry);
436 if (pd_dentry != NULL) {
437 nfs_zap_caches(pd_dentry->d_inode);
438 dput(pd_dentry);
439 }
440 }
ca7e9a0d 441 nfs_free_fattr(res.fattr);
f7b422b1
DH		 442 if (error < 0)
443 goto out_err;
ca7e9a0d 444
1a0ba9ae 445 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 446
447 /*
448 * Current versions of glibc do not correctly handle the
449 * case where f_frsize != f_bsize. Eventually we want to
450 * report the value of wtmult in this field.
451 */
0c7d90cf 452 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 453
454 /*
455 * On most *nix systems, f_blocks, f_bfree, and f_bavail
456 * are reported in units of f_frsize. Linux hasn't had
457 * an f_frsize field in its statfs struct until recently,
458 * thus historically Linux's sys_statfs reports these
459 * fields in units of f_bsize.
460 */
0c7d90cf
DH		 461 buf->f_bsize = dentry->d_sb->s_blocksize;
462 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 463 blockres = (1 << blockbits) - 1;
464 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
465 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
466 buf->f_bavail = (res.abytes + blockres) >> blockbits;
467
468 buf->f_files = res.tfiles;
469 buf->f_ffree = res.afiles;
470
471 buf->f_namelen = server->namelen;
1a0ba9ae 472
f7b422b1
DH		 473 return 0;
474
475 out_err:
3110ff80 476 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 477 return error;
f7b422b1 478}
89d77c8f 479EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 480
7d4e2747
DH		 481/*
482 * Map the security flavour number to a name
483 */
81039f1f
TM		 484static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
485{
7d4e2747 486 static const struct {
81039f1f
TM		 487 rpc_authflavor_t flavour;
488 const char *str;
489 } sec_flavours[] = {
490 { RPC_AUTH_NULL, "null" },
491 { RPC_AUTH_UNIX, "sys" },
492 { RPC_AUTH_GSS_KRB5, "krb5" },
493 { RPC_AUTH_GSS_KRB5I, "krb5i" },
494 { RPC_AUTH_GSS_KRB5P, "krb5p" },
495 { RPC_AUTH_GSS_LKEY, "lkey" },
496 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
497 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
498 { RPC_AUTH_GSS_SPKM, "spkm" },
499 { RPC_AUTH_GSS_SPKMI, "spkmi" },
500 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 501 { UINT_MAX, "unknown" }
81039f1f
TM		 502 };
503 int i;
504
4d81cd16 505 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 506 if (sec_flavours[i].flavour == flavour)
507 break;
508 }
509 return sec_flavours[i].str;
510}
511
ee671b01
JL		 512static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
513 int showdefaults)
514{
515 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
516
517 seq_printf(m, ",mountproto=");
518 switch (sap->sa_family) {
519 case AF_INET:
520 switch (nfss->mountd_protocol) {
521 case IPPROTO_UDP:
522 seq_printf(m, RPCBIND_NETID_UDP);
523 break;
524 case IPPROTO_TCP:
525 seq_printf(m, RPCBIND_NETID_TCP);
526 break;
527 default:
528 if (showdefaults)
529 seq_printf(m, "auto");
530 }
531 break;
532 case AF_INET6:
533 switch (nfss->mountd_protocol) {
534 case IPPROTO_UDP:
535 seq_printf(m, RPCBIND_NETID_UDP6);
536 break;
537 case IPPROTO_TCP:
538 seq_printf(m, RPCBIND_NETID_TCP6);
539 break;
540 default:
541 if (showdefaults)
542 seq_printf(m, "auto");
543 }
544 break;
545 default:
546 if (showdefaults)
547 seq_printf(m, "auto");
548 }
549}
550
82d101d5
CL		 551static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
552 int showdefaults)
553{
554 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
555
d5eff1a3
BS		 556 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
557 return;
558
82d101d5
CL		 559 switch (sap->sa_family) {
560 case AF_INET: {
561 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 562 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 563 break;
564 }
565 case AF_INET6: {
566 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 567 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 568 break;
569 }
570 default:
571 if (showdefaults)
572 seq_printf(m, ",mountaddr=unspecified");
573 }
574
575 if (nfss->mountd_version || showdefaults)
576 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 577 if ((nfss->mountd_port &&
578 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
579 showdefaults)
82d101d5
CL		 580 seq_printf(m, ",mountport=%u", nfss->mountd_port);
581
ee671b01 582 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 583}
584
89d77c8f 585#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 586static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
587 int showdefaults)
588{
589 struct nfs_client *clp = nfss->nfs_client;
590
591 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 592}
593#else
594static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
595 int showdefaults)
596{
597}
598#endif
599
7bbceb6f
TM		 600static void nfs_show_nfs_version(struct seq_file *m,
601 unsigned int version,
602 unsigned int minorversion)
603{
604 seq_printf(m, ",vers=%u", version);
605 if (version == 4)
606 seq_printf(m, ".%u", minorversion);
607}
608
f7b422b1
DH		 609/*
610 * Describe the mount options in force on this server representation
611 */
82d101d5
CL		 612static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
613 int showdefaults)
f7b422b1 614{
509de811 615 static const struct proc_nfs_info {
f7b422b1 616 int flag;
509de811
DH		 617 const char *str;
618 const char *nostr;
f7b422b1
DH		 619 } nfs_info[] = {
620 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 621 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 622 { NFS_MOUNT_NOCTO, ",nocto", "" },
623 { NFS_MOUNT_NOAC, ",noac", "" },
624 { NFS_MOUNT_NONLM, ",nolock", "" },
625 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 626 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 627 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
628 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 629 { 0, NULL, NULL }
630 };
509de811 631 const struct proc_nfs_info *nfs_infop;
8fa5c000 632 struct nfs_client *clp = nfss->nfs_client;
82d101d5 633 u32 version = clp->rpc_ops->version;
7c563cc9 634 int local_flock, local_fcntl;
f7b422b1 635
7bbceb6f 636 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 637 seq_printf(m, ",rsize=%u", nfss->rsize);
638 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 639 if (nfss->bsize != 0)
640 seq_printf(m, ",bsize=%u", nfss->bsize);
641 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 642 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 643 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 644 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 645 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 646 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 647 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 648 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 649 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 650 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
651 if (nfss->flags & nfs_infop->flag)
652 seq_puts(m, nfs_infop->str);
653 else
654 seq_puts(m, nfs_infop->nostr);
655 }
2446ab60 656 rcu_read_lock();
56928edd 657 seq_printf(m, ",proto=%s",
ee671b01 658 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 659 rcu_read_unlock();
82d101d5
CL		 660 if (version == 4) {
661 if (nfss->port != NFS_PORT)
662 seq_printf(m, ",port=%u", nfss->port);
663 } else
664 if (nfss->port)
665 seq_printf(m, ",port=%u", nfss->port);
666
33170233
TM		 667 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
668 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 669 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 670
671 if (version != 4)
672 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 673 else
674 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 675
b797cac7
DH		 676 if (nfss->options & NFS_OPTION_FSCACHE)
677 seq_printf(m, ",fsc");
9b00c643
PL		 678
679 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
680 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
681 seq_printf(m, ",lookupcache=none");
682 else
683 seq_printf(m, ",lookupcache=pos");
684 }
7c563cc9
SJ		 685
686 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
687 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
688
689 if (!local_flock && !local_fcntl)
690 seq_printf(m, ",local_lock=none");
691 else if (local_flock && local_fcntl)
692 seq_printf(m, ",local_lock=all");
693 else if (local_flock)
694 seq_printf(m, ",local_lock=flock");
695 else
696 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 697}
698
699/*
700 * Describe the mount options on this VFS mountpoint
701 */
fbdefd64 702int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 703{
34c80b1d 704 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 705
706 nfs_show_mount_options(m, nfss, 0);
707
2446ab60 708 rcu_read_lock();
5d8515ca
CL		 709 seq_printf(m, ",addr=%s",
710 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
711 RPC_DISPLAY_ADDR));
2446ab60 712 rcu_read_unlock();
f7b422b1
DH		 713
714 return 0;
715}
89d77c8f 716EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 717
89d77c8f 718#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 719#ifdef CONFIG_NFS_V4_1
45402c38 720static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 721{
722 if (nfs4_has_session(server->nfs_client))
723 seq_printf(m, ",sessions");
724}
725#else
45402c38
HS		 726static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
727#endif
ae50c0b5
BF		 728#endif
729
730#ifdef CONFIG_NFS_V4_1
45402c38 731static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 732{
733 seq_printf(m, ",pnfs=");
734 if (server->pnfs_curr_ld)
735 seq_printf(m, "%s", server->pnfs_curr_ld->name);
736 else
737 seq_printf(m, "not configured");
738}
7e03b7cc
TM		 739
740static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
741{
59155546
CL		 742 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
743 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 744 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
745 "date='%llu,%u'",
746 impl_id->name, impl_id->domain,
747 impl_id->date.seconds, impl_id->date.nseconds);
748 }
749}
45402c38 750#else
89d77c8f 751#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 752static void show_pnfs(struct seq_file *m, struct nfs_server *server)
753{
754}
45402c38 755#endif
7e03b7cc
TM		 756static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
757{
758}
45402c38 759#endif
f7b422b1 760
fbdefd64 761int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 762{
763 char *page = (char *) __get_free_page(GFP_KERNEL);
764 char *devname, *dummy;
765 int err = 0;
766 if (!page)
767 return -ENOMEM;
d861c630 768 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 769 if (IS_ERR(devname))
770 err = PTR_ERR(devname);
771 else
772 seq_escape(m, devname, " \t\n\\");
773 free_page((unsigned long)page);
774 return err;
775}
89d77c8f 776EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 777
fbdefd64 778int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 779{
780 seq_puts(m, "/");
781 return 0;
782}
89d77c8f 783EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 784
f7b422b1
DH		 785/*
786 * Present statistical information for this VFS mountpoint
787 */
fbdefd64 788int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 789{
790 int i, cpu;
64132379 791 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 792 struct rpc_auth *auth = nfss->client->cl_auth;
793 struct nfs_iostats totals = { };
794
795 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
796
797 /*
798 * Display all mount option settings
799 */
800 seq_printf(m, "\n\topts:\t");
64132379
AV		 801 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
802 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
803 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 805 nfs_show_mount_options(m, nfss, 1);
806
807 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
808
7e03b7cc 809 show_implementation_id(m, nfss);
7d2ed9ac 810
f7b422b1
DH		 811 seq_printf(m, "\n\tcaps:\t");
812 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 813 seq_printf(m, ",wtmult=%u", nfss->wtmult);
814 seq_printf(m, ",dtsize=%u", nfss->dtsize);
815 seq_printf(m, ",bsize=%u", nfss->bsize);
816 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 817
89d77c8f 818#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 819 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 820 seq_printf(m, "\n\tnfsv4:\t");
821 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
822 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
823 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 824 show_sessions(m, nfss);
825 show_pnfs(m, nfss);
f7b422b1
DH		 826 }
827#endif
828
829 /*
830 * Display security flavor in effect for this mount
831 */
2d767432 832 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 833 if (auth->au_flavor)
2d767432 834 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 835
836 /*
837 * Display superblock I/O counters
838 */
839 for_each_possible_cpu(cpu) {
840 struct nfs_iostats *stats;
841
842 preempt_disable();
843 stats = per_cpu_ptr(nfss->io_stats, cpu);
844
845 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
846 totals.events[i] += stats->events[i];
847 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
848 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 849#ifdef CONFIG_NFS_FSCACHE
850 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
851 totals.fscache[i] += stats->fscache[i];
852#endif
f7b422b1
DH		 853
854 preempt_enable();
855 }
856
857 seq_printf(m, "\n\tevents:\t");
858 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
859 seq_printf(m, "%lu ", totals.events[i]);
860 seq_printf(m, "\n\tbytes:\t");
861 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
862 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 863#ifdef CONFIG_NFS_FSCACHE
864 if (nfss->options & NFS_OPTION_FSCACHE) {
865 seq_printf(m, "\n\tfsc:\t");
866 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
867 seq_printf(m, "%Lu ", totals.bytes[i]);
868 }
869#endif
f7b422b1
DH		 870 seq_printf(m, "\n");
871
872 rpc_print_iostats(m, nfss->client);
873
874 return 0;
875}
89d77c8f 876EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 877
878/*
879 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 880 * in response to xdev traversals and referrals
f7b422b1 881 */
fbdefd64 882void nfs_umount_begin(struct super_block *sb)
f7b422b1 883{
67e55205 884 struct nfs_server *server;
fc6ae3cf
TM		 885 struct rpc_clnt *rpc;
886
67e55205 887 server = NFS_SB(sb);
fc6ae3cf
TM		 888 /* -EIO all pending I/O */
889 rpc = server->client_acl;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
892 rpc = server->client;
893 if (!IS_ERR(rpc))
894 rpc_killall_tasks(rpc);
f7b422b1 895}
89d77c8f 896EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 897
db833351 898static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 899{
900 struct nfs_parsed_mount_data *data;
901
902 data = kzalloc(sizeof(*data), GFP_KERNEL);
903 if (data) {
9423a08a
CL		 904 data->acregmin = NFS_DEF_ACREGMIN;
905 data->acregmax = NFS_DEF_ACREGMAX;
906 data->acdirmin = NFS_DEF_ACDIRMIN;
907 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 908 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 909 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 910 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 911 data->auth_flavors[0] = RPC_AUTH_UNIX;
912 data->auth_flavor_len = 1;
913 data->minorversion = 0;
b72e4f42 914 data->need_mount = true;
9937347a 915 data->net = current->nsproxy->net_ns;
8a0d551a 916 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 917 }
918 return data;
919}
920
8a0d551a
JL		 921static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
922{
923 if (data) {
924 kfree(data->client_address);
925 kfree(data->mount_server.hostname);
926 kfree(data->nfs_server.export_path);
927 kfree(data->nfs_server.hostname);
928 kfree(data->fscache_uniq);
929 security_free_mnt_opts(&data->lsm_opts);
930 kfree(data);
931 }
932}
933
fc50d58f 934/*
cdcd7f9a
CL		 935 * Sanity-check a server address provided by the mount command.
936 *
937 * Address family must be initialized, and address must not be
938 * the ANY address for that family.
fc50d58f
CL		 939 */
940static int nfs_verify_server_address(struct sockaddr *addr)
941{
942 switch (addr->sa_family) {
943 case AF_INET: {
cdcd7f9a 944 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 945 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 946 }
947 case AF_INET6: {
948 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
949 return !ipv6_addr_any(sa);
fc50d58f
CL		 950 }
951 }
952
53a0b9c4 953 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 954 return 0;
955}
956
4cfd74fc
CL		 957/*
958 * Select between a default port value and a user-specified port value.
959 * If a zero value is set, then autobind will be used.
960 */
f5855fec 961static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 962 const unsigned short default_port)
963{
f5855fec
TM		 964 if (*port == NFS_UNSPEC_PORT)
965 *port = default_port;
4cfd74fc 966
f5855fec 967 rpc_set_port(sap, *port);
4cfd74fc
CL		 968}
969
259875ef
TM		 970/*
971 * Sanity check the NFS transport protocol.
972 *
973 */
974static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
975{
976 switch (mnt->nfs_server.protocol) {
977 case XPRT_TRANSPORT_UDP:
978 case XPRT_TRANSPORT_TCP:
979 case XPRT_TRANSPORT_RDMA:
980 break;
981 default:
982 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
983 }
984}
985
986/*
987 * For text based NFSv2/v3 mounts, the mount protocol transport default
988 * settings should depend upon the specified NFS transport.
989 */
990static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
991{
992 nfs_validate_transport_protocol(mnt);
993
994 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
995 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
996 return;
997 switch (mnt->nfs_server.protocol) {
998 case XPRT_TRANSPORT_UDP:
999 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1000 break;
1001 case XPRT_TRANSPORT_TCP:
1002 case XPRT_TRANSPORT_RDMA:
1003 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1004 }
1005}
1006
01060c89
CL		 1007/*
1008 * Parse the value of the 'sec=' option.
01060c89
CL		 1009 */
1010static int nfs_parse_security_flavors(char *value,
1011 struct nfs_parsed_mount_data *mnt)
1012{
1013 substring_t args[MAX_OPT_ARGS];
1014
1015 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1016
1017 switch (match_token(value, nfs_secflavor_tokens, args)) {
1018 case Opt_sec_none:
01060c89
CL		 1019 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1020 break;
1021 case Opt_sec_sys:
01060c89
CL		 1022 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1023 break;
1024 case Opt_sec_krb5:
01060c89
CL		 1025 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1026 break;
1027 case Opt_sec_krb5i:
01060c89
CL		 1028 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1029 break;
1030 case Opt_sec_krb5p:
01060c89
CL		 1031 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1032 break;
1033 case Opt_sec_lkey:
01060c89
CL		 1034 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1035 break;
1036 case Opt_sec_lkeyi:
01060c89
CL		 1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1038 break;
1039 case Opt_sec_lkeyp:
01060c89
CL		 1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1041 break;
1042 case Opt_sec_spkm:
01060c89
CL		 1043 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1044 break;
1045 case Opt_sec_spkmi:
01060c89
CL		 1046 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1047 break;
1048 case Opt_sec_spkmp:
01060c89
CL		 1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1050 break;
1051 default:
1052 return 0;
1053 }
1054
9b7160c5 1055 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1056 mnt->auth_flavor_len = 1;
01060c89
CL		 1057 return 1;
1058}
1059
0d71b058
TM		 1060static int nfs_parse_version_string(char *string,
1061 struct nfs_parsed_mount_data *mnt,
1062 substring_t *args)
1063{
1064 mnt->flags &= ~NFS_MOUNT_VER3;
1065 switch (match_token(string, nfs_vers_tokens, args)) {
1066 case Opt_vers_2:
1067 mnt->version = 2;
1068 break;
1069 case Opt_vers_3:
1070 mnt->flags |= NFS_MOUNT_VER3;
1071 mnt->version = 3;
1072 break;
1073 case Opt_vers_4:
1074 /* Backward compatibility option. In future,
1075 * the mount program should always supply
1076 * a NFSv4 minor version number.
1077 */
1078 mnt->version = 4;
1079 break;
1080 case Opt_vers_4_0:
1081 mnt->version = 4;
1082 mnt->minorversion = 0;
1083 break;
1084 case Opt_vers_4_1:
1085 mnt->version = 4;
1086 mnt->minorversion = 1;
1087 break;
1088 default:
1089 return 0;
1090 }
1091 return 1;
1092}
1093
c5cb09b6
RL		 1094static int nfs_get_option_str(substring_t args[], char **option)
1095{
1096 kfree(*option);
1097 *option = match_strdup(args);
1098 return !option;
1099}
1100
1101static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1102{
1103 int rc;
1104 char *string;
1105
1106 string = match_strdup(args);
1107 if (string == NULL)
1108 return -ENOMEM;
1109 rc = strict_strtoul(string, 10, option);
1110 kfree(string);
1111
1112 return rc;
1113}
1114
bf0fd768
CL		 1115/*
1116 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1117 * a data structure. The whole mount string is processed; bad options are
1118 * skipped as they are encountered. If there were no errors, return 1;
1119 * otherwise return 0 (zero).
bf0fd768
CL		 1120 */
1121static int nfs_parse_mount_options(char *raw,
1122 struct nfs_parsed_mount_data *mnt)
1123{
f9c3a380 1124 char *p, *string, *secdata;
d23c45fd 1125 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1126 unsigned short protofamily = AF_UNSPEC;
1127 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1128
1129 if (!raw) {
1130 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1131 return 1;
1132 }
1133 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1134
f9c3a380
EP		 1135 secdata = alloc_secdata();
1136 if (!secdata)
1137 goto out_nomem;
1138
1139 rc = security_sb_copy_data(raw, secdata);
1140 if (rc)
1141 goto out_security_failure;
1142
1143 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1144 if (rc)
1145 goto out_security_failure;
1146
1147 free_secdata(secdata);
1148
bf0fd768
CL		 1149 while ((p = strsep(&raw, ",")) != NULL) {
1150 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1151 unsigned long option;
1152 int token;
bf0fd768
CL		 1153
1154 if (!*p)
1155 continue;
1156
1157 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1158
1159 token = match_token(p, nfs_mount_option_tokens, args);
1160 switch (token) {
f45663ce
CL		 1161
1162 /*
1163 * boolean options: foo/nofoo
1164 */
bf0fd768
CL		 1165 case Opt_soft:
1166 mnt->flags |= NFS_MOUNT_SOFT;
1167 break;
1168 case Opt_hard:
1169 mnt->flags &= ~NFS_MOUNT_SOFT;
1170 break;
bf0fd768
CL		 1171 case Opt_posix:
1172 mnt->flags |= NFS_MOUNT_POSIX;
1173 break;
1174 case Opt_noposix:
1175 mnt->flags &= ~NFS_MOUNT_POSIX;
1176 break;
1177 case Opt_cto:
1178 mnt->flags &= ~NFS_MOUNT_NOCTO;
1179 break;
1180 case Opt_nocto:
1181 mnt->flags |= NFS_MOUNT_NOCTO;
1182 break;
1183 case Opt_ac:
1184 mnt->flags &= ~NFS_MOUNT_NOAC;
1185 break;
1186 case Opt_noac:
1187 mnt->flags |= NFS_MOUNT_NOAC;
1188 break;
1189 case Opt_lock:
1190 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1191 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1192 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1193 break;
1194 case Opt_nolock:
1195 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1196 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1197 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1198 break;
bf0fd768
CL		 1199 case Opt_udp:
1200 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1201 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1202 break;
1203 case Opt_tcp:
1204 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1205 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1206 break;
2cf7ff7a
TT		 1207 case Opt_rdma:
1208 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1210 xprt_load_transport(p);
2cf7ff7a 1211 break;
bf0fd768
CL		 1212 case Opt_acl:
1213 mnt->flags &= ~NFS_MOUNT_NOACL;
1214 break;
1215 case Opt_noacl:
1216 mnt->flags |= NFS_MOUNT_NOACL;
1217 break;
1218 case Opt_rdirplus:
1219 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1220 break;
1221 case Opt_nordirplus:
1222 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1223 break;
75180df2
TM		 1224 case Opt_sharecache:
1225 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1226 break;
1227 case Opt_nosharecache:
1228 mnt->flags |= NFS_MOUNT_UNSHARED;
1229 break;
d740351b
CL		 1230 case Opt_resvport:
1231 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1232 break;
1233 case Opt_noresvport:
1234 mnt->flags |= NFS_MOUNT_NORESVPORT;
1235 break;
b797cac7
DH		 1236 case Opt_fscache:
1237 mnt->options |= NFS_OPTION_FSCACHE;
1238 kfree(mnt->fscache_uniq);
1239 mnt->fscache_uniq = NULL;
1240 break;
1241 case Opt_nofscache:
1242 mnt->options &= ~NFS_OPTION_FSCACHE;
1243 kfree(mnt->fscache_uniq);
1244 mnt->fscache_uniq = NULL;
1245 break;
bf0fd768 1246
f45663ce
CL		 1247 /*
1248 * options that take numeric values
1249 */
bf0fd768 1250 case Opt_port:
c5cb09b6
RL		 1251 if (nfs_get_option_ul(args, &option) ||
1252 option > USHRT_MAX)
d23c45fd
CL		 1253 goto out_invalid_value;
1254 mnt->nfs_server.port = option;
bf0fd768
CL		 1255 break;
1256 case Opt_rsize:
c5cb09b6 1257 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1258 goto out_invalid_value;
1259 mnt->rsize = option;
bf0fd768
CL		 1260 break;
1261 case Opt_wsize:
c5cb09b6 1262 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1263 goto out_invalid_value;
1264 mnt->wsize = option;
bf0fd768
CL		 1265 break;
1266 case Opt_bsize:
c5cb09b6 1267 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1268 goto out_invalid_value;
1269 mnt->bsize = option;
bf0fd768
CL		 1270 break;
1271 case Opt_timeo:
c5cb09b6 1272 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1273 goto out_invalid_value;
1274 mnt->timeo = option;
bf0fd768
CL		 1275 break;
1276 case Opt_retrans:
c5cb09b6 1277 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1278 goto out_invalid_value;
1279 mnt->retrans = option;
bf0fd768
CL		 1280 break;
1281 case Opt_acregmin:
c5cb09b6 1282 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1283 goto out_invalid_value;
1284 mnt->acregmin = option;
bf0fd768
CL		 1285 break;
1286 case Opt_acregmax:
c5cb09b6 1287 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1288 goto out_invalid_value;
1289 mnt->acregmax = option;
bf0fd768
CL		 1290 break;
1291 case Opt_acdirmin:
c5cb09b6 1292 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1293 goto out_invalid_value;
1294 mnt->acdirmin = option;
bf0fd768
CL		 1295 break;
1296 case Opt_acdirmax:
c5cb09b6 1297 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1298 goto out_invalid_value;
1299 mnt->acdirmax = option;
bf0fd768
CL		 1300 break;
1301 case Opt_actimeo:
c5cb09b6 1302 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1303 goto out_invalid_value;
1304 mnt->acregmin = mnt->acregmax =
1305 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1306 break;
1307 case Opt_namelen:
c5cb09b6 1308 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1309 goto out_invalid_value;
1310 mnt->namlen = option;
bf0fd768
CL		 1311 break;
1312 case Opt_mountport:
c5cb09b6
RL		 1313 if (nfs_get_option_ul(args, &option) ||
1314 option > USHRT_MAX)
d23c45fd
CL		 1315 goto out_invalid_value;
1316 mnt->mount_server.port = option;
bf0fd768 1317 break;
bf0fd768 1318 case Opt_mountvers:
c5cb09b6 1319 if (nfs_get_option_ul(args, &option) ||
f45663ce 1320 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1321 option > NFS_MNT3_VERSION)
1322 goto out_invalid_value;
1323 mnt->mount_server.version = option;
bf0fd768 1324 break;
3fd5be9e 1325 case Opt_minorversion:
c5cb09b6 1326 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1327 goto out_invalid_value;
1328 if (option > NFS4_MAX_MINOR_VERSION)
1329 goto out_invalid_value;
1330 mnt->minorversion = option;
3fd5be9e 1331 break;
bf0fd768 1332
f45663ce
CL		 1333 /*
1334 * options that take text values
1335 */
0d71b058
TM		 1336 case Opt_nfsvers:
1337 string = match_strdup(args);
1338 if (string == NULL)
1339 goto out_nomem;
1340 rc = nfs_parse_version_string(string, mnt, args);
1341 kfree(string);
1342 if (!rc)
1343 goto out_invalid_value;
1344 break;
bf0fd768
CL		 1345 case Opt_sec:
1346 string = match_strdup(args);
1347 if (string == NULL)
1348 goto out_nomem;
01060c89 1349 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1350 kfree(string);
f45663ce 1351 if (!rc) {
f45663ce
CL		 1352 dfprintk(MOUNT, "NFS: unrecognized "
1353 "security flavor\n");
d23c45fd 1354 return 0;
f45663ce 1355 }
bf0fd768
CL		 1356 break;
1357 case Opt_proto:
1358 string = match_strdup(args);
1359 if (string == NULL)
1360 goto out_nomem;
1361 token = match_token(string,
1362 nfs_xprt_protocol_tokens, args);
bf0fd768 1363
ee671b01 1364 protofamily = AF_INET;
bf0fd768 1365 switch (token) {
ee671b01
JL		 1366 case Opt_xprt_udp6:
1367 protofamily = AF_INET6;
fdb66ff4 1368 case Opt_xprt_udp:
bf0fd768 1369 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1370 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1371 break;
ee671b01
JL		 1372 case Opt_xprt_tcp6:
1373 protofamily = AF_INET6;
fdb66ff4 1374 case Opt_xprt_tcp:
bf0fd768 1375 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1376 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1377 break;
2cf7ff7a
TT		 1378 case Opt_xprt_rdma:
1379 /* vector side protocols to TCP */
1380 mnt->flags |= NFS_MOUNT_TCP;
1381 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1382 xprt_load_transport(string);
2cf7ff7a 1383 break;
bf0fd768 1384 default:
f45663ce
CL		 1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "transport protocol\n");
4223a4a1 1387 kfree(string);
d23c45fd 1388 return 0;
bf0fd768 1389 }
c5cb09b6 1390 kfree(string);
bf0fd768
CL		 1391 break;
1392 case Opt_mountproto:
1393 string = match_strdup(args);
1394 if (string == NULL)
1395 goto out_nomem;
1396 token = match_token(string,
1397 nfs_xprt_protocol_tokens, args);
d508afb4 1398 kfree(string);
bf0fd768 1399
ee671b01 1400 mountfamily = AF_INET;
bf0fd768 1401 switch (token) {
ee671b01
JL		 1402 case Opt_xprt_udp6:
1403 mountfamily = AF_INET6;
fdb66ff4 1404 case Opt_xprt_udp:
0896a725 1405 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1406 break;
ee671b01
JL		 1407 case Opt_xprt_tcp6:
1408 mountfamily = AF_INET6;
fdb66ff4 1409 case Opt_xprt_tcp:
0896a725 1410 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1411 break;
2cf7ff7a 1412 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1413 default:
f45663ce
CL		 1414 dfprintk(MOUNT, "NFS: unrecognized "
1415 "transport protocol\n");
d23c45fd 1416 return 0;
bf0fd768
CL		 1417 }
1418 break;
1419 case Opt_addr:
1420 string = match_strdup(args);
1421 if (string == NULL)
1422 goto out_nomem;
53a0b9c4 1423 mnt->nfs_server.addrlen =
b48e1278 1424 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1425 (struct sockaddr *)
1426 &mnt->nfs_server.address,
1427 sizeof(mnt->nfs_server.address));
bf0fd768 1428 kfree(string);
53a0b9c4
CL		 1429 if (mnt->nfs_server.addrlen == 0)
1430 goto out_invalid_address;
bf0fd768
CL		 1431 break;
1432 case Opt_clientaddr:
c5cb09b6 1433 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1434 goto out_nomem;
bf0fd768 1435 break;
33832034 1436 case Opt_mounthost:
c5cb09b6
RL		 1437 if (nfs_get_option_str(args,
1438 &mnt->mount_server.hostname))
33832034 1439 goto out_nomem;
33832034 1440 break;
0ac83779 1441 case Opt_mountaddr:
bf0fd768
CL		 1442 string = match_strdup(args);
1443 if (string == NULL)
1444 goto out_nomem;
53a0b9c4 1445 mnt->mount_server.addrlen =
b48e1278 1446 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1447 (struct sockaddr *)
1448 &mnt->mount_server.address,
1449 sizeof(mnt->mount_server.address));
bf0fd768 1450 kfree(string);
53a0b9c4
CL		 1451 if (mnt->mount_server.addrlen == 0)
1452 goto out_invalid_address;
bf0fd768 1453 break;
7973c1f1
TM		 1454 case Opt_lookupcache:
1455 string = match_strdup(args);
1456 if (string == NULL)
1457 goto out_nomem;
1458 token = match_token(string,
1459 nfs_lookupcache_tokens, args);
1460 kfree(string);
1461 switch (token) {
1462 case Opt_lookupcache_all:
1463 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1464 break;
1465 case Opt_lookupcache_positive:
1466 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1467 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1468 break;
1469 case Opt_lookupcache_none:
1470 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1471 break;
1472 default:
7973c1f1
TM		 1473 dfprintk(MOUNT, "NFS: invalid "
1474 "lookupcache argument\n");
d23c45fd 1475 return 0;
7973c1f1
TM		 1476 };
1477 break;
a6d5ff64 1478 case Opt_fscache_uniq:
c5cb09b6 1479 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1480 goto out_nomem;
a6d5ff64
CL		 1481 mnt->options |= NFS_OPTION_FSCACHE;
1482 break;
5eebde23
SJ		 1483 case Opt_local_lock:
1484 string = match_strdup(args);
1485 if (string == NULL)
1486 goto out_nomem;
1487 token = match_token(string, nfs_local_lock_tokens,
1488 args);
1489 kfree(string);
1490 switch (token) {
1491 case Opt_local_lock_all:
1492 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1493 NFS_MOUNT_LOCAL_FCNTL);
1494 break;
1495 case Opt_local_lock_flock:
1496 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1497 break;
1498 case Opt_local_lock_posix:
1499 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1500 break;
1501 case Opt_local_lock_none:
1502 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1503 NFS_MOUNT_LOCAL_FCNTL);
1504 break;
1505 default:
1506 dfprintk(MOUNT, "NFS: invalid "
1507 "local_lock argument\n");
1508 return 0;
1509 };
1510 break;
bf0fd768 1511
f45663ce
CL		 1512 /*
1513 * Special options
1514 */
1515 case Opt_sloppy:
1516 sloppy = 1;
1517 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1518 break;
bf0fd768
CL		 1519 case Opt_userspace:
1520 case Opt_deprecated:
d33e4dfe
CL		 1521 dfprintk(MOUNT, "NFS: ignoring mount option "
1522 "'%s'\n", p);
bf0fd768
CL		 1523 break;
1524
1525 default:
d23c45fd 1526 invalid_option = 1;
f45663ce
CL		 1527 dfprintk(MOUNT, "NFS: unrecognized mount option "
1528 "'%s'\n", p);
bf0fd768
CL		 1529 }
1530 }
1531
d23c45fd
CL		 1532 if (!sloppy && invalid_option)
1533 return 0;
1534
571b7554
WAA		 1535 if (mnt->minorversion && mnt->version != 4)
1536 goto out_minorversion_mismatch;
1537
ee671b01
JL		 1538 /*
1539 * verify that any proto=/mountproto= options match the address
1540 * familiies in the addr=/mountaddr= options.
1541 */
1542 if (protofamily != AF_UNSPEC &&
1543 protofamily != mnt->nfs_server.address.ss_family)
1544 goto out_proto_mismatch;
1545
1546 if (mountfamily != AF_UNSPEC) {
1547 if (mnt->mount_server.addrlen) {
1548 if (mountfamily != mnt->mount_server.address.ss_family)
1549 goto out_mountproto_mismatch;
1550 } else {
1551 if (mountfamily != mnt->nfs_server.address.ss_family)
1552 goto out_mountproto_mismatch;
1553 }
1554 }
1555
bf0fd768
CL		 1556 return 1;
1557
ee671b01
JL		 1558out_mountproto_mismatch:
1559 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1560 "option\n");
1561 return 0;
1562out_proto_mismatch:
1563 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1564 return 0;
53a0b9c4
CL		 1565out_invalid_address:
1566 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1567 return 0;
d23c45fd 1568out_invalid_value:
53a0b9c4 1569 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1570 return 0;
571b7554
WAA		 1571out_minorversion_mismatch:
1572 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1573 "minorversion=%u\n", mnt->version, mnt->minorversion);
1574 return 0;
bf0fd768
CL		 1575out_nomem:
1576 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1577 return 0;
f9c3a380
EP		 1578out_security_failure:
1579 free_secdata(secdata);
1580 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1581 return 0;
bf0fd768
CL		 1582}
1583
ec88f28d
CL		 1584/*
1585 * Match the requested auth flavors with the list returned by
1586 * the server. Returns zero and sets the mount's authentication
1587 * flavor on success; returns -EACCES if server does not support
1588 * the requested flavor.
1589 */
1590static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1591 struct nfs_mount_request *request)
1592{
1593 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1594
5eecfde6
CL		 1595 /*
1596 * Certain releases of Linux's mountd return an empty
1597 * flavor list. To prevent behavioral regression with
1598 * these servers (ie. rejecting mounts that used to
1599 * succeed), revert to pre-2.6.32 behavior (no checking)
1600 * if the returned flavor list is empty.
1601 */
1602 if (server_authlist_len == 0)
1603 return 0;
1604
ec88f28d
CL		 1605 /*
1606 * We avoid sophisticated negotiating here, as there are
1607 * plenty of cases where we can get it wrong, providing
1608 * either too little or too much security.
1609 *
1610 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1611 * flavor listed first. However, some servers list
1612 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1613 * preferred default, in args->auth_flavors[0] if user
1614 * didn't specify sec= mount option.
1615 */
1616 for (i = 0; i < args->auth_flavor_len; i++)
1617 for (j = 0; j < server_authlist_len; j++)
1618 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1619 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1620 request->auth_flavs[j]);
1621 args->auth_flavors[0] = request->auth_flavs[j];
1622 return 0;
1623 }
1624
1625 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1626 nfs_umount(request);
1627 return -EACCES;
1628}
1629
0076d7b7
CL		 1630/*
1631 * Use the remote server's MOUNT service to request the NFS file handle
1632 * corresponding to the provided path.
1633 */
486aa699
BS		 1634static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1635 struct nfs_fh *root_fh)
0076d7b7 1636{
ec88f28d
CL		 1637 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1638 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1639 struct nfs_mount_request request = {
1640 .sap = (struct sockaddr *)
1641 &args->mount_server.address,
1642 .dirpath = args->nfs_server.export_path,
1643 .protocol = args->mount_server.protocol,
1644 .fh = root_fh,
50a737f8 1645 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1646 .auth_flav_len = &server_authlist_len,
1647 .auth_flavs = server_authlist,
6d59b8d5 1648 .net = args->net,
c5d120f8 1649 };
4c568017 1650 int status;
0076d7b7
CL		 1651
1652 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1653 switch (args->version) {
1654 default:
1655 args->mount_server.version = NFS_MNT3_VERSION;
1656 break;
1657 case 2:
1658 args->mount_server.version = NFS_MNT_VERSION;
1659 }
0076d7b7 1660 }
c5d120f8 1661 request.version = args->mount_server.version;
0076d7b7 1662
33832034 1663 if (args->mount_server.hostname)
c5d120f8 1664 request.hostname = args->mount_server.hostname;
33832034 1665 else
c5d120f8 1666 request.hostname = args->nfs_server.hostname;
33832034 1667
0076d7b7
CL		 1668 /*
1669 * Construct the mount server's address.
1670 */
4c568017 1671 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1672 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1673 args->nfs_server.addrlen);
1674 args->mount_server.addrlen = args->nfs_server.addrlen;
1675 }
c5d120f8 1676 request.salen = args->mount_server.addrlen;
f5855fec 1677 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1678
1679 /*
1680 * Now ask the mount server to map our export path
1681 * to a file handle.
1682 */
c5d120f8 1683 status = nfs_mount(&request);
ec88f28d
CL		 1684 if (status != 0) {
1685 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1686 request.hostname, status);
1687 return status;
1688 }
0076d7b7 1689
ec88f28d
CL		 1690 /*
1691 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1692 */
1693 if (args->mount_server.version != NFS_MNT3_VERSION)
1694 return 0;
1695 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1696}
1697
ff9099f2
BS		 1698struct dentry *nfs_try_mount(int flags, const char *dev_name,
1699 struct nfs_mount_info *mount_info,
1700 struct nfs_subversion *nfs_mod)
486aa699
BS		 1701{
1702 int status;
1703 struct nfs_server *server;
1704
b72e4f42 1705 if (mount_info->parsed->need_mount) {
87c7083d 1706 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1707 if (status)
1708 return ERR_PTR(status);
1709 }
486aa699
BS		 1710
1711 /* Get a volume representation */
1179acc6 1712 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699
BS		 1713 if (IS_ERR(server))
1714 return ERR_CAST(server);
1715
ab7017a3 1716 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1717}
ddda8e0a 1718EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1719
c12bacec
RL		 1720/*
1721 * Split "dev_name" into "hostname:export_path".
1722 *
1723 * The leftmost colon demarks the split between the server's hostname
1724 * and the export path. If the hostname starts with a left square
1725 * bracket, then it may contain colons.
1726 *
1727 * Note: caller frees hostname and export path, even on error.
1728 */
1729static int nfs_parse_devname(const char *dev_name,
1730 char **hostname, size_t maxnamlen,
1731 char **export_path, size_t maxpathlen)
dc045898
CL		 1732{
1733 size_t len;
c12bacec 1734 char *end;
dc045898 1735
c12bacec
RL		 1736 /* Is the host name protected with square brakcets? */
1737 if (*dev_name == '[') {
1738 end = strchr(++dev_name, ']');
1739 if (end == NULL || end[1] != ':')
dc045898 1740 goto out_bad_devname;
dc045898 1741
c12bacec
RL		 1742 len = end - dev_name;
1743 end++;
1744 } else {
1745 char *comma;
dc045898 1746
c12bacec
RL		 1747 end = strchr(dev_name, ':');
1748 if (end == NULL)
1749 goto out_bad_devname;
1750 len = end - dev_name;
d1aa0825 1751
c12bacec
RL		 1752 /* kill possible hostname list: not supported */
1753 comma = strchr(dev_name, ',');
1754 if (comma != NULL && comma < end)
1755 *comma = 0;
1756 }
d1aa0825 1757
d1aa0825
CL		 1758 if (len > maxnamlen)
1759 goto out_hostname;
1760
1761 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1762 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1763 if (*hostname == NULL)
1764 goto out_nomem;
c12bacec 1765 len = strlen(++end);
d1aa0825
CL		 1766 if (len > maxpathlen)
1767 goto out_path;
1768 *export_path = kstrndup(end, len, GFP_KERNEL);
1769 if (!*export_path)
1770 goto out_nomem;
1771
c12bacec 1772 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1773 return 0;
1774
1775out_bad_devname:
1776 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1777 return -EINVAL;
1778
1779out_nomem:
1780 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1781 return -ENOMEM;
1782
1783out_hostname:
1784 dfprintk(MOUNT, "NFS: server hostname too long\n");
1785 return -ENAMETOOLONG;
1786
1787out_path:
1788 dfprintk(MOUNT, "NFS: export pathname too long\n");
1789 return -ENAMETOOLONG;
1790}
1791
f7b422b1 1792/*
54ceac45
DH		 1793 * Validate the NFS2/NFS3 mount data
1794 * - fills in the mount root filehandle
136d558c
CL		 1795 *
1796 * For option strings, user space handles the following behaviors:
1797 *
1798 * + DNS: mapping server host name to IP address ("addr=" option)
1799 *
1800 * + failure mode: how to behave if a mount request can't be handled
1801 * immediately ("fg/bg" option)
1802 *
1803 * + retry: how often to retry a mount request ("retry=" option)
1804 *
1805 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1806 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1807 */
d72c727c
BS		 1808static int nfs23_validate_mount_data(void *options,
1809 struct nfs_parsed_mount_data *args,
1810 struct nfs_fh *mntfh,
1811 const char *dev_name)
f7b422b1 1812{
2283f8d6 1813 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1814 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1815
5df36e78
CL		 1816 if (data == NULL)
1817 goto out_no_data;
f7b422b1 1818
c5afc8da 1819 args->version = NFS_DEFAULT_VERSION;
54ceac45 1820 switch (data->version) {
5df36e78
CL		 1821 case 1:
1822 data->namlen = 0;
1823 case 2:
1824 data->bsize = 0;
1825 case 3:
1826 if (data->flags & NFS_MOUNT_VER3)
1827 goto out_no_v3;
1828 data->root.size = NFS2_FHSIZE;
1829 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1830 case 4:
1831 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1832 goto out_no_sec;
1833 case 5:
1834 memset(data->context, 0, sizeof(data->context));
1835 case 6:
b7e24457
TM		 1836 if (data->flags & NFS_MOUNT_VER3) {
1837 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1838 goto out_invalid_fh;
5df36e78 1839 mntfh->size = data->root.size;
764302cc
CL		 1840 args->version = 3;
1841 } else {
5df36e78 1842 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1843 args->version = 2;
1844 }
5df36e78 1845
5df36e78
CL		 1846
1847 memcpy(mntfh->data, data->root.data, mntfh->size);
1848 if (mntfh->size < sizeof(mntfh->data))
1849 memset(mntfh->data + mntfh->size, 0,
1850 sizeof(mntfh->data) - mntfh->size);
6e88e061 1851
2283f8d6
TT		 1852 /*
1853 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1854 * can deal with.
1855 */
ff3525a5 1856 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1857 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1858 args->rsize = data->rsize;
1859 args->wsize = data->wsize;
2283f8d6
TT		 1860 args->timeo = data->timeo;
1861 args->retrans = data->retrans;
1862 args->acregmin = data->acregmin;
1863 args->acregmax = data->acregmax;
1864 args->acdirmin = data->acdirmin;
1865 args->acdirmax = data->acdirmax;
b72e4f42 1866 args->need_mount = false;
4c568017 1867
4cfd74fc 1868 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1869 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1870 if (!nfs_verify_server_address(sap))
4c568017
CL		 1871 goto out_no_address;
1872
2283f8d6 1873 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1874 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1875 /* N.B. caller will free nfs_server.hostname in all cases */
1876 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1877 args->namlen = data->namlen;
1878 args->bsize = data->bsize;
dd07c947
CL		 1879
1880 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1881 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1882 if (!args->nfs_server.hostname)
1883 goto out_nomem;
f9c3a380 1884
5eebde23
SJ		 1885 if (!(data->flags & NFS_MOUNT_NONLM))
1886 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1887 NFS_MOUNT_LOCAL_FCNTL);
1888 else
1889 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1890 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1891 /*
1892 * The legacy version 6 binary mount data from userspace has a
1893 * field used only to transport selinux information into the
1894 * the kernel. To continue to support that functionality we
1895 * have a touch of selinux knowledge here in the NFS code. The
1896 * userspace code converted context=blah to just blah so we are
1897 * converting back to the full string selinux understands.
1898 */
1899 if (data->context[0]){
1900#ifdef CONFIG_SECURITY_SELINUX
1901 int rc;
1902 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1903 if (!opts_str)
1904 return -ENOMEM;
1905 strcpy(opts_str, "context=");
1906 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1907 strcat(opts_str, &data->context[0]);
1908 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1909 kfree(opts_str);
1910 if (rc)
1911 return rc;
1912#else
1913 return -EINVAL;
1914#endif
1915 }
1916
5df36e78 1917 break;
b72e4f42
BS		 1918 default:
1919 return NFS_TEXT_DATA;
f7b422b1 1920 }
54ceac45 1921
1c606fb7 1922#if !IS_ENABLED(CONFIG_NFS_V3)
8a6e5deb 1923 if (args->version == 3)
5df36e78
CL		 1924 goto out_v3_not_compiled;
1925#endif /* !CONFIG_NFS_V3 */
f7b422b1 1926
5df36e78 1927 return 0;
f7b422b1 1928
5df36e78
CL		 1929out_no_data:
1930 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1931 return -EINVAL;
54ceac45 1932
5df36e78
CL		 1933out_no_v3:
1934 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1935 data->version);
1936 return -EINVAL;
f7b422b1 1937
5df36e78
CL		 1938out_no_sec:
1939 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1940 return -EINVAL;
1941
1c606fb7 1942#if !IS_ENABLED(CONFIG_NFS_V3)
5df36e78
CL		 1943out_v3_not_compiled:
1944 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1945 return -EPROTONOSUPPORT;
1946#endif /* !CONFIG_NFS_V3 */
1947
63649bd7
CG		 1948out_nomem:
1949 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1950 return -ENOMEM;
1951
5df36e78
CL		 1952out_no_address:
1953 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1954 return -EINVAL;
1955
1956out_invalid_fh:
1957 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1958 return -EINVAL;
f7b422b1
DH		 1959}
1960
89d77c8f 1961#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 1962static int nfs_validate_mount_data(struct file_system_type *fs_type,
1963 void *options,
1964 struct nfs_parsed_mount_data *args,
1965 struct nfs_fh *mntfh,
1966 const char *dev_name)
1967{
1968 if (fs_type == &nfs_fs_type)
1969 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1970 return nfs4_validate_mount_data(options, args, dev_name);
1971}
1972#else
1973static int nfs_validate_mount_data(struct file_system_type *fs_type,
1974 void *options,
1975 struct nfs_parsed_mount_data *args,
1976 struct nfs_fh *mntfh,
1977 const char *dev_name)
1978{
1979 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1980}
1981#endif
1982
b72e4f42
BS		 1983static int nfs_validate_text_mount_data(void *options,
1984 struct nfs_parsed_mount_data *args,
1985 const char *dev_name)
1986{
1987 int port = 0;
1988 int max_namelen = PAGE_SIZE;
1989 int max_pathlen = NFS_MAXPATHLEN;
1990 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1991
1992 if (nfs_parse_mount_options((char *)options, args) == 0)
1993 return -EINVAL;
1994
1995 if (!nfs_verify_server_address(sap))
1996 goto out_no_address;
1997
1998 if (args->version == 4) {
89d77c8f 1999#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2000 port = NFS_PORT;
2001 max_namelen = NFS4_MAXNAMLEN;
2002 max_pathlen = NFS4_MAXPATHLEN;
2003 nfs_validate_transport_protocol(args);
2004 nfs4_validate_mount_flags(args);
2005#else
2006 goto out_v4_not_compiled;
2007#endif /* CONFIG_NFS_V4 */
2008 } else
2009 nfs_set_mount_transport_protocol(args);
2010
2011 nfs_set_port(sap, &args->nfs_server.port, port);
2012
2013 if (args->auth_flavor_len > 1)
2014 goto out_bad_auth;
2015
2016 return nfs_parse_devname(dev_name,
2017 &args->nfs_server.hostname,
2018 max_namelen,
2019 &args->nfs_server.export_path,
2020 max_pathlen);
2021
89d77c8f 2022#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2023out_v4_not_compiled:
2024 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2025 return -EPROTONOSUPPORT;
2026#endif /* !CONFIG_NFS_V4 */
2027
2028out_no_address:
2029 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2030 return -EINVAL;
2031
2032out_bad_auth:
2033 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2034 return -EINVAL;
2035}
2036
48b605f8
JL		 2037static int
2038nfs_compare_remount_data(struct nfs_server *nfss,
2039 struct nfs_parsed_mount_data *data)
2040{
2041 if (data->flags != nfss->flags ||
2042 data->rsize != nfss->rsize ||
2043 data->wsize != nfss->wsize ||
2044 data->retrans != nfss->client->cl_timeout->to_retries ||
2045 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2046 data->acregmin != nfss->acregmin / HZ ||
2047 data->acregmax != nfss->acregmax / HZ ||
2048 data->acdirmin != nfss->acdirmin / HZ ||
2049 data->acdirmax != nfss->acdirmax / HZ ||
2050 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2051 data->nfs_server.port != nfss->port ||
48b605f8 2052 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2053 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2054 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2055 return -EINVAL;
2056
2057 return 0;
2058}
2059
fbdefd64 2060int
48b605f8
JL		 2061nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2062{
2063 int error;
2064 struct nfs_server *nfss = sb->s_fs_info;
2065 struct nfs_parsed_mount_data *data;
2066 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2067 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2068 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2069
2070 /*
2071 * Userspace mount programs that send binary options generally send
2072 * them populated with default values. We have no way to know which
2073 * ones were explicitly specified. Fall back to legacy behavior and
2074 * just return success.
2075 */
31c94469
MZ		 2076 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2077 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2078 options->version <= 6))))
48b605f8
JL		 2079 return 0;
2080
2081 data = kzalloc(sizeof(*data), GFP_KERNEL);
2082 if (data == NULL)
2083 return -ENOMEM;
2084
2085 /* fill out struct with values from existing mount */
2086 data->flags = nfss->flags;
2087 data->rsize = nfss->rsize;
2088 data->wsize = nfss->wsize;
2089 data->retrans = nfss->client->cl_timeout->to_retries;
2090 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2091 data->acregmin = nfss->acregmin / HZ;
2092 data->acregmax = nfss->acregmax / HZ;
2093 data->acdirmin = nfss->acdirmin / HZ;
2094 data->acdirmax = nfss->acdirmax / HZ;
2095 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2096 data->nfs_server.port = nfss->port;
48b605f8
JL		 2097 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2098 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2099 data->nfs_server.addrlen);
2100
2101 /* overwrite those values with any that were specified */
2102 error = nfs_parse_mount_options((char *)options, data);
2103 if (error < 0)
2104 goto out;
2105
26c4c170
JL		 2106 /*
2107 * noac is a special case. It implies -o sync, but that's not
2108 * necessarily reflected in the mtab options. do_remount_sb
2109 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2110 * remount options, so we have to explicitly reset it.
2111 */
2112 if (data->flags & NFS_MOUNT_NOAC)
2113 *flags |= MS_SYNCHRONOUS;
2114
48b605f8
JL		 2115 /* compare new mount options with old ones */
2116 error = nfs_compare_remount_data(nfss, data);
2117out:
2118 kfree(data);
2119 return error;
2120}
89d77c8f 2121EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2122
f7b422b1 2123/*
54ceac45 2124 * Initialise the common bits of the superblock
f7b422b1 2125 */
fbdefd64 2126inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2127{
54ceac45 2128 struct nfs_server *server = NFS_SB(sb);
5006a76c 2129
54ceac45 2130 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2131
54ceac45
DH		 2132 /* We probably want something more informative here */
2133 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2134 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2135
54ceac45
DH		 2136 if (sb->s_blocksize == 0)
2137 sb->s_blocksize = nfs_block_bits(server->wsize,
2138 &sb->s_blocksize_bits);
f7b422b1 2139
32a88aa1
JA		 2140 sb->s_bdi = &server->backing_dev_info;
2141
54ceac45 2142 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2143}
2144
2145/*
54ceac45 2146 * Finish setting up an NFS2/3 superblock
f7b422b1 2147 */
fbdefd64 2148void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2149{
c40f8d1d 2150 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2151 struct nfs_server *server = NFS_SB(sb);
5006a76c 2152
54ceac45
DH		 2153 sb->s_blocksize_bits = 0;
2154 sb->s_blocksize = 0;
6a74490d
BS		 2155 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2156 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2157 if (data && data->bsize)
54ceac45 2158 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2159
6a74490d 2160 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2161 /* The VFS shouldn't apply the umask to mode bits. We will do
2162 * so ourselves when necessary.
2163 */
2164 sb->s_flags |= MS_POSIXACL;
2165 sb->s_time_gran = 1;
816724e6 2166 }
54ceac45 2167
54ceac45 2168 nfs_initialise_sb(sb);
f7b422b1 2169}
89d77c8f 2170EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2171
2172/*
3cadf4b8 2173 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2174 */
fbdefd64 2175void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2176{
8c958e0c 2177 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2178 struct nfs_server *server = NFS_SB(sb);
2179
2180 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2181 sb->s_blocksize = old_sb->s_blocksize;
2182 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2183 sb->s_xattr = old_sb->s_xattr;
2184 sb->s_op = old_sb->s_op;
2185 sb->s_time_gran = 1;
f7b422b1 2186
3cadf4b8 2187 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2188 /* The VFS shouldn't apply the umask to mode bits. We will do
2189 * so ourselves when necessary.
f7b422b1
DH		 2190 */
2191 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2192 }
2193
54ceac45 2194 nfs_initialise_sb(sb);
f7b422b1
DH		 2195}
2196
275a5d24
TM		 2197static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2198{
2199 const struct nfs_server *a = s->s_fs_info;
2200 const struct rpc_clnt *clnt_a = a->client;
2201 const struct rpc_clnt *clnt_b = b->client;
2202
2203 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2204 goto Ebusy;
2205 if (a->nfs_client != b->nfs_client)
2206 goto Ebusy;
2207 if (a->flags != b->flags)
2208 goto Ebusy;
2209 if (a->wsize != b->wsize)
2210 goto Ebusy;
2211 if (a->rsize != b->rsize)
2212 goto Ebusy;
2213 if (a->acregmin != b->acregmin)
2214 goto Ebusy;
2215 if (a->acregmax != b->acregmax)
2216 goto Ebusy;
2217 if (a->acdirmin != b->acdirmin)
2218 goto Ebusy;
2219 if (a->acdirmax != b->acdirmax)
2220 goto Ebusy;
2221 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2222 goto Ebusy;
e89a5a43 2223 return 1;
275a5d24 2224Ebusy:
e89a5a43
TM		 2225 return 0;
2226}
2227
2228struct nfs_sb_mountdata {
2229 struct nfs_server *server;
2230 int mntflags;
2231};
2232
2233static int nfs_set_super(struct super_block *s, void *data)
2234{
2235 struct nfs_sb_mountdata *sb_mntdata = data;
2236 struct nfs_server *server = sb_mntdata->server;
2237 int ret;
2238
2239 s->s_flags = sb_mntdata->mntflags;
2240 s->s_fs_info = server;
8b244ff2 2241 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2242 ret = set_anon_super(s, server);
2243 if (ret == 0)
2244 server->s_dev = s->s_dev;
2245 return ret;
2246}
2247
fd00a8ff
CL		 2248static int nfs_compare_super_address(struct nfs_server *server1,
2249 struct nfs_server *server2)
2250{
2251 struct sockaddr *sap1, *sap2;
2252
2253 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2254 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2255
2256 if (sap1->sa_family != sap2->sa_family)
2257 return 0;
2258
2259 switch (sap1->sa_family) {
2260 case AF_INET: {
2261 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2262 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2263 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2264 return 0;
2265 if (sin1->sin_port != sin2->sin_port)
2266 return 0;
2267 break;
2268 }
2269 case AF_INET6: {
2270 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2271 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2272 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2273 return 0;
2274 if (sin1->sin6_port != sin2->sin6_port)
2275 return 0;
2276 break;
2277 }
2278 default:
2279 return 0;
2280 }
2281
2282 return 1;
2283}
2284
e89a5a43
TM		 2285static int nfs_compare_super(struct super_block *sb, void *data)
2286{
2287 struct nfs_sb_mountdata *sb_mntdata = data;
2288 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2289 int mntflags = sb_mntdata->mntflags;
2290
fd00a8ff 2291 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2292 return 0;
2293 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2294 if (old->flags & NFS_MOUNT_UNSHARED)
2295 return 0;
2296 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2297 return 0;
2298 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2299}
2300
39ffb921 2301#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2302static void nfs_get_cache_cookie(struct super_block *sb,
2303 struct nfs_parsed_mount_data *parsed,
2304 struct nfs_clone_mount *cloned)
2305{
2306 char *uniq = NULL;
2307 int ulen = 0;
2308
2309 if (parsed && parsed->fscache_uniq) {
2310 uniq = parsed->fscache_uniq;
2311 ulen = strlen(parsed->fscache_uniq);
2312 } else if (cloned) {
2313 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2314 if (mnt_s->fscache_key) {
2315 uniq = mnt_s->fscache_key->key.uniquifier;
2316 ulen = mnt_s->fscache_key->key.uniq_len;
2317 };
2318 }
2319
2320 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2321}
39ffb921
TM		 2322#else
2323static void nfs_get_cache_cookie(struct super_block *sb,
2324 struct nfs_parsed_mount_data *parsed,
2325 struct nfs_clone_mount *cloned)
2326{
2327}
2328#endif
2311b943 2329
fa799759
MS		 2330static int nfs_bdi_register(struct nfs_server *server)
2331{
2332 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2333}
2334
fbdefd64
BS		 2335int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2336 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2337{
2338 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2339}
89d77c8f 2340EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2341
fbdefd64
BS		 2342int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2343 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2344{
2345 /* clone any lsm security options from the parent to the new sb */
2346 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2347 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2348 return -ESTALE;
2349 return 0;
2350}
89d77c8f 2351EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2352
ab7017a3 2353struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2354 int flags, const char *dev_name,
ab7017a3
BS		 2355 struct nfs_mount_info *mount_info,
2356 struct nfs_subversion *nfs_mod)
f7b422b1 2357{
f7b422b1 2358 struct super_block *s;
01194981 2359 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2360 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2361 struct nfs_sb_mountdata sb_mntdata = {
2362 .mntflags = flags,
c40f8d1d 2363 .server = server,
e89a5a43 2364 };
01194981 2365 int error;
33852a1f 2366
75180df2
TM		 2367 if (server->flags & NFS_MOUNT_UNSHARED)
2368 compare_super = NULL;
2369
fb2088cc
SP		 2370 /* -o noac implies -o sync */
2371 if (server->flags & NFS_MOUNT_NOAC)
2372 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2373
54ceac45 2374 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2375 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2376 if (IS_ERR(s)) {
01194981 2377 mntroot = ERR_CAST(s);
54ceac45 2378 goto out_err_nosb;
816724e6
TM		 2379 }
2380
54ceac45
DH		 2381 if (s->s_fs_info != server) {
2382 nfs_free_server(server);
2383 server = NULL;
fa799759
MS		 2384 } else {
2385 error = nfs_bdi_register(server);
01194981
AV		 2386 if (error) {
2387 mntroot = ERR_PTR(error);
cfbc0683 2388 goto error_splat_bdi;
01194981 2389 }
54ceac45 2390 }
f7b422b1 2391
54ceac45
DH		 2392 if (!s->s_root) {
2393 /* initial superblock/root creation */
c40f8d1d 2394 mount_info->fill_super(s, mount_info);
3d176e3f 2395 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2396 }
f7b422b1 2397
87c7083d 2398 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2399 if (IS_ERR(mntroot))
54ceac45 2400 goto error_splat_super;
816724e6 2401
3d176e3f 2402 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2403 if (error)
2404 goto error_splat_root;
2405
54ceac45 2406 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2407
2408out:
01194981 2409 return mntroot;
816724e6 2410
54ceac45
DH		 2411out_err_nosb:
2412 nfs_free_server(server);
0655960f 2413 goto out;
54ceac45 2414
f9c3a380
EP		 2415error_splat_root:
2416 dput(mntroot);
01194981 2417 mntroot = ERR_PTR(error);
54ceac45 2418error_splat_super:
cfbc0683
N		 2419 if (server && !s->s_root)
2420 bdi_unregister(&server->backing_dev_info);
2421error_splat_bdi:
6f5bbff9 2422 deactivate_locked_super(s);
0655960f 2423 goto out;
f7b422b1 2424}
89d77c8f 2425EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2426
fbdefd64 2427struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2428 int flags, const char *dev_name, void *raw_data)
2429{
c40f8d1d
BS		 2430 struct nfs_mount_info mount_info = {
2431 .fill_super = nfs_fill_super,
3d176e3f 2432 .set_security = nfs_set_sb_security,
c40f8d1d 2433 };
c40f8d1d 2434 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2435 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2436 int error;
2437
46058d46 2438 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2439 mount_info.mntfh = nfs_alloc_fhandle();
2440 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2441 goto out;
2442
2443 /* Validate the mount data */
87c7083d 2444 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2445 if (error == NFS_TEXT_DATA)
46058d46 2446 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2447 if (error < 0) {
2448 mntroot = ERR_PTR(error);
2449 goto out;
2450 }
c40f8d1d 2451
ab7017a3
BS		 2452 nfs_mod = get_nfs_version(mount_info.parsed->version);
2453 if (IS_ERR(nfs_mod)) {
2454 mntroot = ERR_CAST(nfs_mod);
2455 goto out;
2456 }
2457
ff9099f2 2458 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2459
2460 put_nfs_version(nfs_mod);
c40f8d1d 2461out:
46058d46 2462 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2463 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2464 return mntroot;
2465}
89d77c8f 2466EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2467
387c149b
TM		 2468/*
2469 * Ensure that we unregister the bdi before kill_anon_super
2470 * releases the device name
2471 */
fbdefd64 2472void nfs_put_super(struct super_block *s)
387c149b
TM		 2473{
2474 struct nfs_server *server = NFS_SB(s);
2475
2476 bdi_unregister(&server->backing_dev_info);
2477}
89d77c8f 2478EXPORT_SYMBOL_GPL(nfs_put_super);
387c149b 2479
54ceac45
DH		 2480/*
2481 * Destroy an NFS2/3 superblock
2482 */
fbdefd64 2483void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2484{
2485 struct nfs_server *server = NFS_SB(s);
2486
2487 kill_anon_super(s);
08734048 2488 nfs_fscache_release_super_cookie(s);
54ceac45 2489 nfs_free_server(server);
f7b422b1 2490}
89d77c8f 2491EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2492
54ceac45 2493/*
8c958e0c 2494 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2495 */
fbdefd64 2496struct dentry *
e8f25e6d
BS		 2497nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2498 const char *dev_name, void *raw_data)
f7b422b1 2499{
e8f25e6d
BS		 2500 struct nfs_clone_mount *data = raw_data;
2501 struct nfs_mount_info mount_info = {
2502 .fill_super = nfs_clone_super,
2503 .set_security = nfs_clone_sb_security,
2504 .cloned = data,
2505 };
54ceac45 2506 struct nfs_server *server;
3d176e3f 2507 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2508 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
54ceac45 2509 int error;
f7b422b1 2510
8c958e0c 2511 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2512
e8f25e6d 2513 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2514
54ceac45 2515 /* create a new volume representation */
1179acc6 2516 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2517 if (IS_ERR(server)) {
2518 error = PTR_ERR(server);
3d176e3f 2519 goto out_err;
4c1fe2f7 2520 }
f7b422b1 2521
e8f25e6d 2522 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
8c958e0c 2523 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2524out:
31f43471 2525 return mntroot;
24c8dbbb 2526
3d176e3f 2527out_err:
8c958e0c 2528 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2529 goto out;
f7b422b1
DH		 2530}
2531
89d77c8f 2532#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2533
01c3f052
TM		 2534static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2535{
5eebde23
SJ		 2536 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2537 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2538}
2539
f0768ebd
CL		 2540/*
2541 * Validate NFSv4 mount options
2542 */
91ea40b9
TT		 2543static int nfs4_validate_mount_data(void *options,
2544 struct nfs_parsed_mount_data *args,
2545 const char *dev_name)
f0768ebd 2546{
4cfd74fc 2547 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2548 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2549 char *c;
2550
2551 if (data == NULL)
2552 goto out_no_data;
2553
cdf66442
BS		 2554 args->version = 4;
2555
f0768ebd
CL		 2556 switch (data->version) {
2557 case 1:
4c568017
CL		 2558 if (data->host_addrlen > sizeof(args->nfs_server.address))
2559 goto out_no_address;
2560 if (data->host_addrlen == 0)
f0768ebd 2561 goto out_no_address;
4c568017 2562 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2563 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2564 return -EFAULT;
4cfd74fc 2565 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2566 goto out_no_address;
2567
6738b251
CL		 2568 if (data->auth_flavourlen) {
2569 if (data->auth_flavourlen > 1)
2570 goto out_inval_auth;
20c71f5e 2571 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2572 data->auth_flavours,
20c71f5e 2573 sizeof(args->auth_flavors[0])))
f0768ebd 2574 return -EFAULT;
f0768ebd
CL		 2575 }
2576
2577 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2578 if (IS_ERR(c))
2579 return PTR_ERR(c);
91ea40b9 2580 args->nfs_server.hostname = c;
f0768ebd
CL		 2581
2582 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2583 if (IS_ERR(c))
2584 return PTR_ERR(c);
91ea40b9
TT		 2585 args->nfs_server.export_path = c;
2586 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2587
2588 c = strndup_user(data->client_addr.data, 16);
2589 if (IS_ERR(c))
2590 return PTR_ERR(c);
91ea40b9
TT		 2591 args->client_address = c;
2592
2593 /*
2594 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2595 * can deal with.
2596 */
2597
2598 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2599 args->rsize = data->rsize;
2600 args->wsize = data->wsize;
2601 args->timeo = data->timeo;
2602 args->retrans = data->retrans;
2603 args->acregmin = data->acregmin;
2604 args->acregmax = data->acregmax;
2605 args->acdirmin = data->acdirmin;
2606 args->acdirmax = data->acdirmax;
2607 args->nfs_server.protocol = data->proto;
259875ef 2608 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2609
2610 break;
7630c852 2611 default:
b72e4f42 2612 return NFS_TEXT_DATA;
f0768ebd
CL		 2613 }
2614
2615 return 0;
2616
2617out_no_data:
2618 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2619 return -EINVAL;
2620
2621out_inval_auth:
2622 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2623 data->auth_flavourlen);
2624 return -EINVAL;
2625
2626out_no_address:
2627 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2628 return -EINVAL;
f0768ebd
CL		 2629}
2630
fac1e8e4
BS		 2631/*
2632 * NFS v4 module parameters need to stay in the
2633 * NFS client for backwards compatibility
2634 */
2635unsigned int nfs_callback_set_tcpport;
2636unsigned short nfs_callback_tcpport;
2637/* Default cache timeout is 10 minutes */
2638unsigned int nfs_idmap_cache_timeout = 600;
2639/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2640bool nfs4_disable_idmapping = true;
2641unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2642unsigned short send_implementation_id = 1;
2643
89d77c8f
BS		 2644EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2645EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2646EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2647EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2648EXPORT_SYMBOL_GPL(max_session_slots);
2649EXPORT_SYMBOL_GPL(send_implementation_id);
2650
fac1e8e4
BS		 2651#define NFS_CALLBACK_MAXPORTNR (65535U)
2652
2653static int param_set_portnr(const char *val, const struct kernel_param *kp)
2654{
2655 unsigned long num;
2656 int ret;
2657
2658 if (!val)
2659 return -EINVAL;
2660 ret = strict_strtoul(val, 0, &num);
2661 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2662 return -EINVAL;
2663 *((unsigned int *)kp->arg) = num;
2664 return 0;
2665}
2666static struct kernel_param_ops param_ops_portnr = {
2667 .set = param_set_portnr,
2668 .get = param_get_uint,
2669};
2670#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2671
2672module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2673module_param(nfs_idmap_cache_timeout, int, 0644);
2674module_param(nfs4_disable_idmapping, bool, 0644);
2675MODULE_PARM_DESC(nfs4_disable_idmapping,
2676 "Turn off NFSv4 idmapping when using 'sec=sys'");
2677module_param(max_session_slots, ushort, 0644);
2678MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2679 "requests the client will negotiate");
2680module_param(send_implementation_id, ushort, 0644);
2681MODULE_PARM_DESC(send_implementation_id,
2682 "Send implementation ID with NFSv4.1 exchange_id");
54ceac45 2683#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)