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Merge tag 'for-v3.13-rc/hwmod-fixes-a' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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 *
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())
21 */
22
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/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
58
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"
66 #include "fscache.h"
67 #include "nfs4session.h"
68 #include "pnfs.h"
69 #include "nfs.h"
70
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
73
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
76 #else
77 #define NFS_DEFAULT_VERSION 2
78 #endif
79
80 enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
87 Opt_udp, Opt_tcp, Opt_rdma,
88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
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,
104 Opt_mountvers,
105 Opt_minorversion,
106
107 /* Mount options that take string arguments */
108 Opt_nfsvers,
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 Opt_lookupcache,
112 Opt_fscache_uniq,
113 Opt_local_lock,
114
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
117
118 Opt_err
119 };
120
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
125
126 { Opt_sloppy, "sloppy" },
127
128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
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" },
140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
142 { Opt_rdma, "rdma" },
143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
155
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" },
170 { Opt_minorversion, "minorversion=%s" },
171
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
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" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
182
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
186
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
190 { Opt_err, NULL }
191 };
192
193 enum {
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195
196 Opt_xprt_err
197 };
198
199 static const match_table_t nfs_xprt_protocol_tokens = {
200 { Opt_xprt_udp, "udp" },
201 { Opt_xprt_udp6, "udp6" },
202 { Opt_xprt_tcp, "tcp" },
203 { Opt_xprt_tcp6, "tcp6" },
204 { Opt_xprt_rdma, "rdma" },
205
206 { Opt_xprt_err, NULL }
207 };
208
209 enum {
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
218 static const match_table_t nfs_secflavor_tokens = {
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
231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
235 { Opt_sec_err, NULL }
236 };
237
238 enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243 };
244
245 static 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
254 enum {
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
261 static 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
270 enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1, Opt_vers_4_2,
273
274 Opt_vers_err
275 };
276
277 static 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 { Opt_vers_4_2, "4.2" },
284
285 { Opt_vers_err, NULL }
286 };
287
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
290
291 struct file_system_type nfs_fs_type = {
292 .owner = THIS_MODULE,
293 .name = "nfs",
294 .mount = nfs_fs_mount,
295 .kill_sb = nfs_kill_super,
296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
297 };
298 MODULE_ALIAS_FS("nfs");
299 EXPORT_SYMBOL_GPL(nfs_fs_type);
300
301 struct file_system_type nfs_xdev_fs_type = {
302 .owner = THIS_MODULE,
303 .name = "nfs",
304 .mount = nfs_xdev_mount,
305 .kill_sb = nfs_kill_super,
306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
307 };
308
309 const struct super_operations nfs_sops = {
310 .alloc_inode = nfs_alloc_inode,
311 .destroy_inode = nfs_destroy_inode,
312 .write_inode = nfs_write_inode,
313 .drop_inode = nfs_drop_inode,
314 .put_super = nfs_put_super,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
323 };
324 EXPORT_SYMBOL_GPL(nfs_sops);
325
326 #if IS_ENABLED(CONFIG_NFS_V4)
327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
328 static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
330
331 struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337 };
338 MODULE_ALIAS_FS("nfs4");
339 MODULE_ALIAS("nfs4");
340 EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342 static int __init register_nfs4_fs(void)
343 {
344 return register_filesystem(&nfs4_fs_type);
345 }
346
347 static void unregister_nfs4_fs(void)
348 {
349 unregister_filesystem(&nfs4_fs_type);
350 }
351 #else
352 static int __init register_nfs4_fs(void)
353 {
354 return 0;
355 }
356
357 static void unregister_nfs4_fs(void)
358 {
359 }
360 #endif
361
362 static struct shrinker acl_shrinker = {
363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
365 .seeks = DEFAULT_SEEKS,
366 };
367
368 /*
369 * Register the NFS filesystems
370 */
371 int __init register_nfs_fs(void)
372 {
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
379 ret = register_nfs4_fs();
380 if (ret < 0)
381 goto error_1;
382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
386 register_shrinker(&acl_shrinker);
387 return 0;
388
389 error_2:
390 unregister_nfs4_fs();
391 error_1:
392 unregister_filesystem(&nfs_fs_type);
393 error_0:
394 return ret;
395 }
396
397 /*
398 * Unregister the NFS filesystems
399 */
400 void __exit unregister_nfs_fs(void)
401 {
402 unregister_shrinker(&acl_shrinker);
403 nfs_unregister_sysctl();
404 unregister_nfs4_fs();
405 unregister_filesystem(&nfs_fs_type);
406 }
407
408 void nfs_sb_active(struct super_block *sb)
409 {
410 struct nfs_server *server = NFS_SB(sb);
411
412 if (atomic_inc_return(&server->active) == 1)
413 atomic_inc(&sb->s_active);
414 }
415 EXPORT_SYMBOL_GPL(nfs_sb_active);
416
417 void nfs_sb_deactive(struct super_block *sb)
418 {
419 struct nfs_server *server = NFS_SB(sb);
420
421 if (atomic_dec_and_test(&server->active))
422 deactivate_super(sb);
423 }
424 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
425
426 /*
427 * Deliver file system statistics to userspace
428 */
429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
430 {
431 struct nfs_server *server = NFS_SB(dentry->d_sb);
432 unsigned char blockbits;
433 unsigned long blockres;
434 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
435 struct nfs_fsstat res;
436 int error = -ENOMEM;
437
438 res.fattr = nfs_alloc_fattr();
439 if (res.fattr == NULL)
440 goto out_err;
441
442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
443 if (unlikely(error == -ESTALE)) {
444 struct dentry *pd_dentry;
445
446 pd_dentry = dget_parent(dentry);
447 if (pd_dentry != NULL) {
448 nfs_zap_caches(pd_dentry->d_inode);
449 dput(pd_dentry);
450 }
451 }
452 nfs_free_fattr(res.fattr);
453 if (error < 0)
454 goto out_err;
455
456 buf->f_type = NFS_SUPER_MAGIC;
457
458 /*
459 * Current versions of glibc do not correctly handle the
460 * case where f_frsize != f_bsize. Eventually we want to
461 * report the value of wtmult in this field.
462 */
463 buf->f_frsize = dentry->d_sb->s_blocksize;
464
465 /*
466 * On most *nix systems, f_blocks, f_bfree, and f_bavail
467 * are reported in units of f_frsize. Linux hasn't had
468 * an f_frsize field in its statfs struct until recently,
469 * thus historically Linux's sys_statfs reports these
470 * fields in units of f_bsize.
471 */
472 buf->f_bsize = dentry->d_sb->s_blocksize;
473 blockbits = dentry->d_sb->s_blocksize_bits;
474 blockres = (1 << blockbits) - 1;
475 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
476 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
477 buf->f_bavail = (res.abytes + blockres) >> blockbits;
478
479 buf->f_files = res.tfiles;
480 buf->f_ffree = res.afiles;
481
482 buf->f_namelen = server->namelen;
483
484 return 0;
485
486 out_err:
487 dprintk("%s: statfs error = %d\n", __func__, -error);
488 return error;
489 }
490 EXPORT_SYMBOL_GPL(nfs_statfs);
491
492 /*
493 * Map the security flavour number to a name
494 */
495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
496 {
497 static const struct {
498 rpc_authflavor_t flavour;
499 const char *str;
500 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
501 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
502 { RPC_AUTH_NULL, "null" },
503 { RPC_AUTH_UNIX, "sys" },
504 { RPC_AUTH_GSS_KRB5, "krb5" },
505 { RPC_AUTH_GSS_KRB5I, "krb5i" },
506 { RPC_AUTH_GSS_KRB5P, "krb5p" },
507 { RPC_AUTH_GSS_LKEY, "lkey" },
508 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
509 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
510 { RPC_AUTH_GSS_SPKM, "spkm" },
511 { RPC_AUTH_GSS_SPKMI, "spkmi" },
512 { RPC_AUTH_GSS_SPKMP, "spkmp" },
513 { UINT_MAX, "unknown" }
514 };
515 int i;
516
517 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
518 if (sec_flavours[i].flavour == flavour)
519 break;
520 }
521 return sec_flavours[i].str;
522 }
523
524 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
525 int showdefaults)
526 {
527 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
528
529 seq_printf(m, ",mountproto=");
530 switch (sap->sa_family) {
531 case AF_INET:
532 switch (nfss->mountd_protocol) {
533 case IPPROTO_UDP:
534 seq_printf(m, RPCBIND_NETID_UDP);
535 break;
536 case IPPROTO_TCP:
537 seq_printf(m, RPCBIND_NETID_TCP);
538 break;
539 default:
540 if (showdefaults)
541 seq_printf(m, "auto");
542 }
543 break;
544 case AF_INET6:
545 switch (nfss->mountd_protocol) {
546 case IPPROTO_UDP:
547 seq_printf(m, RPCBIND_NETID_UDP6);
548 break;
549 case IPPROTO_TCP:
550 seq_printf(m, RPCBIND_NETID_TCP6);
551 break;
552 default:
553 if (showdefaults)
554 seq_printf(m, "auto");
555 }
556 break;
557 default:
558 if (showdefaults)
559 seq_printf(m, "auto");
560 }
561 }
562
563 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
564 int showdefaults)
565 {
566 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
567
568 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
569 return;
570
571 switch (sap->sa_family) {
572 case AF_INET: {
573 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
574 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
575 break;
576 }
577 case AF_INET6: {
578 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
579 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
580 break;
581 }
582 default:
583 if (showdefaults)
584 seq_printf(m, ",mountaddr=unspecified");
585 }
586
587 if (nfss->mountd_version || showdefaults)
588 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
589 if ((nfss->mountd_port &&
590 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
591 showdefaults)
592 seq_printf(m, ",mountport=%u", nfss->mountd_port);
593
594 nfs_show_mountd_netid(m, nfss, showdefaults);
595 }
596
597 #if IS_ENABLED(CONFIG_NFS_V4)
598 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
599 int showdefaults)
600 {
601 struct nfs_client *clp = nfss->nfs_client;
602
603 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
604 }
605 #else
606 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
607 int showdefaults)
608 {
609 }
610 #endif
611
612 static void nfs_show_nfs_version(struct seq_file *m,
613 unsigned int version,
614 unsigned int minorversion)
615 {
616 seq_printf(m, ",vers=%u", version);
617 if (version == 4)
618 seq_printf(m, ".%u", minorversion);
619 }
620
621 /*
622 * Describe the mount options in force on this server representation
623 */
624 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
625 int showdefaults)
626 {
627 static const struct proc_nfs_info {
628 int flag;
629 const char *str;
630 const char *nostr;
631 } nfs_info[] = {
632 { NFS_MOUNT_SOFT, ",soft", ",hard" },
633 { NFS_MOUNT_POSIX, ",posix", "" },
634 { NFS_MOUNT_NOCTO, ",nocto", "" },
635 { NFS_MOUNT_NOAC, ",noac", "" },
636 { NFS_MOUNT_NONLM, ",nolock", "" },
637 { NFS_MOUNT_NOACL, ",noacl", "" },
638 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
639 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
640 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
641 { 0, NULL, NULL }
642 };
643 const struct proc_nfs_info *nfs_infop;
644 struct nfs_client *clp = nfss->nfs_client;
645 u32 version = clp->rpc_ops->version;
646 int local_flock, local_fcntl;
647
648 nfs_show_nfs_version(m, version, clp->cl_minorversion);
649 seq_printf(m, ",rsize=%u", nfss->rsize);
650 seq_printf(m, ",wsize=%u", nfss->wsize);
651 if (nfss->bsize != 0)
652 seq_printf(m, ",bsize=%u", nfss->bsize);
653 seq_printf(m, ",namlen=%u", nfss->namelen);
654 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
655 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
656 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
657 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
658 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
659 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
660 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
661 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
662 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
663 if (nfss->flags & nfs_infop->flag)
664 seq_puts(m, nfs_infop->str);
665 else
666 seq_puts(m, nfs_infop->nostr);
667 }
668 rcu_read_lock();
669 seq_printf(m, ",proto=%s",
670 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
671 rcu_read_unlock();
672 if (version == 4) {
673 if (nfss->port != NFS_PORT)
674 seq_printf(m, ",port=%u", nfss->port);
675 } else
676 if (nfss->port)
677 seq_printf(m, ",port=%u", nfss->port);
678
679 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
680 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
681 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
682
683 if (version != 4)
684 nfs_show_mountd_options(m, nfss, showdefaults);
685 else
686 nfs_show_nfsv4_options(m, nfss, showdefaults);
687
688 if (nfss->options & NFS_OPTION_FSCACHE)
689 seq_printf(m, ",fsc");
690
691 if (nfss->options & NFS_OPTION_MIGRATION)
692 seq_printf(m, ",migration");
693
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
695 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
696 seq_printf(m, ",lookupcache=none");
697 else
698 seq_printf(m, ",lookupcache=pos");
699 }
700
701 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
702 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
703
704 if (!local_flock && !local_fcntl)
705 seq_printf(m, ",local_lock=none");
706 else if (local_flock && local_fcntl)
707 seq_printf(m, ",local_lock=all");
708 else if (local_flock)
709 seq_printf(m, ",local_lock=flock");
710 else
711 seq_printf(m, ",local_lock=posix");
712 }
713
714 /*
715 * Describe the mount options on this VFS mountpoint
716 */
717 int nfs_show_options(struct seq_file *m, struct dentry *root)
718 {
719 struct nfs_server *nfss = NFS_SB(root->d_sb);
720
721 nfs_show_mount_options(m, nfss, 0);
722
723 rcu_read_lock();
724 seq_printf(m, ",addr=%s",
725 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
726 RPC_DISPLAY_ADDR));
727 rcu_read_unlock();
728
729 return 0;
730 }
731 EXPORT_SYMBOL_GPL(nfs_show_options);
732
733 #if IS_ENABLED(CONFIG_NFS_V4)
734 #ifdef CONFIG_NFS_V4_1
735 static void show_sessions(struct seq_file *m, struct nfs_server *server)
736 {
737 if (nfs4_has_session(server->nfs_client))
738 seq_printf(m, ",sessions");
739 }
740 #else
741 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
742 #endif
743 #endif
744
745 #ifdef CONFIG_NFS_V4_1
746 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
747 {
748 seq_printf(m, ",pnfs=");
749 if (server->pnfs_curr_ld)
750 seq_printf(m, "%s", server->pnfs_curr_ld->name);
751 else
752 seq_printf(m, "not configured");
753 }
754
755 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
756 {
757 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
758 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
759 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
760 "date='%llu,%u'",
761 impl_id->name, impl_id->domain,
762 impl_id->date.seconds, impl_id->date.nseconds);
763 }
764 }
765 #else
766 #if IS_ENABLED(CONFIG_NFS_V4)
767 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
768 {
769 }
770 #endif
771 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
772 {
773 }
774 #endif
775
776 int nfs_show_devname(struct seq_file *m, struct dentry *root)
777 {
778 char *page = (char *) __get_free_page(GFP_KERNEL);
779 char *devname, *dummy;
780 int err = 0;
781 if (!page)
782 return -ENOMEM;
783 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
784 if (IS_ERR(devname))
785 err = PTR_ERR(devname);
786 else
787 seq_escape(m, devname, " \t\n\\");
788 free_page((unsigned long)page);
789 return err;
790 }
791 EXPORT_SYMBOL_GPL(nfs_show_devname);
792
793 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
794 {
795 seq_puts(m, "/");
796 return 0;
797 }
798 EXPORT_SYMBOL_GPL(nfs_show_path);
799
800 /*
801 * Present statistical information for this VFS mountpoint
802 */
803 int nfs_show_stats(struct seq_file *m, struct dentry *root)
804 {
805 int i, cpu;
806 struct nfs_server *nfss = NFS_SB(root->d_sb);
807 struct rpc_auth *auth = nfss->client->cl_auth;
808 struct nfs_iostats totals = { };
809
810 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
811
812 /*
813 * Display all mount option settings
814 */
815 seq_printf(m, "\n\topts:\t");
816 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
817 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
819 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
820 nfs_show_mount_options(m, nfss, 1);
821
822 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
823
824 show_implementation_id(m, nfss);
825
826 seq_printf(m, "\n\tcaps:\t");
827 seq_printf(m, "caps=0x%x", nfss->caps);
828 seq_printf(m, ",wtmult=%u", nfss->wtmult);
829 seq_printf(m, ",dtsize=%u", nfss->dtsize);
830 seq_printf(m, ",bsize=%u", nfss->bsize);
831 seq_printf(m, ",namlen=%u", nfss->namelen);
832
833 #if IS_ENABLED(CONFIG_NFS_V4)
834 if (nfss->nfs_client->rpc_ops->version == 4) {
835 seq_printf(m, "\n\tnfsv4:\t");
836 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
837 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
838 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
839 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
840 show_sessions(m, nfss);
841 show_pnfs(m, nfss);
842 }
843 #endif
844
845 /*
846 * Display security flavor in effect for this mount
847 */
848 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
849 if (auth->au_flavor)
850 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
851
852 /*
853 * Display superblock I/O counters
854 */
855 for_each_possible_cpu(cpu) {
856 struct nfs_iostats *stats;
857
858 preempt_disable();
859 stats = per_cpu_ptr(nfss->io_stats, cpu);
860
861 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
862 totals.events[i] += stats->events[i];
863 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
864 totals.bytes[i] += stats->bytes[i];
865 #ifdef CONFIG_NFS_FSCACHE
866 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
867 totals.fscache[i] += stats->fscache[i];
868 #endif
869
870 preempt_enable();
871 }
872
873 seq_printf(m, "\n\tevents:\t");
874 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
875 seq_printf(m, "%lu ", totals.events[i]);
876 seq_printf(m, "\n\tbytes:\t");
877 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
878 seq_printf(m, "%Lu ", totals.bytes[i]);
879 #ifdef CONFIG_NFS_FSCACHE
880 if (nfss->options & NFS_OPTION_FSCACHE) {
881 seq_printf(m, "\n\tfsc:\t");
882 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
883 seq_printf(m, "%Lu ", totals.bytes[i]);
884 }
885 #endif
886 seq_printf(m, "\n");
887
888 rpc_print_iostats(m, nfss->client);
889
890 return 0;
891 }
892 EXPORT_SYMBOL_GPL(nfs_show_stats);
893
894 /*
895 * Begin unmount by attempting to remove all automounted mountpoints we added
896 * in response to xdev traversals and referrals
897 */
898 void nfs_umount_begin(struct super_block *sb)
899 {
900 struct nfs_server *server;
901 struct rpc_clnt *rpc;
902
903 server = NFS_SB(sb);
904 /* -EIO all pending I/O */
905 rpc = server->client_acl;
906 if (!IS_ERR(rpc))
907 rpc_killall_tasks(rpc);
908 rpc = server->client;
909 if (!IS_ERR(rpc))
910 rpc_killall_tasks(rpc);
911 }
912 EXPORT_SYMBOL_GPL(nfs_umount_begin);
913
914 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
915 {
916 struct nfs_parsed_mount_data *data;
917
918 data = kzalloc(sizeof(*data), GFP_KERNEL);
919 if (data) {
920 data->acregmin = NFS_DEF_ACREGMIN;
921 data->acregmax = NFS_DEF_ACREGMAX;
922 data->acdirmin = NFS_DEF_ACDIRMIN;
923 data->acdirmax = NFS_DEF_ACDIRMAX;
924 data->mount_server.port = NFS_UNSPEC_PORT;
925 data->nfs_server.port = NFS_UNSPEC_PORT;
926 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
927 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
928 data->minorversion = 0;
929 data->need_mount = true;
930 data->net = current->nsproxy->net_ns;
931 security_init_mnt_opts(&data->lsm_opts);
932 }
933 return data;
934 }
935
936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
937 {
938 if (data) {
939 kfree(data->client_address);
940 kfree(data->mount_server.hostname);
941 kfree(data->nfs_server.export_path);
942 kfree(data->nfs_server.hostname);
943 kfree(data->fscache_uniq);
944 security_free_mnt_opts(&data->lsm_opts);
945 kfree(data);
946 }
947 }
948
949 /*
950 * Sanity-check a server address provided by the mount command.
951 *
952 * Address family must be initialized, and address must not be
953 * the ANY address for that family.
954 */
955 static int nfs_verify_server_address(struct sockaddr *addr)
956 {
957 switch (addr->sa_family) {
958 case AF_INET: {
959 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
960 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
961 }
962 case AF_INET6: {
963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
964 return !ipv6_addr_any(sa);
965 }
966 }
967
968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
969 return 0;
970 }
971
972 /*
973 * Select between a default port value and a user-specified port value.
974 * If a zero value is set, then autobind will be used.
975 */
976 static void nfs_set_port(struct sockaddr *sap, int *port,
977 const unsigned short default_port)
978 {
979 if (*port == NFS_UNSPEC_PORT)
980 *port = default_port;
981
982 rpc_set_port(sap, *port);
983 }
984
985 /*
986 * Sanity check the NFS transport protocol.
987 *
988 */
989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
990 {
991 switch (mnt->nfs_server.protocol) {
992 case XPRT_TRANSPORT_UDP:
993 case XPRT_TRANSPORT_TCP:
994 case XPRT_TRANSPORT_RDMA:
995 break;
996 default:
997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
998 }
999 }
1000
1001 /*
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1004 */
1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006 {
1007 nfs_validate_transport_protocol(mnt);
1008
1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011 return;
1012 switch (mnt->nfs_server.protocol) {
1013 case XPRT_TRANSPORT_UDP:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015 break;
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1019 }
1020 }
1021
1022 /*
1023 * Add 'flavor' to 'auth_info' if not already present.
1024 * Returns true if 'flavor' ends up in the list, false otherwise
1025 */
1026 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1027 rpc_authflavor_t flavor)
1028 {
1029 unsigned int i;
1030 unsigned int max_flavor_len = (sizeof(auth_info->flavors) /
1031 sizeof(auth_info->flavors[0]));
1032
1033 /* make sure this flavor isn't already in the list */
1034 for (i = 0; i < auth_info->flavor_len; i++) {
1035 if (flavor == auth_info->flavors[i])
1036 return true;
1037 }
1038
1039 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1040 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1041 return false;
1042 }
1043
1044 auth_info->flavors[auth_info->flavor_len++] = flavor;
1045 return true;
1046 }
1047
1048 /*
1049 * Return true if 'match' is in auth_info or auth_info is empty.
1050 * Return false otherwise.
1051 */
1052 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1053 rpc_authflavor_t match)
1054 {
1055 int i;
1056
1057 if (!auth_info->flavor_len)
1058 return true;
1059
1060 for (i = 0; i < auth_info->flavor_len; i++) {
1061 if (auth_info->flavors[i] == match)
1062 return true;
1063 }
1064 return false;
1065 }
1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067
1068 /*
1069 * Parse the value of the 'sec=' option.
1070 */
1071 static int nfs_parse_security_flavors(char *value,
1072 struct nfs_parsed_mount_data *mnt)
1073 {
1074 substring_t args[MAX_OPT_ARGS];
1075 rpc_authflavor_t pseudoflavor;
1076 char *p;
1077
1078 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1079
1080 while ((p = strsep(&value, ":")) != NULL) {
1081 switch (match_token(p, nfs_secflavor_tokens, args)) {
1082 case Opt_sec_none:
1083 pseudoflavor = RPC_AUTH_NULL;
1084 break;
1085 case Opt_sec_sys:
1086 pseudoflavor = RPC_AUTH_UNIX;
1087 break;
1088 case Opt_sec_krb5:
1089 pseudoflavor = RPC_AUTH_GSS_KRB5;
1090 break;
1091 case Opt_sec_krb5i:
1092 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093 break;
1094 case Opt_sec_krb5p:
1095 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096 break;
1097 case Opt_sec_lkey:
1098 pseudoflavor = RPC_AUTH_GSS_LKEY;
1099 break;
1100 case Opt_sec_lkeyi:
1101 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102 break;
1103 case Opt_sec_lkeyp:
1104 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105 break;
1106 case Opt_sec_spkm:
1107 pseudoflavor = RPC_AUTH_GSS_SPKM;
1108 break;
1109 case Opt_sec_spkmi:
1110 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111 break;
1112 case Opt_sec_spkmp:
1113 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1114 break;
1115 default:
1116 dfprintk(MOUNT,
1117 "NFS: sec= option '%s' not recognized\n", p);
1118 return 0;
1119 }
1120
1121 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1122 return 0;
1123 }
1124
1125 return 1;
1126 }
1127
1128 static int nfs_parse_version_string(char *string,
1129 struct nfs_parsed_mount_data *mnt,
1130 substring_t *args)
1131 {
1132 mnt->flags &= ~NFS_MOUNT_VER3;
1133 switch (match_token(string, nfs_vers_tokens, args)) {
1134 case Opt_vers_2:
1135 mnt->version = 2;
1136 break;
1137 case Opt_vers_3:
1138 mnt->flags |= NFS_MOUNT_VER3;
1139 mnt->version = 3;
1140 break;
1141 case Opt_vers_4:
1142 /* Backward compatibility option. In future,
1143 * the mount program should always supply
1144 * a NFSv4 minor version number.
1145 */
1146 mnt->version = 4;
1147 break;
1148 case Opt_vers_4_0:
1149 mnt->version = 4;
1150 mnt->minorversion = 0;
1151 break;
1152 case Opt_vers_4_1:
1153 mnt->version = 4;
1154 mnt->minorversion = 1;
1155 break;
1156 case Opt_vers_4_2:
1157 mnt->version = 4;
1158 mnt->minorversion = 2;
1159 break;
1160 default:
1161 return 0;
1162 }
1163 return 1;
1164 }
1165
1166 static int nfs_get_option_str(substring_t args[], char **option)
1167 {
1168 kfree(*option);
1169 *option = match_strdup(args);
1170 return !*option;
1171 }
1172
1173 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1174 {
1175 int rc;
1176 char *string;
1177
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 return -ENOMEM;
1181 rc = kstrtoul(string, 10, option);
1182 kfree(string);
1183
1184 return rc;
1185 }
1186
1187 /*
1188 * Error-check and convert a string of mount options from user space into
1189 * a data structure. The whole mount string is processed; bad options are
1190 * skipped as they are encountered. If there were no errors, return 1;
1191 * otherwise return 0 (zero).
1192 */
1193 static int nfs_parse_mount_options(char *raw,
1194 struct nfs_parsed_mount_data *mnt)
1195 {
1196 char *p, *string, *secdata;
1197 int rc, sloppy = 0, invalid_option = 0;
1198 unsigned short protofamily = AF_UNSPEC;
1199 unsigned short mountfamily = AF_UNSPEC;
1200
1201 if (!raw) {
1202 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1203 return 1;
1204 }
1205 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1206
1207 secdata = alloc_secdata();
1208 if (!secdata)
1209 goto out_nomem;
1210
1211 rc = security_sb_copy_data(raw, secdata);
1212 if (rc)
1213 goto out_security_failure;
1214
1215 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1216 if (rc)
1217 goto out_security_failure;
1218
1219 free_secdata(secdata);
1220
1221 while ((p = strsep(&raw, ",")) != NULL) {
1222 substring_t args[MAX_OPT_ARGS];
1223 unsigned long option;
1224 int token;
1225
1226 if (!*p)
1227 continue;
1228
1229 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1230
1231 token = match_token(p, nfs_mount_option_tokens, args);
1232 switch (token) {
1233
1234 /*
1235 * boolean options: foo/nofoo
1236 */
1237 case Opt_soft:
1238 mnt->flags |= NFS_MOUNT_SOFT;
1239 break;
1240 case Opt_hard:
1241 mnt->flags &= ~NFS_MOUNT_SOFT;
1242 break;
1243 case Opt_posix:
1244 mnt->flags |= NFS_MOUNT_POSIX;
1245 break;
1246 case Opt_noposix:
1247 mnt->flags &= ~NFS_MOUNT_POSIX;
1248 break;
1249 case Opt_cto:
1250 mnt->flags &= ~NFS_MOUNT_NOCTO;
1251 break;
1252 case Opt_nocto:
1253 mnt->flags |= NFS_MOUNT_NOCTO;
1254 break;
1255 case Opt_ac:
1256 mnt->flags &= ~NFS_MOUNT_NOAC;
1257 break;
1258 case Opt_noac:
1259 mnt->flags |= NFS_MOUNT_NOAC;
1260 break;
1261 case Opt_lock:
1262 mnt->flags &= ~NFS_MOUNT_NONLM;
1263 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1264 NFS_MOUNT_LOCAL_FCNTL);
1265 break;
1266 case Opt_nolock:
1267 mnt->flags |= NFS_MOUNT_NONLM;
1268 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1269 NFS_MOUNT_LOCAL_FCNTL);
1270 break;
1271 case Opt_udp:
1272 mnt->flags &= ~NFS_MOUNT_TCP;
1273 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1274 break;
1275 case Opt_tcp:
1276 mnt->flags |= NFS_MOUNT_TCP;
1277 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1278 break;
1279 case Opt_rdma:
1280 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1281 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1282 xprt_load_transport(p);
1283 break;
1284 case Opt_acl:
1285 mnt->flags &= ~NFS_MOUNT_NOACL;
1286 break;
1287 case Opt_noacl:
1288 mnt->flags |= NFS_MOUNT_NOACL;
1289 break;
1290 case Opt_rdirplus:
1291 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1292 break;
1293 case Opt_nordirplus:
1294 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1295 break;
1296 case Opt_sharecache:
1297 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1298 break;
1299 case Opt_nosharecache:
1300 mnt->flags |= NFS_MOUNT_UNSHARED;
1301 break;
1302 case Opt_resvport:
1303 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1304 break;
1305 case Opt_noresvport:
1306 mnt->flags |= NFS_MOUNT_NORESVPORT;
1307 break;
1308 case Opt_fscache:
1309 mnt->options |= NFS_OPTION_FSCACHE;
1310 kfree(mnt->fscache_uniq);
1311 mnt->fscache_uniq = NULL;
1312 break;
1313 case Opt_nofscache:
1314 mnt->options &= ~NFS_OPTION_FSCACHE;
1315 kfree(mnt->fscache_uniq);
1316 mnt->fscache_uniq = NULL;
1317 break;
1318 case Opt_migration:
1319 mnt->options |= NFS_OPTION_MIGRATION;
1320 break;
1321 case Opt_nomigration:
1322 mnt->options &= NFS_OPTION_MIGRATION;
1323 break;
1324
1325 /*
1326 * options that take numeric values
1327 */
1328 case Opt_port:
1329 if (nfs_get_option_ul(args, &option) ||
1330 option > USHRT_MAX)
1331 goto out_invalid_value;
1332 mnt->nfs_server.port = option;
1333 break;
1334 case Opt_rsize:
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->rsize = option;
1338 break;
1339 case Opt_wsize:
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 mnt->wsize = option;
1343 break;
1344 case Opt_bsize:
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->bsize = option;
1348 break;
1349 case Opt_timeo:
1350 if (nfs_get_option_ul(args, &option) || option == 0)
1351 goto out_invalid_value;
1352 mnt->timeo = option;
1353 break;
1354 case Opt_retrans:
1355 if (nfs_get_option_ul(args, &option) || option == 0)
1356 goto out_invalid_value;
1357 mnt->retrans = option;
1358 break;
1359 case Opt_acregmin:
1360 if (nfs_get_option_ul(args, &option))
1361 goto out_invalid_value;
1362 mnt->acregmin = option;
1363 break;
1364 case Opt_acregmax:
1365 if (nfs_get_option_ul(args, &option))
1366 goto out_invalid_value;
1367 mnt->acregmax = option;
1368 break;
1369 case Opt_acdirmin:
1370 if (nfs_get_option_ul(args, &option))
1371 goto out_invalid_value;
1372 mnt->acdirmin = option;
1373 break;
1374 case Opt_acdirmax:
1375 if (nfs_get_option_ul(args, &option))
1376 goto out_invalid_value;
1377 mnt->acdirmax = option;
1378 break;
1379 case Opt_actimeo:
1380 if (nfs_get_option_ul(args, &option))
1381 goto out_invalid_value;
1382 mnt->acregmin = mnt->acregmax =
1383 mnt->acdirmin = mnt->acdirmax = option;
1384 break;
1385 case Opt_namelen:
1386 if (nfs_get_option_ul(args, &option))
1387 goto out_invalid_value;
1388 mnt->namlen = option;
1389 break;
1390 case Opt_mountport:
1391 if (nfs_get_option_ul(args, &option) ||
1392 option > USHRT_MAX)
1393 goto out_invalid_value;
1394 mnt->mount_server.port = option;
1395 break;
1396 case Opt_mountvers:
1397 if (nfs_get_option_ul(args, &option) ||
1398 option < NFS_MNT_VERSION ||
1399 option > NFS_MNT3_VERSION)
1400 goto out_invalid_value;
1401 mnt->mount_server.version = option;
1402 break;
1403 case Opt_minorversion:
1404 if (nfs_get_option_ul(args, &option))
1405 goto out_invalid_value;
1406 if (option > NFS4_MAX_MINOR_VERSION)
1407 goto out_invalid_value;
1408 mnt->minorversion = option;
1409 break;
1410
1411 /*
1412 * options that take text values
1413 */
1414 case Opt_nfsvers:
1415 string = match_strdup(args);
1416 if (string == NULL)
1417 goto out_nomem;
1418 rc = nfs_parse_version_string(string, mnt, args);
1419 kfree(string);
1420 if (!rc)
1421 goto out_invalid_value;
1422 break;
1423 case Opt_sec:
1424 string = match_strdup(args);
1425 if (string == NULL)
1426 goto out_nomem;
1427 rc = nfs_parse_security_flavors(string, mnt);
1428 kfree(string);
1429 if (!rc) {
1430 dfprintk(MOUNT, "NFS: unrecognized "
1431 "security flavor\n");
1432 return 0;
1433 }
1434 break;
1435 case Opt_proto:
1436 string = match_strdup(args);
1437 if (string == NULL)
1438 goto out_nomem;
1439 token = match_token(string,
1440 nfs_xprt_protocol_tokens, args);
1441
1442 protofamily = AF_INET;
1443 switch (token) {
1444 case Opt_xprt_udp6:
1445 protofamily = AF_INET6;
1446 case Opt_xprt_udp:
1447 mnt->flags &= ~NFS_MOUNT_TCP;
1448 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1449 break;
1450 case Opt_xprt_tcp6:
1451 protofamily = AF_INET6;
1452 case Opt_xprt_tcp:
1453 mnt->flags |= NFS_MOUNT_TCP;
1454 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1455 break;
1456 case Opt_xprt_rdma:
1457 /* vector side protocols to TCP */
1458 mnt->flags |= NFS_MOUNT_TCP;
1459 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1460 xprt_load_transport(string);
1461 break;
1462 default:
1463 dfprintk(MOUNT, "NFS: unrecognized "
1464 "transport protocol\n");
1465 kfree(string);
1466 return 0;
1467 }
1468 kfree(string);
1469 break;
1470 case Opt_mountproto:
1471 string = match_strdup(args);
1472 if (string == NULL)
1473 goto out_nomem;
1474 token = match_token(string,
1475 nfs_xprt_protocol_tokens, args);
1476 kfree(string);
1477
1478 mountfamily = AF_INET;
1479 switch (token) {
1480 case Opt_xprt_udp6:
1481 mountfamily = AF_INET6;
1482 case Opt_xprt_udp:
1483 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1484 break;
1485 case Opt_xprt_tcp6:
1486 mountfamily = AF_INET6;
1487 case Opt_xprt_tcp:
1488 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1489 break;
1490 case Opt_xprt_rdma: /* not used for side protocols */
1491 default:
1492 dfprintk(MOUNT, "NFS: unrecognized "
1493 "transport protocol\n");
1494 return 0;
1495 }
1496 break;
1497 case Opt_addr:
1498 string = match_strdup(args);
1499 if (string == NULL)
1500 goto out_nomem;
1501 mnt->nfs_server.addrlen =
1502 rpc_pton(mnt->net, string, strlen(string),
1503 (struct sockaddr *)
1504 &mnt->nfs_server.address,
1505 sizeof(mnt->nfs_server.address));
1506 kfree(string);
1507 if (mnt->nfs_server.addrlen == 0)
1508 goto out_invalid_address;
1509 break;
1510 case Opt_clientaddr:
1511 if (nfs_get_option_str(args, &mnt->client_address))
1512 goto out_nomem;
1513 break;
1514 case Opt_mounthost:
1515 if (nfs_get_option_str(args,
1516 &mnt->mount_server.hostname))
1517 goto out_nomem;
1518 break;
1519 case Opt_mountaddr:
1520 string = match_strdup(args);
1521 if (string == NULL)
1522 goto out_nomem;
1523 mnt->mount_server.addrlen =
1524 rpc_pton(mnt->net, string, strlen(string),
1525 (struct sockaddr *)
1526 &mnt->mount_server.address,
1527 sizeof(mnt->mount_server.address));
1528 kfree(string);
1529 if (mnt->mount_server.addrlen == 0)
1530 goto out_invalid_address;
1531 break;
1532 case Opt_lookupcache:
1533 string = match_strdup(args);
1534 if (string == NULL)
1535 goto out_nomem;
1536 token = match_token(string,
1537 nfs_lookupcache_tokens, args);
1538 kfree(string);
1539 switch (token) {
1540 case Opt_lookupcache_all:
1541 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1542 break;
1543 case Opt_lookupcache_positive:
1544 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1545 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1546 break;
1547 case Opt_lookupcache_none:
1548 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1549 break;
1550 default:
1551 dfprintk(MOUNT, "NFS: invalid "
1552 "lookupcache argument\n");
1553 return 0;
1554 };
1555 break;
1556 case Opt_fscache_uniq:
1557 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1558 goto out_nomem;
1559 mnt->options |= NFS_OPTION_FSCACHE;
1560 break;
1561 case Opt_local_lock:
1562 string = match_strdup(args);
1563 if (string == NULL)
1564 goto out_nomem;
1565 token = match_token(string, nfs_local_lock_tokens,
1566 args);
1567 kfree(string);
1568 switch (token) {
1569 case Opt_local_lock_all:
1570 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1571 NFS_MOUNT_LOCAL_FCNTL);
1572 break;
1573 case Opt_local_lock_flock:
1574 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1575 break;
1576 case Opt_local_lock_posix:
1577 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1578 break;
1579 case Opt_local_lock_none:
1580 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1581 NFS_MOUNT_LOCAL_FCNTL);
1582 break;
1583 default:
1584 dfprintk(MOUNT, "NFS: invalid "
1585 "local_lock argument\n");
1586 return 0;
1587 };
1588 break;
1589
1590 /*
1591 * Special options
1592 */
1593 case Opt_sloppy:
1594 sloppy = 1;
1595 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1596 break;
1597 case Opt_userspace:
1598 case Opt_deprecated:
1599 dfprintk(MOUNT, "NFS: ignoring mount option "
1600 "'%s'\n", p);
1601 break;
1602
1603 default:
1604 invalid_option = 1;
1605 dfprintk(MOUNT, "NFS: unrecognized mount option "
1606 "'%s'\n", p);
1607 }
1608 }
1609
1610 if (!sloppy && invalid_option)
1611 return 0;
1612
1613 if (mnt->minorversion && mnt->version != 4)
1614 goto out_minorversion_mismatch;
1615
1616 if (mnt->options & NFS_OPTION_MIGRATION &&
1617 (mnt->version != 4 || mnt->minorversion != 0))
1618 goto out_migration_misuse;
1619
1620 /*
1621 * verify that any proto=/mountproto= options match the address
1622 * families in the addr=/mountaddr= options.
1623 */
1624 if (protofamily != AF_UNSPEC &&
1625 protofamily != mnt->nfs_server.address.ss_family)
1626 goto out_proto_mismatch;
1627
1628 if (mountfamily != AF_UNSPEC) {
1629 if (mnt->mount_server.addrlen) {
1630 if (mountfamily != mnt->mount_server.address.ss_family)
1631 goto out_mountproto_mismatch;
1632 } else {
1633 if (mountfamily != mnt->nfs_server.address.ss_family)
1634 goto out_mountproto_mismatch;
1635 }
1636 }
1637
1638 return 1;
1639
1640 out_mountproto_mismatch:
1641 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1642 "option\n");
1643 return 0;
1644 out_proto_mismatch:
1645 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1646 return 0;
1647 out_invalid_address:
1648 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1649 return 0;
1650 out_invalid_value:
1651 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1652 return 0;
1653 out_minorversion_mismatch:
1654 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1655 "minorversion=%u\n", mnt->version, mnt->minorversion);
1656 return 0;
1657 out_migration_misuse:
1658 printk(KERN_INFO
1659 "NFS: 'migration' not supported for this NFS version\n");
1660 return 0;
1661 out_nomem:
1662 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1663 return 0;
1664 out_security_failure:
1665 free_secdata(secdata);
1666 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1667 return 0;
1668 }
1669
1670 /*
1671 * Ensure that a specified authtype in args->auth_info is supported by
1672 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1673 * -EACCES if not.
1674 */
1675 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1676 rpc_authflavor_t *server_authlist, unsigned int count)
1677 {
1678 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1679 unsigned int i;
1680
1681 /*
1682 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1683 * must be in the list returned by the server.
1684 *
1685 * AUTH_NULL has a special meaning when it's in the server list - it
1686 * means that the server will ignore the rpc creds, so any flavor
1687 * can be used.
1688 */
1689 for (i = 0; i < count; i++) {
1690 flavor = server_authlist[i];
1691
1692 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1693 flavor == RPC_AUTH_NULL)
1694 goto out;
1695 }
1696
1697 dfprintk(MOUNT,
1698 "NFS: specified auth flavors not supported by server\n");
1699 return -EACCES;
1700
1701 out:
1702 args->selected_flavor = flavor;
1703 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1704 return 0;
1705 }
1706
1707 /*
1708 * Use the remote server's MOUNT service to request the NFS file handle
1709 * corresponding to the provided path.
1710 */
1711 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1712 struct nfs_fh *root_fh,
1713 rpc_authflavor_t *server_authlist,
1714 unsigned int *server_authlist_len)
1715 {
1716 struct nfs_mount_request request = {
1717 .sap = (struct sockaddr *)
1718 &args->mount_server.address,
1719 .dirpath = args->nfs_server.export_path,
1720 .protocol = args->mount_server.protocol,
1721 .fh = root_fh,
1722 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1723 .auth_flav_len = server_authlist_len,
1724 .auth_flavs = server_authlist,
1725 .net = args->net,
1726 };
1727 int status;
1728
1729 if (args->mount_server.version == 0) {
1730 switch (args->version) {
1731 default:
1732 args->mount_server.version = NFS_MNT3_VERSION;
1733 break;
1734 case 2:
1735 args->mount_server.version = NFS_MNT_VERSION;
1736 }
1737 }
1738 request.version = args->mount_server.version;
1739
1740 if (args->mount_server.hostname)
1741 request.hostname = args->mount_server.hostname;
1742 else
1743 request.hostname = args->nfs_server.hostname;
1744
1745 /*
1746 * Construct the mount server's address.
1747 */
1748 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1749 memcpy(request.sap, &args->nfs_server.address,
1750 args->nfs_server.addrlen);
1751 args->mount_server.addrlen = args->nfs_server.addrlen;
1752 }
1753 request.salen = args->mount_server.addrlen;
1754 nfs_set_port(request.sap, &args->mount_server.port, 0);
1755
1756 /*
1757 * Now ask the mount server to map our export path
1758 * to a file handle.
1759 */
1760 status = nfs_mount(&request);
1761 if (status != 0) {
1762 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1763 request.hostname, status);
1764 return status;
1765 }
1766
1767 return 0;
1768 }
1769
1770 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1771 struct nfs_subversion *nfs_mod)
1772 {
1773 int status;
1774 unsigned int i;
1775 bool tried_auth_unix = false;
1776 bool auth_null_in_list = false;
1777 struct nfs_server *server = ERR_PTR(-EACCES);
1778 struct nfs_parsed_mount_data *args = mount_info->parsed;
1779 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1780 unsigned int authlist_len = ARRAY_SIZE(authlist);
1781
1782 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1783 &authlist_len);
1784 if (status)
1785 return ERR_PTR(status);
1786
1787 /*
1788 * Was a sec= authflavor specified in the options? First, verify
1789 * whether the server supports it, and then just try to use it if so.
1790 */
1791 if (args->auth_info.flavor_len > 0) {
1792 status = nfs_verify_authflavors(args, authlist, authlist_len);
1793 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1794 args->selected_flavor);
1795 if (status)
1796 return ERR_PTR(status);
1797 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1798 }
1799
1800 /*
1801 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1802 * SHOULD prefer the flavor listed first. However, some servers list
1803 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1804 */
1805 for (i = 0; i < authlist_len; ++i) {
1806 rpc_authflavor_t flavor;
1807 struct rpcsec_gss_info info;
1808
1809 flavor = authlist[i];
1810 switch (flavor) {
1811 case RPC_AUTH_UNIX:
1812 tried_auth_unix = true;
1813 break;
1814 case RPC_AUTH_NULL:
1815 auth_null_in_list = true;
1816 continue;
1817 default:
1818 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1819 continue;
1820 /* Fallthrough */
1821 }
1822 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1823 args->selected_flavor = flavor;
1824 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1825 if (!IS_ERR(server))
1826 return server;
1827 }
1828
1829 /*
1830 * Nothing we tried so far worked. At this point, give up if we've
1831 * already tried AUTH_UNIX or if the server's list doesn't contain
1832 * AUTH_NULL
1833 */
1834 if (tried_auth_unix || !auth_null_in_list)
1835 return server;
1836
1837 /* Last chance! Try AUTH_UNIX */
1838 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1839 args->selected_flavor = RPC_AUTH_UNIX;
1840 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1841 }
1842
1843 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1844 struct nfs_mount_info *mount_info,
1845 struct nfs_subversion *nfs_mod)
1846 {
1847 struct nfs_server *server;
1848
1849 if (mount_info->parsed->need_mount)
1850 server = nfs_try_mount_request(mount_info, nfs_mod);
1851 else
1852 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1853
1854 if (IS_ERR(server))
1855 return ERR_CAST(server);
1856
1857 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1858 }
1859 EXPORT_SYMBOL_GPL(nfs_try_mount);
1860
1861 /*
1862 * Split "dev_name" into "hostname:export_path".
1863 *
1864 * The leftmost colon demarks the split between the server's hostname
1865 * and the export path. If the hostname starts with a left square
1866 * bracket, then it may contain colons.
1867 *
1868 * Note: caller frees hostname and export path, even on error.
1869 */
1870 static int nfs_parse_devname(const char *dev_name,
1871 char **hostname, size_t maxnamlen,
1872 char **export_path, size_t maxpathlen)
1873 {
1874 size_t len;
1875 char *end;
1876
1877 /* Is the host name protected with square brakcets? */
1878 if (*dev_name == '[') {
1879 end = strchr(++dev_name, ']');
1880 if (end == NULL || end[1] != ':')
1881 goto out_bad_devname;
1882
1883 len = end - dev_name;
1884 end++;
1885 } else {
1886 char *comma;
1887
1888 end = strchr(dev_name, ':');
1889 if (end == NULL)
1890 goto out_bad_devname;
1891 len = end - dev_name;
1892
1893 /* kill possible hostname list: not supported */
1894 comma = strchr(dev_name, ',');
1895 if (comma != NULL && comma < end)
1896 *comma = 0;
1897 }
1898
1899 if (len > maxnamlen)
1900 goto out_hostname;
1901
1902 /* N.B. caller will free nfs_server.hostname in all cases */
1903 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1904 if (*hostname == NULL)
1905 goto out_nomem;
1906 len = strlen(++end);
1907 if (len > maxpathlen)
1908 goto out_path;
1909 *export_path = kstrndup(end, len, GFP_KERNEL);
1910 if (!*export_path)
1911 goto out_nomem;
1912
1913 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1914 return 0;
1915
1916 out_bad_devname:
1917 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1918 return -EINVAL;
1919
1920 out_nomem:
1921 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1922 return -ENOMEM;
1923
1924 out_hostname:
1925 dfprintk(MOUNT, "NFS: server hostname too long\n");
1926 return -ENAMETOOLONG;
1927
1928 out_path:
1929 dfprintk(MOUNT, "NFS: export pathname too long\n");
1930 return -ENAMETOOLONG;
1931 }
1932
1933 /*
1934 * Validate the NFS2/NFS3 mount data
1935 * - fills in the mount root filehandle
1936 *
1937 * For option strings, user space handles the following behaviors:
1938 *
1939 * + DNS: mapping server host name to IP address ("addr=" option)
1940 *
1941 * + failure mode: how to behave if a mount request can't be handled
1942 * immediately ("fg/bg" option)
1943 *
1944 * + retry: how often to retry a mount request ("retry=" option)
1945 *
1946 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1947 * mountproto=tcp after mountproto=udp, and so on
1948 */
1949 static int nfs23_validate_mount_data(void *options,
1950 struct nfs_parsed_mount_data *args,
1951 struct nfs_fh *mntfh,
1952 const char *dev_name)
1953 {
1954 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1955 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1956 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1957
1958 if (data == NULL)
1959 goto out_no_data;
1960
1961 args->version = NFS_DEFAULT_VERSION;
1962 switch (data->version) {
1963 case 1:
1964 data->namlen = 0;
1965 case 2:
1966 data->bsize = 0;
1967 case 3:
1968 if (data->flags & NFS_MOUNT_VER3)
1969 goto out_no_v3;
1970 data->root.size = NFS2_FHSIZE;
1971 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1972 /* Turn off security negotiation */
1973 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1974 case 4:
1975 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1976 goto out_no_sec;
1977 case 5:
1978 memset(data->context, 0, sizeof(data->context));
1979 case 6:
1980 if (data->flags & NFS_MOUNT_VER3) {
1981 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1982 goto out_invalid_fh;
1983 mntfh->size = data->root.size;
1984 args->version = 3;
1985 } else {
1986 mntfh->size = NFS2_FHSIZE;
1987 args->version = 2;
1988 }
1989
1990
1991 memcpy(mntfh->data, data->root.data, mntfh->size);
1992 if (mntfh->size < sizeof(mntfh->data))
1993 memset(mntfh->data + mntfh->size, 0,
1994 sizeof(mntfh->data) - mntfh->size);
1995
1996 /*
1997 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1998 * can deal with.
1999 */
2000 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2001 args->flags |= extra_flags;
2002 args->rsize = data->rsize;
2003 args->wsize = data->wsize;
2004 args->timeo = data->timeo;
2005 args->retrans = data->retrans;
2006 args->acregmin = data->acregmin;
2007 args->acregmax = data->acregmax;
2008 args->acdirmin = data->acdirmin;
2009 args->acdirmax = data->acdirmax;
2010 args->need_mount = false;
2011
2012 memcpy(sap, &data->addr, sizeof(data->addr));
2013 args->nfs_server.addrlen = sizeof(data->addr);
2014 args->nfs_server.port = ntohs(data->addr.sin_port);
2015 if (!nfs_verify_server_address(sap))
2016 goto out_no_address;
2017
2018 if (!(data->flags & NFS_MOUNT_TCP))
2019 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2020 /* N.B. caller will free nfs_server.hostname in all cases */
2021 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2022 args->namlen = data->namlen;
2023 args->bsize = data->bsize;
2024
2025 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2026 args->selected_flavor = data->pseudoflavor;
2027 else
2028 args->selected_flavor = RPC_AUTH_UNIX;
2029 if (!args->nfs_server.hostname)
2030 goto out_nomem;
2031
2032 if (!(data->flags & NFS_MOUNT_NONLM))
2033 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2034 NFS_MOUNT_LOCAL_FCNTL);
2035 else
2036 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2037 NFS_MOUNT_LOCAL_FCNTL);
2038 /*
2039 * The legacy version 6 binary mount data from userspace has a
2040 * field used only to transport selinux information into the
2041 * the kernel. To continue to support that functionality we
2042 * have a touch of selinux knowledge here in the NFS code. The
2043 * userspace code converted context=blah to just blah so we are
2044 * converting back to the full string selinux understands.
2045 */
2046 if (data->context[0]){
2047 #ifdef CONFIG_SECURITY_SELINUX
2048 int rc;
2049 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2050 if (!opts_str)
2051 return -ENOMEM;
2052 strcpy(opts_str, "context=");
2053 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2054 strcat(opts_str, &data->context[0]);
2055 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2056 kfree(opts_str);
2057 if (rc)
2058 return rc;
2059 #else
2060 return -EINVAL;
2061 #endif
2062 }
2063
2064 break;
2065 default:
2066 return NFS_TEXT_DATA;
2067 }
2068
2069 #if !IS_ENABLED(CONFIG_NFS_V3)
2070 if (args->version == 3)
2071 goto out_v3_not_compiled;
2072 #endif /* !CONFIG_NFS_V3 */
2073
2074 return 0;
2075
2076 out_no_data:
2077 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2078 return -EINVAL;
2079
2080 out_no_v3:
2081 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2082 data->version);
2083 return -EINVAL;
2084
2085 out_no_sec:
2086 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2087 return -EINVAL;
2088
2089 #if !IS_ENABLED(CONFIG_NFS_V3)
2090 out_v3_not_compiled:
2091 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2092 return -EPROTONOSUPPORT;
2093 #endif /* !CONFIG_NFS_V3 */
2094
2095 out_nomem:
2096 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2097 return -ENOMEM;
2098
2099 out_no_address:
2100 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2101 return -EINVAL;
2102
2103 out_invalid_fh:
2104 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2105 return -EINVAL;
2106 }
2107
2108 #if IS_ENABLED(CONFIG_NFS_V4)
2109 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2110 void *options,
2111 struct nfs_parsed_mount_data *args,
2112 struct nfs_fh *mntfh,
2113 const char *dev_name)
2114 {
2115 if (fs_type == &nfs_fs_type)
2116 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2117 return nfs4_validate_mount_data(options, args, dev_name);
2118 }
2119 #else
2120 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2121 void *options,
2122 struct nfs_parsed_mount_data *args,
2123 struct nfs_fh *mntfh,
2124 const char *dev_name)
2125 {
2126 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2127 }
2128 #endif
2129
2130 static int nfs_validate_text_mount_data(void *options,
2131 struct nfs_parsed_mount_data *args,
2132 const char *dev_name)
2133 {
2134 int port = 0;
2135 int max_namelen = PAGE_SIZE;
2136 int max_pathlen = NFS_MAXPATHLEN;
2137 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2138
2139 if (nfs_parse_mount_options((char *)options, args) == 0)
2140 return -EINVAL;
2141
2142 if (!nfs_verify_server_address(sap))
2143 goto out_no_address;
2144
2145 if (args->version == 4) {
2146 #if IS_ENABLED(CONFIG_NFS_V4)
2147 port = NFS_PORT;
2148 max_namelen = NFS4_MAXNAMLEN;
2149 max_pathlen = NFS4_MAXPATHLEN;
2150 nfs_validate_transport_protocol(args);
2151 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2152 goto out_invalid_transport_udp;
2153 nfs4_validate_mount_flags(args);
2154 #else
2155 goto out_v4_not_compiled;
2156 #endif /* CONFIG_NFS_V4 */
2157 } else
2158 nfs_set_mount_transport_protocol(args);
2159
2160 nfs_set_port(sap, &args->nfs_server.port, port);
2161
2162 return nfs_parse_devname(dev_name,
2163 &args->nfs_server.hostname,
2164 max_namelen,
2165 &args->nfs_server.export_path,
2166 max_pathlen);
2167
2168 #if !IS_ENABLED(CONFIG_NFS_V4)
2169 out_v4_not_compiled:
2170 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2171 return -EPROTONOSUPPORT;
2172 #else
2173 out_invalid_transport_udp:
2174 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2175 return -EINVAL;
2176 #endif /* !CONFIG_NFS_V4 */
2177
2178 out_no_address:
2179 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2180 return -EINVAL;
2181 }
2182
2183 static int
2184 nfs_compare_remount_data(struct nfs_server *nfss,
2185 struct nfs_parsed_mount_data *data)
2186 {
2187 if (data->flags != nfss->flags ||
2188 data->rsize != nfss->rsize ||
2189 data->wsize != nfss->wsize ||
2190 data->version != nfss->nfs_client->rpc_ops->version ||
2191 data->minorversion != nfss->nfs_client->cl_minorversion ||
2192 data->retrans != nfss->client->cl_timeout->to_retries ||
2193 data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2194 data->acregmin != nfss->acregmin / HZ ||
2195 data->acregmax != nfss->acregmax / HZ ||
2196 data->acdirmin != nfss->acdirmin / HZ ||
2197 data->acdirmax != nfss->acdirmax / HZ ||
2198 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2199 data->nfs_server.port != nfss->port ||
2200 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2201 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2202 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2203 return -EINVAL;
2204
2205 return 0;
2206 }
2207
2208 int
2209 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2210 {
2211 int error;
2212 struct nfs_server *nfss = sb->s_fs_info;
2213 struct nfs_parsed_mount_data *data;
2214 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2215 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2216 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2217
2218 /*
2219 * Userspace mount programs that send binary options generally send
2220 * them populated with default values. We have no way to know which
2221 * ones were explicitly specified. Fall back to legacy behavior and
2222 * just return success.
2223 */
2224 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2225 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2226 options->version <= 6))))
2227 return 0;
2228
2229 data = kzalloc(sizeof(*data), GFP_KERNEL);
2230 if (data == NULL)
2231 return -ENOMEM;
2232
2233 /* fill out struct with values from existing mount */
2234 data->flags = nfss->flags;
2235 data->rsize = nfss->rsize;
2236 data->wsize = nfss->wsize;
2237 data->retrans = nfss->client->cl_timeout->to_retries;
2238 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2239 data->auth_info = nfss->auth_info;
2240 data->acregmin = nfss->acregmin / HZ;
2241 data->acregmax = nfss->acregmax / HZ;
2242 data->acdirmin = nfss->acdirmin / HZ;
2243 data->acdirmax = nfss->acdirmax / HZ;
2244 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2245 data->nfs_server.port = nfss->port;
2246 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2247 data->version = nfsvers;
2248 data->minorversion = nfss->nfs_client->cl_minorversion;
2249 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2250 data->nfs_server.addrlen);
2251
2252 /* overwrite those values with any that were specified */
2253 error = -EINVAL;
2254 if (!nfs_parse_mount_options((char *)options, data))
2255 goto out;
2256
2257 /*
2258 * noac is a special case. It implies -o sync, but that's not
2259 * necessarily reflected in the mtab options. do_remount_sb
2260 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2261 * remount options, so we have to explicitly reset it.
2262 */
2263 if (data->flags & NFS_MOUNT_NOAC)
2264 *flags |= MS_SYNCHRONOUS;
2265
2266 /* compare new mount options with old ones */
2267 error = nfs_compare_remount_data(nfss, data);
2268 out:
2269 kfree(data);
2270 return error;
2271 }
2272 EXPORT_SYMBOL_GPL(nfs_remount);
2273
2274 /*
2275 * Initialise the common bits of the superblock
2276 */
2277 inline void nfs_initialise_sb(struct super_block *sb)
2278 {
2279 struct nfs_server *server = NFS_SB(sb);
2280
2281 sb->s_magic = NFS_SUPER_MAGIC;
2282
2283 /* We probably want something more informative here */
2284 snprintf(sb->s_id, sizeof(sb->s_id),
2285 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2286
2287 if (sb->s_blocksize == 0)
2288 sb->s_blocksize = nfs_block_bits(server->wsize,
2289 &sb->s_blocksize_bits);
2290
2291 sb->s_bdi = &server->backing_dev_info;
2292
2293 nfs_super_set_maxbytes(sb, server->maxfilesize);
2294 }
2295
2296 /*
2297 * Finish setting up an NFS2/3 superblock
2298 */
2299 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2300 {
2301 struct nfs_parsed_mount_data *data = mount_info->parsed;
2302 struct nfs_server *server = NFS_SB(sb);
2303
2304 sb->s_blocksize_bits = 0;
2305 sb->s_blocksize = 0;
2306 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2307 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2308 if (data && data->bsize)
2309 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2310
2311 if (server->nfs_client->rpc_ops->version != 2) {
2312 /* The VFS shouldn't apply the umask to mode bits. We will do
2313 * so ourselves when necessary.
2314 */
2315 sb->s_flags |= MS_POSIXACL;
2316 sb->s_time_gran = 1;
2317 }
2318
2319 nfs_initialise_sb(sb);
2320 }
2321 EXPORT_SYMBOL_GPL(nfs_fill_super);
2322
2323 /*
2324 * Finish setting up a cloned NFS2/3/4 superblock
2325 */
2326 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2327 {
2328 const struct super_block *old_sb = mount_info->cloned->sb;
2329 struct nfs_server *server = NFS_SB(sb);
2330
2331 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2332 sb->s_blocksize = old_sb->s_blocksize;
2333 sb->s_maxbytes = old_sb->s_maxbytes;
2334 sb->s_xattr = old_sb->s_xattr;
2335 sb->s_op = old_sb->s_op;
2336 sb->s_time_gran = 1;
2337
2338 if (server->nfs_client->rpc_ops->version != 2) {
2339 /* The VFS shouldn't apply the umask to mode bits. We will do
2340 * so ourselves when necessary.
2341 */
2342 sb->s_flags |= MS_POSIXACL;
2343 }
2344
2345 nfs_initialise_sb(sb);
2346 }
2347
2348 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2349 | NFS_MOUNT_SECURE \
2350 | NFS_MOUNT_TCP \
2351 | NFS_MOUNT_VER3 \
2352 | NFS_MOUNT_KERBEROS \
2353 | NFS_MOUNT_NONLM \
2354 | NFS_MOUNT_BROKEN_SUID \
2355 | NFS_MOUNT_STRICTLOCK \
2356 | NFS_MOUNT_UNSHARED \
2357 | NFS_MOUNT_NORESVPORT \
2358 | NFS_MOUNT_LEGACY_INTERFACE)
2359
2360 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2361 {
2362 const struct nfs_server *a = s->s_fs_info;
2363 const struct rpc_clnt *clnt_a = a->client;
2364 const struct rpc_clnt *clnt_b = b->client;
2365
2366 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2367 goto Ebusy;
2368 if (a->nfs_client != b->nfs_client)
2369 goto Ebusy;
2370 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2371 goto Ebusy;
2372 if (a->wsize != b->wsize)
2373 goto Ebusy;
2374 if (a->rsize != b->rsize)
2375 goto Ebusy;
2376 if (a->acregmin != b->acregmin)
2377 goto Ebusy;
2378 if (a->acregmax != b->acregmax)
2379 goto Ebusy;
2380 if (a->acdirmin != b->acdirmin)
2381 goto Ebusy;
2382 if (a->acdirmax != b->acdirmax)
2383 goto Ebusy;
2384 if (b->auth_info.flavor_len > 0 &&
2385 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2386 goto Ebusy;
2387 return 1;
2388 Ebusy:
2389 return 0;
2390 }
2391
2392 struct nfs_sb_mountdata {
2393 struct nfs_server *server;
2394 int mntflags;
2395 };
2396
2397 static int nfs_set_super(struct super_block *s, void *data)
2398 {
2399 struct nfs_sb_mountdata *sb_mntdata = data;
2400 struct nfs_server *server = sb_mntdata->server;
2401 int ret;
2402
2403 s->s_flags = sb_mntdata->mntflags;
2404 s->s_fs_info = server;
2405 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2406 ret = set_anon_super(s, server);
2407 if (ret == 0)
2408 server->s_dev = s->s_dev;
2409 return ret;
2410 }
2411
2412 static int nfs_compare_super_address(struct nfs_server *server1,
2413 struct nfs_server *server2)
2414 {
2415 struct sockaddr *sap1, *sap2;
2416
2417 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2418 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2419
2420 if (sap1->sa_family != sap2->sa_family)
2421 return 0;
2422
2423 switch (sap1->sa_family) {
2424 case AF_INET: {
2425 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2426 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2427 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2428 return 0;
2429 if (sin1->sin_port != sin2->sin_port)
2430 return 0;
2431 break;
2432 }
2433 case AF_INET6: {
2434 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2435 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2436 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2437 return 0;
2438 if (sin1->sin6_port != sin2->sin6_port)
2439 return 0;
2440 break;
2441 }
2442 default:
2443 return 0;
2444 }
2445
2446 return 1;
2447 }
2448
2449 static int nfs_compare_super(struct super_block *sb, void *data)
2450 {
2451 struct nfs_sb_mountdata *sb_mntdata = data;
2452 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2453 int mntflags = sb_mntdata->mntflags;
2454
2455 if (!nfs_compare_super_address(old, server))
2456 return 0;
2457 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2458 if (old->flags & NFS_MOUNT_UNSHARED)
2459 return 0;
2460 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2461 return 0;
2462 return nfs_compare_mount_options(sb, server, mntflags);
2463 }
2464
2465 #ifdef CONFIG_NFS_FSCACHE
2466 static void nfs_get_cache_cookie(struct super_block *sb,
2467 struct nfs_parsed_mount_data *parsed,
2468 struct nfs_clone_mount *cloned)
2469 {
2470 struct nfs_server *nfss = NFS_SB(sb);
2471 char *uniq = NULL;
2472 int ulen = 0;
2473
2474 nfss->fscache_key = NULL;
2475 nfss->fscache = NULL;
2476
2477 if (parsed) {
2478 if (!(parsed->options & NFS_OPTION_FSCACHE))
2479 return;
2480 if (parsed->fscache_uniq) {
2481 uniq = parsed->fscache_uniq;
2482 ulen = strlen(parsed->fscache_uniq);
2483 }
2484 } else if (cloned) {
2485 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2486 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2487 return;
2488 if (mnt_s->fscache_key) {
2489 uniq = mnt_s->fscache_key->key.uniquifier;
2490 ulen = mnt_s->fscache_key->key.uniq_len;
2491 };
2492 } else
2493 return;
2494
2495 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2496 }
2497 #else
2498 static void nfs_get_cache_cookie(struct super_block *sb,
2499 struct nfs_parsed_mount_data *parsed,
2500 struct nfs_clone_mount *cloned)
2501 {
2502 }
2503 #endif
2504
2505 static int nfs_bdi_register(struct nfs_server *server)
2506 {
2507 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2508 }
2509
2510 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2511 struct nfs_mount_info *mount_info)
2512 {
2513 int error;
2514 unsigned long kflags = 0, kflags_out = 0;
2515 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2516 kflags |= SECURITY_LSM_NATIVE_LABELS;
2517
2518 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2519 kflags, &kflags_out);
2520 if (error)
2521 goto err;
2522
2523 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2524 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2525 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2526 err:
2527 return error;
2528 }
2529 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2530
2531 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2532 struct nfs_mount_info *mount_info)
2533 {
2534 /* clone any lsm security options from the parent to the new sb */
2535 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2536 return -ESTALE;
2537 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2538 }
2539 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2540
2541 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2542 int flags, const char *dev_name,
2543 struct nfs_mount_info *mount_info,
2544 struct nfs_subversion *nfs_mod)
2545 {
2546 struct super_block *s;
2547 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2548 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2549 struct nfs_sb_mountdata sb_mntdata = {
2550 .mntflags = flags,
2551 .server = server,
2552 };
2553 int error;
2554
2555 if (server->flags & NFS_MOUNT_UNSHARED)
2556 compare_super = NULL;
2557
2558 /* -o noac implies -o sync */
2559 if (server->flags & NFS_MOUNT_NOAC)
2560 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2561
2562 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2563 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2564 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2565
2566 /* Get a superblock - note that we may end up sharing one that already exists */
2567 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2568 if (IS_ERR(s)) {
2569 mntroot = ERR_CAST(s);
2570 goto out_err_nosb;
2571 }
2572
2573 if (s->s_fs_info != server) {
2574 nfs_free_server(server);
2575 server = NULL;
2576 } else {
2577 error = nfs_bdi_register(server);
2578 if (error) {
2579 mntroot = ERR_PTR(error);
2580 goto error_splat_bdi;
2581 }
2582 server->super = s;
2583 }
2584
2585 if (!s->s_root) {
2586 /* initial superblock/root creation */
2587 mount_info->fill_super(s, mount_info);
2588 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2589 }
2590
2591 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2592 if (IS_ERR(mntroot))
2593 goto error_splat_super;
2594
2595 error = mount_info->set_security(s, mntroot, mount_info);
2596 if (error)
2597 goto error_splat_root;
2598
2599 s->s_flags |= MS_ACTIVE;
2600
2601 out:
2602 return mntroot;
2603
2604 out_err_nosb:
2605 nfs_free_server(server);
2606 goto out;
2607
2608 error_splat_root:
2609 dput(mntroot);
2610 mntroot = ERR_PTR(error);
2611 error_splat_super:
2612 if (server && !s->s_root)
2613 bdi_unregister(&server->backing_dev_info);
2614 error_splat_bdi:
2615 deactivate_locked_super(s);
2616 goto out;
2617 }
2618 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2619
2620 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2621 int flags, const char *dev_name, void *raw_data)
2622 {
2623 struct nfs_mount_info mount_info = {
2624 .fill_super = nfs_fill_super,
2625 .set_security = nfs_set_sb_security,
2626 };
2627 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2628 struct nfs_subversion *nfs_mod;
2629 int error;
2630
2631 mount_info.parsed = nfs_alloc_parsed_mount_data();
2632 mount_info.mntfh = nfs_alloc_fhandle();
2633 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2634 goto out;
2635
2636 /* Validate the mount data */
2637 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2638 if (error == NFS_TEXT_DATA)
2639 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2640 if (error < 0) {
2641 mntroot = ERR_PTR(error);
2642 goto out;
2643 }
2644
2645 nfs_mod = get_nfs_version(mount_info.parsed->version);
2646 if (IS_ERR(nfs_mod)) {
2647 mntroot = ERR_CAST(nfs_mod);
2648 goto out;
2649 }
2650
2651 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2652
2653 put_nfs_version(nfs_mod);
2654 out:
2655 nfs_free_parsed_mount_data(mount_info.parsed);
2656 nfs_free_fhandle(mount_info.mntfh);
2657 return mntroot;
2658 }
2659 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2660
2661 /*
2662 * Ensure that we unregister the bdi before kill_anon_super
2663 * releases the device name
2664 */
2665 void nfs_put_super(struct super_block *s)
2666 {
2667 struct nfs_server *server = NFS_SB(s);
2668
2669 bdi_unregister(&server->backing_dev_info);
2670 }
2671 EXPORT_SYMBOL_GPL(nfs_put_super);
2672
2673 /*
2674 * Destroy an NFS2/3 superblock
2675 */
2676 void nfs_kill_super(struct super_block *s)
2677 {
2678 struct nfs_server *server = NFS_SB(s);
2679
2680 kill_anon_super(s);
2681 nfs_fscache_release_super_cookie(s);
2682 nfs_free_server(server);
2683 }
2684 EXPORT_SYMBOL_GPL(nfs_kill_super);
2685
2686 /*
2687 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2688 */
2689 static struct dentry *
2690 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2691 const char *dev_name, void *raw_data)
2692 {
2693 struct nfs_clone_mount *data = raw_data;
2694 struct nfs_mount_info mount_info = {
2695 .fill_super = nfs_clone_super,
2696 .set_security = nfs_clone_sb_security,
2697 .cloned = data,
2698 };
2699 struct nfs_server *server;
2700 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2701 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2702
2703 dprintk("--> nfs_xdev_mount()\n");
2704
2705 mount_info.mntfh = mount_info.cloned->fh;
2706
2707 /* create a new volume representation */
2708 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2709
2710 if (IS_ERR(server))
2711 mntroot = ERR_CAST(server);
2712 else
2713 mntroot = nfs_fs_mount_common(server, flags,
2714 dev_name, &mount_info, nfs_mod);
2715
2716 dprintk("<-- nfs_xdev_mount() = %ld\n",
2717 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2718 return mntroot;
2719 }
2720
2721 #if IS_ENABLED(CONFIG_NFS_V4)
2722
2723 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2724 {
2725 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2726 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2727 }
2728
2729 /*
2730 * Validate NFSv4 mount options
2731 */
2732 static int nfs4_validate_mount_data(void *options,
2733 struct nfs_parsed_mount_data *args,
2734 const char *dev_name)
2735 {
2736 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2737 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2738 char *c;
2739
2740 if (data == NULL)
2741 goto out_no_data;
2742
2743 args->version = 4;
2744
2745 switch (data->version) {
2746 case 1:
2747 if (data->host_addrlen > sizeof(args->nfs_server.address))
2748 goto out_no_address;
2749 if (data->host_addrlen == 0)
2750 goto out_no_address;
2751 args->nfs_server.addrlen = data->host_addrlen;
2752 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2753 return -EFAULT;
2754 if (!nfs_verify_server_address(sap))
2755 goto out_no_address;
2756 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2757
2758 if (data->auth_flavourlen) {
2759 rpc_authflavor_t pseudoflavor;
2760 if (data->auth_flavourlen > 1)
2761 goto out_inval_auth;
2762 if (copy_from_user(&pseudoflavor,
2763 data->auth_flavours,
2764 sizeof(pseudoflavor)))
2765 return -EFAULT;
2766 args->selected_flavor = pseudoflavor;
2767 } else
2768 args->selected_flavor = RPC_AUTH_UNIX;
2769
2770 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2771 if (IS_ERR(c))
2772 return PTR_ERR(c);
2773 args->nfs_server.hostname = c;
2774
2775 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2776 if (IS_ERR(c))
2777 return PTR_ERR(c);
2778 args->nfs_server.export_path = c;
2779 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2780
2781 c = strndup_user(data->client_addr.data, 16);
2782 if (IS_ERR(c))
2783 return PTR_ERR(c);
2784 args->client_address = c;
2785
2786 /*
2787 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2788 * can deal with.
2789 */
2790
2791 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2792 args->rsize = data->rsize;
2793 args->wsize = data->wsize;
2794 args->timeo = data->timeo;
2795 args->retrans = data->retrans;
2796 args->acregmin = data->acregmin;
2797 args->acregmax = data->acregmax;
2798 args->acdirmin = data->acdirmin;
2799 args->acdirmax = data->acdirmax;
2800 args->nfs_server.protocol = data->proto;
2801 nfs_validate_transport_protocol(args);
2802 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2803 goto out_invalid_transport_udp;
2804
2805 break;
2806 default:
2807 return NFS_TEXT_DATA;
2808 }
2809
2810 return 0;
2811
2812 out_no_data:
2813 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2814 return -EINVAL;
2815
2816 out_inval_auth:
2817 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2818 data->auth_flavourlen);
2819 return -EINVAL;
2820
2821 out_no_address:
2822 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2823 return -EINVAL;
2824
2825 out_invalid_transport_udp:
2826 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2827 return -EINVAL;
2828 }
2829
2830 /*
2831 * NFS v4 module parameters need to stay in the
2832 * NFS client for backwards compatibility
2833 */
2834 unsigned int nfs_callback_set_tcpport;
2835 unsigned short nfs_callback_tcpport;
2836 /* Default cache timeout is 10 minutes */
2837 unsigned int nfs_idmap_cache_timeout = 600;
2838 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2839 bool nfs4_disable_idmapping = true;
2840 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2841 unsigned short send_implementation_id = 1;
2842 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2843 bool recover_lost_locks = false;
2844
2845 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2846 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2847 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2848 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2849 EXPORT_SYMBOL_GPL(max_session_slots);
2850 EXPORT_SYMBOL_GPL(send_implementation_id);
2851 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2852 EXPORT_SYMBOL_GPL(recover_lost_locks);
2853
2854 #define NFS_CALLBACK_MAXPORTNR (65535U)
2855
2856 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2857 {
2858 unsigned long num;
2859 int ret;
2860
2861 if (!val)
2862 return -EINVAL;
2863 ret = kstrtoul(val, 0, &num);
2864 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2865 return -EINVAL;
2866 *((unsigned int *)kp->arg) = num;
2867 return 0;
2868 }
2869 static struct kernel_param_ops param_ops_portnr = {
2870 .set = param_set_portnr,
2871 .get = param_get_uint,
2872 };
2873 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2874
2875 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2876 module_param(nfs_idmap_cache_timeout, int, 0644);
2877 module_param(nfs4_disable_idmapping, bool, 0644);
2878 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2879 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2880 MODULE_PARM_DESC(nfs4_disable_idmapping,
2881 "Turn off NFSv4 idmapping when using 'sec=sys'");
2882 module_param(max_session_slots, ushort, 0644);
2883 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2884 "requests the client will negotiate");
2885 module_param(send_implementation_id, ushort, 0644);
2886 MODULE_PARM_DESC(send_implementation_id,
2887 "Send implementation ID with NFSv4.1 exchange_id");
2888 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2889
2890 module_param(recover_lost_locks, bool, 0644);
2891 MODULE_PARM_DESC(recover_lost_locks,
2892 "If the server reports that a lock might be lost, "
2893 "try to recover it risking data corruption.");
2894
2895
2896 #endif /* CONFIG_NFS_V4 */
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